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|
/*
* 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 <http://www.gnu.org/licenses/>.
*/
/* 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 "srv_pipe_internal.h"
#include "../librpc/gen_ndr/ndr_schannel.h"
#include "../libcli/auth/schannel.h"
#include "../libcli/auth/spnego.h"
#include "../libcli/auth/ntlmssp.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV
static void free_pipe_ntlmssp_auth_data(struct pipe_auth_data *auth)
{
struct 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)
{
DATA_BLOB hdr;
uint8_t hdr_flags;
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;
struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state;
TALLOC_CTX *frame;
/*
* 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));
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
hdr_flags = DCERPC_PFC_FLAG_FIRST;
} else {
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)) {
hdr_flags |= DCERPC_PFC_FLAG_LAST;
}
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
status = dcerpc_push_ncacn_packet_header(
prs_get_mem_context(&p->out_data.frag),
DCERPC_PKT_RESPONSE,
hdr_flags,
RPC_HEADER_LEN + RPC_HDR_RESP_LEN +
data_len + ss_padding_len +
RPC_HDR_AUTH_LEN + NTLMSSP_SIG_SIZE,
NTLMSSP_SIG_SIZE,
p->call_id,
&hdr);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall RPC Header.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Store the header in the data stream. */
if (!prs_copy_data_in(&p->out_data.frag,
(char *)hdr.data, hdr.length)) {
DEBUG(0, ("Out of memory.\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. */
frame = talloc_stackframe();
switch (p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_PRIVACY:
/* Data portion is encrypted. */
status = auth_ntlmssp_seal_packet(
a, frame,
(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)) {
talloc_free(frame);
prs_mem_free(&p->out_data.frag);
return False;
}
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
/* Data is signed. */
status = auth_ntlmssp_sign_packet(
a, frame,
(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)) {
talloc_free(frame);
prs_mem_free(&p->out_data.frag);
return False;
}
break;
default:
talloc_free(frame);
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));
talloc_free(frame);
prs_mem_free(&p->out_data.frag);
return False;
}
talloc_free(frame);
/*
* 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)
{
DATA_BLOB hdr;
uint8_t hdr_flags;
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));
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
hdr_flags = DCERPC_PFC_FLAG_FIRST;
} else {
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)) {
hdr_flags |= DCERPC_PFC_FLAG_LAST;
}
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
status = dcerpc_push_ncacn_packet_header(
prs_get_mem_context(&p->out_data.frag),
DCERPC_PKT_RESPONSE,
hdr_flags,
RPC_HEADER_LEN + RPC_HDR_RESP_LEN +
data_len + ss_padding_len +
RPC_HDR_AUTH_LEN +
RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN,
RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN,
p->call_id,
&hdr);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall RPC Header.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Store the header in the data stream. */
if (!prs_copy_data_in(&p->out_data.frag,
(char *)hdr.data, hdr.length)) {
DEBUG(0, ("Out of memory.\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)
{
DATA_BLOB hdr;
uint8_t hdr_flags;
NTSTATUS status;
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));
/* Set up rpc header flags. */
if (p->out_data.data_sent_length == 0) {
hdr_flags = DCERPC_PFC_FLAG_FIRST;
} else {
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)) {
hdr_flags |= DCERPC_PFC_FLAG_LAST;
}
/*
* Init the parse struct to point at the outgoing
* data.
*/
prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL);
status = dcerpc_push_ncacn_packet_header(
prs_get_mem_context(&p->out_data.frag),
DCERPC_PKT_RESPONSE,
hdr_flags,
RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len,
0,
p->call_id,
&hdr);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall RPC Header.\n"));
prs_mem_free(&p->out_data.frag);
return False;
}
/* Store the header in the data stream. */
if (!prs_copy_data_in(&p->out_data.frag,
(char *)hdr.data, hdr.length)) {
DEBUG(0, ("Out of memory.\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;
struct 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 (!auth_ntlmssp_negotiated_sign(a)) {
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 (!auth_ntlmssp_negotiated_seal(a)) {
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",
auth_ntlmssp_get_username(a),
auth_ntlmssp_get_domain(a),
auth_ntlmssp_get_client(a)));
TALLOC_FREE(p->server_info);
p->server_info = auth_ntlmssp_server_info(p, a);
if (p->server_info == NULL) {
DEBUG(0, ("auth_ntlmssp_server_info failed to obtain the server info for authenticated user\n"));
return false;
}
if (p->server_info->ptok == NULL) {
DEBUG(1,("Error: Authmodule failed to provide nt_user_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.
*/
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;
}
/*******************************************************************
This is the "stage3" NTLMSSP response after a bind request and reply.
*******************************************************************/
bool api_pipe_bind_auth3(pipes_struct *p, struct ncacn_packet *pkt)
{
struct dcerpc_auth auth_info;
uint32_t auth_len = pkt->auth_length;
NTSTATUS status;
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;
}
/* Ensure there's enough data for an authenticated request. */
if (RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + auth_len >
pkt->frag_length) {
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.
*/
status = dcerpc_pull_dcerpc_auth(pkt,
&pkt->u.auth3.auth_info,
&auth_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("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 != DCERPC_AUTH_TYPE_NTLMSSP) {
DEBUG(0,("api_pipe_bind_auth3: incorrect auth type (%u).\n",
(unsigned int)auth_info.auth_type ));
return False;
}
/*
* The following call actually checks the challenge/response data.
* for correctness against the given DOMAIN\user name.
*/
if (!pipe_ntlmssp_verify_final(p, &auth_info.credentials)) {
goto err;
}
p->pipe_bound = True;
return True;
err:
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, struct ncacn_packet *pkt)
{
NTSTATUS status;
union dcerpc_payload u;
DATA_BLOB blob;
/* 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.
*/
ZERO_STRUCT(u);
u.bind_nak.reject_reason = 0;
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_BIND_NAK,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST,
0,
pkt->call_id,
&u,
&blob);
if (!NT_STATUS_IS_OK(status)) {
prs_mem_free(&p->out_data.frag);
return False;
}
if (!prs_copy_data_in(&p->out_data.frag,
(char *)blob.data, blob.length)) {
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 fault_status)
{
NTSTATUS status;
union dcerpc_payload u;
DATA_BLOB blob;
/* 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.
*/
ZERO_STRUCT(u);
u.fault.status = NT_STATUS_V(fault_status);
u.fault._pad = data_blob_talloc_zero(p->mem_ctx, 4);
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_FAULT,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST |
DCERPC_PFC_FLAG_DID_NOT_EXECUTE,
0,
p->call_id,
&u,
&blob);
if (!NT_STATUS_IS_OK(status)) {
prs_mem_free(&p->out_data.frag);
return False;
}
if (!prs_copy_data_in(&p->out_data.frag,
(char *)blob.data, blob.length)) {
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;
}
/*******************************************************************
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)
{
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 */
if (rpc_srv_pipe_exists_by_id(abstract) &&
ndr_syntax_id_equal(transfer, &ndr_transfer_syntax)) {
DEBUG(3, ("check_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_srv_get_pipe_cli_name(abstract),
rpc_srv_get_pipe_srv_name(abstract)));
} else {
return false;
}
context_fns = SMB_MALLOC_P(struct pipe_rpc_fns);
if (context_fns == NULL) {
DEBUG(0,("check_bind_req: malloc() failed!\n"));
return False;
}
context_fns->n_cmds = rpc_srv_get_pipe_num_cmds(abstract);
context_fns->cmds = rpc_srv_get_pipe_cmds(abstract);
context_fns->context_id = context_id;
/* add to the list of open contexts */
DLIST_ADD( p->contexts, context_fns );
return True;
}
/**
* 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;
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;
}
if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
return true;
}
status = smb_probe_module("rpc", pipename);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("is_known_pipename: %s unknown\n", cli_filename));
return false;
}
DEBUG(10, ("is_known_pipename: %s loaded dynamically\n", pipename));
/*
* Scan the list again for the interface id
*/
if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
return true;
}
DEBUG(10, ("is_known_pipename: pipe %s did not register itself!\n",
pipename));
return false;
}
/*******************************************************************
Handle a SPNEGO krb5 bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_kerberos(pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *pauth_info,
DATA_BLOB *psecblob,
DATA_BLOB *response)
{
return False;
}
/*******************************************************************
Handle the first part of a SPNEGO bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_negotiate(pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *pauth_info,
DATA_BLOB *response)
{
DATA_BLOB secblob;
DATA_BLOB chal;
char *OIDs[ASN1_MAX_OIDS];
int i;
NTSTATUS status;
bool got_kerberos_mechanism = false;
struct auth_ntlmssp_state *a = NULL;
ZERO_STRUCT(secblob);
ZERO_STRUCT(chal);
if (pauth_info->credentials.data[0] != ASN1_APPLICATION(0)) {
goto err;
}
/* parse out the OIDs and the first sec blob */
if (!parse_negTokenTarg(pauth_info->credentials, 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;
ret = pipe_spnego_auth_bind_kerberos(p, mem_ctx, pauth_info,
&secblob, response);
data_blob_free(&secblob);
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;
}
switch (pauth_info->auth_level) {
case DCERPC_AUTH_LEVEL_INTEGRITY:
auth_ntlmssp_want_sign(a);
break;
case DCERPC_AUTH_LEVEL_PRIVACY:
auth_ntlmssp_want_seal(a);
break;
default:
break;
}
/*
* 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);
}
/* Make sure data is bound to the memctx, to be freed the caller */
talloc_steal(mem_ctx, response->data);
/* auth_pad_len will be handled by the caller */
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(&secblob);
data_blob_free(&chal);
/* We can't set pipe_bound True yet - we need an RPC_ALTER_CONTEXT response packet... */
return True;
err:
data_blob_free(&secblob);
data_blob_free(&chal);
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,
uint32_t ss_padding_len,
struct dcerpc_auth *pauth_info,
prs_struct *pout_auth)
{
RPC_HDR_AUTH auth_info;
DATA_BLOB auth_blob;
DATA_BLOB auth_reply;
DATA_BLOB response;
struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state;
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;
}
if (pauth_info->credentials.data[0] != ASN1_CONTEXT(1)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob type.\n"));
goto err;
}
if (!spnego_parse_auth(pauth_info->credentials, &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(&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(&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,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *auth_info,
DATA_BLOB *response)
{
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;
ndr_err = ndr_pull_struct_blob(
&auth_info->credentials, mem_ctx, &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;
}
/*** 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(response, mem_ctx, &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);
}
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,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *auth_info,
DATA_BLOB *response)
{
NTSTATUS status;
struct auth_ntlmssp_state *a = NULL;
if (strncmp((char *)auth_info->credentials.data, "NTLMSSP", 7) != 0) {
DEBUG(0, ("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;
}
switch (auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_INTEGRITY:
auth_ntlmssp_want_sign(a);
break;
case DCERPC_AUTH_LEVEL_PRIVACY:
auth_ntlmssp_want_seal(a);
break;
default:
break;
}
status = auth_ntlmssp_update(a, auth_info->credentials, 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;
}
/* Make sure data is bound to the memctx, to be freed the caller */
talloc_steal(mem_ctx, response->data);
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;
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:
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, struct ncacn_packet *pkt)
{
struct dcerpc_auth auth_info;
uint16 assoc_gid;
unsigned int auth_type = DCERPC_AUTH_TYPE_NONE;
NTSTATUS status;
struct ndr_syntax_id id;
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;
DATA_BLOB blob = data_blob_null;
int pad_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, 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;
if (rpc_srv_pipe_exists_by_id(&id)) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_srv_get_pipe_cli_name(&id),
rpc_srv_get_pipe_srv_name(&id)));
} else {
status = smb_probe_module(
"rpc", get_pipe_name_from_syntax(
talloc_tos(),
&pkt->u.bind.ctx_list[0].abstract_syntax));
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(),
&pkt->u.bind.ctx_list[0].abstract_syntax)));
return setup_bind_nak(p, pkt);
}
if (rpc_srv_get_pipe_interface_by_cli_name(
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax),
&id)) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\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",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax),
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
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;
}
/*
* 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);
/*
* 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 = 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 = DCERPC_BIND_REASON_ASYNTAX;
bind_ack_ctx.syntax = null_ndr_syntax_id;
}
/*
* 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 +
RPC_HDR_AUTH_LEN +
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);
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;
default:
DEBUG(0, ("Unexpected auth level (%u).\n",
(unsigned int)auth_info.auth_level ));
goto err_exit;
}
switch (auth_type) {
case DCERPC_AUTH_TYPE_NTLMSSP:
if (!pipe_ntlmssp_auth_bind(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
assoc_gid = 0x7a77;
break;
case DCERPC_AUTH_TYPE_SCHANNEL:
if (!pipe_schannel_auth_bind(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_SPNEGO:
if (!pipe_spnego_auth_bind_negotiate(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_NONE:
break;
default:
DEBUG(0, ("Unknown auth type %x requested.\n", auth_type));
goto err_exit;
}
}
if (auth_type == 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 */
}
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 */
status = dcerpc_push_ncacn_packet(pkt, DCERPC_PKT_BIND_ACK,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST,
auth_resp.length,
pkt->call_id,
&u, &blob);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n",
nt_errstr(status)));
}
if (auth_resp.length) {
/* Work out any padding needed before the auth footer. */
pad_len = blob.length % SERVER_NDR_PADDING_SIZE;
if (pad_len) {
pad_len = SERVER_NDR_PADDING_SIZE - pad_len;
DEBUG(10, ("auth pad_len = %u\n",
(unsigned int)pad_len));
}
status = dcerpc_push_dcerpc_auth(pkt,
auth_type,
auth_info.auth_level,
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(&blob, blob.length + pad_len + auth_blob.length);
/* And finally copy all bits in the output pdu */
if (!prs_copy_data_in(&p->out_data.frag,
(char *)blob.data, blob.length)) {
DEBUG(0, ("Failed to copy data to output buffer.\n"));
goto err_exit;
}
if (auth_blob.length) {
if (pad_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!prs_copy_data_in(&p->out_data.frag, pad, pad_len)) {
DEBUG(0, ("api_pipe_bind_req: failed to add "
"%u bytes of pad data.\n",
(unsigned int)pad_len));
goto err_exit;
}
}
if (!prs_copy_data_in(&p->out_data.frag,
(char *)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);
TALLOC_FREE(blob.data);
return True;
err_exit:
prs_mem_free(&p->out_data.frag);
TALLOC_FREE(auth_blob.data);
TALLOC_FREE(blob.data);
return setup_bind_nak(p, pkt);
}
/****************************************************************************
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, struct ncacn_packet *pkt)
{
RPC_HDR hdr;
RPC_HDR_BA hdr_ba;
struct dcerpc_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;
NTSTATUS status;
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;
}
/* 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__));
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)) {
init_rpc_hdr_ba(&hdr_ba,
RPC_MAX_PDU_FRAG_LEN,
RPC_MAX_PDU_FRAG_LEN,
assoc_gid,
ack_pipe_name,
0x1, 0x0, 0x0,
&pkt->u.bind.ctx_list[0].transfer_syntaxes[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 (pkt->auth_length != 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 (pkt->frag_length < RPC_HEADER_LEN +
RPC_HDR_AUTH_LEN +
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);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to unmarshall dcerpc_auth.\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,
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(&hdr, DCERPC_PKT_ALTER_RESP, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST,
pkt->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("", &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, pkt);
}
/****************************************************************************
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, struct ncacn_packet *pkt,
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, struct ncacn_packet *pkt)
{
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,
pkt->u.request.context_id);
if ( pipe_fns ) {
TALLOC_CTX *frame = talloc_stackframe();
ret = api_rpcTNP(p, pkt, pipe_fns->cmds, pipe_fns->n_cmds);
TALLOC_FREE(frame);
}
else {
DEBUG(0, ("No rpc function table associated with context "
"[%d] on pipe [%s]\n",
pkt->u.request.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, struct ncacn_packet *pkt,
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),
pkt->u.request.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, pkt->u.request.opnum, &p->in_data.data);
}
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 = 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, pkt->u.request.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;
}
|