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
  27 NTSTATUS auth3_generate_session_info(struct auth4_context *auth_context,
  28                                      TALLOC_CTX *mem_ctx,
  29                                      void *server_returned_info,
  30                                      const char *original_user_name,
  31                                      uint32_t session_info_flags,
  32                                      struct auth_session_info **session_info)
  33 {
  34         struct auth_serversupplied_info *server_info = talloc_get_type_abort(server_returned_info,
  35                                                                              struct auth_serversupplied_info);
  36         NTSTATUS nt_status;
  37
  38         nt_status = create_local_token(mem_ctx,
  39                                        server_info,
  40                                        NULL,
  41                                        original_user_name,
  42                                        session_info);
  43         if (!NT_STATUS_IS_OK(nt_status)) {
  44                 DEBUG(10, ("create_local_token failed: %s\n",
  45                            nt_errstr(nt_status)));
  46                 return nt_status;
  47         }
  48
  49         return NT_STATUS_OK;
  50 }
  51
  52 /**
  53  * Return the challenge as determined by the authentication subsystem
  54  * @return an 8 byte random challenge
  55  */
  56
  57 NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
  58                                            uint8_t chal[8])
  59 {
  60         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  61                                                                   struct auth_context);
  62         auth_get_ntlm_challenge(auth_context, chal);
  63         return NT_STATUS_OK;
  64 }
  65
  66 /**
  67  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  68  *
  69  * @return If the effective challenge used by the auth subsystem may be modified
  70  */
  71 bool auth3_may_set_challenge(struct auth4_context *auth4_context)
  72 {
  73         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  74                                                                   struct auth_context);
  75         return auth_context->challenge_may_be_modified;
  76 }
  77
  78 /**
  79  * NTLM2 authentication modifies the effective challenge,
  80  * @param challenge The new challenge value
  81  */
  82 NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
  83                              const char *challenge_set_by)
  84 {
  85         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  86                                                                   struct auth_context);
  87
  88         auth_context->challenge = data_blob_talloc(auth_context,
  89                                                    chal, 8);
  90         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge.data);
  91
  92         auth_context->challenge_set_by = talloc_strdup(auth_context, challenge_set_by);
  93         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge_set_by);
  94
  95         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  96         DEBUG(5, ("challenge is: \n"));
  97         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
  98         return NT_STATUS_OK;
  99 }
 100
 101 /**
 102  * Check the password on an NTLMSSP login.
 103  *
 104  * Return the session keys used on the connection.
 105  */
 106
 107 NTSTATUS auth3_check_password(struct auth4_context *auth4_context,
 108                               TALLOC_CTX *mem_ctx,
 109                               const struct auth_usersupplied_info *user_info,
 110                               void **server_returned_info,
 111                               DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 112 {
 113         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 114                                                                   struct auth_context);
 115         struct auth_usersupplied_info *mapped_user_info = NULL;
 116         struct auth_serversupplied_info *server_info;
 117         NTSTATUS nt_status;
 118         bool username_was_mapped;
 119
 120         /* The client has given us its machine name (which we only get over NBT transport).
 121            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 122
 123         set_remote_machine_name(user_info->workstation_name, True);
 124
 125         /* setup the string used by %U */
 126         /* sub_set_smb_name checks for weird internally */
 127         sub_set_smb_name(user_info->client.account_name);
 128
 129         lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
 130
 131         nt_status = make_user_info_map(&mapped_user_info,
 132                                        user_info->client.account_name,
 133                                        user_info->client.domain_name,
 134                                        user_info->workstation_name,
 135                                        user_info->remote_host,
 136                                        user_info->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
 137                                        user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
 138                                        NULL, NULL, NULL,
 139                                        AUTH_PASSWORD_RESPONSE);
 140
 141         if (!NT_STATUS_IS_OK(nt_status)) {
 142                 return nt_status;
 143         }
 144
 145         mapped_user_info->logon_parameters = user_info->logon_parameters;
 146
 147         mapped_user_info->flags = user_info->flags;
 148
 149         nt_status = auth_check_ntlm_password(auth_context,
 150                                              mapped_user_info, &server_info);
 151
 152         if (!NT_STATUS_IS_OK(nt_status)) {
 153                 DEBUG(5,("Checking NTLMSSP password for %s\\%s failed: %s\n",
 154                          user_info->client.domain_name,
 155                          user_info->client.account_name,
 156                          nt_errstr(nt_status)));
 157         }
 158
 159         username_was_mapped = mapped_user_info->was_mapped;
 160
 161         free_user_info(&mapped_user_info);
 162
 163         if (!NT_STATUS_IS_OK(nt_status)) {
 164                 nt_status = do_map_to_guest_server_info(nt_status,
 165                                                         &server_info,
 166                                                         user_info->client.account_name,
 167                                                         user_info->client.domain_name);
 168                 *server_returned_info = talloc_steal(mem_ctx, server_info);
 169                 return nt_status;
 170         }
 171
 172         server_info->nss_token |= username_was_mapped;
 173
 174         /* Clear out the session keys, and pass them to the caller.
 175          * They will not be used in this form again - instead the
 176          * NTLMSSP code will decide on the final correct session key,
 177          * and supply it to create_local_token() */
 178         if (session_key) {
 179                 DEBUG(10, ("Got NT session key of length %u\n",
 180                         (unsigned int)server_info->session_key.length));
 181                 *session_key = server_info->session_key;
 182                 talloc_steal(mem_ctx, server_info->session_key.data);
 183                 server_info->session_key = data_blob_null;
 184         }
 185         if (lm_session_key) {
 186                 DEBUG(10, ("Got LM session key of length %u\n",
 187                         (unsigned int)server_info->lm_session_key.length));
 188                 *lm_session_key = server_info->lm_session_key;
 189                 talloc_steal(mem_ctx, server_info->lm_session_key.data);
 190                 server_info->lm_session_key = data_blob_null;
 191         }
 192
 193         *server_returned_info = talloc_steal(mem_ctx, server_info);
 194         return nt_status;
 195 }