2 files changed, 68 insertions, 0 deletions

diff --git a/loginutils/su.c b/loginutils/su.c
index 41291ea8f..2e1b309b0 100644
--- a/loginutils/su.c
+++ b/loginutils/su.c
@@ -8,6 +8,7 @@
 //config:       bool "su (19 kb)"
 //config:       default y
 //config:       select FEATURE_SYSLOG
+//config:       depends on PLATFORM_POSIX
 //config:       help
 //config:       su is used to become another user during a login session.
 //config:       Invoked without a username, su defaults to becoming the super user.
diff --git a/loginutils/suw32.c b/loginutils/suw32.c
new file mode 100644
index 000000000..de29f423a
--- /dev/null
+++ b/loginutils/suw32.c
@@ -0,0 +1,67 @@
+/* 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:       "[-c \"CMD\"]"
+//usage:#define suw32_full_usage "\n\n"
+//usage:       "Run shell with elevated privileges\n"
+//usage:     "\n    -c CMD  Command to pass to 'sh -c'"
+
+#include "libbb.h"
+
+int suw32_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int suw32_main(int argc UNUSED_PARAM, char **argv)
+{
+        char *opt_command = NULL;
+        SHELLEXECUTEINFO info;
+        char *bb_path, *cwd;
+
+        getopt32(argv, "c:", &opt_command);
+        if (argv[optind])
+                bb_show_usage();
+
+        /* ShellExecuteEx() needs backslash as separator in UNC paths. */
+        bb_path = xstrdup(bb_busybox_exec_path);
+        slash_to_bs(bb_path);
+
+        memset(&info, 0, sizeof(SHELLEXECUTEINFO));
+        info.cbSize = sizeof(SHELLEXECUTEINFO);
+        /* info.fMask = SEE_MASK_DEFAULT; */
+        /* info.hwnd = NULL; */
+        info.lpVerb = "runas";
+        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.
+         */
+        cwd = xmalloc_realpath(getcwd(NULL, 0));
+        info.lpParameters =
+                xasprintf("--busybox ash -d \"%s\" -t \"BusyBox ash (Admin)\" ", cwd);
+        if (opt_command)
+                info.lpParameters =
+                        xasprintf("%s -s -c \"%s\"", info.lpParameters, opt_command);
+        /* info.lpDirectory = NULL; */
+        info.nShow = SW_SHOWNORMAL;
+
+        return !ShellExecuteEx(&info);
+}