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A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Enhanced Usage of HTTP Digest Authentication for SIP
Author(s) : J. Undery, S. Sen, V. Torvinen
Filename : draft-undery-sip-auth-01.txt
Pages : 7
Date : 14-Jun-02
HTTP Digest has some shortcomings if applied for SIP. Firstly, SIP
UA has serious difficulties to distinguish the source of
Authentication-Info and Proxy-Authentication-Info headers in SIP
forking situations. This is due to the absence of the ærealmÆ
parameter in these headers. Secondly, HTTP authentication is
particularly vulnerable against MITM bid-down attacks on the list of
algorithms (e.g., MD-5, SHA-1) or the desired security level (auth,
auth-int). Thirdly, HTTP authentication provides limited integrity
protection of only the message body. In SIP, important information
can be carried in many of the headers that may need integrity
protection. This draft proposes to add the realm parameter in the *-
Authentication-Info headers, recommends a format for computing the
nonce for detection of bid-down attack and proposes a mechanism for
integrity protection of SIP headers using MIME body.
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