Revert API change of OPENSSL_version()

There was an API change done as part of PR #24450.
This patch reverts it.

Fixes #25690

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25692)

apps/version.c

@@ -56,7 +56,6 @@ int version_main(int argc, char **argv)
 #endif
     char *prog;
     OPTION_CHOICE o;
-    const char *tmp;
 
     prog = opt_init(argc, argv, version_options);
     while ((o = opt_next()) != OPT_EOF) {
@@ -134,18 +133,12 @@ opthelp:
     }
     if (cflags)
         printf("%s\n", OpenSSL_version(OPENSSL_CFLAGS));
-    if (dir) {
+    if (dir)
-        tmp = OpenSSL_version(OPENSSL_DIR);
+        printf("%s\n", OpenSSL_version(OPENSSL_DIR));
-        printf("OPENSSLDIR: %s\n", tmp == NULL ? "Undefined" : tmp);
+    if (engdir)
-    }
+        printf("%s\n", OpenSSL_version(OPENSSL_ENGINES_DIR));
-    if (engdir) {
+    if (moddir)
-        tmp = OpenSSL_version(OPENSSL_ENGINES_DIR);
+        printf("%s\n", OpenSSL_version(OPENSSL_MODULES_DIR));
-        printf("ENGINESDIR: %s\n", tmp == NULL ? "Undefined" : tmp);
-    }
-    if (moddir) {
-        tmp = OpenSSL_version(OPENSSL_MODULES_DIR);
-        printf("MODULESDIR: %s\n", tmp == NULL ? "Undefined" : tmp);
-    }
     if (seed) {
         const char *src = OPENSSL_info(OPENSSL_INFO_SEED_SOURCE);
         printf("Seeding source: %s\n", src ? src : "N/A");
@@ -154,7 +147,7 @@ opthelp:
         printf("%s\n", OpenSSL_version(OPENSSL_CPU_INFO));
 #if defined(_WIN32)
     if (windows)
-        printf("OSSL_WINCTX: %s\n", OpenSSL_version(OPENSSL_WINCTX));
+        printf("%s\n", OpenSSL_version(OPENSSL_WINCTX));
 #endif
     ret = 0;
  end:

crypto/cversion.c

@@ -7,8 +7,12 @@
  * https://www.openssl.org/source/license.html
  */
 
+#include <stdio.h>
+#include <openssl/bio.h>
+#include "internal/e_os.h"
 #include "internal/cryptlib.h"
 #include "internal/common.h"
+#include "internal/thread_once.h"
 
 #include "buildinf.h"
 
@@ -44,8 +48,41 @@ const char *OPENSSL_version_build_metadata(void)
 
 extern char ossl_cpu_info_str[];
 
+#if defined(_WIN32) && defined(OSSL_WINCTX)
+/* size: MAX_PATH + sizeof("OPENSSLDIR: \"\"") */
+static char openssldir[MAX_PATH + 15];
+
+/* size: MAX_PATH + sizeof("ENGINESDIR: \"\"") */
+static char enginesdir[MAX_PATH + 15];
+
+/* size: MAX_PATH + sizeof("MODULESDIR: \"\"") */
+static char modulesdir[MAX_PATH + 15];
+
+static CRYPTO_ONCE version_strings_once = CRYPTO_ONCE_STATIC_INIT;
+
+DEFINE_RUN_ONCE_STATIC(version_strings_setup)
+{
+    BIO_snprintf(openssldir, sizeof(openssldir), "OPENSSLDIR: \"%s\"",
+                 ossl_get_openssldir());
+    BIO_snprintf(enginesdir, sizeof(enginesdir), "ENGINESDIR: \"%s\"",
+                 ossl_get_enginesdir());
+    BIO_snprintf(modulesdir, sizeof(modulesdir), "MODULESDIR: \"%s\"",
+                 ossl_get_modulesdir());
+    return 1;
+}
+
+# define TOSTR(x) #x
+# define OSSL_WINCTX_STRING "OSSL_WINCTX: \"" ## TOSTR(OSSL_WINCTX) ## "\""
+
+#endif
+
 const char *OpenSSL_version(int t)
 {
+#if defined(_WIN32) && defined(OSSL_WINCTX)
+    /* Cannot really fail but we would return empty strings anyway */
+    (void)RUN_ONCE(&version_strings_once, version_strings_setup);
+#endif
+
     switch (t) {
     case OPENSSL_VERSION:
         return OPENSSL_VERSION_TEXT;
@@ -59,19 +96,44 @@ const char *OpenSSL_version(int t)
         return compiler_flags;
     case OPENSSL_PLATFORM:
         return PLATFORM;
+#if defined(_WIN32) && defined(OSSL_WINCTX)
     case OPENSSL_DIR:
-        return ossl_get_openssldir();
+        return openssldir;
     case OPENSSL_ENGINES_DIR:
-        return ossl_get_enginesdir();
+        return enginesdir;
     case OPENSSL_MODULES_DIR:
-        return ossl_get_modulesdir();
+        return modulesdir;
+#else
+    case OPENSSL_DIR:
+# ifdef OPENSSLDIR
+        return "OPENSSLDIR: \"" OPENSSLDIR "\"";
+# else
+        return "OPENSSLDIR: N/A";
+# endif
+    case OPENSSL_ENGINES_DIR:
+# ifdef ENGINESDIR
+        return "ENGINESDIR: \"" ENGINESDIR "\"";
+# else
+        return "ENGINESDIR: N/A";
+# endif
+    case OPENSSL_MODULES_DIR:
+# ifdef MODULESDIR
+        return "MODULESDIR: \"" MODULESDIR "\"";
+# else
+        return "MODULESDIR: N/A";
+# endif
+#endif
     case OPENSSL_CPU_INFO:
         if (OPENSSL_info(OPENSSL_INFO_CPU_SETTINGS) != NULL)
             return ossl_cpu_info_str;
         else
             return "CPUINFO: N/A";
     case OPENSSL_WINCTX:
-        return ossl_get_wininstallcontext();
+#if defined(_WIN32) && defined(OSSL_WINCTX)
+        return OSSL_WINCTX_STRING;
+#else
+        return "OSSL_WINCTX: Undefined";
+#endif
     }
     return "not available";
 }