OpenSSL Favorites
Certificate Verification
Verify Chain
# Verify certificate chain
openssl verify -CAfile ~/.secrets/certs/d000/domus-ca-chain.pem /etc/ssl/certs/modestus-razer-eaptls.pem
Full Certificate Details
# Full certificate details
openssl x509 -in /etc/ssl/certs/modestus-razer-eaptls.pem -text -noout
Check All Cert Expiry
# Check expiry dates for all certs in directory
for cert in /etc/ssl/certs/*.pem; do
expiry=$(openssl x509 -enddate -noout -in "$cert" 2>/dev/null | cut -d= -f2)
printf "%-50s %s\n" "$(basename "$cert")" "$expiry"
done
Remote Operations
Fetch Remote Certificate
# Fetch and inspect remote certificate
echo | openssl s_client -connect ise-01.inside.domusdigitalis.dev:443 -servername ise-01 2>/dev/null | \
openssl x509 -noout -subject -issuer -dates -fingerprint
Generation
Generate CSR
# Generate CSR for Vault PKI
openssl req -new -key /etc/ssl/private/host.key \
-out /tmp/host.csr \
-subj "/CN=newhost.inside.domusdigitalis.dev"
Export to PKCS12
# Export to PKCS12 for Windows import
openssl pkcs12 -export \
-in /etc/ssl/certs/host.pem \
-inkey /etc/ssl/private/host.key \
-certfile ~/.secrets/certs/d000/domus-ca-chain.pem \
-out /tmp/host.pfx
Quick Reference
| Pattern | Purpose |
|---|---|
|
Subject/issuer only |
|
Validity dates |
|
Certificate fingerprint |
|
Test TLS connection |
|
Verify chain |