View Source ssl_crl_cache_api behaviour (ssl v11.2.6)
API for a TLS CRL (Certificate Revocation List) cache.
When TLS performs certificate path validation according to RFC 5280 it should also perform CRL validation checks. To enable the CRL checks the application needs access to CRLs. A database of CRLs can be set up in many different ways. This module provides the behavior of the API needed to integrate an arbitrary CRL cache with the erlang ssl application. It is also used by the application itself to provide a simple default implementation of a CRL cache.
Summary
Types
Reference to the CRL cache.
For description see X509 certificates records
Information for ssl applications use of Logger(3)
Callbacks
fun fresh_crl/2 will be used as input option update_crl to
public_key:pkix_crls_validate/3.
Backwards compatibility, replaced by lookup/3
Lookup the CRLs belonging to the distribution point Distributionpoint. This
function may choose to only look in the cache or to follow distribution point
links depending on how the cache is administrated.
Select the CRLs in the cache that are issued by Issuer unless the value is a
list of so called general names, see
X509 certificates records, originating
form #'DistributionPoint'.cRLissuer and representing different mechanism to
obtain the CRLs. The cache callback needs to use the appropriate entry to
retrieve the CRLs or return an empty list if it does not exist.
Types
-type crl_cache_ref() :: any().
Reference to the CRL cache.
-type dist_point() :: #'DistributionPoint'{distributionPoint :: term(), reasons :: term(), cRLIssuer :: term()}.
For description see X509 certificates records
-type logger_info() :: {logger:level(), Report :: #{description => string(), reason => term()}, logger:metadata()}.
Information for ssl applications use of Logger(3)
Callbacks
-callback fresh_crl(DistPoint :: dist_point(), CRL :: public_key:der_encoded()) -> public_key:der_encoded() | {logger, logger_info(), public_key:der_encoded()}.
fun fresh_crl/2 will be used as input option update_crl to
public_key:pkix_crls_validate/3.
It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.
-callback lookup(DistPoint :: dist_point(), CacheRef :: crl_cache_ref()) -> not_available | [public_key:der_encoded()] | {{logger, logger_info()}, [public_key:der_encoded()]}.
Backwards compatibility, replaced by lookup/3
-callback lookup(Distpoint :: dist_point(), Issuer :: public_key:issuer_name(), CacheRef :: crl_cache_ref()) -> not_available | [public_key:der_encoded()] | {{logger, logger_info()}, [public_key:der_encoded()]}.
Lookup the CRLs belonging to the distribution point Distributionpoint. This
function may choose to only look in the cache or to follow distribution point
links depending on how the cache is administrated.
The Issuer argument contains the issuer name of the certificate to
be checked. Normally the returned CRL should be issued by this
issuer, except if the cRLIssuer field of DistributionPoint has a
value, in which case that value should be used instead.
In an earlier version of this API, the lookup function received two
arguments, omitting Issuer. For compatibility, this is still
supported: if there is no lookup/3 function in the
callback module,lookup/2 is called instead.
It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.
-callback select(IssuerOrDPLocations, CacheRef) -> [CRL] | {logger, logger_info(), [CRL]} when CRL :: public_key:der_encoded(), IssuerOrDPLocations :: public_key:issuer_name() | list(), CacheRef :: crl_cache_ref().
Select the CRLs in the cache that are issued by Issuer unless the value is a
list of so called general names, see
X509 certificates records, originating
form #'DistributionPoint'.cRLissuer and representing different mechanism to
obtain the CRLs. The cache callback needs to use the appropriate entry to
retrieve the CRLs or return an empty list if it does not exist.
It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.