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         if (num_msg <= 0)
 117                 return PAM_CONV_ERR;
 118
 119         /*
 120          * Apparantly HPUX has a buggy PAM that doesn't support the
 121          * appdata_ptr. Fail if this is the case. JRA.
 122          */
 123
 124         if (udp == NULL) {
 125                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 126                 return PAM_CONV_ERR;
 127         }
 128
 129         reply = malloc(sizeof(struct pam_response) * num_msg);
 130         if (!reply)
 131                 return PAM_CONV_ERR;
 132
 133         for (replies = 0; replies < num_msg; replies++) {
 134                 switch (msg[replies]->msg_style) {
 135                         case PAM_PROMPT_ECHO_ON:
 136                                 reply[replies].resp_retcode = PAM_SUCCESS;
 137                                 reply[replies].resp = COPY_STRING(udp->PAM_username);
 138                                 /* PAM frees resp */
 139                                 break;
 140
 141                         case PAM_PROMPT_ECHO_OFF:
 142                                 reply[replies].resp_retcode = PAM_SUCCESS;
 143                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 144                                 /* PAM frees resp */
 145                                 break;
 146
 147                         case PAM_TEXT_INFO:
 148                                 /* fall through */
 149
 150                         case PAM_ERROR_MSG:
 151                                 /* ignore it... */
 152                                 reply[replies].resp_retcode = PAM_SUCCESS;
 153                                 reply[replies].resp = NULL;
 154                                 break;
 155
 156                         default:
 157                                 /* Must be an error of some sort... */
 158                                 free(reply);
 159                                 return PAM_CONV_ERR;
 160                 }
 161         }
 162         if (reply)
 163                 *resp = reply;
 164         return PAM_SUCCESS;
 165 }
 166
 167 /*
 168  * PAM password change conversation function
 169  * Here we assume (for now, at least) that echo on means login name, and
 170  * echo off means password.
 171  */
 172
 173 static int smb_pam_passchange_conv(int num_msg,
 174                                 const struct pam_message **msg,
 175                                 struct pam_response **resp,
 176                                 void *appdata_ptr)
 177 {
 178         int replies = 0;
 179         struct pam_response *reply = NULL;
 180         fstring newpw_prompt;
 181         fstring repeatpw_prompt;
 182         char *p = lp_passwd_chat();
 183         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 184
 185         *resp = NULL;
 186
 187         if (num_msg <= 0)
 188                 return PAM_CONV_ERR;
 189
 190         /*
 191          * Apparantly HPUX has a buggy PAM that doesn't support the
 192          * appdata_ptr. Fail if this is the case. JRA.
 193          */
 194
 195         if (udp == NULL) {
 196                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 197                 return PAM_CONV_ERR;
 198         }
 199
 200         /* Get the prompts. We're running as root so we only get 2 prompts. */
 201
 202         if (!next_token(&p, newpw_prompt, NULL, sizeof(fstring)))
 203                 return PAM_CONV_ERR;
 204         if (!next_token(&p, repeatpw_prompt, NULL, sizeof(fstring)))
 205                 return PAM_CONV_ERR;
 206
 207         reply = malloc(sizeof(struct pam_response) * num_msg);
 208         if (!reply)
 209                 return PAM_CONV_ERR;
 210
 211         for (replies = 0; replies < num_msg; replies++) {
 212                 switch (msg[replies]->msg_style) {
 213                 case PAM_PROMPT_ECHO_ON:
 214                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: Replied: %s\n", msg[replies]->msg));
 215                         reply[replies].resp_retcode = PAM_SUCCESS;
 216                         reply[replies].resp = COPY_STRING(udp->PAM_username);
 217                         /* PAM frees resp */
 218                         break;
 219
 220                 case PAM_PROMPT_ECHO_OFF:
 221                         reply[replies].resp_retcode = PAM_SUCCESS;
 222                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: Replied: %s\n", msg[replies]->msg));
 223                         if (ms_fnmatch( newpw_prompt, msg[replies]->msg) == 0) {
 224                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 225                         } else if (ms_fnmatch(repeatpw_prompt, msg[replies]->msg) == 0) {
 226                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 227                         } else {
 228                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 229                                 DEBUG(5,("smb_pam_passchange_conv: Prompts available:\n NewPW: \"%s\"\n \
 230 RepeatPW: \"%s\"\n",newpw_prompt,repeatpw_prompt));
 231                                 free(reply);
 232                                 reply = NULL;
 233                                 return PAM_CONV_ERR;
 234                         }
 235                         /* PAM frees resp */
 236                         break;
 237
 238                 case PAM_TEXT_INFO:
 239                         /* fall through */
 240
 241                 case PAM_ERROR_MSG:
 242                         /* ignore it... */
 243                         reply[replies].resp_retcode = PAM_SUCCESS;
 244                         reply[replies].resp = NULL;
 245                         break;
 246
 247                 default:
 248                         /* Must be an error of some sort... */
 249                         free(reply);
 250                         reply = NULL;
 251                         return PAM_CONV_ERR;
 252                 }
 253         }
 254
 255         if (reply)
 256                 *resp = reply;
 257         return PAM_SUCCESS;
 258 }
 259
 260 /***************************************************************************
 261  Free up a malloced pam_conv struct.
 262 ****************************************************************************/
 263
 264 static void smb_free_pam_conv(struct pam_conv *pconv)
 265 {
 266         if (pconv)
 267                 safe_free(pconv->appdata_ptr);
 268
 269         safe_free(pconv);
 270 }
 271
 272 /***************************************************************************
 273  Allocate a pam_conv struct.
 274 ****************************************************************************/
 275
 276 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, char *user,
 277                                         char *passwd, char *newpass)
 278 {
 279         struct pam_conv *pconv = (struct pam_conv *)malloc(sizeof(struct pam_conv));
 280         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)malloc(sizeof(struct smb_pam_userdata));
 281
 282         if (pconv == NULL || udp == NULL) {
 283                 safe_free(pconv);
 284                 safe_free(udp);
 285                 return NULL;
 286         }
 287
 288         udp->PAM_username = user;
 289         udp->PAM_password = passwd;
 290         udp->PAM_newpassword = newpass;
 291
 292         pconv->conv = smb_pam_conv_fnptr;
 293         pconv->appdata_ptr = (void *)udp;
 294         return pconv;
 295 }
 296
 297 /*
 298  * PAM Closing out cleanup handler
 299  */
 300
 301 static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 302 {
 303         int pam_error;
 304
 305         smb_free_pam_conv(smb_pam_conv_ptr);
 306
 307         if( pamh != NULL ) {
 308                 pam_error = pam_end(pamh, 0);
 309                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 310                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 311                         return True;
 312                 }
 313         }
 314         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 315         return False;
 316 }
 317
 318 /*
 319  * Start PAM authentication for specified account
 320  */
 321
 322 static BOOL smb_pam_start(pam_handle_t **pamh, char *user, char *rhost, struct pam_conv *pconv)
 323 {
 324         int pam_error;
 325
 326         *pamh = (pam_handle_t *)NULL;
 327
 328         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 329
 330         pam_error = pam_start("samba", user, pconv, pamh);
 331         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 332                 *pamh = (pam_handle_t *)NULL;
 333                 return False;
 334         }
 335
 336         if (rhost == NULL) {
 337                 rhost = client_name();
 338                 if (strequal(rhost,"UNKNOWN"))
 339                         rhost = client_addr();
 340         }
 341
 342 #ifdef PAM_RHOST
 343         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 344         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 345         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 346                 smb_pam_end(*pamh, pconv);
 347                 *pamh = (pam_handle_t *)NULL;
 348                 return False;
 349         }
 350 #endif
 351 #ifdef PAM_TTY
 352         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 353         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 354         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 355                 smb_pam_end(*pamh, pconv);
 356                 *pamh = (pam_handle_t *)NULL;
 357                 return False;
 358         }
 359 #endif
 360         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 361         return True;
 362 }
 363
 364 /*
 365  * PAM Authentication Handler
 366  */
 367 static uint32 smb_pam_auth(pam_handle_t *pamh, char *user)
 368 {
 369         int pam_error;
 370         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 371
 372         /*
 373          * To enable debugging set in /etc/pam.d/samba:
 374          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 375          */
 376
 377         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 378         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 379         switch( pam_error ){
 380                 case PAM_AUTH_ERR:
 381                         DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
 382                         nt_status = NT_STATUS_WRONG_PASSWORD;
 383                         break;
 384                 case PAM_CRED_INSUFFICIENT:
 385                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 386                         nt_status = NT_STATUS_INSUFFICIENT_LOGON_INFO;
 387                         break;
 388                 case PAM_AUTHINFO_UNAVAIL:
 389                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 390                         nt_status = NT_STATUS_LOGON_FAILURE;
 391                         break;
 392                 case PAM_USER_UNKNOWN:
 393                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 394                         nt_status = NT_STATUS_NO_SUCH_USER;
 395                         break;
 396                 case PAM_MAXTRIES:
 397                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 398                         nt_status = NT_STATUS_REMOTE_SESSION_LIMIT;
 399                         break;
 400                 case PAM_ABORT:
 401                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 402                         nt_status = NT_STATUS_LOGON_FAILURE;
 403                         break;
 404                 case PAM_SUCCESS:
 405                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 406                         nt_status = NT_STATUS_NOPROBLEMO;
 407                         break;
 408                 default:
 409                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 410                         nt_status = NT_STATUS_LOGON_FAILURE;
 411                         break;
 412         }
 413
 414         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 415         return nt_status;
 416 }
 417
 418 /*
 419  * PAM Account Handler
 420  */
 421 static uint32 smb_pam_account(pam_handle_t *pamh, char * user)
 422 {
 423         int pam_error;
 424         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 425
 426         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 427         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 428         switch( pam_error ) {
 429                 case PAM_AUTHTOK_EXPIRED:
 430                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 431                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 432                         break;
 433                 case PAM_ACCT_EXPIRED:
 434                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 435                         nt_status = NT_STATUS_ACCOUNT_EXPIRED;
 436                         break;
 437                 case PAM_AUTH_ERR:
 438                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 439                         nt_status = NT_STATUS_LOGON_FAILURE;
 440                         break;
 441                 case PAM_PERM_DENIED:
 442                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 443                         nt_status = NT_STATUS_ACCOUNT_RESTRICTION;
 444                         break;
 445                 case PAM_USER_UNKNOWN:
 446                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 447                         nt_status = NT_STATUS_NO_SUCH_USER;
 448                         break;
 449                 case PAM_SUCCESS:
 450                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 451                         nt_status = NT_STATUS_NOPROBLEMO;
 452                         break;
 453                 default:
 454                         nt_status = NT_STATUS_ACCOUNT_DISABLED;
 455                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 456                         break;
 457         }
 458
 459         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 460         return nt_status;
 461 }
 462
 463 /*
 464  * PAM Credential Setting
 465  */
 466
 467 static uint32 smb_pam_setcred(pam_handle_t *pamh, char * user)
 468 {
 469         int pam_error;
 470         uint32 nt_status = NT_STATUS_NO_TOKEN;
 471
 472         /*
 473          * This will allow samba to aquire a kerberos token. And, when
 474          * exporting an AFS cell, be able to /write/ to this cell.
 475          */
 476
 477         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 478         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 479         switch( pam_error ) {
 480                 case PAM_CRED_UNAVAIL:
 481                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 482                          nt_status = NT_STATUS_NO_TOKEN;
 483                         break;
 484                 case PAM_CRED_EXPIRED:
 485                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 486                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 487                         break;
 488                 case PAM_USER_UNKNOWN:
 489                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 490                         nt_status = NT_STATUS_NO_SUCH_USER;
 491                         break;
 492                 case PAM_CRED_ERR:
 493                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 494                         nt_status = NT_STATUS_LOGON_FAILURE;
 495                         break;
 496                 case PAM_SUCCESS:
 497                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 498                         nt_status = NT_STATUS_NOPROBLEMO;
 499                         break;
 500                 default:
 501                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 502                         nt_status = NT_STATUS_NO_TOKEN;
 503                         break;
 504         }
 505
 506         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 507         return nt_status;
 508 }
 509
 510 /*
 511  * PAM Internal Session Handler
 512  */
 513 static BOOL smb_internal_pam_session(pam_handle_t *pamh, char *user, char *tty, BOOL flag)
 514 {
 515         int pam_error;
 516
 517 #ifdef PAM_TTY
 518         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 519         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 520         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 521                 return False;
 522 #endif
 523
 524         if (flag) {
 525                 pam_error = pam_open_session(pamh, PAM_SILENT);
 526                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 527                         return False;
 528         } else {
 529                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 530                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 531                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 532                         return False;
 533         }
 534         return (True);
 535 }
 536
 537 /*
 538  * Internal PAM Password Changer.
 539  */
 540
 541 static BOOL smb_pam_chauthtok(pam_handle_t *pamh, char * user)
 542 {
 543         int pam_error;
 544
 545         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 546
 547         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 548
 549         switch( pam_error ) {
 550         case PAM_AUTHTOK_ERR:
 551                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 552                 break;
 553
 554         /* This doesn't seem to be defined on Solaris. JRA */
 555 #ifdef PAM_AUTHTOK_RECOVER_ERR
 556         case PAM_AUTHTOK_RECOVER_ERR:
 557                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 558                 break;
 559 #endif
 560
 561         case PAM_AUTHTOK_LOCK_BUSY:
 562                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 563                 break;
 564         case PAM_AUTHTOK_DISABLE_AGING:
 565                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 566                 break;
 567         case PAM_PERM_DENIED:
 568                 DEBUG(0, ("PAM: Permission denied.\n"));
 569                 break;
 570         case PAM_TRY_AGAIN:
 571                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 572                 break;
 573         case PAM_USER_UNKNOWN:
 574                 DEBUG(0, ("PAM: User not known to PAM\n"));
 575                 break;
 576         case PAM_SUCCESS:
 577                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 578                 break;
 579         default:
 580                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 581         }
 582
 583         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 584                 return False;
 585         }
 586
 587         /* If this point is reached, the password has changed. */
 588         return True;
 589 }
 590
 591 /*
 592  * PAM Externally accessible Session handler
 593  */
 594
 595 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 596 {
 597         pam_handle_t *pamh = NULL;
 598         struct pam_conv *pconv = NULL;
 599
 600         /* Ignore PAM if told to. */
 601
 602         if (!lp_obey_pam_restrictions())
 603                 return True;
 604
 605         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 606                 return False;
 607
 608         if (!smb_pam_start(&pamh, user, rhost, pconv))
 609                 return False;
 610
 611         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 612                 smb_pam_end(pamh, pconv);
 613                 return False;
 614         }
 615
 616         return smb_pam_end(pamh, pconv);
 617 }
 618
 619 /*
 620  * PAM Externally accessible Session handler
 621  */
 622
 623 BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
 624 {
 625         pam_handle_t *pamh = NULL;
 626         struct pam_conv *pconv = NULL;
 627
 628         /* Ignore PAM if told to. */
 629
 630         if (!lp_obey_pam_restrictions())
 631                 return True;
 632
 633         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 634                 return False;
 635
 636         if (!smb_pam_start(&pamh, user, rhost, pconv))
 637                 return False;
 638
 639         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 640                 smb_pam_end(pamh, pconv);
 641                 return False;
 642         }
 643
 644         return smb_pam_end(pamh, pconv);
 645 }
 646
 647 /*
 648  * PAM Externally accessible Account handler
 649  */
 650
 651 uint32 smb_pam_accountcheck(char * user)
 652 {
 653         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 654         pam_handle_t *pamh = NULL;
 655         struct pam_conv *pconv = NULL;
 656
 657         /* Ignore PAM if told to. */
 658
 659         if (!lp_obey_pam_restrictions())
 660                 return NT_STATUS_NOPROBLEMO;
 661
 662         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 663                 return False;
 664
 665         if (!smb_pam_start(&pamh, user, NULL, pconv))
 666                 return NT_STATUS_ACCOUNT_DISABLED;
 667
 668         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO)
 669                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 670
 671         smb_pam_end(pamh, pconv);
 672         return nt_status;
 673 }
 674
 675 /*
 676  * PAM Password Validation Suite
 677  */
 678
 679 uint32 smb_pam_passcheck(char * user, char * password)
 680 {
 681         pam_handle_t *pamh = NULL;
 682         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 683         struct pam_conv *pconv = NULL;
 684
 685         /*
 686          * Note we can't ignore PAM here as this is the only
 687          * way of doing auths on plaintext passwords when
 688          * compiled --with-pam.
 689          */
 690
 691         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 692                 return NT_STATUS_LOGON_FAILURE;
 693
 694         if (!smb_pam_start(&pamh, user, NULL, pconv))
 695                 return NT_STATUS_LOGON_FAILURE;
 696
 697         if ((nt_status = smb_pam_auth(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 698                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 699                 smb_pam_end(pamh, pconv);
 700                 return nt_status;
 701         }
 702
 703         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 704                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 705                 smb_pam_end(pamh, pconv);
 706                 return nt_status;
 707         }
 708
 709         if ((nt_status = smb_pam_setcred(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 710                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 711                 smb_pam_end(pamh, pconv);
 712                 return nt_status;
 713         }
 714
 715         smb_pam_end(pamh, pconv);
 716         return nt_status;
 717 }
 718
 719 /*
 720  * PAM Password Change Suite
 721  */
 722
 723 BOOL smb_pam_passchange(char * user, char * oldpassword, char * newpassword)
 724 {
 725         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 726         struct pam_conv *pconv = NULL;
 727         pam_handle_t *pamh = NULL;
 728
 729         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 730                 return False;
 731
 732         if(!smb_pam_start(&pamh, user, NULL, pconv))
 733                 return False;
 734
 735         if (!smb_pam_chauthtok(pamh, user)) {
 736                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 737                 smb_pam_end(pamh, pconv);
 738                 return False;
 739         }
 740
 741         return smb_pam_end(pamh, pconv);
 742 }
 743
 744 #else
 745
 746 /* If PAM not used, no PAM restrictions on accounts. */
 747  uint32 smb_pam_accountcheck(char * user)
 748 {
 749         return NT_STATUS_NOPROBLEMO;
 750 }
 751
 752 /* If PAM not used, also no PAM restrictions on sessions. */
 753  BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 754 {
 755         return True;
 756 }
 757
 758 /* If PAM not used, also no PAM restrictions on sessions. */
 759  BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
 760 {
 761         return True;
 762 }
 763 #endif /* WITH_PAM */