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improved filtering method against lol bombs. Thx to ConcernedCitizen for pointing this out

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This commit is contained in:
csoler 2015-07-30 20:17:10 +02:00 committed by cave beat
parent d94124a18b
commit 260da99955
1 changed files with 56 additions and 1 deletions
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57
libretroshare/src/serialiser/rstlvbase.cc
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@ -494,6 +494,61 @@ bool SetTlvString(void *data, uint32_t size, uint32_t *offset,
return ok;
}
static bool readHex(char s1,char s2,uint8_t& v)
{
v=0 ;
if(s1 >= 'a' && s1 <= 'f')
v += (s1-'a')+10;
else if(s1 >= 'A' && s1 <= 'F')
v += (s1-'A')+10;
else if(s1 >= '0' && s1 <= '9')
v += s1 - '0' ;
else
return false ;
v = v << 4;
if(s2 >= 'a' && s2 <= 'f')
v += (s2-'a')+10;
else if(s2 >= 'A' && s2 <= 'F')
v += (s2-'A')+10;
else if(s2 >= '0' && s2 <= '9')
v += s2 - '0' ;
else
return false ;
return true ;
}
static bool find_decoded_string(const std::string& in,const std::string& suspicious_string)
{
int ss_pointer = 0 ;
for(int i=0;i<in.length();++i)
{
uint8_t hexv ;
char next_char ;
if(in[i] == '%' && i+2 < in.length() && readHex(in[i+1],in[i+2],hexv))
{
next_char = hexv ;
i += 2 ;
}
else
next_char = in[i] ;
if(suspicious_string[ss_pointer] == next_char)
ss_pointer++ ;
else
ss_pointer = 0 ;
if(ss_pointer == suspicious_string.length())
return true ;
}
return false ;
}
//tested
bool GetTlvString(void *data, uint32_t size, uint32_t *offset,
uint16_t type, std::string &in)
@ -564,7 +619,7 @@ bool GetTlvString(void *data, uint32_t size, uint32_t *offset,
// TODO: check what happens with partial messages
//
for(int i=0;i<number_of_suspiscious_strings;++i)
if (in.find(suspiscious_strings[i]) != std::string::npos)
if (find_decoded_string(in,suspiscious_strings[i]))
{
std::cerr << "**** suspiscious wstring contains \"" << suspiscious_strings[i] << "\" (SVG bomb suspected). " ;
std::cerr << "========== Original string =========" << std::endl;