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 /*
  63  *  Macros to help make life easy
  64  */
  65 #define COPY_STRING(s) (s) ? SMB_STRDUP(s) : NULL
  66 #define COPY_FSTRING(s) (s[0]) ? SMB_STRDUP(s) : NULL
  67
  68 /*******************************************************************
  69  PAM error handler.
  70  *********************************************************************/
  71
  72 static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
  73 {
  74
  75         if( pam_error != PAM_SUCCESS) {
  76                 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
  77                                 msg, pam_strerror(pamh, pam_error)));
  78                 return False;
  79         }
  80         return True;
  81 }
  82
  83 /*******************************************************************
  84  This function is a sanity check, to make sure that we NEVER report
  85  failure as sucess.
  86 *********************************************************************/
  87
  88 static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
  89                                             const char *msg, int dbglvl,
  90                                             NTSTATUS *nt_status)
  91 {
  92         *nt_status = pam_to_nt_status(pam_error);
  93
  94         if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
  95                 return True;
  96
  97         if (NT_STATUS_IS_OK(*nt_status)) {
  98                 /* Complain LOUDLY */
  99                 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
 100 error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
 101                 *nt_status = NT_STATUS_LOGON_FAILURE;
 102         }
 103         return False;
 104 }
 105
 106 /*
 107  * PAM conversation function
 108  * Here we assume (for now, at least) that echo on means login name, and
 109  * echo off means password.
 110  */
 111
 112 static int smb_pam_conv(int num_msg,
 113                     const struct pam_message **msg,
 114                     struct pam_response **resp,
 115                     void *appdata_ptr)
 116 {
 117         int replies = 0;
 118         struct pam_response *reply = NULL;
 119         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 120
 121         *resp = NULL;
 122
 123         if (num_msg <= 0)
 124                 return PAM_CONV_ERR;
 125
 126         /*
 127          * Apparantly HPUX has a buggy PAM that doesn't support the
 128          * appdata_ptr. Fail if this is the case. JRA.
 129          */
 130
 131         if (udp == NULL) {
 132                 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 133                 return PAM_CONV_ERR;
 134         }
 135
 136         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 137         if (!reply)
 138                 return PAM_CONV_ERR;
 139
 140         memset(reply, '\0', sizeof(struct pam_response) * num_msg);
 141
 142         for (replies = 0; replies < num_msg; replies++) {
 143                 switch (msg[replies]->msg_style) {
 144                         case PAM_PROMPT_ECHO_ON:
 145                                 reply[replies].resp_retcode = PAM_SUCCESS;
 146                                 reply[replies].resp = COPY_STRING(udp->PAM_username);
 147                                 /* PAM frees resp */
 148                                 break;
 149
 150                         case PAM_PROMPT_ECHO_OFF:
 151                                 reply[replies].resp_retcode = PAM_SUCCESS;
 152                                 reply[replies].resp = COPY_STRING(udp->PAM_password);
 153                                 /* PAM frees resp */
 154                                 break;
 155
 156                         case PAM_TEXT_INFO:
 157                                 /* fall through */
 158
 159                         case PAM_ERROR_MSG:
 160                                 /* ignore it... */
 161                                 reply[replies].resp_retcode = PAM_SUCCESS;
 162                                 reply[replies].resp = NULL;
 163                                 break;
 164
 165                         default:
 166                                 /* Must be an error of some sort... */
 167                                 SAFE_FREE(reply);
 168                                 return PAM_CONV_ERR;
 169                 }
 170         }
 171         if (reply)
 172                 *resp = reply;
 173         return PAM_SUCCESS;
 174 }
 175
 176 /*
 177  * PAM password change conversation function
 178  * Here we assume (for now, at least) that echo on means login name, and
 179  * echo off means password.
 180  */
 181
 182 static void special_char_sub(char *buf)
 183 {
 184         all_string_sub(buf, "\\n", "", 0);
 185         all_string_sub(buf, "\\r", "", 0);
 186         all_string_sub(buf, "\\s", " ", 0);
 187         all_string_sub(buf, "\\t", "\t", 0);
 188 }
 189
 190 static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
 191 {
 192         fstring_sub(buf, "%u", username);
 193         all_string_sub(buf, "%o", oldpass, sizeof(fstring));
 194         all_string_sub(buf, "%n", newpass, sizeof(fstring));
 195 }
 196
 197
 198 struct chat_struct {
 199         struct chat_struct *next, *prev;
 200         fstring prompt;
 201         fstring reply;
 202 };
 203
 204 /**************************************************************
 205  Create a linked list containing chat data.
 206 ***************************************************************/
 207
 208 static struct chat_struct *make_pw_chat(const char *p)
 209 {
 210         char *prompt;
 211         char *reply;
 212         struct chat_struct *list = NULL;
 213         struct chat_struct *t;
 214         TALLOC_CTX *frame = talloc_stackframe();
 215
 216         while (1) {
 217                 t = SMB_MALLOC_P(struct chat_struct);
 218                 if (!t) {
 219                         DEBUG(0,("make_pw_chat: malloc failed!\n"));
 220                         TALLOC_FREE(frame);
 221                         return NULL;
 222                 }
 223
 224                 ZERO_STRUCTP(t);
 225
 226                 DLIST_ADD_END(list, t, struct chat_struct*);
 227
 228                 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
 229                         break;
 230                 }
 231
 232                 if (strequal(prompt,".")) {
 233                         fstrcpy(prompt,"*");
 234                 }
 235
 236                 special_char_sub(prompt);
 237                 fstrcpy(t->prompt, prompt);
 238                 strlower_m(t->prompt);
 239                 trim_char(t->prompt, ' ', ' ');
 240
 241                 if (!next_token_talloc(frame, &p, &reply, NULL)) {
 242                         break;
 243                 }
 244
 245                 if (strequal(reply,".")) {
 246                         fstrcpy(reply,"");
 247                 }
 248
 249                 special_char_sub(reply);
 250                 fstrcpy(t->reply, reply);
 251                 strlower_m(t->reply);
 252                 trim_char(t->reply, ' ', ' ');
 253
 254         }
 255         TALLOC_FREE(frame);
 256         return list;
 257 }
 258
 259 static void free_pw_chat(struct chat_struct *list)
 260 {
 261     while (list) {
 262         struct chat_struct *old_head = list;
 263         DLIST_REMOVE(list, list);
 264         SAFE_FREE(old_head);
 265     }
 266 }
 267
 268 static int smb_pam_passchange_conv(int num_msg,
 269                                 const struct pam_message **msg,
 270                                 struct pam_response **resp,
 271                                 void *appdata_ptr)
 272 {
 273         int replies = 0;
 274         struct pam_response *reply = NULL;
 275         fstring current_prompt;
 276         fstring current_reply;
 277         struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
 278         struct chat_struct *pw_chat;
 279         struct chat_struct *t;
 280         bool found;
 281         *resp = NULL;
 282
 283         DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
 284
 285         if (num_msg <= 0)
 286                 return PAM_CONV_ERR;
 287
 288         if ((pw_chat = make_pw_chat(lp_passwd_chat())) == NULL)
 289                 return PAM_CONV_ERR;
 290
 291         /*
 292          * Apparantly HPUX has a buggy PAM that doesn't support the
 293          * appdata_ptr. Fail if this is the case. JRA.
 294          */
 295
 296         if (udp == NULL) {
 297                 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
 298                 free_pw_chat(pw_chat);
 299                 return PAM_CONV_ERR;
 300         }
 301
 302         reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
 303         if (!reply) {
 304                 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
 305                 free_pw_chat(pw_chat);
 306                 return PAM_CONV_ERR;
 307         }
 308
 309         for (replies = 0; replies < num_msg; replies++) {
 310                 found = False;
 311                 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
 312                 switch (msg[replies]->msg_style) {
 313                 case PAM_PROMPT_ECHO_ON:
 314                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 315                         fstrcpy(current_prompt, msg[replies]->msg);
 316                         trim_char(current_prompt, ' ', ' ');
 317                         for (t=pw_chat; t; t=t->next) {
 318
 319                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
 320                                                 t->prompt, current_prompt ));
 321
 322                                 if (unix_wild_match(t->prompt, current_prompt)) {
 323                                         fstrcpy(current_reply, t->reply);
 324                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
 325                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 326 #ifdef DEBUG_PASSWORD
 327                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
 328 #endif
 329                                         reply[replies].resp_retcode = PAM_SUCCESS;
 330                                         reply[replies].resp = COPY_FSTRING(current_reply);
 331                                         found = True;
 332                                         break;
 333                                 }
 334                         }
 335                         /* PAM frees resp */
 336                         if (!found) {
 337                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 338                                 free_pw_chat(pw_chat);
 339                                 SAFE_FREE(reply);
 340                                 return PAM_CONV_ERR;
 341                         }
 342                         break;
 343
 344                 case PAM_PROMPT_ECHO_OFF:
 345                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 346                         fstrcpy(current_prompt, msg[replies]->msg);
 347                         trim_char(current_prompt, ' ', ' ');
 348                         for (t=pw_chat; t; t=t->next) {
 349
 350                                 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
 351                                                 t->prompt, current_prompt ));
 352
 353                                 if (unix_wild_match(t->prompt, current_prompt)) {
 354                                         fstrcpy(current_reply, t->reply);
 355                                         DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
 356                                         pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
 357                                         reply[replies].resp_retcode = PAM_SUCCESS;
 358                                         reply[replies].resp = COPY_FSTRING(current_reply);
 359 #ifdef DEBUG_PASSWORD
 360                                         DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
 361 #endif
 362                                         found = True;
 363                                         break;
 364                                 }
 365                         }
 366                         /* PAM frees resp */
 367
 368                         if (!found) {
 369                                 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
 370                                 free_pw_chat(pw_chat);
 371                                 SAFE_FREE(reply);
 372                                 return PAM_CONV_ERR;
 373                         }
 374                         break;
 375
 376                 case PAM_TEXT_INFO:
 377                         /* fall through */
 378
 379                 case PAM_ERROR_MSG:
 380                         /* ignore it... */
 381                         reply[replies].resp_retcode = PAM_SUCCESS;
 382                         reply[replies].resp = NULL;
 383                         break;
 384
 385                 default:
 386                         /* Must be an error of some sort... */
 387                         free_pw_chat(pw_chat);
 388                         SAFE_FREE(reply);
 389                         return PAM_CONV_ERR;
 390                 }
 391         }
 392
 393         free_pw_chat(pw_chat);
 394         if (reply)
 395                 *resp = reply;
 396         return PAM_SUCCESS;
 397 }
 398
 399 /***************************************************************************
 400  Free up a malloced pam_conv struct.
 401 ****************************************************************************/
 402
 403 static void smb_free_pam_conv(struct pam_conv *pconv)
 404 {
 405         if (pconv)
 406                 SAFE_FREE(pconv->appdata_ptr);
 407
 408         SAFE_FREE(pconv);
 409 }
 410
 411 /***************************************************************************
 412  Allocate a pam_conv struct.
 413 ****************************************************************************/
 414
 415 static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
 416                                         const char *passwd, const char *newpass)
 417 {
 418         struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
 419         struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
 420
 421         if (pconv == NULL || udp == NULL) {
 422                 SAFE_FREE(pconv);
 423                 SAFE_FREE(udp);
 424                 return NULL;
 425         }
 426
 427         udp->PAM_username = user;
 428         udp->PAM_password = passwd;
 429         udp->PAM_newpassword = newpass;
 430
 431         pconv->conv = smb_pam_conv_fnptr;
 432         pconv->appdata_ptr = (void *)udp;
 433         return pconv;
 434 }
 435
 436 /*
 437  * PAM Closing out cleanup handler
 438  */
 439
 440 static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
 441 {
 442         int pam_error;
 443
 444         smb_free_pam_conv(smb_pam_conv_ptr);
 445
 446         if( pamh != NULL ) {
 447                 pam_error = pam_end(pamh, 0);
 448                 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
 449                         DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
 450                         return True;
 451                 }
 452         }
 453         DEBUG(2,("smb_pam_end: PAM: not initialised"));
 454         return False;
 455 }
 456
 457 /*
 458  * Start PAM authentication for specified account
 459  */
 460
 461 static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
 462 {
 463         int pam_error;
 464 #ifdef PAM_RHOST
 465         const char *our_rhost;
 466         char addr[INET6_ADDRSTRLEN];
 467 #endif
 468
 469         *pamh = (pam_handle_t *)NULL;
 470
 471         DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
 472
 473         pam_error = pam_start("samba", user, pconv, pamh);
 474         if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
 475                 *pamh = (pam_handle_t *)NULL;
 476                 return False;
 477         }
 478
 479 #ifdef PAM_RHOST
 480         if (rhost == NULL) {
 481                 our_rhost = client_name(smbd_server_fd());
 482                 if (strequal(our_rhost,"UNKNOWN"))
 483                         our_rhost = client_addr(smbd_server_fd(), addr,
 484                                                 sizeof(addr));
 485         } else {
 486                 our_rhost = rhost;
 487         }
 488
 489         DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
 490         pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
 491         if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
 492                 smb_pam_end(*pamh, pconv);
 493                 *pamh = (pam_handle_t *)NULL;
 494                 return False;
 495         }
 496 #endif
 497 #ifdef PAM_TTY
 498         DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
 499         pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
 500         if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
 501                 smb_pam_end(*pamh, pconv);
 502                 *pamh = (pam_handle_t *)NULL;
 503                 return False;
 504         }
 505 #endif
 506         DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
 507         return True;
 508 }
 509
 510 /*
 511  * PAM Authentication Handler
 512  */
 513 static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
 514 {
 515         int pam_error;
 516         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 517
 518         /*
 519          * To enable debugging set in /etc/pam.d/samba:
 520          *      auth required /lib/security/pam_pwdb.so nullok shadow audit
 521          */
 522
 523         DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
 524         pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
 525         switch( pam_error ){
 526                 case PAM_AUTH_ERR:
 527                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
 528                         break;
 529                 case PAM_CRED_INSUFFICIENT:
 530                         DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
 531                         break;
 532                 case PAM_AUTHINFO_UNAVAIL:
 533                         DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
 534                         break;
 535                 case PAM_USER_UNKNOWN:
 536                         DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
 537                         break;
 538                 case PAM_MAXTRIES:
 539                         DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
 540                         break;
 541                 case PAM_ABORT:
 542                         DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
 543                         break;
 544                 case PAM_SUCCESS:
 545                         DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
 546                         break;
 547                 default:
 548                         DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
 549                         break;
 550         }
 551
 552         smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
 553         return nt_status;
 554 }
 555
 556 /*
 557  * PAM Account Handler
 558  */
 559 static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
 560 {
 561         int pam_error;
 562         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 563
 564         DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
 565         pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
 566         switch( pam_error ) {
 567                 case PAM_AUTHTOK_EXPIRED:
 568                         DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
 569                         break;
 570                 case PAM_ACCT_EXPIRED:
 571                         DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
 572                         break;
 573                 case PAM_AUTH_ERR:
 574                         DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
 575                         break;
 576                 case PAM_PERM_DENIED:
 577                         DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
 578                         break;
 579                 case PAM_USER_UNKNOWN:
 580                         DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
 581                         break;
 582                 case PAM_SUCCESS:
 583                         DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
 584                         break;
 585                 default:
 586                         DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
 587                         break;
 588         }
 589
 590         smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
 591         return nt_status;
 592 }
 593
 594 /*
 595  * PAM Credential Setting
 596  */
 597
 598 static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
 599 {
 600         int pam_error;
 601         NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
 602
 603         /*
 604          * This will allow samba to aquire a kerberos token. And, when
 605          * exporting an AFS cell, be able to /write/ to this cell.
 606          */
 607
 608         DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
 609         pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
 610         switch( pam_error ) {
 611                 case PAM_CRED_UNAVAIL:
 612                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
 613                         break;
 614                 case PAM_CRED_EXPIRED:
 615                         DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
 616                         break;
 617                 case PAM_USER_UNKNOWN:
 618                         DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
 619                         break;
 620                 case PAM_CRED_ERR:
 621                         DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
 622                         break;
 623                 case PAM_SUCCESS:
 624                         DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
 625                         break;
 626                 default:
 627                         DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
 628                         break;
 629         }
 630
 631         smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
 632         return nt_status;
 633 }
 634
 635 /*
 636  * PAM Internal Session Handler
 637  */
 638 static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
 639 {
 640         int pam_error;
 641
 642 #ifdef PAM_TTY
 643         DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
 644         pam_error = pam_set_item(pamh, PAM_TTY, tty);
 645         if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
 646                 return False;
 647 #endif
 648
 649         if (flag) {
 650                 pam_error = pam_open_session(pamh, PAM_SILENT);
 651                 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
 652                         return False;
 653         } else {
 654                 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
 655                 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
 656                 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
 657                         return False;
 658         }
 659         return (True);
 660 }
 661
 662 /*
 663  * Internal PAM Password Changer.
 664  */
 665
 666 static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
 667 {
 668         int pam_error;
 669
 670         DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
 671
 672         pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
 673
 674         switch( pam_error ) {
 675         case PAM_AUTHTOK_ERR:
 676                 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
 677                 break;
 678
 679         /* This doesn't seem to be defined on Solaris. JRA */
 680 #ifdef PAM_AUTHTOK_RECOVER_ERR
 681         case PAM_AUTHTOK_RECOVER_ERR:
 682                 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
 683                 break;
 684 #endif
 685
 686         case PAM_AUTHTOK_LOCK_BUSY:
 687                 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
 688                 break;
 689         case PAM_AUTHTOK_DISABLE_AGING:
 690                 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
 691                 break;
 692         case PAM_PERM_DENIED:
 693                 DEBUG(0, ("PAM: Permission denied.\n"));
 694                 break;
 695         case PAM_TRY_AGAIN:
 696                 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
 697                 break;
 698         case PAM_USER_UNKNOWN:
 699                 DEBUG(0, ("PAM: User not known to PAM\n"));
 700                 break;
 701         case PAM_SUCCESS:
 702                 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
 703                 break;
 704         default:
 705                 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
 706         }
 707
 708         if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
 709                 return False;
 710         }
 711
 712         /* If this point is reached, the password has changed. */
 713         return True;
 714 }
 715
 716 /*
 717  * PAM Externally accessible Session handler
 718  */
 719
 720 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 721 {
 722         pam_handle_t *pamh = NULL;
 723         struct pam_conv *pconv = NULL;
 724
 725         /* Ignore PAM if told to. */
 726
 727         if (!lp_obey_pam_restrictions())
 728                 return True;
 729
 730         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 731                 return False;
 732
 733         if (!smb_pam_start(&pamh, user, rhost, pconv))
 734                 return False;
 735
 736         if (!smb_internal_pam_session(pamh, user, tty, True)) {
 737                 smb_pam_end(pamh, pconv);
 738                 return False;
 739         }
 740
 741         return smb_pam_end(pamh, pconv);
 742 }
 743
 744 /*
 745  * PAM Externally accessible Session handler
 746  */
 747
 748 bool smb_pam_close_session(char *user, char *tty, char *rhost)
 749 {
 750         pam_handle_t *pamh = NULL;
 751         struct pam_conv *pconv = NULL;
 752
 753         /* Ignore PAM if told to. */
 754
 755         if (!lp_obey_pam_restrictions())
 756                 return True;
 757
 758         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 759                 return False;
 760
 761         if (!smb_pam_start(&pamh, user, rhost, pconv))
 762                 return False;
 763
 764         if (!smb_internal_pam_session(pamh, user, tty, False)) {
 765                 smb_pam_end(pamh, pconv);
 766                 return False;
 767         }
 768
 769         return smb_pam_end(pamh, pconv);
 770 }
 771
 772 /*
 773  * PAM Externally accessible Account handler
 774  */
 775
 776 NTSTATUS smb_pam_accountcheck(const char * user)
 777 {
 778         NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
 779         pam_handle_t *pamh = NULL;
 780         struct pam_conv *pconv = NULL;
 781
 782         /* Ignore PAM if told to. */
 783
 784         if (!lp_obey_pam_restrictions())
 785                 return NT_STATUS_OK;
 786
 787         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
 788                 return NT_STATUS_NO_MEMORY;
 789
 790         if (!smb_pam_start(&pamh, user, NULL, pconv))
 791                 return NT_STATUS_ACCOUNT_DISABLED;
 792
 793         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
 794                 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
 795
 796         smb_pam_end(pamh, pconv);
 797         return nt_status;
 798 }
 799
 800 /*
 801  * PAM Password Validation Suite
 802  */
 803
 804 NTSTATUS smb_pam_passcheck(const char * user, const char * password)
 805 {
 806         pam_handle_t *pamh = NULL;
 807         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 808         struct pam_conv *pconv = NULL;
 809
 810         /*
 811          * Note we can't ignore PAM here as this is the only
 812          * way of doing auths on plaintext passwords when
 813          * compiled --with-pam.
 814          */
 815
 816         if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
 817                 return NT_STATUS_LOGON_FAILURE;
 818
 819         if (!smb_pam_start(&pamh, user, NULL, pconv))
 820                 return NT_STATUS_LOGON_FAILURE;
 821
 822         if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
 823                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
 824                 smb_pam_end(pamh, pconv);
 825                 return nt_status;
 826         }
 827
 828         if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
 829                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
 830                 smb_pam_end(pamh, pconv);
 831                 return nt_status;
 832         }
 833
 834         if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
 835                 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
 836                 smb_pam_end(pamh, pconv);
 837                 return nt_status;
 838         }
 839
 840         smb_pam_end(pamh, pconv);
 841         return nt_status;
 842 }
 843
 844 /*
 845  * PAM Password Change Suite
 846  */
 847
 848 bool smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
 849 {
 850         /* Appropriate quantities of root should be obtained BEFORE calling this function */
 851         struct pam_conv *pconv = NULL;
 852         pam_handle_t *pamh = NULL;
 853
 854         if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
 855                 return False;
 856
 857         if(!smb_pam_start(&pamh, user, NULL, pconv))
 858                 return False;
 859
 860         if (!smb_pam_chauthtok(pamh, user)) {
 861                 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
 862                 smb_pam_end(pamh, pconv);
 863                 return False;
 864         }
 865
 866         return smb_pam_end(pamh, pconv);
 867 }
 868
 869 #else
 870
 871 /* If PAM not used, no PAM restrictions on accounts. */
 872 NTSTATUS smb_pam_accountcheck(const char * user)
 873 {
 874         return NT_STATUS_OK;
 875 }
 876
 877 /* If PAM not used, also no PAM restrictions on sessions. */
 878 bool smb_pam_claim_session(char *user, char *tty, char *rhost)
 879 {
 880         return True;
 881 }
 882
 883 /* If PAM not used, also no PAM restrictions on sessions. */
 884 bool smb_pam_close_session(char *in_user, char *tty, char *rhost)
 885 {
 886         return True;
 887 }
 888 #endif /* WITH_PAM */