Re: Logs not showing ssl::servername

[Gabriel Vilariño <gvilarino6@xxxxxxxxx>]

Hi again!

Thanks for the info!

Log with error code and error detail at the end, both "-":

1669794718.051 INTERNAL_IP TCP_TUNNEL/500 arsenal.us-west-2.amazonaws.com splice /CN=arsenal.us-west-2.amazonaws.com 54.240.254.131 - -

The cache.log with ALL,1 does not look to share a lot, in fact I don´t see any messages referencing this transaction:

22/11/30 07:51:39 kid1| Current Directory is /
2022/11/30 07:51:39 kid1| Creating missing swap directories
2022/11/30 07:51:39 kid1| No cache_dir stores are configured.
2022/11/30 07:51:39| Removing PID file (/run/squid.pid)
2022/11/30 07:51:39 kid1| Current Directory is /
2022/11/30 07:51:39 kid1| Starting Squid Cache version 5.7 for x86_64-pc-linux-gnu...
2022/11/30 07:51:39 kid1| Service Name: squid
2022/11/30 07:51:39 kid1| Process ID 64694
2022/11/30 07:51:39 kid1| Process Roles: worker
2022/11/30 07:51:39 kid1| With 1024 file descriptors available
2022/11/30 07:51:39 kid1| Initializing IP Cache...
2022/11/30 07:51:39 kid1| DNS Socket created at [::], FD 9
2022/11/30 07:51:39 kid1| DNS Socket created at 0.0.0.0, FD 10
2022/11/30 07:51:39 kid1| Adding nameserver 127.0.0.53 from /etc/resolv.conf
2022/11/30 07:51:39 kid1| Adding domain dev.ops.mitekcloud.local from /etc/resolv.conf
2022/11/30 07:51:39 kid1| helperOpenServers: Starting 5/32 'security_file_certgen' processes
2022/11/30 07:51:39 kid1| Logfile: opening log daemon:/var/log/squid/custom.log
2022/11/30 07:51:39 kid1| Logfile Daemon: opening log /var/log/squid/custom.log
2022/11/30 07:51:40 kid1| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec
2022/11/30 07:51:40 kid1| Store logging disabled
2022/11/30 07:51:40 kid1| Swap maxSize 0 + 262144 KB, estimated 20164 objects
2022/11/30 07:51:40 kid1| Target number of buckets: 1008
2022/11/30 07:51:40 kid1| Using 8192 Store buckets
2022/11/30 07:51:40 kid1| Max Mem  size: 262144 KB
2022/11/30 07:51:40 kid1| Max Swap size: 0 KB
2022/11/30 07:51:40 kid1| Using Least Load store dir selection
2022/11/30 07:51:40 kid1| Current Directory is /
2022/11/30 07:51:40 kid1| Finished loading MIME types and icons.
2022/11/30 07:51:40 kid1| HTCP Disabled.
2022/11/30 07:51:40 kid1| Pinger socket opened on FD 27
2022/11/30 07:51:40 kid1| Squid plugin modules loaded: 0
2022/11/30 07:51:40 kid1| Adaptation support is off.
2022/11/30 07:51:40 kid1| Accepting HTTP Socket connections at conn13 local=[::]:3128 remote=[::] FD 23 flags=9
2022/11/30 07:51:40 kid1| Accepting NAT intercepted HTTP Socket connections at conn15 local=[::]:3129 remote=[::] FD 24 flags=41
2022/11/30 07:51:40 kid1| Accepting NAT intercepted SSL bumped HTTPS Socket connections at conn17 local=[::]:3130 remote=[::] FD 25 flags=41
2022/11/30 07:51:40| pinger: Initialising ICMP pinger ...
2022/11/30 07:51:40| pinger: ICMP socket opened.
2022/11/30 07:51:40| pinger: ICMPv6 socket opened
2022/11/30 07:51:41 kid1| storeLateRelease: released 0 objects
2022/11/30 07:52:09 kid1| Preparing for shutdown after 3 requests

... Starts ending the connections for shutdown, ends with next message...

2022/11/30 07:52:40 kid1| Squid Cache (Version 5.7): Exiting normally.

I checked with further log levels but it outputs a lot of data (I know this one is not for admins, I wanted to try to sent only the relevant logs since those aws agents do several calls and I was not to only record one transaction). Also if I needed, this is shared as an attachment?

Thanks in advance!

El mar, 29 nov 2022 a las 21:52, Gabriel Vilariño (<gvilarino6@xxxxxxxxx>) escribió:

Thanks Alex!

Here are the fixed logs:

1669726977.734 INTERNAL_CLIENT_IP TCP_TUNNEL/500 arsenal.us-west-2.amazonaws.com splice /CN=arsenal.us-west-2.amazonaws.com 54.240.251.223




As you can see, the destination is an aws service, more interesting, it effectively logs the splice action! That´s why I though it was letting the traffic go trough. Also the debug logs from SSL show this:

2022/11/29 10:32:38.943 kid1| 83,5| PeekingPeerConnector.cc(273) startTunneling: will tunnel instead of negotiating TLS # Last line from previously attached logs




As far as I know this means is getting to the TCP_TUNNEL, at that point it can not know anything about the internal status on the connection between client and host. If not, where I should be looking for this error? Should try to review further the debug ssl logs to se if I fend something more useful? Maybe tcpdump? This could be just the end service failing on the request? Or is an error between Squid and the end sever?




If I understand right the request that fails is the fake connect and I need to understand why. Also note almost same config logged this as TCP_TUNNEL/200 on version 3.5. But as said before, I really not sure how to check, since that service is just an agent installed on some aws machines and don´t know how to reproduce this behavior.














Thanks again! Hope I answered fine since I didn´t get the answer email.


El mar, 29 nov 2022 a las 14:06, Gabriel Vilariño (<gvilarino6@xxxxxxxxx>) escribió:

Just got it solved. Was caused because of checking default access.log. Using a new file solves all the problems.

However, in this context, what means TCP_TUNNEL/500? is it because the TLS handshake? I would like to know if it is tunneling correctly or is having some trouble (not easy to test right now).

Thanks!

El mar, 29 nov 2022 a las 13:16, Gabriel Vilariño (<gvilarino6@xxxxxxxxx>) escribió:

Hi there,

I am setting up an HTTP/HTTPS transparent proxy, meaning the clients not need any certificates for using the proxy. This works fine on version 3.5 of Squid, however after upgrading to 5.7 the behavior of the logs change:

1669723133.174   8037 10.184.19.220 TCP_TUNNEL/500 6207 CONNECT 54.240.253.128:443 - ORIGINAL_DST/54.240.253.128 -

Directive: logformat squid %ts.%03tu %>a %Ss/%03>Hs %ssl::>sni %ssl::bump_mode ssl::>cert_subject %<ru

On version 3.5 we were obtaining the domain name (an aws service) in the place of ORIGINAL_DST. Also now we are not seeing any information about the bump_mode in no one of the connections while before we were seeing it. One could trough that it could be because of the /500 message, however on a 200 one to docs.ansble.com it also don´t show any data on the sni field:

1669723513.363    332 10.184.19.220 TCP_TUNNEL/200 38192 CONNECT 104.26.0.234:443 - ORIGINAL_DST/104.26.0.234 -

Also the 500 looks to come from the squid not understanding something on the SSL negotiation:

2022/11/29 10:32:38.943 kid1| 83,4| support.cc(248) check_domain: Verifying server domain arsenal.us-west-2.amazonaws.com to certificate name/subjectAltName arsenal.us-west-2.amazonaws.com 2022/11/29 10:32:38.943 kid1| 83,5| bio.cc(136) read: FD 28 read 347 <= 65535 2022/11/29 10:32:38.943 kid1| 83,5| Io.cc(91) Handshake: -1/0 for TLS connection 0x558453168970 over conn99 local=SQUID-INTERNAL-IP:44264 remote=54.240.251.223:443 ORIGINAL_DST FD 28 flags=1 2022/11/29 10:32:38.943 kid1| 83,2| PeerConnector.cc(256) handleNegotiationResult: ERROR: failure while establishing TLS connection on FD: 280x558452b68980*1 2022/11/29 10:32:38.943 kid1| 83,5| NegotiationHistory.cc(85) retrieveNegotiatedInfo: SSL connection info on FD 28 SSL version NONE/0.0 negotiated cipher 2022/11/29 10:32:38.943 kid1| 83,5| PeekingPeerConnector.cc(84) checkForPeekAndSpliceMatched: Will check for peek and splice on FD 28 2022/11/29 10:32:38.943 kid1| 83,5| PeekingPeerConnector.cc(395) serverCertificateVerified: HTTPS server CN: arsenal.us-west-2.amazonaws.com bumped: conn99 local=SQUID-INTERNAL-IP:44264 remote=54.240.251.223:443 ORIGINAL_DST FD 28 flags=1

2022/11/29 10:32:38.943 kid1| 83,5| PeekingPeerConnector.cc(273) startTunneling: will tunnel instead of negotiating TLS

It is clear that in creates the tunnel so the 500 probably is that error? Why the bump/sni messages never log anything (according to https://wiki.squid-cache.org/Features/SslPeekAndSplice they should log splice not -). This is the config for bumping:

acl step1 at_step SslBump1
acl step2 at_step SslBump2
acl step3 at_step SslBump3
ssl_bump peek step1 all

.... http rules ...

acl allowed_https_sites ssl::server_name_regex "/etc/squid/whitelist.txt"
ssl_bump peek step2 allowed_https_sites
ssl_bump splice step3 allowed_https_sites
ssl_bump terminate step2 all

Ip tables simply redirect:

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3129

iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-port 3130 # https port on squid: https_port 3130 intercept ssl-bump cert=/etc/squid/ssl/dummy.pem

Thanks in advance, i have been trying this for a week now reading a lot of posts but not luck...

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