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Code Editor : README.SASL

# README.SASL - Readme about SASL support in nmh
#

SASL is short for the Simple Authentication and Security Layer.  Is is
a framework for adding authentication and encryption to network protocols.
It is described in IETF RFC 2222.

This release of nmh supports SASL for POP and SMTP.  The SASL support
is implemented using the Cyrus-SASL library.  This library can be found
at ftp://ftp.andrew.cmu.edu/pub/cyrus-mail.  Obviously, SASL support only
works if you use --enable-pop and the SMTP mail transport.

This release of NMH only supports "Version 2" of the Cyrus SASL library.
It should work with any newer Cyrus SASL release, but it was tested with
Cyrus SASL 2.1.22.  In particular, the CRAM-MD5 and GSSAPI (Kerberos 5)
mechanisms were tested.  Older versions of Cyrus-SASL had a bug which
could manifest when negotiating encrypting depending on the encryption
type you used, so a newer version of Cyrus-SASL is recommended.

Currently, security layers ("encryption" in SASL-speak) are supported
for both POP and SMTP.  This means that if your POP or SMTP server
_and_ the selected SASL mechanism supports it, client-server
communications will be encrypted.  In theory this should work with
any SASL mechanism that supports security layers; it has only been
tested with the GSSAPI mechanism.

If you are curious as to whether or not your communications are actually
encrypted or not, you can use the -snoop flag to the POP or SMTP utilities.
Communication that is encrypted is preceded by an (encrypted) or
(decrypted), depending on the direction of communication.

If you would like to use the GSSAPI SASL mechanism (Kerberos V), you
should read very carefully the documentation that comes with
Cyrus-SASL, specifically the GSSAPI documentation.  Getting the GSSAPI
plugin to work correctly with SASL can be "interesting" to say the least.

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Code Editor : README.SASL