pw_group.c revision 285395
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 28static const char rcsid[] = 29 "$FreeBSD: head/usr.sbin/pw/pw_group.c 285395 2015-07-11 16:58:47Z bapt $"; 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 44static struct passwd *lookup_pwent(const char *user); 45static void delete_members(char ***members, int *grmembers, int *i, 46 struct carg *arg, struct group *grp); 47static int print_group(struct group * grp); 48static gid_t gr_gidpolicy(struct userconf * cnf, long id); 49 50static void 51set_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 94int 95pw_groupnext(struct userconf *cnf, bool quiet) 96{ 97 gid_t next = gr_gidpolicy(cnf, -1); 98 99 if (quiet) 100 return (next); 101 printf("%u\n", next); 102 103 return (EXIT_SUCCESS); 104} 105 106int 107pw_group(int mode, char *name, long id, struct cargs * args) 108{ 109 int rc; 110 struct carg *arg; 111 struct group *grp = NULL; 112 int grmembers = 0; 113 char **members = NULL; 114 struct userconf *cnf = conf.userconf; 115 116 static struct group fakegroup = 117 { 118 "nogroup", 119 "*", 120 -1, 121 NULL 122 }; 123 124 if (mode == M_NEXT) 125 return (pw_groupnext(cnf, getarg(args, 'q') != NULL)); 126 127 if (mode == M_LOCK || mode == M_UNLOCK) 128 errx(EX_USAGE, "'lock' command is not available for groups"); 129 130 if (mode == M_PRINT && getarg(args, 'a')) { 131 SETGRENT(); 132 while ((grp = GETGRENT()) != NULL) 133 print_group(grp); 134 ENDGRENT(); 135 return EXIT_SUCCESS; 136 } 137 if (id < 0 && name == NULL) 138 errx(EX_DATAERR, "group name or id required"); 139 140 grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id); 141 142 if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 143 if (name == NULL && grp == NULL) /* Try harder */ 144 grp = GETGRGID(id); 145 146 if (grp == NULL) { 147 if (mode == M_PRINT && getarg(args, 'F')) { 148 char *fmems[1]; 149 fmems[0] = NULL; 150 fakegroup.gr_name = name ? name : "nogroup"; 151 fakegroup.gr_gid = (gid_t) id; 152 fakegroup.gr_mem = fmems; 153 return print_group(&fakegroup); 154 } 155 if (name == NULL) 156 errx(EX_DATAERR, "unknown group `%s'", name); 157 else 158 errx(EX_DATAERR, "unknown group `%ld'", id); 159 } 160 if (name == NULL) /* Needed later */ 161 name = grp->gr_name; 162 163 /* 164 * Handle deletions now 165 */ 166 if (mode == M_DELETE) { 167 rc = delgrent(grp); 168 if (rc == -1) 169 err(EX_IOERR, "group '%s' not available (NIS?)", 170 name); 171 else if (rc != 0) { 172 err(EX_IOERR, "group update"); 173 } 174 pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id); 175 return EXIT_SUCCESS; 176 } else if (mode == M_PRINT) 177 return print_group(grp); 178 179 if (id > 0) 180 grp->gr_gid = (gid_t) id; 181 182 if (conf.newname != NULL) 183 grp->gr_name = pw_checkname(conf.newname, 0); 184 } else { 185 if (name == NULL) /* Required */ 186 errx(EX_DATAERR, "group name required"); 187 else if (grp != NULL) /* Exists */ 188 errx(EX_DATAERR, "group name `%s' already exists", name); 189 190 extendarray(&members, &grmembers, 200); 191 members[0] = NULL; 192 grp = &fakegroup; 193 grp->gr_name = pw_checkname(name, 0); 194 grp->gr_passwd = "*"; 195 grp->gr_gid = gr_gidpolicy(cnf, id); 196 grp->gr_mem = members; 197 } 198 199 /* 200 * This allows us to set a group password Group passwords is an 201 * antique idea, rarely used and insecure (no secure database) Should 202 * be discouraged, but it is apparently still supported by some 203 * software. 204 */ 205 206 if (conf.which == W_GROUP && conf.fd != -1) 207 set_passwd(grp, mode == M_UPDATE); 208 209 if (((arg = getarg(args, 'M')) != NULL || 210 (arg = getarg(args, 'd')) != NULL || 211 (arg = getarg(args, 'm')) != NULL) && arg->val) { 212 int i = 0; 213 char *p; 214 struct passwd *pwd; 215 216 /* Make sure this is not stay NULL with -M "" */ 217 extendarray(&members, &grmembers, 200); 218 if (arg->ch == 'd') 219 delete_members(&members, &grmembers, &i, arg, grp); 220 else if (arg->ch == 'm') { 221 int k = 0; 222 223 if (grp->gr_mem != NULL) { 224 while (grp->gr_mem[k] != NULL) { 225 if (extendarray(&members, &grmembers, i + 2) != -1) 226 members[i++] = grp->gr_mem[k]; 227 k++; 228 } 229 } 230 } 231 232 if (arg->ch != 'd') 233 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 234 int j; 235 236 /* 237 * Check for duplicates 238 */ 239 pwd = lookup_pwent(p); 240 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++) 241 ; 242 if (j == i && extendarray(&members, &grmembers, i + 2) != -1) 243 members[i++] = newstr(pwd->pw_name); 244 } 245 while (i < grmembers) 246 members[i++] = NULL; 247 grp->gr_mem = members; 248 } 249 250 if (conf.dryrun) 251 return print_group(grp); 252 253 if (mode == M_ADD && (rc = addgrent(grp)) != 0) { 254 if (rc == -1) 255 errx(EX_IOERR, "group '%s' already exists", 256 grp->gr_name); 257 else 258 err(EX_IOERR, "group update"); 259 } else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) { 260 if (rc == -1) 261 errx(EX_IOERR, "group '%s' not available (NIS?)", 262 grp->gr_name); 263 else 264 err(EX_IOERR, "group update"); 265 } 266 267 if (conf.newname != NULL) 268 name = conf.newname; 269 /* grp may have been invalidated */ 270 if ((grp = GETGRNAM(name)) == NULL) 271 errx(EX_SOFTWARE, "group disappeared during update"); 272 273 pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid); 274 275 free(members); 276 277 return EXIT_SUCCESS; 278} 279 280 281/* 282 * Lookup a passwd entry using a name or UID. 283 */ 284static struct passwd * 285lookup_pwent(const char *user) 286{ 287 struct passwd *pwd; 288 289 if ((pwd = GETPWNAM(user)) == NULL && 290 (!isdigit((unsigned char)*user) || 291 (pwd = getpwuid((uid_t) atoi(user))) == NULL)) 292 errx(EX_NOUSER, "user `%s' does not exist", user); 293 294 return (pwd); 295} 296 297 298/* 299 * Delete requested members from a group. 300 */ 301static void 302delete_members(char ***members, int *grmembers, int *i, struct carg *arg, 303 struct group *grp) 304{ 305 bool matchFound; 306 char *user; 307 char *valueCopy; 308 char *valuePtr; 309 int k; 310 struct passwd *pwd; 311 312 if (grp->gr_mem == NULL) 313 return; 314 315 k = 0; 316 while (grp->gr_mem[k] != NULL) { 317 matchFound = false; 318 if ((valueCopy = strdup(arg->val)) == NULL) 319 errx(EX_UNAVAILABLE, "out of memory"); 320 valuePtr = valueCopy; 321 while ((user = strsep(&valuePtr, ", \t")) != NULL) { 322 pwd = lookup_pwent(user); 323 if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) { 324 matchFound = true; 325 break; 326 } 327 } 328 free(valueCopy); 329 330 if (!matchFound && 331 extendarray(members, grmembers, *i + 2) != -1) 332 (*members)[(*i)++] = grp->gr_mem[k]; 333 334 k++; 335 } 336 337 return; 338} 339 340 341static gid_t 342gr_gidpolicy(struct userconf * cnf, long id) 343{ 344 struct group *grp; 345 gid_t gid = (gid_t) - 1; 346 347 /* 348 * Check the given gid, if any 349 */ 350 if (id > 0) { 351 gid = (gid_t) id; 352 353 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate) 354 errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid); 355 } else { 356 struct bitmap bm; 357 358 /* 359 * We need to allocate the next available gid under one of 360 * two policies a) Grab the first unused gid b) Grab the 361 * highest possible unused gid 362 */ 363 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 364 cnf->min_gid = 1000; 365 cnf->max_gid = 32000; 366 } 367 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 368 369 /* 370 * Now, let's fill the bitmap from the password file 371 */ 372 SETGRENT(); 373 while ((grp = GETGRENT()) != NULL) 374 if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && 375 (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) 376 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 377 ENDGRENT(); 378 379 /* 380 * Then apply the policy, with fallback to reuse if necessary 381 */ 382 if (cnf->reuse_gids) 383 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 384 else { 385 gid = (gid_t) (bm_lastset(&bm) + 1); 386 if (!bm_isset(&bm, gid)) 387 gid += cnf->min_gid; 388 else 389 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 390 } 391 392 /* 393 * Another sanity check 394 */ 395 if (gid < cnf->min_gid || gid > cnf->max_gid) 396 errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used"); 397 bm_dealloc(&bm); 398 } 399 return gid; 400} 401 402 403static int 404print_group(struct group * grp) 405{ 406 if (!conf.pretty) { 407 char *buf = NULL; 408 409 buf = gr_make(grp); 410 printf("%s\n", buf); 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 if (grp->gr_mem != NULL) { 419 for (i = 0; grp->gr_mem[i]; i++) 420 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 421 } 422 fputs("\n\n", stdout); 423 } 424 return EXIT_SUCCESS; 425} 426