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samba-mirror/source4/rpc_server/dcesrv_auth.c
Andrew Bartlett 2d6066dbbf gensec: Add gensec_{get,set}_target_service_description()
This allows a free text description of what the server-side service is for logging
purposes where the various services may be using the same Kerberos service or not
use Kerberos.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Pair-Programmed-by: Gary Lockyer <gary@catalyst.net.nz>
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
2017-03-29 02:37:25 +02:00

563 lines
16 KiB
C

/*
Unix SMB/CIFS implementation.
server side dcerpc authentication code
Copyright (C) Andrew Tridgell 2003
Copyright (C) Stefan (metze) 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 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/dcerpc_server.h"
#include "rpc_server/dcerpc_server_proto.h"
#include "rpc_server/common/proto.h"
#include "librpc/rpc/dcerpc_proto.h"
#include "librpc/gen_ndr/ndr_dcerpc.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/auth.h"
#include "param/param.h"
#include "librpc/rpc/rpc_common.h"
/*
parse any auth information from a dcerpc bind request
return false if we can't handle the auth request for some
reason (in which case we send a bind_nak)
*/
bool dcesrv_auth_bind(struct dcesrv_call_state *call)
{
struct cli_credentials *server_credentials = NULL;
struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
struct dcesrv_auth *auth = &dce_conn->auth_state;
NTSTATUS status;
if (pkt->auth_length == 0) {
auth->auth_type = DCERPC_AUTH_TYPE_NONE;
auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
auth->auth_context_id = 0;
return true;
}
status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.bind.auth_info,
&call->in_auth_info,
NULL, true);
if (!NT_STATUS_IS_OK(status)) {
/*
* Setting DCERPC_AUTH_LEVEL_NONE,
* gives the caller the reject_reason
* as auth_context_id.
*
* Note: DCERPC_AUTH_LEVEL_NONE == 1
*/
auth->auth_type = DCERPC_AUTH_TYPE_NONE;
auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
auth->auth_context_id =
DCERPC_BIND_NAK_REASON_PROTOCOL_VERSION_NOT_SUPPORTED;
return false;
}
switch (call->in_auth_info.auth_level) {
case DCERPC_AUTH_LEVEL_CONNECT:
case DCERPC_AUTH_LEVEL_CALL:
case DCERPC_AUTH_LEVEL_PACKET:
case DCERPC_AUTH_LEVEL_INTEGRITY:
case DCERPC_AUTH_LEVEL_PRIVACY:
/*
* We evaluate auth_type only if auth_level was valid
*/
break;
default:
/*
* Setting DCERPC_AUTH_LEVEL_NONE,
* gives the caller the reject_reason
* as auth_context_id.
*
* Note: DCERPC_AUTH_LEVEL_NONE == 1
*/
auth->auth_type = DCERPC_AUTH_TYPE_NONE;
auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
auth->auth_context_id = DCERPC_BIND_NAK_REASON_NOT_SPECIFIED;
return false;
}
auth->auth_type = call->in_auth_info.auth_type;
auth->auth_level = call->in_auth_info.auth_level;
auth->auth_context_id = call->in_auth_info.auth_context_id;
server_credentials
= cli_credentials_init(call);
if (!server_credentials) {
DEBUG(1, ("Failed to init server credentials\n"));
return false;
}
cli_credentials_set_conf(server_credentials, call->conn->dce_ctx->lp_ctx);
status = cli_credentials_set_machine_account(server_credentials, call->conn->dce_ctx->lp_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to obtain server credentials: %s\n",
nt_errstr(status)));
return false;
}
status = samba_server_gensec_start(dce_conn, call->event_ctx,
call->msg_ctx,
call->conn->dce_ctx->lp_ctx,
server_credentials,
NULL,
&auth->gensec_security);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to call samba_server_gensec_start %s\n",
nt_errstr(status)));
return false;
}
/*
* We have to call this because we set the target_service for
* Kerberos to NULL above, and in any case we wish to log a
* more specific service target.
*
*/
status = gensec_set_target_service_description(auth->gensec_security,
"DCE/RPC");
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to call gensec_set_target_service_description %s\n",
nt_errstr(status)));
return false;
}
if (call->conn->remote_address != NULL) {
status = gensec_set_remote_address(auth->gensec_security,
call->conn->remote_address);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to call gensec_set_remote_address() %s\n",
nt_errstr(status)));
return false;
}
}
status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_type,
auth->auth_level);
if (!NT_STATUS_IS_OK(status)) {
const char *backend_name =
gensec_get_name_by_authtype(auth->gensec_security,
auth->auth_type);
DEBUG(3, ("Failed to start GENSEC mechanism for DCERPC server: "
"auth_type=%d (%s), auth_level=%d: %s\n",
(int)auth->auth_type, backend_name,
(int)auth->auth_level,
nt_errstr(status)));
/*
* Setting DCERPC_AUTH_LEVEL_NONE,
* gives the caller the reject_reason
* as auth_context_id.
*
* Note: DCERPC_AUTH_LEVEL_NONE == 1
*/
auth->auth_type = DCERPC_AUTH_TYPE_NONE;
auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
if (backend_name != NULL) {
auth->auth_context_id =
DCERPC_BIND_NAK_REASON_INVALID_CHECKSUM;
} else {
auth->auth_context_id =
DCERPC_BIND_NAK_REASON_INVALID_AUTH_TYPE;
}
return false;
}
return true;
}
/*
add any auth information needed in a bind ack, and process the authentication
information found in the bind.
*/
NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
bool want_header_signing = false;
dce_conn->allow_alter = true;
dce_conn->allow_auth3 = true;
if (call->pkt.auth_length == 0) {
dce_conn->auth_state.auth_finished = true;
dce_conn->allow_request = true;
return NT_STATUS_OK;
}
/* We can't work without an existing gensec state */
if (!call->conn->auth_state.gensec_security) {
return NT_STATUS_INTERNAL_ERROR;
}
if (call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) {
dce_conn->auth_state.client_hdr_signing = true;
want_header_signing = true;
}
if (!lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","header signing", true)) {
want_header_signing = false;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = dce_conn->auth_state.auth_type,
.auth_level = dce_conn->auth_state.auth_level,
.auth_context_id = dce_conn->auth_state.auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
status = gensec_update_ev(dce_conn->auth_state.gensec_security,
call, call->event_ctx,
call->in_auth_info.credentials,
&call->out_auth_info->credentials);
if (NT_STATUS_IS_OK(status)) {
status = gensec_session_info(dce_conn->auth_state.gensec_security,
dce_conn,
&dce_conn->auth_state.session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
return status;
}
dce_conn->auth_state.auth_finished = true;
dce_conn->allow_request = true;
if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER))
{
want_header_signing = false;
}
if (want_header_signing) {
gensec_want_feature(dce_conn->auth_state.gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER);
dce_conn->auth_state.hdr_signing = true;
pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
}
/* Now that we are authenticated, go back to the generic session key... */
dce_conn->auth_state.session_key = dcesrv_generic_session_key;
return NT_STATUS_OK;
} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER))
{
want_header_signing = false;
}
if (want_header_signing) {
gensec_want_feature(dce_conn->auth_state.gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER);
dce_conn->auth_state.hdr_signing = true;
pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
}
return NT_STATUS_OK;
} else {
DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_ack: %s\n",
nt_errstr(status)));
return status;
}
}
/*
process the final stage of a auth request
*/
bool dcesrv_auth_auth3(struct dcesrv_call_state *call)
{
struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
if (pkt->auth_length == 0) {
return false;
}
if (dce_conn->auth_state.auth_finished) {
return false;
}
/* We can't work without an existing gensec state */
if (!dce_conn->auth_state.gensec_security) {
return false;
}
status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.auth3.auth_info,
&call->in_auth_info, NULL, true);
if (!NT_STATUS_IS_OK(status)) {
/*
* Windows returns DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY
* instead of DCERPC_NCA_S_PROTO_ERROR.
*/
call->fault_code = DCERPC_NCA_S_FAULT_REMOTE_NO_MEMORY;
return false;
}
if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
return false;
}
if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
return false;
}
if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
return false;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = dce_conn->auth_state.auth_type,
.auth_level = dce_conn->auth_state.auth_level,
.auth_context_id = dce_conn->auth_state.auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
/* Pass the extra data we got from the client down to gensec for processing */
status = gensec_update_ev(dce_conn->auth_state.gensec_security,
call, call->event_ctx,
call->in_auth_info.credentials,
&call->out_auth_info->credentials);
if (NT_STATUS_IS_OK(status)) {
status = gensec_session_info(dce_conn->auth_state.gensec_security,
dce_conn,
&dce_conn->auth_state.session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
return false;
}
dce_conn->auth_state.auth_finished = true;
dce_conn->allow_request = true;
/* Now that we are authenticated, go back to the generic session key... */
dce_conn->auth_state.session_key = dcesrv_generic_session_key;
if (call->out_auth_info->credentials.length != 0) {
DEBUG(4, ("GENSEC produced output token (len=%u) at bind_auth3\n",
(unsigned)call->out_auth_info->credentials.length));
return false;
}
return true;
} else {
DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
nt_errstr(status)));
return false;
}
}
/*
parse any auth information from a dcerpc alter request
return false if we can't handle the auth request for some
reason (in which case we send a bind_nak (is this true for here?))
*/
bool dcesrv_auth_alter(struct dcesrv_call_state *call)
{
struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
/* on a pure interface change there is no auth blob */
if (pkt->auth_length == 0) {
if (!dce_conn->auth_state.auth_finished) {
return false;
}
return true;
}
if (dce_conn->auth_state.auth_finished) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
return false;
}
/* We can't work without an existing gensec state */
if (!dce_conn->auth_state.gensec_security) {
return false;
}
status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
&call->in_auth_info, NULL, true);
if (!NT_STATUS_IS_OK(status)) {
call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
return false;
}
if (call->in_auth_info.auth_type == DCERPC_AUTH_TYPE_NONE) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
return false;
}
if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
return false;
}
if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
return false;
}
if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
return false;
}
return true;
}
/*
add any auth information needed in a alter ack, and process the authentication
information found in the alter.
*/
NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
/* on a pure interface change there is no auth_info structure
setup */
if (call->pkt.auth_length == 0) {
return NT_STATUS_OK;
}
if (!call->conn->auth_state.gensec_security) {
return NT_STATUS_INTERNAL_ERROR;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = dce_conn->auth_state.auth_type,
.auth_level = dce_conn->auth_state.auth_level,
.auth_context_id = dce_conn->auth_state.auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
status = gensec_update_ev(dce_conn->auth_state.gensec_security,
call, call->event_ctx,
call->in_auth_info.credentials,
&call->out_auth_info->credentials);
if (NT_STATUS_IS_OK(status)) {
status = gensec_session_info(dce_conn->auth_state.gensec_security,
dce_conn,
&dce_conn->auth_state.session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
return status;
}
dce_conn->auth_state.auth_finished = true;
dce_conn->allow_request = true;
/* Now that we are authenticated, got back to the generic session key... */
dce_conn->auth_state.session_key = dcesrv_generic_session_key;
return NT_STATUS_OK;
} else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
return NT_STATUS_OK;
}
DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
nt_errstr(status)));
return status;
}
/*
check credentials on a packet
*/
bool dcesrv_auth_pkt_pull(struct dcesrv_call_state *call,
DATA_BLOB *full_packet,
uint8_t required_flags,
uint8_t optional_flags,
uint8_t payload_offset,
DATA_BLOB *payload_and_verifier)
{
struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
const struct dcerpc_auth tmp_auth = {
.auth_type = dce_conn->auth_state.auth_type,
.auth_level = dce_conn->auth_state.auth_level,
.auth_context_id = dce_conn->auth_state.auth_context_id,
};
NTSTATUS status;
if (!dce_conn->allow_request) {
call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
return false;
}
if (dce_conn->auth_state.auth_invalid) {
return false;
}
status = dcerpc_ncacn_pull_pkt_auth(&tmp_auth,
dce_conn->auth_state.gensec_security,
call,
pkt->ptype,
required_flags,
optional_flags,
payload_offset,
payload_and_verifier,
full_packet,
pkt);
if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_PROTOCOL_ERROR)) {
call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
return false;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_UNSUPPORTED_AUTHN_LEVEL)) {
call->fault_code = DCERPC_NCA_S_UNSUPPORTED_AUTHN_LEVEL;
return false;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_SEC_PKG_ERROR)) {
call->fault_code = DCERPC_FAULT_SEC_PKG_ERROR;
return false;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
return false;
}
if (!NT_STATUS_IS_OK(status)) {
return false;
}
return true;
}
/*
push a signed or sealed dcerpc request packet into a blob
*/
bool dcesrv_auth_pkt_push(struct dcesrv_call_state *call,
DATA_BLOB *blob, size_t sig_size,
uint8_t payload_offset,
const DATA_BLOB *payload,
const struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
const struct dcerpc_auth tmp_auth = {
.auth_type = dce_conn->auth_state.auth_type,
.auth_level = dce_conn->auth_state.auth_level,
.auth_context_id = dce_conn->auth_state.auth_context_id,
};
NTSTATUS status;
status = dcerpc_ncacn_push_pkt_auth(&tmp_auth,
dce_conn->auth_state.gensec_security,
call, blob, sig_size,
payload_offset,
payload,
pkt);
return NT_STATUS_IS_OK(status);
}