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 3 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, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.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 "../lib/util/util_ldb.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "auth/credentials/credentials_krb5.h"
  33 #include "param/param.h"
  34 #include "lib/events/events.h"
  35
  36 /**
  37  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
  38  *
  39  * @param credentials Credentials structure on which to set the password
  40  * @param fd open file descriptor to read the password from
  41  * @param obtained This enum describes how 'specified' this password is
  42  */
  43
  44 _PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials,
  45                                        int fd, enum credentials_obtained obtained)
  46 {
  47         char *p;
  48         char pass[128];
  49
  50         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
  51                 p && p - pass < sizeof(pass);) {
  52                 switch (read(fd, p, 1)) {
  53                 case 1:
  54                         if (*p != '\n' && *p != '\0') {
  55                                 *++p = '\0'; /* advance p, and null-terminate pass */
  56                                 break;
  57                         }
  58                         /* fall through */
  59                 case 0:
  60                         if (p - pass) {
  61                                 *p = '\0'; /* null-terminate it, just in case... */
  62                                 p = NULL; /* then force the loop condition to become false */
  63                                 break;
  64                         } else {
  65                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
  66                                 return false;
  67                         }
  68
  69                 default:
  70                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
  71                                         fd, strerror(errno));
  72                         return false;
  73                 }
  74         }
  75
  76         cli_credentials_set_password(credentials, pass, obtained);
  77         return true;
  78 }
  79
  80 /**
  81  * Read a named file, and parse it for a password
  82  *
  83  * @param credentials Credentials structure on which to set the password
  84  * @param file a named file to read the password from
  85  * @param obtained This enum describes how 'specified' this password is
  86  */
  87
  88 _PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
  89 {
  90         int fd = open(file, O_RDONLY, 0);
  91         bool ret;
  92
  93         if (fd < 0) {
  94                 fprintf(stderr, "Error opening password file %s: %s\n",
  95                                 file, strerror(errno));
  96                 return false;
  97         }
  98
  99         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
 100
 101         close(fd);
 102
 103         return ret;
 104 }
 105
 106 /**
 107  * Read a named file, and parse it for username, domain, realm and password
 108  *
 109  * @param credentials Credentials structure on which to set the password
 110  * @param file a named file to read the details from
 111  * @param obtained This enum describes how 'specified' this password is
 112  */
 113
 114 _PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
 115 {
 116         uint16_t len = 0;
 117         char *ptr, *val, *param;
 118         char **lines;
 119         int i, numlines;
 120
 121         lines = file_lines_load(file, &numlines, 0, NULL);
 122
 123         if (lines == NULL)
 124         {
 125                 /* fail if we can't open the credentials file */
 126                 d_printf("ERROR: Unable to open credentials file!\n");
 127                 return false;
 128         }
 129
 130         for (i = 0; i < numlines; i++) {
 131                 len = strlen(lines[i]);
 132
 133                 if (len == 0)
 134                         continue;
 135
 136                 /* break up the line into parameter & value.
 137                  * will need to eat a little whitespace possibly */
 138                 param = lines[i];
 139                 if (!(ptr = strchr_m (lines[i], '=')))
 140                         continue;
 141
 142                 val = ptr+1;
 143                 *ptr = '\0';
 144
 145                 /* eat leading white space */
 146                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
 147                         val++;
 148
 149                 if (strwicmp("password", param) == 0) {
 150                         cli_credentials_set_password(cred, val, obtained);
 151                 } else if (strwicmp("username", param) == 0) {
 152                         cli_credentials_set_username(cred, val, obtained);
 153                 } else if (strwicmp("domain", param) == 0) {
 154                         cli_credentials_set_domain(cred, val, obtained);
 155                 } else if (strwicmp("realm", param) == 0) {
 156                         cli_credentials_set_realm(cred, val, obtained);
 157                 }
 158                 memset(lines[i], 0, len);
 159         }
 160
 161         talloc_free(lines);
 162
 163         return true;
 164 }
 165
 166
 167 /**
 168  * Fill in credentials for the machine trust account, from the secrets database.
 169  *
 170  * @param cred Credentials structure to fill in
 171  * @retval NTSTATUS error detailing any failure
 172  */
 173 _PUBLIC_ NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
 174                                               struct event_context *event_ctx,
 175                                      struct loadparm_context *lp_ctx,
 176                                      struct ldb_context *ldb,
 177                                      const char *base,
 178                                      const char *filter)
 179 {
 180         TALLOC_CTX *mem_ctx;
 181
 182         int ldb_ret;
 183         struct ldb_message **msgs;
 184         const char *attrs[] = {
 185                 "secret",
 186                 "priorSecret",
 187                 "samAccountName",
 188                 "flatname",
 189                 "realm",
 190                 "secureChannelType",
 191                 "unicodePwd",
 192                 "msDS-KeyVersionNumber",
 193                 "saltPrincipal",
 194                 "privateKeytab",
 195                 "krb5Keytab",
 196                 "servicePrincipalName",
 197                 "ldapBindDn",
 198                 NULL
 199         };
 200
 201         const char *machine_account;
 202         const char *password;
 203         const char *old_password;
 204         const char *domain;
 205         const char *realm;
 206         enum netr_SchannelType sct;
 207         const char *salt_principal;
 208         const char *keytab;
 209
 210         /* ok, we are going to get it now, don't recurse back here */
 211         cred->machine_account_pending = false;
 212
 213         /* some other parts of the system will key off this */
 214         cred->machine_account = true;
 215
 216         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
 217
 218         if (!ldb) {
 219                 /* Local secrets are stored in secrets.ldb */
 220                 ldb = secrets_db_connect(mem_ctx, event_ctx, lp_ctx);
 221                 if (!ldb) {
 222                         /* set anonymous as the fallback, if the machine account won't work */
 223                         cli_credentials_set_anonymous(cred);
 224                         DEBUG(1, ("Could not open secrets.ldb\n"));
 225                         talloc_free(mem_ctx);
 226                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 227                 }
 228         }
 229
 230         /* search for the secret record */
 231         ldb_ret = gendb_search(ldb,
 232                                mem_ctx, ldb_dn_new(mem_ctx, ldb, base),
 233                                &msgs, attrs,
 234                                "%s", filter);
 235         if (ldb_ret == 0) {
 236                 DEBUG(5, ("(normal if no LDAP backend required) Could not find entry to match filter: '%s' base: '%s'\n",
 237                           filter, base));
 238                 /* set anonymous as the fallback, if the machine account won't work */
 239                 cli_credentials_set_anonymous(cred);
 240                 talloc_free(mem_ctx);
 241                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 242         } else if (ldb_ret != 1) {
 243                 DEBUG(5, ("Found more than one (%d) entry to match filter: '%s' base: '%s'\n",
 244                           ldb_ret, filter, base));
 245                 /* set anonymous as the fallback, if the machine account won't work */
 246                 cli_credentials_set_anonymous(cred);
 247                 talloc_free(mem_ctx);
 248                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 249         }
 250
 251         password = ldb_msg_find_attr_as_string(msgs[0], "secret", NULL);
 252         old_password = ldb_msg_find_attr_as_string(msgs[0], "priorSecret", NULL);
 253
 254         machine_account = ldb_msg_find_attr_as_string(msgs[0], "samAccountName", NULL);
 255
 256         if (!machine_account) {
 257                 machine_account = ldb_msg_find_attr_as_string(msgs[0], "servicePrincipalName", NULL);
 258
 259                 if (!machine_account) {
 260                         const char *ldap_bind_dn = ldb_msg_find_attr_as_string(msgs[0], "ldapBindDn", NULL);
 261                         if (!ldap_bind_dn) {
 262                                 DEBUG(1, ("Could not find 'samAccountName', 'servicePrincipalName' or 'ldapBindDn' in secrets record: filter: '%s' base: '%s'\n",
 263                                           filter, base));
 264                                 /* set anonymous as the fallback, if the machine account won't work */
 265                                 cli_credentials_set_anonymous(cred);
 266                                 talloc_free(mem_ctx);
 267                                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 268                         }
 269                 }
 270         }
 271
 272         salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL);
 273         cli_credentials_set_salt_principal(cred, salt_principal);
 274
 275         sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0);
 276         if (sct) {
 277                 cli_credentials_set_secure_channel_type(cred, sct);
 278         }
 279
 280         if (!password) {
 281                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "unicodePwd");
 282                 struct samr_Password hash;
 283                 ZERO_STRUCT(hash);
 284                 if (nt_password_hash) {
 285                         memcpy(hash.hash, nt_password_hash->data,
 286                                MIN(nt_password_hash->length, sizeof(hash.hash)));
 287
 288                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
 289                 } else {
 290                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 291                 }
 292         } else {
 293                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
 294         }
 295
 296
 297         domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL);
 298         if (domain) {
 299                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
 300         }
 301
 302         realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL);
 303         if (realm) {
 304                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 305         }
 306
 307         if (machine_account) {
 308                 cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
 309         }
 310
 311         cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0));
 312
 313         /* If there was an external keytab specified by reference in
 314          * the LDB, then use this.  Otherwise we will make one up
 315          * (chewing CPU time) from the password */
 316         keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL);
 317         if (keytab) {
 318                 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
 319         } else {
 320                 keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL);
 321                 if (keytab) {
 322                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, lp_ctx, keytab));
 323                         if (keytab) {
 324                                 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
 325                         }
 326                 }
 327         }
 328         talloc_free(mem_ctx);
 329
 330         return NT_STATUS_OK;
 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 _PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred,
 340                                                       struct loadparm_context *lp_ctx)
 341 {
 342         NTSTATUS status;
 343         char *filter;
 344         /* Bleh, nasty recursion issues: We are setting a machine
 345          * account here, so we don't want the 'pending' flag around
 346          * any more */
 347         cred->machine_account_pending = false;
 348         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
 349                                        cli_credentials_get_domain(cred));
 350         status = cli_credentials_set_secrets(cred, event_context_find(cred), lp_ctx, NULL,
 351                                            SECRETS_PRIMARY_DOMAIN_DN,
 352                                            filter);
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 DEBUG(1, ("Could not find machine account in secrets database: %s", nt_errstr(status)));
 355         }
 356         return status;
 357 }
 358
 359 /**
 360  * Fill in credentials for the machine trust account, from the secrets database.
 361  *
 362  * @param cred Credentials structure to fill in
 363  * @retval NTSTATUS error detailing any failure
 364  */
 365 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred,
 366                                     struct event_context *event_ctx,
 367                                     struct loadparm_context *lp_ctx)
 368 {
 369         NTSTATUS status;
 370         char *filter;
 371         /* Bleh, nasty recursion issues: We are setting a machine
 372          * account here, so we don't want the 'pending' flag around
 373          * any more */
 374         cred->machine_account_pending = false;
 375         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
 376                                        cli_credentials_get_realm(cred),
 377                                        cli_credentials_get_domain(cred));
 378         status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL,
 379                                            SECRETS_PRINCIPALS_DN,
 380                                            filter);
 381         if (!NT_STATUS_IS_OK(status)) {
 382                 DEBUG(1, ("Could not find krbtgt (master Kerberos) account in secrets database: %s", nt_errstr(status)));
 383         }
 384         return status;
 385 }
 386
 387 /**
 388  * Fill in credentials for a particular prinicpal, from the secrets database.
 389  *
 390  * @param cred Credentials structure to fill in
 391  * @retval NTSTATUS error detailing any failure
 392  */
 393 _PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
 394                                                        struct event_context *event_ctx,
 395                                               struct loadparm_context *lp_ctx,
 396                                               const char *serviceprincipal)
 397 {
 398         NTSTATUS status;
 399         char *filter;
 400         /* Bleh, nasty recursion issues: We are setting a machine
 401          * account here, so we don't want the 'pending' flag around
 402          * any more */
 403         cred->machine_account_pending = false;
 404         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
 405                                  cli_credentials_get_realm(cred),
 406                                  cli_credentials_get_domain(cred),
 407                                  serviceprincipal);
 408         status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL,
 409                                            SECRETS_PRINCIPALS_DN, filter);
 410         if (!NT_STATUS_IS_OK(status)) {
 411                 DEBUG(1, ("Could not find %s principal in secrets database: %s", serviceprincipal, nt_errstr(status)));
 412         }
 413         return status;
 414 }
 415
 416 /**
 417  * Ask that when required, the credentials system will be filled with
 418  * machine trust account, from the secrets database.
 419  *
 420  * @param cred Credentials structure to fill in
 421  * @note This function is used to call the above function after, rather
 422  *       than during, popt processing.
 423  *
 424  */
 425 _PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred,
 426                                                  struct loadparm_context *lp_ctx)
 427 {
 428         cred->machine_account_pending = true;
 429         cred->machine_account_pending_lp_ctx = lp_ctx;
 430 }
 431
 432