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 2 of the License, or
+ 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,
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.
+ 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 "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"
/*
parse any auth information from a dcerpc bind request
- return False if we can't handle the auth request for some
+ 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)
+bool dcesrv_auth_bind(struct dcesrv_call_state *call)
{
- struct dcerpc_packet *pkt = &call->pkt;
+ struct cli_credentials *server_credentials;
+ struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
+ struct dcesrv_auth *auth = &dce_conn->auth_state;
NTSTATUS status;
+ uint32_t auth_length;
if (pkt->u.bind.auth_info.length == 0) {
dce_conn->auth_state.auth_info = NULL;
- return True;
+ return true;
}
- dce_conn->auth_state.auth_info = talloc_p(dce_conn->mem_ctx, struct dcerpc_auth);
+ dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
if (!dce_conn->auth_state.auth_info) {
- return False;
+ return false;
}
- status = ndr_pull_struct_blob(&pkt->u.bind.auth_info,
- call->mem_ctx,
- dce_conn->auth_state.auth_info,
- (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
+ status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.bind.auth_info,
+ dce_conn->auth_state.auth_info,
+ &auth_length, false);
+ 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)) {
- return False;
+ DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
+ talloc_free(server_credentials);
+ server_credentials = NULL;
}
- status = dcesrv_crypto_select_type(dce_conn, &dce_conn->auth_state);
+ 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);
+
+ status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_info->auth_type,
+ auth->auth_info->auth_level);
+
if (!NT_STATUS_IS_OK(status)) {
- return False;
+ DEBUG(1, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
+ (int)auth->auth_info->auth_type,
+ (int)auth->auth_info->auth_level,
+ nt_errstr(status)));
+ return false;
}
- status = dcesrv_crypto_start(&dce_conn->auth_state);
- if (!NT_STATUS_IS_OK(status)) {
- return False;
+ if (call->conn->state_flags & DCESRV_CALL_STATE_FLAG_HEADER_SIGNING) {
+ gensec_want_feature(auth->gensec_security, GENSEC_FEATURE_SIGN_PKT_HEADER);
}
- return True;
+ return true;
}
/*
- add any auth information needed in a bind ack
+ add any auth information needed in a bind ack, and process the authentication
+ information found in the bind.
*/
-BOOL dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct dcerpc_packet *pkt)
+NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
- if (!call->conn->auth_state.crypto_ctx.ops) {
- return True;
+ if (!call->conn->auth_state.gensec_security) {
+ return NT_STATUS_OK;
}
- status = dcesrv_crypto_update(&dce_conn->auth_state,
- call->mem_ctx,
- dce_conn->auth_state.auth_info->credentials,
- &dce_conn->auth_state.auth_info->credentials);
- if (!NT_STATUS_IS_OK(status) &&
- !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+ status = gensec_update(dce_conn->auth_state.gensec_security,
+ call,
+ dce_conn->auth_state.auth_info->credentials,
+ &dce_conn->auth_state.auth_info->credentials);
+
+ if (NT_STATUS_IS_OK(status)) {
+ status = gensec_session_info(dce_conn->auth_state.gensec_security,
+ &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;
+ }
+
+ if (dce_conn->state_flags & DCESRV_CALL_STATE_FLAG_HEADER_SIGNING) {
+ gensec_want_feature(dce_conn->auth_state.gensec_security,
+ GENSEC_FEATURE_SIGN_PKT_HEADER);
+ }
+
+ /* 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)) {
+ dce_conn->auth_state.auth_info->auth_pad_length = 0;
+ dce_conn->auth_state.auth_info->auth_reserved = 0;
+ return NT_STATUS_OK;
+ } else {
DEBUG(2, ("Failed to start dcesrv auth negotiate: %s\n", nt_errstr(status)));
- return False;
+ return status;
}
-
- dce_conn->auth_state.auth_info->auth_pad_length = 0;
- dce_conn->auth_state.auth_info->auth_reserved = 0;
-
- return True;
}
/*
process the final stage of a auth request
*/
-BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
+bool dcesrv_auth_auth3(struct dcesrv_call_state *call)
{
- struct dcerpc_packet *pkt = &call->pkt;
+ struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
+ uint32_t auth_length;
+ /* We can't work without an existing gensec state, and an new blob to feed it */
if (!dce_conn->auth_state.auth_info ||
- !dce_conn->auth_state.crypto_ctx.ops ||
- pkt->u.auth.auth_info.length == 0) {
- return False;
+ !dce_conn->auth_state.gensec_security ||
+ pkt->u.auth3.auth_info.length == 0) {
+ return false;
}
- status = ndr_pull_struct_blob(&pkt->u.auth.auth_info,
- call->mem_ctx,
- dce_conn->auth_state.auth_info,
- (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
+ status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.auth3.auth_info,
+ dce_conn->auth_state.auth_info, &auth_length, true);
if (!NT_STATUS_IS_OK(status)) {
- return False;
+ return false;
}
- status = dcesrv_crypto_update(&dce_conn->auth_state,
- call->mem_ctx,
- dce_conn->auth_state.auth_info->credentials,
- &dce_conn->auth_state.auth_info->credentials);
- if (!NT_STATUS_IS_OK(status)) {
+ /* Pass the extra data we got from the client down to gensec for processing */
+ status = gensec_update(dce_conn->auth_state.gensec_security,
+ call,
+ dce_conn->auth_state.auth_info->credentials,
+ &dce_conn->auth_state.auth_info->credentials);
+ if (NT_STATUS_IS_OK(status)) {
+ status = gensec_session_info(dce_conn->auth_state.gensec_security,
+ &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;
+ }
+ /* Now that we are authenticated, go back to the generic session key... */
+ dce_conn->auth_state.session_key = dcesrv_generic_session_key;
+ return true;
+ } else {
DEBUG(4, ("dcesrv_auth_auth3: failed to authenticate: %s\n",
nt_errstr(status)));
- return False;
+ return false;
+ }
+
+ 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_connection *dce_conn = call->conn;
+ NTSTATUS status;
+ uint32_t auth_length;
+
+ /* on a pure interface change there is no auth blob */
+ if (pkt->u.alter.auth_info.length == 0) {
+ return true;
+ }
+
+ /* We can't work without an existing gensec state */
+ if (!dce_conn->auth_state.gensec_security) {
+ return false;
+ }
+
+ dce_conn->auth_state.auth_info = talloc(dce_conn, struct dcerpc_auth);
+ if (!dce_conn->auth_state.auth_info) {
+ return false;
+ }
+
+ status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
+ dce_conn->auth_state.auth_info,
+ &auth_length, true);
+ if (!NT_STATUS_IS_OK(status)) {
+ return false;
}
- return True;
+ 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->conn->auth_state.auth_info ||
+ dce_conn->auth_state.auth_info->credentials.length == 0) {
+ return NT_STATUS_OK;
+ }
+
+ if (!call->conn->auth_state.gensec_security) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ status = gensec_update(dce_conn->auth_state.gensec_security,
+ call,
+ dce_conn->auth_state.auth_info->credentials,
+ &dce_conn->auth_state.auth_info->credentials);
+
+ if (NT_STATUS_IS_OK(status)) {
+ status = gensec_session_info(dce_conn->auth_state.gensec_security,
+ &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;
+ }
+
+ /* 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)) {
+ dce_conn->auth_state.auth_info->auth_pad_length = 0;
+ dce_conn->auth_state.auth_info->auth_reserved = 0;
+ return NT_STATUS_OK;
+ }
+
+ DEBUG(2, ("Failed to finish dcesrv auth alter_ack: %s\n", nt_errstr(status)));
+ return status;
+}
/*
check credentials on a request
*/
-BOOL dcesrv_auth_request(struct dcesrv_call_state *call)
+bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
{
- struct dcerpc_packet *pkt = &call->pkt;
+ struct ncacn_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
- DATA_BLOB auth_blob;
struct dcerpc_auth auth;
- struct ndr_pull *ndr;
NTSTATUS status;
+ uint32_t auth_length;
+ size_t hdr_size = DCERPC_REQUEST_LENGTH;
if (!dce_conn->auth_state.auth_info ||
- !dce_conn->auth_state.crypto_ctx.ops) {
- return True;
+ !dce_conn->auth_state.gensec_security) {
+ return true;
}
- auth_blob.length = 8 + pkt->auth_length;
-
- /* check for a valid length */
- if (pkt->u.request.stub_and_verifier.length < auth_blob.length) {
- return False;
+ if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
+ hdr_size += 16;
}
- auth_blob.data =
- pkt->u.request.stub_and_verifier.data +
- pkt->u.request.stub_and_verifier.length - auth_blob.length;
- pkt->u.request.stub_and_verifier.length -= auth_blob.length;
+ switch (dce_conn->auth_state.auth_info->auth_level) {
+ case DCERPC_AUTH_LEVEL_PRIVACY:
+ case DCERPC_AUTH_LEVEL_INTEGRITY:
+ break;
- /* pull the auth structure */
- ndr = ndr_pull_init_blob(&auth_blob, call->mem_ctx);
- if (!ndr) {
- return False;
- }
+ case DCERPC_AUTH_LEVEL_CONNECT:
+ if (pkt->auth_length != 0) {
+ break;
+ }
+ return true;
+ case DCERPC_AUTH_LEVEL_NONE:
+ if (pkt->auth_length != 0) {
+ return false;
+ }
+ return true;
- if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
- ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
+ default:
+ return false;
}
- status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
+ status = dcerpc_pull_auth_trailer(pkt, call,
+ &pkt->u.request.stub_and_verifier,
+ &auth, &auth_length, false);
if (!NT_STATUS_IS_OK(status)) {
- return False;
+ return false;
}
+ pkt->u.request.stub_and_verifier.length -= auth_length;
+
/* check signature or unseal the packet */
switch (dce_conn->auth_state.auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
- status = dcesrv_crypto_unseal(&dce_conn->auth_state,
- call->mem_ctx,
- pkt->u.request.stub_and_verifier.data,
+ status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
+ call,
+ full_packet->data + hdr_size,
pkt->u.request.stub_and_verifier.length,
+ full_packet->data,
+ full_packet->length-auth.credentials.length,
&auth.credentials);
+ memcpy(pkt->u.request.stub_and_verifier.data,
+ full_packet->data + hdr_size,
+ pkt->u.request.stub_and_verifier.length);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
- status = dcesrv_crypto_check_sig(&dce_conn->auth_state,
- call->mem_ctx,
- pkt->u.request.stub_and_verifier.data,
- pkt->u.request.stub_and_verifier.length,
- &auth.credentials);
+ status = gensec_check_packet(dce_conn->auth_state.gensec_security,
+ call,
+ pkt->u.request.stub_and_verifier.data,
+ pkt->u.request.stub_and_verifier.length,
+ full_packet->data,
+ full_packet->length-auth.credentials.length,
+ &auth.credentials);
+ break;
+
+ case DCERPC_AUTH_LEVEL_CONNECT:
+ /* for now we ignore possible signatures here */
+ status = NT_STATUS_OK;
break;
default:
break;
}
- /* remove the indicated amount of paddiing */
+ /* remove the indicated amount of padding */
if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
- return False;
+ return false;
}
pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
/*
push a signed or sealed dcerpc request packet into a blob
*/
-BOOL dcesrv_auth_response(struct dcesrv_call_state *call,
- DATA_BLOB *blob, struct dcerpc_packet *pkt)
+bool dcesrv_auth_response(struct dcesrv_call_state *call,
+ DATA_BLOB *blob, size_t sig_size,
+ struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
+ enum ndr_err_code ndr_err;
struct ndr_push *ndr;
+ uint32_t payload_length, offset;
+ DATA_BLOB creds2;
/* non-signed packets are simple */
- if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.crypto_ctx.ops) {
- status = dcerpc_push_auth(blob, call->mem_ctx, pkt, NULL);
+ if (sig_size == 0) {
+ status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
return NT_STATUS_IS_OK(status);
}
- ndr = ndr_push_init_ctx(call->mem_ctx);
+ switch (dce_conn->auth_state.auth_info->auth_level) {
+ case DCERPC_AUTH_LEVEL_PRIVACY:
+ case DCERPC_AUTH_LEVEL_INTEGRITY:
+ break;
+
+ case DCERPC_AUTH_LEVEL_CONNECT:
+ /*
+ * TODO: let the gensec mech decide if it wants to generate a signature
+ * that might be needed for schannel...
+ */
+ status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
+ return NT_STATUS_IS_OK(status);
+
+ case DCERPC_AUTH_LEVEL_NONE:
+ status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
+ return NT_STATUS_IS_OK(status);
+
+ default:
+ return false;
+ }
+
+ ndr = ndr_push_init_ctx(call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx));
if (!ndr) {
- return False;
+ return false;
}
- if (pkt->drep[0] & DCERPC_DREP_LE) {
+ if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
- status = ndr_push_dcerpc_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
- if (!NT_STATUS_IS_OK(status)) {
- return False;
+ ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return false;
+ }
+
+ /* pad to 16 byte multiple, match win2k3 */
+ offset = ndr->offset;
+ ndr_err = ndr_push_align(ndr, 16);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return false;
+ }
+ dce_conn->auth_state.auth_info->auth_pad_length = ndr->offset - offset;
+
+ payload_length = pkt->u.response.stub_and_verifier.length +
+ dce_conn->auth_state.auth_info->auth_pad_length;
+
+ /* we start without signature, it will appended later */
+ dce_conn->auth_state.auth_info->credentials = data_blob(NULL, 0);
+
+ /* add the auth verifier */
+ ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
+ dce_conn->auth_state.auth_info);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return false;
}
- /* pad to 8 byte multiple */
- dce_conn->auth_state.auth_info->auth_pad_length = NDR_ALIGN(ndr, 8);
- ndr_push_zero(ndr, dce_conn->auth_state.auth_info->auth_pad_length);
+ /* extract the whole packet as a blob */
+ *blob = ndr_push_blob(ndr);
+
+ /*
+ * Setup the frag and auth length in the packet buffer.
+ * This is needed if the GENSEC mech does AEAD signing
+ * of the packet headers. The signature itself will be
+ * appended later.
+ */
+ dcerpc_set_frag_length(blob, blob->length + sig_size);
+ dcerpc_set_auth_length(blob, sig_size);
/* sign or seal the packet */
switch (dce_conn->auth_state.auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
- status = dcesrv_crypto_seal(&dce_conn->auth_state,
- call->mem_ctx,
+ status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
+ call,
ndr->data + DCERPC_REQUEST_LENGTH,
- ndr->offset - DCERPC_REQUEST_LENGTH,
- &dce_conn->auth_state.auth_info->credentials);
+ payload_length,
+ blob->data,
+ blob->length,
+ &creds2);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
- status = dcesrv_crypto_sign(&dce_conn->auth_state,
- call->mem_ctx,
+ status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
+ call,
ndr->data + DCERPC_REQUEST_LENGTH,
- ndr->offset - DCERPC_REQUEST_LENGTH,
- &dce_conn->auth_state.auth_info->credentials);
+ payload_length,
+ blob->data,
+ blob->length,
+ &creds2);
break;
+
default:
status = NT_STATUS_INVALID_LEVEL;
break;
}
if (!NT_STATUS_IS_OK(status)) {
- return False;
+ return false;
}
- /* add the auth verifier */
- status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, dce_conn->auth_state.auth_info);
- if (!NT_STATUS_IS_OK(status)) {
- return False;
+ if (creds2.length != sig_size) {
+ DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
+ (unsigned)creds2.length, (uint32_t)sig_size,
+ (unsigned)dce_conn->auth_state.auth_info->auth_pad_length,
+ (unsigned)pkt->u.response.stub_and_verifier.length));
+ dcerpc_set_frag_length(blob, blob->length + creds2.length);
+ dcerpc_set_auth_length(blob, creds2.length);
}
- /* extract the whole packet as a blob */
- *blob = ndr_push_blob(ndr);
-
- /* fill in the fragment length and auth_length, we can't fill
- in these earlier as we don't know the signature length (it
- could be variable length) */
- dcerpc_set_frag_length(blob, blob->length);
- dcerpc_set_auth_length(blob, dce_conn->auth_state.auth_info->credentials.length);
-
- data_blob_free(&dce_conn->auth_state.auth_info->credentials);
+ if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
+ status = NT_STATUS_NO_MEMORY;
+ }
+ data_blob_free(&creds2);
- return True;
+ return true;
}
git.samba.org / ira / wip.git / blobdiff