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/*
Unix SMB/CIFS implementation.
PAC Glue between Samba and the KDC
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
Copyright (C) Simo Sorce <idra@samba.org> 2010
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 "../libds/common/flags.h"
#include "auth/auth.h"
#include "kdc/kdc-glue.h"
#include "param/param.h"
#include "kdc/pac-glue.h"
/* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */
static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context,
struct hdb_entry_ex *client,
krb5_pac *pac)
{
TALLOC_CTX *mem_ctx;
DATA_BLOB *pac_blob;
krb5_error_code ret;
NTSTATUS nt_status;
mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context");
if (!mem_ctx) {
return ENOMEM;
}
nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return EINVAL;
}
ret = samba_make_krb5_pac(context, pac_blob, pac);
talloc_free(mem_ctx);
return ret;
}
/* Resign (and reform, including possibly new groups) a PAC */
static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context,
const krb5_principal client_principal,
struct hdb_entry_ex *client,
struct hdb_entry_ex *server,
struct hdb_entry_ex *krbtgt,
krb5_pac *pac)
{
struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry);
TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context");
DATA_BLOB *pac_blob;
krb5_error_code ret;
NTSTATUS nt_status;
if (!mem_ctx) {
return ENOMEM;
}
/* The user account may be set not to want the PAC */
if (!samba_princ_needs_pac(server)) {
talloc_free(mem_ctx);
return EINVAL;
}
/* If the krbtgt was generated by an RODC, and we are not that
* RODC, then we need to regenerate the PAC - we can't trust
* it */
if (samba_krbtgt_was_untrusted_rodc(krbtgt)) {
nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return EINVAL;
}
} else {
pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
if (!pac_blob) {
talloc_free(mem_ctx);
return ENOMEM;
}
nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
pac, pac_blob);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(0, ("Building PAC failed: %s\n",
nt_errstr(nt_status)));
talloc_free(mem_ctx);
return EINVAL;
}
}
/* We now completely regenerate this pac */
krb5_pac_free(context, *pac);
ret = samba_make_krb5_pac(context, pac_blob, pac);
talloc_free(mem_ctx);
return ret;
}
static char *get_netbios_name(TALLOC_CTX *mem_ctx, HostAddresses *addrs)
{
char *nb_name = NULL;
size_t len;
unsigned int i;
for (i = 0; addrs && i < addrs->len; i++) {
if (addrs->val[i].addr_type != KRB5_ADDRESS_NETBIOS) {
continue;
}
len = MIN(addrs->val[i].address.length, 15);
nb_name = talloc_strndup(mem_ctx,
addrs->val[i].address.data, len);
if (nb_name) {
break;
}
}
if (nb_name == NULL) {
return NULL;
}
/* Strip space padding */
i = strlen(nb_name) - 1;
while (i > 0 && nb_name[i] == ' ') {
nb_name[i] = '\0';
}
return nb_name;
}
static krb5_data fill_krb5_data(void *data, size_t length)
{
krb5_data kdata;
kdata.data = data;
kdata.length = length;
return kdata;
}
static krb5_error_code samba_wdc_check_client_access(void *priv,
krb5_context context,
krb5_kdc_configuration *config,
hdb_entry_ex *client_ex, const char *client_name,
hdb_entry_ex *server_ex, const char *server_name,
KDC_REQ *req,
krb5_data *e_data)
{
struct samba_kdc_entry *kdc_entry;
bool password_change;
char *workstation;
NTSTATUS nt_status;
kdc_entry = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);
password_change = (server_ex && server_ex->entry.flags.change_pw);
workstation = get_netbios_name((TALLOC_CTX *)client_ex->ctx,
req->req_body.addresses);
nt_status = samba_kdc_check_client_access(kdc_entry,
client_name,
workstation,
password_change);
if (!NT_STATUS_IS_OK(nt_status)) {
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
return ENOMEM;
}
if (e_data) {
DATA_BLOB data;
samba_kdc_build_edata_reply(nt_status, &data);
*e_data = fill_krb5_data(data.data, data.length);
}
return samba_kdc_map_policy_err(nt_status);
}
/* Now do the standard Heimdal check */
return kdc_check_flags(context, config,
client_ex, client_name,
server_ex, server_name,
req->msg_type == krb_as_req);
}
static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr)
{
*ptr = NULL;
return 0;
}
static void samba_wdc_plugin_fini(void *ptr)
{
return;
}
struct krb5plugin_windc_ftable windc_plugin_table = {
.minor_version = KRB5_WINDC_PLUGING_MINOR,
.init = samba_wdc_plugin_init,
.fini = samba_wdc_plugin_fini,
.pac_generate = samba_wdc_get_pac,
.pac_verify = samba_wdc_reget_pac,
.client_access = samba_wdc_check_client_access,
};
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