source/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /**
  27  * Return the challenge as determined by the authentication subsystem
  28  * @return an 8 byte random challenge
  29  */
  30
  31 static const uint8 *auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state)
  32 {
  33         AUTH_NTLMSSP_STATE *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 = ntlmssp_state->auth_context;
  45         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  46
  47         return auth_context->challenge_may_be_modified;
  48 }
  49
  50 /**
  51  * NTLM2 authentication modifies the effective challenge,
  52  * @param challenge The new challenge value
  53  */
  54 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  55 {
  56         AUTH_NTLMSSP_STATE *auth_ntlmssp_state = ntlmssp_state->auth_context;
  57         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  58
  59         SMB_ASSERT(challenge->length == 8);
  60
  61         auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
  62                                                    challenge->data, challenge->length);
  63
  64         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
  65
  66         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  67         DEBUG(5, ("challenge is: \n"));
  68         dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
  69         return NT_STATUS_OK;
  70 }
  71
  72 /**
  73  * Check the password on an NTLMSSP login.
  74  *
  75  * Return the session keys used on the connection.
  76  */
  77
  78 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
  79 {
  80         AUTH_NTLMSSP_STATE *auth_ntlmssp_state = ntlmssp_state->auth_context;
  81         auth_usersupplied_info *user_info = NULL;
  82         NTSTATUS nt_status;
  83
  84         /* the client has given us its machine name (which we otherwise would not get on port 445).
  85            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  86
  87         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->workstation, True);
  88
  89         /* setup the string used by %U */
  90         /* sub_set_smb_name checks for weird internally */
  91         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
  92
  93         reload_services(True);
  94
  95         nt_status = make_user_info_map(&user_info,
  96                                        auth_ntlmssp_state->ntlmssp_state->user,
  97                                        auth_ntlmssp_state->ntlmssp_state->domain,
  98                                        auth_ntlmssp_state->ntlmssp_state->workstation,
  99                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 100                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 101                                        NULL, NULL, NULL,
 102                                        True);
 103
 104         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 105
 106         if (!NT_STATUS_IS_OK(nt_status)) {
 107                 return nt_status;
 108         }
 109
 110         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 111                                                                           user_info, &auth_ntlmssp_state->server_info);
 112
 113         free_user_info(&user_info);
 114
 115         if (!NT_STATUS_IS_OK(nt_status)) {
 116                 return nt_status;
 117         }
 118         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 119                 DEBUG(10, ("Got NT session key of length %u\n",
 120                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 121                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 122                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 123                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 124         }
 125         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 126                 DEBUG(10, ("Got LM session key of length %u\n",
 127                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 128                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 129                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 130                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 131         }
 132         return nt_status;
 133 }
 134
 135 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 136 {
 137         NTSTATUS nt_status;
 138         TALLOC_CTX *mem_ctx;
 139
 140         mem_ctx = talloc_init("AUTH NTLMSSP context");
 141
 142         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 143         if (!*auth_ntlmssp_state) {
 144                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 145                 talloc_destroy(mem_ctx);
 146                 return NT_STATUS_NO_MEMORY;
 147         }
 148
 149         ZERO_STRUCTP(*auth_ntlmssp_state);
 150
 151         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 152
 153         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 154                 return nt_status;
 155         }
 156
 157         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 158                 return nt_status;
 159         }
 160
 161         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 162         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 163         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 164         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 165         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 166         (*auth_ntlmssp_state)->ntlmssp_state->server_role = lp_server_role();
 167
 168         return NT_STATUS_OK;
 169 }
 170
 171 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 172 {
 173         TALLOC_CTX *mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 174
 175         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 176                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 177         }
 178         if ((*auth_ntlmssp_state)->auth_context) {
 179                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 180         }
 181         if ((*auth_ntlmssp_state)->server_info) {
 182                 free_server_info(&(*auth_ntlmssp_state)->server_info);
 183         }
 184         talloc_destroy(mem_ctx);
 185         *auth_ntlmssp_state = NULL;
 186 }
 187
 188 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 189                              const DATA_BLOB request, DATA_BLOB *reply)
 190 {
 191         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 192 }