Re: [squid-users] Squid and FTP

On 05/04/2012 10:25, Colin Coe wrote:
> On Wed, Apr 4, 2012 at 7:40 PM, Amos Jeffries<squid3_at_treenet.co.nz> wrote:
>> On 4/04/2012 6:01 p.m., Eliezer Croitoru wrote:
>>>
>>> On 04/04/2012 08:12, Colin Coe wrote:
>>>>
>>>> Hi all
>>>>
>>>> I'm trying to get our squid proxy server to allow clients to do
>>>> outbound FTP. The problem is that our corporate proxy uses tcp/8200
>>>> for http/https traffic and port 221 for FTP traffic.
>>>>
>>>> Tailing the squid logs I see that squid is attempting to send all FTP
>>>> requests direct instead of going through the corporate proxy.
>>>>
>>>> Any ideas how I'd configure squid to use the corp proxy for FTP
>>>> instead of going direct?
>>>>
>>>> Thanks
>>>>
>>>> CC
>>>>
>>> if you have parent proxy you should use the never_direct acl.
>>>
>>>
>>>
>>> acl ftp_ports port 21
>>
>>
>> Make that "20 21" (note the space between)
>>
>>
>> Amos
>
> Hi all
>
> I've made changes based on these suggestions but it still doesn't
> work. My squid.conf looks like:
> ---
> cache_peer 172.22.0.7 parent 8200 0 default no-query no-netdb-exchange
> proxy-only no-digest no-delay name=other
> cache_peer 172.22.0.7 parent 221 0 default no-query no-netdb-exchange
> proxy-only no-digest no-delay name=ftp
>
> cache_dir ufs /var/cache/squid 4900 16 256
>
> http_port 3128
>
> hierarchy_stoplist cgi-bin ?
>
> refresh_pattern ^ftp: 1440 20% 10080
> refresh_pattern ^gopher: 1440 0% 1440
> refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
> refresh_pattern . 0 20% 4320
>
> acl manager proto cache_object
> acl localhost src 127.0.0.1/32 ::1
> acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
>
> acl localnet src 10.0.0.0/8 # RFC 1918 possible internal network
> acl localnet src 172.16.0.0/12 # RFC 1918 possible internal network
> acl localnet src 192.168.0.0/16 # RFC 1918 possible internal network
> acl localnet src fc00::/7 # RFC 4193 local private network range
> acl localnet src fe80::/10 # RFC 4291 link-local (directly
> plugged) machines
>
> acl ftp_ports port 21 20
>
> acl SSL_ports port 443 21 20
> acl Safe_ports port 80 # http
> acl Safe_ports port 21 # ftp
> acl Safe_ports port 443 # https
> acl Safe_ports port 70 # gopher
> acl Safe_ports port 210 # wais
> acl Safe_ports port 1025-65535 # unregistered ports
> acl Safe_ports port 280 # http-mgmt
> acl Safe_ports port 488 # gss-http
> acl Safe_ports port 591 # filemaker
> acl Safe_ports port 777 # multiling http
> acl CONNECT method CONNECT
>
> cache_peer_access ftp allow ftp_ports
> cache_peer_access ftp deny all
> never_direct allow ftp_ports
> cache_peer_access other deny ftp_ports
>
> acl Prod dst 172.22.106.0/23
> acl Prod dst 172.22.176.0/23
> acl Dev dst 172.22.102.0/23
>
> acl BOM dstdomain .bom.gov.au
> cache deny BOM
>
> always_direct allow Dev
> always_direct allow Prod
> never_direct allow all
>
> http_access allow manager localhost
> http_access deny manager
> http_access deny !Safe_ports
> http_access deny CONNECT !SSL_ports
> http_access allow localhost
> http_access allow localnet
> http_access deny all
> ---
>
> On the proxy server, when I do a 'tcpdump host client and port 3128' I
> get nothing more than
> ---
> 15:22:19.515518 IP 172.22.106.23.48052> 172.22.106.10.3128: Flags
> [S], seq 2995762959, win 5840, options [mss 1460,sackOK,TS val
> 1681190449 ecr 0,nop,wscale 7], length 0
> 15:22:19.515567 IP 172.22.106.10.3128> 172.22.106.23.48052: Flags
> [S.], seq 1966725410, ack 2995762960, win 14480, options [mss
> 1460,sackOK,TS val 699366121 ecr 1681190449], length 0
> 15:22:19.515740 IP 172.22.106.23.48052> 172.22.106.10.3128: Flags
> [.], ack 1, win 5840, options [nop,nop,TS val 1681190449 ecr
> 699366121], length 0
> 15:23:49.606087 IP 172.22.106.23.48052> 172.22.106.10.3128: Flags
> [F.], seq 1, ack 1, win 5840, options [nop,nop,TS val 1681280540 ecr
> 699366121], length 0
> 15:23:49.606163 IP 172.22.106.10.3128> 172.22.106.23.48052: Flags
> [.], ack 2, win 14480, options [nop,nop,TS val 699456212 ecr
> 1681280540], length 0
> 15:23:49.606337 IP 172.22.106.10.3128> 172.22.106.23.48052: Flags
> [F.], seq 1, ack 2, win 14480, options [nop,nop,TS val 699456212 ecr
> 1681280540], length 0
> 15:23:49.606465 IP 172.22.106.23.48052> 172.22.106.10.3128: Flags
> [.], ack 2, win 5840, options [nop,nop,TS val 1681280540 ecr
> 699456212], length 0
> ---
>
> Nothing goes into the access.log file from this connection either.
>
so what is your problem now?
that nothing goes into the access log?
let's go two steps back.
i didnt make sure but you do have:

acl Prod dst 172.22.106.0/23
acl Prod dst 172.22.176.0/23
acl Dev dst 172.22.102.0/23

always_direct allow Dev
always_direct allow Prod

and if you dont get anything in the access log it probably means that
the clients are not connecting to the server.
how you are directing the ftp clients to squid proxy server?
you do know that squid is not intercepting ftp protocol by itself?
there was some kind of ftp interception tool as far as i remember.

so just a sec state your goals again and what you have done so far.

Regards,
Eliezer
> Any ideas?
>
> CC
>

-- 
Eliezer Croitoru
https://www1.ngtech.co.il
IT consulting for Nonprofit organizations
eliezer <at> ngtech.co.il