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