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535035affc
Guenther Signed-off-by: Günther Deschner <gd@samba.org> Reviewed-by: Alexander Bokovoy <ab@samba.org>
432 lines
12 KiB
C
432 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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PAC Glue between Samba and the KDC
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
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Copyright (C) Simo Sorce <idra@samba.org> 2010
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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 "../libds/common/flags.h"
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#include <ldb.h>
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#include "auth/auth.h"
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#include "auth/auth_sam_reply.h"
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#include "system/kerberos.h"
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#include "auth/kerberos/kerberos.h"
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#include "kdc/samba_kdc.h"
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#include "kdc/pac-glue.h"
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#include "param/param.h"
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#include "librpc/gen_ndr/ndr_krb5pac.h"
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#include "libcli/security/security.h"
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#include "dsdb/samdb/samdb.h"
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#include "auth/kerberos/pac_utils.h"
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static
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NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
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struct auth_user_info_dc *info,
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DATA_BLOB *pac_data)
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{
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struct netr_SamInfo3 *info3;
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union PAC_INFO pac_info;
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enum ndr_err_code ndr_err;
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NTSTATUS nt_status;
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ZERO_STRUCT(pac_info);
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nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx, info, &info3);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(1, ("Getting Samba info failed: %s\n",
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nt_errstr(nt_status)));
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return nt_status;
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}
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pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
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if (!pac_info.logon_info.info) {
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return NT_STATUS_NO_MEMORY;
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}
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pac_info.logon_info.info->info3 = *info3;
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ndr_err = ndr_push_union_blob(pac_data, mem_ctx, &pac_info,
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PAC_TYPE_LOGON_INFO,
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(ndr_push_flags_fn_t)ndr_push_PAC_INFO);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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nt_status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(1, ("PAC (presig) push failed: %s\n",
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nt_errstr(nt_status)));
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return nt_status;
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}
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return NT_STATUS_OK;
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}
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krb5_error_code samba_make_krb5_pac(krb5_context context,
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DATA_BLOB *pac_blob,
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DATA_BLOB *deleg_blob,
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krb5_pac *pac)
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{
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krb5_data pac_data;
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krb5_data deleg_data;
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krb5_error_code ret;
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/* The user account may be set not to want the PAC */
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if (!pac_blob) {
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return 0;
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}
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ret = krb5_copy_data_contents(&pac_data,
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pac_blob->data,
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pac_blob->length);
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if (ret != 0) {
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return ret;
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}
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ZERO_STRUCT(deleg_data);
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if (deleg_blob) {
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ret = krb5_copy_data_contents(&deleg_data,
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deleg_blob->data,
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deleg_blob->length);
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if (ret != 0) {
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kerberos_free_data_contents(context, &pac_data);
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return ret;
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}
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}
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ret = krb5_pac_init(context, pac);
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if (ret != 0) {
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kerberos_free_data_contents(context, &pac_data);
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kerberos_free_data_contents(context, &deleg_data);
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return ret;
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}
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ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
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kerberos_free_data_contents(context, &pac_data);
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if (ret != 0) {
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kerberos_free_data_contents(context, &deleg_data);
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return ret;
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}
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if (deleg_blob) {
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ret = krb5_pac_add_buffer(context, *pac,
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PAC_TYPE_CONSTRAINED_DELEGATION,
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&deleg_data);
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kerberos_free_data_contents(context, &deleg_data);
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if (ret != 0) {
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return ret;
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}
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}
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return ret;
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}
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bool samba_princ_needs_pac(struct samba_kdc_entry *skdc_entry)
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{
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uint32_t userAccountControl;
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/* The service account may be set not to want the PAC */
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userAccountControl = ldb_msg_find_attr_as_uint(skdc_entry->msg, "userAccountControl", 0);
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if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
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return false;
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}
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return true;
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}
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/* Was the krbtgt in this DB (ie, should we check the incoming signature) and was it an RODC */
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int samba_krbtgt_is_in_db(struct samba_kdc_entry *p,
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bool *is_in_db,
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bool *is_untrusted)
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{
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NTSTATUS status;
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int rodc_krbtgt_number, trust_direction;
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uint32_t rid;
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TALLOC_CTX *mem_ctx = talloc_new(NULL);
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if (!mem_ctx) {
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return ENOMEM;
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}
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trust_direction = ldb_msg_find_attr_as_int(p->msg, "trustDirection", 0);
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if (trust_direction != 0) {
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/* Domain trust - we cannot check the sig, but we trust it for a correct PAC
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This is exactly where we should flag for SID
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validation when we do inter-foreest trusts
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*/
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talloc_free(mem_ctx);
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*is_untrusted = false;
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*is_in_db = false;
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return 0;
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}
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/* The lack of password controls etc applies to krbtgt by
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* virtue of being that particular RID */
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status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, p->msg, "objectSid"), NULL, &rid);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(mem_ctx);
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return EINVAL;
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}
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rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
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if (p->kdc_db_ctx->my_krbtgt_number == 0) {
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if (rid == DOMAIN_RID_KRBTGT) {
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*is_untrusted = false;
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*is_in_db = true;
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talloc_free(mem_ctx);
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return 0;
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} else if (rodc_krbtgt_number != -1) {
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*is_in_db = true;
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*is_untrusted = true;
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talloc_free(mem_ctx);
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return 0;
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}
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} else if ((rid != DOMAIN_RID_KRBTGT) && (rodc_krbtgt_number == p->kdc_db_ctx->my_krbtgt_number)) {
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talloc_free(mem_ctx);
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*is_untrusted = false;
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*is_in_db = true;
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return 0;
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} else if (rid == DOMAIN_RID_KRBTGT) {
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/* krbtgt viewed from an RODC */
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talloc_free(mem_ctx);
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*is_untrusted = false;
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*is_in_db = false;
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return 0;
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}
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/* Another RODC */
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talloc_free(mem_ctx);
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*is_untrusted = true;
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*is_in_db = false;
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return 0;
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}
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NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
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struct samba_kdc_entry *p,
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DATA_BLOB **_pac_blob)
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{
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struct auth_user_info_dc *user_info_dc;
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DATA_BLOB *pac_blob;
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NTSTATUS nt_status;
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/* The user account may be set not to want the PAC */
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if ( ! samba_princ_needs_pac(p)) {
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*_pac_blob = NULL;
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return NT_STATUS_OK;
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}
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pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
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if (!pac_blob) {
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return NT_STATUS_NO_MEMORY;
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}
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nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
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lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
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lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
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p->realm_dn,
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p->msg,
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data_blob(NULL, 0),
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data_blob(NULL, 0),
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&user_info_dc);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(0, ("Getting user info for PAC failed: %s\n",
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nt_errstr(nt_status)));
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return nt_status;
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}
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nt_status = samba_get_logon_info_pac_blob(mem_ctx, user_info_dc, pac_blob);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(0, ("Building PAC failed: %s\n",
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nt_errstr(nt_status)));
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return nt_status;
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}
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*_pac_blob = pac_blob;
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return NT_STATUS_OK;
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}
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NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
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krb5_context context,
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const krb5_pac pac, DATA_BLOB *pac_blob,
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struct PAC_SIGNATURE_DATA *pac_srv_sig,
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struct PAC_SIGNATURE_DATA *pac_kdc_sig)
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{
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struct auth_user_info_dc *user_info_dc;
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krb5_error_code ret;
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NTSTATUS nt_status;
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ret = kerberos_pac_to_user_info_dc(mem_ctx, pac,
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context, &user_info_dc, pac_srv_sig, pac_kdc_sig);
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if (ret) {
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return NT_STATUS_UNSUCCESSFUL;
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}
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nt_status = samba_get_logon_info_pac_blob(mem_ctx,
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user_info_dc, pac_blob);
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return nt_status;
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}
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NTSTATUS samba_kdc_update_delegation_info_blob(TALLOC_CTX *mem_ctx,
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krb5_context context,
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const krb5_pac pac,
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const krb5_principal server_principal,
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const krb5_principal proxy_principal,
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DATA_BLOB *new_blob)
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{
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krb5_data old_data;
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DATA_BLOB old_blob;
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krb5_error_code ret;
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NTSTATUS nt_status;
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enum ndr_err_code ndr_err;
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union PAC_INFO info;
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struct PAC_CONSTRAINED_DELEGATION _d;
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struct PAC_CONSTRAINED_DELEGATION *d = NULL;
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char *server = NULL;
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char *proxy = NULL;
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uint32_t i;
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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if (tmp_ctx == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_CONSTRAINED_DELEGATION, &old_data);
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if (ret == ENOENT) {
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ZERO_STRUCT(old_data);
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} else if (ret) {
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talloc_free(tmp_ctx);
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return NT_STATUS_UNSUCCESSFUL;
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}
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old_blob.length = old_data.length;
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old_blob.data = (uint8_t *)old_data.data;
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ZERO_STRUCT(info);
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if (old_blob.length > 0) {
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ndr_err = ndr_pull_union_blob(&old_blob, mem_ctx,
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&info, PAC_TYPE_CONSTRAINED_DELEGATION,
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(ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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kerberos_free_data_contents(context, &old_data);
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nt_status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
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talloc_free(tmp_ctx);
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return nt_status;
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}
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} else {
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ZERO_STRUCT(_d);
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info.constrained_delegation.info = &_d;
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}
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kerberos_free_data_contents(context, &old_data);
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ret = krb5_unparse_name(context, server_principal, &server);
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if (ret) {
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talloc_free(tmp_ctx);
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return NT_STATUS_INTERNAL_ERROR;
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}
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ret = krb5_unparse_name_flags(context, proxy_principal,
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KRB5_PRINCIPAL_UNPARSE_NO_REALM, &proxy);
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if (ret) {
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SAFE_FREE(server);
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talloc_free(tmp_ctx);
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return NT_STATUS_INTERNAL_ERROR;
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}
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d = info.constrained_delegation.info;
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i = d->num_transited_services;
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d->proxy_target.string = server;
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d->transited_services = talloc_realloc(mem_ctx, d->transited_services,
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struct lsa_String, i + 1);
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d->transited_services[i].string = proxy;
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d->num_transited_services = i + 1;
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ndr_err = ndr_push_union_blob(new_blob, mem_ctx,
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&info, PAC_TYPE_CONSTRAINED_DELEGATION,
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(ndr_push_flags_fn_t)ndr_push_PAC_INFO);
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SAFE_FREE(server);
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SAFE_FREE(proxy);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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kerberos_free_data_contents(context, &old_data);
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nt_status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
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talloc_free(tmp_ctx);
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return nt_status;
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}
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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}
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/* function to map policy errors */
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krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
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{
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krb5_error_code ret;
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if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
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ret = KRB5KDC_ERR_KEY_EXP;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
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ret = KRB5KDC_ERR_KEY_EXP;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
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ret = KRB5KDC_ERR_POLICY;
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else
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ret = KRB5KDC_ERR_POLICY;
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return ret;
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}
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/* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
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* for consistency */
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NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
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const char *client_name,
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const char *workstation,
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bool password_change)
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{
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TALLOC_CTX *tmp_ctx;
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NTSTATUS nt_status;
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tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
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if (!tmp_ctx) {
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return NT_STATUS_NO_MEMORY;
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}
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/* we allow all kinds of trusts here */
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nt_status = authsam_account_ok(tmp_ctx,
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kdc_entry->kdc_db_ctx->samdb,
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MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
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MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
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kdc_entry->realm_dn, kdc_entry->msg,
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workstation, client_name,
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true, password_change);
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talloc_free(tmp_ctx);
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return nt_status;
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}
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