id.c revision 162578 
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 162578 2006-09-23 15:43:29Z 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) ? "" : "APGMgnpru")) != -1)
100		switch(ch) {
101#ifdef USE_BSM_AUDIT
102		case 'A':
103			Aflag = 1;
104			break;
105#endif
106		case 'G':
107			Gflag = 1;
108			break;
109		case 'M':
110			Mflag = 1;
111			break;
112		case 'P':
113			Pflag = 1;
114			break;
115		case 'g':
116			gflag = 1;
117			break;
118		case 'n':
119			nflag = 1;
120			break;
121		case 'p':
122			pflag = 1;
123			break;
124		case 'r':
125			rflag = 1;
126			break;
127		case 'u':
128			uflag = 1;
129			break;
130		case '?':
131		default:
132			usage();
133		}
134	argc -= optind;
135	argv += optind;
136
137	if (iswhoami && argc > 0)
138		usage();
139
140	switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
141	case 1:
142		break;
143	case 0:
144		if (!nflag && !rflag)
145			break;
146		/* FALLTHROUGH */
147	default:
148		usage();
149	}
150
151	pw = *argv ? who(*argv) : NULL;
152
153	if (Mflag && pw != NULL)
154		usage();
155
156#ifdef USE_BSM_AUDIT
157	if (Aflag) {
158		auditid();
159		exit(0);
160	}
161#endif
162
163	if (gflag) {
164		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
165		if (nflag && (gr = getgrgid(id)))
166			(void)printf("%s\n", gr->gr_name);
167		else
168			(void)printf("%u\n", id);
169		exit(0);
170	}
171
172	if (uflag) {
173		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
174		if (nflag && (pw = getpwuid(id)))
175			(void)printf("%s\n", pw->pw_name);
176		else
177			(void)printf("%u\n", id);
178		exit(0);
179	}
180
181	if (Gflag) {
182		group(pw, nflag);
183		exit(0);
184	}
185
186	if (Mflag) {
187		maclabel();
188		exit(0);
189	}
190
191	if (Pflag) {
192		pline(pw);
193		exit(0);
194	}
195
196	if (pflag) {
197		pretty(pw);
198		exit(0);
199	}
200
201	if (pw) {
202		id_print(pw, 1, 0, 0);
203	}
204	else {
205		id = getuid();
206		if ((pw = getpwuid(id)) != NULL)
207			id_print(pw, 0, 1, 1);
208	}
209	exit(0);
210}
211
212void
213pretty(struct passwd *pw)
214{
215	struct group *gr;
216	u_int eid, rid;
217	char *login;
218
219	if (pw) {
220		(void)printf("uid\t%s\n", pw->pw_name);
221		(void)printf("groups\t");
222		group(pw, 1);
223	} else {
224		if ((login = getlogin()) == NULL)
225			err(1, "getlogin");
226
227		pw = getpwuid(rid = getuid());
228		if (pw == NULL || strcmp(login, pw->pw_name))
229			(void)printf("login\t%s\n", login);
230		if (pw)
231			(void)printf("uid\t%s\n", pw->pw_name);
232		else
233			(void)printf("uid\t%u\n", rid);
234
235		if ((eid = geteuid()) != rid) {
236			if ((pw = getpwuid(eid)))
237				(void)printf("euid\t%s\n", pw->pw_name);
238			else
239				(void)printf("euid\t%u\n", eid);
240		}
241		if ((rid = getgid()) != (eid = getegid())) {
242			if ((gr = getgrgid(rid)))
243				(void)printf("rgid\t%s\n", gr->gr_name);
244			else
245				(void)printf("rgid\t%u\n", rid);
246		}
247		(void)printf("groups\t");
248		group(NULL, 1);
249	}
250}
251
252void
253id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
254{
255	struct group *gr;
256	gid_t gid, egid, lastgid;
257	uid_t uid, euid;
258	int cnt, ngroups;
259	gid_t groups[NGROUPS + 1];
260	const char *fmt;
261
262	uid = pw->pw_uid;
263	gid = pw->pw_gid;
264
265	if (use_ggl) {
266		ngroups = NGROUPS + 1;
267		getgrouplist(pw->pw_name, gid, groups, &ngroups);
268	}
269	else {
270		ngroups = getgroups(NGROUPS + 1, groups);
271	}
272
273	printf("uid=%u(%s)", uid, pw->pw_name);
274	printf(" gid=%u", gid);
275	if ((gr = getgrgid(gid)))
276		(void)printf("(%s)", gr->gr_name);
277	if (p_euid && (euid = geteuid()) != uid) {
278		(void)printf(" euid=%u", euid);
279		if ((pw = getpwuid(euid)))
280			(void)printf("(%s)", pw->pw_name);
281	}
282	if (p_egid && (egid = getegid()) != gid) {
283		(void)printf(" egid=%u", egid);
284		if ((gr = getgrgid(egid)))
285			(void)printf("(%s)", gr->gr_name);
286	}
287	fmt = " groups=%u";
288	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
289		if (lastgid == (gid = groups[cnt]))
290			continue;
291		printf(fmt, gid);
292		fmt = ", %u";
293		if ((gr = getgrgid(gid)))
294			printf("(%s)", gr->gr_name);
295		lastgid = gid;
296	}
297	printf("\n");
298}
299
300#ifdef USE_BSM_AUDIT
301void
302auditid(void)
303{
304	auditinfo_t auditinfo;
305
306	if (getaudit(&auditinfo) < 0)
307		err(-1, "getauditinfo");
308	printf("auid=%d\n", auditinfo.ai_auid);
309	printf("mask.success=0x%08x\n", auditinfo.ai_mask.am_success);
310	printf("mask.failure=0x%08x\n", auditinfo.ai_mask.am_failure);
311	printf("termid.port=0x%08x\n", auditinfo.ai_termid.port);
312	printf("asid=%d\n", auditinfo.ai_asid);
313}
314#endif
315
316void
317group(struct passwd *pw, int nflag)
318{
319	struct group *gr;
320	int cnt, id, lastid, ngroups;
321	gid_t groups[NGROUPS + 1];
322	const char *fmt;
323
324	if (pw) {
325		ngroups = NGROUPS + 1;
326		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
327	} else {
328		groups[0] = getgid();
329		ngroups = getgroups(NGROUPS, groups + 1) + 1;
330	}
331	fmt = nflag ? "%s" : "%u";
332	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
333		if (lastid == (id = groups[cnt]))
334			continue;
335		if (nflag) {
336			if ((gr = getgrgid(id)))
337				(void)printf(fmt, gr->gr_name);
338			else
339				(void)printf(*fmt == ' ' ? " %u" : "%u",
340				    id);
341			fmt = " %s";
342		} else {
343			(void)printf(fmt, id);
344			fmt = " %u";
345		}
346		lastid = id;
347	}
348	(void)printf("\n");
349}
350
351void
352maclabel(void)
353{
354	char *string;
355	mac_t label;
356	int error;
357
358	error = mac_prepare_process_label(&label);
359	if (error == -1)
360		errx(1, "mac_prepare_type: %s", strerror(errno));
361
362	error = mac_get_proc(label);
363	if (error == -1)
364		errx(1, "mac_get_proc: %s", strerror(errno));
365
366	error = mac_to_text(label, &string);
367	if (error == -1)
368		errx(1, "mac_to_text: %s", strerror(errno));
369
370	(void)printf("%s\n", string);
371	mac_free(label);
372	free(string);
373}
374
375struct passwd *
376who(char *u)
377{
378	struct passwd *pw;
379	long id;
380	char *ep;
381
382	/*
383	 * Translate user argument into a pw pointer.  First, try to
384	 * get it as specified.  If that fails, try it as a number.
385	 */
386	if ((pw = getpwnam(u)))
387		return(pw);
388	id = strtol(u, &ep, 10);
389	if (*u && !*ep && (pw = getpwuid(id)))
390		return(pw);
391	errx(1, "%s: no such user", u);
392	/* NOTREACHED */
393}
394
395void
396pline(struct passwd *pw)
397{
398
399	if (!pw) {
400		if ((pw = getpwuid(getuid())) == NULL)
401			err(1, "getpwuid");
402	}
403
404	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
405			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
406			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
407			pw->pw_dir, pw->pw_shell);
408}
409
410
411void
412usage(void)
413{
414
415	if (isgroups)
416		(void)fprintf(stderr, "usage: groups [user]\n");
417	else if (iswhoami)
418		(void)fprintf(stderr, "usage: whoami\n");
419	else
420		(void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n",
421		    "usage: id [user]",
422#ifdef USE_BSM_AUDIT
423		    "       id -A\n",
424#else
425		    "",
426#endif
427		    "       id -G [-n] [user]",
428		    "       id -M",
429		    "       id -P [user]",
430		    "       id -g [-nr] [user]",
431		    "       id -p [user]",
432		    "       id -u [-nr] [user]");
433	exit(1);
434}
435