diff options
Diffstat (limited to 'README.SSL')
| -rw-r--r-- | README.SSL | 31 |
1 files changed, 20 insertions, 11 deletions
@@ -11,36 +11,45 @@ specific to fetchmail. In case of troubles, mail the README.SSL-SERVER file to your ISP and have them check their server configuration against it. -Unfortunately, fetchmail confuses SSL/TLS protocol levels with whether -a service needs to use in-band negotiation (STLS/STARTTLS for POP3/IMAP4) or is -totally SSL-wrapped on a separate port. For compatibility reasons, this cannot -be fixed in a bugfix release. +Unfortunately, fetchmail confuses SSL/TLS protocol levels with whether a +service needs to use in-band negotiation (STLS/STARTTLS for POP3/IMAP4) +or is totally SSL-wrapped on a separate port. For compatibility +reasons, this cannot be fixed in a bugfix or minor release. - -- Matthias Andree, 2009-05-09 +Also, fetchmail 6.4.0 and newer releases changed some of the semantics +as the result of a bug-fix, and will auto-negotiate TLSv1 or newer only. +If your server does not support this, you may have to specify --sslproto +ssl3. This is in order to prefer the newer TLS protocols, because SSLv2 +and v3 are broken. + + -- Matthias Andree, 2015-01-16 Quickstart ---------- +Use an up-to-date release of OpenSSL 1.0.1 or newer, so as to get +TLSv1.2 support. + For use of SSL or TLS with in-band negotiation on the regular service's port, i. e. with STLS or STARTTLS, use these command line options - --sslproto tls1 --sslcertck + --sslproto auto --sslcertck or these options in the rcfile (after the respective "user"... options) - sslproto tls1 sslcertck + sslproto auto sslcertck For use of SSL or TLS on a separate port, if the whole TCP connection is -SSL-encrypted from the very beginning, use these command line options (in the -rcfile, omit all leading "--"): +SSL-encrypted from the very beginning (SSL- or TLS-wrapped), use these +command line options (in the rcfile, omit all leading "--"): - --ssl --sslproto ssl3 --sslcertck + --ssl --sslproto auto --sslcertck or these options in the rcfile (after the respective "user"... options) - ssl sslproto ssl3 sslcertck + ssl sslproto auto sslcertck Background and use (long version :-)) |