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 "param/secrets.h"
  29 #include "system/filesys.h"
  30 #include "db_wrap.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "auth/credentials/credentials_krb5.h"
  33
  34 /**
  35  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
  36  *
  37  * @param credentials Credentials structure on which to set the password
  38  * @param fd open file descriptor to read the password from
  39  * @param obtained This enum describes how 'specified' this password is
  40  */
  41
  42 BOOL cli_credentials_parse_password_fd(struct cli_credentials *credentials,
  43                                        int fd, enum credentials_obtained obtained)
  44 {
  45         char *p;
  46         char pass[128];
  47
  48         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
  49                 p && p - pass < sizeof(pass);) {
  50                 switch (read(fd, p, 1)) {
  51                 case 1:
  52                         if (*p != '\n' && *p != '\0') {
  53                                 *++p = '\0'; /* advance p, and null-terminate pass */
  54                                 break;
  55                         }
  56                         /* fall through */
  57                 case 0:
  58                         if (p - pass) {
  59                                 *p = '\0'; /* null-terminate it, just in case... */
  60                                 p = NULL; /* then force the loop condition to become false */
  61                                 break;
  62                         } else {
  63                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
  64                                 return False;
  65                         }
  66
  67                 default:
  68                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
  69                                         fd, strerror(errno));
  70                         return False;
  71                 }
  72         }
  73
  74         cli_credentials_set_password(credentials, pass, obtained);
  75         return True;
  76 }
  77
  78 /**
  79  * Read a named file, and parse it for a password
  80  *
  81  * @param credentials Credentials structure on which to set the password
  82  * @param file a named file to read the password from
  83  * @param obtained This enum describes how 'specified' this password is
  84  */
  85
  86 BOOL cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
  87 {
  88         int fd = open(file, O_RDONLY, 0);
  89         BOOL ret;
  90
  91         if (fd < 0) {
  92                 fprintf(stderr, "Error opening PASSWD_FILE %s: %s\n",
  93                                 file, strerror(errno));
  94                 return False;
  95         }
  96
  97         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
  98
  99         close(fd);
 100
 101         return ret;
 102 }
 103
 104 /**
 105  * Read a named file, and parse it for username, domain, realm and password
 106  *
 107  * @param credentials Credentials structure on which to set the password
 108  * @param file a named file to read the details from
 109  * @param obtained This enum describes how 'specified' this password is
 110  */
 111
 112 BOOL cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
 113 {
 114         uint16_t len = 0;
 115         char *ptr, *val, *param;
 116         char **lines;
 117         int i, numlines;
 118
 119         lines = file_lines_load(file, &numlines, NULL);
 120
 121         if (lines == NULL)
 122         {
 123                 /* fail if we can't open the credentials file */
 124                 d_printf("ERROR: Unable to open credentials file!\n");
 125                 return False;
 126         }
 127
 128         for (i = 0; i < numlines; i++) {
 129                 len = strlen(lines[i]);
 130
 131                 if (len == 0)
 132                         continue;
 133
 134                 /* break up the line into parameter & value.
 135                  * will need to eat a little whitespace possibly */
 136                 param = lines[i];
 137                 if (!(ptr = strchr_m (lines[i], '=')))
 138                         continue;
 139
 140                 val = ptr+1;
 141                 *ptr = '\0';
 142
 143                 /* eat leading white space */
 144                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
 145                         val++;
 146
 147                 if (strwicmp("password", param) == 0) {
 148                         cli_credentials_set_password(cred, val, obtained);
 149                 } else if (strwicmp("username", param) == 0) {
 150                         cli_credentials_set_username(cred, val, obtained);
 151                 } else if (strwicmp("domain", param) == 0) {
 152                         cli_credentials_set_domain(cred, val, obtained);
 153                 } else if (strwicmp("realm", param) == 0) {
 154                         cli_credentials_set_realm(cred, val, obtained);
 155                 }
 156                 memset(lines[i], 0, len);
 157         }
 158
 159         talloc_free(lines);
 160
 161         return True;
 162 }
 163
 164
 165 /**
 166  * Fill in credentials for the machine trust account, from the secrets database.
 167  *
 168  * @param cred Credentials structure to fill in
 169  * @retval NTSTATUS error detailing any failure
 170  */
 171 NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
 172                                      const char *base,
 173                                      const char *filter)
 174 {
 175         TALLOC_CTX *mem_ctx;
 176
 177         struct ldb_context *ldb;
 178         int ldb_ret;
 179         struct ldb_message **msgs;
 180         const char *attrs[] = {
 181                 "secret",
 182                 "priorSecret",
 183                 "samAccountName",
 184                 "flatname",
 185                 "realm",
 186                 "secureChannelType",
 187                 "ntPwdHash",
 188                 "msDS-KeyVersionNumber",
 189                 "saltPrincipal",
 190                 "privateKeytab",
 191                 "krb5Keytab",
 192                 NULL
 193         };
 194
 195         const char *machine_account;
 196         const char *password;
 197         const char *old_password;
 198         const char *domain;
 199         const char *realm;
 200         enum netr_SchannelType sct;
 201         const char *salt_principal;
 202         const char *keytab;
 203
 204         /* ok, we are going to get it now, don't recurse back here */
 205         cred->machine_account_pending = False;
 206
 207         /* some other parts of the system will key off this */
 208         cred->machine_account = True;
 209
 210         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
 211
 212         /* Local secrets are stored in secrets.ldb */
 213         ldb = secrets_db_connect(mem_ctx);
 214         if (!ldb) {
 215                 /* set anonymous as the fallback, if the machine account won't work */
 216                 cli_credentials_set_anonymous(cred);
 217                 DEBUG(1, ("Could not open secrets.ldb\n"));
 218                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 219         }
 220
 221         /* search for the secret record */
 222         ldb_ret = gendb_search(ldb,
 223                                mem_ctx, ldb_dn_new(mem_ctx, ldb, base),
 224                                &msgs, attrs,
 225                                "%s", filter);
 226         if (ldb_ret == 0) {
 227                 DEBUG(1, ("Could not find entry to match filter: %s\n",
 228                           filter));
 229                 /* set anonymous as the fallback, if the machine account won't work */
 230                 cli_credentials_set_anonymous(cred);
 231                 talloc_free(mem_ctx);
 232                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 233         } else if (ldb_ret != 1) {
 234                 DEBUG(1, ("Found more than one (%d) entry to match filter: %s\n",
 235                           ldb_ret, filter));
 236                 /* set anonymous as the fallback, if the machine account won't work */
 237                 cli_credentials_set_anonymous(cred);
 238                 talloc_free(mem_ctx);
 239                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 240         }
 241
 242         password = ldb_msg_find_attr_as_string(msgs[0], "secret", NULL);
 243         old_password = ldb_msg_find_attr_as_string(msgs[0], "priorSecret", NULL);
 244
 245         machine_account = ldb_msg_find_attr_as_string(msgs[0], "samAccountName", NULL);
 246
 247         if (!machine_account) {
 248                 DEBUG(1, ("Could not find 'samAccountName' in join record to domain: %s\n",
 249                           cli_credentials_get_domain(cred)));
 250                 /* set anonymous as the fallback, if the machine account won't work */
 251                 cli_credentials_set_anonymous(cred);
 252                 talloc_free(mem_ctx);
 253                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 254         }
 255
 256         salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL);
 257         cli_credentials_set_salt_principal(cred, salt_principal);
 258
 259         sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0);
 260         if (sct) {
 261                 cli_credentials_set_secure_channel_type(cred, sct);
 262         }
 263
 264         if (!password) {
 265                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "ntPwdHash");
 266                 struct samr_Password hash;
 267                 ZERO_STRUCT(hash);
 268                 if (nt_password_hash) {
 269                         memcpy(hash.hash, nt_password_hash->data,
 270                                MIN(nt_password_hash->length, sizeof(hash.hash)));
 271
 272                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
 273                 } else {
 274                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 275                 }
 276         } else {
 277                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
 278         }
 279
 280
 281         domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL);
 282         if (domain) {
 283                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
 284         }
 285
 286         realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL);
 287         if (realm) {
 288                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 289         }
 290
 291         cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
 292
 293         cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0));
 294
 295         /* If there was an external keytab specified by reference in
 296          * the LDB, then use this.  Otherwise we will make one up
 297          * (chewing CPU time) from the password */
 298         keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL);
 299         if (keytab) {
 300                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 301         } else {
 302                 keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL);
 303                 if (keytab) {
 304                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, keytab));
 305                         if (keytab) {
 306                                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
 307                         }
 308                 }
 309         }
 310         talloc_free(mem_ctx);
 311
 312         return NT_STATUS_OK;
 313 }
 314
 315 /**
 316  * Fill in credentials for the machine trust account, from the secrets database.
 317  *
 318  * @param cred Credentials structure to fill in
 319  * @retval NTSTATUS error detailing any failure
 320  */
 321 NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred)
 322 {
 323         char *filter;
 324         /* Bleh, nasty recursion issues: We are setting a machine
 325          * account here, so we don't want the 'pending' flag around
 326          * any more */
 327         cred->machine_account_pending = False;
 328         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
 329                                        cli_credentials_get_domain(cred));
 330         return cli_credentials_set_secrets(cred, SECRETS_PRIMARY_DOMAIN_DN,
 331                                            filter);
 332 }
 333
 334 /**
 335  * Fill in credentials for the machine trust account, from the secrets database.
 336  *
 337  * @param cred Credentials structure to fill in
 338  * @retval NTSTATUS error detailing any failure
 339  */
 340 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred)
 341 {
 342         char *filter;
 343         /* Bleh, nasty recursion issues: We are setting a machine
 344          * account here, so we don't want the 'pending' flag around
 345          * any more */
 346         cred->machine_account_pending = False;
 347         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
 348                                        cli_credentials_get_realm(cred),
 349                                        cli_credentials_get_domain(cred));
 350         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 351                                            filter);
 352 }
 353
 354 /**
 355  * Fill in credentials for the machine trust account, from the secrets database.
 356  *
 357  * @param cred Credentials structure to fill in
 358  * @retval NTSTATUS error detailing any failure
 359  */
 360 NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
 361                                               const char *serviceprincipal)
 362 {
 363         char *filter;
 364         /* Bleh, nasty recursion issues: We are setting a machine
 365          * account here, so we don't want the 'pending' flag around
 366          * any more */
 367         cred->machine_account_pending = False;
 368         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
 369                                  cli_credentials_get_realm(cred),
 370                                  cli_credentials_get_domain(cred),
 371                                  serviceprincipal);
 372         return cli_credentials_set_secrets(cred, SECRETS_PRINCIPALS_DN,
 373                                            filter);
 374 }
 375
 376 /**
 377  * Ask that when required, the credentials system will be filled with
 378  * machine trust account, from the secrets database.
 379  *
 380  * @param cred Credentials structure to fill in
 381  * @note This function is used to call the above function after, rather
 382  *       than during, popt processing.
 383  *
 384  */
 385 void cli_credentials_set_machine_account_pending(struct cli_credentials *cred)
 386 {
 387         cred->machine_account_pending = True;
 388 }
 389
 390
 391 NTSTATUS cli_credentials_update_all_keytabs(TALLOC_CTX *parent_ctx)
 392 {
 393         TALLOC_CTX *mem_ctx;
 394         int ldb_ret;
 395         struct ldb_context *ldb;
 396         struct ldb_message **msgs;
 397         const char *attrs[] = { NULL };
 398         struct cli_credentials *creds;
 399         const char *filter;
 400         NTSTATUS status;
 401         int i, ret;
 402
 403         mem_ctx = talloc_new(parent_ctx);
 404         if (!mem_ctx) {
 405                 return NT_STATUS_NO_MEMORY;
 406         }
 407
 408         /* Local secrets are stored in secrets.ldb */
 409         ldb = secrets_db_connect(mem_ctx);
 410         if (!ldb) {
 411                 DEBUG(1, ("Could not open secrets.ldb\n"));
 412                 talloc_free(mem_ctx);
 413                 return NT_STATUS_ACCESS_DENIED;
 414         }
 415
 416         /* search for the secret record, but only of things we can
 417          * actually update */
 418         ldb_ret = gendb_search(ldb,
 419                                mem_ctx, NULL,
 420                                &msgs, attrs,
 421                                "(&(objectClass=kerberosSecret)(|(secret=*)(ntPwdHash=*)))");
 422         if (ldb_ret == -1) {
 423                 DEBUG(1, ("Error looking for kerberos type secrets to push into a keytab:: %s", ldb_errstring(ldb)));
 424                 talloc_free(mem_ctx);
 425                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 426         }
 427
 428         for (i=0; i < ldb_ret; i++) {
 429                 /* Make a credentials structure from it */
 430                 creds = cli_credentials_init(mem_ctx);
 431                 if (!creds) {
 432                         DEBUG(1, ("cli_credentials_init failed!"));
 433                         talloc_free(mem_ctx);
 434                         return NT_STATUS_NO_MEMORY;
 435                 }
 436                 cli_credentials_set_conf(creds);
 437                 filter = talloc_asprintf(mem_ctx, "dn=%s", ldb_dn_get_linearized(msgs[i]->dn));
 438                 status = cli_credentials_set_secrets(creds, NULL, filter);
 439                 if (!NT_STATUS_IS_OK(status)) {
 440                         DEBUG(1, ("Failed to read secrets for keytab update for %s\n",
 441                                   filter));
 442                         continue;
 443                 }
 444                 ret = cli_credentials_update_keytab(creds);
 445                 if (ret != 0) {
 446                         DEBUG(1, ("Failed to update keytab for %s\n",
 447                                   filter));
 448                         continue;
 449                 }
 450         }
 451         return NT_STATUS_OK;
 452 }
 453