freebsd-dev/usr.bin/id/id.c
Stefan Farfeleder 311e80b148 Print the euid after the gid as demanded by POSIX.
Submitted by:	Martin Nagy <nagy.martin@gmail.com>
PR:		96239
MFC after:	2 weeks
2006-05-28 12:32:30 +00:00

395 lines
8.5 KiB
C

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