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 2001-2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 /**
  26  * Return the challenge as determined by the authentication subsystem
  27  * @return an 8 byte random challenge
  28  */
  29
  30 static void auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  31                                        uint8_t chal[8])
  32 {
  33         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  34                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  35         auth_ntlmssp_state->auth_context->get_ntlm_challenge(
  36                 auth_ntlmssp_state->auth_context, chal);
  37 }
  38
  39 /**
  40  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  41  *
  42  * @return If the effective challenge used by the auth subsystem may be modified
  43  */
  44 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  45 {
  46         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  47                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  48         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  49
  50         return auth_context->challenge_may_be_modified;
  51 }
  52
  53 /**
  54  * NTLM2 authentication modifies the effective challenge,
  55  * @param challenge The new challenge value
  56  */
  57 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  58 {
  59         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  60                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  61         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  62
  63         SMB_ASSERT(challenge->length == 8);
  64
  65         auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
  66                                                    challenge->data, challenge->length);
  67
  68         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
  69
  70         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  71         DEBUG(5, ("challenge is: \n"));
  72         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
  73         return NT_STATUS_OK;
  74 }
  75
  76 /**
  77  * Check the password on an NTLMSSP login.
  78  *
  79  * Return the session keys used on the connection.
  80  */
  81
  82 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
  83 {
  84         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  85                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  86         auth_usersupplied_info *user_info = NULL;
  87         NTSTATUS nt_status;
  88         bool username_was_mapped;
  89
  90         /* the client has given us its machine name (which we otherwise would not get on port 445).
  91            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  92
  93         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->workstation, True);
  94
  95         /* setup the string used by %U */
  96         /* sub_set_smb_name checks for weird internally */
  97         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
  98
  99         reload_services(True);
 100
 101         nt_status = make_user_info_map(&user_info,
 102                                        auth_ntlmssp_state->ntlmssp_state->user,
 103                                        auth_ntlmssp_state->ntlmssp_state->domain,
 104                                        auth_ntlmssp_state->ntlmssp_state->workstation,
 105                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 106                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 107                                        NULL, NULL, NULL,
 108                                        True);
 109
 110         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 111
 112         if (!NT_STATUS_IS_OK(nt_status)) {
 113                 return nt_status;
 114         }
 115
 116         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 117                                                                           user_info, &auth_ntlmssp_state->server_info);
 118
 119         username_was_mapped = user_info->was_mapped;
 120
 121         free_user_info(&user_info);
 122
 123         if (!NT_STATUS_IS_OK(nt_status)) {
 124                 return nt_status;
 125         }
 126
 127         auth_ntlmssp_state->server_info->nss_token |= username_was_mapped;
 128
 129         if (auth_ntlmssp_state->server_info->ptok == NULL) {
 130                 nt_status = create_local_token(auth_ntlmssp_state->server_info);
 131                 if (!NT_STATUS_IS_OK(nt_status)) {
 132                         DEBUG(10, ("create_local_token failed: %s\n",
 133                                    nt_errstr(nt_status)));
 134                         return nt_status;
 135                 }
 136         }
 137
 138         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 139                 DEBUG(10, ("Got NT session key of length %u\n",
 140                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 141                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 142                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 143                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 144         }
 145         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 146                 DEBUG(10, ("Got LM session key of length %u\n",
 147                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 148                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 149                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 150                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 151         }
 152         return nt_status;
 153 }
 154
 155 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 156 {
 157         NTSTATUS nt_status;
 158         TALLOC_CTX *mem_ctx;
 159
 160         mem_ctx = talloc_init("AUTH NTLMSSP context");
 161
 162         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 163         if (!*auth_ntlmssp_state) {
 164                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 165                 talloc_destroy(mem_ctx);
 166                 return NT_STATUS_NO_MEMORY;
 167         }
 168
 169         ZERO_STRUCTP(*auth_ntlmssp_state);
 170
 171         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 172
 173         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 174                 return nt_status;
 175         }
 176
 177         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 178                 return nt_status;
 179         }
 180
 181         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 182         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 183         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 184         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 185         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 186         (*auth_ntlmssp_state)->ntlmssp_state->server_role = (enum server_types)lp_server_role();
 187
 188         return NT_STATUS_OK;
 189 }
 190
 191 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 192 {
 193         TALLOC_CTX *mem_ctx;
 194
 195         if (*auth_ntlmssp_state == NULL) {
 196                 return;
 197         }
 198
 199         mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 200         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 201                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 202         }
 203         if ((*auth_ntlmssp_state)->auth_context) {
 204                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 205         }
 206         if ((*auth_ntlmssp_state)->server_info) {
 207                 TALLOC_FREE((*auth_ntlmssp_state)->server_info);
 208         }
 209         talloc_destroy(mem_ctx);
 210         *auth_ntlmssp_state = NULL;
 211 }
 212
 213 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 214                              const DATA_BLOB request, DATA_BLOB *reply)
 215 {
 216         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 217 }