X509

Cloudflare certinfo: https://github.com/cloudflare/cfssl/blob/master/certinfo/certinfo.go

openssl x509 -inform pem -noout -text
keytool -printcert -file certificate.pem

openssl s_client -showcerts -connect YOUR_DOMAIN.COM:443 </dev/null 2>/dev/null | openssl x509 -outform PEM > MY_CERTFILE.pem 

Error response from daemon: Get https://URL/: x509: certificate signed by unknown authority

Security

• ASN.1 and x509 parsers in the kernel have historically been quite problematic (CVE-2008-1673, CVE-2016-2053),

Activities

• Read GitLab: S/MIME X509 verification of commits https://gitlab.com/gitlab-org/gitlab/issues/29782

See also

• HTTP, HTTP client, HTTP/1.1, HTTP/2, HTTP/3, HTTPS, HSTS CSR, TLS, SSL, openSSL, WebSockets, WebRTC, ssl_certificate QUIC, HPKP, CT, List of HTTP status codes, URL redirection, Content-type:, Webhook, HTTP headers, --insecure, Axios HTTP client, HTTP cookies, HTTP ETag, Hypertext Transfer Protocol -- HTTP/1.1
• CA, Root Certificates, FreeIPA, PKI, OpenCA, Wildcard certificate, certtool, certbot (Let's Encrypt), certinfo (Cloudflare), ACME, Boulder, cfssl (Cloudflare), Public key certificate, public key, TLS and X.509, OCSP, Subject Alternative Name (SAN), openssl ca, Self signed certificate, CSR, keytool, ACM, KMS, aws acm, IdenTrust, multirootca, cert-manager, ca_cert_identifier

https://prefetch.net/blog/2019/12/10/converting-x509-certificates-to-json-objects/