usr.bin/id/id.c

   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  * 3. 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
  31 static 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
  38 static char sccsid[] = "@(#)id.c        8.2 (Berkeley) 2/16/94";
  39 #endif
  40 #endif /* not lint */
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  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 <stdint.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 static void     id_print(struct passwd *, int, int, int);
  62 static void     pline(struct passwd *);
  63 static void     pretty(struct passwd *);
  64 #ifdef USE_BSM_AUDIT
  65 static void     auditid(void);
  66 #endif
  67 static void     group(struct passwd *, int);
  68 static void     maclabel(void);
  69 static void     usage(void);
  70 static struct passwd *who(char *);
  71
  72 static int isgroups, iswhoami;
  73
  74 int
  75 main(int argc, char *argv[])
  76 {
  77         struct group *gr;
  78         struct passwd *pw;
  79         int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
  80         int Aflag, cflag;
  81         int error;
  82         const char *myname;
  83         char loginclass[MAXLOGNAME];
  84
  85         Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
  86         Aflag = cflag = 0;
  87
  88         myname = strrchr(argv[0], '/');
  89         myname = (myname != NULL) ? myname + 1 : argv[0];
  90         if (strcmp(myname, "groups") == 0) {
  91                 isgroups = 1;
  92                 Gflag = nflag = 1;
  93         }
  94         else if (strcmp(myname, "whoami") == 0) {
  95                 iswhoami = 1;
  96                 uflag = nflag = 1;
  97         }
  98
  99         while ((ch = getopt(argc, argv,
 100             (isgroups || iswhoami) ? "" : "APGMacgnpru")) != -1)
 101                 switch(ch) {
 102 #ifdef USE_BSM_AUDIT
 103                 case 'A':
 104                         Aflag = 1;
 105                         break;
 106 #endif
 107                 case 'G':
 108                         Gflag = 1;
 109                         break;
 110                 case 'M':
 111                         Mflag = 1;
 112                         break;
 113                 case 'P':
 114                         Pflag = 1;
 115                         break;
 116                 case 'a':
 117                         break;
 118                 case 'c':
 119                         cflag = 1;
 120                         break;
 121                 case 'g':
 122                         gflag = 1;
 123                         break;
 124                 case 'n':
 125                         nflag = 1;
 126                         break;
 127                 case 'p':
 128                         pflag = 1;
 129                         break;
 130                 case 'r':
 131                         rflag = 1;
 132                         break;
 133                 case 'u':
 134                         uflag = 1;
 135                         break;
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140         argc -= optind;
 141         argv += optind;
 142
 143         if (iswhoami && argc > 0)
 144                 usage();
 145
 146         switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
 147         case 1:
 148                 break;
 149         case 0:
 150                 if (!nflag && !rflag)
 151                         break;
 152                 /* FALLTHROUGH */
 153         default:
 154                 usage();
 155         }
 156
 157         pw = *argv ? who(*argv) : NULL;
 158
 159         if (Mflag && pw != NULL)
 160                 usage();
 161
 162 #ifdef USE_BSM_AUDIT
 163         if (Aflag) {
 164                 auditid();
 165                 exit(0);
 166         }
 167 #endif
 168
 169         if (cflag) {
 170                 error = getloginclass(loginclass, sizeof(loginclass));
 171                 if (error != 0)
 172                         err(1, "loginclass");
 173                 (void)printf("%s\n", loginclass);
 174                 exit(0);
 175         }
 176
 177         if (gflag) {
 178                 id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
 179                 if (nflag && (gr = getgrgid(id)))
 180                         (void)printf("%s\n", gr->gr_name);
 181                 else
 182                         (void)printf("%u\n", id);
 183                 exit(0);
 184         }
 185
 186         if (uflag) {
 187                 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
 188                 if (nflag && (pw = getpwuid(id)))
 189                         (void)printf("%s\n", pw->pw_name);
 190                 else
 191                         (void)printf("%u\n", id);
 192                 exit(0);
 193         }
 194
 195         if (Gflag) {
 196                 group(pw, nflag);
 197                 exit(0);
 198         }
 199
 200         if (Mflag) {
 201                 maclabel();
 202                 exit(0);
 203         }
 204
 205         if (Pflag) {
 206                 pline(pw);
 207                 exit(0);
 208         }
 209
 210         if (pflag) {
 211                 pretty(pw);
 212                 exit(0);
 213         }
 214
 215         if (pw) {
 216                 id_print(pw, 1, 0, 0);
 217         }
 218         else {
 219                 id = getuid();
 220                 pw = getpwuid(id);
 221                 id_print(pw, 0, 1, 1);
 222         }
 223         exit(0);
 224 }
 225
 226 static void
 227 pretty(struct passwd *pw)
 228 {
 229         struct group *gr;
 230         u_int eid, rid;
 231         char *login;
 232
 233         if (pw) {
 234                 (void)printf("uid\t%s\n", pw->pw_name);
 235                 (void)printf("groups\t");
 236                 group(pw, 1);
 237         } else {
 238                 if ((login = getlogin()) == NULL)
 239                         err(1, "getlogin");
 240
 241                 pw = getpwuid(rid = getuid());
 242                 if (pw == NULL || strcmp(login, pw->pw_name))
 243                         (void)printf("login\t%s\n", login);
 244                 if (pw)
 245                         (void)printf("uid\t%s\n", pw->pw_name);
 246                 else
 247                         (void)printf("uid\t%u\n", rid);
 248
 249                 if ((eid = geteuid()) != rid) {
 250                         if ((pw = getpwuid(eid)))
 251                                 (void)printf("euid\t%s\n", pw->pw_name);
 252                         else
 253                                 (void)printf("euid\t%u\n", eid);
 254                 }
 255                 if ((rid = getgid()) != (eid = getegid())) {
 256                         if ((gr = getgrgid(rid)))
 257                                 (void)printf("rgid\t%s\n", gr->gr_name);
 258                         else
 259                                 (void)printf("rgid\t%u\n", rid);
 260                 }
 261                 (void)printf("groups\t");
 262                 group(NULL, 1);
 263         }
 264 }
 265
 266 static void
 267 id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
 268 {
 269         struct group *gr;
 270         gid_t gid, egid, lastgid;
 271         uid_t uid, euid;
 272         int cnt, ngroups;
 273         long ngroups_max;
 274         gid_t *groups;
 275         const char *fmt;
 276
 277         if (pw != NULL) {
 278                 uid = pw->pw_uid;
 279                 gid = pw->pw_gid;
 280         }
 281         else {
 282                 uid = getuid();
 283                 gid = getgid();
 284         }
 285
 286         ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
 287         if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
 288                 err(1, "malloc");
 289
 290         if (use_ggl && pw != NULL) {
 291                 ngroups = ngroups_max;
 292                 getgrouplist(pw->pw_name, gid, groups, &ngroups);
 293         }
 294         else {
 295                 ngroups = getgroups(ngroups_max, groups);
 296         }
 297
 298         if (pw != NULL)
 299                 printf("uid=%u(%s)", uid, pw->pw_name);
 300         else
 301                 printf("uid=%u", getuid());
 302         printf(" gid=%u", gid);
 303         if ((gr = getgrgid(gid)))
 304                 (void)printf("(%s)", gr->gr_name);
 305         if (p_euid && (euid = geteuid()) != uid) {
 306                 (void)printf(" euid=%u", euid);
 307                 if ((pw = getpwuid(euid)))
 308                         (void)printf("(%s)", pw->pw_name);
 309         }
 310         if (p_egid && (egid = getegid()) != gid) {
 311                 (void)printf(" egid=%u", egid);
 312                 if ((gr = getgrgid(egid)))
 313                         (void)printf("(%s)", gr->gr_name);
 314         }
 315         fmt = " groups=%u";
 316         for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
 317                 if (lastgid == (gid = groups[cnt]))
 318                         continue;
 319                 printf(fmt, gid);
 320                 fmt = ",%u";
 321                 if ((gr = getgrgid(gid)))
 322                         printf("(%s)", gr->gr_name);
 323                 lastgid = gid;
 324         }
 325         printf("\n");
 326         free(groups);
 327 }
 328
 329 #ifdef USE_BSM_AUDIT
 330 static void
 331 auditid(void)
 332 {
 333         auditinfo_t auditinfo;
 334         auditinfo_addr_t ainfo_addr;
 335         int ret, extended;
 336
 337         extended = 0;
 338         ret = getaudit(&auditinfo);
 339         if (ret < 0 && errno == E2BIG) {
 340                 if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
 341                         err(1, "getaudit_addr");
 342                 extended = 1;
 343         } else if (ret < 0)
 344                 err(1, "getaudit");
 345         if (extended != 0) {
 346                 (void) printf("auid=%d\n"
 347                     "mask.success=0x%08x\n"
 348                     "mask.failure=0x%08x\n"
 349                     "asid=%d\n"
 350                     "termid_addr.port=0x%08jx\n"
 351                     "termid_addr.addr[0]=0x%08x\n"
 352                     "termid_addr.addr[1]=0x%08x\n"
 353                     "termid_addr.addr[2]=0x%08x\n"
 354                     "termid_addr.addr[3]=0x%08x\n",
 355                         ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
 356                         ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
 357                         (uintmax_t)ainfo_addr.ai_termid.at_port,
 358                         ainfo_addr.ai_termid.at_addr[0],
 359                         ainfo_addr.ai_termid.at_addr[1],
 360                         ainfo_addr.ai_termid.at_addr[2],
 361                         ainfo_addr.ai_termid.at_addr[3]);
 362         } else {
 363                 (void) printf("auid=%d\n"
 364                     "mask.success=0x%08x\n"
 365                     "mask.failure=0x%08x\n"
 366                     "asid=%d\n"
 367                     "termid.port=0x%08jx\n"
 368                     "termid.machine=0x%08x\n",
 369                         auditinfo.ai_auid, auditinfo.ai_mask.am_success,
 370                         auditinfo.ai_mask.am_failure,
 371                         auditinfo.ai_asid, (uintmax_t)auditinfo.ai_termid.port,
 372                         auditinfo.ai_termid.machine);
 373         }
 374 }
 375 #endif
 376
 377 static void
 378 group(struct passwd *pw, int nflag)
 379 {
 380         struct group *gr;
 381         int cnt, id, lastid, ngroups;
 382         long ngroups_max;
 383         gid_t *groups;
 384         const char *fmt;
 385
 386         ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
 387         if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
 388                 err(1, "malloc");
 389
 390         if (pw) {
 391                 ngroups = ngroups_max;
 392                 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
 393         } else {
 394                 ngroups = getgroups(ngroups_max, groups);
 395         }
 396         fmt = nflag ? "%s" : "%u";
 397         for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
 398                 if (lastid == (id = groups[cnt]))
 399                         continue;
 400                 if (nflag) {
 401                         if ((gr = getgrgid(id)))
 402                                 (void)printf(fmt, gr->gr_name);
 403                         else
 404                                 (void)printf(*fmt == ' ' ? " %u" : "%u",
 405                                     id);
 406                         fmt = " %s";
 407                 } else {
 408                         (void)printf(fmt, id);
 409                         fmt = " %u";
 410                 }
 411                 lastid = id;
 412         }
 413         (void)printf("\n");
 414         free(groups);
 415 }
 416
 417 static void
 418 maclabel(void)
 419 {
 420         char *string;
 421         mac_t label;
 422         int error;
 423
 424         error = mac_prepare_process_label(&label);
 425         if (error == -1)
 426                 errx(1, "mac_prepare_type: %s", strerror(errno));
 427
 428         error = mac_get_proc(label);
 429         if (error == -1)
 430                 errx(1, "mac_get_proc: %s", strerror(errno));
 431
 432         error = mac_to_text(label, &string);
 433         if (error == -1)
 434                 errx(1, "mac_to_text: %s", strerror(errno));
 435
 436         (void)printf("%s\n", string);
 437         mac_free(label);
 438         free(string);
 439 }
 440
 441 static struct passwd *
 442 who(char *u)
 443 {
 444         struct passwd *pw;
 445         long id;
 446         char *ep;
 447
 448         /*
 449          * Translate user argument into a pw pointer.  First, try to
 450          * get it as specified.  If that fails, try it as a number.
 451          */
 452         if ((pw = getpwnam(u)))
 453                 return(pw);
 454         id = strtol(u, &ep, 10);
 455         if (*u && !*ep && (pw = getpwuid(id)))
 456                 return(pw);
 457         errx(1, "%s: no such user", u);
 458         /* NOTREACHED */
 459 }
 460
 461 static void
 462 pline(struct passwd *pw)
 463 {
 464
 465         if (!pw) {
 466                 if ((pw = getpwuid(getuid())) == NULL)
 467                         err(1, "getpwuid");
 468         }
 469
 470         (void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
 471                         pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 472                         (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
 473                         pw->pw_dir, pw->pw_shell);
 474 }
 475
 476
 477 static void
 478 usage(void)
 479 {
 480
 481         if (isgroups)
 482                 (void)fprintf(stderr, "usage: groups [user]\n");
 483         else if (iswhoami)
 484                 (void)fprintf(stderr, "usage: whoami\n");
 485         else
 486                 (void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
 487                     "usage: id [user]",
 488 #ifdef USE_BSM_AUDIT
 489                     "       id -A\n",
 490 #else
 491                     "",
 492 #endif
 493                     "       id -G [-n] [user]",
 494                     "       id -M",
 495                     "       id -P [user]",
 496                     "       id -c",
 497                     "       id -g [-nr] [user]",
 498                     "       id -p [user]",
 499                     "       id -u [-nr] [user]");
 500         exit(1);
 501 }