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/*
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, &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;
}
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