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=pod
=head1 NAME
SSL_CTX_set_client_CA_list, SSL_set_client_CA_list, SSL_CTX_add_client_CA,
SSL_add_client_CA - set list of CAs sent to the client when requesting a
client certificate
=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);
int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *cacert);
int SSL_add_client_CA(SSL *ssl, X509 *cacert);
=head1 DESCRIPTION
SSL_CTX_set_client_CA_list() sets the B<list> of CAs sent to the client when
requesting a client certificate for B<ctx>.
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.
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.
=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() for
B<ctx> and SSL_set_client_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)|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)|SSL_load_client_CA_file(3)>
function can be used to help importing the necessary data.
SSL_CTX_add_client_CA() and SSL_add_client_CA() can be used to add additional
items the list of client CAs. If no list was specified before using
SSL_CTX_set_client_CA_list() or SSL_set_client_CA_list(), a new client
CA list for B<ctx> or B<ssl> (as appropriate) is opened.
These functions are only useful for TLS/SSL servers.
=head1 RETURN VALUES
SSL_CTX_set_client_CA_list() and SSL_set_client_CA_list() do not return
diagnostic information.
SSL_CTX_add_client_CA() and SSL_add_client_CA() have the following return
values:
=over 4
=item Z<>0
A failure while manipulating the STACK_OF(X509_NAME) object occurred or
the X509_NAME could not be extracted from B<cacert>. Check the error stack
to find out the reason.
=item Z<>1
The operation succeeded.
=back
=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(3)|ssl(3)>,
L<SSL_get_client_CA_list(3)|SSL_get_client_CA_list(3)>,
L<SSL_load_client_CA_file(3)|SSL_load_client_CA_file(3)>,
L<SSL_CTX_load_verify_locations(3)|SSL_CTX_load_verify_locations(3)>
=cut
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