mirror of https://github.com/OISF/suricata
detect/krb5: move krb5_msg_type to rust
Makes it a generic u32 on the way Unit tests are covered by SV tests Ticket: 6723pull/13892/head
Philippe Antoine
1 year ago
committed by
Victor Julien
parent
5a4d280461
commit
0553dfa814
@ -1,243 +0,0 @@
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/* Copyright (C) 2018-2020 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 Pierre Chifflier <chifflier@wzdftpd.net>
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*/
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#include "suricata-common.h"
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#include "util-unittest.h"
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#include "util-byte.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-krb5-msgtype.h"
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#include "rust.h"
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/**
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* \brief Regex for parsing our keyword options
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*/
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#define PARSE_REGEX "^\\s*([A-z0-9\\.]+|\"[A-z0-9_\\.]+\")\\s*$"
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static DetectParseRegex parse_regex;
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/* Prototypes of functions registered in DetectKrb5MsgTypeRegister below */
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static int DetectKrb5MsgTypeMatch (DetectEngineThreadCtx *, Flow *,
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uint8_t, void *, void *, const Signature *,
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const SigMatchCtx *);
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static int DetectKrb5MsgTypeSetup (DetectEngineCtx *, Signature *, const char *);
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static void DetectKrb5MsgTypeFree (DetectEngineCtx *, void *);
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#ifdef UNITTESTS
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static void DetectKrb5MsgTypeRegisterTests (void);
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#endif
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static int g_krb5_msg_type_list_id = 0;
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/**
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* \brief Registration function for krb5_msg_type: keyword
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*
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* This function is called once in the 'lifetime' of the engine.
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*/
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void DetectKrb5MsgTypeRegister(void)
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{
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sigmatch_table[DETECT_KRB5_MSGTYPE].name = "krb5_msg_type";
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sigmatch_table[DETECT_KRB5_MSGTYPE].desc = "match Kerberos 5 message type";
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sigmatch_table[DETECT_KRB5_MSGTYPE].url = "/rules/kerberos-keywords.html#krb5-msg-type";
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sigmatch_table[DETECT_KRB5_MSGTYPE].Match = NULL;
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sigmatch_table[DETECT_KRB5_MSGTYPE].AppLayerTxMatch = DetectKrb5MsgTypeMatch;
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sigmatch_table[DETECT_KRB5_MSGTYPE].Setup = DetectKrb5MsgTypeSetup;
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sigmatch_table[DETECT_KRB5_MSGTYPE].Free = DetectKrb5MsgTypeFree;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_KRB5_MSGTYPE].RegisterTests = DetectKrb5MsgTypeRegisterTests;
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#endif
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DetectAppLayerInspectEngineRegister("krb5_msg_type", ALPROTO_KRB5, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister("krb5_msg_type", ALPROTO_KRB5, SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectGenericList, NULL);
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/* set up the PCRE for keyword parsing */
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DetectSetupParseRegexes(PARSE_REGEX, &parse_regex);
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g_krb5_msg_type_list_id = DetectBufferTypeRegister("krb5_msg_type");
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SCLogDebug("g_krb5_msg_type_list_id %d", g_krb5_msg_type_list_id);
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}
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/**
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* \brief This function is used to match KRB5 rule option on a packet
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*
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* \param t pointer to thread vars
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* \param det_ctx pointer to the pattern matcher thread
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* \param p pointer to the current packet
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* \param m pointer to the sigmatch with context that we will cast into DetectKrb5Data
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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 DetectKrb5MsgTypeMatch (DetectEngineThreadCtx *det_ctx,
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Flow *f, uint8_t flags, void *state,
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void *txv, const Signature *s,
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const SigMatchCtx *ctx)
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{
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uint32_t msg_type;
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const DetectKrb5MsgTypeData *dd = (const DetectKrb5MsgTypeData *)ctx;
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SCEnter();
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SCKrb5TxGetMsgType(txv, &msg_type);
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if (dd->msg_type == msg_type)
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SCReturnInt(1);
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SCReturnInt(0);
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}
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/**
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* \brief This function is used to parse options passed via krb5_msgtype: keyword
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*
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* \param krb5str Pointer to the user provided krb5_msg_type options
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*
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* \retval krb5d pointer to DetectKrb5Data on success
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* \retval NULL on failure
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*/
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static DetectKrb5MsgTypeData *DetectKrb5MsgTypeParse (const char *krb5str)
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{
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DetectKrb5MsgTypeData *krb5d = NULL;
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char arg1[4] = "";
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int res = 0;
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size_t pcre2len;
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pcre2_match_data *match = NULL;
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int ret = DetectParsePcreExec(&parse_regex, &match, krb5str, 0, 0);
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if (ret != 2) {
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SCLogError("parse error, ret %" PRId32 "", ret);
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goto error;
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}
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pcre2len = sizeof(arg1);
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res = pcre2_substring_copy_bynumber(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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goto error;
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}
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krb5d = SCMalloc(sizeof (DetectKrb5MsgTypeData));
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if (unlikely(krb5d == NULL))
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goto error;
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if (StringParseUint8(&krb5d->msg_type, 10, 0,
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(const char *)arg1) < 0) {
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goto error;
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}
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pcre2_match_data_free(match);
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return krb5d;
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error:
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if (match) {
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pcre2_match_data_free(match);
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}
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if (krb5d)
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SCFree(krb5d);
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return NULL;
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}
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/**
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* \brief parse the options from the 'krb5_msg_type' keyword in the rule into
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* the Signature data structure.
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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 krb5str pointer to the user provided 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 DetectKrb5MsgTypeSetup (DetectEngineCtx *de_ctx, Signature *s, const char *krb5str)
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{
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DetectKrb5MsgTypeData *krb5d = NULL;
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if (SCDetectSignatureSetAppProto(s, ALPROTO_KRB5) != 0)
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return -1;
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krb5d = DetectKrb5MsgTypeParse(krb5str);
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if (krb5d == NULL)
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goto error;
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if (SCSigMatchAppendSMToList(de_ctx, s, DETECT_KRB5_MSGTYPE, (SigMatchCtx *)krb5d,
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g_krb5_msg_type_list_id) == NULL) {
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goto error;
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}
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return 0;
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error:
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if (krb5d != NULL)
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DetectKrb5MsgTypeFree(de_ctx, krb5d);
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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 DetectKrb5Data
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*
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* \param ptr pointer to DetectKrb5Data
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*/
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static void DetectKrb5MsgTypeFree(DetectEngineCtx *de_ctx, void *ptr) {
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DetectKrb5MsgTypeData *krb5d = (DetectKrb5MsgTypeData *)ptr;
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SCFree(krb5d);
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}
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#ifdef UNITTESTS
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/**
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* \test description of the test
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*/
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static int DetectKrb5MsgTypeParseTest01 (void)
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{
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DetectKrb5MsgTypeData *krb5d = DetectKrb5MsgTypeParse("10");
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FAIL_IF_NULL(krb5d);
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FAIL_IF(!(krb5d->msg_type == 10));
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DetectKrb5MsgTypeFree(NULL, krb5d);
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PASS;
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}
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static int DetectKrb5MsgTypeSignatureTest01 (void)
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{
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DetectEngineCtx *de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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Signature *sig = DetectEngineAppendSig(de_ctx, "alert krb5 any any -> any any (krb5_msg_type:10; sid:1; rev:1;)");
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FAIL_IF_NULL(sig);
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DetectEngineCtxFree(de_ctx);
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PASS;
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}
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/**
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* \brief this function registers unit tests for DetectKrb5MsgType
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*/
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static void DetectKrb5MsgTypeRegisterTests(void)
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{
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UtRegisterTest("DetectKrb5MsgTypeParseTest01", DetectKrb5MsgTypeParseTest01);
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UtRegisterTest("DetectKrb5MsgTypeSignatureTest01",
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DetectKrb5MsgTypeSignatureTest01);
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}
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#endif /* UNITTESTS */
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@ -1,33 +0,0 @@
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/* Copyright (C) 2015-2017 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 Pierre Chifflier <chifflier@wzdftpd.net>
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*/
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#ifndef SURICATA_DETECT_KRB5_MSGTYPE_H
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#define SURICATA_DETECT_KRB5_MSGTYPE_H
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typedef struct DetectKrb5MsgTypeData_ {
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uint8_t msg_type;
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} DetectKrb5MsgTypeData;
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void DetectKrb5MsgTypeRegister(void);
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#endif /* SURICATA_DETECT_KRB5_MSGTYPE_H */
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