Save Remote SSL Certificate via Linux Command Line
Solution 1
Something like:
openssl s_client -servername remote.server.net -connect remote.server.net:443 </dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' >/path/to/certificate.pem
That's what I use with fetchmail to retrieve the certificate of an SSL capable IMAP or POP3 server (except obviously I don't use port 443)
(Note that "redundant" -servername
parameter is necessary to make openssl
do a request with SNI support.)
Solution 2
From http://www.madboa.com/geek/openssl/#cert-retrieve
#!/bin/sh
#
# usage: retrieve-cert.sh remote.host.name [port]
#
REMHOST=$1
REMPORT=${2:-443}
echo |\
openssl s_client -connect ${REMHOST}:${REMPORT} 2>&1 |\
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'
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Admin
Updated on September 17, 2022Comments
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Admin over 1 year
Can you think of any linux command-line method for saving the certificate presented by a HTTPS server? Something along the lines of having curl/wget/openssl make a SSL connection and save the cert rather than the HTTP response content.
The gui equivalent to what I'm looking for would be to browse to the HTTPS site, double-click on the browser "secure site" icon, and export the cert. Except the goal here is to do it non-interactively.
Thanks, Jim
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Jota Be over 6 yearsAny way to get the full chain?