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375 lines
13 KiB
C
375 lines
13 KiB
C
/* Copyright (C) 2007-2022 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 Pablo Rincon <pablo.rincon.crespo@gmail.com>
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*
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* Implements support for http_raw_header 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-prefilter.h"
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#include "detect-content.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-profiling.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 "detect-http-raw-header.h"
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static int DetectHttpRawHeaderSetup(DetectEngineCtx *, Signature *, const char *);
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static int DetectHttpRawHeaderSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
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#ifdef UNITTESTS
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static void DetectHttpRawHeaderRegisterTests(void);
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#endif
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static bool DetectHttpRawHeaderValidateCallback(
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const Signature *s, const char **sigerror, const DetectBufferType *dbt);
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static int g_http_raw_header_buffer_id = 0;
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f,
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const uint8_t flow_flags, void *txv, const int list_id);
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static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f, const uint8_t flow_flags, void *txv,
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const int list_id);
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static int PrefilterMpmHttpHeaderRawRequestRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
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MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id);
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static int PrefilterMpmHttpHeaderRawResponseRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
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MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id);
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/**
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* \brief Registers the keyword handlers for the "http_raw_header" keyword.
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*/
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void DetectHttpRawHeaderRegister(void)
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{
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/* http_raw_header content modifier */
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].name = "http_raw_header";
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].desc =
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"content modifier to match the raw HTTP header buffer";
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].url =
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"/rules/http-keywords.html#http-header-and-http-raw-header";
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].Setup = DetectHttpRawHeaderSetup;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].RegisterTests = DetectHttpRawHeaderRegisterTests;
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#endif
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].flags |=
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SIGMATCH_NOOPT | SIGMATCH_INFO_CONTENT_MODIFIER;
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sigmatch_table[DETECT_HTTP_RAW_HEADER_CM].alternative = DETECT_HTTP_RAW_HEADER;
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/* http.header.raw sticky buffer */
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sigmatch_table[DETECT_HTTP_RAW_HEADER].name = "http.header.raw";
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sigmatch_table[DETECT_HTTP_RAW_HEADER].desc = "sticky buffer to match the raw HTTP header buffer";
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sigmatch_table[DETECT_HTTP_RAW_HEADER].url = "/rules/http-keywords.html#http-header-and-http-raw-header";
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sigmatch_table[DETECT_HTTP_RAW_HEADER].Setup = DetectHttpRawHeaderSetupSticky;
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sigmatch_table[DETECT_HTTP_RAW_HEADER].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerInspectEngineRegister("http_raw_header", ALPROTO_HTTP1, SIG_FLAG_TOSERVER,
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HTP_REQUEST_PROGRESS_HEADERS + 1, DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerInspectEngineRegister("http_raw_header", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
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HTP_RESPONSE_PROGRESS_HEADERS + 1, DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerMpmRegister("http_raw_header", SIG_FLAG_TOSERVER, 2,
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PrefilterMpmHttpHeaderRawRequestRegister, NULL, ALPROTO_HTTP1,
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0); /* progress handled in register */
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DetectAppLayerMpmRegister("http_raw_header", SIG_FLAG_TOCLIENT, 2,
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PrefilterMpmHttpHeaderRawResponseRegister, NULL, ALPROTO_HTTP1,
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0); /* progress handled in register */
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DetectAppLayerInspectEngineRegister("http_raw_header", ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
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HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetData2);
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DetectAppLayerInspectEngineRegister("http_raw_header", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
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HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
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DetectAppLayerMpmRegister("http_raw_header", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
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GetData2, ALPROTO_HTTP2, HTTP2StateDataClient);
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DetectAppLayerMpmRegister("http_raw_header", SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
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GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
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DetectBufferTypeSetDescriptionByName("http_raw_header",
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"raw http headers");
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DetectBufferTypeRegisterValidateCallback("http_raw_header",
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DetectHttpRawHeaderValidateCallback);
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g_http_raw_header_buffer_id = DetectBufferTypeGetByName("http_raw_header");
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}
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/**
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* \brief The setup function for the http_raw_header 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 signature for the current Signature being parsed
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* from the rules.
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* \param m Pointer to the head of the SigMatchs 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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int DetectHttpRawHeaderSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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return DetectEngineContentModifierBufferSetup(
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de_ctx, s, arg, DETECT_HTTP_RAW_HEADER_CM, g_http_raw_header_buffer_id, ALPROTO_HTTP1);
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}
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/**
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* \brief this function setup the http.header.raw keyword used in the rule
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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 to which the current 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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*/
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static int DetectHttpRawHeaderSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, g_http_raw_header_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 bool DetectHttpRawHeaderValidateCallback(
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const Signature *s, const char **sigerror, const DetectBufferType *dbt)
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{
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if ((s->flags & (SIG_FLAG_TOCLIENT|SIG_FLAG_TOSERVER)) == (SIG_FLAG_TOCLIENT|SIG_FLAG_TOSERVER)) {
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*sigerror = "http_raw_header signature "
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"without a flow direction. Use flow:to_server for "
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"inspecting request headers or flow:to_client for "
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"inspecting response headers.";
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SCLogError("%s", *sigerror);
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SCReturnInt(false);
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}
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return true;
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}
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f,
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const uint8_t flow_flags, 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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HtpTxUserData *tx_ud = htp_tx_get_user_data(tx);
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const bool ts = ((flow_flags & STREAM_TOSERVER) != 0);
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const uint8_t *data = ts ?
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tx_ud->request_headers_raw : tx_ud->response_headers_raw;
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if (data == NULL)
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return NULL;
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const uint32_t data_len = ts ?
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tx_ud->request_headers_raw_len : tx_ud->response_headers_raw_len;
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InspectionBufferSetupAndApplyTransforms(
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det_ctx, list_id, buffer, data, data_len, transforms);
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}
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return buffer;
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}
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static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f, const uint8_t flow_flags, void *txv,
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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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uint32_t b_len = 0;
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const uint8_t *b = NULL;
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if (rs_http2_tx_get_headers_raw(txv, flow_flags, &b, &b_len) != 1)
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return NULL;
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if (b == NULL || b_len == 0)
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return NULL;
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InspectionBufferSetupAndApplyTransforms(det_ctx, list_id, buffer, b, b_len, transforms);
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}
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return buffer;
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}
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typedef struct PrefilterMpmHttpHeaderRawCtx {
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int list_id;
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const MpmCtx *mpm_ctx;
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const DetectEngineTransforms *transforms;
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} PrefilterMpmHttpHeaderRawCtx;
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/** \brief Generic Mpm prefilter callback
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*
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* \param det_ctx detection engine thread ctx
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* \param p packet to inspect
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* \param f flow to inspect
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* \param txv tx to inspect
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* \param pectx inspection context
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*/
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static void PrefilterMpmHttpHeaderRaw(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
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Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *_txd, const uint8_t flags)
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{
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SCEnter();
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const PrefilterMpmHttpHeaderRawCtx *ctx = pectx;
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const MpmCtx *mpm_ctx = ctx->mpm_ctx;
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SCLogDebug("running on list %d", ctx->list_id);
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const int list_id = ctx->list_id;
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InspectionBuffer *buffer = GetData(det_ctx, ctx->transforms, f,
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flags, txv, list_id);
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if (buffer == NULL)
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return;
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const uint32_t data_len = buffer->inspect_len;
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const uint8_t *data = buffer->inspect;
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SCLogDebug("mpm'ing buffer:");
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//PrintRawDataFp(stdout, data, data_len);
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if (data != NULL && data_len >= mpm_ctx->minlen) {
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(void)mpm_table[mpm_ctx->mpm_type].Search(
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mpm_ctx, &det_ctx->mtc, &det_ctx->pmq, data, data_len);
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PREFILTER_PROFILING_ADD_BYTES(det_ctx, data_len);
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}
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}
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static void PrefilterMpmHttpTrailerRaw(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
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Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *_txd, const uint8_t flags)
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{
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SCEnter();
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htp_tx_t *tx = txv;
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const HtpTxUserData *htud = (const HtpTxUserData *)htp_tx_get_user_data(tx);
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/* if the request wasn't flagged as having a trailer, we skip */
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if (((flags & STREAM_TOSERVER) && !htud->request_has_trailers) ||
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((flags & STREAM_TOCLIENT) && !htud->response_has_trailers)) {
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SCReturn;
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}
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PrefilterMpmHttpHeaderRaw(det_ctx, pectx, p, f, txv, idx, _txd, flags);
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SCReturn;
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}
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static void PrefilterMpmHttpHeaderRawFree(void *ptr)
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{
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SCFree(ptr);
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}
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static int PrefilterMpmHttpHeaderRawRequestRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
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MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
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{
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SCEnter();
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/* header */
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PrefilterMpmHttpHeaderRawCtx *pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->transforms;
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int r = PrefilterAppendTxEngine(de_ctx, sgh, PrefilterMpmHttpHeaderRaw, mpm_reg->app_v2.alproto,
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HTP_REQUEST_PROGRESS_HEADERS + 1, pectx, PrefilterMpmHttpHeaderRawFree, mpm_reg->pname);
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if (r != 0) {
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SCFree(pectx);
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return r;
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}
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/* trailer */
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pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->transforms;
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r = PrefilterAppendTxEngine(de_ctx, sgh, PrefilterMpmHttpTrailerRaw, mpm_reg->app_v2.alproto,
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HTP_REQUEST_PROGRESS_TRAILER + 1, pectx, PrefilterMpmHttpHeaderRawFree, mpm_reg->pname);
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if (r != 0) {
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SCFree(pectx);
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}
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return r;
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}
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static int PrefilterMpmHttpHeaderRawResponseRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
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MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
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{
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SCEnter();
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/* header */
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PrefilterMpmHttpHeaderRawCtx *pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->transforms;
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int r = PrefilterAppendTxEngine(de_ctx, sgh, PrefilterMpmHttpHeaderRaw, mpm_reg->app_v2.alproto,
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HTP_RESPONSE_PROGRESS_HEADERS, pectx, PrefilterMpmHttpHeaderRawFree, mpm_reg->pname);
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if (r != 0) {
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SCFree(pectx);
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return r;
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}
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/* trailer */
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pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->transforms;
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r = PrefilterAppendTxEngine(de_ctx, sgh, PrefilterMpmHttpTrailerRaw, mpm_reg->app_v2.alproto,
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HTP_RESPONSE_PROGRESS_TRAILER, pectx, PrefilterMpmHttpHeaderRawFree, mpm_reg->pname);
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if (r != 0) {
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SCFree(pectx);
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}
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return r;
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}
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/************************************Unittests*********************************/
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#ifdef UNITTESTS
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#include "tests/detect-http-raw-header.c"
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#endif
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/**
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* @}
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*/
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