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-rw-r--r--toys/pending/su.c118
1 files changed, 59 insertions, 59 deletions
diff --git a/toys/pending/su.c b/toys/pending/su.c
index f49bcb0f..eac149c8 100644
--- a/toys/pending/su.c
+++ b/toys/pending/su.c
@@ -3,8 +3,9 @@
* Copyright 2013 CE Strake <strake888@gmail.com>
*
* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/su.html
+ * TODO: log su attempts
-USE_SU(NEWTOY(su, "lmpc:s:", TOYFLAG_BIN))
+USE_SU(NEWTOY(su, "lmpc:s:", TOYFLAG_BIN|TOYFLAG_ROOTONLY))
config SU
bool "su"
@@ -12,15 +13,12 @@ config SU
help
usage: su [-lmp] [-c CMD] [-s SHELL] [USER [ARGS...]]
- Switch to given user, or root if not given, and call a shell with the given arguments.
+ Switch to user (or root) and run shell (with optional command line).
- options:
- -s shell to call
- -c command to pass to shell with -c
-
- flags:
- -l login shell
- -(m|p) preserve environment
+ -s shell to use
+ -c command to pass to shell with -c
+ -l login shell
+ -(m|p) preserve environment
*/
#define FOR_su
@@ -31,67 +29,69 @@ GLOBALS(
char *c;
)
-static void deny () {
- printf ("Denied\n");
- xexit ();
+static char *snapshot_env(char *name)
+{
+ char *s = getenv(name);
+
+ if (s) return xmsprintf("%s=%s", name, s);
+
+ return 0;
}
-void su_main () {
- char *name, *passhash, **argu, **argv;
+void su_main()
+{
+ char *name, *passhash = 0, **argu, **argv;
struct passwd *up;
struct spwd *shp;
- long ii;
- if (toys.optc && strcmp ("-", toys.optargs[0]) == 0) {
+ if (*toys.optargs && !strcmp("-", *toys.optargs)) {
toys.optflags |= FLAG_l;
- toys.optc--; toys.optargs++;
+ toys.optargs++;
}
- if (toys.optc) {
- name = toys.optargs[0];
- toys.optc--; toys.optargs++;
- }
+ if (*toys.optargs) name = *(toys.optargs++);
else name = "root";
- shp = getspnam (name);
- if (!shp) perror_exit ("can't find password");
-
- switch (shp -> sp_pwdp[0]) {
- case '!': deny ();
- case '$': break;
- default : error_exit ("bad password format");
- }
- if (read_password (toybuf, sizeof (toybuf), "Password: ") != 0) perror_exit ("can't read password");
+ if (!(shp = getspnam(name))) perror_exit("no '%s'", name);
+ if (*shp->sp_pwdp != '$') goto deny;
+ if (read_password(toybuf, sizeof(toybuf), "Password: ")) goto deny;
+ passhash = crypt(toybuf, shp->sp_pwdp);
+ memset(toybuf, 0, sizeof(toybuf));
+ if (!passhash || strcmp(passhash, shp->sp_pwdp)) goto deny;
+
+ up = xgetpwnam(name);
+ xsetuid(up->pw_uid);
+
+ argv = argu = xmalloc(sizeof(char *)*(toys.optc + 4));
+ *(argv++) = TT.s ? TT.s : up->pw_shell;
+
+ if (toys.optflags & FLAG_l) {
+ int i;
+ char *stuff[] = {snapshot_env("TERM"), snapshot_env("DISPLAY"),
+ snapshot_env("COLORTERM"), snapshot_env("XAUTHORITY")};
+
+ clearenv();
+ for (i=0; i < sizeof(stuff)/sizeof(char *); i++) putenv(stuff[i]);
+ *(argv++) = "-l";
+ xchdir(up->pw_dir);
+ } else unsetenv("IFS");
+ setenv("PATH", "/sbin:/bin:/usr/sbin:/usr/bin", 1);
+ if (!(toys.optflags & (FLAG_m|FLAG_p))) {
+ setenv("HOME", up->pw_dir, 1);
+ setenv("SHELL", up->pw_shell, 1);
+ setenv("USER", up->pw_name, 1);
+ setenv("LOGNAME", up->pw_name, 1);
+ } else unsetenv("IFS");
- passhash = crypt (toybuf, shp -> sp_pwdp);
- for (ii = 0; toybuf[ii]; ii++) toybuf[ii] = 0;
- if (!passhash) perror_exit ("can't crypt");
-
- if (strcmp (passhash, shp -> sp_pwdp) != 0) deny ();
-
- up = getpwnam (name);
- if (!up) perror_exit ("can't getpwnam");
-
- xsetuid (up -> pw_uid);
- xchdir (up -> pw_dir);
-
- argu = xmalloc (sizeof (char *)*(toys.optc + 4));
- argv = argu;
- argv[0] = toys.optflags & FLAG_s ? TT.s : up -> pw_shell;
- if (toys.optflags & FLAG_l) (argv++)[1] = "-l";
if (toys.optflags & FLAG_c) {
- argv[1] = "-c";
- argv[2] = TT.c;
- argv += 2;
+ *(argv++) = "-c";
+ *(argv++) = TT.c;
}
- memcpy (argv + 1, toys.optargs, sizeof (char *)*toys.optc);
- execve (argu[0], argu,
- toys.optflags & FLAG_l ? (char *[]){
- xmsprintf ( "HOME=%s", up -> pw_dir),
- xmsprintf ("SHELL=%s", up -> pw_shell),
- xmsprintf ( "USER=%s", up -> pw_name),
- xmsprintf ( "TERM=%s", getenv ("TERM")),
- 0
- } : environ);
- perror_exit ("can't exec %s", argu[0]);
+ while ((*(argv++) = *(toys.optargs++)));
+ xexec(argu);
+ perror_exit("can't exec %s", *argu);
+
+deny:
+ puts("No.");
+ toys.exitval = 1;
}