common: add OpenSSL Intel SHA ext hook

common/platform/config.c

@@ -23,6 +23,8 @@
 #include "platform/platform.h"
 #include "platform/vfs.h"
 #include "platform/system.h"
+#include "platform/openssl.h"
+
 
 void platform_config_load(struct platform_config *cfg, const wchar_t *filename)
 {
@@ -41,6 +43,7 @@ void platform_config_load(struct platform_config *cfg, const wchar_t *filename)
     nusec_config_load(&cfg->nusec, filename);
     vfs_config_load(&cfg->vfs, filename);
     system_config_load(&cfg->system, filename);
+    openssl_config_load(&cfg->openssl, filename);
 }
 
 void amvideo_config_load(struct amvideo_config *cfg, const wchar_t *filename)
@@ -362,3 +365,12 @@ void epay_config_load(struct epay_config *cfg, const wchar_t *filename)
     cfg->enable = GetPrivateProfileIntW(L"epay", L"enable", 1, filename);
     cfg->hook = GetPrivateProfileIntW(L"epay", L"hook", 1, filename);
 }
+
+void openssl_config_load(struct openssl_config *cfg, const wchar_t *filename)
+{
+    assert(cfg != NULL);
+    assert(filename != NULL);
+
+    cfg->enable = GetPrivateProfileIntW(L"openssl", L"enable", 1, filename);
+    cfg->override = GetPrivateProfileIntW(L"openssl", L"override", 0, filename);
+}

common/platform/config.h

@@ -19,6 +19,7 @@
 #include "platform/platform.h"
 #include "platform/vfs.h"
 #include "platform/system.h"
+#include "platform/openssl.h"
 
 void platform_config_load(
         struct platform_config *cfg,
@@ -36,3 +37,4 @@ void nusec_config_load(struct nusec_config *cfg, const wchar_t *filename);
 void pcbid_config_load(struct pcbid_config *cfg, const wchar_t *filename);
 void vfs_config_load(struct vfs_config *cfg, const wchar_t *filename);
 void system_config_load(struct system_config *cfg, const wchar_t *filename);
+void openssl_config_load(struct openssl_config *cfg, const wchar_t *filename);

common/platform/meson.build

@@ -38,5 +38,7 @@ platform_lib = static_library(
         'vfs.h',
         'system.c',
         'system.h',
+        'openssl.c',
+        'openssl.h'
     ],
 )

common/platform/openssl.c

@@ -0,0 +1,106 @@
+#include <windows.h>
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <intrin.h>
+
+#include "hook/table.h"
+
+#include "hooklib/config.h"
+
+#include "platform/openssl.h"
+
+#include "util/dprintf.h"
+
+/* API hooks */
+
+static char * __cdecl hook_getenv(const char *name);
+
+/* Link pointers */
+
+static char * (__cdecl *next_getenv)(const char *name);
+
+static bool openssl_hook_initted;
+static struct openssl_config openssl_config;
+
+static const struct hook_symbol openssl_hooks[] = {
+    {
+        .name  = "getenv",
+        .patch = hook_getenv,
+        .link  = (void **) &next_getenv
+    },
+};
+
+int check_intel_sha_extension() {
+    int cpui[4] = {0};
+
+    __cpuid(cpui, 0);
+    int nIds_ = cpui[0];
+
+    char vendor[0x20] = {0};
+    *((int*)vendor) = cpui[1];
+    *((int*)(vendor + 4)) = cpui[3];
+    *((int*)(vendor + 8)) = cpui[2];
+
+    // Intel CPU
+    int isIntel = (strcmp(vendor, "GenuineIntel") == 0);
+
+    if (isIntel && nIds_ >= 7) {
+        __cpuidex(cpui, 7, 0);
+        // SHA extension
+        return (cpui[1] & (1 << 29)) != 0; 
+    }
+
+    return 0;
+}
+
+HRESULT openssl_hook_init(const struct openssl_config *cfg)
+{
+    assert(cfg != NULL);
+
+    if (!cfg->enable) {
+        return S_FALSE;
+    }
+
+    if (openssl_hook_initted) {
+        return S_FALSE;
+    }
+
+    if (cfg->override) {
+        dprintf("OpenSSL: hook enabled.\n");
+    } else if (check_intel_sha_extension()) {
+        dprintf("OpenSSL: Intel CPU SHA extension detected, hook enabled.\n");
+    } else {
+        return S_FALSE;
+    }
+
+    openssl_hook_initted = true;
+
+    memcpy(&openssl_config, cfg, sizeof(*cfg));
+    hook_table_apply(
+        NULL,
+        "msvcr110.dll",
+        openssl_hooks,
+        _countof(openssl_hooks)
+    );
+
+    return S_OK;
+}
+
+static char * __cdecl hook_getenv(const char *name)
+{
+    /* Intercept OpenSSL CPU-cap override */
+    if (name && strcmp(name, "OPENSSL_ia32cap") == 0) {
+        static char override[] = "~0x20000000";
+
+        dprintf("OpenSSL: Overriding OPENSSL_ia32cap -> %s\n", override);
+        
+        return override;
+    }
+
+    char *real_val = next_getenv(name);
+
+    return real_val;
+}

common/platform/openssl.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stdbool.h>
+
+struct openssl_config {
+    bool enable;
+    bool override;
+};
+
+HRESULT openssl_hook_init(const struct openssl_config *cfg);

common/platform/platform.c

@@ -14,6 +14,7 @@
 #include "platform/platform.h"
 #include "platform/vfs.h"
 #include "platform/system.h"
+#include "platform/openssl.h"
 
 HRESULT platform_hook_init(
         const struct platform_config *cfg,
@@ -94,5 +95,11 @@ HRESULT platform_hook_init(
         return hr;
     }
 
+    hr = openssl_hook_init(&cfg->openssl);
+
+    if (FAILED(hr)) {
+        return hr;
+    }
+
     return S_OK;
 }

common/platform/platform.h

@@ -14,6 +14,7 @@
 #include "platform/pcbid.h"
 #include "platform/vfs.h"
 #include "platform/system.h"
+#include "platform/openssl.h"
 
 struct platform_config {
     struct amvideo_config amvideo;
@@ -28,6 +29,7 @@ struct platform_config {
     struct nusec_config nusec;
     struct vfs_config vfs;
     struct system_config system;
+    struct openssl_config openssl;
 };
 
 HRESULT platform_hook_init(

doc/config/common.md

@@ -663,4 +663,21 @@ Enables the Thinca emulation. This will allow you to enable E-Money on compatibl
 
 Default: `1`
 
-Enables hooking of respective Thinca DLL functions to emulate the existence of E-Money. This cannot be used with a real E-Money server.
+Enables hooking of respective Thinca DLL functions to emulate the existence of E-Money. This cannot be used with a real E-Money server.
+
+## `[openssl]`
+
+Configure the OpenSSL SHA extension bug hook.
+
+### `enable`
+
+Default: `1`
+
+Enables the OpenSSL hook to fix the SHA extension bug on Intel CPUs.
+
+### `override`
+
+Default: `0`
+
+Enables the override to always hook the OpenSSL env variable. By default the
+hook is only applied to Intel CPUs with the SHA extension present.