source/passdb/pampass.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.2.
   4    PAM Password checking
   5    Copyright (C) Andrew Tridgell 1992-2001
   6    Copyright (C) John H Terpsta 1999-2001
   7    Copyright (C) Andrew Bartlett 2001
   8    Copyright (C) Jeremy Allison 2001
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 /*
  26  * This module provides PAM based functions for validation of
  27  * username/password pairs, account managment, session and access control.
  28  * Note: SMB password checking is done in smbpass.c
  29  */
  30
  31 #include "includes.h"
  32
  33 extern int DEBUGLEVEL;
  34
  35 #ifdef WITH_PAM
  36
  37 /*******************************************************************
  38  * Handle PAM authentication
  39  *      - Access, Authentication, Session, Password
  40  *   Note: See PAM Documentation and refer to local system PAM implementation
  41  *   which determines what actions/limitations/allowances become affected.
  42  *********************************************************************/
  43
  44 #include <security/pam_appl.h>
  45
  46 /*
  47  * Structure used to communicate between the conversation function
  48  * and the server_login/change password functions.
  49  */
  50
  51 struct smb_pam_userdata {
  52         char *PAM_username;
  53         char *PAM_password;
  54         char *PAM_newpassword;
  55 };
  56
  57 typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
  58
  59 /*
  60  *  Macros to help make life easy
  61  */
  62 #define COPY_STRING(s) (s) ? strdup(s) : NULL
  63
  64 /*******************************************************************
  65  PAM error handler.
  66  *********************************************************************/
  67
  68 static BOOL smb_pam_error_handler(pam_handle_t *pamh, int pam_error, char *msg, int dbglvl)
  69 {
  70
  71         if( pam_error != PAM_SUCCESS) {
  72                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  73                                 msg, pam_strerror(pamh, pam_error)));
  74                 return False;
  75         }
  76         return True;
  77 }
  78
  79 /*******************************************************************
  80  This function is a sanity check, to make sure that we NEVER report
  81  failure as sucess.
  82 *********************************************************************/
  83
  84 static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
  85                                                         char *msg, int dbglvl, uint32 *nt_status)
  86 {
  87         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
  88                 return True;
  89
  90         if (*nt_status == NT_STATUS_NOPROBLEMO) {
  91                 /* Complain LOUDLY */
  92                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
  93 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
  94                 *nt_status = NT_STATUS_LOGON_FAILURE;
  95         }
  96         return False;
  97 }
  98
  99 /*
 100  * PAM conversation function
 101  * Here we assume (for now, at least) that echo on means login name, and
 102  * echo off means password.
 103  */
 104
 105 static int smb_pam_conv(int num_msg,
 106                     const struct pam_message **msg,
 107                     struct pam_response **resp,
 108                     void *appdata_ptr)
 109 {
 110         int replies = 0;
 111         struct pam_response *reply = NULL;
 112         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 113
 114         *resp = NULL;
 115
 116         reply = malloc(sizeof(struct pam_response) * num_msg);
 117         if (!reply)
 118                 return PAM_CONV_ERR;
 119
 120         for (replies = 0; replies < num_msg; replies++) {
 121                 switch (msg[replies]->msg_style) {
 122                         case PAM_PROMPT_ECHO_ON:
 123                                 reply[replies].resp_retcode = PAM_SUCCESS;
 124                                 reply[replies].resp = COPY_STRING(udp->PAM_username);
 125                                 /* PAM frees resp */
 126                                 break;
 127
 128                         case PAM_PROMPT_ECHO_OFF:
 129                                 reply[replies].resp_retcode = PAM_SUCCESS;
 130                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 131                                 /* PAM frees resp */
 132                                 break;
 133
 134                         case PAM_TEXT_INFO:
 135                                 /* fall through */
 136
 137                         case PAM_ERROR_MSG:
 138                                 /* ignore it... */
 139                                 reply[replies].resp_retcode = PAM_SUCCESS;
 140                                 reply[replies].resp = NULL;
 141                                 break;
 142
 143                         default:
 144                                 /* Must be an error of some sort... */
 145                                 free(reply);
 146                                 return PAM_CONV_ERR;
 147                 }
 148         }
 149         if (reply)
 150                 *resp = reply;
 151         return PAM_SUCCESS;
 152 }
 153
 154 /*
 155  * PAM password change conversation function
 156  * Here we assume (for now, at least) that echo on means login name, and
 157  * echo off means password.
 158  */
 159
 160 static int smb_pam_passchange_conv(int num_msg,
 161                                 const struct pam_message **msg,
 162                                 struct pam_response **resp,
 163                                 void *appdata_ptr)
 164 {
 165         int replies = 0;
 166         struct pam_response *reply = NULL;
 167         fstring currentpw_prompt;
 168         fstring newpw_prompt;
 169         fstring repeatpw_prompt;
 170         char *p = lp_passwd_chat();
 171         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 172
 173         /* Get the prompts... */
 174
 175         if (!next_token(&p, currentpw_prompt, NULL, sizeof(fstring)))
 176                 return PAM_CONV_ERR;
 177         if (!next_token(&p, newpw_prompt, NULL, sizeof(fstring)))
 178                 return PAM_CONV_ERR;
 179         if (!next_token(&p, repeatpw_prompt, NULL, sizeof(fstring)))
 180                 return PAM_CONV_ERR;
 181
 182         *resp = NULL;
 183
 184         reply = malloc(sizeof(struct pam_response) * num_msg);
 185         if (!reply)
 186                 return PAM_CONV_ERR;
 187
 188         for (replies = 0; replies < num_msg; replies++) {
 189                 switch (msg[replies]->msg_style) {
 190                 case PAM_PROMPT_ECHO_ON:
 191                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: Replied: %s\n", msg[replies]->msg));
 192                         reply[replies].resp_retcode = PAM_SUCCESS;
 193                         reply[replies].resp = COPY_STRING(udp->PAM_username);
 194                         /* PAM frees resp */
 195                         break;
 196
 197                 case PAM_PROMPT_ECHO_OFF:
 198                         reply[replies].resp_retcode = PAM_SUCCESS;
 199                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: Replied: %s\n", msg[replies]->msg));
 200                         if (strncmp(currentpw_prompt, msg[replies]->msg, strlen(currentpw_prompt)) == 0) {
 201                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 202                         } else if (strncmp(newpw_prompt, msg[replies]->msg, strlen(newpw_prompt)) == 0) {
 203                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 204                         } else if (strncmp(repeatpw_prompt, msg[replies]->msg, strlen(repeatpw_prompt)) == 0) {
 205                                 reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
 206                         } else {
 207                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 208                                 DEBUG(5,("smb_pam_passchange_conv: Prompts available:\n CurrentPW: \"%s\"\n NewPW: \"%s\"\n \
 209 RepeatPW: \"%s\"\n",currentpw_prompt,newpw_prompt,repeatpw_prompt));
 210                                 free(reply);
 211                                 reply = NULL;
 212                                 return PAM_CONV_ERR;
 213                         }
 214                         /* PAM frees resp */
 215                         break;
 216
 217                 case PAM_TEXT_INFO:
 218                         /* fall through */
 219
 220                 case PAM_ERROR_MSG:
 221                         /* ignore it... */
 222                         reply[replies].resp_retcode = PAM_SUCCESS;
 223                         reply[replies].resp = NULL;
 224                         break;
 225
 226                 default:
 227                         /* Must be an error of some sort... */
 228                         free(reply);
 229                         reply = NULL;
 230                         return PAM_CONV_ERR;
 231                 }
 232         }
 233
 234         if (reply)
 235                 *resp = reply;
 236         return PAM_SUCCESS;
 237 }
 238
 239 /***************************************************************************
 240  Free up a malloced pam_conv struct.
 241 ****************************************************************************/
 242
 243 static void smb_free_pam_conv(struct pam_conv *pconv)
 244 {
 245         if (pconv)
 246                 safe_free(pconv->appdata_ptr);
 247
 248         safe_free(pconv);
 249 }
 250
 251 /***************************************************************************
 252  Allocate a pam_conv struct.
 253 ****************************************************************************/
 254
 255 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, char *user,
 256                                         char *passwd, char *newpass)
 257 {
 258         struct pam_conv *pconv = (struct pam_conv *)malloc(sizeof(struct pam_conv));
 259         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)malloc(sizeof(struct smb_pam_userdata));
 260
 261         if (pconv == NULL || udp == NULL) {
 262                 safe_free(pconv);
 263                 safe_free(udp);
 264                 return NULL;
 265         }
 266
 267         udp->PAM_username = user;
 268         udp->PAM_password = passwd;
 269         udp->PAM_newpassword = newpass;
 270
 271         pconv->conv = smb_pam_conv_fnptr;
 272         pconv->appdata_ptr = (void *)udp;
 273         return pconv;
 274 }
 275
 276 /*
 277  * PAM Closing out cleanup handler
 278  */
 279
 280 static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 281 {
 282         int pam_error;
 283
 284         smb_free_pam_conv(smb_pam_conv_ptr);
 285
 286         if( pamh != NULL ) {
 287                 pam_error = pam_end(pamh, 0);
 288                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 289                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 290                         return True;
 291                 }
 292         }
 293         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 294         return False;
 295 }
 296
 297 /*
 298  * Start PAM authentication for specified account
 299  */
 300
 301 static BOOL smb_pam_start(pam_handle_t **pamh, char *user, char *rhost, struct pam_conv *pconv)
 302 {
 303         int pam_error;
 304
 305         *pamh = (pam_handle_t *)NULL;
 306
 307         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 308
 309         pam_error = pam_start("samba", user, pconv, pamh);
 310         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 311                 *pamh = (pam_handle_t *)NULL;
 312                 return False;
 313         }
 314
 315         if (rhost == NULL) {
 316                 rhost = client_name();
 317                 if (strequal(rhost,"UNKNOWN"))
 318                         rhost = client_addr();
 319         }
 320
 321 #ifdef PAM_RHOST
 322         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
 323         pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
 324         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 325                 smb_pam_end(*pamh, pconv);
 326                 *pamh = (pam_handle_t *)NULL;
 327                 return False;
 328         }
 329 #endif
 330 #ifdef PAM_TTY
 331         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 332         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 333         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 334                 smb_pam_end(*pamh, pconv);
 335                 *pamh = (pam_handle_t *)NULL;
 336                 return False;
 337         }
 338 #endif
 339         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 340         return True;
 341 }
 342
 343 /*
 344  * PAM Authentication Handler
 345  */
 346 static uint32 smb_pam_auth(pam_handle_t *pamh, char *user)
 347 {
 348         int pam_error;
 349         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 350
 351         /*
 352          * To enable debugging set in /etc/pam.d/samba:
 353          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 354          */
 355
 356         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 357         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 358         switch( pam_error ){
 359                 case PAM_AUTH_ERR:
 360                         DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
 361                         nt_status = NT_STATUS_WRONG_PASSWORD;
 362                         break;
 363                 case PAM_CRED_INSUFFICIENT:
 364                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 365                         nt_status = NT_STATUS_INSUFFICIENT_LOGON_INFO;
 366                         break;
 367                 case PAM_AUTHINFO_UNAVAIL:
 368                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 369                         nt_status = NT_STATUS_LOGON_FAILURE;
 370                         break;
 371                 case PAM_USER_UNKNOWN:
 372                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 373                         nt_status = NT_STATUS_NO_SUCH_USER;
 374                         break;
 375                 case PAM_MAXTRIES:
 376                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 377                         nt_status = NT_STATUS_REMOTE_SESSION_LIMIT;
 378                         break;
 379                 case PAM_ABORT:
 380                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 381                         nt_status = NT_STATUS_LOGON_FAILURE;
 382                         break;
 383                 case PAM_SUCCESS:
 384                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 385                         nt_status = NT_STATUS_NOPROBLEMO;
 386                         break;
 387                 default:
 388                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 389                         nt_status = NT_STATUS_LOGON_FAILURE;
 390                         break;
 391         }
 392
 393         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 394         return nt_status;
 395 }
 396
 397 /*
 398  * PAM Account Handler
 399  */
 400 static uint32 smb_pam_account(pam_handle_t *pamh, char * user)
 401 {
 402         int pam_error;
 403         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 404
 405         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 406         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 407         switch( pam_error ) {
 408                 case PAM_AUTHTOK_EXPIRED:
 409                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 410                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 411                         break;
 412                 case PAM_ACCT_EXPIRED:
 413                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 414                         nt_status = NT_STATUS_ACCOUNT_EXPIRED;
 415                         break;
 416                 case PAM_AUTH_ERR:
 417                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 418                         nt_status = NT_STATUS_LOGON_FAILURE;
 419                         break;
 420                 case PAM_PERM_DENIED:
 421                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 422                         nt_status = NT_STATUS_ACCOUNT_RESTRICTION;
 423                         break;
 424                 case PAM_USER_UNKNOWN:
 425                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 426                         nt_status = NT_STATUS_NO_SUCH_USER;
 427                         break;
 428                 case PAM_SUCCESS:
 429                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 430                         nt_status = NT_STATUS_NOPROBLEMO;
 431                         break;
 432                 default:
 433                         nt_status = NT_STATUS_ACCOUNT_DISABLED;
 434                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 435                         break;
 436         }
 437
 438         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 439         return nt_status;
 440 }
 441
 442 /*
 443  * PAM Credential Setting
 444  */
 445
 446 static uint32 smb_pam_setcred(pam_handle_t *pamh, char * user)
 447 {
 448         int pam_error;
 449         uint32 nt_status = NT_STATUS_NO_TOKEN;
 450
 451         /*
 452          * This will allow samba to aquire a kerberos token. And, when
 453          * exporting an AFS cell, be able to /write/ to this cell.
 454          */
 455
 456         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 457         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 458         switch( pam_error ) {
 459                 case PAM_CRED_UNAVAIL:
 460                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 461                          nt_status = NT_STATUS_NO_TOKEN;
 462                         break;
 463                 case PAM_CRED_EXPIRED:
 464                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 465                         nt_status = NT_STATUS_PASSWORD_EXPIRED;
 466                         break;
 467                 case PAM_USER_UNKNOWN:
 468                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 469                         nt_status = NT_STATUS_NO_SUCH_USER;
 470                         break;
 471                 case PAM_CRED_ERR:
 472                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 473                         nt_status = NT_STATUS_LOGON_FAILURE;
 474                         break;
 475                 case PAM_SUCCESS:
 476                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 477                         nt_status = NT_STATUS_NOPROBLEMO;
 478                         break;
 479                 default:
 480                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 481                         nt_status = NT_STATUS_NO_TOKEN;
 482                         break;
 483         }
 484
 485         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 486         return nt_status;
 487 }
 488
 489 /*
 490  * PAM Internal Session Handler
 491  */
 492 static BOOL smb_internal_pam_session(pam_handle_t *pamh, char *user, char *tty, BOOL flag)
 493 {
 494         int pam_error;
 495
 496 #ifdef PAM_TTY
 497         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 498         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 499         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 500                 return False;
 501 #endif
 502
 503         if (flag) {
 504                 pam_error = pam_open_session(pamh, PAM_SILENT);
 505                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 506                         return False;
 507         } else {
 508                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 509                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 510                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 511                         return False;
 512         }
 513         return (True);
 514 }
 515
 516 /*
 517  * Internal PAM Password Changer.
 518  */
 519
 520 static BOOL smb_pam_chauthtok(pam_handle_t *pamh, char * user)
 521 {
 522         int pam_error;
 523
 524         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 525
 526         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 527
 528         switch( pam_error ) {
 529         case PAM_AUTHTOK_ERR:
 530                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 531                 break;
 532
 533         /* This doesn't seem to be defined on Solaris. JRA */
 534 #ifdef PAM_AUTHTOK_RECOVER_ERR
 535         case PAM_AUTHTOK_RECOVER_ERR:
 536                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 537                 break;
 538 #endif
 539
 540         case PAM_AUTHTOK_LOCK_BUSY:
 541                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 542                 break;
 543         case PAM_AUTHTOK_DISABLE_AGING:
 544                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 545                 break;
 546         case PAM_PERM_DENIED:
 547                 DEBUG(0, ("PAM: Permission denied.\n"));
 548                 break;
 549         case PAM_TRY_AGAIN:
 550                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 551                 break;
 552         case PAM_USER_UNKNOWN:
 553                 DEBUG(0, ("PAM: User not known to PAM\n"));
 554                 break;
 555         case PAM_SUCCESS:
 556                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 557                 break;
 558         default:
 559                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 560         }
 561
 562         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 563                 return False;
 564         }
 565
 566         /* If this point is reached, the password has changed. */
 567         return True;
 568 }
 569
 570 /*
 571  * PAM Externally accessible Session handler
 572  */
 573
 574 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 575 {
 576         pam_handle_t *pamh = NULL;
 577         struct pam_conv *pconv = NULL;
 578
 579         /* Ignore PAM if told to. */
 580
 581         if (!lp_obey_pam_restrictions())
 582                 return True;
 583
 584         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 585                 return False;
 586
 587         if (!smb_pam_start(&pamh, user, rhost, pconv))
 588                 return False;
 589
 590         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 591                 smb_pam_end(pamh, pconv);
 592                 return False;
 593         }
 594
 595         return smb_pam_end(pamh, pconv);
 596 }
 597
 598 /*
 599  * PAM Externally accessible Session handler
 600  */
 601
 602 BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
 603 {
 604         pam_handle_t *pamh = NULL;
 605         struct pam_conv *pconv = NULL;
 606
 607         /* Ignore PAM if told to. */
 608
 609         if (!lp_obey_pam_restrictions())
 610                 return True;
 611
 612         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 613                 return False;
 614
 615         if (!smb_pam_start(&pamh, user, rhost, pconv))
 616                 return False;
 617
 618         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 619                 smb_pam_end(pamh, pconv);
 620                 return False;
 621         }
 622
 623         return smb_pam_end(pamh, pconv);
 624 }
 625
 626 /*
 627  * PAM Externally accessible Account handler
 628  */
 629
 630 uint32 smb_pam_accountcheck(char * user)
 631 {
 632         uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
 633         pam_handle_t *pamh = NULL;
 634         struct pam_conv *pconv = NULL;
 635
 636         /* Ignore PAM if told to. */
 637
 638         if (!lp_obey_pam_restrictions())
 639                 return NT_STATUS_NOPROBLEMO;
 640
 641         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 642                 return False;
 643
 644         if (!smb_pam_start(&pamh, user, NULL, pconv))
 645                 return NT_STATUS_ACCOUNT_DISABLED;
 646
 647         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO)
 648                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 649
 650         smb_pam_end(pamh, pconv);
 651         return nt_status;
 652 }
 653
 654 /*
 655  * PAM Password Validation Suite
 656  */
 657
 658 uint32 smb_pam_passcheck(char * user, char * password)
 659 {
 660         pam_handle_t *pamh = NULL;
 661         uint32 nt_status = NT_STATUS_LOGON_FAILURE;
 662         struct pam_conv *pconv = NULL;
 663
 664         /*
 665          * Note we can't ignore PAM here as this is the only
 666          * way of doing auths on plaintext passwords when
 667          * compiled --with-pam.
 668          */
 669
 670         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 671                 return NT_STATUS_LOGON_FAILURE;
 672
 673         if (!smb_pam_start(&pamh, user, NULL, pconv))
 674                 return NT_STATUS_LOGON_FAILURE;
 675
 676         if ((nt_status = smb_pam_auth(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 677                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 678                 smb_pam_end(pamh, pconv);
 679                 return nt_status;
 680         }
 681
 682         if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 683                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 684                 smb_pam_end(pamh, pconv);
 685                 return nt_status;
 686         }
 687
 688         if ((nt_status = smb_pam_setcred(pamh, user)) != NT_STATUS_NOPROBLEMO) {
 689                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 690                 smb_pam_end(pamh, pconv);
 691                 return nt_status;
 692         }
 693
 694         smb_pam_end(pamh, pconv);
 695         return nt_status;
 696 }
 697
 698 /*
 699  * PAM Password Change Suite
 700  */
 701
 702 BOOL smb_pam_passchange(char * user, char * oldpassword, char * newpassword)
 703 {
 704         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 705         struct pam_conv *pconv = NULL;
 706         pam_handle_t *pamh = NULL;
 707
 708         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 709                 return False;
 710
 711         if(!smb_pam_start(&pamh, user, NULL, pconv))
 712                 return False;
 713
 714         if (!smb_pam_chauthtok(pamh, user)) {
 715                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 716                 smb_pam_end(pamh, pconv);
 717                 return False;
 718         }
 719
 720         return smb_pam_end(pamh, pconv);
 721 }
 722
 723 #else
 724
 725 /* If PAM not used, no PAM restrictions on accounts. */
 726  uint32 smb_pam_accountcheck(char * user)
 727 {
 728         return NT_STATUS_NOPROBLEMO;
 729 }
 730
 731 /* If PAM not used, also no PAM restrictions on sessions. */
 732  BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
 733 {
 734         return True;
 735 }
 736
 737 /* If PAM not used, also no PAM restrictions on sessions. */
 738  BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
 739 {
 740         return True;
 741 }
 742 #endif /* WITH_PAM */