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/*
Unix SMB/CIFS implementation.
HTTP library - Basic 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 "auth/credentials/credentials.h"
#include "lib/util/base64.h"
_PUBLIC_ NTSTATUS gensec_http_basic_init(TALLOC_CTX *);
struct gensec_http_basic_state {
enum {
GENSEC_HTTP_BASIC_START,
GENSEC_HTTP_BASIC_DONE,
GENSEC_HTTP_BASIC_ERROR,
} step;
};
static NTSTATUS gensec_http_basic_client_start(struct gensec_security *gensec)
{
struct gensec_http_basic_state *state;
state = talloc_zero(gensec, struct gensec_http_basic_state);
if (state == NULL) {
return NT_STATUS_NO_MEMORY;
}
gensec->private_data = state;
state->step = GENSEC_HTTP_BASIC_START;
return NT_STATUS_OK;
}
struct gensec_http_basic_update_state {
NTSTATUS status;
DATA_BLOB out;
};
static NTSTATUS gensec_http_basic_update_internal(struct gensec_security *gensec_ctx,
TALLOC_CTX *mem_ctx,
const DATA_BLOB in,
DATA_BLOB *out);
static struct tevent_req *gensec_http_basic_update_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct gensec_security *gensec_security,
const DATA_BLOB in)
{
struct tevent_req *req = NULL;
struct gensec_http_basic_update_state *state = NULL;
NTSTATUS status;
req = tevent_req_create(mem_ctx, &state,
struct gensec_http_basic_update_state);
if (req == NULL) {
return NULL;
}
status = gensec_http_basic_update_internal(gensec_security,
state, in,
&state->out);
state->status = status;
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS gensec_http_basic_update_internal(struct gensec_security *gensec_ctx,
TALLOC_CTX *mem_ctx,
const DATA_BLOB in,
DATA_BLOB *out)
{
struct gensec_http_basic_state *state;
struct cli_credentials *creds;
char *tmp, *b64;
state = talloc_get_type_abort(gensec_ctx->private_data,
struct gensec_http_basic_state);
creds = gensec_get_credentials(gensec_ctx);
switch (gensec_ctx->gensec_role) {
case GENSEC_CLIENT:
switch (state->step) {
case GENSEC_HTTP_BASIC_START:
tmp = talloc_asprintf(mem_ctx, "%s\\%s:%s",
cli_credentials_get_domain(creds),
cli_credentials_get_username(creds),
cli_credentials_get_password(creds));
if (tmp == NULL) {
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_NO_MEMORY;
}
*out = data_blob_string_const(tmp);
b64 = base64_encode_data_blob(mem_ctx, *out);
if (b64 == NULL) {
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_NO_MEMORY;
}
TALLOC_FREE(tmp);
tmp = talloc_asprintf(mem_ctx, "Basic %s", b64);
if (tmp == NULL) {
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_NO_MEMORY;
}
TALLOC_FREE(b64);
*out = data_blob_string_const(tmp);
state->step = GENSEC_HTTP_BASIC_DONE;
return NT_STATUS_OK;
case GENSEC_HTTP_BASIC_DONE:
case GENSEC_HTTP_BASIC_ERROR:
default:
break;
}
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_INTERNAL_ERROR;
case GENSEC_SERVER:
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_NOT_IMPLEMENTED;
}
state->step = GENSEC_HTTP_BASIC_ERROR;
return NT_STATUS_INTERNAL_ERROR;
}
static NTSTATUS gensec_http_basic_update_recv(struct tevent_req *req,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *out)
{
struct gensec_http_basic_update_state *state =
tevent_req_data(req,
struct gensec_http_basic_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_basic_security_ops = {
.name = "http_basic",
.auth_type = 0,
.client_start = gensec_http_basic_client_start,
.update_send = gensec_http_basic_update_send,
.update_recv = gensec_http_basic_update_recv,
.enabled = true,
.priority = GENSEC_EXTERNAL,
};
_PUBLIC_ NTSTATUS gensec_http_basic_init(TALLOC_CTX *ctx)
{
NTSTATUS status;
status = gensec_register(ctx, &gensec_http_basic_security_ops);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register '%s' gensec backend!\n",
gensec_http_basic_security_ops.name));
return status;
}
return status;
}
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