1SSL_CTX_set_client_CA_list(3)       OpenSSL      SSL_CTX_set_client_CA_list(3)
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NAME

6       SSL_CTX_set_client_CA_list, SSL_set_client_CA_list,
7       SSL_CTX_add_client_CA, SSL_add_client_CA - set list of CAs sent to the
8       client when requesting a client certificate
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SYNOPSIS

11        #include <openssl/ssl.h>
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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);
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DESCRIPTION

19       SSL_CTX_set_client_CA_list() sets the list of CAs sent to the client
20       when requesting a client certificate for ctx.
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22       SSL_set_client_CA_list() sets the list of CAs sent to the client when
23       requesting a client certificate for the chosen ssl, overriding the
24       setting valid for ssl's SSL_CTX object.
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26       SSL_CTX_add_client_CA() adds the CA name extracted from cacert to the
27       list of CAs sent to the client when requesting a client certificate for
28       ctx.
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30       SSL_add_client_CA() adds the CA name extracted from cacert to the list
31       of CAs sent to the client when requesting a client certificate for the
32       chosen ssl, overriding the setting valid for ssl's SSL_CTX object.
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NOTES

35       When a TLS/SSL server requests a client certificate (see
36       SSL_CTX_set_verify_options()), it sends a list of CAs, for which it
37       will accept certificates, to the client.
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39       This list must explicitly be set using SSL_CTX_set_client_CA_list() for
40       ctx and SSL_set_client_CA_list() for the specific ssl. The list
41       specified overrides the previous setting. The CAs listed do not become
42       trusted (list only contains the names, not the complete certificates);
43       use SSL_CTX_load_verify_locations(3) to additionally load them for
44       verification.
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46       If the list of acceptable CAs is compiled in a file, the
47       SSL_load_client_CA_file(3) function can be used to help importing the
48       necessary data.
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50       SSL_CTX_add_client_CA() and SSL_add_client_CA() can be used to add
51       additional items the list of client CAs. If no list was specified
52       before using SSL_CTX_set_client_CA_list() or SSL_set_client_CA_list(),
53       a new client CA list for ctx or ssl (as appropriate) is opened.
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55       These functions are only useful for TLS/SSL servers.
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RETURN VALUES

58       SSL_CTX_set_client_CA_list() and SSL_set_client_CA_list() do not return
59       diagnostic information.
60
61       SSL_CTX_add_client_CA() and SSL_add_client_CA() have the following
62       return values:
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64       0   A failure while manipulating the STACK_OF(X509_NAME) object
65           occurred or the X509_NAME could not be extracted from cacert. Check
66           the error stack to find out the reason.
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68       1   The operation succeeded.
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EXAMPLES

71       Scan all certificates in CAfile and list them as acceptable CAs:
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73         SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile));
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SEE ALSO

76       ssl(3), SSL_get_client_CA_list(3), SSL_load_client_CA_file(3),
77       SSL_CTX_load_verify_locations(3)
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811.0.1e                            2017-03-22     SSL_CTX_set_client_CA_list(3)