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/* vi: set sw=4 ts=4: */
/*
* Mini su implementation for busybox-w32
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config SUW32
//config: bool "su for Microsoft Windows"
//config: default y
//config: depends on PLATFORM_MINGW32 && ASH
//config: help
//config: su runs a shell with elevated privileges.
//applet:IF_SUW32(APPLET_ODDNAME(su, suw32, BB_DIR_BIN, BB_SUID_DROP, suw32))
//kbuild:lib-$(CONFIG_SUW32) += suw32.o
//usage:#define suw32_trivial_usage
//usage: "[-tW] [-N|-s SHELL] [root]\n"
//usage: "or: su [-tW] [-N|-s SHELL] -c CMD_STRING [[--] root [ARG0 [ARG...]]]\n"
//usage: "or: su [-tW] [-N|-s SHELL] [--] root [arbitrary sh arguments]"
//usage:#define suw32_full_usage "\n\n"
//usage: "Run shell with elevated privileges\n"
//usage: "\n -c CMD Command to pass to 'sh -c'"
//usage: "\n -s SHELL Use specified shell"
//usage: "\n -N Don't close console when shell exits"
//usage: "\n -t Test mode, no elevation, implies -W"
//usage: "\n -W Wait for shell exit code"
#include "libbb.h"
#include "lazyload.h"
enum {
OPT_c = (1 << 0),
OPT_s = (1 << 1),
OPT_t = (1 << 2),
OPT_N = (1 << 3),
OPT_W = (1 << 4)
};
#define test_mode (opt & OPT_t)
int suw32_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int suw32_main(int argc UNUSED_PARAM, char **argv)
{
int ret = 0;
unsigned opt;
char *opt_command = NULL;
char *opt_shell = NULL;
SHELLEXECUTEINFO info;
char *bb_path, *cwd, *realcwd, *q, *args;
DECLARE_PROC_ADDR(BOOL, ShellExecuteExA, SHELLEXECUTEINFOA *);
opt = getopt32(argv, "^c:s:tNW" "\0" "s--N:N--s", &opt_command, &opt_shell);
argv += optind;
if (argv[0]) {
if (!test_mode && strcmp(argv[0], "root") != 0) {
bb_error_msg_and_die("unknown user '%s'", argv[0]);
}
++argv;
}
#if ENABLE_DROP || ENABLE_CDROP || ENABLE_PDROP
// If privilege has been dropped (ELEVATED_PRIVILEGE but not
// ADMIN_ENABLED) ShellExecuteEx() thinks we already have elevated
// privilege and doesn't raise privilege. In that case, give up.
if (!test_mode && elevation_state() == ELEVATED_PRIVILEGE) {
xfunc_error_retval = 2;
bb_error_msg_and_die("unable to restore privilege");
}
#endif
/* ShellExecuteEx() needs backslash as separator in UNC paths. */
if (opt_shell) {
bb_path = file_is_win32_exe(opt_shell);
if (!bb_path)
bb_error_msg_and_die("%s: Not found", opt_shell);
args = NULL;
} else {
bb_path = xstrdup(bb_busybox_exec_path);
args = xstrdup("--busybox ash");
if (!test_mode)
args = xappendword(args, "-t \"BusyBox ash (Admin)\"");
}
slash_to_bs(bb_path);
memset(&info, 0, sizeof(SHELLEXECUTEINFO));
info.cbSize = sizeof(SHELLEXECUTEINFO);
/* info.fMask = SEE_MASK_DEFAULT; */
if (opt & (OPT_t|OPT_W))
info.fMask |= SEE_MASK_NOCLOSEPROCESS;
if (test_mode)
info.fMask |= SEE_MASK_NO_CONSOLE;
/* info.hwnd = NULL; */
info.lpVerb = !test_mode ? "runas" : "open";
info.lpFile = bb_path;
/*
* It seems that when ShellExecuteEx() runs binaries residing in
* certain 'system' directories it sets the current directory of
* the process to %SYSTEMROOT%\System32. Override this by passing
* the directory we want to the shell.
*
* Canonicalise the directory now: if it's in a drive mapped to
* a network share it may not be available once we have elevated
* privileges.
*/
if (opt_shell == NULL) {
cwd = getcwd(NULL, 0);
realcwd = cwd ? xmalloc_realpath(cwd) : NULL;
if (realcwd || cwd) {
args = xappendword(args, "-d");
q = quote_arg(realcwd ?: cwd);
args = xappendword(args, q);
free(q);
}
}
if (opt & OPT_N)
args = xappendword(args, "-N");
if (opt_command) {
args = xappendword(args,
(opt_shell && strcasecmp(bb_basename(bb_path), "cmd.exe") == 0) ?
"/c" : "-c");
q = quote_arg(opt_command);
args = xappendword(args, q);
free(q);
}
while (*argv) {
q = quote_arg(*argv++);
args = xappendword(args, q);
free(q);
}
info.lpParameters = args;
/* info.lpDirectory = NULL; */
info.nShow = SW_SHOWNORMAL;
if (!INIT_PROC_ADDR(shell32.dll, ShellExecuteExA)) {
ret = -1;
goto end;
}
if (!ShellExecuteExA(&info)) {
ret = 1;
goto end;
}
if (opt & (OPT_t|OPT_W)) {
DWORD r;
WaitForSingleObject(info.hProcess, INFINITE);
if (!GetExitCodeProcess(info.hProcess, &r))
ret = 1;
else
ret = exit_code_to_posix(r);
CloseHandle(info.hProcess);
}
end:
if (ENABLE_FEATURE_CLEAN_UP) {
free(bb_path);
free(cwd);
free(realcwd);
free(args);
}
return ret;
}
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