From: Josh <jrosenba@cisco.com>
Date: Thu, 20 Nov 2014 04:36:56 +0000 (-0600)
Subject: Snort2Lua fix:  content parser can now handle a comman inside of whitespace
X-Git-Tag: 3.0.0-233~1183^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4ca9ea2a46ad01015a95239cac18a9ba910e02e0;p=thirdparty%2Fsnort3.git

Snort2Lua fix:  content parser can now handle a comman inside of whitespace
---

diff --git a/tools/snort2lua/rule_states/rule_content.cc b/tools/snort2lua/rule_states/rule_content.cc
index a6ca7781d..c045569ed 100644
--- a/tools/snort2lua/rule_states/rule_content.cc
+++ b/tools/snort2lua/rule_states/rule_content.cc
@@ -20,6 +20,7 @@
 
 #include <sstream>
 #include <vector>
+#include <string>
 
 #include "conversion_state.h"
 #include "helpers/converter.h"
@@ -44,6 +45,8 @@ private:
     bool sticky_buffer_set;
     bool parse_options(std::istringstream&, std::string, std::string);
     void add_sticky_buffer(std::istringstream&, std::string buffer);
+    bool extract_payload(std::istringstream& data_stream,
+                        std::string& option);
 
 };
 
@@ -161,6 +164,32 @@ bool Content<option_name>::parse_options(
     return true;
 }
 
+
+template<const std::string *option_name>
+bool Content<option_name>::extract_payload(std::istringstream& stream,
+                                           std::string& option)
+{
+    if ( !stream.good() )
+        return false;
+
+    std::getline(stream, option, ',');
+    if (option.empty())
+        return false;
+
+    const std::size_t quote = option.find('"');
+    if ( (quote != std::string::npos) && (quote == option.rfind('"')) )
+    {
+        std::string tmp;
+        std::getline(stream, tmp, '"');
+        option += "," + tmp + "\"";
+        std::getline(stream, tmp, ',');
+        option += tmp;
+    }
+
+    util::trim(option);
+    return true;
+}
+
 template<const std::string *option_name>
 bool Content<option_name>::convert(std::istringstream& data_stream)
 {
@@ -174,27 +203,24 @@ bool Content<option_name>::convert(std::istringstream& data_stream)
     std::string arg = util::get_rule_option_args(data_stream);
     std::istringstream arg_stream(arg);
 
-    if (!util::get_string(arg_stream, val, ","))
+    if (!extract_payload(arg_stream, val) )
     {
         rule_api.bad_rule(data_stream, "content: <missing_argument>");
         return set_next_rule_state(data_stream);
     }
 
-
     rule_api.add_option(*option_name, val);
 
     // This first loop parses all of the options between the
     // content keyword and the first semicolon.
-    while (util::get_string(arg_stream, keyword, ","))
+    while ( extract_payload(arg_stream, keyword) )
     {
         std::istringstream opts(keyword);
         std::string tmp_str;
         val = "";
 
         opts >> keyword;  // gauranteed to work since get_string is true
-
-        while(opts >> tmp_str)
-            val += tmp_str + " ";
+        std::getline(opts, val);
 
         util::trim(keyword);
         util::trim(val);
@@ -218,11 +244,7 @@ bool Content<option_name>::convert(std::istringstream& data_stream)
     while(util::get_string(subopts, keyword, ":"))
     {
         val = std::string();
-        std::string tmp_str;
-
-        // get the rest of this option
-        while(subopts >> tmp_str)
-            val += tmp_str + " ";
+        std::getline(subopts, val);
 
         // necessary since options contain whitespace
         util::trim(keyword);
diff --git a/tools/snort2lua/tests/snort.conf.in b/tools/snort2lua/tests/snort.conf.in
index bc65d84de..b44ddb377 100644
--- a/tools/snort2lua/tests/snort.conf.in
+++ b/tools/snort2lua/tests/snort.conf.in
@@ -1333,3 +1333,5 @@ threshold gen_id 1, sig_id 7037, type limit, track by_src, count 1, seconds 60
 alert ip any any -> any any (msg:"TTL RULE OPTION"; ttl:-4; sid:11111112;)
 alert ip any any -> any any (msg:"TTL RULE OPTION"; ttl:5-6; sid:11111113;)
 alert ip any any -> any any (msg:"TTL RULE OPTION"; ttl:7-; sid:11111114;)
+
+alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (content:"fe, fe, fe, fe, fe, fe, fe,"; msg:"BROWSER-FIREFOX Mozilla Firefox Javascript engine function arguments memory corruption attempt"; flow:to_client,established; file_data; content:"|3B|i<25|3B|i++|29| fe += fe|3B|"; fast_pattern:only; content:"fu=new Function|28 0A|"; content:"fe, fe, fe, fe, fe, fe, fe,"; within:30; metadata:policy balanced-ips drop, policy security-ips drop, service http; reference:bugtraq,19181; reference:cve,2006-3806; classtype:attempted-user; sid:18262; rev:3;)