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https://github.com/samba-team/samba.git
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7fab11e2eb
With this option turned off we only allow DCERPC_AUTH_LEVEL_{NONE,INTEGRITY,PRIVACY}, this means the reject any request with AUTH_LEVEL_CONNECT with ACCESS_DENIED. We sadly need to keep this enabled by default for now. BUG: https://bugzilla.samba.org/show_bug.cgi?id=11616 Pair-Programmed-With: Günther Deschner <gd@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Günther Deschner <gd@samba.org>
1653 lines
44 KiB
C
1653 lines
44 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* RPC Pipe client / server routines
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* Almost completely rewritten by (C) Jeremy Allison 2005 - 2010
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* this module apparently provides an implementation of DCE/RPC over a
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* named pipe (IPC$ connection using SMBtrans). details of DCE/RPC
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* documentation are available (in on-line form) from the X-Open group.
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*
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* this module should provide a level of abstraction between SMB
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* and DCE/RPC, while minimising the amount of mallocs, unnecessary
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* data copies, and network traffic.
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*
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "srv_pipe_internal.h"
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#include "../librpc/gen_ndr/dcerpc.h"
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#include "../librpc/rpc/rpc_common.h"
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#include "dcesrv_auth_generic.h"
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#include "rpc_server.h"
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#include "rpc_dce.h"
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#include "smbd/smbd.h"
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#include "auth.h"
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#include "ntdomain.h"
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#include "rpc_server/srv_pipe.h"
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#include "rpc_server/rpc_contexts.h"
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#include "lib/param/param.h"
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#include "librpc/ndr/ndr_table.h"
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#include "auth/gensec/gensec.h"
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#include "librpc/ndr/ndr_dcerpc.h"
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#include "lib/tsocket/tsocket.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_RPC_SRV
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static NTSTATUS pipe_auth_verify_final(struct pipes_struct *p);
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/**
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* Dump everything from the start of the end up of the provided data
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* into a file, but only at debug level >= 50
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**/
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static void dump_pdu_region(const char *name, int v,
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DATA_BLOB *data, size_t start, size_t end)
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{
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int fd, i;
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char *fname = NULL;
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ssize_t sz;
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if (DEBUGLEVEL < 50) return;
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if (start > data->length || end > data->length || start > end) return;
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for (i = 1; i < 100; i++) {
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if (v != -1) {
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fname = talloc_asprintf(talloc_tos(),
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"/tmp/%s_%d.%d.prs",
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name, v, i);
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} else {
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fname = talloc_asprintf(talloc_tos(),
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"/tmp/%s_%d.prs",
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name, i);
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}
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if (!fname) {
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return;
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}
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fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
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if (fd != -1 || errno != EEXIST) break;
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}
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if (fd != -1) {
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sz = write(fd, data->data + start, end - start);
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i = close(fd);
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if ((sz != end - start) || (i != 0) ) {
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DEBUG(0, ("Error writing/closing %s: %ld!=%ld %d\n",
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fname, (unsigned long)sz,
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(unsigned long)end - start, i));
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} else {
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DEBUG(0,("created %s\n", fname));
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}
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}
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TALLOC_FREE(fname);
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}
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static DATA_BLOB generic_session_key(void)
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{
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return data_blob_const("SystemLibraryDTC", 16);
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}
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/*******************************************************************
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Generate the next PDU to be returned from the data.
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********************************************************************/
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static NTSTATUS create_next_packet(TALLOC_CTX *mem_ctx,
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struct pipe_auth_data *auth,
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uint32_t call_id,
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DATA_BLOB *rdata,
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size_t data_sent_length,
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DATA_BLOB *frag,
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size_t *pdu_size)
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{
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union dcerpc_payload u;
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uint8_t pfc_flags;
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size_t data_left;
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size_t data_to_send;
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size_t frag_len;
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size_t pad_len = 0;
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size_t auth_len = 0;
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NTSTATUS status;
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ZERO_STRUCT(u.response);
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/* Set up rpc packet pfc flags. */
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if (data_sent_length == 0) {
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pfc_flags = DCERPC_PFC_FLAG_FIRST;
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} else {
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pfc_flags = 0;
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}
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/* Work out how much we can fit in a single PDU. */
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data_left = rdata->length - data_sent_length;
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/* Ensure there really is data left to send. */
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if (!data_left) {
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DEBUG(0, ("No data left to send !\n"));
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return NT_STATUS_BUFFER_TOO_SMALL;
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}
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status = dcerpc_guess_sizes(auth,
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DCERPC_RESPONSE_LENGTH,
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data_left,
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RPC_MAX_PDU_FRAG_LEN,
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&data_to_send, &frag_len,
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&auth_len, &pad_len);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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/* Set up the alloc hint. This should be the data left to send. */
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u.response.alloc_hint = data_left;
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/* Work out if this PDU will be the last. */
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if (data_sent_length + data_to_send >= rdata->length) {
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pfc_flags |= DCERPC_PFC_FLAG_LAST;
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}
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/* Prepare data to be NDR encoded. */
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u.response.stub_and_verifier =
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data_blob_const(rdata->data + data_sent_length, data_to_send);
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/* Store the packet in the data stream. */
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status = dcerpc_push_ncacn_packet(mem_ctx, DCERPC_PKT_RESPONSE,
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pfc_flags, auth_len, call_id,
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&u, frag);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("Failed to marshall RPC Packet.\n"));
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return status;
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}
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if (auth_len) {
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/* Set the proper length on the pdu, including padding.
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* Only needed if an auth trailer will be appended. */
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dcerpc_set_frag_length(frag, frag->length
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+ pad_len
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+ DCERPC_AUTH_TRAILER_LENGTH
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+ auth_len);
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}
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if (auth_len) {
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status = dcerpc_add_auth_footer(auth, pad_len, frag);
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if (!NT_STATUS_IS_OK(status)) {
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data_blob_free(frag);
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return status;
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}
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}
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*pdu_size = data_to_send;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Generate the next PDU to be returned from the data in p->rdata.
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********************************************************************/
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bool create_next_pdu(struct pipes_struct *p)
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{
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size_t pdu_size = 0;
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NTSTATUS status;
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/*
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* If we're in the fault state, keep returning fault PDU's until
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* the pipe gets closed. JRA.
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*/
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if (p->fault_state) {
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setup_fault_pdu(p, NT_STATUS(p->fault_state));
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return true;
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}
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status = create_next_packet(p->mem_ctx, &p->auth,
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p->call_id, &p->out_data.rdata,
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p->out_data.data_sent_length,
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&p->out_data.frag, &pdu_size);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("Failed to create packet with error %s, "
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"(auth level %u / type %u)\n",
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nt_errstr(status),
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(unsigned int)p->auth.auth_level,
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(unsigned int)p->auth.auth_type));
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return false;
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}
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/* Setup the counts for this PDU. */
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p->out_data.data_sent_length += pdu_size;
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p->out_data.current_pdu_sent = 0;
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return true;
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}
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static bool pipe_init_outgoing_data(struct pipes_struct *p);
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/*******************************************************************
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Marshall a bind_nak pdu.
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*******************************************************************/
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static bool setup_bind_nak(struct pipes_struct *p, struct ncacn_packet *pkt)
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{
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NTSTATUS status;
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union dcerpc_payload u;
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/* Free any memory in the current return data buffer. */
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pipe_init_outgoing_data(p);
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/*
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* Initialize a bind_nak header.
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*/
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ZERO_STRUCT(u);
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u.bind_nak.reject_reason = 0;
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/*
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* Marshall directly into the outgoing PDU space. We
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* must do this as we need to set to the bind response
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* header and are never sending more than one PDU here.
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*/
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status = dcerpc_push_ncacn_packet(p->mem_ctx,
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DCERPC_PKT_BIND_NAK,
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DCERPC_PFC_FLAG_FIRST |
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DCERPC_PFC_FLAG_LAST,
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0,
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pkt->call_id,
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&u,
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&p->out_data.frag);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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p->out_data.data_sent_length = 0;
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p->out_data.current_pdu_sent = 0;
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TALLOC_FREE(p->auth.auth_ctx);
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p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE;
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p->auth.auth_type = DCERPC_AUTH_TYPE_NONE;
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p->pipe_bound = False;
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return True;
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}
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/*******************************************************************
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Marshall a fault pdu.
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*******************************************************************/
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bool setup_fault_pdu(struct pipes_struct *p, NTSTATUS fault_status)
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{
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NTSTATUS status;
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union dcerpc_payload u;
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/* Free any memory in the current return data buffer. */
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pipe_init_outgoing_data(p);
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/*
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* Initialize a fault header.
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*/
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ZERO_STRUCT(u);
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u.fault.status = NT_STATUS_V(fault_status);
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u.fault._pad = data_blob_talloc_zero(p->mem_ctx, 4);
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/*
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* Marshall directly into the outgoing PDU space. We
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* must do this as we need to set to the bind response
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* header and are never sending more than one PDU here.
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*/
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status = dcerpc_push_ncacn_packet(p->mem_ctx,
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DCERPC_PKT_FAULT,
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DCERPC_PFC_FLAG_FIRST |
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DCERPC_PFC_FLAG_LAST |
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DCERPC_PFC_FLAG_DID_NOT_EXECUTE,
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0,
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p->call_id,
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&u,
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&p->out_data.frag);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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p->out_data.data_sent_length = 0;
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p->out_data.current_pdu_sent = 0;
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return True;
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}
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/*******************************************************************
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Ensure a bind request has the correct abstract & transfer interface.
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Used to reject unknown binds from Win2k.
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*******************************************************************/
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static bool check_bind_req(struct pipes_struct *p,
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struct ndr_syntax_id* abstract,
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struct ndr_syntax_id* transfer,
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uint32_t context_id)
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{
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struct pipe_rpc_fns *context_fns;
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bool ok;
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const char *interface_name = NULL;
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DEBUG(3,("check_bind_req for %s\n",
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ndr_interface_name(&abstract->uuid,
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abstract->if_version)));
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/* we have to check all now since win2k introduced a new UUID on the lsaprpc pipe */
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if (rpc_srv_pipe_exists_by_id(abstract) &&
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ndr_syntax_id_equal(transfer, &ndr_transfer_syntax_ndr)) {
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DEBUG(3, ("check_bind_req: %s -> %s rpc service\n",
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rpc_srv_get_pipe_cli_name(abstract),
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rpc_srv_get_pipe_srv_name(abstract)));
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} else {
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return false;
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}
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ok = init_pipe_handles(p, abstract);
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if (!ok) {
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DEBUG(1, ("Failed to init pipe handles!\n"));
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return false;
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}
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context_fns = talloc_zero(p, struct pipe_rpc_fns);
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if (context_fns == NULL) {
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DEBUG(0,("check_bind_req: talloc() failed!\n"));
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return false;
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}
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interface_name = ndr_interface_name(&abstract->uuid,
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abstract->if_version);
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SMB_ASSERT(interface_name != NULL);
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context_fns->next = context_fns->prev = NULL;
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context_fns->n_cmds = rpc_srv_get_pipe_num_cmds(abstract);
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context_fns->cmds = rpc_srv_get_pipe_cmds(abstract);
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context_fns->context_id = context_id;
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context_fns->syntax = *abstract;
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context_fns->allow_connect = lp_allow_dcerpc_auth_level_connect();
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/*
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* every interface can be modified to allow "connect" auth_level by
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* using a parametric option like:
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* allow dcerpc auth level connect:<interface>
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* e.g.
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* allow dcerpc auth level connect:samr = yes
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*/
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context_fns->allow_connect = lp_parm_bool(-1,
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"allow dcerpc auth level connect",
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interface_name, context_fns->allow_connect);
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/* add to the list of open contexts */
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DLIST_ADD( p->contexts, context_fns );
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return True;
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}
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/**
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* Is a named pipe known?
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* @param[in] pipename Just the filename
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* @result Do we want to serve this?
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*/
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bool is_known_pipename(const char *pipename, struct ndr_syntax_id *syntax)
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{
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NTSTATUS status;
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if (lp_disable_spoolss() && strequal(pipename, "spoolss")) {
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DEBUG(10, ("refusing spoolss access\n"));
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return false;
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}
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if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
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return true;
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}
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status = smb_probe_module("rpc", pipename);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("is_known_pipename: %s unknown\n", pipename));
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return false;
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}
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DEBUG(10, ("is_known_pipename: %s loaded dynamically\n", pipename));
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/*
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* Scan the list again for the interface id
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*/
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if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
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return true;
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}
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DEBUG(10, ("is_known_pipename: pipe %s did not register itself!\n",
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pipename));
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return false;
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}
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/*******************************************************************
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Handle an NTLMSSP bind auth.
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*******************************************************************/
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static bool pipe_auth_generic_bind(struct pipes_struct *p,
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struct ncacn_packet *pkt,
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struct dcerpc_auth *auth_info,
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DATA_BLOB *response)
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{
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TALLOC_CTX *mem_ctx = pkt;
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struct gensec_security *gensec_security = NULL;
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NTSTATUS status;
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status = auth_generic_server_authtype_start(p,
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auth_info->auth_type,
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auth_info->auth_level,
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&auth_info->credentials,
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response,
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p->remote_address,
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&gensec_security);
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if (!NT_STATUS_IS_OK(status) &&
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!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED))
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{
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DEBUG(0, (__location__ ": auth_generic_server_authtype_start[%u/%u] failed: %s\n",
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auth_info->auth_type, auth_info->auth_level, nt_errstr(status)));
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return false;
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}
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|
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/* Make sure data is bound to the memctx, to be freed the caller */
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talloc_steal(mem_ctx, response->data);
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p->auth.auth_ctx = gensec_security;
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p->auth.auth_type = auth_info->auth_type;
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if (pkt->pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) {
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p->auth.client_hdr_signing = true;
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p->auth.hdr_signing = gensec_have_feature(gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER);
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}
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|
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if (p->auth.hdr_signing) {
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gensec_want_feature(gensec_security,
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GENSEC_FEATURE_SIGN_PKT_HEADER);
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}
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|
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if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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return true;
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}
|
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|
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status = pipe_auth_verify_final(p);
|
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if (!NT_STATUS_IS_OK(status)) {
|
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DEBUG(0, ("pipe_auth_verify_final failed: %s\n",
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nt_errstr(status)));
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return false;
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}
|
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|
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return true;
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}
|
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|
|
/*******************************************************************
|
|
Process an NTLMSSP authentication response.
|
|
If this function succeeds, the user has been authenticated
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and their domain, name and calling workstation stored in
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the pipe struct.
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|
*******************************************************************/
|
|
|
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static bool pipe_auth_generic_verify_final(TALLOC_CTX *mem_ctx,
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struct gensec_security *gensec_security,
|
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enum dcerpc_AuthLevel auth_level,
|
|
struct auth_session_info **session_info)
|
|
{
|
|
NTSTATUS status;
|
|
bool ret;
|
|
|
|
DEBUG(5, (__location__ ": checking user details\n"));
|
|
|
|
/* Finally - if the pipe negotiated integrity (sign) or privacy (seal)
|
|
ensure the underlying NTLMSSP flags are also set. If not we should
|
|
refuse the bind. */
|
|
|
|
status = auth_generic_server_check_flags(gensec_security,
|
|
(auth_level ==
|
|
DCERPC_AUTH_LEVEL_INTEGRITY),
|
|
(auth_level ==
|
|
DCERPC_AUTH_LEVEL_PRIVACY));
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, (__location__ ": Client failed to negotatie proper "
|
|
"security for rpc connection\n"));
|
|
return false;
|
|
}
|
|
|
|
TALLOC_FREE(*session_info);
|
|
|
|
status = auth_generic_server_get_user_info(gensec_security,
|
|
mem_ctx, session_info);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, (__location__ ": failed to obtain the server info "
|
|
"for authenticated user: %s\n", nt_errstr(status)));
|
|
return false;
|
|
}
|
|
|
|
if ((*session_info)->security_token == NULL) {
|
|
DEBUG(1, ("Auth module failed to provide nt_user_token\n"));
|
|
return false;
|
|
}
|
|
|
|
if ((*session_info)->unix_token == NULL) {
|
|
DEBUG(1, ("Auth module failed to provide unix_token\n"));
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* We're an authenticated bind over smb, so the session key needs to
|
|
* be set to "SystemLibraryDTC". Weird, but this is what Windows
|
|
* does. See the RPC-SAMBA3SESSIONKEY.
|
|
*/
|
|
|
|
ret = session_info_set_session_key((*session_info), generic_session_key());
|
|
if (!ret) {
|
|
DEBUG(0, ("Failed to set session key!\n"));
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static NTSTATUS pipe_auth_verify_final(struct pipes_struct *p)
|
|
{
|
|
struct gensec_security *gensec_security;
|
|
bool ok;
|
|
|
|
if (p->auth.auth_type == DCERPC_AUTH_TYPE_NONE) {
|
|
p->pipe_bound = true;
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
gensec_security = p->auth.auth_ctx;
|
|
|
|
ok = pipe_auth_generic_verify_final(p, gensec_security,
|
|
p->auth.auth_level,
|
|
&p->session_info);
|
|
if (!ok) {
|
|
return NT_STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
p->pipe_bound = true;
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Respond to a pipe bind request.
|
|
*******************************************************************/
|
|
|
|
static bool api_pipe_bind_req(struct pipes_struct *p,
|
|
struct ncacn_packet *pkt)
|
|
{
|
|
struct dcerpc_auth auth_info = {0};
|
|
uint16_t assoc_gid;
|
|
unsigned int auth_type = DCERPC_AUTH_TYPE_NONE;
|
|
NTSTATUS status;
|
|
struct ndr_syntax_id id;
|
|
uint8_t pfc_flags = 0;
|
|
union dcerpc_payload u;
|
|
struct dcerpc_ack_ctx bind_ack_ctx;
|
|
DATA_BLOB auth_resp = data_blob_null;
|
|
DATA_BLOB auth_blob = data_blob_null;
|
|
const struct ndr_interface_table *table;
|
|
|
|
/* No rebinds on a bound pipe - use alter context. */
|
|
if (p->pipe_bound) {
|
|
DEBUG(2,("Rejecting bind request on bound rpc connection\n"));
|
|
return setup_bind_nak(p, pkt);
|
|
}
|
|
|
|
if (pkt->u.bind.num_contexts == 0) {
|
|
DEBUG(0, ("api_pipe_bind_req: no rpc contexts around\n"));
|
|
goto err_exit;
|
|
}
|
|
|
|
/*
|
|
* Try and find the correct pipe name to ensure
|
|
* that this is a pipe name we support.
|
|
*/
|
|
id = pkt->u.bind.ctx_list[0].abstract_syntax;
|
|
|
|
table = ndr_table_by_uuid(&id.uuid);
|
|
if (table == NULL) {
|
|
DEBUG(0,("unknown interface\n"));
|
|
return false;
|
|
}
|
|
|
|
if (rpc_srv_pipe_exists_by_id(&id)) {
|
|
DEBUG(3, ("api_pipe_bind_req: %s -> %s rpc service\n",
|
|
rpc_srv_get_pipe_cli_name(&id),
|
|
rpc_srv_get_pipe_srv_name(&id)));
|
|
} else {
|
|
status = smb_probe_module(
|
|
"rpc", dcerpc_default_transport_endpoint(pkt,
|
|
NCACN_NP, table));
|
|
|
|
if (NT_STATUS_IS_ERR(status)) {
|
|
DEBUG(3,("api_pipe_bind_req: Unknown rpc service name "
|
|
"%s in bind request.\n",
|
|
ndr_interface_name(&id.uuid,
|
|
id.if_version)));
|
|
|
|
return setup_bind_nak(p, pkt);
|
|
}
|
|
|
|
if (rpc_srv_get_pipe_interface_by_cli_name(
|
|
dcerpc_default_transport_endpoint(pkt,
|
|
NCACN_NP, table),
|
|
&id)) {
|
|
DEBUG(3, ("api_pipe_bind_req: %s -> %s rpc service\n",
|
|
rpc_srv_get_pipe_cli_name(&id),
|
|
rpc_srv_get_pipe_srv_name(&id)));
|
|
} else {
|
|
DEBUG(0, ("module %s doesn't provide functions for "
|
|
"pipe %s!\n",
|
|
ndr_interface_name(&id.uuid,
|
|
id.if_version),
|
|
ndr_interface_name(&id.uuid,
|
|
id.if_version)));
|
|
return setup_bind_nak(p, pkt);
|
|
}
|
|
}
|
|
|
|
DEBUG(5,("api_pipe_bind_req: make response. %d\n", __LINE__));
|
|
|
|
if (pkt->u.bind.assoc_group_id != 0) {
|
|
assoc_gid = pkt->u.bind.assoc_group_id;
|
|
} else {
|
|
assoc_gid = 0x53f0;
|
|
}
|
|
|
|
/*
|
|
* Create the bind response struct.
|
|
*/
|
|
|
|
/* If the requested abstract synt uuid doesn't match our client pipe,
|
|
reject the bind_ack & set the transfer interface synt to all 0's,
|
|
ver 0 (observed when NT5 attempts to bind to abstract interfaces
|
|
unknown to NT4)
|
|
Needed when adding entries to a DACL from NT5 - SK */
|
|
|
|
if (check_bind_req(p,
|
|
&pkt->u.bind.ctx_list[0].abstract_syntax,
|
|
&pkt->u.bind.ctx_list[0].transfer_syntaxes[0],
|
|
pkt->u.bind.ctx_list[0].context_id)) {
|
|
|
|
bind_ack_ctx.result = 0;
|
|
bind_ack_ctx.reason.value = 0;
|
|
bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0];
|
|
} else {
|
|
p->pipe_bound = False;
|
|
/* Rejection reason: abstract syntax not supported */
|
|
bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT;
|
|
bind_ack_ctx.reason.value = DCERPC_BIND_REASON_ASYNTAX;
|
|
bind_ack_ctx.syntax = ndr_syntax_id_null;
|
|
}
|
|
|
|
/*
|
|
* Check if this is an authenticated bind request.
|
|
*/
|
|
if (pkt->auth_length) {
|
|
/* Quick length check. Won't catch a bad auth footer,
|
|
* prevents overrun. */
|
|
|
|
if (pkt->frag_length < RPC_HEADER_LEN +
|
|
DCERPC_AUTH_TRAILER_LENGTH +
|
|
pkt->auth_length) {
|
|
DEBUG(0,("api_pipe_bind_req: auth_len (%u) "
|
|
"too long for fragment %u.\n",
|
|
(unsigned int)pkt->auth_length,
|
|
(unsigned int)pkt->frag_length));
|
|
goto err_exit;
|
|
}
|
|
|
|
/*
|
|
* Decode the authentication verifier.
|
|
*/
|
|
status = dcerpc_pull_dcerpc_auth(pkt,
|
|
&pkt->u.bind.auth_info,
|
|
&auth_info, p->endian);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n"));
|
|
goto err_exit;
|
|
}
|
|
|
|
auth_type = auth_info.auth_type;
|
|
|
|
/* Work out if we have to sign or seal etc. */
|
|
switch (auth_info.auth_level) {
|
|
case DCERPC_AUTH_LEVEL_INTEGRITY:
|
|
p->auth.auth_level = DCERPC_AUTH_LEVEL_INTEGRITY;
|
|
break;
|
|
case DCERPC_AUTH_LEVEL_PRIVACY:
|
|
p->auth.auth_level = DCERPC_AUTH_LEVEL_PRIVACY;
|
|
break;
|
|
case DCERPC_AUTH_LEVEL_CONNECT:
|
|
p->auth.auth_level = DCERPC_AUTH_LEVEL_CONNECT;
|
|
break;
|
|
default:
|
|
DEBUG(0, ("Unexpected auth level (%u).\n",
|
|
(unsigned int)auth_info.auth_level ));
|
|
goto err_exit;
|
|
}
|
|
|
|
switch (auth_type) {
|
|
case DCERPC_AUTH_TYPE_NONE:
|
|
break;
|
|
|
|
default:
|
|
if (!pipe_auth_generic_bind(p, pkt,
|
|
&auth_info, &auth_resp)) {
|
|
goto err_exit;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (auth_type == DCERPC_AUTH_TYPE_NONE) {
|
|
/* Unauthenticated bind request. */
|
|
/* We're finished - no more packets. */
|
|
p->auth.auth_type = DCERPC_AUTH_TYPE_NONE;
|
|
/* We must set the pipe auth_level here also. */
|
|
p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE;
|
|
p->pipe_bound = True;
|
|
/* The session key was initialized from the SMB
|
|
* session in make_internal_rpc_pipe_p */
|
|
}
|
|
|
|
ZERO_STRUCT(u.bind_ack);
|
|
u.bind_ack.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
|
|
u.bind_ack.max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
|
|
u.bind_ack.assoc_group_id = assoc_gid;
|
|
|
|
/* name has to be \PIPE\xxxxx */
|
|
u.bind_ack.secondary_address =
|
|
talloc_asprintf(pkt, "\\PIPE\\%s",
|
|
rpc_srv_get_pipe_srv_name(&id));
|
|
if (!u.bind_ack.secondary_address) {
|
|
DEBUG(0, ("Out of memory!\n"));
|
|
goto err_exit;
|
|
}
|
|
u.bind_ack.secondary_address_size =
|
|
strlen(u.bind_ack.secondary_address) + 1;
|
|
|
|
u.bind_ack.num_results = 1;
|
|
u.bind_ack.ctx_list = &bind_ack_ctx;
|
|
|
|
/* NOTE: We leave the auth_info empty so we can calculate the padding
|
|
* later and then append the auth_info --simo */
|
|
|
|
/*
|
|
* Marshall directly into the outgoing PDU space. We
|
|
* must do this as we need to set to the bind response
|
|
* header and are never sending more than one PDU here.
|
|
*/
|
|
|
|
pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST;
|
|
|
|
if (p->auth.hdr_signing) {
|
|
pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
|
|
}
|
|
|
|
status = dcerpc_push_ncacn_packet(p->mem_ctx,
|
|
DCERPC_PKT_BIND_ACK,
|
|
pfc_flags,
|
|
auth_resp.length,
|
|
pkt->call_id,
|
|
&u,
|
|
&p->out_data.frag);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n",
|
|
nt_errstr(status)));
|
|
}
|
|
|
|
if (auth_resp.length) {
|
|
|
|
status = dcerpc_push_dcerpc_auth(pkt,
|
|
auth_type,
|
|
auth_info.auth_level,
|
|
0,
|
|
1, /* auth_context_id */
|
|
&auth_resp,
|
|
&auth_blob);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Marshalling of dcerpc_auth failed.\n"));
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
/* Now that we have the auth len store it into the right place in
|
|
* the dcerpc header */
|
|
dcerpc_set_frag_length(&p->out_data.frag,
|
|
p->out_data.frag.length + auth_blob.length);
|
|
|
|
if (auth_blob.length) {
|
|
|
|
if (!data_blob_append(p->mem_ctx, &p->out_data.frag,
|
|
auth_blob.data, auth_blob.length)) {
|
|
DEBUG(0, ("Append of auth info failed.\n"));
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup the lengths for the initial reply.
|
|
*/
|
|
|
|
p->out_data.data_sent_length = 0;
|
|
p->out_data.current_pdu_sent = 0;
|
|
|
|
TALLOC_FREE(auth_blob.data);
|
|
return True;
|
|
|
|
err_exit:
|
|
|
|
data_blob_free(&p->out_data.frag);
|
|
TALLOC_FREE(auth_blob.data);
|
|
return setup_bind_nak(p, pkt);
|
|
}
|
|
|
|
/*******************************************************************
|
|
This is the "stage3" response after a bind request and reply.
|
|
*******************************************************************/
|
|
|
|
bool api_pipe_bind_auth3(struct pipes_struct *p, struct ncacn_packet *pkt)
|
|
{
|
|
struct dcerpc_auth auth_info;
|
|
DATA_BLOB response = data_blob_null;
|
|
struct gensec_security *gensec_security;
|
|
NTSTATUS status;
|
|
|
|
DEBUG(5, ("api_pipe_bind_auth3: decode request. %d\n", __LINE__));
|
|
|
|
if (pkt->auth_length == 0) {
|
|
DEBUG(1, ("No auth field sent for bind request!\n"));
|
|
goto err;
|
|
}
|
|
|
|
/* Ensure there's enough data for an authenticated request. */
|
|
if (pkt->frag_length < RPC_HEADER_LEN
|
|
+ DCERPC_AUTH_TRAILER_LENGTH
|
|
+ pkt->auth_length) {
|
|
DEBUG(1,("api_pipe_ntlmssp_auth_process: auth_len "
|
|
"%u is too large.\n",
|
|
(unsigned int)pkt->auth_length));
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Decode the authentication verifier response.
|
|
*/
|
|
|
|
status = dcerpc_pull_dcerpc_auth(pkt,
|
|
&pkt->u.auth3.auth_info,
|
|
&auth_info, p->endian);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("Failed to unmarshall dcerpc_auth.\n"));
|
|
goto err;
|
|
}
|
|
|
|
/* We must NEVER look at auth_info->auth_pad_len here,
|
|
* as old Samba client code gets it wrong and sends it
|
|
* as zero. JRA.
|
|
*/
|
|
|
|
if (auth_info.auth_type != p->auth.auth_type) {
|
|
DEBUG(1, ("Auth type mismatch! Client sent %d, "
|
|
"but auth was started as type %d!\n",
|
|
auth_info.auth_type, p->auth.auth_type));
|
|
goto err;
|
|
}
|
|
|
|
gensec_security = p->auth.auth_ctx;
|
|
|
|
status = auth_generic_server_step(gensec_security,
|
|
pkt, &auth_info.credentials,
|
|
&response);
|
|
|
|
if (NT_STATUS_EQUAL(status,
|
|
NT_STATUS_MORE_PROCESSING_REQUIRED) ||
|
|
response.length) {
|
|
DEBUG(1, (__location__ ": This was supposed to be the final "
|
|
"leg, but crypto machinery claims a response is "
|
|
"needed, aborting auth!\n"));
|
|
data_blob_free(&response);
|
|
goto err;
|
|
}
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(2, ("Auth failed (%s)\n", nt_errstr(status)));
|
|
goto err;
|
|
}
|
|
|
|
/* Now verify auth was indeed successful and extract server info */
|
|
status = pipe_auth_verify_final(p);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(2, ("Auth Verify failed (%s)\n", nt_errstr(status)));
|
|
goto err;
|
|
}
|
|
|
|
return true;
|
|
|
|
err:
|
|
|
|
TALLOC_FREE(p->auth.auth_ctx);
|
|
return false;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Deal with an alter context call. Can be third part of 3 leg auth request for
|
|
SPNEGO calls.
|
|
****************************************************************************/
|
|
|
|
static bool api_pipe_alter_context(struct pipes_struct *p,
|
|
struct ncacn_packet *pkt)
|
|
{
|
|
struct dcerpc_auth auth_info = {0};
|
|
uint16_t assoc_gid;
|
|
NTSTATUS status;
|
|
union dcerpc_payload u;
|
|
struct dcerpc_ack_ctx bind_ack_ctx;
|
|
DATA_BLOB auth_resp = data_blob_null;
|
|
DATA_BLOB auth_blob = data_blob_null;
|
|
struct gensec_security *gensec_security;
|
|
|
|
DEBUG(5,("api_pipe_alter_context: make response. %d\n", __LINE__));
|
|
|
|
if (pkt->u.bind.assoc_group_id != 0) {
|
|
assoc_gid = pkt->u.bind.assoc_group_id;
|
|
} else {
|
|
assoc_gid = 0x53f0;
|
|
}
|
|
|
|
/*
|
|
* Create the bind response struct.
|
|
*/
|
|
|
|
/* If the requested abstract synt uuid doesn't match our client pipe,
|
|
reject the bind_ack & set the transfer interface synt to all 0's,
|
|
ver 0 (observed when NT5 attempts to bind to abstract interfaces
|
|
unknown to NT4)
|
|
Needed when adding entries to a DACL from NT5 - SK */
|
|
|
|
if (check_bind_req(p,
|
|
&pkt->u.bind.ctx_list[0].abstract_syntax,
|
|
&pkt->u.bind.ctx_list[0].transfer_syntaxes[0],
|
|
pkt->u.bind.ctx_list[0].context_id)) {
|
|
|
|
bind_ack_ctx.result = 0;
|
|
bind_ack_ctx.reason.value = 0;
|
|
bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0];
|
|
} else {
|
|
p->pipe_bound = False;
|
|
/* Rejection reason: abstract syntax not supported */
|
|
bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT;
|
|
bind_ack_ctx.reason.value = DCERPC_BIND_REASON_ASYNTAX;
|
|
bind_ack_ctx.syntax = ndr_syntax_id_null;
|
|
}
|
|
|
|
/*
|
|
* Check if this is an authenticated alter context request.
|
|
*/
|
|
if (pkt->auth_length) {
|
|
/* Quick length check. Won't catch a bad auth footer,
|
|
* prevents overrun. */
|
|
|
|
if (pkt->frag_length < RPC_HEADER_LEN +
|
|
DCERPC_AUTH_TRAILER_LENGTH +
|
|
pkt->auth_length) {
|
|
DEBUG(0,("api_pipe_alter_context: auth_len (%u) "
|
|
"too long for fragment %u.\n",
|
|
(unsigned int)pkt->auth_length,
|
|
(unsigned int)pkt->frag_length ));
|
|
goto err_exit;
|
|
}
|
|
|
|
status = dcerpc_pull_dcerpc_auth(pkt,
|
|
&pkt->u.bind.auth_info,
|
|
&auth_info, p->endian);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n"));
|
|
goto err_exit;
|
|
}
|
|
|
|
/* We can only finish if the pipe is unbound for now */
|
|
if (p->pipe_bound) {
|
|
DEBUG(0, (__location__ ": Pipe already bound, "
|
|
"Altering Context not yet supported!\n"));
|
|
goto err_exit;
|
|
}
|
|
|
|
if (auth_info.auth_type != p->auth.auth_type) {
|
|
DEBUG(0, ("Auth type mismatch! Client sent %d, "
|
|
"but auth was started as type %d!\n",
|
|
auth_info.auth_type, p->auth.auth_type));
|
|
goto err_exit;
|
|
}
|
|
|
|
gensec_security = p->auth.auth_ctx;
|
|
status = auth_generic_server_step(gensec_security,
|
|
pkt,
|
|
&auth_info.credentials,
|
|
&auth_resp);
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
/* third leg of auth, verify auth info */
|
|
status = pipe_auth_verify_final(p);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Auth Verify failed (%s)\n",
|
|
nt_errstr(status)));
|
|
goto err_exit;
|
|
}
|
|
} else if (NT_STATUS_EQUAL(status,
|
|
NT_STATUS_MORE_PROCESSING_REQUIRED)) {
|
|
DEBUG(10, ("More auth legs required.\n"));
|
|
} else {
|
|
DEBUG(0, ("Auth step returned an error (%s)\n",
|
|
nt_errstr(status)));
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
ZERO_STRUCT(u.alter_resp);
|
|
u.alter_resp.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
|
|
u.alter_resp.max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
|
|
u.alter_resp.assoc_group_id = assoc_gid;
|
|
|
|
/* secondary address CAN be NULL
|
|
* as the specs say it's ignored.
|
|
* It MUST be NULL to have the spoolss working.
|
|
*/
|
|
u.alter_resp.secondary_address = "";
|
|
u.alter_resp.secondary_address_size = 1;
|
|
|
|
u.alter_resp.num_results = 1;
|
|
u.alter_resp.ctx_list = &bind_ack_ctx;
|
|
|
|
/* NOTE: We leave the auth_info empty so we can calculate the padding
|
|
* later and then append the auth_info --simo */
|
|
|
|
/*
|
|
* Marshall directly into the outgoing PDU space. We
|
|
* must do this as we need to set to the bind response
|
|
* header and are never sending more than one PDU here.
|
|
*/
|
|
|
|
status = dcerpc_push_ncacn_packet(p->mem_ctx,
|
|
DCERPC_PKT_ALTER_RESP,
|
|
DCERPC_PFC_FLAG_FIRST |
|
|
DCERPC_PFC_FLAG_LAST,
|
|
auth_resp.length,
|
|
pkt->call_id,
|
|
&u,
|
|
&p->out_data.frag);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n",
|
|
nt_errstr(status)));
|
|
}
|
|
|
|
if (auth_resp.length) {
|
|
status = dcerpc_push_dcerpc_auth(pkt,
|
|
auth_info.auth_type,
|
|
auth_info.auth_level,
|
|
0, /* pad_len */
|
|
1, /* auth_context_id */
|
|
&auth_resp,
|
|
&auth_blob);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Marshalling of dcerpc_auth failed.\n"));
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
/* Now that we have the auth len store it into the right place in
|
|
* the dcerpc header */
|
|
dcerpc_set_frag_length(&p->out_data.frag,
|
|
p->out_data.frag.length +
|
|
auth_blob.length);
|
|
|
|
if (auth_resp.length) {
|
|
if (!data_blob_append(p->mem_ctx, &p->out_data.frag,
|
|
auth_blob.data, auth_blob.length)) {
|
|
DEBUG(0, ("Append of auth info failed.\n"));
|
|
goto err_exit;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup the lengths for the initial reply.
|
|
*/
|
|
|
|
p->out_data.data_sent_length = 0;
|
|
p->out_data.current_pdu_sent = 0;
|
|
|
|
TALLOC_FREE(auth_blob.data);
|
|
return True;
|
|
|
|
err_exit:
|
|
|
|
data_blob_free(&p->out_data.frag);
|
|
TALLOC_FREE(auth_blob.data);
|
|
return setup_bind_nak(p, pkt);
|
|
}
|
|
|
|
static bool api_rpcTNP(struct pipes_struct *p, struct ncacn_packet *pkt,
|
|
const struct api_struct *api_rpc_cmds, int n_cmds,
|
|
const struct ndr_syntax_id *syntax);
|
|
|
|
static bool srv_pipe_check_verification_trailer(struct pipes_struct *p,
|
|
struct ncacn_packet *pkt,
|
|
struct pipe_rpc_fns *pipe_fns)
|
|
{
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
struct dcerpc_sec_verification_trailer *vt = NULL;
|
|
const uint32_t bitmask1 =
|
|
p->auth.client_hdr_signing ? DCERPC_SEC_VT_CLIENT_SUPPORTS_HEADER_SIGNING : 0;
|
|
const struct dcerpc_sec_vt_pcontext pcontext = {
|
|
.abstract_syntax = pipe_fns->syntax,
|
|
.transfer_syntax = ndr_transfer_syntax_ndr,
|
|
};
|
|
const struct dcerpc_sec_vt_header2 header2 =
|
|
dcerpc_sec_vt_header2_from_ncacn_packet(pkt);
|
|
struct ndr_pull *ndr;
|
|
enum ndr_err_code ndr_err;
|
|
bool ret = false;
|
|
|
|
ndr = ndr_pull_init_blob(&p->in_data.data, frame);
|
|
if (ndr == NULL) {
|
|
goto done;
|
|
}
|
|
|
|
ndr_err = ndr_pop_dcerpc_sec_verification_trailer(ndr, frame, &vt);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
goto done;
|
|
}
|
|
|
|
ret = dcerpc_sec_verification_trailer_check(vt, &bitmask1,
|
|
&pcontext, &header2);
|
|
done:
|
|
TALLOC_FREE(frame);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Find the correct RPC function to call for this request.
|
|
If the pipe is authenticated then become the correct UNIX user
|
|
before doing the call.
|
|
****************************************************************************/
|
|
|
|
static bool api_pipe_request(struct pipes_struct *p,
|
|
struct ncacn_packet *pkt)
|
|
{
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
bool ret = False;
|
|
struct pipe_rpc_fns *pipe_fns;
|
|
const char *interface_name = NULL;
|
|
|
|
if (!p->pipe_bound) {
|
|
DEBUG(1, ("Pipe not bound!\n"));
|
|
data_blob_free(&p->out_data.rdata);
|
|
TALLOC_FREE(frame);
|
|
return false;
|
|
}
|
|
|
|
/* get the set of RPC functions for this context */
|
|
pipe_fns = find_pipe_fns_by_context(p->contexts,
|
|
pkt->u.request.context_id);
|
|
if (pipe_fns == NULL) {
|
|
DEBUG(0, ("No rpc function table associated with context "
|
|
"[%d]\n",
|
|
pkt->u.request.context_id));
|
|
data_blob_free(&p->out_data.rdata);
|
|
TALLOC_FREE(frame);
|
|
return false;
|
|
}
|
|
|
|
interface_name = ndr_interface_name(&pipe_fns->syntax.uuid,
|
|
pipe_fns->syntax.if_version);
|
|
SMB_ASSERT(interface_name != NULL);
|
|
|
|
switch (p->auth.auth_level) {
|
|
case DCERPC_AUTH_LEVEL_NONE:
|
|
case DCERPC_AUTH_LEVEL_INTEGRITY:
|
|
case DCERPC_AUTH_LEVEL_PRIVACY:
|
|
break;
|
|
default:
|
|
if (!pipe_fns->allow_connect) {
|
|
char *addr;
|
|
|
|
addr = tsocket_address_string(p->remote_address, frame);
|
|
|
|
DEBUG(1, ("%s: restrict auth_level_connect access "
|
|
"to [%s] with auth[type=0x%x,level=0x%x] "
|
|
"on [%s] from [%s]\n",
|
|
__func__, interface_name,
|
|
p->auth.auth_type,
|
|
p->auth.auth_level,
|
|
derpc_transport_string_by_transport(p->transport),
|
|
addr));
|
|
|
|
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_ACCESS_DENIED));
|
|
TALLOC_FREE(frame);
|
|
return true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!srv_pipe_check_verification_trailer(p, pkt, pipe_fns)) {
|
|
DEBUG(1, ("srv_pipe_check_verification_trailer: failed\n"));
|
|
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_ACCESS_DENIED));
|
|
data_blob_free(&p->out_data.rdata);
|
|
TALLOC_FREE(frame);
|
|
return true;
|
|
}
|
|
|
|
if (!become_authenticated_pipe_user(p->session_info)) {
|
|
DEBUG(1, ("Failed to become pipe user!\n"));
|
|
data_blob_free(&p->out_data.rdata);
|
|
TALLOC_FREE(frame);
|
|
return false;
|
|
}
|
|
|
|
DEBUG(5, ("Requested %s rpc service\n", interface_name));
|
|
|
|
ret = api_rpcTNP(p, pkt, pipe_fns->cmds, pipe_fns->n_cmds,
|
|
&pipe_fns->syntax);
|
|
unbecome_authenticated_pipe_user();
|
|
|
|
TALLOC_FREE(frame);
|
|
return ret;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Calls the underlying RPC function for a named pipe.
|
|
********************************************************************/
|
|
|
|
static bool api_rpcTNP(struct pipes_struct *p, struct ncacn_packet *pkt,
|
|
const struct api_struct *api_rpc_cmds, int n_cmds,
|
|
const struct ndr_syntax_id *syntax)
|
|
{
|
|
int fn_num;
|
|
uint32_t offset1;
|
|
const struct ndr_interface_table *table;
|
|
|
|
/* interpret the command */
|
|
DEBUG(4,("api_rpcTNP: %s op 0x%x - ",
|
|
ndr_interface_name(&syntax->uuid, syntax->if_version),
|
|
pkt->u.request.opnum));
|
|
|
|
table = ndr_table_by_uuid(&syntax->uuid);
|
|
if (table == NULL) {
|
|
DEBUG(0,("unknown interface\n"));
|
|
return false;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 50) {
|
|
fstring name;
|
|
slprintf(name, sizeof(name)-1, "in_%s",
|
|
dcerpc_default_transport_endpoint(pkt, NCACN_NP, table));
|
|
dump_pdu_region(name, pkt->u.request.opnum,
|
|
&p->in_data.data, 0,
|
|
p->in_data.data.length);
|
|
}
|
|
|
|
for (fn_num = 0; fn_num < n_cmds; fn_num++) {
|
|
if (api_rpc_cmds[fn_num].opnum == pkt->u.request.opnum &&
|
|
api_rpc_cmds[fn_num].fn != NULL) {
|
|
DEBUG(3, ("api_rpcTNP: rpc command: %s\n",
|
|
api_rpc_cmds[fn_num].name));
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fn_num == n_cmds) {
|
|
/*
|
|
* For an unknown RPC just return a fault PDU but
|
|
* return True to allow RPC's on the pipe to continue
|
|
* and not put the pipe into fault state. JRA.
|
|
*/
|
|
DEBUG(4, ("unknown\n"));
|
|
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
|
|
return True;
|
|
}
|
|
|
|
offset1 = p->out_data.rdata.length;
|
|
|
|
DEBUG(6, ("api_rpc_cmds[%d].fn == %p\n",
|
|
fn_num, api_rpc_cmds[fn_num].fn));
|
|
/* do the actual command */
|
|
if(!api_rpc_cmds[fn_num].fn(p)) {
|
|
DEBUG(0,("api_rpcTNP: %s: %s failed.\n",
|
|
ndr_interface_name(&syntax->uuid, syntax->if_version),
|
|
api_rpc_cmds[fn_num].name));
|
|
data_blob_free(&p->out_data.rdata);
|
|
return False;
|
|
}
|
|
|
|
if (p->fault_state) {
|
|
DEBUG(4,("api_rpcTNP: fault(%d) return.\n", p->fault_state));
|
|
setup_fault_pdu(p, NT_STATUS(p->fault_state));
|
|
p->fault_state = 0;
|
|
return true;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 50) {
|
|
fstring name;
|
|
slprintf(name, sizeof(name)-1, "out_%s",
|
|
dcerpc_default_transport_endpoint(pkt, NCACN_NP, table));
|
|
dump_pdu_region(name, pkt->u.request.opnum,
|
|
&p->out_data.rdata, offset1,
|
|
p->out_data.rdata.length);
|
|
}
|
|
|
|
DEBUG(5,("api_rpcTNP: called %s successfully\n",
|
|
ndr_interface_name(&syntax->uuid, syntax->if_version)));
|
|
|
|
/* Check for buffer underflow in rpc parsing */
|
|
if ((DEBUGLEVEL >= 10) &&
|
|
(pkt->frag_length < p->in_data.data.length)) {
|
|
DEBUG(10, ("api_rpcTNP: rpc input buffer underflow (parse error?)\n"));
|
|
dump_data(10, p->in_data.data.data + pkt->frag_length,
|
|
p->in_data.data.length - pkt->frag_length);
|
|
}
|
|
|
|
return True;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Initialise an outgoing packet.
|
|
****************************************************************************/
|
|
|
|
static bool pipe_init_outgoing_data(struct pipes_struct *p)
|
|
{
|
|
output_data *o_data = &p->out_data;
|
|
|
|
/* Reset the offset counters. */
|
|
o_data->data_sent_length = 0;
|
|
o_data->current_pdu_sent = 0;
|
|
|
|
data_blob_free(&o_data->frag);
|
|
|
|
/* Free any memory in the current return data buffer. */
|
|
data_blob_free(&o_data->rdata);
|
|
|
|
return True;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Sets the fault state on incoming packets.
|
|
****************************************************************************/
|
|
|
|
void set_incoming_fault(struct pipes_struct *p)
|
|
{
|
|
data_blob_free(&p->in_data.data);
|
|
p->in_data.pdu_needed_len = 0;
|
|
p->in_data.pdu.length = 0;
|
|
p->fault_state = DCERPC_FAULT_CANT_PERFORM;
|
|
|
|
DEBUG(10, ("Setting fault state\n"));
|
|
}
|
|
|
|
static NTSTATUS dcesrv_auth_request(struct pipe_auth_data *auth,
|
|
struct ncacn_packet *pkt,
|
|
DATA_BLOB *raw_pkt)
|
|
{
|
|
NTSTATUS status;
|
|
size_t hdr_size = DCERPC_REQUEST_LENGTH;
|
|
size_t pad_len;
|
|
|
|
DEBUG(10, ("Checking request auth.\n"));
|
|
|
|
if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
|
|
hdr_size += 16;
|
|
}
|
|
|
|
/* in case of sealing this function will unseal the data in place */
|
|
status = dcerpc_check_auth(auth, pkt,
|
|
&pkt->u.request.stub_and_verifier,
|
|
hdr_size, raw_pkt,
|
|
&pad_len);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
|
|
/* remove padding and auth trailer,
|
|
* this way the caller will get just the data */
|
|
if (pkt->auth_length) {
|
|
size_t trail_len = pad_len
|
|
+ DCERPC_AUTH_TRAILER_LENGTH
|
|
+ pkt->auth_length;
|
|
if (pkt->u.request.stub_and_verifier.length < trail_len) {
|
|
return NT_STATUS_INFO_LENGTH_MISMATCH;
|
|
}
|
|
pkt->u.request.stub_and_verifier.length -= trail_len;
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Processes a request pdu. This will do auth processing if needed, and
|
|
appends the data into the complete stream if the LAST flag is not set.
|
|
****************************************************************************/
|
|
|
|
static bool process_request_pdu(struct pipes_struct *p, struct ncacn_packet *pkt)
|
|
{
|
|
NTSTATUS status;
|
|
DATA_BLOB data;
|
|
struct dcerpc_sec_vt_header2 hdr2;
|
|
|
|
if (!p->pipe_bound) {
|
|
DEBUG(0,("process_request_pdu: rpc request with no bind.\n"));
|
|
set_incoming_fault(p);
|
|
return False;
|
|
}
|
|
|
|
hdr2 = dcerpc_sec_vt_header2_from_ncacn_packet(pkt);
|
|
if (pkt->pfc_flags & DCERPC_PFC_FLAG_FIRST) {
|
|
p->header2 = hdr2;
|
|
} else {
|
|
if (!dcerpc_sec_vt_header2_equal(&hdr2, &p->header2)) {
|
|
set_incoming_fault(p);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* Store the opnum */
|
|
p->opnum = pkt->u.request.opnum;
|
|
|
|
status = dcesrv_auth_request(&p->auth, pkt, &p->in_data.pdu);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Failed to check packet auth. (%s)\n",
|
|
nt_errstr(status)));
|
|
set_incoming_fault(p);
|
|
return false;
|
|
}
|
|
|
|
data = pkt->u.request.stub_and_verifier;
|
|
|
|
/*
|
|
* Check the data length doesn't go over the 15Mb limit.
|
|
* increased after observing a bug in the Windows NT 4.0 SP6a
|
|
* spoolsv.exe when the response to a GETPRINTERDRIVER2 RPC
|
|
* will not fit in the initial buffer of size 0x1068 --jerry 22/01/2002
|
|
*/
|
|
|
|
if (p->in_data.data.length + data.length > MAX_RPC_DATA_SIZE) {
|
|
DEBUG(0, ("process_request_pdu: "
|
|
"rpc data buffer too large (%u) + (%u)\n",
|
|
(unsigned int)p->in_data.data.length,
|
|
(unsigned int)data.length));
|
|
set_incoming_fault(p);
|
|
return False;
|
|
}
|
|
|
|
/*
|
|
* Append the data portion into the buffer and return.
|
|
*/
|
|
|
|
if (data.length) {
|
|
if (!data_blob_append(p->mem_ctx, &p->in_data.data,
|
|
data.data, data.length)) {
|
|
DEBUG(0, ("Unable to append data size %u "
|
|
"to parse buffer of size %u.\n",
|
|
(unsigned int)data.length,
|
|
(unsigned int)p->in_data.data.length));
|
|
set_incoming_fault(p);
|
|
return False;
|
|
}
|
|
}
|
|
|
|
if (!(pkt->pfc_flags & DCERPC_PFC_FLAG_LAST)) {
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Ok - we finally have a complete RPC stream.
|
|
* Call the rpc command to process it.
|
|
*/
|
|
|
|
return api_pipe_request(p, pkt);
|
|
}
|
|
|
|
void process_complete_pdu(struct pipes_struct *p, struct ncacn_packet *pkt)
|
|
{
|
|
bool reply = false;
|
|
|
|
/* Store the call_id */
|
|
p->call_id = pkt->call_id;
|
|
|
|
DEBUG(10, ("Processing packet type %u\n", (unsigned int)pkt->ptype));
|
|
|
|
if (!pipe_init_outgoing_data(p)) {
|
|
goto done;
|
|
}
|
|
|
|
switch (pkt->ptype) {
|
|
case DCERPC_PKT_REQUEST:
|
|
reply = process_request_pdu(p, pkt);
|
|
break;
|
|
|
|
case DCERPC_PKT_PING: /* CL request - ignore... */
|
|
DEBUG(0, ("Error - Connectionless packet type %u received\n",
|
|
(unsigned int)pkt->ptype));
|
|
break;
|
|
|
|
case DCERPC_PKT_RESPONSE: /* No responses here. */
|
|
DEBUG(0, ("Error - DCERPC_PKT_RESPONSE received from client"));
|
|
break;
|
|
|
|
case DCERPC_PKT_FAULT:
|
|
case DCERPC_PKT_WORKING:
|
|
/* CL request - reply to a ping when a call in process. */
|
|
case DCERPC_PKT_NOCALL:
|
|
/* CL - server reply to a ping call. */
|
|
case DCERPC_PKT_REJECT:
|
|
case DCERPC_PKT_ACK:
|
|
case DCERPC_PKT_CL_CANCEL:
|
|
case DCERPC_PKT_FACK:
|
|
case DCERPC_PKT_CANCEL_ACK:
|
|
DEBUG(0, ("Error - Connectionless packet type %u received\n",
|
|
(unsigned int)pkt->ptype));
|
|
break;
|
|
|
|
case DCERPC_PKT_BIND:
|
|
/*
|
|
* We assume that a pipe bind is only in one pdu.
|
|
*/
|
|
reply = api_pipe_bind_req(p, pkt);
|
|
break;
|
|
|
|
case DCERPC_PKT_BIND_ACK:
|
|
case DCERPC_PKT_BIND_NAK:
|
|
DEBUG(0, ("Error - DCERPC_PKT_BINDACK/DCERPC_PKT_BINDNACK "
|
|
"packet type %u received.\n",
|
|
(unsigned int)pkt->ptype));
|
|
break;
|
|
|
|
|
|
case DCERPC_PKT_ALTER:
|
|
/*
|
|
* We assume that a pipe bind is only in one pdu.
|
|
*/
|
|
reply = api_pipe_alter_context(p, pkt);
|
|
break;
|
|
|
|
case DCERPC_PKT_ALTER_RESP:
|
|
DEBUG(0, ("Error - DCERPC_PKT_ALTER_RESP received: "
|
|
"Should only be server -> client.\n"));
|
|
break;
|
|
|
|
case DCERPC_PKT_AUTH3:
|
|
/*
|
|
* The third packet in an auth exchange.
|
|
*/
|
|
reply = api_pipe_bind_auth3(p, pkt);
|
|
break;
|
|
|
|
case DCERPC_PKT_SHUTDOWN:
|
|
DEBUG(0, ("Error - DCERPC_PKT_SHUTDOWN received: "
|
|
"Should only be server -> client.\n"));
|
|
break;
|
|
|
|
case DCERPC_PKT_CO_CANCEL:
|
|
/* For now just free all client data and continue
|
|
* processing. */
|
|
DEBUG(3,("process_complete_pdu: DCERPC_PKT_CO_CANCEL."
|
|
" Abandoning rpc call.\n"));
|
|
/* As we never do asynchronous RPC serving, we can
|
|
* never cancel a call (as far as I know).
|
|
* If we ever did we'd have to send a cancel_ack reply.
|
|
* For now, just free all client data and continue
|
|
* processing. */
|
|
reply = True;
|
|
break;
|
|
|
|
#if 0
|
|
/* Enable this if we're doing async rpc. */
|
|
/* We must check the outstanding callid matches. */
|
|
if (pipe_init_outgoing_data(p)) {
|
|
/* Send a cancel_ack PDU reply. */
|
|
/* We should probably check the auth-verifier here. */
|
|
reply = setup_cancel_ack_reply(p, pkt);
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case DCERPC_PKT_ORPHANED:
|
|
/* We should probably check the auth-verifier here.
|
|
* For now just free all client data and continue
|
|
* processing. */
|
|
DEBUG(3, ("process_complete_pdu: DCERPC_PKT_ORPHANED."
|
|
" Abandoning rpc call.\n"));
|
|
reply = True;
|
|
break;
|
|
|
|
default:
|
|
DEBUG(0, ("process_complete_pdu: "
|
|
"Unknown rpc type = %u received.\n",
|
|
(unsigned int)pkt->ptype));
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (!reply) {
|
|
DEBUG(3,("DCE/RPC fault sent!"));
|
|
set_incoming_fault(p);
|
|
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
|
|
}
|
|
/* pkt and p->in_data.pdu.data freed by caller */
|
|
}
|
|
|