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