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app-layer-dcerpc.c
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app-layer-dcerpc.c
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/* Copyright (C) 2007-2010 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Kirby Kuehl <[email protected]>
* \author Anoop Saldanha <[email protected]>
*
* \file DCE/RPC parser and decoder
*
* \todo Remove all the unnecessary per byte incremental loops with a full one
* time jump, i.e.
*
* input[0], input_len
* for (i = 0; i < x; i++)
* input++;
*
* with
*
* input += x;
*
* You'll be surprised at how many such cases we have here. We also need
* to do the same for htp parser. Should speed up the engine drastically.
*/
#include "suricata-common.h"
#include "suricata.h"
#include "debug.h"
#include "decode.h"
#include "threads.h"
#include "util-print.h"
#include "util-pool.h"
#include "util-debug.h"
#include "flow-util.h"
#include "detect-engine-state.h"
#include "stream-tcp-private.h"
#include "stream-tcp-reassemble.h"
#include "stream-tcp.h"
#include "stream.h"
#include "app-layer-protos.h"
#include "app-layer-parser.h"
#include "app-layer.h"
#include "util-spm.h"
#include "util-unittest.h"
#include "app-layer-dcerpc.h"
enum {
DCERPC_FIELD_NONE = 0,
DCERPC_PARSE_DCERPC_HEADER,
DCERPC_PARSE_DCERPC_BIND,
DCERPC_PARSE_DCERPC_BIND_ACK,
DCERPC_PARSE_DCERPC_REQUEST,
/* must be last */
DCERPC_FIELD_MAX,
};
void DCERPCUuidListFree(DCERPCUuidEntryList *list);
/* \brief hexdump function from libdnet, used for debugging only */
void hexdump(/*Flow *f,*/ const void *buf, size_t len)
{
/* dumps len bytes of *buf to stdout. Looks like:
* [0000] 75 6E 6B 6E 6F 77 6E 20
* 30 FF 00 00 00 00 39 00 unknown 0.....9.
* (in a single line of course)
*/
const unsigned char *p = buf;
unsigned char c;
size_t n;
char bytestr[4] = {0};
char addrstr[10] = {0};
char hexstr[ 16*3 + 5] = {0};
char charstr[16*1 + 5] = {0};
for (n=1; n<=len; n++) {
if (n%16 == 1) {
/* store address for this line */
#if __WORDSIZE == 64
snprintf(addrstr, sizeof(addrstr), "%.4"PRIx64,
((uint64_t)p-(uint64_t)buf) );
#else
snprintf(addrstr, sizeof(addrstr), "%.4"PRIx32,
((uint32_t)p-(uint32_t)buf) );
#endif
}
c = *p;
if (isalnum(c) == 0) {
c = '.';
}
/* store hex str (for left side) */
snprintf(bytestr, sizeof(bytestr), "%02X ", *p);
strlcat(hexstr, bytestr, sizeof(hexstr)-strlen(hexstr)-1);
/* store char str (for right side) */
snprintf(bytestr, sizeof(bytestr), "%c", c);
strlcat(charstr, bytestr, sizeof(charstr)-strlen(charstr)-1);
if(n%16 == 0) {
/* line completed */
printf("[%4.4s] %-50.50s %s\n", addrstr, hexstr, charstr);
hexstr[0] = 0;
charstr[0] = 0;
} else if(n%8 == 0) {
/* half line: add whitespaces */
strlcat(hexstr, " ", sizeof(hexstr)-strlen(hexstr)-1);
strlcat(charstr, " ", sizeof(charstr)-strlen(charstr)-1);
}
p++; /* next byte */
}
if (strlen(hexstr) > 0) {
/* print rest of buffer if not empty */
printf("[%4.4s] %-50.50s %s\n", addrstr, hexstr, charstr);
}
}
/**
* \brief printUUID function used to print UUID, Major and Minor Version Number
* and if it was Accepted or Rejected in the BIND_ACK.
*/
void printUUID(char *type, DCERPCUuidEntry *uuid)
{
uint8_t i = 0;
if (uuid == NULL) {
return;
}
printf("%s UUID [%2u] %s ", type, uuid->ctxid,
(uuid->result == 0) ? "Accepted" : "Rejected");
for (i = 0; i < 16; i++) {
printf("%02x", uuid->uuid[i]);
}
printf(" Major Version 0x%04x Minor Version 0x%04x\n", uuid->version,
uuid->versionminor);
}
/**
* \brief DCERPCParseSecondaryAddr reads secondaryaddrlen bytes from the BIND_ACK
* DCERPC call.
*/
static uint32_t DCERPCParseSecondaryAddr(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
while (dcerpc->dcerpcbindbindack.secondaryaddrlenleft-- && input_len--) {
SCLogDebug("0x%02x ", *p);
p++;
}
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
static uint32_t PaddingParser(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
while (dcerpc->padleft-- && input_len--) {
SCLogDebug("0x%02x ", *p);
p++;
}
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
static uint32_t DCERPCGetCTXItems(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
if (input_len) {
switch (dcerpc->dcerpcbindbindack.ctxbytesprocessed) {
case 0:
if (input_len >= 4) {
dcerpc->dcerpcbindbindack.numctxitems = *p;
dcerpc->dcerpcbindbindack.numctxitemsleft = dcerpc->dcerpcbindbindack.numctxitems;
dcerpc->dcerpcbindbindack.ctxbytesprocessed += 4;
dcerpc->bytesprocessed += 4;
SCReturnUInt(4U);
} else {
dcerpc->dcerpcbindbindack.numctxitems = *(p++);
dcerpc->dcerpcbindbindack.numctxitemsleft = dcerpc->dcerpcbindbindack.numctxitems;
if (!(--input_len))
break;
}
/* fall through */
case 1:
p++;
if (!(--input_len))
break;
/* fall through */
case 2:
p++;
if (!(--input_len))
break;
/* fall through */
case 3:
p++;
input_len--;
break;
}
}
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (p - input);
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
/**
* \brief DCERPCParseBINDCTXItem is called for each CTXItem found the DCERPC BIND call.
* each UUID is added to a TAILQ.
*/
static uint32_t DCERPCParseBINDCTXItem(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
if (input_len) {
switch (dcerpc->dcerpcbindbindack.ctxbytesprocessed) {
case 0:
if (input_len >= 44) {
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.ctxid = *(p);
dcerpc->dcerpcbindbindack.ctxid |= *(p + 1) << 8;
dcerpc->dcerpcbindbindack.uuid[3] = *(p + 4);
dcerpc->dcerpcbindbindack.uuid[2] = *(p + 5);
dcerpc->dcerpcbindbindack.uuid[1] = *(p + 6);
dcerpc->dcerpcbindbindack.uuid[0] = *(p + 7);
dcerpc->dcerpcbindbindack.uuid[5] = *(p + 8);
dcerpc->dcerpcbindbindack.uuid[4] = *(p + 9);
dcerpc->dcerpcbindbindack.uuid[7] = *(p + 10);
dcerpc->dcerpcbindbindack.uuid[6] = *(p + 11);
dcerpc->dcerpcbindbindack.uuid[8] = *(p + 12);
dcerpc->dcerpcbindbindack.uuid[9] = *(p + 13);
dcerpc->dcerpcbindbindack.uuid[10] = *(p + 14);
dcerpc->dcerpcbindbindack.uuid[11] = *(p + 15);
dcerpc->dcerpcbindbindack.uuid[12] = *(p + 16);
dcerpc->dcerpcbindbindack.uuid[13] = *(p + 17);
dcerpc->dcerpcbindbindack.uuid[14] = *(p + 18);
dcerpc->dcerpcbindbindack.uuid[15] = *(p + 19);
dcerpc->dcerpcbindbindack.version = *(p + 20);
dcerpc->dcerpcbindbindack.version |= *(p + 21) << 8;
dcerpc->dcerpcbindbindack.versionminor = *(p + 22);
dcerpc->dcerpcbindbindack.versionminor |= *(p + 23) << 8;
} else { /* Big Endian */
dcerpc->dcerpcbindbindack.ctxid = *(p) << 8;
dcerpc->dcerpcbindbindack.ctxid |= *(p + 1);
dcerpc->dcerpcbindbindack.uuid[0] = *(p + 4);
dcerpc->dcerpcbindbindack.uuid[1] = *(p + 5);
dcerpc->dcerpcbindbindack.uuid[2] = *(p + 6);
dcerpc->dcerpcbindbindack.uuid[3] = *(p + 7);
dcerpc->dcerpcbindbindack.uuid[4] = *(p + 8);
dcerpc->dcerpcbindbindack.uuid[5] = *(p + 9);
dcerpc->dcerpcbindbindack.uuid[6] = *(p + 10);
dcerpc->dcerpcbindbindack.uuid[7] = *(p + 11);
dcerpc->dcerpcbindbindack.uuid[8] = *(p + 12);
dcerpc->dcerpcbindbindack.uuid[9] = *(p + 13);
dcerpc->dcerpcbindbindack.uuid[10] = *(p + 14);
dcerpc->dcerpcbindbindack.uuid[11] = *(p + 15);
dcerpc->dcerpcbindbindack.uuid[12] = *(p + 16);
dcerpc->dcerpcbindbindack.uuid[13] = *(p + 17);
dcerpc->dcerpcbindbindack.uuid[14] = *(p + 18);
dcerpc->dcerpcbindbindack.uuid[15] = *(p + 19);
dcerpc->dcerpcbindbindack.version = *(p + 20) << 8;
dcerpc->dcerpcbindbindack.version |= *(p + 21);
dcerpc->dcerpcbindbindack.versionminor = *(p + 22) << 8;
dcerpc->dcerpcbindbindack.versionminor |= *(p + 23);
}
//if (dcerpc->dcerpcbindbindack.ctxid == dcerpc->dcerpcbindbindack.numctxitems
// - dcerpc->dcerpcbindbindack.numctxitemsleft) {
dcerpc->dcerpcbindbindack.uuid_entry = (DCERPCUuidEntry *)SCCalloc(1, sizeof(DCERPCUuidEntry));
if (dcerpc->dcerpcbindbindack.uuid_entry == NULL) {
SCLogDebug("UUID Entry is NULL");
SCReturnUInt(0);
}
dcerpc->dcerpcbindbindack.uuid_entry->internal_id = dcerpc->dcerpcbindbindack.uuid_internal_id++;
memcpy(dcerpc->dcerpcbindbindack.uuid_entry->uuid,
dcerpc->dcerpcbindbindack.uuid,
sizeof(dcerpc->dcerpcbindbindack.uuid));
dcerpc->dcerpcbindbindack.uuid_entry->ctxid = dcerpc->dcerpcbindbindack.ctxid;
dcerpc->dcerpcbindbindack.uuid_entry->version = dcerpc->dcerpcbindbindack.version;
dcerpc->dcerpcbindbindack.uuid_entry->versionminor = dcerpc->dcerpcbindbindack.versionminor;
/* store the first frag flag in the uuid as pfc_flags will
* be overwritten by new packets. */
if (dcerpc->dcerpchdr.pfc_flags & PFC_FIRST_FRAG) {
dcerpc->dcerpcbindbindack.uuid_entry->flags |= DCERPC_UUID_ENTRY_FLAG_FF;
}
TAILQ_INSERT_HEAD(&dcerpc->dcerpcbindbindack.uuid_list,
dcerpc->dcerpcbindbindack.uuid_entry,
next);
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
printUUID("BIND", dcerpc->dcerpcbindbindack.uuid_entry);
}
#endif
dcerpc->dcerpcbindbindack.numctxitemsleft--;
dcerpc->bytesprocessed += (44);
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (44);
SCReturnUInt(44U);
//} else {
// SCLogDebug("ctxitem %u, expected %u\n", dcerpc->dcerpcbindbindack.ctxid,
// dcerpc->dcerpcbindbindack.numctxitems - dcerpc->dcerpcbindbindack.numctxitemsleft);
// SCReturnUInt(0);
//}
} else {
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.ctxid = *(p++);
} else {
dcerpc->dcerpcbindbindack.ctxid = *(p++) << 8;
}
if (!(--input_len))
break;
}
/* fall through */
case 1:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.ctxid |= *(p++) << 8;
} else {
dcerpc->dcerpcbindbindack.ctxid |= *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 2:
/* num transact items */
p++;
if (!(--input_len))
break;
/* fall through */
case 3:
/* reserved */
p++;
if (!(--input_len))
break;
/* fall through */
case 4:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[3] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[0] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 5:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[2] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[1] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 6:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[1] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[2] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 7:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[0] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[3] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 8:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[5] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[4] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 9:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[4] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[5] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 10:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[7] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[6] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 11:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.uuid[6] = *(p++);
} else {
dcerpc->dcerpcbindbindack.uuid[7] = *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 12:
/* The following bytes are in the same order for both big and little endian */
dcerpc->dcerpcbindbindack.uuid[8] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 13:
dcerpc->dcerpcbindbindack.uuid[9] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 14:
dcerpc->dcerpcbindbindack.uuid[10] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 15:
dcerpc->dcerpcbindbindack.uuid[11] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 16:
dcerpc->dcerpcbindbindack.uuid[12] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 17:
dcerpc->dcerpcbindbindack.uuid[13] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 18:
dcerpc->dcerpcbindbindack.uuid[14] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 19:
dcerpc->dcerpcbindbindack.uuid[15] = *(p++);
if (!(--input_len))
break;
/* fall through */
case 20:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.version = *(p++);
} else {
dcerpc->dcerpcbindbindack.version = *(p++) << 8;
}
if (!(--input_len))
break;
/* fall through */
case 21:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.version |= *(p++) << 8;
} else {
dcerpc->dcerpcbindbindack.version |= *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 22:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.versionminor = *(p++);
} else {
dcerpc->dcerpcbindbindack.versionminor = *(p++) << 8;
}
if (!(--input_len))
break;
/* fall through */
case 23:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.versionminor |= *(p++) << 8;
} else {
dcerpc->dcerpcbindbindack.versionminor |= *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 24:
p++;
if (!(--input_len))
break;
/* fall through */
case 25:
p++;
if (!(--input_len))
break;
/* fall through */
case 26:
p++;
if (!(--input_len))
break;
/* fall through */
case 27:
p++;
if (!(--input_len))
break;
/* fall through */
case 28:
p++;
if (!(--input_len))
break;
/* fall through */
case 29:
p++;
if (!(--input_len))
break;
/* fall through */
case 30:
p++;
if (!(--input_len))
break;
/* fall through */
case 31:
p++;
if (!(--input_len))
break;
/* fall through */
case 32:
p++;
if (!(--input_len))
break;
/* fall through */
case 33:
p++;
if (!(--input_len))
break;
/* fall through */
case 34:
p++;
if (!(--input_len))
break;
/* fall through */
case 35:
p++;
if (!(--input_len))
break;
/* fall through */
case 36:
p++;
if (!(--input_len))
break;
/* fall through */
case 37:
p++;
if (!(--input_len))
break;
/* fall through */
case 38:
p++;
if (!(--input_len))
break;
/* fall through */
case 39:
p++;
if (!(--input_len))
break;
/* fall through */
case 40:
p++;
if (!(--input_len))
break;
/* fall through */
case 41:
p++;
if (!(--input_len))
break;
/* fall through */
case 42:
p++;
if (!(--input_len))
break;
/* fall through */
case 43:
p++;
--input_len;
//if (dcerpc->dcerpcbindbindack.ctxid == dcerpc->dcerpcbindbindack.numctxitems - dcerpc->dcerpcbindbindack.numctxitemsleft) {
dcerpc->dcerpcbindbindack.uuid_entry = (DCERPCUuidEntry *)
SCCalloc(1, sizeof(DCERPCUuidEntry));
if (dcerpc->dcerpcbindbindack.uuid_entry == NULL) {
SCLogDebug("UUID Entry is NULL\n");
SCReturnUInt(0);
}
dcerpc->dcerpcbindbindack.uuid_entry->internal_id =
dcerpc->dcerpcbindbindack.uuid_internal_id++;
memcpy(dcerpc->dcerpcbindbindack.uuid_entry->uuid,
dcerpc->dcerpcbindbindack.uuid,
sizeof(dcerpc->dcerpcbindbindack.uuid));
dcerpc->dcerpcbindbindack.uuid_entry->ctxid = dcerpc->dcerpcbindbindack.ctxid;
dcerpc->dcerpcbindbindack.uuid_entry->version = dcerpc->dcerpcbindbindack.version;
dcerpc->dcerpcbindbindack.uuid_entry->versionminor = dcerpc->dcerpcbindbindack.versionminor;
/* store the first frag flag in the uuid as pfc_flags will
* be overwritten by new packets. */
if (dcerpc->dcerpchdr.pfc_flags & PFC_FIRST_FRAG) {
dcerpc->dcerpcbindbindack.uuid_entry->flags |= DCERPC_UUID_ENTRY_FLAG_FF;
}
TAILQ_INSERT_HEAD(&dcerpc->dcerpcbindbindack.uuid_list,
dcerpc->dcerpcbindbindack.uuid_entry,
next);
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
printUUID("BINDACK", dcerpc->dcerpcbindbindack.uuid_entry);
}
#endif
dcerpc->dcerpcbindbindack.numctxitemsleft--;
dcerpc->bytesprocessed += (p - input);
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
//} else {
// SCLogDebug("ctxitem %u, expected %u\n", dcerpc->dcerpcbindbindack.ctxid,
// dcerpc->dcerpcbindbindack.numctxitems - dcerpc->dcerpcbindbindack.numctxitemsleft);
// SCReturnUInt(0);
//}
break;
}
}
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (p - input);
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
/**
* \brief DCERPCParseBINDACKCTXItem is called for each CTXItem found in
* the BIND_ACK call. The result (Accepted or Rejected) is added to the
* correct UUID from the BIND call.
*/
static uint32_t DCERPCParseBINDACKCTXItem(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
DCERPCUuidEntry *uuid_entry;
if (input_len) {
switch (dcerpc->dcerpcbindbindack.ctxbytesprocessed) {
case 0:
if (input_len >= 24) {
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.result = *p;
dcerpc->dcerpcbindbindack.result |= *(p + 1) << 8;
} else {
dcerpc->dcerpcbindbindack.result = *p << 8;
dcerpc->dcerpcbindbindack.result |= *(p + 1);
}
TAILQ_FOREACH(uuid_entry, &dcerpc->dcerpcbindbindack.uuid_list, next) {
if (uuid_entry->internal_id == dcerpc->dcerpcbindbindack.uuid_internal_id) {
uuid_entry->result = dcerpc->dcerpcbindbindack.result;
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
printUUID("BIND_ACK", uuid_entry);
}
#endif
if (uuid_entry->result != 0)
break;
dcerpc->dcerpcbindbindack.uuid_entry = (DCERPCUuidEntry *)
SCCalloc(1, sizeof(DCERPCUuidEntry));
if (dcerpc->dcerpcbindbindack.uuid_entry != NULL) {
memcpy(dcerpc->dcerpcbindbindack.uuid_entry,
uuid_entry,
sizeof(DCERPCUuidEntry));
TAILQ_INSERT_HEAD(&dcerpc->dcerpcbindbindack.accepted_uuid_list,
dcerpc->dcerpcbindbindack.uuid_entry,
next);
}
break;
}
}
dcerpc->dcerpcbindbindack.uuid_internal_id++;
dcerpc->dcerpcbindbindack.numctxitemsleft--;
dcerpc->bytesprocessed += (24);
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (24);
SCReturnUInt(24U);
} else {
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.result = *(p++);
} else {
dcerpc->dcerpcbindbindack.result = *(p++) << 8;
}
if (!(--input_len))
break;
}
/* fall through */
case 1:
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.result |= *(p++) << 8;
} else {
dcerpc->dcerpcbindbindack.result |= *(p++);
}
if (!(--input_len))
break;
/* fall through */
case 2:
/* num transact items */
p++;
if (!(--input_len))
break;
/* fall through */
case 3:
/* reserved */
p++;
if (!(--input_len))
break;
/* fall through */
case 4:
p++;
if (!(--input_len))
break;
/* fall through */
case 5:
p++;
if (!(--input_len))
break;
/* fall through */
case 6:
p++;
if (!(--input_len))
break;
/* fall through */
case 7:
p++;
if (!(--input_len))
break;
/* fall through */
case 8:
p++;
if (!(--input_len))
break;
/* fall through */
case 9:
p++;
if (!(--input_len))
break;
/* fall through */
case 10:
p++;
if (!(--input_len))
break;
/* fall through */
case 11:
p++;
if (!(--input_len))
break;
/* fall through */
case 12:
p++;
if (!(--input_len))
break;
/* fall through */
case 13:
p++;
if (!(--input_len))
break;
/* fall through */
case 14:
p++;
if (!(--input_len))
break;
/* fall through */
case 15:
p++;
if (!(--input_len))
break;
/* fall through */
case 16:
p++;
if (!(--input_len))
break;
/* fall through */
case 17:
p++;
if (!(--input_len))
break;
/* fall through */
case 18:
p++;
if (!(--input_len))
break;
/* fall through */
case 19:
p++;
if (!(--input_len))
break;
/* fall through */
case 20:
p++;
if (!(--input_len))
break;
/* fall through */
case 21:
p++;
if (!(--input_len))
break;
/* fall through */
case 22:
p++;
if (!(--input_len))
break;
/* fall through */
case 23:
TAILQ_FOREACH(uuid_entry, &dcerpc->dcerpcbindbindack.uuid_list, next) {
if (uuid_entry->internal_id == dcerpc->dcerpcbindbindack.uuid_internal_id) {
uuid_entry->result = dcerpc->dcerpcbindbindack.result;
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
printUUID("BIND_ACK", uuid_entry);
}
#endif
if (uuid_entry->result != 0)
break;
dcerpc->dcerpcbindbindack.uuid_entry = (DCERPCUuidEntry *)
SCCalloc(1, sizeof(DCERPCUuidEntry));
if (dcerpc->dcerpcbindbindack.uuid_entry != NULL) {
memcpy(dcerpc->dcerpcbindbindack.uuid_entry,
uuid_entry,
sizeof(DCERPCUuidEntry));
TAILQ_INSERT_HEAD(&dcerpc->dcerpcbindbindack.accepted_uuid_list,
dcerpc->dcerpcbindbindack.uuid_entry,
next);
}
break;
}
}
dcerpc->dcerpcbindbindack.uuid_internal_id++;
dcerpc->dcerpcbindbindack.numctxitemsleft--;
p++;
--input_len;
break;
}
}
dcerpc->dcerpcbindbindack.ctxbytesprocessed += (p - input);
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
static uint32_t DCERPCParseBIND(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
if (input_len) {
switch (dcerpc->bytesprocessed) {
case 16:
dcerpc->dcerpcbindbindack.numctxitems = 0;
if (input_len >= 12) {
DCERPCUuidListFree(&dcerpc->dcerpcbindbindack.uuid_list);
if (dcerpc->dcerpchdr.type == BIND) {
DCERPCUuidListFree(&dcerpc->dcerpcbindbindack.accepted_uuid_list);
}
dcerpc->dcerpcbindbindack.uuid_internal_id = 0;
dcerpc->dcerpcbindbindack.numctxitems = *(p + 8);
dcerpc->dcerpcbindbindack.numctxitemsleft = dcerpc->dcerpcbindbindack.numctxitems;
dcerpc->bytesprocessed += 12;
SCReturnUInt(12U);
} else {
/* max_xmit_frag */
p++;
if (!(--input_len))
break;
}
/* fall through */
case 17:
/* max_xmit_frag */
p++;
if (!(--input_len))
break;
/* fall through */
case 18:
/* max_recv_frag */
p++;
if (!(--input_len))
break;
/* fall through */
case 19:
/* max_recv_frag */
p++;
if (!(--input_len))
break;
/* fall through */
case 20:
/* assoc_group_id */
p++;
if (!(--input_len))
break;
/* fall through */
case 21:
/* assoc_group_id */
p++;
if (!(--input_len))
break;
/* fall through */
case 22:
/* assoc_group_id */
p++;
if (!(--input_len))
break;
/* fall through */
case 23:
/* assoc_group_id */
p++;
if (!(--input_len))
break;
/* fall through */
case 24:
DCERPCUuidListFree(&dcerpc->dcerpcbindbindack.uuid_list);
if (dcerpc->dcerpchdr.type == BIND) {
DCERPCUuidListFree(&dcerpc->dcerpcbindbindack.accepted_uuid_list);
}
dcerpc->dcerpcbindbindack.uuid_internal_id = 0;
dcerpc->dcerpcbindbindack.numctxitems = *(p++);
dcerpc->dcerpcbindbindack.numctxitemsleft = dcerpc->dcerpcbindbindack.numctxitems;
if (!(--input_len))
break;
/* fall through */
case 25:
/* pad byte 1 */
p++;
if (!(--input_len))
break;
/* fall through */
case 26:
/* pad byte 2 */
p++;
if (!(--input_len))
break;
/* fall through */
case 27:
/* pad byte 3 */
p++;
--input_len;
break;
/* fall through */
default:
dcerpc->bytesprocessed++;
SCReturnUInt(1);
break;
}
}
dcerpc->bytesprocessed += (p - input);
SCReturnUInt((uint32_t)(p - input));
}
static uint32_t DCERPCParseBINDACK(DCERPC *dcerpc, uint8_t *input, uint32_t input_len)
{
SCEnter();
uint8_t *p = input;
switch (dcerpc->bytesprocessed) {
case 16:
dcerpc->dcerpcbindbindack.uuid_internal_id = 0;
dcerpc->dcerpcbindbindack.numctxitems = 0;
if (input_len >= 10) {
if (dcerpc->dcerpchdr.packed_drep[0] & 0x10) {
dcerpc->dcerpcbindbindack.secondaryaddrlen = *(p + 8);
dcerpc->dcerpcbindbindack.secondaryaddrlen |= *(p + 9) << 8;
} else {
dcerpc->dcerpcbindbindack.secondaryaddrlen = *(p + 8) << 8;
dcerpc->dcerpcbindbindack.secondaryaddrlen |= *(p + 9);
}
dcerpc->dcerpcbindbindack.secondaryaddrlenleft = dcerpc->dcerpcbindbindack.secondaryaddrlen;