faghani / cert

Cert is the Go tool to get SSL certificate information.

cert

Get server's certificate information.

Installation

For Mac it provide Homebrew integration. Please install like following.

$ brew tap genkiroid/homebrew-cert
$ brew install cert

For other platforms, Precompiled binaries for released versions are available in the releases page.

Or go get.

$ go get github.com/genkiroid/cert/...

Usage

Give domain names as arguments.

$ cert github.com google.co.jp
DomainName: github.com
IP:         192.30.255.113
Issuer:     DigiCert SHA2 Extended Validation Server CA
NotBefore:  2016-03-10 09:00:00 +0900 JST
NotAfter:   2018-05-17 21:00:00 +0900 JST
CommonName: github.com
SANs:       [github.com www.github.com]
Error:

DomainName: google.co.jp
IP:         216.58.196.227
Issuer:     Google Internet Authority G3
NotBefore:  2017-10-17 19:59:51 +0900 JST
NotAfter:   2018-01-09 19:00:00 +0900 JST
CommonName: *.google.co.jp
SANs:       [*.google.co.jp google.co.jp]
Error:

You can specify port number. So you can get server certificate information of not only web server but also mail server and others.

$ cert github.com google.co.jp:443 imap.gmail.com:993
DomainName: github.com
IP:         192.30.255.113
Issuer:     DigiCert SHA2 Extended Validation Server CA
NotBefore:  2016-03-10 09:00:00 +0900 JST
NotAfter:   2018-05-17 21:00:00 +0900 JST
CommonName: github.com
SANs:       [github.com www.github.com]
Error:

DomainName: google.co.jp
IP:         172.217.27.163
Issuer:     Google Internet Authority G3
NotBefore:  2017-10-17 19:59:51 +0900 JST
NotAfter:   2018-01-09 19:00:00 +0900 JST
CommonName: *.google.co.jp
SANs:       [*.google.co.jp google.co.jp]
Error:

DomainName: imap.gmail.com
IP:         64.233.188.108
Issuer:     Google Internet Authority G2
NotBefore:  2017-10-17 19:10:29 +0900 JST
NotAfter:   2017-12-29 09:00:00 +0900 JST
CommonName: imap.gmail.com
SANs:       [imap.gmail.com]
Error:

Options are

$ cert -h
Usage of cert:
  -f string
        Output format. md: as markdown, json: as JSON.  (default "simple table")
  -k    Skip verification of server's certificate chain and host name.
  -v    Show version.
  -version
        Show version.

License

MIT

Author

genkiroid