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.\" ========================================================================
.\"
.IX Title "SSL_CTX_set_client_CA_list 3"
.TH SSL_CTX_set_client_CA_list 3 "2012-05-10" "0.9.8x" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.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"
\&\fISSL_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
\&\fISSL_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
\&\fISSL_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
\&\fISSL_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\f(BISSL_CTX_set_verify_options()\fB\fR), it sends a list of CAs, for which
it will accept certificates, to the client.
.PP
This list must explicitly be set using \fISSL_CTX_set_client_CA_list()\fR for
\&\fBctx\fR and \fISSL_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
\&\fISSL_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
\&\fISSL_load_client_CA_file\fR\|(3)
function can be used to help importing the necessary data.
.PP
\&\fISSL_CTX_add_client_CA()\fR and \fISSL_add_client_CA()\fR can be used to add additional
items the list of client CAs. If no list was specified before using
\&\fISSL_CTX_set_client_CA_list()\fR or \fISSL_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"
\&\fISSL_CTX_set_client_CA_list()\fR and \fISSL_set_client_CA_list()\fR do not return
diagnostic information.
.PP
\&\fISSL_CTX_add_client_CA()\fR and \fISSL_add_client_CA()\fR have the following return
values:
.IP "1." 4
The operation succeeded.
.IP "2." 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.
.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"
\&\fIssl\fR\|(3),
\&\fISSL_get_client_CA_list\fR\|(3),
\&\fISSL_load_client_CA_file\fR\|(3),
\&\fISSL_CTX_load_verify_locations\fR\|(3)
.SH "POD ERRORS"
.IX Header "POD ERRORS"
Hey! \fBThe above document had some coding errors, which are explained below:\fR
.IP "Around line 73:" 4
.IX Item "Around line 73:"
You have '=item 0' instead of the expected '=item 2'