1
0
mirror of https://github.com/samba-team/samba.git synced 2024-12-24 21:34:56 +03:00
samba-mirror/librpc/rpc/dcesrv_auth.c
Joseph Sutton dc3bcd5e78 librpc: Fix typo
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-08-08 04:39:37 +00:00

704 lines
17 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 "librpc/rpc/dcesrv_core.h"
#include "librpc/rpc/dcesrv_core_proto.h"
#include "librpc/rpc/dcerpc_util.h"
#include "librpc/rpc/dcerpc_pkt_auth.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"
static NTSTATUS dcesrv_auth_negotiate_hdr_signing(struct dcesrv_call_state *call,
struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
struct dcesrv_auth *a = NULL;
if (!(call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN)) {
return NT_STATUS_OK;
}
if (dce_conn->client_hdr_signing) {
if (dce_conn->negotiated_hdr_signing && pkt != NULL) {
pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
}
return NT_STATUS_OK;
}
dce_conn->client_hdr_signing = true;
dce_conn->negotiated_hdr_signing = dce_conn->support_hdr_signing;
if (!dce_conn->negotiated_hdr_signing) {
return NT_STATUS_OK;
}
if (pkt != NULL) {
pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
}
a = call->conn->default_auth_state;
if (a->gensec_security != NULL) {
gensec_want_feature(a->gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER);
}
for (a = call->conn->auth_states; a != NULL; a = a->next) {
if (a->gensec_security == NULL) {
continue;
}
gensec_want_feature(a->gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER);
}
return NT_STATUS_OK;
}
static bool dcesrv_auth_prepare_gensec(struct dcesrv_call_state *call)
{
struct dcesrv_connection *dce_conn = call->conn;
struct dcesrv_auth *auth = call->auth_state;
struct dcesrv_context_callbacks *cb = call->conn->dce_ctx->callbacks;
NTSTATUS status;
if (auth->auth_started) {
return false;
}
auth->auth_started = true;
if (auth->auth_invalid) {
return false;
}
if (auth->auth_finished) {
return false;
}
if (auth->gensec_security != NULL) {
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;
cb->auth.become_root();
status = cb->auth.gensec_prepare(
auth,
call,
&auth->gensec_security,
cb->auth.private_data);
cb->auth.unbecome_root();
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;
}
}
if (call->conn->local_address != NULL) {
status = gensec_set_local_address(auth->gensec_security,
call->conn->local_address);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to call gensec_set_local_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;
}
if (dce_conn->negotiated_hdr_signing) {
gensec_want_feature(auth->gensec_security,
GENSEC_FEATURE_SIGN_PKT_HEADER);
}
return true;
}
static void dcesrv_default_auth_state_finish_bind(struct dcesrv_call_state *call)
{
SMB_ASSERT(call->pkt.ptype == DCERPC_PKT_BIND);
if (call->auth_state == call->conn->default_auth_state) {
return;
}
if (call->conn->default_auth_state->auth_started) {
return;
}
if (call->conn->default_auth_state->auth_invalid) {
return;
}
call->conn->default_auth_state->auth_type = DCERPC_AUTH_TYPE_NONE;
call->conn->default_auth_state->auth_level = DCERPC_AUTH_LEVEL_NONE;
call->conn->default_auth_state->auth_context_id = 0;
call->conn->default_auth_state->auth_started = true;
call->conn->default_auth_state->auth_finished = true;
/*
*
* We defer log_successful_dcesrv_authz_event()
* to dcesrv_default_auth_state_prepare_request()
*
* As we don't want to trigger authz_events
* just for alter_context requests without authentication
*/
}
void dcesrv_default_auth_state_prepare_request(struct dcesrv_call_state *call)
{
struct dcesrv_connection *dce_conn = call->conn;
struct dcesrv_auth *auth = call->auth_state;
struct dcesrv_context_callbacks *cb = call->conn->dce_ctx->callbacks;
if (auth->auth_audited) {
return;
}
if (call->pkt.ptype != DCERPC_PKT_REQUEST) {
return;
}
if (auth != dce_conn->default_auth_state) {
return;
}
if (auth->auth_invalid) {
return;
}
if (!auth->auth_finished) {
return;
}
if (cb->log.successful_authz == NULL) {
return;
}
cb->log.successful_authz(call, cb->log.private_data);
}
/*
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 ncacn_packet *pkt = &call->pkt;
struct dcesrv_auth *auth = call->auth_state;
struct dcesrv_context_callbacks *cb = call->conn->dce_ctx->callbacks;
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;
auth->auth_started = true;
if (cb->log.successful_authz != NULL) {
cb->log.successful_authz(call, cb->log.private_data);
}
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;
}
return dcesrv_auth_prepare_gensec(call);
}
NTSTATUS dcesrv_auth_complete(struct dcesrv_call_state *call, NTSTATUS status)
{
struct dcesrv_auth *auth = call->auth_state;
struct dcesrv_context_callbacks *cb = call->conn->dce_ctx->callbacks;
const char *pdu = "<unknown>";
switch (call->pkt.ptype) {
case DCERPC_PKT_BIND:
pdu = "BIND";
break;
case DCERPC_PKT_ALTER:
pdu = "ALTER";
break;
case DCERPC_PKT_AUTH3:
pdu = "AUTH3";
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(4, ("GENSEC not finished at %s\n", pdu));
return NT_STATUS_RPC_SEC_PKG_ERROR;
}
break;
default:
return NT_STATUS_INTERNAL_ERROR;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
return NT_STATUS_OK;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(4, ("GENSEC mech rejected the incoming authentication "
"at %s: %s\n", pdu, nt_errstr(status)));
return status;
}
cb->auth.become_root();
status = gensec_session_info(auth->gensec_security,
auth,
&auth->session_info);
cb->auth.unbecome_root();
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to establish session_info: %s\n",
nt_errstr(status)));
return status;
}
auth->auth_finished = true;
if (auth->auth_level == DCERPC_AUTH_LEVEL_CONNECT &&
!call->conn->got_explicit_auth_level_connect)
{
call->conn->default_auth_level_connect = auth;
}
if (call->pkt.ptype != DCERPC_PKT_AUTH3) {
return NT_STATUS_OK;
}
if (call->out_auth_info->credentials.length != 0) {
DEBUG(4, ("GENSEC produced output token (len=%zu) at %s\n",
call->out_auth_info->credentials.length, pdu));
return NT_STATUS_RPC_SEC_PKG_ERROR;
}
return NT_STATUS_OK;
}
/*
add any auth information needed in a bind ack, and process the authentication
information found in the bind.
*/
NTSTATUS dcesrv_auth_prepare_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
struct dcesrv_auth *auth = call->auth_state;
NTSTATUS status;
status = dcesrv_auth_negotiate_hdr_signing(call, pkt);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
dce_conn->allow_alter = true;
dcesrv_default_auth_state_finish_bind(call);
if (call->pkt.auth_length == 0) {
auth->auth_finished = true;
return NT_STATUS_OK;
}
/* We can't work without an existing gensec state */
if (auth->gensec_security == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = auth->auth_type,
.auth_level = auth->auth_level,
.auth_context_id = auth->auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
return NT_STATUS_OK;
}
/*
process the final stage of a auth request
*/
bool dcesrv_auth_prepare_auth3(struct dcesrv_call_state *call)
{
struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_auth *auth = call->auth_state;
NTSTATUS status;
if (pkt->auth_length == 0) {
return false;
}
if (auth->auth_finished) {
return false;
}
if (auth->auth_invalid) {
return false;
}
/* We can't work without an existing gensec state */
if (auth->gensec_security == NULL) {
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 != auth->auth_type) {
return false;
}
if (call->in_auth_info.auth_level != auth->auth_level) {
return false;
}
if (call->in_auth_info.auth_context_id != auth->auth_context_id) {
return false;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = auth->auth_type,
.auth_level = auth->auth_level,
.auth_context_id = auth->auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
return true;
}
/*
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_auth *auth = call->auth_state;
NTSTATUS status;
/* on a pure interface change there is no auth blob */
if (pkt->auth_length == 0) {
if (!auth->auth_finished) {
return false;
}
return true;
}
if (auth->auth_finished) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
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 (!auth->auth_started) {
bool ok;
ok = dcesrv_auth_prepare_gensec(call);
if (!ok) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
return false;
}
return true;
}
if (call->in_auth_info.auth_type == DCERPC_AUTH_TYPE_NONE) {
call->fault_code = DCERPC_FAULT_ACCESS_DENIED;
return false;
}
if (auth->auth_invalid) {
return false;
}
if (call->in_auth_info.auth_type != auth->auth_type) {
return false;
}
if (call->in_auth_info.auth_level != auth->auth_level) {
return false;
}
if (call->in_auth_info.auth_context_id != auth->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_prepare_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
{
struct dcesrv_auth *auth = call->auth_state;
NTSTATUS status;
status = dcesrv_auth_negotiate_hdr_signing(call, pkt);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/* on a pure interface change there is no auth_info structure
setup */
if (call->pkt.auth_length == 0) {
return NT_STATUS_OK;
}
if (auth->gensec_security == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
call->_out_auth_info = (struct dcerpc_auth) {
.auth_type = auth->auth_type,
.auth_level = auth->auth_level,
.auth_context_id = auth->auth_context_id,
};
call->out_auth_info = &call->_out_auth_info;
return NT_STATUS_OK;
}
/*
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_auth *auth = call->auth_state;
const struct dcerpc_auth tmp_auth = {
.auth_type = auth->auth_type,
.auth_level = auth->auth_level,
.auth_context_id = auth->auth_context_id,
};
bool check_pkt_auth_fields;
NTSTATUS status;
if (!auth->auth_started) {
return false;
}
if (!auth->auth_finished) {
call->fault_code = DCERPC_NCA_S_PROTO_ERROR;
return false;
}
if (auth->auth_invalid) {
return false;
}
if (call->pkt.pfc_flags & DCERPC_PFC_FLAG_FIRST) {
/*
* The caller most likely checked this
* already, but we better double check.
*/
check_pkt_auth_fields = true;
} else {
/*
* The caller already found first fragment
* and is passing the auth_state of it.
* A server is supposed to use the
* setting of the first fragment and
* completely ignore the values
* on the remaining fragments
*/
check_pkt_auth_fields = false;
}
status = dcerpc_ncacn_pull_pkt_auth(&tmp_auth,
auth->gensec_security,
check_pkt_auth_fields,
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_auth *auth = call->auth_state;
const struct dcerpc_auth tmp_auth = {
.auth_type = auth->auth_type,
.auth_level = auth->auth_level,
.auth_context_id = auth->auth_context_id,
};
NTSTATUS status;
status = dcerpc_ncacn_push_pkt_auth(&tmp_auth,
auth->gensec_security,
call, blob, sig_size,
payload_offset,
payload,
pkt);
return NT_STATUS_IS_OK(status);
}