id.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1991, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)id.c	8.2 (Berkeley) 2/16/94";
41#endif
42#endif /* not lint */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: stable/11/usr.bin/id/id.c 330897 2018-03-14 03:19:51Z eadler $");
45
46#include <sys/param.h>
47#include <sys/mac.h>
48
49#ifdef USE_BSM_AUDIT
50#include <bsm/audit.h>
51#endif
52
53#include <err.h>
54#include <errno.h>
55#include <grp.h>
56#include <pwd.h>
57#include <stdint.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62
63static void	id_print(struct passwd *, int, int, int);
64static void	pline(struct passwd *);
65static void	pretty(struct passwd *);
66#ifdef USE_BSM_AUDIT
67static void	auditid(void);
68#endif
69static void	group(struct passwd *, int);
70static void	maclabel(void);
71static void	usage(void);
72static struct passwd *who(char *);
73
74static int isgroups, iswhoami;
75
76int
77main(int argc, char *argv[])
78{
79	struct group *gr;
80	struct passwd *pw;
81	int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
82	int Aflag, cflag;
83	int error;
84	const char *myname;
85	char loginclass[MAXLOGNAME];
86
87	Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
88	Aflag = cflag = 0;
89
90	myname = strrchr(argv[0], '/');
91	myname = (myname != NULL) ? myname + 1 : argv[0];
92	if (strcmp(myname, "groups") == 0) {
93		isgroups = 1;
94		Gflag = nflag = 1;
95	}
96	else if (strcmp(myname, "whoami") == 0) {
97		iswhoami = 1;
98		uflag = nflag = 1;
99	}
100
101	while ((ch = getopt(argc, argv,
102	    (isgroups || iswhoami) ? "" : "APGMacgnpru")) != -1)
103		switch(ch) {
104#ifdef USE_BSM_AUDIT
105		case 'A':
106			Aflag = 1;
107			break;
108#endif
109		case 'G':
110			Gflag = 1;
111			break;
112		case 'M':
113			Mflag = 1;
114			break;
115		case 'P':
116			Pflag = 1;
117			break;
118		case 'a':
119			break;
120		case 'c':
121			cflag = 1;
122			break;
123		case 'g':
124			gflag = 1;
125			break;
126		case 'n':
127			nflag = 1;
128			break;
129		case 'p':
130			pflag = 1;
131			break;
132		case 'r':
133			rflag = 1;
134			break;
135		case 'u':
136			uflag = 1;
137			break;
138		case '?':
139		default:
140			usage();
141		}
142	argc -= optind;
143	argv += optind;
144
145	if (iswhoami && argc > 0)
146		usage();
147
148	switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
149	case 1:
150		break;
151	case 0:
152		if (!nflag && !rflag)
153			break;
154		/* FALLTHROUGH */
155	default:
156		usage();
157	}
158
159	pw = *argv ? who(*argv) : NULL;
160
161	if (Mflag && pw != NULL)
162		usage();
163
164#ifdef USE_BSM_AUDIT
165	if (Aflag) {
166		auditid();
167		exit(0);
168	}
169#endif
170
171	if (cflag) {
172		error = getloginclass(loginclass, sizeof(loginclass));
173		if (error != 0)
174			err(1, "loginclass");
175		(void)printf("%s\n", loginclass);
176		exit(0);
177	}
178
179	if (gflag) {
180		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
181		if (nflag && (gr = getgrgid(id)))
182			(void)printf("%s\n", gr->gr_name);
183		else
184			(void)printf("%u\n", id);
185		exit(0);
186	}
187
188	if (uflag) {
189		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
190		if (nflag && (pw = getpwuid(id)))
191			(void)printf("%s\n", pw->pw_name);
192		else
193			(void)printf("%u\n", id);
194		exit(0);
195	}
196
197	if (Gflag) {
198		group(pw, nflag);
199		exit(0);
200	}
201
202	if (Mflag) {
203		maclabel();
204		exit(0);
205	}
206
207	if (Pflag) {
208		pline(pw);
209		exit(0);
210	}
211
212	if (pflag) {
213		pretty(pw);
214		exit(0);
215	}
216
217	if (pw) {
218		id_print(pw, 1, 0, 0);
219	}
220	else {
221		id = getuid();
222		pw = getpwuid(id);
223		id_print(pw, 0, 1, 1);
224	}
225	exit(0);
226}
227
228static void
229pretty(struct passwd *pw)
230{
231	struct group *gr;
232	u_int eid, rid;
233	char *login;
234
235	if (pw) {
236		(void)printf("uid\t%s\n", pw->pw_name);
237		(void)printf("groups\t");
238		group(pw, 1);
239	} else {
240		if ((login = getlogin()) == NULL)
241			err(1, "getlogin");
242
243		pw = getpwuid(rid = getuid());
244		if (pw == NULL || strcmp(login, pw->pw_name))
245			(void)printf("login\t%s\n", login);
246		if (pw)
247			(void)printf("uid\t%s\n", pw->pw_name);
248		else
249			(void)printf("uid\t%u\n", rid);
250
251		if ((eid = geteuid()) != rid) {
252			if ((pw = getpwuid(eid)))
253				(void)printf("euid\t%s\n", pw->pw_name);
254			else
255				(void)printf("euid\t%u\n", eid);
256		}
257		if ((rid = getgid()) != (eid = getegid())) {
258			if ((gr = getgrgid(rid)))
259				(void)printf("rgid\t%s\n", gr->gr_name);
260			else
261				(void)printf("rgid\t%u\n", rid);
262		}
263		(void)printf("groups\t");
264		group(NULL, 1);
265	}
266}
267
268static void
269id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
270{
271	struct group *gr;
272	gid_t gid, egid, lastgid;
273	uid_t uid, euid;
274	int cnt, ngroups;
275	long ngroups_max;
276	gid_t *groups;
277	const char *fmt;
278
279	if (pw != NULL) {
280		uid = pw->pw_uid;
281		gid = pw->pw_gid;
282	}
283	else {
284		uid = getuid();
285		gid = getgid();
286	}
287
288	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
289	if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
290		err(1, "malloc");
291
292	if (use_ggl && pw != NULL) {
293		ngroups = ngroups_max;
294		getgrouplist(pw->pw_name, gid, groups, &ngroups);
295	}
296	else {
297		ngroups = getgroups(ngroups_max, groups);
298	}
299
300	if (pw != NULL)
301		printf("uid=%u(%s)", uid, pw->pw_name);
302	else
303		printf("uid=%u", getuid());
304	printf(" gid=%u", gid);
305	if ((gr = getgrgid(gid)))
306		(void)printf("(%s)", gr->gr_name);
307	if (p_euid && (euid = geteuid()) != uid) {
308		(void)printf(" euid=%u", euid);
309		if ((pw = getpwuid(euid)))
310			(void)printf("(%s)", pw->pw_name);
311	}
312	if (p_egid && (egid = getegid()) != gid) {
313		(void)printf(" egid=%u", egid);
314		if ((gr = getgrgid(egid)))
315			(void)printf("(%s)", gr->gr_name);
316	}
317	fmt = " groups=%u";
318	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
319		if (lastgid == (gid = groups[cnt]))
320			continue;
321		printf(fmt, gid);
322		fmt = ",%u";
323		if ((gr = getgrgid(gid)))
324			printf("(%s)", gr->gr_name);
325		lastgid = gid;
326	}
327	printf("\n");
328	free(groups);
329}
330
331#ifdef USE_BSM_AUDIT
332static void
333auditid(void)
334{
335	auditinfo_t auditinfo;
336	auditinfo_addr_t ainfo_addr;
337	int ret, extended;
338
339	extended = 0;
340	ret = getaudit(&auditinfo);
341	if (ret < 0 && errno == E2BIG) {
342		if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
343			err(1, "getaudit_addr");
344		extended = 1;
345	} else if (ret < 0)
346		err(1, "getaudit");
347	if (extended != 0) {
348		(void) printf("auid=%d\n"
349		    "mask.success=0x%08x\n"
350		    "mask.failure=0x%08x\n"
351		    "asid=%d\n"
352		    "termid_addr.port=0x%08jx\n"
353		    "termid_addr.addr[0]=0x%08x\n"
354		    "termid_addr.addr[1]=0x%08x\n"
355		    "termid_addr.addr[2]=0x%08x\n"
356		    "termid_addr.addr[3]=0x%08x\n",
357			ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
358			ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
359			(uintmax_t)ainfo_addr.ai_termid.at_port,
360			ainfo_addr.ai_termid.at_addr[0],
361			ainfo_addr.ai_termid.at_addr[1],
362			ainfo_addr.ai_termid.at_addr[2],
363			ainfo_addr.ai_termid.at_addr[3]);
364	} else {
365		(void) printf("auid=%d\n"
366		    "mask.success=0x%08x\n"
367		    "mask.failure=0x%08x\n"
368		    "asid=%d\n"
369		    "termid.port=0x%08jx\n"
370		    "termid.machine=0x%08x\n",
371			auditinfo.ai_auid, auditinfo.ai_mask.am_success,
372			auditinfo.ai_mask.am_failure,
373			auditinfo.ai_asid, (uintmax_t)auditinfo.ai_termid.port,
374			auditinfo.ai_termid.machine);
375	}
376}
377#endif
378
379static void
380group(struct passwd *pw, int nflag)
381{
382	struct group *gr;
383	int cnt, id, lastid, ngroups;
384	long ngroups_max;
385	gid_t *groups;
386	const char *fmt;
387
388	ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
389	if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
390		err(1, "malloc");
391
392	if (pw) {
393		ngroups = ngroups_max;
394		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
395	} else {
396		ngroups = getgroups(ngroups_max, groups);
397	}
398	fmt = nflag ? "%s" : "%u";
399	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
400		if (lastid == (id = groups[cnt]))
401			continue;
402		if (nflag) {
403			if ((gr = getgrgid(id)))
404				(void)printf(fmt, gr->gr_name);
405			else
406				(void)printf(*fmt == ' ' ? " %u" : "%u",
407				    id);
408			fmt = " %s";
409		} else {
410			(void)printf(fmt, id);
411			fmt = " %u";
412		}
413		lastid = id;
414	}
415	(void)printf("\n");
416	free(groups);
417}
418
419static void
420maclabel(void)
421{
422	char *string;
423	mac_t label;
424	int error;
425
426	error = mac_prepare_process_label(&label);
427	if (error == -1)
428		errx(1, "mac_prepare_type: %s", strerror(errno));
429
430	error = mac_get_proc(label);
431	if (error == -1)
432		errx(1, "mac_get_proc: %s", strerror(errno));
433
434	error = mac_to_text(label, &string);
435	if (error == -1)
436		errx(1, "mac_to_text: %s", strerror(errno));
437
438	(void)printf("%s\n", string);
439	mac_free(label);
440	free(string);
441}
442
443static struct passwd *
444who(char *u)
445{
446	struct passwd *pw;
447	long id;
448	char *ep;
449
450	/*
451	 * Translate user argument into a pw pointer.  First, try to
452	 * get it as specified.  If that fails, try it as a number.
453	 */
454	if ((pw = getpwnam(u)))
455		return(pw);
456	id = strtol(u, &ep, 10);
457	if (*u && !*ep && (pw = getpwuid(id)))
458		return(pw);
459	errx(1, "%s: no such user", u);
460	/* NOTREACHED */
461}
462
463static void
464pline(struct passwd *pw)
465{
466
467	if (!pw) {
468		if ((pw = getpwuid(getuid())) == NULL)
469			err(1, "getpwuid");
470	}
471
472	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
473			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
474			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
475			pw->pw_dir, pw->pw_shell);
476}
477
478
479static void
480usage(void)
481{
482
483	if (isgroups)
484		(void)fprintf(stderr, "usage: groups [user]\n");
485	else if (iswhoami)
486		(void)fprintf(stderr, "usage: whoami\n");
487	else
488		(void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
489		    "usage: id [user]",
490#ifdef USE_BSM_AUDIT
491		    "       id -A\n",
492#else
493		    "",
494#endif
495		    "       id -G [-n] [user]",
496		    "       id -M",
497		    "       id -P [user]",
498		    "       id -c",
499		    "       id -g [-nr] [user]",
500		    "       id -p [user]",
501		    "       id -u [-nr] [user]");
502	exit(1);
503}
504