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