54404cfb13
system callers of getgroups(), getgrouplist(), and setgroups() to
allocate buffers dynamically. Specifically, allocate a buffer of size
sysconf(_SC_NGROUPS_MAX)+1 (+2 in a few cases to allow for overflow).
This (or similar gymnastics) is required for the code to actually follow
the POSIX.1-2008 specification where {NGROUPS_MAX} may differ at runtime
and where getgroups may return {NGROUPS_MAX}+1 results on systems like
FreeBSD which include the primary group.
In id(1), don't pointlessly add the primary group to the list of all
groups, it is always the first result from getgroups(). In principle
the old code was more portable, but this was only done in one of the two
places where getgroups() was called to the overall effect was pointless.
Document the actual POSIX requirements in the getgroups(2) and
setgroups(2) manpages. We do not yet support a dynamic NGROUPS, but we
may in the future.
MFC after: 2 weeks
489 lines
10 KiB
C
489 lines
10 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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#ifdef USE_BSM_AUDIT
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#include <bsm/audit.h>
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#endif
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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, int);
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void pline(struct passwd *);
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void pretty(struct passwd *);
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void auditid(void);
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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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int Aflag;
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const char *myname;
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Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
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Aflag = 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) ? "" : "APGMagnpru")) != -1)
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switch(ch) {
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#ifdef USE_BSM_AUDIT
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case 'A':
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Aflag = 1;
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break;
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#endif
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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 'a':
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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(Aflag + Gflag + Mflag + 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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#ifdef USE_BSM_AUDIT
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if (Aflag) {
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auditid();
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exit(0);
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}
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#endif
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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, 1, 0, 0);
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}
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else {
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id = getuid();
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pw = getpwuid(id);
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id_print(pw, 0, 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 use_ggl, 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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long ngroups_max;
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gid_t *groups;
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const char *fmt;
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if (pw != NULL) {
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uid = pw->pw_uid;
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gid = pw->pw_gid;
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}
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else {
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uid = getuid();
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gid = getgid();
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}
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ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
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if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
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err(1, "malloc");
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if (use_ggl && pw != NULL) {
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ngroups = ngroups_max;
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getgrouplist(pw->pw_name, gid, groups, &ngroups);
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}
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else {
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ngroups = getgroups(ngroups_max, groups);
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}
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if (pw != NULL)
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printf("uid=%u(%s)", uid, pw->pw_name);
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else
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printf("uid=%u", getuid());
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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_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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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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free(groups);
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}
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#ifdef USE_BSM_AUDIT
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void
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auditid(void)
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{
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auditinfo_t auditinfo;
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auditinfo_addr_t ainfo_addr;
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int ret, extended;
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extended = 0;
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ret = getaudit(&auditinfo);
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if (ret < 0 && errno == E2BIG) {
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if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
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err(1, "getaudit_addr");
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extended = 1;
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} else if (ret < 0)
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err(1, "getaudit");
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if (extended != 0) {
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(void) printf("auid=%d\n"
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"mask.success=0x%08x\n"
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"mask.failure=0x%08x\n"
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"asid=%d\n"
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"termid_addr.port=0x%08x\n"
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"termid_addr.addr[0]=0x%08x\n"
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"termid_addr.addr[1]=0x%08x\n"
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"termid_addr.addr[2]=0x%08x\n"
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"termid_addr.addr[3]=0x%08x\n",
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ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
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ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
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ainfo_addr.ai_termid.at_port,
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ainfo_addr.ai_termid.at_addr[0],
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ainfo_addr.ai_termid.at_addr[1],
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ainfo_addr.ai_termid.at_addr[2],
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ainfo_addr.ai_termid.at_addr[3]);
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} else {
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(void) printf("auid=%d\n"
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"mask.success=0x%08x\n"
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"mask.failure=0x%08x\n"
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"asid=%d\n"
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"termid.port=0x%08x\n"
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"termid.machine=0x%08x\n",
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auditinfo.ai_auid, auditinfo.ai_mask.am_success,
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auditinfo.ai_mask.am_failure,
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auditinfo.ai_asid, auditinfo.ai_termid.port,
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auditinfo.ai_termid.machine);
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}
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}
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#endif
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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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long ngroups_max;
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gid_t *groups;
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const char *fmt;
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ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
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if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
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err(1, "malloc");
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if (pw) {
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ngroups = ngroups_max;
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(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
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} else {
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ngroups = getgroups(ngroups_max, groups);
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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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free(groups);
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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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|
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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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|
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void
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usage(void)
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{
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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%s\n%s\n%s\n%s\n%s\n%s\n",
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"usage: id [user]",
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#ifdef USE_BSM_AUDIT
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" id -A\n",
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|
#else
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"",
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|
#endif
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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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