source4/auth/ntlm/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2009
   5    Copyright (C) Gerald Carter                             2003
   6    Copyright (C) Stefan Metzmacher                         2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/time.h"
  24 #include "lib/ldb/include/ldb.h"
  25 #include "../lib/util/util_ldb.h"
  26 #include "libcli/ldap/ldap_ndr.h"
  27 #include "libcli/security/security.h"
  28 #include "auth/auth.h"
  29 #include "../libcli/auth/ntlm_check.h"
  30 #include "auth/ntlm/auth_proto.h"
  31 #include "auth/auth_sam.h"
  32 #include "dsdb/samdb/samdb.h"
  33 #include "dsdb/common/util.h"
  34 #include "param/param.h"
  35
  36 extern const char *user_attrs[];
  37 extern const char *domain_ref_attrs[];
  38
  39 /****************************************************************************
  40  Look for the specified user in the sam, return ldb result structures
  41 ****************************************************************************/
  42
  43 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  44                                        const char *account_name,
  45                                        struct ldb_dn *domain_dn,
  46                                        struct ldb_message **ret_msg)
  47 {
  48         int ret;
  49
  50         /* pull the user attributes */
  51         ret = dsdb_search_one(sam_ctx, mem_ctx, ret_msg, domain_dn, LDB_SCOPE_SUBTREE,
  52                               user_attrs,
  53                               DSDB_SEARCH_SHOW_EXTENDED_DN,
  54                               "(&(sAMAccountName=%s)(objectclass=user))",
  55                               ldb_binary_encode_string(mem_ctx, account_name));
  56         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  57                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  58                          account_name, ldb_dn_get_linearized(domain_dn)));
  59                 return NT_STATUS_NO_SUCH_USER;
  60         }
  61         if (ret != LDB_SUCCESS) {
  62                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  63         }
  64
  65         return NT_STATUS_OK;
  66 }
  67
  68 /****************************************************************************
  69  Do a specific test for an smb password being correct, given a smb_password and
  70  the lanman and NT responses.
  71 ****************************************************************************/
  72 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
  73                                     TALLOC_CTX *mem_ctx,
  74                                     uint16_t acct_flags,
  75                                     const struct samr_Password *lm_pwd,
  76                                     const struct samr_Password *nt_pwd,
  77                                     const struct auth_usersupplied_info *user_info,
  78                                     DATA_BLOB *user_sess_key,
  79                                     DATA_BLOB *lm_sess_key)
  80 {
  81         NTSTATUS status;
  82
  83         switch (user_info->password_state) {
  84         case AUTH_PASSWORD_PLAIN:
  85         {
  86                 const struct auth_usersupplied_info *user_info_temp;
  87                 status = encrypt_user_info(mem_ctx, auth_context,
  88                                            AUTH_PASSWORD_HASH,
  89                                            user_info, &user_info_temp);
  90                 if (!NT_STATUS_IS_OK(status)) {
  91                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  92                         return status;
  93                 }
  94                 user_info = user_info_temp;
  95
  96                 /*fall through*/
  97         }
  98         case AUTH_PASSWORD_HASH:
  99                 *lm_sess_key = data_blob(NULL, 0);
 100                 *user_sess_key = data_blob(NULL, 0);
 101                 status = hash_password_check(mem_ctx,
 102                                              lp_lanman_auth(auth_context->lp_ctx),
 103                                              user_info->password.hash.lanman,
 104                                              user_info->password.hash.nt,
 105                                              user_info->mapped.account_name,
 106                                              lm_pwd, nt_pwd);
 107                 NT_STATUS_NOT_OK_RETURN(status);
 108                 break;
 109
 110         case AUTH_PASSWORD_RESPONSE:
 111                 status = ntlm_password_check(mem_ctx,
 112                                              lp_lanman_auth(auth_context->lp_ctx),
 113                                                  lp_ntlm_auth(auth_context->lp_ctx),
 114                                              user_info->logon_parameters,
 115                                              &auth_context->challenge.data,
 116                                              &user_info->password.response.lanman,
 117                                              &user_info->password.response.nt,
 118                                              user_info->mapped.account_name,
 119                                              user_info->client.account_name,
 120                                              user_info->client.domain_name,
 121                                              lm_pwd, nt_pwd,
 122                                              user_sess_key, lm_sess_key);
 123                 NT_STATUS_NOT_OK_RETURN(status);
 124                 break;
 125         }
 126
 127         if (user_sess_key && user_sess_key->data) {
 128                 talloc_steal(auth_context, user_sess_key->data);
 129         }
 130         if (lm_sess_key && lm_sess_key->data) {
 131                 talloc_steal(auth_context, lm_sess_key->data);
 132         }
 133
 134         return NT_STATUS_OK;
 135 }
 136
 137
 138
 139 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 140                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 141                                      struct ldb_dn *domain_dn,
 142                                      struct ldb_message *msg,
 143                                      const struct auth_usersupplied_info *user_info,
 144                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 145 {
 146         struct samr_Password *lm_pwd, *nt_pwd;
 147         NTSTATUS nt_status;
 148
 149         uint16_t acct_flags = samdb_result_acct_flags(auth_context->sam_ctx, mem_ctx, msg, domain_dn);
 150
 151         /* Quit if the account was locked out. */
 152         if (acct_flags & ACB_AUTOLOCK) {
 153                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 154                          user_info->mapped.account_name));
 155                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 156         }
 157
 158         /* You can only do an interactive login to normal accounts */
 159         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 160                 if (!(acct_flags & ACB_NORMAL)) {
 161                         return NT_STATUS_NO_SUCH_USER;
 162                 }
 163         }
 164
 165         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 166         NT_STATUS_NOT_OK_RETURN(nt_status);
 167
 168         nt_status = authsam_password_ok(auth_context, mem_ctx,
 169                                         acct_flags, lm_pwd, nt_pwd,
 170                                         user_info, user_sess_key, lm_sess_key);
 171         NT_STATUS_NOT_OK_RETURN(nt_status);
 172
 173         nt_status = authsam_account_ok(mem_ctx, auth_context->sam_ctx,
 174                                        user_info->logon_parameters,
 175                                        domain_dn,
 176                                        msg,
 177                                        user_info->workstation_name,
 178                                        user_info->mapped.account_name,
 179                                        false, false);
 180
 181         return nt_status;
 182 }
 183
 184
 185
 186 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 187                                                  TALLOC_CTX *mem_ctx,
 188                                                  const struct auth_usersupplied_info *user_info,
 189                                                  struct auth_serversupplied_info **server_info)
 190 {
 191         NTSTATUS nt_status;
 192         const char *account_name = user_info->mapped.account_name;
 193         struct ldb_message *msg;
 194         struct ldb_dn *domain_dn;
 195         DATA_BLOB user_sess_key, lm_sess_key;
 196         TALLOC_CTX *tmp_ctx;
 197
 198         if (ctx->auth_ctx->sam_ctx == NULL) {
 199                 DEBUG(0, ("No SAM available, cannot log in users\n"));
 200                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 201         }
 202
 203         if (!account_name || !*account_name) {
 204                 /* 'not for me' */
 205                 return NT_STATUS_NOT_IMPLEMENTED;
 206         }
 207
 208         tmp_ctx = talloc_new(mem_ctx);
 209         if (!tmp_ctx) {
 210                 return NT_STATUS_NO_MEMORY;
 211         }
 212
 213         domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 214         if (domain_dn == NULL) {
 215                 talloc_free(tmp_ctx);
 216                 return NT_STATUS_NO_SUCH_DOMAIN;
 217         }
 218
 219         nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
 220         if (!NT_STATUS_IS_OK(nt_status)) {
 221                 talloc_free(tmp_ctx);
 222                 return nt_status;
 223         }
 224
 225         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
 226                                          &user_sess_key, &lm_sess_key);
 227         if (!NT_STATUS_IS_OK(nt_status)) {
 228                 talloc_free(tmp_ctx);
 229                 return nt_status;
 230         }
 231
 232         nt_status = authsam_make_server_info(tmp_ctx, ctx->auth_ctx->sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx),
 233                                              lp_sam_name(ctx->auth_ctx->lp_ctx),
 234                                              domain_dn,
 235                                              msg,
 236                                              user_sess_key, lm_sess_key,
 237                                              server_info);
 238         if (!NT_STATUS_IS_OK(nt_status)) {
 239                 talloc_free(tmp_ctx);
 240                 return nt_status;
 241         }
 242
 243         talloc_steal(mem_ctx, *server_info);
 244         talloc_free(tmp_ctx);
 245
 246         return NT_STATUS_OK;
 247 }
 248
 249 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 250                                                 TALLOC_CTX *mem_ctx,
 251                                                 const struct auth_usersupplied_info *user_info)
 252 {
 253         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 254                 return NT_STATUS_NOT_IMPLEMENTED;
 255         }
 256
 257         return NT_STATUS_OK;
 258 }
 259
 260 /****************************************************************************
 261 Check SAM security (above) but with a few extra checks.
 262 ****************************************************************************/
 263 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 264                                    TALLOC_CTX *mem_ctx,
 265                                    const struct auth_usersupplied_info *user_info)
 266 {
 267         bool is_local_name, is_my_domain;
 268
 269         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 270                 return NT_STATUS_NOT_IMPLEMENTED;
 271         }
 272
 273         is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx,
 274                                   user_info->mapped.domain_name);
 275         is_my_domain  = lp_is_mydomain(ctx->auth_ctx->lp_ctx,
 276                                        user_info->mapped.domain_name);
 277
 278         /* check whether or not we service this domain/workgroup name */
 279         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 280                 case ROLE_STANDALONE:
 281                         return NT_STATUS_OK;
 282
 283                 case ROLE_DOMAIN_MEMBER:
 284                         if (!is_local_name) {
 285                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 286                                         user_info->mapped.domain_name));
 287                                 return NT_STATUS_NOT_IMPLEMENTED;
 288                         }
 289                         return NT_STATUS_OK;
 290
 291                 case ROLE_DOMAIN_CONTROLLER:
 292                         if (!is_local_name && !is_my_domain) {
 293                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 294                                         user_info->mapped.domain_name));
 295                                 return NT_STATUS_NOT_IMPLEMENTED;
 296                         }
 297                         return NT_STATUS_OK;
 298         }
 299
 300         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 301         return NT_STATUS_NOT_IMPLEMENTED;
 302 }
 303
 304
 305 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available, and for tokenGroups in the DSDB stack.
 306
 307  Supply either a principal or a DN
 308 */
 309 NTSTATUS authsam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 310                                            struct auth_context *auth_context,
 311                                            const char *principal,
 312                                            struct ldb_dn *user_dn,
 313                                            struct auth_serversupplied_info **server_info)
 314 {
 315         NTSTATUS nt_status;
 316         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 317         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 318
 319         struct ldb_message *msg;
 320         struct ldb_dn *domain_dn;
 321
 322         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 323         if (!tmp_ctx) {
 324                 return NT_STATUS_NO_MEMORY;
 325         }
 326
 327         if (principal) {
 328                 nt_status = sam_get_results_principal(auth_context->sam_ctx, tmp_ctx, principal,
 329                                                       user_attrs, &domain_dn, &msg);
 330                 if (!NT_STATUS_IS_OK(nt_status)) {
 331                         talloc_free(tmp_ctx);
 332                         return nt_status;
 333                 }
 334         } else if (user_dn) {
 335                 struct dom_sid *user_sid, *domain_sid;
 336                 int ret;
 337                 /* pull the user attributes */
 338                 ret = dsdb_search_one(auth_context->sam_ctx, tmp_ctx, &msg, user_dn,
 339                                       LDB_SCOPE_BASE, user_attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
 340                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 341                         talloc_free(tmp_ctx);
 342                         return NT_STATUS_NO_SUCH_USER;
 343                 } else if (ret != LDB_SUCCESS) {
 344                         talloc_free(tmp_ctx);
 345                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 346                 }
 347
 348                 user_sid = samdb_result_dom_sid(msg, msg, "objectSid");
 349
 350                 nt_status = dom_sid_split_rid(tmp_ctx, user_sid, &domain_sid, NULL);
 351                 if (!NT_STATUS_IS_OK(nt_status)) {
 352                         return nt_status;
 353                 }
 354
 355                 domain_dn = samdb_search_dn(auth_context->sam_ctx, mem_ctx, NULL,
 356                                           "(&(objectSid=%s)(objectClass=domain))",
 357                                             ldap_encode_ndr_dom_sid(tmp_ctx, domain_sid));
 358                 if (!domain_dn) {
 359                         DEBUG(3, ("authsam_get_server_info_principal: Failed to find domain with: SID %s\n",
 360                                   dom_sid_string(tmp_ctx, domain_sid)));
 361                         return NT_STATUS_NO_SUCH_USER;
 362                 }
 363
 364         } else {
 365                 return NT_STATUS_INVALID_PARAMETER;
 366         }
 367
 368         nt_status = authsam_make_server_info(tmp_ctx, auth_context->sam_ctx,
 369                                              lp_netbios_name(auth_context->lp_ctx),
 370                                              lp_workgroup(auth_context->lp_ctx),
 371                                              domain_dn,
 372                                              msg,
 373                                              user_sess_key, lm_sess_key,
 374                                              server_info);
 375         if (!NT_STATUS_IS_OK(nt_status)) {
 376                 talloc_free(tmp_ctx);
 377                 return nt_status;
 378         }
 379
 380         talloc_steal(mem_ctx, *server_info);
 381         talloc_free(tmp_ctx);
 382
 383         return NT_STATUS_OK;
 384 }
 385
 386 static const struct auth_operations sam_ignoredomain_ops = {
 387         .name                      = "sam_ignoredomain",
 388         .get_challenge             = auth_get_challenge_not_implemented,
 389         .want_check                = authsam_ignoredomain_want_check,
 390         .check_password            = authsam_check_password_internals,
 391         .get_server_info_principal = authsam_get_server_info_principal
 392 };
 393
 394 static const struct auth_operations sam_ops = {
 395         .name                      = "sam",
 396         .get_challenge             = auth_get_challenge_not_implemented,
 397         .want_check                = authsam_want_check,
 398         .check_password            = authsam_check_password_internals,
 399         .get_server_info_principal = authsam_get_server_info_principal
 400 };
 401
 402 _PUBLIC_ NTSTATUS auth_sam_init(void)
 403 {
 404         NTSTATUS ret;
 405
 406         ret = auth_register(&sam_ops);
 407         if (!NT_STATUS_IS_OK(ret)) {
 408                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 409                 return ret;
 410         }
 411
 412         ret = auth_register(&sam_ignoredomain_ops);
 413         if (!NT_STATUS_IS_OK(ret)) {
 414                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 415                 return ret;
 416         }
 417
 418         return ret;
 419 }