1=pod 2 3=head1 NAME 4 5SSL_CTX_set_client_CA_list, SSL_set_client_CA_list, SSL_CTX_add_client_CA, 6SSL_add_client_CA - set list of CAs sent to the client when requesting a 7client certificate 8 9=head1 SYNOPSIS 10 11 #include <openssl/ssl.h> 12 13 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *list); 14 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *list); 15 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *cacert); 16 int SSL_add_client_CA(SSL *ssl, X509 *cacert); 17 18=head1 DESCRIPTION 19 20SSL_CTX_set_client_CA_list() sets the B<list> of CAs sent to the client when 21requesting a client certificate for B<ctx>. 22 23SSL_set_client_CA_list() sets the B<list> of CAs sent to the client when 24requesting a client certificate for the chosen B<ssl>, overriding the 25setting valid for B<ssl>'s SSL_CTX object. 26 27SSL_CTX_add_client_CA() adds the CA name extracted from B<cacert> to the 28list of CAs sent to the client when requesting a client certificate for 29B<ctx>. 30 31SSL_add_client_CA() adds the CA name extracted from B<cacert> to the 32list of CAs sent to the client when requesting a client certificate for 33the chosen B<ssl>, overriding the setting valid for B<ssl>'s SSL_CTX object. 34 35=head1 NOTES 36 37When a TLS/SSL server requests a client certificate (see 38B<SSL_CTX_set_verify_options()>), it sends a list of CAs, for which 39it will accept certificates, to the client. 40 41This list must explicitly be set using SSL_CTX_set_client_CA_list() for 42B<ctx> and SSL_set_client_CA_list() for the specific B<ssl>. The list 43specified overrides the previous setting. The CAs listed do not become 44trusted (B<list> only contains the names, not the complete certificates); use 45L<SSL_CTX_load_verify_locations(3)|SSL_CTX_load_verify_locations(3)> 46to additionally load them for verification. 47 48If the list of acceptable CAs is compiled in a file, the 49L<SSL_load_client_CA_file(3)|SSL_load_client_CA_file(3)> 50function can be used to help importing the necessary data. 51 52SSL_CTX_add_client_CA() and SSL_add_client_CA() can be used to add additional 53items the list of client CAs. If no list was specified before using 54SSL_CTX_set_client_CA_list() or SSL_set_client_CA_list(), a new client 55CA list for B<ctx> or B<ssl> (as appropriate) is opened. 56 57These functions are only useful for TLS/SSL servers. 58 59=head1 RETURN VALUES 60 61SSL_CTX_set_client_CA_list() and SSL_set_client_CA_list() do not return 62diagnostic information. 63 64SSL_CTX_add_client_CA() and SSL_add_client_CA() have the following return 65values: 66 67=over 4 68 69=item 1 70 71The operation succeeded. 72 73=item 0 74 75A failure while manipulating the STACK_OF(X509_NAME) object occurred or 76the X509_NAME could not be extracted from B<cacert>. Check the error stack 77to find out the reason. 78 79=back 80 81=head1 EXAMPLES 82 83Scan all certificates in B<CAfile> and list them as acceptable CAs: 84 85 SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile)); 86 87=head1 SEE ALSO 88 89L<ssl(3)|ssl(3)>, 90L<SSL_get_client_CA_list(3)|SSL_get_client_CA_list(3)>, 91L<SSL_load_client_CA_file(3)|SSL_load_client_CA_file(3)>, 92L<SSL_CTX_load_verify_locations(3)|SSL_CTX_load_verify_locations(3)> 93 94=cut 95