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