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/*
Unix SMB/CIFS implementation.
Generic Authentication Interface
Copyright (C) Andrew Tridgell 2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
Copyright (C) Stefan Metzmacher 2004
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "libcli/composite/composite.h"
/*
do a non-athenticated dcerpc bind
*/
struct composite_context *dcerpc_bind_auth_none_send(TALLOC_CTX *mem_ctx,
struct dcerpc_pipe *p,
const char *uuid,
uint_t version)
{
struct dcerpc_syntax_id syntax;
struct dcerpc_syntax_id transfer_syntax;
struct composite_context *c;
c = talloc_zero(mem_ctx, struct composite_context);
if (c == NULL) return NULL;
c->status = dcerpc_init_syntaxes(uuid, &syntax, &transfer_syntax,
version);
if (!NT_STATUS_IS_OK(c->status)) {
DEBUG(2,("Invalid uuid string in "
"dcerpc_bind_auth_none_send\n"));
composite_trigger_error(c);
return c;
}
/* c was only allocated as a container for a possible error */
talloc_free(c);
return dcerpc_bind_send(p, mem_ctx, &syntax, &transfer_syntax);
}
NTSTATUS dcerpc_bind_auth_none_recv(struct composite_context *ctx)
{
return dcerpc_bind_recv(ctx);
}
NTSTATUS dcerpc_bind_auth_none(struct dcerpc_pipe *p,
const char *uuid, uint_t version)
{
struct composite_context *ctx;
ctx = dcerpc_bind_auth_none_send(p, p, uuid, version);
return dcerpc_bind_auth_none_recv(ctx);
}
/*
perform a multi-part authenticated bind
*/
static NTSTATUS dcerpc_bind_auth(struct dcerpc_pipe *p, uint8_t auth_type, uint8_t auth_level,
const char *uuid, uint_t version)
{
NTSTATUS status;
TALLOC_CTX *tmp_ctx = talloc_new(p);
DATA_BLOB credentials;
DATA_BLOB null_data_blob = data_blob(NULL, 0);
int num_passes = 0;
if (!p->conn->security_state.generic_state) {
status = gensec_client_start(p, &p->conn->security_state.generic_state,
p->conn->event_ctx);
if (!NT_STATUS_IS_OK(status)) goto done;
status = gensec_start_mech_by_authtype(p->conn->security_state.generic_state,
auth_type, auth_level);
if (!NT_STATUS_IS_OK(status)) goto done;
}
p->conn->security_state.auth_info = talloc(p, struct dcerpc_auth);
if (!p->conn->security_state.auth_info) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
p->conn->security_state.auth_info->auth_type = auth_type;
p->conn->security_state.auth_info->auth_level = auth_level;
p->conn->security_state.auth_info->auth_pad_length = 0;
p->conn->security_state.auth_info->auth_reserved = 0;
p->conn->security_state.auth_info->auth_context_id = random();
p->conn->security_state.auth_info->credentials = null_data_blob;
while (1) {
num_passes++;
status = gensec_update(p->conn->security_state.generic_state, tmp_ctx,
p->conn->security_state.auth_info->credentials,
&credentials);
/* The status value here, from GENSEC is vital to the security
* of the system. Even if the other end accepts, if GENSEC
* claims 'MORE_PROCESSING_REQUIRED' then you must keep
* feeding it blobs, or else the remote host/attacker might
* avoid mutal authentication requirements.
*
* Likewise, you must not feed GENSEC too much (after the OK),
* it doesn't like that either
*/
if (!NT_STATUS_IS_OK(status)
&& !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(1, ("Failed DCERPC client gensec_update with mechanism %s: %s\n",
gensec_get_name_by_authtype(auth_type), nt_errstr(status)));
break;
}
if (!credentials.length) {
break;
}
p->conn->security_state.auth_info->credentials = credentials;
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
if (num_passes == 1) {
status = dcerpc_bind_byuuid(p, tmp_ctx, uuid, version);
} else {
/* We are demanding a reply, so use a request that will get us one */
status = dcerpc_alter_context(p, tmp_ctx, &p->syntax, &p->transfer_syntax);
}
if (!NT_STATUS_IS_OK(status)) {
break;
}
} else if (NT_STATUS_IS_OK(status)) {
/* NO reply expected, so just send it */
if (num_passes == 1) {
status = dcerpc_bind_byuuid(p, tmp_ctx, uuid, version);
} else {
status = dcerpc_auth3(p->conn, tmp_ctx);
}
break;
} else {
break;
}
};
done:
talloc_free(tmp_ctx);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(p->conn->security_state.generic_state);
ZERO_STRUCT(p->conn->security_state);
} else {
/* Authenticated connections use the generic session key */
p->conn->security_state.session_key = dcerpc_generic_session_key;
}
return status;
}
/*
setup GENSEC on a DCE-RPC pipe
*/
NTSTATUS dcerpc_bind_auth_password(struct dcerpc_pipe *p,
const char *uuid, uint_t version,
struct cli_credentials *credentials,
uint8_t auth_type,
const char *service)
{
NTSTATUS status;
if (!(p->conn->flags & (DCERPC_SIGN | DCERPC_SEAL))) {
p->conn->flags |= DCERPC_CONNECT;
}
status = gensec_client_start(p, &p->conn->security_state.generic_state,
p->conn->event_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC client mode: %s\n", nt_errstr(status)));
return status;
}
status = gensec_set_credentials(p->conn->security_state.generic_state,
credentials);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start set GENSEC client credentails: %s\n",
nt_errstr(status)));
return status;
}
status = gensec_set_target_hostname(p->conn->security_state.generic_state,
p->conn->transport.peer_name(p->conn));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start set GENSEC target hostname: %s\n",
nt_errstr(status)));
return status;
}
if (service) {
status = gensec_set_target_service(p->conn->security_state.generic_state, service);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start set GENSEC target service: %s\n",
nt_errstr(status)));
return status;
}
}
status = gensec_start_mech_by_authtype(p->conn->security_state.generic_state,
auth_type,
dcerpc_auth_level(p->conn));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
gensec_get_name_by_authtype(auth_type), nt_errstr(status)));
return status;
}
status = dcerpc_bind_auth(p, auth_type,
dcerpc_auth_level(p->conn),
uuid, version);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(2, ("Failed to bind to pipe with %s: %s\n",
gensec_get_name_by_authtype(auth_type), nt_errstr(status)));
return status;
}
return status;
}
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