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       SSL_CTX_load_verify_dir,	SSL_CTX_load_verify_file,
       SSL_CTX_load_verify_store, SSL_CTX_set_default_verify_paths,
       SSL_CTX_set_default_verify_dir, SSL_CTX_set_default_verify_file,
       SSL_CTX_set_default_verify_store, SSL_CTX_load_verify_locations - set
       default locations for trusted CA	certificates

	#include <openssl/ssl.h>

	int SSL_CTX_load_verify_dir(SSL_CTX *ctx, const	char *CApath);
	int SSL_CTX_load_verify_file(SSL_CTX *ctx, const char *CAfile);
	int SSL_CTX_load_verify_store(SSL_CTX *ctx, const char *CAstore);

	int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx);

	int SSL_CTX_set_default_verify_dir(SSL_CTX *ctx);
	int SSL_CTX_set_default_verify_file(SSL_CTX *ctx);
	int SSL_CTX_set_default_verify_store(SSL_CTX *ctx);

	int SSL_CTX_load_verify_locations(SSL_CTX *ctx,	const char *CAfile,
					  const	char *CApath);

       SSL_CTX_load_verify_locations(),	SSL_CTX_load_verify_dir(),
       SSL_CTX_load_verify_file(), SSL_CTX_load_verify_store() specifies the
       locations for ctx, at which CA certificates for verification purposes
       are located. The	certificates available via CAfile, CApath and CAstore
       are trusted.

       Details of the certificate verification and chain checking process are
       described in "Certification Path	Validation" in

       SSL_CTX_set_default_verify_paths() specifies that the default locations
       from which CA certificates are loaded should be used. There is one
       default directory, one default file and one default store.  The default
       CA certificates directory is called certs in the	default	OpenSSL
       directory, and this is also the default store.  Alternatively the
       SSL_CERT_DIR environment	variable can be	defined	to override this
       location.  The default CA certificates file is called cert.pem in the
       default OpenSSL directory.  Alternatively the SSL_CERT_FILE environment
       variable	can be defined to override this	location.

       SSL_CTX_set_default_verify_dir()	is similar to
       SSL_CTX_set_default_verify_paths() except that just the default
       directory is used.

       SSL_CTX_set_default_verify_file() is similar to
       SSL_CTX_set_default_verify_paths() except that just the default file is

       SSL_CTX_set_default_verify_store() is similar to
       SSL_CTX_set_default_verify_paths() except that just the default store
       is used.

       If CAfile is not	NULL, it points	to a file of CA	certificates in	PEM
       format. The file	can contain several CA certificates identified by

	... (CA	certificate in base64 encoding)	...

       sequences. Before, between, and after the certificates text is allowed
       which can be used e.g. for descriptions of the certificates.

       The CAfile is processed on execution of the
       SSL_CTX_load_verify_locations() function.

       If CApath is not	NULL, it points	to a directory containing CA
       certificates in PEM format. The files each contain one CA certificate.
       The files are looked up by the CA subject name hash value, which	must
       hence be	available.  If more than one CA	certificate with the same name
       hash value exist, the extension must be different (e.g. 9d66eef0.0,
       9d66eef0.1 etc).	The search is performed	in the ordering	of the
       extension number, regardless of other properties	of the certificates.
       Use the c_rehash	utility	to create the necessary	links.

       The certificates	in CApath are only looked up when required, e.g. when
       building	the certificate	chain or when actually performing the
       verification of a peer certificate.

       When looking up CA certificates for chain building, the OpenSSL library
       will search for suitable	certificates first in CAfile, then in CApath.
       Details of the chain building process are described in "Certification
       Path Building" in openssl-verification-options(1).

       If CAstore is not NULL, it's a URI for to a store, which	may represent
       a single	container or a whole catalogue of containers.  Apart from the
       CAstore not necessarily being a local file or directory,	it's generally
       treated the same	way as a CApath.

       In server mode, when requesting a client	certificate, the server	must
       send the	list of	CAs of which it	will accept client certificates. This
       list is not influenced by the contents of CAfile	or CApath and must
       explicitly be set using the SSL_CTX_set_client_CA_list(3) family	of

       When building its own certificate chain,	an OpenSSL client/server will
       try to fill in missing certificates from	CAfile/CApath, if the
       certificate chain was not explicitly specified (see
       SSL_CTX_add_extra_chain_cert(3),	SSL_CTX_use_certificate(3).

       If several CA certificates matching the name, key identifier, and
       serial number condition are available, only the first one will be
       examined. This may lead to unexpected results if	the same CA
       certificate is available	with different expiration dates. If a
       "certificate expired" verification error	occurs,	no other certificate
       will be searched. Make sure to not have expired certificates mixed with
       valid ones.

       For SSL_CTX_load_verify_locations the following return values can

       0   The operation failed	because	CAfile and CApath are NULL or the
	   processing at one of	the locations specified	failed.	Check the
	   error stack to find out the reason.

       1   The operation succeeded.

       SSL_CTX_set_default_verify_paths(), SSL_CTX_set_default_verify_dir()
       and SSL_CTX_set_default_verify_file() all return	1 on success or	0 on
       failure.	A missing default location is still treated as a success.

       Generate	a CA certificate file with descriptive text from the CA
       certificates ca1.pem ca2.pem ca3.pem:

	rm CAfile.pem
	for i in ca1.pem ca2.pem ca3.pem ; do
	    openssl x509 -in $i	-text >> CAfile.pem

       Prepare the directory /some/where/certs containing several CA
       certificates for	use as CApath:

	cd /some/where/certs
	c_rehash .

       ssl(7), SSL_CTX_set_client_CA_list(3), SSL_get_client_CA_list(3),
       SSL_CTX_use_certificate(3), SSL_CTX_add_extra_chain_cert(3),
       SSL_CTX_set_cert_store(3), SSL_CTX_set_client_CA_list(3)

       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

3.0.0+quic			  2021-09-SSL_CTX_LOAD_VERIFY_LOCATIONS(3ossl)


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