source/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 const uint8 *auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state)
  31 {
  32         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  33                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  34         return auth_ntlmssp_state->auth_context->get_ntlm_challenge(auth_ntlmssp_state->auth_context);
  35 }
  36
  37 /**
  38  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  39  *
  40  * @return If the effective challenge used by the auth subsystem may be modified
  41  */
  42 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  43 {
  44         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  45                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  46         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  47
  48         return auth_context->challenge_may_be_modified;
  49 }
  50
  51 /**
  52  * NTLM2 authentication modifies the effective challenge,
  53  * @param challenge The new challenge value
  54  */
  55 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  56 {
  57         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  58                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  59         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  60
  61         SMB_ASSERT(challenge->length == 8);
  62
  63         auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
  64                                                    challenge->data, challenge->length);
  65
  66         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
  67
  68         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  69         DEBUG(5, ("challenge is: \n"));
  70         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
  71         return NT_STATUS_OK;
  72 }
  73
  74 /**
  75  * Check the password on an NTLMSSP login.
  76  *
  77  * Return the session keys used on the connection.
  78  */
  79
  80 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
  81 {
  82         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  83                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->auth_context;
  84         auth_usersupplied_info *user_info = NULL;
  85         NTSTATUS nt_status;
  86         bool username_was_mapped;
  87
  88         /* the client has given us its machine name (which we otherwise would not get on port 445).
  89            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  90
  91         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->workstation, True);
  92
  93         /* setup the string used by %U */
  94         /* sub_set_smb_name checks for weird internally */
  95         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
  96
  97         reload_services(True);
  98
  99         nt_status = make_user_info_map(&user_info,
 100                                        auth_ntlmssp_state->ntlmssp_state->user,
 101                                        auth_ntlmssp_state->ntlmssp_state->domain,
 102                                        auth_ntlmssp_state->ntlmssp_state->workstation,
 103                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 104                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 105                                        NULL, NULL, NULL,
 106                                        True);
 107
 108         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 109
 110         if (!NT_STATUS_IS_OK(nt_status)) {
 111                 return nt_status;
 112         }
 113
 114         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 115                                                                           user_info, &auth_ntlmssp_state->server_info);
 116
 117         username_was_mapped = user_info->was_mapped;
 118
 119         free_user_info(&user_info);
 120
 121         if (!NT_STATUS_IS_OK(nt_status)) {
 122                 return nt_status;
 123         }
 124
 125         auth_ntlmssp_state->server_info->nss_token |= username_was_mapped;
 126
 127         nt_status = create_local_token(auth_ntlmssp_state->server_info);
 128
 129         if (!NT_STATUS_IS_OK(nt_status)) {
 130                 DEBUG(10, ("create_local_token failed: %s\n",
 131                         nt_errstr(nt_status)));
 132                 return nt_status;
 133         }
 134
 135         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 136                 DEBUG(10, ("Got NT session key of length %u\n",
 137                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 138                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 139                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 140                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 141         }
 142         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 143                 DEBUG(10, ("Got LM session key of length %u\n",
 144                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 145                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 146                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 147                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 148         }
 149         return nt_status;
 150 }
 151
 152 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 153 {
 154         NTSTATUS nt_status;
 155         TALLOC_CTX *mem_ctx;
 156
 157         mem_ctx = talloc_init("AUTH NTLMSSP context");
 158
 159         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 160         if (!*auth_ntlmssp_state) {
 161                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 162                 talloc_destroy(mem_ctx);
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165
 166         ZERO_STRUCTP(*auth_ntlmssp_state);
 167
 168         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 169
 170         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 171                 return nt_status;
 172         }
 173
 174         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 175                 return nt_status;
 176         }
 177
 178         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 179         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 180         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 181         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 182         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 183         (*auth_ntlmssp_state)->ntlmssp_state->server_role = (enum server_types)lp_server_role();
 184
 185         return NT_STATUS_OK;
 186 }
 187
 188 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 189 {
 190         TALLOC_CTX *mem_ctx;
 191
 192         if (*auth_ntlmssp_state == NULL) {
 193                 return;
 194         }
 195
 196         mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 197         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 198                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 199         }
 200         if ((*auth_ntlmssp_state)->auth_context) {
 201                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 202         }
 203         if ((*auth_ntlmssp_state)->server_info) {
 204                 TALLOC_FREE((*auth_ntlmssp_state)->server_info);
 205         }
 206         talloc_destroy(mem_ctx);
 207         *auth_ntlmssp_state = NULL;
 208 }
 209
 210 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 211                              const DATA_BLOB request, DATA_BLOB *reply)
 212 {
 213         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 214 }