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Check the contents of a CSR before submitting it

harmlessSSL and certificatesalle
Adjust the values, the command updates live
user@server
openssl req -in example.com.csr -noout -text -verify

Decodes the CSR and shows the subject, the public key and, under Requested Extensions, the requested Subject Alternative Names. -verify additionally checks the signature. This catches typos in domains or missing www variants before a paid certificate is issued incorrectly.

Also searched as

  • decode csr openssl
  • check csr contents command line
  • verify certificate signing request
  • csr decoder linux

Related one-liners

All in SSL and certificates

Generate a private key and CSR for multiple domains

$openssl req -new -newkey rsa:2048 -nodes -keyout example.com.key -out example.com.csr -subj "/CN=example.com" -addext "subjectAltName=DNS:example.com,DNS:www.example.com"
cautionSSL 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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