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 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->was_mapped |= 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\n"));
 131                 return nt_status;
 132         }
 133
 134         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 135                 DEBUG(10, ("Got NT session key of length %u\n",
 136                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 137                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 138                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 139                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 140         }
 141         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 142                 DEBUG(10, ("Got LM session key of length %u\n",
 143                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 144                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 145                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 146                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 147         }
 148         return nt_status;
 149 }
 150
 151 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 152 {
 153         NTSTATUS nt_status;
 154         TALLOC_CTX *mem_ctx;
 155
 156         mem_ctx = talloc_init("AUTH NTLMSSP context");
 157
 158         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 159         if (!*auth_ntlmssp_state) {
 160                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 161                 talloc_destroy(mem_ctx);
 162                 return NT_STATUS_NO_MEMORY;
 163         }
 164
 165         ZERO_STRUCTP(*auth_ntlmssp_state);
 166
 167         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 168
 169         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 170                 return nt_status;
 171         }
 172
 173         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 174                 return nt_status;
 175         }
 176
 177         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 178         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 179         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 180         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 181         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 182         (*auth_ntlmssp_state)->ntlmssp_state->server_role = (enum server_types)lp_server_role();
 183
 184         return NT_STATUS_OK;
 185 }
 186
 187 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 188 {
 189         TALLOC_CTX *mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 190
 191         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 192                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 193         }
 194         if ((*auth_ntlmssp_state)->auth_context) {
 195                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 196         }
 197         if ((*auth_ntlmssp_state)->server_info) {
 198                 TALLOC_FREE((*auth_ntlmssp_state)->server_info);
 199         }
 200         talloc_destroy(mem_ctx);
 201         *auth_ntlmssp_state = NULL;
 202 }
 203
 204 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 205                              const DATA_BLOB request, DATA_BLOB *reply)
 206 {
 207         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 208 }