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@github-actions github-actions released this 18 Sep 19:03
· 154 commits to master since this release
v3.4.0-rc1
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Learn about vigilant mode.

ZLint v3.4.0-rc1

The ZMap team is happy to share ZLint v3.4.0-rc1.

Thank you to everyone who contributes to ZLint!

Breaking Changes:

No breaking changes were made in this release.

New Features:

Individual lints may now be (optionally) configurable!

For Lint Authors

For lint authors, please see CONTRIBUTING.md for more details on how to write a lint that may receive optional configurations.

For users

For users of the CLI tool, configuring a particular lint is as simple as providing a valid toml file to ZLint.

zlint -config configFile.toml mycert.pem

ZLint also provides a facility for getting a print out of a valid, all default, configuration file such that users do not have to hunt through documentation to discover what lints are configurable and what their fields are.

For example...

zlint -exampleConfig

...currently prints to the terminal....

[AppleRootStorePolicyConfig]

[CABFBaselineRequirementsConfig]

[CABFEVGuidelinesConfig]

[CommunityConfig]

[MozillaRootStorePolicyConfig]

[RFC5280Config]

[RFC5480Config]

[RFC5891Config]

[e_rsa_fermat_factorization]
Rounds = 100

Note that there is already a lint that is configurable - e_rsa_fermat_factorization. This lint checks an RSA keypair for susceptibility to the Fermat factorization attack. The more rounds used, the more likely the lint is to successfully factor a key pair. However, increasing the number of rounds dramatically increases the amount of time taken to lint a single certificate. As such, the default is set to 100 as per CABF requirements and users are free to set this value to something lower (if they wish to lint a large number of certificates and want the batch job to run faster) or to something much higher (if they suspect that a key pair is susceptible, but not trivially so).

New Lints:

  • e_key_usage_incorrect_length checks for KeyUsages that are outside the range of possible values.
  • e_incorrect_ku_encoding check for KeyUsages that are not properly encoded ASN.1 bitstrings.
  • e_rsa_fermat_factorization checks for key pairs that are susceptible to Fermat factorization.
  • e_superfluous_ku_encoding checks for KeyUsages that have unnecessary trailing zero-bytes.
  • e_ecdsa_allowed_ku key usage values keyEncipherment or dataEncipherment MUST NOT be present in certificates with ECDSA public keys
  • e_rsa_allowed_ku_ca key usage values digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment, keyCertSign, and cRLSign may only be present in a CA certificate with an RSA key
  • e_rsa_allowed_ku_ee key usage values digitalSignature, nonRepudiation, keyEncipherment, and dataEncipherment may only be present in an end entity certificate with an RSA key
  • e_rsa_allowed_ku_no_encipherment_ca if Key usage value keyCertSign or cRLSign is present in a CA certificate both keyEncipherment and dataEncipherment SHOULD NOT be present"
  • e_subject_contains_organizational_unit_name_and_no_organization_name if a subject organization name is absent then an organizational unit name MUST NOT be included in subject
  • e_organizational_unit_name_prohibited organizationalUnitName is prohibited if...the certificate was issued on or after September 1, 2022

Bug Fixes:

  • Corrected e_organizational_unit_name_prohibited to not lint CA certificates.
  • Corrected a CABF citation in e_algorithm_identifier_improper_encoding
  • Corrected an issue e_ext_tor_service_descriptor_hash_invalid wherein an OnionV3 certificate may be considered an OnionV2 certificate if a non-onion DNS entry were present in the certificate.

Changelog

  • 137e46e Lint to check for invalid KU lengths (#686)
  • 1209017 Prevent OU lint from applying to CA certificates. Add unit test to confirm change of behaviour (#691)
  • 44e12c1 Add lint to check for incorrect 'unused' bit encoding in KeyUsages (#684)
  • 3f5e40d Lint for RSA close prime Fermat factorization susceptibility (#674)
  • e5ee614 Support for Configurable Lints (#648)
  • ed9a20f Added lint to check for superfluous zero byte on KU (#682)
  • d8b86f7 Lints for allowable key usages as per RFC 8813 Section 3 and RFC 3279 Section 2.3.1 (#678)
  • c7955ed Sunset subject:organizationalUnitName (Section 7.1.4.2.2.i, CAB-Forum BR) (#643)
  • b7abf25 Add new lint to block organisational unit names as of 1st September 2022 (#675)
  • c32f6d3 Fix SPKI Encoding Lint's RSA BR Section (#679)
  • ed6287a Zlint incorrectly requires TorServiceDescriptors if V3 onion and DNS name (#677)

Full Changelog: v3.3.1...v3.4.0-rc1

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