68b9b81e79
Showing the ids of both an user given by an argument to `id', and the current user, is now handled in a single function. Displaying the current user's ids was inaccurate because getgroups(2) had been used. getgroups(2) returns the current kernel state of a user's groups, which may not always be correct if /etc/group was recently changed. - Fix a few style bugs. PR: bin/78085
390 lines
8.4 KiB
C
390 lines
8.4 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)id.c 8.2 (Berkeley) 2/16/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mac.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void id_print(struct passwd *, int, int);
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void pline(struct passwd *);
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void pretty(struct passwd *);
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void group(struct passwd *, int);
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void maclabel(void);
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void usage(void);
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struct passwd *who(char *);
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int isgroups, iswhoami;
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int
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main(int argc, char *argv[])
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{
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struct group *gr;
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struct passwd *pw;
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int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
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const char *myname;
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Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
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myname = strrchr(argv[0], '/');
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myname = (myname != NULL) ? myname + 1 : argv[0];
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if (strcmp(myname, "groups") == 0) {
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isgroups = 1;
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Gflag = nflag = 1;
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}
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else if (strcmp(myname, "whoami") == 0) {
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iswhoami = 1;
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uflag = nflag = 1;
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}
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while ((ch = getopt(argc, argv,
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(isgroups || iswhoami) ? "" : "PGMgnpru")) != -1)
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switch(ch) {
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case 'G':
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Gflag = 1;
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break;
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case 'M':
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Mflag = 1;
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break;
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case 'P':
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Pflag = 1;
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break;
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case 'g':
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gflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'p':
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pflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'u':
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uflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (iswhoami && argc > 0)
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usage();
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switch(Gflag + Pflag + gflag + pflag + uflag) {
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case 1:
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break;
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case 0:
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if (!nflag && !rflag)
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break;
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/* FALLTHROUGH */
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default:
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usage();
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}
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pw = *argv ? who(*argv) : NULL;
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if (Mflag && pw != NULL)
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usage();
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if (gflag) {
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id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
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if (nflag && (gr = getgrgid(id)))
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(void)printf("%s\n", gr->gr_name);
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else
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(void)printf("%u\n", id);
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exit(0);
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}
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if (uflag) {
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id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
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if (nflag && (pw = getpwuid(id)))
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(void)printf("%s\n", pw->pw_name);
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else
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(void)printf("%u\n", id);
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exit(0);
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}
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if (Gflag) {
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group(pw, nflag);
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exit(0);
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}
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if (Mflag) {
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maclabel();
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exit(0);
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}
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if (Pflag) {
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pline(pw);
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exit(0);
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}
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if (pflag) {
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pretty(pw);
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exit(0);
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}
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if (pw) {
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id_print(pw, 0, 0);
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}
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else {
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id = getuid();
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if ((pw = getpwuid(id)) != NULL)
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id_print(pw, 1, 1);
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}
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exit(0);
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}
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void
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pretty(struct passwd *pw)
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{
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struct group *gr;
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u_int eid, rid;
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char *login;
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if (pw) {
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(void)printf("uid\t%s\n", pw->pw_name);
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(void)printf("groups\t");
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group(pw, 1);
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} else {
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if ((login = getlogin()) == NULL)
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err(1, "getlogin");
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pw = getpwuid(rid = getuid());
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if (pw == NULL || strcmp(login, pw->pw_name))
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(void)printf("login\t%s\n", login);
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if (pw)
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(void)printf("uid\t%s\n", pw->pw_name);
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else
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(void)printf("uid\t%u\n", rid);
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if ((eid = geteuid()) != rid) {
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if ((pw = getpwuid(eid)))
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(void)printf("euid\t%s\n", pw->pw_name);
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else
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(void)printf("euid\t%u\n", eid);
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}
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if ((rid = getgid()) != (eid = getegid())) {
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if ((gr = getgrgid(rid)))
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(void)printf("rgid\t%s\n", gr->gr_name);
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else
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(void)printf("rgid\t%u\n", rid);
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}
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(void)printf("groups\t");
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group(NULL, 1);
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}
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}
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void
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id_print(struct passwd *pw, int p_euid, int p_egid)
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{
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struct group *gr;
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gid_t gid, egid, lastgid;
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uid_t uid, euid;
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int cnt, ngroups;
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gid_t groups[NGROUPS + 1];
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const char *fmt;
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uid = pw->pw_uid;
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gid = pw->pw_gid;
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ngroups = NGROUPS;
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getgrouplist(pw->pw_name, gid, groups, &ngroups);
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printf("uid=%u(%s)", uid, pw->pw_name);
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if (p_euid && (euid = geteuid()) != uid) {
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(void)printf(" euid=%u", euid);
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if ((pw = getpwuid(euid)))
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(void)printf("(%s)", pw->pw_name);
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}
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printf(" gid=%u", gid);
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if ((gr = getgrgid(gid)))
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(void)printf("(%s)", gr->gr_name);
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if (p_egid && (egid = getegid()) != gid) {
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(void)printf(" egid=%u", egid);
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if ((gr = getgrgid(egid)))
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(void)printf("(%s)", gr->gr_name);
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}
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fmt = " groups=%u";
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for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
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if (lastgid == (gid = groups[cnt]))
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continue;
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printf(fmt, gid);
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fmt = ", %u";
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if ((gr = getgrgid(gid)))
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printf("(%s)", gr->gr_name);
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lastgid = gid;
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}
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printf("\n");
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}
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void
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group(struct passwd *pw, int nflag)
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{
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struct group *gr;
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int cnt, id, lastid, ngroups;
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gid_t groups[NGROUPS + 1];
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const char *fmt;
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if (pw) {
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ngroups = NGROUPS + 1;
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(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
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} else {
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groups[0] = getgid();
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ngroups = getgroups(NGROUPS, groups + 1) + 1;
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}
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fmt = nflag ? "%s" : "%u";
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for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
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if (lastid == (id = groups[cnt]))
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continue;
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if (nflag) {
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if ((gr = getgrgid(id)))
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(void)printf(fmt, gr->gr_name);
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else
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(void)printf(*fmt == ' ' ? " %u" : "%u",
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id);
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fmt = " %s";
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} else {
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(void)printf(fmt, id);
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fmt = " %u";
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}
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lastid = id;
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}
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(void)printf("\n");
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}
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void
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maclabel(void)
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{
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char *string;
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mac_t label;
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int error;
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error = mac_prepare_process_label(&label);
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if (error == -1)
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errx(1, "mac_prepare_type: %s", strerror(errno));
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error = mac_get_proc(label);
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if (error == -1)
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errx(1, "mac_get_proc: %s", strerror(errno));
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error = mac_to_text(label, &string);
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if (error == -1)
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errx(1, "mac_to_text: %s", strerror(errno));
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(void)printf("%s\n", string);
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mac_free(label);
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free(string);
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}
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struct passwd *
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who(char *u)
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{
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struct passwd *pw;
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long id;
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char *ep;
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/*
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* Translate user argument into a pw pointer. First, try to
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* get it as specified. If that fails, try it as a number.
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*/
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if ((pw = getpwnam(u)))
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return(pw);
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id = strtol(u, &ep, 10);
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if (*u && !*ep && (pw = getpwuid(id)))
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return(pw);
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errx(1, "%s: no such user", u);
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/* NOTREACHED */
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}
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void
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pline(struct passwd *pw)
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{
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if (!pw) {
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if ((pw = getpwuid(getuid())) == NULL)
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err(1, "getpwuid");
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}
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(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
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pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
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(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
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pw->pw_dir, pw->pw_shell);
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}
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void
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usage(void)
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{
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if (isgroups)
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(void)fprintf(stderr, "usage: groups [user]\n");
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else if (iswhoami)
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(void)fprintf(stderr, "usage: whoami\n");
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else
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(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
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"usage: id [user]",
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" id -G [-n] [user]",
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" id -M",
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" id -P [user]",
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" id -g [-nr] [user]",
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" id -p [user]",
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" id -u [-nr] [user]");
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exit(1);
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}
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