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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <syslog.h> 30 #include <dlfcn.h> 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 #include <stdlib.h> 34 #include <strings.h> 35 #include <malloc.h> 36 #include <unistd.h> 37 #include <fcntl.h> 38 #include <errno.h> 39 40 #include <security/pam_appl.h> 41 #include <security/pam_modules.h> 42 #include <sys/mman.h> 43 44 #include <libintl.h> 45 46 #include "pam_impl.h" 47 48 static char *pam_snames [PAM_NUM_MODULE_TYPES] = { 49 PAM_ACCOUNT_NAME, 50 PAM_AUTH_NAME, 51 PAM_PASSWORD_NAME, 52 PAM_SESSION_NAME 53 }; 54 55 static char *pam_inames [PAM_MAX_ITEMS] = { 56 /* NONE */ NULL, 57 /* PAM_SERVICE */ "service", 58 /* PAM_USER */ "user", 59 /* PAM_TTY */ "tty", 60 /* PAM_RHOST */ "rhost", 61 /* PAM_CONV */ "conv", 62 /* PAM_AUTHTOK */ "authtok", 63 /* PAM_OLDAUTHTOK */ "oldauthtok", 64 /* PAM_RUSER */ "ruser", 65 /* PAM_USER_PROMPT */ "user_prompt", 66 /* PAM_REPOSITORY */ "repository", 67 /* PAM_RESOURCE */ "resource", 68 /* Undefined Items */ 69 }; 70 71 /* 72 * This extra definition is needed in order to build this library 73 * on pre-64-bit-aware systems. 74 */ 75 #if !defined(_LFS64_LARGEFILE) 76 #define stat64 stat 77 #endif /* !defined(_LFS64_LARGEFILE) */ 78 79 /* functions to dynamically load modules */ 80 static int load_modules(pam_handle_t *, int, char *, pamtab_t *); 81 static void *open_module(pam_handle_t *, char *); 82 static int load_function(void *, char *, int (**func)()); 83 84 /* functions to read and store the pam.conf configuration file */ 85 static int open_pam_conf(struct pam_fh **, pam_handle_t *, char *); 86 static void close_pam_conf(struct pam_fh *); 87 static int read_pam_conf(pam_handle_t *, char *); 88 static int get_pam_conf_entry(struct pam_fh *, pam_handle_t *, 89 pamtab_t **); 90 static char *read_next_token(char **); 91 static char *nextline(struct pam_fh *); 92 static int verify_pam_conf(pamtab_t *, char *); 93 94 /* functions to clean up and free memory */ 95 static void clean_up(pam_handle_t *); 96 static void free_pamconf(pamtab_t *); 97 static void free_pam_conf_info(pam_handle_t *); 98 static void free_env(env_list *); 99 100 /* convenience functions for I18N/L10N communication */ 101 102 static void free_resp(int, struct pam_response *); 103 static int do_conv(pam_handle_t *, int, int, 104 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE], void *, 105 struct pam_response **); 106 107 static int log_priority; /* pam_trace syslog priority & facility */ 108 static int pam_debug = 0; 109 110 static char * 111 pam_trace_iname(int item_type, char *iname_buf) 112 { 113 char *name; 114 115 /* 116 * XXX -- Contracted Consolidation Private 117 * to be eliminated when dtlogin contract is terminated 118 * Version number requested by PAM's client 119 */ 120 if (item_type == PAM_MSG_VERSION) 121 return ("msg_version"); 122 123 if (item_type <= 0 || 124 item_type >= PAM_MAX_ITEMS || 125 (name = pam_inames[item_type]) == NULL) { 126 (void) sprintf(iname_buf, "%d", item_type); 127 return (iname_buf); 128 } 129 return (name); 130 } 131 132 static char * 133 pam_trace_fname(int flag) 134 { 135 if (flag & PAM_BINDING) 136 return (PAM_BINDING_NAME); 137 if (flag & PAM_INCLUDE) 138 return (PAM_INCLUDE_NAME); 139 if (flag & PAM_OPTIONAL) 140 return (PAM_OPTIONAL_NAME); 141 if (flag & PAM_REQUIRED) 142 return (PAM_REQUIRED_NAME); 143 if (flag & PAM_REQUISITE) 144 return (PAM_REQUISITE_NAME); 145 if (flag & PAM_SUFFICIENT) 146 return (PAM_SUFFICIENT_NAME); 147 return ("bad flag name"); 148 } 149 150 static char * 151 pam_trace_cname(pam_handle_t *pamh) 152 { 153 if (pamh->pam_conf_name[pamh->include_depth] == NULL) 154 return ("NULL"); 155 return (pamh->pam_conf_name[pamh->include_depth]); 156 } 157 158 #include <deflt.h> 159 #include <stdarg.h> 160 /* 161 * pam_settrace - setup configuration for pam tracing 162 * 163 * turn on PAM debug if "magic" file exists 164 * if exists (original), pam_debug = PAM_DEBUG_DEFAULT, 165 * log_priority = LOG_DEBUG(7) and log_facility = LOG_AUTH(4). 166 * 167 * if has contents, keywork=value pairs: 168 * 169 * "log_priority=" 0-7, the pam_trace syslog priority to use 170 * (see sys/syslog.h) 171 * "log_facility=" 0-23, the pam_trace syslog facility to use 172 * (see sys/syslog.h) 173 * "debug_flags=" PAM_DEBUG_DEFAULT (0x0001), log traditional 174 * (original) debugging. 175 * Plus the logical or of: 176 * PAM_DEBUG_ITEM (0x0002), log item values and 177 * pam_get_item. 178 * PAM_DEBUG_MODULE (0x0004), log module return status. 179 * PAM_DEBUG_CONF (0x0008), log pam.conf parsing. 180 * PAM_DEBUG_DATA (0x0010), get/set_data. 181 * PAM_DEBUG_CONV (0x0020), conversation/response. 182 * 183 * If compiled with DEBUG: 184 * PAM_DEBUG_AUTHTOK (0x8000), display AUTHTOK value if 185 * PAM_DEBUG_ITEM is set and results from 186 * PAM_PROMPT_ECHO_OFF responses. 187 * USE CAREFULLY, THIS EXPOSES THE USER'S PASSWORDS. 188 * 189 * or set to 0 and off even if PAM_DEBUG file exists. 190 * 191 * Output has the general form: 192 * <whatever was set syslog> PAM[<pid>]: <interface>(<handle> and other info) 193 * <whatever was set syslog> PAM[<pid>]: details requested for <interface> call 194 * Where: <pid> is the process ID of the calling process. 195 * <handle> is the Hex value of the pam_handle associated with the 196 * call. 197 */ 198 199 static void 200 pam_settrace() 201 { 202 if (defopen(PAM_DEBUG) == 0) { 203 char *arg; 204 int code; 205 int facility = LOG_AUTH; 206 207 pam_debug = PAM_DEBUG_DEFAULT; 208 log_priority = LOG_DEBUG; 209 210 (void) defcntl(DC_SETFLAGS, DC_CASE); 211 if ((arg = defread(LOG_PRIORITY)) != NULL) { 212 code = (int)strtol(arg, NULL, 10); 213 if ((code & ~LOG_PRIMASK) == 0) { 214 log_priority = code; 215 } 216 } 217 if ((arg = defread(LOG_FACILITY)) != NULL) { 218 code = (int)strtol(arg, NULL, 10); 219 if (code < LOG_NFACILITIES) { 220 facility = code << 3; 221 } 222 } 223 if ((arg = defread(DEBUG_FLAGS)) != NULL) { 224 pam_debug = (int)strtol(arg, NULL, 0); 225 } 226 (void) defopen(NULL); /* close */ 227 228 log_priority |= facility; 229 } 230 } 231 232 /* 233 * pam_trace - logs tracing messages 234 * 235 * flag = debug_flags from /etc/pam_debug 236 * format and args = message to print (PAM[<pid>]: is prepended). 237 * 238 * global log_priority = pam_trace syslog (log_priority | log_facility) 239 * from /etc/pam_debug 240 */ 241 /*PRINTFLIKE2*/ 242 static void 243 pam_trace(int flag, char *format, ...) 244 { 245 va_list args; 246 char message[1024]; 247 int savemask; 248 249 if ((pam_debug & flag) == 0) 250 return; 251 252 savemask = setlogmask(LOG_MASK(log_priority & LOG_PRIMASK)); 253 (void) snprintf(message, sizeof (message), "PAM[%ld]: %s", 254 (long)getpid(), format); 255 va_start(args, format); 256 (void) vsyslog(log_priority, message, args); 257 va_end(args); 258 (void) setlogmask(savemask); 259 } 260 261 /* 262 * __pam_log - logs PAM syslog messages 263 * 264 * priority = message priority 265 * format and args = message to log 266 */ 267 /*PRINTFLIKE2*/ 268 void 269 __pam_log(int priority, const char *format, ...) 270 { 271 va_list args; 272 int savemask = setlogmask(LOG_MASK(priority & LOG_PRIMASK)); 273 274 va_start(args, format); 275 (void) vsyslog(priority, format, args); 276 va_end(args); 277 (void) setlogmask(savemask); 278 } 279 280 281 /* 282 * pam_XXXXX routines 283 * 284 * These are the entry points to the authentication switch 285 */ 286 287 /* 288 * pam_start - initiate an authentication transaction and 289 * set parameter values to be used during the 290 * transaction 291 */ 292 293 int 294 pam_start(const char *service, const char *user, 295 const struct pam_conv *pam_conv, pam_handle_t **pamh) 296 { 297 int err; 298 299 *pamh = (struct pam_handle *)calloc(1, sizeof (struct pam_handle)); 300 301 pam_settrace(); 302 pam_trace(PAM_DEBUG_DEFAULT, 303 "pam_start(%s,%s,%p:%p) - debug = %x", 304 service ? service : "NULL", user ? user : "NULL", (void *)pam_conv, 305 (void *)*pamh, pam_debug); 306 307 if (*pamh == NULL) 308 return (PAM_BUF_ERR); 309 310 (*pamh)->pam_inmodule = RO_OK; /* OK to set RO items */ 311 if ((err = pam_set_item(*pamh, PAM_SERVICE, (void *)service)) 312 != PAM_SUCCESS) { 313 clean_up(*pamh); 314 *pamh = NULL; 315 return (err); 316 } 317 318 if ((err = pam_set_item(*pamh, PAM_USER, (void *)user)) 319 != PAM_SUCCESS) { 320 clean_up(*pamh); 321 *pamh = NULL; 322 return (err); 323 } 324 325 if ((err = pam_set_item(*pamh, PAM_CONV, (void *)pam_conv)) 326 != PAM_SUCCESS) { 327 clean_up(*pamh); 328 *pamh = NULL; 329 return (err); 330 } 331 332 (*pamh)->pam_inmodule = RW_OK; 333 return (PAM_SUCCESS); 334 } 335 336 /* 337 * pam_end - terminate an authentication transaction 338 */ 339 340 int 341 pam_end(pam_handle_t *pamh, int pam_status) 342 { 343 struct pam_module_data *psd, *p; 344 fd_list *expired; 345 fd_list *traverse; 346 env_list *env_expired; 347 env_list *env_traverse; 348 349 pam_trace(PAM_DEBUG_DEFAULT, 350 "pam_end(%p): status = %s", (void *)pamh, 351 pam_strerror(pamh, pam_status)); 352 353 if (pamh == NULL) 354 return (PAM_SYSTEM_ERR); 355 356 /* call the cleanup routines for module specific data */ 357 358 psd = pamh->ssd; 359 while (psd) { 360 if (psd->cleanup) { 361 psd->cleanup(pamh, psd->data, pam_status); 362 } 363 p = psd; 364 psd = p->next; 365 free(p->module_data_name); 366 free(p); 367 } 368 pamh->ssd = NULL; 369 370 /* dlclose all module fds */ 371 traverse = pamh->fd; 372 while (traverse) { 373 expired = traverse; 374 traverse = traverse->next; 375 (void) dlclose(expired->mh); 376 free(expired); 377 } 378 pamh->fd = 0; 379 380 /* remove all environment variables */ 381 env_traverse = pamh->pam_env; 382 while (env_traverse) { 383 env_expired = env_traverse; 384 env_traverse = env_traverse->next; 385 free_env(env_expired); 386 } 387 388 clean_up(pamh); 389 return (PAM_SUCCESS); 390 } 391 392 /* 393 * pam_set_item - set the value of a parameter that can be 394 * retrieved via a call to pam_get_item() 395 */ 396 397 int 398 pam_set_item(pam_handle_t *pamh, int item_type, const void *item) 399 { 400 struct pam_item *pip; 401 int size; 402 char iname_buf[PAM_MAX_MSG_SIZE]; 403 404 if (((pam_debug & PAM_DEBUG_ITEM) == 0) || (pamh == NULL)) { 405 pam_trace(PAM_DEBUG_DEFAULT, 406 "pam_set_item(%p:%s)", (void *)pamh, 407 pam_trace_iname(item_type, iname_buf)); 408 } 409 410 if (pamh == NULL) 411 return (PAM_SYSTEM_ERR); 412 413 /* check read only items */ 414 if ((item_type == PAM_SERVICE) && (pamh->pam_inmodule != RO_OK)) 415 return (PAM_PERM_DENIED); 416 417 /* 418 * XXX -- Contracted Consolidation Private 419 * to be eliminated when dtlogin contract is terminated 420 * Check if tag is Sun proprietary 421 */ 422 if (item_type == PAM_MSG_VERSION) { 423 if (pamh->pam_client_message_version_number) 424 free(pamh->pam_client_message_version_number); 425 426 if (item == NULL) 427 pamh->pam_client_message_version_number = NULL; 428 else 429 if ((pamh->pam_client_message_version_number = 430 strdup((char *)item)) == NULL) 431 return (PAM_BUF_ERR); 432 433 pam_trace(PAM_DEBUG_ITEM, 434 "pam_set_item(%p:%s)=%s", (void *)pamh, 435 pam_trace_iname(item_type, iname_buf), 436 item ? (char *)item : "NULL"); 437 return (PAM_SUCCESS); 438 } 439 440 /* 441 * Check that item_type is within valid range 442 */ 443 444 if (item_type <= 0 || item_type >= PAM_MAX_ITEMS) 445 return (PAM_SYMBOL_ERR); 446 447 pip = &(pamh->ps_item[item_type]); 448 449 switch (item_type) { 450 case PAM_AUTHTOK: 451 case PAM_OLDAUTHTOK: 452 if (pip->pi_addr != NULL) 453 (void) memset(pip->pi_addr, 0, pip->pi_size); 454 /*FALLTHROUGH*/ 455 case PAM_SERVICE: 456 case PAM_USER: 457 case PAM_TTY: 458 case PAM_RHOST: 459 case PAM_RUSER: 460 case PAM_USER_PROMPT: 461 case PAM_RESOURCE: 462 if (pip->pi_addr != NULL) { 463 free(pip->pi_addr); 464 } 465 466 if (item == NULL) { 467 pip->pi_addr = NULL; 468 pip->pi_size = 0; 469 } else { 470 pip->pi_addr = strdup((char *)item); 471 if (pip->pi_addr == NULL) { 472 pip->pi_size = 0; 473 return (PAM_BUF_ERR); 474 } 475 pip->pi_size = strlen(pip->pi_addr); 476 } 477 break; 478 case PAM_CONV: 479 if (pip->pi_addr != NULL) 480 free(pip->pi_addr); 481 size = sizeof (struct pam_conv); 482 if ((pip->pi_addr = (void *)calloc(1, size)) == NULL) 483 return (PAM_BUF_ERR); 484 if (item != NULL) 485 (void) memcpy(pip->pi_addr, item, (unsigned int) size); 486 else 487 (void) memset(pip->pi_addr, 0, size); 488 pip->pi_size = size; 489 break; 490 case PAM_REPOSITORY: 491 if (pip->pi_addr != NULL) { 492 pam_repository_t *auth_rep; 493 494 auth_rep = (pam_repository_t *)pip->pi_addr; 495 if (auth_rep->type != NULL) 496 free(auth_rep->type); 497 if (auth_rep->scope != NULL) 498 free(auth_rep->scope); 499 free(auth_rep); 500 } 501 if (item != NULL) { 502 pam_repository_t *s, *d; 503 504 size = sizeof (struct pam_repository); 505 pip->pi_addr = (void *)calloc(1, size); 506 if (pip->pi_addr == NULL) 507 return (PAM_BUF_ERR); 508 509 s = (struct pam_repository *)item; 510 d = (struct pam_repository *)pip->pi_addr; 511 512 d->type = strdup(s->type); 513 if (d->type == NULL) 514 return (PAM_BUF_ERR); 515 d->scope = malloc(s->scope_len); 516 if (d->scope == NULL) 517 return (PAM_BUF_ERR); 518 (void) memcpy(d->scope, s->scope, s->scope_len); 519 d->scope_len = s->scope_len; 520 } 521 pip->pi_size = size; 522 break; 523 default: 524 return (PAM_SYMBOL_ERR); 525 } 526 switch (item_type) { 527 case PAM_CONV: 528 pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%p", 529 (void *)pamh, 530 pam_trace_iname(item_type, iname_buf), 531 item ? (void *)((struct pam_conv *)item)->conv : 532 (void *)0); 533 break; 534 case PAM_REPOSITORY: 535 pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", 536 (void *)pamh, 537 pam_trace_iname(item_type, iname_buf), 538 item ? (((struct pam_repository *)item)->type ? 539 ((struct pam_repository *)item)->type : "NULL") : 540 "NULL"); 541 break; 542 case PAM_AUTHTOK: 543 case PAM_OLDAUTHTOK: 544 #ifdef DEBUG 545 if (pam_debug & PAM_DEBUG_AUTHTOK) 546 pam_trace(PAM_DEBUG_ITEM, 547 "pam_set_item(%p:%s)=%s", (void *)pamh, 548 pam_trace_iname(item_type, iname_buf), 549 item ? (char *)item : "NULL"); 550 else 551 #endif /* DEBUG */ 552 pam_trace(PAM_DEBUG_ITEM, 553 "pam_set_item(%p:%s)=%s", (void *)pamh, 554 pam_trace_iname(item_type, iname_buf), 555 item ? "********" : "NULL"); 556 break; 557 default: 558 pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", 559 (void *)pamh, 560 pam_trace_iname(item_type, iname_buf), 561 item ? (char *)item : "NULL"); 562 } 563 564 return (PAM_SUCCESS); 565 } 566 567 /* 568 * pam_get_item - read the value of a parameter specified in 569 * the call to pam_set_item() 570 */ 571 572 int 573 pam_get_item(const pam_handle_t *pamh, int item_type, void **item) 574 { 575 struct pam_item *pip; 576 char iname_buf[PAM_MAX_MSG_SIZE]; 577 578 if (((pam_debug & PAM_DEBUG_ITEM) == 0) || (pamh == NULL)) { 579 pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)", 580 (void *)pamh, pam_trace_iname(item_type, iname_buf)); 581 } 582 583 if (pamh == NULL) 584 return (PAM_SYSTEM_ERR); 585 586 /* 587 * XXX -- Contracted Consolidation Private 588 * to be eliminated when dtlogin contract is terminated 589 * Check if tag is Sun proprietary 590 */ 591 if (item_type == PAM_MSG_VERSION) { 592 *item = pamh->pam_client_message_version_number; 593 pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", 594 (void *)pamh, pam_trace_iname(item_type, iname_buf), 595 *item ? (char *)*item : "NULL"); 596 return (PAM_SUCCESS); 597 } 598 599 if (item_type <= 0 || item_type >= PAM_MAX_ITEMS) 600 return (PAM_SYMBOL_ERR); 601 602 if ((pamh->pam_inmodule != WO_OK) && 603 ((item_type == PAM_AUTHTOK || item_type == PAM_OLDAUTHTOK))) { 604 __pam_log(LOG_AUTH | LOG_NOTICE, "pam_get_item(%s) called from " 605 "a non module context", 606 pam_trace_iname(item_type, iname_buf)); 607 return (PAM_PERM_DENIED); 608 } 609 610 pip = (struct pam_item *)&(pamh->ps_item[item_type]); 611 612 *item = pip->pi_addr; 613 switch (item_type) { 614 case PAM_CONV: 615 pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%p", 616 (void *)pamh, 617 pam_trace_iname(item_type, iname_buf), 618 (void *)((struct pam_conv *)*item)->conv); 619 break; 620 case PAM_REPOSITORY: 621 pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", 622 (void *)pamh, 623 pam_trace_iname(item_type, iname_buf), 624 *item ? (((struct pam_repository *)*item)->type ? 625 ((struct pam_repository *)*item)->type : "NULL") : 626 "NULL"); 627 break; 628 case PAM_AUTHTOK: 629 case PAM_OLDAUTHTOK: 630 #ifdef DEBUG 631 if (pam_debug & PAM_DEBUG_AUTHTOK) 632 pam_trace(PAM_DEBUG_ITEM, 633 "pam_get_item(%p:%s)=%s", (void *)pamh, 634 pam_trace_iname(item_type, iname_buf), 635 *item ? *(char **)item : "NULL"); 636 else 637 #endif /* DEBUG */ 638 pam_trace(PAM_DEBUG_ITEM, 639 "pam_get_item(%p:%s)=%s", (void *)pamh, 640 pam_trace_iname(item_type, iname_buf), 641 *item ? "********" : "NULL"); 642 break; 643 default: 644 pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", 645 (void *)pamh, 646 pam_trace_iname(item_type, iname_buf), 647 *item ? *(char **)item : "NULL"); 648 } 649 650 return (PAM_SUCCESS); 651 } 652 653 /* 654 * parse_user_name - process the user response: ignore 655 * '\t' or ' ' before or after a user name. 656 * user_input is a null terminated string. 657 * *ret_username will be the user name. 658 */ 659 660 static int 661 parse_user_name(char *user_input, char **ret_username) 662 { 663 register char *ptr; 664 register int index = 0; 665 char username[PAM_MAX_RESP_SIZE]; 666 667 /* Set the default value for *ret_username */ 668 *ret_username = NULL; 669 670 /* 671 * Set the initial value for username - this is a buffer holds 672 * the user name. 673 */ 674 bzero((void *)username, PAM_MAX_RESP_SIZE); 675 676 /* 677 * The user_input is guaranteed to be terminated by a null character. 678 */ 679 ptr = user_input; 680 681 /* Skip all the leading whitespaces if there are any. */ 682 while ((*ptr == ' ') || (*ptr == '\t')) 683 ptr++; 684 685 if (*ptr == '\0') { 686 /* 687 * We should never get here since the user_input we got 688 * in pam_get_user() is not all whitespaces nor just "\0". 689 */ 690 return (PAM_BUF_ERR); 691 } 692 693 /* 694 * username will be the first string we get from user_input 695 * - we skip leading whitespaces and ignore trailing whitespaces 696 */ 697 while (*ptr != '\0') { 698 if ((*ptr == ' ') || (*ptr == '\t')) 699 break; 700 else { 701 username[index] = *ptr; 702 index++; 703 ptr++; 704 } 705 } 706 707 /* ret_username will be freed in pam_get_user(). */ 708 if ((*ret_username = (char *)malloc((index + 1)*(sizeof (char)))) 709 == NULL) 710 return (PAM_BUF_ERR); 711 (void) strcpy(*ret_username, username); 712 return (PAM_SUCCESS); 713 } 714 715 /* 716 * Get the value of PAM_USER. If not set, then use the convenience function 717 * to prompt for the user. Use prompt if specified, else use PAM_USER_PROMPT 718 * if it is set, else use default. 719 */ 720 #define WHITESPACE 0 721 #define USERNAME 1 722 723 int 724 pam_get_user(pam_handle_t *pamh, char **user, const char *prompt_override) 725 { 726 int status; 727 char *prompt = NULL; 728 char *real_username; 729 730 struct pam_response *ret_resp = NULL; 731 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; 732 733 pam_trace(PAM_DEBUG_DEFAULT, 734 "pam_get_user(%p, %p, %s)", (void *)pamh, (void *)*user, 735 prompt_override ? prompt_override : "NULL"); 736 if (pamh == NULL) 737 return (PAM_SYSTEM_ERR); 738 739 if ((status = pam_get_item(pamh, PAM_USER, (void **)user)) 740 != PAM_SUCCESS) { 741 return (status); 742 } 743 744 /* if the user is set, return it */ 745 746 if (*user != NULL && *user[0] != '\0') { 747 return (PAM_SUCCESS); 748 } 749 750 /* 751 * if the module is requesting a special prompt, use it. 752 * else use PAM_USER_PROMPT. 753 */ 754 755 if (prompt_override != NULL) { 756 prompt = (char *)prompt_override; 757 } else { 758 status = pam_get_item(pamh, PAM_USER_PROMPT, (void**)&prompt); 759 if (status != PAM_SUCCESS) { 760 return (status); 761 } 762 } 763 764 /* if the prompt is not set, use default */ 765 766 if (prompt == NULL || prompt[0] == '\0') { 767 prompt = dgettext(TEXT_DOMAIN, "Please enter user name: "); 768 } 769 770 /* prompt for the user */ 771 772 (void) strncpy(messages[0], prompt, sizeof (messages[0])); 773 774 for (;;) { 775 int state = WHITESPACE; 776 777 status = do_conv(pamh, PAM_PROMPT_ECHO_ON, 1, messages, 778 NULL, &ret_resp); 779 780 if (status != PAM_SUCCESS) { 781 return (status); 782 } 783 784 if (ret_resp->resp && ret_resp->resp[0] != '\0') { 785 int len = strlen(ret_resp->resp); 786 int i; 787 788 for (i = 0; i < len; i++) { 789 if ((ret_resp->resp[i] != ' ') && 790 (ret_resp->resp[i] != '\t')) { 791 state = USERNAME; 792 break; 793 } 794 } 795 796 if (state == USERNAME) 797 break; 798 } 799 } 800 801 /* set PAM_USER */ 802 /* Parse the user input to get the user name. */ 803 status = parse_user_name(ret_resp->resp, &real_username); 804 805 if (status != PAM_SUCCESS) { 806 if (real_username != NULL) 807 free(real_username); 808 free_resp(1, ret_resp); 809 return (status); 810 } 811 812 status = pam_set_item(pamh, PAM_USER, real_username); 813 814 free(real_username); 815 816 free_resp(1, ret_resp); 817 if (status != PAM_SUCCESS) { 818 return (status); 819 } 820 821 /* 822 * finally, get PAM_USER. We have to call pam_get_item to get 823 * the value of user because pam_set_item mallocs the memory. 824 */ 825 826 status = pam_get_item(pamh, PAM_USER, (void**)user); 827 return (status); 828 } 829 830 /* 831 * Set module specific data 832 */ 833 834 int 835 pam_set_data(pam_handle_t *pamh, const char *module_data_name, void *data, 836 void (*cleanup)(pam_handle_t *pamh, void *data, int pam_end_status)) 837 { 838 struct pam_module_data *psd; 839 840 pam_trace(PAM_DEBUG_DATA, 841 "pam_set_data(%p:%s:%d)=%p", (void *)pamh, 842 module_data_name ? module_data_name : "NULL", pamh->pam_inmodule, 843 data); 844 if (pamh == NULL || (pamh->pam_inmodule != WO_OK) || 845 module_data_name == NULL) { 846 return (PAM_SYSTEM_ERR); 847 } 848 849 /* check if module data already exists */ 850 851 for (psd = pamh->ssd; psd; psd = psd->next) { 852 if (strcmp(psd->module_data_name, module_data_name) == 0) { 853 /* clean up original data before setting the new data */ 854 if (psd->cleanup) { 855 psd->cleanup(pamh, psd->data, PAM_SUCCESS); 856 } 857 psd->data = (void *)data; 858 psd->cleanup = cleanup; 859 return (PAM_SUCCESS); 860 } 861 } 862 863 psd = malloc(sizeof (struct pam_module_data)); 864 if (psd == NULL) 865 return (PAM_BUF_ERR); 866 867 psd->module_data_name = strdup(module_data_name); 868 if (psd->module_data_name == NULL) { 869 free(psd); 870 return (PAM_BUF_ERR); 871 } 872 873 psd->data = (void *)data; 874 psd->cleanup = cleanup; 875 psd->next = pamh->ssd; 876 pamh->ssd = psd; 877 return (PAM_SUCCESS); 878 } 879 880 /* 881 * get module specific data 882 */ 883 884 int 885 pam_get_data(const pam_handle_t *pamh, const char *module_data_name, 886 const void **data) 887 { 888 struct pam_module_data *psd; 889 890 if (pamh == NULL || (pamh->pam_inmodule != WO_OK) || 891 module_data_name == NULL) { 892 pam_trace(PAM_DEBUG_DATA, 893 "pam_get_data(%p:%s:%d)=%p", (void *)pamh, 894 module_data_name ? module_data_name : "NULL", 895 pamh->pam_inmodule, *data); 896 return (PAM_SYSTEM_ERR); 897 } 898 899 for (psd = pamh->ssd; psd; psd = psd->next) { 900 if (strcmp(psd->module_data_name, module_data_name) == 0) { 901 *data = psd->data; 902 pam_trace(PAM_DEBUG_DATA, 903 "pam_get_data(%p:%s)=%p", (void *)pamh, 904 module_data_name, *data); 905 return (PAM_SUCCESS); 906 } 907 } 908 pam_trace(PAM_DEBUG_DATA, 909 "pam_get_data(%p:%s)=%s", (void *)pamh, module_data_name, 910 "PAM_NO_MODULE_DATA"); 911 912 return (PAM_NO_MODULE_DATA); 913 } 914 915 /* 916 * PAM equivalent to strerror() 917 */ 918 /* ARGSUSED */ 919 const char * 920 pam_strerror(pam_handle_t *pamh, int errnum) 921 { 922 switch (errnum) { 923 case PAM_SUCCESS: 924 return (dgettext(TEXT_DOMAIN, "Success")); 925 case PAM_OPEN_ERR: 926 return (dgettext(TEXT_DOMAIN, "Dlopen failure")); 927 case PAM_SYMBOL_ERR: 928 return (dgettext(TEXT_DOMAIN, "Symbol not found")); 929 case PAM_SERVICE_ERR: 930 return (dgettext(TEXT_DOMAIN, 931 "Error in underlying service module")); 932 case PAM_SYSTEM_ERR: 933 return (dgettext(TEXT_DOMAIN, "System error")); 934 case PAM_BUF_ERR: 935 return (dgettext(TEXT_DOMAIN, "Memory buffer error")); 936 case PAM_CONV_ERR: 937 return (dgettext(TEXT_DOMAIN, "Conversation failure")); 938 case PAM_PERM_DENIED: 939 return (dgettext(TEXT_DOMAIN, "Permission denied")); 940 case PAM_MAXTRIES: 941 return (dgettext(TEXT_DOMAIN, 942 "Maximum number of attempts exceeded")); 943 case PAM_AUTH_ERR: 944 return (dgettext(TEXT_DOMAIN, "Authentication failed")); 945 case PAM_NEW_AUTHTOK_REQD: 946 return (dgettext(TEXT_DOMAIN, "Get new authentication token")); 947 case PAM_CRED_INSUFFICIENT: 948 return (dgettext(TEXT_DOMAIN, "Insufficient credentials")); 949 case PAM_AUTHINFO_UNAVAIL: 950 return (dgettext(TEXT_DOMAIN, 951 "Can not retrieve authentication info")); 952 case PAM_USER_UNKNOWN: 953 return (dgettext(TEXT_DOMAIN, "No account present for user")); 954 case PAM_CRED_UNAVAIL: 955 return (dgettext(TEXT_DOMAIN, 956 "Can not retrieve user credentials")); 957 case PAM_CRED_EXPIRED: 958 return (dgettext(TEXT_DOMAIN, 959 "User credentials have expired")); 960 case PAM_CRED_ERR: 961 return (dgettext(TEXT_DOMAIN, 962 "Failure setting user credentials")); 963 case PAM_ACCT_EXPIRED: 964 return (dgettext(TEXT_DOMAIN, "User account has expired")); 965 case PAM_AUTHTOK_EXPIRED: 966 return (dgettext(TEXT_DOMAIN, "User password has expired")); 967 case PAM_SESSION_ERR: 968 return (dgettext(TEXT_DOMAIN, 969 "Can not make/remove entry for session")); 970 case PAM_AUTHTOK_ERR: 971 return (dgettext(TEXT_DOMAIN, 972 "Authentication token manipulation error")); 973 case PAM_AUTHTOK_RECOVERY_ERR: 974 return (dgettext(TEXT_DOMAIN, 975 "Authentication token can not be recovered")); 976 case PAM_AUTHTOK_LOCK_BUSY: 977 return (dgettext(TEXT_DOMAIN, 978 "Authentication token lock busy")); 979 case PAM_AUTHTOK_DISABLE_AGING: 980 return (dgettext(TEXT_DOMAIN, 981 "Authentication token aging disabled")); 982 case PAM_NO_MODULE_DATA: 983 return (dgettext(TEXT_DOMAIN, 984 "Module specific data not found")); 985 case PAM_IGNORE: 986 return (dgettext(TEXT_DOMAIN, "Ignore module")); 987 case PAM_ABORT: 988 return (dgettext(TEXT_DOMAIN, "General PAM failure ")); 989 case PAM_TRY_AGAIN: 990 return (dgettext(TEXT_DOMAIN, 991 "Unable to complete operation. Try again")); 992 default: 993 return (dgettext(TEXT_DOMAIN, "Unknown error")); 994 } 995 } 996 997 static void * 998 sm_name(int ind) 999 { 1000 switch (ind) { 1001 case PAM_AUTHENTICATE: 1002 return (PAM_SM_AUTHENTICATE); 1003 case PAM_SETCRED: 1004 return (PAM_SM_SETCRED); 1005 case PAM_ACCT_MGMT: 1006 return (PAM_SM_ACCT_MGMT); 1007 case PAM_OPEN_SESSION: 1008 return (PAM_SM_OPEN_SESSION); 1009 case PAM_CLOSE_SESSION: 1010 return (PAM_SM_CLOSE_SESSION); 1011 case PAM_CHAUTHTOK: 1012 return (PAM_SM_CHAUTHTOK); 1013 } 1014 return (NULL); 1015 } 1016 1017 static int 1018 (*func(pamtab_t *modulep, int ind))() 1019 { 1020 void *funcp; 1021 1022 if ((funcp = modulep->function_ptr) == NULL) 1023 return (NULL); 1024 1025 switch (ind) { 1026 case PAM_AUTHENTICATE: 1027 return (((struct auth_module *)funcp)->pam_sm_authenticate); 1028 case PAM_SETCRED: 1029 return (((struct auth_module *)funcp)->pam_sm_setcred); 1030 case PAM_ACCT_MGMT: 1031 return (((struct account_module *)funcp)->pam_sm_acct_mgmt); 1032 case PAM_OPEN_SESSION: 1033 return (((struct session_module *)funcp)->pam_sm_open_session); 1034 case PAM_CLOSE_SESSION: 1035 return (((struct session_module *)funcp)->pam_sm_close_session); 1036 case PAM_CHAUTHTOK: 1037 return (((struct password_module *)funcp)->pam_sm_chauthtok); 1038 } 1039 return (NULL); 1040 } 1041 1042 /* 1043 * Run through the PAM service module stack for the given module type. 1044 */ 1045 static int 1046 run_stack(pam_handle_t *pamh, int flags, int type, int def_err, int ind, 1047 char *function_name) 1048 { 1049 int err = PAM_SYSTEM_ERR; /* preset */ 1050 int optional_error = 0; 1051 int required_error = 0; 1052 int success = 0; 1053 pamtab_t *modulep; 1054 int (*sm_func)(); 1055 1056 if (pamh == NULL) 1057 return (PAM_SYSTEM_ERR); 1058 1059 /* read initial entries from pam.conf */ 1060 if ((err = read_pam_conf(pamh, PAM_CONFIG)) != PAM_SUCCESS) { 1061 return (err); 1062 } 1063 1064 if ((modulep = 1065 pamh->pam_conf_info[pamh->include_depth][type]) == NULL) { 1066 __pam_log(LOG_AUTH | LOG_ERR, "%s no initial module present", 1067 pam_trace_cname(pamh)); 1068 goto exit_return; 1069 } 1070 1071 pamh->pam_inmodule = WO_OK; /* OK to get AUTHTOK */ 1072 include: 1073 pam_trace(PAM_DEBUG_MODULE, 1074 "[%d:%s]:run_stack:%s(%p, %x): %s", pamh->include_depth, 1075 pam_trace_cname(pamh), function_name, (void *)pamh, flags, 1076 modulep ? modulep->module_path : "NULL"); 1077 1078 while (modulep != NULL) { 1079 if (modulep->pam_flag & PAM_INCLUDE) { 1080 /* save the return location */ 1081 pamh->pam_conf_modulep[pamh->include_depth] = 1082 modulep->next; 1083 pam_trace(PAM_DEBUG_MODULE, 1084 "setting for include[%d:%p]", 1085 pamh->include_depth, (void *)modulep->next); 1086 if (pamh->include_depth++ >= PAM_MAX_INCLUDE) { 1087 __pam_log(LOG_AUTH | LOG_ERR, 1088 "run_stack: includes too deep %d " 1089 "found trying to include %s from %s, %d " 1090 "allowed", pamh->include_depth, 1091 modulep->module_path, pamh->pam_conf_name 1092 [PAM_MAX_INCLUDE] == NULL ? "NULL" : 1093 pamh->pam_conf_name[PAM_MAX_INCLUDE], 1094 PAM_MAX_INCLUDE); 1095 goto exit_return; 1096 } 1097 if ((err = read_pam_conf(pamh, 1098 modulep->module_path)) != PAM_SUCCESS) { 1099 __pam_log(LOG_AUTH | LOG_ERR, 1100 "run_stack[%d:%s]: can't read included " 1101 "conf %s", pamh->include_depth, 1102 pam_trace_cname(pamh), 1103 modulep->module_path); 1104 goto exit_return; 1105 } 1106 if ((modulep = pamh->pam_conf_info 1107 [pamh->include_depth][type]) == NULL) { 1108 __pam_log(LOG_AUTH | LOG_ERR, 1109 "run_stack[%d:%s]: no include module " 1110 "present %s", pamh->include_depth, 1111 pam_trace_cname(pamh), function_name); 1112 goto exit_return; 1113 } 1114 if (modulep->pam_flag & PAM_INCLUDE) { 1115 /* first line another include */ 1116 goto include; 1117 } 1118 pam_trace(PAM_DEBUG_DEFAULT, "include[%d:%s]" 1119 "(%p, %s)=%s", pamh->include_depth, 1120 pam_trace_cname(pamh), (void *)pamh, 1121 function_name, modulep->module_path); 1122 if ((err = load_modules(pamh, type, sm_name(ind), 1123 pamh->pam_conf_info 1124 [pamh->include_depth][type])) != PAM_SUCCESS) { 1125 pam_trace(PAM_DEBUG_DEFAULT, 1126 "[%d:%s]:%s(%p, %x): load_modules failed", 1127 pamh->include_depth, pam_trace_cname(pamh), 1128 function_name, (void *)pamh, flags); 1129 goto exit_return; 1130 } 1131 if ((modulep = pamh->pam_conf_info 1132 [pamh->include_depth][type]) == NULL) { 1133 __pam_log(LOG_AUTH | LOG_ERR, 1134 "%s no initial module present", 1135 pam_trace_cname(pamh)); 1136 goto exit_return; 1137 } 1138 } else if ((err = load_modules(pamh, type, sm_name(ind), 1139 modulep)) != PAM_SUCCESS) { 1140 pam_trace(PAM_DEBUG_DEFAULT, 1141 "[%d:%s]:%s(%p, %x): load_modules failed", 1142 pamh->include_depth, pam_trace_cname(pamh), 1143 function_name, (void *)pamh, flags); 1144 goto exit_return; 1145 } /* PAM_INCLUDE */ 1146 sm_func = func(modulep, ind); 1147 if (sm_func) { 1148 err = sm_func(pamh, flags, modulep->module_argc, 1149 (const char **)modulep->module_argv); 1150 1151 pam_trace(PAM_DEBUG_MODULE, 1152 "[%d:%s]:%s(%p, %x): %s returned %s", 1153 pamh->include_depth, pam_trace_cname(pamh), 1154 function_name, (void *)pamh, flags, 1155 modulep->module_path, pam_strerror(pamh, err)); 1156 1157 switch (err) { 1158 case PAM_IGNORE: 1159 /* do nothing */ 1160 break; 1161 case PAM_SUCCESS: 1162 if ((modulep->pam_flag & PAM_SUFFI_BIND) && 1163 !required_error) { 1164 pamh->pam_inmodule = RW_OK; 1165 pam_trace(PAM_DEBUG_MODULE, 1166 "[%d:%s]:%s(%p, %x): %s: success", 1167 pamh->include_depth, 1168 pam_trace_cname(pamh), 1169 function_name, (void *)pamh, flags, 1170 (modulep->pam_flag & PAM_BINDING) ? 1171 PAM_BINDING_NAME : 1172 PAM_SUFFICIENT_NAME); 1173 goto exit_return; 1174 } 1175 success = 1; 1176 break; 1177 case PAM_TRY_AGAIN: 1178 /* 1179 * We need to return immediately, and 1180 * we shouldn't reset the AUTHTOK item 1181 * since it is not an error per-se. 1182 */ 1183 pamh->pam_inmodule = RW_OK; 1184 pam_trace(PAM_DEBUG_MODULE, 1185 "[%d:%s]:%s(%p, %x): TRY_AGAIN: %s", 1186 pamh->include_depth, pam_trace_cname(pamh), 1187 function_name, (void *)pamh, flags, 1188 pam_strerror(pamh, required_error ? 1189 required_error : err)); 1190 err = required_error ? required_error : err; 1191 goto exit_return; 1192 default: 1193 if (modulep->pam_flag & PAM_REQUISITE) { 1194 pamh->pam_inmodule = RW_OK; 1195 pam_trace(PAM_DEBUG_MODULE, 1196 "[%d:%s]:%s(%p, %x): requisite: %s", 1197 pamh->include_depth, 1198 pam_trace_cname(pamh), 1199 function_name, (void *)pamh, flags, 1200 pam_strerror(pamh, 1201 required_error ? required_error : 1202 err)); 1203 err = required_error ? 1204 required_error : err; 1205 goto exit_return; 1206 } else if (modulep->pam_flag & PAM_REQRD_BIND) { 1207 if (!required_error) 1208 required_error = err; 1209 } else { 1210 if (!optional_error) 1211 optional_error = err; 1212 } 1213 pam_trace(PAM_DEBUG_DEFAULT, 1214 "[%d:%s]:%s(%p, %x): error %s", 1215 pamh->include_depth, pam_trace_cname(pamh), 1216 function_name, (void *)pamh, flags, 1217 pam_strerror(pamh, err)); 1218 break; 1219 } 1220 } 1221 modulep = modulep->next; 1222 } 1223 1224 pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:stack_end:%s(%p, %x): %s %s: %s", 1225 pamh->include_depth, pam_trace_cname(pamh), function_name, 1226 (void *)pamh, flags, pamh->include_depth ? "included" : "final", 1227 required_error ? "required" : success ? "success" : 1228 optional_error ? "optional" : "default", 1229 pam_strerror(pamh, required_error ? required_error : 1230 success ? PAM_SUCCESS : optional_error ? optional_error : def_err)); 1231 if (pamh->include_depth > 0) { 1232 free_pam_conf_info(pamh); 1233 pamh->include_depth--; 1234 /* continue at next entry */ 1235 modulep = pamh->pam_conf_modulep[pamh->include_depth]; 1236 pam_trace(PAM_DEBUG_MODULE, "looping for include[%d:%p]", 1237 pamh->include_depth, (void *)modulep); 1238 goto include; 1239 } 1240 free_pam_conf_info(pamh); 1241 pamh->pam_inmodule = RW_OK; 1242 if (required_error != 0) 1243 return (required_error); 1244 else if (success != 0) 1245 return (PAM_SUCCESS); 1246 else if (optional_error != 0) 1247 return (optional_error); 1248 else 1249 return (def_err); 1250 1251 exit_return: 1252 /* 1253 * All done at whatever depth we're at. 1254 * Go back to not having read /etc/pam.conf 1255 */ 1256 while (pamh->include_depth > 0) { 1257 free_pam_conf_info(pamh); 1258 pamh->include_depth--; 1259 } 1260 free_pam_conf_info(pamh); 1261 pamh->pam_inmodule = RW_OK; 1262 return (err); 1263 } 1264 1265 /* 1266 * pam_authenticate - authenticate a user 1267 */ 1268 1269 int 1270 pam_authenticate(pam_handle_t *pamh, int flags) 1271 { 1272 int retval; 1273 1274 retval = run_stack(pamh, flags, PAM_AUTH_MODULE, PAM_AUTH_ERR, 1275 PAM_AUTHENTICATE, "pam_authenticate"); 1276 1277 if (retval != PAM_SUCCESS) 1278 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1279 return (retval); 1280 } 1281 1282 /* 1283 * pam_setcred - modify or retrieve user credentials 1284 */ 1285 1286 int 1287 pam_setcred(pam_handle_t *pamh, int flags) 1288 { 1289 int retval; 1290 1291 retval = run_stack(pamh, flags, PAM_AUTH_MODULE, PAM_CRED_ERR, 1292 PAM_SETCRED, "pam_setcred"); 1293 1294 if (retval != PAM_SUCCESS) 1295 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1296 return (retval); 1297 } 1298 1299 /* 1300 * pam_acct_mgmt - check password aging, account expiration 1301 */ 1302 1303 int 1304 pam_acct_mgmt(pam_handle_t *pamh, int flags) 1305 { 1306 int retval; 1307 1308 retval = run_stack(pamh, flags, PAM_ACCOUNT_MODULE, PAM_ACCT_EXPIRED, 1309 PAM_ACCT_MGMT, "pam_acct_mgmt"); 1310 1311 if (retval != PAM_SUCCESS && 1312 retval != PAM_NEW_AUTHTOK_REQD) { 1313 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1314 } 1315 return (retval); 1316 } 1317 1318 /* 1319 * pam_open_session - begin session management 1320 */ 1321 1322 int 1323 pam_open_session(pam_handle_t *pamh, int flags) 1324 { 1325 int retval; 1326 1327 retval = run_stack(pamh, flags, PAM_SESSION_MODULE, PAM_SESSION_ERR, 1328 PAM_OPEN_SESSION, "pam_open_session"); 1329 1330 if (retval != PAM_SUCCESS) 1331 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1332 return (retval); 1333 } 1334 1335 /* 1336 * pam_close_session - terminate session management 1337 */ 1338 1339 int 1340 pam_close_session(pam_handle_t *pamh, int flags) 1341 { 1342 int retval; 1343 1344 retval = run_stack(pamh, flags, PAM_SESSION_MODULE, PAM_SESSION_ERR, 1345 PAM_CLOSE_SESSION, "pam_close_session"); 1346 1347 if (retval != PAM_SUCCESS) 1348 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1349 return (retval); 1350 } 1351 1352 /* 1353 * pam_chauthtok - change user authentication token 1354 */ 1355 1356 int 1357 pam_chauthtok(pam_handle_t *pamh, int flags) 1358 { 1359 int retval; 1360 1361 /* do not let apps use PAM_PRELIM_CHECK or PAM_UPDATE_AUTHTOK */ 1362 if (flags & (PAM_PRELIM_CHECK | PAM_UPDATE_AUTHTOK)) { 1363 pam_trace(PAM_DEBUG_DEFAULT, 1364 "pam_chauthtok(%p, %x): %s", (void *)pamh, flags, 1365 pam_strerror(pamh, PAM_SYMBOL_ERR)); 1366 return (PAM_SYMBOL_ERR); 1367 } 1368 1369 /* 1st pass: PRELIM CHECK */ 1370 retval = run_stack(pamh, flags | PAM_PRELIM_CHECK, PAM_PASSWORD_MODULE, 1371 PAM_AUTHTOK_ERR, PAM_CHAUTHTOK, "pam_chauthtok-prelim"); 1372 1373 if (retval == PAM_TRY_AGAIN) 1374 return (retval); 1375 1376 if (retval != PAM_SUCCESS) { 1377 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1378 return (retval); 1379 } 1380 1381 /* 2nd pass: UPDATE AUTHTOK */ 1382 retval = run_stack(pamh, flags | PAM_UPDATE_AUTHTOK, 1383 PAM_PASSWORD_MODULE, PAM_AUTHTOK_ERR, PAM_CHAUTHTOK, 1384 "pam_chauthtok-update"); 1385 1386 if (retval != PAM_SUCCESS) 1387 (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); 1388 1389 return (retval); 1390 } 1391 1392 /* 1393 * pam_putenv - add an environment variable to the PAM handle 1394 * if name_value == 'NAME=VALUE' then set variable to the value 1395 * if name_value == 'NAME=' then set variable to an empty value 1396 * if name_value == 'NAME' then delete the variable 1397 */ 1398 1399 int 1400 pam_putenv(pam_handle_t *pamh, const char *name_value) 1401 { 1402 int error = PAM_SYSTEM_ERR; 1403 char *equal_sign = 0; 1404 char *name = NULL, *value = NULL, *tmp_value = NULL; 1405 env_list *traverse, *trail; 1406 1407 pam_trace(PAM_DEBUG_DEFAULT, 1408 "pam_putenv(%p, %s)", (void *)pamh, 1409 name_value ? name_value : "NULL"); 1410 1411 if (pamh == NULL || name_value == NULL) 1412 goto out; 1413 1414 /* see if we were passed 'NAME=VALUE', 'NAME=', or 'NAME' */ 1415 if ((equal_sign = strchr(name_value, '=')) != 0) { 1416 if ((name = (char *)calloc(equal_sign - name_value + 1, 1417 sizeof (char))) == 0) { 1418 error = PAM_BUF_ERR; 1419 goto out; 1420 } 1421 (void) strncpy(name, name_value, equal_sign - name_value); 1422 if ((value = strdup(++equal_sign)) == 0) { 1423 error = PAM_BUF_ERR; 1424 goto out; 1425 } 1426 } else { 1427 if ((name = strdup(name_value)) == 0) { 1428 error = PAM_BUF_ERR; 1429 goto out; 1430 } 1431 } 1432 1433 /* check to see if we already have this variable in the PAM handle */ 1434 traverse = pamh->pam_env; 1435 trail = traverse; 1436 while (traverse && strncmp(traverse->name, name, strlen(name))) { 1437 trail = traverse; 1438 traverse = traverse->next; 1439 } 1440 1441 if (traverse) { 1442 /* found a match */ 1443 if (value == 0) { 1444 /* remove the env variable */ 1445 if (pamh->pam_env == traverse) 1446 pamh->pam_env = traverse->next; 1447 else 1448 trail->next = traverse->next; 1449 free_env(traverse); 1450 } else if (strlen(value) == 0) { 1451 /* set env variable to empty value */ 1452 if ((tmp_value = strdup("")) == 0) { 1453 error = PAM_SYSTEM_ERR; 1454 goto out; 1455 } 1456 free(traverse->value); 1457 traverse->value = tmp_value; 1458 } else { 1459 /* set the new value */ 1460 if ((tmp_value = strdup(value)) == 0) { 1461 error = PAM_SYSTEM_ERR; 1462 goto out; 1463 } 1464 free(traverse->value); 1465 traverse->value = tmp_value; 1466 } 1467 1468 } else if (traverse == 0 && value) { 1469 /* 1470 * could not find a match in the PAM handle. 1471 * add the new value if there is one 1472 */ 1473 if ((traverse = (env_list *)calloc 1474 (1, 1475 sizeof (env_list))) == 0) { 1476 error = PAM_BUF_ERR; 1477 goto out; 1478 } 1479 if ((traverse->name = strdup(name)) == 0) { 1480 free_env(traverse); 1481 error = PAM_BUF_ERR; 1482 goto out; 1483 } 1484 if ((traverse->value = strdup(value)) == 0) { 1485 free_env(traverse); 1486 error = PAM_BUF_ERR; 1487 goto out; 1488 } 1489 if (trail == 0) { 1490 /* new head of list */ 1491 pamh->pam_env = traverse; 1492 } else { 1493 /* adding to end of list */ 1494 trail->next = traverse; 1495 } 1496 } 1497 1498 error = PAM_SUCCESS; 1499 out: 1500 if (error != PAM_SUCCESS) { 1501 if (traverse) { 1502 if (traverse->name) 1503 free(traverse->name); 1504 if (traverse->value) 1505 free(traverse->value); 1506 free(traverse); 1507 } 1508 } 1509 if (name) 1510 free(name); 1511 if (value) 1512 free(value); 1513 return (error); 1514 } 1515 1516 /* 1517 * pam_getenv - retrieve an environment variable from the PAM handle 1518 */ 1519 char * 1520 pam_getenv(pam_handle_t *pamh, const char *name) 1521 { 1522 int error = PAM_SYSTEM_ERR; 1523 env_list *traverse; 1524 1525 pam_trace(PAM_DEBUG_DEFAULT, 1526 "pam_getenv(%p, %p)", (void *)pamh, (void *)name); 1527 1528 if (pamh == NULL || name == NULL) 1529 goto out; 1530 1531 /* check to see if we already have this variable in the PAM handle */ 1532 traverse = pamh->pam_env; 1533 while (traverse && strncmp(traverse->name, name, strlen(name))) { 1534 traverse = traverse->next; 1535 } 1536 error = (traverse ? PAM_SUCCESS : PAM_SYSTEM_ERR); 1537 pam_trace(PAM_DEBUG_DEFAULT, 1538 "pam_getenv(%p, %s)=%s", (void *)pamh, name, 1539 traverse ? traverse->value : "NULL"); 1540 out: 1541 return (error ? NULL : strdup(traverse->value)); 1542 } 1543 1544 /* 1545 * pam_getenvlist - retrieve all environment variables from the PAM handle 1546 */ 1547 char ** 1548 pam_getenvlist(pam_handle_t *pamh) 1549 { 1550 int error = PAM_SYSTEM_ERR; 1551 char **list = 0; 1552 int length = 0; 1553 env_list *traverse; 1554 char env_buf[1024]; 1555 1556 pam_trace(PAM_DEBUG_DEFAULT, 1557 "pam_getenvlist(%p)", (void *)pamh); 1558 1559 if (pamh == NULL) 1560 goto out; 1561 1562 /* find out how many environment variables we have */ 1563 traverse = pamh->pam_env; 1564 while (traverse) { 1565 length++; 1566 traverse = traverse->next; 1567 } 1568 1569 /* allocate the array we will return to the caller */ 1570 if ((list = (char **)calloc(length + 1, sizeof (char *))) == 0) { 1571 error = PAM_BUF_ERR; 1572 goto out; 1573 } 1574 1575 /* add the variables one by one */ 1576 length = 0; 1577 traverse = pamh->pam_env; 1578 while (traverse) { 1579 (void) snprintf(env_buf, sizeof (env_buf), "%s=%s", 1580 traverse->name, traverse->value); 1581 if ((list[length] = strdup(env_buf)) == 0) { 1582 error = PAM_BUF_ERR; 1583 goto out; 1584 } 1585 length++; 1586 traverse = traverse->next; 1587 } 1588 1589 /* null terminate the list */ 1590 list[length] = 0; 1591 1592 error = PAM_SUCCESS; 1593 out: 1594 if (error != PAM_SUCCESS) { 1595 /* free the partially constructed list */ 1596 if (list) { 1597 length = 0; 1598 while (list[length] != NULL) { 1599 free(list[length]); 1600 length++; 1601 } 1602 free(list); 1603 } 1604 } 1605 return (error ? NULL : list); 1606 } 1607 1608 /* 1609 * Routines to load a requested module on demand 1610 */ 1611 1612 /* 1613 * load_modules - load the requested module. 1614 * if the dlopen or dlsym fail, then 1615 * the module is ignored. 1616 */ 1617 1618 static int 1619 load_modules(pam_handle_t *pamh, int type, char *function_name, 1620 pamtab_t *pam_entry) 1621 { 1622 void *mh; 1623 struct auth_module *authp; 1624 struct account_module *accountp; 1625 struct session_module *sessionp; 1626 struct password_module *passwdp; 1627 int loading_functions = 0; /* are we currently loading functions? */ 1628 1629 pam_trace(PAM_DEBUG_MODULE, "load_modules[%d:%s](%p, %s)=%s:%s", 1630 pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, 1631 function_name, pam_trace_fname(pam_entry->pam_flag), 1632 pam_entry->module_path); 1633 1634 while (pam_entry != NULL) { 1635 pam_trace(PAM_DEBUG_DEFAULT, 1636 "while load_modules[%d:%s](%p, %s)=%s", 1637 pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, 1638 function_name, pam_entry->module_path); 1639 1640 if (pam_entry->pam_flag & PAM_INCLUDE) { 1641 pam_trace(PAM_DEBUG_DEFAULT, 1642 "done load_modules[%d:%s](%p, %s)=%s", 1643 pamh->include_depth, pam_trace_cname(pamh), 1644 (void *)pamh, function_name, 1645 pam_entry->module_path); 1646 return (PAM_SUCCESS); 1647 } 1648 switch (type) { 1649 case PAM_AUTH_MODULE: 1650 1651 /* if the function has already been loaded, return */ 1652 authp = pam_entry->function_ptr; 1653 if (!loading_functions && 1654 (((strcmp(function_name, PAM_SM_AUTHENTICATE) 1655 == 0) && 1656 authp && authp->pam_sm_authenticate) || 1657 ((strcmp(function_name, PAM_SM_SETCRED) == 0) && 1658 authp && authp->pam_sm_setcred))) { 1659 return (PAM_SUCCESS); 1660 } 1661 1662 /* function has not been loaded yet */ 1663 loading_functions = 1; 1664 if (authp == NULL) { 1665 authp = (struct auth_module *)calloc(1, 1666 sizeof (struct auth_module)); 1667 if (authp == NULL) 1668 return (PAM_BUF_ERR); 1669 } 1670 1671 /* if open_module fails, return error */ 1672 if ((mh = open_module(pamh, 1673 pam_entry->module_path)) == NULL) { 1674 __pam_log(LOG_AUTH | LOG_ERR, 1675 "load_modules[%d:%s]: can not open module " 1676 "%s", pamh->include_depth, 1677 pam_trace_cname(pamh), 1678 pam_entry->module_path); 1679 free(authp); 1680 return (PAM_OPEN_ERR); 1681 } 1682 1683 /* load the authentication function */ 1684 if (strcmp(function_name, PAM_SM_AUTHENTICATE) == 0) { 1685 if (load_function(mh, PAM_SM_AUTHENTICATE, 1686 &authp->pam_sm_authenticate) 1687 != PAM_SUCCESS) { 1688 /* return error if dlsym fails */ 1689 free(authp); 1690 return (PAM_SYMBOL_ERR); 1691 } 1692 1693 /* load the setcred function */ 1694 } else if (strcmp(function_name, PAM_SM_SETCRED) == 0) { 1695 if (load_function(mh, PAM_SM_SETCRED, 1696 &authp->pam_sm_setcred) != PAM_SUCCESS) { 1697 /* return error if dlsym fails */ 1698 free(authp); 1699 return (PAM_SYMBOL_ERR); 1700 } 1701 } 1702 pam_entry->function_ptr = authp; 1703 break; 1704 case PAM_ACCOUNT_MODULE: 1705 accountp = pam_entry->function_ptr; 1706 if (!loading_functions && 1707 (strcmp(function_name, PAM_SM_ACCT_MGMT) == 0) && 1708 accountp && accountp->pam_sm_acct_mgmt) { 1709 return (PAM_SUCCESS); 1710 } 1711 1712 /* 1713 * If functions are added to the account module, 1714 * verify that one of the other functions hasn't 1715 * already loaded it. See PAM_AUTH_MODULE code. 1716 */ 1717 loading_functions = 1; 1718 accountp = (struct account_module *)calloc(1, 1719 sizeof (struct account_module)); 1720 if (accountp == NULL) 1721 return (PAM_BUF_ERR); 1722 1723 /* if open_module fails, return error */ 1724 if ((mh = open_module(pamh, 1725 pam_entry->module_path)) == NULL) { 1726 __pam_log(LOG_AUTH | LOG_ERR, 1727 "load_modules[%d:%s]: can not open module " 1728 "%s", pamh->include_depth, 1729 pam_trace_cname(pamh), 1730 pam_entry->module_path); 1731 free(accountp); 1732 return (PAM_OPEN_ERR); 1733 } 1734 1735 if (load_function(mh, PAM_SM_ACCT_MGMT, 1736 &accountp->pam_sm_acct_mgmt) != PAM_SUCCESS) { 1737 __pam_log(LOG_AUTH | LOG_ERR, 1738 "load_modules[%d:%s]: pam_sm_acct_mgmt() " 1739 "missing", pamh->include_depth, 1740 pam_trace_cname(pamh)); 1741 free(accountp); 1742 return (PAM_SYMBOL_ERR); 1743 } 1744 pam_entry->function_ptr = accountp; 1745 break; 1746 case PAM_SESSION_MODULE: 1747 sessionp = pam_entry->function_ptr; 1748 if (!loading_functions && 1749 (((strcmp(function_name, 1750 PAM_SM_OPEN_SESSION) == 0) && 1751 sessionp && sessionp->pam_sm_open_session) || 1752 ((strcmp(function_name, 1753 PAM_SM_CLOSE_SESSION) == 0) && 1754 sessionp && sessionp->pam_sm_close_session))) { 1755 return (PAM_SUCCESS); 1756 } 1757 1758 loading_functions = 1; 1759 if (sessionp == NULL) { 1760 sessionp = (struct session_module *) 1761 calloc(1, sizeof (struct session_module)); 1762 if (sessionp == NULL) 1763 return (PAM_BUF_ERR); 1764 } 1765 1766 /* if open_module fails, return error */ 1767 if ((mh = open_module(pamh, 1768 pam_entry->module_path)) == NULL) { 1769 __pam_log(LOG_AUTH | LOG_ERR, 1770 "load_modules[%d:%s]: can not open module " 1771 "%s", pamh->include_depth, 1772 pam_trace_cname(pamh), 1773 pam_entry->module_path); 1774 free(sessionp); 1775 return (PAM_OPEN_ERR); 1776 } 1777 1778 if ((strcmp(function_name, PAM_SM_OPEN_SESSION) == 0) && 1779 load_function(mh, PAM_SM_OPEN_SESSION, 1780 &sessionp->pam_sm_open_session) 1781 != PAM_SUCCESS) { 1782 free(sessionp); 1783 return (PAM_SYMBOL_ERR); 1784 } else if ((strcmp(function_name, 1785 PAM_SM_CLOSE_SESSION) == 0) && 1786 load_function(mh, PAM_SM_CLOSE_SESSION, 1787 &sessionp->pam_sm_close_session) 1788 != PAM_SUCCESS) { 1789 free(sessionp); 1790 return (PAM_SYMBOL_ERR); 1791 } 1792 pam_entry->function_ptr = sessionp; 1793 break; 1794 case PAM_PASSWORD_MODULE: 1795 passwdp = pam_entry->function_ptr; 1796 if (!loading_functions && 1797 (strcmp(function_name, PAM_SM_CHAUTHTOK) == 0) && 1798 passwdp && passwdp->pam_sm_chauthtok) { 1799 return (PAM_SUCCESS); 1800 } 1801 1802 /* 1803 * If functions are added to the password module, 1804 * verify that one of the other functions hasn't 1805 * already loaded it. See PAM_AUTH_MODULE code. 1806 */ 1807 loading_functions = 1; 1808 passwdp = (struct password_module *) 1809 calloc(1, sizeof (struct password_module)); 1810 if (passwdp == NULL) 1811 return (PAM_BUF_ERR); 1812 1813 /* if open_module fails, continue */ 1814 if ((mh = open_module(pamh, 1815 pam_entry->module_path)) == NULL) { 1816 __pam_log(LOG_AUTH | LOG_ERR, 1817 "load_modules[%d:%s]: can not open module " 1818 "%s", pamh->include_depth, 1819 pam_trace_cname(pamh), 1820 pam_entry->module_path); 1821 free(passwdp); 1822 return (PAM_OPEN_ERR); 1823 } 1824 1825 if (load_function(mh, PAM_SM_CHAUTHTOK, 1826 &passwdp->pam_sm_chauthtok) != PAM_SUCCESS) { 1827 free(passwdp); 1828 return (PAM_SYMBOL_ERR); 1829 } 1830 pam_entry->function_ptr = passwdp; 1831 break; 1832 default: 1833 pam_trace(PAM_DEBUG_DEFAULT, 1834 "load_modules[%d:%s](%p, %s): unsupported type %d", 1835 pamh->include_depth, pam_trace_cname(pamh), 1836 (void *)pamh, function_name, type); 1837 break; 1838 } 1839 1840 pam_entry = pam_entry->next; 1841 } /* while */ 1842 1843 pam_trace(PAM_DEBUG_MODULE, "load_modules[%d:%s](%p, %s)=done", 1844 pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, 1845 function_name); 1846 1847 return (PAM_SUCCESS); 1848 } 1849 1850 /* 1851 * open_module - Open the module first checking for 1852 * propers modes and ownerships on the file. 1853 */ 1854 1855 static void * 1856 open_module(pam_handle_t *pamh, char *module_so) 1857 { 1858 struct stat64 stb; 1859 char *errmsg; 1860 void *lfd; 1861 fd_list *module_fds = 0; 1862 fd_list *trail = 0; 1863 fd_list *traverse = 0; 1864 1865 /* Check the ownership and file modes */ 1866 if (stat64(module_so, &stb) < 0) { 1867 __pam_log(LOG_AUTH | LOG_ERR, 1868 "open_module[%d:%s]: stat(%s) failed: %s", 1869 pamh->include_depth, pam_trace_cname(pamh), module_so, 1870 strerror(errno)); 1871 return (NULL); 1872 } 1873 if (stb.st_uid != (uid_t)0) { 1874 __pam_log(LOG_AUTH | LOG_ALERT, 1875 "open_module[%d:%s]: Owner of the module %s is not root", 1876 pamh->include_depth, pam_trace_cname(pamh), module_so); 1877 return (NULL); 1878 } 1879 if (stb.st_mode & S_IWGRP) { 1880 __pam_log(LOG_AUTH | LOG_ALERT, 1881 "open_module[%d:%s]: module %s writable by group", 1882 pamh->include_depth, pam_trace_cname(pamh), module_so); 1883 return (NULL); 1884 } 1885 if (stb.st_mode & S_IWOTH) { 1886 __pam_log(LOG_AUTH | LOG_ALERT, 1887 "open_module[%d:%s]: module %s writable by world", 1888 pamh->include_depth, pam_trace_cname(pamh), module_so); 1889 return (NULL); 1890 } 1891 1892 /* 1893 * Perform the dlopen() 1894 */ 1895 lfd = (void *)dlopen(module_so, RTLD_LAZY); 1896 1897 if (lfd == NULL) { 1898 errmsg = dlerror(); 1899 __pam_log(LOG_AUTH | LOG_ERR, "open_module[%d:%s]: %s " 1900 "failed: %s", pamh->include_depth, pam_trace_cname(pamh), 1901 module_so, errmsg != NULL ? errmsg : "Unknown error"); 1902 return (NULL); 1903 } else { 1904 /* add this fd to the pam handle */ 1905 if ((module_fds = (fd_list *)calloc(1, sizeof (fd_list))) 1906 == 0) { 1907 (void) dlclose(lfd); 1908 lfd = 0; 1909 return (NULL); 1910 } 1911 module_fds->mh = lfd; 1912 1913 if (pamh->fd == 0) { 1914 /* adding new head of list */ 1915 pamh->fd = module_fds; 1916 } else { 1917 /* appending to end of list */ 1918 traverse = pamh->fd; 1919 while (traverse) { 1920 trail = traverse; 1921 traverse = traverse->next; 1922 } 1923 trail->next = module_fds; 1924 } 1925 } 1926 1927 return (lfd); 1928 } 1929 1930 /* 1931 * load_function - call dlsym() to resolve the function address 1932 */ 1933 static int 1934 load_function(void *lfd, char *name, int (**func)()) 1935 { 1936 char *errmsg = NULL; 1937 1938 if (lfd == NULL) 1939 return (PAM_SYMBOL_ERR); 1940 1941 *func = (int (*)())dlsym(lfd, name); 1942 if (*func == NULL) { 1943 errmsg = dlerror(); 1944 __pam_log(LOG_AUTH | LOG_ERR, "dlsym failed %s: error %s", 1945 name, errmsg != NULL ? errmsg : "Unknown error"); 1946 return (PAM_SYMBOL_ERR); 1947 } 1948 1949 pam_trace(PAM_DEBUG_DEFAULT, 1950 "load_function: successful load of %s", name); 1951 return (PAM_SUCCESS); 1952 } 1953 1954 /* 1955 * Routines to read the pam.conf configuration file 1956 */ 1957 1958 /* 1959 * open_pam_conf - open the pam.conf config file 1960 */ 1961 1962 static int 1963 open_pam_conf(struct pam_fh **pam_fh, pam_handle_t *pamh, char *config) 1964 { 1965 struct stat64 stb; 1966 int fd; 1967 1968 if ((fd = open(config, O_RDONLY)) == -1) { 1969 __pam_log(LOG_AUTH | LOG_ALERT, 1970 "open_pam_conf[%d:%s]: open(%s) failed: %s", 1971 pamh->include_depth, pam_trace_cname(pamh), config, 1972 strerror(errno)); 1973 return (0); 1974 } 1975 /* Check the ownership and file modes */ 1976 if (fstat64(fd, &stb) < 0) { 1977 __pam_log(LOG_AUTH | LOG_ALERT, 1978 "open_pam_conf[%d:%s]: stat(%s) failed: %s", 1979 pamh->include_depth, pam_trace_cname(pamh), config, 1980 strerror(errno)); 1981 (void) close(fd); 1982 return (0); 1983 } 1984 if (stb.st_uid != (uid_t)0) { 1985 __pam_log(LOG_AUTH | LOG_ALERT, 1986 "open_pam_conf[%d:%s]: Owner of %s is not root", 1987 pamh->include_depth, pam_trace_cname(pamh), config); 1988 (void) close(fd); 1989 return (0); 1990 } 1991 if (stb.st_mode & S_IWGRP) { 1992 __pam_log(LOG_AUTH | LOG_ALERT, 1993 "open_pam_conf[%d:%s]: %s writable by group", 1994 pamh->include_depth, pam_trace_cname(pamh), config); 1995 (void) close(fd); 1996 return (0); 1997 } 1998 if (stb.st_mode & S_IWOTH) { 1999 __pam_log(LOG_AUTH | LOG_ALERT, 2000 "open_pam_conf[%d:%s]: %s writable by world", 2001 pamh->include_depth, pam_trace_cname(pamh), config); 2002 (void) close(fd); 2003 return (0); 2004 } 2005 if ((*pam_fh = calloc(1, sizeof (struct pam_fh))) == NULL) { 2006 (void) close(fd); 2007 return (0); 2008 } 2009 (*pam_fh)->fconfig = fd; 2010 (*pam_fh)->bufsize = (size_t)stb.st_size; 2011 if (((*pam_fh)->data = mmap(0, (*pam_fh)->bufsize, PROT_READ, 2012 MAP_PRIVATE, (*pam_fh)->fconfig, 0)) == MAP_FAILED) { 2013 (void) close(fd); 2014 free (*pam_fh); 2015 return (0); 2016 } 2017 (*pam_fh)->bufferp = (*pam_fh)->data; 2018 2019 return (1); 2020 } 2021 2022 /* 2023 * close_pam_conf - close pam.conf 2024 */ 2025 2026 static void 2027 close_pam_conf(struct pam_fh *pam_fh) 2028 { 2029 (void) munmap(pam_fh->data, pam_fh->bufsize); 2030 (void) close(pam_fh->fconfig); 2031 free(pam_fh); 2032 } 2033 2034 /* 2035 * read_pam_conf - read in each entry in pam.conf and store info 2036 * under the pam handle. 2037 */ 2038 2039 static int 2040 read_pam_conf(pam_handle_t *pamh, char *config) 2041 { 2042 struct pam_fh *pam_fh; 2043 pamtab_t *pamentp; 2044 pamtab_t *tpament; 2045 char *service; 2046 int error; 2047 int i = pamh->include_depth; /* include depth */ 2048 /* 2049 * service types: 2050 * error (-1), "auth" (0), "account" (1), "session" (2), "password" (3) 2051 */ 2052 int service_found[PAM_NUM_MODULE_TYPES+1] = {0, 0, 0, 0, 0}; 2053 2054 (void) pam_get_item(pamh, PAM_SERVICE, (void **)&service); 2055 if (service == NULL || *service == '\0') { 2056 __pam_log(LOG_AUTH | LOG_ERR, "No service name"); 2057 return (PAM_SYSTEM_ERR); 2058 } 2059 2060 pamh->pam_conf_name[i] = strdup(config); 2061 pam_trace(PAM_DEBUG_CONF, "read_pam_conf[%d:%s](%p) open(%s)", 2062 i, pam_trace_cname(pamh), (void *)pamh, config); 2063 if (open_pam_conf(&pam_fh, pamh, config) == 0) 2064 return (PAM_SYSTEM_ERR); 2065 2066 while ((error = 2067 get_pam_conf_entry(pam_fh, pamh, &pamentp)) == PAM_SUCCESS && 2068 pamentp) { 2069 2070 /* See if entry is this service and valid */ 2071 if (verify_pam_conf(pamentp, service)) { 2072 pam_trace(PAM_DEBUG_CONF, 2073 "read_pam_conf[%d:%s](%p): bad entry error %s", 2074 i, pam_trace_cname(pamh), (void *)pamh, service); 2075 2076 error = PAM_SYSTEM_ERR; 2077 free_pamconf(pamentp); 2078 goto out; 2079 } 2080 if (strcasecmp(pamentp->pam_service, service) == 0) { 2081 pam_trace(PAM_DEBUG_CONF, 2082 "read_pam_conf[%d:%s](%p): processing %s", 2083 i, pam_trace_cname(pamh), (void *)pamh, service); 2084 /* process first service entry */ 2085 if (service_found[pamentp->pam_type + 1] == 0) { 2086 /* purge "other" entries */ 2087 while ((tpament = pamh->pam_conf_info[i] 2088 [pamentp->pam_type]) != NULL) { 2089 pam_trace(PAM_DEBUG_CONF, 2090 "read_pam_conf(%p): purging " 2091 "\"other\"[%d:%s][%s]", 2092 (void *)pamh, i, 2093 pam_trace_cname(pamh), 2094 pam_snames[pamentp->pam_type]); 2095 pamh->pam_conf_info[i] 2096 [pamentp->pam_type] = tpament->next; 2097 free_pamconf(tpament); 2098 } 2099 /* add first service entry */ 2100 pam_trace(PAM_DEBUG_CONF, 2101 "read_pam_conf(%p): adding 1st " 2102 "%s[%d:%s][%s]", 2103 (void *)pamh, service, i, 2104 pam_trace_cname(pamh), 2105 pam_snames[pamentp->pam_type]); 2106 pamh->pam_conf_info[i][pamentp->pam_type] = 2107 pamentp; 2108 service_found[pamentp->pam_type + 1] = 1; 2109 } else { 2110 /* append more service entries */ 2111 pam_trace(PAM_DEBUG_CONF, 2112 "read_pam_conf(%p): adding more " 2113 "%s[%d:%s][%s]", 2114 (void *)pamh, service, i, 2115 pam_trace_cname(pamh), 2116 pam_snames[pamentp->pam_type]); 2117 tpament = 2118 pamh->pam_conf_info[i][pamentp->pam_type]; 2119 while (tpament->next != NULL) { 2120 tpament = tpament->next; 2121 } 2122 tpament->next = pamentp; 2123 } 2124 } else if (service_found[pamentp->pam_type + 1] == 0) { 2125 /* See if "other" entry available and valid */ 2126 if (verify_pam_conf(pamentp, "other")) { 2127 pam_trace(PAM_DEBUG_CONF, 2128 "read_pam_conf(%p): bad entry error %s " 2129 "\"other\"[%d:%s]", 2130 (void *)pamh, service, i, 2131 pam_trace_cname(pamh)); 2132 error = PAM_SYSTEM_ERR; 2133 free_pamconf(pamentp); 2134 goto out; 2135 } 2136 if (strcasecmp(pamentp->pam_service, "other") == 0) { 2137 pam_trace(PAM_DEBUG_CONF, 2138 "read_pam_conf(%p): processing " 2139 "\"other\"[%d:%s]", (void *)pamh, i, 2140 pam_trace_cname(pamh)); 2141 if ((tpament = pamh->pam_conf_info[i] 2142 [pamentp->pam_type]) == NULL) { 2143 /* add first "other" entry */ 2144 pam_trace(PAM_DEBUG_CONF, 2145 "read_pam_conf(%p): adding 1st " 2146 "other[%d:%s][%s]", (void *)pamh, i, 2147 pam_trace_cname(pamh), 2148 pam_snames[pamentp->pam_type]); 2149 pamh->pam_conf_info[i] 2150 [pamentp->pam_type] = pamentp; 2151 } else { 2152 /* append more "other" entries */ 2153 pam_trace(PAM_DEBUG_CONF, 2154 "read_pam_conf(%p): adding more " 2155 "other[%d:%s][%s]", (void *)pamh, i, 2156 pam_trace_cname(pamh), 2157 pam_snames[pamentp->pam_type]); 2158 while (tpament->next != NULL) { 2159 tpament = tpament->next; 2160 } 2161 tpament->next = pamentp; 2162 } 2163 } else { 2164 /* irrelevent entry */ 2165 free_pamconf(pamentp); 2166 } 2167 } else { 2168 /* irrelevent entry */ 2169 free_pamconf(pamentp); 2170 } 2171 } 2172 out: 2173 (void) close_pam_conf(pam_fh); 2174 if (error != PAM_SUCCESS) 2175 free_pam_conf_info(pamh); 2176 return (error); 2177 } 2178 2179 /* 2180 * get_pam_conf_entry - get a pam.conf entry 2181 */ 2182 2183 static int 2184 get_pam_conf_entry(struct pam_fh *pam_fh, pam_handle_t *pamh, pamtab_t **pam) 2185 { 2186 char *cp, *arg; 2187 int argc; 2188 char *tmp, *tmp_free; 2189 int i; 2190 char *current_line = NULL; 2191 int error = PAM_SYSTEM_ERR; /* preset to error */ 2192 2193 /* get the next line from pam.conf */ 2194 if ((cp = nextline(pam_fh)) == NULL) { 2195 /* no more lines in pam.conf ==> return */ 2196 error = PAM_SUCCESS; 2197 *pam = NULL; 2198 goto out; 2199 } 2200 2201 if ((*pam = (pamtab_t *)calloc(1, sizeof (pamtab_t))) == NULL) { 2202 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2203 goto out; 2204 } 2205 2206 /* copy full line for error reporting */ 2207 if ((current_line = strdup(cp)) == NULL) { 2208 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2209 goto out; 2210 } 2211 2212 pam_trace(PAM_DEBUG_CONF, 2213 "pam.conf[%s] entry:\t%s", pam_trace_cname(pamh), current_line); 2214 2215 /* get service name (e.g. login, su, passwd) */ 2216 if ((arg = read_next_token(&cp)) == 0) { 2217 __pam_log(LOG_AUTH | LOG_CRIT, 2218 "illegal pam.conf[%s] entry: %s: missing SERVICE NAME", 2219 pam_trace_cname(pamh), current_line); 2220 goto out; 2221 } 2222 if (((*pam)->pam_service = strdup(arg)) == 0) { 2223 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2224 goto out; 2225 } 2226 2227 /* get module type (e.g. authentication, acct mgmt) */ 2228 if ((arg = read_next_token(&cp)) == 0) { 2229 __pam_log(LOG_AUTH | LOG_CRIT, 2230 "illegal pam.conf[%s] entry: %s: missing MODULE TYPE", 2231 pam_trace_cname(pamh), current_line); 2232 (*pam)->pam_type = -1; /* 0 is a valid value */ 2233 goto getflag; 2234 } 2235 if (strcasecmp(arg, PAM_AUTH_NAME) == 0) { 2236 (*pam)->pam_type = PAM_AUTH_MODULE; 2237 } else if (strcasecmp(arg, PAM_ACCOUNT_NAME) == 0) { 2238 (*pam)->pam_type = PAM_ACCOUNT_MODULE; 2239 } else if (strcasecmp(arg, PAM_SESSION_NAME) == 0) { 2240 (*pam)->pam_type = PAM_SESSION_MODULE; 2241 } else if (strcasecmp(arg, PAM_PASSWORD_NAME) == 0) { 2242 (*pam)->pam_type = PAM_PASSWORD_MODULE; 2243 } else { 2244 /* error */ 2245 __pam_log(LOG_AUTH | LOG_CRIT, 2246 "illegal pam.conf[%s] entry: %s: invalid module " 2247 "type: %s", pam_trace_cname(pamh), current_line, arg); 2248 (*pam)->pam_type = -1; /* 0 is a valid value */ 2249 } 2250 2251 getflag: 2252 /* get pam flag (e.g., requisite, required, sufficient, optional) */ 2253 if ((arg = read_next_token(&cp)) == 0) { 2254 __pam_log(LOG_AUTH | LOG_CRIT, 2255 "illegal pam.conf[%s] entry: %s: missing CONTROL FLAG", 2256 pam_trace_cname(pamh), current_line); 2257 goto getpath; 2258 } 2259 if (strcasecmp(arg, PAM_BINDING_NAME) == 0) { 2260 (*pam)->pam_flag = PAM_BINDING; 2261 } else if (strcasecmp(arg, PAM_INCLUDE_NAME) == 0) { 2262 (*pam)->pam_flag = PAM_INCLUDE; 2263 } else if (strcasecmp(arg, PAM_OPTIONAL_NAME) == 0) { 2264 (*pam)->pam_flag = PAM_OPTIONAL; 2265 } else if (strcasecmp(arg, PAM_REQUIRED_NAME) == 0) { 2266 (*pam)->pam_flag = PAM_REQUIRED; 2267 } else if (strcasecmp(arg, PAM_REQUISITE_NAME) == 0) { 2268 (*pam)->pam_flag = PAM_REQUISITE; 2269 } else if (strcasecmp(arg, PAM_SUFFICIENT_NAME) == 0) { 2270 (*pam)->pam_flag = PAM_SUFFICIENT; 2271 } else { 2272 /* error */ 2273 __pam_log(LOG_AUTH | LOG_CRIT, 2274 "illegal pam.conf[%s] entry: %s", 2275 pam_trace_cname(pamh), current_line); 2276 __pam_log(LOG_AUTH | LOG_CRIT, 2277 "\tinvalid control flag: %s", arg); 2278 } 2279 2280 getpath: 2281 /* get module path (e.g. /usr/lib/security/pam_unix_auth.so.1) */ 2282 if ((arg = read_next_token(&cp)) == 0) { 2283 __pam_log(LOG_AUTH | LOG_CRIT, 2284 "illegal pam.conf[%s] entry: %s: missing MODULE PATH", 2285 pam_trace_cname(pamh), current_line); 2286 error = PAM_SUCCESS; /* success */ 2287 goto out; 2288 } 2289 if (arg[0] != '/') { 2290 size_t len; 2291 /* 2292 * If module path does not start with "/", then 2293 * prepend PAM_LIB_DIR (/usr/lib/security/). 2294 */ 2295 /* sizeof (PAM_LIB_DIR) has room for '\0' */ 2296 len = sizeof (PAM_LIB_DIR) + sizeof (PAM_ISA_DIR) + strlen(arg); 2297 if (((*pam)->module_path = malloc(len)) == NULL) { 2298 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2299 goto out; 2300 } 2301 if ((*pam)->pam_flag & PAM_INCLUDE) { 2302 (void) snprintf((*pam)->module_path, len, "%s%s", 2303 PAM_LIB_DIR, arg); 2304 } else { 2305 (void) snprintf((*pam)->module_path, len, "%s%s%s", 2306 PAM_LIB_DIR, PAM_ISA_DIR, arg); 2307 } 2308 } else { 2309 /* Full path provided for module */ 2310 char *isa; 2311 2312 /* Check for Instruction Set Architecture indicator */ 2313 if ((isa = strstr(arg, PAM_ISA)) != NULL) { 2314 size_t len; 2315 len = strlen(arg) - (sizeof (PAM_ISA)-1) + 2316 sizeof (PAM_ISA_DIR); 2317 2318 /* substitute the architecture dependent path */ 2319 if (((*pam)->module_path = malloc(len)) == NULL) { 2320 __pam_log(LOG_AUTH | LOG_ERR, 2321 "strdup: out of memory"); 2322 goto out; 2323 } 2324 *isa = '\000'; 2325 isa += strlen(PAM_ISA); 2326 (void) snprintf((*pam)->module_path, len, "%s%s%s", 2327 arg, PAM_ISA_DIR, isa); 2328 } else if (((*pam)->module_path = strdup(arg)) == 0) { 2329 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2330 goto out; 2331 } 2332 } 2333 2334 /* count the number of module-specific options first */ 2335 argc = 0; 2336 if ((tmp = strdup(cp)) == NULL) { 2337 __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); 2338 goto out; 2339 } 2340 tmp_free = tmp; 2341 for (arg = read_next_token(&tmp); arg; arg = read_next_token(&tmp)) 2342 argc++; 2343 free(tmp_free); 2344 2345 /* allocate array for the module-specific options */ 2346 if (argc > 0) { 2347 if (((*pam)->module_argv = (char **) 2348 calloc(argc+1, sizeof (char *))) == 0) { 2349 __pam_log(LOG_AUTH | LOG_ERR, "calloc: out of memory"); 2350 goto out; 2351 } 2352 i = 0; 2353 for (arg = read_next_token(&cp); arg; 2354 arg = read_next_token(&cp)) { 2355 (*pam)->module_argv[i] = strdup(arg); 2356 if ((*pam)->module_argv[i] == NULL) { 2357 __pam_log(LOG_AUTH | LOG_ERR, "strdup failed"); 2358 goto out; 2359 } 2360 i++; 2361 } 2362 (*pam)->module_argv[argc] = NULL; 2363 } 2364 (*pam)->module_argc = argc; 2365 2366 error = PAM_SUCCESS; /* success */ 2367 2368 out: 2369 if (current_line) 2370 free(current_line); 2371 if (error != PAM_SUCCESS) { 2372 /* on error free this */ 2373 if (*pam) 2374 free_pamconf(*pam); 2375 } 2376 return (error); 2377 } 2378 2379 2380 /* 2381 * read_next_token - skip tab and space characters and return the next token 2382 */ 2383 2384 static char * 2385 read_next_token(char **cpp) 2386 { 2387 register char *cp = *cpp; 2388 char *start; 2389 2390 if (cp == (char *)0) { 2391 *cpp = (char *)0; 2392 return ((char *)0); 2393 } 2394 while (*cp == ' ' || *cp == '\t') 2395 cp++; 2396 if (*cp == '\0') { 2397 *cpp = (char *)0; 2398 return ((char *)0); 2399 } 2400 start = cp; 2401 while (*cp && *cp != ' ' && *cp != '\t') 2402 cp++; 2403 if (*cp != '\0') 2404 *cp++ = '\0'; 2405 *cpp = cp; 2406 return (start); 2407 } 2408 2409 static char * 2410 pam_conf_strnchr(char *sp, int c, intptr_t count) 2411 { 2412 while (count) { 2413 if (*sp == (char)c) 2414 return ((char *)sp); 2415 else { 2416 sp++; 2417 count--; 2418 } 2419 }; 2420 return (NULL); 2421 } 2422 2423 /* 2424 * nextline - skip all blank lines and comments 2425 */ 2426 2427 static char * 2428 nextline(struct pam_fh *pam_fh) 2429 { 2430 char *ll; 2431 int find_a_line = 0; 2432 char *data = pam_fh->data; 2433 char *bufferp = pam_fh->bufferp; 2434 char *bufferendp = &data[pam_fh->bufsize]; 2435 2436 /* 2437 * Skip the blank line, comment line 2438 */ 2439 while (!find_a_line) { 2440 /* if we are at the end of the buffer, there is no next line */ 2441 if (bufferp == bufferendp) 2442 return (NULL); 2443 2444 /* skip blank line */ 2445 while (*bufferp == '\n') { 2446 /* 2447 * If we are at the end of the buffer, there is 2448 * no next line. 2449 */ 2450 if (++bufferp == bufferendp) 2451 return (NULL); 2452 /* else we check *bufferp again */ 2453 } 2454 2455 /* skip comment line */ 2456 while (*bufferp == '#') { 2457 if ((ll = pam_conf_strnchr(bufferp, '\n', 2458 bufferendp - bufferp)) != NULL) { 2459 bufferp = ll; 2460 } 2461 else 2462 /* this comment line the last line. no next line */ 2463 return (NULL); 2464 2465 /* 2466 * If we are at the end of the buffer, there is 2467 * no next line. 2468 */ 2469 if (bufferp == bufferendp) 2470 return (NULL); 2471 } 2472 2473 if ((*bufferp != '\n') && (*bufferp != '#')) 2474 find_a_line = 1; 2475 } 2476 2477 /* now we find one line */ 2478 if ((ll = pam_conf_strnchr(bufferp, '\n', bufferendp - bufferp)) 2479 != NULL) { 2480 (void) strncpy(pam_fh->line, bufferp, ll - bufferp); 2481 pam_fh->line[ll - bufferp] = '\0'; 2482 pam_fh->bufferp = ll++; 2483 } else { 2484 ll = bufferendp; 2485 (void) strncpy(pam_fh->line, bufferp, ll - bufferp); 2486 pam_fh->line[ll - bufferp] = '\0'; 2487 pam_fh->bufferp = ll; 2488 } 2489 2490 return (pam_fh->line); 2491 } 2492 2493 /* 2494 * verify_pam_conf - verify that the pam_conf entry is filled in. 2495 * 2496 * Error if there is no service. 2497 * Error if there is a service and it matches the requested service 2498 * but, the type, flag, or path is in error. 2499 */ 2500 2501 static int 2502 verify_pam_conf(pamtab_t *pam, char *service) 2503 { 2504 return ((pam->pam_service == (char *)NULL) || 2505 ((strcasecmp(pam->pam_service, service) == 0) && 2506 ((pam->pam_type == -1) || 2507 (pam->pam_flag == 0) || 2508 (pam->module_path == (char *)NULL)))); 2509 } 2510 2511 /* 2512 * Routines to free allocated storage 2513 */ 2514 2515 /* 2516 * clean_up - free allocated storage in the pam handle 2517 */ 2518 2519 static void 2520 clean_up(pam_handle_t *pamh) 2521 { 2522 int i; 2523 pam_repository_t *auth_rep; 2524 2525 if (pamh) { 2526 /* Cleanup Sun proprietary tag information */ 2527 if (pamh->pam_client_message_version_number) 2528 free(pamh->pam_client_message_version_number); 2529 2530 while (pamh->include_depth >= 0) { 2531 free_pam_conf_info(pamh); 2532 pamh->include_depth--; 2533 } 2534 2535 /* Cleanup PAM_REPOSITORY structure */ 2536 auth_rep = pamh->ps_item[PAM_REPOSITORY].pi_addr; 2537 if (auth_rep != NULL) { 2538 if (auth_rep->type != NULL) 2539 free(auth_rep->type); 2540 if (auth_rep->scope != NULL) 2541 free(auth_rep->scope); 2542 } 2543 2544 for (i = 0; i < PAM_MAX_ITEMS; i++) { 2545 if (pamh->ps_item[i].pi_addr != NULL) { 2546 if (i == PAM_AUTHTOK || i == PAM_OLDAUTHTOK) { 2547 (void) memset(pamh->ps_item[i].pi_addr, 2548 0, pamh->ps_item[i].pi_size); 2549 } 2550 free(pamh->ps_item[i].pi_addr); 2551 } 2552 } 2553 free(pamh); 2554 } 2555 } 2556 2557 /* 2558 * free_pamconf - free memory used to store pam.conf entry 2559 */ 2560 2561 static void 2562 free_pamconf(pamtab_t *cp) 2563 { 2564 int i; 2565 2566 if (cp) { 2567 if (cp->pam_service) 2568 free(cp->pam_service); 2569 if (cp->module_path) 2570 free(cp->module_path); 2571 for (i = 0; i < cp->module_argc; i++) { 2572 if (cp->module_argv[i]) 2573 free(cp->module_argv[i]); 2574 } 2575 if (cp->module_argc > 0) 2576 free(cp->module_argv); 2577 if (cp->function_ptr) 2578 free(cp->function_ptr); 2579 2580 free(cp); 2581 } 2582 } 2583 2584 /* 2585 * free_pam_conf_info - free memory used to store all pam.conf info 2586 * under the pam handle 2587 */ 2588 2589 static void 2590 free_pam_conf_info(pam_handle_t *pamh) 2591 { 2592 pamtab_t *pamentp; 2593 pamtab_t *pament_trail; 2594 int i = pamh->include_depth; 2595 int j; 2596 2597 for (j = 0; j < PAM_NUM_MODULE_TYPES; j++) { 2598 pamentp = pamh->pam_conf_info[i][j]; 2599 pamh->pam_conf_info[i][j] = NULL; 2600 pament_trail = pamentp; 2601 while (pamentp) { 2602 pamentp = pamentp->next; 2603 free_pamconf(pament_trail); 2604 pament_trail = pamentp; 2605 } 2606 } 2607 if (pamh->pam_conf_name[i] != NULL) { 2608 free(pamh->pam_conf_name[i]); 2609 pamh->pam_conf_name[i] = NULL; 2610 } 2611 } 2612 2613 static void 2614 free_env(env_list *pam_env) 2615 { 2616 if (pam_env) { 2617 if (pam_env->name) 2618 free(pam_env->name); 2619 if (pam_env->value) 2620 free(pam_env->value); 2621 free(pam_env); 2622 } 2623 } 2624 2625 /* 2626 * Internal convenience functions for Solaris PAM service modules. 2627 */ 2628 2629 #include <libintl.h> 2630 #include <nl_types.h> 2631 #include <synch.h> 2632 #include <locale.h> 2633 #include <thread.h> 2634 2635 typedef struct pam_msg_data { 2636 nl_catd fd; 2637 } pam_msg_data_t; 2638 2639 /* 2640 * free_resp(): 2641 * free storage for responses used in the call back "pam_conv" functions 2642 */ 2643 2644 void 2645 free_resp(int num_msg, struct pam_response *resp) 2646 { 2647 int i; 2648 struct pam_response *r; 2649 2650 if (resp) { 2651 r = resp; 2652 for (i = 0; i < num_msg; i++, r++) { 2653 if (r->resp) { 2654 /* clear before freeing -- may be a password */ 2655 bzero(r->resp, strlen(r->resp)); 2656 free(r->resp); 2657 r->resp = NULL; 2658 } 2659 } 2660 free(resp); 2661 } 2662 } 2663 2664 static int 2665 do_conv(pam_handle_t *pamh, int msg_style, int num_msg, 2666 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE], void *conv_apdp, 2667 struct pam_response *ret_respp[]) 2668 { 2669 struct pam_message *msg; 2670 struct pam_message *m; 2671 int i; 2672 int k; 2673 int retcode; 2674 struct pam_conv *pam_convp; 2675 2676 if ((retcode = pam_get_item(pamh, PAM_CONV, 2677 (void **)&pam_convp)) != PAM_SUCCESS) { 2678 return (retcode); 2679 } 2680 2681 /* 2682 * When pam_set_item() is called to set PAM_CONV and the 2683 * item is NULL, memset(pip->pi_addr, 0, size) is called. 2684 * So at this point, we should check whether pam_convp->conv 2685 * is NULL or not. 2686 */ 2687 if ((pam_convp == NULL) || (pam_convp->conv == NULL)) 2688 return (PAM_SYSTEM_ERR); 2689 2690 i = 0; 2691 k = num_msg; 2692 2693 msg = (struct pam_message *)calloc(num_msg, 2694 sizeof (struct pam_message)); 2695 if (msg == NULL) { 2696 return (PAM_BUF_ERR); 2697 } 2698 m = msg; 2699 2700 while (k--) { 2701 /* 2702 * fill out the message structure to display prompt message 2703 */ 2704 m->msg_style = msg_style; 2705 m->msg = messages[i]; 2706 pam_trace(PAM_DEBUG_CONV, 2707 "pam_conv_msg(%p:%d[%d]=%s)", 2708 (void *)pamh, msg_style, i, messages[i]); 2709 m++; 2710 i++; 2711 } 2712 2713 /* 2714 * The UNIX pam modules always calls __pam_get_authtok() and 2715 * __pam_display_msg() with a NULL pointer as the conv_apdp. 2716 * In case the conv_apdp is NULL and the pam_convp->appdata_ptr 2717 * is not NULL, we should pass the pam_convp->appdata_ptr 2718 * to the conversation function. 2719 */ 2720 if (conv_apdp == NULL && pam_convp->appdata_ptr != NULL) 2721 conv_apdp = pam_convp->appdata_ptr; 2722 2723 /* 2724 * Call conv function to display the prompt. 2725 */ 2726 retcode = (pam_convp->conv)(num_msg, &msg, ret_respp, conv_apdp); 2727 pam_trace(PAM_DEBUG_CONV, 2728 "pam_conv_resp(%p pam_conv = %s) ret_respp = %p", 2729 (void *)pamh, pam_strerror(pamh, retcode), (void *)ret_respp); 2730 if (*ret_respp == NULL) { 2731 pam_trace(PAM_DEBUG_CONV, 2732 "pam_conv_resp(%p No response requested)", (void *)pamh); 2733 } else if ((pam_debug & (PAM_DEBUG_CONV | PAM_DEBUG_AUTHTOK)) != 0) { 2734 struct pam_response *r = *ret_respp; 2735 2736 for (i = 0; i < num_msg; i++, r++) { 2737 if (r->resp == NULL) { 2738 pam_trace(PAM_DEBUG_CONV, 2739 "pam_conv_resp(%p:" 2740 "[%d] NULL response string)", 2741 (void *)pamh, i); 2742 } else { 2743 if (msg_style == PAM_PROMPT_ECHO_OFF) { 2744 #ifdef DEBUG 2745 pam_trace(PAM_DEBUG_AUTHTOK, 2746 "pam_conv_resp(%p:[%d]=%s, " 2747 "code=%d)", 2748 (void *)pamh, i, r->resp, 2749 r->resp_retcode); 2750 #endif /* DEBUG */ 2751 pam_trace(PAM_DEBUG_CONV, 2752 "pam_conv_resp(%p:[%d] len=%lu, " 2753 "code=%d)", 2754 (void *)pamh, i, 2755 (ulong_t)strlen(r->resp), 2756 r->resp_retcode); 2757 } else { 2758 pam_trace(PAM_DEBUG_CONV, 2759 "pam_conv_resp(%p:[%d]=%s, " 2760 "code=%d)", 2761 (void *)pamh, i, r->resp, 2762 r->resp_retcode); 2763 } 2764 } 2765 } 2766 } 2767 2768 if (msg) 2769 free(msg); 2770 return (retcode); 2771 } 2772 2773 /* 2774 * __pam_display_msg(): 2775 * display message by calling the call back functions 2776 * provided by the application through "pam_conv" structure 2777 */ 2778 2779 int 2780 __pam_display_msg(pam_handle_t *pamh, int msg_style, int num_msg, 2781 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE], void *conv_apdp) 2782 { 2783 struct pam_response *ret_respp = NULL; 2784 2785 return (do_conv(pamh, msg_style, num_msg, messages, 2786 conv_apdp, &ret_respp)); 2787 } 2788 2789 /* 2790 * __pam_get_authtok() 2791 * retrieves a password of at most PASS_MAX length from the pam 2792 * handle (pam_get_item) or from the input stream (do_conv). 2793 * 2794 * This function allocates memory for the new authtok. 2795 * Applications calling this function are responsible for 2796 * freeing this memory. 2797 * 2798 * If "source" is 2799 * PAM_HANDLE 2800 * and "type" is: 2801 * PAM_AUTHTOK - password is taken from pam handle (PAM_AUTHTOK) 2802 * PAM_OLDAUTHTOK - password is taken from pam handle (PAM_OLDAUTHTOK) 2803 * 2804 * If "source" is 2805 * PAM_PROMPT 2806 * and "type" is: 2807 * 0: Prompt for new passwd, do not even attempt 2808 * to store it in the pam handle. 2809 * PAM_AUTHTOK: Prompt for new passwd, store in pam handle as 2810 * PAM_AUTHTOK item if this value is not already set. 2811 * PAM_OLDAUTHTOK: Prompt for new passwd, store in pam handle as 2812 * PAM_OLDAUTHTOK item if this value is not 2813 * already set. 2814 */ 2815 int 2816 __pam_get_authtok(pam_handle_t *pamh, int source, int type, char *prompt, 2817 char **authtok) 2818 { 2819 int error = PAM_SYSTEM_ERR; 2820 char *new_password = NULL; 2821 struct pam_response *ret_resp = NULL; 2822 char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; 2823 2824 if ((*authtok = calloc(PASS_MAX+1, sizeof (char))) == NULL) 2825 return (PAM_BUF_ERR); 2826 2827 if (prompt == NULL) 2828 prompt = dgettext(TEXT_DOMAIN, "password: "); 2829 2830 switch (source) { 2831 case PAM_HANDLE: 2832 2833 /* get password from pam handle item list */ 2834 2835 switch (type) { 2836 case PAM_AUTHTOK: 2837 case PAM_OLDAUTHTOK: 2838 2839 if ((error = pam_get_item(pamh, type, 2840 (void **)&new_password)) != PAM_SUCCESS) 2841 goto err_ret; 2842 2843 if (new_password == NULL || new_password[0] == '\0') { 2844 free(*authtok); 2845 *authtok = NULL; 2846 } else { 2847 (void) strlcpy(*authtok, new_password, 2848 PASS_MAX+1); 2849 } 2850 break; 2851 default: 2852 __pam_log(LOG_AUTH | LOG_ERR, 2853 "__pam_get_authtok() invalid type: %d", type); 2854 error = PAM_SYMBOL_ERR; 2855 goto err_ret; 2856 } 2857 break; 2858 case PAM_PROMPT: 2859 2860 /* 2861 * Prompt for new password and save in pam handle item list 2862 * if the that item is not already set. 2863 */ 2864 2865 (void) strncpy(messages[0], prompt, sizeof (messages[0])); 2866 if ((error = do_conv(pamh, PAM_PROMPT_ECHO_OFF, 1, messages, 2867 NULL, &ret_resp)) != PAM_SUCCESS) 2868 goto err_ret; 2869 2870 if (ret_resp->resp == NULL) { 2871 /* getpass didn't return anything */ 2872 error = PAM_SYSTEM_ERR; 2873 goto err_ret; 2874 } 2875 2876 /* save the new password if this item was NULL */ 2877 if (type) { 2878 if ((error = pam_get_item(pamh, type, 2879 (void **)&new_password)) != PAM_SUCCESS) { 2880 free_resp(1, ret_resp); 2881 goto err_ret; 2882 } 2883 if (new_password == NULL) 2884 (void) pam_set_item(pamh, type, ret_resp->resp); 2885 } 2886 2887 (void) strlcpy(*authtok, ret_resp->resp, PASS_MAX+1); 2888 free_resp(1, ret_resp); 2889 break; 2890 default: 2891 __pam_log(LOG_AUTH | LOG_ERR, 2892 "__pam_get_authtok() invalid source: %d", source); 2893 error = PAM_SYMBOL_ERR; 2894 goto err_ret; 2895 } 2896 2897 return (PAM_SUCCESS); 2898 2899 err_ret: 2900 bzero(*authtok, PASS_MAX+1); 2901 free(*authtok); 2902 *authtok = NULL; 2903 return (error); 2904 } 2905