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Masking filter: added new obfuscation routine

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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
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43
server/modules/filter/masking/maskingrules.cc
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@ -1102,32 +1102,6 @@ bool MaskingRules::Rule::matches(const ComQueryResponse::ColumnDef& column_def,
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
*
@ -1217,11 +1191,18 @@ void MaskingRules::MatchRule::rewrite(LEncString& s) const
void MaskingRules::ObfuscateRule::rewrite(LEncString& s) const
{
// Basic Obfuscation routine
std::transform(s.begin(),
s.end(),
s.begin(),
maxscale_basic_obfuscation);
size_t i_len = s.length();
LEncString::iterator i = s.begin();
size_t c = *i + i_len;
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