Secure FTP Bean 2.5.10 (Default branch)


 
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Old 01-20-2009
Secure FTP Bean 2.5.10 (Default branch)

The Secure FTP Bean allows FTP connections to be made over SSL, including both implicit and explicit SSL connections, and passive and active data transfers with or without encryption.Image

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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