source/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25  * This module provides PAM based functions for validation of
  26  * username/password pairs, account managment, session and access control.
  27  * Note: SMB password checking is done in smbpass.c
  28  */
  29
  30 #include "includes.h"
  31
  32 #undef DBGC_CLASS
  33 #define DBGC_CLASS DBGC_AUTH
  34
  35 #ifdef WITH_PAM
  36
  37 /*******************************************************************
  38  * Handle PAM authentication
  39  *      - Access, Authentication, Session, Password
  40  *   Note: See PAM Documentation and refer to local system PAM implementation
  41  *   which determines what actions/limitations/allowances become affected.
  42  *********************************************************************/
  43
  44 #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         const char *PAM_username;
  53         const char *PAM_password;
  54         const 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) ? SMB_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, const 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
  75                 return False;
  76         }
  77         return True;
  78 }
  79
  80 /*******************************************************************
  81  This function is a sanity check, to make sure that we NEVER report
  82  failure as sucess.
  83 *********************************************************************/
  84
  85 static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
  86                                             const char *msg, int dbglvl,
  87                                             NTSTATUS *nt_status)
  88 {
  89         *nt_status = pam_to_nt_status(pam_error);
  90
  91         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
  92                 return True;
  93
  94         if (NT_STATUS_IS_OK(*nt_status)) {
  95                 /* Complain LOUDLY */
  96                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
  97 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
  98                 *nt_status = NT_STATUS_LOGON_FAILURE;
  99         }
 100         return False;
 101 }
 102
 103 /*
 104  * PAM conversation function
 105  * Here we assume (for now, at least) that echo on means login name, and
 106  * echo off means password.
 107  */
 108
 109 static int smb_pam_conv(int num_msg,
 110                     const struct pam_message **msg,
 111                     struct pam_response **resp,
 112                     void *appdata_ptr)
 113 {
 114         int replies = 0;
 115         struct pam_response *reply = NULL;
 116         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 117
 118         *resp = NULL;
 119
 120         if (num_msg <= 0)
 121                 return PAM_CONV_ERR;
 122
 123         /*
 124          * Apparantly HPUX has a buggy PAM that doesn't support the
 125          * appdata_ptr. Fail if this is the case. JRA.
 126          */
 127
 128         if (udp == NULL) {
 129                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 130                 return PAM_CONV_ERR;
 131         }
 132
 133         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 134         if (!reply)
 135                 return PAM_CONV_ERR;
 136
 137         memset(reply, '\0', sizeof(struct pam_response) * num_msg);
 138
 139         for (replies = 0; replies < num_msg; replies++) {
 140                 switch (msg[replies]->msg_style) {
 141                         case PAM_PROMPT_ECHO_ON:
 142                                 reply[replies].resp_retcode = PAM_SUCCESS;
 143                                 reply[replies].resp = COPY_STRING(udp->PAM_username);
 144                                 /* PAM frees resp */
 145                                 break;
 146
 147                         case PAM_PROMPT_ECHO_OFF:
 148                                 reply[replies].resp_retcode = PAM_SUCCESS;
 149                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 150                                 /* PAM frees resp */
 151                                 break;
 152
 153                         case PAM_TEXT_INFO:
 154                                 /* fall through */
 155
 156                         case PAM_ERROR_MSG:
 157                                 /* ignore it... */
 158                                 reply[replies].resp_retcode = PAM_SUCCESS;
 159                                 reply[replies].resp = NULL;
 160                                 break;
 161
 162                         default:
 163                                 /* Must be an error of some sort... */
 164                                 SAFE_FREE(reply);
 165                                 return PAM_CONV_ERR;
 166                 }
 167         }
 168         if (reply)
 169                 *resp = reply;
 170         return PAM_SUCCESS;
 171 }
 172
 173 /*
 174  * PAM password change conversation function
 175  * Here we assume (for now, at least) that echo on means login name, and
 176  * echo off means password.
 177  */
 178
 179 static void special_char_sub(char *buf)
 180 {
 181         all_string_sub(buf, "\\n", "", 0);
 182         all_string_sub(buf, "\\r", "", 0);
 183         all_string_sub(buf, "\\s", " ", 0);
 184         all_string_sub(buf, "\\t", "\t", 0);
 185 }
 186
 187 static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
 188 {
 189         fstring_sub(buf, "%u", username);
 190         all_string_sub(buf, "%o", oldpass, sizeof(fstring));
 191         all_string_sub(buf, "%n", newpass, sizeof(fstring));
 192 }
 193
 194
 195 struct chat_struct {
 196         struct chat_struct *next, *prev;
 197         fstring prompt;
 198         fstring reply;
 199 };
 200
 201 /**************************************************************
 202  Create a linked list containing chat data.
 203 ***************************************************************/
 204
 205 static struct chat_struct *make_pw_chat(const char *p)
 206 {
 207         fstring prompt;
 208         fstring reply;
 209         struct chat_struct *list = NULL;
 210         struct chat_struct *t;
 211
 212         while (1) {
 213                 t = SMB_MALLOC_P(struct chat_struct);
 214                 if (!t) {
 215                         DEBUG(0,("make_pw_chat: malloc failed!\n"));
 216                         return NULL;
 217                 }
 218
 219                 ZERO_STRUCTP(t);
 220
 221                 DLIST_ADD_END(list, t, struct chat_struct*);
 222
 223                 if (!next_token(&p, prompt, NULL, sizeof(fstring)))
 224                         break;
 225
 226                 if (strequal(prompt,"."))
 227                         fstrcpy(prompt,"*");
 228
 229                 special_char_sub(prompt);
 230                 fstrcpy(t->prompt, prompt);
 231                 strlower_m(t->prompt);
 232                 trim_char(t->prompt, ' ', ' ');
 233
 234                 if (!next_token(&p, reply, NULL, sizeof(fstring)))
 235                         break;
 236
 237                 if (strequal(reply,"."))
 238                                 fstrcpy(reply,"");
 239
 240                 special_char_sub(reply);
 241                 fstrcpy(t->reply, reply);
 242                 strlower_m(t->reply);
 243                 trim_char(t->reply, ' ', ' ');
 244
 245         }
 246         return list;
 247 }
 248
 249 static void free_pw_chat(struct chat_struct *list)
 250 {
 251     while (list) {
 252         struct chat_struct *old_head = list;
 253         DLIST_REMOVE(list, list);
 254         SAFE_FREE(old_head);
 255     }
 256 }
 257
 258 static int smb_pam_passchange_conv(int num_msg,
 259                                 const struct pam_message **msg,
 260                                 struct pam_response **resp,
 261                                 void *appdata_ptr)
 262 {
 263         int replies = 0;
 264         struct pam_response *reply = NULL;
 265         fstring current_prompt;
 266         fstring current_reply;
 267         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 268         struct chat_struct *pw_chat= make_pw_chat(lp_passwd_chat());
 269         struct chat_struct *t;
 270         BOOL found;
 271         *resp = NULL;
 272
 273         DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
 274
 275         if (num_msg <= 0)
 276                 return PAM_CONV_ERR;
 277
 278         if (pw_chat == NULL)
 279                 return PAM_CONV_ERR;
 280
 281         /*
 282          * Apparantly HPUX has a buggy PAM that doesn't support the
 283          * appdata_ptr. Fail if this is the case. JRA.
 284          */
 285
 286         if (udp == NULL) {
 287                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 288                 free_pw_chat(pw_chat);
 289                 return PAM_CONV_ERR;
 290         }
 291
 292         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 293         if (!reply) {
 294                 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
 295                 free_pw_chat(pw_chat);
 296                 return PAM_CONV_ERR;
 297         }
 298
 299         for (replies = 0; replies < num_msg; replies++) {
 300                 found = False;
 301                 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
 302                 switch (msg[replies]->msg_style) {
 303                 case PAM_PROMPT_ECHO_ON:
 304                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 305                         fstrcpy(current_prompt, msg[replies]->msg);
 306                         trim_char(current_prompt, ' ', ' ');
 307                         for (t=pw_chat; t; t=t->next) {
 308
 309                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
 310                                                 t->prompt, current_prompt ));
 311
 312                                 if (unix_wild_match(t->prompt, current_prompt)) {
 313                                         fstrcpy(current_reply, t->reply);
 314                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
 315                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 316 #ifdef DEBUG_PASSWORD
 317                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
 318 #endif
 319                                         reply[replies].resp_retcode = PAM_SUCCESS;
 320                                         reply[replies].resp = COPY_STRING(current_reply);
 321                                         found = True;
 322                                         break;
 323                                 }
 324                         }
 325                         /* PAM frees resp */
 326                         if (!found) {
 327                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 328                                 free_pw_chat(pw_chat);
 329                                 SAFE_FREE(reply);
 330                                 return PAM_CONV_ERR;
 331                         }
 332                         break;
 333
 334                 case PAM_PROMPT_ECHO_OFF:
 335                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 336                         fstrcpy(current_prompt, msg[replies]->msg);
 337                         trim_char(current_prompt, ' ', ' ');
 338                         for (t=pw_chat; t; t=t->next) {
 339
 340                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
 341                                                 t->prompt, current_prompt ));
 342
 343                                 if (unix_wild_match(t->prompt, current_prompt)) {
 344                                         fstrcpy(current_reply, t->reply);
 345                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
 346                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 347                                         reply[replies].resp_retcode = PAM_SUCCESS;
 348                                         reply[replies].resp = COPY_STRING(current_reply);
 349 #ifdef DEBUG_PASSWORD
 350                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
 351 #endif
 352                                         found = True;
 353                                         break;
 354                                 }
 355                         }
 356                         /* PAM frees resp */
 357
 358                         if (!found) {
 359                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 360                                 free_pw_chat(pw_chat);
 361                                 SAFE_FREE(reply);
 362                                 return PAM_CONV_ERR;
 363                         }
 364                         break;
 365
 366                 case PAM_TEXT_INFO:
 367                         /* fall through */
 368
 369                 case PAM_ERROR_MSG:
 370                         /* ignore it... */
 371                         reply[replies].resp_retcode = PAM_SUCCESS;
 372                         reply[replies].resp = NULL;
 373                         break;
 374
 375                 default:
 376                         /* Must be an error of some sort... */
 377                         free_pw_chat(pw_chat);
 378                         SAFE_FREE(reply);
 379                         return PAM_CONV_ERR;
 380                 }
 381         }
 382
 383         free_pw_chat(pw_chat);
 384         if (reply)
 385                 *resp = reply;
 386         return PAM_SUCCESS;
 387 }
 388
 389 /***************************************************************************
 390  Free up a malloced pam_conv struct.
 391 ****************************************************************************/
 392
 393 static void smb_free_pam_conv(struct pam_conv *pconv)
 394 {
 395         if (pconv)
 396                 SAFE_FREE(pconv->appdata_ptr);
 397
 398         SAFE_FREE(pconv);
 399 }
 400
 401 /***************************************************************************
 402  Allocate a pam_conv struct.
 403 ****************************************************************************/
 404
 405 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
 406                                         const char *passwd, const char *newpass)
 407 {
 408         struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
 409         struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
 410
 411         if (pconv == NULL || udp == NULL) {
 412                 SAFE_FREE(pconv);
 413                 SAFE_FREE(udp);
 414                 return NULL;
 415         }
 416
 417         udp->PAM_username = user;
 418         udp->PAM_password = passwd;
 419         udp->PAM_newpassword = newpass;
 420
 421         pconv->conv = smb_pam_conv_fnptr;
 422         pconv->appdata_ptr = (void *)udp;
 423         return pconv;
 424 }
 425
 426 /*
 427  * PAM Closing out cleanup handler
 428  */
 429
 430 static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 431 {
 432         int pam_error;
 433
 434         smb_free_pam_conv(smb_pam_conv_ptr);
 435
 436         if( pamh != NULL ) {
 437                 pam_error = pam_end(pamh, 0);
 438                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 439                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 440                         return True;
 441                 }
 442         }
 443         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 444         return False;
 445 }
 446
 447 /*
 448  * Start PAM authentication for specified account
 449  */
 450
 451 static BOOL smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
 452 {
 453         int pam_error;
 454         const char *our_rhost;
 455
 456         *pamh = (pam_handle_t *)NULL;
 457
 458         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 459
 460         pam_error = pam_start("samba", user, pconv, pamh);
 461         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 462                 *pamh = (pam_handle_t *)NULL;
 463                 return False;
 464         }
 465
 466         if (rhost == NULL) {
 467                 our_rhost = client_name();
 468                 if (strequal(our_rhost,"UNKNOWN"))
 469                         our_rhost = client_addr();
 470         } else {
 471                 our_rhost = rhost;
 472         }
 473
 474 #ifdef PAM_RHOST
 475         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
 476         pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
 477         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 478                 smb_pam_end(*pamh, pconv);
 479                 *pamh = (pam_handle_t *)NULL;
 480                 return False;
 481         }
 482 #endif
 483 #ifdef PAM_TTY
 484         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 485         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 486         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 487                 smb_pam_end(*pamh, pconv);
 488                 *pamh = (pam_handle_t *)NULL;
 489                 return False;
 490         }
 491 #endif
 492         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 493         return True;
 494 }
 495
 496 /*
 497  * PAM Authentication Handler
 498  */
 499 static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
 500 {
 501         int pam_error;
 502         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 503
 504         /*
 505          * To enable debugging set in /etc/pam.d/samba:
 506          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 507          */
 508
 509         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 510         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 511         switch( pam_error ){
 512                 case PAM_AUTH_ERR:
 513                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
 514                         break;
 515                 case PAM_CRED_INSUFFICIENT:
 516                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 517                         break;
 518                 case PAM_AUTHINFO_UNAVAIL:
 519                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 520                         break;
 521                 case PAM_USER_UNKNOWN:
 522                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 523                         break;
 524                 case PAM_MAXTRIES:
 525                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 526                         break;
 527                 case PAM_ABORT:
 528                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 529                         break;
 530                 case PAM_SUCCESS:
 531                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 532                         break;
 533                 default:
 534                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 535                         break;
 536         }
 537
 538         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 539         return nt_status;
 540 }
 541
 542 /*
 543  * PAM Account Handler
 544  */
 545 static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
 546 {
 547         int pam_error;
 548         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 549
 550         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 551         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 552         switch( pam_error ) {
 553                 case PAM_AUTHTOK_EXPIRED:
 554                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 555                         break;
 556                 case PAM_ACCT_EXPIRED:
 557                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 558                         break;
 559                 case PAM_AUTH_ERR:
 560                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 561                         break;
 562                 case PAM_PERM_DENIED:
 563                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 564                         break;
 565                 case PAM_USER_UNKNOWN:
 566                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 567                         break;
 568                 case PAM_SUCCESS:
 569                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 570                         break;
 571                 default:
 572                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 573                         break;
 574         }
 575
 576         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 577         return nt_status;
 578 }
 579
 580 /*
 581  * PAM Credential Setting
 582  */
 583
 584 static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
 585 {
 586         int pam_error;
 587         NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
 588
 589         /*
 590          * This will allow samba to aquire a kerberos token. And, when
 591          * exporting an AFS cell, be able to /write/ to this cell.
 592          */
 593
 594         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 595         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 596         switch( pam_error ) {
 597                 case PAM_CRED_UNAVAIL:
 598                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 599                         break;
 600                 case PAM_CRED_EXPIRED:
 601                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 602                         break;
 603                 case PAM_USER_UNKNOWN:
 604                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 605                         break;
 606                 case PAM_CRED_ERR:
 607                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 608                         break;
 609                 case PAM_SUCCESS:
 610                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 611                         break;
 612                 default:
 613                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 614                         break;
 615         }
 616
 617         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 618         return nt_status;
 619 }
 620
 621 /*
 622  * PAM Internal Session Handler
 623  */
 624 static BOOL smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, BOOL flag)
 625 {
 626         int pam_error;
 627
 628 #ifdef PAM_TTY
 629         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 630         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 631         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 632                 return False;
 633 #endif
 634
 635         if (flag) {
 636                 pam_error = pam_open_session(pamh, PAM_SILENT);
 637                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 638                         return False;
 639         } else {
 640                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 641                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 642                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 643                         return False;
 644         }
 645         return (True);
 646 }
 647
 648 /*
 649  * Internal PAM Password Changer.
 650  */
 651
 652 static BOOL smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
 653 {
 654         int pam_error;
 655
 656         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 657
 658         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 659
 660         switch( pam_error ) {
 661         case PAM_AUTHTOK_ERR:
 662                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 663                 break;
 664
 665         /* This doesn't seem to be defined on Solaris. JRA */
 666 #ifdef PAM_AUTHTOK_RECOVER_ERR
 667         case PAM_AUTHTOK_RECOVER_ERR:
 668                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 669                 break;
 670 #endif
 671
 672         case PAM_AUTHTOK_LOCK_BUSY:
 673                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 674                 break;
 675         case PAM_AUTHTOK_DISABLE_AGING:
 676                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 677                 break;
 678         case PAM_PERM_DENIED:
 679                 DEBUG(0, ("PAM: Permission denied.\n"));
 680                 break;
 681         case PAM_TRY_AGAIN:
 682                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 683                 break;
 684         case PAM_USER_UNKNOWN:
 685                 DEBUG(0, ("PAM: User not known to PAM\n"));
 686                 break;
 687         case PAM_SUCCESS:
 688                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 689                 break;
 690         default:
 691                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 692         }
 693
 694         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 695                 return False;
 696         }
 697
 698         /* If this point is reached, the password has changed. */
 699         return True;
 700 }
 701
 702 /*
 703  * PAM Externally accessible Session handler
 704  */
 705
 706 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 707 {
 708         pam_handle_t *pamh = NULL;
 709         struct pam_conv *pconv = NULL;
 710
 711         /* Ignore PAM if told to. */
 712
 713         if (!lp_obey_pam_restrictions())
 714                 return True;
 715
 716         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 717                 return False;
 718
 719         if (!smb_pam_start(&pamh, user, rhost, pconv))
 720                 return False;
 721
 722         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 723                 smb_pam_end(pamh, pconv);
 724                 return False;
 725         }
 726
 727         return smb_pam_end(pamh, pconv);
 728 }
 729
 730 /*
 731  * PAM Externally accessible Session handler
 732  */
 733
 734 BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
 735 {
 736         pam_handle_t *pamh = NULL;
 737         struct pam_conv *pconv = NULL;
 738
 739         /* Ignore PAM if told to. */
 740
 741         if (!lp_obey_pam_restrictions())
 742                 return True;
 743
 744         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 745                 return False;
 746
 747         if (!smb_pam_start(&pamh, user, rhost, pconv))
 748                 return False;
 749
 750         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 751                 smb_pam_end(pamh, pconv);
 752                 return False;
 753         }
 754
 755         return smb_pam_end(pamh, pconv);
 756 }
 757
 758 /*
 759  * PAM Externally accessible Account handler
 760  */
 761
 762 NTSTATUS smb_pam_accountcheck(const char * user)
 763 {
 764         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 765         pam_handle_t *pamh = NULL;
 766         struct pam_conv *pconv = NULL;
 767
 768         /* Ignore PAM if told to. */
 769
 770         if (!lp_obey_pam_restrictions())
 771                 return NT_STATUS_OK;
 772
 773         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 774                 return NT_STATUS_NO_MEMORY;
 775
 776         if (!smb_pam_start(&pamh, user, NULL, pconv))
 777                 return NT_STATUS_ACCOUNT_DISABLED;
 778
 779         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
 780                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 781
 782         smb_pam_end(pamh, pconv);
 783         return nt_status;
 784 }
 785
 786 /*
 787  * PAM Password Validation Suite
 788  */
 789
 790 NTSTATUS smb_pam_passcheck(const char * user, const char * password)
 791 {
 792         pam_handle_t *pamh = NULL;
 793         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 794         struct pam_conv *pconv = NULL;
 795
 796         /*
 797          * Note we can't ignore PAM here as this is the only
 798          * way of doing auths on plaintext passwords when
 799          * compiled --with-pam.
 800          */
 801
 802         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 803                 return NT_STATUS_LOGON_FAILURE;
 804
 805         if (!smb_pam_start(&pamh, user, NULL, pconv))
 806                 return NT_STATUS_LOGON_FAILURE;
 807
 808         if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
 809                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 810                 smb_pam_end(pamh, pconv);
 811                 return nt_status;
 812         }
 813
 814         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
 815                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 816                 smb_pam_end(pamh, pconv);
 817                 return nt_status;
 818         }
 819
 820         if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
 821                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 822                 smb_pam_end(pamh, pconv);
 823                 return nt_status;
 824         }
 825
 826         smb_pam_end(pamh, pconv);
 827         return nt_status;
 828 }
 829
 830 /*
 831  * PAM Password Change Suite
 832  */
 833
 834 BOOL smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
 835 {
 836         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 837         struct pam_conv *pconv = NULL;
 838         pam_handle_t *pamh = NULL;
 839
 840         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 841                 return False;
 842
 843         if(!smb_pam_start(&pamh, user, NULL, pconv))
 844                 return False;
 845
 846         if (!smb_pam_chauthtok(pamh, user)) {
 847                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 848                 smb_pam_end(pamh, pconv);
 849                 return False;
 850         }
 851
 852         return smb_pam_end(pamh, pconv);
 853 }
 854
 855 #else
 856
 857 /* If PAM not used, no PAM restrictions on accounts. */
 858 NTSTATUS smb_pam_accountcheck(const char * user)
 859 {
 860         return NT_STATUS_OK;
 861 }
 862
 863 /* If PAM not used, also no PAM restrictions on sessions. */
 864 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 865 {
 866         return True;
 867 }
 868
 869 /* If PAM not used, also no PAM restrictions on sessions. */
 870 BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
 871 {
 872         return True;
 873 }
 874 #endif /* WITH_PAM */