source/passdb/pampass.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.2.
   4    PAM Password checking
   5    Copyright (C) Andrew Tridgell 1992-2001
   6    Copyright (C) John H Terpsta 1999-2001
   7    Copyright (C) Andrew Bartlett 2001
   8    Copyright (C) Jeremy Allison 2001
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 /*
  26  * This module provides PAM based functions for validation of
  27  * username/password pairs, account managment, session and access control.
  28  * Note: SMB password checking is done in smbpass.c
  29  */
  30
  31 #include "includes.h"
  32
  33 extern int DEBUGLEVEL;
  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 #include <security/pam_appl.h>
  45
  46 /*
  47  * Structure used to communicate between the conversation function
  48  * and the server_login/change password functions.
  49  */
  50
  51 struct smb_pam_userdata {
  52         char *PAM_username;
  53         char *PAM_password;
  54         char *PAM_newpassword;
  55 };
  56
  57 typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
  58
  59 /*
  60  *  Macros to help make life easy
  61  */
  62 #define COPY_STRING(s) (s) ? strdup(s) : NULL
  63
  64 /*******************************************************************
  65  PAM error handler.
  66  *********************************************************************/
  67
  68 static BOOL smb_pam_error_handler(pam_handle_t *pamh, int pam_error, char *msg, int dbglvl)
  69 {
  70
  71         if( pam_error != PAM_SUCCESS) {
  72                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  73                                 msg, pam_strerror(pamh, pam_error)));
  74                 return False;
  75         }
  76         return True;
  77 }
  78
  79 /*******************************************************************
  80  This function is a sanity check, to make sure that we NEVER report
  81  failure as sucess.
  82 *********************************************************************/
  83
  84 static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
  85                                                         char *msg, int dbglvl, uint32 *nt_status)
  86 {
  87         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
  88                 return True;
  89
  90         if (*nt_status == NT_STATUS_NOPROBLEMO) {
  91                 /* Complain LOUDLY */
  92                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
  93 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
  94                 *nt_status = NT_STATUS_LOGON_FAILURE;
  95         }
  96         return False;
  97 }
  98
  99 /*
 100  * PAM conversation function
 101  * Here we assume (for now, at least) that echo on means login name, and
 102  * echo off means password.
 103  */
 104
 105 static int smb_pam_conv(int num_msg,
 106                     const struct pam_message **msg,
 107                     struct pam_response **resp,
 108                     void *appdata_ptr)
 109 {
 110         int replies = 0;
 111         struct pam_response *reply = NULL;
 112         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 113
 114         *resp = NULL;
 115
 116         reply = malloc(sizeof(struct pam_response) * num_msg);
 117         if (!reply)
 118                 return PAM_CONV_ERR;
 119
 120         for (replies = 0; replies < num_msg; replies++) {
 121                 switch (msg[replies]->msg_style) {
 122                         case PAM_PROMPT_ECHO_ON:
 123                                 reply[replies].resp_retcode = PAM_SUCCESS;
 124                                 reply[replies].resp = COPY_STRING(udp->PAM_username);
 125                                 /* PAM frees resp */
 126                                 break;
 127
 128                         case PAM_PROMPT_ECHO_OFF:
 129                                 reply[replies].resp_retcode = PAM_SUCCESS;
 130                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 131                                 /* PAM frees resp */
 132                                 break;
 133
 134                         case PAM_TEXT_INFO:
 135                                 /* fall through */
 136
 137                         case PAM_ERROR_MSG:
 138                                 /* ignore it... */
 139                                 reply[replies].resp_retcode = PAM_SUCCESS;
 140                                 reply[replies].resp = NULL;
 141                                 break;
 142
 143                         default:
 144                                 /* Must be an error of some sort... */
 145                                 free(reply);
 146                                 return PAM_CONV_ERR;
 147                 }
 148         }
 149         if (reply)
 150                 *resp = reply;
 151         return PAM_SUCCESS;
 152 }
 153
 154 /*
 155  * PAM password change conversation function
 156  * Here we assume (for now, at least) that echo on means login name, and
 157  * echo off means password.
 158  */
 159
 160 static int smb_pam_passchange_conv(int num_msg,
 161                                 const struct pam_message **msg,
 162                                 struct pam_response **resp,
 163                                 void *appdata_ptr)
 164 {
 165         int replies = 0;
 166         struct pam_response *reply = NULL;
 167         fstring currentpw_prompt;
 168         fstring newpw_prompt;
 169         fstring repeatpw_prompt;
 170         char *p = lp_passwd_chat();
 171         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 172
 173         /* Get the prompts... */
 174
 175         if (!next_token(&p, currentpw_prompt, NULL, sizeof(fstring)))
 176                 return PAM_CONV_ERR;
 177         if (!next_token(&p, newpw_prompt, NULL, sizeof(fstring)))
 178                 return PAM_CONV_ERR;
 179         if (!next_token(&p, repeatpw_prompt, NULL, sizeof(fstring)))
 180                 return PAM_CONV_ERR;
 181
 182         *resp = NULL;
 183
 184         reply = malloc(sizeof(struct pam_response) * num_msg);
 185         if (!reply)
 186                 return PAM_CONV_ERR;
 187
 188         for (replies = 0; replies < num_msg; replies++) {
 189                 switch (msg[replies]->msg_style) {
 190                 case PAM_PROMPT_ECHO_ON:
 191                         reply[replies].resp_retcode = PAM_SUCCESS;
 192                         reply[replies].resp = COPY_STRING(udp->PAM_username);
 193                         /* PAM frees resp */
 194                         break;
 195
 196                 case PAM_PROMPT_ECHO_OFF:
 197                         reply[replies].resp_retcode = PAM_SUCCESS;
 198                         DEBUG(10,("smb_pam_passchange_conv: PAM Replied: %s\n", msg[replies]->msg));
 199                         if (strncmp(currentpw_prompt, msg[replies]->msg, strlen(currentpw_prompt)) == 0) {
 200                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 201                         } else if (strncmp(newpw_prompt, msg[replies]->msg, strlen(newpw_prompt)) == 0) {
 202                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 203                         } else if (strncmp(repeatpw_prompt, msg[replies]->msg, strlen(repeatpw_prompt)) == 0) {
 204                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 205                         } else {
 206                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 207                                 DEBUG(5,("smb_pam_passchange_conv: Prompts available:\n CurrentPW: \"%s\"\n NewPW: \"%s\"\n \
 208 RepeatPW: \"%s\"\n",currentpw_prompt,newpw_prompt,repeatpw_prompt));
 209                         }
 210                         /* PAM frees resp */
 211                         break;
 212
 213                 case PAM_TEXT_INFO:
 214                         /* fall through */
 215
 216                 case PAM_ERROR_MSG:
 217                         /* ignore it... */
 218                         reply[replies].resp_retcode = PAM_SUCCESS;
 219                         reply[replies].resp = NULL;
 220                         break;
 221
 222                 default:
 223                         /* Must be an error of some sort... */
 224                         free(reply);
 225                         reply = NULL;
 226                         return PAM_CONV_ERR;
 227                 }
 228         }
 229
 230         if (reply)
 231                 *resp = reply;
 232         return PAM_SUCCESS;
 233 }
 234
 235 /***************************************************************************
 236  Free up a malloced pam_conv struct.
 237 ****************************************************************************/
 238
 239 static void smb_free_pam_conv(struct pam_conv *pconv)
 240 {
 241         if (pconv)
 242                 safe_free(pconv->appdata_ptr);
 243
 244         safe_free(pconv);
 245 }
 246
 247 /***************************************************************************
 248  Allocate a pam_conv struct.
 249 ****************************************************************************/
 250
 251 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, char *user,
 252                                         char *passwd, char *newpass)
 253 {
 254         struct pam_conv *pconv = (struct pam_conv *)malloc(sizeof(struct pam_conv));
 255         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)malloc(sizeof(struct smb_pam_userdata));
 256
 257         if (pconv == NULL || udp == NULL) {
 258                 safe_free(pconv);
 259                 safe_free(udp);
 260                 return NULL;
 261         }
 262
 263         udp->PAM_username = user;
 264         udp->PAM_password = passwd;
 265         udp->PAM_newpassword = newpass;
 266
 267         pconv->conv = smb_pam_conv_fnptr;
 268         pconv->appdata_ptr = (void *)udp;
 269         return pconv;
 270 }
 271
 272 /*
 273  * PAM Closing out cleanup handler
 274  */
 275
 276 static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 277 {
 278         int pam_error;
 279
 280         smb_free_pam_conv(smb_pam_conv_ptr);
 281
 282         if( pamh != NULL ) {
 283                 pam_error = pam_end(pamh, 0);
 284                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 285                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 286                         return True;
 287                 }
 288         }
 289         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 290         return False;
 291 }
 292
 293 /*
 294  * Start PAM authentication for specified account
 295  */
 296
 297 static BOOL smb_pam_start(pam_handle_t **pamh, char *user, char *rhost, struct pam_conv *pconv)
 298 {
 299         int pam_error;
 300
 301         *pamh = (pam_handle_t *)NULL;
 302
 303         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 304
 305         pam_error = pam_start("samba", user, pconv, pamh);
 306         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 307                 *pamh = (pam_handle_t *)NULL;
 308                 return False;
 309         }
 310
 311         if (rhost == NULL) {
 312                 rhost = client_name();
 313                 if (strequal(rhost,"UNKNOWN"))
 314                         rhost = client_addr();
 315         }
 316
 317 #ifdef PAM_RHOST
 318         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 319         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 320         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 321                 smb_pam_end(*pamh, pconv);
 322                 *pamh = (pam_handle_t *)NULL;
 323                 return False;
 324         }
 325 #endif
 326 #ifdef PAM_TTY
 327         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 328         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 329         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 330                 smb_pam_end(*pamh, pconv);
 331                 *pamh = (pam_handle_t *)NULL;
 332                 return False;
 333         }
 334 #endif
 335         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 336         return True;
 337 }
 338
 339 /*
 340  * PAM Authentication Handler
 341  */
 342 static uint32 smb_pam_auth(pam_handle_t *pamh, char *user)
 343 {
 344         int pam_error;
 345         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 346
 347         /*
 348          * To enable debugging set in /etc/pam.d/samba:
 349          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 350          */
 351
 352         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 353         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 354         switch( pam_error ){
 355                 case PAM_AUTH_ERR:
 356                         DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
 357                         nt_status = NT_STATUS_WRONG_PASSWORD;
 358                         break;
 359                 case PAM_CRED_INSUFFICIENT:
 360                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 361                         nt_status = NT_STATUS_INSUFFICIENT_LOGON_INFO;
 362                         break;
 363                 case PAM_AUTHINFO_UNAVAIL:
 364                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 365                         nt_status = NT_STATUS_LOGON_FAILURE;
 366                         break;
 367                 case PAM_USER_UNKNOWN:
 368                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 369                         nt_status = NT_STATUS_NO_SUCH_USER;
 370                         break;
 371                 case PAM_MAXTRIES:
 372                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 373                         nt_status = NT_STATUS_REMOTE_SESSION_LIMIT;
 374                         break;
 375                 case PAM_ABORT:
 376                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 377                         nt_status = NT_STATUS_LOGON_FAILURE;
 378                         break;
 379                 case PAM_SUCCESS:
 380                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 381                         nt_status = NT_STATUS_NOPROBLEMO;
 382                         break;
 383                 default:
 384                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 385                         nt_status = NT_STATUS_LOGON_FAILURE;
 386                         break;
 387         }
 388
 389         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 390         return nt_status;
 391 }
 392
 393 /*
 394  * PAM Account Handler
 395  */
 396 static uint32 smb_pam_account(pam_handle_t *pamh, char * user)
 397 {
 398         int pam_error;
 399         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 400
 401         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 402         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 403         switch( pam_error ) {
 404                 case PAM_AUTHTOK_EXPIRED:
 405                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 406                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 407                         break;
 408                 case PAM_ACCT_EXPIRED:
 409                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 410                         nt_status = NT_STATUS_ACCOUNT_EXPIRED;
 411                         break;
 412                 case PAM_AUTH_ERR:
 413                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 414                         nt_status = NT_STATUS_LOGON_FAILURE;
 415                         break;
 416                 case PAM_PERM_DENIED:
 417                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 418                         nt_status = NT_STATUS_ACCOUNT_RESTRICTION;
 419                         break;
 420                 case PAM_USER_UNKNOWN:
 421                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 422                         nt_status = NT_STATUS_NO_SUCH_USER;
 423                         break;
 424                 case PAM_SUCCESS:
 425                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 426                         nt_status = NT_STATUS_NOPROBLEMO;
 427                         break;
 428                 default:
 429                         nt_status = NT_STATUS_ACCOUNT_DISABLED;
 430                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 431                         break;
 432         }
 433
 434         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 435         return nt_status;
 436 }
 437
 438 /*
 439  * PAM Credential Setting
 440  */
 441
 442 static uint32 smb_pam_setcred(pam_handle_t *pamh, char * user)
 443 {
 444         int pam_error;
 445         uint32 nt_status = NT_STATUS_NO_TOKEN;
 446
 447         /*
 448          * This will allow samba to aquire a kerberos token. And, when
 449          * exporting an AFS cell, be able to /write/ to this cell.
 450          */
 451
 452         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 453         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 454         switch( pam_error ) {
 455                 case PAM_CRED_UNAVAIL:
 456                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 457                          nt_status = NT_STATUS_NO_TOKEN;
 458                         break;
 459                 case PAM_CRED_EXPIRED:
 460                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 461                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 462                         break;
 463                 case PAM_USER_UNKNOWN:
 464                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 465                         nt_status = NT_STATUS_NO_SUCH_USER;
 466                         break;
 467                 case PAM_CRED_ERR:
 468                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 469                         nt_status = NT_STATUS_LOGON_FAILURE;
 470                         break;
 471                 case PAM_SUCCESS:
 472                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 473                         nt_status = NT_STATUS_NOPROBLEMO;
 474                         break;
 475                 default:
 476                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 477                         nt_status = NT_STATUS_NO_TOKEN;
 478                         break;
 479         }
 480
 481         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 482         return nt_status;
 483 }
 484
 485 /*
 486  * PAM Internal Session Handler
 487  */
 488 static BOOL smb_internal_pam_session(pam_handle_t *pamh, char *user, char *tty, BOOL flag)
 489 {
 490         int pam_error;
 491
 492 #ifdef PAM_TTY
 493         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 494         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 495         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 496                 return False;
 497 #endif
 498
 499         if (flag) {
 500                 pam_error = pam_open_session(pamh, PAM_SILENT);
 501                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 502                         return False;
 503         } else {
 504                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 505                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 506                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 507                         return False;
 508         }
 509         return (True);
 510 }
 511
 512 /*
 513  * Internal PAM Password Changer.
 514  */
 515
 516 static BOOL smb_pam_chauthtok(pam_handle_t *pamh, char * user)
 517 {
 518         int pam_error;
 519
 520         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 521
 522         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 523
 524         switch( pam_error ) {
 525         case PAM_AUTHTOK_ERR:
 526                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 527                 break;
 528         case PAM_AUTHTOK_RECOVER_ERR:
 529                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 530                 break;
 531         case PAM_AUTHTOK_LOCK_BUSY:
 532                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 533                 break;
 534         case PAM_AUTHTOK_DISABLE_AGING:
 535                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 536                 break;
 537         case PAM_PERM_DENIED:
 538                 DEBUG(0, ("PAM: Permission denied.\n"));
 539                 break;
 540         case PAM_TRY_AGAIN:
 541                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 542                 break;
 543         case PAM_USER_UNKNOWN:
 544                 DEBUG(0, ("PAM: User not known to PAM\n"));
 545                 break;
 546         case PAM_SUCCESS:
 547                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 548                 break;
 549         default:
 550                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 551         }
 552
 553         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 554                 return False;
 555         }
 556
 557         /* If this point is reached, the password has changed. */
 558         return True;
 559 }
 560
 561 /*
 562  * PAM Externally accessible Session handler
 563  */
 564
 565 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 566 {
 567         pam_handle_t *pamh = NULL;
 568         struct pam_conv *pconv = NULL;
 569
 570         /* Ignore PAM if told to. */
 571
 572         if (!lp_obey_pam_restrictions())
 573                 return True;
 574
 575         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 576                 return False;
 577
 578         if (!smb_pam_start(&pamh, user, rhost, pconv))
 579                 return False;
 580
 581         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 582                 smb_pam_end(pamh, pconv);
 583                 return False;
 584         }
 585
 586         return smb_pam_end(pamh, pconv);
 587 }
 588
 589 /*
 590  * PAM Externally accessible Session handler
 591  */
 592
 593 BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
 594 {
 595         pam_handle_t *pamh = NULL;
 596         struct pam_conv *pconv = NULL;
 597
 598         /* Ignore PAM if told to. */
 599
 600         if (!lp_obey_pam_restrictions())
 601                 return True;
 602
 603         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 604                 return False;
 605
 606         if (!smb_pam_start(&pamh, user, rhost, pconv))
 607                 return False;
 608
 609         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 610                 smb_pam_end(pamh, pconv);
 611                 return False;
 612         }
 613
 614         return smb_pam_end(pamh, pconv);
 615 }
 616
 617 /*
 618  * PAM Externally accessible Account handler
 619  */
 620
 621 uint32 smb_pam_accountcheck(char * user)
 622 {
 623         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 624         pam_handle_t *pamh = NULL;
 625         struct pam_conv *pconv = NULL;
 626
 627         /* Ignore PAM if told to. */
 628
 629         if (!lp_obey_pam_restrictions())
 630                 return NT_STATUS_NOPROBLEMO;
 631
 632         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 633                 return False;
 634
 635         if (!smb_pam_start(&pamh, user, NULL, pconv))
 636                 return NT_STATUS_ACCOUNT_DISABLED;
 637
 638         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO)
 639                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 640
 641         smb_pam_end(pamh, pconv);
 642         return nt_status;
 643 }
 644
 645 /*
 646  * PAM Password Validation Suite
 647  */
 648
 649 uint32 smb_pam_passcheck(char * user, char * password)
 650 {
 651         pam_handle_t *pamh = NULL;
 652         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 653         struct pam_conv *pconv = NULL;
 654
 655         /*
 656          * Note we can't ignore PAM here as this is the only
 657          * way of doing auths on plaintext passwords when
 658          * compiled --with-pam.
 659          */
 660
 661         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 662                 return False;
 663
 664         if (!smb_pam_start(&pamh, user, NULL, NULL))
 665                 return NT_STATUS_LOGON_FAILURE;
 666
 667         if ((nt_status = smb_pam_auth(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 668                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 669                 smb_pam_end(pamh, pconv);
 670                 return nt_status;
 671         }
 672
 673         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 674                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 675                 smb_pam_end(pamh, pconv);
 676                 return nt_status;
 677         }
 678
 679         if ((nt_status = smb_pam_setcred(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 680                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 681                 smb_pam_end(pamh, pconv);
 682                 return nt_status;
 683         }
 684
 685         smb_pam_end(pamh, pconv);
 686         return nt_status;
 687 }
 688
 689 /*
 690  * PAM Password Change Suite
 691  */
 692
 693 BOOL smb_pam_passchange(char * user, char * oldpassword, char * newpassword)
 694 {
 695         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 696         struct pam_conv *pconv = NULL;
 697         pam_handle_t *pamh = NULL;
 698
 699         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 700                 return False;
 701
 702         if(!smb_pam_start(&pamh, user, NULL, pconv))
 703                 return False;
 704
 705         if (!smb_pam_chauthtok(pamh, user)) {
 706                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 707                 smb_pam_end(pamh, pconv);
 708                 return False;
 709         }
 710
 711         return smb_pam_end(pamh, pconv);
 712 }
 713
 714 #else
 715
 716 /* If PAM not used, no PAM restrictions on accounts. */
 717  uint32 smb_pam_accountcheck(char * user)
 718 {
 719         return NT_STATUS_NOPROBLEMO;
 720 }
 721
 722 /* If PAM not used, also no PAM restrictions on sessions. */
 723  BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 724 {
 725         return True;
 726 }
 727
 728 /* If PAM not used, also no PAM restrictions on sessions. */
 729  BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
 730 {
 731         return True;
 732 }
 733 #endif /* WITH_PAM */