diff options
| -rw-r--r-- | README.Windows | 15 | ||||
| -rw-r--r-- | lib/i386-io-windows.h | 1200 |
2 files changed, 1185 insertions, 30 deletions
diff --git a/README.Windows b/README.Windows index e73762b..e0a668c 100644 --- a/README.Windows +++ b/README.Windows @@ -4,13 +4,14 @@ to Alexander Stock for contributing the port. Updated after version 2.2.6 to compile again, and with MinGW, even (only?) cross-compiling. (Hopefully it works with MSVC too.) -To use this port, you need to install WinIO.dll first. You can get it here: - - https://github.com/starofrainnight/winio - https://github.com/vaptu/winio - -However, you need to use win32/config.{h,mk} instead of the automatically -generated lib/config.{h,mk} as lib/configure does not run on Windows. +To use this port on NT-based systems, it is required to have SeTcbPrivilege +(Act as part of the operating system privilege), which can be enabled in User +Accounts settings (take effect after next login). By default this privilege is +not enabled for any non-system user. Or alternatively it is required to be in +local Administrators group and on Windows 2000 SP4 or higher systems to have +SeImpersonatePrivilege (Impersonate a client after authentication privilege) +which is by default enabled for all local Administrators accounts. There is no +special requirement for DOS-based systems. ================================================================================ BEWARE: The current implementation pokes I/O ports to access the PCI devices diff --git a/lib/i386-io-windows.h b/lib/i386-io-windows.h index e065620..ca8b3bb 100644 --- a/lib/i386-io-windows.h +++ b/lib/i386-io-windows.h @@ -3,12 +3,14 @@ * * Copyright (c) 2004 Alexander Stock <stock.alexander@gmx.de> * Copyright (c) 2006 Martin Mares <mj@ucw.cz> + * Copyright (c) 2021 Pali Rohár <pali@kernel.org> * * Can be freely distributed and used under the terms of the GNU GPL. */ #include <io.h> #include <windows.h> +#include <aclapi.h> #ifdef _MSC_VER /* MSVC compiler provides I/O port intrinsics for both 32 and 64-bit modes. */ @@ -97,13 +99,1175 @@ unsigned long _inpd(unsigned short port); #define inw(x) _inpw(x) #define inl(x) _inpd(x) +/* + * Define __readeflags() for MSVC and GCC compilers. + * MSVC since version 14.00 included in WDK 6001 and since version 15.00 + * included in VS 2008 provides __readeflags() intrinsic for both 32 and 64-bit + * modes. WDK 6001 defines macro __BUILDMACHINE__ to value WinDDK. VS 2008 does + * not define this macro at all. MSVC throws error if name of user defined + * function conflicts with some MSVC intrinsic. + * MSVC supports inline assembly via __asm keyword in 32-bit mode only. + * GCC version 4.9.0 and higher provides __builtin_ia32_readeflags_uXX() + * builtin for XX-mode. + */ +#if defined(_MSC_VER) && (_MSC_VER >= 1500 || (_MSC_VER >= 1400 && defined(__BUILDMACHINE__))) +#pragma intrinsic(__readeflags) +#elif defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 9) || (__GNUC__ > 4)) +#ifdef __x86_64__ +#define __readeflags() __builtin_ia32_readeflags_u64() +#else +#define __readeflags() __builtin_ia32_readeflags_u32() +#endif +#elif defined(_MSC_VER) && defined(_M_IX86) +static inline unsigned int +__readeflags(void) +{ + __asm pushfd; + __asm pop eax; +} +#elif defined(__GNUC__) +static inline unsigned +#ifdef __x86_64__ +long long +#endif +int +__readeflags(void) +{ + unsigned +#ifdef __x86_64__ + long long +#endif + int eflags; + asm volatile ("pushf\n\tpop %0\n" : "=r" (eflags)); + return eflags; +} +#else +#error "Unsupported compiler" +#endif + +/* Read IOPL of the current process, IOPL is stored in eflag bits [13:12]. */ +#define read_iopl() ((__readeflags() >> 12) & 0x3) + +/* Unfortunately i586-mingw32msvc toolchain does not provide this constant. */ +#ifndef PROCESS_QUERY_LIMITED_INFORMATION +#define PROCESS_QUERY_LIMITED_INFORMATION 0x1000 +#endif + +/* Unfortunately some toolchains do not provide this constant. */ +#ifndef SE_IMPERSONATE_NAME +#define SE_IMPERSONATE_NAME TEXT("SeImpersonatePrivilege") +#endif + +/* + * These psapi functions are available in kernel32.dll library with K32 prefix + * on Windows 7 and higher systems. On older Windows systems these functions are + * available in psapi.dll libary without K32 prefix. So resolve pointers to + * these functions dynamically at runtime from the available system library. + * Function GetProcessImageFileNameW() is not available on Windows 2000 and + * older systems. + */ +typedef BOOL (WINAPI *EnumProcessesProt)(DWORD *lpidProcess, DWORD cb, DWORD *cbNeeded); +typedef DWORD (WINAPI *GetProcessImageFileNameWProt)(HANDLE hProcess, LPWSTR lpImageFileName, DWORD nSize); +typedef DWORD (WINAPI *GetModuleFileNameExWProt)(HANDLE hProcess, HMODULE hModule, LPWSTR lpImageFileName, DWORD nSize); + +/* + * These aclapi functions are available in advapi.dll library on Windows NT 4.0 + * and higher systems. + */ +typedef DWORD (WINAPI *GetSecurityInfoProt)(HANDLE handle, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, PSID *ppsidOwner, PSID *ppsidGroup, PACL *ppDacl, PACL *ppSacl, PSECURITY_DESCRIPTOR *ppSecurityDescriptor); +typedef DWORD (WINAPI *SetSecurityInfoProt)(HANDLE handle, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, PSID psidOwner, PSID psidGroup, PACL pDacl, PACL pSacl); +typedef DWORD (WINAPI *SetEntriesInAclProt)(ULONG cCountOfExplicitEntries, PEXPLICIT_ACCESS pListOfExplicitEntries, PACL OldAcl, PACL *NewAcl); + +/* + * This errhandlingapi function is available in kernel32.dll library on + * Windows 7 and higher systems. + */ +typedef BOOL (WINAPI *SetThreadErrorModeProt)(DWORD dwNewMode, LPDWORD lpOldMode); + +/* + * Unfortunately NtSetInformationProcess() function, ProcessUserModeIOPL + * constant and all other helpers for its usage are not specified in any + * standard WinAPI header file. So define all of required constants and types. + * Function NtSetInformationProcess() is available in ntdll.dll library on all + * Windows systems but marked as it can be removed in some future version. + */ +#ifndef NTSTATUS +#define NTSTATUS LONG +#endif +#ifndef STATUS_NOT_IMPLEMENTED +#define STATUS_NOT_IMPLEMENTED (NTSTATUS)0xC0000002 +#endif +#ifndef STATUS_PRIVILEGE_NOT_HELD +#define STATUS_PRIVILEGE_NOT_HELD (NTSTATUS)0xC0000061 +#endif +#ifndef PROCESSINFOCLASS +#define PROCESSINFOCLASS DWORD +#endif +#ifndef ProcessUserModeIOPL +#define ProcessUserModeIOPL 16 +#endif +typedef NTSTATUS (NTAPI *NtSetInformationProcessProt)(HANDLE ProcessHandle, PROCESSINFOCLASS ProcessInformationClass, PVOID ProcessInformation, ULONG ProcessInformationLength); + +/* + * Check if the current thread has particular privilege in current active access + * token. Case when it not possible to determinate it (e.g. current thread does + * not have permission to open its own current active access token) is evaluated + * as thread does not have that privilege. + */ +static BOOL +have_privilege(LUID luid_privilege) +{ + PRIVILEGE_SET priv; + HANDLE token; + BOOL ret; + + /* + * If the current thread does not have active access token then thread + * uses primary process access token for all permission checks. + */ + if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) && + (GetLastError() != ERROR_NO_TOKEN || + !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token))) + return FALSE; + + priv.PrivilegeCount = 1; + priv.Control = PRIVILEGE_SET_ALL_NECESSARY; + priv.Privilege[0].Luid = luid_privilege; + priv.Privilege[0].Attributes = SE_PRIVILEGE_ENABLED; + + if (!PrivilegeCheck(token, &priv, &ret)) + return FALSE; + + return ret; +} + +/* + * Enable or disable particular privilege in specified access token. + * + * Note that it is not possible to disable privilege in access token with + * SE_PRIVILEGE_ENABLED_BY_DEFAULT attribute. This function does not check + * this case and incorrectly returns no error even when disabling failed. + * Rationale for this decision: Simplification of this function as WinAPI + * call AdjustTokenPrivileges() does not signal error in this case too. + */ +static BOOL +set_privilege(HANDLE token, LUID luid_privilege, BOOL enable) +{ + TOKEN_PRIVILEGES token_privileges; + + token_privileges.PrivilegeCount = 1; + token_privileges.Privileges[0].Luid = luid_privilege; + token_privileges.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0; + + /* + * WinAPI function AdjustTokenPrivileges() success also when not all + * privileges were enabled. It is always required to check for failure + * via GetLastError() call. AdjustTokenPrivileges() always sets error + * also when it success, as opposite to other WinAPI functions. + */ + if (!AdjustTokenPrivileges(token, FALSE, &token_privileges, sizeof(token_privileges), NULL, NULL) || + GetLastError() != ERROR_SUCCESS) + return FALSE; + + return TRUE; +} + +/* + * Change access token for the current thread to new specified access token. + * Previously active access token is stored in old_token variable and can be + * used for reverting to this access token. It is set to NULL if the current + * thread previously used primary process access token. + */ +static BOOL +change_token(HANDLE new_token, HANDLE *old_token) +{ + HANDLE token; + + if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token)) + { + if (GetLastError() != ERROR_NO_TOKEN) + return FALSE; + token = NULL; + } + + if (!ImpersonateLoggedOnUser(new_token)) + { + if (token) + CloseHandle(token); + return FALSE; + } + + *old_token = token; + return TRUE; +} + +/* + * Change access token for the current thread to the primary process access + * token. This function fails also when the current thread already uses primary + * process access token. + */ +static BOOL +change_token_to_primary(HANDLE *old_token) +{ + HANDLE token; + + if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token)) + return FALSE; + + RevertToSelf(); + + *old_token = token; + return TRUE; +} + +/* + * Revert to the specified access token for the current thread. When access + * token is specified as NULL then revert to the primary process access token. + * Use to revert after change_token() or change_token_to_primary() call. + */ +static VOID +revert_to_token(HANDLE token) +{ + /* + * If SetThreadToken() call fails then there is no option to revert to + * the specified previous thread access token. So in this case revert to + * the primary process access token. + */ + if (!token || !SetThreadToken(NULL, token)) + RevertToSelf(); + if (token) + CloseHandle(token); +} + +/* + * Enable particular privilege for the current thread. And set method how to + * revert this privilege (if to revert whole token or only privilege). + */ +static BOOL +enable_privilege(LUID luid_privilege, HANDLE *revert_token, BOOL *revert_only_privilege) +{ + HANDLE thread_token; + HANDLE new_token; + + if (OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &thread_token)) + { + if (set_privilege(thread_token, luid_privilege, TRUE)) + { + /* + * Indicate that correct revert method is just to + * disable privilege in access token. + */ + if (revert_token && revert_only_privilege) + { + *revert_token = thread_token; + *revert_only_privilege = TRUE; + } + else + { + CloseHandle(thread_token); + } + return TRUE; + } + CloseHandle(thread_token); + /* + * If enabling privilege failed then try to enable it via + * primary process access token. + */ + } + + /* + * If the current thread has already active thread access token then + * open it with just impersonate right as it would be used only for + * future revert. + */ + if (revert_token && revert_only_privilege) + { + if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &thread_token)) + { + if (GetLastError() != ERROR_NO_TOKEN) + return FALSE; + thread_token = NULL; + } + + /* + * If current thread has no access token (and uses primary + * process access token) or it does not have permission to + * adjust privileges or it does not have specified privilege + * then create a copy of the primary process access token, + * assign it for the current thread (= impersonate self) + * and then try adjusting privilege again. + */ + if (!ImpersonateSelf(SecurityImpersonation)) + { + if (thread_token) + CloseHandle(thread_token); + return FALSE; + } + } + + if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &new_token)) + { + /* thread_token is set only when we were asked for revert method. */ + if (revert_token && revert_only_privilege) + revert_to_token(thread_token); + return FALSE; + } + + if (!set_privilege(new_token, luid_privilege, TRUE)) + { + CloseHandle(new_token); + /* thread_token is set only when we were asked for revert method. */ + if (revert_token && revert_only_privilege) + revert_to_token(thread_token); + return FALSE; + } + + /* + * Indicate that correct revert method is to change to the previous + * access token. Either to the primary process access token or to the + * previous thread access token. + */ + if (revert_token && revert_only_privilege) + { + *revert_token = thread_token; + *revert_only_privilege = FALSE; + } + return TRUE; +} + +/* + * Revert particular privilege for the current thread was previously enabled by + * enable_privilege() call. Either disable privilege in specified access token + * or revert to previous access token. + */ +static VOID +revert_privilege(LUID luid_privilege, HANDLE revert_token, BOOL revert_only_privilege) +{ + if (revert_only_privilege) + { + set_privilege(revert_token, luid_privilege, FALSE); + CloseHandle(revert_token); + } + else + { + revert_to_token(revert_token); + } +} + +/* + * Return owner of the access token used by the current thread. Buffer for + * returned owner needs to be released by LocalFree() call. + */ +static TOKEN_OWNER * +get_current_token_owner(VOID) +{ + HANDLE token; + DWORD length; + TOKEN_OWNER *owner; + + /* + * If the current thread does not have active access token then thread + * uses primary process access token for all permission checks. + */ + if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) && + (GetLastError() != ERROR_NO_TOKEN || + !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token))) + return NULL; + + if (!GetTokenInformation(token, TokenOwner, NULL, 0, &length) && + GetLastError() != ERROR_INSUFFICIENT_BUFFER) + { + CloseHandle(token); + return NULL; + } + +retry: + owner = (TOKEN_OWNER *)LocalAlloc(LPTR, length); + if (!owner) + { + CloseHandle(token); + return NULL; + } + + if (!GetTokenInformation(token, TokenOwner, owner, length, &length)) + { + /* + * Length of token owner (SID) buffer between two get calls may + * changes (e.g. by another thread of process), so retry. + */ + if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) + { + LocalFree(owner); + goto retry; + } + LocalFree(owner); + CloseHandle(token); + return NULL; + } + + CloseHandle(token); + return owner; +} + +/* + * Grant particular permissions in the primary access token of the specified + * process for the owner of current thread token and set old DACL of the + * process access token for reverting permissions. Security descriptor is + * just memory buffer for old DACL. + */ +static BOOL +grant_process_token_dacl_permissions(HANDLE process, DWORD permissions, HANDLE *token, PACL *old_dacl, PSECURITY_DESCRIPTOR *security_descriptor) +{ + GetSecurityInfoProt MyGetSecurityInfo; + SetSecurityInfoProt MySetSecurityInfo; + SetEntriesInAclProt MySetEntriesInAcl; + EXPLICIT_ACCESS explicit_access; + TOKEN_OWNER *owner; + HMODULE advapi32; + PACL new_dacl; + + /* + * This source file already uses advapi32.dll library, so it is + * linked to executable and automatically loaded when starting + * current running process. + */ + advapi32 = GetModuleHandle(TEXT("advapi32.dll")); + if (!advapi32) + return FALSE; + + /* + * It does not matter if SetEntriesInAclA() or SetEntriesInAclW() is + * called as no string is passed to SetEntriesInAcl function. + */ + MyGetSecurityInfo = (GetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "GetSecurityInfo"); + MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo"); + MySetEntriesInAcl = (SetEntriesInAclProt)(LPVOID)GetProcAddress(advapi32, "SetEntriesInAclA"); + if (!MyGetSecurityInfo || !MySetSecurityInfo || !MySetEntriesInAcl) + return FALSE; + + owner = get_current_token_owner(); + if (!owner) + return FALSE; + + /* + * READ_CONTROL is required for GetSecurityInfo(DACL_SECURITY_INFORMATION) + * and WRITE_DAC is required for SetSecurityInfo(DACL_SECURITY_INFORMATION). + */ + if (!OpenProcessToken(process, READ_CONTROL | WRITE_DAC, token)) + { + LocalFree(owner); + return FALSE; + } + + if (MyGetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL, security_descriptor) != ERROR_SUCCESS) + { + LocalFree(owner); + CloseHandle(*token); + return FALSE; + } + + /* + * Set new explicit access for the owner of the current thread access + * token with non-inherited granting access to specified permissions. + */ + explicit_access.grfAccessPermissions = permissions; + explicit_access.grfAccessMode = GRANT_ACCESS; + explicit_access.grfInheritance = NO_PROPAGATE_INHERIT_ACE; + explicit_access.Trustee.pMultipleTrustee = NULL; + explicit_access.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE; + explicit_access.Trustee.TrusteeForm = TRUSTEE_IS_SID; + explicit_access.Trustee.TrusteeType = TRUSTEE_IS_USER; + /* + * Unfortunately i586-mingw32msvc toolchain does not have pSid pointer + * member in Trustee union. So assign owner SID to ptstrName pointer + * member which aliases with pSid pointer member in the same union. + */ + explicit_access.Trustee.ptstrName = (PVOID)owner->Owner; + + if (MySetEntriesInAcl(1, &explicit_access, *old_dacl, &new_dacl) != ERROR_SUCCESS) + { + LocalFree(*security_descriptor); + LocalFree(owner); + CloseHandle(*token); + return FALSE; + } + + if (MySetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, new_dacl, NULL) != ERROR_SUCCESS) + { + LocalFree(*security_descriptor); + LocalFree(owner); + CloseHandle(*token); + return FALSE; + } + + LocalFree(owner); + return TRUE; +} + +/* + * Revert particular granted permissions in specified access token done by + * grant_process_token_dacl_permissions() call. + */ +static VOID +revert_token_dacl_permissions(HANDLE token, PACL old_dacl, PSECURITY_DESCRIPTOR security_descriptor) +{ + SetSecurityInfoProt MySetSecurityInfo; + HMODULE advapi32; + + /* + * This source file already uses advapi32.dll library, so it is + * linked to executable and automatically loaded when starting + * current running process. + */ + advapi32 = GetModuleHandle(TEXT("advapi32.dll")); + if (advapi32) + { + MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo"); + MySetSecurityInfo(token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL); + } + + LocalFree(security_descriptor); + CloseHandle(token); +} + +/* + * Change error mode of the current thread. If it is not possible then change + * error mode of the whole process. Always returns previous error mode. + */ +static UINT +change_error_mode(UINT new_mode) +{ + SetThreadErrorModeProt MySetThreadErrorMode = NULL; + HMODULE kernel32; + DWORD old_mode; + + /* + * Function SetThreadErrorMode() was introduced in Windows 7, so use + * GetProcAddress() for compatibility with older systems. + */ + kernel32 = GetModuleHandle(TEXT("kernel32.dll")); + if (kernel32) + MySetThreadErrorMode = (SetThreadErrorModeProt)(LPVOID)GetProcAddress(kernel32, "SetThreadErrorMode"); + + if (MySetThreadErrorMode && + MySetThreadErrorMode(new_mode, &old_mode)) + return old_mode; + + /* + * Fallback to function SetErrorMode() which modifies error mode of the + * whole process and returns old mode. + */ + return SetErrorMode(new_mode); +} + +/* + * Open process handle specified by the process id with the query right and + * optionally also with vm read right. + */ +static HANDLE +open_process_for_query(DWORD pid, BOOL with_vm_read) +{ + BOOL revert_only_privilege; + LUID luid_debug_privilege; + OSVERSIONINFO version; + DWORD process_right; + HANDLE revert_token; + HANDLE process; + + /* + * Some processes on Windows Vista and higher systems can be opened only + * with PROCESS_QUERY_LIMITED_INFORMATION right. This right is enough + * for accessing primary process token. But this right is not supported + * on older pre-Vista systems. When the current thread on these older + * systems does not have Debug privilege then OpenProcess() fails with + * ERROR_ACCESS_DENIED. If the current thread has Debug privilege then + * OpenProcess() success and returns handle to requested process. + * Problem is that this handle does not have PROCESS_QUERY_INFORMATION + * right and so cannot be used for accessing primary process token + * on those older systems. Moreover it has zero rights and therefore + * such handle is fully useless. So never try to use open process with + * PROCESS_QUERY_LIMITED_INFORMATION right on older systems than + * Windows Vista (NT 6.0). + */ + version.dwOSVersionInfoSize = sizeof(version); + if (GetVersionEx(&version) && + version.dwPlatformId == VER_PLATFORM_WIN32_NT && + version.dwMajorVersion >= 6) + process_right = PROCESS_QUERY_LIMITED_INFORMATION; + else + process_right = PROCESS_QUERY_INFORMATION; + + if (with_vm_read) + process_right |= PROCESS_VM_READ; + + process = OpenProcess(process_right, FALSE, pid); + if (process) + return process; + + /* + * It is possible to open only processes to which owner of the current + * thread access token has permissions. For opening other processing it + * is required to have Debug privilege enabled. By default local + * administrators have this privilege, but it is disabled. So try to + * enable it and then try to open process again. + */ + + if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid_debug_privilege)) + return NULL; + + if (!enable_privilege(luid_debug_privilege, &revert_token, &revert_only_privilege)) + return NULL; + + process = OpenProcess(process_right, FALSE, pid); + + revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege); + + return process; +} + +/* + * Check if process image path name (wide string) matches exe file name + * (7-bit ASCII string). Do case-insensitive string comparison. Process + * image path name can be in any namespace format (DOS, Win32, UNC, ...). + */ +static BOOL +check_process_name(LPCWSTR path, DWORD path_length, LPCSTR exe_file) +{ + DWORD exe_file_length; + WCHAR c1; + UCHAR c2; + DWORD i; + + exe_file_length = 0; + while (exe_file[exe_file_length] != '\0') + exe_file_length++; + + /* Path must have backslash before exe file name. */ + if (exe_file_length >= path_length || + path[path_length-exe_file_length-1] != L'\\') + return FALSE; + + for (i = 0; i < exe_file_length; i++) + { + c1 = path[path_length-exe_file_length+i]; + c2 = exe_file[i]; + /* + * Input string for comparison is 7-bit ASCII and file name part + * of path must not contain backslash as it is path separator. + */ + if (c1 >= 0x80 || c2 >= 0x80 || c1 == L'\\') + return FALSE; + if (c1 >= L'a' && c1 <= L'z') + c1 -= L'a' - L'A'; + if (c2 >= 'a' && c2 <= 'z') + c2 -= 'a' - 'A'; + if (c1 != c2) + return FALSE; + } + + return TRUE; +} + +/* Open process handle with the query right specified by process exe file. */ +static HANDLE +find_and_open_process_for_query(LPCSTR exe_file) +{ + GetProcessImageFileNameWProt MyGetProcessImageFileNameW; + GetModuleFileNameExWProt MyGetModuleFileNameExW; + EnumProcessesProt MyEnumProcesses; + HMODULE kernel32, psapi; + UINT prev_error_mode; + WCHAR path[MAX_PATH]; + DWORD size, length; + DWORD *processes; + HANDLE process; + DWORD count; + DWORD i; + + psapi = NULL; + kernel32 = GetModuleHandle(TEXT("kernel32.dll")); + if (!kernel32) + return NULL; + + /* + * On Windows 7 and higher systems these functions are available in + * kernel32.dll library with K32 prefix. + */ + MyGetModuleFileNameExW = NULL; + MyGetProcessImageFileNameW = (GetProcessImageFileNameWProt)(LPVOID)GetProcAddress(kernel32, "K32GetProcessImageFileNameW"); + MyEnumProcesses = (EnumProcessesProt)(LPVOID)GetProcAddress(kernel32, "K32EnumProcesses"); + if (!MyGetProcessImageFileNameW || !MyEnumProcesses) + { + /* + * On older NT-based systems these functions are available in + * psapi.dll library without K32 prefix. + */ + prev_error_mode = change_error_mode(SEM_FAILCRITICALERRORS); + psapi = LoadLibrary(TEXT("psapi.dll")); + change_error_mode(prev_error_mode); + + if (!psapi) + return NULL; + + /* + * Function GetProcessImageFileNameW() is available in + * Windows XP and higher systems. On older versions is + * available function GetModuleFileNameExW(). + */ + MyGetProcessImageFileNameW = (GetProcessImageFileNameWProt)(LPVOID)GetProcAddress(psapi, "GetProcessImageFileNameW"); + MyGetModuleFileNameExW = (GetModuleFileNameExWProt)(LPVOID)GetProcAddress(psapi, "GetModuleFileNameExW"); + MyEnumProcesses = (EnumProcessesProt)(LPVOID)GetProcAddress(psapi, "EnumProcesses"); + if ((!MyGetProcessImageFileNameW && !MyGetModuleFileNameExW) || !MyEnumProcesses) + { + FreeLibrary(psapi); + return NULL; + } + } + + /* Make initial buffer size for 1024 processes. */ + size = 1024 * sizeof(*processes); + +retry: + processes = (DWORD *)LocalAlloc(LPTR, size); + if (!processes) + { + if (psapi) + FreeLibrary(psapi); + return NULL; + } + + if (!MyEnumProcesses(processes, size, &length)) + { + LocalFree(processes); + if (psapi) + FreeLibrary(psapi); + return NULL; + } + else if (size == length) + { + /* + * There is no indication given when the buffer is too small to + * store all process identifiers. Therefore if returned length + * is same as buffer size there can be more processes. Call + * again with larger buffer. + */ + LocalFree(processes); + size *= 2; + goto retry; + } + + process = NULL; + count = length / sizeof(*processes); + + for (i = 0; i < count; i++) + { + /* Skip System Idle Process. */ + if (processes[i] == 0) + continue; + + /* + * Function GetModuleFileNameExW() requires additional + * PROCESS_VM_READ right as opposite to function + * GetProcessImageFileNameW() which does not need it. + */ + process = open_process_for_query(processes[i], MyGetProcessImageFileNameW ? FALSE : TRUE); + if (!process) + continue; + + if (MyGetProcessImageFileNameW) + length = MyGetProcessImageFileNameW(process, path, sizeof(path)/sizeof(*path)); + else + length = MyGetModuleFileNameExW(process, NULL, path, sizeof(path)/sizeof(*path)); + if (length && check_process_name(path, length, exe_file)) + break; + + CloseHandle(process); + process = NULL; + } + + LocalFree(processes); + + if (psapi) + FreeLibrary(psapi); + + return process; +} + +/* + * Try to open primary access token of the particular process with specified + * rights. Before opening access token try to adjust DACL permissions of the + * primary process access token, so following open does not fail on error + * related to no open permissions. Revert DACL permissions after open attempt. + * As following steps are not atomic, try to execute them more times in case + * of possible race conditions caused by other threads or processes. + */ +static HANDLE +try_grant_permissions_and_open_process_token(HANDLE process, DWORD rights) +{ + PSECURITY_DESCRIPTOR security_descriptor; + HANDLE grant_token; + PACL old_dacl; + HANDLE token; + DWORD retry; + DWORD error; + + /* + * This code is not atomic. Between grant and open calls can other + * thread or process change or revert permissions. So try to execute + * it more times. + */ + for (retry = 0; retry < 10; retry++) + { + if (!grant_process_token_dacl_permissions(process, rights, &grant_token, &old_dacl, &security_descriptor)) + return NULL; + if (!OpenProcessToken(process, rights, &token)) + { + token = NULL; + error = GetLastError(); + } + revert_token_dacl_permissions(grant_token, old_dacl, security_descriptor); + if (token) + return token; + else if (error != ERROR_ACCESS_DENIED) + return NULL; + } + + return NULL; +} + +/* + * Open primary access token of particular process handle with specified rights. + * If permissions for specified rights are missing then try to grant them. + */ +static HANDLE +open_process_token_with_rights(HANDLE process, DWORD rights) +{ + HANDLE old_token; + HANDLE token; + + /* First try to open primary access token of process handle directly. */ + if (OpenProcessToken(process, rights, &token)) + return token; + + /* + * If opening failed then it means that owner of the current thread + * access token does not have permission for it. Try it again with + * primary process access token. + */ + if (change_token_to_primary(&old_token)) + { + if (!OpenProcessToken(process, rights, &token)) + token = NULL; + revert_to_token(old_token); + if (token) + return token; + } + + /* + * If opening is still failing then try to grant specified permissions + * for the current thread and try to open it again. + */ + token = try_grant_permissions_and_open_process_token(process, rights); + if (token) + return token; + + /* + * And if it is still failing then try it again with granting + * permissions for the primary process token of the current process. + */ + if (change_token_to_primary(&old_token)) + { + token = try_grant_permissions_and_open_process_token(process, rights); + revert_to_token(old_token); + if (token) + return token; + } + + /* + * TODO: Sorry, no other option for now... + * It could be possible to use Take Ownership Name privilege to + * temporary change token owner of specified process to the owner of + * the current thread token, grant permissions for current thread in + * that process token, change ownership back to original one, open + * that process token and revert granted permissions. But this is + * not implemented yet. + */ + return NULL; +} + +/* + * Set x86 I/O Privilege Level to 3 for the whole current NT process. Do it via + * NtSetInformationProcess() call with ProcessUserModeIOPL information class, + * which is supported by 32-bit Windows NT kernel versions and requires Tcb + * privilege. + */ +static BOOL +SetProcessUserModeIOPL(VOID) +{ + NtSetInformationProcessProt MyNtSetInformationProcess; + + LUID luid_tcb_privilege; + LUID luid_impersonate_privilege; + + HANDLE revert_token_tcb_privilege; + BOOL revert_only_tcb_privilege; + + HANDLE revert_token_impersonate_privilege; + BOOL revert_only_impersonate_privilege; + + BOOL impersonate_privilege_enabled; + + BOOL revert_to_old_token; + HANDLE old_token; + + HANDLE lsass_process; + HANDLE lsass_token; + + UINT prev_error_mode; + NTSTATUS nt_status; + HMODULE ntdll; + BOOL ret; + + impersonate_privilege_enabled = FALSE; + revert_to_old_token = FALSE; + lsass_token = NULL; + + /* Fast path when ProcessUserModeIOPL was already called. */ + if (read_iopl() == 3) + return TRUE; + + /* + * Load ntdll.dll library with disabled critical-error-handler message box. + * It means that NT kernel does not show unwanted GUI message box to user + * when LoadLibrary() function fails. + */ + prev_error_mode = change_error_mode(SEM_FAILCRITICALERRORS); + ntdll = LoadLibrary(TEXT("ntdll.dll")); + change_error_mode(prev_error_mode); + if (!ntdll) + goto err_not_implemented; + + /* Retrieve pointer to NtSetInformationProcess() function. */ + MyNtSetInformationProcess = (NtSetInformationProcessProt)(LPVOID)GetProcAddress(ntdll, "NtSetInformationProcess"); + if (!MyNtSetInformationProcess) + goto err_not_implemented; + + /* + * ProcessUserModeIOPL is syscall for NT kernel to change x86 IOPL + * of the current running process to 3. + * + * Process handle argument for ProcessUserModeIOPL is ignored and + * IOPL is always changed for the current running process. So pass + * GetCurrentProcess() handle for documentation purpose. Process + * information buffer and length are unused for ProcessUserModeIOPL. + * + * ProcessUserModeIOPL may success (return value >= 0) or may fail + * because it is not implemented or because of missing privilege. + * Other errors are not defined, so handle them as unknown. + */ + nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0); + if (nt_status >= 0) + goto verify; + else if (nt_status == STATUS_NOT_IMPLEMENTED) + goto err_not_implemented; + else if (nt_status != STATUS_PRIVILEGE_NOT_HELD) + goto err_unknown; + + /* + * If ProcessUserModeIOPL call failed with STATUS_PRIVILEGE_NOT_HELD + * error then it means that the current thread token does not have + * Tcb privilege enabled. Try to enable it. + */ + + if (!LookupPrivilegeValue(NULL, SE_TCB_NAME, &luid_tcb_privilege)) + goto err_not_implemented; + + /* + * If the current thread has already Tcb privilege enabled then there + * is some additional unhanded restriction. + */ + if (have_privilege(luid_tcb_privilege)) + goto err_privilege_not_held; + + /* Try to enable Tcb privilege and try ProcessUserModeIOPL call again. */ + if (enable_privilege(luid_tcb_privilege, &revert_token_tcb_privilege, &revert_only_tcb_privilege)) + { + nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0); + revert_privilege(luid_tcb_privilege, revert_token_tcb_privilege, revert_only_tcb_privilege); + if (nt_status >= 0) + goto verify; + else if (nt_status == STATUS_NOT_IMPLEMENTED) + goto err_not_implemented; + else if (nt_status == STATUS_PRIVILEGE_NOT_HELD) + goto err_privilege_not_held; + else + goto err_unknown; + } + + /* + * If enabling of Tcb privilege failed then it means that current thread + * does not this privilege. But current process may have it. So try it + * again with primary process access token. + */ + + /* + * If system supports Impersonate privilege (Windows 2000 SP4 or higher) then + * all future actions in this function require this Impersonate privilege. + * So try to enable it in case it is currently disabled. + */ + if (LookupPrivilegeValue(NULL, SE_IMPERSONATE_NAME, &luid_impersonate_privilege) && + !have_privilege(luid_impersonate_privilege)) + { + /* + * If current thread does not have Impersonate privilege enabled + * then first try to enable it just for the current thread. If + * it is not possible to enable it just for the current thread + * then try it to enable globally for whole process (which + * affects all process threads). Both actions will be reverted + * at the end of this function. + */ + if (enable_privilege(luid_impersonate_privilege, &revert_token_impersonate_privilege, &revert_only_impersonate_privilege)) + { + impersonate_privilege_enabled = TRUE; + } + else if (enable_privilege(luid_impersonate_privilege, NULL, NULL)) + { + impersonate_privilege_enabled = TRUE; + revert_token_impersonate_privilege = NULL; + revert_only_impersonate_privilege = TRUE; + } + else + { + goto err_privilege_not_held; + } + + /* + * Now when Impersonate privilege is enabled, try to enable Tcb + * privilege again. Enabling other privileges for the current + * thread requires Impersonate privilege, so enabling Tcb again + * could now pass. + */ + if (enable_privilege(luid_tcb_privilege, &revert_token_tcb_privilege, &revert_only_tcb_privilege)) + { + nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0); + revert_privilege(luid_tcb_privilege, revert_token_tcb_privilege, revert_only_tcb_privilege); + if (nt_status >= 0) + goto verify; + else if (nt_status == STATUS_NOT_IMPLEMENTED) + goto err_not_implemented; + else if (nt_status == STATUS_PRIVILEGE_NOT_HELD) + goto err_privilege_not_held; + else + goto err_unknown; + } + } + + /* + * If enabling Tcb privilege failed then it means that the current + * thread access token does not have this privilege or does not + * have permission to adjust privileges. + * + * Try to use more privileged token from Local Security Authority + * Subsystem Service process (lsass.exe) which has Tcb privilege. + * Retrieving this more privileged token is possible for local + * administrators (unless it was disabled by local administrators). + */ + + lsass_process = find_and_open_process_for_query("lsass.exe"); + if (!lsass_process) + goto err_privilege_not_held; + + /* + * Open primary lsass.exe process access token with query and duplicate + * rights. Just these two rights are required for impersonating other + * primary process token (impersonate right is really not required!). + */ + lsass_token = open_process_token_with_rights(lsass_process, TOKEN_QUERY | TOKEN_DUPLICATE); + + CloseHandle(lsass_process); + + if (!lsass_token) + goto err_privilege_not_held; + + /* + * After successful open of the primary lsass.exe process access token, + * assign its copy for the current thread. + */ + if (!change_token(lsass_token, &old_token)) + goto err_privilege_not_held; + + revert_to_old_token = TRUE; + + nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0); + if (nt_status == STATUS_PRIVILEGE_NOT_HELD) + { + /* + * Now current thread is not using primary process token anymore + * but is using custom access token. There is no need to revert + * enabled Tcb privilege as the whole custom access token would + * be reverted. So there is no need to setup revert method for + * enabling privilege. + */ + if (have_privilege(luid_tcb_privilege) || + !enable_privilege(luid_tcb_privilege, NULL, NULL)) + goto err_privilege_not_held; + nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0); + } + if (nt_status >= 0) + goto verify; + else if (nt_status == STATUS_NOT_IMPLEMENTED) + goto err_not_implemented; + else if (nt_status == STATUS_PRIVILEGE_NOT_HELD) + goto err_privilege_not_held; + else + goto err_unknown; + +verify: + /* + * Some Windows NT kernel versions (e.g. Windows 2003 x64) do not + * implement ProcessUserModeIOPL syscall at all but incorrectly + * returns success when it is called by user process. So always + * after this call verify that IOPL is set to 3. + */ + if (read_iopl() != 3) + goto err_not_implemented; + ret = TRUE; + goto ret; + +err_not_implemented: + SetLastError(ERROR_INVALID_FUNCTION); + ret = FALSE; + goto ret; + +err_privilege_not_held: + SetLastError(ERROR_PRIVILEGE_NOT_HELD); + ret = FALSE; + goto ret; + +err_unknown: + SetLastError(ERROR_GEN_FAILURE); + ret = FALSE; + goto ret; + +ret: + if (revert_to_old_token) + revert_to_token(old_token); + + if (impersonate_privilege_enabled) + revert_privilege(luid_impersonate_privilege, revert_token_impersonate_privilege, revert_only_impersonate_privilege); + + if (lsass_token) + CloseHandle(lsass_token); + + if (ntdll) + FreeLibrary(ntdll); + + return ret; +} + static int intel_setup_io(struct pci_access *a) { - typedef int (*MYPROC)(void); - MYPROC InitializeWinIo; - HMODULE lib; - #ifndef _WIN64 /* 16/32-bit non-NT systems allow applications to access PCI I/O ports without any special setup. */ OSVERSIONINFOA version; @@ -115,35 +1279,25 @@ intel_setup_io(struct pci_access *a) } #endif - lib = LoadLibrary("WinIo.dll"); - if (!lib) - { - a->warning("i386-io-windows: Couldn't load WinIo.dll."); - return 0; - } - /* XXX: Is this really needed? --mj */ - GetProcAddress(lib, "InitializeWinIo"); - - InitializeWinIo = (MYPROC) GetProcAddress(lib, "InitializeWinIo"); - if (!InitializeWinIo) - { - a->warning("i386-io-windows: Couldn't find InitializeWinIo function."); - return 0; - } - - if (!InitializeWinIo()) + /* On NT-based systems issue ProcessUserModeIOPL syscall which changes IOPL to 3. */ + if (!SetProcessUserModeIOPL()) { - a->warning("i386-io-windows: InitializeWinIo() failed."); + a->warning("NT ProcessUserModeIOPL call failed with error: %lu.", (unsigned long int)GetLastError()); return 0; } + a->debug("NT ProcessUserModeIOPL call succeeded..."); return 1; } static inline int intel_cleanup_io(struct pci_access *a UNUSED) { - //TODO: DeInitializeWinIo! + /* + * 16/32-bit non-NT systems do not use any special setup and on NT-based + * systems ProcessUserModeIOPL permanently changes IOPL to 3 for the current + * NT process, no revert for current process is possible. + */ return 1; } |