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Bug 1706917

Summary:	NSS should implement continuous random test on it's seed data or use the kernel AF_ALG interface for random
Product:	Red Hat Enterprise Linux 8	Reporter:	Simo Sorce <ssorce>
Component:	nss	Assignee:	nss-nspr-maint <nss-nspr-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	low	Docs Contact:
Priority:	high
Version:	8.1	CC:	cww, dueno, hkario, rrelyea, snagar, tmraz, toneata
Target Milestone:	rc	Keywords:	Triaged, ZStream
Target Release:	8.0	Flags:	ssorce: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1725059 (view as bug list)		Environment:
Last Closed:	2019-08-05 08:16:28 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1591648, 1725059

Description Simo Sorce 2019-05-06 13:59:06 UTC

FIPS requires continuous tests of the input to the libraries CSPRNG but the kernel getrandom() (or /dev[u]random) interface does not do it.

Available options is to implement tests in the library or use the kernel AF_ALG DRBG source which wil have these tests implemented in kernel.

Comment 1 Bob Relyea 2019-05-13 20:55:29 UTC

Updating the comment to make it more clear to developers what need the CSPRNG check. NSS's PRNG already has a continous random number check. The issue is NSS gets it's seeding from the kernel, which only does the check when the AF_ALG DRBG flag is set.

The latter is preferable, because doing the check in NSS on the random output won't detect a stuck PRNG if NSS doesn't get data in the blocksize of the underlying kernel PRNG.

bob

Comment 2 Simo Sorce 2019-05-13 21:03:42 UTC

What the bug is asking is to either keep using the current interfaces as a source of random but add checks in the code that no two consecutive values repeat, or to change NSS to use the kernel AF_ALG interface (via libkcrypto or by direct access) instead as a source of random, because the kernel's interface will have checks there.