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/*
Unix SMB/CIFS implementation.
HTTP library - NTLM authentication mechanism gensec module
Copyright (C) 2014 Samuel Cabrero <samuelcabrero@kernevil.me>
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/auth.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "lib/util/base64.h"
_PUBLIC_ NTSTATUS gensec_http_ntlm_init(TALLOC_CTX *);
struct gensec_http_ntlm_state {
struct gensec_security *sub;
};
static NTSTATUS gensec_http_ntlm_client_start(struct gensec_security *gensec)
{
NTSTATUS status;
struct gensec_http_ntlm_state *state;
state = talloc_zero(gensec, struct gensec_http_ntlm_state);
if (state == NULL) {
return NT_STATUS_NO_MEMORY;
}
gensec->private_data = state;
status = gensec_subcontext_start(state, gensec, &state->sub);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
return gensec_start_mech_by_oid(state->sub, GENSEC_OID_NTLMSSP);
}
struct gensec_http_ntlm_update_state {
DATA_BLOB ntlm_in;
NTSTATUS status;
DATA_BLOB out;
};
static void gensec_http_ntlm_update_done(struct tevent_req *subreq);
static struct tevent_req *gensec_http_ntlm_update_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct gensec_security *gensec_ctx,
const DATA_BLOB in)
{
struct gensec_http_ntlm_state *http_ntlm =
talloc_get_type_abort(gensec_ctx->private_data,
struct gensec_http_ntlm_state);
struct tevent_req *req = NULL;
struct gensec_http_ntlm_update_state *state = NULL;
struct tevent_req *subreq = NULL;
req = tevent_req_create(mem_ctx, &state,
struct gensec_http_ntlm_update_state);
if (req == NULL) {
return NULL;
}
if (in.length) {
if (strncasecmp((char *)in.data, "NTLM ", 5) != 0) {
tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
return tevent_req_post(req, ev);
}
state->ntlm_in = base64_decode_data_blob_talloc(state,
(char *)&in.data[5]);
}
subreq = gensec_update_send(state, ev,
http_ntlm->sub,
state->ntlm_in);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, gensec_http_ntlm_update_done, req);
return req;
}
static void gensec_http_ntlm_update_done(struct tevent_req *subreq)
{
struct tevent_req *req =
tevent_req_callback_data(subreq,
struct tevent_req);
struct gensec_http_ntlm_update_state *state =
tevent_req_data(req,
struct gensec_http_ntlm_update_state);
NTSTATUS status;
DATA_BLOB ntlm_out;
char *b64 = NULL;
char *str = NULL;
status = gensec_update_recv(subreq, state, &ntlm_out);
TALLOC_FREE(subreq);
state->status = status;
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
status = NT_STATUS_OK;
}
if (tevent_req_nterror(req, status)) {
return;
}
b64 = base64_encode_data_blob(state, ntlm_out);
data_blob_free(&ntlm_out);
if (tevent_req_nomem(b64, req)) {
return;
}
str = talloc_asprintf(state, "NTLM %s", b64);
TALLOC_FREE(b64);
if (tevent_req_nomem(str, req)) {
return;
}
state->out = data_blob_string_const(str);
return;
}
static NTSTATUS gensec_http_ntlm_update_recv(struct tevent_req *req,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *out)
{
struct gensec_http_ntlm_update_state *state =
tevent_req_data(req,
struct gensec_http_ntlm_update_state);
NTSTATUS status;
*out = data_blob_null;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out = state->out;
talloc_steal(out_mem_ctx, state->out.data);
status = state->status;
tevent_req_received(req);
return status;
}
static const struct gensec_security_ops gensec_http_ntlm_security_ops = {
.name = "http_ntlm",
.auth_type = 0,
.client_start = gensec_http_ntlm_client_start,
.update_send = gensec_http_ntlm_update_send,
.update_recv = gensec_http_ntlm_update_recv,
.enabled = true,
.priority = GENSEC_EXTERNAL,
};
_PUBLIC_ NTSTATUS gensec_http_ntlm_init(TALLOC_CTX *ctx)
{
NTSTATUS status;
status = gensec_register(ctx, &gensec_http_ntlm_security_ops);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register '%s' gensec backend!\n",
gensec_http_ntlm_security_ops.name));
return status;
}
return status;
}
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