require OpenSSL >= 1.0.2 and LibreSSL >= 3.1

Clean up old version guards in preparation for the upcoming OpenSSL 3.0
support.

OpenSSL 1.0.1 reached its EOL on 2016-12-31. At that time, we decided
to keep 1.0.1 support because many major Linux distributions were still
shipped with 1.0.1. Now, nearly 4 years later, most Linux distributions
are reaching their EOL and it should be safe to assume nobody uses them
anymore. Major ones that were using 1.0.1:

 - Ubuntu 14.04 is EOL since 2019-04-30
 - RHEL 6 will reach EOL on 2020-11-30

LibreSSL 3.0 and older versions are no longer supported by the LibreSSL
team as of October 2020.

Note that OpenSSL 1.0.2 also reached EOL on 2019-12-31 and 1.1.0 also
did on 2018-08-31.

Author: rhenium

.github/workflows/test.yml

@@ -71,11 +71,9 @@ jobs:
         os: [ ubuntu-latest ]
         ruby: [ "3.0" ]
         openssl:
-          - openssl-1.0.1u # EOL
           - openssl-1.0.2u # EOL
           - openssl-1.1.0l # EOL
           - openssl-1.1.1j
-          - libressl-2.9.2 # EOL
           - libressl-3.1.5
           - libressl-3.2.4
     steps:

ext/openssl/extconf.rb

@@ -33,9 +33,6 @@
   have_library("ws2_32")
 end
 
-Logging::message "=== Checking for required stuff... ===\n"
-result = pkg_config("openssl") && have_header("openssl/ssl.h")
-
 if $mingw
   append_cflags '-D_FORTIFY_SOURCE=2'
   append_ldflags '-fstack-protector'
@@ -92,19 +89,32 @@ def find_openssl_library
   return false
 end
 
-unless result
-  unless find_openssl_library
-    Logging::message "=== Checking for required stuff failed. ===\n"
-    Logging::message "Makefile wasn't created. Fix the errors above.\n"
-    raise "OpenSSL library could not be found. You might want to use " \
-      "--with-openssl-dir=<dir> option to specify the prefix where OpenSSL " \
-      "is installed."
-  end
+Logging::message "=== Checking for required stuff... ===\n"
+pkg_config_found = pkg_config("openssl") && have_header("openssl/ssl.h")
+
+if !pkg_config_found && !find_openssl_library
+  Logging::message "=== Checking for required stuff failed. ===\n"
+  Logging::message "Makefile wasn't created. Fix the errors above.\n"
+  raise "OpenSSL library could not be found. You might want to use " \
+    "--with-openssl-dir=<dir> option to specify the prefix where OpenSSL " \
+    "is installed."
+end
+
+version_ok = if have_macro("LIBRESSL_VERSION_NUMBER", "openssl/opensslv.h")
+  is_libressl = true
+  checking_for("LibreSSL version >= 3.1.0") {
+    try_static_assert("LIBRESSL_VERSION_NUMBER >= 0x30100000L", "openssl/opensslv.h") }
+else
+  checking_for("OpenSSL version >= 1.0.2") {
+    try_static_assert("OPENSSL_VERSION_NUMBER >= 0x10002000L", "openssl/opensslv.h") }
+end
+unless version_ok
+  raise "OpenSSL >= 1.0.2 or LibreSSL >= 3.1.0 is required"
 end
 
-unless checking_for("OpenSSL version is 1.0.1 or later") {
-    try_static_assert("OPENSSL_VERSION_NUMBER >= 0x10001000L", "openssl/opensslv.h") }
-  raise "OpenSSL >= 1.0.1 or LibreSSL is required"
+# Prevent wincrypt.h from being included, which defines conflicting macro with openssl/x509.h
+if is_libressl && ($mswin || $mingw)
+  $defs.push("-DNOCRYPT")
 end
 
 Logging::message "=== Checking for OpenSSL features... ===\n"
@@ -116,23 +126,8 @@ def find_openssl_library
   have_func("ENGINE_load_#{name}()", "openssl/engine.h")
 }
 
-if ($mswin || $mingw) && have_macro("LIBRESSL_VERSION_NUMBER", "openssl/opensslv.h")
-  $defs.push("-DNOCRYPT")
-end
-
-# added in 1.0.2
-have_func("EC_curve_nist2nid")
-have_func("X509_REVOKED_dup")
-have_func("X509_STORE_CTX_get0_store")
-have_func("SSL_CTX_set_alpn_select_cb")
-have_func("SSL_CTX_set1_curves_list(NULL, NULL)", "openssl/ssl.h")
-have_func("SSL_CTX_set_ecdh_auto(NULL, 0)", "openssl/ssl.h")
-have_func("SSL_get_server_tmp_key(NULL, NULL)", "openssl/ssl.h")
-have_func("SSL_is_server")
-
 # added in 1.1.0
-if !have_struct_member("SSL", "ctx", "openssl/ssl.h") ||
-    try_static_assert("LIBRESSL_VERSION_NUMBER >= 0x2070000fL", "openssl/opensslv.h")
+if !have_struct_member("SSL", "ctx", "openssl/ssl.h") || is_libressl
   $defs.push("-DHAVE_OPAQUE_OPENSSL")
 end
 have_func("CRYPTO_lock") || $defs.push("-DHAVE_OPENSSL_110_THREADING_API")

ext/openssl/openssl_missing.c

@@ -17,43 +17,6 @@
 
 #include "openssl_missing.h"
 
-/* added in 1.0.2 */
-#if !defined(OPENSSL_NO_EC)
-#if !defined(HAVE_EC_CURVE_NIST2NID)
-static struct {
-    const char *name;
-    int nid;
-} nist_curves[] = {
-    {"B-163", NID_sect163r2},
-    {"B-233", NID_sect233r1},
-    {"B-283", NID_sect283r1},
-    {"B-409", NID_sect409r1},
-    {"B-571", NID_sect571r1},
-    {"K-163", NID_sect163k1},
-    {"K-233", NID_sect233k1},
-    {"K-283", NID_sect283k1},
-    {"K-409", NID_sect409k1},
-    {"K-571", NID_sect571k1},
-    {"P-192", NID_X9_62_prime192v1},
-    {"P-224", NID_secp224r1},
-    {"P-256", NID_X9_62_prime256v1},
-    {"P-384", NID_secp384r1},
-    {"P-521", NID_secp521r1}
-};
-
-int
-ossl_EC_curve_nist2nid(const char *name)
-{
-    size_t i;
-    for (i = 0; i < (sizeof(nist_curves) / sizeof(nist_curves[0])); i++) {
-	if (!strcmp(nist_curves[i].name, name))
-	    return nist_curves[i].nid;
-    }
-    return NID_undef;
-}
-#endif
-#endif
-
 /*** added in 1.1.0 ***/
 #if !defined(HAVE_X509_CRL_GET0_SIGNATURE)
 void

ext/openssl/openssl_missing.h

@@ -12,27 +12,6 @@
 
 #include "ruby/config.h"
 
-/* added in 1.0.2 */
-#if !defined(OPENSSL_NO_EC)
-#if !defined(HAVE_EC_CURVE_NIST2NID)
-int ossl_EC_curve_nist2nid(const char *);
-#  define EC_curve_nist2nid ossl_EC_curve_nist2nid
-#endif
-#endif
-
-#if !defined(HAVE_X509_REVOKED_DUP)
-# define X509_REVOKED_dup(rev) (X509_REVOKED *)ASN1_dup((i2d_of_void *)i2d_X509_REVOKED, \
-	(d2i_of_void *)d2i_X509_REVOKED, (char *)(rev))
-#endif
-
-#if !defined(HAVE_X509_STORE_CTX_GET0_STORE)
-#  define X509_STORE_CTX_get0_store(x) ((x)->ctx)
-#endif
-
-#if !defined(HAVE_SSL_IS_SERVER)
-#  define SSL_is_server(s) ((s)->server)
-#endif
-
 /* added in 1.1.0 */
 #if !defined(HAVE_BN_GENCB_NEW)
 #  define BN_GENCB_new() ((BN_GENCB *)OPENSSL_malloc(sizeof(BN_GENCB)))
@@ -141,8 +120,7 @@ void ossl_X509_REQ_get0_signature(const X509_REQ *, const ASN1_BIT_STRING **, co
 	CRYPTO_add(&(x)->references, 1, CRYPTO_LOCK_EVP_PKEY);
 #endif
 
-#if !defined(HAVE_OPAQUE_OPENSSL) && \
-    (!defined(LIBRESSL_VERSION_NUMBER) || LIBRESSL_VERSION_NUMBER < 0x2070000fL)
+#if !defined(HAVE_OPAQUE_OPENSSL)
 #define IMPL_PKEY_GETTER(_type, _name) \
 static inline _type *EVP_PKEY_get0_##_type(EVP_PKEY *pkey) { \
 	return pkey->pkey._name; }

ext/openssl/ossl_ocsp.c

@@ -1069,55 +1069,7 @@ ossl_ocspbres_verify(int argc, VALUE *argv, VALUE self)
     x509st = GetX509StorePtr(store);
     flg = NIL_P(flags) ? 0 : NUM2INT(flags);
     x509s = ossl_x509_ary2sk(certs);
-#if (OPENSSL_VERSION_NUMBER < 0x1000202fL) || defined(LIBRESSL_VERSION_NUMBER)
-    /*
-     * OpenSSL had a bug that it doesn't use the certificates in x509s for
-     * verifying the chain. This can be a problem when the response is signed by
-     * a certificate issued by an intermediate CA.
-     *
-     *       root_ca
-     *         |
-     *   intermediate_ca
-     *         |-------------|
-     *     end_entity    ocsp_signer
-     *
-     * When the certificate hierarchy is like this, and the response contains
-     * only ocsp_signer certificate, the following code wrongly fails.
-     *
-     *   store = OpenSSL::X509::Store.new; store.add_cert(root_ca)
-     *   basic_response.verify([intermediate_ca], store)
-     *
-     * So add the certificates in x509s to the embedded certificates list first.
-     *
-     * This is fixed in OpenSSL 0.9.8zg, 1.0.0s, 1.0.1n, 1.0.2b. But it still
-     * exists in LibreSSL 2.1.10, 2.2.9, 2.3.6, 2.4.1.
-     */
-    if (!(flg & (OCSP_NOCHAIN | OCSP_NOVERIFY)) &&
-	sk_X509_num(x509s) && sk_X509_num(bs->certs)) {
-	int i;
-
-	bs = ASN1_item_dup(ASN1_ITEM_rptr(OCSP_BASICRESP), bs);
-	if (!bs) {
-	    sk_X509_pop_free(x509s, X509_free);
-	    ossl_raise(eOCSPError, "ASN1_item_dup");
-	}
-
-	for (i = 0; i < sk_X509_num(x509s); i++) {
-	    if (!OCSP_basic_add1_cert(bs, sk_X509_value(x509s, i))) {
-		sk_X509_pop_free(x509s, X509_free);
-		OCSP_BASICRESP_free(bs);
-		ossl_raise(eOCSPError, "OCSP_basic_add1_cert");
-	    }
-	}
-	result = OCSP_basic_verify(bs, x509s, x509st, flg);
-	OCSP_BASICRESP_free(bs);
-    }
-    else {
-	result = OCSP_basic_verify(bs, x509s, x509st, flg);
-    }
-#else
     result = OCSP_basic_verify(bs, x509s, x509st, flg);
-#endif
     sk_X509_pop_free(x509s, X509_free);
     if (result <= 0)
 	ossl_clear_error();