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SSH2: add umac-64 / umac-128 support

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This commit is contained in:
terrafrost 2019-09-08 11:23:29 -05:00
parent 8608463d61
commit 580eb94fd3
2 changed files with 56 additions and 3 deletions
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2
phpseclib/Crypt/Hash.php
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@ -582,6 +582,7 @@ class Hash
//
$length = strlen($m[$i]);
$pad = 32 - ($length % 32);
$pad%= 32;
$m[$i] = str_pad($m[$i], $length + $pad, "\0"); // zeropad
$m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
@ -688,6 +689,7 @@ class Hash
$m_2 = substr($m, 0x20000) . "\x80";
$length = strlen($m_2);
$pad = 16 - ($length % 16);
$pad%= 16;
$m_2 = str_pad($m_2, $length + $pad, "\0"); // zeropad
$y = self::poly(64, self::$maxwordrange64, $k64, $m_1);
$y = str_pad($y, 16, "\0", STR_PAD_LEFT);

57
phpseclib/Net/SSH2.php
View File

@ -1781,6 +1781,18 @@ class SSH2
$createKeyLength = 0; // ie. $mac_algorithm == 'none'
switch ($mac_algorithm) {
case 'umac-64@openssh.com':
$this->hmac_create = new Hash('umac-64');
$createKeyLength = 16;
break;
case 'umac-128@openssh.com':
$this->hmac_create = new Hash('umac-128');
$createKeyLength = 16;
break;
case 'hmac-sha2-512':
$this->hmac_create = new Hash('sha512');
$createKeyLength = 64;
break;
case 'hmac-sha2-256':
$this->hmac_create = new Hash('sha256');
$createKeyLength = 32;
@ -1826,6 +1838,21 @@ class SSH2
$checkKeyLength = 0;
$this->hmac_size = 0;
switch ($mac_algorithm) {
case 'umac-64@openssh.com':
$this->hmac_check = new Hash('umac-64');
$checkKeyLength = 16;
$this->hmac_size = 8;
break;
case 'umac-128@openssh.com':
$this->hmac_check = new Hash('umac-128');
$checkKeyLength = 16;
$this->hmac_size = 16;
break;
case 'hmac-sha2-512':
$this->hmac_check = new Hash('sha512');
$checkKeyLength = 64;
$this->hmac_size = 64;
break;
case 'hmac-sha2-256':
$this->hmac_check = new Hash('sha256');
$checkKeyLength = 32;
@ -3228,8 +3255,18 @@ class SSH2
if ($hmac === false || strlen($hmac) != $this->hmac_size) {
$this->bitmap = 0;
throw new \RuntimeException('Error reading socket');
} elseif ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) {
throw new \RuntimeException('Invalid HMAC');
}
$reconstructed = pack('NCa*', $packet_length, $padding_length, $payload . $padding);
if (($this->hmac_check->getHash() & "\xFF\xFF\xFF\xFF") == 'umac') {
$this->hmac_check->setNonce("\0\0\0\0" . pack('N', $this->get_seq_no));
if ($hmac != $this->hmac_check->hash($reconstructed)) {
throw new \RuntimeException('Invalid UMAC');
}
} else {
if ($hmac != $this->hmac_check->hash(pack('Na*', $this->get_seq_no, $reconstructed))) {
throw new \RuntimeException('Invalid HMAC');
}
}
}
@ -3792,7 +3829,16 @@ class SSH2
// we subtract 4 from packet_length because the packet_length field isn't supposed to include itself
$packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding);
$hmac = $this->hmac_create instanceof Hash ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : '';
if (!$this->hmac_create instanceof Hash) {
$hmac = '';
} else {
if (($this->hmac_create->getHash() & "\xFF\xFF\xFF\xFF") == 'umac') {
$this->hmac_create->setNonce("\0\0\0\0" . pack('N', $this->send_seq_no));
$hmac = $this->hmac_create->hash($packet);
} else {
$hmac = $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet));
}
}
$this->send_seq_no++;
if ($this->encrypt) {
@ -4396,8 +4442,13 @@ class SSH2
{
return [
// from <http://www.ietf.org/rfc/rfc6668.txt>:
'hmac-sha2-512',// OPTIONAL HMAC-SHA512 (digest length = key length = 64)
'hmac-sha2-256',// RECOMMENDED HMAC-SHA256 (digest length = key length = 32)
// from <https://tools.ietf.org/html/draft-miller-secsh-umac-01>:
'umac-64@openssh.com',
'umac-128@openssh.com',
'hmac-sha1-96', // RECOMMENDED first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20)
'hmac-sha1', // REQUIRED HMAC-SHA1 (digest length = key length = 20)
'hmac-md5-96', // OPTIONAL first 96 bits of HMAC-MD5 (digest length = 12, key length = 16)