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[users] Use entropy service.

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FIXES #1254
This commit is contained in:
Adriaan de Groot 2020-01-30 10:32:34 +01:00
parent 5b987d4f33
commit 02e5e0de5e
1 changed files with 9 additions and 31 deletions
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40
src/modules/users/SetPasswordJob.cpp
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@ -22,6 +22,7 @@
#include "GlobalStorage.h"
#include "JobQueue.h"
#include "utils/CalamaresUtilsSystem.h"
#include "utils/Entropy.h"
#include "utils/Logger.h"
#include <QDir>
@ -63,41 +64,18 @@ SetPasswordJob::make_salt( int length )
Q_ASSERT( length >= 8 );
Q_ASSERT( length <= 128 );
static const char salt_chars[] = { '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
static_assert( sizeof( salt_chars ) == 64, "Missing salt_chars" );
std::random_device r;
std::seed_seq seed { r(), r(), r(), r(), r(), r(), r(), r() };
std::mt19937_64 twister( seed );
std::uint64_t next;
int current_length = 0;
QString salt_string;
salt_string.reserve( length + 10 );
while ( current_length < length )
CalamaresUtils::EntropySource source = CalamaresUtils::getPrintableEntropy( length, salt_string );
if ( salt_string.length() != length )
{
next = twister();
// In 64 bits, we have 10 blocks of 6 bits; map each block of 6 bits
// to a single salt character.
for ( unsigned int char_count = 0; char_count < 10; ++char_count )
{
char c = salt_chars[ next & 0b0111111 ];
next >>= 6;
salt_string.append( c );
if ( ++current_length >= length )
{
break;
}
}
cWarning() << "getPrintableEntropy returned string of length" << salt_string.length() << "expected" << length;
salt_string.truncate( length );
}
if ( source != CalamaresUtils::EntropySource::URandom )
{
cWarning() << "Entropy data for salt is low-quality.";
}
salt_string.truncate( length );
salt_string.insert( 0, "$6$" );
salt_string.append( '$' );
return salt_string;