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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.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, 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;
}
pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
if (!pac_blob) {
talloc_free(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;
}
nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
p->kdc_db_ctx->ic_ctx,
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 completly regenerate this pac */
krb5_pac_free(context, *pac);
ret = samba_make_krb5_pac(context, pac_blob, pac);
talloc_free(mem_ctx);
return ret;
}
/* Given an hdb entry (and in particular it's private member), consult
* the account_ok routine in auth/auth_sam.c for consistancy */
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)
{
krb5_error_code ret;
NTSTATUS nt_status;
TALLOC_CTX *tmp_ctx;
struct samba_kdc_entry *p;
char *workstation = NULL;
HostAddresses *addresses = req->req_body.addresses;
int i;
bool password_change;
tmp_ctx = talloc_new(client_ex->ctx);
p = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);
if (!tmp_ctx) {
return ENOMEM;
}
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';
}
}
password_change = (server_ex && server_ex->entry.flags.change_pw);
/* we allow all kinds of trusts here */
nt_status = authsam_account_ok(tmp_ctx,
p->kdc_db_ctx->samdb,
MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
p->realm_dn,
p->msg,
workstation,
client_name, true, password_change);
if (NT_STATUS_IS_OK(nt_status)) {
/* Now do the standard Heimdal check */
ret = kdc_check_flags(context, config,
client_ex, client_name,
server_ex, server_name,
req->msg_type == krb_as_req);
} else {
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;
}
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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