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 2001-2005,2011
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "../auth/ntlmssp/ntlmssp.h"
  27 #include "../auth/ntlmssp/ntlmssp_private.h"
  28 #include "../librpc/gen_ndr/netlogon.h"
  29 #include "../librpc/gen_ndr/dcerpc.h"
  30 #include "../lib/tsocket/tsocket.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "librpc/rpc/dcerpc.h"
  33 #include "lib/param/param.h"
  34
  35 NTSTATUS auth3_generate_session_info(TALLOC_CTX *mem_ctx,
  36                                      struct auth4_context *auth_context,
  37                                      void *server_returned_info,
  38                                      const char *original_user_name,
  39                                      uint32_t session_info_flags,
  40                                      struct auth_session_info **session_info)
  41 {
  42         struct auth_serversupplied_info *server_info = talloc_get_type_abort(server_returned_info,
  43                                                                              struct auth_serversupplied_info);
  44         NTSTATUS nt_status;
  45
  46         nt_status = create_local_token(mem_ctx,
  47                                        server_info,
  48                                        NULL,
  49                                        original_user_name,
  50                                        session_info);
  51         if (!NT_STATUS_IS_OK(nt_status)) {
  52                 DEBUG(10, ("create_local_token failed: %s\n",
  53                            nt_errstr(nt_status)));
  54                 return nt_status;
  55         }
  56
  57         return NT_STATUS_OK;
  58 }
  59
  60 static NTSTATUS gensec_ntlmssp3_server_update(struct gensec_security *gensec_security,
  61                                               TALLOC_CTX *out_mem_ctx,
  62                                               struct tevent_context *ev,
  63                                               const DATA_BLOB request,
  64                                               DATA_BLOB *reply)
  65 {
  66         NTSTATUS status;
  67         struct gensec_ntlmssp_context *gensec_ntlmssp =
  68                 talloc_get_type_abort(gensec_security->private_data,
  69                                       struct gensec_ntlmssp_context);
  70
  71         status = ntlmssp_update(gensec_ntlmssp->ntlmssp_state, request, reply);
  72         if (NT_STATUS_IS_OK(status) ||
  73             NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  74                 talloc_steal(out_mem_ctx, reply->data);
  75         }
  76
  77         return status;
  78 }
  79
  80 /**
  81  * Return the challenge as determined by the authentication subsystem
  82  * @return an 8 byte random challenge
  83  */
  84
  85 NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
  86                                            uint8_t chal[8])
  87 {
  88         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  89                                                                   struct auth_context);
  90         auth_context->get_ntlm_challenge(auth_context, chal);
  91         return NT_STATUS_OK;
  92 }
  93
  94 /**
  95  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  96  *
  97  * @return If the effective challenge used by the auth subsystem may be modified
  98  */
  99 bool auth3_may_set_challenge(struct auth4_context *auth4_context)
 100 {
 101         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 102                                                                   struct auth_context);
 103         return auth_context->challenge_may_be_modified;
 104 }
 105
 106 /**
 107  * NTLM2 authentication modifies the effective challenge,
 108  * @param challenge The new challenge value
 109  */
 110 NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
 111                              const char *challenge_set_by)
 112 {
 113         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 114                                                                   struct auth_context);
 115
 116         auth_context->challenge = data_blob_talloc(auth_context,
 117                                                    chal, 8);
 118         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge.data);
 119
 120         auth_context->challenge_set_by = talloc_strdup(auth_context, challenge_set_by);
 121         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge_set_by);
 122
 123         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 124         DEBUG(5, ("challenge is: \n"));
 125         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 126         return NT_STATUS_OK;
 127 }
 128
 129 /**
 130  * Check the password on an NTLMSSP login.
 131  *
 132  * Return the session keys used on the connection.
 133  */
 134
 135 NTSTATUS auth3_check_password(struct auth4_context *auth4_context,
 136                               TALLOC_CTX *mem_ctx,
 137                               const struct auth_usersupplied_info *user_info,
 138                               void **server_returned_info,
 139                               DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 140 {
 141         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 142                                                                   struct auth_context);
 143         struct auth_usersupplied_info *mapped_user_info = NULL;
 144         struct auth_serversupplied_info *server_info;
 145         NTSTATUS nt_status;
 146         bool username_was_mapped;
 147
 148         /* The client has given us its machine name (which we only get over NBT transport).
 149            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 150
 151         set_remote_machine_name(user_info->workstation_name, True);
 152
 153         /* setup the string used by %U */
 154         /* sub_set_smb_name checks for weird internally */
 155         sub_set_smb_name(user_info->client.account_name);
 156
 157         lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
 158
 159         nt_status = make_user_info_map(&mapped_user_info,
 160                                        user_info->client.account_name,
 161                                        user_info->client.domain_name,
 162                                        user_info->workstation_name,
 163                                        user_info->remote_host,
 164                                        user_info->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
 165                                        user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
 166                                        NULL, NULL, NULL,
 167                                        AUTH_PASSWORD_RESPONSE);
 168
 169         if (!NT_STATUS_IS_OK(nt_status)) {
 170                 return nt_status;
 171         }
 172
 173         mapped_user_info->logon_parameters = user_info->logon_parameters;
 174
 175         mapped_user_info->flags = user_info->flags;
 176
 177         nt_status = auth_context->check_ntlm_password(auth_context,
 178                                                       mapped_user_info, &server_info);
 179
 180         if (!NT_STATUS_IS_OK(nt_status)) {
 181                 DEBUG(5,("Checking NTLMSSP password for %s\\%s failed: %s\n",
 182                          user_info->client.domain_name,
 183                          user_info->client.account_name,
 184                          nt_errstr(nt_status)));
 185         }
 186
 187         username_was_mapped = mapped_user_info->was_mapped;
 188
 189         free_user_info(&mapped_user_info);
 190
 191         if (!NT_STATUS_IS_OK(nt_status)) {
 192                 nt_status = do_map_to_guest_server_info(nt_status,
 193                                                         &server_info,
 194                                                         user_info->client.account_name,
 195                                                         user_info->client.domain_name);
 196                 *server_returned_info = talloc_steal(mem_ctx, server_info);
 197                 return nt_status;
 198         }
 199
 200         server_info->nss_token |= username_was_mapped;
 201
 202         /* Clear out the session keys, and pass them to the caller.
 203          * They will not be used in this form again - instead the
 204          * NTLMSSP code will decide on the final correct session key,
 205          * and supply it to create_local_token() */
 206         if (session_key) {
 207                 DEBUG(10, ("Got NT session key of length %u\n",
 208                         (unsigned int)server_info->session_key.length));
 209                 *session_key = server_info->session_key;
 210                 talloc_steal(mem_ctx, server_info->session_key.data);
 211                 server_info->session_key = data_blob_null;
 212         }
 213         if (lm_session_key) {
 214                 DEBUG(10, ("Got LM session key of length %u\n",
 215                         (unsigned int)server_info->lm_session_key.length));
 216                 *lm_session_key = server_info->lm_session_key;
 217                 talloc_steal(mem_ctx, server_info->lm_session_key.data);
 218                 server_info->lm_session_key = data_blob_null;
 219         }
 220
 221         *server_returned_info = talloc_steal(mem_ctx, server_info);
 222         return nt_status;
 223 }
 224
 225 static NTSTATUS gensec_ntlmssp3_server_start(struct gensec_security *gensec_security)
 226 {
 227         NTSTATUS nt_status;
 228         bool is_standalone;
 229         const char *netbios_name;
 230         const char *netbios_domain;
 231         const char *dns_name;
 232         char *dns_domain;
 233         struct gensec_ntlmssp_context *gensec_ntlmssp;
 234
 235         if ((enum server_role)lp_server_role() == ROLE_STANDALONE) {
 236                 is_standalone = true;
 237         } else {
 238                 is_standalone = false;
 239         }
 240
 241         netbios_name = lp_netbios_name();
 242         netbios_domain = lp_workgroup();
 243         /* This should be a 'netbios domain -> DNS domain' mapping */
 244         dns_domain = get_mydnsdomname(talloc_tos());
 245         if (dns_domain) {
 246                 strlower_m(dns_domain);
 247         }
 248         dns_name = get_mydnsfullname();
 249
 250         nt_status = gensec_ntlmssp_start(gensec_security);
 251         NT_STATUS_NOT_OK_RETURN(nt_status);
 252
 253         gensec_ntlmssp =
 254                 talloc_get_type_abort(gensec_security->private_data,
 255                                       struct gensec_ntlmssp_context);
 256
 257         nt_status = ntlmssp_server_start(gensec_ntlmssp,
 258                                          is_standalone,
 259                                          netbios_name,
 260                                          netbios_domain,
 261                                          dns_name,
 262                                          dns_domain,
 263                                          &gensec_ntlmssp->ntlmssp_state);
 264         if (!NT_STATUS_IS_OK(nt_status)) {
 265                 return nt_status;
 266         }
 267
 268         gensec_ntlmssp->ntlmssp_state->callback_private = gensec_ntlmssp;
 269
 270         gensec_ntlmssp->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 271         gensec_ntlmssp->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 272         gensec_ntlmssp->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 273         gensec_ntlmssp->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 274
 275         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 276                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 277         }
 278         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 279                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 280         }
 281         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 282                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 283                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 284         }
 285
 286         return NT_STATUS_OK;
 287 }
 288
 289 static const char *gensec_ntlmssp3_server_oids[] = {
 290         GENSEC_OID_NTLMSSP,
 291         NULL
 292 };
 293
 294 const struct gensec_security_ops gensec_ntlmssp3_server_ops = {
 295         .name           = "ntlmssp3_server",
 296         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 297         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 298         .oid            = gensec_ntlmssp3_server_oids,
 299         .server_start   = gensec_ntlmssp3_server_start,
 300         .magic          = gensec_ntlmssp_magic,
 301         .update         = gensec_ntlmssp3_server_update,
 302         .sig_size       = gensec_ntlmssp_sig_size,
 303         .sign_packet    = gensec_ntlmssp_sign_packet,
 304         .check_packet   = gensec_ntlmssp_check_packet,
 305         .seal_packet    = gensec_ntlmssp_seal_packet,
 306         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 307         .wrap           = gensec_ntlmssp_wrap,
 308         .unwrap         = gensec_ntlmssp_unwrap,
 309         .session_key    = gensec_ntlmssp_session_key,
 310         .session_info   = gensec_ntlmssp_session_info,
 311         .have_feature   = gensec_ntlmssp_have_feature,
 312         .enabled        = true,
 313         .priority       = GENSEC_NTLMSSP
 314 };
 315