diff options
Diffstat (limited to 'framework/src/suricata/src/detect-icmp-seq.c')
| -rw-r--r-- | framework/src/suricata/src/detect-icmp-seq.c | 390 |
1 files changed, 0 insertions, 390 deletions
diff --git a/framework/src/suricata/src/detect-icmp-seq.c b/framework/src/suricata/src/detect-icmp-seq.c deleted file mode 100644 index 4e3fe1ac..00000000 --- a/framework/src/suricata/src/detect-icmp-seq.c +++ /dev/null @@ -1,390 +0,0 @@ -/* Copyright (C) 2007-2010 Open Information Security Foundation - * - * You can copy, redistribute or modify this Program under the terms of - * the GNU General Public License version 2 as published by the Free - * Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -/** - * \file - * - * \author Breno Silva <breno.silva@gmail.com> - * - * Implements the icmp_seq keyword - */ - -#include "suricata-common.h" -#include "debug.h" -#include "decode.h" - -#include "detect.h" -#include "detect-parse.h" - -#include "detect-icmp-seq.h" - -#include "util-byte.h" -#include "util-unittest.h" -#include "util-unittest-helper.h" -#include "util-debug.h" - -#define PARSE_REGEX "^\\s*(\"\\s*)?([0-9]+)(\\s*\")?\\s*$" - -static pcre *parse_regex; -static pcre_extra *parse_regex_study; - -int DetectIcmpSeqMatch(ThreadVars *, DetectEngineThreadCtx *, Packet *, Signature *, const SigMatchCtx *); -static int DetectIcmpSeqSetup(DetectEngineCtx *, Signature *, char *); -void DetectIcmpSeqRegisterTests(void); -void DetectIcmpSeqFree(void *); - -/** - * \brief Registration function for icmp_seq - */ -void DetectIcmpSeqRegister (void) -{ - sigmatch_table[DETECT_ICMP_SEQ].name = "icmp_seq"; - sigmatch_table[DETECT_ICMP_SEQ].desc = "check for a ICMP sequence number"; - sigmatch_table[DETECT_ICMP_SEQ].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Header_keywords#icmp_seq"; - sigmatch_table[DETECT_ICMP_SEQ].Match = DetectIcmpSeqMatch; - sigmatch_table[DETECT_ICMP_SEQ].Setup = DetectIcmpSeqSetup; - sigmatch_table[DETECT_ICMP_SEQ].Free = DetectIcmpSeqFree; - sigmatch_table[DETECT_ICMP_SEQ].RegisterTests = DetectIcmpSeqRegisterTests; - - const char *eb; - int eo; - int opts = 0; - - parse_regex = pcre_compile(PARSE_REGEX, opts, &eb, &eo, NULL); - if (parse_regex == NULL) { - SCLogError(SC_ERR_PCRE_COMPILE,"pcre compile of \"%s\" failed at offset %" PRId32 ": %s", PARSE_REGEX, eo, eb); - goto error; - } - - parse_regex_study = pcre_study(parse_regex, 0, &eb); - if (eb != NULL) { - SCLogError(SC_ERR_PCRE_STUDY,"pcre study failed: %s", eb); - goto error; - } - return; - -error: - return; -} - -/** - * \brief This function is used to match icmp_seq rule option set on a packet - * - * \param t pointer to thread vars - * \param det_ctx pointer to the pattern matcher thread - * \param p pointer to the current packet - * \param m pointer to the sigmatch that we will cast into DetectIcmpSeqData - * - * \retval 0 no match - * \retval 1 match - */ -int DetectIcmpSeqMatch (ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p, Signature *s, const SigMatchCtx *ctx) -{ - uint16_t seqn; - const DetectIcmpSeqData *iseq = (const DetectIcmpSeqData *)ctx; - - if (PKT_IS_PSEUDOPKT(p)) - return 0; - - if (PKT_IS_ICMPV4(p)) { - switch (ICMPV4_GET_TYPE(p)){ - case ICMP_ECHOREPLY: - case ICMP_ECHO: - case ICMP_TIMESTAMP: - case ICMP_TIMESTAMPREPLY: - case ICMP_INFO_REQUEST: - case ICMP_INFO_REPLY: - case ICMP_ADDRESS: - case ICMP_ADDRESSREPLY: - SCLogDebug("ICMPV4_GET_SEQ(p) %"PRIu16" (network byte order), " - "%"PRIu16" (host byte order)", ICMPV4_GET_SEQ(p), - ntohs(ICMPV4_GET_SEQ(p))); - - seqn = ICMPV4_GET_SEQ(p); - break; - default: - SCLogDebug("Packet has no seq field"); - return 0; - } - } else if (PKT_IS_ICMPV6(p)) { - - switch (ICMPV6_GET_TYPE(p)) { - case ICMP6_ECHO_REQUEST: - case ICMP6_ECHO_REPLY: - SCLogDebug("ICMPV6_GET_SEQ(p) %"PRIu16" (network byte order), " - "%"PRIu16" (host byte order)", ICMPV6_GET_SEQ(p), - ntohs(ICMPV6_GET_SEQ(p))); - - seqn = ICMPV6_GET_SEQ(p); - break; - default: - SCLogDebug("Packet has no seq field"); - return 0; - } - } else { - SCLogDebug("Packet not ICMPV4 nor ICMPV6"); - return 0; - } - - if (seqn == iseq->seq) - return 1; - - return 0; -} - -/** - * \brief This function is used to parse icmp_seq option passed via icmp_seq: keyword - * - * \param icmpseqstr Pointer to the user provided icmp_seq options - * - * \retval iseq pointer to DetectIcmpSeqData on success - * \retval NULL on failure - */ -DetectIcmpSeqData *DetectIcmpSeqParse (char *icmpseqstr) -{ - DetectIcmpSeqData *iseq = NULL; - char *substr[3] = {NULL, NULL, NULL}; -#define MAX_SUBSTRINGS 30 - int ret = 0, res = 0; - int ov[MAX_SUBSTRINGS]; - int i; - const char *str_ptr; - - ret = pcre_exec(parse_regex, parse_regex_study, icmpseqstr, strlen(icmpseqstr), 0, 0, ov, MAX_SUBSTRINGS); - if (ret < 1 || ret > 4) { - SCLogError(SC_ERR_PCRE_MATCH,"Parse error %s", icmpseqstr); - goto error; - } - - for (i = 1; i < ret; i++) { - res = pcre_get_substring((char *)icmpseqstr, ov, MAX_SUBSTRINGS, i, &str_ptr); - if (res < 0) { - SCLogError(SC_ERR_PCRE_GET_SUBSTRING,"pcre_get_substring failed"); - goto error; - } - substr[i-1] = (char *)str_ptr; - } - - iseq = SCMalloc(sizeof(DetectIcmpSeqData)); - if (unlikely(iseq == NULL)) - goto error; - - iseq->seq = 0; - - if (substr[0] != NULL && strlen(substr[0]) != 0) { - if (substr[2] == NULL) { - SCLogError(SC_ERR_MISSING_QUOTE,"Missing quote in input"); - goto error; - } - } else { - if (substr[2] != NULL) { - SCLogError(SC_ERR_MISSING_QUOTE,"Missing quote in input"); - goto error; - } - } - - uint16_t seq = 0; - if (ByteExtractStringUint16(&seq, 10, 0, substr[1]) < 0) { - SCLogError(SC_ERR_INVALID_ARGUMENT, "specified icmp seq %s is not " - "valid", substr[1]); - goto error; - } - iseq->seq = htons(seq); - - for (i = 0; i < 3; i++) { - if (substr[i] != NULL) SCFree(substr[i]); - } - - return iseq; - -error: - for (i = 0; i < 3; i++) { - if (substr[i] != NULL) SCFree(substr[i]); - } - if (iseq != NULL) DetectIcmpSeqFree(iseq); - return NULL; - -} - -/** - * \brief this function is used to add the parsed icmp_seq data into the current signature - * - * \param de_ctx pointer to the Detection Engine Context - * \param s pointer to the Current Signature - * \param icmpseqstr pointer to the user provided icmp_seq option - * - * \retval 0 on Success - * \retval -1 on Failure - */ -static int DetectIcmpSeqSetup (DetectEngineCtx *de_ctx, Signature *s, char *icmpseqstr) -{ - DetectIcmpSeqData *iseq = NULL; - SigMatch *sm = NULL; - - iseq = DetectIcmpSeqParse(icmpseqstr); - if (iseq == NULL) goto error; - - sm = SigMatchAlloc(); - if (sm == NULL) goto error; - - sm->type = DETECT_ICMP_SEQ; - sm->ctx = (SigMatchCtx *)iseq; - - SigMatchAppendSMToList(s, sm, DETECT_SM_LIST_MATCH); - - return 0; - -error: - if (iseq != NULL) DetectIcmpSeqFree(iseq); - if (sm != NULL) SCFree(sm); - return -1; - -} - -/** - * \brief this function will free memory associated with DetectIcmpSeqData - * - * \param ptr pointer to DetectIcmpSeqData - */ -void DetectIcmpSeqFree (void *ptr) -{ - DetectIcmpSeqData *iseq = (DetectIcmpSeqData *)ptr; - SCFree(iseq); -} - -#ifdef UNITTESTS - -#include "detect-parse.h" -#include "detect-engine.h" -#include "detect-engine-mpm.h" - -/** - * \test DetectIcmpSeqParseTest01 is a test for setting a valid icmp_seq value - */ -int DetectIcmpSeqParseTest01 (void) -{ - DetectIcmpSeqData *iseq = NULL; - iseq = DetectIcmpSeqParse("300"); - if (iseq != NULL && htons(iseq->seq) == 300) { - DetectIcmpSeqFree(iseq); - return 1; - } - return 0; -} - -/** - * \test DetectIcmpSeqParseTest02 is a test for setting a valid icmp_seq value - * with spaces all around - */ -int DetectIcmpSeqParseTest02 (void) -{ - DetectIcmpSeqData *iseq = NULL; - iseq = DetectIcmpSeqParse(" 300 "); - if (iseq != NULL && htons(iseq->seq) == 300) { - DetectIcmpSeqFree(iseq); - return 1; - } - return 0; -} - -/** - * \test DetectIcmpSeqParseTest03 is a test for setting an invalid icmp_seq value - */ -int DetectIcmpSeqParseTest03 (void) -{ - DetectIcmpSeqData *iseq = NULL; - iseq = DetectIcmpSeqParse("badc"); - if (iseq != NULL) { - DetectIcmpSeqFree(iseq); - return 1; - } - return 0; -} - -/** - * \test DetectIcmpSeqMatchTest01 is a test for checking the working of - * icmp_seq keyword by creating 2 rules and matching a crafted packet - * against them. Only the first one shall trigger. - */ -int DetectIcmpSeqMatchTest01 (void) -{ - int result = 0; - Packet *p = NULL; - Signature *s = NULL; - ThreadVars th_v; - DetectEngineThreadCtx *det_ctx = NULL; - - memset(&th_v, 0, sizeof(th_v)); - - p = UTHBuildPacket(NULL, 0, IPPROTO_ICMP); - p->icmpv4vars.seq = htons(2216); - - DetectEngineCtx *de_ctx = DetectEngineCtxInit(); - if (de_ctx == NULL) { - goto end; - } - - de_ctx->flags |= DE_QUIET; - - s = de_ctx->sig_list = SigInit(de_ctx, "alert icmp any any -> any any (icmp_seq:2216; sid:1;)"); - if (s == NULL) { - goto end; - } - - s = s->next = SigInit(de_ctx, "alert icmp any any -> any any (icmp_seq:5000; sid:2;)"); - if (s == NULL) { - goto end; - } - - SigGroupBuild(de_ctx); - DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx); - - SigMatchSignatures(&th_v, de_ctx, det_ctx, p); - if (PacketAlertCheck(p, 1) == 0) { - printf("sid 1 did not alert, but should have: "); - goto cleanup; - } else if (PacketAlertCheck(p, 2)) { - printf("sid 2 alerted, but should not have: "); - goto cleanup; - } - - result = 1; - -cleanup: - SigGroupCleanup(de_ctx); - SigCleanSignatures(de_ctx); - - DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx); - DetectEngineCtxFree(de_ctx); - - UTHFreePackets(&p, 1); -end: - return result; - -} -#endif /* UNITTESTS */ - -void DetectIcmpSeqRegisterTests (void) -{ -#ifdef UNITTESTS - UtRegisterTest("DetectIcmpSeqParseTest01", DetectIcmpSeqParseTest01, 1); - UtRegisterTest("DetectIcmpSeqParseTest02", DetectIcmpSeqParseTest02, 1); - UtRegisterTest("DetectIcmpSeqParseTest03", DetectIcmpSeqParseTest03, 0); - UtRegisterTest("DetectIcmpSeqMatchTest01", DetectIcmpSeqMatchTest01, 1); -#endif /* UNITTESTS */ -} - |