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/* Copyright (C) 2007-2016 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.
*/
/**
* \ingroup sshlayer
*
* @{
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Implements support ssh_proto sticky buffer
*/
#include "suricata-common.h"
#include "threads.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-state.h"
#include "detect-engine-prefilter.h"
#include "detect-engine-content-inspection.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-ssh.h"
#include "detect-ssh-proto.h"
#include "rust.h"
#define KEYWORD_NAME "ssh.proto"
#define KEYWORD_NAME_LEGACY "ssh_proto"
#define KEYWORD_DOC "ssh-keywords.html#ssh-proto"
#define BUFFER_NAME "ssh.proto"
#define BUFFER_DESC "ssh protocol version field"
static int g_buffer_id = 0;
static InspectionBuffer *GetSshData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f,
const uint8_t flow_flags, void *txv, const int list_id)
{
SCEnter();
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
const uint8_t *protocol = NULL;
uint32_t b_len = 0;
if (rs_ssh_tx_get_protocol(txv, &protocol, &b_len, flow_flags) != 1)
return NULL;
if (protocol == NULL || b_len == 0) {
SCLogDebug("SSH protocol not set");
return NULL;
}
InspectionBufferSetup(det_ctx, list_id, buffer, protocol, b_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static int DetectSshProtocolSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
if (DetectBufferSetActiveList(de_ctx, s, g_buffer_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_SSH) < 0)
return -1;
return 0;
}
void DetectSshProtocolRegister(void)
{
sigmatch_table[DETECT_AL_SSH_PROTOCOL].name = KEYWORD_NAME;
sigmatch_table[DETECT_AL_SSH_PROTOCOL].alias = KEYWORD_NAME_LEGACY;
sigmatch_table[DETECT_AL_SSH_PROTOCOL].desc = BUFFER_NAME " sticky buffer";
sigmatch_table[DETECT_AL_SSH_PROTOCOL].url = "/rules/" KEYWORD_DOC;
sigmatch_table[DETECT_AL_SSH_PROTOCOL].Setup = DetectSshProtocolSetup;
sigmatch_table[DETECT_AL_SSH_PROTOCOL].flags |= SIGMATCH_INFO_STICKY_BUFFER | SIGMATCH_NOOPT;
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2,
PrefilterGenericMpmRegister, GetSshData,
ALPROTO_SSH, SshStateBannerDone),
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2,
PrefilterGenericMpmRegister, GetSshData,
ALPROTO_SSH, SshStateBannerDone),
DetectAppLayerInspectEngineRegister2(BUFFER_NAME,
ALPROTO_SSH, SIG_FLAG_TOSERVER, SshStateBannerDone,
DetectEngineInspectBufferGeneric, GetSshData);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME,
ALPROTO_SSH, SIG_FLAG_TOCLIENT, SshStateBannerDone,
DetectEngineInspectBufferGeneric, GetSshData);
DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
}
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