1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. 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 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/usr.sbin/pw/pw_group.c,v 1.16 2008/02/23 01:25:22 scf Exp $ 27 */ 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <termios.h> 32 #include <stdbool.h> 33 #include <unistd.h> 34 35 #include "pw.h" 36 #include "bitmap.h" 37 38 39 static struct passwd *lookup_pwent(const char *user); 40 static void delete_members(char ***members, int *grmembers, int *i, 41 struct carg *arg, struct group *grp); 42 static int print_group(struct group * grp, int pretty); 43 static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args); 44 45 static 46 int 47 alldigits(const char *str) 48 { 49 while (*str) { 50 if (*str < '0' || *str > '9') 51 return(0); 52 ++str; 53 } 54 return(1); 55 } 56 57 int 58 pw_group(struct userconf * cnf, int mode, struct cargs * args) 59 { 60 int rc; 61 struct carg *a_name = getarg(args, 'n'); 62 struct carg *a_gid = getarg(args, 'g'); 63 struct carg *arg; 64 struct group *grp = NULL; 65 int grmembers = 0; 66 char **members = NULL; 67 68 static struct group fakegroup = 69 { 70 "nogroup", 71 "*", 72 -1, 73 NULL 74 }; 75 76 if (mode == M_LOCK || mode == M_UNLOCK) 77 errx(EX_USAGE, "'lock' command is not available for groups"); 78 79 /* 80 * With M_NEXT, we only need to return the 81 * next gid to stdout 82 */ 83 if (mode == M_NEXT) { 84 gid_t next = gr_gidpolicy(cnf, args); 85 if (getarg(args, 'q')) 86 return next; 87 printf("%ld\n", (long)next); 88 return EXIT_SUCCESS; 89 } 90 91 if (mode == M_PRINT && getarg(args, 'a')) { 92 int pretty = getarg(args, 'P') != NULL; 93 94 SETGRENT(); 95 while ((grp = GETGRENT()) != NULL) 96 print_group(grp, pretty); 97 ENDGRENT(); 98 return EXIT_SUCCESS; 99 } 100 if (a_gid == NULL) { 101 if (a_name == NULL) 102 errx(EX_DATAERR, "group name or id required"); 103 104 if (mode != M_ADD && grp == NULL && alldigits(a_name->val)) { 105 (a_gid = a_name)->ch = 'g'; 106 a_name = NULL; 107 } 108 } 109 grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val)); 110 111 if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 112 if (a_name == NULL && grp == NULL) /* Try harder */ 113 grp = GETGRGID(atoi(a_gid->val)); 114 115 if (grp == NULL) { 116 if (mode == M_PRINT && getarg(args, 'F')) { 117 char *fmems[1]; 118 fmems[0] = NULL; 119 fakegroup.gr_name = a_name ? a_name->val : "nogroup"; 120 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1; 121 fakegroup.gr_mem = fmems; 122 return print_group(&fakegroup, getarg(args, 'P') != NULL); 123 } 124 errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val); 125 } 126 if (a_name == NULL) /* Needed later */ 127 a_name = addarg(args, 'n', grp->gr_name); 128 129 /* 130 * Handle deletions now 131 */ 132 if (mode == M_DELETE) { 133 gid_t gid = grp->gr_gid; 134 135 rc = delgrent(grp); 136 if (rc == -1) 137 err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name); 138 else if (rc != 0) { 139 warn("group update"); 140 return EX_IOERR; 141 } 142 pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid); 143 return EXIT_SUCCESS; 144 } else if (mode == M_PRINT) 145 return print_group(grp, getarg(args, 'P') != NULL); 146 147 if (a_gid) 148 grp->gr_gid = (gid_t) atoi(a_gid->val); 149 150 if ((arg = getarg(args, 'l')) != NULL) 151 grp->gr_name = pw_checkname((u_char *)arg->val, 0); 152 } else { 153 if (a_name == NULL) /* Required */ 154 errx(EX_DATAERR, "group name required"); 155 else if (grp != NULL) /* Exists */ 156 errx(EX_DATAERR, "group name `%s' already exists", a_name->val); 157 158 extendarray(&members, &grmembers, 200); 159 members[0] = NULL; 160 grp = &fakegroup; 161 grp->gr_name = pw_checkname((u_char *)a_name->val, 0); 162 grp->gr_passwd = "*"; 163 grp->gr_gid = gr_gidpolicy(cnf, args); 164 grp->gr_mem = members; 165 } 166 167 /* 168 * This allows us to set a group password Group passwords is an 169 * antique idea, rarely used and insecure (no secure database) Should 170 * be discouraged, but it is apparently still supported by some 171 * software. 172 */ 173 174 if ((arg = getarg(args, 'h')) != NULL || 175 (arg = getarg(args, 'H')) != NULL) { 176 if (strcmp(arg->val, "-") == 0) 177 grp->gr_passwd = "*"; /* No access */ 178 else { 179 int fd = atoi(arg->val); 180 int precrypt = (arg->ch == 'H'); 181 int b; 182 int istty = isatty(fd); 183 struct termios t; 184 char *p, line[256]; 185 186 if (istty) { 187 if (tcgetattr(fd, &t) == -1) 188 istty = 0; 189 else { 190 struct termios n = t; 191 192 /* Disable echo */ 193 n.c_lflag &= ~(ECHO); 194 tcsetattr(fd, TCSANOW, &n); 195 printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); 196 fflush(stdout); 197 } 198 } 199 b = read(fd, line, sizeof(line) - 1); 200 if (istty) { /* Restore state */ 201 tcsetattr(fd, TCSANOW, &t); 202 fputc('\n', stdout); 203 fflush(stdout); 204 } 205 if (b < 0) { 206 warn("-h file descriptor"); 207 return EX_OSERR; 208 } 209 line[b] = '\0'; 210 if ((p = strpbrk(line, " \t\r\n")) != NULL) 211 *p = '\0'; 212 if (!*line) 213 errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 214 if (precrypt) { 215 if (strchr(line, ':') != NULL) 216 return EX_DATAERR; 217 grp->gr_passwd = line; 218 } else 219 grp->gr_passwd = pw_pwcrypt(line); 220 } 221 } 222 223 if (((arg = getarg(args, 'M')) != NULL || 224 (arg = getarg(args, 'd')) != NULL || 225 (arg = getarg(args, 'm')) != NULL) && arg->val) { 226 int i = 0; 227 char *p; 228 struct passwd *pwd; 229 230 /* Make sure this is not stay NULL with -M "" */ 231 extendarray(&members, &grmembers, 200); 232 if (arg->ch == 'd') 233 delete_members(&members, &grmembers, &i, arg, grp); 234 else if (arg->ch == 'm') { 235 int k = 0; 236 237 while (grp->gr_mem[k] != NULL) { 238 if (extendarray(&members, &grmembers, i + 2) != -1) 239 members[i++] = grp->gr_mem[k]; 240 k++; 241 } 242 } 243 244 if (arg->ch != 'd') 245 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 246 int j; 247 248 /* 249 * Check for duplicates 250 */ 251 pwd = lookup_pwent(p); 252 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++) 253 ; 254 if (j == i && extendarray(&members, &grmembers, i + 2) != -1) 255 members[i++] = newstr(pwd->pw_name); 256 } 257 while (i < grmembers) 258 members[i++] = NULL; 259 grp->gr_mem = members; 260 } 261 262 if (getarg(args, 'N') != NULL) 263 return print_group(grp, getarg(args, 'P') != NULL); 264 265 if (mode == M_ADD && (rc = addgrent(grp)) != 0) { 266 if (rc == -1) 267 warnx("group '%s' already exists", grp->gr_name); 268 else 269 warn("group update"); 270 return EX_IOERR; 271 } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) { 272 if (rc == -1) 273 warnx("group '%s' not available (NIS?)", grp->gr_name); 274 else 275 warn("group update"); 276 return EX_IOERR; 277 } 278 /* grp may have been invalidated */ 279 if ((grp = GETGRNAM(a_name->val)) == NULL) 280 errx(EX_SOFTWARE, "group disappeared during update"); 281 282 pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid); 283 284 if (members) 285 free(members); 286 287 return EXIT_SUCCESS; 288 } 289 290 291 /* 292 * Lookup a passwd entry using a name or UID. 293 */ 294 static struct passwd * 295 lookup_pwent(const char *user) 296 { 297 struct passwd *pwd; 298 299 if ((pwd = GETPWNAM(user)) == NULL && 300 (!isdigit((unsigned char)*user) || 301 (pwd = getpwuid((uid_t) atoi(user))) == NULL)) 302 errx(EX_NOUSER, "user `%s' does not exist", user); 303 304 return (pwd); 305 } 306 307 308 /* 309 * Delete requested members from a group. 310 */ 311 static void 312 delete_members(char ***members, int *grmembers, int *i, struct carg *arg, 313 struct group *grp) 314 { 315 bool matchFound; 316 char *user; 317 char *valueCopy; 318 char *valuePtr; 319 int k; 320 struct passwd *pwd; 321 322 k = 0; 323 while (grp->gr_mem[k] != NULL) { 324 matchFound = false; 325 if ((valueCopy = strdup(arg->val)) == NULL) 326 errx(EX_UNAVAILABLE, "out of memory"); 327 valuePtr = valueCopy; 328 while ((user = strsep(&valuePtr, ", \t")) != NULL) { 329 pwd = lookup_pwent(user); 330 if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) { 331 matchFound = true; 332 break; 333 } 334 } 335 free(valueCopy); 336 337 if (!matchFound && 338 extendarray(members, grmembers, *i + 2) != -1) 339 (*members)[(*i)++] = grp->gr_mem[k]; 340 341 k++; 342 } 343 344 return; 345 } 346 347 348 static gid_t 349 gr_gidpolicy(struct userconf * cnf, struct cargs * args) 350 { 351 struct group *grp; 352 gid_t gid = (gid_t) - 1; 353 struct carg *a_gid = getarg(args, 'g'); 354 355 /* 356 * Check the given gid, if any 357 */ 358 if (a_gid != NULL) { 359 gid = (gid_t) atol(a_gid->val); 360 361 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL) 362 errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid); 363 } else { 364 struct bitmap bm; 365 366 /* 367 * We need to allocate the next available gid under one of 368 * two policies a) Grab the first unused gid b) Grab the 369 * highest possible unused gid 370 */ 371 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 372 cnf->min_gid = 1000; 373 cnf->max_gid = 32000; 374 } 375 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 376 377 /* 378 * Now, let's fill the bitmap from the password file 379 */ 380 SETGRENT(); 381 while ((grp = GETGRENT()) != NULL) 382 if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && 383 (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) 384 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 385 ENDGRENT(); 386 387 /* 388 * Then apply the policy, with fallback to reuse if necessary 389 */ 390 if (cnf->reuse_gids) 391 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 392 else { 393 gid = (gid_t) (bm_lastset(&bm) + 1); 394 if (!bm_isset(&bm, gid)) 395 gid += cnf->min_gid; 396 else 397 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 398 } 399 400 /* 401 * Another sanity check 402 */ 403 if (gid < cnf->min_gid || gid > cnf->max_gid) 404 errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used"); 405 bm_dealloc(&bm); 406 } 407 return gid; 408 } 409 410 411 static int 412 print_group(struct group * grp, int pretty) 413 { 414 if (!pretty) { 415 int buflen = 0; 416 char *buf = NULL; 417 418 fmtgrent(&buf, &buflen, grp); 419 fputs(buf, stdout); 420 free(buf); 421 } else { 422 int i; 423 424 printf("Group Name: %-15s #%lu\n" 425 " Members: ", 426 grp->gr_name, (long) grp->gr_gid); 427 for (i = 0; grp->gr_mem[i]; i++) 428 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 429 fputs("\n\n", stdout); 430 } 431 return EXIT_SUCCESS; 432 } 433