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samba-mirror/source4/kdc/pac-glue.c

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/*
Unix SMB/CIFS implementation.
PAC Glue between Samba and the KDC
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
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 "kdc/kdc.h"
#include "dsdb/common/flags.h"
#include "lib/ldb/include/ldb.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "librpc/gen_ndr/krb5pac.h"
#include "auth/auth.h"
#include "auth/auth_sam.h"
#include "auth/auth_sam_reply.h"
#include "param/param.h"
struct krb5_dh_moduli;
struct _krb5_krb_auth_data;
krb5_error_code samba_kdc_plugin_init(krb5_context context, void **ptr)
{
*ptr = NULL;
return 0;
}
void samba_kdc_plugin_fini(void *ptr)
{
return;
}
static krb5_error_code make_pac(krb5_context context,
TALLOC_CTX *mem_ctx,
struct smb_iconv_convenience *iconv_convenience,
struct auth_serversupplied_info *server_info,
krb5_pac *pac)
{
struct PAC_LOGON_INFO_CTR logon_info;
struct netr_SamInfo3 *info3;
krb5_data pac_data;
NTSTATUS nt_status;
enum ndr_err_code ndr_err;
DATA_BLOB pac_out;
krb5_error_code ret;
ZERO_STRUCT(logon_info);
nt_status = auth_convert_server_info_saminfo3(mem_ctx, server_info, &info3);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
return EINVAL;
}
logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
if (!mem_ctx) {
return ENOMEM;
}
logon_info.info->info3 = *info3;
ndr_err = ndr_push_struct_blob(&pac_out, mem_ctx, iconv_convenience, &logon_info,
(ndr_push_flags_fn_t)ndr_push_PAC_LOGON_INFO_CTR);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
nt_status = ndr_map_error2ntstatus(ndr_err);
DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
return EINVAL;
}
ret = krb5_data_copy(&pac_data, pac_out.data, pac_out.length);
if (ret != 0) {
return ret;
}
ret = krb5_pac_init(context, pac);
if (ret != 0) {
krb5_data_free(&pac_data);
return ret;
}
ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
krb5_data_free(&pac_data);
if (ret != 0) {
return ret;
}
return ret;
}
/* Given the right private pointer from hdb_ldb, get a PAC from the attached ldb messages */
krb5_error_code samba_kdc_get_pac(void *priv,
krb5_context context,
struct hdb_entry_ex *client,
krb5_pac *pac)
{
krb5_error_code ret;
NTSTATUS nt_status;
struct auth_serversupplied_info *server_info;
struct hdb_ldb_private *private = talloc_get_type(client->ctx, struct hdb_ldb_private);
TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
unsigned int userAccountControl;
if (!mem_ctx) {
return ENOMEM;
}
/* The user account may be set not to want the PAC */
userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
*pac = NULL;
return 0;
}
nt_status = authsam_make_server_info(mem_ctx, private->samdb,
private->netbios_name,
private->msg,
private->realm_ref_msg,
data_blob(NULL, 0),
data_blob(NULL, 0),
&server_info);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(0, ("Getting user info for PAC failed: %s\n",
nt_errstr(nt_status)));
return ENOMEM;
}
ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info, pac);
talloc_free(mem_ctx);
return ret;
}
/* Resign (and reform, including possibly new groups) a PAC */
krb5_error_code samba_kdc_reget_pac(void *priv, krb5_context context,
const krb5_principal client_principal,
struct hdb_entry_ex *client,
struct hdb_entry_ex *server, krb5_pac *pac)
{
NTSTATUS nt_status;
enum ndr_err_code ndr_err;
krb5_error_code ret;
unsigned int userAccountControl;
struct hdb_ldb_private *private = talloc_get_type(server->ctx, struct hdb_ldb_private);
krb5_data k5pac_in;
DATA_BLOB pac_in;
struct PAC_LOGON_INFO_CTR logon_info;
union netr_Validation validation;
struct auth_serversupplied_info *server_info_out;
TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
if (!mem_ctx) {
return ENOMEM;
}
/* The service account may be set not to want the PAC */
userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
*pac = NULL;
return 0;
}
ret = krb5_pac_get_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &k5pac_in);
if (ret != 0) {
return ret;
}
pac_in = data_blob_talloc(mem_ctx, k5pac_in.data, k5pac_in.length);
krb5_data_free(&k5pac_in);
if (!pac_in.data) {
talloc_free(mem_ctx);
return ENOMEM;
}
ndr_err = ndr_pull_struct_blob(&pac_in, mem_ctx, private->iconv_convenience, &logon_info,
(ndr_pull_flags_fn_t)ndr_pull_PAC_LOGON_INFO_CTR);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !logon_info.info) {
nt_status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
talloc_free(mem_ctx);
return EINVAL;
}
/* Pull this right into the normal auth sysstem structures */
validation.sam3 = &logon_info.info->info3;
nt_status = make_server_info_netlogon_validation(mem_ctx,
"",
3, &validation,
&server_info_out);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return ENOMEM;
}
/* We will compleatly regenerate this pac */
krb5_pac_free(context, *pac);
ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info_out, pac);
talloc_free(mem_ctx);
return ret;
}
static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
NTSTATUS nt_status)
{
PA_DATA pa;
unsigned char *buf;
size_t len;
krb5_error_code ret = 0;
if (!e_data)
return;
pa.padata_type = KRB5_PADATA_PW_SALT;
pa.padata_value.length = 12;
pa.padata_value.data = malloc(pa.padata_value.length);
if (!pa.padata_value.data) {
e_data->length = 0;
e_data->data = NULL;
return;
}
SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
SIVAL(pa.padata_value.data, 4, 0);
SIVAL(pa.padata_value.data, 8, 1);
ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
free(pa.padata_value.data);
e_data->data = buf;
e_data->length = len;
return;
}
/* Given an hdb entry (and in particular it's private member), consult
* the account_ok routine in auth/auth_sam.c for consistancy */
krb5_error_code samba_kdc_check_client_access(void *priv,
krb5_context context, hdb_entry_ex *entry_ex,
KDC_REQ *req,
krb5_data *e_data)
{
krb5_error_code ret;
NTSTATUS nt_status;
TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
struct hdb_ldb_private *private = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
char *name, *workstation = NULL;
HostAddresses *addresses = req->req_body.addresses;
int i;
if (!tmp_ctx) {
return ENOMEM;
}
ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
if (ret != 0) {
talloc_free(tmp_ctx);
return ret;
}
if (addresses) {
for (i=0; i < addresses->len; i++) {
if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
if (workstation) {
break;
}
}
}
}
/* Strip space padding */
if (workstation) {
i = MIN(strlen(workstation), 15);
for (; i > 0 && workstation[i - 1] == ' '; i--) {
workstation[i - 1] = '\0';
}
}
nt_status = authsam_account_ok(tmp_ctx,
private->samdb,
MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
private->msg,
private->realm_ref_msg,
workstation,
name);
free(name);
if (NT_STATUS_IS_OK(nt_status))
return 0;
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
ret = KRB5KDC_ERR_KEY_EXPIRED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
ret = KRB5KDC_ERR_KEY_EXPIRED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
ret = KRB5KDC_ERR_CLIENT_REVOKED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
ret = KRB5KDC_ERR_CLIENT_REVOKED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
ret = KRB5KDC_ERR_CLIENT_REVOKED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
ret = KRB5KDC_ERR_CLIENT_REVOKED;
else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
ret = KRB5KDC_ERR_POLICY;
else
ret = KRB5KDC_ERR_POLICY;
samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
return ret;
}