99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/* su.c - switch user
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*
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* Copyright 2013 CE Strake <strake888@gmail.com>
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*
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* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/su.html
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* TODO: log su attempts
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USE_SU(NEWTOY(su, "lmpc:s:", TOYFLAG_BIN|TOYFLAG_ROOTONLY))
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config SU
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bool "su"
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default y
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depends on TOYBOX_SHADOW
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help
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usage: su [-lmp] [-c CMD] [-s SHELL] [USER [ARGS...]]
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Switch to user (or root) and run shell (with optional command line).
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-s shell to use
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-c command to pass to shell with -c
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-l login shell
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-(m|p) preserve environment
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*/
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#define FOR_su
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#include "toys.h"
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GLOBALS(
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char *s;
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char *c;
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)
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static char *snapshot_env(char *name)
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{
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char *s = getenv(name);
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if (s) return xmprintf("%s=%s", name, s);
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return 0;
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}
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void su_main()
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{
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char *name, *passhash = 0, **argu, **argv;
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struct passwd *up;
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struct spwd *shp;
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if (*toys.optargs && !strcmp("-", *toys.optargs)) {
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toys.optflags |= FLAG_l;
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toys.optargs++;
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}
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if (*toys.optargs) name = *(toys.optargs++);
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else name = "root";
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if (!(shp = getspnam(name))) perror_exit("no '%s'", name);
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if (getuid()) {
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if (*shp->sp_pwdp != '$') goto deny;
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if (read_password(toybuf, sizeof(toybuf), "Password: ")) goto deny;
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passhash = crypt(toybuf, shp->sp_pwdp);
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memset(toybuf, 0, sizeof(toybuf));
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if (!passhash || strcmp(passhash, shp->sp_pwdp)) goto deny;
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}
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up = xgetpwnam(name);
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xsetuser(up);
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argv = argu = xmalloc(sizeof(char *)*(toys.optc + 4));
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*(argv++) = TT.s ? TT.s : up->pw_shell;
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if (toys.optflags & FLAG_l) {
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int i;
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char *stuff[] = {snapshot_env("TERM"), snapshot_env("DISPLAY"),
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snapshot_env("COLORTERM"), snapshot_env("XAUTHORITY")};
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clearenv();
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for (i=0; i < ARRAY_LEN(stuff); i++) if (stuff[i]) putenv(stuff[i]);
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*(argv++) = "-l";
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xchdir(up->pw_dir);
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} else unsetenv("IFS");
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setenv("PATH", "/sbin:/bin:/usr/sbin:/usr/bin", 1);
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if (!(toys.optflags & (FLAG_m|FLAG_p))) {
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setenv("HOME", up->pw_dir, 1);
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setenv("SHELL", up->pw_shell, 1);
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setenv("USER", up->pw_name, 1);
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setenv("LOGNAME", up->pw_name, 1);
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} else unsetenv("IFS");
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if (toys.optflags & FLAG_c) {
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*(argv++) = "-c";
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*(argv++) = TT.c;
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}
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while ((*(argv++) = *(toys.optargs++)));
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xexec(argu);
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deny:
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puts("No.");
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toys.exitval = 1;
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}
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