Updated: 2022/Sep/29

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SSL_load_client_CA_file(3)          OpenSSL         SSL_load_client_CA_file(3)



NAME
       SSL_load_client_CA_file_ex, SSL_load_client_CA_file,
       SSL_add_file_cert_subjects_to_stack,
       SSL_add_dir_cert_subjects_to_stack,
       SSL_add_store_cert_subjects_to_stack - load certificate names

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/ssl.h>

        STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
                                                        OSSL_LIB_CTX *libctx,
                                                        const char *propq);
        STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);

        int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                                const char *file);
        int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                               const char *dir);
        int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                                 const char *store);

DESCRIPTION
       SSL_load_client_CA_file_ex() reads certificates from file and returns a
       STACK_OF(X509_NAME) with the subject names found. The library context
       libctx and property query propq are used when fetching algorithms from
       providers.

       SSL_load_client_CA_file() is similar to SSL_load_client_CA_file_ex()
       but uses NULL for the library context libctx and property query propq.

       SSL_add_file_cert_subjects_to_stack() reads certificates from file, and
       adds their subject name to the already existing stack.

       SSL_add_dir_cert_subjects_to_stack() reads certificates from every file
       in the directory dir, and adds their subject name to the already
       existing stack.

       SSL_add_store_cert_subjects_to_stack() loads certificates from the
       store URI, and adds their subject name to the already existing stack.

NOTES
       SSL_load_client_CA_file() reads a file of PEM formatted certificates
       and extracts the X509_NAMES of the certificates found. While the name
       suggests the specific usage as support function for
       SSL_CTX_set_client_CA_list(3), it is not limited to CA certificates.

RETURN VALUES
       The following return values can occur:

       NULL
           The operation failed, check out the error stack for the reason.

       Pointer to STACK_OF(X509_NAME)
           Pointer to the subject names of the successfully read certificates.

EXAMPLES
       Load names of CAs from file and use it as a client CA list:

        SSL_CTX *ctx;
        STACK_OF(X509_NAME) *cert_names;

        ...
        cert_names = SSL_load_client_CA_file("/path/to/CAfile.pem");
        if (cert_names != NULL)
            SSL_CTX_set_client_CA_list(ctx, cert_names);
        else
            /* error */
        ...

SEE ALSO
       ssl(7), ossl_store(7), SSL_CTX_set_client_CA_list(3)

HISTORY
       SSL_load_client_CA_file_ex() and SSL_add_store_cert_subjects_to_stack()
       were added in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07        SSL_load_client_CA_file(3)