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146 lines
4.4 KiB
C
146 lines
4.4 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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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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* \author Gurvinder Singh <gurvindersinghdahiya@gmail.com>
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*
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* Simple uricontent match part of the detection engine.
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*/
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#include "suricata-common.h"
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#include "decode.h"
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#include "detect.h"
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#include "detect-content.h"
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#include "detect-http-uri.h"
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#include "detect-uricontent.h"
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#include "detect-engine-mpm.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-state.h"
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#include "flow.h"
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#include "detect-flow.h"
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#include "flow-var.h"
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#include "flow-util.h"
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#include "threads.h"
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#include "stream-tcp.h"
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#include "stream.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-protos.h"
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#include "app-layer-htp.h"
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#include "util-mpm.h"
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#include "util-print.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 "conf.h"
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/* prototypes */
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static int DetectUricontentSetup(DetectEngineCtx *, Signature *, const char *);
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static void DetectUricontentFree(DetectEngineCtx *de_ctx, void *);
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static int g_http_uri_buffer_id = 0;
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/**
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* \brief Registration function for uricontent: keyword
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*/
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void DetectUricontentRegister (void)
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{
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sigmatch_table[DETECT_URICONTENT].name = "uricontent";
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sigmatch_table[DETECT_URICONTENT].desc = "legacy keyword to match on the request URI buffer";
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sigmatch_table[DETECT_URICONTENT].url = "/rules/http-keywords.html#uricontent";
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sigmatch_table[DETECT_URICONTENT].Match = NULL;
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sigmatch_table[DETECT_URICONTENT].Setup = DetectUricontentSetup;
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sigmatch_table[DETECT_URICONTENT].Free = DetectUricontentFree;
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sigmatch_table[DETECT_URICONTENT].flags = (SIGMATCH_QUOTES_MANDATORY|SIGMATCH_HANDLE_NEGATION);
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sigmatch_table[DETECT_URICONTENT].alternative = DETECT_HTTP_URI;
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g_http_uri_buffer_id = DetectBufferTypeRegister("http_uri");
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}
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/**
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* \brief this function will Free memory associated with DetectContentData
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*
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* \param cd pointer to DetectUricontentData
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*/
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void DetectUricontentFree(DetectEngineCtx *de_ctx, void *ptr)
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{
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SCEnter();
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DetectContentData *cd = (DetectContentData *)ptr;
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if (cd == NULL)
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SCReturn;
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SpmDestroyCtx(cd->spm_ctx);
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SCFree(cd);
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SCReturn;
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}
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/**
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* \brief Creates a SigMatch for the uricontent keyword being sent as argument,
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* and appends it to the Signature(s).
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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 contentstr Pointer to the string holding the keyword value
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*
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* \retval 0 on success, -1 on failure
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*/
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int DetectUricontentSetup(DetectEngineCtx *de_ctx, Signature *s, const char *contentstr)
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{
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SCEnter();
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const char *legacy = NULL;
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if (ConfGet("legacy.uricontent", &legacy) == 1) {
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if (strcasecmp("disabled", legacy) == 0) {
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SCLogError("uricontent deprecated. To "
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"use a rule with \"uricontent\", either set the "
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"option - \"legacy.uricontent\" in the conf to "
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"\"enabled\" OR replace uricontent with "
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"\'content:%s; http_uri;\'.",
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contentstr);
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goto error;
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} else if (strcasecmp("enabled", legacy) == 0) {
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;
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} else {
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SCLogError("Invalid value found "
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"for legacy.uricontent - \"%s\". Valid values are "
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"\"enabled\" OR \"disabled\".",
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legacy);
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goto error;
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}
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}
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if (DetectContentSetup(de_ctx, s, contentstr) < 0)
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goto error;
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if (DetectHttpUriSetup(de_ctx, s, NULL) < 0)
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goto error;
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SCReturnInt(0);
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error:
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SCReturnInt(-1);
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}
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