Tidy up CRL handling by checking for critical extensions when it is

loaded. Add new function X509_CRL_get0_by_serial() to lookup a revoked
entry to avoid the need to access the structure directly.

Add new X509_CRL_METHOD to allow common CRL operations (verify, lookup) to be
redirected.

1 files changed, 15 insertions, 0 deletions

diff --git a/crypto/asn1/asn1_locl.h b/crypto/asn1/asn1_locl.h
index 0996902..318e27e 100644
--- a/crypto/asn1/asn1_locl.h
+++ b/crypto/asn1/asn1_locl.h
@@ -113,3 +113,18 @@ struct evp_pkey_asn1_method_st
 	int (*old_priv_encode)(const EVP_PKEY *pkey, unsigned char **pder);
 
 	} /* EVP_PKEY_ASN1_METHOD */;
+
+/* Method to handle CRL access.
+ * In general a CRL could be very large (several Mb) and can consume large
+ * amounts of resources if stored in memory by multiple processes.
+ * This method allows general CRL operations to be redirected to more
+ * efficient callbacks: for example a CRL entry database.
+ */
+
+struct x509_crl_method_st
+	{
+	int (*crl_init)(X509_CRL *crl);
+	int (*crl_free)(X509_CRL *crl);
+	int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret, ASN1_INTEGER *ser);
+	int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk);
+	};