source4/libnet/libnet_vampire.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Extract the user/system database from a remote SamSync server
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23
  24 #include "includes.h"
  25 #include "libnet/libnet.h"
  26 #include "libcli/auth/libcli_auth.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "auth/gensec/schannel_proto.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  32
  33
  34 /**
  35  * Decrypt and extract the user's passwords.
  36  *
  37  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
  38  */
  39 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  40                          struct creds_CredentialState *creds,
  41                          enum netr_SamDatabaseID database,
  42                          struct netr_DELTA_ENUM *delta,
  43                          char **error_string)
  44 {
  45
  46         uint32_t rid = delta->delta_id_union.rid;
  47         struct netr_DELTA_USER *user = delta->delta_union.user;
  48         struct samr_Password lm_hash;
  49         struct samr_Password nt_hash;
  50         const char *username = user->account_name.string;
  51         NTSTATUS nt_status;
  52
  53         if (lp_parm_bool(-1, "vampire", "rid_decrypt", True)) {
  54                 if (user->lm_password_present) {
  55                         sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
  56                         user->lmpassword = lm_hash;
  57                 }
  58
  59                 if (user->nt_password_present) {
  60                         sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
  61                         user->ntpassword = nt_hash;
  62                 }
  63         }
  64
  65         if (user->user_private_info.SensitiveData) {
  66                 DATA_BLOB data;
  67                 struct netr_USER_KEYS keys;
  68                 data.data = user->user_private_info.SensitiveData;
  69                 data.length = user->user_private_info.DataLength;
  70                 creds_arcfour_crypt(creds, data.data, data.length);
  71                 user->user_private_info.SensitiveData = data.data;
  72                 user->user_private_info.DataLength = data.length;
  73
  74                 nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  75                 if (NT_STATUS_IS_OK(nt_status)) {
  76                         if (keys.keys.keys2.lmpassword.length == 16) {
  77                                 if (lp_parm_bool(-1, "vampire", "rid decrypt", True)) {
  78                                         sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
  79                                         user->lmpassword = lm_hash;
  80                                 } else {
  81                                         user->lmpassword = keys.keys.keys2.lmpassword.pwd;
  82                                 }
  83                                 user->lm_password_present = True;
  84                         }
  85                         if (keys.keys.keys2.ntpassword.length == 16) {
  86                                 if (lp_parm_bool(-1, "vampire", "rid decrypt", True)) {
  87                                         sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
  88                                         user->ntpassword = nt_hash;
  89                                 } else {
  90                                         user->ntpassword = keys.keys.keys2.ntpassword.pwd;
  91                                 }
  92                                 user->nt_password_present = True;
  93                         }
  94                 } else {
  95                         *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:", username);
  96                         dump_data(10, data.data, data.length);
  97                         return nt_status;
  98                 }
  99         }
 100         return NT_STATUS_OK;
 101 }
 102
 103 /**
 104  * Decrypt and extract the secrets
 105  *
 106  * The writes decrypted secrets back into the structure
 107  */
 108 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
 109                            struct creds_CredentialState *creds,
 110                            enum netr_SamDatabaseID database,
 111                            struct netr_DELTA_ENUM *delta,
 112                            char **error_string)
 113 {
 114         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 115         creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
 116                             secret->current_cipher.maxlen);
 117
 118         creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
 119                             secret->old_cipher.maxlen);
 120
 121         return NT_STATUS_OK;
 122 }
 123
 124 /**
 125  * Fix up the delta, dealing with encryption issues so that the final
 126  * callback need only do the printing or application logic
 127  */
 128
 129 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
 130                           struct creds_CredentialState *creds,
 131                           enum netr_SamDatabaseID database,
 132                           struct netr_DELTA_ENUM *delta,
 133                           char **error_string)
 134 {
 135         NTSTATUS nt_status = NT_STATUS_OK;
 136         *error_string = NULL;
 137         switch (delta->delta_type) {
 138         case NETR_DELTA_USER:
 139         {
 140                 nt_status = fix_user(mem_ctx,
 141                                      creds,
 142                                      database,
 143                                      delta,
 144                                      error_string);
 145                 break;
 146         }
 147         case NETR_DELTA_SECRET:
 148         {
 149                 nt_status = fix_secret(mem_ctx,
 150                                        creds,
 151                                        database,
 152                                        delta,
 153                                        error_string);
 154                 break;
 155         }
 156         default:
 157                 break;
 158         }
 159         return nt_status;
 160 }
 161
 162 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
 163 {
 164         NTSTATUS nt_status, dbsync_nt_status;
 165         TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
 166         struct creds_CredentialState *creds;
 167         struct netr_DatabaseSync dbsync;
 168         struct cli_credentials *machine_account;
 169         struct dcerpc_pipe *p;
 170         struct libnet_context *machine_net_ctx;
 171         struct libnet_RpcConnect *c;
 172         struct libnet_SamSync_state *state;
 173         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
 174         int i;
 175
 176         samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
 177
 178         if (!r->in.machine_account) {
 179                 machine_account = cli_credentials_init(samsync_ctx);
 180                 if (!machine_account) {
 181                         talloc_free(samsync_ctx);
 182                         return NT_STATUS_NO_MEMORY;
 183                 }
 184                 cli_credentials_set_conf(machine_account);
 185                 nt_status = cli_credentials_set_machine_account(machine_account);
 186                 if (!NT_STATUS_IS_OK(nt_status)) {
 187                         r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
 188                         talloc_free(samsync_ctx);
 189                         return nt_status;
 190                 }
 191         } else {
 192                 machine_account = r->in.machine_account;
 193         }
 194
 195         /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
 196         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
 197                 r->out.error_string
 198                         = talloc_asprintf(mem_ctx,
 199                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
 200                                           cli_credentials_get_domain(machine_account),
 201                                           cli_credentials_get_secure_channel_type(machine_account));
 202                 talloc_free(samsync_ctx);
 203                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 204         }
 205
 206         c = talloc(samsync_ctx, struct libnet_RpcConnect);
 207         if (!c) {
 208                 r->out.error_string = NULL;
 209                 talloc_free(samsync_ctx);
 210                 return NT_STATUS_NO_MEMORY;
 211         }
 212
 213         c->level              = LIBNET_RPC_CONNECT_DC_INFO;
 214         if (r->in.binding_string) {
 215                 c->in.binding = r->in.binding_string;
 216                 c->in.name    = NULL;
 217         } else {
 218                 c->in.binding = NULL;
 219                 c->in.name    = cli_credentials_get_domain(machine_account);
 220         }
 221
 222         /* prepare connect to the NETLOGON pipe of PDC */
 223         c->in.dcerpc_iface      = &dcerpc_table_netlogon;
 224
 225         /* We must do this as the machine, not as any command-line
 226          * user.  So we override the credentials in the
 227          * libnet_context */
 228         machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
 229         if (!machine_net_ctx) {
 230                 r->out.error_string = NULL;
 231                 talloc_free(samsync_ctx);
 232                 return NT_STATUS_NO_MEMORY;
 233         }
 234         *machine_net_ctx = *ctx;
 235         machine_net_ctx->cred = machine_account;
 236
 237         /* connect to the NETLOGON pipe of the PDC */
 238         nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
 239         if (!NT_STATUS_IS_OK(nt_status)) {
 240                 if (r->in.binding_string) {
 241                         r->out.error_string = talloc_asprintf(mem_ctx,
 242                                                               "Connection to NETLOGON pipe of DC %s failed: %s",
 243                                                               r->in.binding_string, c->out.error_string);
 244                 } else {
 245                         r->out.error_string = talloc_asprintf(mem_ctx,
 246                                                               "Connection to NETLOGON pipe of DC for %s failed: %s",
 247                                                               c->in.name, c->out.error_string);
 248                 }
 249                 talloc_free(samsync_ctx);
 250                 return nt_status;
 251         }
 252
 253         /* This makes a new pipe, on which we can do schannel.  We
 254          * should do this in the RpcConnect code, but the abstaction
 255          * layers do not suit yet */
 256
 257         nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
 258                                                 c->out.dcerpc_pipe->binding);
 259
 260         if (!NT_STATUS_IS_OK(nt_status)) {
 261                 r->out.error_string = talloc_asprintf(mem_ctx,
 262                                                       "Secondary connection to NETLOGON pipe of DC %s failed: %s",
 263                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 264                 talloc_free(samsync_ctx);
 265                 return nt_status;
 266         }
 267
 268         nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &dcerpc_table_netlogon,
 269                                               machine_account, DCERPC_AUTH_LEVEL_PRIVACY);
 270
 271         if (!NT_STATUS_IS_OK(nt_status)) {
 272                 r->out.error_string = talloc_asprintf(mem_ctx,
 273                                                       "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
 274                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 275                 talloc_free(samsync_ctx);
 276                 return nt_status;
 277         }
 278
 279         state = talloc(samsync_ctx, struct libnet_SamSync_state);
 280         if (!state) {
 281                 r->out.error_string = NULL;
 282                 talloc_free(samsync_ctx);
 283                 return nt_status;
 284         }
 285
 286         state->domain_name     = c->out.domain_name;
 287         state->domain_sid      = c->out.domain_sid;
 288         state->realm           = c->out.realm;
 289         state->domain_guid     = c->out.guid;
 290         state->machine_net_ctx = machine_net_ctx;
 291         state->netlogon_pipe   = p;
 292
 293         /* initialise the callback layer.  It may wish to contact the
 294          * server with ldap, now we know the name */
 295
 296         if (r->in.init_fn) {
 297                 char *error_string;
 298                 nt_status = r->in.init_fn(samsync_ctx,
 299                                           r->in.fn_ctx,
 300                                           state,
 301                                           &error_string);
 302                 if (!NT_STATUS_IS_OK(nt_status)) {
 303                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 304                         talloc_free(samsync_ctx);
 305                         return nt_status;
 306                 }
 307         }
 308
 309         /* get NETLOGON credentails */
 310
 311         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
 312         if (!NT_STATUS_IS_OK(nt_status)) {
 313                 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 314                 talloc_free(samsync_ctx);
 315                 return nt_status;
 316         }
 317
 318         /* Setup details for the synchronisation */
 319         dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
 320         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 321         dbsync.in.preferredmaximumlength = (uint32_t)-1;
 322         ZERO_STRUCT(dbsync.in.return_authenticator);
 323
 324         for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 325                 dbsync.in.sync_context = 0;
 326                 dbsync.in.database_id = database_ids[i];
 327
 328                 do {
 329                         int d;
 330                         loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
 331                         creds_client_authenticator(creds, &dbsync.in.credential);
 332
 333                         dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
 334                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 335                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 336                                 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 337                                 talloc_free(samsync_ctx);
 338                                 return nt_status;
 339                         }
 340
 341                         if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
 342                                 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
 343                                 talloc_free(samsync_ctx);
 344                                 return NT_STATUS_ACCESS_DENIED;
 345                         }
 346
 347                         dbsync.in.sync_context = dbsync.out.sync_context;
 348
 349                         /* For every single remote 'delta' entry: */
 350                         for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
 351                                 char *error_string = NULL;
 352                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 353                                 /* 'Fix' elements, by decrypting and
 354                                  * de-obfuscating the data */
 355                                 nt_status = fix_delta(delta_ctx,
 356                                                       creds,
 357                                                       dbsync.in.database_id,
 358                                                       &dbsync.out.delta_enum_array->delta_enum[d],
 359                                                       &error_string);
 360                                 if (!NT_STATUS_IS_OK(nt_status)) {
 361                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 362                                         talloc_free(samsync_ctx);
 363                                         return nt_status;
 364                                 }
 365
 366                                 /* Now call the callback.  This will
 367                                  * do something like print the data or
 368                                  * write to an ldb */
 369                                 nt_status = r->in.delta_fn(delta_ctx,
 370                                                            r->in.fn_ctx,
 371                                                            dbsync.in.database_id,
 372                                                            &dbsync.out.delta_enum_array->delta_enum[d],
 373                                                            &error_string);
 374                                 if (!NT_STATUS_IS_OK(nt_status)) {
 375                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 376                                         talloc_free(samsync_ctx);
 377                                         return nt_status;
 378                                 }
 379                                 talloc_free(delta_ctx);
 380                         }
 381                         talloc_free(loop_ctx);
 382                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 383
 384                 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
 385                         r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
 386                         talloc_free(samsync_ctx);
 387                         return dbsync_nt_status;
 388                 }
 389                 nt_status = NT_STATUS_OK;
 390         }
 391         talloc_free(samsync_ctx);
 392         return nt_status;
 393 }
 394