"Lee, Chun-Yi" <joeyli.ker...@gmail.com> writes:
> From: Chun-Yi Lee <j...@suse.com>
>
> Per X.509 spec in 4.2.1.1 section, the structure of Authority Key
> Identifier Extension is:
>
> AuthorityKeyIdentifier ::= SEQUENCE {
> keyIdentifier [0] KeyIdentifier OPTIONAL,
> authorityCertIssuer [1] GeneralNames OPTIONAL,
> authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL }
>
> KeyIdentifier ::= OCTET STRING
>
> When a certificate also provides
> authorityCertIssuer and authorityCertSerialNumber then the length of
> AuthorityKeyIdentifier SEQUENCE is likely to long form format.
> e.g.
> The example certificate demos/tunala/A-server.pem in openssl source:
>
> X509v3 Authority Key Identifier:
> keyid:49:FB:45:72:12:C4:CC:E1:45:A1:D3:08:9E:95:C4:2C:6D:55:3F:17
> DirName:/C=NZ/L=Wellington/O=Really Irresponsible Authorisation Authority
> (RIAA)/OU=Cert-stamping/CN=Jackov al-Trades/emailAddress=none@fake.domain
> serial:00
>
> Current parsing rule of OID_authorityKeyIdentifier only take care the
> short form format, it causes load certificate to modsign_keyring fail:
>
> [ 12.061147] X.509: Extension: 47
> [ 12.075121] MODSIGN: Problem loading in-kernel X.509 certificate (-74)
>
> So, this patch add the parsing rule for support long form format against
> Authority Key Identifier.
>
> v3:
> Changed the size check in "Short Form length" case, we allow v[3] smaller
> then (vlen - 4) because authorityCertIssuer and authorityCertSerialNumber
> are also possible attach in AuthorityKeyIdentifier sequence.
>
> v2:
> - Removed comma from author's name.
> - Moved 'Short Form length' comment inside the if-body.
> - Changed the type of sub to size_t.
> - Use ASN1_INDEFINITE_LENGTH rather than writing 0x80 and 127.
> - Moved the key_len's value assignment before alter v.
> - Fixed the typo of octets.
> - Add 2 to v before entering the loop for calculate the length.
> - Removed the comment of check vlen.
>
> Cc: Rusty Russell <ru...@rustcorp.com.au>
> Cc: Josh Boyer <jwbo...@redhat.com>
> Cc: Randy Dunlap <rdun...@xenotime.net>
> Cc: Herbert Xu <herb...@gondor.apana.org.au>
> Cc: "David S. Miller" <da...@davemloft.net>
> Acked-by: David Howells <dhowe...@redhat.com>
> Signed-off-by: Chun-Yi Lee <j...@suse.com>
Applied to modules-next.
Thanks,
Rusty.
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