Messages in this thread Patch in this message | | | From | Eric Snowberg <> | Subject | [PATCH 2/4] X.509: Parse Basic Constraints for CA | Date | Tue, 1 Mar 2022 12:36:49 -0500 |
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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) { + 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; }; -- 2.27.0
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