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SSL_load_client_CA_file

Section: OpenSSL (3)
Updated: 2017-05-25
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NAME

SSL_load_client_CA_file - load certificate names from file

SYNOPSIS

 #include <openssl/ssl.h>

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

DESCRIPTION

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

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.

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_handling();
 ...

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.