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SFTP: try without path canonicalization if initial realpath() fails

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also make it so chdir works even without path canonicalization
This commit is contained in:
terrafrost 2022-06-14 19:33:09 -05:00
parent 85205bf6d5
commit f189b9aae2
1 changed files with 41 additions and 4 deletions
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45
phpseclib/Net/SFTP.php
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@ -773,7 +773,16 @@ class Net_SFTP extends Net_SSH2
return false; return false;
} }
$this->pwd = true;
$this->pwd = $this->_realpath('.'); $this->pwd = $this->_realpath('.');
if ($this->pwd === false) {
if (!$this->canonicalize_paths) {
user_error('Unable to canonicalize current working directory');
return false;
}
$this->canonicalize_paths = false;
$this->_reset_connection(NET_SSH2_DISCONNECT_CONNECTION_LOST);
}
$this->_update_stat_cache($this->pwd, array()); $this->_update_stat_cache($this->pwd, array());
@ -821,7 +830,9 @@ class Net_SFTP extends Net_SSH2
} }
/** /**
* Enable path canonicalization * Disable path canonicalization
*
* If this is enabled then $sftp->pwd() will not return the canonicalized absolute path
* *
* @access public * @access public
*/ */
@ -927,10 +938,37 @@ class Net_SFTP extends Net_SSH2
function _realpath($path) function _realpath($path)
{ {
if (!$this->canonicalize_paths) { if (!$this->canonicalize_paths) {
return $path; if ($this->pwd === true) {
return '.';
}
if (!strlen($path) || $path[0] != '/') {
$path = $this->pwd . '/' . $path;
} }
if ($this->pwd === false) { $parts = explode('/', $path);
$afterPWD = $beforePWD = [];
foreach ($parts as $part) {
switch ($part) {
//case '': // some SFTP servers /require/ double /'s. see https://github.com/phpseclib/phpseclib/pull/1137
case '.':
break;
case '..':
if (!empty($afterPWD)) {
array_pop($afterPWD);
} else {
$beforePWD[] = '..';
}
break;
default:
$afterPWD[] = $part;
}
}
$beforePWD = count($beforePWD) ? implode('/', $beforePWD) : '.';
return $beforePWD . '/' . implode('/', $afterPWD);
}
if ($this->pwd === true) {
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9 // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
if (!$this->_send_sftp_packet(NET_SFTP_REALPATH, pack('Na*', strlen($path), $path))) { if (!$this->_send_sftp_packet(NET_SFTP_REALPATH, pack('Na*', strlen($path), $path))) {
return false; return false;
@ -952,7 +990,6 @@ class Net_SFTP extends Net_SSH2
$this->_logError($response); $this->_logError($response);
return false; return false;
default: default:
user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
return false; return false;
} }
} }