nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 enum pam_winbind_request_type
  16 {
  17         PAM_WINBIND_AUTHENTICATE,
  18         PAM_WINBIND_SETCRED,
  19         PAM_WINBIND_ACCT_MGMT,
  20         PAM_WINBIND_OPEN_SESSION,
  21         PAM_WINBIND_CLOSE_SESSION,
  22         PAM_WINBIND_CHAUTHTOK,
  23         PAM_WINBIND_CLEANUP
  24 };
  25
  26 static int wbc_error_to_pam_error(wbcErr status)
  27 {
  28         switch (status) {
  29                 case WBC_ERR_SUCCESS:
  30                         return PAM_SUCCESS;
  31                 case WBC_ERR_NOT_IMPLEMENTED:
  32                         return PAM_SERVICE_ERR;
  33                 case WBC_ERR_UNKNOWN_FAILURE:
  34                         break;
  35                 case WBC_ERR_NO_MEMORY:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_INVALID_SID:
  38                 case WBC_ERR_INVALID_PARAM:
  39                         break;
  40                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  41                         return PAM_AUTHINFO_UNAVAIL;
  42                 case WBC_ERR_DOMAIN_NOT_FOUND:
  43                 case WBC_ERR_NOT_MAPPED:
  44                         return PAM_AUTHINFO_UNAVAIL;
  45                 case WBC_ERR_INVALID_RESPONSE:
  46                         return PAM_BUF_ERR;
  47                 case WBC_ERR_NSS_ERROR:
  48                         return PAM_USER_UNKNOWN;
  49                 case WBC_ERR_AUTH_ERROR:
  50                         return PAM_AUTH_ERR;
  51                 case WBC_ERR_UNKNOWN_USER:
  52                         return PAM_USER_UNKNOWN;
  53                 case WBC_ERR_UNKNOWN_GROUP:
  54                         return PAM_USER_UNKNOWN;
  55                 case WBC_ERR_PWD_CHANGE_FAILED:
  56                         break;
  57         }
  58
  59         /* be paranoid */
  60         return PAM_AUTH_ERR;
  61 }
  62
  63 static const char *_pam_error_code_str(int err)
  64 {
  65         switch (err) {
  66                 case PAM_SUCCESS:
  67                         return "PAM_SUCCESS";
  68                 case PAM_OPEN_ERR:
  69                         return "PAM_OPEN_ERR";
  70                 case PAM_SYMBOL_ERR:
  71                         return "PAM_SYMBOL_ERR";
  72                 case PAM_SERVICE_ERR:
  73                         return "PAM_SERVICE_ERR";
  74                 case PAM_SYSTEM_ERR:
  75                         return "PAM_SYSTEM_ERR";
  76                 case PAM_BUF_ERR:
  77                         return "PAM_BUF_ERR";
  78                 case PAM_PERM_DENIED:
  79                         return "PAM_PERM_DENIED";
  80                 case PAM_AUTH_ERR:
  81                         return "PAM_AUTH_ERR";
  82                 case PAM_CRED_INSUFFICIENT:
  83                         return "PAM_CRED_INSUFFICIENT";
  84                 case PAM_AUTHINFO_UNAVAIL:
  85                         return "PAM_AUTHINFO_UNAVAIL";
  86                 case PAM_USER_UNKNOWN:
  87                         return "PAM_USER_UNKNOWN";
  88                 case PAM_MAXTRIES:
  89                         return "PAM_MAXTRIES";
  90                 case PAM_NEW_AUTHTOK_REQD:
  91                         return "PAM_NEW_AUTHTOK_REQD";
  92                 case PAM_ACCT_EXPIRED:
  93                         return "PAM_ACCT_EXPIRED";
  94                 case PAM_SESSION_ERR:
  95                         return "PAM_SESSION_ERR";
  96                 case PAM_CRED_UNAVAIL:
  97                         return "PAM_CRED_UNAVAIL";
  98                 case PAM_CRED_EXPIRED:
  99                         return "PAM_CRED_EXPIRED";
 100                 case PAM_CRED_ERR:
 101                         return "PAM_CRED_ERR";
 102                 case PAM_NO_MODULE_DATA:
 103                         return "PAM_NO_MODULE_DATA";
 104                 case PAM_CONV_ERR:
 105                         return "PAM_CONV_ERR";
 106                 case PAM_AUTHTOK_ERR:
 107                         return "PAM_AUTHTOK_ERR";
 108                 case PAM_AUTHTOK_RECOVER_ERR:
 109                         return "PAM_AUTHTOK_RECOVER_ERR";
 110                 case PAM_AUTHTOK_LOCK_BUSY:
 111                         return "PAM_AUTHTOK_LOCK_BUSY";
 112                 case PAM_AUTHTOK_DISABLE_AGING:
 113                         return "PAM_AUTHTOK_DISABLE_AGING";
 114                 case PAM_TRY_AGAIN:
 115                         return "PAM_TRY_AGAIN";
 116                 case PAM_IGNORE:
 117                         return "PAM_IGNORE";
 118                 case PAM_ABORT:
 119                         return "PAM_ABORT";
 120                 case PAM_AUTHTOK_EXPIRED:
 121                         return "PAM_AUTHTOK_EXPIRED";
 122 #ifdef PAM_MODULE_UNKNOWN
 123                 case PAM_MODULE_UNKNOWN:
 124                         return "PAM_MODULE_UNKNOWN";
 125 #endif
 126 #ifdef PAM_BAD_ITEM
 127                 case PAM_BAD_ITEM:
 128                         return "PAM_BAD_ITEM";
 129 #endif
 130 #ifdef PAM_CONV_AGAIN
 131                 case PAM_CONV_AGAIN:
 132                         return "PAM_CONV_AGAIN";
 133 #endif
 134 #ifdef PAM_INCOMPLETE
 135                 case PAM_INCOMPLETE:
 136                         return "PAM_INCOMPLETE";
 137 #endif
 138                 default:
 139                         return NULL;
 140         }
 141 }
 142
 143 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 144         do { \
 145                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 146                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 147                 _pam_log_state(ctx); \
 148         } while (0)
 149
 150 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 151         do { \
 152                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 153                                function " returning %d (%s)", ctx ? ctx->pamh : NULL, retval, \
 154                                _pam_error_code_str(retval)); \
 155                 _pam_log_state(ctx); \
 156         } while (0)
 157
 158 /* data tokens */
 159
 160 #define MAX_PASSWD_TRIES        3
 161
 162 #ifdef HAVE_GETTEXT
 163 static char initialized = 0;
 164
 165 static inline void textdomain_init(void);
 166 static inline void textdomain_init(void)
 167 {
 168         if (!initialized) {
 169                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 170                 initialized = 1;
 171         }
 172         return;
 173 }
 174 #endif
 175
 176
 177 /* some syslogging */
 178 static void _pam_log_int(const pam_handle_t *pamh,
 179                          int err,
 180                          const char *format,
 181                          va_list args) PRINTF_ATTRIBUTE(3, 0);
 182
 183 #ifdef HAVE_PAM_VSYSLOG
 184 static void _pam_log_int(const pam_handle_t *pamh,
 185                          int err,
 186                          const char *format,
 187                          va_list args)
 188 {
 189         pam_vsyslog(pamh, err, format, args);
 190 }
 191 #else
 192 static void _pam_log_int(const pam_handle_t *pamh,
 193                          int err,
 194                          const char *format,
 195                          va_list args)
 196 {
 197         char *base = NULL;
 198         va_list args2;
 199         const char *service;
 200         int ret;
 201
 202         va_copy(args2, args);
 203
 204         pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
 205
 206         ret = vasprintf(&base, format, args);
 207         if (ret == -1) {
 208                 /* what else todo ? */
 209                 vsyslog(err, format, args2);
 210                 va_end(args2);
 211                 return;
 212         }
 213
 214         syslog(err, "%s(%s): %s", MODULE_NAME, service, base);
 215         SAFE_FREE(base);
 216         va_end(args2);
 217 }
 218 #endif /* HAVE_PAM_VSYSLOG */
 219
 220 static bool _pam_log_is_silent(int ctrl)
 221 {
 222         return on(ctrl, WINBIND_SILENT);
 223 }
 224
 225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 226 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 227 {
 228         va_list args;
 229
 230         if (_pam_log_is_silent(r->ctrl)) {
 231                 return;
 232         }
 233
 234         va_start(args, format);
 235         _pam_log_int(r->pamh, err, format, args);
 236         va_end(args);
 237 }
 238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 239 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 240 {
 241         va_list args;
 242
 243         if (_pam_log_is_silent(ctrl)) {
 244                 return;
 245         }
 246
 247         va_start(args, format);
 248         _pam_log_int(pamh, err, format, args);
 249         va_end(args);
 250 }
 251
 252 static bool _pam_log_is_debug_enabled(int ctrl)
 253 {
 254         if (ctrl == -1) {
 255                 return false;
 256         }
 257
 258         if (_pam_log_is_silent(ctrl)) {
 259                 return false;
 260         }
 261
 262         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 263                 return false;
 264         }
 265
 266         return true;
 267 }
 268
 269 static bool _pam_log_is_debug_state_enabled(int ctrl)
 270 {
 271         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 272                 return false;
 273         }
 274
 275         return _pam_log_is_debug_enabled(ctrl);
 276 }
 277
 278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 279 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 280 {
 281         va_list args;
 282
 283         if (!r || !_pam_log_is_debug_enabled(r->ctrl)) {
 284                 return;
 285         }
 286
 287         va_start(args, format);
 288         _pam_log_int(r->pamh, err, format, args);
 289         va_end(args);
 290 }
 291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 292 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 293 {
 294         va_list args;
 295
 296         if (!_pam_log_is_debug_enabled(ctrl)) {
 297                 return;
 298         }
 299
 300         va_start(args, format);
 301         _pam_log_int(pamh, err, format, args);
 302         va_end(args);
 303 }
 304
 305 static void _pam_log_state_datum(struct pwb_context *ctx,
 306                                  int item_type,
 307                                  const char *key,
 308                                  int is_string)
 309 {
 310         const void *data = NULL;
 311         if (item_type != 0) {
 312                 pam_get_item(ctx->pamh, item_type, &data);
 313         } else {
 314                 pam_get_data(ctx->pamh, key, &data);
 315         }
 316         if (data != NULL) {
 317                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 318                 if (is_string != 0) {
 319                         _pam_log_debug(ctx, LOG_DEBUG,
 320                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 321                                        ctx->pamh, type, key, (const char *)data,
 322                                        data);
 323                 } else {
 324                         _pam_log_debug(ctx, LOG_DEBUG,
 325                                        "[pamh: %p] STATE: %s(%s) = %p",
 326                                        ctx->pamh, type, key, data);
 327                 }
 328         }
 329 }
 330
 331 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 332         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 333
 334 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 335         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 336
 337 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 338         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 339
 340 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 341         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 342
 343 #ifdef DEBUG_PASSWORD
 344 #define _LOG_PASSWORD_AS_STRING 1
 345 #else
 346 #define _LOG_PASSWORD_AS_STRING 0
 347 #endif
 348
 349 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 350         _pam_log_state_datum(ctx, item_type, #item_type, \
 351                              _LOG_PASSWORD_AS_STRING)
 352 /*
 353  * wrapper to preserve old behaviour of iniparser which ignored
 354  * key values that had no value assigned like
 355  *    key =
 356  * for a key like above newer iniparser will return a zero-length
 357  * string, previously iniparser would return NULL
 358  *
 359  * JRA: For compatibility, tiniparser behaves like iniparser.
 360  */
 361 static const char *tiniparser_getstring_nonempty(struct tiniparser_dictionary *d,
 362                         const char *key,
 363                         const char *def)
 364 {
 365         const char *ret = tiniparser_getstring(d, key, def);
 366         if (ret && strlen(ret) == 0) {
 367                 ret = NULL;
 368         }
 369         return ret;
 370 }
 371
 372 static void _pam_log_state(struct pwb_context *ctx)
 373 {
 374         if (!ctx || !_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 375                 return;
 376         }
 377
 378         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 379         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 380         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 381         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 382         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 383         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 384         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 385         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 386         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 387 #ifdef PAM_FAIL_DELAY
 388         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 389 #endif
 390 #ifdef PAM_REPOSITORY
 391         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 392 #endif
 393
 394         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 395         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 396         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 397         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 398         _PAM_LOG_STATE_DATA_STRING(ctx,
 399                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 400                                    /* Use atoi to get PAM result code */
 401         _PAM_LOG_STATE_DATA_STRING(ctx,
 402                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 403         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 404 }
 405
 406 static int _pam_parse(const pam_handle_t *pamh,
 407                       int flags,
 408                       int argc,
 409                       const char **argv,
 410                       enum pam_winbind_request_type type,
 411                       struct tiniparser_dictionary **result_d)
 412 {
 413         int ctrl = 0;
 414         const char *config_file = NULL;
 415         int i;
 416         const char **v;
 417         struct tiniparser_dictionary *d = NULL;
 418
 419         if (flags & PAM_SILENT) {
 420                 ctrl |= WINBIND_SILENT;
 421         }
 422
 423         for (i=argc,v=argv; i-- > 0; ++v) {
 424                 if (!strncasecmp(*v, "config", strlen("config"))) {
 425                         ctrl |= WINBIND_CONFIG_FILE;
 426                         config_file = v[i];
 427                         break;
 428                 }
 429         }
 430
 431         if (config_file == NULL) {
 432                 config_file = PAM_WINBIND_CONFIG_FILE;
 433         }
 434
 435         d = tiniparser_load(config_file);
 436         if (d == NULL) {
 437                 goto config_from_pam;
 438         }
 439
 440         if (tiniparser_getboolean(d, "global:debug", false)) {
 441                 ctrl |= WINBIND_DEBUG_ARG;
 442         }
 443
 444         if (tiniparser_getboolean(d, "global:debug_state", false)) {
 445                 ctrl |= WINBIND_DEBUG_STATE;
 446         }
 447
 448         if (tiniparser_getboolean(d, "global:cached_login", false)) {
 449                 ctrl |= WINBIND_CACHED_LOGIN;
 450         }
 451
 452         if (tiniparser_getboolean(d, "global:krb5_auth", false)) {
 453                 ctrl |= WINBIND_KRB5_AUTH;
 454         }
 455
 456         if (tiniparser_getboolean(d, "global:silent", false)) {
 457                 ctrl |= WINBIND_SILENT;
 458         }
 459
 460         if (tiniparser_getstring_nonempty(d, "global:krb5_ccache_type", NULL) != NULL) {
 461                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 462         }
 463
 464         if ((tiniparser_getstring_nonempty(d, "global:require-membership-of", NULL)
 465              != NULL) ||
 466             (tiniparser_getstring_nonempty(d, "global:require_membership_of", NULL)
 467              != NULL)) {
 468                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 469         }
 470
 471         if (tiniparser_getboolean(d, "global:try_first_pass", false)) {
 472                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 473         }
 474
 475         if (tiniparser_getint(d, "global:warn_pwd_expire", 0)) {
 476                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 477         }
 478
 479         if (tiniparser_getboolean(d, "global:mkhomedir", false)) {
 480                 ctrl |= WINBIND_MKHOMEDIR;
 481         }
 482
 483         if (tiniparser_getboolean(d, "global:pwd_change_prompt", false)) {
 484                 ctrl |= WINBIND_PWD_CHANGE_PROMPT;
 485         }
 486
 487 config_from_pam:
 488         /* step through arguments */
 489         for (i=argc,v=argv; i-- > 0; ++v) {
 490
 491                 /* generic options */
 492                 if (!strcmp(*v,"debug"))
 493                         ctrl |= WINBIND_DEBUG_ARG;
 494                 else if (!strcasecmp(*v, "debug_state"))
 495                         ctrl |= WINBIND_DEBUG_STATE;
 496                 else if (!strcasecmp(*v, "silent"))
 497                         ctrl |= WINBIND_SILENT;
 498                 else if (!strcasecmp(*v, "use_authtok"))
 499                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 500                 else if (!strcasecmp(*v, "try_authtok"))
 501                         ctrl |= WINBIND_TRY_AUTHTOK_ARG;
 502                 else if (!strcasecmp(*v, "use_first_pass"))
 503                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 504                 else if (!strcasecmp(*v, "try_first_pass"))
 505                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 506                 else if (!strcasecmp(*v, "unknown_ok"))
 507                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 508                 else if ((type == PAM_WINBIND_AUTHENTICATE
 509                           || type == PAM_WINBIND_SETCRED)
 510                          && !strncasecmp(*v, "require_membership_of",
 511                                          strlen("require_membership_of")))
 512                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 513                 else if ((type == PAM_WINBIND_AUTHENTICATE
 514                           || type == PAM_WINBIND_SETCRED)
 515                          && !strncasecmp(*v, "require-membership-of",
 516                                          strlen("require-membership-of")))
 517                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 518                 else if (!strcasecmp(*v, "krb5_auth"))
 519                         ctrl |= WINBIND_KRB5_AUTH;
 520                 else if (!strncasecmp(*v, "krb5_ccache_type",
 521                                       strlen("krb5_ccache_type")))
 522                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 523                 else if (!strcasecmp(*v, "cached_login"))
 524                         ctrl |= WINBIND_CACHED_LOGIN;
 525                 else if (!strcasecmp(*v, "mkhomedir"))
 526                         ctrl |= WINBIND_MKHOMEDIR;
 527                 else if (!strncasecmp(*v, "warn_pwd_expire",
 528                         strlen("warn_pwd_expire")))
 529                         ctrl |= WINBIND_WARN_PWD_EXPIRE;
 530                 else if (!strcasecmp(*v, "pwd_change_prompt"))
 531                         ctrl |= WINBIND_PWD_CHANGE_PROMPT;
 532                 else if (type != PAM_WINBIND_CLEANUP) {
 533                         __pam_log(pamh, ctrl, LOG_ERR,
 534                                  "pam_parse: unknown option: %s", *v);
 535                         return -1;
 536                 }
 537
 538         }
 539
 540         if (result_d) {
 541                 *result_d = d;
 542         } else {
 543                 if (d) {
 544                         tiniparser_freedict(d);
 545                 }
 546         }
 547
 548         return ctrl;
 549 };
 550
 551 static int _pam_winbind_free_context(struct pwb_context *ctx)
 552 {
 553         if (!ctx) {
 554                 return 0;
 555         }
 556
 557         if (ctx->dict) {
 558                 tiniparser_freedict(ctx->dict);
 559         }
 560
 561         wbcCtxFree(ctx->wbc_ctx);
 562
 563         return 0;
 564 }
 565
 566 static int _pam_winbind_init_context(pam_handle_t *pamh,
 567                                      int flags,
 568                                      int argc,
 569                                      const char **argv,
 570                                      enum pam_winbind_request_type type,
 571                                      struct pwb_context **ctx_p)
 572 {
 573         struct pwb_context *r = NULL;
 574         const char *service = NULL;
 575         char service_name[32] = {0};
 576         int ctrl_code;
 577
 578 #ifdef HAVE_GETTEXT
 579         textdomain_init();
 580 #endif
 581
 582         r = talloc_zero(NULL, struct pwb_context);
 583         if (!r) {
 584                 return PAM_BUF_ERR;
 585         }
 586
 587         talloc_set_destructor(r, _pam_winbind_free_context);
 588
 589         r->pamh = pamh;
 590         r->flags = flags;
 591         r->argc = argc;
 592         r->argv = argv;
 593         ctrl_code = _pam_parse(pamh, flags, argc, argv, type, &r->dict);
 594         if (ctrl_code == -1) {
 595                 TALLOC_FREE(r);
 596                 return PAM_SYSTEM_ERR;
 597         }
 598         r->ctrl = ctrl_code;
 599
 600         r->wbc_ctx = wbcCtxCreate();
 601         if (r->wbc_ctx == NULL) {
 602                 TALLOC_FREE(r);
 603                 return PAM_SYSTEM_ERR;
 604         }
 605
 606         pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
 607
 608         snprintf(service_name, sizeof(service_name), "PAM_WINBIND[%s]", service);
 609
 610         wbcSetClientProcessName(service_name);
 611
 612         *ctx_p = r;
 613
 614         return PAM_SUCCESS;
 615 }
 616
 617 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 618                                       void *data,
 619                                       int error_status)
 620 {
 621         int ctrl = _pam_parse(pamh, 0, 0, NULL, PAM_WINBIND_CLEANUP, NULL);
 622         if (_pam_log_is_debug_state_enabled(ctrl)) {
 623                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 624                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 625                                "(error_status = %d)", pamh, data,
 626                                error_status);
 627         }
 628         TALLOC_FREE(data);
 629 }
 630
 631
 632 static const struct ntstatus_errors {
 633         const char *ntstatus_string;
 634         const char *error_string;
 635 } ntstatus_errors[] = {
 636         {"NT_STATUS_OK",
 637                 N_("Success")},
 638         {"NT_STATUS_BACKUP_CONTROLLER",
 639                 N_("No primary Domain Controller available")},
 640         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 641                 N_("No domain controllers found")},
 642         {"NT_STATUS_NO_LOGON_SERVERS",
 643                 N_("No logon servers")},
 644         {"NT_STATUS_PWD_TOO_SHORT",
 645                 N_("Password too short")},
 646         {"NT_STATUS_PWD_TOO_RECENT",
 647                 N_("The password was recently changed and cannot be changed again before %s")},
 648         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 649                 N_("Password is already in password history")},
 650         {"NT_STATUS_PASSWORD_EXPIRED",
 651                 N_("Your password has expired")},
 652         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 653                 N_("You need to change your password now")},
 654         {"NT_STATUS_INVALID_WORKSTATION",
 655                 N_("You are not allowed to logon from this workstation")},
 656         {"NT_STATUS_INVALID_LOGON_HOURS",
 657                 N_("You are not allowed to logon at this time")},
 658         {"NT_STATUS_ACCOUNT_EXPIRED",
 659                 N_("Your account has expired. "
 660                    "Please contact your System administrator")}, /* SCNR */
 661         {"NT_STATUS_ACCOUNT_DISABLED",
 662                 N_("Your account is disabled. "
 663                    "Please contact your System administrator")}, /* SCNR */
 664         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 665                 N_("Your account has been locked. "
 666                    "Please contact your System administrator")}, /* SCNR */
 667         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 668                 N_("Invalid Trust Account")},
 669         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 670                 N_("Invalid Trust Account")},
 671         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 672                 N_("Invalid Trust Account")},
 673         {"NT_STATUS_ACCESS_DENIED",
 674                 N_("Access is denied")},
 675         {NULL, NULL}
 676 };
 677
 678 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 679 {
 680         int i;
 681         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 682                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 683                                 nt_status_string)) {
 684                         return _(ntstatus_errors[i].error_string);
 685                 }
 686         }
 687         return NULL;
 688 }
 689
 690 /* --- authentication management functions --- */
 691
 692 /* Attempt a conversation */
 693
 694 static int converse(const pam_handle_t *pamh,
 695                     int nargs,
 696                     const struct pam_message **message,
 697                     struct pam_response **response)
 698 {
 699         int retval;
 700         const struct pam_conv *conv;
 701
 702         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 703         if (retval == PAM_SUCCESS) {
 704                 retval = conv->conv(nargs,
 705                                     discard_const_p(const struct pam_message *, message),
 706                                     response, conv->appdata_ptr);
 707         }
 708
 709         return retval; /* propagate error status */
 710 }
 711
 712
 713 static int _make_remark(struct pwb_context *ctx,
 714                         int type,
 715                         const char *text)
 716 {
 717         int retval = PAM_SUCCESS;
 718
 719         const struct pam_message *pmsg[1];
 720         struct pam_message msg[1];
 721         struct pam_response *resp;
 722
 723         if (ctx->flags & WINBIND_SILENT) {
 724                 return PAM_SUCCESS;
 725         }
 726
 727         pmsg[0] = &msg[0];
 728         msg[0].msg = discard_const_p(char, text);
 729         msg[0].msg_style = type;
 730
 731         resp = NULL;
 732         retval = converse(ctx->pamh, 1, pmsg, &resp);
 733
 734         if (resp) {
 735                 _pam_drop_reply(resp, 1);
 736         }
 737         return retval;
 738 }
 739
 740 static int _make_remark_v(struct pwb_context *ctx,
 741                           int type,
 742                           const char *format,
 743                           va_list args) PRINTF_ATTRIBUTE(3, 0);
 744
 745 static int _make_remark_v(struct pwb_context *ctx,
 746                           int type,
 747                           const char *format,
 748                           va_list args)
 749 {
 750         char *var;
 751         int ret;
 752
 753         ret = vasprintf(&var, format, args);
 754         if (ret < 0) {
 755                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 756                 return ret;
 757         }
 758
 759         ret = _make_remark(ctx, type, var);
 760         SAFE_FREE(var);
 761         return ret;
 762 }
 763
 764 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 765 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 766 {
 767         int ret;
 768         va_list args;
 769
 770         va_start(args, format);
 771         ret = _make_remark_v(ctx, type, format, args);
 772         va_end(args);
 773         return ret;
 774 }
 775
 776 static int pam_winbind_request_log(struct pwb_context *ctx,
 777                                    int retval,
 778                                    const char *user,
 779                                    const char *fn)
 780 {
 781         switch (retval) {
 782         case PAM_AUTH_ERR:
 783                 /* incorrect password */
 784                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 785                          "(incorrect password or invalid membership)", user);
 786                 return retval;
 787         case PAM_ACCT_EXPIRED:
 788                 /* account expired */
 789                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 790                          user);
 791                 return retval;
 792         case PAM_AUTHTOK_EXPIRED:
 793                 /* password expired */
 794                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 795                          user);
 796                 return retval;
 797         case PAM_NEW_AUTHTOK_REQD:
 798                 /* new password required */
 799                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 800                          "required", user);
 801                 return retval;
 802         case PAM_USER_UNKNOWN:
 803                 /* the user does not exist */
 804                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 805                                user);
 806                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 807                         return PAM_IGNORE;
 808                 }
 809                 return retval;
 810         case PAM_AUTHTOK_ERR:
 811                 /* Authentication token manipulation error */
 812                 _pam_log(ctx, LOG_WARNING, "user `%s' authentication token change failed "
 813                         "(pwd complexity/history/min_age not met?)", user);
 814                 return retval;
 815         case PAM_SUCCESS:
 816                 /* Otherwise, the authentication looked good */
 817                 if (strcmp(fn, "wbcLogonUser") == 0) {
 818                         _pam_log(ctx, LOG_NOTICE,
 819                                  "user '%s' granted access", user);
 820                 } else {
 821                         _pam_log(ctx, LOG_NOTICE,
 822                                  "user '%s' OK", user);
 823                 }
 824                 return retval;
 825         default:
 826                 /* we don't know anything about this return value */
 827                 _pam_log(ctx, LOG_ERR,
 828                          "internal module error (retval = %s(%d), user = '%s')",
 829                         _pam_error_code_str(retval), retval, user);
 830                 return retval;
 831         }
 832 }
 833
 834 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 835                                        struct wbcAuthErrorInfo *e,
 836                                        wbcErr status,
 837                                        const char *username,
 838                                        const char *fn)
 839 {
 840         int ret = PAM_AUTH_ERR;
 841
 842         if (WBC_ERROR_IS_OK(status)) {
 843                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 844                         fn);
 845                 ret = PAM_SUCCESS;
 846                 return pam_winbind_request_log(ctx, ret, username, fn);
 847         }
 848
 849         if (e) {
 850                 if (e->pam_error != PAM_SUCCESS) {
 851                         _pam_log(ctx, LOG_ERR,
 852                                  "request %s failed: %s, "
 853                                  "PAM error: %s (%d), NTSTATUS: %s, "
 854                                  "Error message was: %s",
 855                                  fn,
 856                                  wbcErrorString(status),
 857                                  _pam_error_code_str(e->pam_error),
 858                                  e->pam_error,
 859                                  e->nt_string,
 860                                  e->display_string);
 861                         ret = e->pam_error;
 862                         return pam_winbind_request_log(ctx, ret, username, fn);
 863                 }
 864
 865                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 866
 867                 ret = PAM_SERVICE_ERR;
 868                 return pam_winbind_request_log(ctx, ret, username, fn);
 869         }
 870
 871         ret = wbc_error_to_pam_error(status);
 872         _pam_log(ctx, LOG_ERR,
 873                  "request %s failed: %s, PAM error: %s (%d)!",
 874                  fn, wbcErrorString(status),
 875                  _pam_error_code_str(ret), ret);
 876         return pam_winbind_request_log(ctx, ret, username, fn);
 877 }
 878
 879 #if defined(HAVE_PAM_RADIO_TYPE)
 880 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 881 {
 882         struct pam_message msg;
 883         const struct pam_message *pmsg;
 884         struct pam_response *resp = NULL;
 885         int ret;
 886         bool retval = false;
 887         pmsg = &msg;
 888         msg.msg_style = PAM_RADIO_TYPE;
 889         msg.msg = _("Do you want to change your password now?");
 890         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 891         if (resp == NULL) {
 892                 if (ret == PAM_SUCCESS) {
 893                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 894                         return false;
 895                 }
 896         }
 897         if (ret != PAM_SUCCESS) {
 898                 return false;
 899         }
 900         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 901
 902         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 903                 retval = true;
 904         }
 905
 906         _pam_drop_reply(resp, 1);
 907         return retval;
 908 }
 909 #else
 910 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 911 {
 912         return false;
 913 }
 914 #endif
 915
 916 /**
 917  * send a password expiry message if required
 918  *
 919  * @param ctx PAM winbind context.
 920  * @param next_change expected (calculated) next expiry date.
 921  * @param already_expired pointer to a boolean to indicate if the password is
 922  *        already expired.
 923  *
 924  * @return boolean Returns true if message has been sent, false if not.
 925  */
 926
 927 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 928                                               time_t next_change,
 929                                               time_t now,
 930                                               int warn_pwd_expire,
 931                                               bool *already_expired,
 932                                               bool *change_pwd)
 933 {
 934         int days = 0;
 935         struct tm tm_now, tm_next_change;
 936         bool retval = false;
 937         int ret;
 938
 939         if (already_expired) {
 940                 *already_expired = false;
 941         }
 942
 943         if (change_pwd) {
 944                 *change_pwd = false;
 945         }
 946
 947         if (next_change <= now) {
 948                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 949                 if (already_expired) {
 950                         *already_expired = true;
 951                 }
 952                 return true;
 953         }
 954
 955         if ((next_change < 0) ||
 956             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 957                 return false;
 958         }
 959
 960         if ((localtime_r(&now, &tm_now) == NULL) ||
 961             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 962                 return false;
 963         }
 964
 965         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 966                (tm_now.tm_yday+tm_now.tm_year*365);
 967
 968         if (days == 0) {
 969                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 970                                 _("Your password expires today.\n"));
 971
 972                 /*
 973                  * If change_pwd and already_expired is null.
 974                  * We are just sending a notification message.
 975                  * We don't expect any response in this case.
 976                  */
 977
 978                 if (!change_pwd && !already_expired) {
 979                         return true;
 980                 }
 981
 982                 /*
 983                  * successfully sent the warning message.
 984                  * Give the user a chance to change pwd.
 985                  */
 986                 if (ret == PAM_SUCCESS &&
 987                     (ctx->ctrl & WINBIND_PWD_CHANGE_PROMPT)) {
 988                         if (change_pwd) {
 989                                 retval = _pam_winbind_change_pwd(ctx);
 990                                 if (retval) {
 991                                         *change_pwd = true;
 992                                 }
 993                         }
 994                 }
 995                 return true;
 996         }
 997
 998         if (days > 0 && days < warn_pwd_expire) {
 999
1000                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
1001                                         _("Your password will expire in %d %s.\n"),
1002                                         days, (days > 1) ? _("days"):_("day"));
1003                 /*
1004                  * If change_pwd and already_expired is null.
1005                  * We are just sending a notification message.
1006                  * We don't expect any response in this case.
1007                  */
1008
1009                 if (!change_pwd && !already_expired) {
1010                         return true;
1011                 }
1012
1013                 /*
1014                  * successfully sent the warning message.
1015                  * Give the user a chance to change pwd.
1016                  */
1017                 if (ret == PAM_SUCCESS &&
1018                     (ctx->ctrl & WINBIND_PWD_CHANGE_PROMPT)) {
1019                         if (change_pwd) {
1020                                 retval = _pam_winbind_change_pwd(ctx);
1021                                 if (retval) {
1022                                         *change_pwd = true;
1023                                 }
1024                         }
1025                 }
1026                 return true;
1027         }
1028
1029         return false;
1030 }
1031
1032 /**
1033  * Send a warning if the password expires in the near future
1034  *
1035  * @param ctx PAM winbind context.
1036  * @param response The full authentication response structure.
1037  * @param already_expired boolean, is the pwd already expired?
1038  *
1039  * @return void.
1040  */
1041
1042 static void _pam_warn_password_expiry(struct pwb_context *ctx,
1043                                       const struct wbcAuthUserInfo *info,
1044                                       int warn_pwd_expire,
1045                                       bool *already_expired,
1046                                       bool *change_pwd)
1047 {
1048         time_t now = time(NULL);
1049         time_t next_change = 0;
1050
1051         if (info == NULL) {
1052                 return;
1053         }
1054
1055         if (already_expired) {
1056                 *already_expired = false;
1057         }
1058
1059         if (change_pwd) {
1060                 *change_pwd = false;
1061         }
1062
1063         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
1064         if (info->acct_flags & WBC_ACB_PWNOEXP) {
1065                 return;
1066         }
1067
1068         /* no point in sending a warning if this is a grace logon */
1069         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1070                 return;
1071         }
1072
1073         /* check if the info3 must change timestamp has been set */
1074         next_change = info->pass_must_change_time;
1075
1076         if (_pam_send_password_expiry_message(ctx, next_change, now,
1077                                               warn_pwd_expire,
1078                                               already_expired,
1079                                               change_pwd)) {
1080                 return;
1081         }
1082
1083         /* no warning sent */
1084 }
1085
1086 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1087
1088 /**
1089  * Append a string, making sure not to overflow and to always return a
1090  * NULL-terminated string.
1091  *
1092  * @param dest Destination string buffer (must already be NULL-terminated).
1093  * @param src Source string buffer.
1094  * @param dest_buffer_size Size of dest buffer in bytes.
1095  *
1096  * @return false if dest buffer is not big enough (no bytes copied), true on
1097  * success.
1098  */
1099
1100 static bool safe_append_string(char *dest,
1101                                const char *src,
1102                                int dest_buffer_size)
1103 {
1104         size_t len;
1105         len = strlcat(dest, src, dest_buffer_size);
1106         return (len < dest_buffer_size);
1107 }
1108
1109 /**
1110  * Convert a names into a SID string, appending it to a buffer.
1111  *
1112  * @param ctx PAM winbind context.
1113  * @param user User in PAM request.
1114  * @param name Name to convert.
1115  * @param sid_list_buffer Where to append the string sid.
1116  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1117  *
1118  * @return false on failure, true on success.
1119  */
1120 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1121                                        const char *user,
1122                                        const char *name,
1123                                        char *sid_list_buffer,
1124                                        int sid_list_buffer_size)
1125 {
1126         char sid_string[WBC_SID_STRING_BUFLEN];
1127
1128         /* lookup name? */
1129         if (IS_SID_STRING(name)) {
1130                 strlcpy(sid_string, name, sizeof(sid_string));
1131         } else {
1132                 wbcErr wbc_status;
1133                 struct wbcDomainSid sid;
1134                 enum wbcSidType type;
1135
1136                 _pam_log_debug(ctx, LOG_DEBUG,
1137                                "no sid given, looking up: %s\n", name);
1138
1139                 wbc_status = wbcCtxLookupName(ctx->wbc_ctx,
1140                                               "",
1141                                               name,
1142                                               &sid,
1143                                               &type);
1144                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1145                         _pam_log(ctx, LOG_INFO,
1146                                  "could not lookup name: %s\n", name);
1147                         return false;
1148                 }
1149
1150                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1151         }
1152
1153         if (!safe_append_string(sid_list_buffer, sid_string,
1154                                 sid_list_buffer_size)) {
1155                 return false;
1156         }
1157         return true;
1158 }
1159
1160 /**
1161  * Convert a list of names into a list of sids.
1162  *
1163  * @param ctx PAM winbind context.
1164  * @param user User in PAM request.
1165  * @param name_list List of names or string sids, separated by commas.
1166  * @param sid_list_buffer Where to put the list of string sids.
1167  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1168  *
1169  * @return false on failure, true on success.
1170  */
1171 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1172                                                  const char *user,
1173                                                  const char *name_list,
1174                                                  char *sid_list_buffer,
1175                                                  int sid_list_buffer_size)
1176 {
1177         bool result = false;
1178         char *current_name = NULL;
1179         const char *search_location;
1180         const char *comma;
1181         int len;
1182
1183         if (sid_list_buffer_size > 0) {
1184                 sid_list_buffer[0] = 0;
1185         }
1186
1187         search_location = name_list;
1188         while ((comma = strchr(search_location, ',')) != NULL) {
1189                 current_name = strndup(search_location,
1190                                        comma - search_location);
1191                 if (NULL == current_name) {
1192                         goto out;
1193                 }
1194
1195                 if (!winbind_name_to_sid_string(ctx, user,
1196                                                 current_name,
1197                                                 sid_list_buffer,
1198                                                 sid_list_buffer_size)) {
1199                         /*
1200                          * If one group name failed, we must not fail
1201                          * the authentication totally, continue with
1202                          * the following group names. If user belongs to
1203                          * one of the valid groups, we must allow it
1204                          * login. -- BoYang
1205                          */
1206
1207                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1208                                  "check if group %s is valid group.", current_name,
1209                                  current_name);
1210                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1211                                         "to sid, please contact your administrator to see "
1212                                         "if group %s is valid."), current_name, current_name);
1213                         SAFE_FREE(current_name);
1214                         search_location = comma + 1;
1215                         continue;
1216                 }
1217
1218                 SAFE_FREE(current_name);
1219
1220                 if (!safe_append_string(sid_list_buffer, ",",
1221                                         sid_list_buffer_size)) {
1222                         goto out;
1223                 }
1224
1225                 search_location = comma + 1;
1226         }
1227
1228         if (!winbind_name_to_sid_string(ctx, user, search_location,
1229                                         sid_list_buffer,
1230                                         sid_list_buffer_size)) {
1231                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1232                          "check if group %s is valid group.", search_location,
1233                          search_location);
1234                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1235                                 "to sid, please contact your administrator to see "
1236                                 "if group %s is valid."), search_location, search_location);
1237
1238                 /* If no valid groups were converted we should fail outright */
1239                 if (name_list != NULL && strlen(sid_list_buffer) == 0) {
1240                         result = false;
1241                         goto out;
1242                 }
1243                 /*
1244                  * The lookup of the last name failed..
1245                  * It results in require_member_of_sid ends with ','
1246                  * It is malformatted parameter here, overwrite the last ','.
1247                  */
1248                 len = strlen(sid_list_buffer);
1249                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1250                         sid_list_buffer[len - 1] = '\0';
1251                 }
1252         }
1253
1254         result = true;
1255
1256 out:
1257         SAFE_FREE(current_name);
1258         return result;
1259 }
1260
1261 /**
1262  * put krb5ccname variable into environment
1263  *
1264  * @param ctx PAM winbind context.
1265  * @param krb5ccname env variable retrieved from winbindd.
1266  *
1267  * @return void.
1268  */
1269
1270 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1271                                 struct wbcLogonUserInfo *info)
1272 {
1273         char *var = NULL;
1274         int ret;
1275         uint32_t i;
1276         const char *krb5ccname = NULL;
1277
1278         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1279                 return;
1280         }
1281
1282         if (!info) {
1283                 return;
1284         }
1285
1286         for (i=0; i < info->num_blobs; i++) {
1287                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1288                         krb5ccname = (const char *)info->blobs[i].blob.data;
1289                         break;
1290                 }
1291         }
1292
1293         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1294                 return;
1295         }
1296
1297         _pam_log_debug(ctx, LOG_DEBUG,
1298                        "request returned KRB5CCNAME: %s", krb5ccname);
1299
1300         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1301                 return;
1302         }
1303
1304         ret = pam_putenv(ctx->pamh, var);
1305         if (ret != PAM_SUCCESS) {
1306                 _pam_log(ctx, LOG_ERR,
1307                          "failed to set KRB5CCNAME to %s: %s",
1308                          var, pam_strerror(ctx->pamh, ret));
1309         }
1310         free(var);
1311 }
1312
1313 /**
1314  * Copy unix username if available (further processed in PAM).
1315  *
1316  * @param ctx PAM winbind context
1317  * @param user_ret A pointer that holds a pointer to a string
1318  * @param unix_username A username
1319  *
1320  * @return void.
1321  */
1322
1323 static void _pam_setup_unix_username(struct pwb_context *ctx,
1324                                      char **user_ret,
1325                                      struct wbcLogonUserInfo *info)
1326 {
1327         const char *unix_username = NULL;
1328         uint32_t i;
1329
1330         if (!user_ret || !info) {
1331                 return;
1332         }
1333
1334         for (i=0; i < info->num_blobs; i++) {
1335                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1336                         unix_username = (const char *)info->blobs[i].blob.data;
1337                         break;
1338                 }
1339         }
1340
1341         if (!unix_username || !unix_username[0]) {
1342                 return;
1343         }
1344
1345         *user_ret = strdup(unix_username);
1346 }
1347
1348 /**
1349  * Set string into the PAM stack.
1350  *
1351  * @param ctx PAM winbind context.
1352  * @param data_name Key name for pam_set_data.
1353  * @param value String value.
1354  *
1355  * @return void.
1356  */
1357
1358 static void _pam_set_data_string(struct pwb_context *ctx,
1359                                  const char *data_name,
1360                                  const char *value)
1361 {
1362         int ret;
1363
1364         if (!data_name || !value || (strlen(data_name) == 0) ||
1365              (strlen(value) == 0)) {
1366                 return;
1367         }
1368
1369         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1370                            _pam_winbind_cleanup_func);
1371         if (ret != PAM_SUCCESS) {
1372                 _pam_log_debug(ctx, LOG_DEBUG,
1373                                "Could not set data %s: %s\n",
1374                                data_name, pam_strerror(ctx->pamh, ret));
1375         }
1376 }
1377
1378 /**
1379  * Set info3 strings into the PAM stack.
1380  *
1381  * @param ctx PAM winbind context.
1382  * @param data_name Key name for pam_set_data.
1383  * @param value String value.
1384  *
1385  * @return void.
1386  */
1387
1388 static void _pam_set_data_info3(struct pwb_context *ctx,
1389                                 const struct wbcAuthUserInfo *info)
1390 {
1391         if (info != NULL) {
1392                 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1393                              info->home_directory);
1394                 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1395                              info->logon_script);
1396                 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1397                              info->logon_server);
1398                 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1399                              info->profile_path);
1400         }
1401 }
1402
1403 /**
1404  * Free info3 strings in the PAM stack.
1405  *
1406  * @param pamh PAM handle
1407  *
1408  * @return void.
1409  */
1410
1411 static void _pam_free_data_info3(pam_handle_t *pamh)
1412 {
1413         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1414         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1415         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1416         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1417 }
1418
1419 /**
1420  * Send PAM_ERROR_MSG for cached or grace logons.
1421  *
1422  * @param ctx PAM winbind context.
1423  * @param username User in PAM request.
1424  * @param info3_user_flgs Info3 flags containing logon type bits.
1425  *
1426  * @return void.
1427  */
1428
1429 static void _pam_warn_logon_type(struct pwb_context *ctx,
1430                                  const char *username,
1431                                  uint32_t info3_user_flgs)
1432 {
1433         /* inform about logon type */
1434         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1435
1436                 _make_remark(ctx, PAM_ERROR_MSG,
1437                              _("Grace login. "
1438                                "Please change your password as soon you're "
1439                                "online again"));
1440                 _pam_log_debug(ctx, LOG_DEBUG,
1441                                "User %s logged on using grace logon\n",
1442                                username);
1443
1444         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1445
1446                 _make_remark(ctx, PAM_ERROR_MSG,
1447                              _("Domain Controller unreachable, "
1448                                "using cached credentials instead. "
1449                                "Network resources may be unavailable"));
1450                 _pam_log_debug(ctx, LOG_DEBUG,
1451                                "User %s logged on using cached credentials\n",
1452                                username);
1453         }
1454 }
1455
1456 /**
1457  * Send PAM_ERROR_MSG for krb5 errors.
1458  *
1459  * @param ctx PAM winbind context.
1460  * @param username User in PAM request.
1461  * @param info3_user_flgs Info3 flags containing logon type bits.
1462  *
1463  * @return void.
1464  */
1465
1466 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1467                                    const char *username,
1468                                    uint32_t info3_user_flgs)
1469 {
1470         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1471                 _make_remark(ctx, PAM_ERROR_MSG,
1472                              _("Failed to establish your Kerberos Ticket cache "
1473                                "due time differences\n"
1474                                "with the domain controller.  "
1475                                "Please verify the system time.\n"));
1476                 _pam_log_debug(ctx, LOG_DEBUG,
1477                                "User %s: Clock skew when getting Krb5 TGT\n",
1478                                username);
1479         }
1480 }
1481
1482 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1483                                        const struct wbcAuthErrorInfo *e,
1484                                        const char *nt_status_string,
1485                                        int *pam_err)
1486 {
1487         const char *ntstatus = NULL;
1488         const char *error_string = NULL;
1489
1490         if (!e || !pam_err) {
1491                 return false;
1492         }
1493
1494         ntstatus = e->nt_string;
1495         if (!ntstatus) {
1496                 return false;
1497         }
1498
1499         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1500
1501                 error_string = _get_ntstatus_error_string(nt_status_string);
1502                 if (error_string) {
1503                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1504                         *pam_err = e->pam_error;
1505                         return true;
1506                 }
1507
1508                 if (e->display_string) {
1509                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1510                         *pam_err = e->pam_error;
1511                         return true;
1512                 }
1513
1514                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1515                 *pam_err = e->pam_error;
1516
1517                 return true;
1518         }
1519
1520         return false;
1521 };
1522
1523 /**
1524  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1525  *
1526  * @param i The wbcUserPasswordPolicyInfo struct.
1527  *
1528  * @return string (caller needs to talloc_free).
1529  */
1530
1531 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1532                                                  struct wbcUserPasswordPolicyInfo *i)
1533 {
1534         char *str = NULL;
1535
1536         if (!i) {
1537                 goto failed;
1538         }
1539
1540         str = talloc_asprintf(ctx, _("Your password "));
1541         if (!str) {
1542                 goto failed;
1543         }
1544
1545         if (i->min_length_password > 0) {
1546                 str = talloc_asprintf_append(str,
1547                                _("must be at least %d characters; "),
1548                                i->min_length_password);
1549                 if (!str) {
1550                         goto failed;
1551                 }
1552         }
1553
1554         if (i->password_history > 0) {
1555                 str = talloc_asprintf_append(str,
1556                                _("cannot repeat any of your previous %d "
1557                                 "passwords; "),
1558                                i->password_history);
1559                 if (!str) {
1560                         goto failed;
1561                 }
1562         }
1563
1564         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1565                 str = talloc_asprintf_append(str,
1566                                _("must contain capitals, numerals "
1567                                  "or punctuation; "
1568                                  "and cannot contain your account "
1569                                  "or full name; "));
1570                 if (!str) {
1571                         goto failed;
1572                 }
1573         }
1574
1575         str = talloc_asprintf_append(str,
1576                        _("Please type a different password. "
1577                          "Type a password which meets these requirements in "
1578                          "both text boxes."));
1579         if (!str) {
1580                 goto failed;
1581         }
1582
1583         return str;
1584
1585  failed:
1586         TALLOC_FREE(str);
1587         return NULL;
1588 }
1589
1590 static int _pam_create_homedir(struct pwb_context *ctx,
1591                                const char *dirname,
1592                                mode_t mode)
1593 {
1594         int ret;
1595
1596         ret = mkdir(dirname, mode);
1597         if (ret != 0 && errno == EEXIST) {
1598                 struct stat sbuf;
1599
1600                 ret = stat(dirname, &sbuf);
1601                 if (ret != 0) {
1602                         return PAM_PERM_DENIED;
1603                 }
1604
1605                 if (!S_ISDIR(sbuf.st_mode)) {
1606                         return PAM_PERM_DENIED;
1607                 }
1608         }
1609
1610         if (ret != 0) {
1611                 _make_remark_format(ctx, PAM_TEXT_INFO,
1612                                     _("Creating directory: %s failed: %s"),
1613                                     dirname, strerror(errno));
1614                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1615                  dirname, strerror(errno));
1616                  return PAM_PERM_DENIED;
1617         }
1618
1619         return PAM_SUCCESS;
1620 }
1621
1622 static int _pam_chown_homedir(struct pwb_context *ctx,
1623                               const char *dirname,
1624                               uid_t uid,
1625                               gid_t gid)
1626 {
1627         if (chown(dirname, uid, gid) != 0) {
1628                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1629                          dirname, strerror(errno));
1630                 return PAM_PERM_DENIED;
1631         }
1632
1633         return PAM_SUCCESS;
1634 }
1635
1636 static int _pam_mkhomedir(struct pwb_context *ctx)
1637 {
1638         struct passwd *pwd = NULL;
1639         char *token = NULL;
1640         char *create_dir = NULL;
1641         char *user_dir = NULL;
1642         int ret;
1643         const char *username;
1644         mode_t mode = 0700;
1645         char *safe_ptr = NULL;
1646         char *p = NULL;
1647
1648         /* Get the username */
1649         ret = pam_get_user(ctx->pamh, &username, NULL);
1650         if ((ret != PAM_SUCCESS) || (!username)) {
1651                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1652                 return PAM_SERVICE_ERR;
1653         }
1654
1655         pwd = getpwnam(username);
1656         if (pwd == NULL) {
1657                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1658                 return PAM_USER_UNKNOWN;
1659         }
1660         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1661
1662         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1663         if (ret == PAM_SUCCESS) {
1664                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1665                                          pwd->pw_uid,
1666                                          pwd->pw_gid);
1667         }
1668
1669         if (ret == PAM_SUCCESS) {
1670                 return ret;
1671         }
1672
1673         /* maybe we need to create parent dirs */
1674         create_dir = talloc_strdup(ctx, "/");
1675         if (!create_dir) {
1676                 return PAM_BUF_ERR;
1677         }
1678
1679         /* find final directory */
1680         user_dir = strrchr(pwd->pw_dir, '/');
1681         if (!user_dir) {
1682                 return PAM_BUF_ERR;
1683         }
1684         user_dir++;
1685
1686         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1687
1688         p = pwd->pw_dir;
1689
1690         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1691
1692                 mode = 0755;
1693
1694                 p = NULL;
1695
1696                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1697
1698                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1699                 if (!create_dir) {
1700                         return PAM_BUF_ERR;
1701                 }
1702                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1703
1704                 if (strcmp(token, user_dir) == 0) {
1705                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1706                         mode = 0700;
1707                 }
1708
1709                 ret = _pam_create_homedir(ctx, create_dir, mode);
1710                 if (ret != PAM_SUCCESS) {
1711                         return ret;
1712                 }
1713         }
1714
1715         return _pam_chown_homedir(ctx, create_dir,
1716                                   pwd->pw_uid,
1717                                   pwd->pw_gid);
1718 }
1719
1720 /* talk to winbindd */
1721 static int winbind_auth_request(struct pwb_context *ctx,
1722                                 const char *user,
1723                                 const char *pass,
1724                                 const char *member,
1725                                 const char *cctype,
1726                                 const int warn_pwd_expire,
1727                                 struct wbcAuthErrorInfo **p_error,
1728                                 struct wbcLogonUserInfo **p_info,
1729                                 time_t *pwd_last_set,
1730                                 char **user_ret)
1731 {
1732         wbcErr wbc_status;
1733         struct wbcLogonUserParams logon;
1734         char membership_of[1024];
1735         uid_t user_uid = -1;
1736         uint32_t flags = WBFLAG_PAM_INFO3_TEXT;
1737         struct wbcLogonUserInfo *info = NULL;
1738         struct wbcAuthUserInfo *user_info = NULL;
1739         struct wbcAuthErrorInfo *error = NULL;
1740         int ret = PAM_AUTH_ERR;
1741         int i;
1742         const char *codes[] = {
1743                 "NT_STATUS_PASSWORD_EXPIRED",
1744                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1745                 "NT_STATUS_INVALID_WORKSTATION",
1746                 "NT_STATUS_INVALID_LOGON_HOURS",
1747                 "NT_STATUS_ACCOUNT_EXPIRED",
1748                 "NT_STATUS_ACCOUNT_DISABLED",
1749                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1750                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1751                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1752                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1753                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1754                 "NT_STATUS_NO_LOGON_SERVERS",
1755                 "NT_STATUS_WRONG_PASSWORD",
1756                 "NT_STATUS_ACCESS_DENIED"
1757         };
1758
1759         if (pwd_last_set) {
1760                 *pwd_last_set = 0;
1761         }
1762
1763         /* Krb5 auth always has to go against the KDC of the user's realm */
1764
1765         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1766                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1767         }
1768
1769         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1770                 struct passwd *pwd = NULL;
1771
1772                 pwd = getpwnam(user);
1773                 if (pwd == NULL) {
1774                         return PAM_USER_UNKNOWN;
1775                 }
1776                 user_uid        = pwd->pw_uid;
1777         }
1778
1779         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1780
1781                 _pam_log_debug(ctx, LOG_DEBUG,
1782                                "enabling krb5 login flag\n");
1783
1784                 flags           |= WBFLAG_PAM_KRB5 |
1785                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1786         }
1787
1788         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1789                 _pam_log_debug(ctx, LOG_DEBUG,
1790                                "enabling cached login flag\n");
1791                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1792         }
1793
1794         if (user_ret) {
1795                 *user_ret = NULL;
1796                 flags           |= WBFLAG_PAM_UNIX_NAME;
1797         }
1798
1799         if (cctype != NULL) {
1800                 _pam_log_debug(ctx, LOG_DEBUG,
1801                                "enabling request for a %s krb5 ccache\n",
1802                                cctype);
1803         }
1804
1805         if (member != NULL) {
1806
1807                 ZERO_STRUCT(membership_of);
1808
1809                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1810                                                           membership_of,
1811                                                           sizeof(membership_of))) {
1812                         _pam_log_debug(ctx, LOG_ERR,
1813                                        "failed to serialize membership of sid "
1814                                        "\"%s\"\n", member);
1815                         return PAM_AUTH_ERR;
1816                 }
1817         }
1818
1819         ZERO_STRUCT(logon);
1820
1821         logon.username                  = user;
1822         logon.password                  = pass;
1823
1824         if (cctype) {
1825                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1826                                              &logon.blobs,
1827                                              "krb5_cc_type",
1828                                              0,
1829                                              discard_const_p(uint8_t, cctype),
1830                                              strlen(cctype)+1);
1831                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1832                         goto done;
1833                 }
1834         }
1835
1836         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1837                                      &logon.blobs,
1838                                      "flags",
1839                                      0,
1840                                      (uint8_t *)&flags,
1841                                      sizeof(flags));
1842         if (!WBC_ERROR_IS_OK(wbc_status)) {
1843                 goto done;
1844         }
1845
1846         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1847                                      &logon.blobs,
1848                                      "user_uid",
1849                                      0,
1850                                      (uint8_t *)&user_uid,
1851                                      sizeof(user_uid));
1852         if (!WBC_ERROR_IS_OK(wbc_status)) {
1853                 goto done;
1854         }
1855
1856         if (member) {
1857                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1858                                              &logon.blobs,
1859                                              "membership_of",
1860                                              0,
1861                                              (uint8_t *)membership_of,
1862                                              sizeof(membership_of));
1863                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1864                         goto done;
1865                 }
1866         }
1867
1868         wbc_status = wbcCtxLogonUser(ctx->wbc_ctx,
1869                                      &logon,
1870                                      &info,
1871                                      &error,
1872                                      NULL);
1873         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1874                                           user, "wbcLogonUser");
1875         wbcFreeMemory(logon.blobs);
1876         logon.blobs = NULL;
1877
1878         if (info && info->info) {
1879                 user_info = info->info;
1880         }
1881
1882         if (pwd_last_set && user_info) {
1883                 *pwd_last_set = user_info->pass_last_set_time;
1884         }
1885
1886         if (p_info && info) {
1887                 *p_info = info;
1888         }
1889
1890         if (p_error && error) {
1891                 /* We want to process the error in the caller. */
1892                 *p_error = error;
1893                 return ret;
1894         }
1895
1896         for (i=0; i<ARRAY_SIZE(codes); i++) {
1897                 int _ret = ret;
1898                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1899                         ret = _ret;
1900                         goto done;
1901                 }
1902         }
1903
1904         if ((ret == PAM_SUCCESS) && user_info && info) {
1905
1906                 bool already_expired = false;
1907                 bool change_pwd = false;
1908
1909                 /* warn a user if the password is about to expire soon */
1910                 _pam_warn_password_expiry(ctx, user_info,
1911                                           warn_pwd_expire,
1912                                           &already_expired,
1913                                           &change_pwd);
1914
1915                 if (already_expired == true) {
1916
1917                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1918                         SMB_TIME_T must_set = user_info->pass_must_change_time;
1919
1920                         _pam_log_debug(ctx, LOG_DEBUG,
1921                                        "Password has expired "
1922                                        "(Password was last set: %lld, "
1923                                        "it must be changed here "
1924                                        "%lld (now it's: %ld))\n",
1925                                        (long long int)last_set,
1926                                        (long long int)must_set,
1927                                        (long)time(NULL));
1928
1929                         return PAM_AUTHTOK_EXPIRED;
1930                 }
1931
1932                 if (change_pwd) {
1933                         ret = PAM_NEW_AUTHTOK_REQD;
1934                         goto done;
1935                 }
1936
1937                 /* inform about logon type */
1938                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1939
1940                 /* inform about krb5 failures */
1941                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1942
1943                 /* set some info3 info for other modules in the stack */
1944                 _pam_set_data_info3(ctx, user_info);
1945
1946                 /* put krb5ccname into env */
1947                 _pam_setup_krb5_env(ctx, info);
1948
1949                 /* If winbindd returned a username, return the pointer to it
1950                  * here. */
1951                 _pam_setup_unix_username(ctx, user_ret, info);
1952         }
1953
1954  done:
1955         wbcFreeMemory(logon.blobs);
1956         if (info && info->blobs && !p_info) {
1957                 wbcFreeMemory(info->blobs);
1958                 /*
1959                  * We set blobs to NULL to prevent a use after free in the
1960                  * in the wbcLogonUserInfoDestructor
1961                  */
1962                 info->blobs = NULL;
1963         }
1964         if (error && !p_error) {
1965                 wbcFreeMemory(error);
1966         }
1967         if (info && !p_info) {
1968                 wbcFreeMemory(info);
1969         }
1970
1971         return ret;
1972 }
1973
1974 /* talk to winbindd */
1975 static int winbind_chauthtok_request(struct pwb_context *ctx,
1976                                      const char *user,
1977                                      const char *oldpass,
1978                                      const char *newpass,
1979                                      time_t pwd_last_set)
1980 {
1981         wbcErr wbc_status;
1982         struct wbcChangePasswordParams params;
1983         struct wbcAuthErrorInfo *error = NULL;
1984         struct wbcUserPasswordPolicyInfo *policy = NULL;
1985         enum wbcPasswordChangeRejectReason reject_reason = -1;
1986         uint32_t flags = 0;
1987
1988         int i;
1989         const char *codes[] = {
1990                 "NT_STATUS_BACKUP_CONTROLLER",
1991                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1992                 "NT_STATUS_NO_LOGON_SERVERS",
1993                 "NT_STATUS_ACCESS_DENIED",
1994                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1995                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1996                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1997         };
1998         int ret = PAM_AUTH_ERR;
1999
2000         ZERO_STRUCT(params);
2001
2002         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2003                 flags |= WBFLAG_PAM_KRB5 |
2004                          WBFLAG_PAM_CONTACT_TRUSTDOM;
2005         }
2006
2007         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
2008                 flags |= WBFLAG_PAM_CACHED_LOGIN;
2009         }
2010
2011         params.account_name             = user;
2012         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
2013         params.old_password.plaintext   = oldpass;
2014         params.new_password.plaintext   = newpass;
2015         params.flags                    = flags;
2016
2017         wbc_status = wbcCtxChangeUserPasswordEx(ctx->wbc_ctx,
2018                                                 &params,
2019                                                 &error,
2020                                                 &reject_reason,
2021                                                 &policy);
2022         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2023                                           user, "wbcChangeUserPasswordEx");
2024
2025         if (WBC_ERROR_IS_OK(wbc_status)) {
2026                 _pam_log(ctx, LOG_NOTICE,
2027                          "user '%s' password changed", user);
2028                 return PAM_SUCCESS;
2029         }
2030
2031         if (!error) {
2032                 wbcFreeMemory(policy);
2033                 return ret;
2034         }
2035
2036         for (i=0; i<ARRAY_SIZE(codes); i++) {
2037                 int _ret = ret;
2038                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
2039                         ret = _ret;
2040                         goto done;
2041                 }
2042         }
2043
2044         if (!strcasecmp(error->nt_string,
2045                         "NT_STATUS_PASSWORD_RESTRICTION")) {
2046
2047                 char *pwd_restriction_string = NULL;
2048                 SMB_TIME_T min_pwd_age = 0;
2049
2050                 if (policy) {
2051                         min_pwd_age     = policy->min_passwordage;
2052                 }
2053
2054                 /* FIXME: avoid to send multiple PAM messages after another */
2055                 switch ((int)reject_reason) {
2056                         case -1:
2057                                 break;
2058                         case WBC_PWD_CHANGE_NO_ERROR:
2059                                 if ((min_pwd_age > 0) &&
2060                                     (pwd_last_set + min_pwd_age > time(NULL))) {
2061                                         time_t next_change = pwd_last_set + min_pwd_age;
2062 #if defined(__clang__)
2063 #pragma clang diagnostic push
2064 #pragma clang diagnostic ignored "-Wformat-nonliteral"
2065 #endif
2066                                         _make_remark_format(ctx, PAM_ERROR_MSG,
2067                                                 _get_ntstatus_error_string("NT_STATUS_PWD_TOO_RECENT"),
2068                                                 ctime(&next_change));
2069 #if defined(__clang__)
2070 #pragma clang diagnostic pop
2071 #endif
2072                                         goto done;
2073                                 }
2074                                 break;
2075                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2076                                 PAM_WB_REMARK_DIRECT(ctx,
2077                                         "NT_STATUS_PWD_TOO_SHORT");
2078                                 break;
2079                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2080                                 PAM_WB_REMARK_DIRECT(ctx,
2081                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2082                                 break;
2083                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2084                                 _make_remark(ctx, PAM_ERROR_MSG,
2085                                              _("Password does not meet "
2086                                                "complexity requirements"));
2087                                 break;
2088                         default:
2089                                 _pam_log_debug(ctx, LOG_DEBUG,
2090                                                "unknown password change "
2091                                                "reject reason: %d",
2092                                                reject_reason);
2093                                 break;
2094                 }
2095
2096                 pwd_restriction_string =
2097                         _pam_compose_pwd_restriction_string(ctx, policy);
2098                 if (pwd_restriction_string) {
2099                         _make_remark(ctx, PAM_ERROR_MSG,
2100                                      pwd_restriction_string);
2101                         TALLOC_FREE(pwd_restriction_string);
2102                 }
2103         }
2104  done:
2105         wbcFreeMemory(error);
2106         wbcFreeMemory(policy);
2107
2108         return ret;
2109 }
2110
2111 /*
2112  * Checks if a user has an account
2113  *
2114  * return values:
2115  *       1  = User not found
2116  *       0  = OK
2117  *      -1  = System error
2118  */
2119 static int valid_user(struct pwb_context *ctx,
2120                       const char *user)
2121 {
2122         /* check not only if the user is available over NSS calls, also make
2123          * sure it's really a winbind user, this is important when stacking PAM
2124          * modules in the 'account' or 'password' facility. */
2125
2126         wbcErr wbc_status;
2127         struct passwd *pwd = NULL;
2128         struct passwd *wb_pwd = NULL;
2129
2130         pwd = getpwnam(user);
2131         if (pwd == NULL) {
2132                 return 1;
2133         }
2134
2135         wbc_status = wbcCtxGetpwnam(ctx->wbc_ctx, user, &wb_pwd);
2136         wbcFreeMemory(wb_pwd);
2137         if (!WBC_ERROR_IS_OK(wbc_status)) {
2138                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2139                         wbcErrorString(wbc_status));
2140         }
2141
2142         switch (wbc_status) {
2143                 case WBC_ERR_UNKNOWN_USER:
2144                 /* match other insane libwbclient return codes */
2145                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2146                 case WBC_ERR_DOMAIN_NOT_FOUND:
2147                 case WBC_ERR_NOT_MAPPED:
2148                         return 1;
2149                 case WBC_ERR_SUCCESS:
2150                         return 0;
2151                 default:
2152                         break;
2153         }
2154         return -1;
2155 }
2156
2157 static char *_pam_delete(register char *xx)
2158 {
2159         _pam_overwrite(xx);
2160         _pam_drop(xx);
2161         return NULL;
2162 }
2163
2164 /*
2165  * obtain a password from the user
2166  */
2167
2168 static int _winbind_read_password(struct pwb_context *ctx,
2169                                   unsigned int ctrl,
2170                                   const char *comment,
2171                                   const char *prompt1,
2172                                   const char *prompt2,
2173                                   const char **pass)
2174 {
2175         int authtok_flag;
2176         int retval;
2177         const char *item;
2178         char *token;
2179
2180         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2181
2182         /*
2183          * make sure nothing inappropriate gets returned
2184          */
2185
2186         *pass = token = NULL;
2187
2188         /*
2189          * which authentication token are we getting?
2190          */
2191
2192         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2193                 authtok_flag = PAM_OLDAUTHTOK;
2194         } else {
2195                 authtok_flag = PAM_AUTHTOK;
2196         }
2197
2198         /*
2199          * should we obtain the password from a PAM item ?
2200          */
2201
2202         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2203             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2204                 retval = pam_get_item(ctx->pamh,
2205                                       authtok_flag,
2206                                       (const void **) &item);
2207                 if (retval != PAM_SUCCESS) {
2208                         /* very strange. */
2209                         _pam_log(ctx, LOG_ALERT,
2210                                  "pam_get_item returned error "
2211                                  "to unix-read-password");
2212                         return retval;
2213                 } else if (item != NULL) {      /* we have a password! */
2214                         *pass = item;
2215                         item = NULL;
2216                         _pam_log(ctx, LOG_DEBUG,
2217                                  "pam_get_item returned a password");
2218                         return PAM_SUCCESS;
2219                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2220                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2221                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2222                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2223                         return PAM_AUTHTOK_RECOVER_ERR;
2224                 }
2225         }
2226         /*
2227          * getting here implies we will have to get the password from the
2228          * user directly.
2229          */
2230
2231         {
2232                 struct pam_message msg[3];
2233                 const struct pam_message *pmsg[3];
2234                 struct pam_response *resp;
2235                 int i, replies;
2236
2237                 /* prepare to converse */
2238
2239                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2240                         pmsg[0] = &msg[0];
2241                         msg[0].msg_style = PAM_TEXT_INFO;
2242                         msg[0].msg = discard_const_p(char, comment);
2243                         i = 1;
2244                 } else {
2245                         i = 0;
2246                 }
2247
2248                 pmsg[i] = &msg[i];
2249                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2250                 msg[i++].msg = discard_const_p(char, prompt1);
2251                 replies = 1;
2252
2253                 if (prompt2 != NULL) {
2254                         pmsg[i] = &msg[i];
2255                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2256                         msg[i++].msg = discard_const_p(char, prompt2);
2257                         ++replies;
2258                 }
2259                 /* so call the conversation expecting i responses */
2260                 resp = NULL;
2261                 retval = converse(ctx->pamh, i, pmsg, &resp);
2262                 if (resp == NULL) {
2263                         if (retval == PAM_SUCCESS) {
2264                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2265                         }
2266                         goto done;
2267                 }
2268                 if (retval != PAM_SUCCESS) {
2269                         _pam_drop_reply(resp, i);
2270                         goto done;
2271                 }
2272
2273                 /* interpret the response */
2274
2275                 token = x_strdup(resp[i - replies].resp);
2276                 if (!token) {
2277                         _pam_log(ctx, LOG_NOTICE,
2278                                  "could not recover "
2279                                  "authentication token");
2280                         retval = PAM_AUTHTOK_RECOVER_ERR;
2281                         goto done;
2282                 }
2283
2284                 if (replies == 2) {
2285                         /* verify that password entered correctly */
2286                         if (!resp[i - 1].resp ||
2287                             strcmp(token, resp[i - 1].resp)) {
2288                                 _pam_delete(token);     /* mistyped */
2289                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2290                                 _make_remark(ctx, PAM_ERROR_MSG,
2291                                              MISTYPED_PASS);
2292                         }
2293                 }
2294
2295                 /*
2296                  * tidy up the conversation (resp_retcode) is ignored
2297                  * -- what is it for anyway? AGM
2298                  */
2299                 _pam_drop_reply(resp, i);
2300         }
2301
2302  done:
2303         if (retval != PAM_SUCCESS) {
2304                 _pam_log_debug(ctx, LOG_DEBUG,
2305                                "unable to obtain a password");
2306                 return retval;
2307         }
2308         /* 'token' is the entered password */
2309
2310         /* we store this password as an item */
2311
2312         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2313         _pam_delete(token);     /* clean it up */
2314         if (retval != PAM_SUCCESS ||
2315             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2316
2317                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2318                 return retval;
2319
2320         }
2321
2322         *pass = item;
2323         item = NULL;            /* break link to password */
2324
2325         return PAM_SUCCESS;
2326 }
2327
2328 static const char *get_conf_item_string(struct pwb_context *ctx,
2329                                         const char *item,
2330                                         int config_flag)
2331 {
2332         int i = 0;
2333         const char *parm_opt = NULL;
2334
2335         if (!(ctx->ctrl & config_flag)) {
2336                 goto out;
2337         }
2338
2339         /* let the pam opt take precedence over the pam_winbind.conf option */
2340         for (i=0; i<ctx->argc; i++) {
2341
2342                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2343                         char *p;
2344
2345                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2346                                 _pam_log(ctx, LOG_INFO,
2347                                          "no \"=\" delimiter for \"%s\" found\n",
2348                                          item);
2349                                 goto out;
2350                         }
2351                         _pam_log_debug(ctx, LOG_INFO,
2352                                        "PAM config: %s '%s'\n", item, p+1);
2353                         return p + 1;
2354                 }
2355         }
2356
2357         if (ctx->dict) {
2358                 char *key = NULL;
2359
2360                 key = talloc_asprintf(ctx, "global:%s", item);
2361                 if (!key) {
2362                         goto out;
2363                 }
2364
2365                 parm_opt = tiniparser_getstring_nonempty(ctx->dict, key, NULL);
2366                 TALLOC_FREE(key);
2367
2368                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2369                                item, parm_opt);
2370         }
2371 out:
2372         return parm_opt;
2373 }
2374
2375 static int get_config_item_int(struct pwb_context *ctx,
2376                                const char *item,
2377                                int config_flag)
2378 {
2379         int i, parm_opt = -1;
2380
2381         if (!(ctx->ctrl & config_flag)) {
2382                 goto out;
2383         }
2384
2385         /* let the pam opt take precedence over the pam_winbind.conf option */
2386         for (i = 0; i < ctx->argc; i++) {
2387
2388                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2389                         char *p;
2390
2391                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2392                                 _pam_log(ctx, LOG_INFO,
2393                                          "no \"=\" delimiter for \"%s\" found\n",
2394                                          item);
2395                                 goto out;
2396                         }
2397                         parm_opt = atoi(p + 1);
2398                         _pam_log_debug(ctx, LOG_INFO,
2399                                        "PAM config: %s '%d'\n",
2400                                        item, parm_opt);
2401                         return parm_opt;
2402                 }
2403         }
2404
2405         if (ctx->dict) {
2406                 char *key = NULL;
2407
2408                 key = talloc_asprintf(ctx, "global:%s", item);
2409                 if (!key) {
2410                         goto out;
2411                 }
2412
2413                 parm_opt = tiniparser_getint(ctx->dict, key, -1);
2414                 TALLOC_FREE(key);
2415
2416                 _pam_log_debug(ctx, LOG_INFO,
2417                                "CONFIG file: %s '%d'\n",
2418                                item, parm_opt);
2419         }
2420 out:
2421         return parm_opt;
2422 }
2423
2424 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2425 {
2426         return get_conf_item_string(ctx, "krb5_ccache_type",
2427                                     WINBIND_KRB5_CCACHE_TYPE);
2428 }
2429
2430 static const char *get_member_from_config(struct pwb_context *ctx)
2431 {
2432         const char *ret = NULL;
2433         ret = get_conf_item_string(ctx, "require_membership_of",
2434                                    WINBIND_REQUIRED_MEMBERSHIP);
2435         if (ret != NULL) {
2436                 return ret;
2437         }
2438         return get_conf_item_string(ctx, "require-membership-of",
2439                                     WINBIND_REQUIRED_MEMBERSHIP);
2440 }
2441
2442 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2443 {
2444         int ret;
2445         ret = get_config_item_int(ctx, "warn_pwd_expire",
2446                                   WINBIND_WARN_PWD_EXPIRE);
2447         /* no or broken setting */
2448         if (ret < 0) {
2449                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2450         }
2451         return ret;
2452 }
2453
2454 /**
2455  * Retrieve the winbind separator.
2456  *
2457  * @param ctx PAM winbind context.
2458  *
2459  * @return string separator character. NULL on failure.
2460  */
2461
2462 static char winbind_get_separator(struct pwb_context *ctx)
2463 {
2464         wbcErr wbc_status;
2465         static struct wbcInterfaceDetails *details = NULL;
2466         char result;
2467
2468         wbc_status = wbcCtxInterfaceDetails(ctx->wbc_ctx, &details);
2469         if (!WBC_ERROR_IS_OK(wbc_status)) {
2470                 _pam_log(ctx, LOG_ERR,
2471                          "Could not retrieve winbind interface details: %s",
2472                          wbcErrorString(wbc_status));
2473                 return '\0';
2474         }
2475
2476         if (!details) {
2477                 return '\0';
2478         }
2479
2480         result = details->winbind_separator;
2481         wbcFreeMemory(details);
2482         return result;
2483 }
2484
2485
2486 /**
2487  * Convert a upn to a name.
2488  *
2489  * @param ctx PAM winbind context.
2490  * @param upn  User UPN to be translated.
2491  *
2492  * @return converted name. NULL pointer on failure. Caller needs to free.
2493  */
2494
2495 static char* winbind_upn_to_username(struct pwb_context *ctx,
2496                                      const char *upn)
2497 {
2498         char sep;
2499         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2500         struct wbcDomainSid sid;
2501         enum wbcSidType type;
2502         char *domain = NULL;
2503         char *name;
2504         char *p;
2505         char *result;
2506
2507         /* This cannot work when the winbind separator = @ */
2508
2509         sep = winbind_get_separator(ctx);
2510         if (!sep || sep == '@') {
2511                 return NULL;
2512         }
2513
2514         name = talloc_strdup(ctx, upn);
2515         if (!name) {
2516                 return NULL;
2517         }
2518
2519         p = strchr(name, '@');
2520         if (p == NULL) {
2521                 TALLOC_FREE(name);
2522                 return NULL;
2523         }
2524         *p = '\0';
2525         domain = p + 1;
2526
2527         /* Convert the UPN to a SID */
2528
2529         wbc_status = wbcCtxLookupName(ctx->wbc_ctx, domain, name, &sid, &type);
2530         if (!WBC_ERROR_IS_OK(wbc_status)) {
2531                 return NULL;
2532         }
2533
2534         /* Convert the the SID back to the sAMAccountName */
2535
2536         wbc_status = wbcCtxLookupSid(ctx->wbc_ctx, &sid, &domain, &name, &type);
2537         if (!WBC_ERROR_IS_OK(wbc_status)) {
2538                 return NULL;
2539         }
2540
2541         result = talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2542         wbcFreeMemory(domain);
2543         wbcFreeMemory(name);
2544         return result;
2545 }
2546
2547 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2548                             int argc, enum pam_winbind_request_type type,
2549                             const char **argv)
2550 {
2551         int retval = PAM_SUCCESS;
2552         struct pwb_context *ctx = NULL;
2553         struct wbcLogoffUserParams logoff;
2554         struct wbcAuthErrorInfo *error = NULL;
2555         const char *user;
2556         wbcErr wbc_status = WBC_ERR_SUCCESS;
2557
2558         ZERO_STRUCT(logoff);
2559
2560         retval = _pam_winbind_init_context(pamh, flags, argc, argv, type, &ctx);
2561         if (retval != PAM_SUCCESS) {
2562                 return retval;
2563         }
2564
2565         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2566
2567         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2568
2569                 /* destroy the ccache here */
2570
2571                 uint32_t wbc_flags = 0;
2572                 const char *ccname = NULL;
2573                 struct passwd *pwd = NULL;
2574
2575                 retval = pam_get_user(pamh, &user, _("Username: "));
2576                 if (retval != PAM_SUCCESS) {
2577                         _pam_log(ctx, LOG_ERR,
2578                                  "could not identify user");
2579                         goto out;
2580                 }
2581
2582                 if (user == NULL) {
2583                         _pam_log(ctx, LOG_ERR,
2584                                  "username was NULL!");
2585                         retval = PAM_USER_UNKNOWN;
2586                         goto out;
2587                 }
2588
2589                 _pam_log_debug(ctx, LOG_DEBUG,
2590                                "username [%s] obtained", user);
2591
2592                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2593                 if (ccname == NULL) {
2594                         _pam_log_debug(ctx, LOG_DEBUG,
2595                                        "user has no KRB5CCNAME environment");
2596                 }
2597
2598                 pwd = getpwnam(user);
2599                 if (pwd == NULL) {
2600                         retval = PAM_USER_UNKNOWN;
2601                         goto out;
2602                 }
2603
2604                 wbc_flags = WBFLAG_PAM_KRB5 |
2605                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2606
2607                 logoff.username         = user;
2608
2609                 if (ccname) {
2610                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2611                                                      &logoff.blobs,
2612                                                      "ccfilename",
2613                                                      0,
2614                                                      discard_const_p(uint8_t, ccname),
2615                                                      strlen(ccname)+1);
2616                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2617                                 goto out;
2618                         }
2619                 }
2620
2621                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2622                                              &logoff.blobs,
2623                                              "flags",
2624                                              0,
2625                                              (uint8_t *)&wbc_flags,
2626                                              sizeof(wbc_flags));
2627                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2628                         goto out;
2629                 }
2630
2631                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2632                                              &logoff.blobs,
2633                                              "user_uid",
2634                                              0,
2635                                              (uint8_t *)&pwd->pw_uid,
2636                                              sizeof(pwd->pw_uid));
2637                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2638                         goto out;
2639                 }
2640
2641                 wbc_status = wbcCtxLogoffUserEx(ctx->wbc_ctx, &logoff, &error);
2642                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2643                                                      user, "wbcLogoffUser");
2644                 wbcFreeMemory(logoff.blobs);
2645                 logoff.blobs = NULL;
2646
2647                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2648                         _pam_log(ctx, LOG_INFO,
2649                                  "failed to logoff user %s: %s\n",
2650                                          user, wbcErrorString(wbc_status));
2651                 }
2652         }
2653
2654 out:
2655         if (logoff.blobs) {
2656                 wbcFreeMemory(logoff.blobs);
2657         }
2658
2659         if (!WBC_ERROR_IS_OK(wbc_status)) {
2660                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2661                      user, "wbcLogoffUser");
2662         }
2663         wbcFreeMemory(error);
2664
2665         /*
2666          * Delete the krb5 ccname variable from the PAM environment
2667          * if it was set by winbind.
2668          */
2669         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2670                 pam_putenv(pamh, "KRB5CCNAME");
2671         }
2672
2673         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2674
2675         TALLOC_FREE(ctx);
2676
2677         return retval;
2678 }
2679
2680 #ifdef SECURITY_OPENPAM_H_INCLUDED
2681 /*
2682  * Logic below is copied from openpam_check_error_code() in
2683  *./contrib/openpam/lib/libpam/openpam_dispatch.c on FreeBSD.
2684  */
2685 static int openpam_convert_error_code(struct pwb_context *ctx,
2686                                       enum pam_winbind_request_type req,
2687                                       int r)
2688 {
2689         if (r == PAM_SUCCESS ||
2690             r == PAM_SYSTEM_ERR ||
2691             r == PAM_SERVICE_ERR ||
2692             r == PAM_BUF_ERR ||
2693             r == PAM_CONV_ERR ||
2694             r == PAM_PERM_DENIED ||
2695             r == PAM_ABORT) {
2696                 return r;
2697         }
2698
2699         /* specific winbind request types */
2700         switch (req) {
2701         case PAM_WINBIND_AUTHENTICATE:
2702                 if (r == PAM_AUTH_ERR ||
2703                     r == PAM_CRED_INSUFFICIENT ||
2704                     r == PAM_AUTHINFO_UNAVAIL ||
2705                     r == PAM_USER_UNKNOWN ||
2706                     r == PAM_MAXTRIES) {
2707                         return r;
2708                 }
2709                 break;
2710         case PAM_WINBIND_SETCRED:
2711                 if (r == PAM_CRED_UNAVAIL ||
2712                     r == PAM_CRED_EXPIRED ||
2713                     r == PAM_USER_UNKNOWN ||
2714                     r == PAM_CRED_ERR) {
2715                         return r;
2716                 }
2717                 break;
2718         case PAM_WINBIND_ACCT_MGMT:
2719                 if (r == PAM_USER_UNKNOWN ||
2720                     r == PAM_AUTH_ERR ||
2721                     r == PAM_NEW_AUTHTOK_REQD ||
2722                     r == PAM_ACCT_EXPIRED) {
2723                         return r;
2724                 }
2725                 break;
2726         case PAM_WINBIND_OPEN_SESSION:
2727         case PAM_WINBIND_CLOSE_SESSION:
2728                 if (r == PAM_SESSION_ERR) {
2729                         return r;
2730                 }
2731                 break;
2732         case PAM_WINBIND_CHAUTHTOK:
2733                 if (r == PAM_PERM_DENIED ||
2734                     r == PAM_AUTHTOK_ERR ||
2735                     r == PAM_AUTHTOK_RECOVERY_ERR ||
2736                     r == PAM_AUTHTOK_LOCK_BUSY ||
2737                     r == PAM_AUTHTOK_DISABLE_AGING ||
2738                     r == PAM_TRY_AGAIN) {
2739                         return r;
2740                 }
2741                 break;
2742         default:
2743                 break;
2744         }
2745         _pam_log(ctx, LOG_INFO,
2746                  "Converting PAM error [%d] to PAM_SERVICE_ERR.\n", r);
2747         return PAM_SERVICE_ERR;
2748 };
2749 #define pam_error_code(a, b, c) openpam_convert_error_code(a, b, c)
2750 #else
2751 #define pam_error_code(a, b, c) (c)
2752 #endif
2753
2754 _PUBLIC_ PAM_EXTERN
2755 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2756                         int argc, const char **argv)
2757 {
2758         const char *username;
2759         const char *password;
2760         const char *member = NULL;
2761         const char *cctype = NULL;
2762         int warn_pwd_expire;
2763         int retval = PAM_AUTH_ERR;
2764         char *username_ret = NULL;
2765         char *new_authtok_required = NULL;
2766         char *real_username = NULL;
2767         struct pwb_context *ctx = NULL;
2768
2769         retval = _pam_winbind_init_context(pamh, flags, argc, argv,
2770                                            PAM_WINBIND_AUTHENTICATE, &ctx);
2771         if (retval != PAM_SUCCESS) {
2772                 return retval;
2773         }
2774
2775         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2776
2777         /* Get the username */
2778         retval = pam_get_user(pamh, &username, NULL);
2779         if ((retval != PAM_SUCCESS) || (!username)) {
2780                 _pam_log_debug(ctx, LOG_DEBUG,
2781                                "can not get the username");
2782                 retval = PAM_SERVICE_ERR;
2783                 goto out;
2784         }
2785
2786
2787 #if defined(AIX)
2788         /* Decode the user name since AIX does not support logn user
2789            names by default.  The name is encoded as _#uid.  */
2790
2791         if (username[0] == '_') {
2792                 uid_t id = atoi(&username[1]);
2793                 struct passwd *pw = NULL;
2794
2795                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2796                         real_username = strdup(pw->pw_name);
2797                 }
2798         }
2799 #endif
2800
2801         if (!real_username) {
2802                 /* Just making a copy of the username we got from PAM */
2803                 if ((real_username = strdup(username)) == NULL) {
2804                         _pam_log_debug(ctx, LOG_DEBUG,
2805                                        "memory allocation failure when copying "
2806                                        "username");
2807                         retval = PAM_SERVICE_ERR;
2808                         goto out;
2809                 }
2810         }
2811
2812         /* Maybe this was a UPN */
2813
2814         if (strchr(real_username, '@') != NULL) {
2815                 char *samaccountname = NULL;
2816
2817                 samaccountname = winbind_upn_to_username(ctx,
2818                                                          real_username);
2819                 if (samaccountname) {
2820                         free(real_username);
2821                         real_username = strdup(samaccountname);
2822                 }
2823         }
2824
2825         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2826                                         _("Password: "), NULL,
2827                                         &password);
2828
2829         if (retval != PAM_SUCCESS) {
2830                 _pam_log(ctx, LOG_ERR,
2831                          "Could not retrieve user's password");
2832                 retval = PAM_AUTHTOK_ERR;
2833                 goto out;
2834         }
2835
2836         /* Let's not give too much away in the log file */
2837
2838 #ifdef DEBUG_PASSWORD
2839         _pam_log_debug(ctx, LOG_INFO,
2840                        "Verify user '%s' with password '%s'",
2841                        real_username, password);
2842 #else
2843         _pam_log_debug(ctx, LOG_INFO,
2844                        "Verify user '%s'", real_username);
2845 #endif
2846
2847         member = get_member_from_config(ctx);
2848         cctype = get_krb5_cc_type_from_config(ctx);
2849         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2850
2851         /* Now use the username to look up password */
2852         retval = winbind_auth_request(ctx, real_username, password,
2853                                       member, cctype, warn_pwd_expire,
2854                                       NULL, NULL, NULL, &username_ret);
2855
2856         if (retval == PAM_NEW_AUTHTOK_REQD ||
2857             retval == PAM_AUTHTOK_EXPIRED) {
2858
2859                 char *new_authtok_required_during_auth = NULL;
2860
2861                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2862                 if (!new_authtok_required) {
2863                         retval = PAM_BUF_ERR;
2864                         goto out;
2865                 }
2866
2867                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2868                              new_authtok_required,
2869                              _pam_winbind_cleanup_func);
2870
2871                 retval = PAM_SUCCESS;
2872
2873                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2874                 if (!new_authtok_required_during_auth) {
2875                         retval = PAM_BUF_ERR;
2876                         goto out;
2877                 }
2878
2879                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2880                              new_authtok_required_during_auth,
2881                              _pam_winbind_cleanup_func);
2882
2883                 goto out;
2884         }
2885
2886 out:
2887         if (username_ret) {
2888                 pam_set_item (pamh, PAM_USER, username_ret);
2889                 _pam_log_debug(ctx, LOG_INFO,
2890                                "Returned user was '%s'", username_ret);
2891                 free(username_ret);
2892         }
2893
2894         if (real_username) {
2895                 free(real_username);
2896         }
2897
2898         if (!new_authtok_required) {
2899                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2900         }
2901
2902         if (retval != PAM_SUCCESS) {
2903                 _pam_free_data_info3(pamh);
2904         }
2905
2906         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2907
2908         TALLOC_FREE(ctx);
2909
2910         return retval;
2911 }
2912
2913 _PUBLIC_ PAM_EXTERN
2914 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2915                    int argc, const char **argv)
2916 {
2917         int ret = PAM_SYSTEM_ERR;
2918         struct pwb_context *ctx = NULL;
2919
2920         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2921                                         PAM_WINBIND_SETCRED, &ctx);
2922         if (ret != PAM_SUCCESS) {
2923                 return ret;
2924         }
2925
2926         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2927
2928         switch (flags & ~PAM_SILENT) {
2929
2930                 case PAM_DELETE_CRED:
2931                         ret = _pam_delete_cred(pamh, flags, argc,
2932                                                PAM_WINBIND_SETCRED, argv);
2933                         break;
2934                 case PAM_REFRESH_CRED:
2935                         _pam_log_debug(ctx, LOG_WARNING,
2936                                        "PAM_REFRESH_CRED not implemented");
2937                         ret = PAM_SUCCESS;
2938                         break;
2939                 case PAM_REINITIALIZE_CRED:
2940                         _pam_log_debug(ctx, LOG_WARNING,
2941                                        "PAM_REINITIALIZE_CRED not implemented");
2942                         ret = PAM_SUCCESS;
2943                         break;
2944                 case PAM_ESTABLISH_CRED:
2945                         _pam_log_debug(ctx, LOG_WARNING,
2946                                        "PAM_ESTABLISH_CRED not implemented");
2947                         ret = PAM_SUCCESS;
2948                         break;
2949                 default:
2950                         ret = PAM_SYSTEM_ERR;
2951                         break;
2952         }
2953
2954         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2955
2956         TALLOC_FREE(ctx);
2957
2958         return pam_error_code(ctx, PAM_WINBIND_SETCRED, ret);
2959 }
2960
2961 /*
2962  * Account management. We want to verify that the account exists
2963  * before returning PAM_SUCCESS
2964  */
2965 _PUBLIC_ PAM_EXTERN
2966 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2967                    int argc, const char **argv)
2968 {
2969         const char *username;
2970         int ret = PAM_USER_UNKNOWN;
2971         const char *tmp = NULL;
2972         struct pwb_context *ctx = NULL;
2973
2974         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2975                                         PAM_WINBIND_ACCT_MGMT, &ctx);
2976         if (ret != PAM_SUCCESS) {
2977                 return ret;
2978         }
2979
2980         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2981
2982
2983         /* Get the username */
2984         ret = pam_get_user(pamh, &username, NULL);
2985         if ((ret != PAM_SUCCESS) || (!username)) {
2986                 _pam_log_debug(ctx, LOG_DEBUG,
2987                                "can not get the username");
2988                 ret = PAM_SERVICE_ERR;
2989                 goto out;
2990         }
2991
2992         /* Verify the username */
2993         ret = valid_user(ctx, username);
2994         switch (ret) {
2995         case -1:
2996                 /* some sort of system error. The log was already printed */
2997                 ret = PAM_SERVICE_ERR;
2998                 goto out;
2999         case 1:
3000                 /* the user does not exist */
3001                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
3002                                username);
3003                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
3004                         ret = PAM_IGNORE;
3005                         goto out;
3006                 }
3007                 ret = PAM_USER_UNKNOWN;
3008                 goto out;
3009         case 0:
3010                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
3011                              (const void **)&tmp);
3012                 if (tmp != NULL) {
3013                         ret = atoi(tmp);
3014                         switch (ret) {
3015                         case PAM_AUTHTOK_EXPIRED:
3016                                 /* Since new token is required in this case */
3017                                 FALL_THROUGH;
3018                         case PAM_NEW_AUTHTOK_REQD:
3019                                 _pam_log(ctx, LOG_WARNING,
3020                                          "pam_sm_acct_mgmt success but %s is set",
3021                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
3022                                 _pam_log(ctx, LOG_NOTICE,
3023                                          "user '%s' needs new password",
3024                                          username);
3025                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
3026                                 ret = PAM_NEW_AUTHTOK_REQD;
3027                                 goto out;
3028                         default:
3029                                 _pam_log(ctx, LOG_WARNING,
3030                                          "pam_sm_acct_mgmt success");
3031                                 _pam_log(ctx, LOG_NOTICE,
3032                                          "user '%s' granted access", username);
3033                                 ret = PAM_SUCCESS;
3034                                 goto out;
3035                         }
3036                 }
3037
3038                 /* Otherwise, the authentication looked good */
3039                 _pam_log(ctx, LOG_NOTICE,
3040                          "user '%s' granted access", username);
3041                 ret = PAM_SUCCESS;
3042                 goto out;
3043         default:
3044                 /* we don't know anything about this return value */
3045                 _pam_log(ctx, LOG_ERR,
3046                          "internal module error (ret = %d, user = '%s')",
3047                          ret, username);
3048                 ret = PAM_SERVICE_ERR;
3049                 goto out;
3050         }
3051
3052         /* should not be reached */
3053         ret = PAM_IGNORE;
3054
3055  out:
3056
3057         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
3058
3059         TALLOC_FREE(ctx);
3060
3061         return pam_error_code(ctx, PAM_WINBIND_ACCT_MGMT, ret);
3062 }
3063
3064 _PUBLIC_ PAM_EXTERN
3065 int pam_sm_open_session(pam_handle_t *pamh, int flags,
3066                         int argc, const char **argv)
3067 {
3068         int ret = PAM_SUCCESS;
3069         struct pwb_context *ctx = NULL;
3070
3071         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3072                                         PAM_WINBIND_OPEN_SESSION, &ctx);
3073         if (ret != PAM_SUCCESS) {
3074                 return ret;
3075         }
3076
3077         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
3078
3079         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
3080                 /* check and create homedir */
3081                 ret = _pam_mkhomedir(ctx);
3082         }
3083
3084         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
3085
3086         TALLOC_FREE(ctx);
3087
3088         return pam_error_code(ctx, PAM_WINBIND_OPEN_SESSION, ret);
3089 }
3090
3091 _PUBLIC_ PAM_EXTERN
3092 int pam_sm_close_session(pam_handle_t *pamh, int flags,
3093                          int argc, const char **argv)
3094 {
3095         int ret = PAM_SUCCESS;
3096         struct pwb_context *ctx = NULL;
3097
3098         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3099                                         PAM_WINBIND_CLOSE_SESSION, &ctx);
3100         if (ret != PAM_SUCCESS) {
3101                 return ret;
3102         }
3103
3104         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
3105
3106         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
3107
3108         TALLOC_FREE(ctx);
3109
3110         return pam_error_code(ctx, PAM_WINBIND_CLOSE_SESSION, ret);
3111 }
3112
3113 /**
3114  * evaluate whether we need to re-authenticate with kerberos after a
3115  * password change
3116  *
3117  * @param ctx PAM winbind context.
3118  * @param user The username
3119  *
3120  * @return boolean Returns true if required, false if not.
3121  */
3122
3123 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
3124                                                    const char *user)
3125 {
3126
3127         /* Make sure that we only do this if a) the chauthtok got initiated
3128          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
3129          * later password change via the "passwd" command if done by the user
3130          * itself
3131          * NB. If we login from gdm or xdm and the password expires,
3132          * we change the password, but there is no memory cache.
3133          * Thus, even for passthrough login, we should do the
3134          * authentication again to update memory cache.
3135          * --- BoYang
3136          * */
3137
3138         const char *new_authtok_reqd_during_auth = NULL;
3139         struct passwd *pwd = NULL;
3140
3141         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3142                       (const void **) &new_authtok_reqd_during_auth);
3143         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3144                      NULL, NULL);
3145
3146         if (new_authtok_reqd_during_auth) {
3147                 return true;
3148         }
3149
3150         pwd = getpwnam(user);
3151         if (!pwd) {
3152                 return false;
3153         }
3154
3155         if (getuid() == pwd->pw_uid) {
3156                 return true;
3157         }
3158
3159         return false;
3160 }
3161
3162
3163 _PUBLIC_ PAM_EXTERN
3164 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3165                      int argc, const char **argv)
3166 {
3167         unsigned int lctrl;
3168         int ret;
3169         bool cached_login = false;
3170
3171         /* <DO NOT free() THESE> */
3172         const char *user;
3173         const char *pass_old;
3174         const char *pass_new;
3175         /* </DO NOT free() THESE> */
3176
3177         char *Announce;
3178
3179         int retry = 0;
3180         char *username_ret = NULL;
3181         struct wbcAuthErrorInfo *error = NULL;
3182         struct pwb_context *ctx = NULL;
3183
3184         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3185                                         PAM_WINBIND_CHAUTHTOK, &ctx);
3186         if (ret != PAM_SUCCESS) {
3187                 return ret;
3188         }
3189
3190         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3191
3192         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3193
3194         /* clearing offline bit for auth */
3195         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3196
3197         /*
3198          * First get the name of a user
3199          */
3200         ret = pam_get_user(pamh, &user, _("Username: "));
3201         if (ret != PAM_SUCCESS) {
3202                 _pam_log(ctx, LOG_ERR,
3203                          "password - could not identify user");
3204                 goto out;
3205         }
3206
3207         if (user == NULL) {
3208                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3209                 ret = PAM_USER_UNKNOWN;
3210                 goto out;
3211         }
3212
3213         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3214
3215         /* check if this is really a user in winbindd, not only in NSS */
3216         ret = valid_user(ctx, user);
3217         switch (ret) {
3218                 case 1:
3219                         ret = PAM_USER_UNKNOWN;
3220                         goto out;
3221                 case -1:
3222                         ret = PAM_SYSTEM_ERR;
3223                         goto out;
3224                 default:
3225                         break;
3226         }
3227
3228         /*
3229          * obtain and verify the current password (OLDAUTHTOK) for
3230          * the user.
3231          */
3232
3233         if (flags & PAM_PRELIM_CHECK) {
3234                 time_t *pwdlastset_prelim = NULL;
3235
3236                 pwdlastset_prelim = talloc_zero(NULL, time_t);
3237                 if (pwdlastset_prelim == NULL) {
3238                         _pam_log(ctx, LOG_CRIT,
3239                                  "password - out of memory");
3240                         ret = PAM_BUF_ERR;
3241                         goto out;
3242                 }
3243
3244                 /* instruct user what is happening */
3245
3246 #define greeting _("Changing password for")
3247                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3248                 if (!Announce) {
3249                         _pam_log(ctx, LOG_CRIT,
3250                                  "password - out of memory");
3251                         ret = PAM_BUF_ERR;
3252                         goto out;
3253                 }
3254 #undef greeting
3255
3256                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3257                 ret = _winbind_read_password(ctx, lctrl,
3258                                                 Announce,
3259                                                 _("(current) NT password: "),
3260                                                 NULL,
3261                                                 (const char **) &pass_old);
3262                 TALLOC_FREE(Announce);
3263                 if (ret != PAM_SUCCESS) {
3264                         _pam_log(ctx, LOG_NOTICE,
3265                                  "password - (old) token not obtained");
3266                         goto out;
3267                 }
3268
3269                 /* verify that this is the password for this user */
3270
3271                 ret = winbind_auth_request(ctx, user, pass_old,
3272                                            NULL, NULL, 0,
3273                                            &error, NULL,
3274                                            pwdlastset_prelim, NULL);
3275
3276                 if (ret != PAM_ACCT_EXPIRED &&
3277                     ret != PAM_AUTHTOK_EXPIRED &&
3278                     ret != PAM_NEW_AUTHTOK_REQD &&
3279                     ret != PAM_SUCCESS) {
3280                         pass_old = NULL;
3281                         goto out;
3282                 }
3283
3284                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3285                              pwdlastset_prelim,
3286                              _pam_winbind_cleanup_func);
3287
3288                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3289                                    (const void *) pass_old);
3290                 pass_old = NULL;
3291                 if (ret != PAM_SUCCESS) {
3292                         _pam_log(ctx, LOG_CRIT,
3293                                  "failed to set PAM_OLDAUTHTOK");
3294                 }
3295         } else if (flags & PAM_UPDATE_AUTHTOK) {
3296                 const time_t *pwdlastset_update = NULL;
3297
3298                 /*
3299                  * obtain the proposed password
3300                  */
3301
3302                 /*
3303                  * get the old token back.
3304                  */
3305
3306                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3307
3308                 if (ret != PAM_SUCCESS) {
3309                         _pam_log(ctx, LOG_NOTICE,
3310                                  "user not authenticated");
3311                         goto out;
3312                 }
3313
3314                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3315
3316                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3317                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3318                 }
3319                 if (on(WINBIND_TRY_AUTHTOK_ARG, lctrl)) {
3320                         lctrl |= WINBIND_TRY_FIRST_PASS_ARG;
3321                 }
3322                 retry = 0;
3323                 ret = PAM_AUTHTOK_ERR;
3324                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3325                         /*
3326                          * use_authtok is to force the use of a previously entered
3327                          * password -- needed for pluggable password strength checking
3328                          */
3329
3330                         ret = _winbind_read_password(ctx, lctrl,
3331                                                      NULL,
3332                                                      _("Enter new NT password: "),
3333                                                      _("Retype new NT password: "),
3334                                                      (const char **)&pass_new);
3335
3336                         if (ret != PAM_SUCCESS) {
3337                                 _pam_log_debug(ctx, LOG_ALERT,
3338                                                "password - "
3339                                                "new password not obtained");
3340                                 pass_old = NULL;/* tidy up */
3341                                 goto out;
3342                         }
3343
3344                         /*
3345                          * At this point we know who the user is and what they
3346                          * propose as their new password. Verify that the new
3347                          * password is acceptable.
3348                          */
3349
3350                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3351                                 pass_new = NULL;
3352                         }
3353                 }
3354
3355                 /*
3356                  * By reaching here we have approved the passwords and must now
3357                  * rebuild the password database file.
3358                  */
3359                 pam_get_data(pamh,
3360                              PAM_WINBIND_PWD_LAST_SET,
3361                              (const void **)(&pwdlastset_update));
3362
3363                 /*
3364                  * if cached creds were enabled, make sure to set the
3365                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3366                  * update the cached creds storage - gd
3367                  */
3368                 if (cached_login) {
3369                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3370                 }
3371
3372                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3373                                                 pass_new, *pwdlastset_update);
3374                 if (ret != PAM_SUCCESS) {
3375                         pass_old = pass_new = NULL;
3376                         goto out;
3377                 }
3378
3379                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3380
3381                         const char *member = NULL;
3382                         const char *cctype = NULL;
3383                         int warn_pwd_expire;
3384                         struct wbcLogonUserInfo *info = NULL;
3385
3386                         member = get_member_from_config(ctx);
3387                         cctype = get_krb5_cc_type_from_config(ctx);
3388                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3389
3390                         /* Keep WINBIND_CACHED_LOGIN bit for
3391                          * authentication after changing the password.
3392                          * This will update the cached credentials in case
3393                          * that winbindd_dual_pam_chauthtok() fails
3394                          * to update them.
3395                          * --- BoYang
3396                          * */
3397
3398                         ret = winbind_auth_request(ctx, user, pass_new,
3399                                                    member, cctype, 0,
3400                                                    &error, &info,
3401                                                    NULL, &username_ret);
3402                         pass_old = pass_new = NULL;
3403
3404                         if (ret == PAM_SUCCESS) {
3405
3406                                 struct wbcAuthUserInfo *user_info = NULL;
3407
3408                                 if (info && info->info) {
3409                                         user_info = info->info;
3410                                 }
3411
3412                                 /* warn a user if the password is about to
3413                                  * expire soon */
3414                                 _pam_warn_password_expiry(ctx, user_info,
3415                                                           warn_pwd_expire,
3416                                                           NULL, NULL);
3417
3418                                 /* set some info3 info for other modules in the
3419                                  * stack */
3420                                 _pam_set_data_info3(ctx, user_info);
3421
3422                                 /* put krb5ccname into env */
3423                                 _pam_setup_krb5_env(ctx, info);
3424
3425                                 if (username_ret) {
3426                                         pam_set_item(pamh, PAM_USER,
3427                                                      username_ret);
3428                                         _pam_log_debug(ctx, LOG_INFO,
3429                                                        "Returned user was '%s'",
3430                                                        username_ret);
3431                                         free(username_ret);
3432                                 }
3433
3434                         }
3435
3436                         if (info && info->blobs) {
3437                                 wbcFreeMemory(info->blobs);
3438                         }
3439                         wbcFreeMemory(info);
3440
3441                         goto out;
3442                 }
3443         } else {
3444                 ret = PAM_SERVICE_ERR;
3445         }
3446
3447 out:
3448         {
3449                 /* Deal with offline errors. */
3450                 int i;
3451                 const char *codes[] = {
3452                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3453                         "NT_STATUS_NO_LOGON_SERVERS",
3454                         "NT_STATUS_ACCESS_DENIED"
3455                 };
3456
3457                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3458                         int _ret;
3459                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3460                                 break;
3461                         }
3462                 }
3463         }
3464
3465         wbcFreeMemory(error);
3466
3467         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3468
3469         TALLOC_FREE(ctx);
3470
3471         return pam_error_code(ctx, PAM_WINBIND_CHAUTHTOK, ret);
3472 }
3473
3474 #ifdef PAM_STATIC
3475
3476 /* static module data */
3477
3478 struct pam_module _pam_winbind_modstruct = {
3479         MODULE_NAME,
3480         pam_sm_authenticate,
3481         pam_sm_setcred,
3482         pam_sm_acct_mgmt,
3483         pam_sm_open_session,
3484         pam_sm_close_session,
3485         pam_sm_chauthtok
3486 };
3487
3488 #endif
3489
3490 /*
3491  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3492  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3493  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3494  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3495  * Copyright (c) Jan Rêkorajski 1999.
3496  * Copyright (c) Andrew G. Morgan 1996-8.
3497  * Copyright (c) Alex O. Yuriev, 1996.
3498  * Copyright (c) Cristian Gafton 1996.
3499  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3500  *
3501  * Redistribution and use in source and binary forms, with or without
3502  * modification, are permitted provided that the following conditions
3503  * are met:
3504  * 1. Redistributions of source code must retain the above copyright
3505  *    notice, and the entire permission notice in its entirety,
3506  *    including the disclaimer of warranties.
3507  * 2. Redistributions in binary form must reproduce the above copyright
3508  *    notice, this list of conditions and the following disclaimer in the
3509  *    documentation and/or other materials provided with the distribution.
3510  * 3. The name of the author may not be used to endorse or promote
3511  *    products derived from this software without specific prior
3512  *    written permission.
3513  *
3514  * ALTERNATIVELY, this product may be distributed under the terms of
3515  * the GNU Public License, in which case the provisions of the GPL are
3516  * required INSTEAD OF the above restrictions.  (This clause is
3517  * necessary due to a potential bad interaction between the GPL and
3518  * the restrictions contained in a BSD-style copyright.)
3519  *
3520  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3521  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3522  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3523  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3524  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3525  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3526  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3527  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3528  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3529  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3530  * OF THE POSSIBILITY OF SUCH DAMAGE.
3531  */