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 "librpc/gen_ndr/ndr_netlogon.h"
  27 #include "librpc/gen_ndr/ndr_samr.h"
  28 #include "dlinklist.h"
  29
  30 struct samsync_secret {
  31         struct samsync_secret *prev, *next;
  32         DATA_BLOB secret;
  33         char *name;
  34         NTTIME mtime;
  35 };
  36
  37 struct samsync_trusted_domain {
  38         struct samsync_trusted_domain *prev, *next;
  39         struct dom_sid *sid;
  40         char *name;
  41 };
  42
  43 struct samdump_state {
  44         struct samsync_secret *secrets;
  45         struct samsync_trusted_domain *trusted_domains;
  46 };
  47
  48
  49 /**
  50  * Decrypt and extract the user's passwords.
  51  *
  52  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
  53  */
  54 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
  55                          struct creds_CredentialState *creds,
  56                          enum netr_SamDatabaseID database,
  57                          struct netr_DELTA_ENUM *delta,
  58                          char **error_string)
  59 {
  60
  61         uint32_t rid = delta->delta_id_union.rid;
  62         struct netr_DELTA_USER *user = delta->delta_union.user;
  63         struct samr_Password lm_hash;
  64         struct samr_Password nt_hash;
  65         const char *username = user->account_name.string;
  66         NTSTATUS nt_status;
  67
  68         if (user->lm_password_present) {
  69                 sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
  70                 user->lmpassword = lm_hash;
  71         }
  72
  73         if (user->nt_password_present) {
  74                 sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
  75                 user->ntpassword = nt_hash;
  76         }
  77
  78         if (user->user_private_info.SensitiveData) {
  79                 DATA_BLOB data;
  80                 struct netr_USER_KEYS keys;
  81                 data.data = user->user_private_info.SensitiveData;
  82                 data.length = user->user_private_info.DataLength;
  83                 creds_arcfour_crypt(creds, data.data, data.length);
  84                 user->user_private_info.SensitiveData = data.data;
  85                 user->user_private_info.DataLength = data.length;
  86
  87                 nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
  88                 if (NT_STATUS_IS_OK(nt_status)) {
  89                         if (keys.keys.keys2.lmpassword.length == 16) {
  90                                 sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
  91                                 user->lmpassword = lm_hash;
  92                                 user->lm_password_present = True;
  93                         }
  94                         if (keys.keys.keys2.ntpassword.length == 16) {
  95                                 sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
  96                                 user->ntpassword = nt_hash;
  97                                 user->nt_password_present = True;
  98                         }
  99                 } else {
 100                         *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:\n", username);
 101                         dump_data(10, data.data, data.length);
 102                         return nt_status;
 103                 }
 104         }
 105         return NT_STATUS_OK;
 106 }
 107
 108 /**
 109  * Decrypt and extract the secrets
 110  *
 111  * The writes decrypted secrets back into the structure
 112  */
 113 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
 114                            struct creds_CredentialState *creds,
 115                            enum netr_SamDatabaseID database,
 116                            struct netr_DELTA_ENUM *delta,
 117                            char **error_string)
 118 {
 119         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 120         creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
 121                             secret->current_cipher.maxlen);
 122
 123         creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
 124                             secret->old_cipher.maxlen);
 125
 126         return NT_STATUS_OK;
 127 }
 128
 129 /**
 130  * Fix up the delta, dealing with encryption issues so that the final
 131  * callback need only do the printing or application logic
 132  */
 133
 134 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
 135                           struct creds_CredentialState *creds,
 136                           enum netr_SamDatabaseID database,
 137                           struct netr_DELTA_ENUM *delta,
 138                           char **error_string)
 139 {
 140         NTSTATUS nt_status = NT_STATUS_OK;
 141         *error_string = NULL;
 142         switch (delta->delta_type) {
 143         case NETR_DELTA_USER:
 144         {
 145                 nt_status = fix_user(mem_ctx,
 146                                      creds,
 147                                      database,
 148                                      delta,
 149                                      error_string);
 150                 break;
 151         }
 152         case NETR_DELTA_SECRET:
 153         {
 154                 nt_status = fix_secret(mem_ctx,
 155                                        creds,
 156                                        database,
 157                                        delta,
 158                                        error_string);
 159                 break;
 160         }
 161         }
 162         return nt_status;
 163 }
 164
 165 static NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_SamSync *r)
 166 {
 167         NTSTATUS nt_status, dbsync_nt_status;
 168         TALLOC_CTX *loop_ctx, *delta_ctx;
 169         struct creds_CredentialState *creds;
 170         struct netr_DatabaseSync dbsync;
 171         struct cli_credentials *machine_account;
 172         struct dcerpc_binding *b;
 173         struct dcerpc_pipe *p;
 174         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
 175         int i;
 176
 177         /* TODO: This is bogus */
 178         const char **bindings = lp_passwordserver();
 179         const char *binding;
 180
 181         if (bindings && bindings[0]) {
 182                 binding = bindings[0];
 183         }
 184
 185         machine_account = cli_credentials_init(mem_ctx);
 186         if (!machine_account) {
 187                 return NT_STATUS_NO_MEMORY;
 188         }
 189
 190         cli_credentials_set_conf(machine_account);
 191         nt_status = cli_credentials_set_machine_account(machine_account);
 192
 193         if (!NT_STATUS_IS_OK(nt_status)) {
 194                 r->netlogon.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
 195                 return nt_status;
 196         }
 197
 198         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
 199                 r->netlogon.error_string
 200                         = talloc_asprintf(mem_ctx,
 201                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
 202
 203                                           cli_credentials_get_domain(machine_account),
 204                                           cli_credentials_get_secure_channel_type(machine_account));
 205                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 206         }
 207
 208         /* Connect to DC (take a binding string for now) */
 209
 210         nt_status = dcerpc_parse_binding(mem_ctx, binding, &b);
 211         if (!NT_STATUS_IS_OK(nt_status)) {
 212                 r->netlogon.error_string = talloc_asprintf(mem_ctx, "Bad binding string %s\n", binding);
 213                 return NT_STATUS_INVALID_PARAMETER;
 214         }
 215
 216         /* We like schannel */
 217         b->flags &= ~DCERPC_AUTH_OPTIONS;
 218         b->flags |= DCERPC_SCHANNEL | DCERPC_SEAL /* | DCERPC_SCHANNEL_128 */;
 219
 220         /* Setup schannel */
 221         nt_status = dcerpc_pipe_connect_b(mem_ctx, &p, b,
 222                                           DCERPC_NETLOGON_UUID,
 223                                           DCERPC_NETLOGON_VERSION,
 224                                           machine_account);
 225
 226         if (!NT_STATUS_IS_OK(nt_status)) {
 227                 return nt_status;
 228         }
 229
 230         /* get NETLOGON credentails */
 231
 232         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, mem_ctx, &creds);
 233         if (!NT_STATUS_IS_OK(nt_status)) {
 234                 r->netlogon.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 235                 return nt_status;
 236         }
 237
 238         dbsync.in.logon_server = talloc_asprintf(mem_ctx, "\\\\%s", dcerpc_server_name(p));
 239         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 240         dbsync.in.preferredmaximumlength = (uint32_t)-1;
 241         ZERO_STRUCT(dbsync.in.return_authenticator);
 242
 243         for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 244                 dbsync.in.sync_context = 0;
 245                 dbsync.in.database_id = database_ids[i];
 246
 247                 do {
 248                         int d;
 249                         loop_ctx = talloc_named(mem_ctx, 0, "DatabaseSync loop context");
 250                         creds_client_authenticator(creds, &dbsync.in.credential);
 251
 252                         dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
 253                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 254                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 255                                 r->netlogon.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 256                                 return nt_status;
 257                         }
 258
 259                         if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
 260                                 r->netlogon.error_string = talloc_strdup(mem_ctx, "Credential chaining failed");
 261                                 return NT_STATUS_ACCESS_DENIED;
 262                         }
 263
 264                         dbsync.in.sync_context = dbsync.out.sync_context;
 265
 266                         for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
 267                                 char *error_string = NULL;
 268                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 269                                 nt_status = fix_delta(delta_ctx,
 270                                                       creds,
 271                                                       dbsync.in.database_id,
 272                                                       &dbsync.out.delta_enum_array->delta_enum[d],
 273                                                       &error_string);
 274                                 if (!NT_STATUS_IS_OK(nt_status)) {
 275                                         r->netlogon.error_string = talloc_steal(mem_ctx, error_string);
 276                                         talloc_free(delta_ctx);
 277                                         return nt_status;
 278                                 }
 279                                 nt_status = r->netlogon.delta_fn(delta_ctx,
 280                                                                  r->netlogon.fn_ctx,
 281                                                                  creds,
 282                                                                  dbsync.in.database_id,
 283                                                                  &dbsync.out.delta_enum_array->delta_enum[d],
 284                                                                  &error_string);
 285                                 if (!NT_STATUS_IS_OK(nt_status)) {
 286                                         r->netlogon.error_string = talloc_steal(mem_ctx, error_string);
 287                                         talloc_free(delta_ctx);
 288                                         return nt_status;
 289                                 }
 290                                 talloc_free(delta_ctx);
 291                         }
 292                         talloc_free(loop_ctx);
 293                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 294                 nt_status = dbsync_nt_status;
 295         }
 296         return nt_status;
 297 }
 298
 299 static NTSTATUS vampire_samdump_handle_user(TALLOC_CTX *mem_ctx,
 300                                             struct creds_CredentialState *creds,
 301                                             struct netr_DELTA_ENUM *delta)
 302 {
 303         uint32_t rid = delta->delta_id_union.rid;
 304         struct netr_DELTA_USER *user = delta->delta_union.user;
 305         const char *username = user->account_name.string;
 306         char *hex_lm_password;
 307         char *hex_nt_password;
 308
 309         hex_lm_password = smbpasswd_sethexpwd(mem_ctx,
 310                                               user->lm_password_present ? &user->lmpassword : NULL,
 311                                               user->acct_flags);
 312         hex_nt_password = smbpasswd_sethexpwd(mem_ctx,
 313                                               user->nt_password_present ? &user->ntpassword : NULL,
 314                                               user->acct_flags);
 315
 316         printf("%s:%d:%s:%s:%s:LCT-%08X\n", username,
 317                rid, hex_lm_password, hex_nt_password,
 318                smbpasswd_encode_acb_info(mem_ctx, user->acct_flags),
 319                (unsigned int)nt_time_to_unix(user->last_password_change));
 320
 321         return NT_STATUS_OK;
 322 }
 323
 324 static NTSTATUS vampire_samdump_handle_secret(TALLOC_CTX *mem_ctx,
 325                                               struct samdump_state *samdump_state,
 326                                               struct creds_CredentialState *creds,
 327                                               struct netr_DELTA_ENUM *delta)
 328 {
 329         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
 330         const char *name = delta->delta_id_union.name;
 331         struct samsync_secret *new = talloc(samdump_state, struct samsync_secret);
 332
 333         new->name = talloc_reference(new, name);
 334         new->secret = data_blob_talloc(new, secret->current_cipher.cipher_data, secret->current_cipher.maxlen);
 335         new->mtime = secret->current_cipher_set_time;
 336
 337         DLIST_ADD(samdump_state->secrets, new);
 338
 339         return NT_STATUS_OK;
 340 }
 341
 342 static NTSTATUS vampire_samdump_handle_trusted_domain(TALLOC_CTX *mem_ctx,
 343                                               struct samdump_state *samdump_state,
 344                                               struct creds_CredentialState *creds,
 345                                               struct netr_DELTA_ENUM *delta)
 346 {
 347         struct netr_DELTA_TRUSTED_DOMAIN *trusted_domain = delta->delta_union.trusted_domain;
 348         struct dom_sid *dom_sid = delta->delta_id_union.sid;
 349
 350         struct samsync_trusted_domain *new = talloc(samdump_state, struct samsync_trusted_domain);
 351
 352         new->name = talloc_reference(new, trusted_domain->domain_name.string);
 353         new->sid = talloc_reference(new, dom_sid);
 354
 355         DLIST_ADD(samdump_state->trusted_domains, new);
 356
 357         return NT_STATUS_OK;
 358 }
 359
 360 static NTSTATUS libnet_samdump_fn(TALLOC_CTX *mem_ctx,
 361                                   void *private,
 362                                   struct creds_CredentialState *creds,
 363                                   enum netr_SamDatabaseID database,
 364                                   struct netr_DELTA_ENUM *delta,
 365                                   char **error_string)
 366 {
 367         NTSTATUS nt_status = NT_STATUS_OK;
 368         struct samdump_state *samdump_state = private;
 369
 370         *error_string = NULL;
 371         switch (delta->delta_type) {
 372         case NETR_DELTA_USER:
 373         {
 374                 /* not interested in builtin users */
 375                 if (database == SAM_DATABASE_DOMAIN) {
 376                         nt_status = vampire_samdump_handle_user(mem_ctx,
 377                                                                 creds,
 378                                                                 delta);
 379                         break;
 380                 }
 381         }
 382         case NETR_DELTA_SECRET:
 383         {
 384                 nt_status = vampire_samdump_handle_secret(mem_ctx,
 385                                                           samdump_state,
 386                                                           creds,
 387                                                           delta);
 388                 break;
 389         }
 390         case NETR_DELTA_TRUSTED_DOMAIN:
 391         {
 392                 nt_status = vampire_samdump_handle_trusted_domain(mem_ctx,
 393                                                                   samdump_state,
 394                                                                   creds,
 395                                                                   delta);
 396                 break;
 397         }
 398         }
 399         return nt_status;
 400 }
 401
 402 NTSTATUS libnet_SamDump_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_SamDump *r)
 403 {
 404         NTSTATUS nt_status;
 405         union libnet_SamSync r2;
 406         struct samdump_state *samdump_state = talloc(mem_ctx, struct samdump_state);
 407
 408         struct samsync_trusted_domain *t;
 409         struct samsync_secret *s;
 410
 411         if (!samdump_state) {
 412                 return NT_STATUS_NO_MEMORY;
 413         }
 414
 415         samdump_state->secrets = NULL;
 416         samdump_state->trusted_domains = NULL;
 417
 418         r2.netlogon.level = LIBNET_SAMDUMP_NETLOGON;
 419         r2.netlogon.error_string = NULL;
 420         r2.netlogon.delta_fn = libnet_samdump_fn;
 421         r2.netlogon.fn_ctx = samdump_state;
 422         nt_status = libnet_SamSync_netlogon(ctx, mem_ctx, &r2);
 423         r->generic.error_string = r2.netlogon.error_string;
 424
 425         if (!NT_STATUS_IS_OK(nt_status)) {
 426                 return nt_status;
 427         }
 428
 429         printf("Trusted domains, sids and secrets:\n");
 430         for (t=samdump_state->trusted_domains; t; t=t->next) {
 431                 char *secret_name = talloc_asprintf(mem_ctx, "G$$%s", t->name);
 432                 for (s=samdump_state->secrets; s; s=s->next) {
 433                         if (StrCaseCmp(s->name, secret_name) == 0) {
 434                                 char *secret_string;
 435                                 if (convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
 436                                                           s->secret.data, s->secret.length,
 437                                                           (void **)&secret_string) == -1) {
 438                                         r->generic.error_string = talloc_asprintf(mem_ctx,
 439                                                                                   "Could not convert secret for domain %s to a string\n",
 440                                                                                   t->name);
 441                                         return NT_STATUS_INVALID_PARAMETER;
 442                                 }
 443                                 printf("%s\t%s\t%s\n",
 444                                        t->name, dom_sid_string(mem_ctx, t->sid),
 445                                        secret_string);
 446                         }
 447                 }
 448         }
 449         return nt_status;
 450 }
 451
 452
 453
 454 NTSTATUS libnet_SamDump_generic(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_SamDump *r)
 455 {
 456         NTSTATUS nt_status;
 457         union libnet_SamDump r2;
 458         r2.generic.level = LIBNET_SAMDUMP_NETLOGON;
 459         r2.generic.error_string = NULL;
 460         nt_status = libnet_SamDump(ctx, mem_ctx, &r2);
 461         r->generic.error_string = r2.netlogon.error_string;
 462
 463
 464         return nt_status;
 465 }
 466
 467 NTSTATUS libnet_SamDump(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_SamDump *r)
 468 {
 469         switch (r->generic.level) {
 470         case LIBNET_SAMDUMP_GENERIC:
 471                 return libnet_SamDump_generic(ctx, mem_ctx, r);
 472         case LIBNET_SAMDUMP_NETLOGON:
 473                 return libnet_SamDump_netlogon(ctx, mem_ctx, r);
 474         }
 475
 476         return NT_STATUS_INVALID_LEVEL;
 477 }