mirror of git://git.zx2c4.com/wireguard-tools
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <windows.h>
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#include <tlhelp32.h>
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#include <accctrl.h>
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#include <aclapi.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#include <hashtable.h>
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static FILE *userspace_interface_file(const char *iface)
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{
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char fname[MAX_PATH];
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HANDLE pipe_handle;
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SID expected_sid;
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DWORD bytes = sizeof(expected_sid);
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PSID pipe_sid;
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PSECURITY_DESCRIPTOR pipe_sd;
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bool equal;
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int fd;
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if (!CreateWellKnownSid(WinLocalSystemSid, NULL, &expected_sid, &bytes))
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goto err;
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snprintf(fname, sizeof(fname), "\\\\.\\pipe\\ProtectedPrefix\\Administrators\\WireGuard\\%s", iface);
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pipe_handle = CreateFileA(fname, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (pipe_handle == INVALID_HANDLE_VALUE)
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goto err;
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if (GetSecurityInfo(pipe_handle, SE_FILE_OBJECT, OWNER_SECURITY_INFORMATION, &pipe_sid, NULL, NULL, NULL, &pipe_sd) != ERROR_SUCCESS)
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goto err_close;
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equal = EqualSid(&expected_sid, pipe_sid);
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LocalFree(pipe_sd);
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if (!equal)
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goto err_close;
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fd = _open_osfhandle((intptr_t)pipe_handle, _O_RDWR);
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if (fd == -1) {
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CloseHandle(pipe_handle);
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return NULL;
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}
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return _fdopen(fd, "r+");
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err_close:
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CloseHandle(pipe_handle);
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err:
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errno = EACCES;
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return NULL;
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}
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static bool have_cached_interfaces;
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static struct hashtable cached_interfaces;
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static bool userspace_has_wireguard_interface(const char *iface)
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{
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char fname[MAX_PATH];
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WIN32_FIND_DATA find_data;
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HANDLE find_handle;
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bool ret = false;
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if (have_cached_interfaces)
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return hashtable_find_entry(&cached_interfaces, iface) != NULL;
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snprintf(fname, sizeof(fname), "ProtectedPrefix\\Administrators\\WireGuard\\%s", iface);
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find_handle = FindFirstFile("\\\\.\\pipe\\*", &find_data);
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if (find_handle == INVALID_HANDLE_VALUE)
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return -EIO;
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do {
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if (!strcmp(fname, find_data.cFileName)) {
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ret = true;
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break;
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}
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} while (FindNextFile(find_handle, &find_data));
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FindClose(find_handle);
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return ret;
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}
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static int userspace_get_wireguard_interfaces(struct string_list *list)
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{
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static const char prefix[] = "ProtectedPrefix\\Administrators\\WireGuard\\";
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WIN32_FIND_DATA find_data;
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HANDLE find_handle;
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char *iface;
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int ret = 0;
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find_handle = FindFirstFile("\\\\.\\pipe\\*", &find_data);
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if (find_handle == INVALID_HANDLE_VALUE)
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return -EIO;
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do {
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if (strncmp(prefix, find_data.cFileName, strlen(prefix)))
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continue;
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iface = find_data.cFileName + strlen(prefix);
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ret = string_list_add(list, iface);
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if (ret < 0)
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goto out;
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if (!hashtable_find_or_insert_entry(&cached_interfaces, iface)) {
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ret = -errno;
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goto out;
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}
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} while (FindNextFile(find_handle, &find_data));
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have_cached_interfaces = true;
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out:
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FindClose(find_handle);
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return ret;
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}
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