source3/auth/auth_ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2005,2011
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "libcli/security/security.h"
  27 #include "lib/util/tevent_ntstatus.h"
  28
  29 NTSTATUS auth3_generate_session_info(struct auth4_context *auth_context,
  30                                      TALLOC_CTX *mem_ctx,
  31                                      void *server_returned_info,
  32                                      const char *original_user_name,
  33                                      uint32_t session_info_flags,
  34                                      struct auth_session_info **session_info)
  35 {
  36         struct auth_user_info_dc *user_info = NULL;
  37         struct auth_serversupplied_info *server_info = NULL;
  38         NTSTATUS nt_status;
  39
  40         /*
  41          * This is a hack, some callers...
  42          *
  43          * Some callers pass auth_user_info_dc, the SCHANNEL and
  44          * NCALRPC_AS_SYSTEM gensec modules.
  45          *
  46          * While the reset passes auth3_check_password() returned.
  47          */
  48         user_info = talloc_get_type(server_returned_info,
  49                                     struct auth_user_info_dc);
  50         if (user_info != NULL) {
  51                 const struct dom_sid *sid;
  52                 int cmp;
  53
  54                 /*
  55                  * This should only be called from SCHANNEL or NCALRPC_AS_SYSTEM
  56                  */
  57                 if (user_info->num_sids != 1) {
  58                         return NT_STATUS_INTERNAL_ERROR;
  59                 }
  60                 sid = &user_info->sids[PRIMARY_USER_SID_INDEX];
  61
  62                 cmp = dom_sid_compare(sid, &global_sid_System);
  63                 if (cmp == 0) {
  64                         return make_session_info_system(mem_ctx, session_info);
  65                 }
  66
  67                 cmp = dom_sid_compare(sid, &global_sid_Anonymous);
  68                 if (cmp == 0) {
  69                         return make_session_info_anonymous(mem_ctx, session_info);
  70                 }
  71
  72                 return NT_STATUS_INTERNAL_ERROR;
  73         }
  74
  75         server_info = talloc_get_type_abort(server_returned_info,
  76                                             struct auth_serversupplied_info);
  77         nt_status = create_local_token(mem_ctx,
  78                                        server_info,
  79                                        NULL,
  80                                        original_user_name,
  81                                        session_info);
  82         if (!NT_STATUS_IS_OK(nt_status)) {
  83                 DEBUG(10, ("create_local_token failed: %s\n",
  84                            nt_errstr(nt_status)));
  85                 return nt_status;
  86         }
  87
  88         return NT_STATUS_OK;
  89 }
  90
  91 /**
  92  * Return the challenge as determined by the authentication subsystem
  93  * @return an 8 byte random challenge
  94  */
  95
  96 NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
  97                                            uint8_t chal[8])
  98 {
  99         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 100                                                                   struct auth_context);
 101         auth_get_ntlm_challenge(auth_context, chal);
 102         return NT_STATUS_OK;
 103 }
 104
 105 /**
 106  * NTLM2 authentication modifies the effective challenge,
 107  * @param challenge The new challenge value
 108  */
 109 NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
 110                              const char *challenge_set_by)
 111 {
 112         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 113                                                                   struct auth_context);
 114
 115         auth_context->challenge = data_blob_talloc(auth_context,
 116                                                    chal, 8);
 117         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge.data);
 118
 119         auth_context->challenge_set_by = talloc_strdup(auth_context, challenge_set_by);
 120         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge_set_by);
 121
 122         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 123         DEBUG(5, ("challenge is: \n"));
 124         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 125         return NT_STATUS_OK;
 126 }
 127
 128 /**
 129  * Check the password on an NTLMSSP login.
 130  *
 131  * Return the session keys used on the connection.
 132  */
 133
 134 struct auth3_check_password_state {
 135         uint8_t authoritative;
 136         void *server_info;
 137         DATA_BLOB nt_session_key;
 138         DATA_BLOB lm_session_key;
 139 };
 140
 141 struct tevent_req *auth3_check_password_send(
 142         TALLOC_CTX *mem_ctx,
 143         struct tevent_context *ev,
 144         struct auth4_context *auth4_context,
 145         const struct auth_usersupplied_info *user_info)
 146 {
 147         struct tevent_req *req = NULL;
 148         struct auth3_check_password_state *state = NULL;
 149         struct auth_context *auth_context = talloc_get_type_abort(
 150                 auth4_context->private_data, struct auth_context);
 151         struct auth_usersupplied_info *mapped_user_info = NULL;
 152         struct auth_serversupplied_info *server_info = NULL;
 153         char *sanitized_username = NULL;
 154         NTSTATUS nt_status;
 155         bool username_was_mapped;
 156
 157         req = tevent_req_create(
 158                 mem_ctx, &state, struct auth3_check_password_state);
 159         if (req == NULL) {
 160                 return NULL;
 161         }
 162
 163         /*
 164          * Be authoritative by default.
 165          */
 166         state->authoritative = 1;
 167
 168         /* The client has given us its machine name (which we only get over NBT transport).
 169            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 170
 171         set_remote_machine_name(user_info->workstation_name, True);
 172
 173         nt_status = make_user_info_map(talloc_tos(),
 174                                        &mapped_user_info,
 175                                        user_info->client.account_name,
 176                                        user_info->client.domain_name,
 177                                        user_info->workstation_name,
 178                                        user_info->remote_host,
 179                                        user_info->local_host,
 180                                        user_info->service_description,
 181                                        user_info->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
 182                                        user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
 183                                        NULL, NULL, NULL,
 184                                        AUTH_PASSWORD_RESPONSE);
 185
 186         if (tevent_req_nterror(req, nt_status)) {
 187                 return tevent_req_post(req, ev);
 188         }
 189
 190         mapped_user_info->logon_parameters = user_info->logon_parameters;
 191
 192         mapped_user_info->flags = user_info->flags;
 193
 194         sanitized_username = talloc_alpha_strcpy(
 195                 state,
 196                 user_info->client.account_name,
 197                 SAFE_NETBIOS_CHARS "$");
 198         if (sanitized_username == NULL) {
 199                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 200                 return tevent_req_post(req, ev);
 201         }
 202
 203         nt_status = auth_check_ntlm_password(state,
 204                                              auth_context,
 205                                              mapped_user_info,
 206                                              &server_info,
 207                                              &state->authoritative);
 208
 209         if (!NT_STATUS_IS_OK(nt_status)) {
 210                 DBG_INFO("Checking NTLMSSP password for %s\\%s failed: "
 211                          "%s, authoritative=%"PRIu8"\n",
 212                          user_info->client.domain_name,
 213                          user_info->client.account_name,
 214                          nt_errstr(nt_status),
 215                          state->authoritative);
 216         }
 217
 218         username_was_mapped = mapped_user_info->was_mapped;
 219
 220         TALLOC_FREE(mapped_user_info);
 221
 222         if (!NT_STATUS_IS_OK(nt_status)) {
 223                 nt_status = do_map_to_guest_server_info(
 224                         state,
 225                         nt_status,
 226                         user_info->client.account_name,
 227                         user_info->client.domain_name,
 228                         &server_info);
 229                 if (!tevent_req_nterror(req, nt_status)) {
 230                         state->authoritative = 1;
 231
 232                         /* setup the string used by %U */
 233                         set_current_user_info(
 234                                 sanitized_username,
 235                                 server_info->unix_name,
 236                                 server_info->info3->base.logon_domain.string);
 237
 238                         lp_load_with_shares(get_dyn_CONFIGFILE());
 239
 240                         tevent_req_done(req);
 241                 }
 242                 state->server_info = server_info;
 243                 return tevent_req_post(req, ev);
 244         }
 245
 246         server_info->nss_token |= username_was_mapped;
 247
 248         /* setup the string used by %U */
 249         set_current_user_info(sanitized_username,
 250                               server_info->unix_name,
 251                               server_info->info3->base.logon_domain.string);
 252
 253         lp_load_with_shares(get_dyn_CONFIGFILE());
 254
 255         /* Clear out the session keys, and pass them to the caller.
 256          * They will not be used in this form again - instead the
 257          * NTLMSSP code will decide on the final correct session key,
 258          * and supply it to create_local_token() */
 259
 260         DBG_DEBUG("Got NT session key of length %zu\n",
 261                   server_info->session_key.length);
 262         state->nt_session_key = (DATA_BLOB) {
 263                 .data = talloc_move(
 264                         state, &server_info->session_key.data),
 265                 .length = server_info->session_key.length,
 266         };
 267         server_info->session_key = data_blob_null;
 268
 269         DBG_DEBUG("Got LM session key of length %zu\n",
 270                   server_info->lm_session_key.length);
 271         state->lm_session_key = (DATA_BLOB) {
 272                 .data = talloc_move(
 273                         state, &server_info->lm_session_key.data),
 274                 .length = server_info->lm_session_key.length,
 275         };
 276         server_info->lm_session_key = data_blob_null;
 277
 278         state->server_info = server_info;
 279
 280         tevent_req_done(req);
 281         return tevent_req_post(req, ev);
 282 }
 283
 284 NTSTATUS auth3_check_password_recv(struct tevent_req *req,
 285                                    TALLOC_CTX *mem_ctx,
 286                                    uint8_t *pauthoritative,
 287                                    void **server_returned_info,
 288                                    DATA_BLOB *nt_session_key,
 289                                    DATA_BLOB *lm_session_key)
 290 {
 291         struct auth3_check_password_state *state = tevent_req_data(
 292                 req, struct auth3_check_password_state);
 293         NTSTATUS status;
 294
 295         if (pauthoritative != NULL) {
 296                 *pauthoritative = state->authoritative;
 297         }
 298
 299         if (tevent_req_is_nterror(req, &status)) {
 300                 return status;
 301         }
 302
 303         if (server_returned_info != NULL) {
 304                 *server_returned_info = talloc_move(
 305                         mem_ctx, &state->server_info);
 306         }
 307         if (nt_session_key != NULL) {
 308                 *nt_session_key = (DATA_BLOB) {
 309                         .data = talloc_move(
 310                                 mem_ctx, &state->nt_session_key.data),
 311                         .length = state->nt_session_key.length,
 312                 };
 313         }
 314         if (lm_session_key != NULL) {
 315                 *lm_session_key = (DATA_BLOB) {
 316                         .data = talloc_move(
 317                                 mem_ctx, &state->lm_session_key.data),
 318                         .length = state->lm_session_key.length,
 319                 };
 320         }
 321
 322         return NT_STATUS_OK;
 323 }