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Disabled Wow64 file system redirection:

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- When running pafish in a 64 bits sandbox many file checks failed;
- This will allow for pafish to access the native system32 directory.
This commit is contained in:
Duarte Silva 2015-05-18 15:17:16 +01:00
parent b0a2aeeda3
commit 2d2d410f31
2 changed files with 71 additions and 1 deletions
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66
pafish/utils.c
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@ -7,6 +7,53 @@
#include "utils.h"
#include "types.h"
/**
* Prototypes for the Wow64 API's since they aren't available in all Windows
* versions, most notetably Windows XP 32 bits.
*/
typedef int (WINAPI *DisableWow64FsRedirectionProto) (void*);
typedef int (WINAPI *RevertWow64FsRedirectionProto) (void*);
typedef int (WINAPI *IsWow64ProcessProto) (HANDLE, int*);
/**
* Wrapper function for Wow64DisableWow64FsRedirection. The function returns
* FALSE if the Wow64DisableWow64FsRedirection is not found or the invocation
* fails. The old value is returned in the argument old.
*/
int pafish_disable_wow64_fs_redirection(void * old) {
DisableWow64FsRedirectionProto fndisable = (DisableWow64FsRedirectionProto) GetProcAddress(
GetModuleHandleA("kernel32"), "Wow64DisableWow64FsRedirection");
return (fndisable != NULL) && (fndisable(old) != 0) ? TRUE : FALSE;
}
/**
* Wrapper function for Wow64RevertWow64FsRedirection. The function returns
* FALSE if the Wow64RevertWow64FsRedirection is not found or the invocation
* fails. The old value is to be provided using the argument old.
*/
int pafish_revert_wow64_fs_redirection(void * old) {
RevertWow64FsRedirectionProto fnrevert = (RevertWow64FsRedirectionProto) GetProcAddress(
GetModuleHandleA("kernel32"), "Wow64RevertWow64FsRedirection");
return (fnrevert != NULL) && (fnrevert(old) != 0) ? TRUE : FALSE;
}
/**
* Wrapper function for IsWow64Process. The function returns TRUE if the
* current process is running under Wow64, FALSE otherwise or if the
* invocation failed.
*/
int pafish_iswow64() {
int result = FALSE;
IsWow64ProcessProto fniswow = (IsWow64ProcessProto) GetProcAddress(
GetModuleHandleA("kernel32"), "IsWow64Process");
return (fniswow != NULL) && (fniswow(GetCurrentProcess(), &result) != 0) ? result : FALSE;
}
inline int pafish_exists_regkey(HKEY hKey, char * regkey_s) {
HKEY regkey;
LONG ret;
@ -55,6 +102,23 @@ inline int pafish_exists_regkey_value_str(HKEY hKey, char * regkey_s, char * val
}
inline int pafish_exists_file(char * filename) {
return (GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES) ? TRUE : FALSE;
DWORD res = INVALID_FILE_ATTRIBUTES;
if (pafish_iswow64() == TRUE) {
void *old = NULL;
// Disable redirection immediately prior to calling GetFileAttributes.
if (pafish_disable_wow64_fs_redirection(&old) ) {
res = GetFileAttributes(filename);
// Ignoring MSDN recommendation of exiting if this call fails.
pafish_revert_wow64_fs_redirection(old);
}
}
else {
res = GetFileAttributes(filename);
}
return (res != INVALID_FILE_ATTRIBUTES) ? TRUE : FALSE;
}

6
pafish/utils.h
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@ -2,6 +2,12 @@
#ifndef UTILS_H
#define UTILS_H
int pafish_disable_wow64_fs_redirection(void * old);
int pafish_revert_wow64_fs_redirection(void * old);
int pafish_iswow64();
inline int pafish_exists_regkey(HKEY hKey, char * regkey);
inline int pafish_exists_regkey_value_str(HKEY, char *, char *, char *);