/* Unix SMB/CIFS implementation. Extract the user/system database from a remote SamSync server Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005 Copyright (C) Guenther Deschner <gd@samba.org> 2008 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 "../lib/crypto/crypto.h" #include "../libcli/auth/libcli_auth.h" #include "../libcli/samsync/samsync.h" #include "librpc/gen_ndr/ndr_netlogon.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 netlogon_creds_CredentialState *creds, enum netr_SamDatabaseID database_id, struct netr_DELTA_ENUM *delta) { 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; unsigned char zero_buf[16]; memset(zero_buf, '\0', sizeof(zero_buf)); /* Note that win2000 may send us all zeros * for the hashes if it doesn't * think this channel is secure enough. */ if (user->lm_password_present) { if (memcmp(user->lmpassword.hash, zero_buf, 16) != 0) { sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0); } else { memset(lm_hash.hash, '\0', sizeof(lm_hash.hash)); } user->lmpassword = lm_hash; } if (user->nt_password_present) { if (memcmp(user->ntpassword.hash, zero_buf, 16) != 0) { sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0); } else { memset(nt_hash.hash, '\0', sizeof(nt_hash.hash)); } 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; netlogon_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)) { dump_data(10, data.data, data.length); return ndr_map_error2ntstatus(ndr_err); } /* Note that win2000 may send us all zeros * for the hashes if it doesn't * think this channel is secure enough. */ if (keys.keys.keys2.lmpassword.length == 16) { if (memcmp(keys.keys.keys2.lmpassword.pwd.hash, zero_buf, 16) != 0) { sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0); } else { memset(lm_hash.hash, '\0', sizeof(lm_hash.hash)); } user->lmpassword = lm_hash; user->lm_password_present = true; } if (keys.keys.keys2.ntpassword.length == 16) { if (memcmp(keys.keys.keys2.ntpassword.pwd.hash, zero_buf, 16) != 0) { sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0); } else { memset(nt_hash.hash, '\0', sizeof(nt_hash.hash)); } user->ntpassword = nt_hash; 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 netlogon_creds_CredentialState *creds, enum netr_SamDatabaseID database, struct netr_DELTA_ENUM *delta) { struct netr_DELTA_SECRET *secret = delta->delta_union.secret; netlogon_creds_arcfour_crypt(creds, secret->current_cipher.cipher_data, secret->current_cipher.maxlen); netlogon_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 */ NTSTATUS samsync_fix_delta(TALLOC_CTX *mem_ctx, struct netlogon_creds_CredentialState *creds, enum netr_SamDatabaseID database_id, struct netr_DELTA_ENUM *delta) { NTSTATUS status = NT_STATUS_OK; switch (delta->delta_type) { case NETR_DELTA_USER: status = fix_user(mem_ctx, creds, database_id, delta); break; case NETR_DELTA_SECRET: status = fix_secret(mem_ctx, creds, database_id, delta); break; default: break; } return status; }