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 "auth.h"
  31 #include "../libcli/auth/pam_errors.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_AUTH
  35
  36 #ifdef WITH_PAM
  37
  38 /*******************************************************************
  39  * Handle PAM authentication
  40  *      - Access, Authentication, Session, Password
  41  *   Note: See PAM Documentation and refer to local system PAM implementation
  42  *   which determines what actions/limitations/allowances become affected.
  43  *********************************************************************/
  44
  45 #if defined(HAVE_SECURITY_PAM_APPL_H)
  46 #include <security/pam_appl.h>
  47 #elif defined(HAVE_PAM_PAM_APPL_H)
  48 #include <pam/pam_appl.h>
  49 #endif
  50
  51 /*
  52  * Structure used to communicate between the conversation function
  53  * and the server_login/change password functions.
  54  */
  55
  56 struct smb_pam_userdata {
  57         const char *PAM_username;
  58         const char *PAM_password;
  59         const char *PAM_newpassword;
  60 };
  61
  62 typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
  63
  64 static char *smb_pam_copy_string(const char *s)
  65 {
  66         if (s == NULL) {
  67                 return NULL;
  68         }
  69         return SMB_STRDUP(s);
  70 }
  71
  72 static char *smb_pam_copy_fstring(const char *s)
  73 {
  74         if (s[0] == '\0') {
  75                 return NULL;
  76         }
  77         return SMB_STRDUP(s);
  78 }
  79
  80 /*******************************************************************
  81  PAM error handler.
  82  *********************************************************************/
  83
  84 static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
  85 {
  86
  87         if( pam_error != PAM_SUCCESS) {
  88                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  89                                 msg, pam_strerror(pamh, pam_error)));
  90                 return False;
  91         }
  92         return True;
  93 }
  94
  95 /*******************************************************************
  96  This function is a sanity check, to make sure that we NEVER report
  97  failure as sucess.
  98 *********************************************************************/
  99
 100 static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
 101                                             const char *msg, int dbglvl,
 102                                             NTSTATUS *nt_status)
 103 {
 104         *nt_status = pam_to_nt_status(pam_error);
 105
 106         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
 107                 return True;
 108
 109         if (NT_STATUS_IS_OK(*nt_status)) {
 110                 /* Complain LOUDLY */
 111                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
 112 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
 113                 *nt_status = NT_STATUS_LOGON_FAILURE;
 114         }
 115         return False;
 116 }
 117
 118 /*
 119  * PAM conversation function
 120  * Here we assume (for now, at least) that echo on means login name, and
 121  * echo off means password.
 122  */
 123
 124 static int smb_pam_conv(int num_msg,
 125                     const struct pam_message **msg,
 126                     struct pam_response **resp,
 127                     void *appdata_ptr)
 128 {
 129         int replies = 0;
 130         struct pam_response *reply = NULL;
 131         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 132
 133         *resp = NULL;
 134
 135         if (num_msg <= 0)
 136                 return PAM_CONV_ERR;
 137
 138         /*
 139          * Apparantly HPUX has a buggy PAM that doesn't support the
 140          * appdata_ptr. Fail if this is the case. JRA.
 141          */
 142
 143         if (udp == NULL) {
 144                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 145                 return PAM_CONV_ERR;
 146         }
 147
 148         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 149         if (!reply)
 150                 return PAM_CONV_ERR;
 151
 152         memset(reply, '\0', sizeof(struct pam_response) * num_msg);
 153
 154         for (replies = 0; replies < num_msg; replies++) {
 155                 switch (msg[replies]->msg_style) {
 156                         case PAM_PROMPT_ECHO_ON:
 157                                 reply[replies].resp_retcode = PAM_SUCCESS;
 158                                 reply[replies].resp = smb_pam_copy_string(
 159                                         udp->PAM_username);
 160                                 /* PAM frees resp */
 161                                 break;
 162
 163                         case PAM_PROMPT_ECHO_OFF:
 164                                 reply[replies].resp_retcode = PAM_SUCCESS;
 165                                 reply[replies].resp = smb_pam_copy_string(
 166                                         udp->PAM_password);
 167                                 /* PAM frees resp */
 168                                 break;
 169
 170                         case PAM_TEXT_INFO:
 171                                 FALL_THROUGH;
 172
 173                         case PAM_ERROR_MSG:
 174                                 /* ignore it... */
 175                                 reply[replies].resp_retcode = PAM_SUCCESS;
 176                                 reply[replies].resp = NULL;
 177                                 break;
 178
 179                         default:
 180                                 /* Must be an error of some sort... */
 181                                 SAFE_FREE(reply);
 182                                 return PAM_CONV_ERR;
 183                 }
 184         }
 185         if (reply)
 186                 *resp = reply;
 187         return PAM_SUCCESS;
 188 }
 189
 190 /*
 191  * PAM password change conversation function
 192  * Here we assume (for now, at least) that echo on means login name, and
 193  * echo off means password.
 194  */
 195
 196 static void special_char_sub(char *buf)
 197 {
 198         all_string_sub(buf, "\\n", "", 0);
 199         all_string_sub(buf, "\\r", "", 0);
 200         all_string_sub(buf, "\\s", " ", 0);
 201         all_string_sub(buf, "\\t", "\t", 0);
 202 }
 203
 204 static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
 205 {
 206         fstring_sub(buf, "%u", username);
 207         all_string_sub(buf, "%o", oldpass, sizeof(fstring));
 208         all_string_sub(buf, "%n", newpass, sizeof(fstring));
 209 }
 210
 211
 212 struct chat_struct {
 213         struct chat_struct *next, *prev;
 214         fstring prompt;
 215         fstring reply;
 216 };
 217
 218 /**************************************************************
 219  Create a linked list containing chat data.
 220 ***************************************************************/
 221
 222 static struct chat_struct *make_pw_chat(const char *p)
 223 {
 224         char *prompt;
 225         char *reply;
 226         struct chat_struct *list = NULL;
 227         struct chat_struct *t;
 228         TALLOC_CTX *frame = talloc_stackframe();
 229
 230         while (1) {
 231                 t = SMB_MALLOC_P(struct chat_struct);
 232                 if (!t) {
 233                         DEBUG(0,("make_pw_chat: malloc failed!\n"));
 234                         TALLOC_FREE(frame);
 235                         return NULL;
 236                 }
 237
 238                 ZERO_STRUCTP(t);
 239
 240                 DLIST_ADD_END(list, t);
 241
 242                 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
 243                         break;
 244                 }
 245
 246                 if (strequal(prompt,".")) {
 247                         fstrcpy(prompt,"*");
 248                 }
 249
 250                 special_char_sub(prompt);
 251                 fstrcpy(t->prompt, prompt);
 252                 (void)strlower_m(t->prompt);
 253                 trim_char(t->prompt, ' ', ' ');
 254
 255                 if (!next_token_talloc(frame, &p, &reply, NULL)) {
 256                         break;
 257                 }
 258
 259                 if (strequal(reply,".")) {
 260                         fstrcpy(reply,"");
 261                 }
 262
 263                 special_char_sub(reply);
 264                 fstrcpy(t->reply, reply);
 265                 (void)strlower_m(t->reply);
 266                 trim_char(t->reply, ' ', ' ');
 267
 268         }
 269         TALLOC_FREE(frame);
 270         return list;
 271 }
 272
 273 static void free_pw_chat(struct chat_struct *list)
 274 {
 275     while (list) {
 276         struct chat_struct *old_head = list;
 277         DLIST_REMOVE(list, list);
 278         SAFE_FREE(old_head);
 279     }
 280 }
 281
 282 static int smb_pam_passchange_conv(int num_msg,
 283                                 const struct pam_message **msg,
 284                                 struct pam_response **resp,
 285                                 void *appdata_ptr)
 286 {
 287         int replies = 0;
 288         struct pam_response *reply = NULL;
 289         fstring current_prompt;
 290         fstring current_reply;
 291         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 292         struct chat_struct *pw_chat;
 293         struct chat_struct *t;
 294         const struct loadparm_substitution *lp_sub =
 295                 loadparm_s3_global_substitution();
 296         bool found;
 297         *resp = NULL;
 298
 299         DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
 300
 301         if (num_msg <= 0)
 302                 return PAM_CONV_ERR;
 303
 304         if ((pw_chat = make_pw_chat(lp_passwd_chat(talloc_tos(), lp_sub))) == NULL)
 305                 return PAM_CONV_ERR;
 306
 307         /*
 308          * Apparantly HPUX has a buggy PAM that doesn't support the
 309          * appdata_ptr. Fail if this is the case. JRA.
 310          */
 311
 312         if (udp == NULL) {
 313                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 314                 free_pw_chat(pw_chat);
 315                 return PAM_CONV_ERR;
 316         }
 317
 318         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 319         if (!reply) {
 320                 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
 321                 free_pw_chat(pw_chat);
 322                 return PAM_CONV_ERR;
 323         }
 324
 325         for (replies = 0; replies < num_msg; replies++) {
 326                 found = False;
 327                 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
 328                 switch (msg[replies]->msg_style) {
 329                 case PAM_PROMPT_ECHO_ON:
 330                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 331                         fstrcpy(current_prompt, msg[replies]->msg);
 332                         trim_char(current_prompt, ' ', ' ');
 333                         for (t=pw_chat; t; t=t->next) {
 334
 335                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
 336                                                 t->prompt, current_prompt ));
 337
 338                                 if (unix_wild_match(t->prompt, current_prompt)) {
 339                                         fstrcpy(current_reply, t->reply);
 340                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
 341                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 342 #ifdef DEBUG_PASSWORD
 343                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actually sent: %s\n", current_reply));
 344 #endif
 345                                         reply[replies].resp_retcode = PAM_SUCCESS;
 346                                         reply[replies].resp = smb_pam_copy_fstring(
 347                                                 current_reply);
 348                                         found = True;
 349                                         break;
 350                                 }
 351                         }
 352                         /* PAM frees resp */
 353                         if (!found) {
 354                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 355                                 free_pw_chat(pw_chat);
 356                                 SAFE_FREE(reply);
 357                                 return PAM_CONV_ERR;
 358                         }
 359                         break;
 360
 361                 case PAM_PROMPT_ECHO_OFF:
 362                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 363                         fstrcpy(current_prompt, msg[replies]->msg);
 364                         trim_char(current_prompt, ' ', ' ');
 365                         for (t=pw_chat; t; t=t->next) {
 366
 367                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
 368                                                 t->prompt, current_prompt ));
 369
 370                                 if (unix_wild_match(t->prompt, current_prompt)) {
 371                                         fstrcpy(current_reply, t->reply);
 372                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
 373                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 374                                         reply[replies].resp_retcode = PAM_SUCCESS;
 375                                         reply[replies].resp = smb_pam_copy_fstring(
 376                                                 current_reply);
 377 #ifdef DEBUG_PASSWORD
 378                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actually sent: %s\n", current_reply));
 379 #endif
 380                                         found = True;
 381                                         break;
 382                                 }
 383                         }
 384                         /* PAM frees resp */
 385
 386                         if (!found) {
 387                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 388                                 free_pw_chat(pw_chat);
 389                                 SAFE_FREE(reply);
 390                                 return PAM_CONV_ERR;
 391                         }
 392                         break;
 393
 394                 case PAM_TEXT_INFO:
 395                         FALL_THROUGH;
 396
 397                 case PAM_ERROR_MSG:
 398                         /* ignore it... */
 399                         reply[replies].resp_retcode = PAM_SUCCESS;
 400                         reply[replies].resp = NULL;
 401                         break;
 402
 403                 default:
 404                         /* Must be an error of some sort... */
 405                         free_pw_chat(pw_chat);
 406                         SAFE_FREE(reply);
 407                         return PAM_CONV_ERR;
 408                 }
 409         }
 410
 411         free_pw_chat(pw_chat);
 412         if (reply)
 413                 *resp = reply;
 414         return PAM_SUCCESS;
 415 }
 416
 417 /***************************************************************************
 418  Free up a malloced pam_conv struct.
 419 ****************************************************************************/
 420
 421 static void smb_free_pam_conv(struct pam_conv *pconv)
 422 {
 423         if (pconv)
 424                 SAFE_FREE(pconv->appdata_ptr);
 425
 426         SAFE_FREE(pconv);
 427 }
 428
 429 /***************************************************************************
 430  Allocate a pam_conv struct.
 431 ****************************************************************************/
 432
 433 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
 434                                         const char *passwd, const char *newpass)
 435 {
 436         struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
 437         struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
 438
 439         if (pconv == NULL || udp == NULL) {
 440                 SAFE_FREE(pconv);
 441                 SAFE_FREE(udp);
 442                 return NULL;
 443         }
 444
 445         udp->PAM_username = user;
 446         udp->PAM_password = passwd;
 447         udp->PAM_newpassword = newpass;
 448
 449         pconv->conv = smb_pam_conv_fnptr;
 450         pconv->appdata_ptr = (void *)udp;
 451         return pconv;
 452 }
 453
 454 /*
 455  * PAM Closing out cleanup handler
 456  */
 457
 458 static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 459 {
 460         int pam_error;
 461
 462         smb_free_pam_conv(smb_pam_conv_ptr);
 463
 464         if( pamh != NULL ) {
 465                 pam_error = pam_end(pamh, 0);
 466                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 467                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 468                         return True;
 469                 }
 470         }
 471         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 472         return False;
 473 }
 474
 475 /*
 476  * Start PAM authentication for specified account
 477  */
 478
 479 static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
 480 {
 481         int pam_error;
 482
 483         *pamh = (pam_handle_t *)NULL;
 484
 485         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 486
 487         pam_error = pam_start("samba", user, pconv, pamh);
 488         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 489                 *pamh = (pam_handle_t *)NULL;
 490                 return False;
 491         }
 492
 493 #ifdef HAVE_PAM_RHOST
 494         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 495         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 496         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 497                 smb_pam_end(*pamh, pconv);
 498                 *pamh = (pam_handle_t *)NULL;
 499                 return False;
 500         }
 501 #endif
 502 #ifdef HAVE_PAM_TTY
 503         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 504         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 505         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 506                 smb_pam_end(*pamh, pconv);
 507                 *pamh = (pam_handle_t *)NULL;
 508                 return False;
 509         }
 510 #endif
 511         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 512         return True;
 513 }
 514
 515 /*
 516  * PAM Authentication Handler
 517  */
 518 static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
 519 {
 520         int pam_error;
 521         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 522
 523         /*
 524          * To enable debugging set in /etc/pam.d/samba:
 525          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 526          */
 527
 528         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 529         pam_error = pam_authenticate(pamh, PAM_SILENT | (lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK));
 530         switch( pam_error ){
 531                 case PAM_AUTH_ERR:
 532                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
 533                         break;
 534                 case PAM_CRED_INSUFFICIENT:
 535                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 536                         break;
 537                 case PAM_AUTHINFO_UNAVAIL:
 538                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 539                         break;
 540                 case PAM_USER_UNKNOWN:
 541                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 542                         break;
 543                 case PAM_MAXTRIES:
 544                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 545                         break;
 546                 case PAM_ABORT:
 547                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 548                         break;
 549                 case PAM_SUCCESS:
 550                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 551                         break;
 552                 default:
 553                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 554                         break;
 555         }
 556
 557         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 558         return nt_status;
 559 }
 560
 561 /*
 562  * PAM Account Handler
 563  */
 564 static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
 565 {
 566         int pam_error;
 567         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 568
 569         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 570         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 571         switch( pam_error ) {
 572                 case PAM_AUTHTOK_EXPIRED:
 573                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 574                         break;
 575                 case PAM_ACCT_EXPIRED:
 576                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 577                         break;
 578                 case PAM_AUTH_ERR:
 579                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 580                         break;
 581                 case PAM_PERM_DENIED:
 582                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 583                         break;
 584                 case PAM_USER_UNKNOWN:
 585                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 586                         break;
 587                 case PAM_SUCCESS:
 588                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 589                         break;
 590                 default:
 591                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 592                         break;
 593         }
 594
 595         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 596         return nt_status;
 597 }
 598
 599 /*
 600  * PAM Credential Setting
 601  */
 602
 603 static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
 604 {
 605         int pam_error;
 606         NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
 607
 608         /*
 609          * This will allow samba to aquire a kerberos token. And, when
 610          * exporting an AFS cell, be able to /write/ to this cell.
 611          */
 612
 613         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 614         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 615         switch( pam_error ) {
 616                 case PAM_CRED_UNAVAIL:
 617                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 618                         break;
 619                 case PAM_CRED_EXPIRED:
 620                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 621                         break;
 622                 case PAM_USER_UNKNOWN:
 623                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 624                         break;
 625                 case PAM_CRED_ERR:
 626                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 627                         break;
 628                 case PAM_SUCCESS:
 629                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 630                         break;
 631                 default:
 632                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 633                         break;
 634         }
 635
 636         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 637         return nt_status;
 638 }
 639
 640 /*
 641  * PAM Internal Session Handler
 642  */
 643 static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
 644 {
 645         int pam_error;
 646
 647 #ifdef HAVE_PAM_TTY
 648         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 649         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 650         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 651                 return False;
 652 #endif
 653
 654         if (flag) {
 655                 pam_error = pam_open_session(pamh, PAM_SILENT);
 656                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 657                         return False;
 658         } else {
 659                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 660                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 661                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 662                         return False;
 663         }
 664         return (True);
 665 }
 666
 667 /*
 668  * Internal PAM Password Changer.
 669  */
 670
 671 static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
 672 {
 673         int pam_error;
 674
 675         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 676
 677         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 678
 679         switch( pam_error ) {
 680         case PAM_AUTHTOK_ERR:
 681                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 682                 break;
 683
 684         /* This doesn't seem to be defined on Solaris. JRA */
 685 #ifdef PAM_AUTHTOK_RECOVER_ERR
 686         case PAM_AUTHTOK_RECOVER_ERR:
 687                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 688                 break;
 689 #endif
 690
 691         case PAM_AUTHTOK_LOCK_BUSY:
 692                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 693                 break;
 694         case PAM_AUTHTOK_DISABLE_AGING:
 695                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 696                 break;
 697         case PAM_PERM_DENIED:
 698                 DEBUG(0, ("PAM: Permission denied.\n"));
 699                 break;
 700         case PAM_TRY_AGAIN:
 701                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 702                 break;
 703         case PAM_USER_UNKNOWN:
 704                 DEBUG(0, ("PAM: User not known to PAM\n"));
 705                 break;
 706         case PAM_SUCCESS:
 707                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 708                 break;
 709         default:
 710                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 711         }
 712
 713         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 714                 return False;
 715         }
 716
 717         /* If this point is reached, the password has changed. */
 718         return True;
 719 }
 720
 721 /*
 722  * PAM Externally accessible Session handler
 723  */
 724
 725 bool smb_pam_claim_session(const char *user, const char *tty, const char *rhost)
 726 {
 727         pam_handle_t *pamh = NULL;
 728         struct pam_conv *pconv = NULL;
 729
 730         /* Ignore PAM if told to. */
 731
 732         if (!lp_obey_pam_restrictions())
 733                 return True;
 734
 735         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 736                 return False;
 737
 738         if (!smb_pam_start(&pamh, user, rhost, pconv))
 739                 return False;
 740
 741         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 742                 smb_pam_end(pamh, pconv);
 743                 return False;
 744         }
 745
 746         return smb_pam_end(pamh, pconv);
 747 }
 748
 749 /*
 750  * PAM Externally accessible Session handler
 751  */
 752
 753 bool smb_pam_close_session(const char *user, const char *tty, const char *rhost)
 754 {
 755         pam_handle_t *pamh = NULL;
 756         struct pam_conv *pconv = NULL;
 757
 758         /* Ignore PAM if told to. */
 759
 760         if (!lp_obey_pam_restrictions())
 761                 return True;
 762
 763         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 764                 return False;
 765
 766         if (!smb_pam_start(&pamh, user, rhost, pconv))
 767                 return False;
 768
 769         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 770                 smb_pam_end(pamh, pconv);
 771                 return False;
 772         }
 773
 774         return smb_pam_end(pamh, pconv);
 775 }
 776
 777 /*
 778  * PAM Externally accessible Account handler
 779  */
 780
 781 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 782 {
 783         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 784         pam_handle_t *pamh = NULL;
 785         struct pam_conv *pconv = NULL;
 786
 787         /* Ignore PAM if told to. */
 788
 789         if (!lp_obey_pam_restrictions())
 790                 return NT_STATUS_OK;
 791
 792         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 793                 return NT_STATUS_NO_MEMORY;
 794
 795         if (!smb_pam_start(&pamh, user, rhost, pconv))
 796                 return NT_STATUS_ACCOUNT_DISABLED;
 797
 798         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
 799                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 800
 801         smb_pam_end(pamh, pconv);
 802         return nt_status;
 803 }
 804
 805 /*
 806  * PAM Password Validation Suite
 807  */
 808
 809 NTSTATUS smb_pam_passcheck(const char * user, const char * rhost,
 810                            const char * password)
 811 {
 812         pam_handle_t *pamh = NULL;
 813         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 814         struct pam_conv *pconv = NULL;
 815
 816         /*
 817          * Note we can't ignore PAM here as this is the only
 818          * way of doing auths on plaintext passwords when
 819          * compiled --with-pam.
 820          */
 821
 822         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 823                 return NT_STATUS_LOGON_FAILURE;
 824
 825         if (!smb_pam_start(&pamh, user, rhost, pconv))
 826                 return NT_STATUS_LOGON_FAILURE;
 827
 828         if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
 829                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 830                 smb_pam_end(pamh, pconv);
 831                 return nt_status;
 832         }
 833
 834         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
 835                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 836                 smb_pam_end(pamh, pconv);
 837                 return nt_status;
 838         }
 839
 840         if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
 841                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 842                 smb_pam_end(pamh, pconv);
 843                 return nt_status;
 844         }
 845
 846         smb_pam_end(pamh, pconv);
 847         return nt_status;
 848 }
 849
 850 /*
 851  * PAM Password Change Suite
 852  */
 853
 854 bool smb_pam_passchange(const char *user, const char *rhost,
 855                         const char *oldpassword, const char *newpassword)
 856 {
 857         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 858         struct pam_conv *pconv = NULL;
 859         pam_handle_t *pamh = NULL;
 860
 861         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 862                 return False;
 863
 864         if(!smb_pam_start(&pamh, user, rhost, pconv))
 865                 return False;
 866
 867         if (!smb_pam_chauthtok(pamh, user)) {
 868                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 869                 smb_pam_end(pamh, pconv);
 870                 return False;
 871         }
 872
 873         return smb_pam_end(pamh, pconv);
 874 }
 875
 876 #else
 877
 878 /* If PAM not used, no PAM restrictions on accounts. */
 879 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 880 {
 881         return NT_STATUS_OK;
 882 }
 883
 884 /* If PAM not used, also no PAM restrictions on sessions. */
 885 bool smb_pam_claim_session(const char *user, const char *tty, const char *rhost)
 886 {
 887         return True;
 888 }
 889
 890 /* If PAM not used, also no PAM restrictions on sessions. */
 891 bool smb_pam_close_session(const char *in_user, const char *tty, const char *rhost)
 892 {
 893         return True;
 894 }
 895 #endif /* WITH_PAM */