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 * -Z option support: by Yuichi Nakamura <ynakam@hitachisoft.jp> 14 */ 15 16#include "libbb.h" 17 18#define PRINT_REAL 1 19#define NAME_NOT_NUMBER 2 20#define JUST_USER 4 21#define JUST_GROUP 8 22#if ENABLE_SELINUX 23#define JUST_CONTEXT 16 24#endif 25 26static int printf_full(unsigned int id, const char *arg, const char prefix) 27{ 28 const char *fmt = "%cid=%u"; 29 int status = EXIT_FAILURE; 30 31 if (arg) { 32 fmt = "%cid=%u(%s)"; 33 status = EXIT_SUCCESS; 34 } 35 printf(fmt, prefix, id, arg); 36 return status; 37} 38 39int id_main(int argc, char **argv); 40int id_main(int argc, char **argv) 41{ 42 struct passwd *p; 43 uid_t uid; 44 gid_t gid; 45 unsigned long flags; 46 short status; 47#if ENABLE_SELINUX 48 security_context_t scontext; 49#endif 50 /* Don't allow -n -r -nr -ug -rug -nug -rnug */ 51 /* Don't allow more than one username */ 52 opt_complementary = "?1:u--g:g--u:r?ug:n?ug" USE_SELINUX(":u--Z:Z--u:g--Z:Z--g"); 53 flags = getopt32(argv, "rnug" USE_SELINUX("Z")); 54 55 /* This values could be overwritten later */ 56 uid = geteuid(); 57 gid = getegid(); 58 if (flags & PRINT_REAL) { 59 uid = getuid(); 60 gid = getgid(); 61 } 62 63 if (argv[optind]) { 64 p = getpwnam(argv[optind]); 65 /* xuname2uid is needed because it exits on failure */ 66 uid = xuname2uid(argv[optind]); 67 gid = p->pw_gid; 68 /* in this case PRINT_REAL is the same */ 69 } 70 71 if (flags & (JUST_GROUP | JUST_USER USE_SELINUX(| JUST_CONTEXT))) { 72 /* JUST_GROUP and JUST_USER are mutually exclusive */ 73 if (flags & NAME_NOT_NUMBER) { 74 /* bb_getXXXid(-1) exit on failure, puts cannot segfault */ 75 puts((flags & JUST_USER) ? bb_getpwuid(NULL, -1, uid) : bb_getgrgid(NULL, -1, gid)); 76 } else { 77 if (flags & JUST_USER) { 78 printf("%u\n", uid); 79 } 80 if (flags & JUST_GROUP) { 81 printf("%u\n", gid); 82 } 83 } 84 85#if ENABLE_SELINUX 86 if (flags & JUST_CONTEXT) { 87 selinux_or_die(); 88 if (argc - optind == 1) { 89 bb_error_msg_and_die("user name can't be passed with -Z"); 90 } 91 92 if (getcon(&scontext)) { 93 bb_error_msg_and_die("can't get process context"); 94 } 95 printf("%s\n", scontext); 96 } 97#endif 98 /* exit */ 99 fflush_stdout_and_exit(EXIT_SUCCESS); 100 } 101 102 /* Print full info like GNU id */ 103 /* bb_getpwuid(0) doesn't exit on failure (returns NULL) */ 104 status = printf_full(uid, bb_getpwuid(NULL, 0, uid), 'u'); 105 putchar(' '); 106 status |= printf_full(gid, bb_getgrgid(NULL, 0, gid), 'g'); 107 108#if ENABLE_SELINUX 109 if (is_selinux_enabled()) { 110 security_context_t mysid; 111 const char *context; 112 113 context = "unknown"; 114 getcon(&mysid); 115 if (mysid) { 116 context = alloca(strlen(mysid) + 1); 117 strcpy((char*)context, mysid); 118 freecon(mysid); 119 } 120 printf(" context=%s", context); 121 } 122#endif 123 124 putchar('\n'); 125 fflush_stdout_and_exit(status); 126} 127