pw_group.c revision 243894
1210284Sjmallett/*- 2232812Sjmallett * Copyright (C) 1996 3215990Sjmallett * David L. Nugent. All rights reserved. 4210284Sjmallett * 5210284Sjmallett * Redistribution and use in source and binary forms, with or without 6215990Sjmallett * modification, are permitted provided that the following conditions 7215990Sjmallett * are met: 8215990Sjmallett * 1. Redistributions of source code must retain the above copyright 9210284Sjmallett * notice, this list of conditions and the following disclaimer. 10215990Sjmallett * 2. Redistributions in binary form must reproduce the above copyright 11215990Sjmallett * notice, this list of conditions and the following disclaimer in the 12210284Sjmallett * documentation and/or other materials provided with the distribution. 13215990Sjmallett * 14215990Sjmallett * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15215990Sjmallett * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16215990Sjmallett * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17215990Sjmallett * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18232812Sjmallett * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19215990Sjmallett * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20215990Sjmallett * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21215990Sjmallett * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22215990Sjmallett * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23215990Sjmallett * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24215990Sjmallett * SUCH DAMAGE. 25215990Sjmallett */ 26215990Sjmallett 27215990Sjmallett#ifndef lint 28215990Sjmallettstatic const char rcsid[] = 29232812Sjmallett "$FreeBSD: head/usr.sbin/pw/pw_group.c 243894 2012-12-05 13:56:43Z eadler $"; 30215990Sjmallett#endif /* not lint */ 31215990Sjmallett 32215990Sjmallett#include <ctype.h> 33215990Sjmallett#include <err.h> 34215990Sjmallett#include <termios.h> 35215990Sjmallett#include <stdbool.h> 36215990Sjmallett#include <unistd.h> 37215990Sjmallett#include <grp.h> 38210284Sjmallett#include <libutil.h> 39210284Sjmallett 40210284Sjmallett#include "pw.h" 41215990Sjmallett#include "bitmap.h" 42210284Sjmallett 43210284Sjmallett 44210284Sjmallettstatic struct passwd *lookup_pwent(const char *user); 45210284Sjmallettstatic void delete_members(char ***members, int *grmembers, int *i, 46210284Sjmallett struct carg *arg, struct group *grp); 47210284Sjmallettstatic int print_group(struct group * grp, int pretty); 48210284Sjmallettstatic gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args); 49210284Sjmallett 50210284Sjmallettint 51210284Sjmallettpw_group(struct userconf * cnf, int mode, struct cargs * args) 52210284Sjmallett{ 53210284Sjmallett int rc; 54215990Sjmallett struct carg *a_name = getarg(args, 'n'); 55215990Sjmallett struct carg *a_gid = getarg(args, 'g'); 56210284Sjmallett struct carg *arg; 57210284Sjmallett struct group *grp = NULL; 58210284Sjmallett int grmembers = 0; 59210284Sjmallett char **members = NULL; 60210284Sjmallett 61210284Sjmallett static struct group fakegroup = 62215990Sjmallett { 63215990Sjmallett "nogroup", 64210284Sjmallett "*", 65210284Sjmallett -1, 66210284Sjmallett NULL 67215990Sjmallett }; 68210284Sjmallett 69210284Sjmallett if (mode == M_LOCK || mode == M_UNLOCK) 70210284Sjmallett errx(EX_USAGE, "'lock' command is not available for groups"); 71210284Sjmallett 72210284Sjmallett /* 73210284Sjmallett * With M_NEXT, we only need to return the 74210284Sjmallett * next gid to stdout 75210284Sjmallett */ 76210284Sjmallett if (mode == M_NEXT) { 77210284Sjmallett gid_t next = gr_gidpolicy(cnf, args); 78210284Sjmallett if (getarg(args, 'q')) 79210284Sjmallett return next; 80210284Sjmallett printf("%ld\n", (long)next); 81210284Sjmallett return EXIT_SUCCESS; 82210284Sjmallett } 83210284Sjmallett 84210284Sjmallett if (mode == M_PRINT && getarg(args, 'a')) { 85210284Sjmallett int pretty = getarg(args, 'P') != NULL; 86210284Sjmallett 87210284Sjmallett SETGRENT(); 88210284Sjmallett while ((grp = GETGRENT()) != NULL) 89210284Sjmallett print_group(grp, pretty); 90210284Sjmallett ENDGRENT(); 91215990Sjmallett return EXIT_SUCCESS; 92210284Sjmallett } 93210284Sjmallett if (a_gid == NULL) { 94210284Sjmallett if (a_name == NULL) 95210284Sjmallett errx(EX_DATAERR, "group name or id required"); 96210284Sjmallett 97210284Sjmallett if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) { 98210284Sjmallett (a_gid = a_name)->ch = 'g'; 99210284Sjmallett a_name = NULL; 100210284Sjmallett } 101210284Sjmallett } 102210284Sjmallett grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val)); 103210284Sjmallett 104210284Sjmallett if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 105210284Sjmallett if (a_name == NULL && grp == NULL) /* Try harder */ 106210284Sjmallett grp = GETGRGID(atoi(a_gid->val)); 107210284Sjmallett 108210284Sjmallett if (grp == NULL) { 109210284Sjmallett if (mode == M_PRINT && getarg(args, 'F')) { 110210284Sjmallett char *fmems[1]; 111210284Sjmallett fmems[0] = NULL; 112210284Sjmallett fakegroup.gr_name = a_name ? a_name->val : "nogroup"; 113210284Sjmallett fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1; 114210284Sjmallett fakegroup.gr_mem = fmems; 115210284Sjmallett return print_group(&fakegroup, getarg(args, 'P') != NULL); 116210284Sjmallett } 117210284Sjmallett errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val); 118210284Sjmallett } 119210284Sjmallett if (a_name == NULL) /* Needed later */ 120210284Sjmallett a_name = addarg(args, 'n', grp->gr_name); 121210284Sjmallett 122210284Sjmallett /* 123210284Sjmallett * Handle deletions now 124210284Sjmallett */ 125210284Sjmallett if (mode == M_DELETE) { 126210284Sjmallett gid_t gid = grp->gr_gid; 127210284Sjmallett 128210284Sjmallett rc = delgrent(grp); 129210284Sjmallett if (rc == -1) 130210284Sjmallett err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name); 131210284Sjmallett else if (rc != 0) { 132210284Sjmallett warn("group update"); 133210284Sjmallett return EX_IOERR; 134210284Sjmallett } 135210284Sjmallett pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid); 136210284Sjmallett return EXIT_SUCCESS; 137210284Sjmallett } else if (mode == M_PRINT) 138210284Sjmallett return print_group(grp, getarg(args, 'P') != NULL); 139210284Sjmallett 140210284Sjmallett if (a_gid) 141210284Sjmallett grp->gr_gid = (gid_t) atoi(a_gid->val); 142210284Sjmallett 143210284Sjmallett if ((arg = getarg(args, 'l')) != NULL) 144210284Sjmallett grp->gr_name = pw_checkname((u_char *)arg->val, 0); 145210284Sjmallett } else { 146210284Sjmallett if (a_name == NULL) /* Required */ 147210284Sjmallett errx(EX_DATAERR, "group name required"); 148210284Sjmallett else if (grp != NULL) /* Exists */ 149210284Sjmallett errx(EX_DATAERR, "group name `%s' already exists", a_name->val); 150210284Sjmallett 151215990Sjmallett extendarray(&members, &grmembers, 200); 152210284Sjmallett members[0] = NULL; 153210284Sjmallett grp = &fakegroup; 154215990Sjmallett grp->gr_name = pw_checkname((u_char *)a_name->val, 0); 155210284Sjmallett grp->gr_passwd = "*"; 156210284Sjmallett grp->gr_gid = gr_gidpolicy(cnf, args); 157210284Sjmallett grp->gr_mem = members; 158215990Sjmallett } 159210284Sjmallett 160215990Sjmallett /* 161210284Sjmallett * This allows us to set a group password Group passwords is an 162210284Sjmallett * antique idea, rarely used and insecure (no secure database) Should 163210284Sjmallett * be discouraged, but it is apparently still supported by some 164210284Sjmallett * software. 165210284Sjmallett */ 166215990Sjmallett 167210284Sjmallett if ((arg = getarg(args, 'h')) != NULL || 168210284Sjmallett (arg = getarg(args, 'H')) != NULL) { 169215990Sjmallett if (strcmp(arg->val, "-") == 0) 170210284Sjmallett grp->gr_passwd = "*"; /* No access */ 171210284Sjmallett else { 172210284Sjmallett int fd = atoi(arg->val); 173215990Sjmallett int precrypt = (arg->ch == 'H'); 174210284Sjmallett int b; 175215990Sjmallett int istty = isatty(fd); 176210284Sjmallett struct termios t; 177210284Sjmallett char *p, line[256]; 178210284Sjmallett 179210284Sjmallett if (istty) { 180210284Sjmallett if (tcgetattr(fd, &t) == -1) 181210284Sjmallett istty = 0; 182210284Sjmallett else { 183210284Sjmallett struct termios n = t; 184210284Sjmallett 185210284Sjmallett /* Disable echo */ 186210284Sjmallett n.c_lflag &= ~(ECHO); 187210284Sjmallett tcsetattr(fd, TCSANOW, &n); 188210284Sjmallett printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); 189210284Sjmallett fflush(stdout); 190210284Sjmallett } 191210284Sjmallett } 192210284Sjmallett b = read(fd, line, sizeof(line) - 1); 193210284Sjmallett if (istty) { /* Restore state */ 194210284Sjmallett tcsetattr(fd, TCSANOW, &t); 195215990Sjmallett fputc('\n', stdout); 196210284Sjmallett fflush(stdout); 197215990Sjmallett } 198210284Sjmallett if (b < 0) { 199215990Sjmallett warn("-h file descriptor"); 200210284Sjmallett return EX_OSERR; 201210284Sjmallett } 202210284Sjmallett line[b] = '\0'; 203210284Sjmallett if ((p = strpbrk(line, " \t\r\n")) != NULL) 204210284Sjmallett *p = '\0'; 205210284Sjmallett if (!*line) 206210284Sjmallett errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 207210284Sjmallett if (precrypt) { 208210284Sjmallett if (strchr(line, ':') != NULL) 209210284Sjmallett return EX_DATAERR; 210210284Sjmallett grp->gr_passwd = line; 211215990Sjmallett } else 212210284Sjmallett grp->gr_passwd = pw_pwcrypt(line); 213215990Sjmallett } 214210284Sjmallett } 215210284Sjmallett 216215990Sjmallett if (((arg = getarg(args, 'M')) != NULL || 217210284Sjmallett (arg = getarg(args, 'd')) != NULL || 218215990Sjmallett (arg = getarg(args, 'm')) != NULL) && arg->val) { 219215990Sjmallett int i = 0; 220210284Sjmallett char *p; 221210284Sjmallett struct passwd *pwd; 222215990Sjmallett 223210284Sjmallett /* Make sure this is not stay NULL with -M "" */ 224215990Sjmallett extendarray(&members, &grmembers, 200); 225210284Sjmallett if (arg->ch == 'd') 226210284Sjmallett delete_members(&members, &grmembers, &i, arg, grp); 227210284Sjmallett else if (arg->ch == 'm') { 228215990Sjmallett int k = 0; 229210284Sjmallett 230210284Sjmallett while (grp->gr_mem[k] != NULL) { 231210284Sjmallett if (extendarray(&members, &grmembers, i + 2) != -1) 232210284Sjmallett members[i++] = grp->gr_mem[k]; 233210284Sjmallett k++; 234210284Sjmallett } 235210284Sjmallett } 236210284Sjmallett 237210284Sjmallett if (arg->ch != 'd') 238210284Sjmallett for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 239210284Sjmallett int j; 240210284Sjmallett 241210284Sjmallett /* 242210284Sjmallett * Check for duplicates 243210284Sjmallett */ 244210284Sjmallett pwd = lookup_pwent(p); 245210284Sjmallett for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++) 246210284Sjmallett ; 247210284Sjmallett if (j == i && extendarray(&members, &grmembers, i + 2) != -1) 248210284Sjmallett members[i++] = newstr(pwd->pw_name); 249210284Sjmallett } 250210284Sjmallett while (i < grmembers) 251210284Sjmallett members[i++] = NULL; 252210284Sjmallett grp->gr_mem = members; 253210284Sjmallett } 254210284Sjmallett 255210284Sjmallett if (getarg(args, 'N') != NULL) 256210284Sjmallett return print_group(grp, getarg(args, 'P') != NULL); 257210284Sjmallett 258210284Sjmallett if (mode == M_ADD && (rc = addgrent(grp)) != 0) { 259210284Sjmallett if (rc == -1) 260210284Sjmallett warnx("group '%s' already exists", grp->gr_name); 261210284Sjmallett else 262210284Sjmallett warn("group update"); 263210284Sjmallett return EX_IOERR; 264210284Sjmallett } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) { 265210284Sjmallett if (rc == -1) 266210284Sjmallett warnx("group '%s' not available (NIS?)", grp->gr_name); 267210284Sjmallett else 268210284Sjmallett warn("group update"); 269210284Sjmallett return EX_IOERR; 270210284Sjmallett } 271210284Sjmallett /* grp may have been invalidated */ 272210284Sjmallett if ((grp = GETGRNAM(a_name->val)) == NULL) 273210284Sjmallett errx(EX_SOFTWARE, "group disappeared during update"); 274210284Sjmallett 275210284Sjmallett pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid); 276210284Sjmallett 277210284Sjmallett free(members); 278210284Sjmallett 279210284Sjmallett return EXIT_SUCCESS; 280210284Sjmallett} 281210284Sjmallett 282210284Sjmallett 283210284Sjmallett/* 284210284Sjmallett * Lookup a passwd entry using a name or UID. 285210284Sjmallett */ 286210284Sjmallettstatic struct passwd * 287210284Sjmallettlookup_pwent(const char *user) 288210284Sjmallett{ 289210284Sjmallett struct passwd *pwd; 290210284Sjmallett 291210284Sjmallett if ((pwd = GETPWNAM(user)) == NULL && 292210284Sjmallett (!isdigit((unsigned char)*user) || 293210284Sjmallett (pwd = getpwuid((uid_t) atoi(user))) == NULL)) 294210284Sjmallett errx(EX_NOUSER, "user `%s' does not exist", user); 295210284Sjmallett 296210284Sjmallett return (pwd); 297210284Sjmallett} 298210284Sjmallett 299210284Sjmallett 300210284Sjmallett/* 301210284Sjmallett * Delete requested members from a group. 302210284Sjmallett */ 303210284Sjmallettstatic void 304210284Sjmallettdelete_members(char ***members, int *grmembers, int *i, struct carg *arg, 305210284Sjmallett struct group *grp) 306210284Sjmallett{ 307210284Sjmallett bool matchFound; 308210284Sjmallett char *user; 309210284Sjmallett char *valueCopy; 310210284Sjmallett char *valuePtr; 311210284Sjmallett int k; 312210284Sjmallett struct passwd *pwd; 313210284Sjmallett 314210284Sjmallett k = 0; 315210284Sjmallett while (grp->gr_mem[k] != NULL) { 316210284Sjmallett matchFound = false; 317210284Sjmallett if ((valueCopy = strdup(arg->val)) == NULL) 318210284Sjmallett errx(EX_UNAVAILABLE, "out of memory"); 319210284Sjmallett valuePtr = valueCopy; 320210284Sjmallett while ((user = strsep(&valuePtr, ", \t")) != NULL) { 321210284Sjmallett pwd = lookup_pwent(user); 322210284Sjmallett if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) { 323210284Sjmallett matchFound = true; 324210284Sjmallett break; 325210284Sjmallett } 326210284Sjmallett } 327210284Sjmallett free(valueCopy); 328210284Sjmallett 329210284Sjmallett if (!matchFound && 330210284Sjmallett extendarray(members, grmembers, *i + 2) != -1) 331210284Sjmallett (*members)[(*i)++] = grp->gr_mem[k]; 332210284Sjmallett 333210284Sjmallett k++; 334210284Sjmallett } 335210284Sjmallett 336210284Sjmallett return; 337210284Sjmallett} 338210284Sjmallett 339210284Sjmallett 340215990Sjmallettstatic gid_t 341210284Sjmallettgr_gidpolicy(struct userconf * cnf, struct cargs * args) 342210284Sjmallett{ 343210284Sjmallett struct group *grp; 344210284Sjmallett gid_t gid = (gid_t) - 1; 345210284Sjmallett struct carg *a_gid = getarg(args, 'g'); 346210284Sjmallett 347210284Sjmallett /* 348210284Sjmallett * Check the given gid, if any 349210284Sjmallett */ 350210284Sjmallett if (a_gid != NULL) { 351210284Sjmallett gid = (gid_t) atol(a_gid->val); 352210284Sjmallett 353210284Sjmallett if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL) 354210284Sjmallett errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid); 355210284Sjmallett } else { 356210284Sjmallett struct bitmap bm; 357210284Sjmallett 358210284Sjmallett /* 359210284Sjmallett * We need to allocate the next available gid under one of 360210284Sjmallett * two policies a) Grab the first unused gid b) Grab the 361210284Sjmallett * highest possible unused gid 362210284Sjmallett */ 363210284Sjmallett if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 364210284Sjmallett cnf->min_gid = 1000; 365210284Sjmallett cnf->max_gid = 32000; 366210284Sjmallett } 367210284Sjmallett bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 368210284Sjmallett 369210284Sjmallett /* 370210284Sjmallett * Now, let's fill the bitmap from the password file 371210284Sjmallett */ 372210284Sjmallett SETGRENT(); 373210284Sjmallett while ((grp = GETGRENT()) != NULL) 374210284Sjmallett if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && 375210284Sjmallett (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) 376210284Sjmallett bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 377210284Sjmallett ENDGRENT(); 378210284Sjmallett 379210284Sjmallett /* 380210284Sjmallett * Then apply the policy, with fallback to reuse if necessary 381210284Sjmallett */ 382210284Sjmallett if (cnf->reuse_gids) 383210284Sjmallett gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 384210284Sjmallett else { 385210284Sjmallett gid = (gid_t) (bm_lastset(&bm) + 1); 386210284Sjmallett if (!bm_isset(&bm, gid)) 387210284Sjmallett gid += cnf->min_gid; 388210284Sjmallett else 389210284Sjmallett gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 390210284Sjmallett } 391210284Sjmallett 392210284Sjmallett /* 393210284Sjmallett * Another sanity check 394210284Sjmallett */ 395210284Sjmallett if (gid < cnf->min_gid || gid > cnf->max_gid) 396210284Sjmallett errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used"); 397210284Sjmallett bm_dealloc(&bm); 398210284Sjmallett } 399210284Sjmallett return gid; 400210284Sjmallett} 401210284Sjmallett 402210284Sjmallett 403210284Sjmallettstatic int 404210284Sjmallettprint_group(struct group * grp, int pretty) 405210284Sjmallett{ 406210284Sjmallett if (!pretty) { 407210284Sjmallett char *buf = NULL; 408210284Sjmallett 409210284Sjmallett buf = gr_make(grp); 410210284Sjmallett fputs(buf, stdout); 411210284Sjmallett free(buf); 412210284Sjmallett } else { 413210284Sjmallett int i; 414210284Sjmallett 415210284Sjmallett printf("Group Name: %-15s #%lu\n" 416210284Sjmallett " Members: ", 417210284Sjmallett grp->gr_name, (long) grp->gr_gid); 418210284Sjmallett for (i = 0; grp->gr_mem[i]; i++) 419210284Sjmallett printf("%s%s", i ? "," : "", grp->gr_mem[i]); 420210284Sjmallett fputs("\n\n", stdout); 421210284Sjmallett } 422210284Sjmallett return EXIT_SUCCESS; 423210284Sjmallett} 424210284Sjmallett