id.c revision 194494 
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 194494 2009-06-19 15:58:24Z brooks $");
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) ? "" : "APGMagnpru")) != -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 'a':
116			break;
117		case 'g':
118			gflag = 1;
119			break;
120		case 'n':
121			nflag = 1;
122			break;
123		case 'p':
124			pflag = 1;
125			break;
126		case 'r':
127			rflag = 1;
128			break;
129		case 'u':
130			uflag = 1;
131			break;
132		case '?':
133		default:
134			usage();
135		}
136	argc -= optind;
137	argv += optind;
138
139	if (iswhoami && argc > 0)
140		usage();
141
142	switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
143	case 1:
144		break;
145	case 0:
146		if (!nflag && !rflag)
147			break;
148		/* FALLTHROUGH */
149	default:
150		usage();
151	}
152
153	pw = *argv ? who(*argv) : NULL;
154
155	if (Mflag && pw != NULL)
156		usage();
157
158#ifdef USE_BSM_AUDIT
159	if (Aflag) {
160		auditid();
161		exit(0);
162	}
163#endif
164
165	if (gflag) {
166		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
167		if (nflag && (gr = getgrgid(id)))
168			(void)printf("%s\n", gr->gr_name);
169		else
170			(void)printf("%u\n", id);
171		exit(0);
172	}
173
174	if (uflag) {
175		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
176		if (nflag && (pw = getpwuid(id)))
177			(void)printf("%s\n", pw->pw_name);
178		else
179			(void)printf("%u\n", id);
180		exit(0);
181	}
182
183	if (Gflag) {
184		group(pw, nflag);
185		exit(0);
186	}
187
188	if (Mflag) {
189		maclabel();
190		exit(0);
191	}
192
193	if (Pflag) {
194		pline(pw);
195		exit(0);
196	}
197
198	if (pflag) {
199		pretty(pw);
200		exit(0);
201	}
202
203	if (pw) {
204		id_print(pw, 1, 0, 0);
205	}
206	else {
207		id = getuid();
208		pw = getpwuid(id);
209		id_print(pw, 0, 1, 1);
210	}
211	exit(0);
212}
213
214void
215pretty(struct passwd *pw)
216{
217	struct group *gr;
218	u_int eid, rid;
219	char *login;
220
221	if (pw) {
222		(void)printf("uid\t%s\n", pw->pw_name);
223		(void)printf("groups\t");
224		group(pw, 1);
225	} else {
226		if ((login = getlogin()) == NULL)
227			err(1, "getlogin");
228
229		pw = getpwuid(rid = getuid());
230		if (pw == NULL || strcmp(login, pw->pw_name))
231			(void)printf("login\t%s\n", login);
232		if (pw)
233			(void)printf("uid\t%s\n", pw->pw_name);
234		else
235			(void)printf("uid\t%u\n", rid);
236
237		if ((eid = geteuid()) != rid) {
238			if ((pw = getpwuid(eid)))
239				(void)printf("euid\t%s\n", pw->pw_name);
240			else
241				(void)printf("euid\t%u\n", eid);
242		}
243		if ((rid = getgid()) != (eid = getegid())) {
244			if ((gr = getgrgid(rid)))
245				(void)printf("rgid\t%s\n", gr->gr_name);
246			else
247				(void)printf("rgid\t%u\n", rid);
248		}
249		(void)printf("groups\t");
250		group(NULL, 1);
251	}
252}
253
254void
255id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
256{
257	struct group *gr;
258	gid_t gid, egid, lastgid;
259	uid_t uid, euid;
260	int cnt, ngroups;
261	long ngroups_max;
262	gid_t *groups;
263	const char *fmt;
264
265	if (pw != NULL) {
266		uid = pw->pw_uid;
267		gid = pw->pw_gid;
268	}
269	else {
270		uid = getuid();
271		gid = getgid();
272	}
273
274	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
275	if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
276		err(1, "malloc");
277
278	if (use_ggl && pw != NULL) {
279		ngroups = ngroups_max;
280		getgrouplist(pw->pw_name, gid, groups, &ngroups);
281	}
282	else {
283		ngroups = getgroups(ngroups_max, groups);
284	}
285
286	if (pw != NULL)
287		printf("uid=%u(%s)", uid, pw->pw_name);
288	else
289		printf("uid=%u", getuid());
290	printf(" gid=%u", gid);
291	if ((gr = getgrgid(gid)))
292		(void)printf("(%s)", gr->gr_name);
293	if (p_euid && (euid = geteuid()) != uid) {
294		(void)printf(" euid=%u", euid);
295		if ((pw = getpwuid(euid)))
296			(void)printf("(%s)", pw->pw_name);
297	}
298	if (p_egid && (egid = getegid()) != gid) {
299		(void)printf(" egid=%u", egid);
300		if ((gr = getgrgid(egid)))
301			(void)printf("(%s)", gr->gr_name);
302	}
303	fmt = " groups=%u";
304	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
305		if (lastgid == (gid = groups[cnt]))
306			continue;
307		printf(fmt, gid);
308		fmt = ",%u";
309		if ((gr = getgrgid(gid)))
310			printf("(%s)", gr->gr_name);
311		lastgid = gid;
312	}
313	printf("\n");
314	free(groups);
315}
316
317#ifdef USE_BSM_AUDIT
318void
319auditid(void)
320{
321	auditinfo_t auditinfo;
322	auditinfo_addr_t ainfo_addr;
323	int ret, extended;
324
325	extended = 0;
326	ret = getaudit(&auditinfo);
327	if (ret < 0 && errno == E2BIG) {
328		if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
329			err(1, "getaudit_addr");
330		extended = 1;
331	} else if (ret < 0)
332		err(1, "getaudit");
333	if (extended != 0) {
334		(void) printf("auid=%d\n"
335		    "mask.success=0x%08x\n"
336		    "mask.failure=0x%08x\n"
337		    "asid=%d\n"
338		    "termid_addr.port=0x%08x\n"
339		    "termid_addr.addr[0]=0x%08x\n"
340		    "termid_addr.addr[1]=0x%08x\n"
341		    "termid_addr.addr[2]=0x%08x\n"
342		    "termid_addr.addr[3]=0x%08x\n",
343			ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
344			ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
345			ainfo_addr.ai_termid.at_port,
346			ainfo_addr.ai_termid.at_addr[0],
347			ainfo_addr.ai_termid.at_addr[1],
348			ainfo_addr.ai_termid.at_addr[2],
349			ainfo_addr.ai_termid.at_addr[3]);
350	} else {
351		(void) printf("auid=%d\n"
352		    "mask.success=0x%08x\n"
353		    "mask.failure=0x%08x\n"
354		    "asid=%d\n"
355		    "termid.port=0x%08x\n"
356		    "termid.machine=0x%08x\n",
357			auditinfo.ai_auid, auditinfo.ai_mask.am_success,
358			auditinfo.ai_mask.am_failure,
359			auditinfo.ai_asid, auditinfo.ai_termid.port,
360			auditinfo.ai_termid.machine);
361	}
362}
363#endif
364
365void
366group(struct passwd *pw, int nflag)
367{
368	struct group *gr;
369	int cnt, id, lastid, ngroups;
370	long ngroups_max;
371	gid_t *groups;
372	const char *fmt;
373
374	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
375	if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
376		err(1, "malloc");
377
378	if (pw) {
379		ngroups = ngroups_max;
380		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
381	} else {
382		ngroups = getgroups(ngroups_max, groups);
383	}
384	fmt = nflag ? "%s" : "%u";
385	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
386		if (lastid == (id = groups[cnt]))
387			continue;
388		if (nflag) {
389			if ((gr = getgrgid(id)))
390				(void)printf(fmt, gr->gr_name);
391			else
392				(void)printf(*fmt == ' ' ? " %u" : "%u",
393				    id);
394			fmt = " %s";
395		} else {
396			(void)printf(fmt, id);
397			fmt = " %u";
398		}
399		lastid = id;
400	}
401	(void)printf("\n");
402	free(groups);
403}
404
405void
406maclabel(void)
407{
408	char *string;
409	mac_t label;
410	int error;
411
412	error = mac_prepare_process_label(&label);
413	if (error == -1)
414		errx(1, "mac_prepare_type: %s", strerror(errno));
415
416	error = mac_get_proc(label);
417	if (error == -1)
418		errx(1, "mac_get_proc: %s", strerror(errno));
419
420	error = mac_to_text(label, &string);
421	if (error == -1)
422		errx(1, "mac_to_text: %s", strerror(errno));
423
424	(void)printf("%s\n", string);
425	mac_free(label);
426	free(string);
427}
428
429struct passwd *
430who(char *u)
431{
432	struct passwd *pw;
433	long id;
434	char *ep;
435
436	/*
437	 * Translate user argument into a pw pointer.  First, try to
438	 * get it as specified.  If that fails, try it as a number.
439	 */
440	if ((pw = getpwnam(u)))
441		return(pw);
442	id = strtol(u, &ep, 10);
443	if (*u && !*ep && (pw = getpwuid(id)))
444		return(pw);
445	errx(1, "%s: no such user", u);
446	/* NOTREACHED */
447}
448
449void
450pline(struct passwd *pw)
451{
452
453	if (!pw) {
454		if ((pw = getpwuid(getuid())) == NULL)
455			err(1, "getpwuid");
456	}
457
458	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
459			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
460			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
461			pw->pw_dir, pw->pw_shell);
462}
463
464
465void
466usage(void)
467{
468
469	if (isgroups)
470		(void)fprintf(stderr, "usage: groups [user]\n");
471	else if (iswhoami)
472		(void)fprintf(stderr, "usage: whoami\n");
473	else
474		(void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n",
475		    "usage: id [user]",
476#ifdef USE_BSM_AUDIT
477		    "       id -A\n",
478#else
479		    "",
480#endif
481		    "       id -G [-n] [user]",
482		    "       id -M",
483		    "       id -P [user]",
484		    "       id -g [-nr] [user]",
485		    "       id -p [user]",
486		    "       id -u [-nr] [user]");
487	exit(1);
488}
489