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Merge branch '1.0' into 2.0

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terrafrost 2024-12-07 14:40:01 -06:00
commit 0a142733b5
1 changed files with 22 additions and 4 deletions
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26
phpseclib/Net/SSH2.php
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@ -1140,6 +1140,19 @@ class SSH2
*/ */
var $kex_buffer = array(); var $kex_buffer = array();
/**
* Strict KEX Flag
*
* If kex-strict-s-v00@openssh.com is present in the first KEX packet it need not
* be present in subsequent packet
*
* @see self::_key_exchange()
* @see self::exec()
* @var array
* @access private
*/
var $strict_kex_flag = false;
/** /**
* Default Constructor. * Default Constructor.
* *
@ -1644,9 +1657,14 @@ class SSH2
$temp = unpack('Nlength', $this->_string_shift($response, 4)); $temp = unpack('Nlength', $this->_string_shift($response, 4));
$this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length'])); $this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length']));
if (in_array('kex-strict-s-v00@openssh.com', $this->kex_algorithms)) { if (in_array('kex-strict-s-v00@openssh.com', $this->kex_algorithms)) {
if ($this->session_id === false && count($this->kex_buffer)) { if ($this->session_id === false) {
user_error('Possible Terrapin Attack detected'); // [kex-strict-s-v00@openssh.com is] only valid in the initial SSH2_MSG_KEXINIT and MUST be ignored
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); // if [it is] present in subsequent SSH2_MSG_KEXINIT packets
$this->strict_kex_flag = true;
if (count($this->kex_buffer)) {
user_error('Possible Terrapin Attack detected');
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
}
} }
} }
@ -2057,7 +2075,7 @@ class SSH2
$this->keyExchangeInProgress = false; $this->keyExchangeInProgress = false;
if (in_array('kex-strict-s-v00@openssh.com', $this->kex_algorithms)) { if ($this->strict_kex_flag) {
$this->get_seq_no = $this->send_seq_no = 0; $this->get_seq_no = $this->send_seq_no = 0;
} }