09-27-2005
PASV mode FTP
Hello,
We have a situation wherein the FTP connections from a Client over a secure connection like ANX, when using PASV mode file transfers, the server on our end is sending out an ip address as (0,0,0,0,0,0) for PASV mode. The first four numbers denote the ip address and the last two denote the Transmit and receive block size. The result of such a response from the server is preventing the client from receiving the data via the ip that the server sends back. The control port of the client seems to be working fine, so the client can login to the FTP server and issue commands that do not involve sending data back from the server like cd to a certain directory.
However whenever there is a command which involves getting data back from the server like ls the contents of the directory or get filename (since the session is a PASV mode file transfer, which we would like to be versus using active PORTS), the command hangs and eventually times out.
I would like to know what is the required setting on the server that determines the ip address that is sent back to the client inidcating the data port/channel the server is responding with when the client uses a PASV mode file transfer session. Any suggesstion/ideas/comments is much appreciated.
Thanks
Jerardfjay
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LEARN ABOUT FREEBSD
ftp-proxy
FTP-PROXY(8) BSD System Manager's Manual FTP-PROXY(8)
NAME
ftp-proxy -- Internet File Transfer Protocol proxy daemon
SYNOPSIS
ftp-proxy [-6Adrv] [-a address] [-b address] [-D level] [-m maxsessions] [-P port] [-p port] [-q queue] [-R address] [-T tag] [-t timeout]
DESCRIPTION
ftp-proxy is a proxy for the Internet File Transfer Protocol. FTP control connections should be redirected into the proxy using the pf(4)
rdr command, after which the proxy connects to the server on behalf of the client.
The proxy allows data connections to pass, rewriting and redirecting them so that the right addresses are used. All connections from the
client to the server have their source address rewritten so they appear to come from the proxy. Consequently, all connections from the
server to the proxy have their destination address rewritten, so they are redirected to the client. The proxy uses the pf(4) anchor facility
for this.
Assuming the FTP control connection is from $client to $server, the proxy connected to the server using the $proxy source address, and $port
is negotiated, then ftp-proxy adds the following rules to the various anchors. (These example rules use inet, but the proxy also supports
inet6.)
In case of active mode (PORT or EPRT):
rdr from $server to $proxy port $port -> $client
pass quick inet proto tcp
from $server to $client port $port
In case of passive mode (PASV or EPSV):
nat from $client to $server port $port -> $proxy
pass in quick inet proto tcp
from $client to $server port $port
pass out quick inet proto tcp
from $proxy to $server port $port
The options are as follows:
-6 IPv6 mode. The proxy will expect and use IPv6 addresses for all communication. Only the extended FTP modes EPSV and EPRT are
allowed with IPv6. The proxy is in IPv4 mode by default.
-A Only permit anonymous FTP connections. Either user "ftp" or user "anonymous" is allowed.
-a address
The proxy will use this as the source address for the control connection to a server.
-b address
Address where the proxy will listen for redirected control connections. The default is 127.0.0.1, or ::1 in IPv6 mode.
-D level
Debug level, ranging from 0 to 7. Higher is more verbose. The default is 5. (These levels correspond to the syslog(3) levels.)
-d Do not daemonize. The process will stay in the foreground, logging to standard error.
-m maxsessions
Maximum number of concurrent FTP sessions. When the proxy reaches this limit, new connections are denied. The default is 100 ses-
sions. The limit can be lowered to a minimum of 1, or raised to a maximum of 500.
-P port
Fixed server port. Only used in combination with -R. The default is port 21.
-p port
Port where the proxy will listen for redirected connections. The default is port 8021.
-q queue
Create rules with queue queue appended, so that data connections can be queued.
-R address
Fixed server address, also known as reverse mode. The proxy will always connect to the same server, regardless of where the client
wanted to connect to (before it was redirected). Use this option to proxy for a server behind NAT, or to forward all connections to
another proxy.
-r Rewrite sourceport to 20 in active mode to suit ancient clients that insist on this RFC property.
-T tag The filter rules will add tag tag to data connections, and not match quick. This way alternative rules that use the tagged keyword
can be implemented following the ftp-proxy anchor. These rules can use special pf(4) features like route-to, reply-to, label,
rtable, overload, etc. that ftp-proxy does not implement itself.
-t timeout
Number of seconds that the control connection can be idle, before the proxy will disconnect. The maximum is 86400 seconds, which is
also the default. Do not set this too low, because the control connection is usually idle when large data transfers are taking
place.
-v Set the 'log' flag on pf rules committed by ftp-proxy. Use twice to set the 'log-all' flag. The pf rules do not log by default.
CONFIGURATION
To make use of the proxy, pf.conf(5) needs the following rules. All anchors are mandatory. Adjust the rules as needed.
In the NAT section:
nat-anchor "ftp-proxy/*"
rdr-anchor "ftp-proxy/*"
rdr pass on $int_if proto tcp from $lan to any port 21 ->
127.0.0.1 port 8021
In the rule section:
anchor "ftp-proxy/*"
pass out proto tcp from $proxy to any port 21
SEE ALSO
ftp(1), pf(4), pf.conf(5)
CAVEATS
pf(4) does not allow the ruleset to be modified if the system is running at a securelevel(7) higher than 1. At that level ftp-proxy cannot
add rules to the anchors and FTP data connections may get blocked.
Negotiated data connection ports below 1024 are not allowed.
The negotiated IP address for active modes is ignored for security reasons. This makes third party file transfers impossible.
ftp-proxy chroots to "/var/empty" and changes to user "proxy" to drop privileges.
BSD
February 26, 2008 BSD