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samba-mirror/source4/kdc/pac-glue.c
Andrew Bartlett 08976cb3d2 r20639: Commit part 1 of 2.
This patch updates our build system and glue to support a new snapshot
of lorikeet-heimdal.

We now procude a [SUBSYTEM] in the ans1_deps.pl script, and can depend
on that in the heimdal_build/config.mk.  This is much easier than
listing every generated .o file individually.

This required some small changes to the build system, due to the way
the parent directory was handled for the output of scripts.  I've also
cleaned up et_deps.pl to handle cleaning up it's generated files on
clean.

The PAC glue in Heimdal has changed significantly: we no longer have a
custom hack in the KDC, instead we have the windc plugin interface.
As such, pac-glue.c is much smaller.  In the future, when I'm
confident of the new code, we will also be able to 'downsize'
auth/kerberos/kerberos_pac.c.

(I'll include the updated copy of heimdal in the next chekin, to make
it clearer what's changed in Samba4 itself).

Andrew Bartlett
(This used to be commit 75fddbbc08)
2007-10-10 14:37:20 -05:00

278 lines
7.2 KiB
C

/*
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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"
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 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;
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;
nt_status = ndr_push_struct_blob(&pac_out, mem_ctx, &logon_info,
(ndr_push_flags_fn_t)ndr_push_PAC_LOGON_INFO_CTR);
if (!NT_STATUS_IS_OK(nt_status)) {
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->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, 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;
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;
}
nt_status = ndr_pull_struct_blob(&pac_in, mem_ctx, &logon_info,
(ndr_pull_flags_fn_t)ndr_pull_PAC_LOGON_INFO_CTR);
if (!NT_STATUS_IS_OK(nt_status) || !logon_info.info) {
talloc_free(mem_ctx);
DEBUG(0,("can't parse the PAC LOGON_INFO\n"));
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, server_info_out, 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 */
krb5_error_code samba_kdc_check_client_access(void *priv,
krb5_context context, hdb_entry_ex *entry_ex,
KDC_REQ *req)
{
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);
/* TODO: Need a more complete mapping of NTSTATUS to krb5kdc errors */
if (!NT_STATUS_IS_OK(nt_status)) {
return KRB5KDC_ERR_POLICY;
}
return 0;
}