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 #include "ntlmssp.h"
  25
  26 /**
  27  * Return the challenge as determined by the authentication subsystem
  28  * @return an 8 byte random challenge
  29  */
  30
  31 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  32                                            uint8_t chal[8])
  33 {
  34         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  35                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->callback_private;
  36         auth_ntlmssp_state->auth_context->get_ntlm_challenge(
  37                 auth_ntlmssp_state->auth_context, chal);
  38         return NT_STATUS_OK;
  39 }
  40
  41 /**
  42  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  43  *
  44  * @return If the effective challenge used by the auth subsystem may be modified
  45  */
  46 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  47 {
  48         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  49                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->callback_private;
  50         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  51
  52         return auth_context->challenge_may_be_modified;
  53 }
  54
  55 /**
  56  * NTLM2 authentication modifies the effective challenge,
  57  * @param challenge The new challenge value
  58  */
  59 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  60 {
  61         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  62                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->callback_private;
  63         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  64
  65         SMB_ASSERT(challenge->length == 8);
  66
  67         auth_context->challenge = data_blob_talloc(auth_context,
  68                                                    challenge->data, challenge->length);
  69
  70         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
  71
  72         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  73         DEBUG(5, ("challenge is: \n"));
  74         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
  75         return NT_STATUS_OK;
  76 }
  77
  78 /**
  79  * Check the password on an NTLMSSP login.
  80  *
  81  * Return the session keys used on the connection.
  82  */
  83
  84 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
  85 {
  86         AUTH_NTLMSSP_STATE *auth_ntlmssp_state =
  87                 (AUTH_NTLMSSP_STATE *)ntlmssp_state->callback_private;
  88         struct auth_usersupplied_info *user_info = NULL;
  89         NTSTATUS nt_status;
  90         bool username_was_mapped;
  91
  92         /* the client has given us its machine name (which we otherwise would not get on port 445).
  93            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  94
  95         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->client.netbios_name, True);
  96
  97         /* setup the string used by %U */
  98         /* sub_set_smb_name checks for weird internally */
  99         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
 100
 101         reload_services(True);
 102
 103         nt_status = make_user_info_map(&user_info,
 104                                        auth_ntlmssp_state->ntlmssp_state->user,
 105                                        auth_ntlmssp_state->ntlmssp_state->domain,
 106                                        auth_ntlmssp_state->ntlmssp_state->client.netbios_name,
 107                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 108                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 109                                        NULL, NULL, NULL,
 110                                        True);
 111
 112         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 113
 114         if (!NT_STATUS_IS_OK(nt_status)) {
 115                 return nt_status;
 116         }
 117
 118         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 119                                                                           user_info, &auth_ntlmssp_state->server_info);
 120
 121         username_was_mapped = user_info->was_mapped;
 122
 123         free_user_info(&user_info);
 124
 125         if (!NT_STATUS_IS_OK(nt_status)) {
 126                 return nt_status;
 127         }
 128
 129         auth_ntlmssp_state->server_info->nss_token |= username_was_mapped;
 130
 131         nt_status = create_local_token(auth_ntlmssp_state->server_info);
 132
 133         if (!NT_STATUS_IS_OK(nt_status)) {
 134                 DEBUG(10, ("create_local_token failed: %s\n",
 135                         nt_errstr(nt_status)));
 136                 return nt_status;
 137         }
 138
 139         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 140                 DEBUG(10, ("Got NT session key of length %u\n",
 141                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 142                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 143                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 144                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 145         }
 146         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 147                 DEBUG(10, ("Got LM session key of length %u\n",
 148                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 149                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 150                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 151                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 152         }
 153         return nt_status;
 154 }
 155
 156 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 157 {
 158         NTSTATUS nt_status;
 159         TALLOC_CTX *mem_ctx;
 160         bool is_standalone;
 161         const char *netbios_name;
 162         const char *netbios_domain;
 163         const char *dns_name;
 164         char *dns_domain;
 165
 166         if ((enum server_types)lp_server_role() == ROLE_STANDALONE) {
 167                 is_standalone = true;
 168         } else {
 169                 is_standalone = false;
 170         }
 171
 172         netbios_name = global_myname();
 173         netbios_domain = lp_workgroup();
 174         /* This should be a 'netbios domain -> DNS domain' mapping */
 175         dns_domain = get_mydnsdomname(talloc_tos());
 176         if (dns_domain) {
 177                 strlower_m(dns_domain);
 178         }
 179         dns_name = get_mydnsfullname();
 180
 181         mem_ctx = talloc_init("AUTH NTLMSSP context");
 182
 183         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 184         if (!*auth_ntlmssp_state) {
 185                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 186                 talloc_destroy(mem_ctx);
 187                 return NT_STATUS_NO_MEMORY;
 188         }
 189
 190         ZERO_STRUCTP(*auth_ntlmssp_state);
 191
 192         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 193
 194         nt_status = ntlmssp_server_start(NULL,
 195                                          is_standalone,
 196                                          netbios_name,
 197                                          netbios_domain,
 198                                          dns_name,
 199                                          dns_domain,
 200                                          &(*auth_ntlmssp_state)->ntlmssp_state);
 201         if (!NT_STATUS_IS_OK(nt_status)) {
 202                 return nt_status;
 203         }
 204
 205         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 206                 return nt_status;
 207         }
 208
 209         (*auth_ntlmssp_state)->ntlmssp_state->callback_private = (*auth_ntlmssp_state);
 210         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 211         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 212         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 213         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 214
 215         return NT_STATUS_OK;
 216 }
 217
 218 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 219 {
 220         TALLOC_CTX *mem_ctx;
 221
 222         if (*auth_ntlmssp_state == NULL) {
 223                 return;
 224         }
 225
 226         mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 227         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 228                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 229         }
 230         if ((*auth_ntlmssp_state)->auth_context) {
 231                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 232         }
 233         if ((*auth_ntlmssp_state)->server_info) {
 234                 TALLOC_FREE((*auth_ntlmssp_state)->server_info);
 235         }
 236         talloc_destroy(mem_ctx);
 237         *auth_ntlmssp_state = NULL;
 238 }
 239
 240 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 241                              const DATA_BLOB request, DATA_BLOB *reply)
 242 {
 243         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 244 }