Simple Authentication and Security Layer (sasl)

NOTE: This charter is a snapshot of the . It may now be out-of-date.

Last Modified: 2010-03-25


Tom Yu <>
Kurt Zeilenga <>

Security Area Director(s):

Sean Turner <>
Tim Polk <>

Security Area Advisor:

Tim Polk <>

Mailing Lists:

General Discussion:
To Subscribe:

Description of Working Group:

The Simple Authentication and Security Layer [RFC4422] provides key
security services to a number of application protocols including BEEP,
IMAP, LDAP, POP, and SMTP. The purpose of this working group is to
shepherd SASL, including select SASL mechanisms, through the Internet
Standards process.

This group will work to progress the SASL Technical Specification
toward Draft Standard.

The group has determined that DIGEST-MD5 [RFC2831] is not suitable for
progression on the Standards Track due to interoperability,
internationalization, and security concerns. The group will deliver a
technical specification for a suitable password-based challenge/
response replacement mechanism for Standard Track consideration.

The replacement mechanism is expected to be "better than" DIGEST-MD5
from a number of perspectives including interoperability,
internationalization, and security. The replacement mechanism is not
expected to (but may) provide a security layer itself, instead relying
on security services provided at a lower layer (e.g., TLS) and channel
bindings. The WG is expected to strike a consensus-supported balance
between the many qualities desired in the replacement. Desired
qualities include (but are not limited to) negotiated key hardening
iteration count, downgrade attack protection, and mutual authentication.
The group intends to consider a number of approaches, including
draft-newman-auth-scram and draft-josefsson-password-auth, as input.
Additionally, the WG will deliver a document summarizing its
DIGEST-MD5 concerns and requesting RFC 2831 be moved to Historic
status. This document will be based upon draft-ietf-sasl-digest-to-

This group will deliver a revised Technical Specification suitable for
publication as Proposed Standard for the GSS-API family of SASL
mechanisms. This work will be based upon draft-ietf-sasl-gs2.

The group will produce a successor document for the CRAM-MD5
specification, RFC 2195. The outcome can be a Standards Track
specification replacing RFC 2195, an Informational document moving RFC
2195 to Historic, or an Informational document that documents existing
implementation practice.

The following areas are not within the scope of work of this WG:

- new features,

- SASL Mechanisms not specifically mentioned above, and

- SASL "profiles".

However, the SASL WG is an acceptable forum for review of SASL-related
submissions produced by others as long as such review does not impede
progress on the WG objectives listed above.

Goals and Milestones:

Done  Submit revised SASL (+ EXTERNAL) I-D
Done  Submit revised SASL ANONYMOUS I-D
Done  Submit revised SASL PLAIN I-D
Done  Submit revised SASL CRAM-MD5 I-D
Done  Submit revised SASL DIGEST-MD5 I-D
Done  Submit revised SASL GSSAPI I-D
Done  Submit SASL (+ EXTERNAL) to the IESG for consideration as a Proposed Standard
Done  Submit GSSAPI to IESG for consideration as a Proposed Standard
Done  Initial I-D for RFC4422bis
Done  Initial I-D for DIGEST-MD5 to Historic
Done  WGLC I-D for DIGEST-MD5 to Historic
Done  Initial DIGEST-MD5 replacement I-D
Done  Initial GS2 I-D
Nov 2008  Initial RFC4422bis implementation report
Nov 2008  Reach consensus on CRAM-MD5 successor approach (and update milestones accordingly)
Dec 2008  WGLC RFC4422bis and implementation report I-D
Jan 2009  WGLC DIGEST-MD5 replacement I-D
Jan 2009  WGLC GS2 I-D


  • draft-ietf-sasl-gs2-20.txt
  • draft-ietf-sasl-scram-11.txt

    Request For Comments:

    RFC4013 Standard SASLprep: Stringprep profile for user names and passwords
    RFC4422 PS Simple Authentication and Security Layer (SASL)
    RFC4505 PS Anonymous Simple Authentication and Security Layer (SASL) Mechanism
    RFC4616 PS The PLAIN Simple Authentication and Security Layer (SASL) Mechanism
    RFC4752 PS The Kerberos V5 (