diff options
Diffstat (limited to 'libcli/samsync/decrypt.c')
| -rw-r--r-- | libcli/samsync/decrypt.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/libcli/samsync/decrypt.c b/libcli/samsync/decrypt.c new file mode 100644 index 0000000..77ef932 --- /dev/null +++ b/libcli/samsync/decrypt.c @@ -0,0 +1,209 @@ +/* + 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 "../libcli/auth/libcli_auth.h" +#include "../libcli/samsync/samsync.h" +#include "librpc/gen_ndr/ndr_netlogon.h" +#include "lib/crypto/gnutls_helpers.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; + int rc; + + /* 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 (!all_zero(user->lmpassword.hash, 16)) { + rc = sam_rid_crypt(rid, user->lmpassword.hash, + lm_hash.hash, SAMBA_GNUTLS_DECRYPT); + if (rc != 0) { + return gnutls_error_to_ntstatus(rc, + NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER); + } + } else { + memset(lm_hash.hash, '\0', sizeof(lm_hash.hash)); + } + user->lmpassword = lm_hash; + } + + if (user->nt_password_present) { + if (!all_zero(user->ntpassword.hash, 16)) { + rc = sam_rid_crypt(rid, user->ntpassword.hash, + nt_hash.hash, SAMBA_GNUTLS_DECRYPT); + if (rc != 0) { + return gnutls_error_to_ntstatus(rc, + NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER); + } + } 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; + NTSTATUS status; + + data.data = user->user_private_info.SensitiveData; + data.length = user->user_private_info.DataLength; + + status = netlogon_creds_arcfour_crypt(creds, + data.data, + data.length); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + 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 (!all_zero(keys.keys.keys2.lmpassword.pwd.hash, + 16)) { + rc = sam_rid_crypt(rid, + keys.keys.keys2.lmpassword.pwd.hash, + lm_hash.hash, SAMBA_GNUTLS_DECRYPT); + if (rc != 0) { + return gnutls_error_to_ntstatus(rc, + NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER); + } + } 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 (!all_zero(keys.keys.keys2.ntpassword.pwd.hash, + 16)) { + rc = sam_rid_crypt(rid, + keys.keys.keys2.ntpassword.pwd.hash, + nt_hash.hash, SAMBA_GNUTLS_DECRYPT); + if (rc != 0) { + return gnutls_error_to_ntstatus(rc, + NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER); + } + } 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; + NTSTATUS status; + + status = netlogon_creds_arcfour_crypt(creds, + secret->current_cipher.cipher_data, + secret->current_cipher.maxlen); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + status = netlogon_creds_arcfour_crypt(creds, + secret->old_cipher.cipher_data, + secret->old_cipher.maxlen); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + 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; +} + |