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base64_decode, base64_data: decode and match base64

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pull/1758/head
Jason Ish 10 years ago committed by Victor Julien
parent 9375e8fb3c
commit 6b15686fd1
13 changed files with 1142 additions and 3 deletions
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2
src/Makefile.am
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@ -71,6 +71,8 @@ detect-ack.c detect-ack.h \
detect-app-layer-event.c detect-app-layer-event.h \
detect-app-layer-protocol.c detect-app-layer-protocol.h \
detect-asn1.c detect-asn1.h \
detect-base64-data.c detect-base64-data.h \
detect-base64-decode.c detect-base64-decode.h \
detect-byte-extract.c detect-byte-extract.h \
detect-bytejump.c detect-bytejump.h \
detect-bytetest.c detect-bytetest.h \

236
src/detect-base64-data.c
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@ -0,0 +1,236 @@
/* Copyright (C) 2015 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.
*/
#include "suricata-common.h"
#include "detect.h"
#include "detect-engine-content-inspection.h"
#include "detect-parse.h"
#include "util-unittest.h"
static int DetectBase64DataSetup(DetectEngineCtx *, Signature *, char *);
static void DetectBase64DataRegisterTests(void);
void DetectBase64DataRegister(void)
{
sigmatch_table[DETECT_BASE64_DATA].name = "base64_data";
sigmatch_table[DETECT_BASE64_DATA].desc =
"Content match base64 decoded data.";
sigmatch_table[DETECT_BASE64_DATA].url =
"https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Payload_keywords#base64_data";
sigmatch_table[DETECT_BASE64_DATA].Setup = DetectBase64DataSetup;
sigmatch_table[DETECT_BASE64_DATA].RegisterTests =
DetectBase64DataRegisterTests;
sigmatch_table[DETECT_BASE64_DATA].flags |= SIGMATCH_NOOPT;
}
static int DetectBase64DataSetup(DetectEngineCtx *de_ctx, Signature *s,
char *str)
{
SigMatch *pm = NULL;
/* Check for a preceding base64_decode. */
pm = SigMatchGetLastSMFromLists(s, 28,
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_BASE64_DECODE, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH]);
if (pm == NULL) {
SCLogError(SC_ERR_INVALID_SIGNATURE,
"\"base64_data\" keyword seen without preceding base64_decode.");
return -1;
}
s->list = DETECT_SM_LIST_BASE64_DATA;
return 0;
}
int DetectBase64DataDoMatch(DetectEngineCtx *de_ctx,
DetectEngineThreadCtx *det_ctx, Signature *s, Flow *f)
{
if (det_ctx->base64_decoded_len) {
return DetectEngineContentInspection(de_ctx, det_ctx, s,
s->sm_lists[DETECT_SM_LIST_BASE64_DATA], f, det_ctx->base64_decoded,
det_ctx->base64_decoded_len, 0,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_BASE64, NULL);
}
return 0;
}
#ifdef UNITTESTS
#include "detect-engine.h"
static int DetectBase64DataSetupTest01(void)
{
DetectEngineCtx *de_ctx = NULL;
SigMatch *sm;
int retval = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert smtp any any -> any any (msg:\"DetectBase64DataSetupTest\"; "
"base64_decode; base64_data; content:\"content\"; sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
printf("SigInit failed: ");
goto end;
}
sm = de_ctx->sig_list->sm_lists[DETECT_SM_LIST_PMATCH];
if (sm == NULL) {
printf("DETECT_SM_LIST_PMATCH should not be NULL: ");
goto end;
}
if (sm->type != DETECT_BASE64_DECODE) {
printf("sm->type should be DETECT_BASE64_DECODE: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_BASE64_DATA] == NULL) {
printf("DETECT_SM_LIST_BASE64_DATA should not be NULL: ");
goto end;
}
retval = 1;
end:
if (de_ctx != NULL) {
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
}
return retval;
}
static int DetectBase64DataSetupTest02(void)
{
DetectEngineCtx *de_ctx = NULL;
SigMatch *sm;
int retval = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert smtp any any -> any any ( "
"msg:\"DetectBase64DataSetupTest\"; "
"file_data; "
"content:\"SGV\"; "
"base64_decode: bytes 16; "
"base64_data; "
"content:\"content\"; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
printf("SigInit failed: ");
goto end;
}
sm = de_ctx->sig_list->sm_lists[DETECT_SM_LIST_PMATCH];
if (sm != NULL) {
printf("DETECT_SM_LIST_PMATCH is not NULL: ");
goto end;
}
sm = de_ctx->sig_list->sm_lists[DETECT_SM_LIST_FILEDATA];
if (sm == NULL) {
printf("DETECT_SM_LIST_FILEDATA is NULL: ");
goto end;
}
sm = de_ctx->sig_list->sm_lists[DETECT_SM_LIST_BASE64_DATA];
if (sm == NULL) {
printf("DETECT_SM_LIST_BASE64_DATA is NULL: ");
goto end;
}
retval = 1;
end:
if (de_ctx != NULL) {
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
}
return retval;
}
static int DetectBase64DataSetupTest03(void)
{
DetectEngineCtx *de_ctx = NULL;
int retval = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert smtp any any -> any any ( "
"msg:\"DetectBase64DataSetupTest\"; "
"base64_decode: bytes 16; "
"base64_data; "
"content:\"content\"; "
"file_data; "
"content:\"SGV\"; "
"sid:1; rev:1;)");
if (de_ctx->sig_list != NULL) {
printf("SigInit should have failed: ");
goto end;
}
retval = 1;
end:
if (de_ctx != NULL) {
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
}
return retval;
}
#endif
static void DetectBase64DataRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DetectBase64DataSetupTest01", DetectBase64DataSetupTest01,
1);
UtRegisterTest("DetectBase64DataSetupTest02", DetectBase64DataSetupTest02,
1);
UtRegisterTest("DetectBase64DataSetupTest03", DetectBase64DataSetupTest03,
1);
#endif /* UNITTESTS */
}

25
src/detect-base64-data.h
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@ -0,0 +1,25 @@
/* Copyright (C) 2015 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.
*/
#ifndef __DETECT_BASE64_DATA_H__
#define __DETECT_BASE64_DATA_H__
void DetectBase64DataRegister(void);
int DetectBase64DataDoMatch(DetectEngineCtx *, DetectEngineThreadCtx *,
Signature *, Flow *);
#endif /* __DETECT_BASE64_DATA_H__ */

778
src/detect-base64-decode.c
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@ -0,0 +1,778 @@
/* Copyright (C) 2015 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.
*/
#include "suricata-common.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-base64-decode.h"
#include "util-base64.h"
#include "util-byte.h"
#include "util-print.h"
/* Arbitrary maximum buffer size for decoded base64 data. */
#define BASE64_DECODE_MAX 65535
static const char decode_pattern[] = "\\s*(bytes\\s+(\\d+),?)?"
"\\s*(offset\\s+(\\d+),?)?"
"\\s*(\\w+)?";
static pcre *decode_pcre = NULL;
static pcre_extra *decode_pcre_study = NULL;
static int DetectBase64DecodeSetup(DetectEngineCtx *, Signature *, char *);
static void DetectBase64DecodeFree(void *);
static void DetectBase64DecodeRegisterTests(void);
void DetectBase64DecodeRegister(void)
{
const char *pcre_errptr;
int pcre_erroffset;
sigmatch_table[DETECT_BASE64_DECODE].name = "base64_decode";
sigmatch_table[DETECT_BASE64_DECODE].desc =
"Decodes base64 encoded data.";
sigmatch_table[DETECT_BASE64_DECODE].url =
"https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Payload_keywords#base64_decode";
sigmatch_table[DETECT_BASE64_DECODE].Setup = DetectBase64DecodeSetup;
sigmatch_table[DETECT_BASE64_DECODE].Free = DetectBase64DecodeFree;
sigmatch_table[DETECT_BASE64_DECODE].RegisterTests =
DetectBase64DecodeRegisterTests;
sigmatch_table[DETECT_BASE64_DECODE].flags |= SIGMATCH_PAYLOAD;
sigmatch_table[DETECT_BASE64_DECODE].flags |= SIGMATCH_OPTIONAL_OPT;
decode_pcre = pcre_compile(decode_pattern, 0, &pcre_errptr, &pcre_erroffset,
NULL);
if (decode_pcre == NULL) {
SCLogError(SC_ERR_PCRE_COMPILE, "Failed to compile pattern \"%s\" at"
" offset %d: %s", decode_pattern, pcre_erroffset, pcre_errptr);
exit(EXIT_FAILURE);
}
decode_pcre_study = pcre_study(decode_pcre, 0, &pcre_errptr);
if (pcre_errptr != NULL) {
SCLogError(SC_ERR_PCRE_STUDY, "Failed to study pattern \"%s\": %s",
decode_pattern, pcre_errptr);
exit(EXIT_FAILURE);
}
}
int DetectBase64DecodeDoMatch(DetectEngineThreadCtx *det_ctx, Signature *s,
const SigMatch *sm, uint8_t *payload, uint32_t payload_len)
{
DetectBase64Decode *data = (DetectBase64Decode *)sm->ctx;
int decode_len;
#if 0
printf("Input data:\n");
PrintRawDataFp(stdout, payload, payload_len);
#endif
if (data->relative) {
payload += det_ctx->buffer_offset;
payload_len -= det_ctx->buffer_offset;
}
if (data->offset) {
if (data->offset >= payload_len) {
return 0;
}
payload = payload + data->offset;
payload_len -= data->offset;
}
decode_len = MIN(payload_len, data->bytes);
#if 0
printf("Decoding:\n");
PrintRawDataFp(stdout, payload, decode_len);
#endif
det_ctx->base64_decoded_len = DecodeBase64(det_ctx->base64_decoded,
payload, decode_len, 0);
SCLogDebug("Decoded %d bytes from base64 data.",
det_ctx->base64_decoded_len);
#if 0
if (det_ctx->base64_decoded_len) {
printf("Decoded data:\n");
PrintRawDataFp(stdout, det_ctx->base64_decoded,
det_ctx->base64_decoded_len);
}
#endif
return det_ctx->base64_decoded_len > 0;
}
static int DetectBase64DecodeParse(const char *str, uint32_t *bytes,
uint32_t *offset, uint8_t *relative)
{
static const int max = 30;
int ov[max];
int pcre_rc;
const char *bytes_str = NULL;
const char *offset_str = NULL;
const char *relative_str = NULL;
int retval = 0;
*bytes = 0;
*offset = 0;
*relative = 0;
pcre_rc = pcre_exec(decode_pcre, decode_pcre_study, str, strlen(str), 0, 0,
ov, max);
if (pcre_rc < 3) {
goto error;
}
if (pcre_rc >= 3) {
if (pcre_get_substring((char *)str, ov, max, 2, &bytes_str) > 0) {
if (ByteExtractStringUint32(bytes, 10, 0, bytes_str) <= 0) {
SCLogError(SC_ERR_INVALID_RULE_ARGUMENT,
"Bad value for bytes: \"%s\"", bytes_str);
goto error;
}
}
}
if (pcre_rc >= 5) {
if (pcre_get_substring((char *)str, ov, max, 4, &offset_str)) {
if (ByteExtractStringUint32(offset, 10, 0, offset_str) <= 0) {
SCLogError(SC_ERR_INVALID_RULE_ARGUMENT,
"Bad value for offset: \"%s\"", offset_str);
goto error;
}
}
}
if (pcre_rc >= 6) {
if (pcre_get_substring((char *)str, ov, max, 5, &relative_str)) {
if (strcmp(relative_str, "relative") == 0) {
*relative = 1;
}
else {
SCLogError(SC_ERR_INVALID_RULE_ARGUMENT,
"Invalid argument: \"%s\"", relative_str);
goto error;
}
}
}
retval = 1;
error:
if (bytes_str != NULL) {
pcre_free_substring(bytes_str);
}
if (offset_str != NULL) {
pcre_free_substring(offset_str);
}
if (relative_str != NULL) {
pcre_free_substring(relative_str);
}
return retval;
}
static int DetectBase64DecodeSetup(DetectEngineCtx *de_ctx, Signature *s,
char *str)
{
uint32_t bytes = 0;
uint32_t offset = 0;
uint8_t relative = 0;
DetectBase64Decode *data = NULL;
int sm_list;
SigMatch *sm = NULL;
SigMatch *pm = NULL;
if (str != NULL) {
if (!DetectBase64DecodeParse(str, &bytes, &offset, &relative)) {
goto error;
}
}
data = SCCalloc(1, sizeof(DetectBase64Decode));
if (unlikely(data == NULL)) {
goto error;
}
data->bytes = bytes;
data->offset = offset;
data->relative = relative;
if (s->list != DETECT_SM_LIST_NOTSET) {
sm_list = s->list;
#if 0
if (data->relative) {
pm = SigMatchGetLastSMFromLists(s, 4,
DETECT_CONTENT, s->sm_lists_tail[sm_list],
DETECT_PCRE, s->sm_lists_tail[sm_list]);
}
#endif
}
else {
/* Copied from detect-isdataat.c. */
pm = SigMatchGetLastSMFromLists(s, 168,
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_PCRE, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_BYTETEST, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_BYTEJUMP, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_BYTE_EXTRACT, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
DETECT_ISDATAAT, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH]);
if (pm == NULL) {
sm_list = DETECT_SM_LIST_PMATCH;
}
else {
sm_list = SigMatchListSMBelongsTo(s, pm);
}
}
sm = SigMatchAlloc();
if (sm == NULL) {
goto error;
}
sm->type = DETECT_BASE64_DECODE;
sm->ctx = (SigMatchCtx *)data;
SigMatchAppendSMToList(s, sm, sm_list);
if (!data->bytes) {
data->bytes = BASE64_DECODE_MAX;
}
if (data->bytes > de_ctx->base64_decode_max_len) {
de_ctx->base64_decode_max_len = data->bytes;
}
return 0;
error:
if (data != NULL) {
SCFree(data);
}
return -1;
}
static void DetectBase64DecodeFree(void *ptr)
{
DetectBase64Decode *data = ptr;
SCFree(data);
}
#ifdef UNITTESTS
#include "detect.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "app-layer-parser.h"
#include "flow-util.h"
#include "stream-tcp.h"
static int DetectBase64TestDecodeParse(void)
{
int retval = 0;
uint32_t bytes = 0;
uint32_t offset = 0;
uint8_t relative = 0;
if (!DetectBase64DecodeParse("bytes 1", &bytes, &offset, &relative)) {
goto end;
}
if (bytes != 1 || offset != 0 || relative != 0) {
goto end;
}
if (!DetectBase64DecodeParse("offset 9", &bytes, &offset, &relative)) {
goto end;
}
if (bytes != 0 || offset != 9 || relative != 0) {
goto end;
}
if (!DetectBase64DecodeParse("relative", &bytes, &offset, &relative)) {
goto end;
}
if (bytes != 0 || offset != 0 || relative != 1) {
goto end;
}
if (!DetectBase64DecodeParse("bytes 1, offset 2", &bytes, &offset,
&relative)) {
goto end;
}
if (bytes != 1 || offset != 2 || relative != 0) {
goto end;
}
if (!DetectBase64DecodeParse("bytes 1, offset 2, relative", &bytes, &offset,
&relative)) {
goto end;
}
if (bytes != 1 || offset != 2 || relative != 1) {
goto end;
}
if (!DetectBase64DecodeParse("offset 2, relative", &bytes, &offset,
&relative)) {
goto end;
}
if (bytes != 0 || offset != 2 || relative != 1) {
goto end;
}
/* Misspelled relative. */
if (DetectBase64DecodeParse("bytes 1, offset 2, relatve", &bytes, &offset,
&relative)) {
goto end;
}
/* Misspelled bytes. */
if (DetectBase64DecodeParse("byts 1, offset 2, relatve", &bytes, &offset,
&relative)) {
goto end;
}
/* Misspelled offset. */
if (DetectBase64DecodeParse("bytes 1, offst 2, relatve", &bytes, &offset,
&relative)) {
goto end;
}
/* Misspelled empty string. */
if (DetectBase64DecodeParse("", &bytes, &offset, &relative)) {
goto end;
}
retval = 1;
end:
return retval;
}
/**
* Test keyword setup on basic content.
*/
static int DetectBase64DecodeTestSetup(void)
{
DetectEngineCtx *de_ctx = NULL;
Signature *s;
int retval = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any ("
"msg:\"DetectBase64DecodeTestSetup\"; "
"base64_decode; content:\"content\"; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
s = de_ctx->sig_list;
if (s == NULL) {
goto end;
}
if (s->sm_lists_tail[DETECT_SM_LIST_PMATCH] == NULL) {
goto end;
}
retval = 1;
end:
if (de_ctx != NULL) {
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
}
return retval;
}
/**
* Test keyword setup when the prior rule has a content modifier on
* it.
*/
static int DetectBase64DecodeHttpHeaderTestSetup(void)
{
DetectEngineCtx *de_ctx = NULL;
Signature *s;
int retval = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any ("
"msg:\"DetectBase64DecodeTestSetup\"; "
"content:\"Authorization: basic \"; http_header; "
"base64_decode; content:\"content\"; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
s = de_ctx->sig_list;
if (s == NULL) {
goto end;
}
/* I'm not complete sure if this list should not be NULL. */
if (s->sm_lists_tail[DETECT_SM_LIST_PMATCH] == NULL) {
goto end;
}
/* Test that the http header list is not NULL. */
if (s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH] == NULL) {
goto end;
}
retval = 1;
end:
if (de_ctx != NULL) {
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
}
return retval;
}
static int DetectBase64DecodeTestDecode(void)
{
ThreadVars tv;
DetectEngineCtx *de_ctx = NULL;
DetectEngineThreadCtx *det_ctx = NULL;
Packet *p = NULL;
int retval = 0;
uint8_t payload[] = {
'S', 'G', 'V', 's', 'b', 'G', '8', 'g',
'V', '2', '9', 'y', 'b', 'G', 'Q', '=',
};
memset(&tv, 0, sizeof(tv));
if ((de_ctx = DetectEngineCtxInit()) == NULL) {
goto end;
}
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any (msg:\"base64 test\"; "
"base64_decode; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
p = UTHBuildPacket(payload, sizeof(payload), IPPROTO_TCP);
if (p == NULL) {
goto end;
}
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
if (det_ctx->base64_decoded_len == 0) {
goto end;
}
retval = 1;
end:
if (det_ctx != NULL) {
DetectEngineThreadCtxDeinit(&tv, det_ctx);
}
if (de_ctx != NULL) {
SigCleanSignatures(de_ctx);
SigGroupCleanup(de_ctx);
DetectEngineCtxFree(de_ctx);
}
if (p != NULL) {
UTHFreePacket(p);
}
return retval;
}
static int DetectBase64DecodeTestDecodeWithOffset(void)
{
ThreadVars tv;
DetectEngineCtx *de_ctx = NULL;
DetectEngineThreadCtx *det_ctx = NULL;
Packet *p = NULL;
int retval = 0;
uint8_t payload[] = {
'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
'S', 'G', 'V', 's', 'b', 'G', '8', 'g',
'V', '2', '9', 'y', 'b', 'G', 'Q', '=',
};
char decoded[] = "Hello World";
memset(&tv, 0, sizeof(tv));
if ((de_ctx = DetectEngineCtxInit()) == NULL) {
goto end;
}
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any (msg:\"base64 test\"; "
"base64_decode: offset 8; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
p = UTHBuildPacket(payload, sizeof(payload), IPPROTO_TCP);
if (p == NULL) {
goto end;
}
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
if (det_ctx->base64_decoded_len != (int)strlen(decoded)) {
goto end;
}
if (memcmp(det_ctx->base64_decoded, decoded, strlen(decoded))) {
goto end;
}
retval = 1;
end:
if (det_ctx != NULL) {
DetectEngineThreadCtxDeinit(&tv, det_ctx);
}
if (de_ctx != NULL) {
SigCleanSignatures(de_ctx);
SigGroupCleanup(de_ctx);
DetectEngineCtxFree(de_ctx);
}
if (p != NULL) {
UTHFreePacket(p);
}
return retval;
}
static int DetectBase64DecodeTestDecodeLargeOffset(void)
{
ThreadVars tv;
DetectEngineCtx *de_ctx = NULL;
DetectEngineThreadCtx *det_ctx = NULL;
Packet *p = NULL;
int retval = 0;
uint8_t payload[] = {
'S', 'G', 'V', 's', 'b', 'G', '8', 'g',
'V', '2', '9', 'y', 'b', 'G', 'Q', '=',
};
memset(&tv, 0, sizeof(tv));
if ((de_ctx = DetectEngineCtxInit()) == NULL) {
goto end;
}
/* Offset is out of range. */
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any (msg:\"base64 test\"; "
"base64_decode: bytes 16, offset 32; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
p = UTHBuildPacket(payload, sizeof(payload), IPPROTO_TCP);
if (p == NULL) {
goto end;
}
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
if (det_ctx->base64_decoded_len != 0) {
goto end;
}
retval = 1;
end:
if (det_ctx != NULL) {
DetectEngineThreadCtxDeinit(&tv, det_ctx);
}
if (de_ctx != NULL) {
SigCleanSignatures(de_ctx);
SigGroupCleanup(de_ctx);
DetectEngineCtxFree(de_ctx);
}
if (p != NULL) {
UTHFreePacket(p);
}
return retval;
}
static int DetectBase64DecodeTestDecodeRelative(void)
{
ThreadVars tv;
DetectEngineCtx *de_ctx = NULL;
DetectEngineThreadCtx *det_ctx = NULL;
Packet *p = NULL;
int retval = 0;
uint8_t payload[] = {
'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
'S', 'G', 'V', 's', 'b', 'G', '8', 'g',
'V', '2', '9', 'y', 'b', 'G', 'Q', '=',
};
char decoded[] = "Hello World";
memset(&tv, 0, sizeof(tv));
if ((de_ctx = DetectEngineCtxInit()) == NULL) {
goto end;
}
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any (msg:\"base64 test\"; "
"content:\"aaaaaaaa\"; "
"base64_decode: relative; "
"sid:1; rev:1;)");
if (de_ctx->sig_list == NULL) {
goto end;
}
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
p = UTHBuildPacket(payload, sizeof(payload), IPPROTO_TCP);
if (p == NULL) {
goto end;
}
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
if (det_ctx->base64_decoded_len != (int)strlen(decoded)) {
goto end;
}
if (memcmp(det_ctx->base64_decoded, decoded, strlen(decoded))) {
goto end;
}
retval = 1;
end:
if (det_ctx != NULL) {
DetectEngineThreadCtxDeinit(&tv, det_ctx);
}
if (de_ctx != NULL) {
SigCleanSignatures(de_ctx);
SigGroupCleanup(de_ctx);
DetectEngineCtxFree(de_ctx);
}
if (p != NULL) {
UTHFreePacket(p);
}
return retval;
}
#endif
static void DetectBase64DecodeRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DetectBase64TestDecodeParse", DetectBase64TestDecodeParse,
1);
UtRegisterTest("DetectBase64DecodeTestSetup", DetectBase64DecodeTestSetup,
1);
UtRegisterTest("DetectBase64DecodeHttpHeaderTestSetup",
DetectBase64DecodeHttpHeaderTestSetup, 1);
UtRegisterTest("DetectBase64DecodeTestDecode", DetectBase64DecodeTestDecode,
1);
UtRegisterTest("DetectBase64DecodeTestDecodeWithOffset",
DetectBase64DecodeTestDecodeWithOffset, 1);
UtRegisterTest("DetectBase64DecodeTestDecodeLargeOffset",
DetectBase64DecodeTestDecodeLargeOffset, 1);
UtRegisterTest("DetectBase64DecodeTestDecodeRelative",
DetectBase64DecodeTestDecodeRelative, 1);
#endif /* UNITTESTS */
}

33
src/detect-base64-decode.h
Unescape Escape View File

@ -0,0 +1,33 @@
/* Copyright (C) 2015 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.
*/
#ifndef __DETECT_BASE64_DECODE_H__
#define __DETECT_BASE64_DECODE_H__
#include "app-layer-template.h"
typedef struct DetectBase64Decode_ {
uint32_t bytes;
uint32_t offset;
uint8_t relative;
} DetectBase64Decode;
void DetectBase64DecodeRegister(void);
int DetectBase64DecodeDoMatch(DetectEngineThreadCtx *, Signature *,
const SigMatch *, uint8_t *, uint32_t);
#endif /* __DETECT_BASE64_DECODE_H__ */

18
src/detect-engine-content-inspection.c
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@ -42,6 +42,8 @@
#include "detect-uricontent.h"
#include "detect-urilen.h"
#include "detect-lua.h"
#include "detect-base64-decode.h"
#include "detect-base64-data.h"
#include "app-layer-dcerpc.h"
@ -551,6 +553,16 @@ int DetectEngineContentInspection(DetectEngineCtx *de_ctx, DetectEngineThreadCtx
SCLogDebug("lua match");
goto match;
#endif /* HAVE_LUA */
} else if (sm->type == DETECT_BASE64_DECODE) {
if (DetectBase64DecodeDoMatch(det_ctx, s, sm, buffer, buffer_len)) {
if (s->sm_arrays[DETECT_SM_LIST_BASE64_DATA] != NULL) {
KEYWORD_PROFILING_END(det_ctx, sm->type, 1);
if (DetectBase64DataDoMatch(de_ctx, det_ctx, s, f)) {
/* Base64 is a terminal list. */
goto final_match;
}
}
}
} else {
SCLogDebug("sm->type %u", sm->type);
#ifdef DEBUG
@ -569,8 +581,8 @@ match:
KEYWORD_PROFILING_END(det_ctx, sm->type, 1);
int r = DetectEngineContentInspection(de_ctx, det_ctx, s, sm->next, f, buffer, buffer_len, stream_start_offset, inspection_mode, data);
SCReturnInt(r);
} else {
KEYWORD_PROFILING_END(det_ctx, sm->type, 1);
SCReturnInt(1);
}
final_match:
KEYWORD_PROFILING_END(det_ctx, sm->type, 1);
SCReturnInt(1);
}

1
src/detect-engine-content-inspection.h
Unescape Escape View File

@ -50,6 +50,7 @@ enum {
DETECT_ENGINE_CONTENT_INSPECTION_MODE_HRHHD,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_DNSQUERY,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_FD_SMTP,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_BASE64,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_TEMPLATE_BUFFER,
};

18
src/detect-engine.c
Unescape Escape View File

@ -1338,6 +1338,16 @@ static TmEcode ThreadCtxDoInit (DetectEngineCtx *de_ctx, DetectEngineThreadCtx *
return TM_ECODE_FAILED;
}
/* Allocate space for base64 decoded data. */
if (de_ctx->base64_decode_max_len) {
det_ctx->base64_decoded = SCMalloc(de_ctx->base64_decode_max_len);
if (det_ctx->base64_decoded == NULL) {
return TM_ECODE_FAILED;
}
det_ctx->base64_decoded_len_max = de_ctx->base64_decode_max_len;
det_ctx->base64_decoded_len = 0;
}
DetectEngineThreadCtxInitKeywords(de_ctx, det_ctx);
#ifdef PROFILING
SCProfilingRuleThreadSetup(de_ctx->profile_ctx, det_ctx);
@ -1542,6 +1552,11 @@ void DetectEngineThreadCtxFree(DetectEngineThreadCtx *det_ctx)
SCFree(det_ctx->hcbd);
}
/* Decoded base64 data. */
if (det_ctx->base64_decoded != NULL) {
SCFree(det_ctx->base64_decoded);
}
if (det_ctx->de_ctx != NULL) {
DetectEngineThreadCtxDeinitKeywords(det_ctx->de_ctx, det_ctx);
#ifdef UNITTESTS
@ -2646,6 +2661,9 @@ const char *DetectSigmatchListEnumToString(enum DetectSigmatchListEnum type)
case DETECT_SM_LIST_MODBUS_MATCH:
return "modbus";
case DETECT_SM_LIST_BASE64_DATA:
return "base64_data";
case DETECT_SM_LIST_TEMPLATE_BUFFER_MATCH:
return "template_buffer";

14
src/detect-parse.c
Unescape Escape View File

@ -1319,6 +1319,20 @@ int SigValidate(DetectEngineCtx *de_ctx, Signature *s)
}
}
if (s->sm_lists[DETECT_SM_LIST_BASE64_DATA] != NULL) {
uint16_t idx = s->sm_lists[DETECT_SM_LIST_BASE64_DATA]->idx;
for (int list = 0; list < DETECT_SM_LIST_MAX; list++) {
if (list != DETECT_SM_LIST_BASE64_DATA &&
s->sm_lists[list] != NULL) {
if (s->sm_lists[list]->idx > idx) {
SCLogError(SC_ERR_INVALID_SIGNATURE, "Rule buffer "
"cannot be reset after base64_data.");
SCReturnInt(0);
}
}
}
}
#ifdef HAVE_LUA
DetectLuaPostSetup(s);
#endif

6
src/detect.c
Unescape Escape View File

@ -60,6 +60,8 @@
#include "detect-engine-event.h"
#include "decode.h"
#include "detect-base64-decode.h"
#include "detect-base64-data.h"
#include "detect-ipopts.h"
#include "detect-flags.h"
#include "detect-fragbits.h"
@ -1254,6 +1256,8 @@ int SigMatchSignatures(ThreadVars *th_v, DetectEngineCtx *de_ctx, DetectEngineTh
p->alerts.cnt = 0;
det_ctx->filestore_cnt = 0;
det_ctx->base64_decoded_len = 0;
/* No need to perform any detection on this packet, if the the given flag is set.*/
if (p->flags & PKT_NOPACKET_INSPECTION) {
SCReturnInt(0);
@ -5130,6 +5134,8 @@ void SigTableSetup(void)
DetectDnsQueryRegister();
DetectModbusRegister();
DetectAppLayerProtocolRegister();
DetectBase64DecodeRegister();
DetectBase64DataRegister();
DetectTemplateRegister();
DetectTemplateBufferRegister();
}

11
src/detect.h
Unescape Escape View File

@ -126,6 +126,8 @@ enum DetectSigmatchListEnum {
DETECT_SM_LIST_MODBUS_MATCH,
DETECT_SM_LIST_BASE64_DATA,
DETECT_SM_LIST_TEMPLATE_BUFFER_MATCH,
/* list for post match actions: flowbit set, flowint increment, etc */
@ -687,6 +689,9 @@ typedef struct DetectEngineCtx_ {
* we can't lookup by proto, address, port as we don't have these */
struct SigGroupHead_ *decoder_event_sgh;
/* Maximum size of the buffer for decoded base64 data. */
uint32_t base64_decode_max_len;
/** Store rule file and line so that parsers can use them in errors. */
char *rule_file;
int rule_line;
@ -883,6 +888,10 @@ typedef struct DetectEngineThreadCtx_ {
void **keyword_ctxs_array;
int keyword_ctxs_size;
uint8_t *base64_decoded;
int base64_decoded_len;
int base64_decoded_len_max;
#ifdef PROFILING
struct SCProfileData_ *rule_perf_data;
int rule_perf_data_size;
@ -1221,6 +1230,8 @@ enum {
DETECT_AL_MODBUS,
DETECT_XBITS,
DETECT_BASE64_DECODE,
DETECT_BASE64_DATA,
DETECT_TEMPLATE,
DETECT_AL_TEMPLATE_BUFFER,

1
src/util-error.c
Unescape Escape View File

@ -310,6 +310,7 @@ const char * SCErrorToString(SCError err)
CASE_CODE (SC_ERR_MT_NO_SELECTOR);
CASE_CODE (SC_ERR_MT_DUPLICATE_TENANT);
CASE_CODE (SC_ERR_NO_JSON_SUPPORT);
CASE_CODE (SC_ERR_INVALID_RULE_ARGUMENT);
}
return "UNKNOWN_ERROR";

2
src/util-error.h
Unescape Escape View File

@ -299,6 +299,8 @@ typedef enum {
SC_ERR_MT_NO_SELECTOR,
SC_ERR_MT_DUPLICATE_TENANT,
SC_ERR_NO_JSON_SUPPORT,
SC_ERR_INVALID_RULE_ARGUMENT, /**< Generic error code for invalid
* rule argument. */
} SCError;
const char *SCErrorToString(SCError);

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