/*
* Unix SMB/CIFS implementation.
* RPC Pipe client / server routines
* Almost completely rewritten by (C) Jeremy Allison 2005 - 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
/* this module apparently provides an implementation of DCE/RPC over a
* named pipe (IPC$ connection using SMBtrans). details of DCE/RPC
* documentation are available (in on-line form) from the X-Open group.
*
* this module should provide a level of abstraction between SMB
* and DCE/RPC, while minimising the amount of mallocs, unnecessary
* data copies, and network traffic.
*
*/
#include "includes.h"
#include "../librpc/gen_ndr/ndr_schannel.h"
#include "../libcli/auth/schannel.h"
#include "../libcli/auth/spnego.h"
#include "ntlmssp.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV
static void free_pipe_ntlmssp_auth_data(struct pipe_auth_data *auth)
{
AUTH_NTLMSSP_STATE *a = auth->a_u.auth_ntlmssp_state;
if (a) {
auth_ntlmssp_end(&a);
}
auth->a_u.auth_ntlmssp_state = NULL;
}
static DATA_BLOB generic_session_key(void)
{
return data_blob("SystemLibraryDTC", 16);
}
/*******************************************************************
Generate the next PDU to be returned from the data in p->rdata.
Handle NTLMSSP.
********************************************************************/
static bool create_next_pdu_ntlmssp(pipes_struct *p)
{
RPC_HDR_RESP hdr_resp;
uint32 ss_padding_len = 0;
uint32 data_space_available;
uint32 data_len_left;
uint32 data_len;
NTSTATUS status;
DATA_BLOB auth_blob;
RPC_HDR_AUTH auth_info;
uint8 auth_type, auth_level;
AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;
/*
* If we're in the fault state, keep returning fault PDU's until
* the pipe gets closed. JRA.
*/
if(p->fault_state) {
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));
/* Change the incoming request header to a response. */
p->hdr.pkt_type = DCERPC_PKT_RESPONSE;
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
p->hdr.flags = DCERPC_PFC_FLAG_FIRST;
} else {
p->hdr.flags = 0;
}
/*
* Work out how much we can fit in a single PDU.
*/
data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;
/*
* Ensure there really is data left to send.
*/
if(!data_len_left) {
DEBUG(0,("create_next_pdu_ntlmssp: no data left to send !\n"));
return False;
}
/* Space available - not including padding. */
data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN -
RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - NTLMSSP_SIG_SIZE;
/*
* The amount we send is the minimum of the available
* space and the amount left to send.
*/
data_len = MIN(data_len_left, data_space_available);
/* Work out any padding alignment requirements. */
if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_ntlmssp: adding sign/seal padding of %u\n",
ss_padding_len ));
/* If we're over filling the packet, we need to make space
* for the padding at the end of the data. */
if (data_len + ss_padding_len > data_space_available) {
data_len -= SERVER_NDR_PADDING_SIZE;
}
}
/*
* Set up the alloc hint. This should be the data left to
* send.
*/
hdr_resp.alloc_hint = data_len_left;
/*
* Work out if this PDU will be the last.
*/
if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
p->hdr.flags |= DCERPC_PFC_FLAG_LAST;
}
/*
* Set up the header lengths.
*/
p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN +
data_len + ss_padding_len +
RPC_HDR_AUTH_LEN + NTLMSSP_SIG_SIZE;
p->hdr.auth_len = NTLMSSP_SIG_SIZE;
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/* Store the header in the data stream. */
if(!smb_io_rpc_hdr("hdr", &p->hdr, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_RESP.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Copy the data into the PDU. */
if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata,
p->out_data.data_sent_length, data_len)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to copy %u bytes of data.\n", (unsigned int)data_len));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Copy the sign/seal padding data. */
if (ss_padding_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!prs_copy_data_in(&p->out_data.frag, pad,
ss_padding_len)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes of pad data.\n",
(unsigned int)ss_padding_len));
prs_mem_free(&p->out_data.frag);
return False;
}
}
/* Now write out the auth header and null blob. */
if (p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) {
auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
} else {
auth_type = DCERPC_AUTH_TYPE_SPNEGO;
}
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
auth_level = DCERPC_AUTH_LEVEL_PRIVACY;
} else {
auth_level = DCERPC_AUTH_LEVEL_INTEGRITY;
}
init_rpc_hdr_auth(&auth_info, auth_type, auth_level, ss_padding_len, 1 /* context id. */);
if (!smb_io_rpc_hdr_auth("hdr_auth", &auth_info,
&p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_AUTH.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Generate the sign blob. */
switch (p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
/* Data portion is encrypted. */
status = ntlmssp_seal_packet(
a->ntlmssp_state,
(uint8_t *)prs_data_p(&p->out_data.frag)
+ RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
data_len + ss_padding_len,
(unsigned char *)prs_data_p(&p->out_data.frag),
(size_t)prs_offset(&p->out_data.frag),
&auth_blob);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&auth_blob);
prs_mem_free(&p->out_data.frag);
return False;
}
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
/* Data is signed. */
status = ntlmssp_sign_packet(
a->ntlmssp_state,
(unsigned char *)prs_data_p(&p->out_data.frag)
+ RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
data_len + ss_padding_len,
(unsigned char *)prs_data_p(&p->out_data.frag),
(size_t)prs_offset(&p->out_data.frag),
&auth_blob);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&auth_blob);
prs_mem_free(&p->out_data.frag);
return False;
}
break;
default:
prs_mem_free(&p->out_data.frag);
return False;
}
/* Append the auth blob. */
if (!prs_copy_data_in(&p->out_data.frag, (char *)auth_blob.data,
NTLMSSP_SIG_SIZE)) {
DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes auth blob.\n",
(unsigned int)NTLMSSP_SIG_SIZE));
data_blob_free(&auth_blob);
prs_mem_free(&p->out_data.frag);
return False;
}
data_blob_free(&auth_blob);
/*
* Setup the counts for this PDU.
*/
p->out_data.data_sent_length += data_len;
p->out_data.current_pdu_sent = 0;
return True;
}
/*******************************************************************
Generate the next PDU to be returned from the data in p->rdata.
Return an schannel authenticated fragment.
********************************************************************/
static bool create_next_pdu_schannel(pipes_struct *p)
{
RPC_HDR_RESP hdr_resp;
uint32 ss_padding_len = 0;
uint32 data_len;
uint32 data_space_available;
uint32 data_len_left;
uint32 data_pos;
NTSTATUS status;
/*
* If we're in the fault state, keep returning fault PDU's until
* the pipe gets closed. JRA.
*/
if(p->fault_state) {
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));
/* Change the incoming request header to a response. */
p->hdr.pkt_type = DCERPC_PKT_RESPONSE;
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
p->hdr.flags = DCERPC_PFC_FLAG_FIRST;
} else {
p->hdr.flags = 0;
}
/*
* Work out how much we can fit in a single PDU.
*/
data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;
/*
* Ensure there really is data left to send.
*/
if(!data_len_left) {
DEBUG(0,("create_next_pdu_schannel: no data left to send !\n"));
return False;
}
/* Space available - not including padding. */
data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN
- RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN
- RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
/*
* The amount we send is the minimum of the available
* space and the amount left to send.
*/
data_len = MIN(data_len_left, data_space_available);
/* Work out any padding alignment requirements. */
if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_schannel: adding sign/seal padding of %u\n",
ss_padding_len ));
/* If we're over filling the packet, we need to make space
* for the padding at the end of the data. */
if (data_len + ss_padding_len > data_space_available) {
data_len -= SERVER_NDR_PADDING_SIZE;
}
}
/*
* Set up the alloc hint. This should be the data left to
* send.
*/
hdr_resp.alloc_hint = data_len_left;
/*
* Work out if this PDU will be the last.
*/
if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
p->hdr.flags |= DCERPC_PFC_FLAG_LAST;
}
p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len + ss_padding_len +
RPC_HDR_AUTH_LEN + RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
p->hdr.auth_len = RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/* Store the header in the data stream. */
if(!smb_io_rpc_hdr("hdr", &p->hdr, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_RESP.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Store the current offset. */
data_pos = prs_offset(&p->out_data.frag);
/* Copy the data into the PDU. */
if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata,
p->out_data.data_sent_length, data_len)) {
DEBUG(0,("create_next_pdu_schannel: failed to copy %u bytes of data.\n", (unsigned int)data_len));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Copy the sign/seal padding data. */
if (ss_padding_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!prs_copy_data_in(&p->out_data.frag, pad,
ss_padding_len)) {
DEBUG(0,("create_next_pdu_schannel: failed to add %u bytes of pad data.\n", (unsigned int)ss_padding_len));
prs_mem_free(&p->out_data.frag);
return False;
}
}
{
/*
* Schannel processing.
*/
RPC_HDR_AUTH auth_info;
DATA_BLOB blob;
uint8_t *data;
/* Check it's the type of reply we were expecting to decode */
init_rpc_hdr_auth(&auth_info,
DCERPC_AUTH_TYPE_SCHANNEL,
p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY ?
DCERPC_AUTH_LEVEL_PRIVACY : DCERPC_AUTH_LEVEL_INTEGRITY,
ss_padding_len, 1);
if (!smb_io_rpc_hdr_auth("hdr_auth", &auth_info,
&p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_AUTH.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
data = (uint8_t *)prs_data_p(&p->out_data.frag) + data_pos;
switch (p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
status = netsec_outgoing_packet(p->auth.a_u.schannel_auth,
talloc_tos(),
true,
data,
data_len + ss_padding_len,
&blob);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = netsec_outgoing_packet(p->auth.a_u.schannel_auth,
talloc_tos(),
false,
data,
data_len + ss_padding_len,
&blob);
break;
default:
status = NT_STATUS_INTERNAL_ERROR;
break;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("create_next_pdu_schannel: failed to process packet: %s\n",
nt_errstr(status)));
prs_mem_free(&p->out_data.frag);
return false;
}
/* Finally marshall the blob. */
if (DEBUGLEVEL >= 10) {
dump_NL_AUTH_SIGNATURE(talloc_tos(), &blob);
}
if (!prs_copy_data_in(&p->out_data.frag, (const char *)blob.data, blob.length)) {
prs_mem_free(&p->out_data.frag);
return false;
}
}
/*
* Setup the counts for this PDU.
*/
p->out_data.data_sent_length += data_len;
p->out_data.current_pdu_sent = 0;
return True;
}
/*******************************************************************
Generate the next PDU to be returned from the data in p->rdata.
No authentication done.
********************************************************************/
static bool create_next_pdu_noauth(pipes_struct *p)
{
RPC_HDR_RESP hdr_resp;
uint32 data_len;
uint32 data_space_available;
uint32 data_len_left;
/*
* If we're in the fault state, keep returning fault PDU's until
* the pipe gets closed. JRA.
*/
if(p->fault_state) {
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));
/* Change the incoming request header to a response. */
p->hdr.pkt_type = DCERPC_PKT_RESPONSE;
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
p->hdr.flags = DCERPC_PFC_FLAG_FIRST;
} else {
p->hdr.flags = 0;
}
/*
* Work out how much we can fit in a single PDU.
*/
data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length;
/*
* Ensure there really is data left to send.
*/
if(!data_len_left) {
DEBUG(0,("create_next_pdu_noath: no data left to send !\n"));
return False;
}
data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN
- RPC_HDR_RESP_LEN;
/*
* The amount we send is the minimum of the available
* space and the amount left to send.
*/
data_len = MIN(data_len_left, data_space_available);
/*
* Set up the alloc hint. This should be the data left to
* send.
*/
hdr_resp.alloc_hint = data_len_left;
/*
* Work out if this PDU will be the last.
*/
if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) {
p->hdr.flags |= DCERPC_PFC_FLAG_LAST;
}
/*
* Set up the header lengths.
*/
p->hdr.frag_len = RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len;
p->hdr.auth_len = 0;
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/* Store the header in the data stream. */
if(!smb_io_rpc_hdr("hdr", &p->hdr, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_noath: failed to marshall RPC_HDR.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) {
DEBUG(0,("create_next_pdu_noath: failed to marshall RPC_HDR_RESP.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Copy the data into the PDU. */
if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata,
p->out_data.data_sent_length, data_len)) {
DEBUG(0,("create_next_pdu_noauth: failed to copy %u bytes of data.\n", (unsigned int)data_len));
prs_mem_free(&p->out_data.frag);
return False;
}
/*
* Setup the counts for this PDU.
*/
p->out_data.data_sent_length += data_len;
p->out_data.current_pdu_sent = 0;
return True;
}
/*******************************************************************
Generate the next PDU to be returned from the data in p->rdata.
********************************************************************/
bool create_next_pdu(pipes_struct *p)
{
switch(p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_NONE:
case DCERPC_AUTH_LEVEL_CONNECT:
/* This is incorrect for auth level connect. Fixme. JRA */
return create_next_pdu_noauth(p);
default:
switch(p->auth.auth_type) {
case PIPE_AUTH_TYPE_NTLMSSP:
case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
return create_next_pdu_ntlmssp(p);
case PIPE_AUTH_TYPE_SCHANNEL:
return create_next_pdu_schannel(p);
default:
break;
}
}
DEBUG(0,("create_next_pdu: invalid internal auth level %u / type %u",
(unsigned int)p->auth.auth_level,
(unsigned int)p->auth.auth_type));
return False;
}
/*******************************************************************
Process an NTLMSSP authentication response.
If this function succeeds, the user has been authenticated
and their domain, name and calling workstation stored in
the pipe struct.
*******************************************************************/
static bool pipe_ntlmssp_verify_final(pipes_struct *p, DATA_BLOB *p_resp_blob)
{
DATA_BLOB session_key, reply;
NTSTATUS status;
AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;
bool ret;
DEBUG(5,("pipe_ntlmssp_verify_final: pipe %s checking user details\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
ZERO_STRUCT(reply);
/* this has to be done as root in order to verify the password */
become_root();
status = auth_ntlmssp_update(a, *p_resp_blob, &reply);
unbecome_root();
/* Don't generate a reply. */
data_blob_free(&reply);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
/* 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. */
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_INTEGRITY) {
if (!(a->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet integrity requested "
"but client declined signing.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
return False;
}
}
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
if (!(a->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet privacy requested "
"but client declined sealing.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
return False;
}
}
DEBUG(5, ("pipe_ntlmssp_verify_final: OK: user: %s domain: %s "
"workstation: %s\n", a->ntlmssp_state->user,
a->ntlmssp_state->domain,
a->ntlmssp_state->client.netbios_name));
if (a->server_info->ptok == NULL) {
DEBUG(1,("Error: Authmodule failed to provide nt_user_token\n"));
return False;
}
TALLOC_FREE(p->server_info);
p->server_info = copy_serverinfo(p, a->server_info);
if (p->server_info == NULL) {
DEBUG(0, ("copy_serverinfo failed\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.
*/
session_key = generic_session_key();
if (session_key.data == NULL) {
return False;
}
ret = server_info_set_session_key(p->server_info, session_key);
data_blob_free(&session_key);
return True;
}
/*******************************************************************
The switch table for the pipe names and the functions to handle them.
*******************************************************************/
struct rpc_table {
struct {
const char *clnt;
const char *srv;
} pipe;
struct ndr_syntax_id rpc_interface;
const struct api_struct *cmds;
int n_cmds;
};
static struct rpc_table *rpc_lookup;
static int rpc_lookup_size;
/*******************************************************************
This is the "stage3" NTLMSSP response after a bind request and reply.
*******************************************************************/
bool api_pipe_bind_auth3(pipes_struct *p, prs_struct *rpc_in_p)
{
RPC_HDR_AUTH auth_info;
uint32 pad = 0;
DATA_BLOB blob;
uint32_t auth_len = p->hdr.auth_len;
ZERO_STRUCT(blob);
DEBUG(5,("api_pipe_bind_auth3: decode request. %d\n", __LINE__));
if (auth_len == 0) {
DEBUG(0,("api_pipe_bind_auth3: No auth field sent !\n"));
goto err;
}
/* 4 bytes padding. */
if (!prs_uint32("pad", rpc_in_p, 0, &pad)) {
DEBUG(0,("api_pipe_bind_auth3: unmarshall of 4 byte pad failed.\n"));
goto err;
}
/* Ensure there's enough data for an authenticated request. */
if (RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + auth_len >
p->hdr.frag_len) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_len "
"%u is too large.\n",
(unsigned int)auth_len ));
goto err;
}
/*
* Decode the authentication verifier response.
*/
/* Pull the auth header and the following data into a blob. */
/* NB. The offset of the auth_header is relative to the *end*
* of the packet, not the start. Also, the length of the
* data in rpc_in_p is p->hdr.frag_len - RPC_HEADER_LEN,
* as the RPC header isn't included in rpc_in_p. */
if(!prs_set_offset(rpc_in_p,
p->hdr.frag_len - RPC_HEADER_LEN -
RPC_HDR_AUTH_LEN - auth_len)) {
DEBUG(0,("api_pipe_bind_auth3: cannot move "
"offset to %u.\n",
(unsigned int)(p->hdr.frag_len -
RPC_HDR_AUTH_LEN - auth_len) ));
goto err;
}
if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, rpc_in_p, 0)) {
DEBUG(0,("api_pipe_bind_auth3: failed to "
"unmarshall RPC_HDR_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 != DCERPC_AUTH_TYPE_NTLMSSP) {
DEBUG(0,("api_pipe_bind_auth3: incorrect auth type (%u).\n",
(unsigned int)auth_info.auth_type ));
return False;
}
blob = data_blob(NULL,p->hdr.auth_len);
if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
DEBUG(0,("api_pipe_bind_auth3: Failed to pull %u bytes - the response blob.\n",
(unsigned int)p->hdr.auth_len ));
goto err;
}
/*
* The following call actually checks the challenge/response data.
* for correctness against the given DOMAIN\user name.
*/
if (!pipe_ntlmssp_verify_final(p, &blob)) {
goto err;
}
data_blob_free(&blob);
p->pipe_bound = True;
return True;
err:
data_blob_free(&blob);
free_pipe_ntlmssp_auth_data(&p->auth);
p->auth.a_u.auth_ntlmssp_state = NULL;
return False;
}
/*******************************************************************
Marshall a bind_nak pdu.
*******************************************************************/
static bool setup_bind_nak(pipes_struct *p)
{
RPC_HDR nak_hdr;
uint16 zero = 0;
/* Free any memory in the current return data buffer. */
prs_mem_free(&p->out_data.rdata);
/*
* 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.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/*
* Initialize a bind_nak header.
*/
init_rpc_hdr(&nak_hdr, DCERPC_PKT_BIND_NAK, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST,
p->hdr.call_id, RPC_HEADER_LEN + sizeof(uint16), 0);
/*
* Marshall the header into the outgoing PDU.
*/
if(!smb_io_rpc_hdr("", &nak_hdr, &p->out_data.frag, 0)) {
DEBUG(0,("setup_bind_nak: marshalling of RPC_HDR failed.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/*
* Now add the reject reason.
*/
if(!prs_uint16("reject code", &p->out_data.frag, 0, &zero)) {
prs_mem_free(&p->out_data.frag);
return False;
}
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
if (p->auth.auth_data_free_func) {
(*p->auth.auth_data_free_func)(&p->auth);
}
p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE;
p->auth.auth_type = PIPE_AUTH_TYPE_NONE;
p->pipe_bound = False;
return True;
}
/*******************************************************************
Marshall a fault pdu.
*******************************************************************/
bool setup_fault_pdu(pipes_struct *p, NTSTATUS status)
{
RPC_HDR fault_hdr;
RPC_HDR_RESP hdr_resp;
RPC_HDR_FAULT fault_resp;
/* Free any memory in the current return data buffer. */
prs_mem_free(&p->out_data.rdata);
/*
* 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.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/*
* Initialize a fault header.
*/
init_rpc_hdr(&fault_hdr, DCERPC_PKT_FAULT, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST | DCERPC_PFC_FLAG_DID_NOT_EXECUTE,
p->hdr.call_id, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + RPC_HDR_FAULT_LEN, 0);
/*
* Initialize the HDR_RESP and FAULT parts of the PDU.
*/
memset((char *)&hdr_resp, '\0', sizeof(hdr_resp));
fault_resp.status = status;
fault_resp.reserved = 0;
/*
* Marshall the header into the outgoing PDU.
*/
if(!smb_io_rpc_hdr("", &fault_hdr, &p->out_data.frag, 0)) {
DEBUG(0,("setup_fault_pdu: marshalling of RPC_HDR failed.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) {
DEBUG(0,("setup_fault_pdu: failed to marshall RPC_HDR_RESP.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!smb_io_rpc_hdr_fault("fault", &fault_resp, &p->out_data.frag, 0)) {
DEBUG(0,("setup_fault_pdu: failed to marshall RPC_HDR_FAULT.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
return True;
}
#if 0
/*******************************************************************
Marshall a cancel_ack pdu.
We should probably check the auth-verifier here.
*******************************************************************/
bool setup_cancel_ack_reply(pipes_struct *p, prs_struct *rpc_in_p)
{
prs_struct outgoing_pdu;
RPC_HDR ack_reply_hdr;
/* Free any memory in the current return data buffer. */
prs_mem_free(&p->out_data.rdata);
/*
* 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.
*/
prs_init_empty( &outgoing_pdu, p->mem_ctx, MARSHALL);
prs_give_memory( &outgoing_pdu, (char *)p->out_data.current_pdu, sizeof(p->out_data.current_pdu), False);
/*
* Initialize a cancel_ack header.
*/
init_rpc_hdr(&ack_reply_hdr, DCERPC_PKT_CANCEL_ACK, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST,
p->hdr.call_id, RPC_HEADER_LEN, 0);
/*
* Marshall the header into the outgoing PDU.
*/
if(!smb_io_rpc_hdr("", &ack_reply_hdr, &outgoing_pdu, 0)) {
DEBUG(0,("setup_cancel_ack_reply: marshalling of RPC_HDR failed.\n"));
prs_mem_free(&outgoing_pdu);
return False;
}
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_len = prs_offset(&outgoing_pdu);
p->out_data.current_pdu_sent = 0;
prs_mem_free(&outgoing_pdu);
return True;
}
#endif
/*******************************************************************
Ensure a bind request has the correct abstract & transfer interface.
Used to reject unknown binds from Win2k.
*******************************************************************/
static bool check_bind_req(struct pipes_struct *p,
struct ndr_syntax_id* abstract,
struct ndr_syntax_id* transfer,
uint32 context_id)
{
int i=0;
struct pipe_rpc_fns *context_fns;
DEBUG(3,("check_bind_req for %s\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* we have to check all now since win2k introduced a new UUID on the lsaprpc pipe */
for (i=0; icmds = rpc_lookup[i].cmds;
context_fns->n_cmds = rpc_lookup[i].n_cmds;
context_fns->context_id = context_id;
/* add to the list of open contexts */
DLIST_ADD( p->contexts, context_fns );
return True;
}
/*******************************************************************
Register commands to an RPC pipe
*******************************************************************/
NTSTATUS rpc_srv_register(int version, const char *clnt, const char *srv,
const struct ndr_interface_table *iface,
const struct api_struct *cmds, int size)
{
struct rpc_table *rpc_entry;
if (!clnt || !srv || !cmds) {
return NT_STATUS_INVALID_PARAMETER;
}
if (version != SMB_RPC_INTERFACE_VERSION) {
DEBUG(0,("Can't register rpc commands!\n"
"You tried to register a rpc module with SMB_RPC_INTERFACE_VERSION %d"
", while this version of samba uses version %d!\n",
version,SMB_RPC_INTERFACE_VERSION));
return NT_STATUS_OBJECT_TYPE_MISMATCH;
}
/* TODO:
*
* we still need to make sure that don't register the same commands twice!!!
*
* --metze
*/
/* We use a temporary variable because this call can fail and
rpc_lookup will still be valid afterwards. It could then succeed if
called again later */
rpc_lookup_size++;
rpc_entry = SMB_REALLOC_ARRAY_KEEP_OLD_ON_ERROR(rpc_lookup, struct rpc_table, rpc_lookup_size);
if (NULL == rpc_entry) {
rpc_lookup_size--;
DEBUG(0, ("rpc_pipe_register_commands: memory allocation failed\n"));
return NT_STATUS_NO_MEMORY;
} else {
rpc_lookup = rpc_entry;
}
rpc_entry = rpc_lookup + (rpc_lookup_size - 1);
ZERO_STRUCTP(rpc_entry);
rpc_entry->pipe.clnt = SMB_STRDUP(clnt);
rpc_entry->pipe.srv = SMB_STRDUP(srv);
rpc_entry->rpc_interface = iface->syntax_id;
rpc_entry->cmds = cmds;
rpc_entry->n_cmds = size;
return NT_STATUS_OK;
}
/**
* Is a named pipe known?
* @param[in] cli_filename The pipe name requested by the client
* @result Do we want to serve this?
*/
bool is_known_pipename(const char *cli_filename, struct ndr_syntax_id *syntax)
{
const char *pipename = cli_filename;
int i;
NTSTATUS status;
if (strnequal(pipename, "\\PIPE\\", 6)) {
pipename += 5;
}
if (*pipename == '\\') {
pipename += 1;
}
if (lp_disable_spoolss() && strequal(pipename, "spoolss")) {
DEBUG(10, ("refusing spoolss access\n"));
return false;
}
for (i=0; ihdr.auth_len);
if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to pull %u bytes - the SPNEGO auth header.\n",
(unsigned int)p->hdr.auth_len ));
goto err;
}
if (blob.data[0] != ASN1_APPLICATION(0)) {
goto err;
}
/* parse out the OIDs and the first sec blob */
if (!parse_negTokenTarg(blob, OIDs, &secblob)) {
DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to parse the security blob.\n"));
goto err;
}
if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 || strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
got_kerberos_mechanism = true;
}
for (i=0;OIDs[i];i++) {
DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got OID %s\n", OIDs[i]));
TALLOC_FREE(OIDs[i]);
}
DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got secblob of size %lu\n", (unsigned long)secblob.length));
if ( got_kerberos_mechanism && ((lp_security()==SEC_ADS) || USE_KERBEROS_KEYTAB) ) {
bool ret = pipe_spnego_auth_bind_kerberos(p, rpc_in_p, pauth_info, &secblob, pout_auth);
data_blob_free(&secblob);
data_blob_free(&blob);
return ret;
}
if (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP && p->auth.a_u.auth_ntlmssp_state) {
/* Free any previous auth type. */
free_pipe_ntlmssp_auth_data(&p->auth);
}
if (!got_kerberos_mechanism) {
/* Initialize the NTLM engine. */
status = auth_ntlmssp_start(&a);
if (!NT_STATUS_IS_OK(status)) {
goto err;
}
/*
* Pass the first security blob of data to it.
* This can return an error or NT_STATUS_MORE_PROCESSING_REQUIRED
* which means we need another packet to complete the bind.
*/
status = auth_ntlmssp_update(a, secblob, &chal);
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(3,("pipe_spnego_auth_bind_negotiate: auth_ntlmssp_update failed.\n"));
goto err;
}
/* Generate the response blob we need for step 2 of the bind. */
response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
} else {
/*
* SPNEGO negotiate down to NTLMSSP. The subsequent
* code to process follow-up packets is not complete
* yet. JRA.
*/
response = spnego_gen_auth_response(NULL,
NT_STATUS_MORE_PROCESSING_REQUIRED,
OID_NTLMSSP);
}
/* auth_pad_len will be handled by the caller */
/* Copy the blob into the pout_auth parse struct */
init_rpc_hdr_auth(&auth_info, DCERPC_AUTH_TYPE_SPNEGO,
pauth_info->auth_level, ss_padding_len, 1);
if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
DEBUG(0,("pipe_spnego_auth_bind_negotiate: marshalling of RPC_HDR_AUTH failed.\n"));
goto err;
}
if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
DEBUG(0,("pipe_spnego_auth_bind_negotiate: marshalling of data blob failed.\n"));
goto err;
}
p->auth.a_u.auth_ntlmssp_state = a;
p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
p->auth.auth_type = PIPE_AUTH_TYPE_SPNEGO_NTLMSSP;
data_blob_free(&blob);
data_blob_free(&secblob);
data_blob_free(&chal);
data_blob_free(&response);
/* We can't set pipe_bound True yet - we need an RPC_ALTER_CONTEXT response packet... */
return True;
err:
data_blob_free(&blob);
data_blob_free(&secblob);
data_blob_free(&chal);
data_blob_free(&response);
p->auth.a_u.auth_ntlmssp_state = NULL;
return False;
}
/*******************************************************************
Handle the second part of a SPNEGO bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_continue(pipes_struct *p, prs_struct *rpc_in_p,
uint32_t ss_padding_len,
RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
RPC_HDR_AUTH auth_info;
DATA_BLOB spnego_blob;
DATA_BLOB auth_blob;
DATA_BLOB auth_reply;
DATA_BLOB response;
AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;
ZERO_STRUCT(spnego_blob);
ZERO_STRUCT(auth_blob);
ZERO_STRUCT(auth_reply);
ZERO_STRUCT(response);
/*
* NB. If we've negotiated down from krb5 to NTLMSSP we'll currently
* fail here as 'a' == NULL.
*/
if (p->auth.auth_type != PIPE_AUTH_TYPE_SPNEGO_NTLMSSP || !a) {
DEBUG(0,("pipe_spnego_auth_bind_continue: not in NTLMSSP auth state.\n"));
goto err;
}
/* Grab the SPNEGO blob. */
spnego_blob = data_blob(NULL,p->hdr.auth_len);
if (!prs_copy_data_out((char *)spnego_blob.data, rpc_in_p, p->hdr.auth_len)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: Failed to pull %u bytes - the SPNEGO auth header.\n",
(unsigned int)p->hdr.auth_len ));
goto err;
}
if (spnego_blob.data[0] != ASN1_CONTEXT(1)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob type.\n"));
goto err;
}
if (!spnego_parse_auth(spnego_blob, &auth_blob)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob.\n"));
goto err;
}
/*
* The following call actually checks the challenge/response data.
* for correctness against the given DOMAIN\user name.
*/
if (!pipe_ntlmssp_verify_final(p, &auth_blob)) {
goto err;
}
data_blob_free(&spnego_blob);
data_blob_free(&auth_blob);
/* Generate the spnego "accept completed" blob - no incoming data. */
response = spnego_gen_auth_response(&auth_reply, NT_STATUS_OK, OID_NTLMSSP);
/* FIXME - add auth_pad_len here ! */
/* Copy the blob into the pout_auth parse struct */
init_rpc_hdr_auth(&auth_info, DCERPC_AUTH_TYPE_SPNEGO,
pauth_info->auth_level, ss_padding_len, 1);
if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: marshalling of RPC_HDR_AUTH failed.\n"));
goto err;
}
if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: marshalling of data blob failed.\n"));
goto err;
}
data_blob_free(&auth_reply);
data_blob_free(&response);
p->pipe_bound = True;
return True;
err:
data_blob_free(&spnego_blob);
data_blob_free(&auth_blob);
data_blob_free(&auth_reply);
data_blob_free(&response);
free_pipe_ntlmssp_auth_data(&p->auth);
p->auth.a_u.auth_ntlmssp_state = NULL;
return False;
}
/*******************************************************************
Handle an schannel bind auth.
*******************************************************************/
static bool pipe_schannel_auth_bind(pipes_struct *p, prs_struct *rpc_in_p,
uint32_t ss_padding_len,
RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
RPC_HDR_AUTH auth_info;
struct NL_AUTH_MESSAGE neg;
struct NL_AUTH_MESSAGE reply;
bool ret;
NTSTATUS status;
struct netlogon_creds_CredentialState *creds;
DATA_BLOB session_key;
enum ndr_err_code ndr_err;
DATA_BLOB blob;
blob = data_blob_const(prs_data_p(rpc_in_p) + prs_offset(rpc_in_p),
prs_data_size(rpc_in_p));
ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), &neg,
(ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0,("pipe_schannel_auth_bind: Could not unmarshal SCHANNEL auth neg\n"));
return false;
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &neg);
}
if (!(neg.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME)) {
DEBUG(0,("pipe_schannel_auth_bind: Did not receive netbios computer name\n"));
return false;
}
/*
* The neg.oem_netbios_computer.a key here must match the remote computer name
* given in the DOM_CLNT_SRV.uni_comp_name used on all netlogon pipe
* operations that use credentials.
*/
become_root();
status = schannel_get_creds_state(p, lp_private_dir(),
neg.oem_netbios_computer.a, &creds);
unbecome_root();
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("pipe_schannel_auth_bind: Attempt to bind using schannel without successful serverauth2\n"));
return False;
}
p->auth.a_u.schannel_auth = talloc(p, struct schannel_state);
if (!p->auth.a_u.schannel_auth) {
TALLOC_FREE(creds);
return False;
}
p->auth.a_u.schannel_auth->state = SCHANNEL_STATE_START;
p->auth.a_u.schannel_auth->seq_num = 0;
p->auth.a_u.schannel_auth->initiator = false;
p->auth.a_u.schannel_auth->creds = creds;
/*
* JRA. Should we also copy the schannel session key into the pipe session key p->session_key
* here ? We do that for NTLMSSP, but the session key is already set up from the vuser
* struct of the person who opened the pipe. I need to test this further. JRA.
*
* VL. As we are mapping this to guest set the generic key
* "SystemLibraryDTC" key here. It's a bit difficult to test against
* W2k3, as it does not allow schannel binds against SAMR and LSA
* anymore.
*/
session_key = generic_session_key();
if (session_key.data == NULL) {
DEBUG(0, ("pipe_schannel_auth_bind: Could not alloc session"
" key\n"));
return false;
}
ret = server_info_set_session_key(p->server_info, session_key);
data_blob_free(&session_key);
if (!ret) {
DEBUG(0, ("server_info_set_session_key failed\n"));
return false;
}
init_rpc_hdr_auth(&auth_info, DCERPC_AUTH_TYPE_SCHANNEL,
pauth_info->auth_level, ss_padding_len, 1);
if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
DEBUG(0,("pipe_schannel_auth_bind: marshalling of RPC_HDR_AUTH failed.\n"));
return False;
}
/*** SCHANNEL verifier ***/
reply.MessageType = NL_NEGOTIATE_RESPONSE;
reply.Flags = 0;
reply.Buffer.dummy = 5; /* ??? actually I don't think
* this has any meaning
* here - gd */
ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &reply,
(ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0,("Failed to marshall NL_AUTH_MESSAGE.\n"));
return false;
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &reply);
}
if (!prs_copy_data_in(pout_auth, (const char *)blob.data, blob.length)) {
return false;
}
DEBUG(10,("pipe_schannel_auth_bind: schannel auth: domain [%s] myname [%s]\n",
neg.oem_netbios_domain.a, neg.oem_netbios_computer.a));
/* We're finished with this bind - no more packets. */
p->auth.auth_data_free_func = NULL;
p->auth.auth_type = PIPE_AUTH_TYPE_SCHANNEL;
p->pipe_bound = True;
return True;
}
/*******************************************************************
Handle an NTLMSSP bind auth.
*******************************************************************/
static bool pipe_ntlmssp_auth_bind(pipes_struct *p, prs_struct *rpc_in_p,
uint32_t ss_padding_len,
RPC_HDR_AUTH *pauth_info, prs_struct *pout_auth)
{
RPC_HDR_AUTH auth_info;
DATA_BLOB blob;
DATA_BLOB response;
NTSTATUS status;
AUTH_NTLMSSP_STATE *a = NULL;
ZERO_STRUCT(blob);
ZERO_STRUCT(response);
/* Grab the NTLMSSP blob. */
blob = data_blob(NULL,p->hdr.auth_len);
if (!prs_copy_data_out((char *)blob.data, rpc_in_p, p->hdr.auth_len)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: Failed to pull %u bytes - the NTLM auth header.\n",
(unsigned int)p->hdr.auth_len ));
goto err;
}
if (strncmp((char *)blob.data, "NTLMSSP", 7) != 0) {
DEBUG(0,("pipe_ntlmssp_auth_bind: Failed to read NTLMSSP in blob\n"));
goto err;
}
/* We have an NTLMSSP blob. */
status = auth_ntlmssp_start(&a);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_start failed: %s\n",
nt_errstr(status) ));
goto err;
}
status = auth_ntlmssp_update(a, blob, &response);
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_update failed: %s\n",
nt_errstr(status) ));
goto err;
}
data_blob_free(&blob);
/* Copy the blob into the pout_auth parse struct */
init_rpc_hdr_auth(&auth_info, DCERPC_AUTH_TYPE_NTLMSSP,
pauth_info->auth_level, ss_padding_len, 1);
if(!smb_io_rpc_hdr_auth("", &auth_info, pout_auth, 0)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: marshalling of RPC_HDR_AUTH failed.\n"));
goto err;
}
if (!prs_copy_data_in(pout_auth, (char *)response.data, response.length)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: marshalling of data blob failed.\n"));
goto err;
}
p->auth.a_u.auth_ntlmssp_state = a;
p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
p->auth.auth_type = PIPE_AUTH_TYPE_NTLMSSP;
data_blob_free(&blob);
data_blob_free(&response);
DEBUG(10,("pipe_ntlmssp_auth_bind: NTLMSSP auth started\n"));
/* We can't set pipe_bound True yet - we need an DCERPC_PKT_AUTH3 response packet... */
return True;
err:
data_blob_free(&blob);
data_blob_free(&response);
free_pipe_ntlmssp_auth_data(&p->auth);
p->auth.a_u.auth_ntlmssp_state = NULL;
return False;
}
/*******************************************************************
Respond to a pipe bind request.
*******************************************************************/
bool api_pipe_bind_req(pipes_struct *p, prs_struct *rpc_in_p)
{
RPC_HDR_BA hdr_ba;
RPC_HDR_RB hdr_rb;
RPC_HDR_AUTH auth_info;
uint16 assoc_gid;
fstring ack_pipe_name;
prs_struct out_hdr_ba;
prs_struct out_auth;
int i = 0;
int auth_len = 0;
unsigned int auth_type = DCERPC_AUTH_TYPE_NONE;
uint32_t ss_padding_len = 0;
/* No rebinds on a bound pipe - use alter context. */
if (p->pipe_bound) {
DEBUG(2,("api_pipe_bind_req: rejecting bind request on bound "
"pipe %s.\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
return setup_bind_nak(p);
}
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/*
* 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.
*/
/*
* Setup the memory to marshall the ba header, and the
* auth footers.
*/
if(!prs_init(&out_hdr_ba, 1024, p->mem_ctx, MARSHALL)) {
DEBUG(0,("api_pipe_bind_req: malloc out_hdr_ba failed.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!prs_init(&out_auth, 1024, p->mem_ctx, MARSHALL)) {
DEBUG(0,("api_pipe_bind_req: malloc out_auth failed.\n"));
prs_mem_free(&p->out_data.frag);
prs_mem_free(&out_hdr_ba);
return False;
}
DEBUG(5,("api_pipe_bind_req: decode request. %d\n", __LINE__));
ZERO_STRUCT(hdr_rb);
/* decode the bind request */
if(!smb_io_rpc_hdr_rb("", &hdr_rb, rpc_in_p, 0)) {
DEBUG(0,("api_pipe_bind_req: unable to unmarshall RPC_HDR_RB "
"struct.\n"));
goto err_exit;
}
if (hdr_rb.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.
*/
for (i = 0; i < rpc_lookup_size; i++) {
if (ndr_syntax_id_equal(&rpc_lookup[i].rpc_interface,
&hdr_rb.rpc_context[0].abstract)) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_lookup[i].pipe.clnt, rpc_lookup[i].pipe.srv));
break;
}
}
if (i == rpc_lookup_size) {
NTSTATUS status;
status = smb_probe_module(
"rpc", get_pipe_name_from_syntax(
talloc_tos(),
&hdr_rb.rpc_context[0].abstract));
if (NT_STATUS_IS_ERR(status)) {
DEBUG(3,("api_pipe_bind_req: Unknown pipe name %s in bind request.\n",
get_pipe_name_from_syntax(
talloc_tos(),
&hdr_rb.rpc_context[0].abstract)));
prs_mem_free(&p->out_data.frag);
prs_mem_free(&out_hdr_ba);
prs_mem_free(&out_auth);
return setup_bind_nak(p);
}
for (i = 0; i < rpc_lookup_size; i++) {
if (strequal(rpc_lookup[i].pipe.clnt,
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax))) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_lookup[i].pipe.clnt, rpc_lookup[i].pipe.srv));
break;
}
}
if (i == rpc_lookup_size) {
DEBUG(0, ("module %s doesn't provide functions for "
"pipe %s!\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax),
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
goto err_exit;
}
}
/* name has to be \PIPE\xxxxx */
fstrcpy(ack_pipe_name, "\\PIPE\\");
fstrcat(ack_pipe_name, rpc_lookup[i].pipe.srv);
DEBUG(5,("api_pipe_bind_req: make response. %d\n", __LINE__));
assoc_gid = hdr_rb.bba.assoc_gid ? hdr_rb.bba.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, &hdr_rb.rpc_context[0].abstract, &hdr_rb.rpc_context[0].transfer[0],
hdr_rb.rpc_context[0].context_id )) {
init_rpc_hdr_ba(&hdr_ba,
RPC_MAX_PDU_FRAG_LEN,
RPC_MAX_PDU_FRAG_LEN,
assoc_gid,
ack_pipe_name,
0x1, 0x0, 0x0,
&hdr_rb.rpc_context[0].transfer[0]);
} else {
/* Rejection reason: abstract syntax not supported */
init_rpc_hdr_ba(&hdr_ba, RPC_MAX_PDU_FRAG_LEN,
RPC_MAX_PDU_FRAG_LEN, assoc_gid,
ack_pipe_name, 0x1, 0x2, 0x1,
&null_ndr_syntax_id);
p->pipe_bound = False;
}
/*
* and marshall it.
*/
if(!smb_io_rpc_hdr_ba("", &hdr_ba, &out_hdr_ba, 0)) {
DEBUG(0,("api_pipe_bind_req: marshalling of RPC_HDR_BA failed.\n"));
goto err_exit;
}
/*
* Check if this is an authenticated bind request.
*/
if (p->hdr.auth_len) {
/*
* Decode the authentication verifier.
*/
/* Work out any padding needed before the auth footer. */
if ((RPC_HEADER_LEN + prs_offset(&out_hdr_ba)) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + prs_offset(&out_hdr_ba)) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("api_pipe_bind_req: auth pad_len = %u\n",
(unsigned int)ss_padding_len ));
}
/* Quick length check. Won't catch a bad auth footer,
* prevents overrun. */
if (p->hdr.frag_len < RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + p->hdr.auth_len) {
DEBUG(0,("api_pipe_bind_req: auth_len (%u) "
"too long for fragment %u.\n",
(unsigned int)p->hdr.auth_len,
(unsigned int)p->hdr.frag_len ));
goto err_exit;
}
/* Pull the auth header and the following data into a blob. */
/* NB. The offset of the auth_header is relative to the *end*
* of the packet, not the start. Also, the length of the
* data in rpc_in_p is p->hdr.frag_len - RPC_HEADER_LEN,
* as the RPC header isn't included in rpc_in_p. */
if(!prs_set_offset(rpc_in_p,
p->hdr.frag_len - RPC_HEADER_LEN -
RPC_HDR_AUTH_LEN - p->hdr.auth_len)) {
DEBUG(0,("api_pipe_bind_req: cannot move "
"offset to %u.\n",
(unsigned int)(p->hdr.frag_len -
RPC_HDR_AUTH_LEN - p->hdr.auth_len) ));
goto err_exit;
}
if(!smb_io_rpc_hdr_auth("", &auth_info, rpc_in_p, 0)) {
DEBUG(0,("api_pipe_bind_req: unable to unmarshall RPC_HDR_AUTH struct.\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;
default:
DEBUG(0,("api_pipe_bind_req: unexpected auth level (%u).\n",
(unsigned int)auth_info.auth_level ));
goto err_exit;
}
} else {
ZERO_STRUCT(auth_info);
}
switch(auth_type) {
case DCERPC_AUTH_TYPE_NTLMSSP:
if (!pipe_ntlmssp_auth_bind(p, rpc_in_p,
ss_padding_len, &auth_info, &out_auth)) {
goto err_exit;
}
assoc_gid = 0x7a77;
break;
case DCERPC_AUTH_TYPE_SCHANNEL:
if (!pipe_schannel_auth_bind(p, rpc_in_p,
ss_padding_len, &auth_info, &out_auth)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_SPNEGO:
if (!pipe_spnego_auth_bind_negotiate(p, rpc_in_p,
ss_padding_len, &auth_info, &out_auth)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_NONE:
/* Unauthenticated bind request. */
/* We're finished - no more packets. */
p->auth.auth_type = PIPE_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 */
ss_padding_len = 0;
break;
default:
DEBUG(0,("api_pipe_bind_req: unknown auth type %x requested.\n", auth_type ));
goto err_exit;
}
/*
* Create the header, now we know the length.
*/
if (prs_offset(&out_auth)) {
auth_len = prs_offset(&out_auth) - RPC_HDR_AUTH_LEN;
}
init_rpc_hdr(&p->hdr, DCERPC_PKT_BIND_ACK, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST,
p->hdr.call_id,
RPC_HEADER_LEN + prs_offset(&out_hdr_ba) +
ss_padding_len + prs_offset(&out_auth),
auth_len);
/*
* Marshall the header into the outgoing PDU.
*/
if(!smb_io_rpc_hdr("", &p->hdr, &p->out_data.frag, 0)) {
DEBUG(0,("api_pipe_bind_req: marshalling of RPC_HDR failed.\n"));
goto err_exit;
}
/*
* Now add the RPC_HDR_BA and any auth needed.
*/
if(!prs_append_prs_data(&p->out_data.frag, &out_hdr_ba)) {
DEBUG(0,("api_pipe_bind_req: append of RPC_HDR_BA failed.\n"));
goto err_exit;
}
if (auth_len) {
if (ss_padding_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!prs_copy_data_in(&p->out_data.frag, pad,
ss_padding_len)) {
DEBUG(0,("api_pipe_bind_req: failed to add %u "
"bytes of pad data.\n",
(unsigned int)ss_padding_len));
goto err_exit;
}
}
if (!prs_append_prs_data( &p->out_data.frag, &out_auth)) {
DEBUG(0,("api_pipe_bind_req: 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;
prs_mem_free(&out_hdr_ba);
prs_mem_free(&out_auth);
return True;
err_exit:
prs_mem_free(&p->out_data.frag);
prs_mem_free(&out_hdr_ba);
prs_mem_free(&out_auth);
return setup_bind_nak(p);
}
/****************************************************************************
Deal with an alter context call. Can be third part of 3 leg auth request for
SPNEGO calls.
****************************************************************************/
bool api_pipe_alter_context(pipes_struct *p, prs_struct *rpc_in_p)
{
RPC_HDR_BA hdr_ba;
RPC_HDR_RB hdr_rb;
RPC_HDR_AUTH auth_info;
uint16 assoc_gid;
fstring ack_pipe_name;
prs_struct out_hdr_ba;
prs_struct out_auth;
int auth_len = 0;
uint32_t ss_padding_len = 0;
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
/*
* 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.
*/
/*
* Setup the memory to marshall the ba header, and the
* auth footers.
*/
if(!prs_init(&out_hdr_ba, 1024, p->mem_ctx, MARSHALL)) {
DEBUG(0,("api_pipe_alter_context: malloc out_hdr_ba failed.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
if(!prs_init(&out_auth, 1024, p->mem_ctx, MARSHALL)) {
DEBUG(0,("api_pipe_alter_context: malloc out_auth failed.\n"));
prs_mem_free(&p->out_data.frag);
prs_mem_free(&out_hdr_ba);
return False;
}
ZERO_STRUCT(hdr_rb);
DEBUG(5,("api_pipe_alter_context: decode request. %d\n", __LINE__));
/* decode the alter context request */
if(!smb_io_rpc_hdr_rb("", &hdr_rb, rpc_in_p, 0)) {
DEBUG(0,("api_pipe_alter_context: unable to unmarshall RPC_HDR_RB struct.\n"));
goto err_exit;
}
/* secondary address CAN be NULL
* as the specs say it's ignored.
* It MUST be NULL to have the spoolss working.
*/
fstrcpy(ack_pipe_name,"");
DEBUG(5,("api_pipe_alter_context: make response. %d\n", __LINE__));
assoc_gid = hdr_rb.bba.assoc_gid ? hdr_rb.bba.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, &hdr_rb.rpc_context[0].abstract, &hdr_rb.rpc_context[0].transfer[0],
hdr_rb.rpc_context[0].context_id )) {
init_rpc_hdr_ba(&hdr_ba,
RPC_MAX_PDU_FRAG_LEN,
RPC_MAX_PDU_FRAG_LEN,
assoc_gid,
ack_pipe_name,
0x1, 0x0, 0x0,
&hdr_rb.rpc_context[0].transfer[0]);
} else {
/* Rejection reason: abstract syntax not supported */
init_rpc_hdr_ba(&hdr_ba, RPC_MAX_PDU_FRAG_LEN,
RPC_MAX_PDU_FRAG_LEN, assoc_gid,
ack_pipe_name, 0x1, 0x2, 0x1,
&null_ndr_syntax_id);
p->pipe_bound = False;
}
/*
* and marshall it.
*/
if(!smb_io_rpc_hdr_ba("", &hdr_ba, &out_hdr_ba, 0)) {
DEBUG(0,("api_pipe_alter_context: marshalling of RPC_HDR_BA failed.\n"));
goto err_exit;
}
/*
* Check if this is an authenticated alter context request.
*/
if (p->hdr.auth_len != 0) {
/*
* Decode the authentication verifier.
*/
/* Work out any padding needed before the auth footer. */
if ((RPC_HEADER_LEN + prs_offset(&out_hdr_ba)) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + prs_offset(&out_hdr_ba)) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("api_pipe_alter_context: auth pad_len = %u\n",
(unsigned int)ss_padding_len ));
}
/* Quick length check. Won't catch a bad auth footer,
* prevents overrun. */
if (p->hdr.frag_len < RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + p->hdr.auth_len) {
DEBUG(0,("api_pipe_alter_context: auth_len (%u) "
"too long for fragment %u.\n",
(unsigned int)p->hdr.auth_len,
(unsigned int)p->hdr.frag_len ));
goto err_exit;
}
/* Pull the auth header and the following data into a blob. */
/* NB. The offset of the auth_header is relative to the *end*
* of the packet, not the start. Also, the length of the
* data in rpc_in_p is p->hdr.frag_len - RPC_HEADER_LEN,
* as the RPC header isn't included in rpc_in_p. */
if(!prs_set_offset(rpc_in_p,
p->hdr.frag_len - RPC_HEADER_LEN -
RPC_HDR_AUTH_LEN - p->hdr.auth_len)) {
DEBUG(0,("api_alter_context: cannot move "
"offset to %u.\n",
(unsigned int)(p->hdr.frag_len -
RPC_HDR_AUTH_LEN - p->hdr.auth_len) ));
goto err_exit;
}
if(!smb_io_rpc_hdr_auth("", &auth_info, rpc_in_p, 0)) {
DEBUG(0,("api_pipe_alter_context: unable to unmarshall RPC_HDR_AUTH struct.\n"));
goto err_exit;
}
/*
* Currently only the SPNEGO auth type uses the alter ctx
* response in place of the NTLMSSP auth3 type.
*/
if (auth_info.auth_type == DCERPC_AUTH_TYPE_SPNEGO) {
/* We can only finish if the pipe is unbound. */
if (!p->pipe_bound) {
if (!pipe_spnego_auth_bind_continue(p, rpc_in_p,
ss_padding_len, &auth_info, &out_auth)) {
goto err_exit;
}
} else {
goto err_exit;
}
}
} else {
ZERO_STRUCT(auth_info);
}
/*
* Create the header, now we know the length.
*/
if (prs_offset(&out_auth)) {
auth_len = prs_offset(&out_auth) - RPC_HDR_AUTH_LEN;
}
init_rpc_hdr(&p->hdr, DCERPC_PKT_ALTER_RESP, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST,
p->hdr.call_id,
RPC_HEADER_LEN + prs_offset(&out_hdr_ba) + prs_offset(&out_auth),
auth_len);
/*
* Marshall the header into the outgoing PDU.
*/
if(!smb_io_rpc_hdr("", &p->hdr, &p->out_data.frag, 0)) {
DEBUG(0,("api_pipe_alter_context: marshalling of RPC_HDR failed.\n"));
goto err_exit;
}
/*
* Now add the RPC_HDR_BA and any auth needed.
*/
if(!prs_append_prs_data(&p->out_data.frag, &out_hdr_ba)) {
DEBUG(0,("api_pipe_alter_context: append of RPC_HDR_BA failed.\n"));
goto err_exit;
}
if (auth_len) {
if (ss_padding_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!prs_copy_data_in(&p->out_data.frag, pad,
ss_padding_len)) {
DEBUG(0,("api_pipe_alter_context: failed to add %u "
"bytes of pad data.\n",
(unsigned int)ss_padding_len));
goto err_exit;
}
}
if (!prs_append_prs_data( &p->out_data.frag, &out_auth)) {
DEBUG(0,("api_pipe_alter_context: 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;
prs_mem_free(&out_hdr_ba);
prs_mem_free(&out_auth);
return True;
err_exit:
prs_mem_free(&p->out_data.frag);
prs_mem_free(&out_hdr_ba);
prs_mem_free(&out_auth);
return setup_bind_nak(p);
}
/****************************************************************************
Deal with NTLMSSP sign & seal processing on an RPC request.
****************************************************************************/
bool api_pipe_ntlmssp_auth_process(pipes_struct *p, prs_struct *rpc_in,
uint32 *p_ss_padding_len, NTSTATUS *pstatus)
{
RPC_HDR_AUTH auth_info;
uint32 auth_len = p->hdr.auth_len;
uint32 save_offset = prs_offset(rpc_in);
AUTH_NTLMSSP_STATE *a = p->auth.a_u.auth_ntlmssp_state;
unsigned char *data = NULL;
size_t data_len;
unsigned char *full_packet_data = NULL;
size_t full_packet_data_len;
DATA_BLOB auth_blob;
*pstatus = NT_STATUS_OK;
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_NONE || p->auth.auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
return True;
}
if (!a) {
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
/* Ensure there's enough data for an authenticated request. */
if (RPC_HEADER_LEN + RPC_HDR_REQ_LEN + RPC_HDR_AUTH_LEN
+ auth_len > p->hdr.frag_len) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_len %u is too large.\n",
(unsigned int)auth_len ));
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
/*
* We need the full packet data + length (minus auth stuff) as well as the packet data + length
* after the RPC header.
* We need to pass in the full packet (minus auth len) to the NTLMSSP sign and check seal
* functions as NTLMv2 checks the rpc headers also.
* Both of these values include any auth_pad_len bytes.
*/
data = (unsigned char *)(prs_data_p(rpc_in) + RPC_HDR_REQ_LEN);
data_len = (size_t)(p->hdr.frag_len - RPC_HEADER_LEN - RPC_HDR_REQ_LEN - RPC_HDR_AUTH_LEN - auth_len);
full_packet_data = p->in_data.current_in_pdu;
full_packet_data_len = p->hdr.frag_len - auth_len;
/* Pull the auth header and the following data into a blob. */
/* NB. The offset of the auth_header is relative to the *end*
* of the packet, not the start. Also, the length of the
* data in rpc_in_p is p->hdr.frag_len - RPC_HEADER_LEN,
* as the RPC header isn't included in rpc_in_p. */
if(!prs_set_offset(rpc_in,
p->hdr.frag_len - RPC_HEADER_LEN -
RPC_HDR_AUTH_LEN - auth_len)) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: cannot move "
"offset to %u.\n",
(unsigned int)(p->hdr.frag_len -
RPC_HDR_AUTH_LEN - auth_len) ));
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, rpc_in, 0)) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: failed to "
"unmarshall RPC_HDR_AUTH.\n"));
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
/* Ensure auth_pad_len fits into the packet. */
if (RPC_HEADER_LEN + RPC_HDR_REQ_LEN + auth_info.auth_pad_len +
RPC_HDR_AUTH_LEN + auth_len > p->hdr.frag_len) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_info.auth_pad_len "
"too large (%u), auth_len (%u), frag_len = (%u).\n",
(unsigned int)auth_info.auth_pad_len,
(unsigned int)auth_len,
(unsigned int)p->hdr.frag_len ));
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
auth_blob.data = (unsigned char *)prs_data_p(rpc_in) + prs_offset(rpc_in);
auth_blob.length = auth_len;
switch (p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
/* Data is encrypted. */
*pstatus = ntlmssp_unseal_packet(a->ntlmssp_state,
data, data_len,
full_packet_data,
full_packet_data_len,
&auth_blob);
if (!NT_STATUS_IS_OK(*pstatus)) {
return False;
}
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
/* Data is signed. */
*pstatus = ntlmssp_check_packet(a->ntlmssp_state,
data, data_len,
full_packet_data,
full_packet_data_len,
&auth_blob);
if (!NT_STATUS_IS_OK(*pstatus)) {
return False;
}
break;
default:
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
/*
* Return the current pointer to the data offset.
*/
if(!prs_set_offset(rpc_in, save_offset)) {
DEBUG(0,("api_pipe_auth_process: failed to set offset back to %u\n",
(unsigned int)save_offset ));
*pstatus = NT_STATUS_INVALID_PARAMETER;
return False;
}
/*
* Remember the padding length. We must remove it from the real data
* stream once the sign/seal is done.
*/
*p_ss_padding_len = auth_info.auth_pad_len;
return True;
}
/****************************************************************************
Deal with schannel processing on an RPC request.
****************************************************************************/
bool api_pipe_schannel_process(pipes_struct *p, prs_struct *rpc_in, uint32 *p_ss_padding_len)
{
uint32 data_len;
uint32 auth_len;
uint32 save_offset = prs_offset(rpc_in);
RPC_HDR_AUTH auth_info;
DATA_BLOB blob;
NTSTATUS status;
uint8_t *data;
auth_len = p->hdr.auth_len;
if (auth_len < RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN ||
auth_len > RPC_HEADER_LEN +
RPC_HDR_REQ_LEN +
RPC_HDR_AUTH_LEN +
auth_len) {
DEBUG(0,("Incorrect auth_len %u.\n", (unsigned int)auth_len ));
return False;
}
/*
* The following is that length of the data we must verify or unseal.
* This doesn't include the RPC headers or the auth_len or the RPC_HDR_AUTH_LEN
* preceeding the auth_data, but does include the auth_pad_len bytes.
*/
if (p->hdr.frag_len < RPC_HEADER_LEN + RPC_HDR_REQ_LEN + RPC_HDR_AUTH_LEN + auth_len) {
DEBUG(0,("Incorrect frag %u, auth %u.\n",
(unsigned int)p->hdr.frag_len,
(unsigned int)auth_len ));
return False;
}
data_len = p->hdr.frag_len - RPC_HEADER_LEN - RPC_HDR_REQ_LEN -
RPC_HDR_AUTH_LEN - auth_len;
DEBUG(5,("data %d auth %d\n", data_len, auth_len));
/* Pull the auth header and the following data into a blob. */
/* NB. The offset of the auth_header is relative to the *end*
* of the packet, not the start. Also, the length of the
* data in rpc_in_p is p->hdr.frag_len - RPC_HEADER_LEN,
* as the RPC header isn't included in rpc_in_p. */
if(!prs_set_offset(rpc_in,
p->hdr.frag_len - RPC_HEADER_LEN -
RPC_HDR_AUTH_LEN - auth_len)) {
DEBUG(0,("api_pipe_schannel_process: cannot move "
"offset to %u.\n",
(unsigned int)(p->hdr.frag_len -
RPC_HDR_AUTH_LEN - auth_len) ));
return False;
}
if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, rpc_in, 0)) {
DEBUG(0,("api_pipe_schannel_process: failed to "
"unmarshall RPC_HDR_AUTH.\n"));
return False;
}
/* Ensure auth_pad_len fits into the packet. */
if (RPC_HEADER_LEN + RPC_HDR_REQ_LEN + auth_info.auth_pad_len +
RPC_HDR_AUTH_LEN + auth_len > p->hdr.frag_len) {
DEBUG(0,("api_pipe_schannel_process: auth_info.auth_pad_len "
"too large (%u), auth_len (%u), frag_len = (%u).\n",
(unsigned int)auth_info.auth_pad_len,
(unsigned int)auth_len,
(unsigned int)p->hdr.frag_len ));
return False;
}
if (auth_info.auth_type != DCERPC_AUTH_TYPE_SCHANNEL) {
DEBUG(0,("Invalid auth info %d on schannel\n",
auth_info.auth_type));
return False;
}
blob = data_blob_const(prs_data_p(rpc_in) + prs_offset(rpc_in), auth_len);
if (DEBUGLEVEL >= 10) {
dump_NL_AUTH_SIGNATURE(talloc_tos(), &blob);
}
data = (uint8_t *)prs_data_p(rpc_in)+RPC_HDR_REQ_LEN;
switch (auth_info.auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
status = netsec_incoming_packet(p->auth.a_u.schannel_auth,
talloc_tos(),
true,
data,
data_len,
&blob);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = netsec_incoming_packet(p->auth.a_u.schannel_auth,
talloc_tos(),
false,
data,
data_len,
&blob);
break;
default:
status = NT_STATUS_INTERNAL_ERROR;
break;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("failed to unseal packet: %s\n", nt_errstr(status)));
return false;
}
/*
* Return the current pointer to the data offset.
*/
if(!prs_set_offset(rpc_in, save_offset)) {
DEBUG(0,("failed to set offset back to %u\n",
(unsigned int)save_offset ));
return False;
}
/*
* Remember the padding length. We must remove it from the real data
* stream once the sign/seal is done.
*/
*p_ss_padding_len = auth_info.auth_pad_len;
return True;
}
/****************************************************************************
Find the set of RPC functions associated with this context_id
****************************************************************************/
static PIPE_RPC_FNS* find_pipe_fns_by_context( PIPE_RPC_FNS *list, uint32 context_id )
{
PIPE_RPC_FNS *fns = NULL;
if ( !list ) {
DEBUG(0,("find_pipe_fns_by_context: ERROR! No context list for pipe!\n"));
return NULL;
}
for (fns=list; fns; fns=fns->next ) {
if ( fns->context_id == context_id )
return fns;
}
return NULL;
}
/****************************************************************************
Memory cleanup.
****************************************************************************/
void free_pipe_rpc_context( PIPE_RPC_FNS *list )
{
PIPE_RPC_FNS *tmp = list;
PIPE_RPC_FNS *tmp2;
while (tmp) {
tmp2 = tmp->next;
SAFE_FREE(tmp);
tmp = tmp2;
}
return;
}
static bool api_rpcTNP(pipes_struct *p,
const struct api_struct *api_rpc_cmds, int n_cmds);
/****************************************************************************
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.
****************************************************************************/
bool api_pipe_request(pipes_struct *p)
{
bool ret = False;
bool changed_user = False;
PIPE_RPC_FNS *pipe_fns;
if (p->pipe_bound &&
((p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) ||
(p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP))) {
if(!become_authenticated_pipe_user(p)) {
prs_mem_free(&p->out_data.rdata);
return False;
}
changed_user = True;
}
DEBUG(5, ("Requested \\PIPE\\%s\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* get the set of RPC functions for this context */
pipe_fns = find_pipe_fns_by_context(p->contexts, p->hdr_req.context_id);
if ( pipe_fns ) {
TALLOC_CTX *frame = talloc_stackframe();
ret = api_rpcTNP(p, pipe_fns->cmds, pipe_fns->n_cmds);
TALLOC_FREE(frame);
}
else {
DEBUG(0,("api_pipe_request: No rpc function table associated with context [%d] on pipe [%s]\n",
p->hdr_req.context_id,
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
}
if (changed_user) {
unbecome_authenticated_pipe_user();
}
return ret;
}
/*******************************************************************
Calls the underlying RPC function for a named pipe.
********************************************************************/
static bool api_rpcTNP(pipes_struct *p,
const struct api_struct *api_rpc_cmds, int n_cmds)
{
int fn_num;
uint32 offset1, offset2;
/* interpret the command */
DEBUG(4,("api_rpcTNP: %s op 0x%x - ",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
p->hdr_req.opnum));
if (DEBUGLEVEL >= 50) {
fstring name;
slprintf(name, sizeof(name)-1, "in_%s",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax));
prs_dump(name, p->hdr_req.opnum, &p->in_data.data);
}
for (fn_num = 0; fn_num < n_cmds; fn_num++) {
if (api_rpc_cmds[fn_num].opnum == p->hdr_req.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 = prs_offset(&p->out_data.rdata);
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",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
api_rpc_cmds[fn_num].name));
prs_mem_free(&p->out_data.rdata);
return False;
}
if (p->bad_handle_fault_state) {
DEBUG(4,("api_rpcTNP: bad handle fault return.\n"));
p->bad_handle_fault_state = False;
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_CONTEXT_MISMATCH));
return True;
}
if (p->rng_fault_state) {
DEBUG(4, ("api_rpcTNP: rng fault return\n"));
p->rng_fault_state = False;
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
offset2 = prs_offset(&p->out_data.rdata);
prs_set_offset(&p->out_data.rdata, offset1);
if (DEBUGLEVEL >= 50) {
fstring name;
slprintf(name, sizeof(name)-1, "out_%s",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax));
prs_dump(name, p->hdr_req.opnum, &p->out_data.rdata);
}
prs_set_offset(&p->out_data.rdata, offset2);
DEBUG(5,("api_rpcTNP: called %s successfully\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* Check for buffer underflow in rpc parsing */
if ((DEBUGLEVEL >= 10) &&
(prs_offset(&p->in_data.data) != prs_data_size(&p->in_data.data))) {
size_t data_len = prs_data_size(&p->in_data.data) - prs_offset(&p->in_data.data);
char *data = (char *)SMB_MALLOC(data_len);
DEBUG(10, ("api_rpcTNP: rpc input buffer underflow (parse error?)\n"));
if (data) {
prs_uint8s(False, "", &p->in_data.data, 0, (unsigned char *)data, (uint32)data_len);
SAFE_FREE(data);
}
}
return True;
}