source4/auth/ntlm/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 "auth/auth_proto.h"
  27 #include "libcli/security/security.h"
  28 #include "libcli/auth/libcli_auth.h"
  29 #include "dsdb/samdb/samdb.h"
  30 #include "auth/credentials/credentials.h"
  31 #include "param/param.h"
  32
  33 /* this default function can be used by mostly all backends
  34  * which don't want to set a challenge
  35  */
  36 NTSTATUS auth_get_challenge_not_implemented(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, DATA_BLOB *challenge)
  37 {
  38         /* we don't want to set a challenge */
  39         return NT_STATUS_NOT_IMPLEMENTED;
  40 }
  41
  42 /****************************************************************************
  43  Create an auth_usersupplied_data structure after appropriate mapping.
  44 ****************************************************************************/
  45
  46 NTSTATUS map_user_info(TALLOC_CTX *mem_ctx,
  47                        const char *default_domain,
  48                        const struct auth_usersupplied_info *user_info,
  49                        struct auth_usersupplied_info **user_info_mapped)
  50 {
  51         const char *domain;
  52         char *account_name;
  53         char *d;
  54         DEBUG(5,("map_user_info: Mapping user [%s]\\[%s] from workstation [%s]\n",
  55                 user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
  56
  57         account_name = talloc_strdup(mem_ctx, user_info->client.account_name);
  58         if (!account_name) {
  59                 return NT_STATUS_NO_MEMORY;
  60         }
  61
  62         /* don't allow "" as a domain, fixes a Win9X bug
  63            where it doesn't supply a domain for logon script
  64            'net use' commands.                                 */
  65
  66         /* Split user@realm names into user and realm components.  This is TODO to fix with proper userprincipalname support */
  67         if (user_info->client.domain_name && *user_info->client.domain_name) {
  68                 domain = user_info->client.domain_name;
  69         } else if (strchr_m(user_info->client.account_name, '@')) {
  70                 d = strchr_m(account_name, '@');
  71                 if (!d) {
  72                         return NT_STATUS_INTERNAL_ERROR;
  73                 }
  74                 d[0] = '\0';
  75                 d++;
  76                 domain = d;
  77         } else {
  78                 domain = default_domain;
  79         }
  80
  81         *user_info_mapped = talloc(mem_ctx, struct auth_usersupplied_info);
  82         if (!*user_info_mapped) {
  83                 return NT_STATUS_NO_MEMORY;
  84         }
  85         if (!talloc_reference(*user_info_mapped, user_info)) {
  86                 return NT_STATUS_NO_MEMORY;
  87         }
  88         **user_info_mapped = *user_info;
  89         (*user_info_mapped)->mapped_state = true;
  90         (*user_info_mapped)->mapped.domain_name = talloc_strdup(*user_info_mapped, domain);
  91         (*user_info_mapped)->mapped.account_name = talloc_strdup(*user_info_mapped, account_name);
  92         talloc_free(account_name);
  93         if (!(*user_info_mapped)->mapped.domain_name
  94             || !(*user_info_mapped)->mapped.account_name) {
  95                 return NT_STATUS_NO_MEMORY;
  96         }
  97
  98         return NT_STATUS_OK;
  99 }
 100
 101 /****************************************************************************
 102  Create an auth_usersupplied_data structure after appropriate mapping.
 103 ****************************************************************************/
 104
 105 NTSTATUS encrypt_user_info(TALLOC_CTX *mem_ctx, struct auth_context *auth_context,
 106                            enum auth_password_state to_state,
 107                            const struct auth_usersupplied_info *user_info_in,
 108                            const struct auth_usersupplied_info **user_info_encrypted)
 109 {
 110         NTSTATUS nt_status;
 111         struct auth_usersupplied_info *user_info_temp;
 112         switch (to_state) {
 113         case AUTH_PASSWORD_RESPONSE:
 114                 switch (user_info_in->password_state) {
 115                 case AUTH_PASSWORD_PLAIN:
 116                 {
 117                         const struct auth_usersupplied_info *user_info_temp2;
 118                         nt_status = encrypt_user_info(mem_ctx, auth_context,
 119                                                       AUTH_PASSWORD_HASH,
 120                                                       user_info_in, &user_info_temp2);
 121                         if (!NT_STATUS_IS_OK(nt_status)) {
 122                                 return nt_status;
 123                         }
 124                         user_info_in = user_info_temp2;
 125                         /* fall through */
 126                 }
 127                 case AUTH_PASSWORD_HASH:
 128                 {
 129                         const uint8_t *challenge;
 130                         DATA_BLOB chall_blob;
 131                         user_info_temp = talloc(mem_ctx, struct auth_usersupplied_info);
 132                         if (!user_info_temp) {
 133                                 return NT_STATUS_NO_MEMORY;
 134                         }
 135                         if (!talloc_reference(user_info_temp, user_info_in)) {
 136                                 return NT_STATUS_NO_MEMORY;
 137                         }
 138                         *user_info_temp = *user_info_in;
 139                         user_info_temp->mapped_state = to_state;
 140
 141                         nt_status = auth_get_challenge(auth_context, &challenge);
 142                         if (!NT_STATUS_IS_OK(nt_status)) {
 143                                 return nt_status;
 144                         }
 145
 146                         chall_blob = data_blob_talloc(mem_ctx, challenge, 8);
 147                         if (lp_client_ntlmv2_auth(auth_context->lp_ctx)) {
 148                                 DATA_BLOB names_blob = NTLMv2_generate_names_blob(mem_ctx, lp_iconv_convenience(auth_context->lp_ctx), lp_netbios_name(auth_context->lp_ctx), lp_workgroup(auth_context->lp_ctx));
 149                                 DATA_BLOB lmv2_response, ntlmv2_response, lmv2_session_key, ntlmv2_session_key;
 150
 151                                 if (!SMBNTLMv2encrypt_hash(user_info_temp,
 152                                                            user_info_in->client.account_name,
 153                                                            user_info_in->client.domain_name,
 154                                                            user_info_in->password.hash.nt->hash, &chall_blob,
 155                                                            &names_blob,
 156                                                            &lmv2_response, &ntlmv2_response,
 157                                                            &lmv2_session_key, &ntlmv2_session_key)) {
 158                                         data_blob_free(&names_blob);
 159                                         return NT_STATUS_NO_MEMORY;
 160                                 }
 161                                 data_blob_free(&names_blob);
 162                                 user_info_temp->password.response.lanman = lmv2_response;
 163                                 user_info_temp->password.response.nt = ntlmv2_response;
 164
 165                                 data_blob_free(&lmv2_session_key);
 166                                 data_blob_free(&ntlmv2_session_key);
 167                         } else {
 168                                 DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
 169                                 SMBOWFencrypt(user_info_in->password.hash.nt->hash, challenge, blob.data);
 170
 171                                 user_info_temp->password.response.nt = blob;
 172                                 if (lp_client_lanman_auth(auth_context->lp_ctx) && user_info_in->password.hash.lanman) {
 173                                         DATA_BLOB lm_blob = data_blob_talloc(mem_ctx, NULL, 24);
 174                                         SMBOWFencrypt(user_info_in->password.hash.lanman->hash, challenge, blob.data);
 175                                         user_info_temp->password.response.lanman = lm_blob;
 176                                 } else {
 177                                         /* if not sending the LM password, send the NT password twice */
 178                                         user_info_temp->password.response.lanman = user_info_temp->password.response.nt;
 179                                 }
 180                         }
 181
 182                         user_info_in = user_info_temp;
 183                         /* fall through */
 184                 }
 185                 case AUTH_PASSWORD_RESPONSE:
 186                         *user_info_encrypted = user_info_in;
 187                 }
 188                 break;
 189         case AUTH_PASSWORD_HASH:
 190         {
 191                 switch (user_info_in->password_state) {
 192                 case AUTH_PASSWORD_PLAIN:
 193                 {
 194                         struct samr_Password lanman;
 195                         struct samr_Password nt;
 196
 197                         user_info_temp = talloc(mem_ctx, struct auth_usersupplied_info);
 198                         if (!user_info_temp) {
 199                                 return NT_STATUS_NO_MEMORY;
 200                         }
 201                         if (!talloc_reference(user_info_temp, user_info_in)) {
 202                                 return NT_STATUS_NO_MEMORY;
 203                         }
 204                         *user_info_temp = *user_info_in;
 205                         user_info_temp->mapped_state = to_state;
 206
 207                         if (E_deshash(user_info_in->password.plaintext, lanman.hash)) {
 208                                 user_info_temp->password.hash.lanman = talloc(user_info_temp,
 209                                                                               struct samr_Password);
 210                                 *user_info_temp->password.hash.lanman = lanman;
 211                         } else {
 212                                 user_info_temp->password.hash.lanman = NULL;
 213                         }
 214
 215                         E_md4hash(user_info_in->password.plaintext, nt.hash);
 216                         user_info_temp->password.hash.nt = talloc(user_info_temp,
 217                                                                    struct samr_Password);
 218                         *user_info_temp->password.hash.nt = nt;
 219
 220                         user_info_in = user_info_temp;
 221                         /* fall through */
 222                 }
 223                 case AUTH_PASSWORD_HASH:
 224                         *user_info_encrypted = user_info_in;
 225                         break;
 226                 default:
 227                         return NT_STATUS_INVALID_PARAMETER;
 228                         break;
 229                 }
 230                 break;
 231         }
 232         default:
 233                 return NT_STATUS_INVALID_PARAMETER;
 234         }
 235
 236         return NT_STATUS_OK;
 237 }
 238
 239
 240 /**
 241  * Squash an NT_STATUS in line with security requirements.
 242  * In an attempt to avoid giving the whole game away when users
 243  * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
 244  * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
 245  * (session setups in particular).
 246  *
 247  * @param nt_status NTSTATUS input for squashing.
 248  * @return the 'squashed' nt_status
 249  **/
 250 _PUBLIC_ NTSTATUS auth_nt_status_squash(NTSTATUS nt_status)
 251 {
 252         if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
 253                 /* Match WinXP and don't give the game away */
 254                 return NT_STATUS_LOGON_FAILURE;
 255         } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
 256                 /* Match WinXP and don't give the game away */
 257                 return NT_STATUS_LOGON_FAILURE;
 258         }
 259
 260         return nt_status;
 261 }