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