EVP configuration section: add 'default_properties' command

The value of the 'default_properties' command is simply passed to
EVP_set_default_properties().

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8681)

2 files changed, 43 insertions, 8 deletions

diff --git a/crypto/evp/evp_cnf.c b/crypto/evp/evp_cnf.c
index f75ea675d3..7cfa0a27fe 100644
--- a/crypto/evp/evp_cnf.c
+++ b/crypto/evp/evp_cnf.c
@@ -13,9 +13,11 @@
 #include <openssl/conf.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
+#include <openssl/trace.h>
 
 /* Algorithm configuration module. */
 
+/* TODO(3.0): the config module functions should be passed a library context */
 static int alg_module_init(CONF_IMODULE *md, const CONF *cnf)
 {
     int i;
@@ -23,6 +25,9 @@ static int alg_module_init(CONF_IMODULE *md, const CONF *cnf)
     STACK_OF(CONF_VALUE) *sktmp;
     CONF_VALUE *oval;
 
+    OSSL_TRACE2(CONF, "Loading EVP module: name %s, value %s\n",
+                CONF_imodule_get_name(md), CONF_imodule_get_value(md));
+
     oid_section = CONF_imodule_get_value(md);
     if ((sktmp = NCONF_get_section(cnf, oid_section)) == NULL) {
         EVPerr(EVP_F_ALG_MODULE_INIT, EVP_R_ERROR_LOADING_SECTION);
@@ -32,18 +37,26 @@ static int alg_module_init(CONF_IMODULE *md, const CONF *cnf)
         oval = sk_CONF_VALUE_value(sktmp, i);
         if (strcmp(oval->name, "fips_mode") == 0) {
             int m;
+
             if (!X509V3_get_value_bool(oval, &m)) {
                 EVPerr(EVP_F_ALG_MODULE_INIT, EVP_R_INVALID_FIPS_MODE);
                 return 0;
             }
-            if (m > 0) {
-                EVPerr(EVP_F_ALG_MODULE_INIT, EVP_R_FIPS_MODE_NOT_SUPPORTED);
-                return 0;
-            }
+            /*
+             * fips_mode is deprecated and should not be used in new
+             * configurations.  Old configurations are likely to ONLY
+             * have this, so we assume that no default properties have
+             * been set before this.
+             */
+            if (m > 0)
+                EVP_set_default_properties(NULL, "fips=yes");
+        } else if (strcmp(oval->name, "default_properties") == 0) {
+            EVP_set_default_properties(NULL, oval->value);
         } else {
             EVPerr(EVP_F_ALG_MODULE_INIT, EVP_R_UNKNOWN_OPTION);
             ERR_add_error_data(4, "name=", oval->name,
                                ", value=", oval->value);
+            return 0;
         }
 
     }
@@ -52,5 +65,6 @@ static int alg_module_init(CONF_IMODULE *md, const CONF *cnf)
 
 void EVP_add_alg_module(void)
 {
+    OSSL_TRACE(CONF, "Adding config module 'alg_section'\n");
     CONF_module_add("alg_section", alg_module_init, 0);
 }
diff --git a/doc/man5/config.pod b/doc/man5/config.pod
index 985b07ff3b..cac4ef6742 100644
--- a/doc/man5/config.pod
+++ b/doc/man5/config.pod
@@ -274,12 +274,33 @@ available to the provider.
 
 =head2 EVP Configuration Module
 
-This modules has the name B<alg_section> which points to a section containing
+This module has the name B<alg_section> which points to a section containing
 algorithm commands.
 
-Currently the only algorithm command supported is B<fips_mode> whose
-value can only be the boolean string B<off>. If B<fips_mode> is set to B<on>,
-an error occurs as this library version is not FIPS capable.
+The supported algorithm commands are:
+
+=over 4
+
+=item B<default_properties>
+
+The value may be anything that is acceptable as a property query
+string for EVP_set_default_properties().
+
+=item B<fips_mode> (deprecated)
+
+The value is a boolean that can be B<yes> or B<no>.  If the value is
+B<yes>, this is exactly equivalent to:
+
+    default_properties = fips=yes
+
+If the value is B<no>, nothing happens.
+
+=back
+
+These two commands should not be used together, as there is no control
+over how they affect each other.
+The use of B<fips_mode> is strongly discouraged and is only present
+for backward compatibility with earlier OpenSSL FIPS modules.
 
 =head2 SSL Configuration Module