Fetchmail with SSL

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Revision as of 06:14, 13 September 2006

My home machine runs Gentoo Linux. I pull all the e-mail from my various accounts---personal, school, etc.---to my home machine and read it from there. I use fetchmail to pull my e-mail, and I use mutt to read/send my e-mail.

This article does not attempt to go into the depths of using fetchmail. Rather, it describes a specific issue I had while pulling mail from antiflux. Specifically, I use fetchmail in conjunction with SSL and was running into error messages because the Antiflux root CA is not issued by a well-known authority. What I list below are the steps to setting up fetchmail using SSL to obtain e-mail from antiflux. This is a slightly more specific (to antiflux) description I originally posted in a Gentoo forum.

Preliminary Information

My home directory is /home/yohanan

Here are the original errors I was seeing whenever fetchmail: 

fetchmail: Server certificate verification error: unable to get local issuer certificate
fetchmail: Server certificate verification error: certificate not trusted
fetchmail: Server certificate verification error: unable to verify the first certificate

Here is the pertinent information I (now) have in my .fetchmailrc file: 

poll mail.antiflux.org with proto IMAP
        user 'yohanan' there with password 'PASSWORD' is 'yohanan' here ssl
sslcertck sslfingerprint 'E8:9C:9E:43:89:15:4E:C8:6C:BA:5C:05:5B:F3:95:C7'
sslcertpath /home/yohanan/.certs fetchall


The Steps

Step 1: create a local repository for the certificates 

$ mkdir /home/yohanan/.certs

Step 2: get the mail server certificate 

$ openssl s_client -CApath /home/yohanan/.certs -connect mail.antiflux.org:993 -showcerts

Press Ctrl-D when you get the Ok line to terminate the session. Scroll up through the output generated and copy/paste the lines of output inclusive of the lines listed below. 

-----BEGIN CERTIFICATE-----
...
<a whole lot of cryptic ascii here>
...
-----END CERTIFICATE-----

Save them in a file in /home/yohanan/.certs. The file must end in a pem extension. For example, you could name the file imap.antiflux.org.pem.

Step 3: get the root certificate 

$ cd /home/yohanan/.certs
$ wget http://antiflux.org/ca/antiflux.org-root.crt
$ mv antiflux.org-root.crt antiflux.org-root.pem
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