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 * 3. 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
33 static 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
40 static 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/12/usr.bin/id/id.c 370067 2021-07-04 04:15:44Z asomers $");
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
63 static void id_print(struct passwd *, int, int, int);
64 static void pline(struct passwd *);
65 static void pretty(struct passwd *);
66 #ifdef USE_BSM_AUDIT
67 static void auditid(void);
68 #endif
69 static void group(struct passwd *, int);
70 static void maclabel(void);
71 static void usage(void);
72 static struct passwd *who(char *);
73
74 static int isgroups, iswhoami;
75
76 int
main(int argc,char * argv[])77 main(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 if ((cflag || Aflag || Mflag) && argc > 0)
148 usage();
149
150 switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
151 case 1:
152 break;
153 case 0:
154 if (!nflag && !rflag)
155 break;
156 /* FALLTHROUGH */
157 default:
158 usage();
159 }
160
161 pw = *argv ? who(*argv) : NULL;
162
163 if (Mflag && pw != NULL)
164 usage();
165
166 #ifdef USE_BSM_AUDIT
167 if (Aflag) {
168 auditid();
169 exit(0);
170 }
171 #endif
172
173 if (cflag) {
174 error = getloginclass(loginclass, sizeof(loginclass));
175 if (error != 0)
176 err(1, "loginclass");
177 (void)printf("%s\n", loginclass);
178 exit(0);
179 }
180
181 if (gflag) {
182 id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
183 if (nflag && (gr = getgrgid(id)))
184 (void)printf("%s\n", gr->gr_name);
185 else
186 (void)printf("%u\n", id);
187 exit(0);
188 }
189
190 if (uflag) {
191 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
192 if (nflag && (pw = getpwuid(id)))
193 (void)printf("%s\n", pw->pw_name);
194 else
195 (void)printf("%u\n", id);
196 exit(0);
197 }
198
199 if (Gflag) {
200 group(pw, nflag);
201 exit(0);
202 }
203
204 if (Mflag) {
205 maclabel();
206 exit(0);
207 }
208
209 if (Pflag) {
210 pline(pw);
211 exit(0);
212 }
213
214 if (pflag) {
215 pretty(pw);
216 exit(0);
217 }
218
219 if (pw) {
220 id_print(pw, 1, 0, 0);
221 }
222 else {
223 id = getuid();
224 pw = getpwuid(id);
225 id_print(pw, 0, 1, 1);
226 }
227 exit(0);
228 }
229
230 static void
pretty(struct passwd * pw)231 pretty(struct passwd *pw)
232 {
233 struct group *gr;
234 u_int eid, rid;
235 char *login;
236
237 if (pw) {
238 (void)printf("uid\t%s\n", pw->pw_name);
239 (void)printf("groups\t");
240 group(pw, 1);
241 } else {
242 if ((login = getlogin()) == NULL)
243 err(1, "getlogin");
244
245 pw = getpwuid(rid = getuid());
246 if (pw == NULL || strcmp(login, pw->pw_name))
247 (void)printf("login\t%s\n", login);
248 if (pw)
249 (void)printf("uid\t%s\n", pw->pw_name);
250 else
251 (void)printf("uid\t%u\n", rid);
252
253 if ((eid = geteuid()) != rid) {
254 if ((pw = getpwuid(eid)))
255 (void)printf("euid\t%s\n", pw->pw_name);
256 else
257 (void)printf("euid\t%u\n", eid);
258 }
259 if ((rid = getgid()) != (eid = getegid())) {
260 if ((gr = getgrgid(rid)))
261 (void)printf("rgid\t%s\n", gr->gr_name);
262 else
263 (void)printf("rgid\t%u\n", rid);
264 }
265 (void)printf("groups\t");
266 group(NULL, 1);
267 }
268 }
269
270 static void
id_print(struct passwd * pw,int use_ggl,int p_euid,int p_egid)271 id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
272 {
273 struct group *gr;
274 gid_t gid, egid, lastgid;
275 uid_t uid, euid;
276 int cnt, ngroups;
277 long ngroups_max;
278 gid_t *groups;
279 const char *fmt;
280
281 if (pw != NULL) {
282 uid = pw->pw_uid;
283 gid = pw->pw_gid;
284 }
285 else {
286 uid = getuid();
287 gid = getgid();
288 }
289
290 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
291 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
292 err(1, "malloc");
293
294 if (use_ggl && pw != NULL) {
295 ngroups = ngroups_max;
296 getgrouplist(pw->pw_name, gid, groups, &ngroups);
297 }
298 else {
299 ngroups = getgroups(ngroups_max, groups);
300 }
301
302 if (pw != NULL)
303 printf("uid=%u(%s)", uid, pw->pw_name);
304 else
305 printf("uid=%u", getuid());
306 printf(" gid=%u", gid);
307 if ((gr = getgrgid(gid)))
308 (void)printf("(%s)", gr->gr_name);
309 if (p_euid && (euid = geteuid()) != uid) {
310 (void)printf(" euid=%u", euid);
311 if ((pw = getpwuid(euid)))
312 (void)printf("(%s)", pw->pw_name);
313 }
314 if (p_egid && (egid = getegid()) != gid) {
315 (void)printf(" egid=%u", egid);
316 if ((gr = getgrgid(egid)))
317 (void)printf("(%s)", gr->gr_name);
318 }
319 fmt = " groups=%u";
320 for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
321 if (lastgid == (gid = groups[cnt]))
322 continue;
323 printf(fmt, gid);
324 fmt = ",%u";
325 if ((gr = getgrgid(gid)))
326 printf("(%s)", gr->gr_name);
327 lastgid = gid;
328 }
329 printf("\n");
330 free(groups);
331 }
332
333 #ifdef USE_BSM_AUDIT
334 static void
auditid(void)335 auditid(void)
336 {
337 auditinfo_t auditinfo;
338 auditinfo_addr_t ainfo_addr;
339 int ret, extended;
340
341 extended = 0;
342 ret = getaudit(&auditinfo);
343 if (ret < 0 && errno == E2BIG) {
344 if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
345 err(1, "getaudit_addr");
346 extended = 1;
347 } else if (ret < 0)
348 err(1, "getaudit");
349 if (extended != 0) {
350 (void) printf("auid=%d\n"
351 "mask.success=0x%08x\n"
352 "mask.failure=0x%08x\n"
353 "asid=%d\n"
354 "termid_addr.port=0x%08jx\n"
355 "termid_addr.addr[0]=0x%08x\n"
356 "termid_addr.addr[1]=0x%08x\n"
357 "termid_addr.addr[2]=0x%08x\n"
358 "termid_addr.addr[3]=0x%08x\n",
359 ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
360 ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
361 (uintmax_t)ainfo_addr.ai_termid.at_port,
362 ainfo_addr.ai_termid.at_addr[0],
363 ainfo_addr.ai_termid.at_addr[1],
364 ainfo_addr.ai_termid.at_addr[2],
365 ainfo_addr.ai_termid.at_addr[3]);
366 } else {
367 (void) printf("auid=%d\n"
368 "mask.success=0x%08x\n"
369 "mask.failure=0x%08x\n"
370 "asid=%d\n"
371 "termid.port=0x%08jx\n"
372 "termid.machine=0x%08x\n",
373 auditinfo.ai_auid, auditinfo.ai_mask.am_success,
374 auditinfo.ai_mask.am_failure,
375 auditinfo.ai_asid, (uintmax_t)auditinfo.ai_termid.port,
376 auditinfo.ai_termid.machine);
377 }
378 }
379 #endif
380
381 static void
group(struct passwd * pw,int nflag)382 group(struct passwd *pw, int nflag)
383 {
384 struct group *gr;
385 int cnt, id, lastid, ngroups;
386 long ngroups_max;
387 gid_t *groups;
388 const char *fmt;
389
390 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
391 if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
392 err(1, "malloc");
393
394 if (pw) {
395 ngroups = ngroups_max;
396 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
397 } else {
398 ngroups = getgroups(ngroups_max, groups);
399 }
400 fmt = nflag ? "%s" : "%u";
401 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
402 if (lastid == (id = groups[cnt]))
403 continue;
404 if (nflag) {
405 if ((gr = getgrgid(id)))
406 (void)printf(fmt, gr->gr_name);
407 else
408 (void)printf(*fmt == ' ' ? " %u" : "%u",
409 id);
410 fmt = " %s";
411 } else {
412 (void)printf(fmt, id);
413 fmt = " %u";
414 }
415 lastid = id;
416 }
417 (void)printf("\n");
418 free(groups);
419 }
420
421 static void
maclabel(void)422 maclabel(void)
423 {
424 char *string;
425 mac_t label;
426 int error;
427
428 error = mac_prepare_process_label(&label);
429 if (error == -1)
430 errx(1, "mac_prepare_type: %s", strerror(errno));
431
432 error = mac_get_proc(label);
433 if (error == -1)
434 errx(1, "mac_get_proc: %s", strerror(errno));
435
436 error = mac_to_text(label, &string);
437 if (error == -1)
438 errx(1, "mac_to_text: %s", strerror(errno));
439
440 (void)printf("%s\n", string);
441 mac_free(label);
442 free(string);
443 }
444
445 static struct passwd *
who(char * u)446 who(char *u)
447 {
448 struct passwd *pw;
449 long id;
450 char *ep;
451
452 /*
453 * Translate user argument into a pw pointer. First, try to
454 * get it as specified. If that fails, try it as a number.
455 */
456 if ((pw = getpwnam(u)))
457 return(pw);
458 id = strtol(u, &ep, 10);
459 if (*u && !*ep && (pw = getpwuid(id)))
460 return(pw);
461 errx(1, "%s: no such user", u);
462 /* NOTREACHED */
463 }
464
465 static void
pline(struct passwd * pw)466 pline(struct passwd *pw)
467 {
468
469 if (!pw) {
470 if ((pw = getpwuid(getuid())) == NULL)
471 err(1, "getpwuid");
472 }
473
474 (void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
475 pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
476 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
477 pw->pw_dir, pw->pw_shell);
478 }
479
480
481 static void
usage(void)482 usage(void)
483 {
484
485 if (isgroups)
486 (void)fprintf(stderr, "usage: groups [user]\n");
487 else if (iswhoami)
488 (void)fprintf(stderr, "usage: whoami\n");
489 else
490 (void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
491 "usage: id [user]",
492 #ifdef USE_BSM_AUDIT
493 " id -A\n",
494 #else
495 "",
496 #endif
497 " id -G [-n] [user]",
498 " id -M",
499 " id -P [user]",
500 " id -c",
501 " id -g [-nr] [user]",
502 " id -p [user]",
503 " id -u [-nr] [user]");
504 exit(1);
505 }
506