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terrafrost 2021-06-25 11:29:03 -05:00
parent 973bb072a0
commit bf88ba4382
1 changed files with 145 additions and 29 deletions
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174
phpseclib/Net/SFTP.php
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@ -1,4 +1,5 @@
<?php
// attributes will require a lot of work
/**
* Pure-PHP implementation of SFTP.
@ -412,9 +413,20 @@ class Net_SFTP extends Net_SSH2
// the order, in this case, matters quite a lot - see Net_SFTP::_parseAttributes() to understand why
$this->attributes = array(
0x00000001 => 'NET_SFTP_ATTR_SIZE',
0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+
0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+
0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',
0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',
0x00000010 => 'NET_SFTP_ATTR_CREATETIME', // SFTPv4+
0x00000020 => 'NET_SFTP_ATTR_MODIFYTIME',
0x00000040 => 'NET_SFTP_ATTR_ACL',
0x00000080 => 'NET_SFTP_ATTR_OWNERGROUP',
0x00000100 => 'NET_SFTP_ATTR_SUBSECOND_TIMES',
0x00000200 => 'NET_SFTP_ATTR_BITS', // SFTPv5+
0x00000400 => 'NET_SFTP_ATTR_ALLOCATION_SIZE', // SFTPv6+
0x00000800 => 'NET_SFTP_ATTR_TEXT_HINT',
0x00001000 => 'NET_SFTP_ATTR_MIME_TYPE',
0x00002000 => 'NET_SFTP_ATTR_LINK_COUNT',
0x00008000 => 'NET_SFTP_ATTR_CTIME',
// 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers
// yields inconsistent behavior depending on how php is compiled. so we left shift -1 (which, in
// two's compliment, consists of all 1 bits) by 31. on 64-bit systems this'll yield 0xFFFFFFFF80000000.
@ -586,6 +598,8 @@ class Net_SFTP extends Net_SSH2
return false;
}
$this->use_request_id = true;
if (strlen($response) < 4) {
return false;
}
@ -605,22 +619,6 @@ class Net_SFTP extends Net_SSH2
$this->extensions[$key] = $value;
}
/*
SFTPv4+ defines a 'newline' extension. SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
'newline@vandyke.com' would.
*/
/*
if (isset($this->extensions['newline@vandyke.com'])) {
$this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
unset($this->extensions['newline@vandyke.com']);
}
*/
$this->use_request_id = true;
/*
A Note on SFTPv4/5/6 support:
<http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.1> states the following:
@ -644,12 +642,54 @@ class Net_SFTP extends Net_SSH2
in draft-ietf-secsh-filexfer-13 would be quite impossible. As such, what Net_SFTP would do is close the
channel and reopen it with a new and updated SSH_FXP_INIT packet.
*/
switch ($this->version) {
case 2:
case 3:
break;
default:
return false;
if (isset($this->extensions['versions'])) {
$versions = explode(',', $this->extensions['versions']);
foreach ([6, 5, 4] as $ver) {
if (in_array($ver, $versions)) {
if ($ver === $this->version) {
break;
}
$this->version = (int) $ver;
$packet = pack('Na*Na*', strlen('version-select'), 'version-select', strlen($ver), $ver);
if (!$this->_send_sftp_packet(NET_SFTP_EXTENDED, $packet)) {
return false;
}
$response = $this->_get_sftp_packet();
if ($this->packet_type != NET_SFTP_STATUS) {
user_error('Expected SSH_FXP_STATUS');
return false;
}
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nstatus', $this->_string_shift($response, 4)));
if ($status != NET_SFTP_STATUS_OK) {
$this->_logError($response, $status);
return false;
}
break;
}
}
}
/*
SFTPv4+ defines a 'newline' extension. SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
'newline@vandyke.com' would.
*/
/*
if (isset($this->extensions['newline@vandyke.com'])) {
$this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
unset($this->extensions['newline@vandyke.com']);
}
*/
if ($this->version < 2 || $this->version > 6) {
return false;
}
$this->pwd = $this->_realpath('.');
@ -1560,6 +1600,7 @@ class Net_SFTP extends Net_SSH2
*/
function chown($filename, $uid, $recursive = false)
{
//zzzzzzzzz
// quoting from <http://www.kernel.org/doc/man-pages/online/pages/man2/chown.2.html>,
// "if the owner or group is specified as -1, then that ID is not changed"
$attr = pack('N3', NET_SFTP_ATTR_UIDGID, $uid, -1);
@ -1988,7 +2029,6 @@ class Net_SFTP extends Net_SSH2
*
* If $data is a resource then it'll be used as a resource instead.
*
*
* Setting $mode to NET_SFTP_CALLBACK will use $data as callback function, which gets only one parameter -- number
* of bytes to return, and returns a string if there is some data or null if there is no more data
*
@ -2024,6 +2064,27 @@ class Net_SFTP extends Net_SSH2
*/
function put($remote_file, $data, $mode = NET_SFTP_STRING, $start = -1, $local_start = -1, $progressCallback = null)
{
/*
SFTPv4 introduces the following new mode:
- SSH_FXP_TEXT (renamed to SSH_FXF_TEXT_MODE in v5)
SFTPv5 introduced the following new modes:
- SSH_FXF_ACCESS_READ_LOCK (renamed to SSH_FXF_BLOCK_READ in v6)
- SSH_FXF_ACCESS_WRITE_LOCK (renamed to SSH_FXF_BLOCK_WRITE in v6)
- SSH_FXF_ACCESS_DELETE_LOCK (renamed to SSH_FXF_BLOCK_DELETE in v6)
SFTPv6 introduced the following new modes:
- SSH_FXF_BLOCK_ADVISORY
- SSH_FXF_NOFOLLOW
- SSH_FXF_DELETE_ON_CLOSE
- SSH_FXF_ACCESS_AUDIT_ALARM_INFO
- SSH_FXF_ACCESS_BACKUP
- SSH_FXF_BACKUP_STREAM
- ACCESS_OVERRIDE_OWNER
none of these are currently supported
*/
if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
return false;
}
@ -2903,6 +2964,31 @@ class Net_SFTP extends Net_SSH2
return true;
}
/**
* Parse Time
*
* See '7.7. Times' of draft-ietf-secsh-filexfer-13 for more info.
*
* @param string $key
* @param int $flags
* @param string $response
* @return array
* @access private
*/
function _parseTime($key, $flags, &$response)
{
if (strlen($response) < 8) {
user_error('Malformed file attributes');
return array();
}
$attr = array();
$attr[$key] = hexdec(bin2hex($this->_string_shift($response, 4)));
if ($flags & NET_SFTP_ATTR_SUBSECOND_TIMES) {
$attr+= extract(unpack('N' . $key . '_nseconds', $this->_string_shift($response, 4)));
}
return $attr;
}
/**
* Parse Attributes
*
@ -2923,7 +3009,7 @@ class Net_SFTP extends Net_SSH2
// SFTPv4+ have a type field (a byte) that follows the above flag field
foreach ($this->attributes as $key => $value) {
switch ($flags & $key) {
case NET_SFTP_ATTR_SIZE: // 0x00000001
case NET_SFTP_ATTR_SIZE: // 0x00000001
// The size attribute is defined as an unsigned 64-bit integer.
// The following will use floats on 32-bit platforms, if necessary.
// As can be seen in the BigInteger class, floats are generally
@ -2932,14 +3018,14 @@ class Net_SFTP extends Net_SSH2
// of precision. Interpreted in filesize, 2^50 bytes = 1024 TiB.
$attr['size'] = hexdec(bin2hex($this->_string_shift($response, 8)));
break;
case NET_SFTP_ATTR_UIDGID: // 0x00000002 (SFTPv3 only)
case NET_SFTP_ATTR_UIDGID: // 0x00000002 (SFTPv3 only)
if (strlen($response) < 8) {
user_error('Malformed file attributes');
return $attr;
}
$attr+= unpack('Nuid/Ngid', $this->_string_shift($response, 8));
break;
case NET_SFTP_ATTR_PERMISSIONS: // 0x00000004
case NET_SFTP_ATTR_PERMISSIONS: // 0x00000004
if (strlen($response) < 4) {
user_error('Malformed file attributes');
return $attr;
@ -2953,14 +3039,40 @@ class Net_SFTP extends Net_SSH2
$attr+= array('type' => $fileType);
}
break;
case NET_SFTP_ATTR_ACCESSTIME: // 0x00000008
case NET_SFTP_ATTR_ACCESSTIME: // 0x00000008
if ($this->version >= 4) {
$attr+= $this->_parseTime('atime', $flags, $response);
break;
}
if (strlen($response) < 8) {
user_error('Malformed file attributes');
return $attr;
}
$attr+= unpack('Natime/Nmtime', $this->_string_shift($response, 8));
break;
case NET_SFTP_ATTR_EXTENDED: // 0x80000000
case NET_SFTP_ATTR_CREATETIME: // 0x00000010 (SFTPv4+)
$attr+= $this->_parseTime('createtime', $flags, $response);
break;
case NET_SFTP_ATTR_MODIFYTIME: // 0x00000020
$attr+= $this->_parseTime('mtime', $flags, $response);
break;
case NET_SFTP_ATTR_ACL: // 0x00000040
// see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-04#section-5.7
// currently unsupported
break;
case NET_SFTP_ATTR_OWNERGROUP: // 0x00000080
break;
case NET_SFTP_ATTR_SUBSECOND_TIMES: // 0x00000100
break;
case NET_SFTP_ATTR_BITS: // 0x00000200 (SFTPv5+)
case NET_SFTP_ATTR_ALLOCATION_SIZE: // 0x00000400 (SFTPv6+)
case NET_SFTP_ATTR_TEXT_HINT: // 0x00000800
case NET_SFTP_ATTR_MIME_TYPE: // 0x00001000
case NET_SFTP_ATTR_LINK_COUNT: // 0x00002000
case NET_SFTP_ATTR_UNTRANSLATED_NAME:// 0x00004000
case NET_SFTP_ATTR_CTIME: // 0x00008000
break;
case NET_SFTP_ATTR_EXTENDED: // 0x80000000
if (strlen($response) < 4) {
user_error('Malformed file attributes');
return $attr;
@ -3298,6 +3410,10 @@ class Net_SFTP extends Net_SSH2
*/
function getSupportedVersions()
{
if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
return false;
}
$temp = array('version' => $this->version);
if (isset($this->extensions['versions'])) {
$temp['extensions'] = $this->extensions['versions'];