usr.bin/id/id.c

   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("$FreeBSD$");
  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
  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
 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
 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
 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
 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
 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 *
 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
 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
 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 }