Messages in this thread Patch in this message | | | Date | Fri, 4 Mar 2022 10:10:17 -0500 | Subject | Re: [PATCH 2/4] X.509: Parse Basic Constraints for CA | From | Stefan Berger <> |
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On 3/1/22 12:36, Eric Snowberg wrote: > Parse the X.509 Basic Constraints. The basic constraints extension > identifies whether the subject of the certificate is a CA. > > BasicConstraints ::= SEQUENCE { > cA BOOLEAN DEFAULT FALSE, > pathLenConstraint INTEGER (0..MAX) OPTIONAL } > > If the CA is true, store it in a new public_key field call key_is_ca. > This will be used in a follow on patch that requires knowing if the > public key is a CA. > > Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com> > --- > crypto/asymmetric_keys/x509_cert_parser.c | 9 +++++++++ > include/crypto/public_key.h | 1 + > 2 files changed, 10 insertions(+) > > diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c > index 2899ed80bb18..38c907f4ce27 100644 > --- a/crypto/asymmetric_keys/x509_cert_parser.c > +++ b/crypto/asymmetric_keys/x509_cert_parser.c > @@ -583,6 +583,15 @@ int x509_process_extension(void *context, size_t hdrlen, > return 0; > } > > + if (ctx->last_oid == OID_basicConstraints) {
Don't you have to check whether you can access v[0] and v[1]?
if (vlen < 3)
return -EBADMSG;
or should it even be
if (vlen != 3)
return -EBADMSG;
> + if (v[0] != (ASN1_CONS_BIT | ASN1_SEQ)) > + return -EBADMSG; > + if (v[1] != vlen - 2) > + return -EBADMSG; > + if (v[1] != 0 && v[2] == ASN1_BOOL && v[3] == 1) > + ctx->cert->pub->key_is_ca = true; > + } > + > return 0; > } > > diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h > index 6d61695e1cde..0521241764b7 100644 > --- a/include/crypto/public_key.h > +++ b/include/crypto/public_key.h > @@ -26,6 +26,7 @@ struct public_key { > void *params; > u32 paramlen; > bool key_is_private; > + bool key_is_ca; > const char *id_type; > const char *pkey_algo; > };
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