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wmi-1.3.16 from opsview.com

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Are Casilla
2019-02-16 00:16:52 +01:00
parent 163fdd3d1b
commit 17b3af2911
2146 changed files with 678824 additions and 0 deletions
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Samba/source/libcli/raw/smb_signing.c
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/*
Unix SMB/CIFS implementation.
SMB Signing Code
Copyright (C) Jeremy Allison 2002.
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
Copyright (C) James J Myers <myersjj@samba.org> 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "smb.h"
#include "libcli/raw/libcliraw.h"
#include "lib/crypto/crypto.h"
/***********************************************************
SMB signing - Common code before we set a new signing implementation
************************************************************/
BOOL set_smb_signing_common(struct smb_signing_context *sign_info)
{
if (sign_info->doing_signing) {
DEBUG(5, ("SMB Signing already in progress, so we don't start it again\n"));
return False;
}
if (!sign_info->allow_smb_signing) {
DEBUG(5, ("SMB Signing has been locally disabled\n"));
return False;
}
return True;
}
/***********************************************************
SMB signing - Common code before we set a new signing implementation
************************************************************/
static BOOL smbcli_set_smb_signing_common(struct smbcli_transport *transport)
{
if (!set_smb_signing_common(&transport->negotiate.sign_info)) {
return False;
}
if (!(transport->negotiate.sec_mode &
(NEGOTIATE_SECURITY_SIGNATURES_REQUIRED|NEGOTIATE_SECURITY_SIGNATURES_ENABLED))) {
DEBUG(5, ("SMB Signing is not negotiated by the peer\n"));
return False;
}
/* These calls are INCOMPATIBLE with SMB signing */
transport->negotiate.readbraw_supported = False;
transport->negotiate.writebraw_supported = False;
return True;
}
void mark_packet_signed(struct request_buffer *out)
{
uint16_t flags2;
flags2 = SVAL(out->hdr, HDR_FLG2);
flags2 |= FLAGS2_SMB_SECURITY_SIGNATURES;
SSVAL(out->hdr, HDR_FLG2, flags2);
}
BOOL signing_good(struct smb_signing_context *sign_info,
unsigned int seq, BOOL good)
{
if (good) {
if (!sign_info->doing_signing) {
DEBUG(5, ("Seen valid packet, so turning signing on\n"));
sign_info->doing_signing = True;
}
if (!sign_info->seen_valid) {
DEBUG(5, ("Seen valid packet, so marking signing as 'seen valid'\n"));
sign_info->seen_valid = True;
}
} else {
if (!sign_info->seen_valid) {
/* If we have never seen a good packet, just turn it off */
DEBUG(5, ("signing_good: signing negotiated but not required and peer\n"
"isn't sending correct signatures. Turning off.\n"));
smbcli_set_signing_off(sign_info);
return True;
} else {
/* bad packet after signing started - fail and disconnect. */
DEBUG(0, ("signing_good: BAD SIG: seq %u\n", seq));
return False;
}
}
return True;
}
void sign_outgoing_message(struct request_buffer *out, DATA_BLOB *mac_key, unsigned int seq_num)
{
uint8_t calc_md5_mac[16];
struct MD5Context md5_ctx;
/*
* Firstly put the sequence number into the first 4 bytes.
* and zero out the next 4 bytes.
*/
SIVAL(out->hdr, HDR_SS_FIELD, seq_num);
SIVAL(out->hdr, HDR_SS_FIELD + 4, 0);
/* mark the packet as signed - BEFORE we sign it...*/
mark_packet_signed(out);
/* Calculate the 16 byte MAC and place first 8 bytes into the field. */
MD5Init(&md5_ctx);
MD5Update(&md5_ctx, mac_key->data, mac_key->length);
MD5Update(&md5_ctx,
out->buffer + NBT_HDR_SIZE,
out->size - NBT_HDR_SIZE);
MD5Final(calc_md5_mac, &md5_ctx);
memcpy(&out->hdr[HDR_SS_FIELD], calc_md5_mac, 8);
DEBUG(5, ("sign_outgoing_message: SENT SIG (seq: %d): sent SMB signature of\n",
seq_num));
dump_data(5, calc_md5_mac, 8);
/* req->out.hdr[HDR_SS_FIELD+2]=0;
Uncomment this to test if the remote server actually verifies signitures...*/
}
BOOL check_signed_incoming_message(struct request_buffer *in, DATA_BLOB *mac_key, uint_t seq_num)
{
BOOL good;
uint8_t calc_md5_mac[16];
uint8_t *server_sent_mac;
uint8_t sequence_buf[8];
struct MD5Context md5_ctx;
const size_t offset_end_of_sig = (HDR_SS_FIELD + 8);
int i;
const int sign_range = 0;
/* room enough for the signature? */
if (in->size < NBT_HDR_SIZE + HDR_SS_FIELD + 8) {
return False;
}
if (!mac_key->length) {
/* NO key yet */
return False;
}
/* its quite bogus to be guessing sequence numbers, but very useful
when debugging signing implementations */
for (i = 0-sign_range; i <= 0+sign_range; i++) {
/*
* Firstly put the sequence number into the first 4 bytes.
* and zero out the next 4 bytes.
*/
SIVAL(sequence_buf, 0, seq_num + i);
SIVAL(sequence_buf, 4, 0);
/* get a copy of the server-sent mac */
server_sent_mac = &in->hdr[HDR_SS_FIELD];
/* Calculate the 16 byte MAC and place first 8 bytes into the field. */
MD5Init(&md5_ctx);
MD5Update(&md5_ctx, mac_key->data,
mac_key->length);
MD5Update(&md5_ctx, in->hdr, HDR_SS_FIELD);
MD5Update(&md5_ctx, sequence_buf, sizeof(sequence_buf));
MD5Update(&md5_ctx, in->hdr + offset_end_of_sig,
in->size - NBT_HDR_SIZE - (offset_end_of_sig));
MD5Final(calc_md5_mac, &md5_ctx);
good = (memcmp(server_sent_mac, calc_md5_mac, 8) == 0);
if (i == 0) {
if (!good) {
DEBUG(5, ("check_signed_incoming_message: BAD SIG (seq: %d): wanted SMB signature of\n", seq_num + i));
dump_data(5, calc_md5_mac, 8);
DEBUG(5, ("check_signed_incoming_message: BAD SIG (seq: %d): got SMB signature of\n", seq_num + i));
dump_data(5, server_sent_mac, 8);
} else {
DEBUG(15, ("check_signed_incoming_message: GOOD SIG (seq: %d): got SMB signature of\n", seq_num + i));
dump_data(5, server_sent_mac, 8);
}
}
if (good) break;
}
if (good && i != 0) {
DEBUG(0,("SIGNING OFFSET %d (should be %d)\n", i, seq_num));
}
return good;
}
static void smbcli_req_allocate_seq_num(struct smbcli_request *req)
{
req->seq_num = req->transport->negotiate.sign_info.next_seq_num;
/* some requests (eg. NTcancel) are one way, and the sequence number
should be increased by 1 not 2 */
if (req->sign_single_increment) {
req->transport->negotiate.sign_info.next_seq_num += 1;
} else {
req->transport->negotiate.sign_info.next_seq_num += 2;
}
}
/***********************************************************
SMB signing - Simple implementation - calculate a MAC to send.
************************************************************/
void smbcli_request_calculate_sign_mac(struct smbcli_request *req)
{
#if 0
/* enable this when packet signing is preventing you working out why valgrind
says that data is uninitialised */
file_save("pkt.dat", req->out.buffer, req->out.size);
#endif
switch (req->transport->negotiate.sign_info.signing_state) {
case SMB_SIGNING_ENGINE_OFF:
break;
case SMB_SIGNING_ENGINE_BSRSPYL:
/* mark the packet as signed - BEFORE we sign it...*/
mark_packet_signed(&req->out);
/* I wonder what BSRSPYL stands for - but this is what MS
actually sends! */
memcpy((req->out.hdr + HDR_SS_FIELD), "BSRSPYL ", 8);
break;
case SMB_SIGNING_ENGINE_ON:
smbcli_req_allocate_seq_num(req);
sign_outgoing_message(&req->out,
&req->transport->negotiate.sign_info.mac_key,
req->seq_num);
break;
}
return;
}
/**
SMB signing - NULL implementation
@note Used as an initialisation only - it will not correctly
shut down a real signing mechanism
*/
BOOL smbcli_set_signing_off(struct smb_signing_context *sign_info)
{
DEBUG(5, ("Shutdown SMB signing\n"));
sign_info->doing_signing = False;
sign_info->next_seq_num = 0;
data_blob_free(&sign_info->mac_key);
sign_info->signing_state = SMB_SIGNING_ENGINE_OFF;
return True;
}
/**
SMB signing - TEMP implementation - setup the MAC key.
*/
BOOL smbcli_temp_set_signing(struct smbcli_transport *transport)
{
if (!smbcli_set_smb_signing_common(transport)) {
return False;
}
DEBUG(5, ("BSRSPYL SMB signing enabled\n"));
smbcli_set_signing_off(&transport->negotiate.sign_info);
transport->negotiate.sign_info.mac_key = data_blob(NULL, 0);
transport->negotiate.sign_info.signing_state = SMB_SIGNING_ENGINE_BSRSPYL;
return True;
}
/***********************************************************
SMB signing - Simple implementation - check a MAC sent by server.
************************************************************/
/**
* Check a packet supplied by the server.
* @return False if we had an established signing connection
* which had a back checksum, True otherwise
*/
BOOL smbcli_request_check_sign_mac(struct smbcli_request *req)
{
BOOL good;
switch (req->transport->negotiate.sign_info.signing_state)
{
case SMB_SIGNING_ENGINE_OFF:
return True;
case SMB_SIGNING_ENGINE_BSRSPYL:
case SMB_SIGNING_ENGINE_ON:
{
if (req->in.size < (HDR_SS_FIELD + 8)) {
return False;
} else {
good = check_signed_incoming_message(&req->in,
&req->transport->negotiate.sign_info.mac_key,
req->seq_num+1);
return signing_good(&req->transport->negotiate.sign_info,
req->seq_num+1, good);
}
}
}
return False;
}
/***********************************************************
SMB signing - Simple implementation - setup the MAC key.
************************************************************/
BOOL smbcli_simple_set_signing(TALLOC_CTX *mem_ctx,
struct smb_signing_context *sign_info,
const DATA_BLOB *user_session_key,
const DATA_BLOB *response)
{
if (sign_info->mandatory_signing) {
DEBUG(5, ("Mandatory SMB signing enabled!\n"));
}
DEBUG(5, ("SMB signing enabled!\n"));
if (response && response->length) {
sign_info->mac_key = data_blob_talloc(mem_ctx, NULL, response->length + user_session_key->length);
} else {
sign_info->mac_key = data_blob_talloc(mem_ctx, NULL, user_session_key->length);
}
memcpy(&sign_info->mac_key.data[0], user_session_key->data, user_session_key->length);
if (response && response->length) {
memcpy(&sign_info->mac_key.data[user_session_key->length],response->data, response->length);
}
dump_data_pw("Started Signing with key:\n", sign_info->mac_key.data, sign_info->mac_key.length);
/* Initialise the sequence number */
sign_info->next_seq_num = 0;
sign_info->signing_state = SMB_SIGNING_ENGINE_ON;
return True;
}
/***********************************************************
SMB signing - Simple implementation - setup the MAC key.
************************************************************/
BOOL smbcli_transport_simple_set_signing(struct smbcli_transport *transport,
const DATA_BLOB user_session_key,
const DATA_BLOB response)
{
if (!smbcli_set_smb_signing_common(transport)) {
return False;
}
return smbcli_simple_set_signing(transport,
&transport->negotiate.sign_info,
&user_session_key,
&response);
}
BOOL smbcli_init_signing(struct smbcli_transport *transport)
{
transport->negotiate.sign_info.mac_key = data_blob(NULL, 0);
if (!smbcli_set_signing_off(&transport->negotiate.sign_info)) {
return False;
}
switch (lp_client_signing()) {
case SMB_SIGNING_OFF:
transport->negotiate.sign_info.allow_smb_signing = False;
break;
case SMB_SIGNING_SUPPORTED:
case SMB_SIGNING_AUTO:
transport->negotiate.sign_info.allow_smb_signing = True;
break;
case SMB_SIGNING_REQUIRED:
transport->negotiate.sign_info.allow_smb_signing = True;
transport->negotiate.sign_info.mandatory_signing = True;
break;
}
return True;
}