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126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/* Copyright (C) 2024 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <vjulien@oisf.net>
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*
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* Implements support for tls.alpn keyword.
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*/
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#include "suricata-common.h"
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#include "threads.h"
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#include "decode.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-buffer.h"
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#include "detect-engine-mpm.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-content.h"
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#include "detect-tls-alpn.h"
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#include "detect-engine-uint.h"
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#include "flow.h"
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#include "flow-util.h"
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#include "flow-var.h"
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#include "util-debug.h"
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#include "util-spm.h"
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#include "util-print.h"
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#include "stream-tcp.h"
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#include "app-layer.h"
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#include "app-layer-ssl.h"
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#include "util-profiling.h"
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static int DetectTlsAlpnSetup(DetectEngineCtx *, Signature *, const char *);
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static int g_tls_alpn_buffer_id = 0;
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static bool TlsAlpnGetData(DetectEngineThreadCtx *det_ctx, const void *txv, const uint8_t flags,
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uint32_t idx, const uint8_t **buf, uint32_t *buf_len)
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{
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SCEnter();
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const SSLState *ssl_state = (SSLState *)txv;
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const SSLStateConnp *connp;
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CStringData d;
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if (flags & STREAM_TOSERVER) {
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connp = &ssl_state->client_connp;
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} else {
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connp = &ssl_state->server_connp;
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}
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if (SCTLSHandshakeGetALPN(connp->hs, idx, &d)) {
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*buf = d.data;
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*buf_len = (uint32_t)d.len;
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return true;
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} else {
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return false;
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}
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}
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/**
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* \brief Registration function for keyword: tls.alpn
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*/
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void DetectTlsAlpnRegister(void)
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{
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sigmatch_table[DETECT_TLS_ALPN].name = "tls.alpn";
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sigmatch_table[DETECT_TLS_ALPN].desc = "sticky buffer to match the TLS ALPN buffer";
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sigmatch_table[DETECT_TLS_ALPN].url = "/rules/tls-keywords.html#tls-alpn";
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sigmatch_table[DETECT_TLS_ALPN].Setup = DetectTlsAlpnSetup;
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sigmatch_table[DETECT_TLS_ALPN].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_TLS_ALPN].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerMultiRegister("tls.alpn", ALPROTO_TLS, SIG_FLAG_TOSERVER,
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TLS_STATE_CLIENT_HELLO_DONE, TlsAlpnGetData, 2);
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DetectAppLayerMultiRegister(
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"tls.alpn", ALPROTO_TLS, SIG_FLAG_TOCLIENT, TLS_STATE_SERVER_HELLO, TlsAlpnGetData, 2);
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DetectBufferTypeSetDescriptionByName("tls.alpn", "TLS APLN");
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DetectBufferTypeSupportsMultiInstance("tls.alpn");
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g_tls_alpn_buffer_id = DetectBufferTypeGetByName("tls.alpn");
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}
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/**
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* \brief This function setup the tls.alpn sticky buffer keyword
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*
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* \param de_ctx Pointer to the Detect Engine Context
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* \param s Pointer to the Signature to which the keyword belongs
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* \param str Should hold an empty string always
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*
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* \retval 0 On success
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* \retval -1 On failure
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*/
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static int DetectTlsAlpnSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (SCDetectBufferSetActiveList(de_ctx, s, g_tls_alpn_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_TLS) < 0)
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return -1;
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return 0;
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}
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