SASL Mechanism Properties/Features

	MAX SSF	SECURITY PROPERTIES							FEATURES
		NOPLAIN	NOACTIVE	NODICT	FORWARD	NOANON	CRED	MUTUAL	CLT FIRST	SRV FIRST	SRV LAST	PROXY
ANONYMOUS	0	X							X
CRAM-MD5	0	X				X				X
DIGEST-MD5	128	X				X		X	reauth	initial auth	X	X
EXTERNAL	0	X		X		X			X			X
GSSAPI	56	X	X			X		X	X			X
KERBEROS_V4	56	X	X			X		X		X		X
LOGIN	0					X				X
NTLM	0	X				X			X
OTP	0	X			X	X			X			X
PLAIN	0					X			X			X
SRP	128	X	X	X	X	X		X	X		X	X

Understanding this table:

• MAX SSF - The maximum Security Strength Factor supported by the mechanism (roughly the number of bits of encryption provided, but may have other meanings, for example an SSF of 1 indicates integrity protection only, no encryption).
• NOPLAIN - Mechanism is not susceptable to simple passive (eavesdropping) attack.
• NOACTIVE - Protection from active (non-dictionary) attacks during authentication exchange. (Implies MUTUAL).
• NODICT - Not susceptable to passive dictionary attack.
• NOFORWARD - Breaking one session won't help break the next.
• NOANON - Don't permit anonymous logins.
• CRED - Mechanism can pass client credentials.
• MUTUAL - Supports mutual authentication (authenticates the server to the client)
• CLTFIRST - The client should send first in this mechanism.
• SRVFIRST - The server must send first in this mechanism.
• SRVLAST - This mechanism supports server-send-last configurations.
• PROXY - This mechanism supports proxy authentication.