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/*
Unix SMB/CIFS implementation.
SASL/EXTERNAL authentication.
Copyright (C) Howard Chu <hyc@symas.com> 2013
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 <tevent.h>
#include "lib/util/tevent_ntstatus.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "auth/gensec/gensec_proto.h"
#include "auth/gensec/gensec_toplevel_proto.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/* SASL/EXTERNAL is essentially a no-op; it is only usable when the transport
* layer is already mutually authenticated.
*/
NTSTATUS gensec_external_init(TALLOC_CTX *ctx);
static NTSTATUS gensec_external_start(struct gensec_security *gensec_security)
{
if (gensec_security->want_features & GENSEC_FEATURE_SIGN)
return NT_STATUS_INVALID_PARAMETER;
if (gensec_security->want_features & GENSEC_FEATURE_SEAL)
return NT_STATUS_INVALID_PARAMETER;
return NT_STATUS_OK;
}
struct gensec_external_update_state {
DATA_BLOB out;
};
static struct tevent_req *gensec_external_update_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct gensec_security *gensec_security,
const DATA_BLOB in)
{
struct tevent_req *req;
struct gensec_external_update_state *state = NULL;
req = tevent_req_create(mem_ctx, &state,
struct gensec_external_update_state);
if (req == NULL) {
return NULL;
}
state->out = data_blob_talloc(state, "", 0);
if (tevent_req_nomem(state->out.data, req)) {
return tevent_req_post(req, ev);
}
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS gensec_external_update_recv(struct tevent_req *req,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *out)
{
struct gensec_external_update_state *state =
tevent_req_data(req,
struct gensec_external_update_state);
NTSTATUS status;
*out = data_blob_null;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out = state->out;
tevent_req_received(req);
return NT_STATUS_OK;
}
/* We have no features */
static bool gensec_external_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
return false;
}
static const struct gensec_security_ops gensec_external_ops = {
.name = "sasl-EXTERNAL",
.sasl_name = "EXTERNAL",
.client_start = gensec_external_start,
.update_send = gensec_external_update_send,
.update_recv = gensec_external_update_recv,
.have_feature = gensec_external_have_feature,
.enabled = true,
.priority = GENSEC_EXTERNAL
};
NTSTATUS gensec_external_init(TALLOC_CTX *ctx)
{
NTSTATUS ret;
ret = gensec_register(ctx, &gensec_external_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_external_ops.name));
}
return ret;
}
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