SSL_load_client_CA_file3ssl

Usage

 #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);

Overview

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 for SSL_load_client_CA_file_ex(), and SSL_load_client_CA_file():

The following return values can occur for SSL_add_file_cert_subjects_to_stack(), SSL_add_dir_cert_subjects_to_stack(), and SSL_add_store_cert_subjects_to_stack():

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 */
 ...