mirror of https://github.com/OISF/suricata
parent
869d5492dc
commit
3d059611c3
@ -0,0 +1,148 @@
|
||||
/* Copyright (C) 2024 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 Victor Julien <vjulien@oisf.net>
|
||||
*
|
||||
* Implements support for tls.alpn keyword.
|
||||
*/
|
||||
|
||||
#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-prefilter.h"
|
||||
#include "detect-engine-content-inspection.h"
|
||||
#include "detect-content.h"
|
||||
#include "detect-tls-alpn.h"
|
||||
#include "detect-engine-uint.h"
|
||||
|
||||
#include "flow.h"
|
||||
#include "flow-util.h"
|
||||
#include "flow-var.h"
|
||||
|
||||
#include "util-debug.h"
|
||||
#include "util-spm.h"
|
||||
#include "util-print.h"
|
||||
|
||||
#include "stream-tcp.h"
|
||||
|
||||
#include "app-layer.h"
|
||||
#include "app-layer-ssl.h"
|
||||
#include "util-profiling.h"
|
||||
|
||||
static int DetectTlsAlpnSetup(DetectEngineCtx *, Signature *, const char *);
|
||||
static InspectionBuffer *TlsAlpnGetData(DetectEngineThreadCtx *det_ctx,
|
||||
const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
|
||||
uint32_t index);
|
||||
|
||||
static int g_tls_alpn_buffer_id = 0;
|
||||
|
||||
/**
|
||||
* \brief Registration function for keyword: tls.alpn
|
||||
*/
|
||||
void DetectTlsAlpnRegister(void)
|
||||
{
|
||||
sigmatch_table[DETECT_TLS_ALPN].name = "tls.alpn";
|
||||
sigmatch_table[DETECT_TLS_ALPN].desc = "sticky buffer to match the TLS ALPN buffer";
|
||||
sigmatch_table[DETECT_TLS_ALPN].url = "/rules/tls-keywords.html#tls-alpn";
|
||||
sigmatch_table[DETECT_TLS_ALPN].Setup = DetectTlsAlpnSetup;
|
||||
sigmatch_table[DETECT_TLS_ALPN].flags |= SIGMATCH_NOOPT;
|
||||
sigmatch_table[DETECT_TLS_ALPN].flags |= SIGMATCH_INFO_STICKY_BUFFER;
|
||||
|
||||
DetectAppLayerMultiRegister("tls.alpn", ALPROTO_TLS, SIG_FLAG_TOSERVER, 0, TlsAlpnGetData, 2,
|
||||
TLS_STATE_IN_PROGRESS);
|
||||
DetectAppLayerMultiRegister(
|
||||
"tls.alpn", ALPROTO_TLS, SIG_FLAG_TOCLIENT, 0, TlsAlpnGetData, 2, TLS_STATE_CERT_READY);
|
||||
|
||||
DetectBufferTypeSetDescriptionByName("tls.alpn", "TLS APLN");
|
||||
|
||||
DetectBufferTypeSupportsMultiInstance("tls.alpn");
|
||||
|
||||
g_tls_alpn_buffer_id = DetectBufferTypeGetByName("tls.alpn");
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief This function setup the tls.alpn sticky buffer keyword
|
||||
*
|
||||
* \param de_ctx Pointer to the Detect Engine Context
|
||||
* \param s Pointer to the Signature to which the keyword belongs
|
||||
* \param str Should hold an empty string always
|
||||
*
|
||||
* \retval 0 On success
|
||||
* \retval -1 On failure
|
||||
*/
|
||||
static int DetectTlsAlpnSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
|
||||
{
|
||||
if (DetectBufferSetActiveList(de_ctx, s, g_tls_alpn_buffer_id) < 0)
|
||||
return -1;
|
||||
|
||||
if (DetectSignatureSetAppProto(s, ALPROTO_TLS) < 0)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static InspectionBuffer *TlsAlpnGetData(DetectEngineThreadCtx *det_ctx,
|
||||
const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
|
||||
uint32_t idx)
|
||||
{
|
||||
SCEnter();
|
||||
InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, idx);
|
||||
if (buffer == NULL || buffer->initialized)
|
||||
return buffer;
|
||||
|
||||
const SSLState *ssl_state = (SSLState *)f->alstate;
|
||||
const SSLStateConnp *connp;
|
||||
|
||||
if (flags & STREAM_TOSERVER) {
|
||||
connp = &ssl_state->client_connp;
|
||||
} else {
|
||||
connp = &ssl_state->server_connp;
|
||||
}
|
||||
|
||||
if (TAILQ_EMPTY(&connp->alpns)) {
|
||||
InspectionBufferSetupMultiEmpty(buffer);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
SSLAlpns *a;
|
||||
if (idx == 0) {
|
||||
a = TAILQ_FIRST(&connp->alpns);
|
||||
} else {
|
||||
// TODO optimize ?
|
||||
a = TAILQ_FIRST(&connp->alpns);
|
||||
for (uint32_t i = 0; i < idx; i++) {
|
||||
a = TAILQ_NEXT(a, next);
|
||||
}
|
||||
}
|
||||
if (a == NULL) {
|
||||
InspectionBufferSetupMultiEmpty(buffer);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
InspectionBufferSetupMulti(buffer, transforms, a->alpn, a->size);
|
||||
buffer->flags = DETECT_CI_FLAGS_SINGLE;
|
||||
|
||||
SCReturnPtr(buffer, "InspectionBuffer");
|
||||
}
|
@ -0,0 +1,29 @@
|
||||
/* Copyright (C) 2024 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 Victor Julien <vjulien@oisf.net>
|
||||
*/
|
||||
|
||||
#ifndef SURICATA_DETECT_TLS_ALPN_H
|
||||
#define SURICATA_DETECT_TLS_ALPN_H
|
||||
|
||||
void DetectTlsAlpnRegister(void);
|
||||
|
||||
#endif /* SURICATA_DETECT_TLS_ALPN_H */
|
Loading…
Reference in New Issue