## SASL Mechanism Properties/Features

This table shows what security flags and features are supported by each of the mechanisms provided by the Cyrus SASL Library.

| MAX SSF | SECURITY PROPERTIES | FEATURES
--- | --- | --- | ---
NOPLAIN | NOACTIVE | NODICT | FORWARD | NOANON | CRED | MUTUAL | CLT FIRST | SRV FIRST | SRV LAST | PROXY | BIND | HTTP
ANONYMOUS | 0 | X |  |  |  |  |  |  | X |  |  |  |  |
CRAM-MD5 | 0 | X |  |  |  | X |  |  |  | X |  |  |  |
DIGEST-MD5 | 128 | X |  |  |  | X |  | X | reauth | initial auth | X | X |  | X
EXTERNAL | 0 | X |  | X |  | X |  |  | X |  |  | X |  |
G2 | 56 | X | X |  |  | X |  | X | X |  | X | X | X |
GSSAPI | 56 | X | X |  |  | X | X | X | X |  |  | X |  |
GSS-SPNEGO | 56 | X | X |  |  | X | X | X | X |  |  | X |  | X
KERBEROS_V4 | 56 | X | X |  |  | X |  | X |  | X |  | X |  |
LOGIN | 0 |  |  |  |  | X | X |  |  | X |  |  |  |
NTLM | 0 | X |  |  |  | X |  |  | X |  |  |  |  | X
OTP | 0 | X |  |  | X | X |  |  | X |  |  | X |  |
PASSDSS | 112 | X | X | X | X | X | X | X | X |  |  | X |  |
PLAIN | 0 |  |  |  |  | X | X |  | X |  |  | X |  |
SCRAM | 0 | X | X |  |  | X |  | X | X |  | 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.
- FORWARD - 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.
- BIND - This mechanism supports channel binding.
- HTTP - This mechanism has a profile for HTTP.