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 "librpc/gen_ndr/ndr_netlogon.h"
  24 #include "system/time.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "../lib/util/util_ldb.h"
  27 #include "auth/auth.h"
  28 #include "../libcli/auth/ntlm_check.h"
  29 #include "auth/ntlm/auth_proto.h"
  30 #include "auth/auth_sam.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "libcli/security/security.h"
  33 #include "libcli/ldap/ldap_ndr.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_msgs)
  47 {
  48         struct ldb_message **msgs;
  49
  50         int ret;
  51
  52         /* pull the user attributes */
  53         ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
  54                            "(&(sAMAccountName=%s)(objectclass=user))",
  55                            ldb_binary_encode_string(mem_ctx, account_name));
  56         if (ret == -1) {
  57                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  58         }
  59
  60         if (ret == 0) {
  61                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  62                          account_name, ldb_dn_get_linearized(domain_dn)));
  63                 return NT_STATUS_NO_SUCH_USER;
  64         }
  65
  66         if (ret > 1) {
  67                 DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
  68                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  69         }
  70
  71         *ret_msgs = msgs;
  72
  73         return NT_STATUS_OK;
  74 }
  75
  76 /****************************************************************************
  77  Do a specific test for an smb password being correct, given a smb_password and
  78  the lanman and NT responses.
  79 ****************************************************************************/
  80 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
  81                                     TALLOC_CTX *mem_ctx,
  82                                     uint16_t acct_flags,
  83                                     const struct samr_Password *lm_pwd,
  84                                     const struct samr_Password *nt_pwd,
  85                                     const struct auth_usersupplied_info *user_info,
  86                                     DATA_BLOB *user_sess_key,
  87                                     DATA_BLOB *lm_sess_key)
  88 {
  89         NTSTATUS status;
  90
  91         switch (user_info->password_state) {
  92         case AUTH_PASSWORD_PLAIN:
  93         {
  94                 const struct auth_usersupplied_info *user_info_temp;
  95                 status = encrypt_user_info(mem_ctx, auth_context,
  96                                            AUTH_PASSWORD_HASH,
  97                                            user_info, &user_info_temp);
  98                 if (!NT_STATUS_IS_OK(status)) {
  99                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
 100                         return status;
 101                 }
 102                 user_info = user_info_temp;
 103
 104                 /*fall through*/
 105         }
 106         case AUTH_PASSWORD_HASH:
 107                 *lm_sess_key = data_blob(NULL, 0);
 108                 *user_sess_key = data_blob(NULL, 0);
 109                 status = hash_password_check(mem_ctx,
 110                                              lp_lanman_auth(auth_context->lp_ctx),
 111                                              user_info->password.hash.lanman,
 112                                              user_info->password.hash.nt,
 113                                              user_info->mapped.account_name,
 114                                              lm_pwd, nt_pwd);
 115                 NT_STATUS_NOT_OK_RETURN(status);
 116                 break;
 117
 118         case AUTH_PASSWORD_RESPONSE:
 119                 status = ntlm_password_check(mem_ctx,
 120                                              lp_lanman_auth(auth_context->lp_ctx),
 121                                                  lp_ntlm_auth(auth_context->lp_ctx),
 122                                              user_info->logon_parameters,
 123                                              &auth_context->challenge.data,
 124                                              &user_info->password.response.lanman,
 125                                              &user_info->password.response.nt,
 126                                              user_info->mapped.account_name,
 127                                              user_info->client.account_name,
 128                                              user_info->client.domain_name,
 129                                              lm_pwd, nt_pwd,
 130                                              user_sess_key, lm_sess_key);
 131                 NT_STATUS_NOT_OK_RETURN(status);
 132                 break;
 133         }
 134
 135         if (user_sess_key && user_sess_key->data) {
 136                 talloc_steal(auth_context, user_sess_key->data);
 137         }
 138         if (lm_sess_key && lm_sess_key->data) {
 139                 talloc_steal(auth_context, lm_sess_key->data);
 140         }
 141
 142         return NT_STATUS_OK;
 143 }
 144
 145
 146
 147 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 148                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 149                                      struct ldb_dn *domain_dn,
 150                                      struct ldb_message **msgs,
 151                                      const struct auth_usersupplied_info *user_info,
 152                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 153 {
 154         struct samr_Password *lm_pwd, *nt_pwd;
 155         NTSTATUS nt_status;
 156
 157         uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msgs[0], domain_dn);
 158
 159         /* Quit if the account was locked out. */
 160         if (acct_flags & ACB_AUTOLOCK) {
 161                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 162                          user_info->mapped.account_name));
 163                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 164         }
 165
 166         /* You can only do an interactive login to normal accounts */
 167         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 168                 if (!(acct_flags & ACB_NORMAL)) {
 169                         return NT_STATUS_NO_SUCH_USER;
 170                 }
 171         }
 172
 173         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msgs[0], &lm_pwd, &nt_pwd);
 174         NT_STATUS_NOT_OK_RETURN(nt_status);
 175
 176         nt_status = authsam_password_ok(auth_context, mem_ctx,
 177                                         acct_flags, lm_pwd, nt_pwd,
 178                                         user_info, user_sess_key, lm_sess_key);
 179         NT_STATUS_NOT_OK_RETURN(nt_status);
 180
 181         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 182                                        user_info->logon_parameters,
 183                                        domain_dn,
 184                                        msgs[0],
 185                                        user_info->workstation_name,
 186                                        user_info->mapped.account_name,
 187                                        false);
 188
 189         return nt_status;
 190 }
 191
 192
 193
 194 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 195                                                  TALLOC_CTX *mem_ctx,
 196                                                  const struct auth_usersupplied_info *user_info,
 197                                                  struct auth_serversupplied_info **server_info)
 198 {
 199         NTSTATUS nt_status;
 200         const char *account_name = user_info->mapped.account_name;
 201         struct ldb_message **msgs;
 202         struct ldb_context *sam_ctx;
 203         struct ldb_dn *domain_dn;
 204         DATA_BLOB user_sess_key, lm_sess_key;
 205         TALLOC_CTX *tmp_ctx;
 206
 207         if (!account_name || !*account_name) {
 208                 /* 'not for me' */
 209                 return NT_STATUS_NOT_IMPLEMENTED;
 210         }
 211
 212         tmp_ctx = talloc_new(mem_ctx);
 213         if (!tmp_ctx) {
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216
 217         sam_ctx = samdb_connect(tmp_ctx, ctx->auth_ctx->event_ctx, ctx->auth_ctx->lp_ctx, system_session(mem_ctx, ctx->auth_ctx->lp_ctx));
 218         if (sam_ctx == NULL) {
 219                 talloc_free(tmp_ctx);
 220                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 221         }
 222
 223         domain_dn = ldb_get_default_basedn(sam_ctx);
 224         if (domain_dn == NULL) {
 225                 talloc_free(tmp_ctx);
 226                 return NT_STATUS_NO_SUCH_DOMAIN;
 227         }
 228
 229         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain_dn, &msgs);
 230         if (!NT_STATUS_IS_OK(nt_status)) {
 231                 talloc_free(tmp_ctx);
 232                 return nt_status;
 233         }
 234
 235         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, domain_dn, msgs, user_info,
 236                                          &user_sess_key, &lm_sess_key);
 237         if (!NT_STATUS_IS_OK(nt_status)) {
 238                 talloc_free(tmp_ctx);
 239                 return nt_status;
 240         }
 241
 242         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx),
 243                                              lp_sam_name(ctx->auth_ctx->lp_ctx),
 244                                              domain_dn,
 245                                              msgs[0],
 246                                              user_sess_key, lm_sess_key,
 247                                              server_info);
 248         if (!NT_STATUS_IS_OK(nt_status)) {
 249                 talloc_free(tmp_ctx);
 250                 return nt_status;
 251         }
 252
 253         talloc_steal(mem_ctx, *server_info);
 254         talloc_free(tmp_ctx);
 255
 256         return NT_STATUS_OK;
 257 }
 258
 259 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 260                                                 TALLOC_CTX *mem_ctx,
 261                                                 const struct auth_usersupplied_info *user_info)
 262 {
 263         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 264                 return NT_STATUS_NOT_IMPLEMENTED;
 265         }
 266
 267         return NT_STATUS_OK;
 268 }
 269
 270 /****************************************************************************
 271 Check SAM security (above) but with a few extra checks.
 272 ****************************************************************************/
 273 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 274                                    TALLOC_CTX *mem_ctx,
 275                                    const struct auth_usersupplied_info *user_info)
 276 {
 277         bool is_local_name, is_my_domain;
 278
 279         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 280                 return NT_STATUS_NOT_IMPLEMENTED;
 281         }
 282
 283         is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx,
 284                                   user_info->mapped.domain_name);
 285         is_my_domain  = lp_is_mydomain(ctx->auth_ctx->lp_ctx,
 286                                        user_info->mapped.domain_name);
 287
 288         /* check whether or not we service this domain/workgroup name */
 289         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 290                 case ROLE_STANDALONE:
 291                         return NT_STATUS_OK;
 292
 293                 case ROLE_DOMAIN_MEMBER:
 294                         if (!is_local_name) {
 295                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 296                                         user_info->mapped.domain_name));
 297                                 return NT_STATUS_NOT_IMPLEMENTED;
 298                         }
 299                         return NT_STATUS_OK;
 300
 301                 case ROLE_DOMAIN_CONTROLLER:
 302                         if (!is_local_name && !is_my_domain) {
 303                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 304                                         user_info->mapped.domain_name));
 305                                 return NT_STATUS_NOT_IMPLEMENTED;
 306                         }
 307                         return NT_STATUS_OK;
 308         }
 309
 310         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 311         return NT_STATUS_NOT_IMPLEMENTED;
 312 }
 313
 314
 315 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 316 NTSTATUS authsam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 317                                            struct auth_context *auth_context,
 318                                            const char *principal,
 319                                            struct auth_serversupplied_info **server_info)
 320 {
 321         NTSTATUS nt_status;
 322         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 323         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 324
 325         struct ldb_message **msgs;
 326         struct ldb_context *sam_ctx;
 327         struct ldb_dn *domain_dn;
 328
 329         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 330         if (!tmp_ctx) {
 331                 return NT_STATUS_NO_MEMORY;
 332         }
 333
 334         sam_ctx = samdb_connect(tmp_ctx, auth_context->event_ctx, auth_context->lp_ctx,
 335                                 system_session(tmp_ctx, auth_context->lp_ctx));
 336         if (sam_ctx == NULL) {
 337                 talloc_free(tmp_ctx);
 338                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 339         }
 340
 341         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 342                                               &domain_dn, &msgs);
 343         if (!NT_STATUS_IS_OK(nt_status)) {
 344                 return nt_status;
 345         }
 346
 347         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 348                                              lp_netbios_name(auth_context->lp_ctx),
 349                                              lp_workgroup(auth_context->lp_ctx),
 350                                              domain_dn,
 351                                              msgs[0],
 352                                              user_sess_key, lm_sess_key,
 353                                              server_info);
 354         if (NT_STATUS_IS_OK(nt_status)) {
 355                 talloc_steal(mem_ctx, *server_info);
 356         }
 357         talloc_free(tmp_ctx);
 358         return nt_status;
 359 }
 360
 361 static const struct auth_operations sam_ignoredomain_ops = {
 362         .name                      = "sam_ignoredomain",
 363         .get_challenge             = auth_get_challenge_not_implemented,
 364         .want_check                = authsam_ignoredomain_want_check,
 365         .check_password            = authsam_check_password_internals,
 366         .get_server_info_principal = authsam_get_server_info_principal
 367 };
 368
 369 static const struct auth_operations sam_ops = {
 370         .name                      = "sam",
 371         .get_challenge             = auth_get_challenge_not_implemented,
 372         .want_check                = authsam_want_check,
 373         .check_password            = authsam_check_password_internals,
 374         .get_server_info_principal = authsam_get_server_info_principal
 375 };
 376
 377 _PUBLIC_ NTSTATUS auth_sam_init(void)
 378 {
 379         NTSTATUS ret;
 380
 381         ret = auth_register(&sam_ops);
 382         if (!NT_STATUS_IS_OK(ret)) {
 383                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 384                 return ret;
 385         }
 386
 387         ret = auth_register(&sam_ignoredomain_ops);
 388         if (!NT_STATUS_IS_OK(ret)) {
 389                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 390                 return ret;
 391         }
 392
 393         return ret;
 394 }