serialisation: Add a built-in base provider.

Move the libcrypto serialisation functionality into a place where it can
be provided at some point. The serialisation still remains native in the
default provider.

Add additional code to the list command to display what kind of serialisation
each entry is capable of.

Having the FIPS provider auto load the base provider is a future
(but necessary) enhancement.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12104)

1 files changed, 153 insertions, 0 deletions

diff --git a/providers/baseprov.c b/providers/baseprov.c
new file mode 100644
index 0000000000..d40535bafa
--- /dev/null
+++ b/providers/baseprov.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <openssl/opensslconf.h>
+#include <openssl/core.h>
+#include <openssl/core_dispatch.h>
+#include <openssl/core_names.h>
+#include <openssl/params.h>
+#include "prov/bio.h"
+#include "prov/provider_ctx.h"
+#include "prov/providercommon.h"
+#include "prov/implementations.h"
+#include "prov/provider_util.h"
+#include "internal/nelem.h"
+
+/*
+ * Forward declarations to ensure that interface functions are correctly
+ * defined.
+ */
+static OSSL_FUNC_provider_gettable_params_fn base_gettable_params;
+static OSSL_FUNC_provider_get_params_fn base_get_params;
+static OSSL_FUNC_provider_query_operation_fn base_query;
+
+/* Functions provided by the core */
+static OSSL_FUNC_core_gettable_params_fn *c_gettable_params = NULL;
+static OSSL_FUNC_core_get_params_fn *c_get_params = NULL;
+
+/* Parameters we provide to the core */
+static const OSSL_PARAM base_param_types[] = {
+    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_NAME, OSSL_PARAM_UTF8_PTR, NULL, 0),
+    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_VERSION, OSSL_PARAM_UTF8_PTR, NULL, 0),
+    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_BUILDINFO, OSSL_PARAM_UTF8_PTR, NULL, 0),
+    OSSL_PARAM_END
+};
+
+static const OSSL_PARAM *base_gettable_params(void *provctx)
+{
+    return base_param_types;
+}
+
+static int base_get_params(void *provctx, OSSL_PARAM params[])
+{
+    OSSL_PARAM *p;
+
+    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_NAME);
+    if (p != NULL
+            && !OSSL_PARAM_set_utf8_ptr(p, "OpenSSL Base Provider"))
+        return 0;
+    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_VERSION);
+    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR))
+        return 0;
+    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_BUILDINFO);
+    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_FULL_VERSION_STR))
+        return 0;
+
+    return 1;
+}
+
+static const OSSL_ALGORITHM base_serializer[] = {
+#define SER(name, fips, format, type, func_table)                           \
+    { name,                                                                 \
+      "provider=base,fips=" fips ",format=" format ",type=" type,           \
+      (func_table) }
+
+#include "serializers.inc"
+    { NULL, NULL, NULL }
+};
+#undef SER
+
+static const OSSL_ALGORITHM *base_query(void *provctx, int operation_id,
+                                         int *no_cache)
+{
+    *no_cache = 0;
+    return operation_id == OSSL_OP_SERIALIZER ? base_serializer : NULL;
+}
+
+static void base_teardown(void *provctx)
+{
+    BIO_meth_free(PROV_CTX_get0_core_bio_method(provctx));
+    PROV_CTX_free(provctx);
+}
+
+/* Functions we provide to the core */
+static const OSSL_DISPATCH base_dispatch_table[] = {
+    { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))base_teardown },
+    { OSSL_FUNC_PROVIDER_GETTABLE_PARAMS,
+      (void (*)(void))base_gettable_params },
+    { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))base_get_params },
+    { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))base_query },
+    { 0, NULL }
+};
+
+OSSL_provider_init_fn ossl_base_provider_init;
+
+int ossl_base_provider_init(const OSSL_CORE_HANDLE *handle,
+                            const OSSL_DISPATCH *in, const OSSL_DISPATCH **out,
+                            void **provctx)
+{
+    OSSL_FUNC_core_get_library_context_fn *c_get_libctx = NULL;
+    BIO_METHOD *corebiometh;
+
+    if (!ossl_prov_bio_from_dispatch(in))
+        return 0;
+    for (; in->function_id != 0; in++) {
+        switch (in->function_id) {
+        case OSSL_FUNC_CORE_GETTABLE_PARAMS:
+            c_gettable_params = OSSL_FUNC_core_gettable_params(in);
+            break;
+        case OSSL_FUNC_CORE_GET_PARAMS:
+            c_get_params = OSSL_FUNC_core_get_params(in);
+            break;
+        case OSSL_FUNC_CORE_GET_LIBRARY_CONTEXT:
+            c_get_libctx = OSSL_FUNC_core_get_library_context(in);
+            break;
+        default:
+            /* Just ignore anything we don't understand */
+            break;
+        }
+    }
+
+    if (c_get_libctx == NULL)
+        return 0;
+
+    /*
+     * We want to make sure that all calls from this provider that requires
+     * a library context use the same context as the one used to call our
+     * functions.  We do that by passing it along in the provider context.
+     *
+     * This only works for built-in providers.  Most providers should
+     * create their own library context.
+     */
+    if ((*provctx = PROV_CTX_new()) == NULL
+            || (corebiometh = bio_prov_init_bio_method()) == NULL) {
+        PROV_CTX_free(*provctx);
+        *provctx = NULL;
+        return 0;
+    }
+    PROV_CTX_set0_library_context(*provctx, (OPENSSL_CTX *)c_get_libctx(handle));
+    PROV_CTX_set0_handle(*provctx, handle);
+    PROV_CTX_set0_core_bio_method(*provctx, corebiometh);
+
+    *out = base_dispatch_table;
+
+    return 1;
+}