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 2001-2003
   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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth.h"
  25 #include "../libcli/auth/ntlmssp.h"
  26 #include "ntlmssp_wrap.h"
  27 #include "../librpc/gen_ndr/netlogon.h"
  28 #include "smbd/smbd.h"
  29
  30 NTSTATUS auth_ntlmssp_steal_session_info(TALLOC_CTX *mem_ctx,
  31                                         struct auth_ntlmssp_state *auth_ntlmssp_state,
  32                                         struct auth_serversupplied_info **session_info)
  33 {
  34         NTSTATUS nt_status = create_local_token(mem_ctx,
  35                                                 auth_ntlmssp_state->server_info,
  36                                                 &auth_ntlmssp_state->ntlmssp_state->session_key,
  37                                                 session_info);
  38
  39         if (!NT_STATUS_IS_OK(nt_status)) {
  40                 DEBUG(10, ("create_local_token failed: %s\n",
  41                            nt_errstr(nt_status)));
  42         }
  43         return nt_status;
  44 }
  45
  46 /**
  47  * Return the challenge as determined by the authentication subsystem
  48  * @return an 8 byte random challenge
  49  */
  50
  51 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  52                                            uint8_t chal[8])
  53 {
  54         struct auth_ntlmssp_state *auth_ntlmssp_state =
  55                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  56         auth_ntlmssp_state->auth_context->get_ntlm_challenge(
  57                 auth_ntlmssp_state->auth_context, chal);
  58         return NT_STATUS_OK;
  59 }
  60
  61 /**
  62  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  63  *
  64  * @return If the effective challenge used by the auth subsystem may be modified
  65  */
  66 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  67 {
  68         struct auth_ntlmssp_state *auth_ntlmssp_state =
  69                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  70         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  71
  72         return auth_context->challenge_may_be_modified;
  73 }
  74
  75 /**
  76  * NTLM2 authentication modifies the effective challenge,
  77  * @param challenge The new challenge value
  78  */
  79 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  80 {
  81         struct auth_ntlmssp_state *auth_ntlmssp_state =
  82                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
  83         struct auth_context *auth_context = auth_ntlmssp_state->auth_context;
  84
  85         SMB_ASSERT(challenge->length == 8);
  86
  87         auth_context->challenge = data_blob_talloc(auth_context,
  88                                                    challenge->data, challenge->length);
  89
  90         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
  91
  92         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
  93         DEBUG(5, ("challenge is: \n"));
  94         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
  95         return NT_STATUS_OK;
  96 }
  97
  98 /**
  99  * Check the password on an NTLMSSP login.
 100  *
 101  * Return the session keys used on the connection.
 102  */
 103
 104 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, TALLOC_CTX *mem_ctx,
 105                                             DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 106 {
 107         struct auth_ntlmssp_state *auth_ntlmssp_state =
 108                 (struct auth_ntlmssp_state *)ntlmssp_state->callback_private;
 109         struct auth_usersupplied_info *user_info = NULL;
 110         NTSTATUS nt_status;
 111         bool username_was_mapped;
 112
 113         /* the client has given us its machine name (which we otherwise would not get on port 445).
 114            we need to possibly reload smb.conf if smb.conf includes depend on the machine name */
 115
 116         set_remote_machine_name(auth_ntlmssp_state->ntlmssp_state->client.netbios_name, True);
 117
 118         /* setup the string used by %U */
 119         /* sub_set_smb_name checks for weird internally */
 120         sub_set_smb_name(auth_ntlmssp_state->ntlmssp_state->user);
 121
 122         reload_services(smbd_messaging_context(), -1, True);
 123
 124         nt_status = make_user_info_map(&user_info,
 125                                        auth_ntlmssp_state->ntlmssp_state->user,
 126                                        auth_ntlmssp_state->ntlmssp_state->domain,
 127                                        auth_ntlmssp_state->ntlmssp_state->client.netbios_name,
 128                                        auth_ntlmssp_state->ntlmssp_state->lm_resp.data ? &auth_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 129                                        auth_ntlmssp_state->ntlmssp_state->nt_resp.data ? &auth_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 130                                        NULL, NULL, NULL,
 131                                        AUTH_PASSWORD_RESPONSE);
 132
 133         if (!NT_STATUS_IS_OK(nt_status)) {
 134                 return nt_status;
 135         }
 136
 137         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 138
 139         nt_status = auth_ntlmssp_state->auth_context->check_ntlm_password(auth_ntlmssp_state->auth_context,
 140                                                                           user_info, &auth_ntlmssp_state->server_info);
 141
 142         username_was_mapped = user_info->was_mapped;
 143
 144         free_user_info(&user_info);
 145
 146         if (!NT_STATUS_IS_OK(nt_status)) {
 147                 return nt_status;
 148         }
 149
 150         auth_ntlmssp_state->server_info->nss_token |= username_was_mapped;
 151
 152         /* Clear out the session keys, and pass them to the caller.
 153          * They will not be used in this form again - instead the
 154          * NTLMSSP code will decide on the final correct session key,
 155          * and put it back here at the end of
 156          * auth_ntlmssp_steal_server_info */
 157         if (auth_ntlmssp_state->server_info->session_key.length) {
 158                 DEBUG(10, ("Got NT session key of length %u\n",
 159                         (unsigned int)auth_ntlmssp_state->server_info->session_key.length));
 160                 *session_key = auth_ntlmssp_state->server_info->session_key;
 161                 talloc_steal(mem_ctx, auth_ntlmssp_state->server_info->session_key.data);
 162                 auth_ntlmssp_state->server_info->session_key = data_blob_null;
 163         }
 164         if (auth_ntlmssp_state->server_info->lm_session_key.length) {
 165                 DEBUG(10, ("Got LM session key of length %u\n",
 166                         (unsigned int)auth_ntlmssp_state->server_info->lm_session_key.length));
 167                 *lm_session_key = auth_ntlmssp_state->server_info->lm_session_key;
 168                 talloc_steal(mem_ctx, auth_ntlmssp_state->server_info->lm_session_key.data);
 169                 auth_ntlmssp_state->server_info->lm_session_key = data_blob_null;
 170         }
 171         return nt_status;
 172 }
 173
 174 static int auth_ntlmssp_state_destructor(void *ptr);
 175
 176 NTSTATUS auth_ntlmssp_start(struct auth_ntlmssp_state **auth_ntlmssp_state)
 177 {
 178         NTSTATUS nt_status;
 179         bool is_standalone;
 180         const char *netbios_name;
 181         const char *netbios_domain;
 182         const char *dns_name;
 183         char *dns_domain;
 184         struct auth_ntlmssp_state *ans;
 185         struct auth_context *auth_context;
 186
 187         if ((enum server_role)lp_server_role() == ROLE_STANDALONE) {
 188                 is_standalone = true;
 189         } else {
 190                 is_standalone = false;
 191         }
 192
 193         netbios_name = lp_netbios_name();
 194         netbios_domain = lp_workgroup();
 195         /* This should be a 'netbios domain -> DNS domain' mapping */
 196         dns_domain = get_mydnsdomname(talloc_tos());
 197         if (dns_domain) {
 198                 strlower_m(dns_domain);
 199         }
 200         dns_name = get_mydnsfullname();
 201
 202         ans = talloc_zero(NULL, struct auth_ntlmssp_state);
 203         if (!ans) {
 204                 DEBUG(0,("auth_ntlmssp_start: talloc failed!\n"));
 205                 return NT_STATUS_NO_MEMORY;
 206         }
 207
 208         nt_status = ntlmssp_server_start(ans,
 209                                          is_standalone,
 210                                          netbios_name,
 211                                          netbios_domain,
 212                                          dns_name,
 213                                          dns_domain,
 214                                          &ans->ntlmssp_state);
 215         if (!NT_STATUS_IS_OK(nt_status)) {
 216                 return nt_status;
 217         }
 218
 219         nt_status = make_auth_context_subsystem(talloc_tos(), &auth_context);
 220         if (!NT_STATUS_IS_OK(nt_status)) {
 221                 return nt_status;
 222         }
 223         ans->auth_context = talloc_steal(ans, auth_context);
 224
 225         ans->ntlmssp_state->callback_private = ans;
 226         ans->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 227         ans->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 228         ans->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 229         ans->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 230
 231         talloc_set_destructor((TALLOC_CTX *)ans, auth_ntlmssp_state_destructor);
 232
 233         *auth_ntlmssp_state = ans;
 234         return NT_STATUS_OK;
 235 }
 236
 237 static int auth_ntlmssp_state_destructor(void *ptr)
 238 {
 239         struct auth_ntlmssp_state *ans;
 240
 241         ans = talloc_get_type(ptr, struct auth_ntlmssp_state);
 242
 243         TALLOC_FREE(ans->server_info);
 244         TALLOC_FREE(ans->ntlmssp_state);
 245         return 0;
 246 }