lib/param/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2002
   6    Copyright (C) Simo Sorce 2001
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   8    Copyright (C) James J Myers 2003
   9    Copyright (C) Jelmer Vernooij 2005-2007
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "dynconfig/dynconfig.h"
  27 #include "system/network.h"
  28 #include "system/filesys.h"
  29 #include "system/dir.h"
  30 #include "param/param.h"
  31 #include "libds/common/roles.h"
  32 #include "tdb.h"
  33
  34 /**
  35  * @file
  36  * @brief Misc utility functions
  37  */
  38
  39
  40 bool lpcfg_is_mydomain(struct loadparm_context *lp_ctx,
  41                              const char *domain)
  42 {
  43         return strequal(lpcfg_workgroup(lp_ctx), domain);
  44 }
  45
  46 bool lpcfg_is_my_domain_or_realm(struct loadparm_context *lp_ctx,
  47                              const char *domain)
  48 {
  49         return strequal(lpcfg_workgroup(lp_ctx), domain) ||
  50                 strequal(lpcfg_realm(lp_ctx), domain);
  51 }
  52
  53 /**
  54   see if a string matches either our primary or one of our secondary
  55   netbios aliases. do a case insensitive match
  56 */
  57 bool lpcfg_is_myname(struct loadparm_context *lp_ctx, const char *name)
  58 {
  59         const char **aliases;
  60         int i;
  61
  62         if (strcasecmp_m(name, lpcfg_netbios_name(lp_ctx)) == 0) {
  63                 return true;
  64         }
  65
  66         aliases = lpcfg_netbios_aliases(lp_ctx);
  67         for (i=0; aliases && aliases[i]; i++) {
  68                 if (strcasecmp_m(name, aliases[i]) == 0) {
  69                         return true;
  70                 }
  71         }
  72
  73         return false;
  74 }
  75
  76 static char *lpcfg_common_path(TALLOC_CTX* mem_ctx,
  77                                const char *parent,
  78                                const char *name)
  79 {
  80         char *fname, *dname;
  81         bool ok;
  82
  83         if (name == NULL) {
  84                 return NULL;
  85         }
  86         if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
  87                 return talloc_strdup(mem_ctx, name);
  88         }
  89
  90         dname = talloc_strdup(mem_ctx, parent);
  91         if (dname == NULL) {
  92                 return NULL;
  93         }
  94         trim_string(dname,"","/");
  95
  96         ok = directory_create_or_exist(dname, 0755);
  97         if (!ok) {
  98                 DEBUG(1, ("Unable to create directory %s for file %s. "
  99                           "Error was %s\n", dname, name, strerror(errno)));
 100                 return NULL;
 101         }
 102
 103         fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
 104         if (fname == NULL) {
 105                 return dname;
 106         }
 107         talloc_free(dname);
 108
 109         return fname;
 110 }
 111
 112
 113 /**
 114  A useful function for returning a path in the Samba lock directory.
 115 **/
 116 char *lpcfg_lock_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
 117                          const char *name)
 118 {
 119         return lpcfg_common_path(mem_ctx, lpcfg_lock_directory(lp_ctx), name);
 120 }
 121
 122 /**
 123  A useful function for returning a path in the Samba state directory.
 124 **/
 125 char *lpcfg_state_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
 126                        const char *name)
 127 {
 128         return lpcfg_common_path(mem_ctx, lpcfg_state_directory(lp_ctx), name);
 129 }
 130
 131 /**
 132  A useful function for returning a path in the Samba cache directory.
 133 **/
 134 char *lpcfg_cache_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
 135                        const char *name)
 136 {
 137         return lpcfg_common_path(mem_ctx, lpcfg_cache_directory(lp_ctx), name);
 138 }
 139
 140 /**
 141  * @brief Returns an absolute path to a file in the directory containing the current config file
 142  *
 143  * @param name File to find, relative to the config file directory.
 144  *
 145  * @retval Pointer to a talloc'ed string containing the full path.
 146  **/
 147
 148 char *lpcfg_config_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
 149                            const char *name)
 150 {
 151         char *fname, *config_dir, *p;
 152         config_dir = talloc_strdup(mem_ctx, lpcfg_configfile(lp_ctx));
 153         if (config_dir == NULL) {
 154                 config_dir = talloc_strdup(mem_ctx, lp_default_path());
 155         }
 156         p = strrchr(config_dir, '/');
 157         if (p == NULL) {
 158                 talloc_free(config_dir);
 159                 config_dir = talloc_strdup(mem_ctx, ".");
 160                 if (config_dir == NULL) {
 161                         return NULL;
 162                 }
 163         } else {
 164                 p[0] = '\0';
 165         }
 166         fname = talloc_asprintf(mem_ctx, "%s/%s", config_dir, name);
 167         talloc_free(config_dir);
 168         return fname;
 169 }
 170
 171 /**
 172  * @brief Returns an absolute path to a file in the Samba private directory.
 173  *
 174  * @param name File to find, relative to PRIVATEDIR.
 175  * if name is not relative, then use it as-is
 176  *
 177  * @retval Pointer to a talloc'ed string containing the full path.
 178  **/
 179 char *lpcfg_private_path(TALLOC_CTX* mem_ctx,
 180                             struct loadparm_context *lp_ctx,
 181                             const char *name)
 182 {
 183         char *fname;
 184         if (name == NULL) {
 185                 return NULL;
 186         }
 187         if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
 188                 return talloc_strdup(mem_ctx, name);
 189         }
 190         fname = talloc_asprintf(mem_ctx, "%s/%s", lpcfg_private_dir(lp_ctx), name);
 191         return fname;
 192 }
 193
 194 /**
 195  * @brief Returns an absolute path to a NTDB or TDB file in the Samba
 196  * private directory.
 197  *
 198  * @param name File to find, relative to PRIVATEDIR, without .tdb extension.
 199  *
 200  * @retval Pointer to a talloc'ed string containing the full path, for
 201  * use with dbwrap_local_open().
 202  **/
 203 char *lpcfg_private_db_path(TALLOC_CTX *mem_ctx,
 204                             struct loadparm_context *lp_ctx,
 205                             const char *name)
 206 {
 207         return talloc_asprintf(mem_ctx, "%s/%s.tdb",
 208                                lpcfg_private_dir(lp_ctx), name);
 209 }
 210
 211 /**
 212   return a path in the smbd.tmp directory, where all temporary file
 213   for smbd go. If NULL is passed for name then return the directory
 214   path itself
 215 */
 216 char *smbd_tmp_path(TALLOC_CTX *mem_ctx,
 217                              struct loadparm_context *lp_ctx,
 218                              const char *name)
 219 {
 220         char *fname, *dname;
 221         bool ok;
 222
 223         dname = lpcfg_private_path(mem_ctx, lp_ctx, "smbd.tmp");
 224         if (dname == NULL) {
 225                 return NULL;
 226         }
 227
 228         ok = directory_create_or_exist(dname, 0755);
 229         if (!ok) {
 230                 return NULL;
 231         }
 232
 233         if (name == NULL) {
 234                 return dname;
 235         }
 236
 237         fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
 238         if (fname == NULL) {
 239                 return dname;
 240         }
 241         talloc_free(dname);
 242
 243         return fname;
 244 }
 245
 246 const char *lpcfg_imessaging_path(TALLOC_CTX *mem_ctx,
 247                                        struct loadparm_context *lp_ctx)
 248 {
 249         return smbd_tmp_path(mem_ctx, lp_ctx, "msg");
 250 }
 251
 252 const char *lpcfg_sam_name(struct loadparm_context *lp_ctx)
 253 {
 254         switch (lpcfg_server_role(lp_ctx)) {
 255         case ROLE_DOMAIN_BDC:
 256         case ROLE_DOMAIN_PDC:
 257         case ROLE_ACTIVE_DIRECTORY_DC:
 258         case ROLE_IPA_DC:
 259                 return lpcfg_workgroup(lp_ctx);
 260         default:
 261                 return lpcfg_netbios_name(lp_ctx);
 262         }
 263 }
 264
 265 const char *lpcfg_sam_dnsname(struct loadparm_context *lp_ctx)
 266 {
 267         switch (lpcfg_server_role(lp_ctx)) {
 268         case ROLE_ACTIVE_DIRECTORY_DC:
 269         case ROLE_IPA_DC:
 270                 return lpcfg_dnsdomain(lp_ctx);
 271         default:
 272                 return NULL;
 273         }
 274 }
 275
 276 static int
 277 tdb_fetch_lifetime_fn(TDB_DATA key, TDB_DATA data, void *private_data)
 278 {
 279         if (data.dsize < 256) {
 280                 long *result = private_data;
 281                 char tmp[data.dsize + 1];
 282                 memcpy(tmp, data.dptr, data.dsize);
 283                 tmp[data.dsize] = '\0';
 284                 *result = atol(tmp);
 285                 return 0;
 286         }
 287         return -1;
 288 }
 289
 290 static long tdb_fetch_lifetime(struct tdb_context *tdb,
 291                                const char *keystr)
 292 {
 293         long result = -1;
 294         int ret;
 295
 296         ret = tdb_parse_record(
 297                 tdb,
 298                 (TDB_DATA){
 299                         .dptr = discard_const_p(uint8_t, keystr),
 300                         .dsize = strlen(keystr),
 301                 },
 302                 tdb_fetch_lifetime_fn,
 303                 &result);
 304         if (ret == -1) {
 305                 return -1;
 306         }
 307         return result;
 308 }
 309
 310 void lpcfg_default_kdc_policy(TALLOC_CTX *mem_ctx,
 311                                 struct loadparm_context *lp_ctx,
 312                                 time_t *svc_tkt_lifetime,
 313                                 time_t *usr_tkt_lifetime,
 314                                 time_t *renewal_lifetime)
 315 {
 316         long val;
 317         TDB_CONTEXT *ctx = NULL;
 318         const char *kdc_tdb = NULL;
 319
 320         kdc_tdb = lpcfg_cache_path(mem_ctx, lp_ctx, "gpo.tdb");
 321         if (kdc_tdb)
 322                 ctx = tdb_open(kdc_tdb, 0, TDB_DEFAULT, O_RDWR, 0600);
 323
 324         if (!ctx || ( val = tdb_fetch_lifetime(ctx, "kdc:service_ticket_lifetime") ) == -1 )
 325                 val = lpcfg_parm_long(lp_ctx, NULL, "kdc", "service ticket lifetime", 10);
 326         *svc_tkt_lifetime = val * 60 * 60;
 327
 328         if (!ctx || ( val = tdb_fetch_lifetime(ctx, "kdc:user_ticket_lifetime") ) == -1 )
 329                 val = lpcfg_parm_long(lp_ctx, NULL, "kdc", "user ticket lifetime", 10);
 330         *usr_tkt_lifetime = val * 60 * 60;
 331
 332         if (!ctx || ( val = tdb_fetch_lifetime(ctx, "kdc:renewal_lifetime") ) == -1 )
 333                 val = lpcfg_parm_long(lp_ctx, NULL, "kdc", "renewal lifetime", 24 * 7);
 334         *renewal_lifetime = val * 60 * 60;
 335
 336         if (ctx != NULL) {
 337                 tdb_close(ctx);
 338                 ctx = NULL;
 339         }
 340 }