diff options
Diffstat (limited to 'source4/libnet/libnet_samsync.c')
| -rw-r--r-- | source4/libnet/libnet_samsync.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/source4/libnet/libnet_samsync.c b/source4/libnet/libnet_samsync.c new file mode 100644 index 0000000000..0f82d98673 --- /dev/null +++ b/source4/libnet/libnet_samsync.c @@ -0,0 +1,399 @@ +/* + Unix SMB/CIFS implementation. + + Extract the user/system database from a remote SamSync server + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + + +#include "includes.h" +#include "libnet/libnet.h" +#include "libcli/auth/libcli_auth.h" +#include "auth/gensec/gensec.h" +#include "auth/credentials/credentials.h" +#include "auth/gensec/schannel_proto.h" +#include "librpc/gen_ndr/ndr_netlogon.h" +#include "librpc/gen_ndr/ndr_netlogon_c.h" +#include "param/param.h" + + +/** + * Decrypt and extract the user's passwords. + * + * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure + */ +static NTSTATUS fix_user(TALLOC_CTX *mem_ctx, + struct creds_CredentialState *creds, + bool rid_crypt, + enum netr_SamDatabaseID database, + struct netr_DELTA_ENUM *delta, + char **error_string) +{ + + uint32_t rid = delta->delta_id_union.rid; + struct netr_DELTA_USER *user = delta->delta_union.user; + struct samr_Password lm_hash; + struct samr_Password nt_hash; + const char *username = user->account_name.string; + + if (rid_crypt) { + if (user->lm_password_present) { + sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0); + user->lmpassword = lm_hash; + } + + if (user->nt_password_present) { + sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0); + user->ntpassword = nt_hash; + } + } + + if (user->user_private_info.SensitiveData) { + DATA_BLOB data; + struct netr_USER_KEYS keys; + enum ndr_err_code ndr_err; + data.data = user->user_private_info.SensitiveData; + data.length = user->user_private_info.DataLength; + creds_arcfour_crypt(creds, data.data, data.length); + user->user_private_info.SensitiveData = data.data; + user->user_private_info.DataLength = data.length; + + ndr_err = ndr_pull_struct_blob(&data, mem_ctx, NULL, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:", username); + dump_data(10, data.data, data.length); + return ndr_map_error2ntstatus(ndr_err); + } + + if (keys.keys.keys2.lmpassword.length == 16) { + if (rid_crypt) { + sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0); + user->lmpassword = lm_hash; + } else { + user->lmpassword = keys.keys.keys2.lmpassword.pwd; + } + user->lm_password_present = true; + } + if (keys.keys.keys2.ntpassword.length == 16) { + if (rid_crypt) { + sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0); + user->ntpassword = nt_hash; + } else { + user->ntpassword = keys.keys.keys2.ntpassword.pwd; + } + user->nt_password_present = true; + } + /* TODO: rid decrypt history fields */ + } + return NT_STATUS_OK; +} + +/** + * Decrypt and extract the secrets + * + * The writes decrypted secrets back into the structure + */ +static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx, + struct creds_CredentialState *creds, + enum netr_SamDatabaseID database, + struct netr_DELTA_ENUM *delta, + char **error_string) +{ + struct netr_DELTA_SECRET *secret = delta->delta_union.secret; + creds_arcfour_crypt(creds, secret->current_cipher.cipher_data, + secret->current_cipher.maxlen); + + creds_arcfour_crypt(creds, secret->old_cipher.cipher_data, + secret->old_cipher.maxlen); + + return NT_STATUS_OK; +} + +/** + * Fix up the delta, dealing with encryption issues so that the final + * callback need only do the printing or application logic + */ + +static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx, + struct creds_CredentialState *creds, + bool rid_crypt, + enum netr_SamDatabaseID database, + struct netr_DELTA_ENUM *delta, + char **error_string) +{ + NTSTATUS nt_status = NT_STATUS_OK; + *error_string = NULL; + switch (delta->delta_type) { + case NETR_DELTA_USER: + { + nt_status = fix_user(mem_ctx, + creds, + rid_crypt, + database, + delta, + error_string); + break; + } + case NETR_DELTA_SECRET: + { + nt_status = fix_secret(mem_ctx, + creds, + database, + delta, + error_string); + break; + } + default: + break; + } + return nt_status; +} + +NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r) +{ + NTSTATUS nt_status, dbsync_nt_status; + TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx; + struct creds_CredentialState *creds; + struct netr_DatabaseSync dbsync; + struct cli_credentials *machine_account; + struct dcerpc_pipe *p; + struct libnet_context *machine_net_ctx; + struct libnet_RpcConnect *c; + struct libnet_SamSync_state *state; + const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS}; + int i; + + samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context"); + + if (!r->in.machine_account) { + machine_account = cli_credentials_init(samsync_ctx); + if (!machine_account) { + talloc_free(samsync_ctx); + return NT_STATUS_NO_MEMORY; + } + cli_credentials_set_conf(machine_account, ctx->lp_ctx); + nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx); + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?"); + talloc_free(samsync_ctx); + return nt_status; + } + } else { + machine_account = r->in.machine_account; + } + + /* We cannot do this unless we are a BDC. Check, before we get odd errors later */ + if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) { + r->out.error_string + = talloc_asprintf(mem_ctx, + "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC", + cli_credentials_get_domain(machine_account), + cli_credentials_get_secure_channel_type(machine_account)); + talloc_free(samsync_ctx); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } + + c = talloc(samsync_ctx, struct libnet_RpcConnect); + if (!c) { + r->out.error_string = NULL; + talloc_free(samsync_ctx); + return NT_STATUS_NO_MEMORY; + } + + c->level = LIBNET_RPC_CONNECT_DC_INFO; + if (r->in.binding_string) { + c->in.binding = r->in.binding_string; + c->in.name = NULL; + } else { + c->in.binding = NULL; + c->in.name = cli_credentials_get_domain(machine_account); + } + + /* prepare connect to the NETLOGON pipe of PDC */ + c->in.dcerpc_iface = &ndr_table_netlogon; + + /* We must do this as the machine, not as any command-line + * user. So we override the credentials in the + * libnet_context */ + machine_net_ctx = talloc(samsync_ctx, struct libnet_context); + if (!machine_net_ctx) { + r->out.error_string = NULL; + talloc_free(samsync_ctx); + return NT_STATUS_NO_MEMORY; + } + *machine_net_ctx = *ctx; + machine_net_ctx->cred = machine_account; + + /* connect to the NETLOGON pipe of the PDC */ + nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c); + if (!NT_STATUS_IS_OK(nt_status)) { + if (r->in.binding_string) { + r->out.error_string = talloc_asprintf(mem_ctx, + "Connection to NETLOGON pipe of DC %s failed: %s", + r->in.binding_string, c->out.error_string); + } else { + r->out.error_string = talloc_asprintf(mem_ctx, + "Connection to NETLOGON pipe of DC for %s failed: %s", + c->in.name, c->out.error_string); + } + talloc_free(samsync_ctx); + return nt_status; + } + + /* This makes a new pipe, on which we can do schannel. We + * should do this in the RpcConnect code, but the abstaction + * layers do not suit yet */ + + nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p, + c->out.dcerpc_pipe->binding); + + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_asprintf(mem_ctx, + "Secondary connection to NETLOGON pipe of DC %s failed: %s", + dcerpc_server_name(p), nt_errstr(nt_status)); + talloc_free(samsync_ctx); + return nt_status; + } + + nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon, + machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY); + + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_asprintf(mem_ctx, + "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s", + dcerpc_server_name(p), nt_errstr(nt_status)); + talloc_free(samsync_ctx); + return nt_status; + } + + state = talloc(samsync_ctx, struct libnet_SamSync_state); + if (!state) { + r->out.error_string = NULL; + talloc_free(samsync_ctx); + return nt_status; + } + + state->domain_name = c->out.domain_name; + state->domain_sid = c->out.domain_sid; + state->realm = c->out.realm; + state->domain_guid = c->out.guid; + state->machine_net_ctx = machine_net_ctx; + state->netlogon_pipe = p; + + /* initialise the callback layer. It may wish to contact the + * server with ldap, now we know the name */ + + if (r->in.init_fn) { + char *error_string; + nt_status = r->in.init_fn(samsync_ctx, + r->in.fn_ctx, + state, + &error_string); + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_steal(mem_ctx, error_string); + talloc_free(samsync_ctx); + return nt_status; + } + } + + /* get NETLOGON credentials */ + + nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds); + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer"); + talloc_free(samsync_ctx); + return nt_status; + } + + /* Setup details for the synchronisation */ + dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p)); + dbsync.in.computername = cli_credentials_get_workstation(machine_account); + dbsync.in.preferredmaximumlength = (uint32_t)-1; + ZERO_STRUCT(dbsync.in.return_authenticator); + + for (i=0;i< ARRAY_SIZE(database_ids); i++) { + dbsync.in.sync_context = 0; + dbsync.in.database_id = database_ids[i]; + + do { + int d; + loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context"); + creds_client_authenticator(creds, &dbsync.in.credential); + + dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync); + if (!NT_STATUS_IS_OK(dbsync_nt_status) && + !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) { + r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status)); + talloc_free(samsync_ctx); + return nt_status; + } + + if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) { + r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed"); + talloc_free(samsync_ctx); + return NT_STATUS_ACCESS_DENIED; + } + + dbsync.in.sync_context = dbsync.out.sync_context; + + /* For every single remote 'delta' entry: */ + for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) { + char *error_string = NULL; + delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context"); + /* 'Fix' elements, by decrypting and + * de-obfuscating the data */ + nt_status = fix_delta(delta_ctx, + creds, + r->in.rid_crypt, + dbsync.in.database_id, + &dbsync.out.delta_enum_array->delta_enum[d], + &error_string); + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_steal(mem_ctx, error_string); + talloc_free(samsync_ctx); + return nt_status; + } + + /* Now call the callback. This will + * do something like print the data or + * write to an ldb */ + nt_status = r->in.delta_fn(delta_ctx, + r->in.fn_ctx, + dbsync.in.database_id, + &dbsync.out.delta_enum_array->delta_enum[d], + &error_string); + if (!NT_STATUS_IS_OK(nt_status)) { + r->out.error_string = talloc_steal(mem_ctx, error_string); + talloc_free(samsync_ctx); + return nt_status; + } + talloc_free(delta_ctx); + } + talloc_free(loop_ctx); + } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)); + + if (!NT_STATUS_IS_OK(dbsync_nt_status)) { + r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status)); + talloc_free(samsync_ctx); + return dbsync_nt_status; + } + nt_status = NT_STATUS_OK; + } + talloc_free(samsync_ctx); + return nt_status; +} + |