source3/auth/pampass.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    PAM Password checking
   4    Copyright (C) Andrew Tridgell 1992-2001
   5    Copyright (C) John H Terpsta 1999-2001
   6    Copyright (C) Andrew Bartlett 2001
   7    Copyright (C) Jeremy Allison 2001
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * This module provides PAM based functions for validation of
  25  * username/password pairs, account managment, session and access control.
  26  * Note: SMB password checking is done in smbpass.c
  27  */
  28
  29 #include "includes.h"
  30 #include "../libcli/auth/pam_errors.h"
  31
  32 #undef DBGC_CLASS
  33 #define DBGC_CLASS DBGC_AUTH
  34
  35 #ifdef WITH_PAM
  36
  37 /*******************************************************************
  38  * Handle PAM authentication
  39  *      - Access, Authentication, Session, Password
  40  *   Note: See PAM Documentation and refer to local system PAM implementation
  41  *   which determines what actions/limitations/allowances become affected.
  42  *********************************************************************/
  43
  44 #if defined(HAVE_SECURITY_PAM_APPL_H)
  45 #include <security/pam_appl.h>
  46 #elif defined(HAVE_PAM_PAM_APPL_H)
  47 #include <pam/pam_appl.h>
  48 #endif
  49
  50 /*
  51  * Structure used to communicate between the conversation function
  52  * and the server_login/change password functions.
  53  */
  54
  55 struct smb_pam_userdata {
  56         const char *PAM_username;
  57         const char *PAM_password;
  58         const char *PAM_newpassword;
  59 };
  60
  61 typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
  62
  63 static char *smb_pam_copy_string(const char *s)
  64 {
  65         if (s == NULL) {
  66                 return NULL;
  67         }
  68         return SMB_STRDUP(s);
  69 }
  70
  71 static char *smb_pam_copy_fstring(const char *s)
  72 {
  73         if (s[0] == '\0') {
  74                 return NULL;
  75         }
  76         return SMB_STRDUP(s);
  77 }
  78
  79 /*******************************************************************
  80  PAM error handler.
  81  *********************************************************************/
  82
  83 static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
  84 {
  85
  86         if( pam_error != PAM_SUCCESS) {
  87                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  88                                 msg, pam_strerror(pamh, pam_error)));
  89                 return False;
  90         }
  91         return True;
  92 }
  93
  94 /*******************************************************************
  95  This function is a sanity check, to make sure that we NEVER report
  96  failure as sucess.
  97 *********************************************************************/
  98
  99 static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
 100                                             const char *msg, int dbglvl,
 101                                             NTSTATUS *nt_status)
 102 {
 103         *nt_status = pam_to_nt_status(pam_error);
 104
 105         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
 106                 return True;
 107
 108         if (NT_STATUS_IS_OK(*nt_status)) {
 109                 /* Complain LOUDLY */
 110                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
 111 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
 112                 *nt_status = NT_STATUS_LOGON_FAILURE;
 113         }
 114         return False;
 115 }
 116
 117 /*
 118  * PAM conversation function
 119  * Here we assume (for now, at least) that echo on means login name, and
 120  * echo off means password.
 121  */
 122
 123 static int smb_pam_conv(int num_msg,
 124                     const struct pam_message **msg,
 125                     struct pam_response **resp,
 126                     void *appdata_ptr)
 127 {
 128         int replies = 0;
 129         struct pam_response *reply = NULL;
 130         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 131
 132         *resp = NULL;
 133
 134         if (num_msg <= 0)
 135                 return PAM_CONV_ERR;
 136
 137         /*
 138          * Apparantly HPUX has a buggy PAM that doesn't support the
 139          * appdata_ptr. Fail if this is the case. JRA.
 140          */
 141
 142         if (udp == NULL) {
 143                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 144                 return PAM_CONV_ERR;
 145         }
 146
 147         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 148         if (!reply)
 149                 return PAM_CONV_ERR;
 150
 151         memset(reply, '\0', sizeof(struct pam_response) * num_msg);
 152
 153         for (replies = 0; replies < num_msg; replies++) {
 154                 switch (msg[replies]->msg_style) {
 155                         case PAM_PROMPT_ECHO_ON:
 156                                 reply[replies].resp_retcode = PAM_SUCCESS;
 157                                 reply[replies].resp = smb_pam_copy_string(
 158                                         udp->PAM_username);
 159                                 /* PAM frees resp */
 160                                 break;
 161
 162                         case PAM_PROMPT_ECHO_OFF:
 163                                 reply[replies].resp_retcode = PAM_SUCCESS;
 164                                 reply[replies].resp = smb_pam_copy_string(
 165                                         udp->PAM_password);
 166                                 /* PAM frees resp */
 167                                 break;
 168
 169                         case PAM_TEXT_INFO:
 170                                 /* fall through */
 171
 172                         case PAM_ERROR_MSG:
 173                                 /* ignore it... */
 174                                 reply[replies].resp_retcode = PAM_SUCCESS;
 175                                 reply[replies].resp = NULL;
 176                                 break;
 177
 178                         default:
 179                                 /* Must be an error of some sort... */
 180                                 SAFE_FREE(reply);
 181                                 return PAM_CONV_ERR;
 182                 }
 183         }
 184         if (reply)
 185                 *resp = reply;
 186         return PAM_SUCCESS;
 187 }
 188
 189 /*
 190  * PAM password change conversation function
 191  * Here we assume (for now, at least) that echo on means login name, and
 192  * echo off means password.
 193  */
 194
 195 static void special_char_sub(char *buf)
 196 {
 197         all_string_sub(buf, "\\n", "", 0);
 198         all_string_sub(buf, "\\r", "", 0);
 199         all_string_sub(buf, "\\s", " ", 0);
 200         all_string_sub(buf, "\\t", "\t", 0);
 201 }
 202
 203 static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
 204 {
 205         fstring_sub(buf, "%u", username);
 206         all_string_sub(buf, "%o", oldpass, sizeof(fstring));
 207         all_string_sub(buf, "%n", newpass, sizeof(fstring));
 208 }
 209
 210
 211 struct chat_struct {
 212         struct chat_struct *next, *prev;
 213         fstring prompt;
 214         fstring reply;
 215 };
 216
 217 /**************************************************************
 218  Create a linked list containing chat data.
 219 ***************************************************************/
 220
 221 static struct chat_struct *make_pw_chat(const char *p)
 222 {
 223         char *prompt;
 224         char *reply;
 225         struct chat_struct *list = NULL;
 226         struct chat_struct *t;
 227         TALLOC_CTX *frame = talloc_stackframe();
 228
 229         while (1) {
 230                 t = SMB_MALLOC_P(struct chat_struct);
 231                 if (!t) {
 232                         DEBUG(0,("make_pw_chat: malloc failed!\n"));
 233                         TALLOC_FREE(frame);
 234                         return NULL;
 235                 }
 236
 237                 ZERO_STRUCTP(t);
 238
 239                 DLIST_ADD_END(list, t, struct chat_struct*);
 240
 241                 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
 242                         break;
 243                 }
 244
 245                 if (strequal(prompt,".")) {
 246                         fstrcpy(prompt,"*");
 247                 }
 248
 249                 special_char_sub(prompt);
 250                 fstrcpy(t->prompt, prompt);
 251                 strlower_m(t->prompt);
 252                 trim_char(t->prompt, ' ', ' ');
 253
 254                 if (!next_token_talloc(frame, &p, &reply, NULL)) {
 255                         break;
 256                 }
 257
 258                 if (strequal(reply,".")) {
 259                         fstrcpy(reply,"");
 260                 }
 261
 262                 special_char_sub(reply);
 263                 fstrcpy(t->reply, reply);
 264                 strlower_m(t->reply);
 265                 trim_char(t->reply, ' ', ' ');
 266
 267         }
 268         TALLOC_FREE(frame);
 269         return list;
 270 }
 271
 272 static void free_pw_chat(struct chat_struct *list)
 273 {
 274     while (list) {
 275         struct chat_struct *old_head = list;
 276         DLIST_REMOVE(list, list);
 277         SAFE_FREE(old_head);
 278     }
 279 }
 280
 281 static int smb_pam_passchange_conv(int num_msg,
 282                                 const struct pam_message **msg,
 283                                 struct pam_response **resp,
 284                                 void *appdata_ptr)
 285 {
 286         int replies = 0;
 287         struct pam_response *reply = NULL;
 288         fstring current_prompt;
 289         fstring current_reply;
 290         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 291         struct chat_struct *pw_chat;
 292         struct chat_struct *t;
 293         bool found;
 294         *resp = NULL;
 295
 296         DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
 297
 298         if (num_msg <= 0)
 299                 return PAM_CONV_ERR;
 300
 301         if ((pw_chat = make_pw_chat(lp_passwd_chat())) == NULL)
 302                 return PAM_CONV_ERR;
 303
 304         /*
 305          * Apparantly HPUX has a buggy PAM that doesn't support the
 306          * appdata_ptr. Fail if this is the case. JRA.
 307          */
 308
 309         if (udp == NULL) {
 310                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 311                 free_pw_chat(pw_chat);
 312                 return PAM_CONV_ERR;
 313         }
 314
 315         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 316         if (!reply) {
 317                 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
 318                 free_pw_chat(pw_chat);
 319                 return PAM_CONV_ERR;
 320         }
 321
 322         for (replies = 0; replies < num_msg; replies++) {
 323                 found = False;
 324                 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
 325                 switch (msg[replies]->msg_style) {
 326                 case PAM_PROMPT_ECHO_ON:
 327                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 328                         fstrcpy(current_prompt, msg[replies]->msg);
 329                         trim_char(current_prompt, ' ', ' ');
 330                         for (t=pw_chat; t; t=t->next) {
 331
 332                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
 333                                                 t->prompt, current_prompt ));
 334
 335                                 if (unix_wild_match(t->prompt, current_prompt)) {
 336                                         fstrcpy(current_reply, t->reply);
 337                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
 338                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 339 #ifdef DEBUG_PASSWORD
 340                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actually sent: %s\n", current_reply));
 341 #endif
 342                                         reply[replies].resp_retcode = PAM_SUCCESS;
 343                                         reply[replies].resp = smb_pam_copy_fstring(
 344                                                 current_reply);
 345                                         found = True;
 346                                         break;
 347                                 }
 348                         }
 349                         /* PAM frees resp */
 350                         if (!found) {
 351                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 352                                 free_pw_chat(pw_chat);
 353                                 SAFE_FREE(reply);
 354                                 return PAM_CONV_ERR;
 355                         }
 356                         break;
 357
 358                 case PAM_PROMPT_ECHO_OFF:
 359                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 360                         fstrcpy(current_prompt, msg[replies]->msg);
 361                         trim_char(current_prompt, ' ', ' ');
 362                         for (t=pw_chat; t; t=t->next) {
 363
 364                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
 365                                                 t->prompt, current_prompt ));
 366
 367                                 if (unix_wild_match(t->prompt, current_prompt)) {
 368                                         fstrcpy(current_reply, t->reply);
 369                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
 370                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 371                                         reply[replies].resp_retcode = PAM_SUCCESS;
 372                                         reply[replies].resp = smb_pam_copy_fstring(
 373                                                 current_reply);
 374 #ifdef DEBUG_PASSWORD
 375                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actually sent: %s\n", current_reply));
 376 #endif
 377                                         found = True;
 378                                         break;
 379                                 }
 380                         }
 381                         /* PAM frees resp */
 382
 383                         if (!found) {
 384                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 385                                 free_pw_chat(pw_chat);
 386                                 SAFE_FREE(reply);
 387                                 return PAM_CONV_ERR;
 388                         }
 389                         break;
 390
 391                 case PAM_TEXT_INFO:
 392                         /* fall through */
 393
 394                 case PAM_ERROR_MSG:
 395                         /* ignore it... */
 396                         reply[replies].resp_retcode = PAM_SUCCESS;
 397                         reply[replies].resp = NULL;
 398                         break;
 399
 400                 default:
 401                         /* Must be an error of some sort... */
 402                         free_pw_chat(pw_chat);
 403                         SAFE_FREE(reply);
 404                         return PAM_CONV_ERR;
 405                 }
 406         }
 407
 408         free_pw_chat(pw_chat);
 409         if (reply)
 410                 *resp = reply;
 411         return PAM_SUCCESS;
 412 }
 413
 414 /***************************************************************************
 415  Free up a malloced pam_conv struct.
 416 ****************************************************************************/
 417
 418 static void smb_free_pam_conv(struct pam_conv *pconv)
 419 {
 420         if (pconv)
 421                 SAFE_FREE(pconv->appdata_ptr);
 422
 423         SAFE_FREE(pconv);
 424 }
 425
 426 /***************************************************************************
 427  Allocate a pam_conv struct.
 428 ****************************************************************************/
 429
 430 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
 431                                         const char *passwd, const char *newpass)
 432 {
 433         struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
 434         struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
 435
 436         if (pconv == NULL || udp == NULL) {
 437                 SAFE_FREE(pconv);
 438                 SAFE_FREE(udp);
 439                 return NULL;
 440         }
 441
 442         udp->PAM_username = user;
 443         udp->PAM_password = passwd;
 444         udp->PAM_newpassword = newpass;
 445
 446         pconv->conv = smb_pam_conv_fnptr;
 447         pconv->appdata_ptr = (void *)udp;
 448         return pconv;
 449 }
 450
 451 /*
 452  * PAM Closing out cleanup handler
 453  */
 454
 455 static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 456 {
 457         int pam_error;
 458
 459         smb_free_pam_conv(smb_pam_conv_ptr);
 460
 461         if( pamh != NULL ) {
 462                 pam_error = pam_end(pamh, 0);
 463                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 464                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 465                         return True;
 466                 }
 467         }
 468         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 469         return False;
 470 }
 471
 472 /*
 473  * Start PAM authentication for specified account
 474  */
 475
 476 static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
 477 {
 478         int pam_error;
 479
 480         *pamh = (pam_handle_t *)NULL;
 481
 482         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 483
 484         pam_error = pam_start("samba", user, pconv, pamh);
 485         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 486                 *pamh = (pam_handle_t *)NULL;
 487                 return False;
 488         }
 489
 490 #if HAVE_PAM_RHOST
 491         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 492         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 493         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 494                 smb_pam_end(*pamh, pconv);
 495                 *pamh = (pam_handle_t *)NULL;
 496                 return False;
 497         }
 498 #endif
 499 #if HAVE_PAM_TTY
 500         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 501         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 502         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 503                 smb_pam_end(*pamh, pconv);
 504                 *pamh = (pam_handle_t *)NULL;
 505                 return False;
 506         }
 507 #endif
 508         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 509         return True;
 510 }
 511
 512 /*
 513  * PAM Authentication Handler
 514  */
 515 static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
 516 {
 517         int pam_error;
 518         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 519
 520         /*
 521          * To enable debugging set in /etc/pam.d/samba:
 522          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 523          */
 524
 525         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 526         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 527         switch( pam_error ){
 528                 case PAM_AUTH_ERR:
 529                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
 530                         break;
 531                 case PAM_CRED_INSUFFICIENT:
 532                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 533                         break;
 534                 case PAM_AUTHINFO_UNAVAIL:
 535                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 536                         break;
 537                 case PAM_USER_UNKNOWN:
 538                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 539                         break;
 540                 case PAM_MAXTRIES:
 541                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 542                         break;
 543                 case PAM_ABORT:
 544                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 545                         break;
 546                 case PAM_SUCCESS:
 547                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 548                         break;
 549                 default:
 550                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 551                         break;
 552         }
 553
 554         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 555         return nt_status;
 556 }
 557
 558 /*
 559  * PAM Account Handler
 560  */
 561 static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
 562 {
 563         int pam_error;
 564         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 565
 566         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 567         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 568         switch( pam_error ) {
 569                 case PAM_AUTHTOK_EXPIRED:
 570                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 571                         break;
 572                 case PAM_ACCT_EXPIRED:
 573                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 574                         break;
 575                 case PAM_AUTH_ERR:
 576                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 577                         break;
 578                 case PAM_PERM_DENIED:
 579                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 580                         break;
 581                 case PAM_USER_UNKNOWN:
 582                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 583                         break;
 584                 case PAM_SUCCESS:
 585                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 586                         break;
 587                 default:
 588                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 589                         break;
 590         }
 591
 592         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 593         return nt_status;
 594 }
 595
 596 /*
 597  * PAM Credential Setting
 598  */
 599
 600 static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
 601 {
 602         int pam_error;
 603         NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
 604
 605         /*
 606          * This will allow samba to aquire a kerberos token. And, when
 607          * exporting an AFS cell, be able to /write/ to this cell.
 608          */
 609
 610         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 611         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 612         switch( pam_error ) {
 613                 case PAM_CRED_UNAVAIL:
 614                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 615                         break;
 616                 case PAM_CRED_EXPIRED:
 617                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 618                         break;
 619                 case PAM_USER_UNKNOWN:
 620                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 621                         break;
 622                 case PAM_CRED_ERR:
 623                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 624                         break;
 625                 case PAM_SUCCESS:
 626                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 627                         break;
 628                 default:
 629                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 630                         break;
 631         }
 632
 633         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 634         return nt_status;
 635 }
 636
 637 /*
 638  * PAM Internal Session Handler
 639  */
 640 static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
 641 {
 642         int pam_error;
 643
 644 #if HAVE_PAM_TTY
 645         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 646         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 647         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 648                 return False;
 649 #endif
 650
 651         if (flag) {
 652                 pam_error = pam_open_session(pamh, PAM_SILENT);
 653                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 654                         return False;
 655         } else {
 656                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 657                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 658                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 659                         return False;
 660         }
 661         return (True);
 662 }
 663
 664 /*
 665  * Internal PAM Password Changer.
 666  */
 667
 668 static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
 669 {
 670         int pam_error;
 671
 672         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 673
 674         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 675
 676         switch( pam_error ) {
 677         case PAM_AUTHTOK_ERR:
 678                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 679                 break;
 680
 681         /* This doesn't seem to be defined on Solaris. JRA */
 682 #ifdef PAM_AUTHTOK_RECOVER_ERR
 683         case PAM_AUTHTOK_RECOVER_ERR:
 684                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 685                 break;
 686 #endif
 687
 688         case PAM_AUTHTOK_LOCK_BUSY:
 689                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 690                 break;
 691         case PAM_AUTHTOK_DISABLE_AGING:
 692                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 693                 break;
 694         case PAM_PERM_DENIED:
 695                 DEBUG(0, ("PAM: Permission denied.\n"));
 696                 break;
 697         case PAM_TRY_AGAIN:
 698                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 699                 break;
 700         case PAM_USER_UNKNOWN:
 701                 DEBUG(0, ("PAM: User not known to PAM\n"));
 702                 break;
 703         case PAM_SUCCESS:
 704                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 705                 break;
 706         default:
 707                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 708         }
 709
 710         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 711                 return False;
 712         }
 713
 714         /* If this point is reached, the password has changed. */
 715         return True;
 716 }
 717
 718 /*
 719  * PAM Externally accessible Session handler
 720  */
 721
 722 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 723 {
 724         pam_handle_t *pamh = NULL;
 725         struct pam_conv *pconv = NULL;
 726
 727         /* Ignore PAM if told to. */
 728
 729         if (!lp_obey_pam_restrictions())
 730                 return True;
 731
 732         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 733                 return False;
 734
 735         if (!smb_pam_start(&pamh, user, rhost, pconv))
 736                 return False;
 737
 738         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 739                 smb_pam_end(pamh, pconv);
 740                 return False;
 741         }
 742
 743         return smb_pam_end(pamh, pconv);
 744 }
 745
 746 /*
 747  * PAM Externally accessible Session handler
 748  */
 749
 750 bool smb_pam_close_session(char *user, char *tty, char *rhost)
 751 {
 752         pam_handle_t *pamh = NULL;
 753         struct pam_conv *pconv = NULL;
 754
 755         /* Ignore PAM if told to. */
 756
 757         if (!lp_obey_pam_restrictions())
 758                 return True;
 759
 760         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 761                 return False;
 762
 763         if (!smb_pam_start(&pamh, user, rhost, pconv))
 764                 return False;
 765
 766         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 767                 smb_pam_end(pamh, pconv);
 768                 return False;
 769         }
 770
 771         return smb_pam_end(pamh, pconv);
 772 }
 773
 774 /*
 775  * PAM Externally accessible Account handler
 776  */
 777
 778 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 779 {
 780         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 781         pam_handle_t *pamh = NULL;
 782         struct pam_conv *pconv = NULL;
 783
 784         /* Ignore PAM if told to. */
 785
 786         if (!lp_obey_pam_restrictions())
 787                 return NT_STATUS_OK;
 788
 789         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 790                 return NT_STATUS_NO_MEMORY;
 791
 792         if (!smb_pam_start(&pamh, user, rhost, pconv))
 793                 return NT_STATUS_ACCOUNT_DISABLED;
 794
 795         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
 796                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 797
 798         smb_pam_end(pamh, pconv);
 799         return nt_status;
 800 }
 801
 802 /*
 803  * PAM Password Validation Suite
 804  */
 805
 806 NTSTATUS smb_pam_passcheck(const char * user, const char * rhost,
 807                            const char * password)
 808 {
 809         pam_handle_t *pamh = NULL;
 810         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 811         struct pam_conv *pconv = NULL;
 812
 813         /*
 814          * Note we can't ignore PAM here as this is the only
 815          * way of doing auths on plaintext passwords when
 816          * compiled --with-pam.
 817          */
 818
 819         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 820                 return NT_STATUS_LOGON_FAILURE;
 821
 822         if (!smb_pam_start(&pamh, user, rhost, pconv))
 823                 return NT_STATUS_LOGON_FAILURE;
 824
 825         if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
 826                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 827                 smb_pam_end(pamh, pconv);
 828                 return nt_status;
 829         }
 830
 831         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
 832                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 833                 smb_pam_end(pamh, pconv);
 834                 return nt_status;
 835         }
 836
 837         if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
 838                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 839                 smb_pam_end(pamh, pconv);
 840                 return nt_status;
 841         }
 842
 843         smb_pam_end(pamh, pconv);
 844         return nt_status;
 845 }
 846
 847 /*
 848  * PAM Password Change Suite
 849  */
 850
 851 bool smb_pam_passchange(const char *user, const char *rhost,
 852                         const char *oldpassword, const char *newpassword)
 853 {
 854         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 855         struct pam_conv *pconv = NULL;
 856         pam_handle_t *pamh = NULL;
 857
 858         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 859                 return False;
 860
 861         if(!smb_pam_start(&pamh, user, rhost, pconv))
 862                 return False;
 863
 864         if (!smb_pam_chauthtok(pamh, user)) {
 865                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 866                 smb_pam_end(pamh, pconv);
 867                 return False;
 868         }
 869
 870         return smb_pam_end(pamh, pconv);
 871 }
 872
 873 #else
 874
 875 /* If PAM not used, no PAM restrictions on accounts. */
 876 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 877 {
 878         return NT_STATUS_OK;
 879 }
 880
 881 /* If PAM not used, also no PAM restrictions on sessions. */
 882 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 883 {
 884         return True;
 885 }
 886
 887 /* If PAM not used, also no PAM restrictions on sessions. */
 888 bool smb_pam_close_session(char *in_user, char *tty, char *rhost)
 889 {
 890         return True;
 891 }
 892 #endif /* WITH_PAM */