id.c revision 162571 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1991, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)id.c	8.2 (Berkeley) 2/16/94";
43#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/usr.bin/id/id.c 162571 2006-09-23 12:30:31Z rwatson $");
47
48#include <sys/param.h>
49#include <sys/mac.h>
50
51#ifdef USE_BSM_AUDIT
52#include <bsm/audit.h>
53#endif
54
55#include <err.h>
56#include <errno.h>
57#include <grp.h>
58#include <pwd.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64void	id_print(struct passwd *, int, int, int);
65void	pline(struct passwd *);
66void	pretty(struct passwd *);
67void	auditid(void);
68void	group(struct passwd *, int);
69void	maclabel(void);
70void	usage(void);
71struct passwd *who(char *);
72
73int isgroups, iswhoami;
74
75int
76main(int argc, char *argv[])
77{
78	struct group *gr;
79	struct passwd *pw;
80	int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
81	int aflag;
82	const char *myname;
83
84	Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
85	aflag = 0;
86
87	myname = strrchr(argv[0], '/');
88	myname = (myname != NULL) ? myname + 1 : argv[0];
89	if (strcmp(myname, "groups") == 0) {
90		isgroups = 1;
91		Gflag = nflag = 1;
92	}
93	else if (strcmp(myname, "whoami") == 0) {
94		iswhoami = 1;
95		uflag = nflag = 1;
96	}
97
98	while ((ch = getopt(argc, argv,
99	    (isgroups || iswhoami) ? "" : "PGMagnpru")) != -1)
100		switch(ch) {
101		case 'G':
102			Gflag = 1;
103			break;
104		case 'M':
105			Mflag = 1;
106			break;
107		case 'P':
108			Pflag = 1;
109			break;
110		case 'a':
111			aflag = 1;
112			break;
113		case 'g':
114			gflag = 1;
115			break;
116		case 'n':
117			nflag = 1;
118			break;
119		case 'p':
120			pflag = 1;
121			break;
122		case 'r':
123			rflag = 1;
124			break;
125		case 'u':
126			uflag = 1;
127			break;
128		case '?':
129		default:
130			usage();
131		}
132	argc -= optind;
133	argv += optind;
134
135	if (iswhoami && argc > 0)
136		usage();
137
138	switch(Gflag + Mflag + Pflag + aflag + gflag + pflag + uflag) {
139	case 1:
140		break;
141	case 0:
142		if (!nflag && !rflag)
143			break;
144		/* FALLTHROUGH */
145	default:
146		usage();
147	}
148
149	pw = *argv ? who(*argv) : NULL;
150
151	if (Mflag && pw != NULL)
152		usage();
153
154#ifdef USE_BSM_AUDIT
155	if (aflag) {
156		auditid();
157		exit(0);
158	}
159#else
160	if (aflag)
161		usage();
162#endif
163
164	if (gflag) {
165		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
166		if (nflag && (gr = getgrgid(id)))
167			(void)printf("%s\n", gr->gr_name);
168		else
169			(void)printf("%u\n", id);
170		exit(0);
171	}
172
173	if (uflag) {
174		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
175		if (nflag && (pw = getpwuid(id)))
176			(void)printf("%s\n", pw->pw_name);
177		else
178			(void)printf("%u\n", id);
179		exit(0);
180	}
181
182	if (Gflag) {
183		group(pw, nflag);
184		exit(0);
185	}
186
187	if (Mflag) {
188		maclabel();
189		exit(0);
190	}
191
192	if (Pflag) {
193		pline(pw);
194		exit(0);
195	}
196
197	if (pflag) {
198		pretty(pw);
199		exit(0);
200	}
201
202	if (pw) {
203		id_print(pw, 1, 0, 0);
204	}
205	else {
206		id = getuid();
207		if ((pw = getpwuid(id)) != NULL)
208			id_print(pw, 0, 1, 1);
209	}
210	exit(0);
211}
212
213void
214pretty(struct passwd *pw)
215{
216	struct group *gr;
217	u_int eid, rid;
218	char *login;
219
220	if (pw) {
221		(void)printf("uid\t%s\n", pw->pw_name);
222		(void)printf("groups\t");
223		group(pw, 1);
224	} else {
225		if ((login = getlogin()) == NULL)
226			err(1, "getlogin");
227
228		pw = getpwuid(rid = getuid());
229		if (pw == NULL || strcmp(login, pw->pw_name))
230			(void)printf("login\t%s\n", login);
231		if (pw)
232			(void)printf("uid\t%s\n", pw->pw_name);
233		else
234			(void)printf("uid\t%u\n", rid);
235
236		if ((eid = geteuid()) != rid) {
237			if ((pw = getpwuid(eid)))
238				(void)printf("euid\t%s\n", pw->pw_name);
239			else
240				(void)printf("euid\t%u\n", eid);
241		}
242		if ((rid = getgid()) != (eid = getegid())) {
243			if ((gr = getgrgid(rid)))
244				(void)printf("rgid\t%s\n", gr->gr_name);
245			else
246				(void)printf("rgid\t%u\n", rid);
247		}
248		(void)printf("groups\t");
249		group(NULL, 1);
250	}
251}
252
253void
254id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
255{
256	struct group *gr;
257	gid_t gid, egid, lastgid;
258	uid_t uid, euid;
259	int cnt, ngroups;
260	gid_t groups[NGROUPS + 1];
261	const char *fmt;
262
263	uid = pw->pw_uid;
264	gid = pw->pw_gid;
265
266	if (use_ggl) {
267		ngroups = NGROUPS + 1;
268		getgrouplist(pw->pw_name, gid, groups, &ngroups);
269	}
270	else {
271		ngroups = getgroups(NGROUPS + 1, groups);
272	}
273
274	printf("uid=%u(%s)", uid, pw->pw_name);
275	printf(" gid=%u", gid);
276	if ((gr = getgrgid(gid)))
277		(void)printf("(%s)", gr->gr_name);
278	if (p_euid && (euid = geteuid()) != uid) {
279		(void)printf(" euid=%u", euid);
280		if ((pw = getpwuid(euid)))
281			(void)printf("(%s)", pw->pw_name);
282	}
283	if (p_egid && (egid = getegid()) != gid) {
284		(void)printf(" egid=%u", egid);
285		if ((gr = getgrgid(egid)))
286			(void)printf("(%s)", gr->gr_name);
287	}
288	fmt = " groups=%u";
289	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
290		if (lastgid == (gid = groups[cnt]))
291			continue;
292		printf(fmt, gid);
293		fmt = ", %u";
294		if ((gr = getgrgid(gid)))
295			printf("(%s)", gr->gr_name);
296		lastgid = gid;
297	}
298	printf("\n");
299}
300
301#ifdef USE_BSM_AUDIT
302void
303auditid(void)
304{
305	auditinfo_t auditinfo;
306
307	if (getaudit(&auditinfo) < 0)
308		err(-1, "getauditinfo");
309	printf("auid=%d\n", auditinfo.ai_auid);
310	printf("mask.success=0x%08x\n", auditinfo.ai_mask.am_success);
311	printf("mask.failure=0x%08x\n", auditinfo.ai_mask.am_failure);
312	printf("termid.port=0x%08x\n", auditinfo.ai_termid.port);
313	printf("asid=%d\n", auditinfo.ai_asid);
314}
315#endif
316
317void
318group(struct passwd *pw, int nflag)
319{
320	struct group *gr;
321	int cnt, id, lastid, ngroups;
322	gid_t groups[NGROUPS + 1];
323	const char *fmt;
324
325	if (pw) {
326		ngroups = NGROUPS + 1;
327		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
328	} else {
329		groups[0] = getgid();
330		ngroups = getgroups(NGROUPS, groups + 1) + 1;
331	}
332	fmt = nflag ? "%s" : "%u";
333	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
334		if (lastid == (id = groups[cnt]))
335			continue;
336		if (nflag) {
337			if ((gr = getgrgid(id)))
338				(void)printf(fmt, gr->gr_name);
339			else
340				(void)printf(*fmt == ' ' ? " %u" : "%u",
341				    id);
342			fmt = " %s";
343		} else {
344			(void)printf(fmt, id);
345			fmt = " %u";
346		}
347		lastid = id;
348	}
349	(void)printf("\n");
350}
351
352void
353maclabel(void)
354{
355	char *string;
356	mac_t label;
357	int error;
358
359	error = mac_prepare_process_label(&label);
360	if (error == -1)
361		errx(1, "mac_prepare_type: %s", strerror(errno));
362
363	error = mac_get_proc(label);
364	if (error == -1)
365		errx(1, "mac_get_proc: %s", strerror(errno));
366
367	error = mac_to_text(label, &string);
368	if (error == -1)
369		errx(1, "mac_to_text: %s", strerror(errno));
370
371	(void)printf("%s\n", string);
372	mac_free(label);
373	free(string);
374}
375
376struct passwd *
377who(char *u)
378{
379	struct passwd *pw;
380	long id;
381	char *ep;
382
383	/*
384	 * Translate user argument into a pw pointer.  First, try to
385	 * get it as specified.  If that fails, try it as a number.
386	 */
387	if ((pw = getpwnam(u)))
388		return(pw);
389	id = strtol(u, &ep, 10);
390	if (*u && !*ep && (pw = getpwuid(id)))
391		return(pw);
392	errx(1, "%s: no such user", u);
393	/* NOTREACHED */
394}
395
396void
397pline(struct passwd *pw)
398{
399
400	if (!pw) {
401		if ((pw = getpwuid(getuid())) == NULL)
402			err(1, "getpwuid");
403	}
404
405	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
406			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
407			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
408			pw->pw_dir, pw->pw_shell);
409}
410
411
412void
413usage(void)
414{
415
416	if (isgroups)
417		(void)fprintf(stderr, "usage: groups [user]\n");
418	else if (iswhoami)
419		(void)fprintf(stderr, "usage: whoami\n");
420	else
421		(void)fprintf(stderr, "%s\n%s\n%s\n%s%s\n%s\n%s\n%s\n",
422		    "usage: id [user]",
423		    "       id -G [-n] [user]",
424		    "       id -M",
425		    "       id -P [user]",
426#ifdef USE_BSM_AUDIT
427		    "       id -a\n",
428#else
429		    "",
430#endif
431		    "       id -g [-nr] [user]",
432		    "       id -p [user]",
433		    "       id -u [-nr] [user]");
434	exit(1);
435}
436