458 lines
11 KiB
C
458 lines
11 KiB
C
/*
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* Author: NoMachine <developers@nomachine.com>
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*
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* Author: Bryan Berns <berns@uwalumni.com>
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* Normalized and optimized login routines and added support for
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* internet-linked accounts.
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*
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* Copyright (c) 2009, 2011 NoMachine
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* All rights reserved
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*
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* Support functions and system calls' replacements needed to let the
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* software run on Win32 based operating systems.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Windows.h>
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#include <stdio.h>
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#include <LM.h>
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#include <sddl.h>
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#include <DsGetDC.h>
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#define SECURITY_WIN32
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#include <security.h>
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#include "inc\pwd.h"
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#include "inc\grp.h"
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#include "inc\utf.h"
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#include "misc_internal.h"
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#include "debug.h"
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static struct passwd pw;
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static char* pw_shellpath = NULL;
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char* shell_command_option = NULL;
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char* shell_arguments = NULL;
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BOOLEAN arg_escape = TRUE;
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/* returns 0 on success, and -1 with errno set on failure */
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static int
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set_defaultshell()
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{
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HKEY reg_key = 0;
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int tmp_len, ret = -1;
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REGSAM mask = STANDARD_RIGHTS_READ | KEY_QUERY_VALUE | KEY_WOW64_64KEY;
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wchar_t path_buf[PATH_MAX], option_buf[32], arg_buf[PATH_MAX];
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char *pw_shellpath_local = NULL, *command_option_local = NULL, *shell_arguments_local = NULL;
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errno = 0;
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/* if already set, return success */
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if (pw_shellpath != NULL)
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return 0;
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path_buf[0] = L'\0';
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option_buf[0] = L'\0';
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arg_buf[0] = L'\0';
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tmp_len = _countof(path_buf);
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if ((RegOpenKeyExW(HKEY_LOCAL_MACHINE, SSH_REGISTRY_ROOT, 0, mask, ®_key) == ERROR_SUCCESS) &&
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(RegQueryValueExW(reg_key, L"DefaultShell", 0, NULL, (LPBYTE)path_buf, &tmp_len) == ERROR_SUCCESS) &&
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(path_buf[0] != L'\0')) {
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/* fetched default shell path from registry */
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tmp_len = _countof(option_buf);
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DWORD size = sizeof(DWORD);
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DWORD escape_option = 1;
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if (RegQueryValueExW(reg_key, L"DefaultShellCommandOption", 0, NULL, (LPBYTE)option_buf, &tmp_len) != ERROR_SUCCESS)
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option_buf[0] = L'\0';
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tmp_len = _countof(arg_buf);
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if (RegQueryValueExW(reg_key, L"DefaultShellArguments", 0, NULL, (LPBYTE)arg_buf, &tmp_len) != ERROR_SUCCESS)
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arg_buf[0] = L'\0';
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if (RegQueryValueExW(reg_key, L"DefaultShellEscapeArguments", 0, NULL, (LPBYTE)&escape_option, &size) == ERROR_SUCCESS)
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arg_escape = (escape_option != 0) ? TRUE : FALSE;
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} else {
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if (!GetSystemDirectoryW(path_buf, _countof(path_buf))) {
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errno = GetLastError();
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goto cleanup;
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}
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if (wcscat_s(path_buf, _countof(path_buf), L"\\cmd.exe") != 0)
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goto cleanup;
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}
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if ((pw_shellpath_local = utf16_to_utf8(path_buf)) == NULL)
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goto cleanup;
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if (option_buf[0] != L'\0')
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if ((command_option_local = utf16_to_utf8(option_buf)) == NULL)
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goto cleanup;
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if (arg_buf[0] != L'\0')
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if ((shell_arguments_local = utf16_to_utf8(arg_buf)) == NULL)
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goto cleanup;
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convertToBackslash(pw_shellpath_local);
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to_lower_case(pw_shellpath_local);
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pw_shellpath = pw_shellpath_local;
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pw_shellpath_local = NULL;
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shell_command_option = command_option_local;
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shell_arguments = shell_arguments_local;
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command_option_local = NULL;
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shell_arguments_local = NULL;
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ret = 0;
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cleanup:
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if (pw_shellpath_local)
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free(pw_shellpath_local);
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if (command_option_local)
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free(command_option_local);
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if (shell_arguments_local)
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free(shell_arguments_local);
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return ret;
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}
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int
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initialize_pw()
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{
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if (set_defaultshell() != 0)
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return -1;
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if (pw.pw_shell != pw_shellpath) {
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memset(&pw, 0, sizeof(pw));
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pw.pw_shell = pw_shellpath;
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pw.pw_passwd = "\0";
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/* pw_uid = 0 for root on Unix and SSH code has specific restrictions for root
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* that are not applicable in Windows */
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pw.pw_uid = 1;
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}
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return 0;
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}
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static void
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clean_pw()
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{
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if (pw.pw_name)
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free(pw.pw_name);
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if (pw.pw_dir)
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free(pw.pw_dir);
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pw.pw_name = NULL;
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pw.pw_dir = NULL;
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}
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static int
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reset_pw()
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{
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if (initialize_pw() != 0)
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return -1;
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clean_pw();
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return 0;
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}
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static struct passwd*
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get_passwd(const wchar_t * user_utf16, PSID sid)
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{
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wchar_t user_resolved[DNLEN + 1 + UNLEN + 1];
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struct passwd *ret = NULL;
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wchar_t *sid_string = NULL, *tmp = NULL, *user_utf16_modified = NULL;
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wchar_t reg_path[PATH_MAX], profile_home[PATH_MAX], profile_home_exp[PATH_MAX];
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DWORD reg_path_len = PATH_MAX;
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HKEY reg_key = 0;
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BYTE binary_sid[SECURITY_MAX_SID_SIZE];
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DWORD sid_size = ARRAYSIZE(binary_sid);
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WCHAR domain_name[DNLEN + 1] = L"";
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DWORD domain_name_size = DNLEN + 1;
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SID_NAME_USE account_type = 0;
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errno = 0;
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if (reset_pw() != 0)
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return NULL;
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/*
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* We support both "domain\user" and "domain/user" formats.
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* But win32 APIs only accept domain\user format so convert it.
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*/
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if (user_utf16) {
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user_utf16_modified = _wcsdup(user_utf16);
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if (!user_utf16_modified) {
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errno = ENOMEM;
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error("%s failed to duplicate %s", __func__, user_utf16);
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goto cleanup;
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}
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if (tmp = wcsstr(user_utf16_modified, L"/"))
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*tmp = L'\\';
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}
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/* skip forward lookup on name if sid was passed in */
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if (sid != NULL)
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CopySid(sizeof(binary_sid), binary_sid, sid);
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/* else attempt to lookup the account; this will verify the account is valid and
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* is will return its sid and the realm that owns it */
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else if(LookupAccountNameW(NULL, user_utf16_modified, binary_sid, &sid_size,
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domain_name, &domain_name_size, &account_type) == 0) {
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errno = ENOENT;
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debug("%s: LookupAccountName() failed: %d.", __FUNCTION__, GetLastError());
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goto cleanup;
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}
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/* convert the binary string to a string */
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if (ConvertSidToStringSidW((PSID) binary_sid, &sid_string) == FALSE) {
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errno = errno_from_Win32LastError();
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goto cleanup;
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}
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/* lookup the account name from the sid */
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WCHAR user_name[UNLEN + 1];
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DWORD user_name_length = ARRAYSIZE(user_name);
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domain_name_size = DNLEN + 1;
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if (LookupAccountSidW(NULL, binary_sid, user_name, &user_name_length,
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domain_name, &domain_name_size, &account_type) == 0) {
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errno = errno_from_Win32LastError();
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debug("%s: LookupAccountSid() failed: %d.", __FUNCTION__, GetLastError());
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goto cleanup;
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}
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/* verify passed account is actually a user account */
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if (account_type != SidTypeUser) {
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errno = ENOENT;
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debug3("%s: Invalid account type: %d.", __FUNCTION__, account_type);
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goto cleanup;
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}
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/* fetch the computer name so we can determine if the specified user is local or not */
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wchar_t computer_name[CNLEN + 1];
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DWORD computer_name_size = ARRAYSIZE(computer_name);
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if (GetComputerNameW(computer_name, &computer_name_size) == 0) {
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goto cleanup;
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}
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/* if standard local user name or system account, just use name without decoration */
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const SID_IDENTIFIER_AUTHORITY nt_authority = SECURITY_NT_AUTHORITY;
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if (((_wcsicmp(domain_name, computer_name) == 0) && (_wcsicmp(computer_name, user_name) != 0)) ||
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((memcmp(&nt_authority, GetSidIdentifierAuthority((PSID)binary_sid), sizeof(SID_IDENTIFIER_AUTHORITY)) == 0) &&
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(((SID*)binary_sid)->SubAuthority[0] == SECURITY_LOCAL_SYSTEM_RID))) {
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wcscpy_s(user_resolved, ARRAYSIZE(user_resolved), user_name);
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}
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/* put any other format in sam compatible format */
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else
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swprintf_s(user_resolved, ARRAYSIZE(user_resolved), L"%s\\%s", domain_name, user_name);
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/* if one of below fails, set profile path to Windows directory */
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if (swprintf_s(reg_path, PATH_MAX, L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\ProfileList\\%ls", sid_string) == -1 ||
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RegOpenKeyExW(HKEY_LOCAL_MACHINE, reg_path, 0, STANDARD_RIGHTS_READ | KEY_QUERY_VALUE | KEY_WOW64_64KEY, ®_key) != 0 ||
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RegQueryValueExW(reg_key, L"ProfileImagePath", 0, NULL, (LPBYTE)profile_home, ®_path_len) != 0 ||
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ExpandEnvironmentStringsW(profile_home, NULL, 0) > PATH_MAX ||
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ExpandEnvironmentStringsW(profile_home, profile_home_exp, PATH_MAX) == 0)
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if (GetWindowsDirectoryW(profile_home_exp, PATH_MAX) == 0) {
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debug3("GetWindowsDirectoryW failed with %d", GetLastError());
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errno = EOTHER;
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goto cleanup;
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}
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/* convert to utf8, make name lowercase, and assign to output structure*/
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_wcslwr_s(user_resolved, wcslen(user_resolved) + 1);
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if ((pw.pw_name = utf16_to_utf8(user_resolved)) == NULL ||
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(pw.pw_dir = utf16_to_utf8(profile_home_exp)) == NULL) {
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clean_pw();
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errno = ENOMEM;
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goto cleanup;
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}
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ret = &pw;
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cleanup:
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if (sid_string)
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LocalFree(sid_string);
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if (reg_key)
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RegCloseKey(reg_key);
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return ret;
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}
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static struct passwd*
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getpwnam_placeholder(const char* user) {
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wchar_t tmp_home[PATH_MAX];
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char *pw_name = NULL, *pw_dir = NULL;
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struct passwd* ret = NULL;
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if (GetWindowsDirectoryW(tmp_home, PATH_MAX) == 0) {
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debug3("GetWindowsDirectoryW failed with %d", GetLastError());
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errno = EOTHER;
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goto cleanup;
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}
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pw_name = _strdup(user);
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pw_dir = utf16_to_utf8(tmp_home);
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if (!pw_name || !pw_dir) {
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errno = ENOMEM;
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goto cleanup;
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}
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pw.pw_name = pw_name;
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pw_name = NULL;
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pw.pw_dir = pw_dir;
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pw_dir = NULL;
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ret = &pw;
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cleanup:
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if (pw_name)
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free(pw_name);
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if (pw_dir)
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free(pw_dir);
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return ret;
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}
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struct passwd*
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w32_getpwnam(const char *user_utf8)
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{
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struct passwd* ret = NULL;
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wchar_t * user_utf16 = NULL;
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user_utf16 = utf8_to_utf16(user_utf8);
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if (user_utf16 == NULL) {
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errno = ENOMEM;
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return NULL;
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}
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ret = get_passwd(user_utf16, NULL);
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if (ret != NULL)
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goto done;
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/* for unpriviliged user account, create placeholder and return*/
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if (_stricmp(user_utf8, "sshd") == 0) {
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ret = getpwnam_placeholder(user_utf8);
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goto done;
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}
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/* check if custom passwd auth is enabled */
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if (get_custom_lsa_package())
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ret = getpwnam_placeholder(user_utf8);
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done:
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if (user_utf16)
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free(user_utf16);
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return ret;
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}
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struct passwd*
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w32_getpwuid(uid_t uid)
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{
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struct passwd* ret = NULL;
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PSID cur_user_sid = NULL;
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if ((cur_user_sid = get_sid(NULL)) == NULL)
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goto cleanup;
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ret = get_passwd(NULL, cur_user_sid);
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cleanup:
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if (cur_user_sid)
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free(cur_user_sid);
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return ret;
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}
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char *
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group_from_gid(gid_t gid, int nogroup)
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{
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return "-";
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}
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char *
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user_from_uid(uid_t uid, int nouser)
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{
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return "-";
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}
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uid_t
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getuid(void)
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{
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return 1;
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}
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gid_t
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getgid(void)
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{
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return 0;
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}
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uid_t
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geteuid(void)
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{
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return 1;
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}
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gid_t
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getegid(void)
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{
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return 0;
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}
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int
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setuid(uid_t uid)
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{
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return 0;
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}
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int
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setgid(gid_t gid)
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{
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return 0;
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}
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int
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seteuid(uid_t uid)
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{
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return 0;
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}
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int
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setegid(gid_t gid)
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{
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return 0;
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}
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struct passwd *getpwent(void)
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{
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return NULL;
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}
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void setpwent(void)
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{
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return;
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}
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void
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endpwent(void)
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{
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return;
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} |