SSL configuration module docs

Reviewed-by: Richard Levitte <levitte@openssl.org>

doc/apps/config.pod

@@ -208,6 +208,34 @@ For example:
 
  fips_mode = on
 
+=head2 SSL CONFIGURATION MODULE
+
+This module has the name B<ssl_conf> which points to a section containing
+SSL configurations.
+
+Each line in the SSL configuration section contains the name of the
+configuration and the section containing it.
+
+Each configuration section consists of command value pairs for B<SSL_CONF>.
+Each pair will be passed to a B<SSL_CTX> or B<SSL> structure if it calls
+SSL_CTX_config() or SSL_config() with the appropriate configuration name.
+
+Note: any characters before an initial dot in the configuration section are
+ignored so the same command can be used multiple times.
+
+For example:
+
+ ssl_conf = ssl_sect
+
+ [ssl_sect]
+
+ server = server_section
+
+ [server_section]
+
+ RSA.Certificate = server-rsa.pem
+ ECDSA.Certificate = server-ecdsa.pem
+ Ciphers = ALL:!RC4
 
 =head1 NOTES
 

doc/ssl/SSL_CTX_config.pod

@@ -0,0 +1,84 @@
+=pod
+
+=head1 NAME
+
+SSL_CTX_config, SSL_config - configure SSL_CTX or SSL structure.
+
+=head1 SYNOPSIS
+
+ #include <openssl/ssl.h>
+
+ int SSL_CTX_config(SSL_CTX *ctx, const char *name);
+ int SSL_config(SSL *s, const char *name);
+
+=head1 DESCRIPTION
+
+The functions SSL_CTX_config() and SSL_config() configure an B<SSL_CTX> or
+B<SSL> structure using the configuration B<name>.
+
+=head1 NOTES
+
+By calling SSL_CTX_config() or SSL_config() an application can perform many
+complex tasks based on the contents of the configuration file: greatly
+simplifying application configuration code. A degree of future proofing
+can also be achieved: an application can support configuration features
+in newer versions of OpenSSL automatically.
+
+A configuration file must have been previously loaded, for example using
+CONF_modules_load_file(). See L<config(3)> for details of the configuration
+file syntax.
+
+=head1 RETURN VALUES
+
+SSL_CTX_config() and SSL_config() return 1 for success or 0 if an error
+occurred.
+
+=head1 EXAMPLE
+
+If the file "config.cnf" contains the following:
+
+ testapp = test_sect
+
+ [test_sect]
+ # list of confuration modules
+
+ ssl_conf = ssl_sect
+
+ [ssl_sect]
+
+ server = server_section
+
+ [server_section]
+
+ RSA.Certificate = server-rsa.pem
+ ECDSA.Certificate = server-ecdsa.pem
+ Ciphers = ALL:!RC4
+
+An application could call:
+
+ if (CONF_modules_load_file("config.cnf", "testapp", 0) <= 0) {
+      fprintf(stderr, "Error processing config file\n");
+      goto err;
+ }
+
+ ctx = SSL_CTX_new(TLS_server_method());
+
+ if (SSL_CTX_config(ctx, "server") == 0) {
+     fprintf(stderr, "Error configuring server.\n");
+     goto err;
+ }
+
+In this example two certificates and the cipher list are configured without
+the need for any additional application code.
+
+=head1 SEE ALSO
+
+L<config(3)>,
+L<SSL_CONF_cmd(3)>,
+L<CONF_modules_load_file(3)>
+
+=head1 HISTORY
+
+SSL_CTX_config() and SSL_config() were first added to OpenSSL 1.1.0
+
+=cut