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openssl: Load "legacy" provider in OpenSSL 3 for algorithms like MD4, DES etc.

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We still require these algorithms for e.g. EAP-MSCHAPv2, so the option is
enabled, by default.  To use other providers (e.g. fips or even custom
ones), the option can be disabled and the providers to load/activate can
be configured in openssl.cnf.  For instance, the following has the same
effect as enabling the option:

    openssl_conf = openssl_init

    [openssl_init]
    providers = providers

    [providers]
    default = activate
    legacy = activate

    [activate]
    activate = yes
This commit is contained in:
Tobias Brunner 2021-09-30 09:41:57 +02:00
parent 8baa431501
commit f556fce16b
2 changed files with 38 additions and 0 deletions
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5
conf/plugins/openssl.opt
View File

@ -3,3 +3,8 @@ charon.plugins.openssl.engine_id = pkcs11
charon.plugins.openssl.fips_mode = 0
Set OpenSSL FIPS mode: disabled(0), enabled(1), Suite B enabled(2).
charon.plugins.openssl.load_legacy = yes
Load the legacy provider in OpenSSL 3+ for algorithms like MD4, DES, or
Blowfish (the first two are required for EAP-MSCHAPv2). If disabled, the
default provider is loaded, or those configured in the OpenSSL config.

33
src/libstrongswan/plugins/openssl/openssl_plugin.c
View File

@ -16,6 +16,7 @@
#include <library.h>
#include <utils/debug.h>
#include <collections/array.h>
#include <threading/thread.h>
#include <threading/mutex.h>
#include <threading/thread_value.h>
@ -31,6 +32,9 @@
#ifndef OPENSSL_NO_ECDH
#include <openssl/ec.h>
#endif
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#include <openssl/provider.h>
#endif
#include "openssl_plugin.h"
#include "openssl_util.h"
@ -70,6 +74,13 @@ struct private_openssl_plugin_t {
* public functions
*/
openssl_plugin_t public;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
/**
* Loaded providers
*/
array_t *providers;
#endif
};
/**
@ -876,6 +887,15 @@ METHOD(plugin_t, get_features, int,
METHOD(plugin_t, destroy, void,
private_openssl_plugin_t *this)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
OSSL_PROVIDER *provider;
while (array_remove(this->providers, ARRAY_TAIL, &provider))
{
OSSL_PROVIDER_unload(provider);
}
array_destroy(this->providers);
#endif /* OPENSSL_VERSION_NUMBER */
/* OpenSSL 1.1.0 cleans up itself at exit and while OPENSSL_cleanup() exists we
* can't call it as we couldn't re-initialize the library (as required by the
* unit tests and the Android app) */
@ -952,6 +972,19 @@ plugin_t *openssl_plugin_create()
#endif /* OPENSSL_NO_ENGINE */
#endif /* OPENSSL_VERSION_NUMBER */
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
if (lib->settings->get_bool(lib->settings, "%s.plugins.openssl.load_legacy",
TRUE, lib->ns))
{
/* load the legacy provider for algorithms like MD4, DES, BF etc. */
array_insert_create(&this->providers, ARRAY_TAIL,
OSSL_PROVIDER_load(NULL, "legacy"));
/* explicitly load the default provider, as mentioned by crypto(7) */
array_insert_create(&this->providers, ARRAY_TAIL,
OSSL_PROVIDER_load(NULL, "default"));
}
#endif /* OPENSSL_VERSION_NUMBER */
#ifdef OPENSSL_FIPS
/* we do this here as it may have been enabled via openssl.conf */
fips_mode = FIPS_mode();