1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini id implementation for busybox
|
---|
4 | *
|
---|
5 | * Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
|
---|
6 | *
|
---|
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
8 | */
|
---|
9 |
|
---|
10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
|
---|
11 | /* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
|
---|
12 | * be more similar to GNU id.
|
---|
13 | */
|
---|
14 |
|
---|
15 | #include "busybox.h"
|
---|
16 | #include "pwd_.h"
|
---|
17 | #include <stdio.h>
|
---|
18 | #include <unistd.h>
|
---|
19 | #include <sys/types.h>
|
---|
20 |
|
---|
21 | #ifdef CONFIG_SELINUX
|
---|
22 | #include <selinux/selinux.h> /* for is_selinux_enabled() */
|
---|
23 | #endif
|
---|
24 |
|
---|
25 | #define PRINT_REAL 1
|
---|
26 | #define NAME_NOT_NUMBER 2
|
---|
27 | #define JUST_USER 4
|
---|
28 | #define JUST_GROUP 8
|
---|
29 |
|
---|
30 | static short printf_full(unsigned int id, const char *arg, const char prefix)
|
---|
31 | {
|
---|
32 | const char *fmt = "%cid=%u";
|
---|
33 | short status=EXIT_FAILURE;
|
---|
34 |
|
---|
35 | if(arg) {
|
---|
36 | fmt = "%cid=%u(%s)";
|
---|
37 | status=EXIT_SUCCESS;
|
---|
38 | }
|
---|
39 | bb_printf(fmt, prefix, id, arg);
|
---|
40 | return status;
|
---|
41 | }
|
---|
42 |
|
---|
43 | int id_main(int argc, char **argv)
|
---|
44 | {
|
---|
45 | struct passwd *p;
|
---|
46 | uid_t uid;
|
---|
47 | gid_t gid;
|
---|
48 | unsigned long flags;
|
---|
49 | short status;
|
---|
50 |
|
---|
51 | /* Don't allow -n -r -nr -ug -rug -nug -rnug */
|
---|
52 | /* Don't allow more than one username */
|
---|
53 | bb_opt_complementally = "?1:?:u--g:g--u:r?ug:n?ug";
|
---|
54 | flags = bb_getopt_ulflags(argc, argv, "rnug");
|
---|
55 |
|
---|
56 | /* This values could be overwritten later */
|
---|
57 | uid = geteuid();
|
---|
58 | gid = getegid();
|
---|
59 | if (flags & PRINT_REAL) {
|
---|
60 | uid = getuid();
|
---|
61 | gid = getgid();
|
---|
62 | }
|
---|
63 |
|
---|
64 | if(argv[optind]) {
|
---|
65 | p=getpwnam(argv[optind]);
|
---|
66 | /* bb_xgetpwnam is needed because it exits on failure */
|
---|
67 | uid = bb_xgetpwnam(argv[optind]);
|
---|
68 | gid = p->pw_gid;
|
---|
69 | /* in this case PRINT_REAL is the same */
|
---|
70 | }
|
---|
71 |
|
---|
72 | if(flags & (JUST_GROUP | JUST_USER)) {
|
---|
73 | /* JUST_GROUP and JUST_USER are mutually exclusive */
|
---|
74 | if(flags & NAME_NOT_NUMBER) {
|
---|
75 | /* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
|
---|
76 | puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
|
---|
77 | } else {
|
---|
78 | bb_printf("%u\n",(flags & JUST_USER) ? uid : gid);
|
---|
79 | }
|
---|
80 | /* exit */
|
---|
81 | bb_fflush_stdout_and_exit(EXIT_SUCCESS);
|
---|
82 | }
|
---|
83 |
|
---|
84 | /* Print full info like GNU id */
|
---|
85 | /* bb_getpwuid doesn't exit on failure here */
|
---|
86 | status=printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
|
---|
87 | putchar(' ');
|
---|
88 | /* bb_getgrgid doesn't exit on failure here */
|
---|
89 | status|=printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
|
---|
90 |
|
---|
91 | #ifdef CONFIG_SELINUX
|
---|
92 | if ( is_selinux_enabled() ) {
|
---|
93 | security_context_t mysid;
|
---|
94 | char context[80];
|
---|
95 | int len = sizeof(context);
|
---|
96 |
|
---|
97 | getcon(&mysid);
|
---|
98 | context[0] = '\0';
|
---|
99 | if (mysid) {
|
---|
100 | len = strlen(mysid)+1;
|
---|
101 | safe_strncpy(context, mysid, len);
|
---|
102 | freecon(mysid);
|
---|
103 | }else{
|
---|
104 | safe_strncpy(context, "unknown",8);
|
---|
105 | }
|
---|
106 | bb_printf(" context=%s", context);
|
---|
107 | }
|
---|
108 | #endif
|
---|
109 |
|
---|
110 | putchar('\n');
|
---|
111 | bb_fflush_stdout_and_exit(status);
|
---|
112 | }
|
---|