SSL_CTX_set_client_CA_list(3)

     SSL_CTX_set_client_CA_l0.9.6h (2001-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

     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_ooppttiioonnss(())), 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.

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     SSL_CTX_set_client_CA_l0.9.6h (2001-SSL_CTX_set_client_CA_list(3)

          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:

          1   The operation succeeded.

          o   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.

     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)

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