id.c revision 227166 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1991, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)id.c	8.2 (Berkeley) 2/16/94";
39#endif
40#endif /* not lint */
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/usr.bin/id/id.c 227166 2011-11-06 08:15:30Z ed $");
43
44#include <sys/param.h>
45#include <sys/mac.h>
46
47#ifdef USE_BSM_AUDIT
48#include <bsm/audit.h>
49#endif
50
51#include <err.h>
52#include <errno.h>
53#include <grp.h>
54#include <pwd.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60static void	id_print(struct passwd *, int, int, int);
61static void	pline(struct passwd *);
62static void	pretty(struct passwd *);
63static void	auditid(void);
64static void	group(struct passwd *, int);
65static void	maclabel(void);
66static void	usage(void);
67static struct passwd *who(char *);
68
69static int isgroups, iswhoami;
70
71int
72main(int argc, char *argv[])
73{
74	struct group *gr;
75	struct passwd *pw;
76	int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
77	int Aflag, cflag;
78	int error;
79	const char *myname;
80	char loginclass[MAXLOGNAME];
81
82	Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
83	Aflag = cflag = 0;
84
85	myname = strrchr(argv[0], '/');
86	myname = (myname != NULL) ? myname + 1 : argv[0];
87	if (strcmp(myname, "groups") == 0) {
88		isgroups = 1;
89		Gflag = nflag = 1;
90	}
91	else if (strcmp(myname, "whoami") == 0) {
92		iswhoami = 1;
93		uflag = nflag = 1;
94	}
95
96	while ((ch = getopt(argc, argv,
97	    (isgroups || iswhoami) ? "" : "APGMacgnpru")) != -1)
98		switch(ch) {
99#ifdef USE_BSM_AUDIT
100		case 'A':
101			Aflag = 1;
102			break;
103#endif
104		case 'G':
105			Gflag = 1;
106			break;
107		case 'M':
108			Mflag = 1;
109			break;
110		case 'P':
111			Pflag = 1;
112			break;
113		case 'a':
114			break;
115		case 'c':
116			cflag = 1;
117			break;
118		case 'g':
119			gflag = 1;
120			break;
121		case 'n':
122			nflag = 1;
123			break;
124		case 'p':
125			pflag = 1;
126			break;
127		case 'r':
128			rflag = 1;
129			break;
130		case 'u':
131			uflag = 1;
132			break;
133		case '?':
134		default:
135			usage();
136		}
137	argc -= optind;
138	argv += optind;
139
140	if (iswhoami && argc > 0)
141		usage();
142
143	switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
144	case 1:
145		break;
146	case 0:
147		if (!nflag && !rflag)
148			break;
149		/* FALLTHROUGH */
150	default:
151		usage();
152	}
153
154	pw = *argv ? who(*argv) : NULL;
155
156	if (Mflag && pw != NULL)
157		usage();
158
159#ifdef USE_BSM_AUDIT
160	if (Aflag) {
161		auditid();
162		exit(0);
163	}
164#endif
165
166	if (cflag) {
167		error = getloginclass(loginclass, sizeof(loginclass));
168		if (error != 0)
169			err(1, "loginclass");
170		(void)printf("%s\n", loginclass);
171		exit(0);
172	}
173
174	if (gflag) {
175		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
176		if (nflag && (gr = getgrgid(id)))
177			(void)printf("%s\n", gr->gr_name);
178		else
179			(void)printf("%u\n", id);
180		exit(0);
181	}
182
183	if (uflag) {
184		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
185		if (nflag && (pw = getpwuid(id)))
186			(void)printf("%s\n", pw->pw_name);
187		else
188			(void)printf("%u\n", id);
189		exit(0);
190	}
191
192	if (Gflag) {
193		group(pw, nflag);
194		exit(0);
195	}
196
197	if (Mflag) {
198		maclabel();
199		exit(0);
200	}
201
202	if (Pflag) {
203		pline(pw);
204		exit(0);
205	}
206
207	if (pflag) {
208		pretty(pw);
209		exit(0);
210	}
211
212	if (pw) {
213		id_print(pw, 1, 0, 0);
214	}
215	else {
216		id = getuid();
217		pw = getpwuid(id);
218		id_print(pw, 0, 1, 1);
219	}
220	exit(0);
221}
222
223static void
224pretty(struct passwd *pw)
225{
226	struct group *gr;
227	u_int eid, rid;
228	char *login;
229
230	if (pw) {
231		(void)printf("uid\t%s\n", pw->pw_name);
232		(void)printf("groups\t");
233		group(pw, 1);
234	} else {
235		if ((login = getlogin()) == NULL)
236			err(1, "getlogin");
237
238		pw = getpwuid(rid = getuid());
239		if (pw == NULL || strcmp(login, pw->pw_name))
240			(void)printf("login\t%s\n", login);
241		if (pw)
242			(void)printf("uid\t%s\n", pw->pw_name);
243		else
244			(void)printf("uid\t%u\n", rid);
245
246		if ((eid = geteuid()) != rid) {
247			if ((pw = getpwuid(eid)))
248				(void)printf("euid\t%s\n", pw->pw_name);
249			else
250				(void)printf("euid\t%u\n", eid);
251		}
252		if ((rid = getgid()) != (eid = getegid())) {
253			if ((gr = getgrgid(rid)))
254				(void)printf("rgid\t%s\n", gr->gr_name);
255			else
256				(void)printf("rgid\t%u\n", rid);
257		}
258		(void)printf("groups\t");
259		group(NULL, 1);
260	}
261}
262
263static void
264id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
265{
266	struct group *gr;
267	gid_t gid, egid, lastgid;
268	uid_t uid, euid;
269	int cnt, ngroups;
270	long ngroups_max;
271	gid_t *groups;
272	const char *fmt;
273
274	if (pw != NULL) {
275		uid = pw->pw_uid;
276		gid = pw->pw_gid;
277	}
278	else {
279		uid = getuid();
280		gid = getgid();
281	}
282
283	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
284	if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
285		err(1, "malloc");
286
287	if (use_ggl && pw != NULL) {
288		ngroups = ngroups_max;
289		getgrouplist(pw->pw_name, gid, groups, &ngroups);
290	}
291	else {
292		ngroups = getgroups(ngroups_max, groups);
293	}
294
295	if (pw != NULL)
296		printf("uid=%u(%s)", uid, pw->pw_name);
297	else
298		printf("uid=%u", getuid());
299	printf(" gid=%u", gid);
300	if ((gr = getgrgid(gid)))
301		(void)printf("(%s)", gr->gr_name);
302	if (p_euid && (euid = geteuid()) != uid) {
303		(void)printf(" euid=%u", euid);
304		if ((pw = getpwuid(euid)))
305			(void)printf("(%s)", pw->pw_name);
306	}
307	if (p_egid && (egid = getegid()) != gid) {
308		(void)printf(" egid=%u", egid);
309		if ((gr = getgrgid(egid)))
310			(void)printf("(%s)", gr->gr_name);
311	}
312	fmt = " groups=%u";
313	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
314		if (lastgid == (gid = groups[cnt]))
315			continue;
316		printf(fmt, gid);
317		fmt = ",%u";
318		if ((gr = getgrgid(gid)))
319			printf("(%s)", gr->gr_name);
320		lastgid = gid;
321	}
322	printf("\n");
323	free(groups);
324}
325
326#ifdef USE_BSM_AUDIT
327static void
328auditid(void)
329{
330	auditinfo_t auditinfo;
331	auditinfo_addr_t ainfo_addr;
332	int ret, extended;
333
334	extended = 0;
335	ret = getaudit(&auditinfo);
336	if (ret < 0 && errno == E2BIG) {
337		if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
338			err(1, "getaudit_addr");
339		extended = 1;
340	} else if (ret < 0)
341		err(1, "getaudit");
342	if (extended != 0) {
343		(void) printf("auid=%d\n"
344		    "mask.success=0x%08x\n"
345		    "mask.failure=0x%08x\n"
346		    "asid=%d\n"
347		    "termid_addr.port=0x%08x\n"
348		    "termid_addr.addr[0]=0x%08x\n"
349		    "termid_addr.addr[1]=0x%08x\n"
350		    "termid_addr.addr[2]=0x%08x\n"
351		    "termid_addr.addr[3]=0x%08x\n",
352			ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
353			ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
354			ainfo_addr.ai_termid.at_port,
355			ainfo_addr.ai_termid.at_addr[0],
356			ainfo_addr.ai_termid.at_addr[1],
357			ainfo_addr.ai_termid.at_addr[2],
358			ainfo_addr.ai_termid.at_addr[3]);
359	} else {
360		(void) printf("auid=%d\n"
361		    "mask.success=0x%08x\n"
362		    "mask.failure=0x%08x\n"
363		    "asid=%d\n"
364		    "termid.port=0x%08x\n"
365		    "termid.machine=0x%08x\n",
366			auditinfo.ai_auid, auditinfo.ai_mask.am_success,
367			auditinfo.ai_mask.am_failure,
368			auditinfo.ai_asid, auditinfo.ai_termid.port,
369			auditinfo.ai_termid.machine);
370	}
371}
372#endif
373
374static void
375group(struct passwd *pw, int nflag)
376{
377	struct group *gr;
378	int cnt, id, lastid, ngroups;
379	long ngroups_max;
380	gid_t *groups;
381	const char *fmt;
382
383	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
384	if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
385		err(1, "malloc");
386
387	if (pw) {
388		ngroups = ngroups_max;
389		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
390	} else {
391		ngroups = getgroups(ngroups_max, groups);
392	}
393	fmt = nflag ? "%s" : "%u";
394	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
395		if (lastid == (id = groups[cnt]))
396			continue;
397		if (nflag) {
398			if ((gr = getgrgid(id)))
399				(void)printf(fmt, gr->gr_name);
400			else
401				(void)printf(*fmt == ' ' ? " %u" : "%u",
402				    id);
403			fmt = " %s";
404		} else {
405			(void)printf(fmt, id);
406			fmt = " %u";
407		}
408		lastid = id;
409	}
410	(void)printf("\n");
411	free(groups);
412}
413
414static void
415maclabel(void)
416{
417	char *string;
418	mac_t label;
419	int error;
420
421	error = mac_prepare_process_label(&label);
422	if (error == -1)
423		errx(1, "mac_prepare_type: %s", strerror(errno));
424
425	error = mac_get_proc(label);
426	if (error == -1)
427		errx(1, "mac_get_proc: %s", strerror(errno));
428
429	error = mac_to_text(label, &string);
430	if (error == -1)
431		errx(1, "mac_to_text: %s", strerror(errno));
432
433	(void)printf("%s\n", string);
434	mac_free(label);
435	free(string);
436}
437
438static struct passwd *
439who(char *u)
440{
441	struct passwd *pw;
442	long id;
443	char *ep;
444
445	/*
446	 * Translate user argument into a pw pointer.  First, try to
447	 * get it as specified.  If that fails, try it as a number.
448	 */
449	if ((pw = getpwnam(u)))
450		return(pw);
451	id = strtol(u, &ep, 10);
452	if (*u && !*ep && (pw = getpwuid(id)))
453		return(pw);
454	errx(1, "%s: no such user", u);
455	/* NOTREACHED */
456}
457
458static void
459pline(struct passwd *pw)
460{
461
462	if (!pw) {
463		if ((pw = getpwuid(getuid())) == NULL)
464			err(1, "getpwuid");
465	}
466
467	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
468			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
469			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
470			pw->pw_dir, pw->pw_shell);
471}
472
473
474static void
475usage(void)
476{
477
478	if (isgroups)
479		(void)fprintf(stderr, "usage: groups [user]\n");
480	else if (iswhoami)
481		(void)fprintf(stderr, "usage: whoami\n");
482	else
483		(void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
484		    "usage: id [user]",
485#ifdef USE_BSM_AUDIT
486		    "       id -A\n",
487#else
488		    "",
489#endif
490		    "       id -G [-n] [user]",
491		    "       id -M",
492		    "       id -P [user]",
493		    "       id -c",
494		    "       id -g [-nr] [user]",
495		    "       id -p [user]",
496		    "       id -u [-nr] [user]");
497	exit(1);
498}
499