Go Back   FlashFXP Forums > > > >

Bug Reports Report bugs here. (non-beta releases only)

 
 
Thread Tools Display Modes
Old 12-01-2001, 02:03 PM   #1
darkone
Disabled
FlashFXP Registered User
ioFTPD Administrator
 
darkone's Avatar
 
Join Date: Dec 2001
Posts: 2,230
Default Socks5 bug

Socks5 protocol support isnt implemented right... FlashFXP isseues CONNECT instead of BIND for every data connection... Hope you can fix this asap (flash isnt the only client having this problem though)

From RFC1928:

The BIND request is used in protocols which require the client to
accept connections from the server. FTP is a well-known example,
which uses the primary client-to-server connection for commands and
status reports, but may use a server-to-client connection for
transferring data on demand (e.g. LS, GET, PUT).

It is expected that the client side of an application protocol will
use the BIND request only to establish secondary connections after a
primary connection is established using CONNECT. In is expected that
a SOCKS server will use DST.ADDR and DST.PORT in evaluating the BIND
request.

And another CUT, just to remind you where the problem is (CMD should be 2 instead of 1):

4. Requests

Once the method-dependent subnegotiation has completed, the client
sends the request details. If the negotiated method includes
encapsulation for purposes of integrity checking and/or
confidentiality, these requests MUST be encapsulated in the method-
dependent encapsulation.

The SOCKS request is formed as follows:

+----+-----+-------+------+----------+----------+
|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
+----+-----+-------+------+----------+----------+
| 1 | 1 | X'00' | 1 | Variable | 2 |
+----+-----+-------+------+----------+----------+

Where:

o VER protocol version: X'05'
o CMD
o CONNECT X'01'
o BIND X'02'
o UDP ASSOCIATE X'03'
o RSV RESERVED
o ATYP address type of following address
o IP V4 address: X'01'
o DOMAINNAME: X'03'
o IP V6 address: X'04'
o DST.ADDR desired destination address
o DST.PORT desired destination port in network octet
order
darkone is offline  
Old 12-01-2001, 03:26 PM   #2
bigstar
FlashFXP Developer
FlashFXP Administrator
ioFTPD Beta Tester
 
bigstar's Avatar
 
Join Date: Oct 2001
Posts: 8,012
Default

This is not a bug, but rather a limitation in the socks 5 support.
bigstar is offline  
Old 12-01-2001, 04:09 PM   #3
darkone
Disabled
FlashFXP Registered User
ioFTPD Administrator
 
darkone's Avatar
 
Join Date: Dec 2001
Posts: 2,230
Default

Heh, it would be kinda useful to have there.. :i It's nearly impossible to write TLS socks5 server without it (for flashfxp use that is.. since it's not possible to determinate which connection belongs to controldata.. if possible change it as documented - if not then set RSV byte to 1 (0 is standard, but since it's reserved for later use - noone cares atm what it is - no compatability probs) on control channels...)
darkone is offline  
Old 12-01-2001, 04:15 PM   #4
darkone
Disabled
FlashFXP Registered User
ioFTPD Administrator
 
darkone's Avatar
 
Join Date: Dec 2001
Posts: 2,230
Default

Aaah.. another small thing, you could add option for control data only proxy.. (I see no reason why it wouldnt be possible - this would only work with passive mode though).. So I could make TLS proxy that would only proxy the control data :-) (now bnc needs to do the traffic too, which slows down local xfers)..
darkone is offline  
Old 12-01-2001, 09:14 PM   #5
bigstar
FlashFXP Developer
FlashFXP Administrator
ioFTPD Beta Tester
 
bigstar's Avatar
 
Join Date: Oct 2001
Posts: 8,012
Default

Just for the heck of it I tried passing x02 as the command and the proxy server returned an error. I'm using an old freeware socks5 proxy which probably doesn't support bind.

would you happen to know of a small freeware socks5 proxy that does support bind so I can mess around with it.
bigstar is offline  
Old 12-01-2001, 09:40 PM   #6
bigstar
FlashFXP Developer
FlashFXP Administrator
ioFTPD Beta Tester
 
bigstar's Avatar
 
Join Date: Oct 2001
Posts: 8,012
Default

If passive mode is disabled and socks5 is selected, I believe the proxy is bypassed for the data connection.
bigstar is offline  
Old 12-02-2001, 03:42 PM   #7
darkone
Disabled
FlashFXP Registered User
ioFTPD Administrator
 
darkone's Avatar
 
Join Date: Dec 2001
Posts: 2,230
Default

http://www.socks.nec.com/cgi-bin/download.pl

For the reference socks5..
darkone is offline  
Old 12-02-2001, 07:44 PM   #8
bigstar
FlashFXP Developer
FlashFXP Administrator
ioFTPD Beta Tester
 
bigstar's Avatar
 
Join Date: Oct 2001
Posts: 8,012
Default

Perhaps I am blind but I don't see a windows compiled binary for a socks5 server. Which is what I need. not source code.
bigstar is offline  
Old 12-04-2001, 12:28 AM   #9
darkone
Disabled
FlashFXP Registered User
ioFTPD Administrator
 
darkone's Avatar
 
Join Date: Dec 2001
Posts: 2,230
Default

I wonder, if there is a free socks5 server for windows... everything windows related is commerical
darkone is offline  
 

Tags
address, bind, client, connection, request

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Compare Folder Content -- SUBDIRS too? dgrrr General Discussion 1 04-04-2005 08:28 PM


All times are GMT -5. The time now is 04:05 PM.

Parts of this site powered by vBulletin Mods & Addons from DragonByte Technologies Ltd. (Details)