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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set_client_CA_list()\fR sets the \fBlist\fR of CAs sent to the client when requesting a client certificate for \fBctx\fR. .PP \&\fBSSL_set_client_CA_list()\fR sets the \fBlist\fR of CAs sent to the client when requesting a client certificate for the chosen \fBssl\fR, overriding the setting valid for \fBssl\fR's \s-1SSL_CTX\s0 object. .PP \&\fBSSL_CTX_add_client_CA()\fR adds the \s-1CA\s0 name extracted from \fBcacert\fR to the list of CAs sent to the client when requesting a client certificate for \&\fBctx\fR. .PP \&\fBSSL_add_client_CA()\fR adds the \s-1CA\s0 name extracted from \fBcacert\fR to the list of CAs sent to the client when requesting a client certificate for the chosen \fBssl\fR, overriding the setting valid for \fBssl\fR's \s-1SSL_CTX\s0 object. .SH "NOTES" .IX Header "NOTES" When a \s-1TLS/SSL\s0 server requests a client certificate (see \&\fB\fBSSL_CTX_set_verify\fB\\|(3)\fR), it sends a list of CAs, for which it will accept certificates, to the client. .PP This list must explicitly be set using \fBSSL_CTX_set_client_CA_list()\fR for \&\fBctx\fR and \fBSSL_set_client_CA_list()\fR for the specific \fBssl\fR. The list specified overrides the previous setting. The CAs listed do not become trusted (\fBlist\fR only contains the names, not the complete certificates); use \&\fBSSL_CTX_load_verify_locations\fR\\|(3) to additionally load them for verification. .PP If the list of acceptable CAs is compiled in a file, the \&\fBSSL_load_client_CA_file\fR\\|(3) function can be used to help importing the necessary data. .PP \&\fBSSL_CTX_add_client_CA()\fR and \fBSSL_add_client_CA()\fR can be used to add additional items the list of client CAs. If no list was specified before using \&\fBSSL_CTX_set_client_CA_list()\fR or \fBSSL_set_client_CA_list()\fR, a new client \&\s-1CA\s0 list for \fBctx\fR or \fBssl\fR (as appropriate) is opened. .PP These functions are only useful for \s-1TLS/SSL\s0 servers. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_CTX_set_client_CA_list()\fR and \fBSSL_set_client_CA_list()\fR do not return diagnostic information. .PP \&\fBSSL_CTX_add_client_CA()\fR and \fBSSL_add_client_CA()\fR have the following return values: .IP "0" 4 A failure while manipulating the \s-1STACK_OF\s0(X509_NAME) object occurred or the X509_NAME could not be extracted from \fBcacert\fR. Check the error stack to find out the reason. .IP "1" 4 .IX Item "1" The operation succeeded. .SH "EXAMPLES" .IX Header "EXAMPLES" Scan all certificates in \fBCAfile\fR and list them as acceptable CAs: .PP .Vb 1 \& SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile)); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(3), \&\fBSSL_get_client_CA_list\fR\\|(3), \&\fBSSL_load_client_CA_file\fR\\|(3), \&\fBSSL_CTX_load_verify_locations\fR\\|(3)

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