Shorten the timeout for openssl s_client?

[Todd Thatcher]

All,

   Using the command  “openssl s_client –connect gmail.google.com:443”  openssl gets the certificate information and stays connected until I enter QUIT, or the timeout is hit -- about 2 minutes later.   I want to script  certificate expiration date checks for out servers. Is there a command-line switch or some other advice that I can use to change this behavior?  

 

Thanks in advance

                Todd

[David Schwartz]

Todd Thatcher wrote:

Two ideas:

1) echo "QUIT" | openssl s_client -connect gmail.google.com:443

2) openssl s_client -connect gmail.google.com:443 < /dev/null

DS

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[tjhu...@gmail.com]

I know this is many years late but it comes up in google searches so I thought I would just leave this

You can use the timeout command for timing out any command.

```
timeout 3 openssl s_client -connect gmail.google.com:443 < /dev/null
```

[Steve W]

On Wednesday, 7 September 2016 at 17:05:58 UTC+2, tjhu...@gmail.com wrote:
> I know this is many years late but it comes up in google searches so I thought I would just leave this

---8<---

Let's keep it alive :)

The following is a useful approach to target multiple domains, with timeouts, keeping errors/noise suppressed and seeking a specific attribute (the certificates' Subject in this case - adapt as required):

$ I="www.google.ca www.google.fr www.google.de www.NoSuchDomain.zzz www.google.at www.google.se www.google.es"

$ for i in $I ; do R=`(timeout 5 openssl s_client -connect ${i}:443 </dev/null 2>/dev/null) | grep "subject="` ; echo "$i:$R" ; done
www.google.ca:subject=CN = *.google.ca
www.google.fr:subject=CN = *.google.fr
www.google.de:subject=CN = www.google.de
www.NoSuchDomain.zzz:
www.google.at:subject=CN = *.google.at
www.google.se:subject=CN = *.google.se
www.google.es:subject=CN = *.google.es

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