source4/libnet/libnet_samsync.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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22
  23 #include "includes.h"
  24 #include "libnet/libnet.h"
  25 #include "libcli/auth/libcli_auth.h"
  26 #include "../libcli/samsync/samsync.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "libcli/auth/schannel.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  32 #include "param/param.h"
  33
  34 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
  35 {
  36         NTSTATUS nt_status, dbsync_nt_status;
  37         TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
  38         struct netlogon_creds_CredentialState *creds;
  39         struct netr_DatabaseSync dbsync;
  40         struct netr_Authenticator credential, return_authenticator;
  41         struct netr_DELTA_ENUM_ARRAY *delta_enum_array = NULL;
  42         struct cli_credentials *machine_account;
  43         struct dcerpc_pipe *p;
  44         struct libnet_context *machine_net_ctx;
  45         struct libnet_RpcConnect *c;
  46         struct libnet_SamSync_state *state;
  47         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
  48         unsigned int i;
  49
  50         samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
  51
  52         if (!r->in.machine_account) {
  53                 machine_account = cli_credentials_init(samsync_ctx);
  54                 if (!machine_account) {
  55                         talloc_free(samsync_ctx);
  56                         return NT_STATUS_NO_MEMORY;
  57                 }
  58                 cli_credentials_set_conf(machine_account, ctx->lp_ctx);
  59                 nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx);
  60                 if (!NT_STATUS_IS_OK(nt_status)) {
  61                         r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
  62                         talloc_free(samsync_ctx);
  63                         return nt_status;
  64                 }
  65         } else {
  66                 machine_account = r->in.machine_account;
  67         }
  68
  69         /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
  70         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
  71                 r->out.error_string
  72                         = talloc_asprintf(mem_ctx,
  73                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
  74                                           cli_credentials_get_domain(machine_account),
  75                                           cli_credentials_get_secure_channel_type(machine_account));
  76                 talloc_free(samsync_ctx);
  77                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
  78         }
  79
  80         c = talloc_zero(samsync_ctx, struct libnet_RpcConnect);
  81         if (!c) {
  82                 r->out.error_string = NULL;
  83                 talloc_free(samsync_ctx);
  84                 return NT_STATUS_NO_MEMORY;
  85         }
  86
  87         c->level              = LIBNET_RPC_CONNECT_DC_INFO;
  88         if (r->in.binding_string) {
  89                 c->in.binding = r->in.binding_string;
  90                 c->in.name    = NULL;
  91         } else {
  92                 c->in.binding = NULL;
  93                 c->in.name    = cli_credentials_get_domain(machine_account);
  94         }
  95
  96         /* prepare connect to the NETLOGON pipe of PDC */
  97         c->in.dcerpc_iface      = &ndr_table_netlogon;
  98
  99         /* We must do this as the machine, not as any command-line
 100          * user.  So we override the credentials in the
 101          * libnet_context */
 102         machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
 103         if (!machine_net_ctx) {
 104                 r->out.error_string = NULL;
 105                 talloc_free(samsync_ctx);
 106                 return NT_STATUS_NO_MEMORY;
 107         }
 108         *machine_net_ctx = *ctx;
 109         machine_net_ctx->cred = machine_account;
 110
 111         /* connect to the NETLOGON pipe of the PDC */
 112         nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
 113         if (!NT_STATUS_IS_OK(nt_status)) {
 114                 if (r->in.binding_string) {
 115                         r->out.error_string = talloc_asprintf(mem_ctx,
 116                                                               "Connection to NETLOGON pipe of DC %s failed: %s",
 117                                                               r->in.binding_string, c->out.error_string);
 118                 } else {
 119                         r->out.error_string = talloc_asprintf(mem_ctx,
 120                                                               "Connection to NETLOGON pipe of DC for %s failed: %s",
 121                                                               c->in.name, c->out.error_string);
 122                 }
 123                 talloc_free(samsync_ctx);
 124                 return nt_status;
 125         }
 126
 127         /* This makes a new pipe, on which we can do schannel.  We
 128          * should do this in the RpcConnect code, but the abstaction
 129          * layers do not suit yet */
 130
 131         nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
 132                                                 c->out.dcerpc_pipe->binding);
 133
 134         if (!NT_STATUS_IS_OK(nt_status)) {
 135                 r->out.error_string = talloc_asprintf(mem_ctx,
 136                                                       "Secondary connection to NETLOGON pipe of DC %s failed: %s",
 137                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 138                 talloc_free(samsync_ctx);
 139                 return nt_status;
 140         }
 141
 142         nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon,
 143                                               machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY);
 144
 145         if (!NT_STATUS_IS_OK(nt_status)) {
 146                 r->out.error_string = talloc_asprintf(mem_ctx,
 147                                                       "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
 148                                                       dcerpc_server_name(p), nt_errstr(nt_status));
 149                 talloc_free(samsync_ctx);
 150                 return nt_status;
 151         }
 152
 153         state = talloc(samsync_ctx, struct libnet_SamSync_state);
 154         if (!state) {
 155                 r->out.error_string = NULL;
 156                 talloc_free(samsync_ctx);
 157                 return nt_status;
 158         }
 159
 160         state->domain_name     = c->out.domain_name;
 161         state->domain_sid      = c->out.domain_sid;
 162         state->realm           = c->out.realm;
 163         state->domain_guid     = c->out.guid;
 164         state->machine_net_ctx = machine_net_ctx;
 165         state->netlogon_pipe   = p;
 166
 167         /* initialise the callback layer.  It may wish to contact the
 168          * server with ldap, now we know the name */
 169
 170         if (r->in.init_fn) {
 171                 char *error_string;
 172                 nt_status = r->in.init_fn(samsync_ctx,
 173                                           r->in.fn_ctx,
 174                                           state,
 175                                           &error_string);
 176                 if (!NT_STATUS_IS_OK(nt_status)) {
 177                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 178                         talloc_free(samsync_ctx);
 179                         return nt_status;
 180                 }
 181         }
 182
 183         /* get NETLOGON credentials */
 184
 185         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
 186         if (!NT_STATUS_IS_OK(nt_status)) {
 187                 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 188                 talloc_free(samsync_ctx);
 189                 return nt_status;
 190         }
 191
 192         /* Setup details for the synchronisation */
 193
 194         ZERO_STRUCT(return_authenticator);
 195
 196         dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
 197         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 198         dbsync.in.preferredmaximumlength = (uint32_t)-1;
 199         dbsync.in.return_authenticator = &return_authenticator;
 200         dbsync.out.return_authenticator = &return_authenticator;
 201         dbsync.out.delta_enum_array = &delta_enum_array;
 202
 203         for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 204
 205                 uint32_t sync_context = 0;
 206
 207                 dbsync.in.database_id = database_ids[i];
 208                 dbsync.in.sync_context = &sync_context;
 209                 dbsync.out.sync_context = &sync_context;
 210
 211                 do {
 212                         uint32_t d;
 213                         loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
 214                         netlogon_creds_client_authenticator(creds, &credential);
 215
 216                         dbsync.in.credential = &credential;
 217
 218                         dbsync_nt_status = dcerpc_netr_DatabaseSync_r(p->binding_handle, loop_ctx, &dbsync);
 219                         if (NT_STATUS_IS_OK(dbsync_nt_status) && !NT_STATUS_IS_OK(dbsync.out.result)) {
 220                                 dbsync_nt_status = dbsync.out.result;
 221                         }
 222                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 223                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 224                                 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 225                                 talloc_free(samsync_ctx);
 226                                 return nt_status;
 227                         }
 228
 229                         if (!netlogon_creds_client_check(creds, &dbsync.out.return_authenticator->cred)) {
 230                                 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
 231                                 talloc_free(samsync_ctx);
 232                                 return NT_STATUS_ACCESS_DENIED;
 233                         }
 234
 235                         dbsync.in.sync_context = dbsync.out.sync_context;
 236
 237                         /* For every single remote 'delta' entry: */
 238                         for (d=0; d < delta_enum_array->num_deltas; d++) {
 239                                 char *error_string = NULL;
 240                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 241                                 /* 'Fix' elements, by decrypting and
 242                                  * de-obfuscating the data */
 243                                 nt_status = samsync_fix_delta(delta_ctx,
 244                                                               creds,
 245                                                               dbsync.in.database_id,
 246                                                               &delta_enum_array->delta_enum[d]);
 247                                 if (!NT_STATUS_IS_OK(nt_status)) {
 248                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 249                                         talloc_free(samsync_ctx);
 250                                         return nt_status;
 251                                 }
 252
 253                                 /* Now call the callback.  This will
 254                                  * do something like print the data or
 255                                  * write to an ldb */
 256                                 nt_status = r->in.delta_fn(delta_ctx,
 257                                                            r->in.fn_ctx,
 258                                                            dbsync.in.database_id,
 259                                                            &delta_enum_array->delta_enum[d],
 260                                                            &error_string);
 261                                 if (!NT_STATUS_IS_OK(nt_status)) {
 262                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
 263                                         talloc_free(samsync_ctx);
 264                                         return nt_status;
 265                                 }
 266                                 talloc_free(delta_ctx);
 267                         }
 268                         talloc_free(loop_ctx);
 269                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 270
 271                 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
 272                         r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
 273                         talloc_free(samsync_ctx);
 274                         return dbsync_nt_status;
 275                 }
 276                 nt_status = NT_STATUS_OK;
 277         }
 278         talloc_free(samsync_ctx);
 279         return nt_status;
 280 }
 281