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samba-mirror/source4/rpc_server/dcesrv_auth.c
Andrew Bartlett 5b0ab386cb r874: This patch is a pile of work on NTLMSSP:
Samba's NTLMSSP code is now fully talloc based, which should go a long
way to cleaning up the memory leaks in this code.  This also avoids a
lot of extra copies of data, as we now allocate the 'return' blobs on
a caller-supplied context.

I have also been doing a lot of work towards NTLM2 signing and
sealing.  I have this working for sealing, but not for the verifier
(MD5 integrity check on the stream) which is still incorrect.

(I can aim a rpcecho sinkdata from a Win2k3 box to my server, and the
data arrives intact, but the signature check fails.  It does however
match the test values I have...).

The new torture test is cludged in - when we get a unit test suite
back, I'll happliy put it in the 'right' place....

Andrew Bartlett
(This used to be commit 399e2e2b11)
2007-10-10 12:56:14 -05:00

305 lines
8.6 KiB
C

/*
Unix SMB/CIFS implementation.
server side dcerpc authentication code
Copyright (C) Andrew Tridgell 2003
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"
/*
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 dcerpc_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
if (pkt->u.bind.auth_info.length == 0) {
dce_conn->auth_state.auth_info = NULL;
return True;
}
dce_conn->auth_state.auth_info = talloc_p(dce_conn->mem_ctx, struct dcerpc_auth);
if (!dce_conn->auth_state.auth_info) {
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);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
if (dce_conn->auth_state.auth_info->auth_type != DCERPC_AUTH_TYPE_NTLMSSP) {
/* only do NTLMSSP for now */
DEBUG(2,("auth_type %d not supported\n", dce_conn->auth_state.auth_info->auth_type));
return False;
}
if (dce_conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_INTEGRITY &&
dce_conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY) {
DEBUG(2,("auth_level %d not supported\n", dce_conn->auth_state.auth_info->auth_level));
return False;
}
status = auth_ntlmssp_start(&dce_conn->auth_state.ntlmssp_state);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(2, ("Failed to start NTLMSSP subsystem!\n"));
return False;
}
return True;
}
/*
add any auth information needed in a bind ack
*/
BOOL dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct dcerpc_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
if (!call->conn->auth_state.ntlmssp_state) {
return True;
}
status = auth_ntlmssp_update(dce_conn->auth_state.ntlmssp_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)) {
DEBUG(2, ("Failed to start NTLMSSP process NTLMSSP negotiate: %s\n", nt_errstr(status)));
return False;
}
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 NTLMSSP auth request
*/
BOOL dcesrv_auth_auth3(struct dcesrv_call_state *call)
{
struct dcerpc_packet *pkt = &call->pkt;
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
if (!dce_conn->auth_state.auth_info ||
!dce_conn->auth_state.ntlmssp_state ||
pkt->u.auth.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);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
if (dce_conn->auth_state.auth_info->auth_type != DCERPC_AUTH_TYPE_NTLMSSP) {
return False;
}
if (dce_conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_INTEGRITY &&
dce_conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY) {
return False;
}
status = auth_ntlmssp_update(dce_conn->auth_state.ntlmssp_state,
call->mem_ctx,
dce_conn->auth_state.auth_info->credentials,
&dce_conn->auth_state.auth_info->credentials);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(4, ("User failed to authenticated with NTLMSSP: %s\n", nt_errstr(status)));
return False;
}
return True;
}
/*
check credentials on a request
*/
BOOL dcesrv_auth_request(struct dcesrv_call_state *call)
{
struct dcerpc_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;
if (!dce_conn->auth_state.auth_info ||
!dce_conn->auth_state.ntlmssp_state) {
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;
}
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;
/* pull the auth structure */
ndr = ndr_pull_init_blob(&auth_blob, call->mem_ctx);
if (!ndr) {
return False;
}
if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
/* check signature or unseal the packet */
switch (dce_conn->auth_state.auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
status = ntlmssp_unseal_packet(dce_conn->auth_state.ntlmssp_state->ntlmssp_state,
call->mem_ctx,
pkt->u.request.stub_and_verifier.data,
pkt->u.request.stub_and_verifier.length,
&auth.credentials);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = ntlmssp_check_packet(dce_conn->auth_state.ntlmssp_state->ntlmssp_state,
call->mem_ctx,
pkt->u.request.stub_and_verifier.data,
pkt->u.request.stub_and_verifier.length,
&auth.credentials);
break;
default:
status = NT_STATUS_INVALID_LEVEL;
break;
}
/* remove the indicated amount of paddiing */
if (pkt->u.request.stub_and_verifier.length < auth.auth_pad_length) {
return False;
}
pkt->u.request.stub_and_verifier.length -= auth.auth_pad_length;
return NT_STATUS_IS_OK(status);
}
/*
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)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
struct ndr_push *ndr;
/* non-signed packets are simple */
if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.ntlmssp_state) {
status = dcerpc_push_auth(blob, call->mem_ctx, pkt, NULL);
return NT_STATUS_IS_OK(status);
}
ndr = ndr_push_init_ctx(call->mem_ctx);
if (!ndr) {
return False;
}
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;
}
/* 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);
/* sign or seal the packet */
switch (dce_conn->auth_state.auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
status = ntlmssp_seal_packet(dce_conn->auth_state.ntlmssp_state->ntlmssp_state,
call->mem_ctx,
ndr->data + DCERPC_REQUEST_LENGTH,
ndr->offset - DCERPC_REQUEST_LENGTH,
&dce_conn->auth_state.auth_info->credentials);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = ntlmssp_sign_packet(dce_conn->auth_state.ntlmssp_state->ntlmssp_state,
call->mem_ctx,
ndr->data + DCERPC_REQUEST_LENGTH,
ndr->offset - DCERPC_REQUEST_LENGTH,
&dce_conn->auth_state.auth_info->credentials);
break;
default:
status = NT_STATUS_INVALID_LEVEL;
break;
}
if (!NT_STATUS_IS_OK(status)) {
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;
}
/* 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);
return True;
}