Mercurial > hg > toybox

annotate toys/pending/sulogin.c @ 1564:685a0da6ca59 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
probe for getspnam(), forkpty(), utmpx, replace sethostname() Android is missing all of these; we need to probe for some so we have a config symbol to depend on. sethostname() is easily replaced. We got termios.h via pty.h; now it's not included in configure-step tools, so we need termios.h to generate globals.
author Isaac Dunham <ibid.ag@gmail.com>
date Wed, 19 Nov 2014 16:38:46 -0600
parents 5d64dc59e569
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1312
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
1 /* sulogin.c - Single User Login.
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
2 *
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
3 * Copyright 2014 Ashish Kumar Gupta <ashishkguptaiit.cse@gmail.com>
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
4 * Copyright 2014 Kyungwan Han <asura321@gmail.com>
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
5 *
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
6 *
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
7 * Relies on libcrypt for hash calculation.
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
8 * No support for PAM/securetty/selinux/login script/issue/utmp
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
9
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
10
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
11 USE_SULOGIN(NEWTOY(sulogin, "t#<0=0", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
12
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
13 config SULOGIN
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
14 bool "sulogin"
1313
5d64dc59e569 Pending commands should default n
Rob Landley <rob@landley.net>
parents: 1312
diff changeset
15 default n
1564
685a0da6ca59 probe for getspnam(), forkpty(), utmpx, replace sethostname()
Isaac Dunham <ibid.ag@gmail.com>
parents: 1313
diff changeset
16 depends on TOYBOX_SHADOW
1312
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
17 help
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
18 usage: sulogin [-t time] [tty]
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
19
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
20 Single User Login.
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
21 -t Default Time for Single User Login
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
22 */
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
23 #define FOR_sulogin
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
24 #include "toys.h"
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
25
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
26 GLOBALS(
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
27 long timeout;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
28 struct termios crntio;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
29 )
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
30
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
31 static void timeout_handle(int signo)
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
32 {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
33 tcsetattr(0, TCSANOW, &(TT.crntio));
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
34 fflush(stdout);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
35 xprintf("\n Timed out - Normal startup\n");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
36 exit(0);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
37 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
38
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
39 static int validate_password(char *pwd)
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
40 {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
41 struct sigaction sa;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
42 int ret;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
43 char *s = "Give root password for system maintenance\n"
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
44 "(or type Control-D for normal startup):",
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
45 *pass;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
46
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
47 tcgetattr(0, &(TT.crntio));
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
48 sa.sa_handler = timeout_handle;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
49
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
50 if(TT.timeout) {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
51 sigaction(SIGALRM, &sa, NULL);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
52 alarm(TT.timeout);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
53 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
54
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
55 ret = read_password(toybuf, sizeof(toybuf), s);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
56 if(TT.timeout) alarm(0);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
57
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
58 if ( ret && !toybuf[0]) {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
59 xprintf("Normal startup.\n");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
60 return -1;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
61 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
62
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
63 pass = crypt(toybuf, pwd);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
64 ret = 1;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
65 if( pass && !strcmp(pass, pwd)) ret = 0;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
66
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
67 return ret;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
68 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
69
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
70 static void run_shell(char *shell)
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
71 {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
72 snprintf(toybuf,sizeof(toybuf), "-%s", shell);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
73 execl(shell, toybuf, NULL);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
74 error_exit("Failed to spawn shell");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
75 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
76
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
77 void sulogin_main(void)
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
78 {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
79 struct passwd *pwd = NULL;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
80 struct spwd * spwd = NULL;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
81 char *forbid[] = {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
82 "BASH_ENV", "ENV", "HOME", "IFS", "LD_LIBRARY_PATH", "LD_PRELOAD",
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
83 "LD_TRACE_LOADED_OBJECTS", "LD_BIND_NOW", "LD_AOUT_LIBRARY_PATH",
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
84 "LD_AOUT_PRELOAD", "LD_NOWARN", "LD_KEEPDIR", "SHELL", NULL
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
85 };
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
86 char *shell = NULL, *pass = NULL, **temp = forbid;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
87
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
88 if (toys.optargs[0]) {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
89 int fd;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
90
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
91 dup2((fd = xopen(toys.optargs[0], O_RDWR)), 0);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
92 if (!isatty(0)) error_exit("%s: it is not a tty", toys.optargs[0]);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
93 dup2( fd, 1);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
94 dup2( fd, 2);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
95 if (fd > 2) close(fd);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
96 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
97
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
98 for (temp = forbid; *temp; temp++) unsetenv(*temp);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
99
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
100 if (!(pwd = getpwuid(0))) error_exit("invalid user");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
101 pass = pwd->pw_passwd;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
102
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
103 if ((pass[0] == 'x' || pass[0] == '*') && !pass[1]) {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
104 if ((spwd = getspnam (pwd->pw_name))) pass = spwd->sp_pwdp;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
105 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
106
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
107 while (1) {
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
108 int r = validate_password(pass);
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
109
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
110 if (r == 1) xprintf("Incorrect Login.\n");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
111 else if (r == 0) break;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
112 else if (r == -1) return;
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
113 }
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
114
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
115 if ((shell = getenv("SUSHELL")) || (shell = getenv("sushell"))
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
116 || (shell = pwd->pw_shell))
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
117 run_shell((shell && *shell)? shell: "/bin/sh");
ff3ecf9e5095 Single-user login.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
118 }