Annotation of /trunk/mkinitrd-magellan/busybox/loginutils/su.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (17 years 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 | niro | 532 | /* 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 | } |