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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 "librpc/crypto/gse.h"
#include "auth.h"
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, NULL, &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,
struct client_address *client_id,
struct auth_serversupplied_info **server_info)
{
TALLOC_CTX *tmp_ctx;
DATA_BLOB auth_data;
time_t tgs_authtime;
NTTIME tgs_authtime_nttime;
DATA_BLOB pac;
struct PAC_DATA *pac_data;
struct PAC_LOGON_NAME *logon_name = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
enum ndr_err_code ndr_err;
unsigned int i;
bool is_mapped;
bool is_guest;
char *princ_name;
char *ntuser;
char *ntdomain;
char *username;
struct passwd *pw;
NTSTATUS status;
bool bret;
tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
status = gse_get_authz_data(gse_ctx, tmp_ctx, &auth_data);
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;
}
bret = unwrap_pac(tmp_ctx, &auth_data, &pac);
if (!bret) {
DEBUG(1, ("Failed to unwrap PAC\n"));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
status = gse_get_client_name(gse_ctx, tmp_ctx, &princ_name);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
status = gse_get_authtime(gse_ctx, &tgs_authtime);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
pac_data = talloc_zero(tmp_ctx, struct PAC_DATA);
if (!pac_data) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
ndr_err = ndr_pull_struct_blob(&pac, pac_data, pac_data,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(1, ("Failed to parse the PAC for %s\n", princ_name));
status = ndr_map_error2ntstatus(ndr_err);
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;
case PAC_TYPE_LOGON_NAME:
logon_name = &data_buf->info->logon_name;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
if (!logon_name) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
/* check time */
if (tgs_authtime_nttime != logon_name->logon_time) {
DEBUG(1, ("Logon time mismatch between ticket and PAC!\n"
"PAC Time = %s | Ticket Time = %s\n",
nt_time_string(tmp_ctx, logon_name->logon_time),
nt_time_string(tmp_ctx, tgs_authtime_nttime)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
/* TODO: Should we check princ_name against account_name in
* logon_name ? Are they supposed to be identical, or can an
* account_name be different from the UPN ? */
status = get_user_from_kerberos_info(tmp_ctx, client_id->name,
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, client_id->name));
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
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