Re: [Fetchmail-users] Using fetchmail with iCloud via IMAP

[Jon B. <bri...@nm...>]

Without the certificates extracted from the output of the command:

	openssl s_client -connect imap.mail.me.com:993 -showcerts

or with the Mozilla root certificates, available from

	https://curl.se/docs/caextract.html

fetchmail says:

	fetchmail: Server certificate verification error: self signed certificate in certificate chain
	fetchmail: Missing trust anchor certificate: /C=GB/ST=Greater Manchester/L=Salford/O=Comodo CA Limited/CN=AAA Certificate Services
	fetchmail: This could mean that the root CA's signing certificate is not in the trusted CA certificate location, or that c_rehash needs to be run on the certificate directory. For details, please see the documentation of --sslcertpath and --sslcertfile in the manual page. See README.SSL for details.
	fetchmail: OpenSSL reported: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
	fetchmail: imap.mail.me.com: SSL connection failed.
	fetchmail: socket error while fetching from <name>@imap.mail.me.com
	fetchmail: Query status=2 (SOCKET)

The certificate chain is:

depth=2 C = GB, ST = Greater Manchester, L = Salford, O = Comodo CA Limited, CN = AAA Certificate Services
verify error:num=19:self signed certificate in certificate chain
verify return:1

depth=2 C = GB, ST = Greater Manchester, L = Salford, O = Comodo CA Limited, CN = AAA Certificate Services
verify return:1

depth=1 CN = Apple Public Server RSA CA 12 - G1, O = Apple Inc., ST = California, C = US
verify return:1

depth=0 CN = imap.mail.me.com, OU = management:idms.group.859635, O = Apple Inc., ST = California, C = US
verify return:1

Also see:

	https://support.plesk.com/hc/en-us/articles/213961665-How-to-verify-that-SSL-for-IMAP-POP3-SMTP-works-and-a-proper-SSL-certificate-is-in-use

for example:

	https://www.sslshopper.com/ssl-checker.html#hostname=imap.mail.me.com:993

On Sat, Mar 12, 2022 at 01:06:32AM +0100, Matthias Andree wrote:
>
> Am 11.03.22 um 22:59 schrieb Jon Brinkmann:
> > Thanks!
> >
> > I got it working, with one additional step.  The depth=2 SSL certificate for
> > icloud.com is self-signed, so fetchmail refuses the SSL connection.  I found
> > the solution at:
> >
> > https://geekmush.wordpress.com/2007/06/29/how-to-make-fetchmail-happy-with-the-servers-ssl-cert/
>
> Congratulations, you have just installed some attacker's CA
> certificates. That is not a solution, but unsafe garbage.
>
> Please everyone remove the certificates you have installed that way.
>
> Instead, install your distribution's default Mozilla certificate
> package. Depending on your distribution, it might be called
> ca-certificates or ca_root_nss or similar.
>
> Explanation:
>
> The root CA certificate (Equifax's in that example on the website) MUST
> be obtained via a SECURE separate channel and NOT from the connection.
> There are SSL tools (for instance, SSLsplit) that will generate such CA
> certificates on the fly to crack the encrypted connection and you could
> not tell from the name that this is happening. This is typical for
> anti-virus/web security gateways/firewalls and of course also in
> malicious attacks.
>
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