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