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Editor: PieterSmit
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Editor: PieterSmit
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 * Online check cert + chain: https://tools.keycdn.com/ssl

OpenSSL Linux command line ssl tool

Verify a web server certificate

  • openssl s_client -showcerts -connect my.test.com:443
    • Output should end on "Verify return code: 0 (ok)"
    • As of 2017 the TLS Protocol should be TLSv1.2 at least.
  • For sni you can add -servername xyz.test.com

OpenSSL retrieve url

  • retrieve url, e.g. /healthz, note -ign_eof to wait for more input from echo

    time echo -e "GET /healthz HTTP/1.1\r\nConnection: close\r\nHost: pieter\r\n\r\n" | openssl s_client -ign_eof  -connect

SSL speed testing

openssl s_time -connect -www "/welcome/" openssl s_time -connect -www /

curl -s -w 'Testing Website Response Time for :%{url_effective}\n\nLookup Time:\t\t%{time_namelookup}\nConnect Time:\t\t%{time_connect}\nPre-transfer Time:\t%{time_pretransfer}\nStart-transfer Time:\t%{time_starttransfer}\n\nTotal Time:\t\t%{time_total}\n' -o /dev/null

  • slow

    231 connections in 0.29s; 796.55 connections/user sec, bytes read 57981
    231 connections in 31 real seconds, 251 bytes read per connection
  • fast

    30821 connections in 8.14s; 3786.36 connections/user sec, bytes read 6749799
    30821 connections in 31 real seconds, 219 bytes read per connection


vigor: Linux/OpenSSL (last edited 2020-09-08 02:49:09 by PieterSmit)