mirror of https://github.com/OISF/suricata
filename and fileext keywords
Pablo Rincon
15 years ago
committed by
Victor Julien
parent
06b1d71032
commit
6d60b3a747
@ -0,0 +1,298 @@
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/* Copyright (C) 2007-2010 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
|
||||
* 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 Pablo Rincon <pablo.rincon.crespo@gmail.com>
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*
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*/
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#include "suricata-common.h"
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#include "threads.h"
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#include "debug.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 "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-bm.h"
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#include "app-layer.h"
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#include "stream-tcp.h"
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#include "detect-fileext.h"
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/**
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* \brief Regex for parsing the fileext string
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*/
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#define PARSE_REGEX "^\\s*\"\\s*(.+)\\s*\"\\s*$"
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static pcre *parse_regex;
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static pcre_extra *parse_regex_study;
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int DetectFileextMatch (ThreadVars *, DetectEngineThreadCtx *, Flow *, uint8_t, void *, Signature *, SigMatch *);
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static int DetectFileextSetup (DetectEngineCtx *, Signature *, char *);
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void DetectFileextRegisterTests(void);
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void DetectFileextFree(void *);
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/**
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* \brief Registration function for keyword: fileext
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*/
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void DetectFileextRegister(void) {
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sigmatch_table[DETECT_FILEEXT].name = "fileext";
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sigmatch_table[DETECT_FILEEXT].Match = NULL;
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sigmatch_table[DETECT_FILEEXT].AppLayerMatch = DetectFileextMatch;
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sigmatch_table[DETECT_FILEEXT].alproto = ALPROTO_HTTP;
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sigmatch_table[DETECT_FILEEXT].Setup = DetectFileextSetup;
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sigmatch_table[DETECT_FILEEXT].Free = DetectFileextFree;
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sigmatch_table[DETECT_FILEEXT].RegisterTests = DetectFileextRegisterTests;
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const char *eb;
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int eo;
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int opts = 0;
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SCLogDebug("registering fileext rule option");
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parse_regex = pcre_compile(PARSE_REGEX, opts, &eb, &eo, NULL);
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if (parse_regex == NULL) {
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SCLogError(SC_ERR_PCRE_COMPILE, "Compile of \"%s\" failed at offset %" PRId32 ": %s",
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PARSE_REGEX, eo, eb);
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goto error;
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}
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parse_regex_study = pcre_study(parse_regex, 0, &eb);
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if (eb != NULL) {
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SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed: %s", eb);
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goto error;
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}
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return;
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error:
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return;
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}
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/**
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* \brief match the specified file extension
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*
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* \param t pointer to thread vars
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* \param det_ctx pointer to the pattern matcher thread
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* \param p pointer to the current packet
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* \param m pointer to the sigmatch that we will cast into DetectFileextData
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*
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* \retval 0 no match
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* \retval 1 match
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*/
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int DetectFileextMatch (ThreadVars *t, DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags, void *state, Signature *s, SigMatch *m)
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{
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SCEnter();
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int ret = 0;
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DetectFileextData *fileext = m->ctx;
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SCMutexLock(&f->files_m);
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if (f->files != NULL && f->files->cnt > 0) {
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FlowFile *file = f->files->start;
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for (; file != NULL; file = file->next) {
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if (file != NULL && file->ext != NULL &&
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BoyerMooreNocase(fileext->ext, fileext->len, file->ext,
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file->ext_len, fileext->bm_ctx->bmGs, fileext->bm_ctx->bmBc) != NULL)
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{
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ret = 1;
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SCLogDebug("File ext %s found", file->ext);
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/* Stop searching */
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break;
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}
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}
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}
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SCMutexUnlock(&f->files_m);
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SCReturnInt(ret);
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}
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/**
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* \brief This function is used to parse fileet
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*
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* \param str Pointer to the fileext value string
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*
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* \retval pointer to DetectFileextData on success
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* \retval NULL on failure
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*/
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DetectFileextData *DetectFileextParse (char *str)
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{
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DetectFileextData *fileext = NULL;
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#define MAX_SUBSTRINGS 30
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int ret = 0, res = 0;
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int ov[MAX_SUBSTRINGS];
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ret = pcre_exec(parse_regex, parse_regex_study, str, strlen(str), 0, 0,
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ov, MAX_SUBSTRINGS);
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if (ret < 1 || ret > 3) {
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SCLogError(SC_ERR_PCRE_MATCH, "invalid fileext option");
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goto error;
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}
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if (ret > 1) {
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const char *str_ptr;
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res = pcre_get_substring((char *)str, ov, MAX_SUBSTRINGS, 1, &str_ptr);
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if (res < 0) {
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SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
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goto error;
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}
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fileext = SCMalloc(sizeof(DetectFileextData));
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if (fileext == NULL)
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goto error;
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memset(fileext, 0x00, sizeof(DetectFileextData));
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/* Remove quotes if any and copy the filename */
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if (str_ptr[0] == '"') {
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fileext->ext = (uint8_t *)SCStrdup((char*)str_ptr + 1);
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fileext->ext[strlen(str_ptr - 1)] = '\0';
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} else {
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fileext->ext = (uint8_t *)SCStrdup((char*)str_ptr);
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}
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if (fileext->ext == NULL) {
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goto error;
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}
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fileext->len = strlen((char *) fileext->ext);
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fileext->bm_ctx = BoyerMooreCtxInit(fileext->ext, fileext->len);
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BoyerMooreCtxToNocase(fileext->bm_ctx, fileext->ext, fileext->len);
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SCLogDebug("will look for fileext %s", fileext->ext);
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}
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return fileext;
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error:
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if (fileext != NULL)
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DetectFileextFree(fileext);
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return NULL;
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}
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/**
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* \brief this function is used to add the parsed "id" option
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* \brief into the current 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 Current Signature
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* \param idstr pointer to the user provided "id" option
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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 DetectFileextSetup (DetectEngineCtx *de_ctx, Signature *s, char *str)
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{
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DetectFileextData *fileext= NULL;
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SigMatch *sm = NULL;
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fileext = DetectFileextParse(str);
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if (fileext == NULL)
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goto error;
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/* Okay so far so good, lets get this into a SigMatch
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* and put it in the Signature. */
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sm = SigMatchAlloc();
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if (sm == NULL)
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goto error;
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sm->type = DETECT_FILEEXT;
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sm->ctx = (void *)fileext;
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SigMatchAppendAppLayer(s, sm);
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if (s->alproto != ALPROTO_UNKNOWN && s->alproto != ALPROTO_HTTP) {
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SCLogError(SC_ERR_CONFLICTING_RULE_KEYWORDS, "rule contains conflicting keywords.");
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goto error;
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}
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AppLayerHtpNeedFileInspection();
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s->alproto = ALPROTO_HTTP;
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return 0;
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error:
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if (fileext != NULL)
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DetectFileextFree(fileext);
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if (sm != NULL)
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SCFree(sm);
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return -1;
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}
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/**
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* \brief this function will free memory associated with DetectFileextData
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*
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* \param fileext pointer to DetectFileextData
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*/
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void DetectFileextFree(void *ptr) {
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DetectFileextData *fileext = (DetectFileextData *)ptr;
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BoyerMooreCtxDeInit(fileext->bm_ctx);
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SCFree(fileext);
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}
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#ifdef UNITTESTS /* UNITTESTS */
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/**
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* \test DetectFileextTestParse01
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*/
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int DetectFileextTestParse01 (void) {
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return 0;
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}
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/**
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* \test DetectFileextTestParse02
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*/
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int DetectFileextTestParse02 (void) {
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return 0;
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}
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/**
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* \test DetectFileextTestParse03
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*/
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int DetectFileextTestParse03 (void) {
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return 1;
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}
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#include "stream-tcp-reassemble.h"
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#endif /* UNITTESTS */
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/**
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* \brief this function registers unit tests for DetectFileext
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*/
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void DetectFileextRegisterTests(void) {
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#ifdef UNITTESTS /* UNITTESTS */
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UtRegisterTest("DetectFileextTestParse01", DetectFileextTestParse01, 1);
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UtRegisterTest("DetectFileextTestParse02", DetectFileextTestParse02, 1);
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UtRegisterTest("DetectFileextTestParse03", DetectFileextTestParse03, 1);
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#endif /* UNITTESTS */
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}
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@ -0,0 +1,39 @@
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/* Copyright (C) 2007-2010 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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||||
* 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
|
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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 Pablo Rincon <pablo.rincon.crespo@gmail.com>
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*/
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#ifndef __DETECT_FILEEXT_H__
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#define __DETECT_FILEEXT_H__
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#include "util-spm-bm.h"
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typedef struct DetectFileextData_ {
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uint8_t *ext; /** file extension to match */
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uint16_t len; /** length of the file */
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BmCtx *bm_ctx;
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uint8_t flags;
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} DetectFileextData;
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/* prototypes */
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void DetectFileextRegister (void);
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#endif /* __DETECT_FILEEXT_H__ */
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@ -0,0 +1,299 @@
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/* Copyright (C) 2007-2010 Open Information Security Foundation
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*
|
||||
* 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.
|
||||
*/
|
||||
|
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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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*/
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|
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#include "suricata-common.h"
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#include "threads.h"
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#include "debug.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 "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-spm-bm.h"
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#include "util-unittest.h"
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#include "util-unittest-helper.h"
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#include "app-layer.h"
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#include "stream-tcp.h"
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#include "detect-filename.h"
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/**
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* \brief Regex for parsing the protoversion string
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*/
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#define PARSE_REGEX "^\\s*\"\\s*(.+)\\s*\"\\s*$"
|
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|
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static pcre *parse_regex;
|
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static pcre_extra *parse_regex_study;
|
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|
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int DetectFilenameMatch (ThreadVars *, DetectEngineThreadCtx *, Flow *, uint8_t, void *, Signature *, SigMatch *);
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static int DetectFilenameSetup (DetectEngineCtx *, Signature *, char *);
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void DetectFilenameRegisterTests(void);
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void DetectFilenameFree(void *);
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|
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/**
|
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* \brief Registration function for keyword: filename
|
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*/
|
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void DetectFilenameRegister(void) {
|
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sigmatch_table[DETECT_FILENAME].name = "filename";
|
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sigmatch_table[DETECT_FILENAME].Match = NULL;
|
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sigmatch_table[DETECT_FILENAME].AppLayerMatch = DetectFilenameMatch;
|
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sigmatch_table[DETECT_FILENAME].alproto = ALPROTO_HTTP;
|
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sigmatch_table[DETECT_FILENAME].Setup = DetectFilenameSetup;
|
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sigmatch_table[DETECT_FILENAME].Free = DetectFilenameFree;
|
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sigmatch_table[DETECT_FILENAME].RegisterTests = DetectFilenameRegisterTests;
|
||||
|
||||
const char *eb;
|
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int eo;
|
||||
int opts = 0;
|
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|
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SCLogDebug("registering filename rule option");
|
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|
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parse_regex = pcre_compile(PARSE_REGEX, opts, &eb, &eo, NULL);
|
||||
if (parse_regex == NULL) {
|
||||
SCLogError(SC_ERR_PCRE_COMPILE, "Compile of \"%s\" failed at offset %" PRId32 ": %s",
|
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PARSE_REGEX, eo, eb);
|
||||
goto error;
|
||||
}
|
||||
|
||||
parse_regex_study = pcre_study(parse_regex, 0, &eb);
|
||||
if (eb != NULL) {
|
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SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed: %s", eb);
|
||||
goto error;
|
||||
}
|
||||
return;
|
||||
|
||||
error:
|
||||
return;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief match the specified filename
|
||||
*
|
||||
* \param t pointer to thread vars
|
||||
* \param det_ctx pointer to the pattern matcher thread
|
||||
* \param p pointer to the current packet
|
||||
* \param m pointer to the sigmatch that we will cast into DetectFilenameData
|
||||
*
|
||||
* \retval 0 no match
|
||||
* \retval 1 match
|
||||
*/
|
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int DetectFilenameMatch (ThreadVars *t, DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags, void *state, Signature *s, SigMatch *m)
|
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{
|
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SCEnter();
|
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int ret = 0;
|
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|
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DetectFilenameData *filename = m->ctx;
|
||||
|
||||
SCMutexLock(&f->files_m);
|
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if (f->files != NULL && f->files->cnt > 0) {
|
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FlowFile *file = f->files->start;
|
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for (; file != NULL; file = file->next) {
|
||||
if (file != NULL && file->name != NULL &&
|
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BoyerMooreNocase(filename->name, filename->len, file->name,
|
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file->name_len, filename->bm_ctx->bmGs, filename->bm_ctx->bmBc) != NULL)
|
||||
{
|
||||
ret = 1;
|
||||
SCLogDebug("File %s found", file->name);
|
||||
/* Stop searching */
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
SCMutexUnlock(&f->files_m);
|
||||
|
||||
SCReturnInt(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief This function is used to parse IPV4 ip_id passed via keyword: "id"
|
||||
*
|
||||
* \param idstr Pointer to the user provided id option
|
||||
*
|
||||
* \retval filename pointer to DetectFilenameData on success
|
||||
* \retval NULL on failure
|
||||
*/
|
||||
DetectFilenameData *DetectFilenameParse (char *str)
|
||||
{
|
||||
DetectFilenameData *filename = NULL;
|
||||
#define MAX_SUBSTRINGS 30
|
||||
int ret = 0, res = 0;
|
||||
int ov[MAX_SUBSTRINGS];
|
||||
|
||||
ret = pcre_exec(parse_regex, parse_regex_study, str, strlen(str), 0, 0,
|
||||
ov, MAX_SUBSTRINGS);
|
||||
|
||||
if (ret < 1 || ret > 3) {
|
||||
SCLogError(SC_ERR_PCRE_MATCH, "invalid filename option");
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (ret > 1) {
|
||||
const char *str_ptr;
|
||||
res = pcre_get_substring((char *)str, ov, MAX_SUBSTRINGS, 1, &str_ptr);
|
||||
if (res < 0) {
|
||||
SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* We have a correct filename option */
|
||||
filename = SCMalloc(sizeof(DetectFilenameData));
|
||||
if (filename == NULL)
|
||||
goto error;
|
||||
|
||||
memset(filename, 0x00, sizeof(DetectFilenameData));
|
||||
|
||||
if (str_ptr[0] == '"') {
|
||||
filename->name = (uint8_t *)SCStrdup((char*)str_ptr + 1);
|
||||
filename->name[strlen(str_ptr - 1)] = '\0';
|
||||
} else {
|
||||
filename->name = (uint8_t *)SCStrdup((char*)str_ptr);
|
||||
}
|
||||
if (filename->name == NULL) {
|
||||
goto error;
|
||||
}
|
||||
filename->len = strlen((char *) filename->name);
|
||||
filename->bm_ctx = BoyerMooreCtxInit(filename->name, filename->len);
|
||||
BoyerMooreCtxToNocase(filename->bm_ctx, filename->name, filename->len);
|
||||
|
||||
SCLogDebug("will look for filename %s", filename->name);
|
||||
}
|
||||
|
||||
return filename;
|
||||
|
||||
error:
|
||||
if (filename != NULL)
|
||||
DetectFilenameFree(filename);
|
||||
return NULL;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief this function is used to parse filename options
|
||||
* \brief into the current signature
|
||||
*
|
||||
* \param de_ctx pointer to the Detection Engine Context
|
||||
* \param s pointer to the Current Signature
|
||||
* \param str pointer to the user provided "filename" option
|
||||
*
|
||||
* \retval 0 on Success
|
||||
* \retval -1 on Failure
|
||||
*/
|
||||
static int DetectFilenameSetup (DetectEngineCtx *de_ctx, Signature *s, char *str)
|
||||
{
|
||||
DetectFilenameData *filename = NULL;
|
||||
SigMatch *sm = NULL;
|
||||
|
||||
filename = DetectFilenameParse(str);
|
||||
if (filename == NULL)
|
||||
goto error;
|
||||
|
||||
/* Okay so far so good, lets get this into a SigMatch
|
||||
* and put it in the Signature. */
|
||||
sm = SigMatchAlloc();
|
||||
if (sm == NULL)
|
||||
goto error;
|
||||
|
||||
sm->type = DETECT_FILENAME;
|
||||
sm->ctx = (void *)filename;
|
||||
|
||||
SigMatchAppendAppLayer(s, sm);
|
||||
|
||||
if (s->alproto != ALPROTO_UNKNOWN && s->alproto != ALPROTO_HTTP) {
|
||||
SCLogError(SC_ERR_CONFLICTING_RULE_KEYWORDS, "rule contains conflicting keywords.");
|
||||
goto error;
|
||||
}
|
||||
|
||||
AppLayerHtpNeedFileInspection();
|
||||
|
||||
s->alproto = ALPROTO_HTTP;
|
||||
return 0;
|
||||
|
||||
error:
|
||||
if (filename != NULL)
|
||||
DetectFilenameFree(filename);
|
||||
if (sm != NULL)
|
||||
SCFree(sm);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief this function will free memory associated with DetectFilenameData
|
||||
*
|
||||
* \param filename pointer to DetectFilenameData
|
||||
*/
|
||||
void DetectFilenameFree(void *ptr) {
|
||||
DetectFilenameData *filename = (DetectFilenameData *)ptr;
|
||||
BoyerMooreCtxDeInit(filename->bm_ctx);
|
||||
SCFree(filename);
|
||||
}
|
||||
|
||||
#ifdef UNITTESTS /* UNITTESTS */
|
||||
|
||||
/**
|
||||
* \test DetectFilenameTestParse01
|
||||
*/
|
||||
int DetectFilenameTestParse01 (void) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectFilenameTestParse02
|
||||
*/
|
||||
int DetectFilenameTestParse02 (void) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectFilenameTestParse03
|
||||
*/
|
||||
int DetectFilenameTestParse03 (void) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
#include "stream-tcp-reassemble.h"
|
||||
|
||||
#endif /* UNITTESTS */
|
||||
|
||||
/**
|
||||
* \brief this function registers unit tests for DetectFilename
|
||||
*/
|
||||
void DetectFilenameRegisterTests(void) {
|
||||
#ifdef UNITTESTS /* UNITTESTS */
|
||||
UtRegisterTest("DetectFilenameTestParse01", DetectFilenameTestParse01, 1);
|
||||
UtRegisterTest("DetectFilenameTestParse02", DetectFilenameTestParse02, 1);
|
||||
UtRegisterTest("DetectFilenameTestParse03", DetectFilenameTestParse03, 1);
|
||||
#endif /* UNITTESTS */
|
||||
}
|
||||
@ -0,0 +1,38 @@
|
||||
/* Copyright (C) 2007-2010 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 Pablo Rincon <pablo.rincon.crespo@gmail.com>
|
||||
*/
|
||||
|
||||
#ifndef __DETECT_FILENAME_H__
|
||||
#define __DETECT_FILENAME_H__
|
||||
#include "util-spm-bm.h"
|
||||
|
||||
typedef struct DetectFilenameData {
|
||||
uint8_t *name; /** name of the file to match */
|
||||
BmCtx *bm_ctx; /** BM context */
|
||||
uint16_t len; /** name length */
|
||||
uint8_t flags;
|
||||
} DetectFilenameData;
|
||||
|
||||
/* prototypes */
|
||||
void DetectFilenameRegister (void);
|
||||
|
||||
#endif /* __DETECT_FILENAME_H__ */
|
||||
Loading…
Reference in New Issue