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1416 lines
33 KiB
C
1416 lines
33 KiB
C
/* Copyright (C) 2007-2020 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 Breno Silva <breno.silva@gmail.com>
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*
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* Implements the flags keyword
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*/
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#include "suricata-common.h"
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#include "suricata.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-prefilter.h"
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#include "detect-engine-prefilter-common.h"
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#include "flow-var.h"
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#include "decode-events.h"
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#include "detect-tcp-flags.h"
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#include "util-unittest.h"
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#include "util-debug.h"
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/**
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* Regex (by Brian Rectanus)
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* flags: [!+*](SAPRFU120)[,SAPRFU12]
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*/
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#define PARSE_REGEX "^\\s*(?:([\\+\\*!]))?\\s*([SAPRFU120CE\\+\\*!]+)(?:\\s*,\\s*([SAPRFU12CE]+))?\\s*$"
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/**
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* Flags args[0] *(3) +(2) !(1)
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*
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*/
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#define MODIFIER_NOT 1
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#define MODIFIER_PLUS 2
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#define MODIFIER_ANY 3
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static DetectParseRegex parse_regex;
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static int DetectFlagsMatch (DetectEngineThreadCtx *, Packet *,
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const Signature *, const SigMatchCtx *);
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static int DetectFlagsSetup (DetectEngineCtx *, Signature *, const char *);
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static void DetectFlagsFree(DetectEngineCtx *, void *);
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static bool PrefilterTcpFlagsIsPrefilterable(const Signature *s);
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static int PrefilterSetupTcpFlags(DetectEngineCtx *de_ctx, SigGroupHead *sgh);
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#ifdef UNITTESTS
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static void FlagsRegisterTests(void);
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#endif
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/**
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* \brief Registration function for flags: keyword
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*/
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void DetectFlagsRegister (void)
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{
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sigmatch_table[DETECT_FLAGS].name = "tcp.flags";
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sigmatch_table[DETECT_FLAGS].alias = "flags";
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sigmatch_table[DETECT_FLAGS].desc = "detect which flags are set in the TCP header";
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sigmatch_table[DETECT_FLAGS].url = "/rules/header-keywords.html#tcp-flags";
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sigmatch_table[DETECT_FLAGS].Match = DetectFlagsMatch;
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sigmatch_table[DETECT_FLAGS].Setup = DetectFlagsSetup;
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sigmatch_table[DETECT_FLAGS].Free = DetectFlagsFree;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_FLAGS].RegisterTests = FlagsRegisterTests;
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#endif
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sigmatch_table[DETECT_FLAGS].SupportsPrefilter = PrefilterTcpFlagsIsPrefilterable;
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sigmatch_table[DETECT_FLAGS].SetupPrefilter = PrefilterSetupTcpFlags;
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DetectSetupParseRegexes(PARSE_REGEX, &parse_regex);
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}
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static inline int FlagsMatch(const uint8_t pflags, const uint8_t modifier,
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const uint8_t dflags, const uint8_t iflags)
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{
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if (!dflags && pflags) {
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if(modifier == MODIFIER_NOT) {
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SCReturnInt(1);
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}
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SCReturnInt(0);
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}
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const uint8_t flags = pflags & iflags;
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switch (modifier) {
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case MODIFIER_ANY:
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if ((flags & dflags) > 0) {
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SCReturnInt(1);
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}
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SCReturnInt(0);
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case MODIFIER_PLUS:
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if (((flags & dflags) == dflags)) {
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SCReturnInt(1);
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}
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SCReturnInt(0);
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case MODIFIER_NOT:
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if ((flags & dflags) != dflags) {
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SCReturnInt(1);
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}
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SCReturnInt(0);
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default:
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SCLogDebug("flags %"PRIu8" and de->flags %"PRIu8"", flags, dflags);
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if (flags == dflags) {
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SCReturnInt(1);
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}
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}
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SCReturnInt(0);
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}
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/**
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* \internal
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* \brief This function is used to match flags on a packet with those passed via flags:
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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 s pointer to the Signature
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* \param m pointer to the sigmatch
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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 DetectFlagsMatch (DetectEngineThreadCtx *det_ctx, Packet *p,
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const Signature *s, const SigMatchCtx *ctx)
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{
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SCEnter();
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if (!(PKT_IS_TCP(p)) || PKT_IS_PSEUDOPKT(p)) {
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SCReturnInt(0);
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}
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const DetectFlagsData *de = (const DetectFlagsData *)ctx;
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const uint8_t flags = p->tcph->th_flags;
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return FlagsMatch(flags, de->modifier, de->flags, de->ignored_flags);
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}
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/**
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* \internal
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* \brief This function is used to parse flags options passed via flags: keyword
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*
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* \param rawstr Pointer to the user provided flags options
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*
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* \retval de pointer to DetectFlagsData on success
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* \retval NULL on failure
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*/
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static DetectFlagsData *DetectFlagsParse (const char *rawstr)
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{
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SCEnter();
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int ret = 0, found = 0, ignore = 0, res = 0;
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size_t pcre2len;
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char *ptr;
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char arg1[16] = "";
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char arg2[16] = "";
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char arg3[16] = "";
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ret = DetectParsePcreExec(&parse_regex, rawstr, 0, 0);
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SCLogDebug("input '%s', pcre said %d", rawstr, ret);
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if (ret < 3) {
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SCLogError("pcre match failed");
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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pcre2len = sizeof(arg1);
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res = SC_Pcre2SubstringCopy(parse_regex.match, 1, (PCRE2_UCHAR8 *)arg1, &pcre2len);
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if (res < 0) {
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SCLogError("pcre2_substring_copy_bynumber failed");
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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if (ret >= 2) {
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pcre2len = sizeof(arg2);
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res = pcre2_substring_copy_bynumber(parse_regex.match, 2, (PCRE2_UCHAR8 *)arg2, &pcre2len);
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if (res < 0) {
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SCLogError("pcre2_substring_copy_bynumber failed");
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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}
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if (ret >= 3) {
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pcre2len = sizeof(arg3);
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res = SC_Pcre2SubstringCopy(parse_regex.match, 3, (PCRE2_UCHAR8 *)arg3, &pcre2len);
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if (res < 0) {
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SCLogError("pcre2_substring_copy_bynumber failed");
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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}
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SCLogDebug("args '%s', '%s', '%s'", arg1, arg2, arg3);
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if (strlen(arg2) == 0) {
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SCLogDebug("empty argument");
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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DetectFlagsData *de = SCMalloc(sizeof(DetectFlagsData));
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if (unlikely(de == NULL))
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goto error;
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memset(de, 0, sizeof(DetectFlagsData));
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de->ignored_flags = 0xff;
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/** First parse args1 */
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ptr = arg1;
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while (*ptr != '\0') {
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switch (*ptr) {
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case 'S':
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case 's':
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de->flags |= TH_SYN;
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found++;
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break;
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case 'A':
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case 'a':
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de->flags |= TH_ACK;
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found++;
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break;
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case 'F':
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case 'f':
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de->flags |= TH_FIN;
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found++;
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break;
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case 'R':
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case 'r':
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de->flags |= TH_RST;
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found++;
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break;
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case 'P':
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case 'p':
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de->flags |= TH_PUSH;
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found++;
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break;
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case 'U':
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case 'u':
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de->flags |= TH_URG;
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found++;
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break;
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case '1':
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de->flags |= TH_CWR;
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found++;
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break;
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case '2':
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de->flags |= TH_ECN;
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found++;
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break;
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case 'C':
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case 'c':
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de->flags |= TH_CWR;
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found++;
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break;
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case 'E':
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case 'e':
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de->flags |= TH_ECN;
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found++;
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break;
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case '0':
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de->flags = 0;
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found++;
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break;
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case '!':
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de->modifier = MODIFIER_NOT;
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break;
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case '+':
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de->modifier = MODIFIER_PLUS;
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break;
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case '*':
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de->modifier = MODIFIER_ANY;
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break;
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}
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ptr++;
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}
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/** Second parse first set of flags */
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if (strlen(arg2) > 0) {
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ptr = arg2;
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while (*ptr != '\0') {
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switch (*ptr) {
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case 'S':
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case 's':
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de->flags |= TH_SYN;
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found++;
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break;
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case 'A':
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case 'a':
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de->flags |= TH_ACK;
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found++;
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break;
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case 'F':
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case 'f':
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de->flags |= TH_FIN;
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found++;
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break;
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case 'R':
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case 'r':
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de->flags |= TH_RST;
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found++;
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break;
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case 'P':
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case 'p':
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de->flags |= TH_PUSH;
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found++;
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break;
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case 'U':
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case 'u':
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de->flags |= TH_URG;
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found++;
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break;
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case '1':
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case 'C':
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case 'c':
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de->flags |= TH_CWR;
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found++;
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break;
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case '2':
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case 'E':
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case 'e':
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de->flags |= TH_ECN;
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found++;
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break;
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case '0':
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de->flags = 0;
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found++;
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break;
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case '!':
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if (de->modifier != 0) {
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SCLogError("\"flags\" supports only"
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" one modifier at a time");
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goto error;
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}
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de->modifier = MODIFIER_NOT;
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SCLogDebug("NOT modifier is set");
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break;
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case '+':
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if (de->modifier != 0) {
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SCLogError("\"flags\" supports only"
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" one modifier at a time");
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goto error;
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}
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de->modifier = MODIFIER_PLUS;
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SCLogDebug("PLUS modifier is set");
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break;
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case '*':
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if (de->modifier != 0) {
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SCLogError("\"flags\" supports only"
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" one modifier at a time");
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goto error;
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}
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de->modifier = MODIFIER_ANY;
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SCLogDebug("ANY modifier is set");
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break;
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default:
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break;
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}
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ptr++;
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}
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if (found == 0)
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goto error;
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}
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/** Finally parse ignored flags */
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if (strlen(arg3) > 0) {
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ptr = arg3;
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while (*ptr != '\0') {
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switch (*ptr) {
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case 'S':
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case 's':
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de->ignored_flags &= ~TH_SYN;
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ignore++;
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break;
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case 'A':
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case 'a':
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de->ignored_flags &= ~TH_ACK;
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ignore++;
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break;
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case 'F':
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case 'f':
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de->ignored_flags &= ~TH_FIN;
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ignore++;
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break;
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case 'R':
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case 'r':
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de->ignored_flags &= ~TH_RST;
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ignore++;
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break;
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case 'P':
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case 'p':
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de->ignored_flags &= ~TH_PUSH;
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ignore++;
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break;
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case 'U':
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case 'u':
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de->ignored_flags &= ~TH_URG;
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ignore++;
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break;
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case '1':
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de->ignored_flags &= ~TH_CWR;
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ignore++;
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break;
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case '2':
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de->ignored_flags &= ~TH_ECN;
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ignore++;
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break;
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case 'C':
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case 'c':
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de->ignored_flags &= ~TH_CWR;
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ignore++;
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break;
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case 'E':
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case 'e':
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de->ignored_flags &= ~TH_ECN;
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ignore++;
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break;
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case '0':
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break;
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default:
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break;
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}
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ptr++;
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}
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if (ignore == 0) {
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SCLogDebug("ignore == 0");
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goto error;
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}
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}
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SCLogDebug("found %"PRId32" ignore %"PRId32"", found, ignore);
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SCReturnPtr(de, "DetectFlagsData");
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error:
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if (de) {
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SCFree(de);
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}
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SCReturnPtr(NULL, "DetectFlagsData");
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}
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|
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/**
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* \internal
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* \brief this function is used to add the parsed flags 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 m pointer to the Current SigMatch
|
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* \param rawstr pointer to the user provided flags options
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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 DetectFlagsSetup (DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
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{
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DetectFlagsData *de = NULL;
|
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SigMatch *sm = NULL;
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|
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de = DetectFlagsParse(rawstr);
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if (de == NULL)
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goto error;
|
|
|
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sm = SigMatchAlloc();
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if (sm == NULL)
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goto error;
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|
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sm->type = DETECT_FLAGS;
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sm->ctx = (SigMatchCtx *)de;
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|
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SigMatchAppendSMToList(s, sm, DETECT_SM_LIST_MATCH);
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s->flags |= SIG_FLAG_REQUIRE_PACKET;
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|
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return 0;
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|
|
|
error:
|
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if (de) SCFree(de);
|
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if (sm) SCFree(sm);
|
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return -1;
|
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}
|
|
|
|
/**
|
|
* \internal
|
|
* \brief this function will free memory associated with DetectFlagsData
|
|
*
|
|
* \param de pointer to DetectFlagsData
|
|
*/
|
|
static void DetectFlagsFree(DetectEngineCtx *de_ctx, void *de_ptr)
|
|
{
|
|
DetectFlagsData *de = (DetectFlagsData *)de_ptr;
|
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if(de) SCFree(de);
|
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}
|
|
|
|
int DetectFlagsSignatureNeedsSynPackets(const Signature *s)
|
|
{
|
|
const SigMatch *sm;
|
|
for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
|
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switch (sm->type) {
|
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case DETECT_FLAGS:
|
|
{
|
|
const DetectFlagsData *fl = (const DetectFlagsData *)sm->ctx;
|
|
|
|
if (!(fl->modifier == MODIFIER_NOT) && (fl->flags & TH_SYN)) {
|
|
return 1;
|
|
}
|
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break;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int DetectFlagsSignatureNeedsSynOnlyPackets(const Signature *s)
|
|
{
|
|
const SigMatch *sm;
|
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for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
|
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switch (sm->type) {
|
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case DETECT_FLAGS:
|
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{
|
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const DetectFlagsData *fl = (const DetectFlagsData *)sm->ctx;
|
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|
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if (!(fl->modifier == MODIFIER_NOT) && (fl->flags == TH_SYN)) {
|
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return 1;
|
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}
|
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break;
|
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}
|
|
}
|
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}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
PrefilterPacketFlagsMatch(DetectEngineThreadCtx *det_ctx, Packet *p, const void *pectx)
|
|
{
|
|
if (!(PKT_IS_TCP(p)) || PKT_IS_PSEUDOPKT(p)) {
|
|
SCReturn;
|
|
}
|
|
|
|
const PrefilterPacketHeaderCtx *ctx = pectx;
|
|
if (!PrefilterPacketHeaderExtraMatch(ctx, p))
|
|
return;
|
|
|
|
const uint8_t flags = p->tcph->th_flags;
|
|
if (FlagsMatch(flags, ctx->v1.u8[0], ctx->v1.u8[1], ctx->v1.u8[2]))
|
|
{
|
|
SCLogDebug("packet matches TCP flags %02x", ctx->v1.u8[1]);
|
|
PrefilterAddSids(&det_ctx->pmq, ctx->sigs_array, ctx->sigs_cnt);
|
|
}
|
|
}
|
|
|
|
static void
|
|
PrefilterPacketFlagsSet(PrefilterPacketHeaderValue *v, void *smctx)
|
|
{
|
|
const DetectFlagsData *a = smctx;
|
|
v->u8[0] = a->modifier;
|
|
v->u8[1] = a->flags;
|
|
v->u8[2] = a->ignored_flags;
|
|
SCLogDebug("v->u8[0] = %02x", v->u8[0]);
|
|
}
|
|
|
|
static bool
|
|
PrefilterPacketFlagsCompare(PrefilterPacketHeaderValue v, void *smctx)
|
|
{
|
|
const DetectFlagsData *a = smctx;
|
|
if (v.u8[0] == a->modifier &&
|
|
v.u8[1] == a->flags &&
|
|
v.u8[2] == a->ignored_flags)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static int PrefilterSetupTcpFlags(DetectEngineCtx *de_ctx, SigGroupHead *sgh)
|
|
{
|
|
return PrefilterSetupPacketHeader(de_ctx, sgh, DETECT_FLAGS,
|
|
PrefilterPacketFlagsSet,
|
|
PrefilterPacketFlagsCompare,
|
|
PrefilterPacketFlagsMatch);
|
|
|
|
}
|
|
|
|
static bool PrefilterTcpFlagsIsPrefilterable(const Signature *s)
|
|
{
|
|
const SigMatch *sm;
|
|
for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
|
|
switch (sm->type) {
|
|
case DETECT_FLAGS:
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* ONLY TESTS BELOW THIS COMMENT
|
|
*/
|
|
|
|
#ifdef UNITTESTS
|
|
/**
|
|
* \test FlagsTestParse01 is a test for a valid flags value
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse01 (void)
|
|
{
|
|
DetectFlagsData *de = DetectFlagsParse("S");
|
|
FAIL_IF_NULL(de);
|
|
FAIL_IF_NOT(de->flags == TH_SYN);
|
|
DetectFlagsFree(NULL, de);
|
|
PASS;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse02 is a test for an invalid flags value
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse02 (void)
|
|
{
|
|
DetectFlagsData *de = NULL;
|
|
de = DetectFlagsParse("G");
|
|
if (de) {
|
|
DetectFlagsFree(NULL, de);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse03 test if ACK and PUSH are set. Must return success
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse03 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ACK|TH_PUSH|TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("AP+");
|
|
|
|
if (de == NULL || (de->flags != (TH_ACK|TH_PUSH)) )
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse04 check if ACK bit is set. Must fails.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse04 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN;
|
|
|
|
de = DetectFlagsParse("A");
|
|
|
|
if (de == NULL || de->flags != TH_ACK)
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Error expected. */
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse05 test if ACK+PUSH and more flags are set. Ignore SYN and RST bits.
|
|
* Must fails.
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse05 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ACK|TH_PUSH|TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("+AP,SR");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_PLUS) || (de->flags != (TH_ACK|TH_PUSH)) || (de->ignored_flags != (TH_SYN|TH_RST)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Error expected. */
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse06 test if ACK+PUSH and more flags are set. Ignore URG and RST bits.
|
|
* Must return success.
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse06 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ACK|TH_PUSH|TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("+AP,UR");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_PLUS) || (de->flags != (TH_ACK|TH_PUSH)) || ((0xff - de->ignored_flags) != (TH_URG|TH_RST)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse07 test if SYN or RST are set. Must fails.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse07 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("*AP");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_ANY) || (de->flags != (TH_ACK|TH_PUSH)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Error expected. */
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse08 test if SYN or RST are set. Must return success.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse08 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("*SA");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_ANY) || (de->flags != (TH_ACK|TH_SYN)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse09 test if SYN and RST are not set. Must fails.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse09 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("!PA");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_NOT) || (de->flags != (TH_ACK|TH_PUSH)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse10 test if ACK and PUSH are not set. Must return success.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse10 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN|TH_RST;
|
|
|
|
de = DetectFlagsParse("!AP");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_NOT) || (de->flags != (TH_ACK|TH_PUSH)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse11 test if ACK or PUSH are set. Ignore SYN and RST. Must fails.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse11 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN|TH_RST|TH_URG;
|
|
|
|
de = DetectFlagsParse("*AP,SR");
|
|
|
|
if (de == NULL || (de->modifier != MODIFIER_ANY) || (de->flags != (TH_ACK|TH_PUSH)) || ((0xff - de->ignored_flags) != (TH_SYN|TH_RST)))
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Expected. */
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test FlagsTestParse12 check if no flags are set. Must fails.
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse12 (void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_SYN;
|
|
|
|
de = DetectFlagsParse("0");
|
|
|
|
if (de == NULL || de->flags != 0) {
|
|
printf("de setup: ");
|
|
goto error;
|
|
}
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if(ret) {
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Expected. */
|
|
error:
|
|
if (de) SCFree(de);
|
|
if (sm) SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test test for a valid flags value
|
|
*
|
|
* \retval 1 on success
|
|
* \retval 0 on failure
|
|
*/
|
|
static int FlagsTestParse13 (void)
|
|
{
|
|
DetectFlagsData *de = NULL;
|
|
de = DetectFlagsParse("+S*");
|
|
if (de != NULL) {
|
|
DetectFlagsFree(NULL, de);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \test Parse 'C' and 'E' flags.
|
|
*
|
|
* \retval 1 on success.
|
|
* \retval 0 on failure.
|
|
*/
|
|
static int FlagsTestParse14(void)
|
|
{
|
|
DetectFlagsData *de = DetectFlagsParse("CE");
|
|
if (de != NULL && (de->flags == (TH_CWR | TH_ECN)) ) {
|
|
DetectFlagsFree(NULL, de);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FlagsTestParse15(void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ECN | TH_CWR | TH_SYN | TH_RST;
|
|
|
|
de = DetectFlagsParse("EC+");
|
|
|
|
if (de == NULL || (de->flags != (TH_ECN | TH_CWR)) )
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if (ret) {
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
static int FlagsTestParse16(void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ECN | TH_SYN | TH_RST;
|
|
|
|
de = DetectFlagsParse("EC*");
|
|
|
|
if (de == NULL || (de->flags != (TH_ECN | TH_CWR)) )
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if (ret) {
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \test Negative test.
|
|
*/
|
|
static int FlagsTestParse17(void)
|
|
{
|
|
Packet *p = PacketGetFromAlloc();
|
|
if (unlikely(p == NULL))
|
|
return 0;
|
|
ThreadVars tv;
|
|
int ret = 0;
|
|
DetectFlagsData *de = NULL;
|
|
SigMatch *sm = NULL;
|
|
IPV4Hdr ipv4h;
|
|
TCPHdr tcph;
|
|
|
|
memset(&tv, 0, sizeof(ThreadVars));
|
|
memset(&ipv4h, 0, sizeof(IPV4Hdr));
|
|
memset(&tcph, 0, sizeof(TCPHdr));
|
|
|
|
p->ip4h = &ipv4h;
|
|
p->tcph = &tcph;
|
|
p->tcph->th_flags = TH_ECN | TH_SYN | TH_RST;
|
|
|
|
de = DetectFlagsParse("EC+");
|
|
|
|
if (de == NULL || (de->flags != (TH_ECN | TH_CWR)) )
|
|
goto error;
|
|
|
|
sm = SigMatchAlloc();
|
|
if (sm == NULL)
|
|
goto error;
|
|
|
|
sm->type = DETECT_FLAGS;
|
|
sm->ctx = (SigMatchCtx *)de;
|
|
|
|
ret = DetectFlagsMatch(NULL, p, NULL, sm->ctx);
|
|
|
|
if (ret == 0) {
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 1;
|
|
}
|
|
|
|
error:
|
|
if (de)
|
|
SCFree(de);
|
|
if (sm)
|
|
SCFree(sm);
|
|
SCFree(p);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \brief this function registers unit tests for Flags
|
|
*/
|
|
static void FlagsRegisterTests(void)
|
|
{
|
|
UtRegisterTest("FlagsTestParse01", FlagsTestParse01);
|
|
UtRegisterTest("FlagsTestParse02", FlagsTestParse02);
|
|
UtRegisterTest("FlagsTestParse03", FlagsTestParse03);
|
|
UtRegisterTest("FlagsTestParse04", FlagsTestParse04);
|
|
UtRegisterTest("FlagsTestParse05", FlagsTestParse05);
|
|
UtRegisterTest("FlagsTestParse06", FlagsTestParse06);
|
|
UtRegisterTest("FlagsTestParse07", FlagsTestParse07);
|
|
UtRegisterTest("FlagsTestParse08", FlagsTestParse08);
|
|
UtRegisterTest("FlagsTestParse09", FlagsTestParse09);
|
|
UtRegisterTest("FlagsTestParse10", FlagsTestParse10);
|
|
UtRegisterTest("FlagsTestParse11", FlagsTestParse11);
|
|
UtRegisterTest("FlagsTestParse12", FlagsTestParse12);
|
|
UtRegisterTest("FlagsTestParse13", FlagsTestParse13);
|
|
UtRegisterTest("FlagsTestParse14", FlagsTestParse14);
|
|
UtRegisterTest("FlagsTestParse15", FlagsTestParse15);
|
|
UtRegisterTest("FlagsTestParse16", FlagsTestParse16);
|
|
UtRegisterTest("FlagsTestParse17", FlagsTestParse17);
|
|
}
|
|
#endif /* UNITTESTS */
|