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SSL_LOAD_CLIENT_CA_FILE(3) Library Functions Manual SSL_LOAD_CLIENT_CA_FILE(3)

SSL_load_client_CA_fileload certificate names from file

#include <openssl/ssl.h>

STACK_OF(X509_NAME) *
SSL_load_client_CA_file(const char *file);

() reads certificates from file and returns a STACK_OF(X509_NAME) with the subject names found.

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.

The following return values can occur:

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.

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_handling();
...

ssl(3), SSL_CTX_set_client_CA_list(3)

December 2, 2014 OpenBSD-5.9