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 "dsdb/common/util.h"
  32 #include "param/param.h"
  33
  34 extern const char *user_attrs[];
  35 extern const char *domain_ref_attrs[];
  36
  37 /****************************************************************************
  38  Look for the specified user in the sam, return ldb result structures
  39 ****************************************************************************/
  40
  41 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  42                                        const char *account_name,
  43                                        struct ldb_dn *domain_dn,
  44                                        struct ldb_message **ret_msg)
  45 {
  46         int ret;
  47
  48         /* pull the user attributes */
  49         ret = dsdb_search_one(sam_ctx, mem_ctx, ret_msg, domain_dn, LDB_SCOPE_SUBTREE,
  50                               user_attrs,
  51                               DSDB_SEARCH_SHOW_EXTENDED_DN,
  52                               "(&(sAMAccountName=%s)(objectclass=user))",
  53                               ldb_binary_encode_string(mem_ctx, account_name));
  54         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  55                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  56                          account_name, ldb_dn_get_linearized(domain_dn)));
  57                 return NT_STATUS_NO_SUCH_USER;
  58         }
  59         if (ret != LDB_SUCCESS) {
  60                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  61         }
  62
  63         return NT_STATUS_OK;
  64 }
  65
  66 /****************************************************************************
  67  Do a specific test for an smb password being correct, given a smb_password and
  68  the lanman and NT responses.
  69 ****************************************************************************/
  70 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
  71                                     TALLOC_CTX *mem_ctx,
  72                                     uint16_t acct_flags,
  73                                     const struct samr_Password *lm_pwd,
  74                                     const struct samr_Password *nt_pwd,
  75                                     const struct auth_usersupplied_info *user_info,
  76                                     DATA_BLOB *user_sess_key,
  77                                     DATA_BLOB *lm_sess_key)
  78 {
  79         NTSTATUS status;
  80
  81         switch (user_info->password_state) {
  82         case AUTH_PASSWORD_PLAIN:
  83         {
  84                 const struct auth_usersupplied_info *user_info_temp;
  85                 status = encrypt_user_info(mem_ctx, auth_context,
  86                                            AUTH_PASSWORD_HASH,
  87                                            user_info, &user_info_temp);
  88                 if (!NT_STATUS_IS_OK(status)) {
  89                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  90                         return status;
  91                 }
  92                 user_info = user_info_temp;
  93
  94                 /*fall through*/
  95         }
  96         case AUTH_PASSWORD_HASH:
  97                 *lm_sess_key = data_blob(NULL, 0);
  98                 *user_sess_key = data_blob(NULL, 0);
  99                 status = hash_password_check(mem_ctx,
 100                                              lp_lanman_auth(auth_context->lp_ctx),
 101                                              user_info->password.hash.lanman,
 102                                              user_info->password.hash.nt,
 103                                              user_info->mapped.account_name,
 104                                              lm_pwd, nt_pwd);
 105                 NT_STATUS_NOT_OK_RETURN(status);
 106                 break;
 107
 108         case AUTH_PASSWORD_RESPONSE:
 109                 status = ntlm_password_check(mem_ctx,
 110                                              lp_lanman_auth(auth_context->lp_ctx),
 111                                                  lp_ntlm_auth(auth_context->lp_ctx),
 112                                              user_info->logon_parameters,
 113                                              &auth_context->challenge.data,
 114                                              &user_info->password.response.lanman,
 115                                              &user_info->password.response.nt,
 116                                              user_info->mapped.account_name,
 117                                              user_info->client.account_name,
 118                                              user_info->client.domain_name,
 119                                              lm_pwd, nt_pwd,
 120                                              user_sess_key, lm_sess_key);
 121                 NT_STATUS_NOT_OK_RETURN(status);
 122                 break;
 123         }
 124
 125         if (user_sess_key && user_sess_key->data) {
 126                 talloc_steal(auth_context, user_sess_key->data);
 127         }
 128         if (lm_sess_key && lm_sess_key->data) {
 129                 talloc_steal(auth_context, lm_sess_key->data);
 130         }
 131
 132         return NT_STATUS_OK;
 133 }
 134
 135
 136
 137 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 138                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 139                                      struct ldb_dn *domain_dn,
 140                                      struct ldb_message *msg,
 141                                      const struct auth_usersupplied_info *user_info,
 142                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 143 {
 144         struct samr_Password *lm_pwd, *nt_pwd;
 145         NTSTATUS nt_status;
 146
 147         uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 148
 149         /* Quit if the account was locked out. */
 150         if (acct_flags & ACB_AUTOLOCK) {
 151                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 152                          user_info->mapped.account_name));
 153                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 154         }
 155
 156         /* You can only do an interactive login to normal accounts */
 157         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 158                 if (!(acct_flags & ACB_NORMAL)) {
 159                         return NT_STATUS_NO_SUCH_USER;
 160                 }
 161         }
 162
 163         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 164         NT_STATUS_NOT_OK_RETURN(nt_status);
 165
 166         nt_status = authsam_password_ok(auth_context, mem_ctx,
 167                                         acct_flags, lm_pwd, nt_pwd,
 168                                         user_info, user_sess_key, lm_sess_key);
 169         NT_STATUS_NOT_OK_RETURN(nt_status);
 170
 171         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 172                                        user_info->logon_parameters,
 173                                        domain_dn,
 174                                        msg,
 175                                        user_info->workstation_name,
 176                                        user_info->mapped.account_name,
 177                                        false, false);
 178
 179         return nt_status;
 180 }
 181
 182
 183
 184 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 185                                                  TALLOC_CTX *mem_ctx,
 186                                                  const struct auth_usersupplied_info *user_info,
 187                                                  struct auth_serversupplied_info **server_info)
 188 {
 189         NTSTATUS nt_status;
 190         const char *account_name = user_info->mapped.account_name;
 191         struct ldb_message *msg;
 192         struct ldb_context *sam_ctx;
 193         struct ldb_dn *domain_dn;
 194         DATA_BLOB user_sess_key, lm_sess_key;
 195         TALLOC_CTX *tmp_ctx;
 196
 197         if (!account_name || !*account_name) {
 198                 /* 'not for me' */
 199                 return NT_STATUS_NOT_IMPLEMENTED;
 200         }
 201
 202         tmp_ctx = talloc_new(mem_ctx);
 203         if (!tmp_ctx) {
 204                 return NT_STATUS_NO_MEMORY;
 205         }
 206
 207         sam_ctx = samdb_connect(tmp_ctx, ctx->auth_ctx->event_ctx, ctx->auth_ctx->lp_ctx, system_session(ctx->auth_ctx->lp_ctx));
 208         if (sam_ctx == NULL) {
 209                 talloc_free(tmp_ctx);
 210                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 211         }
 212
 213         domain_dn = ldb_get_default_basedn(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, 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, 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, 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 */
 306 NTSTATUS authsam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 307                                            struct auth_context *auth_context,
 308                                            const char *principal,
 309                                            struct auth_serversupplied_info **server_info)
 310 {
 311         NTSTATUS nt_status;
 312         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 313         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 314
 315         struct ldb_message *msg;
 316         struct ldb_context *sam_ctx;
 317         struct ldb_dn *domain_dn;
 318
 319         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 320         if (!tmp_ctx) {
 321                 return NT_STATUS_NO_MEMORY;
 322         }
 323
 324         sam_ctx = samdb_connect(tmp_ctx, auth_context->event_ctx, auth_context->lp_ctx,
 325                                 system_session(auth_context->lp_ctx));
 326         if (sam_ctx == NULL) {
 327                 talloc_free(tmp_ctx);
 328                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 329         }
 330
 331         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 332                                               user_attrs, &domain_dn, &msg);
 333         if (!NT_STATUS_IS_OK(nt_status)) {
 334                 talloc_free(tmp_ctx);
 335                 return nt_status;
 336         }
 337
 338         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 339                                              lp_netbios_name(auth_context->lp_ctx),
 340                                              lp_workgroup(auth_context->lp_ctx),
 341                                              domain_dn,
 342                                              msg,
 343                                              user_sess_key, lm_sess_key,
 344                                              server_info);
 345         if (!NT_STATUS_IS_OK(nt_status)) {
 346                 talloc_free(tmp_ctx);
 347                 return nt_status;
 348         }
 349
 350         talloc_steal(mem_ctx, *server_info);
 351         talloc_free(tmp_ctx);
 352
 353         return NT_STATUS_OK;
 354 }
 355
 356 static const struct auth_operations sam_ignoredomain_ops = {
 357         .name                      = "sam_ignoredomain",
 358         .get_challenge             = auth_get_challenge_not_implemented,
 359         .want_check                = authsam_ignoredomain_want_check,
 360         .check_password            = authsam_check_password_internals,
 361         .get_server_info_principal = authsam_get_server_info_principal
 362 };
 363
 364 static const struct auth_operations sam_ops = {
 365         .name                      = "sam",
 366         .get_challenge             = auth_get_challenge_not_implemented,
 367         .want_check                = authsam_want_check,
 368         .check_password            = authsam_check_password_internals,
 369         .get_server_info_principal = authsam_get_server_info_principal
 370 };
 371
 372 _PUBLIC_ NTSTATUS auth_sam_init(void)
 373 {
 374         NTSTATUS ret;
 375
 376         ret = auth_register(&sam_ops);
 377         if (!NT_STATUS_IS_OK(ret)) {
 378                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 379                 return ret;
 380         }
 381
 382         ret = auth_register(&sam_ignoredomain_ops);
 383         if (!NT_STATUS_IS_OK(ret)) {
 384                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 385                 return ret;
 386         }
 387
 388         return ret;
 389 }