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/*
* GSSAPI Acceptor
* DCERPC Server functions
* Copyright (C) Simo Sorce 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 "rpc_server/dcesrv_gssapi.h"
#include "../librpc/gen_ndr/ndr_krb5pac.h"
#include "../lib/tsocket/tsocket.h"
#include "librpc/crypto/gse.h"
#include "auth.h"
#ifdef HAVE_KRB5
#include "libcli/auth/krb5_wrap.h"
#endif
NTSTATUS gssapi_server_auth_start(TALLOC_CTX *mem_ctx,
bool do_sign,
bool do_seal,
bool is_dcerpc,
DATA_BLOB *token_in,
DATA_BLOB *token_out,
struct gse_context **ctx)
{
struct gse_context *gse_ctx = NULL;
uint32_t add_flags = 0;
NTSTATUS status;
if (is_dcerpc) {
add_flags = GSS_C_DCE_STYLE;
}
/* Let's init the gssapi machinery for this connection */
/* passing a NULL server name means the server will try
* to accept any connection regardless of the name used as
* long as it can find a decryption key */
/* by passing NULL, the code will attempt to set a default
* keytab based on configuration options */
status = gse_init_server(mem_ctx, do_sign, do_seal,
add_flags, &gse_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to init dcerpc gssapi server (%s)\n",
nt_errstr(status)));
return status;
}
status = gse_get_server_auth_token(mem_ctx, gse_ctx,
token_in, token_out);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to parse initial client token (%s)\n",
nt_errstr(status)));
goto done;
}
*ctx = gse_ctx;
status = NT_STATUS_OK;
done:
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(gse_ctx);
}
return status;
}
NTSTATUS gssapi_server_step(struct gse_context *gse_ctx,
TALLOC_CTX *mem_ctx,
DATA_BLOB *token_in,
DATA_BLOB *token_out)
{
NTSTATUS status;
status = gse_get_server_auth_token(mem_ctx, gse_ctx,
token_in, token_out);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (gse_require_more_processing(gse_ctx)) {
/* ask for next leg */
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
return NT_STATUS_OK;
}
NTSTATUS gssapi_server_check_flags(struct gse_context *gse_ctx)
{
return gse_verify_server_auth_flags(gse_ctx);
}
NTSTATUS gssapi_server_get_user_info(struct gse_context *gse_ctx,
TALLOC_CTX *mem_ctx,
const struct tsocket_address *remote_address,
struct auth_serversupplied_info **server_info)
{
TALLOC_CTX *tmp_ctx;
DATA_BLOB pac_blob;
struct PAC_DATA *pac_data = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
unsigned int i;
bool is_mapped;
bool is_guest;
char *princ_name;
char *ntuser;
char *ntdomain;
char *username;
char *rhost;
struct passwd *pw;
NTSTATUS status;
int rc;
tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
status = gse_get_pac_blob(gse_ctx, tmp_ctx, &pac_blob);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
/* TODO: Fetch user by principal name ? */
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
#ifdef HAVE_KRB5
status = kerberos_decode_pac(tmp_ctx,
pac_blob,
NULL, NULL, NULL, NULL, 0, &pac_data);
#else
status = NT_STATUS_ACCESS_DENIED;
#endif
data_blob_free(&pac_blob);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
status = gse_get_client_name(gse_ctx, tmp_ctx, &princ_name);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
/* get logon name and logon info */
for (i = 0; i < pac_data->num_buffers; i++) {
struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
switch (data_buf->type) {
case PAC_TYPE_LOGON_INFO:
if (!data_buf->info) {
break;
}
logon_info = data_buf->info->logon_info.info;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
rc = get_remote_hostname(remote_address,
&rhost,
tmp_ctx);
if (rc < 0) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
if (strequal(rhost, "UNKNOWN")) {
rhost = tsocket_address_inet_addr_string(remote_address,
tmp_ctx);
if (rhost == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
}
status = get_user_from_kerberos_info(tmp_ctx, rhost,
princ_name, logon_info,
&is_mapped, &is_guest,
&ntuser, &ntdomain,
&username, &pw);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos principal to system user "
"(%s)\n", nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
/* TODO: save PAC data in netsamlogon cache ? */
status = make_session_info_krb5(mem_ctx,
ntuser, ntdomain, username, pw,
logon_info, is_guest, is_mapped, NULL /* No session key for now */,
server_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
ntuser, ntdomain, rhost));
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
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