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SSL_CTX_set_client_CA_list(3) OpenSSL SSL_CTX_set_client_CA_list(3) 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 LIBRARY libcrypto, -lcrypto 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); DESCRIPTION SSL_CTX_set_client_CA_list() sets the list of CAs sent to the client when requesting a client certificate for ctx. SSL_set_client_CA_list() sets the list of CAs sent to the client when requesting a client certificate for the chosen ssl, overriding the setting valid for ssl's SSL_CTX object. SSL_CTX_add_client_CA() adds the CA name extracted from cacert to the list of CAs sent to the client when requesting a client certificate for ctx. SSL_add_client_CA() adds the CA name extracted from cacert to the list of CAs sent to the client when requesting a client certificate for the chosen ssl, overriding the setting valid for ssl's SSL_CTX object. NOTES When a TLS/SSL server requests a client certificate (see SSSSLL__CCTTXX__sseett__vveerriiffyy(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 ctx and SSL_set_client_CA_list() for the specific ssl. The list specified overrides the previous setting. The CAs listed do not become trusted (list only contains the names, not the complete certificates); use SSL_CTX_load_verify_locations(3) to additionally load them for verification. If the list of acceptable CAs is compiled in a file, the 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 ctx or ssl (as appropriate) is opened. These functions are only useful for TLS/SSL servers. 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: 0 A failure while manipulating the STACK_OF(X509_NAME) object occurred or the X509_NAME could not be extracted from cacert. Check the error stack to find out the reason. 1 The operation succeeded. EXAMPLES Scan all certificates in CAfile and list them as acceptable CAs: SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile)); SEE ALSO ssl(3), SSL_get_client_CA_list(3), SSL_load_client_CA_file(3), SSL_CTX_load_verify_locations(3) 1.0.1u 2014-08-10 SSL_CTX_set_client_CA_list(3)