DESERIALIZER: Adjust to allow the use several deserializers with same name

A key type may be deserialized from one of several sources, which
means that more than one deserializer with the same name should be
possible to add to the stack of deserializers to try, in the
OSSL_DESERIALIZER_CTX collection.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12574)

diff --git a/crypto/serializer/deserializer_pkey.c b/crypto/serializer/deserializer_pkey.c
index 44e7eb56eea6c62dddf13571bf4f91aa84d31a5f..6375a29e36878c5a07cad75b7d2b6f261ae9b7df 100644 (file)
--- a/crypto/serializer/deserializer_pkey.c
+++ b/crypto/serializer/deserializer_pkey.c
@@ -241,6 +241,7 @@ DEFINE_STACK_OF_CSTRING()
 struct collected_data_st {
     struct deser_EVP_PKEY_data_st *process_data;
     STACK_OF(OPENSSL_CSTRING) *names;
+    OSSL_DESERIALIZER_CTX *ctx;
 
     unsigned int error_occured:1;
 };
@@ -279,6 +280,28 @@ static void collect_name(const char *name, void *arg)
     data->error_occured = 0;         /* All is good now */
 }
 
+static void collect_deserializer(OSSL_DESERIALIZER *deser, void *arg)
+{
+    struct collected_data_st *data = arg;
+    size_t i, end_i;
+
+    if (data->error_occured)
+        return;
+
+    data->error_occured = 1;         /* Assume the worst */
+
+    end_i = sk_OPENSSL_CSTRING_num(data->names);
+    for (i = 0; i < end_i; i++) {
+        const char *name = sk_OPENSSL_CSTRING_value(data->names, i);
+
+        if (!OSSL_DESERIALIZER_is_a(deser, name))
+            continue;
+        (void)OSSL_DESERIALIZER_CTX_add_deserializer(data->ctx, deser);
+    }
+
+    data->error_occured = 0;         /* All is good now */
+}
+
 OSSL_DESERIALIZER_CTX *
 OSSL_DESERIALIZER_CTX_new_by_EVP_PKEY(EVP_PKEY **pkey,
                                       const char *input_type,
@@ -300,6 +323,7 @@ OSSL_DESERIALIZER_CTX_new_by_EVP_PKEY(EVP_PKEY **pkey,
         goto err;
     }
     data->process_data->object = (void **)pkey;
+    data->ctx = ctx;
     OSSL_DESERIALIZER_CTX_set_input_type(ctx, input_type);
 
     /* First, find all keymgmts to form goals */
@@ -308,49 +332,30 @@ OSSL_DESERIALIZER_CTX_new_by_EVP_PKEY(EVP_PKEY **pkey,
     if (data->error_occured)
         goto err;
 
-    /*
-     * Then, use the names of those keymgmts to find the first set of
-     * derializers.
-     */
-    ERR_set_mark();
+    /* Then, we collect all the keymgmt names */
     end_i = sk_EVP_KEYMGMT_num(data->process_data->keymgmts);
     for (i = 0; i < end_i; i++) {
         EVP_KEYMGMT *keymgmt =
             sk_EVP_KEYMGMT_value(data->process_data->keymgmts, i);
-        size_t j;
-        OSSL_DESERIALIZER *deser = NULL;
 
         EVP_KEYMGMT_names_do_all(keymgmt, collect_name, data);
 
-        for (j = sk_OPENSSL_CSTRING_num(data->names);
-             j-- > 0 && deser == NULL;) {
-            const char *name = sk_OPENSSL_CSTRING_pop(data->names);
+        if (data->error_occured)
+            goto err;
+    }
 
-            ERR_set_mark();
-            deser = OSSL_DESERIALIZER_fetch(libctx, name, propquery);
-            ERR_pop_to_mark();
-        }
+    /*
+     * Finally, find all deserializers that have any keymgmt of the collected
+     * keymgmt names
+     */
+    OSSL_DESERIALIZER_do_all_provided(libctx, collect_deserializer, data);
 
-        /*
-         * The names in |data->names| aren't allocated for the stack,
-         * so we can simply clear it and let it be re-used.
-         */
-        sk_OPENSSL_CSTRING_zero(data->names);
+    if (data->error_occured)
+        goto err;
 
-        /*
-         * If we found a matching serializer, try to add it to the context.
-         */
-        if (deser != NULL) {
-            (void)OSSL_DESERIALIZER_CTX_add_deserializer(ctx, deser);
-            OSSL_DESERIALIZER_free(deser);
-        }
-    }
     /* If we found no deserializers to match the keymgmts, we err */
-    if (OSSL_DESERIALIZER_CTX_num_deserializers(ctx) == 0) {
-        ERR_clear_last_mark();
+    if (OSSL_DESERIALIZER_CTX_num_deserializers(ctx) == 0)
         goto err;
-    }
-    ERR_pop_to_mark();
 
     /* Finally, collect extra deserializers based on what we already have */
     (void)OSSL_DESERIALIZER_CTX_add_extra(ctx, libctx, propquery);