print x509 certificate info

Similar to openssl x509 -in <file> -text command, but handles chains, multiple files and TCP addresses. TLS/SSL version prints as well when using TCP address argument.

usage

certinfo [flags] [<file>|<host:port> ...]

file argument can be:

• local file path certinfo <filename>
• TCP network address certinfo <host:port> e.g. certinfo google.com:443
• stdin echo "<cert-content>" | certinfo

+-------------------------------------------------------------------------------------------------------------------+
| optional flags                                                                                                    |
+---------------+---------------------------------------------------------------------------------------------------+
| -chains       | whether to print verified chains as well (only applicable for host)                               |
| -expiry       | print expiry of certificates                                                                      |
| -insecure     | whether a client verifies the server's certificate chain and host name (only applicable for host) |
| -no-duplicate | do not print duplicate certificates                                                               |
| -no-expired   | do not print expired certificates                                                                 |
| -pem          | whether to print pem as well                                                                      |
| -pem-only     | whether to print only pem (useful for downloading certs from host)                                |
| -version      | certinfo version                                                                                  |
| -help         | help                                                                                              |
+---------------+---------------------------------------------------------------------------------------------------+

Flags can be set as env. variable as well (CERTINFO_<FLAG>=true e.g. CERTINFO_INSECURE=true) and can be then overridden with a flag.

download

• binary

build/install

brew

• add tap brew tap pete911/tap
• install brew install certinfo

go

go has to be installed.

• build make build
• install make install

release

Releases are published when the new tag is created e.g. git tag -m "add super cool feature" v1.0.0 && git push --follow-tags

examples

remove expired and malformed certs

• --pem-only flag returns only pem blocks that can be parsed and are type of certificate
• --no-expired flag removes expired certificates

certinfo --pem-only --no-expired <chain-file>.pem > <new-chain-file>.pem

info/verbose

certinfo vault.com:443

--- [vault.com:443 TLS 1.2] ---
Version: 3
Serial Number: 15424177460318123999
Signature Algorithm: SHA256-RSA
Type: end-entity
Issuer: CN=Go Daddy Secure Certificate Authority - G2,OU=http://certs.godaddy.com/repository/,O=GoDaddy.com\, Inc.,L=Scottsdale,ST=Arizona,C=US
Validity
    Not Before: Apr  8 05:28:12 2020 UTC
    Not After : Apr 17 02:03:38 2022 UTC
Subject: CN=*.vault.com,OU=Domain Control Validated
DNS Names: *.vault.com, vault.com
IP Addresses:
Key Usage: Digital Signature, Key Encipherment
Ext Key Usage: Server Auth, Client Auth
CA: false

Version: 3
Serial Number: 7
Signature Algorithm: SHA256-RSA
Type: intermediate
Issuer: CN=Go Daddy Root Certificate Authority - G2,O=GoDaddy.com\, Inc.,L=Scottsdale,ST=Arizona,C=US
Validity
    Not Before: May  3 07:00:00 2011 UTC
    Not After : May  3 07:00:00 2031 UTC
Subject: CN=Go Daddy Secure Certificate Authority - G2,OU=http://certs.godaddy.com/repository/,O=GoDaddy.com\, Inc.,L=Scottsdale,ST=Arizona,C=US
DNS Names:
IP Addresses:
Key Usage: Cert Sign, CRL Sign
Ext Key Usage:
CA: true

Version: 3
Serial Number: 1828629
Signature Algorithm: SHA256-RSA
Type: intermediate
Issuer: OU=Go Daddy Class 2 Certification Authority,O=The Go Daddy Group\, Inc.,C=US
Validity
    Not Before: Jan  1 07:00:00 2014 UTC
    Not After : May 30 07:00:00 2031 UTC
Subject: CN=Go Daddy Root Certificate Authority - G2,O=GoDaddy.com\, Inc.,L=Scottsdale,ST=Arizona,C=US
DNS Names:
IP Addresses:
Key Usage: Cert Sign, CRL Sign
Ext Key Usage:
CA: true

info/expiry

certinfo -expiry google.com:443

--- [google.com:443 TLS 1.3] ---
Subject: CN=*.google.com,O=Google LLC,L=Mountain View,ST=California,C=US
Expiry: 2 months 5 days 6 hours 56 minutes

Subject: CN=GTS CA 1O1,O=Google Trust Services,C=US
Expiry: 1 years 1 months 7 days 12 hours 54 minutes

local root certs

• linux ls -d /etc/ssl/certs/* | grep '.pem' | xargs certinfo -expiry
• mac cat /etc/ssl/cert.pem | certinfo -expiry