/* 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 httplayer * * @{ */ /** * \file * * \author Victor Julien * * Implements support for the http_request_line 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-state.h" #include "detect-engine-prefilter.h" #include "detect-engine-content-inspection.h" #include "detect-content.h" #include "detect-pcre.h" #include "flow.h" #include "flow-var.h" #include "flow-util.h" #include "util-debug.h" #include "util-unittest.h" #include "util-unittest-helper.h" #include "util-spm.h" #include "app-layer.h" #include "app-layer-parser.h" #include "app-layer-htp.h" #include "stream-tcp.h" #include "detect-http-request-line.h" static int DetectHttpRequestLineSetup(DetectEngineCtx *, Signature *, const char *); static void DetectHttpRequestLineRegisterTests(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_http_request_line_buffer_id = 0; /** * \brief Registers the keyword handlers for the "http_request_line" keyword. */ void DetectHttpRequestLineRegister(void) { sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].name = "http.request_line"; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].alias = "http_request_line"; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].desc = "sticky buffer to match on the HTTP request line"; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].url = DOC_URL DOC_VERSION "/rules/http-keywords.html#http-request-line"; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].Match = NULL; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].Setup = DetectHttpRequestLineSetup; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].RegisterTests = DetectHttpRequestLineRegisterTests; sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER; DetectAppLayerInspectEngineRegister2("http_request_line", ALPROTO_HTTP, SIG_FLAG_TOSERVER, HTP_REQUEST_LINE, DetectEngineInspectBufferGeneric, GetData); DetectAppLayerMpmRegister2("http_request_line", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, GetData, ALPROTO_HTTP, HTP_REQUEST_LINE); DetectBufferTypeSetDescriptionByName("http_request_line", "http request line"); g_http_request_line_buffer_id = DetectBufferTypeGetByName("http_request_line"); } /** * \brief The setup function for the http_request_line keyword for a signature. * * \param de_ctx Pointer to the detection engine context. * \param s Pointer to the signature for the current Signature being * parsed from the rules. * \param m Pointer to the head of the SigMatch for the current rule * being parsed. * \param arg Pointer to the string holding the keyword value. * * \retval 0 On success * \retval -1 On failure */ static int DetectHttpRequestLineSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg) { if (DetectBufferSetActiveList(s, g_http_request_line_buffer_id) < 0) return -1; if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 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) { InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id); if (buffer->inspect == NULL) { htp_tx_t *tx = (htp_tx_t *)txv; if (unlikely(tx->request_line == NULL)) { return NULL; } const uint32_t data_len = bstr_len(tx->request_line); const uint8_t *data = bstr_ptr(tx->request_line); InspectionBufferSetup(buffer, data, data_len); InspectionBufferApplyTransforms(buffer, transforms); } return buffer; } /************************************Unittests*********************************/ #ifdef UNITTESTS #include "stream-tcp-reassemble.h" /** * \test Test that a signature containting a http_request_line is correctly parsed * and the keyword is registered. */ static int DetectHttpRequestLineTest01(void) { DetectEngineCtx *de_ctx = DetectEngineCtxInit(); FAIL_IF_NULL(de_ctx); de_ctx->flags |= DE_QUIET; de_ctx->sig_list = SigInit(de_ctx, "alert tcp any any -> any any " "(http_request_line; content:\"GET /\"; sid:1;)"); FAIL_IF_NULL(de_ctx->sig_list); DetectEngineCtxFree(de_ctx); PASS; } /** *\test Test that the http_request_line content matches against a http request * which holds the content. */ static int DetectHttpRequestLineTest02(void) { TcpSession ssn; Packet *p = NULL; ThreadVars th_v; DetectEngineCtx *de_ctx = NULL; DetectEngineThreadCtx *det_ctx = NULL; HtpState *http_state = NULL; Flow f; uint8_t http_buf[] = "GET /index.html HTTP/1.0\r\n" "Host: www.openinfosecfoundation.org\r\n" "User-Agent: This is dummy message body\r\n" "Content-Type: text/html\r\n" "\r\n"; uint32_t http_len = sizeof(http_buf) - 1; AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc(); FAIL_IF_NULL(alp_tctx); memset(&th_v, 0, sizeof(th_v)); memset(&f, 0, sizeof(f)); memset(&ssn, 0, sizeof(ssn)); p = UTHBuildPacket(NULL, 0, IPPROTO_TCP); FAIL_IF_NULL(p); FLOW_INITIALIZE(&f); f.protoctx = (void *)&ssn; f.proto = IPPROTO_TCP; f.flags |= FLOW_IPV4; p->flow = &f; p->flowflags |= FLOW_PKT_TOSERVER; p->flowflags |= FLOW_PKT_ESTABLISHED; p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST; f.alproto = ALPROTO_HTTP; StreamTcpInitConfig(TRUE); de_ctx = DetectEngineCtxInit(); FAIL_IF_NULL(de_ctx); de_ctx->flags |= DE_QUIET; de_ctx->sig_list = SigInit(de_ctx,"alert http any any -> any any " "(http_request_line; content:\"GET /index.html HTTP/1.0\"; " "sid:1;)"); FAIL_IF_NULL(de_ctx->sig_list); SigGroupBuild(de_ctx); DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx); int r = AppLayerParserParse(&th_v, alp_tctx, &f, ALPROTO_HTTP, STREAM_TOSERVER, http_buf, http_len); FAIL_IF(r != 0); http_state = f.alstate; FAIL_IF_NULL(http_state); /* do detect */ SigMatchSignatures(&th_v, de_ctx, det_ctx, p); FAIL_IF(!(PacketAlertCheck(p, 1))); AppLayerParserThreadCtxFree(alp_tctx); DetectEngineCtxFree(de_ctx); StreamTcpFreeConfig(TRUE); FLOW_DESTROY(&f); UTHFreePackets(&p, 1); PASS; } static int DetectHttpRequestLineWrapper(const char *sig, const int expectation) { TcpSession ssn; Packet *p = NULL; ThreadVars th_v; DetectEngineCtx *de_ctx = NULL; DetectEngineThreadCtx *det_ctx = NULL; HtpState *http_state = NULL; Flow f; uint8_t http_buf[] = "GET /index.html HTTP/1.0\r\n" "Host: www.openinfosecfoundation.org\r\n" "User-Agent: This is dummy message body\r\n" "Content-Type: text/html\r\n" "\r\n"; uint32_t http_len = sizeof(http_buf) - 1; AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc(); FAIL_IF_NULL(alp_tctx); memset(&th_v, 0, sizeof(th_v)); memset(&f, 0, sizeof(f)); memset(&ssn, 0, sizeof(ssn)); p = UTHBuildPacket(NULL, 0, IPPROTO_TCP); FAIL_IF_NULL(p); FLOW_INITIALIZE(&f); f.protoctx = (void *)&ssn; f.proto = IPPROTO_TCP; f.flags |= FLOW_IPV4; p->flow = &f; p->flowflags |= FLOW_PKT_TOSERVER; p->flowflags |= FLOW_PKT_ESTABLISHED; p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST; f.alproto = ALPROTO_HTTP; StreamTcpInitConfig(TRUE); de_ctx = DetectEngineCtxInit(); FAIL_IF_NULL(de_ctx); de_ctx->flags |= DE_QUIET; de_ctx->sig_list = SigInit(de_ctx, sig); FAIL_IF_NULL(de_ctx->sig_list); int sid = de_ctx->sig_list->id; SigGroupBuild(de_ctx); DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx); int r = AppLayerParserParse(&th_v, alp_tctx, &f, ALPROTO_HTTP, STREAM_TOSERVER, http_buf, http_len); FAIL_IF(r != 0); http_state = f.alstate; FAIL_IF_NULL(http_state); /* do detect */ SigMatchSignatures(&th_v, de_ctx, det_ctx, p); r = PacketAlertCheck(p, sid); FAIL_IF_NOT(r == expectation); AppLayerParserThreadCtxFree(alp_tctx); DetectEngineCtxFree(de_ctx); StreamTcpFreeConfig(TRUE); FLOW_DESTROY(&f); UTHFreePackets(&p, 1); PASS; } static int DetectHttpRequestLineTest03(void) { FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:>10; sid:1;)", true)); FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:<100; sid:2;)", true)); FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:10<>100; sid:3;)", true)); FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:>100; sid:3;)", false)); PASS; } #endif /* UNITTESTS */ static void DetectHttpRequestLineRegisterTests(void) { #ifdef UNITTESTS UtRegisterTest("DetectHttpRequestLineTest01", DetectHttpRequestLineTest01); UtRegisterTest("DetectHttpRequestLineTest02", DetectHttpRequestLineTest02); UtRegisterTest("DetectHttpRequestLineTest03", DetectHttpRequestLineTest03); #endif /* UNITTESTS */ return; } /** * @} */