source/auth/auth_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authentication utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Andrew Bartlett 2001
   6    Copyright (C) Jeremy Allison 2000-2001
   7    Copyright (C) Rafal Szczesniak 2002
   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/auth.h"
  26 #include "libcli/security/security.h"
  27 #include "libcli/auth/libcli_auth.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "param/param.h"
  31
  32 /* this default function can be used by mostly all backends
  33  * which don't want to set a challenge
  34  */
  35 NTSTATUS auth_get_challenge_not_implemented(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, DATA_BLOB *challenge)
  36 {
  37         /* we don't want to set a challenge */
  38         return NT_STATUS_NOT_IMPLEMENTED;
  39 }
  40
  41 /****************************************************************************
  42  Create an auth_usersupplied_data structure after appropriate mapping.
  43 ****************************************************************************/
  44
  45 NTSTATUS map_user_info(TALLOC_CTX *mem_ctx,
  46                        const struct auth_usersupplied_info *user_info,
  47                        struct auth_usersupplied_info **user_info_mapped)
  48 {
  49         const char *domain;
  50         char *account_name;
  51         char *d;
  52         DEBUG(5,("map_user_info: Mapping user [%s]\\[%s] from workstation [%s]\n",
  53                 user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
  54
  55         account_name = talloc_strdup(mem_ctx, user_info->client.account_name);
  56         if (!account_name) {
  57                 return NT_STATUS_NO_MEMORY;
  58         }
  59
  60         /* don't allow "" as a domain, fixes a Win9X bug
  61            where it doesn't supply a domain for logon script
  62            'net use' commands.                                 */
  63
  64         /* Split user@realm names into user and realm components.  This is TODO to fix with proper userprincipalname support */
  65         if (user_info->client.domain_name && *user_info->client.domain_name) {
  66                 domain = user_info->client.domain_name;
  67         } else if (strchr_m(user_info->client.account_name, '@')) {
  68                 d = strchr_m(account_name, '@');
  69                 if (!d) {
  70                         return NT_STATUS_INTERNAL_ERROR;
  71                 }
  72                 d[0] = '\0';
  73                 d++;
  74                 domain = d;
  75         } else {
  76                 domain = lp_workgroup(global_loadparm);
  77         }
  78
  79         *user_info_mapped = talloc(mem_ctx, struct auth_usersupplied_info);
  80         if (!*user_info_mapped) {
  81                 return NT_STATUS_NO_MEMORY;
  82         }
  83         talloc_reference(*user_info_mapped, user_info);
  84         **user_info_mapped = *user_info;
  85         (*user_info_mapped)->mapped_state = true;
  86         (*user_info_mapped)->mapped.domain_name = talloc_strdup(*user_info_mapped, domain);
  87         (*user_info_mapped)->mapped.account_name = talloc_strdup(*user_info_mapped, account_name);
  88         talloc_free(account_name);
  89         if (!(*user_info_mapped)->mapped.domain_name
  90             || !(*user_info_mapped)->mapped.account_name) {
  91                 return NT_STATUS_NO_MEMORY;
  92         }
  93
  94         return NT_STATUS_OK;
  95 }
  96
  97 /****************************************************************************
  98  Create an auth_usersupplied_data structure after appropriate mapping.
  99 ****************************************************************************/
 100
 101 NTSTATUS encrypt_user_info(TALLOC_CTX *mem_ctx, struct auth_context *auth_context,
 102                            enum auth_password_state to_state,
 103                            const struct auth_usersupplied_info *user_info_in,
 104                            const struct auth_usersupplied_info **user_info_encrypted)
 105 {
 106         NTSTATUS nt_status;
 107         struct auth_usersupplied_info *user_info_temp;
 108         switch (to_state) {
 109         case AUTH_PASSWORD_RESPONSE:
 110                 switch (user_info_in->password_state) {
 111                 case AUTH_PASSWORD_PLAIN:
 112                 {
 113                         const struct auth_usersupplied_info *user_info_temp2;
 114                         nt_status = encrypt_user_info(mem_ctx, auth_context,
 115                                                       AUTH_PASSWORD_HASH,
 116                                                       user_info_in, &user_info_temp2);
 117                         if (!NT_STATUS_IS_OK(nt_status)) {
 118                                 return nt_status;
 119                         }
 120                         user_info_in = user_info_temp2;
 121                         /* fall through */
 122                 }
 123                 case AUTH_PASSWORD_HASH:
 124                 {
 125                         const uint8_t *challenge;
 126                         DATA_BLOB chall_blob;
 127                         user_info_temp = talloc(mem_ctx, struct auth_usersupplied_info);
 128                         if (!user_info_temp) {
 129                                 return NT_STATUS_NO_MEMORY;
 130                         }
 131                         talloc_reference(user_info_temp, user_info_in);
 132                         *user_info_temp = *user_info_in;
 133                         user_info_temp->mapped_state = to_state;
 134
 135                         nt_status = auth_get_challenge(auth_context, &challenge);
 136                         if (!NT_STATUS_IS_OK(nt_status)) {
 137                                 return nt_status;
 138                         }
 139
 140                         chall_blob = data_blob_talloc(mem_ctx, challenge, 8);
 141                         if (lp_client_ntlmv2_auth(auth_context->lp_ctx)) {
 142                                 DATA_BLOB names_blob = NTLMv2_generate_names_blob(mem_ctx, lp_netbios_name(auth_context->lp_ctx), lp_workgroup(auth_context->lp_ctx));
 143                                 DATA_BLOB lmv2_response, ntlmv2_response, lmv2_session_key, ntlmv2_session_key;
 144
 145                                 if (!SMBNTLMv2encrypt_hash(user_info_temp,
 146                                                            user_info_in->client.account_name,
 147                                                            user_info_in->client.domain_name,
 148                                                            user_info_in->password.hash.nt->hash, &chall_blob,
 149                                                            &names_blob,
 150                                                            &lmv2_response, &ntlmv2_response,
 151                                                            &lmv2_session_key, &ntlmv2_session_key)) {
 152                                         data_blob_free(&names_blob);
 153                                         return NT_STATUS_NO_MEMORY;
 154                                 }
 155                                 data_blob_free(&names_blob);
 156                                 user_info_temp->password.response.lanman = lmv2_response;
 157                                 user_info_temp->password.response.nt = ntlmv2_response;
 158
 159                                 data_blob_free(&lmv2_session_key);
 160                                 data_blob_free(&ntlmv2_session_key);
 161                         } else {
 162                                 DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
 163                                 SMBOWFencrypt(user_info_in->password.hash.nt->hash, challenge, blob.data);
 164
 165                                 user_info_temp->password.response.nt = blob;
 166                                 if (lp_client_lanman_auth(auth_context->lp_ctx) && user_info_in->password.hash.lanman) {
 167                                         DATA_BLOB lm_blob = data_blob_talloc(mem_ctx, NULL, 24);
 168                                         SMBOWFencrypt(user_info_in->password.hash.lanman->hash, challenge, blob.data);
 169                                         user_info_temp->password.response.lanman = lm_blob;
 170                                 } else {
 171                                         /* if not sending the LM password, send the NT password twice */
 172                                         user_info_temp->password.response.lanman = user_info_temp->password.response.nt;
 173                                 }
 174                         }
 175
 176                         user_info_in = user_info_temp;
 177                         /* fall through */
 178                 }
 179                 case AUTH_PASSWORD_RESPONSE:
 180                         *user_info_encrypted = user_info_in;
 181                 }
 182                 break;
 183         case AUTH_PASSWORD_HASH:
 184         {
 185                 switch (user_info_in->password_state) {
 186                 case AUTH_PASSWORD_PLAIN:
 187                 {
 188                         struct samr_Password lanman;
 189                         struct samr_Password nt;
 190
 191                         user_info_temp = talloc(mem_ctx, struct auth_usersupplied_info);
 192                         if (!user_info_temp) {
 193                                 return NT_STATUS_NO_MEMORY;
 194                         }
 195                         talloc_reference(user_info_temp, user_info_in);
 196                         *user_info_temp = *user_info_in;
 197                         user_info_temp->mapped_state = to_state;
 198
 199                         if (E_deshash(user_info_in->password.plaintext, lanman.hash)) {
 200                                 user_info_temp->password.hash.lanman = talloc(user_info_temp,
 201                                                                               struct samr_Password);
 202                                 *user_info_temp->password.hash.lanman = lanman;
 203                         } else {
 204                                 user_info_temp->password.hash.lanman = NULL;
 205                         }
 206
 207                         E_md4hash(user_info_in->password.plaintext, nt.hash);
 208                         user_info_temp->password.hash.nt = talloc(user_info_temp,
 209                                                                    struct samr_Password);
 210                         *user_info_temp->password.hash.nt = nt;
 211
 212                         user_info_in = user_info_temp;
 213                         /* fall through */
 214                 }
 215                 case AUTH_PASSWORD_HASH:
 216                         *user_info_encrypted = user_info_in;
 217                         break;
 218                 default:
 219                         return NT_STATUS_INVALID_PARAMETER;
 220                         break;
 221                 }
 222                 break;
 223         }
 224         default:
 225                 return NT_STATUS_INVALID_PARAMETER;
 226         }
 227
 228         return NT_STATUS_OK;
 229 }
 230
 231
 232 /**
 233  * Squash an NT_STATUS in line with security requirements.
 234  * In an attempt to avoid giving the whole game away when users
 235  * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
 236  * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
 237  * (session setups in particular).
 238  *
 239  * @param nt_status NTSTATUS input for squashing.
 240  * @return the 'squashed' nt_status
 241  **/
 242 NTSTATUS auth_nt_status_squash(NTSTATUS nt_status)
 243 {
 244         if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
 245                 /* Match WinXP and don't give the game away */
 246                 return NT_STATUS_LOGON_FAILURE;
 247         } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
 248                 /* Match WinXP and don't give the game away */
 249                 return NT_STATUS_LOGON_FAILURE;
 250         }
 251
 252         return nt_status;
 253 }