source4/auth/credentials/credentials_files.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    User credentials handling (as regards on-disk files)
   5
   6    Copyright (C) Jelmer Vernooij 2005
   7    Copyright (C) Tim Potter 2001
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "librpc/gen_ndr/ndr_samr.h" /* for struct samrPassword */
  28 #include "passdb/secrets.h"
  29 #include "system/filesys.h"
  30 #include "db_wrap.h"
  31 #include "auth/credentials/credentials.h"
  32
  33 /**
  34  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
  35  *
  36  * @param credentials Credentials structure on which to set the password
  37  * @param fd open file descriptor to read the password from
  38  * @param obtained This enum describes how 'specified' this password is
  39  */
  40
  41 BOOL cli_credentials_parse_password_fd(struct cli_credentials *credentials,
  42                                        int fd, enum credentials_obtained obtained)
  43 {
  44         char *p;
  45         char pass[128];
  46
  47         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
  48                 p && p - pass < sizeof(pass);) {
  49                 switch (read(fd, p, 1)) {
  50                 case 1:
  51                         if (*p != '\n' && *p != '\0') {
  52                                 *++p = '\0'; /* advance p, and null-terminate pass */
  53                                 break;
  54                         }
  55                 case 0:
  56                         if (p - pass) {
  57                                 *p = '\0'; /* null-terminate it, just in case... */
  58                                 p = NULL; /* then force the loop condition to become false */
  59                                 break;
  60                         } else {
  61                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
  62                                 return False;
  63                         }
  64
  65                 default:
  66                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
  67                                         fd, strerror(errno));
  68                         return False;
  69                 }
  70         }
  71
  72         cli_credentials_set_password(credentials, pass, obtained);
  73         return True;
  74 }
  75
  76 /**
  77  * Read a named file, and parse it for a password
  78  *
  79  * @param credentials Credentials structure on which to set the password
  80  * @param file a named file to read the password from
  81  * @param obtained This enum describes how 'specified' this password is
  82  */
  83
  84 BOOL cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
  85 {
  86         int fd = open(file, O_RDONLY, 0);
  87         BOOL ret;
  88
  89         if (fd < 0) {
  90                 fprintf(stderr, "Error opening PASSWD_FILE %s: %s\n",
  91                                 file, strerror(errno));
  92                 return False;
  93         }
  94
  95         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
  96
  97         close(fd);
  98
  99         return ret;
 100 }
 101
 102 /**
 103  * Read a named file, and parse it for username, domain, realm and password
 104  *
 105  * @param credentials Credentials structure on which to set the password
 106  * @param file a named file to read the details from
 107  * @param obtained This enum describes how 'specified' this password is
 108  */
 109
 110 BOOL cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
 111 {
 112         uint16_t len = 0;
 113         char *ptr, *val, *param;
 114         char **lines;
 115         int i, numlines;
 116
 117         lines = file_lines_load(file, &numlines, NULL);
 118
 119         if (lines == NULL)
 120         {
 121                 /* fail if we can't open the credentials file */
 122                 d_printf("ERROR: Unable to open credentials file!\n");
 123                 return False;
 124         }
 125
 126         for (i = 0; i < numlines; i++) {
 127                 len = strlen(lines[i]);
 128
 129                 if (len == 0)
 130                         continue;
 131
 132                 /* break up the line into parameter & value.
 133                  * will need to eat a little whitespace possibly */
 134                 param = lines[i];
 135                 if (!(ptr = strchr_m (lines[i], '=')))
 136                         continue;
 137
 138                 val = ptr+1;
 139                 *ptr = '\0';
 140
 141                 /* eat leading white space */
 142                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
 143                         val++;
 144
 145                 if (strwicmp("password", param) == 0) {
 146                         cli_credentials_set_password(cred, val, obtained);
 147                 } else if (strwicmp("username", param) == 0) {
 148                         cli_credentials_set_username(cred, val, obtained);
 149                 } else if (strwicmp("domain", param) == 0) {
 150                         cli_credentials_set_domain(cred, val, obtained);
 151                 } else if (strwicmp("realm", param) == 0) {
 152                         cli_credentials_set_realm(cred, val, obtained);
 153                 }
 154                 memset(lines[i], 0, len);
 155         }
 156
 157         talloc_free(lines);
 158
 159         return True;
 160 }
 161
 162
 163 /**
 164  * Fill in credentials for the machine trust account, from the secrets database.
 165  *
 166  * @param cred Credentials structure to fill in
 167  * @retval NTSTATUS error detailing any failure
 168  */
 169 NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
 170                                      const char *base,
 171                                      const char *filter)
 172 {
 173         TALLOC_CTX *mem_ctx;
 174
 175         struct ldb_context *ldb;
 176         int ldb_ret;
 177         struct ldb_message **msgs;
 178         const char *attrs[] = {
 179                 "secret",
 180                 "priorSecret",
 181                 "samAccountName",
 182                 "flatname",
 183                 "realm",
 184                 "secureChannelType",
 185                 "ntPwdHash",
 186                 "msDS-KeyVersionNumber",
 187                 "saltPrincipal",
 188                 "privateKeytab",
 189                 "krb5Keytab",
 190                 NULL
 191         };
 192
 193         const char *machine_account;
 194         const char *password;
 195         const char *old_password;
 196         const char *domain;
 197         const char *realm;
 198         enum netr_SchannelType sct;
 199         const char *salt_principal;
 200         const char *keytab;
 201
 202         /* ok, we are going to get it now, don't recurse back here */
 203         cred->machine_account_pending = False;
 204
 205         /* some other parts of the system will key off this */
 206         cred->machine_account = True;
 207
 208         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
 209
 210         /* Local secrets are stored in secrets.ldb */
 211         ldb = secrets_db_connect(mem_ctx);
 212         if (!ldb) {
 213                 /* set anonymous as the fallback, if the machine account won't work */
 214                 cli_credentials_set_anonymous(cred);
 215                 DEBUG(1, ("Could not open secrets.ldb\n"));
 216                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 217         }
 218
 219         /* search for the secret record */
 220         ldb_ret = gendb_search(ldb,
 221                                mem_ctx, ldb_dn_explode(mem_ctx, base),
 222                                &msgs, attrs,
 223                                "%s", filter);
 224         if (ldb_ret == 0) {
 225                 DEBUG(1, ("Could not find entry to match filter: %s\n",
 226                           filter));
 227                 /* set anonymous as the fallback, if the machine account won't work */
 228                 cli_credentials_set_anonymous(cred);
 229                 talloc_free(mem_ctx);
 230                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 231         } else if (ldb_ret != 1) {
 232                 DEBUG(1, ("Found more than one (%d) entry to match filter: %s\n",
 233                           ldb_ret, filter));
 234                 /* set anonymous as the fallback, if the machine account won't work */
 235                 cli_credentials_set_anonymous(cred);
 236                 talloc_free(mem_ctx);
 237                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 238         }
 239
 240         password = ldb_msg_find_string(msgs[0], "secret", NULL);
 241         old_password = ldb_msg_find_string(msgs[0], "priorSecret", NULL);
 242
 243         machine_account = ldb_msg_find_string(msgs[0], "samAccountName", NULL);
 244
 245         if (!machine_account) {
 246                 DEBUG(1, ("Could not find 'samAccountName' in join record to domain: %s\n",
 247                           cli_credentials_get_domain(cred)));
 248                 /* set anonymous as the fallback, if the machine account won't work */
 249                 cli_credentials_set_anonymous(cred);
 250                 talloc_free(mem_ctx);
 251                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 252         }
 253
 254         salt_principal = ldb_msg_find_string(msgs[0], "saltPrincipal", NULL);
 255         cli_credentials_set_salt_principal(cred, salt_principal);
 256
 257         sct = ldb_msg_find_int(msgs[0], "secureChannelType", 0);
 258         if (sct) {
 259                 cli_credentials_set_secure_channel_type(cred, sct);
 260         }
 261
 262         if (!password) {
 263                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "ntPwdHash");
 264                 struct samr_Password hash;
 265                 ZERO_STRUCT(hash);
 266                 if (nt_password_hash) {
 267                         memcpy(hash.hash, nt_password_hash->data,
 268                                MIN(nt_password_hash->length, sizeof(hash.hash)));
 269
 270                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
 271                 } else {
 272                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 273                 }
 274         } else {
 275                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
 276         }
 277
 278
 279         domain = ldb_msg_find_string(msgs[0], "flatname", NULL);
 280         if (domain) {
 281                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
 282         }
 283
 284         realm = ldb_msg_find_string(msgs[0], "realm", NULL);
 285         if (realm) {
 286                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 287         }
 288
 289         cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
 290
 291         cli_credentials_set_kvno(cred, ldb_msg_find_int(msgs[0], "msDS-KeyVersionNumber", 0));
 292
 293         /* If there was an external keytab specified by reference in
 294          * the LDB, then use this.  Otherwise we will make one up
 295          * (chewing CPU time) from the password */
 296         keytab = ldb_msg_find_string(msgs[0], "krb5Keytab", NULL);
 297         if (keytab) {
 298                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 299         } else {
 300                 keytab = ldb_msg_find_string(msgs[0], "privateKeytab", NULL);
 301                 if (keytab) {
 302                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, keytab));
 303                         if (keytab) {
 304                                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 305                         }
 306                 }
 307         }
 308         talloc_free(mem_ctx);
 309
 310         return NT_STATUS_OK;
 311 }
 312
 313 /**
 314  * Fill in credentials for the machine trust account, from the secrets database.
 315  *
 316  * @param cred Credentials structure to fill in
 317  * @retval NTSTATUS error detailing any failure
 318  */
 319 NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred)
 320 {
 321         char *filter;
 322         /* Bleh, nasty recursion issues: We are setting a machine
 323          * account here, so we don't want the 'pending' flag around
 324          * any more */
 325         cred->machine_account_pending = False;
 326         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
 327                                        cli_credentials_get_domain(cred));
 328         return cli_credentials_set_secrets(cred, SECRETS_PRIMARY_DOMAIN_DN,
 329                                            filter);
 330 }
 331
 332 /**
 333  * Fill in credentials for the machine trust account, from the secrets database.
 334  *
 335  * @param cred Credentials structure to fill in
 336  * @retval NTSTATUS error detailing any failure
 337  */
 338 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred)
 339 {
 340         char *filter;
 341         /* Bleh, nasty recursion issues: We are setting a machine
 342          * account here, so we don't want the 'pending' flag around
 343          * any more */
 344         cred->machine_account_pending = False;
 345         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
 346                                        cli_credentials_get_realm(cred),
 347                                        cli_credentials_get_domain(cred));
 348         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 349                                            filter);
 350 }
 351
 352 /**
 353  * Fill in credentials for the machine trust account, from the secrets database.
 354  *
 355  * @param cred Credentials structure to fill in
 356  * @retval NTSTATUS error detailing any failure
 357  */
 358 NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
 359                                               const char *serviceprincipal)
 360 {
 361         char *filter;
 362         /* Bleh, nasty recursion issues: We are setting a machine
 363          * account here, so we don't want the 'pending' flag around
 364          * any more */
 365         cred->machine_account_pending = False;
 366         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
 367                                  cli_credentials_get_realm(cred),
 368                                  cli_credentials_get_domain(cred),
 369                                  serviceprincipal);
 370         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 371                                            filter);
 372 }
 373
 374 /**
 375  * Ask that when required, the credentials system will be filled with
 376  * machine trust account, from the secrets database.
 377  *
 378  * @param cred Credentials structure to fill in
 379  * @note This function is used to call the above function after, rather
 380  *       than during, popt processing.
 381  *
 382  */
 383 void cli_credentials_set_machine_account_pending(struct cli_credentials *cred)
 384 {
 385         cred->machine_account_pending = True;
 386 }
 387
 388
 389 NTSTATUS cli_credentials_update_all_keytabs(TALLOC_CTX *parent_ctx)
 390 {
 391         TALLOC_CTX *mem_ctx;
 392         int ldb_ret;
 393         struct ldb_context *ldb;
 394         struct ldb_message **msgs;
 395         const char *attrs[] = { NULL };
 396         struct cli_credentials *creds;
 397         const char *filter;
 398         NTSTATUS status;
 399         int i, ret;
 400
 401         mem_ctx = talloc_new(parent_ctx);
 402         if (!mem_ctx) {
 403                 return NT_STATUS_NO_MEMORY;
 404         }
 405
 406         /* Local secrets are stored in secrets.ldb */
 407         ldb = secrets_db_connect(mem_ctx);
 408         if (!ldb) {
 409                 DEBUG(1, ("Could not open secrets.ldb\n"));
 410                 talloc_free(mem_ctx);
 411                 return NT_STATUS_ACCESS_DENIED;
 412         }
 413
 414         /* search for the secret record, but only of things we can
 415          * actually update */
 416         ldb_ret = gendb_search(ldb,
 417                                mem_ctx, NULL,
 418                                &msgs, attrs,
 419                                "(&(objectClass=kerberosSecret)(|(secret=*)(ntPwdHash=*)))");
 420         if (ldb_ret == -1) {
 421                 DEBUG(1, ("Error looking for kerberos type secrets to push into a keytab:: %s", ldb_errstring(ldb)));
 422                 talloc_free(mem_ctx);
 423                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 424         }
 425
 426         for (i=0; i < ldb_ret; i++) {
 427                 /* Make a credentials structure from it */
 428                 creds = cli_credentials_init(mem_ctx);
 429                 if (!creds) {
 430                         DEBUG(1, ("cli_credentials_init failed!"));
 431                         talloc_free(mem_ctx);
 432                         return NT_STATUS_NO_MEMORY;
 433                 }
 434                 cli_credentials_set_conf(creds);
 435                 filter = talloc_asprintf(mem_ctx, "dn=%s", ldb_dn_linearize(mem_ctx, msgs[i]->dn));
 436                 status = cli_credentials_set_secrets(creds, NULL, filter);
 437                 if (!NT_STATUS_IS_OK(status)) {
 438                         DEBUG(1, ("Failed to read secrets for keytab update for %s\n",
 439                                   filter));
 440                         continue;
 441                 }
 442                 ret = cli_credentials_update_keytab(creds);
 443                 if (ret != 0) {
 444                         DEBUG(1, ("Failed to update keytab for %s\n",
 445                                   filter));
 446                         continue;
 447                 }
 448         }
 449         return NT_STATUS_OK;
 450 }
 451