NAME

       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

SYNOPSIS

        #include <openssl/ssl.h>

        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);

DESCRIPTION

       SSL_CTX_set0_CA_list() sets the list of CAs to be sent to the peer to name_list. Ownership
       of name_list is transferred to 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 name_list overriding any
       list set in the parent SSL_CTX of s. Ownership of name_list is transferred to s and it
       should not be freed by the caller.

       SSL_CTX_get0_CA_list() retrieves any previously set list of CAs set for ctx.

       SSL_CTX_get0_CA_list() retrieves any previously set list of CAs set for s or if none are
       set the list from the parent SSL_CTX is retrieved.

       SSL_CTX_add1_to_CA_list() appends the CA subject name extracted from x to the list of CAs
       sent to peer for ctx.

       SSL_add1_to_CA_list() appends the CA subject name extracted from x to the list of CAs sent
       to the peer for s, overriding the setting in the parent SSL_CTX.

       SSL_get0_peer_CA_list() retrieves the list of CA names (if any) the peer has sent.

NOTES

       These functions are generalised versions of the client authentication CA list functions
       such as SSL_CTX_set_client_CA_list(3).

       For TLS versions before 1.3 the list of CA names is only sent from the server to 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
       NULL.

       For TLS 1.3 the list of CA names is sent using the certificate_authorities extension and
       will be sent by a client (in the ClientHello message) or by a server (when requesting a
       certificate).

RETURN VALUES

       SSL_CTX_set0_CA_list() and SSL_set0_CA_list() do not return a value.

       SSL_CTX_get0_CA_list() and SSL_get0_CA_list() return a stack of CA names or NULL is no CA
       names are set.

       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 NULL or an empty
       stack if no list was sent.

SEE ALSO

       ssl(7), SSL_CTX_set_client_CA_list(3), SSL_get_client_CA_list(3),
       SSL_load_client_CA_file(3), SSL_CTX_load_verify_locations(3)

COPYRIGHT

       Copyright 2017-2018 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 <https://www.openssl.org/source/license.html>.