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 #include <err.h> 52 #include <errno.h> 53 #include <grp.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 void current(void); 61 void pline(struct passwd *); 62 void pretty(struct passwd *); 63 void group(struct passwd *, int); 64 void maclabel(void); 65 void usage(void); 66 void user(struct passwd *); 67 struct passwd * 68 who(char *); 69 70 int isgroups, iswhoami; 71 72 int 73 main(int argc, char *argv[]) 74 { 75 struct group *gr; 76 struct passwd *pw; 77 int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag; 78 const char *myname; 79 80 Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0; 81 82 myname = strrchr(argv[0], '/'); 83 myname = (myname != NULL) ? myname + 1 : argv[0]; 84 if (strcmp(myname, "groups") == 0) { 85 isgroups = 1; 86 Gflag = nflag = 1; 87 } 88 else if (strcmp(myname, "whoami") == 0) { 89 iswhoami = 1; 90 uflag = nflag = 1; 91 } 92 93 while ((ch = getopt(argc, argv, 94 (isgroups || iswhoami) ? "" : "PGMgnpru")) != -1) 95 switch(ch) { 96 case 'G': 97 Gflag = 1; 98 break; 99 case 'M': 100 Mflag = 1; 101 break; 102 case 'P': 103 Pflag = 1; 104 break; 105 case 'g': 106 gflag = 1; 107 break; 108 case 'n': 109 nflag = 1; 110 break; 111 case 'p': 112 pflag = 1; 113 break; 114 case 'r': 115 rflag = 1; 116 break; 117 case 'u': 118 uflag = 1; 119 break; 120 case '?': 121 default: 122 usage(); 123 } 124 argc -= optind; 125 argv += optind; 126 127 if (iswhoami && argc > 0) 128 usage(); 129 130 switch(Gflag + Pflag + gflag + pflag + uflag) { 131 case 1: 132 break; 133 case 0: 134 if (!nflag && !rflag) 135 break; 136 /* FALLTHROUGH */ 137 default: 138 usage(); 139 } 140 141 pw = *argv ? who(*argv) : NULL; 142 143 if (Mflag && pw != NULL) 144 usage(); 145 146 if (gflag) { 147 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 148 if (nflag && (gr = getgrgid(id))) 149 (void)printf("%s\n", gr->gr_name); 150 else 151 (void)printf("%u\n", id); 152 exit(0); 153 } 154 155 if (uflag) { 156 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 157 if (nflag && (pw = getpwuid(id))) 158 (void)printf("%s\n", pw->pw_name); 159 else 160 (void)printf("%u\n", id); 161 exit(0); 162 } 163 164 if (Gflag) { 165 group(pw, nflag); 166 exit(0); 167 } 168 169 if (Mflag) { 170 maclabel(); 171 exit(0); 172 } 173 174 if (Pflag) { 175 pline(pw); 176 exit(0); 177 } 178 179 if (pflag) { 180 pretty(pw); 181 exit(0); 182 } 183 184 if (pw) 185 user(pw); 186 else 187 current(); 188 exit(0); 189 } 190 191 void 192 pretty(struct passwd *pw) 193 { 194 struct group *gr; 195 u_int eid, rid; 196 char *login; 197 198 if (pw) { 199 (void)printf("uid\t%s\n", pw->pw_name); 200 (void)printf("groups\t"); 201 group(pw, 1); 202 } else { 203 if ((login = getlogin()) == NULL) 204 err(1, "getlogin"); 205 206 pw = getpwuid(rid = getuid()); 207 if (pw == NULL || strcmp(login, pw->pw_name)) 208 (void)printf("login\t%s\n", login); 209 if (pw) 210 (void)printf("uid\t%s\n", pw->pw_name); 211 else 212 (void)printf("uid\t%u\n", rid); 213 214 if ((eid = geteuid()) != rid) { 215 if ((pw = getpwuid(eid))) 216 (void)printf("euid\t%s\n", pw->pw_name); 217 else 218 (void)printf("euid\t%u\n", eid); 219 } 220 if ((rid = getgid()) != (eid = getegid())) { 221 if ((gr = getgrgid(rid))) 222 (void)printf("rgid\t%s\n", gr->gr_name); 223 else 224 (void)printf("rgid\t%u\n", rid); 225 } 226 (void)printf("groups\t"); 227 group(NULL, 1); 228 } 229 } 230 231 void 232 current(void) 233 { 234 struct group *gr; 235 struct passwd *pw; 236 int cnt, id, eid, lastid, ngroups; 237 gid_t groups[NGROUPS]; 238 const char *fmt; 239 240 id = getuid(); 241 (void)printf("uid=%u", id); 242 if ((pw = getpwuid(id))) 243 (void)printf("(%s)", pw->pw_name); 244 if ((eid = geteuid()) != id) { 245 (void)printf(" euid=%u", eid); 246 if ((pw = getpwuid(eid))) 247 (void)printf("(%s)", pw->pw_name); 248 } 249 id = getgid(); 250 (void)printf(" gid=%u", id); 251 if ((gr = getgrgid(id))) 252 (void)printf("(%s)", gr->gr_name); 253 if ((eid = getegid()) != id) { 254 (void)printf(" egid=%u", eid); 255 if ((gr = getgrgid(eid))) 256 (void)printf("(%s)", gr->gr_name); 257 } 258 if ((ngroups = getgroups(NGROUPS, groups))) { 259 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 260 fmt = ", %u", lastid = id) { 261 id = groups[cnt++]; 262 if (lastid == id) 263 continue; 264 (void)printf(fmt, id); 265 if ((gr = getgrgid(id))) 266 (void)printf("(%s)", gr->gr_name); 267 } 268 } 269 (void)printf("\n"); 270 } 271 272 void 273 user(struct passwd *pw) 274 { 275 struct group *gr; 276 const char *fmt; 277 int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1]; 278 279 (void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name); 280 gid = pw->pw_gid; 281 (void)printf(" gid=%u", gid); 282 if ((gr = getgrgid(gid))) 283 (void)printf("(%s)", gr->gr_name); 284 ngroups = NGROUPS + 1; 285 (void) getgrouplist(pw->pw_name, gid, groups, &ngroups); 286 fmt = " groups=%u"; 287 for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) { 288 if (lastgid == (gid = groups[cnt])) 289 continue; 290 (void)printf(fmt, gid); 291 fmt = ", %u"; 292 if ((gr = getgrgid(gid))) 293 (void)printf("(%s)", gr->gr_name); 294 lastgid = gid; 295 } 296 (void)printf("\n"); 297 } 298 299 void 300 group(struct passwd *pw, int nflag) 301 { 302 struct group *gr; 303 int cnt, id, lastid, ngroups; 304 gid_t groups[NGROUPS + 1]; 305 const char *fmt; 306 307 if (pw) { 308 ngroups = NGROUPS + 1; 309 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 310 } else { 311 groups[0] = getgid(); 312 ngroups = getgroups(NGROUPS, groups + 1) + 1; 313 } 314 fmt = nflag ? "%s" : "%u"; 315 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 316 if (lastid == (id = groups[cnt])) 317 continue; 318 if (nflag) { 319 if ((gr = getgrgid(id))) 320 (void)printf(fmt, gr->gr_name); 321 else 322 (void)printf(*fmt == ' ' ? " %u" : "%u", 323 id); 324 fmt = " %s"; 325 } else { 326 (void)printf(fmt, id); 327 fmt = " %u"; 328 } 329 lastid = id; 330 } 331 (void)printf("\n"); 332 } 333 334 void 335 maclabel(void) 336 { 337 char *string; 338 mac_t label; 339 int error; 340 341 error = mac_prepare_process_label(&label); 342 if (error == -1) 343 errx(1, "mac_prepare_type: %s", strerror(errno)); 344 345 error = mac_get_proc(label); 346 if (error == -1) 347 errx(1, "mac_get_proc: %s", strerror(errno)); 348 349 error = mac_to_text(label, &string); 350 if (error == -1) 351 errx(1, "mac_to_text: %s", strerror(errno)); 352 353 (void)printf("%s\n", string); 354 mac_free(label); 355 free(string); 356 } 357 358 struct passwd * 359 who(char *u) 360 { 361 struct passwd *pw; 362 long id; 363 char *ep; 364 365 /* 366 * Translate user argument into a pw pointer. First, try to 367 * get it as specified. If that fails, try it as a number. 368 */ 369 if ((pw = getpwnam(u))) 370 return(pw); 371 id = strtol(u, &ep, 10); 372 if (*u && !*ep && (pw = getpwuid(id))) 373 return(pw); 374 errx(1, "%s: no such user", u); 375 /* NOTREACHED */ 376 } 377 378 void 379 pline(struct passwd *pw) 380 { 381 u_int rid; 382 383 if (!pw) { 384 if ((pw = getpwuid(rid = getuid())) == NULL) 385 err(1, "getpwuid"); 386 } 387 388 (void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name, 389 pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 390 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, 391 pw->pw_dir, pw->pw_shell); 392 } 393 394 395 void 396 usage(void) 397 { 398 399 if (isgroups) 400 (void)fprintf(stderr, "usage: groups [user]\n"); 401 else if (iswhoami) 402 (void)fprintf(stderr, "usage: whoami\n"); 403 else 404 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 405 "usage: id [user]", 406 " id -G [-n] [user]", 407 " id -M", 408 " id -P [user]", 409 " id -g [-nr] [user]", 410 " id -p [user]", 411 " id -u [-nr] [user]"); 412 exit(1); 413 } 414