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
 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
 228 static void
 229 pretty(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
 268 static void
 269 id_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
 332 static void
 333 auditid(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
 379 static void
 380 group(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
 419 static void
 420 maclabel(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
 443 static struct passwd *
 444 who(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
 463 static void
 464 pline(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
 479 static void
 480 usage(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 }