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detect-tls-cert-fingerprint: use *_Register2 API functions

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Use *_Register2 API functions when registering 'tls_cert_fingerprint'
detection keyword.
pull/3304/head
Mats Klepsland 8 years ago committed by Victor Julien
parent 53f63f7498
commit c3a329d6e9
3 changed files with 39 additions and 91 deletions
Show Stats Download Patch File Download Diff File

77
src/detect-engine-tls.c
Unescape Escape View File

@ -352,83 +352,6 @@ int DetectEngineInspectTlsSerial(ThreadVars *tv, DetectEngineCtx *de_ctx,
return cnt;
}
/** \brief TLS fingerprint Mpm prefilter callback
*
* \param det_ctx detection engine thread ctx
* \param p packet to inspect
* \param f flow to inspect
* \param txv tx to inspect
* \param pectx inspection context
*/
static void PrefilterTxTlsFingerprint(DetectEngineThreadCtx *det_ctx,
const void *pectx, Packet *p, Flow *f,
void *txv, const uint64_t idx,
const uint8_t flags)
{
SCEnter();
const MpmCtx *mpm_ctx = (MpmCtx *)pectx;
const SSLState *ssl_state = f->alstate;
if (ssl_state->server_connp.cert0_fingerprint == NULL)
return;
const uint8_t *buffer = (const uint8_t *)ssl_state->server_connp.cert0_fingerprint;
const uint32_t buffer_len = strlen(ssl_state->server_connp.cert0_fingerprint);
if (buffer_len >= mpm_ctx->minlen) {
(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx, &det_ctx->mtcu,
&det_ctx->pmq, buffer, buffer_len);
}
}
int PrefilterTxTlsFingerprintRegister(DetectEngineCtx *de_ctx,
SigGroupHead *sgh, MpmCtx *mpm_ctx)
{
SCEnter();
return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxTlsFingerprint, ALPROTO_TLS,
TLS_STATE_CERT_READY, mpm_ctx, NULL,
"tls_cert_fingerprint");
}
/** \brief Do the content inspection and validation for a signature
*
* \param de_ctx Detection engine context
* \param det_ctx Detection engine thread context
* \param s Signature to inspect
* \param sm SigMatch to inspect
* \param f Flow
* \param flags App layer flags
* \param state App layer state
*
* \retval 0 No match
* \retval 1 Match
*/
int DetectEngineInspectTlsFingerprint(ThreadVars *tv, DetectEngineCtx *de_ctx,
DetectEngineThreadCtx *det_ctx,const Signature *s,
const SigMatchData *smd, Flow *f,
uint8_t flags, void *alstate, void *txv,
uint64_t tx_id)
{
uint8_t *buffer;
uint32_t buffer_len;
int cnt = 0;
SSLState *ssl_state = (SSLState *)alstate;
if (ssl_state->server_connp.cert0_fingerprint == NULL)
return 0;
buffer = (uint8_t *)ssl_state->server_connp.cert0_fingerprint;
buffer_len = strlen(ssl_state->server_connp.cert0_fingerprint);
cnt = DetectEngineContentInspection(de_ctx, det_ctx, s, smd,
f, buffer, buffer_len, 0, DETECT_CI_FLAGS_SINGLE,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
return cnt;
}
int DetectEngineInspectTlsValidity(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
const Signature *s, const SigMatchData *smd,

8
src/detect-engine-tls.h
Unescape Escape View File

@ -31,8 +31,6 @@ int PrefilterTxTlsSubjectRegister(DetectEngineCtx *de_ctx,
SigGroupHead *sgh, MpmCtx *mpm_ctx);
int PrefilterTxTlsSerialRegister(DetectEngineCtx *de_ctx,
SigGroupHead *sgh, MpmCtx *mpm_ctx);
int PrefilterTxTlsFingerprintRegister(DetectEngineCtx *de_ctx,
SigGroupHead *sgh, MpmCtx *mpm_ctx);
int DetectEngineInspectTlsSni(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
@ -56,12 +54,6 @@ int DetectEngineInspectTlsSerial(ThreadVars *tv,
Flow *f, uint8_t flags,
void *alstate, void *txv, uint64_t tx_id);
int DetectEngineInspectTlsFingerprint(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
const Signature *s, const SigMatchData *smd,
Flow *f, uint8_t flags,
void *alstate, void *txv, uint64_t tx_id);
int DetectEngineInspectTlsValidity(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
const Signature *s, const SigMatchData *smd,

45
src/detect-tls-cert-fingerprint.c
Unescape Escape View File

@ -32,7 +32,7 @@
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-tls.h"
#include "detect-engine-prefilter.h"
#include "detect-content.h"
#include "detect-pcre.h"
#include "detect-tls-cert-fingerprint.h"
@ -56,6 +56,10 @@
static int DetectTlsFingerprintSetup(DetectEngineCtx *, Signature *, const char *);
static void DetectTlsFingerprintRegisterTests(void);
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms,
Flow *_f, const uint8_t _flow_flags,
void *txv, const int list_id);
static int g_tls_cert_fingerprint_buffer_id = 0;
/**
@ -73,11 +77,16 @@ void DetectTlsFingerprintRegister(void)
sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].flags |= SIGMATCH_NOOPT;
DetectAppLayerMpmRegister("tls_cert_fingerprint", SIG_FLAG_TOCLIENT, 2,
PrefilterTxTlsFingerprintRegister);
DetectAppLayerInspectEngineRegister2("tls_cert_fingerprint", ALPROTO_TLS,
SIG_FLAG_TOCLIENT, TLS_STATE_CERT_READY,
DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerInspectEngineRegister("tls_cert_fingerprint", ALPROTO_TLS,
SIG_FLAG_TOCLIENT, TLS_STATE_CERT_READY, DetectEngineInspectTlsFingerprint);
DetectAppLayerMpmRegister2("tls_cert_fingerprint", SIG_FLAG_TOCLIENT, 2,
PrefilterGenericMpmRegister, GetData, ALPROTO_TLS,
TLS_STATE_CERT_READY);
DetectBufferTypeSetDescriptionByName("tls_cert_fingerprint",
"TLS certificate fingerprint");
g_tls_cert_fingerprint_buffer_id = DetectBufferTypeGetByName("tls_cert_fingerprint");
}
@ -94,7 +103,7 @@ void DetectTlsFingerprintRegister(void)
static int DetectTlsFingerprintSetup(DetectEngineCtx *de_ctx, Signature *s,
const char *str)
{
s->init_data->list = g_tls_cert_fingerprint_buffer_id;
DetectBufferSetActiveList(s, g_tls_cert_fingerprint_buffer_id);
if (DetectSignatureSetAppProto(s, ALPROTO_TLS) != 0)
return -1;
@ -102,6 +111,30 @@ static int DetectTlsFingerprintSetup(DetectEngineCtx *de_ctx, Signature *s,
return 0;
}
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f,
const uint8_t _flow_flags, void *txv, const int list_id)
{
BUG_ON(det_ctx->inspect_buffers == NULL);
InspectionBuffer *buffer = &det_ctx->inspect_buffers[list_id];
if (buffer->inspect == NULL) {
SSLState *ssl_state = (SSLState *)_f->alstate;
if (ssl_state->server_connp.cert0_fingerprint == NULL) {
return NULL;
}
const uint32_t data_len = strlen(ssl_state->server_connp.cert0_fingerprint);
const uint8_t *data = (uint8_t *)ssl_state->server_connp.cert0_fingerprint;
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
#ifdef UNITTESTS
/**

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