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4b59ecb903
Guenther
565 lines
15 KiB
C
565 lines
15 KiB
C
/*
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Unix SMB/CIFS implementation.
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kerberos authorization data (PAC) utility library
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Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Luke Howard 2002-2003
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Copyright (C) Stefan Metzmacher 2004-2005
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Copyright (C) Guenther Deschner 2005,2007,2008
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "librpc/gen_ndr/ndr_krb5pac.h"
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#ifdef HAVE_KRB5
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/****************************************************************
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****************************************************************/
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static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
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DATA_BLOB pac_data,
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struct PAC_SIGNATURE_DATA *sig,
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krb5_context context,
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krb5_keyblock *keyblock)
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{
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krb5_error_code ret;
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krb5_checksum cksum;
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krb5_keyusage usage = 0;
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smb_krb5_checksum_from_pac_sig(&cksum, sig);
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#ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */
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usage = KRB5_KU_OTHER_CKSUM;
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#elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */
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usage = KRB5_KEYUSAGE_APP_DATA_CKSUM;
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#else
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#error UNKNOWN_KRB5_KEYUSAGE
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#endif
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ret = smb_krb5_verify_checksum(context,
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keyblock,
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usage,
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&cksum,
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pac_data.data,
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pac_data.length);
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if (ret) {
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DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
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error_message(ret), ret));
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return ret;
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}
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return ret;
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}
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/****************************************************************
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****************************************************************/
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NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
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DATA_BLOB *pac_data_blob,
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krb5_context context,
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krb5_keyblock *service_keyblock,
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krb5_const_principal client_principal,
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time_t tgs_authtime,
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struct PAC_DATA **pac_data_out)
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{
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NTSTATUS status;
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enum ndr_err_code ndr_err;
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krb5_error_code ret;
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DATA_BLOB modified_pac_blob;
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NTTIME tgs_authtime_nttime;
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krb5_principal client_principal_pac = NULL;
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int i;
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struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
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struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
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struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
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struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
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struct PAC_LOGON_NAME *logon_name = NULL;
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struct PAC_LOGON_INFO *logon_info = NULL;
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struct PAC_DATA *pac_data = NULL;
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struct PAC_DATA_RAW *pac_data_raw = NULL;
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DATA_BLOB *srv_sig_blob = NULL;
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DATA_BLOB *kdc_sig_blob = NULL;
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*pac_data_out = NULL;
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pac_data = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA);
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pac_data_raw = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA_RAW);
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kdc_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
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srv_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
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if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
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return NT_STATUS_NO_MEMORY;
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}
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ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data,
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NULL, pac_data,
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(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the PAC: %s\n",
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nt_errstr(status)));
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return status;
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}
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if (pac_data->num_buffers < 4) {
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/* we need logon_ingo, service_key and kdc_key */
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DEBUG(0,("less than 4 PAC buffers\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data_raw,
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NULL, pac_data_raw,
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(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the PAC: %s\n",
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nt_errstr(status)));
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return status;
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}
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if (pac_data_raw->num_buffers < 4) {
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/* we need logon_ingo, service_key and kdc_key */
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DEBUG(0,("less than 4 PAC buffers\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (pac_data->num_buffers != pac_data_raw->num_buffers) {
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/* we need logon_ingo, service_key and kdc_key */
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DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
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pac_data->num_buffers, pac_data_raw->num_buffers));
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return NT_STATUS_INVALID_PARAMETER;
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}
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for (i=0; i < pac_data->num_buffers; i++) {
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if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
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DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
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i, pac_data->buffers[i].type, pac_data->buffers[i].type));
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return NT_STATUS_INVALID_PARAMETER;
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}
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switch (pac_data->buffers[i].type) {
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case PAC_TYPE_LOGON_INFO:
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if (!pac_data->buffers[i].info) {
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break;
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}
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logon_info = pac_data->buffers[i].info->logon_info.info;
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break;
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case PAC_TYPE_SRV_CHECKSUM:
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if (!pac_data->buffers[i].info) {
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break;
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}
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srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
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srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
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break;
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case PAC_TYPE_KDC_CHECKSUM:
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if (!pac_data->buffers[i].info) {
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break;
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}
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kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
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kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
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break;
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case PAC_TYPE_LOGON_NAME:
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logon_name = &pac_data->buffers[i].info->logon_name;
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break;
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default:
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break;
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}
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}
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if (!logon_info) {
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DEBUG(0,("PAC no logon_info\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!logon_name) {
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DEBUG(0,("PAC no logon_name\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!srv_sig_ptr || !srv_sig_blob) {
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DEBUG(0,("PAC no srv_key\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!kdc_sig_ptr || !kdc_sig_blob) {
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DEBUG(0,("PAC no kdc_key\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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/* Find and zero out the signatures, as required by the signing algorithm */
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/* We find the data blobs above, now we parse them to get at the exact portion we should zero */
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ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
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NULL, kdc_sig_wipe,
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(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the KDC signature: %s\n",
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nt_errstr(status)));
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return status;
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}
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ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
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NULL, srv_sig_wipe,
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(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the SRV signature: %s\n",
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nt_errstr(status)));
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return status;
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}
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/* Now zero the decoded structure */
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memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
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memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
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/* and reencode, back into the same place it came from */
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ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
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NULL, kdc_sig_wipe,
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(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't repack the KDC signature: %s\n",
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nt_errstr(status)));
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return status;
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}
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ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
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NULL, srv_sig_wipe,
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(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't repack the SRV signature: %s\n",
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nt_errstr(status)));
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return status;
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}
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/* push out the whole structure, but now with zero'ed signatures */
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ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
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NULL, pac_data_raw,
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(ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't repack the RAW PAC: %s\n",
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nt_errstr(status)));
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return status;
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}
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/* verify by service_key */
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ret = check_pac_checksum(mem_ctx,
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modified_pac_blob, srv_sig_ptr,
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context,
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service_keyblock);
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if (ret) {
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DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
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error_message(ret)));
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return NT_STATUS_ACCESS_DENIED;
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}
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/* Convert to NT time, so as not to loose accuracy in comparison */
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unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
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if (tgs_authtime_nttime != logon_name->logon_time) {
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DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
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DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
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DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
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return NT_STATUS_ACCESS_DENIED;
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}
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ret = smb_krb5_parse_name_norealm(context, logon_name->account_name,
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&client_principal_pac);
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if (ret) {
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DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
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logon_name->account_name,
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error_message(ret)));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!smb_krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
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DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
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logon_name->account_name));
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krb5_free_principal(context, client_principal_pac);
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return NT_STATUS_ACCESS_DENIED;
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}
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DEBUG(3,("Found account name from PAC: %s [%s]\n",
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logon_info->info3.base.account_name.string,
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logon_info->info3.base.full_name.string));
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DEBUG(10,("Successfully validated Kerberos PAC\n"));
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if (DEBUGLEVEL >= 10) {
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const char *s;
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s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
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if (s) {
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DEBUGADD(10,("%s\n", s));
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}
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}
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*pac_data_out = pac_data;
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return NT_STATUS_OK;
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}
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/****************************************************************
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****************************************************************/
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struct PAC_LOGON_INFO *get_logon_info_from_pac(struct PAC_DATA *pac_data)
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{
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int i;
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for (i=0; i < pac_data->num_buffers; i++) {
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if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
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continue;
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}
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return pac_data->buffers[i].info->logon_info.info;
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}
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return NULL;
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}
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/****************************************************************
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****************************************************************/
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NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
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const char *name,
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const char *pass,
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time_t time_offset,
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time_t *expire_time,
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time_t *renew_till_time,
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const char *cache_name,
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bool request_pac,
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bool add_netbios_addr,
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time_t renewable_time,
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struct PAC_DATA **pac_ret)
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{
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krb5_error_code ret;
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NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
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DATA_BLOB tkt, ap_rep, sesskey1, sesskey2;
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struct PAC_DATA *pac_data = NULL;
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char *client_princ_out = NULL;
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const char *auth_princ = NULL;
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const char *local_service = NULL;
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const char *cc = "MEMORY:kerberos_return_pac";
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ZERO_STRUCT(tkt);
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ZERO_STRUCT(ap_rep);
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ZERO_STRUCT(sesskey1);
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ZERO_STRUCT(sesskey2);
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if (!name || !pass) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (cache_name) {
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cc = cache_name;
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}
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if (!strchr_m(name, '@')) {
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auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
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lp_realm());
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} else {
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auth_princ = name;
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}
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NT_STATUS_HAVE_NO_MEMORY(auth_princ);
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local_service = talloc_asprintf(mem_ctx, "%s$@%s",
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global_myname(), lp_realm());
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NT_STATUS_HAVE_NO_MEMORY(local_service);
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ret = kerberos_kinit_password_ext(auth_princ,
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pass,
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time_offset,
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expire_time,
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renew_till_time,
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cc,
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request_pac,
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add_netbios_addr,
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renewable_time,
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&status);
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if (ret) {
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DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
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auth_princ, error_message(ret), ret));
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/* status already set */
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goto out;
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}
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DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
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if (expire_time) {
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DEBUGADD(10,("\tvalid until: %s (%d)\n",
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http_timestring(talloc_tos(), *expire_time),
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(int)*expire_time));
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}
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if (renew_till_time) {
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DEBUGADD(10,("\trenewable till: %s (%d)\n",
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http_timestring(talloc_tos(), *renew_till_time),
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(int)*renew_till_time));
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}
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/* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
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* in that case fallback to NTLM - gd */
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if (expire_time && renew_till_time &&
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(*expire_time == 0) && (*renew_till_time == 0)) {
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return NT_STATUS_INVALID_LOGON_TYPE;
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}
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ret = cli_krb5_get_ticket(local_service,
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time_offset,
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&tkt,
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&sesskey1,
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0,
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cc,
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NULL);
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if (ret) {
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DEBUG(1,("failed to get ticket for %s: %s\n",
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local_service, error_message(ret)));
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status = krb5_to_nt_status(ret);
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goto out;
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}
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status = ads_verify_ticket(mem_ctx,
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lp_realm(),
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time_offset,
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&tkt,
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&client_princ_out,
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&pac_data,
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&ap_rep,
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&sesskey2,
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False);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1,("ads_verify_ticket failed: %s\n",
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nt_errstr(status)));
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goto out;
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}
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if (!pac_data) {
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DEBUG(1,("no PAC\n"));
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status = NT_STATUS_INVALID_PARAMETER;
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goto out;
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}
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*pac_ret = pac_data;
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out:
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if (cc != cache_name) {
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ads_kdestroy(cc);
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}
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data_blob_free(&tkt);
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data_blob_free(&ap_rep);
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data_blob_free(&sesskey1);
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data_blob_free(&sesskey2);
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SAFE_FREE(client_princ_out);
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return status;
|
|
}
|
|
|
|
/****************************************************************
|
|
****************************************************************/
|
|
|
|
static NTSTATUS kerberos_return_pac_logon_info(TALLOC_CTX *mem_ctx,
|
|
const char *name,
|
|
const char *pass,
|
|
time_t time_offset,
|
|
time_t *expire_time,
|
|
time_t *renew_till_time,
|
|
const char *cache_name,
|
|
bool request_pac,
|
|
bool add_netbios_addr,
|
|
time_t renewable_time,
|
|
struct PAC_LOGON_INFO **logon_info)
|
|
{
|
|
NTSTATUS status;
|
|
struct PAC_DATA *pac_data = NULL;
|
|
struct PAC_LOGON_INFO *info = NULL;
|
|
|
|
status = kerberos_return_pac(mem_ctx,
|
|
name,
|
|
pass,
|
|
time_offset,
|
|
expire_time,
|
|
renew_till_time,
|
|
cache_name,
|
|
request_pac,
|
|
add_netbios_addr,
|
|
renewable_time,
|
|
&pac_data);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
if (!pac_data) {
|
|
DEBUG(3,("no pac\n"));
|
|
return NT_STATUS_INVALID_USER_BUFFER;
|
|
}
|
|
|
|
info = get_logon_info_from_pac(pac_data);
|
|
if (!info) {
|
|
DEBUG(1,("no logon_info\n"));
|
|
return NT_STATUS_INVALID_USER_BUFFER;
|
|
}
|
|
|
|
*logon_info = info;
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/****************************************************************
|
|
****************************************************************/
|
|
|
|
NTSTATUS kerberos_return_info3_from_pac(TALLOC_CTX *mem_ctx,
|
|
const char *name,
|
|
const char *pass,
|
|
time_t time_offset,
|
|
time_t *expire_time,
|
|
time_t *renew_till_time,
|
|
const char *cache_name,
|
|
bool request_pac,
|
|
bool add_netbios_addr,
|
|
time_t renewable_time,
|
|
struct netr_SamInfo3 **info3)
|
|
{
|
|
NTSTATUS status;
|
|
struct PAC_LOGON_INFO *logon_info = NULL;
|
|
|
|
status = kerberos_return_pac_logon_info(mem_ctx,
|
|
name,
|
|
pass,
|
|
time_offset,
|
|
expire_time,
|
|
renew_till_time,
|
|
cache_name,
|
|
request_pac,
|
|
add_netbios_addr,
|
|
renewable_time,
|
|
&logon_info);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
*info3 = &logon_info->info3;
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
#endif
|