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 "auth/auth.h"
  27 #include "../libcli/auth/ntlm_check.h"
  28 #include "auth/ntlm/auth_proto.h"
  29 #include "auth/auth_sam.h"
  30 #include "dsdb/samdb/samdb.h"
  31 #include "param/param.h"
  32
  33 extern const char *user_attrs[];
  34 extern const char *domain_ref_attrs[];
  35
  36 /****************************************************************************
  37  Look for the specified user in the sam, return ldb result structures
  38 ****************************************************************************/
  39
  40 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  41                                        const char *account_name,
  42                                        struct ldb_dn *domain_dn,
  43                                        struct ldb_message **ret_msg)
  44 {
  45         int ret;
  46
  47         /* pull the user attributes */
  48         ret = gendb_search_single_extended_dn(sam_ctx, mem_ctx, domain_dn, LDB_SCOPE_SUBTREE,
  49                                               ret_msg, user_attrs,
  50                                               "(&(sAMAccountName=%s)(objectclass=user))",
  51                                               ldb_binary_encode_string(mem_ctx, account_name));
  52         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  53                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  54                          account_name, ldb_dn_get_linearized(domain_dn)));
  55                 return NT_STATUS_NO_SUCH_USER;
  56         }
  57         if (ret != LDB_SUCCESS) {
  58                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  59         }
  60
  61         return NT_STATUS_OK;
  62 }
  63
  64 /****************************************************************************
  65  Do a specific test for an smb password being correct, given a smb_password and
  66  the lanman and NT responses.
  67 ****************************************************************************/
  68 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
  69                                     TALLOC_CTX *mem_ctx,
  70                                     uint16_t acct_flags,
  71                                     const struct samr_Password *lm_pwd,
  72                                     const struct samr_Password *nt_pwd,
  73                                     const struct auth_usersupplied_info *user_info,
  74                                     DATA_BLOB *user_sess_key,
  75                                     DATA_BLOB *lm_sess_key)
  76 {
  77         NTSTATUS status;
  78
  79         switch (user_info->password_state) {
  80         case AUTH_PASSWORD_PLAIN:
  81         {
  82                 const struct auth_usersupplied_info *user_info_temp;
  83                 status = encrypt_user_info(mem_ctx, auth_context,
  84                                            AUTH_PASSWORD_HASH,
  85                                            user_info, &user_info_temp);
  86                 if (!NT_STATUS_IS_OK(status)) {
  87                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  88                         return status;
  89                 }
  90                 user_info = user_info_temp;
  91
  92                 /*fall through*/
  93         }
  94         case AUTH_PASSWORD_HASH:
  95                 *lm_sess_key = data_blob(NULL, 0);
  96                 *user_sess_key = data_blob(NULL, 0);
  97                 status = hash_password_check(mem_ctx,
  98                                              lp_lanman_auth(auth_context->lp_ctx),
  99                                              user_info->password.hash.lanman,
 100                                              user_info->password.hash.nt,
 101                                              user_info->mapped.account_name,
 102                                              lm_pwd, nt_pwd);
 103                 NT_STATUS_NOT_OK_RETURN(status);
 104                 break;
 105
 106         case AUTH_PASSWORD_RESPONSE:
 107                 status = ntlm_password_check(mem_ctx,
 108                                              lp_lanman_auth(auth_context->lp_ctx),
 109                                                  lp_ntlm_auth(auth_context->lp_ctx),
 110                                              user_info->logon_parameters,
 111                                              &auth_context->challenge.data,
 112                                              &user_info->password.response.lanman,
 113                                              &user_info->password.response.nt,
 114                                              user_info->mapped.account_name,
 115                                              user_info->client.account_name,
 116                                              user_info->client.domain_name,
 117                                              lm_pwd, nt_pwd,
 118                                              user_sess_key, lm_sess_key);
 119                 NT_STATUS_NOT_OK_RETURN(status);
 120                 break;
 121         }
 122
 123         if (user_sess_key && user_sess_key->data) {
 124                 talloc_steal(auth_context, user_sess_key->data);
 125         }
 126         if (lm_sess_key && lm_sess_key->data) {
 127                 talloc_steal(auth_context, lm_sess_key->data);
 128         }
 129
 130         return NT_STATUS_OK;
 131 }
 132
 133
 134
 135 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 136                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 137                                      struct ldb_dn *domain_dn,
 138                                      struct ldb_message *msg,
 139                                      const struct auth_usersupplied_info *user_info,
 140                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 141 {
 142         struct samr_Password *lm_pwd, *nt_pwd;
 143         NTSTATUS nt_status;
 144
 145         uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 146
 147         /* Quit if the account was locked out. */
 148         if (acct_flags & ACB_AUTOLOCK) {
 149                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 150                          user_info->mapped.account_name));
 151                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 152         }
 153
 154         /* You can only do an interactive login to normal accounts */
 155         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 156                 if (!(acct_flags & ACB_NORMAL)) {
 157                         return NT_STATUS_NO_SUCH_USER;
 158                 }
 159         }
 160
 161         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 162         NT_STATUS_NOT_OK_RETURN(nt_status);
 163
 164         nt_status = authsam_password_ok(auth_context, mem_ctx,
 165                                         acct_flags, lm_pwd, nt_pwd,
 166                                         user_info, user_sess_key, lm_sess_key);
 167         NT_STATUS_NOT_OK_RETURN(nt_status);
 168
 169         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 170                                        user_info->logon_parameters,
 171                                        domain_dn,
 172                                        msg,
 173                                        user_info->workstation_name,
 174                                        user_info->mapped.account_name,
 175                                        false, false);
 176
 177         return nt_status;
 178 }
 179
 180
 181
 182 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 183                                                  TALLOC_CTX *mem_ctx,
 184                                                  const struct auth_usersupplied_info *user_info,
 185                                                  struct auth_serversupplied_info **server_info)
 186 {
 187         NTSTATUS nt_status;
 188         const char *account_name = user_info->mapped.account_name;
 189         struct ldb_message *msg;
 190         struct ldb_context *sam_ctx;
 191         struct ldb_dn *domain_dn;
 192         DATA_BLOB user_sess_key, lm_sess_key;
 193         TALLOC_CTX *tmp_ctx;
 194
 195         if (!account_name || !*account_name) {
 196                 /* 'not for me' */
 197                 return NT_STATUS_NOT_IMPLEMENTED;
 198         }
 199
 200         tmp_ctx = talloc_new(mem_ctx);
 201         if (!tmp_ctx) {
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204
 205         sam_ctx = samdb_connect(tmp_ctx, ctx->auth_ctx->event_ctx, ctx->auth_ctx->lp_ctx, system_session(ctx->auth_ctx->lp_ctx));
 206         if (sam_ctx == NULL) {
 207                 talloc_free(tmp_ctx);
 208                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 209         }
 210
 211         domain_dn = ldb_get_default_basedn(sam_ctx);
 212         if (domain_dn == NULL) {
 213                 talloc_free(tmp_ctx);
 214                 return NT_STATUS_NO_SUCH_DOMAIN;
 215         }
 216
 217         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain_dn, &msg);
 218         if (!NT_STATUS_IS_OK(nt_status)) {
 219                 talloc_free(tmp_ctx);
 220                 return nt_status;
 221         }
 222
 223         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, domain_dn, msg, user_info,
 224                                          &user_sess_key, &lm_sess_key);
 225         if (!NT_STATUS_IS_OK(nt_status)) {
 226                 talloc_free(tmp_ctx);
 227                 return nt_status;
 228         }
 229
 230         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx),
 231                                              lp_sam_name(ctx->auth_ctx->lp_ctx),
 232                                              domain_dn,
 233                                              msg,
 234                                              user_sess_key, lm_sess_key,
 235                                              server_info);
 236         if (!NT_STATUS_IS_OK(nt_status)) {
 237                 talloc_free(tmp_ctx);
 238                 return nt_status;
 239         }
 240
 241         talloc_steal(mem_ctx, *server_info);
 242         talloc_free(tmp_ctx);
 243
 244         return NT_STATUS_OK;
 245 }
 246
 247 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 248                                                 TALLOC_CTX *mem_ctx,
 249                                                 const struct auth_usersupplied_info *user_info)
 250 {
 251         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 252                 return NT_STATUS_NOT_IMPLEMENTED;
 253         }
 254
 255         return NT_STATUS_OK;
 256 }
 257
 258 /****************************************************************************
 259 Check SAM security (above) but with a few extra checks.
 260 ****************************************************************************/
 261 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 262                                    TALLOC_CTX *mem_ctx,
 263                                    const struct auth_usersupplied_info *user_info)
 264 {
 265         bool is_local_name, is_my_domain;
 266
 267         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 268                 return NT_STATUS_NOT_IMPLEMENTED;
 269         }
 270
 271         is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx,
 272                                   user_info->mapped.domain_name);
 273         is_my_domain  = lp_is_mydomain(ctx->auth_ctx->lp_ctx,
 274                                        user_info->mapped.domain_name);
 275
 276         /* check whether or not we service this domain/workgroup name */
 277         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 278                 case ROLE_STANDALONE:
 279                         return NT_STATUS_OK;
 280
 281                 case ROLE_DOMAIN_MEMBER:
 282                         if (!is_local_name) {
 283                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 284                                         user_info->mapped.domain_name));
 285                                 return NT_STATUS_NOT_IMPLEMENTED;
 286                         }
 287                         return NT_STATUS_OK;
 288
 289                 case ROLE_DOMAIN_CONTROLLER:
 290                         if (!is_local_name && !is_my_domain) {
 291                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 292                                         user_info->mapped.domain_name));
 293                                 return NT_STATUS_NOT_IMPLEMENTED;
 294                         }
 295                         return NT_STATUS_OK;
 296         }
 297
 298         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 299         return NT_STATUS_NOT_IMPLEMENTED;
 300 }
 301
 302
 303 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 304 NTSTATUS authsam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 305                                            struct auth_context *auth_context,
 306                                            const char *principal,
 307                                            struct auth_serversupplied_info **server_info)
 308 {
 309         NTSTATUS nt_status;
 310         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 311         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 312
 313         struct ldb_message *msg;
 314         struct ldb_context *sam_ctx;
 315         struct ldb_dn *domain_dn;
 316
 317         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 318         if (!tmp_ctx) {
 319                 return NT_STATUS_NO_MEMORY;
 320         }
 321
 322         sam_ctx = samdb_connect(tmp_ctx, auth_context->event_ctx, auth_context->lp_ctx,
 323                                 system_session(auth_context->lp_ctx));
 324         if (sam_ctx == NULL) {
 325                 talloc_free(tmp_ctx);
 326                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 327         }
 328
 329         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 330                                               user_attrs, &domain_dn, &msg);
 331         if (!NT_STATUS_IS_OK(nt_status)) {
 332                 talloc_free(tmp_ctx);
 333                 return nt_status;
 334         }
 335
 336         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 337                                              lp_netbios_name(auth_context->lp_ctx),
 338                                              lp_workgroup(auth_context->lp_ctx),
 339                                              domain_dn,
 340                                              msg,
 341                                              user_sess_key, lm_sess_key,
 342                                              server_info);
 343         if (!NT_STATUS_IS_OK(nt_status)) {
 344                 talloc_free(tmp_ctx);
 345                 return nt_status;
 346         }
 347
 348         talloc_steal(mem_ctx, *server_info);
 349         talloc_free(tmp_ctx);
 350
 351         return NT_STATUS_OK;
 352 }
 353
 354 static const struct auth_operations sam_ignoredomain_ops = {
 355         .name                      = "sam_ignoredomain",
 356         .get_challenge             = auth_get_challenge_not_implemented,
 357         .want_check                = authsam_ignoredomain_want_check,
 358         .check_password            = authsam_check_password_internals,
 359         .get_server_info_principal = authsam_get_server_info_principal
 360 };
 361
 362 static const struct auth_operations sam_ops = {
 363         .name                      = "sam",
 364         .get_challenge             = auth_get_challenge_not_implemented,
 365         .want_check                = authsam_want_check,
 366         .check_password            = authsam_check_password_internals,
 367         .get_server_info_principal = authsam_get_server_info_principal
 368 };
 369
 370 _PUBLIC_ NTSTATUS auth_sam_init(void)
 371 {
 372         NTSTATUS ret;
 373
 374         ret = auth_register(&sam_ops);
 375         if (!NT_STATUS_IS_OK(ret)) {
 376                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 377                 return ret;
 378         }
 379
 380         ret = auth_register(&sam_ignoredomain_ops);
 381         if (!NT_STATUS_IS_OK(ret)) {
 382                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 383                 return ret;
 384         }
 385
 386         return ret;
 387 }