Document the default CA path functions

[openssl.git] / doc / ssl / SSL_CTX_load_verify_locations.pod

diff --git a/doc/ssl/SSL_CTX_load_verify_locations.pod b/doc/ssl/SSL_CTX_load_verify_locations.pod
index 8e11606dadebeffd8a1fc5a32c8687e625618693..de388d3b50de77ba74cf6fabe8ef8e92d57e8048 100644 (file)
--- a/doc/ssl/SSL_CTX_load_verify_locations.pod
+++ b/doc/ssl/SSL_CTX_load_verify_locations.pod
@@ -12,12 +12,30 @@ certificates
  int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                    const char *CApath);
 
+ 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);
+
 =head1 DESCRIPTION
 
 SSL_CTX_load_verify_locations() specifies the locations for B<ctx>, at
 which CA certificates for verification purposes are located. The certificates
 available via B<CAfile> and B<CApath> are trusted.
 
+SSL_CTX_set_default_verify_paths() specifies that the default locations for
+which CA certificates are loaded should be used. There is one default directory
+and one default file.
+
+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
+used.
+
 =head1 NOTES
 
 If B<CAfile> is not NULL, it points to a file of CA certificates in PEM
@@ -33,10 +51,6 @@ which can be used e.g. for descriptions of the certificates.
 The B<CAfile> is processed on execution of the SSL_CTX_load_verify_locations()
 function.
 
-If on an TLS/SSL server no special setting is perfomed using *client_CA_list()
-functions, the certificates contained in B<CAfile> are listed to the client
-as available CAs during the TLS/SSL handshake.
-
 If B<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.
@@ -50,9 +64,6 @@ The certificates in B<CApath> are only looked up when required, e.g. when
 building the certificate chain or when actually performing the verification
 of a peer certificate.
 
-On a server, the certificates in B<CApath> are not listed as available
-CA certificates to a client during a TLS/SSL handshake.
-
 When looking up CA certificates, the OpenSSL library will first search the
 certificates in B<CAfile>, then those in B<CApath>. Certificate matching
 is done based on the subject name, the key identifier (if present), and the
@@ -62,8 +73,18 @@ matching the parameters is found, the verification process will be performed;
 no other certificates for the same parameters will be searched in case of
 failure.
 
+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 B<CAfile> or B<CApath> and must
+explicitly be set using the
+L<SSL_CTX_set_client_CA_list(3)>
+family of functions.
+
 When building its own certificate chain, an OpenSSL client/server will
-try to fill in missing certificates from B<CAfile>/B<CApath>.
+try to fill in missing certificates from B<CAfile>/B<CApath>, if the
+certificate chain was not explicitly specified (see
+L<SSL_CTX_add_extra_chain_cert(3)>,
+L<SSL_CTX_use_certificate(3)>.
 
 =head1 WARNINGS
 
@@ -93,26 +114,33 @@ for use as B<CApath>:
 
 =head1 RETURN VALUES
 
-The following return values can occur:
+For SSL_CTX_load_verify_locations the following return values can occur:
 
 =over 4
 
-=item 0
+=item Z<>0
 
 The operation failed because B<CAfile> and B<CApath> are NULL or the
 processing at one of the locations specified failed. Check the error
 stack to find out the reason.
 
-=item 1
+=item Z<>1
 
 The operation succeeded.
 
 =back
 
+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.
+
 =head1 SEE ALSO
 
-L<ssl(3)|ssl(3)>,
-L<SSL_CTX_set_client_CA_list(3)|SSL_CTX_set_client_CA_list(3)>,
-L<SSL_get_client_CA_list(3)|SSL_get_client_CA_list(3)>
+L<ssl(3)>,
+L<SSL_CTX_set_client_CA_list(3)>,
+L<SSL_get_client_CA_list(3)>,
+L<SSL_CTX_use_certificate(3)>,
+L<SSL_CTX_add_extra_chain_cert(3)>,
+L<SSL_CTX_set_cert_store(3)>
 
 =cut