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 <sys/types.h> 33 #include <sys/sbuf.h> 34 #include <string.h> 35 #include <ctype.h> 36 #include <fcntl.h> 37 #include <err.h> 38 39 #include "pw.h" 40 41 #define debugging 0 42 43 enum { 44 _UC_NONE, 45 _UC_DEFAULTPWD, 46 _UC_REUSEUID, 47 _UC_REUSEGID, 48 _UC_NISPASSWD, 49 _UC_DOTDIR, 50 _UC_NEWMAIL, 51 _UC_LOGFILE, 52 _UC_HOMEROOT, 53 _UC_HOMEMODE, 54 _UC_SHELLPATH, 55 _UC_SHELLS, 56 _UC_DEFAULTSHELL, 57 _UC_DEFAULTGROUP, 58 _UC_EXTRAGROUPS, 59 _UC_DEFAULTCLASS, 60 _UC_MINUID, 61 _UC_MAXUID, 62 _UC_MINGID, 63 _UC_MAXGID, 64 _UC_EXPIRE, 65 _UC_PASSWORD, 66 _UC_FIELDS 67 }; 68 69 static char bourne_shell[] = "sh"; 70 71 static char *system_shells[_UC_MAXSHELLS] = 72 { 73 bourne_shell, 74 "csh", 75 "tcsh" 76 }; 77 78 static char const *booltrue[] = 79 { 80 "yes", "true", "1", "on", NULL 81 }; 82 static char const *boolfalse[] = 83 { 84 "no", "false", "0", "off", NULL 85 }; 86 87 static struct userconf config = 88 { 89 0, /* Default password for new users? (nologin) */ 90 0, /* Reuse uids? */ 91 0, /* Reuse gids? */ 92 NULL, /* NIS version of the passwd file */ 93 "/usr/share/skel", /* Where to obtain skeleton files */ 94 NULL, /* Mail to send to new accounts */ 95 "/var/log/userlog", /* Where to log changes */ 96 "/home", /* Where to create home directory */ 97 _DEF_DIRMODE, /* Home directory perms, modified by umask */ 98 "/bin", /* Where shells are located */ 99 system_shells, /* List of shells (first is default) */ 100 bourne_shell, /* Default shell */ 101 NULL, /* Default group name */ 102 NULL, /* Default (additional) groups */ 103 NULL, /* Default login class */ 104 1000, 32000, /* Allowed range of uids */ 105 1000, 32000, /* Allowed range of gids */ 106 0, /* Days until account expires */ 107 0, /* Days until password expires */ 108 0 /* size of default_group array */ 109 }; 110 111 static char const *comments[_UC_FIELDS] = 112 { 113 "#\n# pw.conf - user/group configuration defaults\n#\n", 114 "\n# Password for new users? no=nologin yes=loginid none=blank random=random\n", 115 "\n# Reuse gaps in uid sequence? (yes or no)\n", 116 "\n# Reuse gaps in gid sequence? (yes or no)\n", 117 "\n# Path to the NIS passwd file (blank or 'no' for none)\n", 118 "\n# Obtain default dotfiles from this directory\n", 119 "\n# Mail this file to new user (/etc/newuser.msg or no)\n", 120 "\n# Log add/change/remove information in this file\n", 121 "\n# Root directory in which $HOME directory is created\n", 122 "\n# Mode for the new $HOME directory, will be modified by umask\n", 123 "\n# Colon separated list of directories containing valid shells\n", 124 "\n# Comma separated list of available shells (without paths)\n", 125 "\n# Default shell (without path)\n", 126 "\n# Default group (leave blank for new group per user)\n", 127 "\n# Extra groups for new users\n", 128 "\n# Default login class for new users\n", 129 "\n# Range of valid default user ids\n", 130 NULL, 131 "\n# Range of valid default group ids\n", 132 NULL, 133 "\n# Days after which account expires (0=disabled)\n", 134 "\n# Days after which password expires (0=disabled)\n" 135 }; 136 137 static char const *kwds[] = 138 { 139 "", 140 "defaultpasswd", 141 "reuseuids", 142 "reusegids", 143 "nispasswd", 144 "skeleton", 145 "newmail", 146 "logfile", 147 "home", 148 "homemode", 149 "shellpath", 150 "shells", 151 "defaultshell", 152 "defaultgroup", 153 "extragroups", 154 "defaultclass", 155 "minuid", 156 "maxuid", 157 "mingid", 158 "maxgid", 159 "expire_days", 160 "password_days", 161 NULL 162 }; 163 164 static char * 165 unquote(char const * str) 166 { 167 if (str && (*str == '"' || *str == '\'')) { 168 char *p = strchr(str + 1, *str); 169 170 if (p != NULL) 171 *p = '\0'; 172 return (char *) (*++str ? str : NULL); 173 } 174 return (char *) str; 175 } 176 177 int 178 boolean_val(char const * str, int dflt) 179 { 180 if ((str = unquote(str)) != NULL) { 181 int i; 182 183 for (i = 0; booltrue[i]; i++) 184 if (strcmp(str, booltrue[i]) == 0) 185 return 1; 186 for (i = 0; boolfalse[i]; i++) 187 if (strcmp(str, boolfalse[i]) == 0) 188 return 0; 189 190 /* 191 * Special cases for defaultpassword 192 */ 193 if (strcmp(str, "random") == 0) 194 return -1; 195 if (strcmp(str, "none") == 0) 196 return -2; 197 } 198 return dflt; 199 } 200 201 char const * 202 boolean_str(int val) 203 { 204 if (val == -1) 205 return "random"; 206 else if (val == -2) 207 return "none"; 208 else 209 return val ? booltrue[0] : boolfalse[0]; 210 } 211 212 char * 213 newstr(char const * p) 214 { 215 char *q; 216 217 if ((p = unquote(p)) == NULL) 218 return (NULL); 219 220 if ((q = strdup(p)) == NULL) 221 err(1, "strdup()"); 222 223 return (q); 224 } 225 226 struct userconf * 227 read_userconfig(char const * file) 228 { 229 FILE *fp; 230 char *buf, *p; 231 size_t linecap; 232 ssize_t linelen; 233 234 buf = NULL; 235 linecap = 0; 236 237 config.numgroups = 200; 238 config.groups = calloc(config.numgroups, sizeof(char *)); 239 if (config.groups == NULL) 240 err(1, "calloc()"); 241 if (file == NULL) 242 file = _PATH_PW_CONF; 243 244 if ((fp = fopen(file, "r")) == NULL) 245 return (&config); 246 247 while ((linelen = getline(&buf, &linecap, fp)) > 0) { 248 if (*buf && (p = strtok(buf, " \t\r\n=")) != NULL && *p != '#') { 249 static char const toks[] = " \t\r\n,="; 250 char *q = strtok(NULL, toks); 251 int i = 0; 252 mode_t *modeset; 253 254 while (i < _UC_FIELDS && strcmp(p, kwds[i]) != 0) 255 ++i; 256 #if debugging 257 if (i == _UC_FIELDS) 258 printf("Got unknown kwd `%s' val=`%s'\n", p, q ? q : ""); 259 else 260 printf("Got kwd[%s]=%s\n", p, q); 261 #endif 262 switch (i) { 263 case _UC_DEFAULTPWD: 264 config.default_password = boolean_val(q, 1); 265 break; 266 case _UC_REUSEUID: 267 config.reuse_uids = boolean_val(q, 0); 268 break; 269 case _UC_REUSEGID: 270 config.reuse_gids = boolean_val(q, 0); 271 break; 272 case _UC_NISPASSWD: 273 config.nispasswd = (q == NULL || !boolean_val(q, 1)) 274 ? NULL : newstr(q); 275 break; 276 case _UC_DOTDIR: 277 config.dotdir = (q == NULL || !boolean_val(q, 1)) 278 ? NULL : newstr(q); 279 break; 280 case _UC_NEWMAIL: 281 config.newmail = (q == NULL || !boolean_val(q, 1)) 282 ? NULL : newstr(q); 283 break; 284 case _UC_LOGFILE: 285 config.logfile = (q == NULL || !boolean_val(q, 1)) 286 ? NULL : newstr(q); 287 break; 288 case _UC_HOMEROOT: 289 config.home = (q == NULL || !boolean_val(q, 1)) 290 ? "/home" : newstr(q); 291 break; 292 case _UC_HOMEMODE: 293 modeset = setmode(q); 294 config.homemode = (q == NULL || !boolean_val(q, 1)) 295 ? _DEF_DIRMODE : getmode(modeset, _DEF_DIRMODE); 296 free(modeset); 297 break; 298 case _UC_SHELLPATH: 299 config.shelldir = (q == NULL || !boolean_val(q, 1)) 300 ? "/bin" : newstr(q); 301 break; 302 case _UC_SHELLS: 303 for (i = 0; i < _UC_MAXSHELLS && q != NULL; i++, q = strtok(NULL, toks)) 304 system_shells[i] = newstr(q); 305 if (i > 0) 306 while (i < _UC_MAXSHELLS) 307 system_shells[i++] = NULL; 308 break; 309 case _UC_DEFAULTSHELL: 310 config.shell_default = (q == NULL || !boolean_val(q, 1)) 311 ? (char *) bourne_shell : newstr(q); 312 break; 313 case _UC_DEFAULTGROUP: 314 q = unquote(q); 315 config.default_group = (q == NULL || !boolean_val(q, 1) || GETGRNAM(q) == NULL) 316 ? NULL : newstr(q); 317 break; 318 case _UC_EXTRAGROUPS: 319 for (i = 0; q != NULL; q = strtok(NULL, toks)) { 320 if (extendarray(&config.groups, &config.numgroups, i + 2) != -1) 321 config.groups[i++] = newstr(q); 322 } 323 if (i > 0) 324 while (i < config.numgroups) 325 config.groups[i++] = NULL; 326 break; 327 case _UC_DEFAULTCLASS: 328 config.default_class = (q == NULL || !boolean_val(q, 1)) 329 ? NULL : newstr(q); 330 break; 331 case _UC_MINUID: 332 if ((q = unquote(q)) != NULL && isdigit(*q)) 333 config.min_uid = (uid_t) atol(q); 334 break; 335 case _UC_MAXUID: 336 if ((q = unquote(q)) != NULL && isdigit(*q)) 337 config.max_uid = (uid_t) atol(q); 338 break; 339 case _UC_MINGID: 340 if ((q = unquote(q)) != NULL && isdigit(*q)) 341 config.min_gid = (gid_t) atol(q); 342 break; 343 case _UC_MAXGID: 344 if ((q = unquote(q)) != NULL && isdigit(*q)) 345 config.max_gid = (gid_t) atol(q); 346 break; 347 case _UC_EXPIRE: 348 if ((q = unquote(q)) != NULL && isdigit(*q)) 349 config.expire_days = atoi(q); 350 break; 351 case _UC_PASSWORD: 352 if ((q = unquote(q)) != NULL && isdigit(*q)) 353 config.password_days = atoi(q); 354 break; 355 case _UC_FIELDS: 356 case _UC_NONE: 357 break; 358 } 359 } 360 } 361 free(buf); 362 fclose(fp); 363 364 return (&config); 365 } 366 367 368 int 369 write_userconfig(char const * file) 370 { 371 int fd; 372 int i, j; 373 struct sbuf *buf; 374 FILE *fp; 375 376 if (file == NULL) 377 file = _PATH_PW_CONF; 378 379 if ((fd = open(file, O_CREAT|O_RDWR|O_TRUNC|O_EXLOCK, 0644)) == -1) 380 return (0); 381 382 if ((fp = fdopen(fd, "w")) == NULL) { 383 close(fd); 384 return (0); 385 } 386 387 buf = sbuf_new_auto(); 388 for (i = _UC_NONE; i < _UC_FIELDS; i++) { 389 int quote = 1; 390 391 sbuf_clear(buf); 392 switch (i) { 393 case _UC_DEFAULTPWD: 394 sbuf_cat(buf, boolean_str(config.default_password)); 395 break; 396 case _UC_REUSEUID: 397 sbuf_cat(buf, boolean_str(config.reuse_uids)); 398 break; 399 case _UC_REUSEGID: 400 sbuf_cat(buf, boolean_str(config.reuse_gids)); 401 break; 402 case _UC_NISPASSWD: 403 sbuf_cat(buf, config.nispasswd ? config.nispasswd : 404 ""); 405 quote = 0; 406 break; 407 case _UC_DOTDIR: 408 sbuf_cat(buf, config.dotdir ? config.dotdir : 409 boolean_str(0)); 410 break; 411 case _UC_NEWMAIL: 412 sbuf_cat(buf, config.newmail ? config.newmail : 413 boolean_str(0)); 414 break; 415 case _UC_LOGFILE: 416 sbuf_cat(buf, config.logfile ? config.logfile : 417 boolean_str(0)); 418 break; 419 case _UC_HOMEROOT: 420 sbuf_cat(buf, config.home); 421 break; 422 case _UC_HOMEMODE: 423 sbuf_printf(buf, "%04o", config.homemode); 424 quote = 0; 425 break; 426 case _UC_SHELLPATH: 427 sbuf_cat(buf, config.shelldir); 428 break; 429 case _UC_SHELLS: 430 for (j = 0; j < _UC_MAXSHELLS && 431 system_shells[j] != NULL; j++) 432 sbuf_printf(buf, "%s\"%s\"", j ? 433 "," : "", system_shells[j]); 434 quote = 0; 435 break; 436 case _UC_DEFAULTSHELL: 437 sbuf_cat(buf, config.shell_default ? 438 config.shell_default : bourne_shell); 439 break; 440 case _UC_DEFAULTGROUP: 441 sbuf_cat(buf, config.default_group ? 442 config.default_group : ""); 443 break; 444 case _UC_EXTRAGROUPS: 445 for (j = 0; j < config.numgroups && 446 config.groups[j] != NULL; j++) 447 sbuf_printf(buf, "%s\"%s\"", j ? 448 "," : "", config.groups[j]); 449 quote = 0; 450 break; 451 case _UC_DEFAULTCLASS: 452 sbuf_cat(buf, config.default_class ? 453 config.default_class : ""); 454 break; 455 case _UC_MINUID: 456 sbuf_printf(buf, "%u", config.min_uid); 457 quote = 0; 458 break; 459 case _UC_MAXUID: 460 sbuf_printf(buf, "%u", config.max_uid); 461 quote = 0; 462 break; 463 case _UC_MINGID: 464 sbuf_printf(buf, "%u", config.min_gid); 465 quote = 0; 466 break; 467 case _UC_MAXGID: 468 sbuf_printf(buf, "%u", config.max_gid); 469 quote = 0; 470 break; 471 case _UC_EXPIRE: 472 sbuf_printf(buf, "%d", config.expire_days); 473 quote = 0; 474 break; 475 case _UC_PASSWORD: 476 sbuf_printf(buf, "%d", config.password_days); 477 quote = 0; 478 break; 479 case _UC_NONE: 480 break; 481 } 482 sbuf_finish(buf); 483 484 if (comments[i]) 485 fputs(comments[i], fp); 486 487 if (*kwds[i]) { 488 if (quote) 489 fprintf(fp, "%s = \"%s\"\n", kwds[i], 490 sbuf_data(buf)); 491 else 492 fprintf(fp, "%s = %s\n", kwds[i], sbuf_data(buf)); 493 #if debugging 494 printf("WROTE: %s = %s\n", kwds[i], sbuf_data(buf)); 495 #endif 496 } 497 } 498 sbuf_delete(buf); 499 return (fclose(fp) != EOF); 500 } 501