/* vi: set sw=4 ts=4: */ /* * Mini id implementation for busybox * * Copyright (C) 2000 by Randolph Chung <tausq@debian.org> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ /* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */ /* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to * be more similar to GNU id. */ #include "busybox.h" #include "pwd_.h" #include <stdio.h> #include <unistd.h> #include <sys/types.h> #ifdef CONFIG_SELINUX #include <selinux/selinux.h> /* for is_selinux_enabled() */ #endif #define PRINT_REAL 1 #define NAME_NOT_NUMBER 2 #define JUST_USER 4 #define JUST_GROUP 8 static short printf_full(unsigned int id, const char *arg, const char prefix) { const char *fmt = "%cid=%u"; short status=EXIT_FAILURE; if(arg) { fmt = "%cid=%u(%s)"; status=EXIT_SUCCESS; } bb_printf(fmt, prefix, id, arg); return status; } int id_main(int argc, char **argv) { struct passwd *p; uid_t uid; gid_t gid; unsigned long flags; short status; /* Don't allow -n -r -nr -ug -rug -nug -rnug */ /* Don't allow more than one username */ bb_opt_complementally = "?1:?:u--g:g--u:r?ug:n?ug"; flags = bb_getopt_ulflags(argc, argv, "rnug"); /* This values could be overwritten later */ uid = geteuid(); gid = getegid(); if (flags & PRINT_REAL) { uid = getuid(); gid = getgid(); } if(argv[optind]) { p=getpwnam(argv[optind]); /* bb_xgetpwnam is needed because it exits on failure */ uid = bb_xgetpwnam(argv[optind]); gid = p->pw_gid; /* in this case PRINT_REAL is the same */ } if(flags & (JUST_GROUP | JUST_USER)) { /* JUST_GROUP and JUST_USER are mutually exclusive */ if(flags & NAME_NOT_NUMBER) { /* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */ puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 )); } else { bb_printf("%u\n",(flags & JUST_USER) ? uid : gid); } /* exit */ bb_fflush_stdout_and_exit(EXIT_SUCCESS); } /* Print full info like GNU id */ /* bb_getpwuid doesn't exit on failure here */ status=printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u'); putchar(' '); /* bb_getgrgid doesn't exit on failure here */ status|=printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g'); #ifdef CONFIG_SELINUX if ( is_selinux_enabled() ) { security_context_t mysid; char context[80]; int len = sizeof(context); getcon(&mysid); context[0] = '\0'; if (mysid) { len = strlen(mysid)+1; safe_strncpy(context, mysid, len); freecon(mysid); }else{ safe_strncpy(context, "unknown",8); } bb_printf(" context=%s", context); } #endif putchar('\n'); bb_fflush_stdout_and_exit(status); }