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Show the certificate chain a server delivers

harmlessSSL and certificatesalle
Adjust the values, the command updates live
user@server
openssl s_client -connect example.com:443 -servername example.com -showcerts </dev/null 2>/dev/null | grep -E "^ *([0-9]+ s:|i:)"

Lists the certificates sent by the server, numbered, each with subject (s:) and issuer (i:). In a complete chain, the issuer of number 0 is the subject of number 1, and so on. If the server sends only number 0, the intermediate certificate is missing: desktop browsers often fill it in silently, while smartphones, curl or payment providers report an error.

Also searched as

  • missing intermediate certificate
  • check ssl certificate chain
  • incomplete certificate chain
  • show certificate chain openssl s_client

Related one-liners

All in SSL and certificates

Check the contents of a CSR before submitting it

$openssl req -in example.com.csr -noout -text -verify
harmlessSSL and certificates

Check the SSL certificate expiration date of a website

$openssl s_client -connect example.com:443 -servername example.com </dev/null 2>/dev/null | openssl x509 -noout -dates
harmlessSSL and certificates

Check whether a certificate expires within the next days

#openssl x509 -in /etc/letsencrypt/live/example.com/cert.pem -noout -checkend $(( 30 * 86400 )) && echo "noch gültig" || echo "läuft bald ab"
harmlessSSL and certificates

Check whether a private key matches a certificate

#openssl x509 -noout -modulus -in /etc/ssl/certs/example.com.crt | openssl md5 && openssl rsa -noout -modulus -in /etc/ssl/private/example.com.key | openssl md5
harmlessSSL and certificates

Check whether a server supports TLS 1.3

$openssl s_client -connect example.com:443 -servername example.com -tls1_3 </dev/null 2>/dev/null | grep -E "^New,|Protocol *:"
harmlessSSL and certificates

Check whether a website's certificate is trusted

$openssl s_client -connect example.com:443 -servername example.com -verify_hostname example.com </dev/null 2>/dev/null | grep "Verify return code"
harmlessSSL and certificates

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