usr.bin/passwd/yp_passwd.c

   1 /*      $NetBSD: yp_passwd.c,v 1.35 2010/09/08 13:58:46 christos Exp $  */
   2
   3 /*
   4  * Copyright (c) 1988, 1990, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "from:  @(#)local_passwd.c    8.3 (Berkeley) 4/2/94";
  36 #else
  37 __RCSID("$NetBSD: yp_passwd.c,v 1.35 2010/09/08 13:58:46 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #ifdef  YP
  42
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <netdb.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <time.h>
  52 #include <unistd.h>
  53 #include <limits.h>
  54 #include <util.h>
  55
  56 #include <rpc/rpc.h>
  57 #include <rpcsvc/yp_prot.h>
  58 #include <rpcsvc/ypclnt.h>
  59
  60 #include "extern.h"
  61
  62 #define passwd yp_passwd_rec
  63 #include <rpcsvc/yppasswd.h>
  64 #undef passwd
  65
  66 #ifndef _PASSWORD_LEN
  67 #define _PASSWORD_LEN PASS_MAX
  68 #endif
  69
  70 static uid_t uid;
  71 static char *domain;
  72
  73 static void
  74 pwerror(const char *name, int show_err, int eval)
  75 {
  76
  77         if (show_err)
  78                 warn("%s", name);
  79         errx(eval, "NIS passwd database unchanged");
  80 }
  81
  82 static char *
  83 getnewpasswd(struct passwd *pw, char **old_pass)
  84 {
  85         int tries;
  86         const char *p, *t;
  87         char *result;
  88         static char buf[_PASSWORD_LEN + 1];
  89         char salt[_PASSWORD_LEN + 1];
  90         char option[LINE_MAX], *key, *opt;
  91
  92         (void)printf("Changing NIS password for %s.\n", pw->pw_name);
  93
  94         if (old_pass) {
  95                 *old_pass = NULL;
  96
  97                 if (pw->pw_passwd[0]) {
  98                         if (strcmp(crypt(p = getpass("Old password:"),
  99                             pw->pw_passwd),  pw->pw_passwd)) {
 100                                 (void)printf("Sorry.\n");
 101                                 pwerror(NULL, 0, 1);
 102                         }
 103                 } else {
 104                         p = "";
 105                 }
 106
 107                 *old_pass = strdup(p);
 108                 if (!*old_pass) {
 109                         (void)printf("not enough core.\n");
 110                         pwerror(NULL, 0, 1);
 111                 }
 112         }
 113         for (buf[0] = '\0', tries = 0;;) {
 114                 p = getpass("New password:");
 115                 if (!*p) {
 116                         (void)printf("Password unchanged.\n");
 117                         pwerror(NULL, 0, 0);
 118                 }
 119                 if (strlen(p) <= 5 && ++tries < 2) {
 120                         (void)printf("Please enter a longer password.\n");
 121                         continue;
 122                 }
 123                 for (t = p; *t && islower((unsigned char)*t); ++t);
 124                 if (!*t && ++tries < 2) {
 125                         (void)printf("Please don't use an all-lower case "
 126                             "password.\nUnusual capitalization, "
 127                             "control characters or digits are "
 128                             "suggested.\n");
 129                         continue;
 130                 }
 131                 (void)strlcpy(buf, p, sizeof(buf));
 132                 if (!strcmp(buf, getpass("Retype new password:")))
 133                         break;
 134                 (void)printf("Mismatch; try again, EOF to quit.\n");
 135         }
 136
 137         pw_getpwconf(option, sizeof(option), pw, "ypcipher");
 138         opt = option;
 139         key = strsep(&opt, ",");
 140         if (pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) {
 141                 warn("Couldn't generate salt");
 142                 pwerror(NULL, 0, 0);
 143         }
 144         result = strdup(crypt(buf, salt));
 145         if (!result) {
 146                 (void)printf("not enough core.\n");
 147                 pwerror(NULL, 0, 0);
 148         }
 149         return result;
 150 }
 151
 152 static void
 153 makeypp(struct yppasswd *ypp, struct passwd *pw)
 154 {
 155         /* prompt for new password */
 156         ypp->newpw.pw_passwd = getnewpasswd(pw, &ypp->oldpass);
 157
 158         /* tell rpc.yppasswdd */
 159         ypp->newpw.pw_name      = estrdup(pw->pw_name);
 160         ypp->newpw.pw_uid       = pw->pw_uid;
 161         ypp->newpw.pw_gid       = pw->pw_gid;
 162         ypp->newpw.pw_gecos     = estrdup(pw->pw_gecos);
 163         ypp->newpw.pw_dir       = estrdup(pw->pw_dir);
 164         ypp->newpw.pw_shell     = estrdup(pw->pw_shell);
 165 }
 166
 167 static int
 168 ypgetpwnam(const char *nam, struct passwd *pwd)
 169 {
 170         char *val;
 171         int reason, vallen, namlen = (int)strlen(nam);
 172         int flags;
 173         int ok;
 174
 175         flags = ok = 0;
 176         val = NULL;
 177         reason = yp_match(domain, "master.passwd.byname", nam, namlen,
 178             &val, &vallen);
 179         if (reason == YPERR_MAP) {
 180                 reason = yp_match(domain, "passwd.byname", nam, namlen,
 181                     &val, &vallen);
 182                 flags = _PASSWORD_OLDFMT;
 183         }
 184         if (reason != 0)
 185                 goto out;
 186
 187         if (pw_scan(val, pwd, &flags) == 0)
 188                 goto out;
 189
 190         ok = 1;
 191         val = NULL;     /* Don't free the memory, it is still in use */
 192 out:
 193         if (val)
 194                 free(val);
 195         return ok;
 196 }
 197
 198 #ifdef USE_PAM
 199
 200 void
 201 pwyp_usage(const char *prefix)
 202 {
 203
 204         (void)fprintf(stderr, "%s %s [-d nis | -y] [user]\n",
 205             prefix, getprogname());
 206 }
 207
 208 void
 209 pwyp_argv0_usage(const char *prefix)
 210 {
 211
 212         (void)fprintf(stderr, "%s %s [user]\n",
 213             prefix, getprogname());
 214 }
 215
 216 void
 217 pwyp_process(const char *username, int argc, char **argv)
 218 {
 219         char *master;
 220         int ch, r, rpcport, status;
 221         enum clnt_stat yr;
 222         struct yppasswd ypp;
 223         struct passwd pwb, pwb2, *pw;
 224         char pwbuf[1024];
 225         struct timeval tv;
 226         CLIENT *client;
 227
 228         while ((ch = getopt(argc, argv, "y")) != -1) {
 229                 switch (ch) {
 230                 case 'y':
 231                         /*
 232                          * Abosrb the -y that may have gotten us here.
 233                          */
 234                         break;
 235
 236                 default:
 237                         usage();
 238                         /* NOTREACHED */
 239                 }
 240         }
 241
 242         argc -= optind;
 243         argv += optind;
 244
 245         switch (argc) {
 246         case 0:
 247                 /* username already provided */
 248                 break;
 249         case 1:
 250                 username = argv[0];
 251                 break;
 252         default:
 253                 usage();
 254                 /*NOTREACHED*/
 255         }
 256
 257         if (_yp_check(NULL) == 0) {
 258                 /* can't use YP. */
 259                 errx(EXIT_FAILURE, "NIS not in use.");
 260         }
 261
 262         uid = getuid();
 263
 264         /*
 265          * Get local domain
 266          */
 267         if ((r = yp_get_default_domain(&domain)) != 0)
 268                 errx(EXIT_FAILURE, "Can't get local NIS domain (%s)",
 269                     yperr_string(r));
 270
 271         /*
 272          * Find the host for the passwd map; it should be running
 273          * the daemon.
 274          */
 275         if ((r = yp_master(domain, "passwd.byname", &master)) != 0)
 276                 errx(EXIT_FAILURE, "Can't find the master NIS server (%s)",
 277                     yperr_string(r));
 278
 279         /*
 280          * Ask the portmapper for the port of the daemon.
 281          */
 282         if ((rpcport = getrpcport(master, YPPASSWDPROG,
 283             YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0)
 284                 errx(EXIT_FAILURE, "Master NIS server not running yppasswd "
 285                     "daemon");
 286
 287         /*
 288          * Be sure the port is privileged
 289          */
 290         if (rpcport >= IPPORT_RESERVED)
 291                 errx(EXIT_FAILURE, "Yppasswd daemon is on an invalid port");
 292
 293         /* Bail out if this is a local (non-yp) user, */
 294         /* then get user's login identity */
 295         if (!ypgetpwnam(username, &pwb) ||
 296             getpwnam_r(username, &pwb2, pwbuf, sizeof(pwbuf), &pw) ||
 297             pw == NULL)
 298                 errx(EXIT_FAILURE, "NIS unknown user %s", username);
 299
 300         if (uid && uid != pwb.pw_uid) {
 301                 errno = EACCES;
 302                 err(EXIT_FAILURE, "You may only change your own password");
 303         }
 304
 305         makeypp(&ypp, &pwb);
 306
 307         client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
 308         if (client == NULL)
 309                 errx(EXIT_FAILURE, "Cannot contact yppasswdd on %s (%s)",
 310                     master, yperr_string(YPERR_YPBIND));
 311
 312         client->cl_auth = authunix_create_default();
 313         tv.tv_sec = 2;
 314         tv.tv_usec = 0;
 315         yr = clnt_call(client, YPPASSWDPROC_UPDATE,
 316             xdr_yppasswd, &ypp, xdr_int, &status, tv);
 317         if (yr != RPC_SUCCESS)
 318                 errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
 319                     clnt_sperrno(yr));
 320         else if (status)
 321                 printf("Couldn't change NIS password.\n");
 322         else
 323                 printf("The NIS password has been changed on %s, %s\n",
 324                     master, "the master NIS passwd server.");
 325 }
 326
 327 #else /* ! USE_PAM */
 328
 329 static  int yflag;
 330
 331 int
 332 yp_init(progname)
 333         const char *progname;
 334 {
 335         int yppwd;
 336
 337         if (strcmp(progname, "yppasswd") == 0) {
 338                 yppwd = 1;
 339         } else
 340                 yppwd = 0;
 341         yflag = 0;
 342         if (_yp_check(NULL) == 0) {
 343                 /* can't use YP. */
 344                 if (yppwd)
 345                         errx(EXIT_FAILURE, "NIS not in use");
 346                 return -1;
 347         }
 348         return 0;
 349 }
 350
 351 int
 352 yp_arg(char ch, const char *arg)
 353 {
 354         switch (ch) {
 355         case 'y':
 356                 yflag = 1;
 357                 break;
 358         default:
 359                 return 0;
 360         }
 361         return 1;
 362 }
 363
 364 int
 365 yp_arg_end(void)
 366 {
 367         if (yflag)
 368                 return PW_USE_FORCE;
 369         return PW_USE;
 370 }
 371
 372 void
 373 yp_end(void)
 374 {
 375         /* NOOP */
 376 }
 377
 378 int
 379 yp_chpw(const char *username)
 380 {
 381         char *master;
 382         int r, rpcport, status;
 383         enum clnt_stat yr;
 384         struct yppasswd ypp;
 385         struct passwd *pw, pwb;
 386         char pwbuf[1024];
 387         struct timeval tv;
 388         CLIENT *client;
 389
 390         uid = getuid();
 391
 392         /*
 393          * Get local domain
 394          */
 395         if ((r = yp_get_default_domain(&domain)) != 0)
 396                 errx(EXIT_FAILURE, "can't get local NIS domain.  Reason: %s",
 397                     yperr_string(r));
 398
 399         /*
 400          * Find the host for the passwd map; it should be running
 401          * the daemon.
 402          */
 403         if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
 404                 warnx("can't find the master NIS server.  Reason: %s",
 405                     yperr_string(r));
 406                 /* continuation */
 407                 return -1;
 408         }
 409
 410         /*
 411          * Ask the portmapper for the port of the daemon.
 412          */
 413         if ((rpcport = getrpcport(master, YPPASSWDPROG,
 414             YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
 415                 warnx("Master NIS server not running yppasswd daemon");
 416                 /* continuation */
 417                 return -1;
 418         }
 419
 420         /*
 421          * Be sure the port is privileged
 422          */
 423         if (rpcport >= IPPORT_RESERVED)
 424                 errx(EXIT_FAILURE, "Yppasswd daemon is on an invalid port");
 425
 426         /* Bail out if this is a local (non-yp) user, */
 427         /* then get user's login identity */
 428         if (!ypgetpwnam(username, pw = &pwb) ||
 429             getpwnam_r(username, &pwb, pwbuf, sizeof(pwbuf), &pw) ||
 430             pw == NULL) {
 431                 warnx("NIS unknown user %s", username);
 432                 /* continuation */
 433                 return -1;
 434         }
 435
 436         if (uid && uid != pw->pw_uid) {
 437                 errno = EACCES;
 438                 err(EXIT_FAILURE, "You may only change your own password");
 439         }
 440
 441         makeypp(&ypp, pw);
 442
 443         client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
 444         if (client == NULL) {
 445                 warnx("Cannot contact yppasswdd on %s (%s)",
 446                     master, yperr_string(YPERR_YPBIND));
 447                 return YPERR_YPBIND;
 448         }
 449
 450         client->cl_auth = authunix_create_default();
 451         tv.tv_sec = 2;
 452         tv.tv_usec = 0;
 453         yr = clnt_call(client, YPPASSWDPROC_UPDATE,
 454             xdr_yppasswd, &ypp, xdr_int, &status, tv);
 455         if (yr != RPC_SUCCESS)
 456                 errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
 457                     clnt_sperrno(yr));
 458         else if (status)
 459                 printf("Couldn't change NIS password.\n");
 460         else
 461                 printf("The NIS password has been changed on %s, %s\n",
 462                     master, "the master NIS passwd server.");
 463         return 0;
 464 }
 465
 466 #endif /* USE_PAM */
 467
 468 #endif  /* YP */