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rpki-client 9.1 released

rpki-client 9.1 has just been released and will be available in the rpki-client directory of any OpenBSD mirror soon. It is recommended that all users update to this version for improved reliability.


rpki-client is a FREE, easy-to-use implementation of the Resource Public Key Infrastructure (RPKI) for Relying Parties (RP) to facilitate validation of BGP announcements. The program queries the global RPKI repository system and validates untrusted network inputs. The program outputs validated ROA payloads, BGPsec Router keys, and ASPA payloads in configuration formats suitable for OpenBGPD and BIRD, and supports emitting CSV and JSON for consumption by other routing stacks.


See RFC 6480 and RFC 6811 for a description of how RPKI and BGP Prefix Origin Validation help secure the global Internet routing system.


rpki-client was primarily developed by Kristaps Dzonsons, Claudio Jeker, Job Snijders, Theo Buehler, Theo de Raadt and Sebastian Benoit as part of the OpenBSD Project.


This release includes the following changes to the previous release:


  • Impose same-origin policy for RRDP

This addresses an oversight in the original RRDP specification (RFC8182) which allowed any publication server to cause load on another server by tricking RPs into making cross-origin requests. Imposing a same-origin policy in RRDP client/server communication isolates resources such as Delta and Snapshot files from different Repository Servers, reducing possible attack vectors.


  • Introduce tiebreaking for trust anchors

Instead of always using newly-retrieved trust anchors, compare a fetched TA with one stored in the cache. Later notBefore and earlier notAfter are used to identify a trust anchor certificate as newer. This prevents certain forms of replay attack.


  • Fix internal identification of CA resource certificates

The rpki-client utility tracks CA certificates across privilege separation boundaries. The original design was to use the subject key identifier, which is problematic because the SKI is not guaranteed to be globally unique. On the one hand, operators could choose to reuse their keys for multiple CAs and on the other hand, publishing a CA cert in the RPKI requires no proof of possession: anyone can publish CA certificates with any public key they please.


  • Verify self-signage for trust anchors

In other PKIs, trust anchors come from a trusted source and contain little to no important information apart from the public key. Therefore, libcrypto's chain verifier does not check their signatures by default because this "doesn't add any security and just wastes time". None of this is true in the RPKI and therefore trust anchors need an extra verification step.


  • Introduce a check for filenames as presented by publication points

Filenames presented by publication points are unsigned data, they must match the location in the signed object's EE certificate SIA extension which is signed data. This prevents some forms of replay attack.


  • Improved compliance with RFCs 6487 and 8209 for certificates and CRLs

The issuer field of certificates and CRLs is checked to comply with section 4.4 of RFC 6487. Various aspects of URIs provided in SIA, AIA and CRL distribution points were improved. Criticality of key usage is now enforced and the extension is inspected for all certificate types.


  • Presence of CMS signing-time is now enforced and presence of CMS binary-signing-time is disallowed, per RFC 9589.


  • Lowered the maximum acceptable manifest number to 2^159 - 1, per


  • Limit number of validated ASPAs per customer ASID, per


  • Ignore the CRL Number extension in CRLs, per


  • Various minor bug fixes and improvements in logging and error reporting


rpki-client works on all operating systems with a libcrypto library based on OpenSSL 1.1 or LibreSSL 3.6, a libtls library compatible with LibreSSL 3.6 or later, and zlib.


rpki-client is known to compile and run on at least the following operating systems: Alpine, CentOS, Debian, Fedora, FreeBSD, Red Hat, Rocky, Ubuntu, macOS, and of course OpenBSD!


It is our hope that packagers take interest and help adapt rpki-client-portable to more distributions.


The mirrors where rpki-client is available can be found on https://www.rpki-client.org/portable.html


Reporting Bugs:

===============


General bugs may be reported to tech@openbsd.org



We welcome feedback and improvements from the broader community. Thanks to all of the contributors who helped make this release possible.


Assistance to coordinate security issues is available via security@openbsd.org.

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