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 * $Id$ 27 */ 28 29 #include <unistd.h> 30 #include <ctype.h> 31 #include <termios.h> 32 33 #include "pw.h" 34 #include "bitmap.h" 35 #include "pwupd.h" 36 37 38 static int print_group(struct group * grp, int pretty); 39 static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args); 40 41 int 42 pw_group(struct userconf * cnf, int mode, struct cargs * args) 43 { 44 struct carg *a_name = getarg(args, 'n'); 45 struct carg *a_gid = getarg(args, 'g'); 46 struct carg *arg; 47 struct group *grp = NULL; 48 int grmembers = 0; 49 char **members = NULL; 50 51 static struct group fakegroup = 52 { 53 "nogroup", 54 "*", 55 -1, 56 NULL 57 }; 58 59 /* 60 * With M_NEXT, we only need to return the 61 * next gid to stdout 62 */ 63 if (mode == M_NEXT) 64 { 65 gid_t next = gr_gidpolicy(cnf, args); 66 if (getarg(args, 'q')) 67 return next; 68 printf("%ld\n", (long)next); 69 return EXIT_SUCCESS; 70 } 71 72 if (mode == M_PRINT && getarg(args, 'a')) { 73 int pretty = getarg(args, 'P') != NULL; 74 75 setgrent(); 76 while ((grp = getgrent()) != NULL) 77 print_group(grp, pretty); 78 endgrent(); 79 return EXIT_SUCCESS; 80 } 81 if (a_gid == NULL) { 82 if (a_name == NULL) 83 cmderr(EX_DATAERR, "group name or id required\n"); 84 85 if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) { 86 (a_gid = a_name)->ch = 'g'; 87 a_name = NULL; 88 } 89 } 90 grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val)); 91 92 if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 93 if (a_name == NULL && grp == NULL) /* Try harder */ 94 grp = getgrgid(atoi(a_gid->val)); 95 96 if (grp == NULL) { 97 if (mode == M_PRINT && getarg(args, 'F')) { 98 char *fmems[1]; 99 fmems[0] = NULL; 100 fakegroup.gr_name = a_name ? a_name->val : "nogroup"; 101 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1; 102 fakegroup.gr_mem = fmems; 103 return print_group(&fakegroup, getarg(args, 'P') != NULL); 104 } 105 cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val); 106 } 107 if (a_name == NULL) /* Needed later */ 108 a_name = addarg(args, 'n', grp->gr_name); 109 110 /* 111 * Handle deletions now 112 */ 113 if (mode == M_DELETE) { 114 gid_t gid = grp->gr_gid; 115 116 if (delgrent(grp) == -1) 117 cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno)); 118 pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid); 119 return EXIT_SUCCESS; 120 } else if (mode == M_PRINT) 121 return print_group(grp, getarg(args, 'P') != NULL); 122 123 if (a_gid) 124 grp->gr_gid = (gid_t) atoi(a_gid->val); 125 126 if ((arg = getarg(args, 'l')) != NULL) 127 grp->gr_name = pw_checkname((u_char *)arg->val, 0); 128 } else { 129 if (a_name == NULL) /* Required */ 130 cmderr(EX_DATAERR, "group name required\n"); 131 else if (grp != NULL) /* Exists */ 132 cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val); 133 134 extendarray(&members, &grmembers, 200); 135 members[0] = NULL; 136 grp = &fakegroup; 137 grp->gr_name = pw_checkname((u_char *)a_name->val, 0); 138 grp->gr_passwd = "*"; 139 grp->gr_gid = gr_gidpolicy(cnf, args); 140 grp->gr_mem = members; 141 } 142 143 /* 144 * This allows us to set a group password Group passwords is an 145 * antique idea, rarely used and insecure (no secure database) Should 146 * be discouraged, but it is apparently still supported by some 147 * software. 148 */ 149 150 if ((arg = getarg(args, 'h')) != NULL) { 151 if (strcmp(arg->val, "-") == 0) 152 grp->gr_passwd = "*"; /* No access */ 153 else { 154 int fd = atoi(arg->val); 155 int b; 156 int istty = isatty(fd); 157 struct termios t; 158 char *p, line[256]; 159 160 if (istty) { 161 if (tcgetattr(fd, &t) == -1) 162 istty = 0; 163 else { 164 struct termios n = t; 165 166 /* Disable echo */ 167 n.c_lflag &= ~(ECHO); 168 tcsetattr(fd, TCSANOW, &n); 169 printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); 170 fflush(stdout); 171 } 172 } 173 b = read(fd, line, sizeof(line) - 1); 174 if (istty) { /* Restore state */ 175 tcsetattr(fd, TCSANOW, &t); 176 fputc('\n', stdout); 177 fflush(stdout); 178 } 179 if (b < 0) { 180 perror("-h file descriptor"); 181 return EX_OSERR; 182 } 183 line[b] = '\0'; 184 if ((p = strpbrk(line, " \t\r\n")) != NULL) 185 *p = '\0'; 186 if (!*line) 187 cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd); 188 grp->gr_passwd = pw_pwcrypt(line); 189 } 190 } 191 192 if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) { 193 int i = 0; 194 char *p; 195 struct passwd *pwd; 196 197 /* Make sure this is not stay NULL with -M "" */ 198 extendarray(&members, &grmembers, 200); 199 if (arg->ch == 'm') { 200 int k = 0; 201 202 while (grp->gr_mem[k] != NULL) { 203 if (extendarray(&members, &grmembers, i + 2) != -1) { 204 members[i++] = grp->gr_mem[k]; 205 } 206 k++; 207 } 208 } 209 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 210 int j; 211 if ((pwd = getpwnam(p)) == NULL) { 212 if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL) 213 cmderr(EX_NOUSER, "user `%s' does not exist\n", p); 214 } 215 /* 216 * Check for duplicates 217 */ 218 for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++) 219 ; 220 if (j == i && extendarray(&members, &grmembers, i + 2) != -1) 221 members[i++] = newstr(pwd->pw_name); 222 } 223 while (i < grmembers) 224 members[i++] = NULL; 225 grp->gr_mem = members; 226 } 227 228 if (getarg(args, 'N') != NULL) 229 return print_group(grp, getarg(args, 'P') != NULL); 230 231 if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) { 232 perror("group update"); 233 return EX_IOERR; 234 } 235 /* grp may have been invalidated */ 236 if ((grp = getgrnam(a_name->val)) == NULL) 237 cmderr(EX_SOFTWARE, "group disappeared during update\n"); 238 239 pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid); 240 241 if (members) 242 free(members); 243 244 return EXIT_SUCCESS; 245 } 246 247 248 static gid_t 249 gr_gidpolicy(struct userconf * cnf, struct cargs * args) 250 { 251 struct group *grp; 252 gid_t gid = (gid_t) - 1; 253 struct carg *a_gid = getarg(args, 'g'); 254 255 /* 256 * Check the given gid, if any 257 */ 258 if (a_gid != NULL) { 259 gid = (gid_t) atol(a_gid->val); 260 261 if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL) 262 cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid); 263 } else { 264 struct bitmap bm; 265 266 /* 267 * We need to allocate the next available gid under one of 268 * two policies a) Grab the first unused gid b) Grab the 269 * highest possible unused gid 270 */ 271 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 272 cnf->min_gid = 1000; 273 cnf->max_gid = 32000; 274 } 275 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 276 277 /* 278 * Now, let's fill the bitmap from the password file 279 */ 280 setgrent(); 281 while ((grp = getgrent()) != NULL) 282 if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid) 283 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 284 endgrent(); 285 286 /* 287 * Then apply the policy, with fallback to reuse if necessary 288 */ 289 if (cnf->reuse_gids) 290 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 291 else { 292 gid = (gid_t) (bm_lastset(&bm) + 1); 293 if (!bm_isset(&bm, gid)) 294 gid += cnf->min_gid; 295 else 296 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 297 } 298 299 /* 300 * Another sanity check 301 */ 302 if (gid < cnf->min_gid || gid > cnf->max_gid) 303 cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n"); 304 bm_dealloc(&bm); 305 } 306 return gid; 307 } 308 309 310 static int 311 print_group(struct group * grp, int pretty) 312 { 313 if (!pretty) { 314 int buflen = 0; 315 char *buf = NULL; 316 317 fmtgrent(&buf, &buflen, grp); 318 fputs(buf, stdout); 319 free(buf); 320 } else { 321 int i; 322 323 printf("Group Name: %-15s #%lu\n" 324 " Members: ", 325 grp->gr_name, (long) grp->gr_gid); 326 for (i = 0; grp->gr_mem[i]; i++) 327 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 328 fputs("\n\n", stdout); 329 } 330 return EXIT_SUCCESS; 331 } 332