hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Masking filter: added new obfuscation routine

Browse Source 
Masking filter: added new obfuscation routine
This commit is contained in:
MassimilianoPinto
2017-07-18 10:42:23 +02:00
parent d1bee274fa
commit e9ad2e5627
1 changed files with 12 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
server/modules/filter/masking/maskingrules.cc
View File

@ -1102,32 +1102,6 @@ bool MaskingRules::Rule::matches(const ComQueryResponse::ColumnDef& column_def,
return match; return match;
} }
/**
* Basic obfuscation routine
*
* @param c The bye to obfuscate
*
* @return The obfuscated byte
*/
static inline char maxscale_basic_obfuscation(const char c)
{
if (c >= 'a' && c <= 'z')
{
return (c - 'a' + 13) % 26 + 'a';
}
else if (c >= 'A' && c <= 'Z')
{
return (c - 'A' + 13) % 26 + 'A';
}
else
{
char d = c + 32;
d = d > 127 ? 127 : d;
return d;
}
return c;
}
/** /**
* Fills a buffer with a fill string * Fills a buffer with a fill string
* *
@ -1217,11 +1191,18 @@ void MaskingRules::MatchRule::rewrite(LEncString& s) const
void MaskingRules::ObfuscateRule::rewrite(LEncString& s) const void MaskingRules::ObfuscateRule::rewrite(LEncString& s) const
{ {
// Basic Obfuscation routine size_t i_len = s.length();
std::transform(s.begin(), LEncString::iterator i = s.begin();
s.end(), size_t c = *i + i_len;
s.begin(),
maxscale_basic_obfuscation); for (LEncString::iterator i = s.begin(); i <= s.end(); i++)
{
// ASCII 32 is first printable char
unsigned char d = abs((char)(*i ^ c)) + 32;
c += d << 3;
// ASCII 126 is last printable char
*i = d <= 126 ? d : 126;
}
} }
void MaskingRules::ReplaceRule::rewrite(LEncString& s) const void MaskingRules::ReplaceRule::rewrite(LEncString& s) const