mirror of https://github.com/OISF/suricata
detect/krb5: move krb5_err_code to rust
Ticket: 8648 Make it a generic integer on the waypull/15726/head
Philippe Antoine
2 months ago
committed by
Victor Julien
parent
e560db9d1f
commit
3327cf42f0
@ -1,245 +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-errcode.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 DetectKrb5ErrCodeRegister below */
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static int DetectKrb5ErrCodeMatch (DetectEngineThreadCtx *, Flow *,
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uint8_t, void *, void *, const Signature *,
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const SigMatchCtx *);
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static int DetectKrb5ErrCodeSetup (DetectEngineCtx *, Signature *, const char *);
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static void DetectKrb5ErrCodeFree (DetectEngineCtx *, void *);
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#ifdef UNITTESTS
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static void DetectKrb5ErrCodeRegisterTests (void);
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#endif
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static int g_krb5_err_code_list_id = 0;
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/**
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* \brief Registration function for krb5_err_code: 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 DetectKrb5ErrCodeRegister(void)
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{
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sigmatch_table[DETECT_KRB5_ERRCODE].name = "krb5_err_code";
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sigmatch_table[DETECT_KRB5_ERRCODE].desc = "match Kerberos 5 error code";
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sigmatch_table[DETECT_KRB5_ERRCODE].url = "/rules/kerberos-keywords.html#krb5-err-code";
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sigmatch_table[DETECT_KRB5_ERRCODE].Match = NULL;
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sigmatch_table[DETECT_KRB5_ERRCODE].AppLayerTxMatch = DetectKrb5ErrCodeMatch;
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sigmatch_table[DETECT_KRB5_ERRCODE].Setup = DetectKrb5ErrCodeSetup;
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sigmatch_table[DETECT_KRB5_ERRCODE].Free = DetectKrb5ErrCodeFree;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_KRB5_ERRCODE].RegisterTests = DetectKrb5ErrCodeRegisterTests;
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#endif
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DetectAppLayerInspectEngineRegister("krb5_err_code", ALPROTO_KRB5, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister("krb5_err_code", 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_err_code_list_id = DetectBufferTypeRegister("krb5_err_code");
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SCLogDebug("g_krb5_err_code_list_id %d", g_krb5_err_code_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 DetectKrb5ErrCodeMatch (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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int32_t err_code;
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int ret;
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const DetectKrb5ErrCodeData *dd = (const DetectKrb5ErrCodeData *)ctx;
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SCEnter();
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ret = SCKrb5TxGetErrorCode(txv, &err_code);
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if (ret != 0)
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SCReturnInt(0);
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if (dd->err_code == err_code)
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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_errcode: keyword
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*
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* \param krb5str Pointer to the user provided krb5_err_code 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 DetectKrb5ErrCodeData *DetectKrb5ErrCodeParse (const char *krb5str)
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{
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DetectKrb5ErrCodeData *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 (DetectKrb5ErrCodeData));
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if (unlikely(krb5d == NULL))
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goto error;
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if (StringParseInt32(&krb5d->err_code, 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_err_code' 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 DetectKrb5ErrCodeSetup (DetectEngineCtx *de_ctx, Signature *s, const char *krb5str)
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{
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DetectKrb5ErrCodeData *krb5d = NULL;
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if (SCDetectSignatureSetAppProto(s, ALPROTO_KRB5) != 0)
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return -1;
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krb5d = DetectKrb5ErrCodeParse(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_ERRCODE, (SigMatchCtx *)krb5d,
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g_krb5_err_code_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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DetectKrb5ErrCodeFree(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 DetectKrb5ErrCodeFree(DetectEngineCtx *de_ctx, void *ptr) {
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DetectKrb5ErrCodeData *krb5d = (DetectKrb5ErrCodeData *)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 DetectKrb5ErrCodeParseTest01 (void)
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{
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DetectKrb5ErrCodeData *krb5d = DetectKrb5ErrCodeParse("10");
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FAIL_IF_NULL(krb5d);
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FAIL_IF(!(krb5d->err_code == 10));
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DetectKrb5ErrCodeFree(NULL, krb5d);
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PASS;
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}
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static int DetectKrb5ErrCodeSignatureTest01 (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_err_code: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 DetectKrb5ErrCode
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*/
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static void DetectKrb5ErrCodeRegisterTests(void)
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{
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UtRegisterTest("DetectKrb5ErrCodeParseTest01", DetectKrb5ErrCodeParseTest01);
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UtRegisterTest("DetectKrb5ErrCodeSignatureTest01",
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DetectKrb5ErrCodeSignatureTest01);
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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_ERRCODE_H
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#define SURICATA_DETECT_KRB5_ERRCODE_H
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typedef struct DetectKrb5ErrCodeData_ {
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int32_t err_code;
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} DetectKrb5ErrCodeData;
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void DetectKrb5ErrCodeRegister(void);
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#endif /* SURICATA_DETECT_KRB5_ERRCODE_H */
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