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