df4439186f
Trim trailing whitespace. It doesn't match OpenSSL coding standards, AFAICT, and it can cause problems with git tooling. Trailing whitespace remains in test data and external source. Reviewed-by: Kurt Roeckx <kurt@roeckx.be> Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8092)
188 lines
7.8 KiB
Text
188 lines
7.8 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CTX_set_client_CA_list,
|
|
SSL_set_client_CA_list,
|
|
SSL_get_client_CA_list,
|
|
SSL_CTX_get_client_CA_list,
|
|
SSL_CTX_add_client_CA,
|
|
SSL_add_client_CA,
|
|
SSL_set0_CA_list,
|
|
SSL_CTX_set0_CA_list,
|
|
SSL_get0_CA_list,
|
|
SSL_CTX_get0_CA_list,
|
|
SSL_add1_to_CA_list,
|
|
SSL_CTX_add1_to_CA_list,
|
|
SSL_get0_peer_CA_list
|
|
- get or set CA list
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *list);
|
|
void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *list);
|
|
STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s);
|
|
STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx);
|
|
int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *cacert);
|
|
int SSL_add_client_CA(SSL *ssl, X509 *cacert);
|
|
|
|
void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list);
|
|
void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list);
|
|
const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx);
|
|
const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s);
|
|
int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x);
|
|
int SSL_add1_to_CA_list(SSL *ssl, const X509 *x);
|
|
|
|
const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The functions described here set and manage the list of CA names that are sent
|
|
between two communicating peers.
|
|
|
|
For TLS versions 1.2 and earlier the list of CA names is only sent from the
|
|
server to the client when requesting a client certificate. So any list of CA
|
|
names set is never sent from client to server and the list of CA names retrieved
|
|
by SSL_get0_peer_CA_list() is always B<NULL>.
|
|
|
|
For TLS 1.3 the list of CA names is sent using the B<certificate_authorities>
|
|
extension and may be sent by a client (in the ClientHello message) or by
|
|
a server (when requesting a certificate).
|
|
|
|
In most cases it is not necessary to set CA names on the client side. The list
|
|
of CA names that are acceptable to the client will be sent in plaintext to the
|
|
server. This has privacy implications and may also have performance implications
|
|
if the list is large. This optional capability was introduced as part of TLSv1.3
|
|
and therefore setting CA names on the client side will have no impact if that
|
|
protocol version has been disabled. Most servers do not need this and so this
|
|
should be avoided unless required.
|
|
|
|
The "client CA list" functions below only have an effect when called on the
|
|
server side.
|
|
|
|
SSL_CTX_set_client_CA_list() sets the B<list> of CAs sent to the client when
|
|
requesting a client certificate for B<ctx>. Ownership of B<list> is transferred
|
|
to B<ctx> and it should not be freed by the caller.
|
|
|
|
SSL_set_client_CA_list() sets the B<list> of CAs sent to the client when
|
|
requesting a client certificate for the chosen B<ssl>, overriding the
|
|
setting valid for B<ssl>'s SSL_CTX object. Ownership of B<list> is transferred
|
|
to B<s> and it should not be freed by the caller.
|
|
|
|
SSL_CTX_get_client_CA_list() returns the list of client CAs explicitly set for
|
|
B<ctx> using SSL_CTX_set_client_CA_list(). The returned list should not be freed
|
|
by the caller.
|
|
|
|
SSL_get_client_CA_list() returns the list of client CAs explicitly
|
|
set for B<ssl> using SSL_set_client_CA_list() or B<ssl>'s SSL_CTX object with
|
|
SSL_CTX_set_client_CA_list(), when in server mode. In client mode,
|
|
SSL_get_client_CA_list returns the list of client CAs sent from the server, if
|
|
any. The returned list should not be freed by the caller.
|
|
|
|
SSL_CTX_add_client_CA() adds the CA name extracted from B<cacert> to the
|
|
list of CAs sent to the client when requesting a client certificate for
|
|
B<ctx>.
|
|
|
|
SSL_add_client_CA() adds the CA name extracted from B<cacert> to the
|
|
list of CAs sent to the client when requesting a client certificate for
|
|
the chosen B<ssl>, overriding the setting valid for B<ssl>'s SSL_CTX object.
|
|
|
|
SSL_get0_peer_CA_list() retrieves the list of CA names (if any) the peer
|
|
has sent. This can be called on either the server or the client side. The
|
|
returned list should not be freed by the caller.
|
|
|
|
The "generic CA list" functions below are very similar to the "client CA
|
|
list" functions except that they have an effect on both the server and client
|
|
sides. The lists of CA names managed are separate - so you cannot (for example)
|
|
set CA names using the "client CA list" functions and then get them using the
|
|
"generic CA list" functions. Where a mix of the two types of functions has been
|
|
used on the server side then the "client CA list" functions take precedence.
|
|
Typically, on the server side, the "client CA list " functions should be used in
|
|
preference. As noted above in most cases it is not necessary to set CA names on
|
|
the client side.
|
|
|
|
SSL_CTX_set0_CA_list() sets the list of CAs to be sent to the peer to
|
|
B<name_list>. Ownership of B<name_list> is transferred to B<ctx> and
|
|
it should not be freed by the caller.
|
|
|
|
SSL_set0_CA_list() sets the list of CAs to be sent to the peer to B<name_list>
|
|
overriding any list set in the parent B<SSL_CTX> of B<s>. Ownership of
|
|
B<name_list> is transferred to B<s> and it should not be freed by the caller.
|
|
|
|
SSL_CTX_get0_CA_list() retrieves any previously set list of CAs set for
|
|
B<ctx>. The returned list should not be freed by the caller.
|
|
|
|
SSL_get0_CA_list() retrieves any previously set list of CAs set for
|
|
B<s> or if none are set the list from the parent B<SSL_CTX> is retrieved. The
|
|
returned list should not be freed by the caller.
|
|
|
|
SSL_CTX_add1_to_CA_list() appends the CA subject name extracted from B<x> to the
|
|
list of CAs sent to peer for B<ctx>.
|
|
|
|
SSL_add1_to_CA_list() appends the CA subject name extracted from B<x> to the
|
|
list of CAs sent to the peer for B<s>, overriding the setting in the parent
|
|
B<SSL_CTX>.
|
|
|
|
=head1 NOTES
|
|
|
|
When a TLS/SSL server requests a client certificate (see
|
|
B<SSL_CTX_set_verify(3)>), it sends a list of CAs, for which it will accept
|
|
certificates, to the client.
|
|
|
|
This list must explicitly be set using SSL_CTX_set_client_CA_list() or
|
|
SSL_CTX_set0_CA_list() for B<ctx> and SSL_set_client_CA_list() or
|
|
SSL_set0_CA_list() for the specific B<ssl>. The list specified
|
|
overrides the previous setting. The CAs listed do not become trusted (B<list>
|
|
only contains the names, not the complete certificates); use
|
|
L<SSL_CTX_load_verify_locations(3)> to additionally load them for verification.
|
|
|
|
If the list of acceptable CAs is compiled in a file, the
|
|
L<SSL_load_client_CA_file(3)> function can be used to help to import the
|
|
necessary data.
|
|
|
|
SSL_CTX_add_client_CA(), SSL_CTX_add1_to_CA_list(), SSL_add_client_CA() and
|
|
SSL_add1_to_CA_list() can be used to add additional items the list of CAs. If no
|
|
list was specified before using SSL_CTX_set_client_CA_list(),
|
|
SSL_CTX_set0_CA_list(), SSL_set_client_CA_list() or SSL_set0_CA_list(), a
|
|
new CA list for B<ctx> or B<ssl> (as appropriate) is opened.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_CTX_set_client_CA_list(), SSL_set_client_CA_list(),
|
|
SSL_CTX_set_client_CA_list(), SSL_set_client_CA_list(), SSL_CTX_set0_CA_list()
|
|
and SSL_set0_CA_list() do not return a value.
|
|
|
|
SSL_CTX_get_client_CA_list(), SSL_get_client_CA_list(), SSL_CTX_get0_CA_list()
|
|
and SSL_get0_CA_list() return a stack of CA names or B<NULL> is no CA names are
|
|
set.
|
|
|
|
SSL_CTX_add_client_CA(),SSL_add_client_CA(), SSL_CTX_add1_to_CA_list() and
|
|
SSL_add1_to_CA_list() return 1 for success and 0 for failure.
|
|
|
|
SSL_get0_peer_CA_list() returns a stack of CA names sent by the peer or
|
|
B<NULL> or an empty stack if no list was sent.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
Scan all certificates in B<CAfile> and list them as acceptable CAs:
|
|
|
|
SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(CAfile));
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>,
|
|
L<SSL_load_client_CA_file(3)>,
|
|
L<SSL_CTX_load_verify_locations(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (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
|