Make the fuzzers more reproducible

[openssl.git] / fuzz / server.c

diff --git a/fuzz/server.c b/fuzz/server.c
index b8a3ac44e382a11b2d5fe88b1b1caaaa1087f5af..3b5df9dc4215c95aef4fa03df6b6e36522723f21 100644 (file)
--- a/fuzz/server.c
+++ b/fuzz/server.c
@@ -16,6 +16,7 @@
 #include <openssl/rand.h>
 #include <openssl/ssl.h>
 #include <openssl/rsa.h>
+#include <openssl/err.h>
 #include "fuzzer.h"
 
 static const uint8_t kCertificateDER[] = {
@@ -189,16 +190,57 @@ static const uint8_t kRSAPrivateKeyDER[] = {
     0x98, 0x46, 0x89, 0x82, 0x40,
 };
 
-static SSL_CTX *ctx;
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+extern int rand_predictable;
+#endif
+#define ENTROPY_NEEDED 32
+
+/* unused, to avoid warning. */
+static int idx;
 
 int FuzzerInitialize(int *argc, char ***argv)
 {
-    const uint8_t *bufp = kRSAPrivateKeyDER;
+    STACK_OF(SSL_COMP) *comp_methods;
+
+    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
+    OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
+    ERR_get_state();
+    CRYPTO_free_ex_index(0, -1);
+    idx = SSL_get_ex_data_X509_STORE_CTX_idx();
+    RAND_add("", 1, ENTROPY_NEEDED);
+    RAND_status();
+    RSA_get_default_method();
+    comp_methods = SSL_COMP_get_compression_methods();
+    OPENSSL_sk_sort((OPENSSL_STACK *)comp_methods);
+
+
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    rand_predictable = 1;
+#endif
+
+    return 1;
+}
+
+int FuzzerTestOneInput(const uint8_t *buf, size_t len)
+{
+    SSL *server;
+    BIO *in;
+    BIO *out;
+    SSL_CTX *ctx;
+    int ret;
     RSA *privkey;
+    const uint8_t *bufp = kRSAPrivateKeyDER;
     EVP_PKEY *pkey;
-    int ret;
     X509 *cert;
 
+    if (len == 0)
+        return 0;
+
+    /*
+     * TODO: use the ossltest engine (optionally?) to disable crypto checks.
+     */
+
+    /* This only fuzzes the initial flow from the client so far. */
     ctx = SSL_CTX_new(SSLv23_method());
     privkey = d2i_RSAPrivateKey(NULL, &bufp, sizeof(kRSAPrivateKeyDER));
     OPENSSL_assert(privkey != NULL);
@@ -207,6 +249,7 @@ int FuzzerInitialize(int *argc, char ***argv)
     ret = SSL_CTX_use_PrivateKey(ctx, pkey);
     OPENSSL_assert(ret == 1);
     EVP_PKEY_free(pkey);
+
     bufp = kCertificateDER;
     cert = d2i_X509(NULL, &bufp, sizeof(kCertificateDER));
     OPENSSL_assert(cert != NULL);
@@ -214,24 +257,6 @@ int FuzzerInitialize(int *argc, char ***argv)
     OPENSSL_assert(ret == 1);
     X509_free(cert);
 
-    return 1;
-}
-
-int FuzzerTestOneInput(const uint8_t *buf, size_t len)
-{
-    SSL *server;
-    BIO *in;
-    BIO *out;
-    if (!len) {
-        return 0;
-    }
-    /* TODO: make this work for OpenSSL. There's a PREDICT define that may do
-     * the job.
-     * TODO: use the ossltest engine (optionally?) to disable crypto checks.
-     * RAND_reset_for_fuzzing();
-     */
-
-    /* This only fuzzes the initial flow from the client so far. */
     server = SSL_new(ctx);
     in = BIO_new(BIO_s_mem());
     out = BIO_new(BIO_s_mem());
@@ -248,10 +273,12 @@ int FuzzerTestOneInput(const uint8_t *buf, size_t len)
         }
     }
     SSL_free(server);
+    ERR_clear_error();
+    SSL_CTX_free(ctx);
+
     return 0;
 }
 
 void FuzzerCleanup(void)
 {
-    SSL_CTX_free(ctx);
 }