Contents of /trunk/mkinitrd-magellan/busybox/loginutils/su.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 2693 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini su implementation for busybox |
4 | * |
5 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
6 | */ |
7 | |
8 | #include "busybox.h" |
9 | #include <syslog.h> |
10 | |
11 | #define SU_OPT_mp (3) |
12 | #define SU_OPT_l (4) |
13 | |
14 | int su_main(int argc, char **argv) |
15 | { |
16 | unsigned flags; |
17 | char *opt_shell = 0; |
18 | char *opt_command = 0; |
19 | char *opt_username = "root"; |
20 | struct passwd *pw; |
21 | uid_t cur_uid = getuid(); |
22 | const char *tty; |
23 | char *old_user; |
24 | |
25 | flags = getopt32(argc, argv, "mplc:s:", &opt_command, &opt_shell); |
26 | argc -= optind; |
27 | argv += optind; |
28 | |
29 | if (argc && LONE_DASH(argv[0])) { |
30 | flags |= SU_OPT_l; |
31 | argc--; |
32 | argv++; |
33 | } |
34 | |
35 | /* get user if specified */ |
36 | if (argc) { |
37 | opt_username = argv[0]; |
38 | // argc--; |
39 | argv++; |
40 | } |
41 | |
42 | if (ENABLE_FEATURE_SU_SYSLOG) { |
43 | /* The utmp entry (via getlogin) is probably the best way to identify |
44 | the user, especially if someone su's from a su-shell. |
45 | But getlogin can fail -- usually due to lack of utmp entry. |
46 | in this case resort to getpwuid. */ |
47 | old_user = xstrdup(USE_FEATURE_UTMP(getlogin() ? : ) (pw = getpwuid(cur_uid)) ? pw->pw_name : ""); |
48 | tty = ttyname(2) ? : "none"; |
49 | openlog(applet_name, 0, LOG_AUTH); |
50 | } |
51 | |
52 | pw = getpwnam(opt_username); |
53 | if (!pw) |
54 | bb_error_msg_and_die("unknown id: %s", opt_username); |
55 | |
56 | /* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER |
57 | is a username that is retrieved via NIS (YP), but that doesn't have |
58 | a default shell listed. */ |
59 | if (!pw->pw_shell || !pw->pw_shell[0]) |
60 | pw->pw_shell = (char *)DEFAULT_SHELL; |
61 | |
62 | if ((cur_uid == 0) || correct_password(pw)) { |
63 | if (ENABLE_FEATURE_SU_SYSLOG) |
64 | syslog(LOG_NOTICE, "%c %s %s:%s", |
65 | '+', tty, old_user, opt_username); |
66 | } else { |
67 | if (ENABLE_FEATURE_SU_SYSLOG) |
68 | syslog(LOG_NOTICE, "%c %s %s:%s", |
69 | '-', tty, old_user, opt_username); |
70 | bb_error_msg_and_die("incorrect password"); |
71 | } |
72 | |
73 | if (ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_SU_SYSLOG) { |
74 | closelog(); |
75 | free(old_user); |
76 | } |
77 | |
78 | if (!opt_shell && (flags & SU_OPT_mp)) |
79 | opt_shell = getenv("SHELL"); |
80 | |
81 | #if ENABLE_FEATURE_SU_CHECKS_SHELLS |
82 | if (opt_shell && cur_uid && restricted_shell(pw->pw_shell)) { |
83 | /* The user being su'd to has a nonstandard shell, and so is |
84 | probably a uucp account or has restricted access. Don't |
85 | compromise the account by allowing access with a standard |
86 | shell. */ |
87 | bb_error_msg("using restricted shell"); |
88 | opt_shell = 0; |
89 | } |
90 | #endif |
91 | if (!opt_shell) |
92 | opt_shell = pw->pw_shell; |
93 | |
94 | change_identity(pw); |
95 | setup_environment(opt_shell, flags & SU_OPT_l, !(flags & SU_OPT_mp), pw); |
96 | USE_SELINUX(set_current_security_context(NULL);) |
97 | |
98 | /* Never returns */ |
99 | run_shell(opt_shell, flags & SU_OPT_l, opt_command, (const char**)argv); |
100 | |
101 | return EXIT_FAILURE; |
102 | } |