mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
95 lines
3.1 KiB
Plaintext
95 lines
3.1 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_check_chain - check certificate chain suitability
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SSL_check_chain() checks whether certificate B<x>, private key B<pk> and
|
|
certificate chain B<chain> is suitable for use with the current session
|
|
B<s>.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_check_chain() returns a bitmap of flags indicating the validity of the
|
|
chain.
|
|
|
|
B<CERT_PKEY_VALID>: the chain can be used with the current session.
|
|
If this flag is B<not> set then the certificate will never be used even
|
|
if the application tries to set it because it is inconsistent with the
|
|
peer preferences.
|
|
|
|
B<CERT_PKEY_SIGN>: the EE key can be used for signing.
|
|
|
|
B<CERT_PKEY_EE_SIGNATURE>: the signature algorithm of the EE certificate is
|
|
acceptable.
|
|
|
|
B<CERT_PKEY_CA_SIGNATURE>: the signature algorithms of all CA certificates
|
|
are acceptable.
|
|
|
|
B<CERT_PKEY_EE_PARAM>: the parameters of the end entity certificate are
|
|
acceptable (e.g. it is a supported curve).
|
|
|
|
B<CERT_PKEY_CA_PARAM>: the parameters of all CA certificates are acceptable.
|
|
|
|
B<CERT_PKEY_EXPLICIT_SIGN>: the end entity certificate algorithm
|
|
can be used explicitly for signing (i.e. it is mentioned in the signature
|
|
algorithms extension).
|
|
|
|
B<CERT_PKEY_ISSUER_NAME>: the issuer name is acceptable. This is only
|
|
meaningful for client authentication.
|
|
|
|
B<CERT_PKEY_CERT_TYPE>: the certificate type is acceptable. Only meaningful
|
|
for client authentication.
|
|
|
|
B<CERT_PKEY_SUITEB>: chain is suitable for Suite B use.
|
|
|
|
=head1 NOTES
|
|
|
|
SSL_check_chain() must be called in servers after a client hello message or in
|
|
clients after a certificate request message. It will typically be called
|
|
in the certificate callback.
|
|
|
|
An application wishing to support multiple certificate chains may call this
|
|
function on each chain in turn: starting with the one it considers the
|
|
most secure. It could then use the chain of the first set which returns
|
|
suitable flags.
|
|
|
|
As a minimum the flag B<CERT_PKEY_VALID> must be set for a chain to be
|
|
usable. An application supporting multiple chains with different CA signature
|
|
algorithms may also wish to check B<CERT_PKEY_CA_SIGNATURE> too. If no
|
|
chain is suitable a server should fall back to the most secure chain which
|
|
sets B<CERT_PKEY_VALID>.
|
|
|
|
The validity of a chain is determined by checking if it matches a supported
|
|
signature algorithm, supported curves and in the case of client authentication
|
|
certificate types and issuer names.
|
|
|
|
Since the supported signature algorithms extension is only used in TLS 1.2
|
|
and DTLS 1.2 the results for earlier versions of TLS and DTLS may not be
|
|
very useful. Applications may wish to specify a different "legacy" chain
|
|
for earlier versions of TLS or DTLS.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<SSL_CTX_set_cert_cb(3)>,
|
|
L<ssl(7)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|