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572 lines
19 KiB
C
572 lines
19 KiB
C
/* Copyright (C) 2007-2014 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 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 "detect-engine-file.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 "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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#include "app-layer-parser.h"
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static int DetectFilenameMatch (DetectEngineThreadCtx *, Flow *,
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uint8_t, File *, const Signature *, const SigMatchCtx *);
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static int DetectFilenameSetup (DetectEngineCtx *, Signature *, const char *);
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static int DetectFilenameSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
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#ifdef UNITTESTS
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static void DetectFilenameRegisterTests(void);
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#endif
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static void DetectFilenameFree(DetectEngineCtx *, void *);
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static int g_file_match_list_id = 0;
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static int g_file_name_buffer_id = 0;
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static int PrefilterMpmFilenameRegister(DetectEngineCtx *de_ctx,
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SigGroupHead *sgh, MpmCtx *mpm_ctx,
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const DetectBufferMpmRegistery *mpm_reg, int list_id);
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static int DetectEngineInspectFilename(
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DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
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const DetectEngineAppInspectionEngine *engine,
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const Signature *s,
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Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id);
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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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{
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sigmatch_table[DETECT_FILENAME].name = "filename";
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sigmatch_table[DETECT_FILENAME].desc = "match on the file name";
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sigmatch_table[DETECT_FILENAME].url = "/rules/file-keywords.html#filename";
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sigmatch_table[DETECT_FILENAME].FileMatch = DetectFilenameMatch;
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sigmatch_table[DETECT_FILENAME].Setup = DetectFilenameSetup;
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sigmatch_table[DETECT_FILENAME].Free = DetectFilenameFree;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_FILENAME].RegisterTests = DetectFilenameRegisterTests;
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#endif
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sigmatch_table[DETECT_FILENAME].flags = SIGMATCH_QUOTES_OPTIONAL|SIGMATCH_HANDLE_NEGATION;
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sigmatch_table[DETECT_FILENAME].alternative = DETECT_FILE_NAME;
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sigmatch_table[DETECT_FILE_NAME].name = "file.name";
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sigmatch_table[DETECT_FILE_NAME].desc = "sticky buffer to match on the file name";
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sigmatch_table[DETECT_FILE_NAME].url = "/rules/file-keywords.html#filename";
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sigmatch_table[DETECT_FILE_NAME].Setup = DetectFilenameSetupSticky;
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sigmatch_table[DETECT_FILE_NAME].flags = SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerInspectEngineRegister2("files", ALPROTO_HTTP1, SIG_FLAG_TOSERVER,
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HTP_REQUEST_BODY, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2("files", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
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HTP_RESPONSE_BODY, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_SMTP, SIG_FLAG_TOSERVER, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_NFS, SIG_FLAG_TOSERVER, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_NFS, SIG_FLAG_TOCLIENT, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_FTPDATA, SIG_FLAG_TOSERVER, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_FTPDATA, SIG_FLAG_TOCLIENT, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_SMB, SIG_FLAG_TOSERVER, 0, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2(
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"files", ALPROTO_SMB, SIG_FLAG_TOCLIENT, 0, DetectFileInspectGeneric, NULL);
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//this is used by filestore
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DetectAppLayerInspectEngineRegister2("files", ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
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HTTP2StateDataClient, DetectFileInspectGeneric, NULL);
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DetectAppLayerInspectEngineRegister2("files", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
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HTTP2StateDataServer, DetectFileInspectGeneric, NULL);
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g_file_match_list_id = DetectBufferTypeGetByName("files");
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AppProto protos_ts[] = { ALPROTO_HTTP1, ALPROTO_SMTP, ALPROTO_FTP, ALPROTO_FTPDATA, ALPROTO_SMB,
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ALPROTO_NFS, 0 };
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AppProto protos_tc[] = { ALPROTO_HTTP1, ALPROTO_FTP, ALPROTO_FTPDATA, ALPROTO_SMB, ALPROTO_NFS,
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0 };
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for (int i = 0; protos_ts[i] != 0; i++) {
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DetectAppLayerInspectEngineRegister2("file.name", protos_ts[i],
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SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectFilename, NULL);
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DetectAppLayerMpmRegister2("file.name", SIG_FLAG_TOSERVER, 2,
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PrefilterMpmFilenameRegister, NULL, protos_ts[i],
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0);
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}
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for (int i = 0; protos_tc[i] != 0; i++) {
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DetectAppLayerInspectEngineRegister2("file.name", protos_tc[i],
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SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectFilename, NULL);
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DetectAppLayerMpmRegister2("file.name", SIG_FLAG_TOCLIENT, 2,
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PrefilterMpmFilenameRegister, NULL, protos_tc[i],
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0);
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}
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DetectBufferTypeSetDescriptionByName("file.name",
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"http user agent");
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g_file_name_buffer_id = DetectBufferTypeGetByName("file.name");
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SCLogDebug("registering filename rule option");
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return;
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}
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/**
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* \brief match the specified filename
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*
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* \param t thread local vars
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* \param det_ctx pattern matcher thread local data
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* \param f *LOCKED* flow
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* \param flags direction flags
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* \param file file being inspected
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* \param s signature being inspected
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* \param m sigmatch that we will cast into DetectFilenameData
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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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static int DetectFilenameMatch (DetectEngineThreadCtx *det_ctx,
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Flow *f, uint8_t flags, File *file, const Signature *s, const SigMatchCtx *m)
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{
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SCEnter();
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int ret = 0;
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DetectFilenameData *filename = (DetectFilenameData *)m;
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if (file->name == NULL)
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SCReturnInt(0);
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if (BoyerMooreNocase(filename->name, filename->len, file->name,
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file->name_len, filename->bm_ctx) != NULL)
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{
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#ifdef DEBUG
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if (SCLogDebugEnabled()) {
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char *name = SCMalloc(filename->len + 1);
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if (name != NULL) {
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memcpy(name, filename->name, filename->len);
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name[filename->len] = '\0';
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SCLogDebug("will look for filename %s", name);
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SCFree(name);
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}
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}
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#endif
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if (!(filename->flags & DETECT_CONTENT_NEGATED)) {
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ret = 1;
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}
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}
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else if (filename->flags & DETECT_CONTENT_NEGATED) {
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SCLogDebug("negated match");
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ret = 1;
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}
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SCReturnInt(ret);
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}
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/**
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* \brief Parse the filename keyword
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*
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* \param de_ctx Pointer to the detection engine context
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* \param idstr Pointer to the user provided option
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*
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* \retval filename pointer to DetectFilenameData on success
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* \retval NULL on failure
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*/
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static DetectFilenameData *DetectFilenameParse (DetectEngineCtx *de_ctx, const char *str, bool negate)
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{
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DetectFilenameData *filename = NULL;
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/* We have a correct filename option */
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filename = SCMalloc(sizeof(DetectFilenameData));
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if (unlikely(filename == NULL))
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goto error;
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memset(filename, 0x00, sizeof(DetectFilenameData));
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if (DetectContentDataParse ("filename", str, &filename->name, &filename->len) == -1) {
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goto error;
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}
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filename->bm_ctx = BoyerMooreNocaseCtxInit(filename->name, filename->len);
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if (filename->bm_ctx == NULL) {
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goto error;
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}
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if (negate) {
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filename->flags |= DETECT_CONTENT_NEGATED;
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}
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SCLogDebug("flags %02X", filename->flags);
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if (filename->flags & DETECT_CONTENT_NEGATED) {
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SCLogDebug("negated filename");
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}
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#ifdef DEBUG
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if (SCLogDebugEnabled()) {
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char *name = SCMalloc(filename->len + 1);
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if (name != NULL) {
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memcpy(name, filename->name, filename->len);
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name[filename->len] = '\0';
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SCLogDebug("will look for filename %s", name);
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SCFree(name);
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}
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}
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#endif
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return filename;
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error:
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if (filename != NULL)
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DetectFilenameFree(de_ctx, filename);
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return NULL;
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}
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/**
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* \brief this function is used to parse filename options
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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 str pointer to the user provided "filename" 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 DetectFilenameSetup (DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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DetectFilenameData *filename = NULL;
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SigMatch *sm = NULL;
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filename = DetectFilenameParse(de_ctx, str, s->init_data->negated);
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if (filename == 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_FILENAME;
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sm->ctx = (void *)filename;
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SigMatchAppendSMToList(s, sm, g_file_match_list_id);
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s->file_flags |= (FILE_SIG_NEED_FILE|FILE_SIG_NEED_FILENAME);
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return 0;
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error:
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if (filename != NULL)
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DetectFilenameFree(de_ctx, filename);
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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 DetectFilenameData
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*
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* \param filename pointer to DetectFilenameData
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*/
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static void DetectFilenameFree(DetectEngineCtx *de_ctx, void *ptr)
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{
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if (ptr != NULL) {
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DetectFilenameData *filename = (DetectFilenameData *)ptr;
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if (filename->bm_ctx != NULL) {
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BoyerMooreCtxDeInit(filename->bm_ctx);
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}
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if (filename->name != NULL)
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SCFree(filename->name);
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SCFree(filename);
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}
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}
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/* file.name implementation */
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/**
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* \brief this function setup the file.data 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 DetectFilenameSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(s, g_file_name_buffer_id) < 0)
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return -1;
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s->file_flags |= (FILE_SIG_NEED_FILE | FILE_SIG_NEED_FILENAME);
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return 0;
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}
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static InspectionBuffer *FilenameGetDataCallback(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *f, uint8_t flow_flags, File *cur_file,
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int list_id, int local_file_id, bool first)
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{
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SCEnter();
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InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, local_file_id);
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if (buffer == NULL)
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return NULL;
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if (!first && buffer->inspect != NULL)
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return buffer;
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const uint8_t *data = cur_file->name;
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uint32_t data_len = cur_file->name_len;
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InspectionBufferSetupMulti(buffer, transforms, data, data_len);
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SCReturnPtr(buffer, "InspectionBuffer");
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}
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static int DetectEngineInspectFilename(
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DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
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const DetectEngineAppInspectionEngine *engine,
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const Signature *s,
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Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id)
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{
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const DetectEngineTransforms *transforms = NULL;
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if (!engine->mpm) {
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transforms = engine->v2.transforms;
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}
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FileContainer *ffc = AppLayerParserGetFiles(f, flags);
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if (ffc == NULL) {
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return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
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}
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int r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
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int local_file_id = 0;
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for (File *file = ffc->head; file != NULL; file = file->next) {
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if (file->txid != tx_id)
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continue;
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InspectionBuffer *buffer = FilenameGetDataCallback(det_ctx,
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transforms, f, flags, file, engine->sm_list, local_file_id, false);
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if (buffer == NULL)
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continue;
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det_ctx->buffer_offset = 0;
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det_ctx->discontinue_matching = 0;
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det_ctx->inspection_recursion_counter = 0;
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int match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd,
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NULL, f,
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(uint8_t *)buffer->inspect,
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buffer->inspect_len,
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buffer->inspect_offset, DETECT_CI_FLAGS_SINGLE,
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DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE);
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if (match == 1) {
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return DETECT_ENGINE_INSPECT_SIG_MATCH;
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} else {
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r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES;
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}
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local_file_id++;
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}
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return r;
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}
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typedef struct PrefilterMpmFilename {
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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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} PrefilterMpmFilename;
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/** \brief Filedata Filedata 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 PrefilterTxFilename(DetectEngineThreadCtx *det_ctx,
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const void *pectx,
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Packet *p, Flow *f, void *txv,
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const uint64_t idx, const uint8_t flags)
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{
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SCEnter();
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const PrefilterMpmFilename *ctx = (const PrefilterMpmFilename *)pectx;
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const MpmCtx *mpm_ctx = ctx->mpm_ctx;
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const int list_id = ctx->list_id;
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FileContainer *ffc = AppLayerParserGetFiles(f, flags);
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int local_file_id = 0;
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if (ffc != NULL) {
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File *file = ffc->head;
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for (; file != NULL; file = file->next) {
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if (file->txid != idx)
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continue;
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InspectionBuffer *buffer = FilenameGetDataCallback(det_ctx,
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ctx->transforms, f, flags, file, list_id, local_file_id, true);
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if (buffer == NULL)
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continue;
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if (buffer->inspect_len >= mpm_ctx->minlen) {
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(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
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&det_ctx->mtcu, &det_ctx->pmq,
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buffer->inspect, buffer->inspect_len);
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}
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local_file_id++;
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}
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}
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}
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static void PrefilterMpmFilenameFree(void *ptr)
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{
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SCFree(ptr);
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}
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static int PrefilterMpmFilenameRegister(DetectEngineCtx *de_ctx,
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SigGroupHead *sgh, MpmCtx *mpm_ctx,
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const DetectBufferMpmRegistery *mpm_reg, int list_id)
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{
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PrefilterMpmFilename *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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return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxFilename,
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mpm_reg->app_v2.alproto, mpm_reg->app_v2.tx_min_progress,
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pectx, PrefilterMpmFilenameFree, mpm_reg->pname);
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}
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#ifdef UNITTESTS /* UNITTESTS */
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/**
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* \test Test parser accepting valid rules and rejecting invalid rules
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*/
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static int DetectFilenameSignatureParseTest01(void)
|
|
{
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; sid:1;)", true));
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; nocase; sid:1;)", true));
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; endswith; sid:1;)", true));
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; startswith; sid:1;)", true));
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; startswith; endswith; sid:1;)", true));
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; bsize:10; sid:1;)", true));
|
|
|
|
FAIL_IF_NOT(UTHParseSignature("alert http any any -> any any (flow:to_client; file.name; content:\"abc\"; rawbytes; sid:1;)", false));
|
|
FAIL_IF_NOT(UTHParseSignature("alert tcp any any -> any any (flow:to_client; file.name; sid:1;)", false));
|
|
//FAIL_IF_NOT(UTHParseSignature("alert tls any any -> any any (flow:to_client; file.name; content:\"abc\"; sid:1;)", false));
|
|
PASS;
|
|
}
|
|
/**
|
|
* \test DetectFilenameTestParse01
|
|
*/
|
|
static int DetectFilenameTestParse01 (void)
|
|
{
|
|
DetectFilenameData *dnd = DetectFilenameParse(NULL, "secret.pdf", false);
|
|
if (dnd != NULL) {
|
|
DetectFilenameFree(NULL, dnd);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test DetectFilenameTestParse02
|
|
*/
|
|
static int DetectFilenameTestParse02 (void)
|
|
{
|
|
int result = 0;
|
|
|
|
DetectFilenameData *dnd = DetectFilenameParse(NULL, "backup.tar.gz", false);
|
|
if (dnd != NULL) {
|
|
if (dnd->len == 13 && memcmp(dnd->name, "backup.tar.gz", 13) == 0) {
|
|
result = 1;
|
|
}
|
|
|
|
DetectFilenameFree(NULL, dnd);
|
|
return result;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test DetectFilenameTestParse03
|
|
*/
|
|
static int DetectFilenameTestParse03 (void)
|
|
{
|
|
int result = 0;
|
|
|
|
DetectFilenameData *dnd = DetectFilenameParse(NULL, "cmd.exe", false);
|
|
if (dnd != NULL) {
|
|
if (dnd->len == 7 && memcmp(dnd->name, "cmd.exe", 7) == 0) {
|
|
result = 1;
|
|
}
|
|
|
|
DetectFilenameFree(NULL, dnd);
|
|
return result;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief this function registers unit tests for DetectFilename
|
|
*/
|
|
void DetectFilenameRegisterTests(void)
|
|
{
|
|
UtRegisterTest("DetectFilenameSignatureParseTest01", DetectFilenameSignatureParseTest01);
|
|
|
|
UtRegisterTest("DetectFilenameTestParse01", DetectFilenameTestParse01);
|
|
UtRegisterTest("DetectFilenameTestParse02", DetectFilenameTestParse02);
|
|
UtRegisterTest("DetectFilenameTestParse03", DetectFilenameTestParse03);
|
|
}
|
|
#endif /* UNITTESTS */
|