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/* Copyright (C) 2007-2022 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 Victor Julien <victor@inliniac.net>
* \author Gurvinder Singh <gurvindersinghdahiya@gmail.com>
*
* Simple uricontent match part of the detection engine.
*/
#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-content.h"
#include "detect-http-uri.h"
#include "detect-uricontent.h"
#include "detect-engine-mpm.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-state.h"
#include "flow.h"
#include "detect-flow.h"
#include "flow-var.h"
#include "flow-util.h"
#include "threads.h"
#include "stream-tcp.h"
#include "stream.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-protos.h"
#include "app-layer-htp.h"
#include "util-mpm.h"
#include "util-print.h"
#include "util-debug.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-spm.h"
#include "conf.h"
/* prototypes */
static int DetectUricontentSetup(DetectEngineCtx *, Signature *, const char *);
static void DetectUricontentFree(DetectEngineCtx *de_ctx, void *);
static int g_http_uri_buffer_id = 0;
/**
* \brief Registration function for uricontent: keyword
*/
void DetectUricontentRegister (void)
{
sigmatch_table[DETECT_URICONTENT].name = "uricontent";
sigmatch_table[DETECT_URICONTENT].desc = "legacy keyword to match on the request URI buffer";
sigmatch_table[DETECT_URICONTENT].url = "/rules/http-keywords.html#uricontent";
sigmatch_table[DETECT_URICONTENT].Match = NULL;
sigmatch_table[DETECT_URICONTENT].Setup = DetectUricontentSetup;
sigmatch_table[DETECT_URICONTENT].Free = DetectUricontentFree;
sigmatch_table[DETECT_URICONTENT].flags = (SIGMATCH_QUOTES_MANDATORY|SIGMATCH_HANDLE_NEGATION);
sigmatch_table[DETECT_URICONTENT].alternative = DETECT_HTTP_URI;
g_http_uri_buffer_id = DetectBufferTypeRegister("http_uri");
}
/**
* \brief this function will Free memory associated with DetectContentData
*
* \param cd pointer to DetectUricontentData
*/
void DetectUricontentFree(DetectEngineCtx *de_ctx, void *ptr)
{
SCEnter();
DetectContentData *cd = (DetectContentData *)ptr;
if (cd == NULL)
SCReturn;
SpmDestroyCtx(cd->spm_ctx);
SCFree(cd);
SCReturn;
}
/**
* \brief Creates a SigMatch for the uricontent keyword being sent as argument,
* and appends it to the Signature(s).
*
* \param de_ctx Pointer to the detection engine context
* \param s Pointer to signature for the current Signature being parsed
* from the rules
* \param contentstr Pointer to the string holding the keyword value
*
* \retval 0 on success, -1 on failure
*/
int DetectUricontentSetup(DetectEngineCtx *de_ctx, Signature *s, const char *contentstr)
{
SCEnter();
const char *legacy = NULL;
if (ConfGet("legacy.uricontent", &legacy) == 1) {
if (strcasecmp("disabled", legacy) == 0) {
SCLogError("uricontent deprecated. To "
"use a rule with \"uricontent\", either set the "
"option - \"legacy.uricontent\" in the conf to "
"\"enabled\" OR replace uricontent with "
"\'content:%s; http_uri;\'.",
contentstr);
goto error;
} else if (strcasecmp("enabled", legacy) == 0) {
;
} else {
SCLogError("Invalid value found "
"for legacy.uricontent - \"%s\". Valid values are "
"\"enabled\" OR \"disabled\".",
legacy);
goto error;
}
}
if (DetectContentSetup(de_ctx, s, contentstr) < 0)
goto error;
if (DetectHttpUriSetup(de_ctx, s, NULL) < 0)
goto error;
SCReturnInt(0);
error:
SCReturnInt(-1);
}
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