Bug 485933 - Use CONFIG_SCTP_HMAC_SHA1 instead of ..._MD5
Summary: Use CONFIG_SCTP_HMAC_SHA1 instead of ..._MD5
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Neil Horman
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: fedora-sha2-pkgs
TreeView+ depends on / blocked
 
Reported: 2009-02-17 15:14 UTC by Miloslav Trmač
Modified: 2009-04-01 05:48 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2009-04-01 05:48:15 UTC
Type: ---
Embargoed:

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Description Miloslav Trmač 2009-02-17 15:14:23 UTC 
Version-Release number of selected component (if applicable):
kernel-2.6.27.12-170.2.5.fc10.x86_64

Disclaimer: I know very little about SCTP, and I don't use it.

The cookies used for connection establishment (similar to TCP SYN cookies) use a configurable hash type.  The Fedora kernel currently uses a MD5 HMAC; MD5 is all but broken, it seems prudent to change the configuration to use a SHA-1 HMAC.
Comment 1 Neil Horman 2009-02-18 19:05:51 UTC 
I think there has been some concern in the past here that using SHA1 hmacs might be a problem on some older systems that don't support that algorithm.   But its probably worth updating rawhide, if for no other reason than to see what breaks.
Comment 2 Miloslav Trmač 2009-02-18 19:14:04 UTC 
As far as I understand sctp, these cookies are only used by the host that generated them, so the only possible compatibility problem could arise if the peer has buffers so small that they can not handle the additional 4 bytes.
Comment 3 Chuck Ebbert 2009-04-01 05:48:15 UTC 
This has been done:

config-generic:# CONFIG_SCTP_HMAC_NONE is not set
config-generic:CONFIG_SCTP_HMAC_SHA1=y
config-generic:# CONFIG_SCTP_HMAC_MD5 is not set
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