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/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                         /* fall through */
  56                 case 0:
  57                         if (p - pass) {
  58                                 *p = '\0'; /* null-terminate it, just in case... */
  59                                 p = NULL; /* then force the loop condition to become false */
  60                                 break;
  61                         } else {
  62                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
  63                                 return False;
  64                         }
  65
  66                 default:
  67                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
  68                                         fd, strerror(errno));
  69                         return False;
  70                 }
  71         }
  72
  73         cli_credentials_set_password(credentials, pass, obtained);
  74         return True;
  75 }
  76
  77 /**
  78  * Read a named file, and parse it for a password
  79  *
  80  * @param credentials Credentials structure on which to set the password
  81  * @param file a named file to read the password from
  82  * @param obtained This enum describes how 'specified' this password is
  83  */
  84
  85 BOOL cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
  86 {
  87         int fd = open(file, O_RDONLY, 0);
  88         BOOL ret;
  89
  90         if (fd < 0) {
  91                 fprintf(stderr, "Error opening PASSWD_FILE %s: %s\n",
  92                                 file, strerror(errno));
  93                 return False;
  94         }
  95
  96         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
  97
  98         close(fd);
  99
 100         return ret;
 101 }
 102
 103 /**
 104  * Read a named file, and parse it for username, domain, realm and password
 105  *
 106  * @param credentials Credentials structure on which to set the password
 107  * @param file a named file to read the details from
 108  * @param obtained This enum describes how 'specified' this password is
 109  */
 110
 111 BOOL cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
 112 {
 113         uint16_t len = 0;
 114         char *ptr, *val, *param;
 115         char **lines;
 116         int i, numlines;
 117
 118         lines = file_lines_load(file, &numlines, NULL);
 119
 120         if (lines == NULL)
 121         {
 122                 /* fail if we can't open the credentials file */
 123                 d_printf("ERROR: Unable to open credentials file!\n");
 124                 return False;
 125         }
 126
 127         for (i = 0; i < numlines; i++) {
 128                 len = strlen(lines[i]);
 129
 130                 if (len == 0)
 131                         continue;
 132
 133                 /* break up the line into parameter & value.
 134                  * will need to eat a little whitespace possibly */
 135                 param = lines[i];
 136                 if (!(ptr = strchr_m (lines[i], '=')))
 137                         continue;
 138
 139                 val = ptr+1;
 140                 *ptr = '\0';
 141
 142                 /* eat leading white space */
 143                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
 144                         val++;
 145
 146                 if (strwicmp("password", param) == 0) {
 147                         cli_credentials_set_password(cred, val, obtained);
 148                 } else if (strwicmp("username", param) == 0) {
 149                         cli_credentials_set_username(cred, val, obtained);
 150                 } else if (strwicmp("domain", param) == 0) {
 151                         cli_credentials_set_domain(cred, val, obtained);
 152                 } else if (strwicmp("realm", param) == 0) {
 153                         cli_credentials_set_realm(cred, val, obtained);
 154                 }
 155                 memset(lines[i], 0, len);
 156         }
 157
 158         talloc_free(lines);
 159
 160         return True;
 161 }
 162
 163
 164 /**
 165  * Fill in credentials for the machine trust account, from the secrets database.
 166  *
 167  * @param cred Credentials structure to fill in
 168  * @retval NTSTATUS error detailing any failure
 169  */
 170 NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
 171                                      const char *base,
 172                                      const char *filter)
 173 {
 174         TALLOC_CTX *mem_ctx;
 175
 176         struct ldb_context *ldb;
 177         int ldb_ret;
 178         struct ldb_message **msgs;
 179         const char *attrs[] = {
 180                 "secret",
 181                 "priorSecret",
 182                 "samAccountName",
 183                 "flatname",
 184                 "realm",
 185                 "secureChannelType",
 186                 "ntPwdHash",
 187                 "msDS-KeyVersionNumber",
 188                 "saltPrincipal",
 189                 "privateKeytab",
 190                 "krb5Keytab",
 191                 NULL
 192         };
 193
 194         const char *machine_account;
 195         const char *password;
 196         const char *old_password;
 197         const char *domain;
 198         const char *realm;
 199         enum netr_SchannelType sct;
 200         const char *salt_principal;
 201         const char *keytab;
 202
 203         /* ok, we are going to get it now, don't recurse back here */
 204         cred->machine_account_pending = False;
 205
 206         /* some other parts of the system will key off this */
 207         cred->machine_account = True;
 208
 209         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
 210
 211         /* Local secrets are stored in secrets.ldb */
 212         ldb = secrets_db_connect(mem_ctx);
 213         if (!ldb) {
 214                 /* set anonymous as the fallback, if the machine account won't work */
 215                 cli_credentials_set_anonymous(cred);
 216                 DEBUG(1, ("Could not open secrets.ldb\n"));
 217                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 218         }
 219
 220         /* search for the secret record */
 221         ldb_ret = gendb_search(ldb,
 222                                mem_ctx, ldb_dn_explode(mem_ctx, base),
 223                                &msgs, attrs,
 224                                "%s", filter);
 225         if (ldb_ret == 0) {
 226                 DEBUG(1, ("Could not find entry to match filter: %s\n",
 227                           filter));
 228                 /* set anonymous as the fallback, if the machine account won't work */
 229                 cli_credentials_set_anonymous(cred);
 230                 talloc_free(mem_ctx);
 231                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 232         } else if (ldb_ret != 1) {
 233                 DEBUG(1, ("Found more than one (%d) entry to match filter: %s\n",
 234                           ldb_ret, filter));
 235                 /* set anonymous as the fallback, if the machine account won't work */
 236                 cli_credentials_set_anonymous(cred);
 237                 talloc_free(mem_ctx);
 238                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 239         }
 240
 241         password = ldb_msg_find_string(msgs[0], "secret", NULL);
 242         old_password = ldb_msg_find_string(msgs[0], "priorSecret", NULL);
 243
 244         machine_account = ldb_msg_find_string(msgs[0], "samAccountName", NULL);
 245
 246         if (!machine_account) {
 247                 DEBUG(1, ("Could not find 'samAccountName' in join record to domain: %s\n",
 248                           cli_credentials_get_domain(cred)));
 249                 /* set anonymous as the fallback, if the machine account won't work */
 250                 cli_credentials_set_anonymous(cred);
 251                 talloc_free(mem_ctx);
 252                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 253         }
 254
 255         salt_principal = ldb_msg_find_string(msgs[0], "saltPrincipal", NULL);
 256         cli_credentials_set_salt_principal(cred, salt_principal);
 257
 258         sct = ldb_msg_find_int(msgs[0], "secureChannelType", 0);
 259         if (sct) {
 260                 cli_credentials_set_secure_channel_type(cred, sct);
 261         }
 262
 263         if (!password) {
 264                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "ntPwdHash");
 265                 struct samr_Password hash;
 266                 ZERO_STRUCT(hash);
 267                 if (nt_password_hash) {
 268                         memcpy(hash.hash, nt_password_hash->data,
 269                                MIN(nt_password_hash->length, sizeof(hash.hash)));
 270
 271                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
 272                 } else {
 273                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 274                 }
 275         } else {
 276                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
 277         }
 278
 279
 280         domain = ldb_msg_find_string(msgs[0], "flatname", NULL);
 281         if (domain) {
 282                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
 283         }
 284
 285         realm = ldb_msg_find_string(msgs[0], "realm", NULL);
 286         if (realm) {
 287                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 288         }
 289
 290         cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
 291
 292         cli_credentials_set_kvno(cred, ldb_msg_find_int(msgs[0], "msDS-KeyVersionNumber", 0));
 293
 294         /* If there was an external keytab specified by reference in
 295          * the LDB, then use this.  Otherwise we will make one up
 296          * (chewing CPU time) from the password */
 297         keytab = ldb_msg_find_string(msgs[0], "krb5Keytab", NULL);
 298         if (keytab) {
 299                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 300         } else {
 301                 keytab = ldb_msg_find_string(msgs[0], "privateKeytab", NULL);
 302                 if (keytab) {
 303                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, keytab));
 304                         if (keytab) {
 305                                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 306                         }
 307                 }
 308         }
 309         talloc_free(mem_ctx);
 310
 311         return NT_STATUS_OK;
 312 }
 313
 314 /**
 315  * Fill in credentials for the machine trust account, from the secrets database.
 316  *
 317  * @param cred Credentials structure to fill in
 318  * @retval NTSTATUS error detailing any failure
 319  */
 320 NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred)
 321 {
 322         char *filter;
 323         /* Bleh, nasty recursion issues: We are setting a machine
 324          * account here, so we don't want the 'pending' flag around
 325          * any more */
 326         cred->machine_account_pending = False;
 327         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
 328                                        cli_credentials_get_domain(cred));
 329         return cli_credentials_set_secrets(cred, SECRETS_PRIMARY_DOMAIN_DN,
 330                                            filter);
 331 }
 332
 333 /**
 334  * Fill in credentials for the machine trust account, from the secrets database.
 335  *
 336  * @param cred Credentials structure to fill in
 337  * @retval NTSTATUS error detailing any failure
 338  */
 339 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred)
 340 {
 341         char *filter;
 342         /* Bleh, nasty recursion issues: We are setting a machine
 343          * account here, so we don't want the 'pending' flag around
 344          * any more */
 345         cred->machine_account_pending = False;
 346         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
 347                                        cli_credentials_get_realm(cred),
 348                                        cli_credentials_get_domain(cred));
 349         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 350                                            filter);
 351 }
 352
 353 /**
 354  * Fill in credentials for the machine trust account, from the secrets database.
 355  *
 356  * @param cred Credentials structure to fill in
 357  * @retval NTSTATUS error detailing any failure
 358  */
 359 NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
 360                                               const char *serviceprincipal)
 361 {
 362         char *filter;
 363         /* Bleh, nasty recursion issues: We are setting a machine
 364          * account here, so we don't want the 'pending' flag around
 365          * any more */
 366         cred->machine_account_pending = False;
 367         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
 368                                  cli_credentials_get_realm(cred),
 369                                  cli_credentials_get_domain(cred),
 370                                  serviceprincipal);
 371         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 372                                            filter);
 373 }
 374
 375 /**
 376  * Ask that when required, the credentials system will be filled with
 377  * machine trust account, from the secrets database.
 378  *
 379  * @param cred Credentials structure to fill in
 380  * @note This function is used to call the above function after, rather
 381  *       than during, popt processing.
 382  *
 383  */
 384 void cli_credentials_set_machine_account_pending(struct cli_credentials *cred)
 385 {
 386         cred->machine_account_pending = True;
 387 }
 388
 389
 390 NTSTATUS cli_credentials_update_all_keytabs(TALLOC_CTX *parent_ctx)
 391 {
 392         TALLOC_CTX *mem_ctx;
 393         int ldb_ret;
 394         struct ldb_context *ldb;
 395         struct ldb_message **msgs;
 396         const char *attrs[] = { NULL };
 397         struct cli_credentials *creds;
 398         const char *filter;
 399         NTSTATUS status;
 400         int i, ret;
 401
 402         mem_ctx = talloc_new(parent_ctx);
 403         if (!mem_ctx) {
 404                 return NT_STATUS_NO_MEMORY;
 405         }
 406
 407         /* Local secrets are stored in secrets.ldb */
 408         ldb = secrets_db_connect(mem_ctx);
 409         if (!ldb) {
 410                 DEBUG(1, ("Could not open secrets.ldb\n"));
 411                 talloc_free(mem_ctx);
 412                 return NT_STATUS_ACCESS_DENIED;
 413         }
 414
 415         /* search for the secret record, but only of things we can
 416          * actually update */
 417         ldb_ret = gendb_search(ldb,
 418                                mem_ctx, NULL,
 419                                &msgs, attrs,
 420                                "(&(objectClass=kerberosSecret)(|(secret=*)(ntPwdHash=*)))");
 421         if (ldb_ret == -1) {
 422                 DEBUG(1, ("Error looking for kerberos type secrets to push into a keytab:: %s", ldb_errstring(ldb)));
 423                 talloc_free(mem_ctx);
 424                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 425         }
 426
 427         for (i=0; i < ldb_ret; i++) {
 428                 /* Make a credentials structure from it */
 429                 creds = cli_credentials_init(mem_ctx);
 430                 if (!creds) {
 431                         DEBUG(1, ("cli_credentials_init failed!"));
 432                         talloc_free(mem_ctx);
 433                         return NT_STATUS_NO_MEMORY;
 434                 }
 435                 cli_credentials_set_conf(creds);
 436                 filter = talloc_asprintf(mem_ctx, "dn=%s", ldb_dn_linearize(mem_ctx, msgs[i]->dn));
 437                 status = cli_credentials_set_secrets(creds, NULL, filter);
 438                 if (!NT_STATUS_IS_OK(status)) {
 439                         DEBUG(1, ("Failed to read secrets for keytab update for %s\n",
 440                                   filter));
 441                         continue;
 442                 }
 443                 ret = cli_credentials_update_keytab(creds);
 444                 if (ret != 0) {
 445                         DEBUG(1, ("Failed to update keytab for %s\n",
 446                                   filter));
 447                         continue;
 448                 }
 449         }
 450         return NT_STATUS_OK;
 451 }
 452