source4/auth/credentials/credentials_secrets.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 "auth/kerberos/kerberos_util.h"
  34 #include "param/param.h"
  35 #include "lib/events/events.h"
  36 #include "dsdb/samdb/samdb.h"
  37
  38 /**
  39  * Fill in credentials for the machine trust account, from the secrets database.
  40  *
  41  * @param cred Credentials structure to fill in
  42  * @retval NTSTATUS error detailing any failure
  43  */
  44 _PUBLIC_ NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
  45                                               struct loadparm_context *lp_ctx,
  46                                               struct ldb_context *ldb,
  47                                               const char *base,
  48                                               const char *filter,
  49                                               char **error_string)
  50 {
  51         TALLOC_CTX *mem_ctx;
  52
  53         int ldb_ret;
  54         struct ldb_message *msg;
  55
  56         const char *machine_account;
  57         const char *password;
  58         const char *old_password;
  59         const char *domain;
  60         const char *realm;
  61         enum netr_SchannelType sct;
  62         const char *salt_principal;
  63         char *keytab;
  64         const struct ldb_val *whenChanged;
  65
  66         /* ok, we are going to get it now, don't recurse back here */
  67         cred->machine_account_pending = false;
  68
  69         /* some other parts of the system will key off this */
  70         cred->machine_account = true;
  71
  72         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
  73
  74         if (!ldb) {
  75                 /* Local secrets are stored in secrets.ldb */
  76                 ldb = secrets_db_connect(mem_ctx, lp_ctx);
  77                 if (!ldb) {
  78                         /* set anonymous as the fallback, if the machine account won't work */
  79                         cli_credentials_set_anonymous(cred);
  80                         *error_string = talloc_strdup(cred, "Could not open secrets.ldb");
  81                         talloc_free(mem_ctx);
  82                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
  83                 }
  84         }
  85
  86         ldb_ret = dsdb_search_one(ldb, mem_ctx, &msg,
  87                                   ldb_dn_new(mem_ctx, ldb, base),
  88                                   LDB_SCOPE_SUBTREE,
  89                                   NULL, 0, "%s", filter);
  90
  91         if (ldb_ret != LDB_SUCCESS) {
  92                 *error_string = talloc_asprintf(cred, "Could not find entry to match filter: '%s' base: '%s': %s: %s\n",
  93                                                 filter, base ? base : "",
  94                                                 ldb_strerror(ldb_ret), ldb_errstring(ldb));
  95                 /* set anonymous as the fallback, if the machine account won't work */
  96                 cli_credentials_set_anonymous(cred);
  97                 talloc_free(mem_ctx);
  98                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
  99         }
 100
 101         password = ldb_msg_find_attr_as_string(msg, "secret", NULL);
 102         old_password = ldb_msg_find_attr_as_string(msg, "priorSecret", NULL);
 103
 104         machine_account = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 105
 106         if (!machine_account) {
 107                 machine_account = ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL);
 108
 109                 if (!machine_account) {
 110                         const char *ldap_bind_dn = ldb_msg_find_attr_as_string(msg, "ldapBindDn", NULL);
 111                         if (!ldap_bind_dn) {
 112                                 *error_string = talloc_asprintf(cred,
 113                                                                 "Could not find 'samAccountName', "
 114                                                                 "'servicePrincipalName' or "
 115                                                                 "'ldapBindDn' in secrets record: %s",
 116                                                                 ldb_dn_get_linearized(msg->dn));
 117                                 /* set anonymous as the fallback, if the machine account won't work */
 118                                 cli_credentials_set_anonymous(cred);
 119                                 talloc_free(mem_ctx);
 120                                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 121                         } else {
 122                                 /* store bind dn in credentials */
 123                                 cli_credentials_set_bind_dn(cred, ldap_bind_dn);
 124                         }
 125                 }
 126         }
 127
 128         salt_principal = ldb_msg_find_attr_as_string(msg, "saltPrincipal", NULL);
 129         cli_credentials_set_salt_principal(cred, salt_principal);
 130
 131         sct = ldb_msg_find_attr_as_int(msg, "secureChannelType", 0);
 132         if (sct) {
 133                 cli_credentials_set_secure_channel_type(cred, sct);
 134         }
 135
 136         if (!password) {
 137                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msg, "unicodePwd");
 138                 struct samr_Password hash;
 139                 ZERO_STRUCT(hash);
 140                 if (nt_password_hash) {
 141                         memcpy(hash.hash, nt_password_hash->data,
 142                                MIN(nt_password_hash->length, sizeof(hash.hash)));
 143
 144                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
 145                 } else {
 146                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 147                 }
 148         } else {
 149                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
 150         }
 151
 152
 153         domain = ldb_msg_find_attr_as_string(msg, "flatname", NULL);
 154         if (domain) {
 155                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
 156         }
 157
 158         realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
 159         if (realm) {
 160                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 161         }
 162
 163         if (machine_account) {
 164                 cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
 165         }
 166
 167         cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0));
 168
 169         whenChanged = ldb_msg_find_ldb_val(msg, "whenChanged");
 170         if (whenChanged) {
 171                 time_t lct;
 172                 if (ldb_val_to_time(whenChanged, &lct) == LDB_SUCCESS) {
 173                         cli_credentials_set_password_last_changed_time(cred, lct);
 174                 }
 175         }
 176
 177         /* If there was an external keytab specified by reference in
 178          * the LDB, then use this.  Otherwise we will make one up
 179          * (chewing CPU time) from the password */
 180         keytab = keytab_name_from_msg(cred, ldb, msg);
 181         if (keytab) {
 182                 cli_credentials_set_keytab_name(cred, lp_ctx, keytab, CRED_SPECIFIED);
 183                 talloc_free(keytab);
 184         }
 185         talloc_free(mem_ctx);
 186
 187         return NT_STATUS_OK;
 188 }
 189
 190 /**
 191  * Fill in credentials for the machine trust account, from the secrets database.
 192  *
 193  * @param cred Credentials structure to fill in
 194  * @retval NTSTATUS error detailing any failure
 195  */
 196 _PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred,
 197                                                       struct loadparm_context *lp_ctx)
 198 {
 199         NTSTATUS status;
 200         char *filter;
 201         char *error_string;
 202         /* Bleh, nasty recursion issues: We are setting a machine
 203          * account here, so we don't want the 'pending' flag around
 204          * any more */
 205         cred->machine_account_pending = false;
 206         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
 207                                  cli_credentials_get_domain(cred));
 208         status = cli_credentials_set_secrets(cred, lp_ctx, NULL,
 209                                              SECRETS_PRIMARY_DOMAIN_DN,
 210                                              filter, &error_string);
 211         if (!NT_STATUS_IS_OK(status)) {
 212                 DEBUG(1, ("Could not find machine account in secrets database: %s: %s", nt_errstr(status), error_string));
 213                 talloc_free(error_string);
 214         }
 215         return status;
 216 }
 217
 218 /**
 219  * Fill in credentials for the machine trust account, from the secrets database.
 220  *
 221  * @param cred Credentials structure to fill in
 222  * @retval NTSTATUS error detailing any failure
 223  */
 224 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred,
 225                                     struct loadparm_context *lp_ctx)
 226 {
 227         NTSTATUS status;
 228         char *filter;
 229         char *error_string;
 230         /* Bleh, nasty recursion issues: We are setting a machine
 231          * account here, so we don't want the 'pending' flag around
 232          * any more */
 233         cred->machine_account_pending = false;
 234         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
 235                                        cli_credentials_get_realm(cred),
 236                                        cli_credentials_get_domain(cred));
 237         status = cli_credentials_set_secrets(cred, lp_ctx, NULL,
 238                                              SECRETS_PRINCIPALS_DN,
 239                                              filter, &error_string);
 240         if (!NT_STATUS_IS_OK(status)) {
 241                 DEBUG(1, ("Could not find krbtgt (master Kerberos) account in secrets database: %s: %s", nt_errstr(status), error_string));
 242                 talloc_free(error_string);
 243         }
 244         return status;
 245 }
 246
 247 /**
 248  * Fill in credentials for a particular prinicpal, from the secrets database.
 249  *
 250  * @param cred Credentials structure to fill in
 251  * @retval NTSTATUS error detailing any failure
 252  */
 253 _PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
 254                                               struct loadparm_context *lp_ctx,
 255                                               const char *serviceprincipal)
 256 {
 257         NTSTATUS status;
 258         char *filter;
 259         char *error_string;
 260         /* Bleh, nasty recursion issues: We are setting a machine
 261          * account here, so we don't want the 'pending' flag around
 262          * any more */
 263         cred->machine_account_pending = false;
 264         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
 265                                  cli_credentials_get_realm(cred),
 266                                  cli_credentials_get_domain(cred),
 267                                  serviceprincipal);
 268         status = cli_credentials_set_secrets(cred, lp_ctx, NULL,
 269                                              SECRETS_PRINCIPALS_DN, filter,
 270                                              &error_string);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 DEBUG(1, ("Could not find %s principal in secrets database: %s: %s", serviceprincipal, nt_errstr(status), error_string));
 273         }
 274         return status;
 275 }
 276
 277 /**
 278  * Ask that when required, the credentials system will be filled with
 279  * machine trust account, from the secrets database.
 280  *
 281  * @param cred Credentials structure to fill in
 282  * @note This function is used to call the above function after, rather
 283  *       than during, popt processing.
 284  *
 285  */
 286 _PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred,
 287                                                  struct loadparm_context *lp_ctx)
 288 {
 289         cred->machine_account_pending = true;
 290         cred->machine_account_pending_lp_ctx = lp_ctx;
 291 }
 292
 293