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344 lines
10 KiB
C
344 lines
10 KiB
C
/* Copyright (C) 2007-2016 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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* \ingroup httplayer
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*
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* @{
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Implements support for the http_request_line 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-mpm.h"
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#include "detect-engine-state.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-pcre.h"
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#include "flow.h"
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#include "flow-var.h"
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#include "flow-util.h"
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#include "util-debug.h"
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#include "util-unittest.h"
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#include "util-unittest-helper.h"
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#include "util-spm.h"
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#include "app-layer.h"
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#include "app-layer-parser.h"
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#include "app-layer-htp.h"
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#include "stream-tcp.h"
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#include "detect-http-request-line.h"
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static int DetectHttpRequestLineSetup(DetectEngineCtx *, Signature *, const char *);
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static void DetectHttpRequestLineRegisterTests(void);
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *_f, const uint8_t _flow_flags,
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void *txv, const int list_id);
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static int g_http_request_line_buffer_id = 0;
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/**
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* \brief Registers the keyword handlers for the "http_request_line" keyword.
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*/
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void DetectHttpRequestLineRegister(void)
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{
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].name = "http.request_line";
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].alias = "http_request_line";
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].desc = "sticky buffer to match on the HTTP request line";
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].url = DOC_URL DOC_VERSION "/rules/http-keywords.html#http-request-line";
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].Match = NULL;
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].Setup = DetectHttpRequestLineSetup;
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].RegisterTests = DetectHttpRequestLineRegisterTests;
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sigmatch_table[DETECT_AL_HTTP_REQUEST_LINE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerInspectEngineRegister2("http_request_line",
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ALPROTO_HTTP, SIG_FLAG_TOSERVER, HTP_REQUEST_LINE,
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DetectEngineInspectBufferGeneric,
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GetData);
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DetectAppLayerMpmRegister2("http_request_line", SIG_FLAG_TOSERVER, 2,
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PrefilterGenericMpmRegister, GetData,
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ALPROTO_HTTP, HTP_REQUEST_LINE);
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DetectBufferTypeSetDescriptionByName("http_request_line",
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"http request line");
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g_http_request_line_buffer_id = DetectBufferTypeGetByName("http_request_line");
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}
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/**
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* \brief The setup function for the http_request_line keyword for a signature.
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*
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* \param de_ctx Pointer to the detection engine context.
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* \param s Pointer to the signature for the current Signature being
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* parsed from the rules.
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* \param m Pointer to the head of the SigMatch for the current rule
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* being parsed.
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* \param arg Pointer to the string holding the keyword value.
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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 DetectHttpRequestLineSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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if (DetectBufferSetActiveList(s, g_http_request_line_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0)
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return -1;
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return 0;
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}
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *_f, const uint8_t _flow_flags,
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void *txv, const int list_id)
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{
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InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
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if (buffer->inspect == NULL) {
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htp_tx_t *tx = (htp_tx_t *)txv;
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if (unlikely(tx->request_line == NULL)) {
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return NULL;
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}
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const uint32_t data_len = bstr_len(tx->request_line);
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const uint8_t *data = bstr_ptr(tx->request_line);
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InspectionBufferSetup(buffer, data, data_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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}
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return buffer;
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}
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/************************************Unittests*********************************/
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#ifdef UNITTESTS
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#include "stream-tcp-reassemble.h"
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/**
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* \test Test that a signature containting a http_request_line is correctly parsed
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* and the keyword is registered.
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*/
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static int DetectHttpRequestLineTest01(void)
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{
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DetectEngineCtx *de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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de_ctx->flags |= DE_QUIET;
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de_ctx->sig_list = SigInit(de_ctx, "alert tcp any any -> any any "
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"(http_request_line; content:\"GET /\"; sid:1;)");
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FAIL_IF_NULL(de_ctx->sig_list);
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DetectEngineCtxFree(de_ctx);
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PASS;
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}
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/**
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*\test Test that the http_request_line content matches against a http request
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* which holds the content.
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*/
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static int DetectHttpRequestLineTest02(void)
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{
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TcpSession ssn;
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Packet *p = NULL;
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ThreadVars th_v;
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DetectEngineCtx *de_ctx = NULL;
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DetectEngineThreadCtx *det_ctx = NULL;
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HtpState *http_state = NULL;
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Flow f;
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uint8_t http_buf[] =
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"GET /index.html HTTP/1.0\r\n"
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"Host: www.openinfosecfoundation.org\r\n"
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"User-Agent: This is dummy message body\r\n"
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"Content-Type: text/html\r\n"
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"\r\n";
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uint32_t http_len = sizeof(http_buf) - 1;
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AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
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FAIL_IF_NULL(alp_tctx);
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memset(&th_v, 0, sizeof(th_v));
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memset(&f, 0, sizeof(f));
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memset(&ssn, 0, sizeof(ssn));
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p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
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FAIL_IF_NULL(p);
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FLOW_INITIALIZE(&f);
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f.protoctx = (void *)&ssn;
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f.proto = IPPROTO_TCP;
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f.flags |= FLOW_IPV4;
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p->flow = &f;
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p->flowflags |= FLOW_PKT_TOSERVER;
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p->flowflags |= FLOW_PKT_ESTABLISHED;
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p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
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f.alproto = ALPROTO_HTTP;
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StreamTcpInitConfig(TRUE);
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de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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de_ctx->flags |= DE_QUIET;
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de_ctx->sig_list = SigInit(de_ctx,"alert http any any -> any any "
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"(http_request_line; content:\"GET /index.html HTTP/1.0\"; "
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"sid:1;)");
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FAIL_IF_NULL(de_ctx->sig_list);
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SigGroupBuild(de_ctx);
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DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
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int r = AppLayerParserParse(&th_v, alp_tctx, &f, ALPROTO_HTTP, STREAM_TOSERVER, http_buf, http_len);
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FAIL_IF(r != 0);
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http_state = f.alstate;
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FAIL_IF_NULL(http_state);
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/* do detect */
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SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
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FAIL_IF(!(PacketAlertCheck(p, 1)));
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AppLayerParserThreadCtxFree(alp_tctx);
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DetectEngineCtxFree(de_ctx);
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StreamTcpFreeConfig(TRUE);
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FLOW_DESTROY(&f);
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UTHFreePackets(&p, 1);
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PASS;
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}
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static int DetectHttpRequestLineWrapper(const char *sig, const int expectation)
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{
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TcpSession ssn;
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Packet *p = NULL;
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ThreadVars th_v;
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DetectEngineCtx *de_ctx = NULL;
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DetectEngineThreadCtx *det_ctx = NULL;
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HtpState *http_state = NULL;
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Flow f;
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uint8_t http_buf[] =
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"GET /index.html HTTP/1.0\r\n"
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"Host: www.openinfosecfoundation.org\r\n"
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"User-Agent: This is dummy message body\r\n"
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"Content-Type: text/html\r\n"
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"\r\n";
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uint32_t http_len = sizeof(http_buf) - 1;
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AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
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FAIL_IF_NULL(alp_tctx);
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memset(&th_v, 0, sizeof(th_v));
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memset(&f, 0, sizeof(f));
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memset(&ssn, 0, sizeof(ssn));
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p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
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FAIL_IF_NULL(p);
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FLOW_INITIALIZE(&f);
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f.protoctx = (void *)&ssn;
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f.proto = IPPROTO_TCP;
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f.flags |= FLOW_IPV4;
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p->flow = &f;
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p->flowflags |= FLOW_PKT_TOSERVER;
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p->flowflags |= FLOW_PKT_ESTABLISHED;
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p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
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f.alproto = ALPROTO_HTTP;
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StreamTcpInitConfig(TRUE);
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de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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de_ctx->flags |= DE_QUIET;
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de_ctx->sig_list = SigInit(de_ctx, sig);
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FAIL_IF_NULL(de_ctx->sig_list);
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int sid = de_ctx->sig_list->id;
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SigGroupBuild(de_ctx);
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DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
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int r = AppLayerParserParse(&th_v, alp_tctx, &f, ALPROTO_HTTP, STREAM_TOSERVER, http_buf, http_len);
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FAIL_IF(r != 0);
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http_state = f.alstate;
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FAIL_IF_NULL(http_state);
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/* do detect */
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SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
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r = PacketAlertCheck(p, sid);
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FAIL_IF_NOT(r == expectation);
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AppLayerParserThreadCtxFree(alp_tctx);
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DetectEngineCtxFree(de_ctx);
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StreamTcpFreeConfig(TRUE);
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FLOW_DESTROY(&f);
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UTHFreePackets(&p, 1);
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PASS;
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}
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static int DetectHttpRequestLineTest03(void)
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{
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FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:>10; sid:1;)", true));
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FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:<100; sid:2;)", true));
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FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:10<>100; sid:3;)", true));
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FAIL_IF_NOT(DetectHttpRequestLineWrapper("alert http any any -> any any (http_request_line; bsize:>100; sid:3;)", false));
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PASS;
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}
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#endif /* UNITTESTS */
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static void DetectHttpRequestLineRegisterTests(void)
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{
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#ifdef UNITTESTS
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UtRegisterTest("DetectHttpRequestLineTest01", DetectHttpRequestLineTest01);
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UtRegisterTest("DetectHttpRequestLineTest02", DetectHttpRequestLineTest02);
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UtRegisterTest("DetectHttpRequestLineTest03", DetectHttpRequestLineTest03);
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#endif /* UNITTESTS */
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return;
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}
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/**
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* @}
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*/
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