openssl: remove most BoringSSL #ifdefs.

As of https://boringssl-review.googlesource.com/#/c/6980/, almost all of
BoringSSL #ifdefs in cURL should be unnecessary:

- BoringSSL provides no-op stubs for compatibility which replaces most
  #ifdefs.

- DES_set_odd_parity has been in BoringSSL for nearly a year now. Remove
  the compatibility codepath.

- With a small tweak to an extend_key_56_to_64 call, the NTLM code
  builds fine.

- Switch OCSP-related #ifdefs to the more generally useful
  OPENSSL_NO_OCSP.

The only #ifdefs which remain are Curl_ossl_version and the #undefs to
work around OpenSSL and wincrypt.h name conflicts. (BoringSSL leaves
that to the consumer. The in-header workaround makes things sensitive to
include order.)

This change errs on the side of removing conditionals despite many of
the restored codepaths being no-ops. (BoringSSL generally adds no-op
compatibility stubs when possible. OPENSSL_VERSION_NUMBER #ifdefs are
bad enough!)

Closes #640

8 files changed, 19 insertions, 72 deletions

diff --git a/configure.ac b/configure.ac
index 3b4139328..7af4a80a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1631,8 +1631,6 @@ if test "$curl_ssl_msg" = "$init_ssl_msg" && test X"$OPT_SSL" != Xno; then
     dnl Older versions of Cyassl (some time before 2.9.4) don't have
     dnl SSL_get_shutdown (but this check won't actually detect it there
     dnl as it's a macro that needs the header files be included)
-    dnl BoringSSL didn't have DES_set_odd_parity for a while but now it is
-    dnl back again.
 
     AC_CHECK_FUNCS( RAND_status \
                     RAND_screen \
@@ -1640,8 +1638,7 @@ if test "$curl_ssl_msg" = "$init_ssl_msg" && test X"$OPT_SSL" != Xno; then
                     ENGINE_cleanup \
                     CRYPTO_cleanup_all_ex_data \
                     SSL_get_shutdown \
-                    SSLv2_client_method \
-                    DES_set_odd_parity )
+                    SSLv2_client_method )
 
     AC_MSG_CHECKING([for BoringSSL])
     AC_COMPILE_IFELSE([
diff --git a/docs/THANKS b/docs/THANKS
index c8350897e..12e442fbd 100644
--- a/docs/THANKS
+++ b/docs/THANKS
@@ -457,6 +457,7 @@ Glen A Johnson Jr.
 Glen Nakamura
 Glen Scott
 Glenn Sheridan
+Google Inc.
 Gordon Marler
 Gorilla Maguila
 Grant Erickson
diff --git a/lib/config-win32.h b/lib/config-win32.h
index 3920e1fc9..269e6dbbf 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -228,12 +228,6 @@
    This is present in OpenSSL versions after 0.9.6b */
 #define HAVE_CRYPTO_CLEANUP_ALL_EX_DATA 1
 
-/* Define if you have the 'DES_set_odd_parity' function when using OpenSSL/
-   BoringSSL */
-#if defined(USE_OPENSSL) || defined(HAVE_BORINGSSL)
-#define HAVE_DES_SET_ODD_PARITY 1
-#endif
-
 /* Define if you have the select function. */
 #define HAVE_SELECT 1
 
diff --git a/lib/curl_des.c b/lib/curl_des.c
index 3c7e529a7..421c9f768 100644
--- a/lib/curl_des.c
+++ b/lib/curl_des.c
@@ -22,7 +22,7 @@
 
 #include "curl_setup.h"
 
-#if defined(USE_NTLM) && !defined(HAVE_DES_SET_ODD_PARITY)
+#if defined(USE_NTLM) && !defined(USE_OPENSSL)
 
 #include "curl_des.h"
 
@@ -60,4 +60,4 @@ void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
   }
 }
 
-#endif /* USE_NTLM && !HAVE_DES_SET_ODD_PARITY */
+#endif /* USE_NTLM && !USE_OPENSSL */
diff --git a/lib/curl_des.h b/lib/curl_des.h
index 632c38432..129060ff7 100644
--- a/lib/curl_des.h
+++ b/lib/curl_des.h
@@ -24,11 +24,11 @@
 
 #include "curl_setup.h"
 
-#if defined(USE_NTLM) && !defined(HAVE_DES_SET_ODD_PARITY)
+#if defined(USE_NTLM) && !defined(USE_OPENSSL)
 
 /* Applies odd parity to the given byte array */
 void Curl_des_set_odd_parity(unsigned char *bytes, size_t length);
 
-#endif /* USE_NTLM && !HAVE_DES_SET_ODD_PARITY */
+#endif /* USE_NTLM && !USE_OPENSSL */
 
 #endif /* HEADER_CURL_DES_H */
diff --git a/lib/curl_ntlm_core.c b/lib/curl_ntlm_core.c
index fe976c97c..e79d1f64f 100644
--- a/lib/curl_ntlm_core.c
+++ b/lib/curl_ntlm_core.c
@@ -143,14 +143,10 @@ static void setup_des_key(const unsigned char *key_56,
   DES_cblock key;
 
   /* Expand the 56-bit key to 64-bits */
-  extend_key_56_to_64(key_56, (char *) key);
+  extend_key_56_to_64(key_56, (char *) &key);
 
   /* Set the key parity to odd */
-#ifndef HAVE_DES_SET_ODD_PARITY /* older boringssl */
-  Curl_des_set_odd_parity((unsigned char *) &key, sizeof(key));
-#else
   DES_set_odd_parity(&key);
-#endif
 
   /* Set the key */
   DES_set_key(&key, ks);
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 33ad12919..516327345 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -628,13 +628,9 @@ int netware_init(void);
     defined(USE_GNUTLS) || defined(USE_NSS) || defined(USE_DARWINSSL) || \
     defined(USE_OS400CRYPTO) || defined(USE_WIN32_CRYPTO)
 
-#ifdef HAVE_BORINGSSL /* BoringSSL is not NTLM capable */
-#undef USE_NTLM
-#else
 #define USE_NTLM
 #endif
 #endif
-#endif
 
 /* non-configure builds may define CURL_WANTS_CA_BUNDLE_ENV */
 #if defined(CURL_WANTS_CA_BUNDLE_ENV) && !defined(CURL_CA_BUNDLE)
diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index b36c6a611..b4f62e606 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -68,7 +68,7 @@
 #include <openssl/pkcs12.h>
 #endif
 
-#if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_IS_BORINGSSL)
+#if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_NO_OCSP)
 #include <openssl/ocsp.h>
 #endif
 
@@ -83,21 +83,8 @@
 #error "OPENSSL_VERSION_NUMBER not defined"
 #endif
 
-#if !defined(OPENSSL_IS_BORINGSSL)
-/* ENGINE_load_private_key() takes four arguments */
-#define HAVE_ENGINE_LOAD_FOUR_ARGS
+#if defined(HAVE_OPENSSL_ENGINE_H)
 #include <openssl/ui.h>
-#else
-/* ENGINE_load_private_key() takes three arguments */
-#undef HAVE_ENGINE_LOAD_FOUR_ARGS
-#endif
-
-#if defined(HAVE_OPENSSL_PKCS12_H) && !defined(OPENSSL_IS_BORINGSSL)
-/* OpenSSL has PKCS 12 support, BoringSSL does not */
-#define HAVE_PKCS12_SUPPORT
-#else
-/* OpenSSL does not have PKCS12 support */
-#undef HAVE_PKCS12_SUPPORT
 #endif
 
 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
@@ -106,10 +93,7 @@
 #define SSL_METHOD_QUAL
 #endif
 
-#ifdef OPENSSL_IS_BORINGSSL
-/* BoringSSL has no ERR_remove_state() */
-#define ERR_remove_state(x)
-#elif (OPENSSL_VERSION_NUMBER >= 0x10000000L)
+#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 #define HAVE_ERR_REMOVE_THREAD_STATE 1
 #endif
 
@@ -131,17 +115,8 @@
 #define HAVE_X509_GET0_SIGNATURE 1
 #endif
 
-#if defined(OPENSSL_IS_BORINGSSL)
-#define NO_RAND_SEED 1
-/* In BoringSSL OpenSSL_add_all_algorithms does nothing */
-#define OpenSSL_add_all_algorithms()
-/* BoringSSL does not have CONF_modules_load_file, CONF_modules_free */
-#define CONF_modules_load_file(a,b,c)
-#define CONF_modules_free()
-#endif
-
-#if (OPENSSL_VERSION_NUMBER < 0x0090808fL) || defined(OPENSSL_IS_BORINGSSL)
-/* not present in BoringSSL  or older OpenSSL */
+#if (OPENSSL_VERSION_NUMBER < 0x0090808fL)
+/* not present in older OpenSSL */
 #define OPENSSL_load_builtin_modules(x)
 #endif
 
@@ -175,7 +150,6 @@ static int passwd_callback(char *buf, int num, int encrypting,
  * pass in an argument that is never used.
  */
 
-#ifndef NO_RAND_SEED
 #ifdef HAVE_RAND_STATUS
 #define seed_enough(x) rand_enough()
 static bool rand_enough(void)
@@ -272,11 +246,6 @@ static void Curl_ossl_seed(struct SessionHandle *data)
     ssl_seeded = TRUE;
   }
 }
-#else
-/* BoringSSL needs no seeding */
-#define Curl_ossl_seed(x)
-#endif
-
 
 #ifndef SSL_FILETYPE_ENGINE
 #define SSL_FILETYPE_ENGINE 42
@@ -299,7 +268,7 @@ static int do_file_type(const char *type)
   return -1;
 }
 
-#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_LOAD_FOUR_ARGS)
+#if defined(HAVE_OPENSSL_ENGINE_H)
 /*
  * Supply default password to the engine user interface conversation.
  * The password is passed by OpenSSL engine from ENGINE_load_private_key()
@@ -449,7 +418,7 @@ int cert_stuff(struct connectdata *conn,
 
     case SSL_FILETYPE_PKCS12:
     {
-#ifdef HAVE_PKCS12_SUPPORT
+#ifdef HAVE_OPENSSL_PKCS12_H
       FILE *f;
       PKCS12 *p12;
       EVP_PKEY *pri;
@@ -565,7 +534,6 @@ int cert_stuff(struct connectdata *conn,
       {                         /* XXXX still needs some work */
         EVP_PKEY *priv_key = NULL;
         if(data->state.engine) {
-#ifdef HAVE_ENGINE_LOAD_FOUR_ARGS
           UI_METHOD *ui_method =
             UI_create_method((char *)"cURL user interface");
           if(!ui_method) {
@@ -576,17 +544,12 @@ int cert_stuff(struct connectdata *conn,
           UI_method_set_closer(ui_method, UI_method_get_closer(UI_OpenSSL()));
           UI_method_set_reader(ui_method, ssl_ui_reader);
           UI_method_set_writer(ui_method, ssl_ui_writer);
-#endif
           /* the typecast below was added to please mingw32 */
           priv_key = (EVP_PKEY *)
             ENGINE_load_private_key(data->state.engine, key_file,
-#ifdef HAVE_ENGINE_LOAD_FOUR_ARGS
                                     ui_method,
-#endif
                                     data->set.str[STRING_KEY_PASSWD]);
-#ifdef HAVE_ENGINE_LOAD_FOUR_ARGS
           UI_destroy_method(ui_method);
-#endif
           if(!priv_key) {
             failf(data, "failed to load private key from crypto engine");
             return 0;
@@ -1228,7 +1191,7 @@ static CURLcode verifyhost(struct connectdata *conn, X509 *server_cert)
 }
 
 #if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_NO_TLSEXT) && \
-    !defined(OPENSSL_IS_BORINGSSL)
+    !defined(OPENSSL_NO_OCSP)
 static CURLcode verifystatus(struct connectdata *conn,
                              struct ssl_connect_data *connssl)
 {
@@ -1670,7 +1633,7 @@ static CURLcode ossl_connect_step1(struct connectdata *conn, int sockindex)
   case CURL_SSLVERSION_TLSv1_2:
     /* it will be handled later with the context options */
 #if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && \
-    !defined(LIBRESSL_VERSION_NUMBER) && !defined(OPENSSL_IS_BORINGSSL)
+    !defined(LIBRESSL_VERSION_NUMBER)
     req_method = TLS_client_method();
 #else
     req_method = SSLv23_client_method();
@@ -2033,7 +1996,7 @@ static CURLcode ossl_connect_step1(struct connectdata *conn, int sockindex)
   }
 
 #if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_NO_TLSEXT) && \
-    !defined(OPENSSL_IS_BORINGSSL)
+    !defined(OPENSSL_NO_OCSP)
   if(data->set.ssl.verifystatus)
     SSL_set_tlsext_status_type(connssl->handle, TLSEXT_STATUSTYPE_ocsp);
 #endif
@@ -2639,7 +2602,7 @@ static CURLcode servercert(struct connectdata *conn,
   }
 
 #if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_NO_TLSEXT) && \
-    !defined(OPENSSL_IS_BORINGSSL)
+    !defined(OPENSSL_NO_OCSP)
   if(data->set.ssl.verifystatus) {
     result = verifystatus(conn, connssl);
     if(result) {
@@ -3055,7 +3018,7 @@ void Curl_ossl_sha256sum(const unsigned char *tmp, /* input */
 bool Curl_ossl_cert_status_request(void)
 {
 #if (OPENSSL_VERSION_NUMBER >= 0x0090808fL) && !defined(OPENSSL_NO_TLSEXT) && \
-    !defined(OPENSSL_IS_BORINGSSL)
+    !defined(OPENSSL_NO_OCSP)
   return TRUE;
 #else
   return FALSE;