Replumbing: add a configuration module for providers

This configuration module supports a configuration structure pretty
much like the engine configuration module, i.e. something like this:

    openssl_conf = openssl_init

    [openssl_init]
    providers = provider_section

    [provider_section]
    # Configure the provider named "foo"
    foo = foo_section
    # Configure the provider named "bar"
    bar = bar_section

    [foo_section]
    # Override name given in the provider section
    identity = myfoo
    # The exact path of the module.  This is platform specific
    module_path = /opt/openssl/modules/foo.so
    # Whether it should be automatically activated.  Value is unimportant
    activate = whatever

    # Anything else goes as well, and becomes parameters that the
    # provider can get
    what = 1
    # sub-sections will be followed as well
    ever = ever_section

    [ever_section]
    cookie = monster

All the configurations in a provider section and its sub-sections
become parameters for the provider to get, i.e. the "foo" provider
will be able to get values for the following keys (with associated
values shown):

    identity            => myfoo
    module_path         => /opt/openssl/modules/foo.so
    activate            => whatever
    what                => 1
    ever.cookie         => monster

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8549)

1 files changed, 2 insertions, 0 deletions

diff --git a/crypto/conf/conf_mall.c b/crypto/conf/conf_mall.c
index e1d0e7aef3..28003a8fae 100644
--- a/crypto/conf/conf_mall.c
+++ b/crypto/conf/conf_mall.c
@@ -14,6 +14,7 @@
 #include <openssl/x509.h>
 #include <openssl/asn1.h>
 #include <openssl/engine.h>
+#include "internal/provider.h"
 #include "conf_lcl.h"
 
 /* Load all OpenSSL builtin modules */
@@ -28,4 +29,5 @@ void OPENSSL_load_builtin_modules(void)
 #endif
     EVP_add_alg_module();
     conf_add_ssl_module();
+    ossl_provider_add_conf_module();
 }