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