Hi Amos,
Thanks for the info.
Yes, "mirror.aarnet.edu.au" is in the whitelist. IPv6 could be an issue as I believe AWS ELBs may not support.
We'll try the logging you suggest and perhaps an upgrade to 4.0 if we have no joy with 3.5.
Regards,
On Thu, 8 Jul 2021 at 12:19, Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote:
On 8/07/21 11:44 am, David Mills wrote:
> Hi Eliezer,
>
> We have:
>
> /etc/apt/apt.conf:
>
> Acquire::http::proxy
> "http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/
> <http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/>";
> Acquire::https::proxy
> "http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/
> <http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/>";
>
>
> /etc/apt/sources.list (comment lines removed for brevity)
>
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal main restricted
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal-updates main restricted
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal-updates universe
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal multiverse
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal-updates multiverse
> deb https://mirror.aarnet.edu.au/ubuntu/
> <https://mirror.aarnet.edu.au/ubuntu/> focal-backports main
> restricted universe multiverse
> deb https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-security main restricted
> deb https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-security universe
> deb https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-security multiverse
>
>
> squid.conf
>
...
> #
> # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
> #
>
> # Redirect HTTP to HTTPS
> acl port_80 port 80
> acl gstatic dstdomain www.gstatic.com <http://www.gstatic.com>
> http_access deny port_80 gstatic
> deny_info 301:https://%H%R gstatic
>
> acl avpc dstdomain crop-assessment.acusensus-vpc
> http_access deny port_80 avpc
> deny_info 302:<company url> avpc
>
>
> # Deny HTTP
> http_access deny port_80
>
> # Whitelist of allowed sites
> acl allowed_http_sites dstdomain "/etc/squid/squid.allowed.sites.txt"
> http_access allow allowed_http_sites vpc_cidr
>
Is the "mirror.aarnet.edu.au" or a wildcard matching it listed in file
squid.allowed.sites.txt ?
(I assume so, but checking in case it is that simple).
> # And finally deny all other access to this proxy
> http_access deny all
>
> # Squid normally listens to port 3128
> http_port 3128 ssl-bump cert=/etc/squid/cert.pem
> acl allowed_https_sites ssl::server_name
> "/etc/squid/squid.allowed.sites.txt"
> acl step1 at_step SslBump1
> acl step2 at_step SslBump2
> acl step3 at_step SslBump3
> ssl_bump peek step1 all
> ssl_bump peek step2 allowed_https_sites
> ssl_bump splice step3 allowed_https_sites
> ssl_bump terminate step2 all
>
> # Uncomment and adjust the following to add a disk cache directory.
> #cache_dir ufs /var/spool/squid 100 16 256
>
> # Leave coredumps in the first cache dir
> coredump_dir /var/spool/squid
> #
> # Add any of your own refresh_pattern entries above these.
> #
> 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
>
>
>
> Squid 3.5 is running on an EC2 instance running Amazon Linux 2. I'll
> answer the questions you asked Ben for extra info.
> ip address:
>
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
> group default qlen 1000
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 <http://127.0.0.1/8> scope host lo
> valid_lft forever preferred_lft forever
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state
> UP group default qlen 1000
> link/ether 02:1b:15:b8:9a:06 brd ff:ff:ff:ff:ff:ff
> inet 10.0.12.111/24 <http://10.0.12.111/24> brd 10.0.12.255
> scope global dynamic eth0
> valid_lft 2393sec preferred_lft 2393sec
> inet6 fe80::1b:15ff:feb8:9a06/64 scope link
> valid_lft forever preferred_lft forever
>
>
> ip rule
>
> 0: from all lookup local
> 32766: from all lookup main
> 32767: from all lookup default
>
>
> ip route show
>
> default via 10.0.12.1 dev eth0
> 10.0.12.0/24 <http://10.0.12.0/24> dev eth0 proto kernel scope link
> src 10.0.12.111
> 169.254.169.254 dev eth0
>
>
The traffic from Squid to the AArnet server is apparently using IPv6. Is
that routing setup properly too?
...
> From: squid-users On Behalf Of David Mills
> Sent: Wednesday, July 7, 2021 2:26 AM
...
> We have tried upgrading one to 20.04. Same setup. From the command
> line curl or wget can happily download an Ubuntu package from the
> Ubuntu Mirror site we use. But "apt update" gets lots of "IGN:"
> timeouts and errors.
>
> The package we test curl with is
> https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb
> <https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb>
>
> The Squid log shows a line the doesn't occur for the successful
> 18.04 "apt updates":
> 1625190959.233 81 10.0.11.191 TAG_NONE/200 0 CONNECT
> http://mirror.aarnet.edu.au:443 <http://mirror.aarnet.edu.au:443> -
> HIER_DIRECT/2001:388:30bc:cafe::beef -
>
With Ubuntu 20.04 you should have received Squid-4 (v4.10 or later).
Which logs a few things differently from Squid-3.5, particularly for
SSL-Bump activity and client connections that lack HTTP messages.
The above log line shows SSL-Bump activity. At least step2 was reached,
possibly also step3. Looking at this a little closer to see if it
completes fine or has unseen issues would be my next point of approach.
To debug what is happening with SSL-Bump use "debug_options ALL1, 11,2
83,5" and check the resulting cache.log.
> The full output of an attempt to update is:
> Ign:1 https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal InRelease
> Ign:2 https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-updates InRelease
> Ign:3 https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-backports InRelease
> Ign:4 https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal-security InRelease
These "Ign" are fine. They just mean that apt has determined those files
it has cached are up-to-date and do not need to be re-fetched right now.
The below "Err" are the problem:
> Err:5 https://mirror.aarnet.edu.au/ubuntu
> <https://mirror.aarnet.edu.au/ubuntu> focal Release
> Could not wait for server fd - select (11: Resource temporarily
> unavailable) [IP: 10.0.11.82 3128]...
>
> While running, the line
> 0% [Connecting to HTTP proxy
> (http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128
> <http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128>)]
> appears often and hang for a while.
>
> I've tried upping the squid logging and allowing all, but they
> didn't offer any additional information about the issue.
>
Your squid.conf looks fine, assuming the same http_access rules were
used in your working version.
I suspect the issue is related to one or more of:
* IPv6 routing
* ICMP config issues (maybe outside your network)
* SSL-Bump issues processing the client or server handshake traffic
typically seen with OpenSSL library version or config mismatches
between Squid, client and server.
* network timeouts affecting Squid
HTH
Amos
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