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 "auth.h"
  25 #include "../libcli/auth/ntlmssp.h"
  26 #include "ntlmssp_wrap.h"
  27 #include "../librpc/gen_ndr/netlogon.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "auth/gensec/gensec.h"
  30
  31 NTSTATUS auth_ntlmssp_steal_session_info(TALLOC_CTX *mem_ctx,
  32                                         struct auth_ntlmssp_state *auth_ntlmssp_state,
  33                                         struct auth_session_info **session_info)
  34 {
  35         NTSTATUS nt_status;
  36         if (auth_ntlmssp_state->gensec_security) {
  37
  38                 nt_status = gensec_session_info(auth_ntlmssp_state->gensec_security,
  39                                                 mem_ctx,
  40                                                 session_info);
  41                 return nt_status;
  42         }
  43
  44         nt_status = create_local_token(mem_ctx,
  45                                        auth_ntlmssp_state->server_info,
  46                                        &auth_ntlmssp_state->ntlmssp_state->session_key,
  47                                        auth_ntlmssp_state->ntlmssp_state->user,
  48                                        session_info);
  49
  50         if (!NT_STATUS_IS_OK(nt_status)) {
  51                 DEBUG(10, ("create_local_token failed: %s\n",
  52                            nt_errstr(nt_status)));
  53         }
  54         return nt_status;
  55 }
  56
  57 /**
  58  * Return the challenge as determined by the authentication subsystem
  59  * @return an 8 byte random challenge
  60  */
  61
  62 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  63                                            uint8_t chal[8])
  64 {
  65         struct auth_ntlmssp_state *auth_ntlmssp_state =
  66                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  67         auth_ntlmssp_state->auth_context->get_ntlm_challenge(
  68                 auth_ntlmssp_state->auth_context, chal);
  69         return NT_STATUS_OK;
  70 }
  71
  72 /**
  73  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  74  *
  75  * @return If the effective challenge used by the auth subsystem may be modified
  76  */
  77 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  78 {
  79         struct auth_ntlmssp_state *auth_ntlmssp_state =
  80                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  81         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  82
  83         return auth_context->challenge_may_be_modified;
  84 }
  85
  86 /**
  87  * NTLM2 authentication modifies the effective challenge,
  88  * @param challenge The new challenge value
  89  */
  90 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  91 {
  92         struct auth_ntlmssp_state *auth_ntlmssp_state =
  93                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  94         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  95
  96         SMB_ASSERT(challenge->length == 8);
  97
  98         auth_context->challenge = data_blob_talloc(auth_context,
  99                                                    challenge->data, challenge->length);
 100
 101         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
 102
 103         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 104         DEBUG(5, ("challenge is: \n"));
 105         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 106         return NT_STATUS_OK;
 107 }
 108
 109 /**
 110  * Check the password on an NTLMSSP login.
 111  *
 112  * Return the session keys used on the connection.
 113  */
 114
 115 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, TALLOC_CTX *mem_ctx,
 116                                             DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 117 {
 118         struct auth_ntlmssp_state *auth_ntlmssp_state =
 119                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
 120         struct auth_usersupplied_info *user_info = NULL;
 121         NTSTATUS nt_status;
 122         bool username_was_mapped;
 123
 124         /* the client has given us its machine name (which we otherwise would not get on port 445).
 125            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
 126
 127         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->client.netbios_name, True);
 128
 129         /* setup the string used by %U */
 130         /* sub_set_smb_name checks for weird internally */
 131         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
 132
 133         lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
 134
 135         nt_status = make_user_info_map(&user_info,
 136                                        auth_ntlmssp_state->ntlmssp_state->user,
 137                                        auth_ntlmssp_state->ntlmssp_state->domain,
 138                                        auth_ntlmssp_state->ntlmssp_state->client.netbios_name,
 139                                        auth_ntlmssp_state->remote_address,
 140                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 141                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 142                                        NULL, NULL, NULL,
 143                                        AUTH_PASSWORD_RESPONSE);
 144
 145         if (!NT_STATUS_IS_OK(nt_status)) {
 146                 return nt_status;
 147         }
 148
 149         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 150
 151         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 152                                                                           user_info, &auth_ntlmssp_state->server_info);
 153
 154         username_was_mapped = user_info->was_mapped;
 155
 156         free_user_info(&user_info);
 157
 158         if (!NT_STATUS_IS_OK(nt_status)) {
 159                 nt_status = do_map_to_guest_server_info(nt_status,
 160                                                         &auth_ntlmssp_state->server_info,
 161                                                         auth_ntlmssp_state->ntlmssp_state->user,
 162                                                         auth_ntlmssp_state->ntlmssp_state->domain);
 163                 return nt_status;
 164         }
 165
 166         auth_ntlmssp_state->server_info->nss_token |= username_was_mapped;
 167
 168         /* Clear out the session keys, and pass them to the caller.
 169          * They will not be used in this form again - instead the
 170          * NTLMSSP code will decide on the final correct session key,
 171          * and put it back here at the end of
 172          * auth_ntlmssp_steal_server_info */
 173         if (auth_ntlmssp_state->server_info->session_key.length) {
 174                 DEBUG(10, ("Got NT session key of length %u\n",
 175                         (unsigned int)auth_ntlmssp_state->server_info->session_key.length));
 176                 *session_key = auth_ntlmssp_state->server_info->session_key;
 177                 talloc_steal(mem_ctx, auth_ntlmssp_state->server_info->session_key.data);
 178                 auth_ntlmssp_state->server_info->session_key = data_blob_null;
 179         }
 180         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 181                 DEBUG(10, ("Got LM session key of length %u\n",
 182                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 183                 *lm_session_key = auth_ntlmssp_state->server_info->lm_session_key;
 184                 talloc_steal(mem_ctx, auth_ntlmssp_state->server_info->lm_session_key.data);
 185                 auth_ntlmssp_state->server_info->lm_session_key = data_blob_null;
 186         }
 187         return nt_status;
 188 }
 189
 190 static int auth_ntlmssp_state_destructor(void *ptr);
 191
 192 NTSTATUS auth_ntlmssp_prepare(const struct tsocket_address *remote_address,
 193                               struct auth_ntlmssp_state **auth_ntlmssp_state)
 194 {
 195         NTSTATUS nt_status;
 196         bool is_standalone;
 197         const char *netbios_name;
 198         const char *netbios_domain;
 199         const char *dns_name;
 200         char *dns_domain;
 201         struct auth_ntlmssp_state *ans;
 202         struct auth_context *auth_context;
 203
 204         ans = talloc_zero(NULL, struct auth_ntlmssp_state);
 205         if (!ans) {
 206                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 207                 return NT_STATUS_NO_MEMORY;
 208         }
 209
 210         nt_status = make_auth_context_subsystem(talloc_tos(), &auth_context);
 211         if (!NT_STATUS_IS_OK(nt_status)) {
 212                 TALLOC_FREE(ans);
 213                 return nt_status;
 214         }
 215
 216         ans->auth_context = talloc_steal(ans, auth_context);
 217
 218         if (auth_context->prepare_gensec) {
 219                 nt_status = auth_context->prepare_gensec(ans, &ans->gensec_security);
 220                 if (!NT_STATUS_IS_OK(nt_status)) {
 221                         TALLOC_FREE(ans);
 222                         return nt_status;
 223                 } else {
 224                         *auth_ntlmssp_state = ans;
 225                         return NT_STATUS_OK;
 226                 }
 227         }
 228
 229         if ((enum server_role)lp_server_role() == ROLE_STANDALONE) {
 230                 is_standalone = true;
 231         } else {
 232                 is_standalone = false;
 233         }
 234
 235         netbios_name = lp_netbios_name();
 236         netbios_domain = lp_workgroup();
 237         /* This should be a 'netbios domain -> DNS domain' mapping */
 238         dns_domain = get_mydnsdomname(talloc_tos());
 239         if (dns_domain) {
 240                 strlower_m(dns_domain);
 241         }
 242         dns_name = get_mydnsfullname();
 243
 244         ans->remote_address = tsocket_address_copy(remote_address, ans);
 245         if (ans->remote_address == NULL) {
 246                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 247                 return NT_STATUS_NO_MEMORY;
 248         }
 249
 250         nt_status = ntlmssp_server_start(ans,
 251                                          is_standalone,
 252                                          netbios_name,
 253                                          netbios_domain,
 254                                          dns_name,
 255                                          dns_domain,
 256                                          &ans->ntlmssp_state);
 257         if (!NT_STATUS_IS_OK(nt_status)) {
 258                 return nt_status;
 259         }
 260
 261         ans->ntlmssp_state->callback_private = ans;
 262         ans->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 263         ans->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 264         ans->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 265         ans->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 266
 267         talloc_set_destructor((TALLOC_CTX *)ans, auth_ntlmssp_state_destructor);
 268
 269         *auth_ntlmssp_state = ans;
 270         return NT_STATUS_OK;
 271 }
 272
 273 static int auth_ntlmssp_state_destructor(void *ptr)
 274 {
 275         struct auth_ntlmssp_state *ans;
 276
 277         ans = talloc_get_type(ptr, struct auth_ntlmssp_state);
 278
 279         TALLOC_FREE(ans->remote_address);
 280         TALLOC_FREE(ans->server_info);
 281         TALLOC_FREE(ans->ntlmssp_state);
 282         return 0;
 283 }
 284
 285 NTSTATUS auth_ntlmssp_start(struct auth_ntlmssp_state *auth_ntlmssp_state)
 286 {
 287         if (auth_ntlmssp_state->auth_context->gensec_start_mech_by_oid) {
 288                 return auth_ntlmssp_state->auth_context->gensec_start_mech_by_oid(auth_ntlmssp_state->gensec_security, GENSEC_OID_NTLMSSP);
 289         }
 290
 291         return NT_STATUS_OK;
 292 }