Bug 2073070

Summary: SHA-1 DNSSEC signatures are broken in DEFAULT crypto-policy
Product: [Fedora] Fedora EPEL Reporter: Petr Menšík <pemensik>
Component: knotAssignee: Paul Wouters <paul.wouters>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Version: epel9CC: dns-sig, jruzicka.pkg, jv+fedora, nicki, paul.wouters, pspacek
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Description Petr Menšík 2022-04-07 15:11:37 UTC 
Description of problem:
Crypto policies in RHEL9 will block SHA-1 signatures by default. However RFC 8624 [1] requires SHA-1 validation as mandatory. Because crypto policy is mandatory, it will affect any DNSSEC validating software using openssl or gnutls.

Version-Release number of selected component (if applicable):
openssl-libs-3.0.1-21.el9.x86_64
crypto-policies-20220223-1.git5203b41.el9_0.1.noarch
gnutls-3.7.3-9.el9.x86_64

How reproducible:
reliable

Steps to Reproduce:
1. delv int

Actual results:
# delv int
;; EVP_VerifyFinal failed (verify failure)
;; error:03000098:digital envelope routines::invalid digest:crypto/evp/pmeth_lib.c:959:
;; EVP_VerifyFinal failed (verify failure)
;; error:03000098:digital envelope routines::invalid digest:crypto/evp/pmeth_lib.c:959:
;; validating int/DNSKEY: no valid signature found
;; insecurity proof failed resolving 'int/DNSKEY/IN': 10.2.32.1#53
;;   validating rtma1k8jfek31ikuajq7rie9dufhe33b.int/NSEC3: bad cache hit (int/DNSKEY)
;; broken trust chain resolving 'int/A/IN': 10.2.32.1#53
;; resolution failed: broken trust chain


Expected results:
;; resolution failed: ncache nxrrset
; negative response, fully validated
; int.			3000	IN	\-A	;-$NXRRSET
; int. SOA sns.dns.icann.org. noc.dns.icann.org. 2022040601 3600 1800 604800 3600
; int. RRSIG SOA ...
; rtma1k8jfek31ikuajq7rie9dufhe33b.int. RRSIG NSEC3 ...
; rtma1k8jfek31ikuajq7rie9dufhe33b.int. NSEC3 1 0 5 398954BBB503FF9D S2BQ3UEQJHSGU7FE7M8QPQ563E9PTFH5 NS SOA RRSIG DNSKEY NSEC3PARAM


Additional info:
command "update-crypto-policies --set DEFAULT:SHA1" will switch to crypto policy, which would allow previous behaviour and success of both signature verification and creation.

1. https://datatracker.ietf.org/doc/html/rfc8624#section-3.1