/* Copyright (C) 2017 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 Mats Klepsland * * Implements support for tls_cert_fingerprint keyword. */ #include "suricata-common.h" #include "threads.h" #include "debug.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-content.h" #include "detect-pcre.h" #include "detect-tls-cert-fingerprint.h" #include "flow.h" #include "flow-util.h" #include "flow-var.h" #include "util-debug.h" #include "util-unittest.h" #include "util-spm.h" #include "util-print.h" #include "stream-tcp.h" #include "app-layer.h" #include "app-layer-ssl.h" #include "util-unittest.h" #include "util-unittest-helper.h" 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 void DetectTlsFingerprintSetupCallback(const DetectEngineCtx *de_ctx, Signature *s); static _Bool DetectTlsFingerprintValidateCallback(const Signature *s, const char **sigerror); static int g_tls_cert_fingerprint_buffer_id = 0; /** * \brief Registration function for keyword: tls_cert_fingerprint */ void DetectTlsFingerprintRegister(void) { sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].name = "tls_cert_fingerprint"; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].desc = "content modifier to match the TLS cert fingerprint buffer"; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].url = DOC_URL DOC_VERSION "/rules/tls-keywords.html#tls-cert-fingerprint"; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].Match = NULL; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].Setup = DetectTlsFingerprintSetup; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].Free = NULL; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].RegisterTests = DetectTlsFingerprintRegisterTests; sigmatch_table[DETECT_AL_TLS_CERT_FINGERPRINT].flags |= SIGMATCH_NOOPT; DetectAppLayerInspectEngineRegister2("tls_cert_fingerprint", ALPROTO_TLS, SIG_FLAG_TOCLIENT, TLS_STATE_CERT_READY, DetectEngineInspectBufferGeneric, GetData); DetectAppLayerMpmRegister2("tls_cert_fingerprint", SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister, GetData, ALPROTO_TLS, TLS_STATE_CERT_READY); DetectBufferTypeSetDescriptionByName("tls_cert_fingerprint", "TLS certificate fingerprint"); DetectBufferTypeRegisterSetupCallback("tls_cert_fingerprint", DetectTlsFingerprintSetupCallback); DetectBufferTypeRegisterValidateCallback("tls_cert_fingerprint", DetectTlsFingerprintValidateCallback); g_tls_cert_fingerprint_buffer_id = DetectBufferTypeGetByName("tls_cert_fingerprint"); } /** * \brief this function setup the tls_cert_fingerprint modifier keyword used in the rule * * \param de_ctx Pointer to the Detection Engine Context * \param s Pointer to the Signature to which the current keyword belongs * \param str Should hold an empty string always * * \retval 0 On success */ static int DetectTlsFingerprintSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str) { DetectBufferSetActiveList(s, g_tls_cert_fingerprint_buffer_id); if (DetectSignatureSetAppProto(s, ALPROTO_TLS) != 0) return -1; 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; } static _Bool DetectTlsFingerprintValidateCallback(const Signature *s, const char **sigerror) { const SigMatch *sm = s->init_data->smlists[g_tls_cert_fingerprint_buffer_id]; for ( ; sm != NULL; sm = sm->next) { if (sm->type != DETECT_CONTENT) continue; DetectContentData *cd = (DetectContentData *)sm->ctx; if (cd->content_len != 59) { *sigerror = "Invalid length of the specified fingerprint. " "This rule will therefore never match."; SCLogWarning(SC_WARN_POOR_RULE, "rule %u: %s", s->id, *sigerror); return FALSE; } _Bool have_delimiters = FALSE; uint32_t u; for (u = 0; u < cd->content_len; u++) { if (cd->content[u] == ':') { have_delimiters = TRUE; break; } } if (have_delimiters == FALSE) { *sigerror = "No colon delimiters ':' detected in content after " "tls_cert_fingerprint. This rule will therefore " "never match."; SCLogWarning(SC_WARN_POOR_RULE, "rule %u: %s", s->id, *sigerror); return FALSE; } } return TRUE; } static void DetectTlsFingerprintSetupCallback(const DetectEngineCtx *de_ctx, Signature *s) { SigMatch *sm = s->init_data->smlists[g_tls_cert_fingerprint_buffer_id]; for ( ; sm != NULL; sm = sm->next) { if (sm->type != DETECT_CONTENT) continue; DetectContentData *cd = (DetectContentData *)sm->ctx; _Bool changed = FALSE; uint32_t u; for (u = 0; u < cd->content_len; u++) { if (isupper(cd->content[u])) { cd->content[u] = tolower(cd->content[u]); changed = TRUE; } } /* recreate the context if changes were made */ if (changed) { SpmDestroyCtx(cd->spm_ctx); cd->spm_ctx = SpmInitCtx(cd->content, cd->content_len, 1, de_ctx->spm_global_thread_ctx); } } } #ifdef UNITTESTS /** * \test Test that a signature containing tls_cert_fingerprint is correctly parsed * and that the keyword is registered. */ static int DetectTlsFingerprintTest01(void) { DetectEngineCtx *de_ctx = NULL; SigMatch *sm = NULL; de_ctx = DetectEngineCtxInit(); FAIL_IF_NULL(de_ctx); de_ctx->flags |= DE_QUIET; de_ctx->sig_list = SigInit(de_ctx, "alert tls any any -> any any " "(msg:\"Testing tls_cert_fingerprint\"; " "tls_cert_fingerprint; content:\"XX:XX:XX\"; sid:1;)"); FAIL_IF_NULL(de_ctx->sig_list); /* sm should not be in the MATCH list */ sm = de_ctx->sig_list->sm_lists[DETECT_SM_LIST_MATCH]; FAIL_IF_NOT_NULL(sm); sm = de_ctx->sig_list->sm_lists[g_tls_cert_fingerprint_buffer_id]; FAIL_IF_NULL(sm); FAIL_IF(sm->type != DETECT_CONTENT); FAIL_IF_NOT_NULL(sm->next); SigGroupCleanup(de_ctx); SigCleanSignatures(de_ctx); DetectEngineCtxFree(de_ctx); PASS; } /** * \test Test matching for fingerprint of a certificate. */ static int DetectTlsFingerprintTest02(void) { /* client hello */ uint8_t client_hello[] = { 0x16, 0x03, 0x01, 0x00, 0xc8, 0x01, 0x00, 0x00, 0xc4, 0x03, 0x03, 0xd6, 0x08, 0x5a, 0xa2, 0x86, 0x5b, 0x85, 0xd4, 0x40, 0xab, 0xbe, 0xc0, 0xbc, 0x41, 0xf2, 0x26, 0xf0, 0xfe, 0x21, 0xee, 0x8b, 0x4c, 0x7e, 0x07, 0xc8, 0xec, 0xd2, 0x00, 0x46, 0x4c, 0xeb, 0xb7, 0x00, 0x00, 0x16, 0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x0a, 0xc0, 0x09, 0xc0, 0x13, 0xc0, 0x14, 0x00, 0x33, 0x00, 0x39, 0x00, 0x2f, 0x00, 0x35, 0x00, 0x0a, 0x01, 0x00, 0x00, 0x85, 0x00, 0x00, 0x00, 0x12, 0x00, 0x10, 0x00, 0x00, 0x0d, 0x77, 0x77, 0x77, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x6e, 0x6f, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00, 0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x00, 0x23, 0x00, 0x00, 0x33, 0x74, 0x00, 0x00, 0x00, 0x10, 0x00, 0x29, 0x00, 0x27, 0x05, 0x68, 0x32, 0x2d, 0x31, 0x36, 0x05, 0x68, 0x32, 0x2d, 0x31, 0x35, 0x05, 0x68, 0x32, 0x2d, 0x31, 0x34, 0x02, 0x68, 0x32, 0x08, 0x73, 0x70, 0x64, 0x79, 0x2f, 0x33, 0x2e, 0x31, 0x08, 0x68, 0x74, 0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31, 0x00, 0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x16, 0x00, 0x14, 0x04, 0x01, 0x05, 0x01, 0x06, 0x01, 0x02, 0x01, 0x04, 0x03, 0x05, 0x03, 0x06, 0x03, 0x02, 0x03, 0x04, 0x02, 0x02, 0x02 }; /* server hello */ uint8_t server_hello[] = { 0x16, 0x03, 0x03, 0x00, 0x48, 0x02, 0x00, 0x00, 0x44, 0x03, 0x03, 0x57, 0x91, 0xb8, 0x63, 0xdd, 0xdb, 0xbb, 0x23, 0xcf, 0x0b, 0x43, 0x02, 0x1d, 0x46, 0x11, 0x27, 0x5c, 0x98, 0xcf, 0x67, 0xe1, 0x94, 0x3d, 0x62, 0x7d, 0x38, 0x48, 0x21, 0x23, 0xa5, 0x62, 0x31, 0x00, 0xc0, 0x2f, 0x00, 0x00, 0x1c, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x10, 0x00, 0x05, 0x00, 0x03, 0x02, 0x68, 0x32, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00 }; /* certificate */ uint8_t certificate[] = { 0x16, 0x03, 0x03, 0x04, 0x93, 0x0b, 0x00, 0x04, 0x8f, 0x00, 0x04, 0x8c, 0x00, 0x04, 0x89, 0x30, 0x82, 0x04, 0x85, 0x30, 0x82, 0x03, 0x6d, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x08, 0x5c, 0x19, 0xb7, 0xb1, 0x32, 0x3b, 0x1c, 0xa1, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05, 0x00, 0x30, 0x49, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 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memset(&f, 0, sizeof(Flow)); memset(&ssn, 0, sizeof(TcpSession)); p1 = UTHBuildPacketReal(client_hello, sizeof(client_hello), IPPROTO_TCP, "192.168.1.5", "192.168.1.1", 51251, 443); p2 = UTHBuildPacketReal(server_hello, sizeof(server_hello), IPPROTO_TCP, "192.168.1.1", "192.168.1.5", 443, 51251); p3 = UTHBuildPacketReal(certificate, sizeof(certificate), IPPROTO_TCP, "192.168.1.1", "192.168.1.5", 443, 51251); FLOW_INITIALIZE(&f); f.flags |= FLOW_IPV4; f.proto = IPPROTO_TCP; f.protomap = FlowGetProtoMapping(f.proto); f.alproto = ALPROTO_TLS; p1->flow = &f; p1->flags |= PKT_HAS_FLOW | PKT_STREAM_EST; p1->flowflags |= FLOW_PKT_TOSERVER; p1->flowflags |= FLOW_PKT_ESTABLISHED; p1->pcap_cnt = 1; p2->flow = &f; p2->flags |= PKT_HAS_FLOW | PKT_STREAM_EST; p2->flowflags |= FLOW_PKT_TOCLIENT; p2->flowflags |= FLOW_PKT_ESTABLISHED; p2->pcap_cnt = 2; p3->flow = &f; p3->flags |= PKT_HAS_FLOW | PKT_STREAM_EST; p3->flowflags |= FLOW_PKT_TOCLIENT; p3->flowflags |= FLOW_PKT_ESTABLISHED; p3->pcap_cnt = 3; StreamTcpInitConfig(TRUE); DetectEngineCtx *de_ctx = DetectEngineCtxInit(); FAIL_IF_NULL(de_ctx); de_ctx->mpm_matcher = mpm_default_matcher; de_ctx->flags |= DE_QUIET; s = DetectEngineAppendSig(de_ctx, "alert tls any any -> any any " "(msg:\"Test tls_cert_serial\"; " "tls_cert_fingerprint; " "content:\"4a:a3:66:76:82:cb:6b:23:bb:c3:58:47:23:a4:63:a7:78:a4:a1:18\"; " "sid:1;)"); FAIL_IF_NULL(s); SigGroupBuild(de_ctx); DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx); FLOWLOCK_WRLOCK(&f); int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_TLS, STREAM_TOSERVER, client_hello, sizeof(client_hello)); FLOWLOCK_UNLOCK(&f); FAIL_IF(r != 0); ssl_state = f.alstate; FAIL_IF_NULL(ssl_state); SigMatchSignatures(&tv, de_ctx, det_ctx, p1); FAIL_IF(PacketAlertCheck(p1, 1)); FLOWLOCK_WRLOCK(&f); r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_TLS, STREAM_TOCLIENT, server_hello, sizeof(server_hello)); FLOWLOCK_UNLOCK(&f); FAIL_IF(r != 0); SigMatchSignatures(&tv, de_ctx, det_ctx, p2); FAIL_IF(PacketAlertCheck(p2, 1)); FLOWLOCK_WRLOCK(&f); r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_TLS, STREAM_TOCLIENT, certificate, sizeof(certificate)); FLOWLOCK_UNLOCK(&f); FAIL_IF(r != 0); SigMatchSignatures(&tv, de_ctx, det_ctx, p3); FAIL_IF_NOT(PacketAlertCheck(p3, 1)); AppLayerParserThreadCtxFree(alp_tctx); DetectEngineThreadCtxDeinit(&tv, det_ctx); SigGroupCleanup(de_ctx); DetectEngineCtxFree(de_ctx); StreamTcpFreeConfig(TRUE); FLOW_DESTROY(&f); UTHFreePacket(p1); UTHFreePacket(p2); UTHFreePacket(p3); PASS; } #endif /* UNITTESTS */ static void DetectTlsFingerprintRegisterTests(void) { #ifdef UNITTESTS UtRegisterTest("DetectTlsFingerprintTest01", DetectTlsFingerprintTest01); UtRegisterTest("DetectTlsFingerprintTest02", DetectTlsFingerprintTest02); #endif /* UNITTESTS */ }