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         BOOL username_was_mapped;
  84
  85         /* the client has given us its machine name (which we otherwise would not get on port 445).
  86            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
  87
  88         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->workstation, True);
  89
  90         /* setup the string used by %U */
  91         /* sub_set_smb_name checks for weird internally */
  92         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
  93
  94         reload_services(True);
  95
  96         nt_status = make_user_info_map(&user_info,
  97                                        auth_ntlmssp_state->ntlmssp_state->user,
  98                                        auth_ntlmssp_state->ntlmssp_state->domain,
  99                                        auth_ntlmssp_state->ntlmssp_state->workstation,
 100                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 101                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 102                                        NULL, NULL, NULL,
 103                                        True);
 104
 105         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 106
 107         if (!NT_STATUS_IS_OK(nt_status)) {
 108                 return nt_status;
 109         }
 110
 111         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 112                                                                           user_info, &auth_ntlmssp_state->server_info);
 113
 114         username_was_mapped = user_info->was_mapped;
 115
 116         free_user_info(&user_info);
 117
 118         if (!NT_STATUS_IS_OK(nt_status)) {
 119                 return nt_status;
 120         }
 121
 122         auth_ntlmssp_state->server_info->was_mapped |= username_was_mapped;
 123
 124         nt_status = create_local_token(auth_ntlmssp_state->server_info);
 125
 126         if (!NT_STATUS_IS_OK(nt_status)) {
 127                 DEBUG(10, ("create_local_token failed\n"));
 128                 return nt_status;
 129         }
 130
 131         if (auth_ntlmssp_state->server_info->user_session_key.length) {
 132                 DEBUG(10, ("Got NT session key of length %u\n",
 133                         (unsigned int)auth_ntlmssp_state->server_info->user_session_key.length));
 134                 *user_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 135                                                    auth_ntlmssp_state->server_info->user_session_key.data,
 136                                                    auth_ntlmssp_state->server_info->user_session_key.length);
 137         }
 138         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 139                 DEBUG(10, ("Got LM session key of length %u\n",
 140                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 141                 *lm_session_key = data_blob_talloc(auth_ntlmssp_state->mem_ctx,
 142                                                    auth_ntlmssp_state->server_info->lm_session_key.data,
 143                                                    auth_ntlmssp_state->server_info->lm_session_key.length);
 144         }
 145         return nt_status;
 146 }
 147
 148 NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 149 {
 150         NTSTATUS nt_status;
 151         TALLOC_CTX *mem_ctx;
 152
 153         mem_ctx = talloc_init("AUTH NTLMSSP context");
 154
 155         *auth_ntlmssp_state = TALLOC_ZERO_P(mem_ctx, AUTH_NTLMSSP_STATE);
 156         if (!*auth_ntlmssp_state) {
 157                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 158                 talloc_destroy(mem_ctx);
 159                 return NT_STATUS_NO_MEMORY;
 160         }
 161
 162         ZERO_STRUCTP(*auth_ntlmssp_state);
 163
 164         (*auth_ntlmssp_state)->mem_ctx = mem_ctx;
 165
 166         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_start(&(*auth_ntlmssp_state)->ntlmssp_state))) {
 167                 return nt_status;
 168         }
 169
 170         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&(*auth_ntlmssp_state)->auth_context))) {
 171                 return nt_status;
 172         }
 173
 174         (*auth_ntlmssp_state)->ntlmssp_state->auth_context = (*auth_ntlmssp_state);
 175         (*auth_ntlmssp_state)->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 176         (*auth_ntlmssp_state)->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 177         (*auth_ntlmssp_state)->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 178         (*auth_ntlmssp_state)->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 179         (*auth_ntlmssp_state)->ntlmssp_state->server_role = (enum server_types)lp_server_role();
 180
 181         return NT_STATUS_OK;
 182 }
 183
 184 void auth_ntlmssp_end(AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
 185 {
 186         TALLOC_CTX *mem_ctx = (*auth_ntlmssp_state)->mem_ctx;
 187
 188         if ((*auth_ntlmssp_state)->ntlmssp_state) {
 189                 ntlmssp_end(&(*auth_ntlmssp_state)->ntlmssp_state);
 190         }
 191         if ((*auth_ntlmssp_state)->auth_context) {
 192                 ((*auth_ntlmssp_state)->auth_context->free)(&(*auth_ntlmssp_state)->auth_context);
 193         }
 194         if ((*auth_ntlmssp_state)->server_info) {
 195                 TALLOC_FREE((*auth_ntlmssp_state)->server_info);
 196         }
 197         talloc_destroy(mem_ctx);
 198         *auth_ntlmssp_state = NULL;
 199 }
 200
 201 NTSTATUS auth_ntlmssp_update(AUTH_NTLMSSP_STATE *auth_ntlmssp_state,
 202                              const DATA_BLOB request, DATA_BLOB *reply)
 203 {
 204         return ntlmssp_update(auth_ntlmssp_state->ntlmssp_state, request, reply);
 205 }