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 challange,
  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 *nt_session_key, DATA_BLOB *lm_session_key)
  79 {
  80         AUTH_NTLMSSP_STATE *auth_ntlmssp_state = ntlmssp_state->auth_context;
  81         uint32 auth_flags = AUTH_FLAG_NONE;
  82         auth_usersupplied_info *user_info = NULL;
  83         DATA_BLOB plaintext_password = data_blob(NULL, 0);
  84         NTSTATUS nt_status;
  85
  86         if (auth_ntlmssp_state->ntlmssp_state->lm_resp.length) {
  87                 auth_flags |= AUTH_FLAG_LM_RESP;
  88         }
  89
  90         if (auth_ntlmssp_state->ntlmssp_state->nt_resp.length == 24) {
  91                 auth_flags |= AUTH_FLAG_NTLM_RESP;
  92         } else  if (auth_ntlmssp_state->ntlmssp_state->nt_resp.length > 24) {
  93                 auth_flags |= AUTH_FLAG_NTLMv2_RESP;
  94         }
  95
  96         /* the client has given us its machine name (which we otherwise would not get on port 445).
  97            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  98
  99         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->workstation, True);
 100
 101         /* setup the string used by %U */
 102         /* sub_set_smb_name checks for weird internally */
 103         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
 104
 105         reload_services(True);
 106
 107         nt_status = make_user_info_map(&user_info,
 108                                        auth_ntlmssp_state->ntlmssp_state->user,
 109                                        auth_ntlmssp_state->ntlmssp_state->domain,
 110                                        auth_ntlmssp_state->ntlmssp_state->workstation,
 111                                        auth_ntlmssp_state->ntlmssp_state->lm_resp,
 112                                        auth_ntlmssp_state->ntlmssp_state->nt_resp,
 113                                        plaintext_password,
 114                                        auth_flags, True);
 115
 116         if (!NT_STATUS_IS_OK(nt_status)) {
 117                 return nt_status;
 118         }
 119
 120         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 121                                                                           user_info, &auth_ntlmssp_state->server_info);
 122
 123         free_user_info(&user_info);
 124
 125         if (!NT_STATUS_IS_OK(nt_status)) {
 126                 return nt_status;
 127         }
 128         if (auth_ntlmssp_state->server_info->nt_session_key.length) {
 129                 DEBUG(10, ("Got NT session key of length %u\n", auth_ntlmssp_state->server_info->nt_session_key.length));
 130                 *nt_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 131                                                    auth_ntlmssp_state->server_info->nt_session_key.data,
 132                                                    auth_ntlmssp_state->server_info->nt_session_key.length);
 133         }
 134         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 135                 DEBUG(10, ("Got LM session key of length %u\n", auth_ntlmssp_state->server_info->lm_session_key.length));
 136                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 137                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 138                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 139         }
 140         return nt_status;
 141 }
 142
 143 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 144 {
 145         NTSTATUS nt_status;
 146         TALLOC_CTX *mem_ctx;
 147
 148         mem_ctx = talloc_init("AUTH NTLMSSP context");
 149
 150         *auth_ntlmssp_state = talloc_zero(mem_ctx, sizeof(**auth_ntlmssp_state));
 151         if (!*auth_ntlmssp_state) {
 152                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 153                 talloc_destroy(mem_ctx);
 154                 return NT_STATUS_NO_MEMORY;
 155         }
 156
 157         ZERO_STRUCTP(*auth_ntlmssp_state);
 158
 159         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 160
 161         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 162                 return nt_status;
 163         }
 164
 165         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 166                 return nt_status;
 167         }
 168
 169         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 170         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 171         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 172         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 173         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 174         (*auth_ntlmssp_state)->ntlmssp_state->server_role = lp_server_role();
 175
 176         return NT_STATUS_OK;
 177 }
 178
 179 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 180 {
 181         TALLOC_CTX *mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 182
 183         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 184                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 185         }
 186         if ((*auth_ntlmssp_state)->auth_context) {
 187                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 188         }
 189         if ((*auth_ntlmssp_state)->server_info) {
 190                 free_server_info(&(*auth_ntlmssp_state)->server_info);
 191         }
 192         talloc_destroy(mem_ctx);
 193         *auth_ntlmssp_state = NULL;
 194 }
 195
 196 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 197                              const DATA_BLOB request, DATA_BLOB *reply)
 198 {
 199         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 200 }