source3/auth/pampass.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    PAM Password checking
   4    Copyright (C) Andrew Tridgell 1992-2001
   5    Copyright (C) John H Terpsta 1999-2001
   6    Copyright (C) Andrew Bartlett 2001
   7    Copyright (C) Jeremy Allison 2001
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * This module provides PAM based functions for validation of
  25  * username/password pairs, account managment, session and access control.
  26  * Note: SMB password checking is done in smbpass.c
  27  */
  28
  29 #include "includes.h"
  30
  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 static char *smb_pam_copy_string(const char *s)
  63 {
  64         if (s == NULL) {
  65                 return NULL;
  66         }
  67         return SMB_STRDUP(s);
  68 }
  69
  70 static char *smb_pam_copy_fstring(const char *s)
  71 {
  72         if (s[0] == '\0') {
  73                 return NULL;
  74         }
  75         return SMB_STRDUP(s);
  76 }
  77
  78 /*******************************************************************
  79  PAM error handler.
  80  *********************************************************************/
  81
  82 static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
  83 {
  84
  85         if( pam_error != PAM_SUCCESS) {
  86                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  87                                 msg, pam_strerror(pamh, pam_error)));
  88                 return False;
  89         }
  90         return True;
  91 }
  92
  93 /*******************************************************************
  94  This function is a sanity check, to make sure that we NEVER report
  95  failure as sucess.
  96 *********************************************************************/
  97
  98 static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
  99                                             const char *msg, int dbglvl,
 100                                             NTSTATUS *nt_status)
 101 {
 102         *nt_status = pam_to_nt_status(pam_error);
 103
 104         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
 105                 return True;
 106
 107         if (NT_STATUS_IS_OK(*nt_status)) {
 108                 /* Complain LOUDLY */
 109                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
 110 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
 111                 *nt_status = NT_STATUS_LOGON_FAILURE;
 112         }
 113         return False;
 114 }
 115
 116 /*
 117  * PAM conversation function
 118  * Here we assume (for now, at least) that echo on means login name, and
 119  * echo off means password.
 120  */
 121
 122 static int smb_pam_conv(int num_msg,
 123                     const struct pam_message **msg,
 124                     struct pam_response **resp,
 125                     void *appdata_ptr)
 126 {
 127         int replies = 0;
 128         struct pam_response *reply = NULL;
 129         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 130
 131         *resp = NULL;
 132
 133         if (num_msg <= 0)
 134                 return PAM_CONV_ERR;
 135
 136         /*
 137          * Apparantly HPUX has a buggy PAM that doesn't support the
 138          * appdata_ptr. Fail if this is the case. JRA.
 139          */
 140
 141         if (udp == NULL) {
 142                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 143                 return PAM_CONV_ERR;
 144         }
 145
 146         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 147         if (!reply)
 148                 return PAM_CONV_ERR;
 149
 150         memset(reply, '\0', sizeof(struct pam_response) * num_msg);
 151
 152         for (replies = 0; replies < num_msg; replies++) {
 153                 switch (msg[replies]->msg_style) {
 154                         case PAM_PROMPT_ECHO_ON:
 155                                 reply[replies].resp_retcode = PAM_SUCCESS;
 156                                 reply[replies].resp = smb_pam_copy_string(
 157                                         udp->PAM_username);
 158                                 /* PAM frees resp */
 159                                 break;
 160
 161                         case PAM_PROMPT_ECHO_OFF:
 162                                 reply[replies].resp_retcode = PAM_SUCCESS;
 163                                 reply[replies].resp = smb_pam_copy_string(
 164                                         udp->PAM_password);
 165                                 /* PAM frees resp */
 166                                 break;
 167
 168                         case PAM_TEXT_INFO:
 169                                 /* fall through */
 170
 171                         case PAM_ERROR_MSG:
 172                                 /* ignore it... */
 173                                 reply[replies].resp_retcode = PAM_SUCCESS;
 174                                 reply[replies].resp = NULL;
 175                                 break;
 176
 177                         default:
 178                                 /* Must be an error of some sort... */
 179                                 SAFE_FREE(reply);
 180                                 return PAM_CONV_ERR;
 181                 }
 182         }
 183         if (reply)
 184                 *resp = reply;
 185         return PAM_SUCCESS;
 186 }
 187
 188 /*
 189  * PAM password change conversation function
 190  * Here we assume (for now, at least) that echo on means login name, and
 191  * echo off means password.
 192  */
 193
 194 static void special_char_sub(char *buf)
 195 {
 196         all_string_sub(buf, "\\n", "", 0);
 197         all_string_sub(buf, "\\r", "", 0);
 198         all_string_sub(buf, "\\s", " ", 0);
 199         all_string_sub(buf, "\\t", "\t", 0);
 200 }
 201
 202 static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
 203 {
 204         fstring_sub(buf, "%u", username);
 205         all_string_sub(buf, "%o", oldpass, sizeof(fstring));
 206         all_string_sub(buf, "%n", newpass, sizeof(fstring));
 207 }
 208
 209
 210 struct chat_struct {
 211         struct chat_struct *next, *prev;
 212         fstring prompt;
 213         fstring reply;
 214 };
 215
 216 /**************************************************************
 217  Create a linked list containing chat data.
 218 ***************************************************************/
 219
 220 static struct chat_struct *make_pw_chat(const char *p)
 221 {
 222         char *prompt;
 223         char *reply;
 224         struct chat_struct *list = NULL;
 225         struct chat_struct *t;
 226         TALLOC_CTX *frame = talloc_stackframe();
 227
 228         while (1) {
 229                 t = SMB_MALLOC_P(struct chat_struct);
 230                 if (!t) {
 231                         DEBUG(0,("make_pw_chat: malloc failed!\n"));
 232                         TALLOC_FREE(frame);
 233                         return NULL;
 234                 }
 235
 236                 ZERO_STRUCTP(t);
 237
 238                 DLIST_ADD_END(list, t, struct chat_struct*);
 239
 240                 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
 241                         break;
 242                 }
 243
 244                 if (strequal(prompt,".")) {
 245                         fstrcpy(prompt,"*");
 246                 }
 247
 248                 special_char_sub(prompt);
 249                 fstrcpy(t->prompt, prompt);
 250                 strlower_m(t->prompt);
 251                 trim_char(t->prompt, ' ', ' ');
 252
 253                 if (!next_token_talloc(frame, &p, &reply, NULL)) {
 254                         break;
 255                 }
 256
 257                 if (strequal(reply,".")) {
 258                         fstrcpy(reply,"");
 259                 }
 260
 261                 special_char_sub(reply);
 262                 fstrcpy(t->reply, reply);
 263                 strlower_m(t->reply);
 264                 trim_char(t->reply, ' ', ' ');
 265
 266         }
 267         TALLOC_FREE(frame);
 268         return list;
 269 }
 270
 271 static void free_pw_chat(struct chat_struct *list)
 272 {
 273     while (list) {
 274         struct chat_struct *old_head = list;
 275         DLIST_REMOVE(list, list);
 276         SAFE_FREE(old_head);
 277     }
 278 }
 279
 280 static int smb_pam_passchange_conv(int num_msg,
 281                                 const struct pam_message **msg,
 282                                 struct pam_response **resp,
 283                                 void *appdata_ptr)
 284 {
 285         int replies = 0;
 286         struct pam_response *reply = NULL;
 287         fstring current_prompt;
 288         fstring current_reply;
 289         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 290         struct chat_struct *pw_chat;
 291         struct chat_struct *t;
 292         bool found;
 293         *resp = NULL;
 294
 295         DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
 296
 297         if (num_msg <= 0)
 298                 return PAM_CONV_ERR;
 299
 300         if ((pw_chat = make_pw_chat(lp_passwd_chat())) == NULL)
 301                 return PAM_CONV_ERR;
 302
 303         /*
 304          * Apparantly HPUX has a buggy PAM that doesn't support the
 305          * appdata_ptr. Fail if this is the case. JRA.
 306          */
 307
 308         if (udp == NULL) {
 309                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 310                 free_pw_chat(pw_chat);
 311                 return PAM_CONV_ERR;
 312         }
 313
 314         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 315         if (!reply) {
 316                 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
 317                 free_pw_chat(pw_chat);
 318                 return PAM_CONV_ERR;
 319         }
 320
 321         for (replies = 0; replies < num_msg; replies++) {
 322                 found = False;
 323                 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
 324                 switch (msg[replies]->msg_style) {
 325                 case PAM_PROMPT_ECHO_ON:
 326                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 327                         fstrcpy(current_prompt, msg[replies]->msg);
 328                         trim_char(current_prompt, ' ', ' ');
 329                         for (t=pw_chat; t; t=t->next) {
 330
 331                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
 332                                                 t->prompt, current_prompt ));
 333
 334                                 if (unix_wild_match(t->prompt, current_prompt)) {
 335                                         fstrcpy(current_reply, t->reply);
 336                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
 337                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 338 #ifdef DEBUG_PASSWORD
 339                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actually sent: %s\n", current_reply));
 340 #endif
 341                                         reply[replies].resp_retcode = PAM_SUCCESS;
 342                                         reply[replies].resp = smb_pam_copy_fstring(
 343                                                 current_reply);
 344                                         found = True;
 345                                         break;
 346                                 }
 347                         }
 348                         /* PAM frees resp */
 349                         if (!found) {
 350                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 351                                 free_pw_chat(pw_chat);
 352                                 SAFE_FREE(reply);
 353                                 return PAM_CONV_ERR;
 354                         }
 355                         break;
 356
 357                 case PAM_PROMPT_ECHO_OFF:
 358                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 359                         fstrcpy(current_prompt, msg[replies]->msg);
 360                         trim_char(current_prompt, ' ', ' ');
 361                         for (t=pw_chat; t; t=t->next) {
 362
 363                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
 364                                                 t->prompt, current_prompt ));
 365
 366                                 if (unix_wild_match(t->prompt, current_prompt)) {
 367                                         fstrcpy(current_reply, t->reply);
 368                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
 369                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 370                                         reply[replies].resp_retcode = PAM_SUCCESS;
 371                                         reply[replies].resp = smb_pam_copy_fstring(
 372                                                 current_reply);
 373 #ifdef DEBUG_PASSWORD
 374                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actually sent: %s\n", current_reply));
 375 #endif
 376                                         found = True;
 377                                         break;
 378                                 }
 379                         }
 380                         /* PAM frees resp */
 381
 382                         if (!found) {
 383                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 384                                 free_pw_chat(pw_chat);
 385                                 SAFE_FREE(reply);
 386                                 return PAM_CONV_ERR;
 387                         }
 388                         break;
 389
 390                 case PAM_TEXT_INFO:
 391                         /* fall through */
 392
 393                 case PAM_ERROR_MSG:
 394                         /* ignore it... */
 395                         reply[replies].resp_retcode = PAM_SUCCESS;
 396                         reply[replies].resp = NULL;
 397                         break;
 398
 399                 default:
 400                         /* Must be an error of some sort... */
 401                         free_pw_chat(pw_chat);
 402                         SAFE_FREE(reply);
 403                         return PAM_CONV_ERR;
 404                 }
 405         }
 406
 407         free_pw_chat(pw_chat);
 408         if (reply)
 409                 *resp = reply;
 410         return PAM_SUCCESS;
 411 }
 412
 413 /***************************************************************************
 414  Free up a malloced pam_conv struct.
 415 ****************************************************************************/
 416
 417 static void smb_free_pam_conv(struct pam_conv *pconv)
 418 {
 419         if (pconv)
 420                 SAFE_FREE(pconv->appdata_ptr);
 421
 422         SAFE_FREE(pconv);
 423 }
 424
 425 /***************************************************************************
 426  Allocate a pam_conv struct.
 427 ****************************************************************************/
 428
 429 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
 430                                         const char *passwd, const char *newpass)
 431 {
 432         struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
 433         struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
 434
 435         if (pconv == NULL || udp == NULL) {
 436                 SAFE_FREE(pconv);
 437                 SAFE_FREE(udp);
 438                 return NULL;
 439         }
 440
 441         udp->PAM_username = user;
 442         udp->PAM_password = passwd;
 443         udp->PAM_newpassword = newpass;
 444
 445         pconv->conv = smb_pam_conv_fnptr;
 446         pconv->appdata_ptr = (void *)udp;
 447         return pconv;
 448 }
 449
 450 /*
 451  * PAM Closing out cleanup handler
 452  */
 453
 454 static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 455 {
 456         int pam_error;
 457
 458         smb_free_pam_conv(smb_pam_conv_ptr);
 459
 460         if( pamh != NULL ) {
 461                 pam_error = pam_end(pamh, 0);
 462                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 463                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 464                         return True;
 465                 }
 466         }
 467         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 468         return False;
 469 }
 470
 471 /*
 472  * Start PAM authentication for specified account
 473  */
 474
 475 static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
 476 {
 477         int pam_error;
 478
 479         *pamh = (pam_handle_t *)NULL;
 480
 481         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 482
 483         pam_error = pam_start("samba", user, pconv, pamh);
 484         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 485                 *pamh = (pam_handle_t *)NULL;
 486                 return False;
 487         }
 488
 489 #if HAVE_PAM_RHOST
 490         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 491         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 492         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 493                 smb_pam_end(*pamh, pconv);
 494                 *pamh = (pam_handle_t *)NULL;
 495                 return False;
 496         }
 497 #endif
 498 #if HAVE_PAM_TTY
 499         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 500         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 501         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 502                 smb_pam_end(*pamh, pconv);
 503                 *pamh = (pam_handle_t *)NULL;
 504                 return False;
 505         }
 506 #endif
 507         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 508         return True;
 509 }
 510
 511 /*
 512  * PAM Authentication Handler
 513  */
 514 static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
 515 {
 516         int pam_error;
 517         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 518
 519         /*
 520          * To enable debugging set in /etc/pam.d/samba:
 521          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 522          */
 523
 524         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 525         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 526         switch( pam_error ){
 527                 case PAM_AUTH_ERR:
 528                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
 529                         break;
 530                 case PAM_CRED_INSUFFICIENT:
 531                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 532                         break;
 533                 case PAM_AUTHINFO_UNAVAIL:
 534                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 535                         break;
 536                 case PAM_USER_UNKNOWN:
 537                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 538                         break;
 539                 case PAM_MAXTRIES:
 540                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 541                         break;
 542                 case PAM_ABORT:
 543                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 544                         break;
 545                 case PAM_SUCCESS:
 546                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 547                         break;
 548                 default:
 549                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 550                         break;
 551         }
 552
 553         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 554         return nt_status;
 555 }
 556
 557 /*
 558  * PAM Account Handler
 559  */
 560 static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
 561 {
 562         int pam_error;
 563         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 564
 565         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 566         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 567         switch( pam_error ) {
 568                 case PAM_AUTHTOK_EXPIRED:
 569                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 570                         break;
 571                 case PAM_ACCT_EXPIRED:
 572                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 573                         break;
 574                 case PAM_AUTH_ERR:
 575                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 576                         break;
 577                 case PAM_PERM_DENIED:
 578                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 579                         break;
 580                 case PAM_USER_UNKNOWN:
 581                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 582                         break;
 583                 case PAM_SUCCESS:
 584                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 585                         break;
 586                 default:
 587                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 588                         break;
 589         }
 590
 591         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 592         return nt_status;
 593 }
 594
 595 /*
 596  * PAM Credential Setting
 597  */
 598
 599 static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
 600 {
 601         int pam_error;
 602         NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
 603
 604         /*
 605          * This will allow samba to aquire a kerberos token. And, when
 606          * exporting an AFS cell, be able to /write/ to this cell.
 607          */
 608
 609         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 610         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 611         switch( pam_error ) {
 612                 case PAM_CRED_UNAVAIL:
 613                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 614                         break;
 615                 case PAM_CRED_EXPIRED:
 616                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 617                         break;
 618                 case PAM_USER_UNKNOWN:
 619                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 620                         break;
 621                 case PAM_CRED_ERR:
 622                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 623                         break;
 624                 case PAM_SUCCESS:
 625                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 626                         break;
 627                 default:
 628                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 629                         break;
 630         }
 631
 632         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 633         return nt_status;
 634 }
 635
 636 /*
 637  * PAM Internal Session Handler
 638  */
 639 static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
 640 {
 641         int pam_error;
 642
 643 #if HAVE_PAM_TTY
 644         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 645         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 646         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 647                 return False;
 648 #endif
 649
 650         if (flag) {
 651                 pam_error = pam_open_session(pamh, PAM_SILENT);
 652                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 653                         return False;
 654         } else {
 655                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 656                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 657                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 658                         return False;
 659         }
 660         return (True);
 661 }
 662
 663 /*
 664  * Internal PAM Password Changer.
 665  */
 666
 667 static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
 668 {
 669         int pam_error;
 670
 671         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 672
 673         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 674
 675         switch( pam_error ) {
 676         case PAM_AUTHTOK_ERR:
 677                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 678                 break;
 679
 680         /* This doesn't seem to be defined on Solaris. JRA */
 681 #ifdef PAM_AUTHTOK_RECOVER_ERR
 682         case PAM_AUTHTOK_RECOVER_ERR:
 683                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 684                 break;
 685 #endif
 686
 687         case PAM_AUTHTOK_LOCK_BUSY:
 688                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 689                 break;
 690         case PAM_AUTHTOK_DISABLE_AGING:
 691                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 692                 break;
 693         case PAM_PERM_DENIED:
 694                 DEBUG(0, ("PAM: Permission denied.\n"));
 695                 break;
 696         case PAM_TRY_AGAIN:
 697                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 698                 break;
 699         case PAM_USER_UNKNOWN:
 700                 DEBUG(0, ("PAM: User not known to PAM\n"));
 701                 break;
 702         case PAM_SUCCESS:
 703                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 704                 break;
 705         default:
 706                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 707         }
 708
 709         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 710                 return False;
 711         }
 712
 713         /* If this point is reached, the password has changed. */
 714         return True;
 715 }
 716
 717 /*
 718  * PAM Externally accessible Session handler
 719  */
 720
 721 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 722 {
 723         pam_handle_t *pamh = NULL;
 724         struct pam_conv *pconv = NULL;
 725
 726         /* Ignore PAM if told to. */
 727
 728         if (!lp_obey_pam_restrictions())
 729                 return True;
 730
 731         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 732                 return False;
 733
 734         if (!smb_pam_start(&pamh, user, rhost, pconv))
 735                 return False;
 736
 737         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 738                 smb_pam_end(pamh, pconv);
 739                 return False;
 740         }
 741
 742         return smb_pam_end(pamh, pconv);
 743 }
 744
 745 /*
 746  * PAM Externally accessible Session handler
 747  */
 748
 749 bool smb_pam_close_session(char *user, char *tty, char *rhost)
 750 {
 751         pam_handle_t *pamh = NULL;
 752         struct pam_conv *pconv = NULL;
 753
 754         /* Ignore PAM if told to. */
 755
 756         if (!lp_obey_pam_restrictions())
 757                 return True;
 758
 759         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 760                 return False;
 761
 762         if (!smb_pam_start(&pamh, user, rhost, pconv))
 763                 return False;
 764
 765         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 766                 smb_pam_end(pamh, pconv);
 767                 return False;
 768         }
 769
 770         return smb_pam_end(pamh, pconv);
 771 }
 772
 773 /*
 774  * PAM Externally accessible Account handler
 775  */
 776
 777 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 778 {
 779         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 780         pam_handle_t *pamh = NULL;
 781         struct pam_conv *pconv = NULL;
 782
 783         /* Ignore PAM if told to. */
 784
 785         if (!lp_obey_pam_restrictions())
 786                 return NT_STATUS_OK;
 787
 788         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 789                 return NT_STATUS_NO_MEMORY;
 790
 791         if (!smb_pam_start(&pamh, user, rhost, pconv))
 792                 return NT_STATUS_ACCOUNT_DISABLED;
 793
 794         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
 795                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 796
 797         smb_pam_end(pamh, pconv);
 798         return nt_status;
 799 }
 800
 801 /*
 802  * PAM Password Validation Suite
 803  */
 804
 805 NTSTATUS smb_pam_passcheck(const char * user, const char * rhost,
 806                            const char * password)
 807 {
 808         pam_handle_t *pamh = NULL;
 809         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 810         struct pam_conv *pconv = NULL;
 811
 812         /*
 813          * Note we can't ignore PAM here as this is the only
 814          * way of doing auths on plaintext passwords when
 815          * compiled --with-pam.
 816          */
 817
 818         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 819                 return NT_STATUS_LOGON_FAILURE;
 820
 821         if (!smb_pam_start(&pamh, user, rhost, pconv))
 822                 return NT_STATUS_LOGON_FAILURE;
 823
 824         if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
 825                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 826                 smb_pam_end(pamh, pconv);
 827                 return nt_status;
 828         }
 829
 830         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
 831                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 832                 smb_pam_end(pamh, pconv);
 833                 return nt_status;
 834         }
 835
 836         if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
 837                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 838                 smb_pam_end(pamh, pconv);
 839                 return nt_status;
 840         }
 841
 842         smb_pam_end(pamh, pconv);
 843         return nt_status;
 844 }
 845
 846 /*
 847  * PAM Password Change Suite
 848  */
 849
 850 bool smb_pam_passchange(const char *user, const char *rhost,
 851                         const char *oldpassword, const char *newpassword)
 852 {
 853         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 854         struct pam_conv *pconv = NULL;
 855         pam_handle_t *pamh = NULL;
 856
 857         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 858                 return False;
 859
 860         if(!smb_pam_start(&pamh, user, rhost, pconv))
 861                 return False;
 862
 863         if (!smb_pam_chauthtok(pamh, user)) {
 864                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 865                 smb_pam_end(pamh, pconv);
 866                 return False;
 867         }
 868
 869         return smb_pam_end(pamh, pconv);
 870 }
 871
 872 #else
 873
 874 /* If PAM not used, no PAM restrictions on accounts. */
 875 NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
 876 {
 877         return NT_STATUS_OK;
 878 }
 879
 880 /* If PAM not used, also no PAM restrictions on sessions. */
 881 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 882 {
 883         return True;
 884 }
 885
 886 /* If PAM not used, also no PAM restrictions on sessions. */
 887 bool smb_pam_close_session(char *in_user, char *tty, char *rhost)
 888 {
 889         return True;
 890 }
 891 #endif /* WITH_PAM */