diff options
author | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
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committer | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
commit | 8879b125d26e8db1a5633de5a9c692eb2d1c4f83 (patch) | |
tree | c7259d85a991b83dfa85ab2e339360669fc1f58e /framework/src/suricata/src/detect-msg.c | |
parent | 13d05bc8458758ee39cb829098241e89616717ee (diff) |
suricata checkin based on commit id a4bce14770beee46a537eda3c3f6e8e8565d5d0a
Change-Id: I9a214fa0ee95e58fc640e50bd604dac7f42db48f
Diffstat (limited to 'framework/src/suricata/src/detect-msg.c')
-rw-r--r-- | framework/src/suricata/src/detect-msg.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/framework/src/suricata/src/detect-msg.c b/framework/src/suricata/src/detect-msg.c new file mode 100644 index 00000000..e8b87529 --- /dev/null +++ b/framework/src/suricata/src/detect-msg.c @@ -0,0 +1,211 @@ +/* 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 Victor Julien <victor@inliniac.net> + * + * Implements the msg keyword + */ + +#include "suricata-common.h" +#include "detect.h" +#include "util-classification-config.h" +#include "util-debug.h" +#include "util-unittest.h" + +#include "detect-parse.h" +#include "detect-engine.h" +#include "detect-engine-mpm.h" + +static int DetectMsgSetup (DetectEngineCtx *, Signature *, char *); +void DetectMsgRegisterTests(void); + +void DetectMsgRegister (void) +{ + sigmatch_table[DETECT_MSG].name = "msg"; + sigmatch_table[DETECT_MSG].desc = "information about the rule and the possible alert"; + sigmatch_table[DETECT_MSG].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Meta-settings#msg-message"; + sigmatch_table[DETECT_MSG].Match = NULL; + sigmatch_table[DETECT_MSG].Setup = DetectMsgSetup; + sigmatch_table[DETECT_MSG].Free = NULL; + sigmatch_table[DETECT_MSG].RegisterTests = DetectMsgRegisterTests; +} + +static int DetectMsgSetup (DetectEngineCtx *de_ctx, Signature *s, char *msgstr) +{ + char *str = NULL; + uint16_t len; + + if (strlen(msgstr) == 0) + goto error; + + /* strip "'s */ + if (msgstr[0] == '\"' && msgstr[strlen(msgstr)-1] == '\"') { + str = SCStrdup(msgstr+1); + if (unlikely(str == NULL)) + goto error; + str[strlen(msgstr)-2] = '\0'; + } else if (msgstr[1] == '\"' && msgstr[strlen(msgstr)-1] == '\"') { + /* XXX do this parsing in a better way */ + str = SCStrdup(msgstr+2); + if (unlikely(str == NULL)) + goto error; + str[strlen(msgstr)-3] = '\0'; + //printf("DetectMsgSetup: format hack applied: \'%s\'\n", str); + } else { + SCLogError(SC_ERR_INVALID_VALUE, "format error \'%s\'", msgstr); + goto error; + } + + len = strlen(str); + if (len == 0) + goto error; + + char converted = 0; + + { + uint16_t i, x; + uint8_t escape = 0; + + /* it doesn't matter if we need to escape or not we remove the extra "\" to mimic snort */ + for (i = 0, x = 0; i < len; i++) { + //printf("str[%02u]: %c\n", i, str[i]); + if(!escape && str[i] == '\\') { + escape = 1; + } else if (escape) { + if (str[i] != ':' && + str[i] != ';' && + str[i] != '\\' && + str[i] != '\"') + { + SCLogDebug("character \"%c\" does not need to be escaped but is" ,str[i]); + } + escape = 0; + converted = 1; + + str[x] = str[i]; + x++; + }else{ + str[x] = str[i]; + x++; + } + + } +#if 0 //def DEBUG + if (SCLogDebugEnabled()) { + for (i = 0; i < x; i++) { + printf("%c", str[i]); + } + printf("\n"); + } +#endif + + if (converted) { + len = x; + str[len] = '\0'; + } + } + + s->msg = SCMalloc(len + 1); + if (s->msg == NULL) + goto error; + + strlcpy(s->msg, str, len + 1); + + SCFree(str); + return 0; + +error: + SCFree(str); + return -1; +} + +/* -------------------------------------Unittests-----------------------------*/ + +#ifdef UNITTESTS +static int DetectMsgParseTest01(void) +{ + int result = 0; + Signature *sig = NULL; + char *teststringparsed = "flow stateless to_server"; + DetectEngineCtx *de_ctx = DetectEngineCtxInit(); + if (de_ctx == NULL) + goto end; + + FILE *fd = SCClassConfGenerateValidDummyClassConfigFD01(); + SCClassConfLoadClassficationConfigFile(de_ctx, fd); + + sig = SigInit(de_ctx, "alert tcp any any -> any any (msg:\"flow stateless to_server\"; flow:stateless,to_server; content:\"flowstatelesscheck\"; classtype:bad-unknown; sid: 40000002; rev: 1;)"); + if(sig == NULL) + goto end; + + if (strcmp(sig->msg, teststringparsed) != 0) { + printf("got \"%s\", expected: \"%s\": ", sig->msg, teststringparsed); + goto end; + } + + result = 1; +end: + if (sig != NULL) + SigFree(sig); + if (de_ctx != NULL) + DetectEngineCtxFree(de_ctx); + return result; +} + +static int DetectMsgParseTest02(void) +{ + int result = 0; + Signature *sig = NULL; + char *teststringparsed = "msg escape tests wxy'\"\\;:"; + DetectEngineCtx *de_ctx = DetectEngineCtxInit(); + if (de_ctx == NULL) + goto end; + + sig = SigInit(de_ctx, "alert tcp any any -> any any (msg:\"msg escape tests \\w\\x\\y\\'\\\"\\\\;\\:\"; flow:to_server,established; content:\"blah\"; uricontent:\"/blah/\"; sid: 100;)"); + if(sig == NULL) + goto end; + + if (strcmp(sig->msg, teststringparsed) != 0) { + printf("got \"%s\", expected: \"%s\": ",sig->msg, teststringparsed); + goto end; + } + + result = 1; +end: + if (sig != NULL) + SigFree(sig); + if (de_ctx != NULL) + DetectEngineCtxFree(de_ctx); + return result; +} + +#endif /* UNITTESTS */ + +/** + * \brief this function registers unit tests for DetectMsg + */ +void DetectMsgRegisterTests(void) +{ +#ifdef UNITTESTS /* UNITTESTS */ + UtRegisterTest("DetectMsgParseTest01", DetectMsgParseTest01, 1); + UtRegisterTest("DetectMsgParseTest02", DetectMsgParseTest02, 1); +#endif /* UNITTESTS */ +} + |