1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 27 #include <sys/types.h> 28 #include <sys/wait.h> 29 #include <sys/stat.h> 30 #include <fcntl.h> 31 #include <stdlib.h> 32 #include <security/pam_appl.h> 33 #include <security/pam_modules.h> 34 #include <security/pam_impl.h> 35 #include <syslog.h> 36 #include <pwd.h> 37 #include <shadow.h> 38 #include <lastlog.h> 39 #include <ctype.h> 40 #include <unistd.h> 41 #include <stdlib.h> 42 #include <stdio.h> 43 #include <libintl.h> 44 #include <signal.h> 45 #include <thread.h> 46 #include <synch.h> 47 #include <errno.h> 48 #include <time.h> 49 #include <string.h> 50 #include <crypt.h> 51 #include <assert.h> 52 #include <deflt.h> 53 #include <libintl.h> 54 #include <passwdutil.h> 55 56 #define LASTLOG "/var/adm/lastlog" 57 #define LOGINADMIN "/etc/default/login" 58 #define UNIX_AUTH_DATA "SUNW-UNIX-AUTH-DATA" 59 #define UNIX_AUTHTOK_DATA "SUNW-UNIX-AUTHTOK-DATA" 60 61 /* 62 * Function Declarations 63 */ 64 extern int defopen(char *); 65 extern char *defread(char *); 66 extern void setusershell(); 67 extern int _nfssys(int, void *); 68 69 typedef struct _unix_authtok_data_ { 70 int age_status; 71 }unix_authtok_data; 72 73 /*ARGSUSED*/ 74 static void 75 unix_cleanup( 76 pam_handle_t *pamh, 77 void *data, 78 int pam_status) 79 { 80 free((unix_authtok_data *)data); 81 } 82 83 /* 84 * check_for_login_inactivity - Check for login inactivity 85 * 86 */ 87 88 static int 89 check_for_login_inactivity( 90 uid_t pw_uid, 91 struct spwd *shpwd) 92 { 93 int fdl; 94 struct lastlog ll; 95 int retval; 96 offset_t offset; 97 98 offset = (offset_t)pw_uid * (offset_t)sizeof (struct lastlog); 99 100 if ((fdl = open(LASTLOG, O_RDWR|O_CREAT, 0444)) >= 0) { 101 /* 102 * Read the last login (ll) time 103 */ 104 if (llseek(fdl, offset, SEEK_SET) != offset) { 105 syslog(LOG_ERR, "pam_unix_acct: pam_sm_acct_mgmt: " 106 "can't obtain last login info on uid %d " 107 "(uid too large)", pw_uid); 108 return (0); 109 } 110 111 retval = read(fdl, (char *)&ll, sizeof (ll)); 112 113 /* Check for login inactivity */ 114 115 if ((shpwd->sp_inact > 0) && (retval == sizeof (ll)) && 116 ll.ll_time) { 117 /* 118 * account inactive too long. 119 * and no update password set 120 * and no last pwd change date in shadow file 121 * and last pwd change more than inactive time 122 * then account inactive too long and no access. 123 */ 124 if (((time_t)((ll.ll_time / DAY) + shpwd->sp_inact) 125 < DAY_NOW) && 126 (shpwd->sp_lstchg != 0) && 127 (shpwd->sp_lstchg != -1) && 128 ((shpwd->sp_lstchg + shpwd->sp_inact) < DAY_NOW)) { 129 /* 130 * Account inactive for too long 131 */ 132 (void) close(fdl); 133 return (1); 134 } 135 } 136 137 (void) close(fdl); 138 } 139 return (0); 140 } 141 142 /* 143 * new_password_check() 144 * 145 * check to see if the user needs to change their password 146 */ 147 148 static int 149 new_password_check(pw_uid, shpwd, flags) 150 uid_t pw_uid; 151 struct spwd *shpwd; 152 int flags; 153 { 154 time_t now = DAY_NOW; 155 156 /* 157 * We want to make sure that we change the password only if 158 * passwords are required for the system, the user does not 159 * have a password, AND the user's NULL password can be changed 160 * according to its password aging information 161 */ 162 163 if ((flags & PAM_DISALLOW_NULL_AUTHTOK) != 0) { 164 if (shpwd->sp_pwdp[0] == '\0') { 165 if ((pw_uid != 0) && 166 ((shpwd->sp_max == -1) || 167 ((time_t)shpwd->sp_lstchg > now) || 168 ((now >= (time_t)(shpwd->sp_lstchg + 169 shpwd->sp_min)) && 170 (shpwd->sp_max >= shpwd->sp_min)))) { 171 return (PAM_NEW_AUTHTOK_REQD); 172 } 173 } 174 } 175 return (PAM_SUCCESS); 176 } 177 178 /* 179 * perform_passwd_aging_check 180 * - Check for password exipration. 181 */ 182 static int 183 perform_passwd_aging_check( 184 pam_handle_t *pamh, 185 struct spwd *shpwd, 186 int flags) 187 { 188 time_t now = DAY_NOW; 189 int idledays = -1; 190 char *ptr; 191 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; 192 193 194 if (defopen(LOGINADMIN) == 0) { 195 if ((ptr = defread("IDLEWEEKS=")) != NULL) 196 idledays = 7 * atoi(ptr); 197 (void) defopen(NULL); 198 } 199 200 /* 201 * if (sp_lstchg == 0), the administrator has forced the 202 * user to change his/her passwd 203 */ 204 if (shpwd->sp_lstchg == 0) 205 return (PAM_NEW_AUTHTOK_REQD); 206 207 /* If password aging is disabled (or min>max), all is well */ 208 if (shpwd->sp_max < 0 || shpwd->sp_max < shpwd->sp_min) 209 return (PAM_SUCCESS); 210 211 /* Password aging is enabled. See if the password has aged */ 212 if (now < (time_t)(shpwd->sp_lstchg + shpwd->sp_max)) 213 return (PAM_SUCCESS); 214 215 /* Password has aged. Has it aged more than idledays ? */ 216 if (idledays < 0) /* IDLEWEEKS not configured */ 217 return (PAM_NEW_AUTHTOK_REQD); 218 219 /* idledays is configured */ 220 if (idledays > 0 && (now < (time_t)(shpwd->sp_lstchg + idledays))) 221 return (PAM_NEW_AUTHTOK_REQD); 222 223 /* password has aged more that allowed for by IDLEWEEKS */ 224 if (!(flags & PAM_SILENT)) { 225 (void) strlcpy(messages[0], dgettext(TEXT_DOMAIN, 226 "Your password has been expired for too long."), 227 sizeof (messages[0])); 228 (void) strlcpy(messages[1], dgettext(TEXT_DOMAIN, 229 "Please contact the system administrator."), 230 sizeof (messages[0])); 231 (void) __pam_display_msg(pamh, PAM_ERROR_MSG, 2, messages, 232 NULL); 233 } 234 return (PAM_AUTHTOK_EXPIRED); 235 } 236 237 /* 238 * warn_user_passwd_will_expire - warn the user when the password will 239 * expire. 240 */ 241 242 static void 243 warn_user_passwd_will_expire( 244 pam_handle_t *pamh, 245 struct spwd shpwd) 246 { 247 time_t now = DAY_NOW; 248 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; 249 time_t days; 250 251 252 if ((shpwd.sp_warn > 0) && (shpwd.sp_max > 0) && 253 (now + shpwd.sp_warn) >= (time_t)(shpwd.sp_lstchg + shpwd.sp_max)) { 254 days = (time_t)(shpwd.sp_lstchg + shpwd.sp_max) - now; 255 if (days <= 0) 256 (void) snprintf(messages[0], 257 sizeof (messages[0]), 258 dgettext(TEXT_DOMAIN, 259 "Your password will expire within 24 hours.")); 260 else if (days == 1) 261 (void) snprintf(messages[0], 262 sizeof (messages[0]), 263 dgettext(TEXT_DOMAIN, 264 "Your password will expire in 1 day.")); 265 else 266 (void) snprintf(messages[0], 267 sizeof (messages[0]), 268 dgettext(TEXT_DOMAIN, 269 "Your password will expire in %d days."), 270 (int)days); 271 272 (void) __pam_display_msg(pamh, PAM_TEXT_INFO, 1, messages, 273 NULL); 274 } 275 } 276 277 /* 278 * pam_sm_acct_mgmt - main account managment routine. 279 * Returns: module error or specific error on failure 280 */ 281 282 int 283 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) 284 { 285 uid_t pw_uid; 286 char *repository_name = NULL; 287 char *user; 288 attrlist attr_pw[3]; 289 attrlist attr_spw[7]; 290 pwu_repository_t *pwu_rep = PWU_DEFAULT_REP; 291 pwu_repository_t *auth_rep = NULL; 292 int error = PAM_ACCT_EXPIRED; 293 int result; 294 int i; 295 int debug = 0; 296 int server_policy = 0; 297 unix_authtok_data *status; 298 struct spwd shpwd = {NULL, NULL, 299 -1, -1, -1, -1, -1, -1, 0}; 300 301 for (i = 0; i < argc; i++) { 302 if (strcasecmp(argv[i], "debug") == 0) 303 debug = 1; 304 else if (strcasecmp(argv[i], "server_policy") == 0) 305 server_policy = 1; 306 else if (strcasecmp(argv[i], "nowarn") == 0) { 307 flags = flags | PAM_SILENT; 308 } else { 309 syslog(LOG_ERR, 310 "ACCOUNT:pam_sm_acct_mgmt: illegal option %s", 311 argv[i]); 312 } 313 } 314 315 if (debug) 316 syslog(LOG_AUTH | LOG_DEBUG, 317 "pam_unix_account: entering pam_sm_acct_mgmt()"); 318 319 if ((error = pam_get_item(pamh, PAM_USER, (void **)&user)) 320 != PAM_SUCCESS) 321 goto out; 322 323 if (user == NULL) { 324 error = PAM_USER_UNKNOWN; 325 goto out; 326 } else 327 shpwd.sp_namp = user; 328 329 if ((error = pam_get_item(pamh, PAM_REPOSITORY, (void **)&auth_rep)) 330 != PAM_SUCCESS) 331 goto out; 332 333 if (auth_rep == NULL) { 334 pwu_rep = PWU_DEFAULT_REP; 335 } else { 336 if ((pwu_rep = calloc(1, sizeof (*pwu_rep))) == NULL) { 337 error = PAM_BUF_ERR; 338 goto out; 339 } 340 pwu_rep->type = auth_rep->type; 341 pwu_rep->scope = auth_rep->scope; 342 pwu_rep->scope_len = auth_rep->scope_len; 343 } 344 345 /* 346 * First get the password information 347 */ 348 attr_pw[0].type = ATTR_REP_NAME; attr_pw[0].next = &attr_pw[1]; 349 attr_pw[1].type = ATTR_UID; attr_pw[1].next = &attr_pw[2]; 350 attr_pw[2].type = ATTR_PASSWD; attr_pw[2].next = NULL; 351 result = __get_authtoken_attr(user, pwu_rep, attr_pw); 352 353 if (result == PWU_NOT_FOUND) { 354 error = PAM_USER_UNKNOWN; 355 goto out; 356 } else if (result == PWU_DENIED) { 357 error = PAM_PERM_DENIED; 358 goto out; 359 } else if (result == PWU_NOMEM) { 360 error = PAM_BUF_ERR; 361 goto out; 362 } else if (result != PWU_SUCCESS) { 363 error = PAM_SERVICE_ERR; 364 goto out; 365 } else { 366 repository_name = attr_pw[0].data.val_s; 367 pw_uid = attr_pw[1].data.val_i; 368 shpwd.sp_pwdp = attr_pw[2].data.val_s; 369 } 370 371 /* 372 * if repository is not files|nis|nisplus, and 373 * user wants server_policy, we don't care 374 * about aging and hence return PAM_IGNORE 375 */ 376 if (server_policy && 377 strcmp(repository_name, "files") != 0 && 378 strcmp(repository_name, "nis") != 0 && 379 strcmp(repository_name, "nisplus") != 0) { 380 error = PAM_IGNORE; 381 goto out; 382 } 383 384 /* 385 * Now get the aging information 386 */ 387 attr_spw[0].type = ATTR_LSTCHG; attr_spw[0].next = &attr_spw[1]; 388 attr_spw[1].type = ATTR_MIN; attr_spw[1].next = &attr_spw[2]; 389 attr_spw[2].type = ATTR_MAX; attr_spw[2].next = &attr_spw[3]; 390 attr_spw[3].type = ATTR_WARN; attr_spw[3].next = &attr_spw[4]; 391 attr_spw[4].type = ATTR_INACT; attr_spw[4].next = &attr_spw[5]; 392 attr_spw[5].type = ATTR_EXPIRE; attr_spw[5].next = &attr_spw[6]; 393 attr_spw[6].type = ATTR_FLAG; attr_spw[6].next = NULL; 394 395 result = __get_authtoken_attr(user, pwu_rep, attr_spw); 396 if (result == PWU_SUCCESS) { 397 shpwd.sp_lstchg = attr_spw[0].data.val_i; 398 shpwd.sp_min = attr_spw[1].data.val_i; 399 shpwd.sp_max = attr_spw[2].data.val_i; 400 shpwd.sp_warn = attr_spw[3].data.val_i; 401 shpwd.sp_inact = attr_spw[4].data.val_i; 402 shpwd.sp_expire = attr_spw[5].data.val_i; 403 shpwd.sp_flag = attr_spw[6].data.val_i; 404 } 405 406 if (debug) { 407 char *pw = "Unix PW"; 408 409 if (shpwd.sp_pwdp == NULL) 410 pw = "NULL"; 411 else if (strncmp(shpwd.sp_pwdp, LOCKSTRING, 412 sizeof (LOCKSTRING) - 1) == 0) 413 pw = LOCKSTRING; 414 else if (strcmp(shpwd.sp_pwdp, NOPWDRTR) == 0) 415 pw = NOPWDRTR; 416 417 if (result == PWU_DENIED) { 418 syslog(LOG_AUTH | LOG_DEBUG, 419 "pam_unix_account: %s: permission denied " 420 "to access password aging information. " 421 "Using defaults.", user); 422 } 423 424 syslog(LOG_AUTH | LOG_DEBUG, 425 "%s Policy:Unix, pw=%s, lstchg=%d, min=%d, max=%d, " 426 "warn=%d, inact=%d, expire=%d", 427 user, pw, shpwd.sp_lstchg, shpwd.sp_min, shpwd.sp_max, 428 shpwd.sp_warn, shpwd.sp_inact, shpwd.sp_expire); 429 } 430 431 if (pwu_rep != PWU_DEFAULT_REP) { 432 free(pwu_rep); 433 pwu_rep = PWU_DEFAULT_REP; 434 } 435 436 if (result == PWU_NOT_FOUND) { 437 error = PAM_USER_UNKNOWN; 438 goto out; 439 } else if (result == PWU_NOMEM) { 440 error = PAM_BUF_ERR; 441 goto out; 442 } else if (result != PWU_SUCCESS && result != PWU_DENIED) { 443 error = PAM_SERVICE_ERR; 444 goto out; 445 } 446 447 /* 448 * Check for locked account 449 */ 450 if (shpwd.sp_pwdp != NULL && 451 strncmp(shpwd.sp_pwdp, LOCKSTRING, sizeof (LOCKSTRING) - 1) == 0) { 452 char *service; 453 char *rhost = NULL; 454 455 (void) pam_get_item(pamh, PAM_SERVICE, (void **)&service); 456 (void) pam_get_item(pamh, PAM_RHOST, (void **)&rhost); 457 __pam_log(LOG_AUTH | LOG_NOTICE, 458 "pam_unix_account: %s attempting to validate locked " 459 "account %s from %s", 460 service, user, 461 (rhost != NULL && *rhost != '\0') ? rhost : "local host"); 462 error = PAM_PERM_DENIED; 463 goto out; 464 } 465 466 /* 467 * Check for account expiration 468 */ 469 if (shpwd.sp_expire > 0 && 470 (time_t)shpwd.sp_expire < DAY_NOW) { 471 error = PAM_ACCT_EXPIRED; 472 goto out; 473 } 474 475 /* 476 * Check for excessive login account inactivity 477 */ 478 if (check_for_login_inactivity(pw_uid, &shpwd)) { 479 error = PAM_PERM_DENIED; 480 goto out; 481 } 482 483 /* 484 * Check to see if the user needs to change their password 485 */ 486 if (error = new_password_check(pw_uid, &shpwd, flags)) { 487 goto out; 488 } 489 490 /* 491 * Check to make sure password aging information is okay 492 */ 493 if ((error = perform_passwd_aging_check(pamh, &shpwd, flags)) 494 != PAM_SUCCESS) { 495 goto out; 496 } 497 498 /* 499 * Finally, warn the user if their password is about to expire. 500 */ 501 if (!(flags & PAM_SILENT)) { 502 warn_user_passwd_will_expire(pamh, shpwd); 503 } 504 505 /* 506 * All done, return Success 507 */ 508 error = PAM_SUCCESS; 509 510 out: 511 512 { 513 int pam_res; 514 unix_authtok_data *authtok_data; 515 516 if (debug) { 517 syslog(LOG_AUTH | LOG_DEBUG, 518 "pam_unix_account: %s: %s", 519 (user == NULL)?"NULL":user, 520 pam_strerror(pamh, error)); 521 } 522 523 if (repository_name) 524 free(repository_name); 525 if (pwu_rep != PWU_DEFAULT_REP) 526 free(pwu_rep); 527 if (shpwd.sp_pwdp) { 528 (void) memset(shpwd.sp_pwdp, 0, strlen(shpwd.sp_pwdp)); 529 free(shpwd.sp_pwdp); 530 } 531 532 /* store the password aging status in the pam handle */ 533 pam_res = pam_get_data( 534 pamh, UNIX_AUTHTOK_DATA, (const void **)&authtok_data); 535 536 if ((status = (unix_authtok_data *)calloc 537 (1, sizeof (unix_authtok_data))) == NULL) { 538 return (PAM_BUF_ERR); 539 } 540 541 if (pam_res == PAM_SUCCESS) 542 (void) memcpy(status, authtok_data, 543 sizeof (unix_authtok_data)); 544 545 status->age_status = error; 546 if (pam_set_data(pamh, UNIX_AUTHTOK_DATA, status, unix_cleanup) 547 != PAM_SUCCESS) { 548 free(status); 549 return (PAM_SERVICE_ERR); 550 } 551 } 552 553 return (error); 554 } 555