source/smbd/password.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Password and authentication handling
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25 extern int Protocol;
  26
  27 /* users from session setup */
  28 static pstring session_users="";
  29
  30 extern pstring scope;
  31 extern pstring global_myname;
  32 extern fstring global_myworkgroup;
  33
  34 /* Data to do lanman1/2 password challenge. */
  35 static unsigned char saved_challenge[8];
  36 static BOOL challenge_sent=False;
  37
  38 /*******************************************************************
  39 Get the next challenge value - no repeats.
  40 ********************************************************************/
  41 void generate_next_challenge(char *challenge)
  42 {
  43 #if 0
  44         /*
  45          * Leave this ifdef'd out while we test
  46          * the new crypto random number generator.
  47          * JRA.
  48          */
  49         unsigned char buf[16];
  50         static int counter = 0;
  51         struct timeval tval;
  52         int v1,v2;
  53
  54         /* get a sort-of random number */
  55         GetTimeOfDay(&tval);
  56         v1 = (counter++) + getpid() + tval.tv_sec;
  57         v2 = (counter++) * getpid() + tval.tv_usec;
  58         SIVAL(challenge,0,v1);
  59         SIVAL(challenge,4,v2);
  60
  61         /* mash it up with md4 */
  62         mdfour(buf, (unsigned char *)challenge, 8);
  63 #else
  64         unsigned char buf[8];
  65
  66         generate_random_buffer(buf,8,False);
  67 #endif
  68         memcpy(saved_challenge, buf, 8);
  69         memcpy(challenge,buf,8);
  70         challenge_sent = True;
  71 }
  72
  73 /*******************************************************************
  74 set the last challenge sent, usually from a password server
  75 ********************************************************************/
  76 BOOL set_challenge(unsigned char *challenge)
  77 {
  78   memcpy(saved_challenge,challenge,8);
  79   challenge_sent = True;
  80   return(True);
  81 }
  82
  83 /*******************************************************************
  84 get the last challenge sent
  85 ********************************************************************/
  86 static BOOL last_challenge(unsigned char *challenge)
  87 {
  88   if (!challenge_sent) return(False);
  89   memcpy(challenge,saved_challenge,8);
  90   return(True);
  91 }
  92
  93 /* this holds info on user ids that are already validated for this VC */
  94 static user_struct *validated_users = NULL;
  95 static int num_validated_users = 0;
  96
  97 /****************************************************************************
  98 check if a uid has been validated, and return an pointer to the user_struct
  99 if it has. NULL if not. vuid is biased by an offset. This allows us to
 100 tell random client vuid's (normally zero) from valid vuids.
 101 ****************************************************************************/
 102 user_struct *get_valid_user_struct(uint16 vuid)
 103 {
 104   if (vuid == UID_FIELD_INVALID)
 105     return NULL;
 106   vuid -= VUID_OFFSET;
 107   if ((vuid >= (uint16)num_validated_users) ||
 108      (validated_users[vuid].uid == (uid_t)-1) || (validated_users[vuid].gid == (gid_t)-1))
 109     return NULL;
 110   return &validated_users[vuid];
 111 }
 112
 113 /****************************************************************************
 114 invalidate a uid
 115 ****************************************************************************/
 116 void invalidate_vuid(uint16 vuid)
 117 {
 118   user_struct *vuser = get_valid_user_struct(vuid);
 119
 120   if (vuser == NULL) return;
 121
 122   vuser->uid = (uid_t)-1;
 123   vuser->gid = (gid_t)-1;
 124
 125   vuser->n_sids = 0;
 126
 127   /* same number of igroups as groups */
 128   vuser->n_groups = 0;
 129
 130   if (vuser->groups)
 131     free((char *)vuser->groups);
 132
 133   if (vuser->sids)
 134     free((char *)vuser->sids);
 135
 136   vuser->sids    = NULL;
 137   vuser->groups  = NULL;
 138 }
 139
 140
 141 /****************************************************************************
 142 return a validated username
 143 ****************************************************************************/
 144 char *validated_username(uint16 vuid)
 145 {
 146   user_struct *vuser = get_valid_user_struct(vuid);
 147   if (vuser == NULL)
 148     return 0;
 149   return(vuser->name);
 150 }
 151
 152
 153 /****************************************************************************
 154 Setup the groups a user belongs to.
 155 ****************************************************************************/
 156 int setup_groups(char *user, uid_t uid, gid_t gid, int *p_ngroups, gid_t **p_groups)
 157 {
 158         int i,ngroups;
 159         gid_t grp = 0;
 160         gid_t *groups = NULL;
 161
 162         if (-1 == initgroups(user,gid))
 163         {
 164                 if (getuid() == 0)
 165                 {
 166                         DEBUG(0,("Unable to initgroups!\n"));
 167                         if (gid < 0 || gid > 16000 || uid < 0 || uid > 16000)
 168                         {
 169                                 DEBUG(0,("This is probably a problem with the account %s\n", user));
 170                         }
 171                 }
 172                 return -1;
 173         }
 174
 175         ngroups = sys_getgroups(0,&grp);
 176         if (ngroups <= 0)
 177         {
 178                 ngroups = 32;
 179         }
 180
 181         if((groups = (gid_t *)malloc(sizeof(gid_t)*ngroups)) == NULL)
 182         {
 183                 DEBUG(0,("setup_groups malloc fail !\n"));
 184                 return -1;
 185         }
 186
 187         ngroups = sys_getgroups(ngroups,groups);
 188
 189         (*p_ngroups) = ngroups;
 190         (*p_groups) = groups;
 191
 192         DEBUG( 3, ( "%s is in %d groups: ", user, ngroups ) );
 193         for (i = 0; i < ngroups; i++ )
 194         {
 195                 DEBUG( 3, ( "%s%d", (i ? ", " : ""), (int)groups[i] ) );
 196         }
 197         DEBUG( 3, ( "\n" ) );
 198
 199         return 0;
 200 }
 201
 202
 203 /****************************************************************************
 204 register a uid/name pair as being valid and that a valid password
 205 has been given. vuid is biased by an offset. This allows us to
 206 tell random client vuid's (normally zero) from valid vuids.
 207 ****************************************************************************/
 208 uint16 register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name, BOOL guest)
 209 {
 210   user_struct *vuser;
 211   struct passwd *pwfile; /* for getting real name from passwd file */
 212
 213   /* Ensure no vuid gets registered in share level security. */
 214   if(lp_security() == SEC_SHARE)
 215     return UID_FIELD_INVALID;
 216
 217 #if 0
 218   /*
 219    * After observing MS-Exchange services writing to a Samba share
 220    * I belive this code is incorrect. Each service does its own
 221    * sessionsetup_and_X for the same user, and as each service shuts
 222    * down, it does a user_logoff_and_X. As we are consolidating multiple
 223    * sessionsetup_and_X's onto the same vuid here, when the first service
 224    * shuts down, it invalidates all the open files for the other services.
 225    * Hence I am removing this code and forcing each sessionsetup_and_X
 226    * to get a new vuid.
 227    * Jeremy Allison. (jallison@whistle.com).
 228    */
 229
 230   int i;
 231   for(i = 0; i < num_validated_users; i++) {
 232     vuser = &validated_users[i];
 233     if ( vuser->uid == uid )
 234       return (uint16)(i + VUID_OFFSET); /* User already validated */
 235   }
 236 #endif
 237
 238   validated_users = (user_struct *)Realloc(validated_users,
 239                            sizeof(user_struct)*
 240                            (num_validated_users+1));
 241
 242   if (!validated_users)
 243     {
 244       DEBUG(0,("Failed to realloc users struct!\n"));
 245       num_validated_users = 0;
 246       return UID_FIELD_INVALID;
 247     }
 248
 249   vuser = &validated_users[num_validated_users];
 250   num_validated_users++;
 251
 252   vuser->uid = uid;
 253   vuser->gid = gid;
 254   vuser->guest = guest;
 255   fstrcpy(vuser->name,unix_name);
 256   fstrcpy(vuser->requested_name,requested_name);
 257
 258   vuser->n_sids = 0;
 259   vuser->sids   = NULL;
 260
 261   vuser->n_groups = 0;
 262   vuser->groups  = NULL;
 263
 264   /* Find all the groups this uid is in and store them.
 265      Used by become_user() */
 266   setup_groups(unix_name,uid,gid,
 267                &vuser->n_groups,
 268                &vuser->groups);
 269
 270   DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name));
 271
 272   DEBUG(3, ("Clearing default real name\n"));
 273   fstrcpy(vuser->real_name, "<Full Name>\0");
 274   if (lp_unix_realname()) {
 275     if ((pwfile=getpwnam(vuser->name))!= NULL)
 276       {
 277       DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->name,pwfile->pw_gecos));
 278       fstrcpy(vuser->real_name, pwfile->pw_gecos);
 279       }
 280   }
 281
 282   return (uint16)((num_validated_users - 1) + VUID_OFFSET);
 283 }
 284
 285
 286 /****************************************************************************
 287 add a name to the session users list
 288 ****************************************************************************/
 289 void add_session_user(char *user)
 290 {
 291   fstring suser;
 292   StrnCpy(suser,user,sizeof(suser)-1);
 293
 294   if (!Get_Pwnam(suser,True)) return;
 295
 296   if (suser && *suser && !in_list(suser,session_users,False))
 297     {
 298       if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
 299         DEBUG(1,("Too many session users??\n"));
 300       else
 301         {
 302           pstrcat(session_users," ");
 303           pstrcat(session_users,suser);
 304         }
 305     }
 306 }
 307
 308
 309 /****************************************************************************
 310 update the encrypted smbpasswd file from the plaintext username and password
 311 *****************************************************************************/
 312 static BOOL update_smbpassword_file(char *user, char *password)
 313 {
 314         struct smb_passwd *smbpw;
 315         BOOL ret;
 316
 317         become_root(0);
 318         smbpw = getsmbpwnam(user);
 319         unbecome_root(0);
 320
 321         if(smbpw == NULL) {
 322                 DEBUG(0,("getsmbpwnam returned NULL\n"));
 323                 return False;
 324         }
 325
 326         /* Here, the flag is one, because we want to ignore the
 327            XXXXXXX'd out password */
 328         ret = change_oem_password( smbpw, password, True);
 329         if (ret == False) {
 330                 DEBUG(3,("change_oem_password returned False\n"));
 331         }
 332
 333         return ret;
 334 }
 335
 336
 337
 338
 339
 340 /****************************************************************************
 341 core of smb password checking routine.
 342 ****************************************************************************/
 343 BOOL smb_password_check(char *password, unsigned char *part_passwd, unsigned char *c8)
 344 {
 345   /* Finish the encryption of part_passwd. */
 346   unsigned char p21[21];
 347   unsigned char p24[24];
 348
 349   if (part_passwd == NULL)
 350     DEBUG(10,("No password set - allowing access\n"));
 351   /* No password set - always true ! */
 352   if (part_passwd == NULL)
 353     return 1;
 354
 355   memset(p21,'\0',21);
 356   memcpy(p21,part_passwd,16);
 357   E_P24(p21, c8, p24);
 358 #if DEBUG_PASSWORD
 359   {
 360     int i;
 361     DEBUG(100,("Part password (P16) was |"));
 362     for(i = 0; i < 16; i++)
 363       DEBUG(100,("%X ", (unsigned char)part_passwd[i]));
 364     DEBUG(100,("|\n"));
 365     DEBUG(100,("Password from client was |"));
 366     for(i = 0; i < 24; i++)
 367       DEBUG(100,("%X ", (unsigned char)password[i]));
 368     DEBUG(100,("|\n"));
 369     DEBUG(100,("Given challenge was |"));
 370     for(i = 0; i < 8; i++)
 371       DEBUG(100,("%X ", (unsigned char)c8[i]));
 372     DEBUG(100,("|\n"));
 373     DEBUG(100,("Value from encryption was |"));
 374     for(i = 0; i < 24; i++)
 375       DEBUG(100,("%X ", (unsigned char)p24[i]));
 376     DEBUG(100,("|\n"));
 377   }
 378 #endif
 379   return (memcmp(p24, password, 24) == 0);
 380 }
 381
 382 /****************************************************************************
 383  Do a specific test for an smb password being correct, given a smb_password and
 384  the lanman and NT responses.
 385 ****************************************************************************/
 386 BOOL smb_password_ok(struct smb_passwd *smb_pass, uchar chal[8],
 387                      uchar lm_pass[24], uchar nt_pass[24])
 388 {
 389         uchar challenge[8];
 390
 391         if (!lm_pass || !smb_pass) return(False);
 392
 393         DEBUG(4,("Checking SMB password for user %s\n",
 394                  smb_pass->smb_name));
 395
 396         if(smb_pass->acct_ctrl & ACB_DISABLED) {
 397                 DEBUG(3,("account for user %s was disabled.\n",
 398                          smb_pass->smb_name));
 399                 return(False);
 400         }
 401
 402         if (chal == NULL)
 403         {
 404                 DEBUG(5,("use last SMBnegprot challenge\n"));
 405                 if (!last_challenge(challenge))
 406                 {
 407                         DEBUG(1,("no challenge done - password failed\n"));
 408                         return False;
 409                 }
 410         }
 411         else
 412         {
 413                 DEBUG(5,("challenge received\n"));
 414                 memcpy(challenge, chal, 8);
 415         }
 416
 417         if ((Protocol >= PROTOCOL_NT1) && (smb_pass->smb_nt_passwd != NULL)) {
 418                 /* We have the NT MD4 hash challenge available - see if we can
 419                    use it (ie. does it exist in the smbpasswd file).
 420                 */
 421                 DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
 422                 if (smb_password_check((char *)nt_pass,
 423                                        (uchar *)smb_pass->smb_nt_passwd,
 424                                        challenge)) {
 425                         DEBUG(4,("NT MD4 password check succeeded\n"));
 426                         return(True);
 427                 }
 428                 DEBUG(4,("NT MD4 password check failed\n"));
 429         }
 430
 431         /* Try against the lanman password. smb_pass->smb_passwd == NULL means
 432            no password, allow access. */
 433
 434         DEBUG(4,("Checking LM MD4 password\n"));
 435
 436         if((smb_pass->smb_passwd == NULL) &&
 437            (smb_pass->acct_ctrl & ACB_PWNOTREQ)) {
 438                 DEBUG(4,("no password required for user %s\n",
 439                          smb_pass->smb_name));
 440                 return True;
 441         }
 442
 443         if((smb_pass->smb_passwd != NULL) &&
 444            smb_password_check((char *)lm_pass,
 445                               (uchar *)smb_pass->smb_passwd, challenge)) {
 446                 DEBUG(4,("LM MD4 password check succeeded\n"));
 447                 return(True);
 448         }
 449
 450         DEBUG(4,("LM MD4 password check failed\n"));
 451
 452         return False;
 453 }
 454
 455
 456 /****************************************************************************
 457 check if a username/password is OK assuming the password is a 24 byte
 458 SMB hash
 459 return True if the password is correct, False otherwise
 460 ****************************************************************************/
 461
 462 BOOL pass_check_smb(char *user, char *domain,
 463                 uchar *chal, uchar *lm_pwd, uchar *nt_pwd,
 464                 struct passwd *pwd)
 465 {
 466         struct passwd *pass;
 467         struct smb_passwd *smb_pass;
 468
 469         if (!lm_pwd || !nt_pwd)
 470         {
 471                 return(False);
 472         }
 473
 474         if (pwd != NULL && user == NULL)
 475         {
 476                 pass = (struct passwd *) pwd;
 477                 user = pass->pw_name;
 478         }
 479         else
 480         {
 481                 pass = Get_Pwnam(user,True);
 482         }
 483
 484         if (pass == NULL)
 485         {
 486                 DEBUG(3,("Couldn't find user %s\n",user));
 487                 return(False);
 488         }
 489
 490         smb_pass = getsmbpwnam(user);
 491
 492         if (smb_pass == NULL)
 493         {
 494                 DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user));
 495                 return(False);
 496         }
 497
 498         /* Quit if the account was disabled. */
 499         if(smb_pass->acct_ctrl & ACB_DISABLED) {
 500                 DEBUG(3,("account for user %s was disabled.\n", user));
 501                 return(False);
 502         }
 503
 504         /* Ensure the uid's match */
 505         if (smb_pass->smb_userid != pass->pw_uid)
 506         {
 507                 DEBUG(3,("Error : UNIX and SMB uids in password files do not match !\n"));
 508                 return(False);
 509         }
 510
 511         if (lm_pwd[0] == '\0' && IS_BITS_SET_ALL(smb_pass->acct_ctrl, ACB_PWNOTREQ) && lp_null_passwords())
 512         {
 513                 DEBUG(3,("account for user %s has no password and null passwords are allowed.\n", smb_pass->smb_name));
 514                 return(True);
 515         }
 516
 517         if (smb_password_ok(smb_pass, chal, lm_pwd, nt_pwd))
 518         {
 519                 return(True);
 520         }
 521
 522         DEBUG(3,("Error smb_password_check failed\n"));
 523         return False;
 524 }
 525
 526 /****************************************************************************
 527 check if a username/password pair is OK either via the system password
 528 database or the encrypted SMB password database
 529 return True if the password is correct, False otherwise
 530 ****************************************************************************/
 531 BOOL password_ok(char *user, char *password, int pwlen, struct passwd *pwd)
 532 {
 533         if (pwlen == 24 || (lp_encrypted_passwords() && (pwlen == 0) && lp_null_passwords()))
 534         {
 535                 /* if 24 bytes long assume it is an encrypted password */
 536                 uchar challenge[8];
 537
 538                 if (!last_challenge(challenge))
 539                 {
 540                         DEBUG(0,("Error: challenge not done for user=%s\n", user));
 541                         return False;
 542                 }
 543
 544                 return pass_check_smb(user, global_myworkgroup,
 545                                       challenge, (uchar *)password, (uchar *)password, pwd);
 546         }
 547
 548         return pass_check(user, password, pwlen, pwd,
 549                           lp_update_encrypted() ?
 550                           update_smbpassword_file : NULL);
 551 }
 552
 553 /****************************************************************************
 554 check if a username is valid
 555 ****************************************************************************/
 556 BOOL user_ok(char *user,int snum)
 557 {
 558         pstring valid, invalid;
 559         BOOL ret;
 560
 561         StrnCpy(valid, lp_valid_users(snum), sizeof(pstring));
 562         StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring));
 563
 564         string_sub(valid,"%S",lp_servicename(snum));
 565         string_sub(invalid,"%S",lp_servicename(snum));
 566
 567         ret = !user_in_list(user,invalid);
 568
 569         if (ret && valid && *valid) {
 570                 ret = user_in_list(user,valid);
 571         }
 572
 573         if (ret && lp_onlyuser(snum)) {
 574                 char *user_list = lp_username(snum);
 575                 string_sub(user_list,"%S",lp_servicename(snum));
 576                 ret = user_in_list(user,user_list);
 577         }
 578
 579         return(ret);
 580 }
 581
 582
 583
 584
 585 /****************************************************************************
 586 validate a group username entry. Return the username or NULL
 587 ****************************************************************************/
 588 static char *validate_group(char *group,char *password,int pwlen,int snum)
 589 {
 590 #ifdef HAVE_NETGROUP
 591   {
 592     char *host, *user, *domain;
 593     setnetgrent(group);
 594     while (getnetgrent(&host, &user, &domain)) {
 595       if (user) {
 596         if (user_ok(user, snum) &&
 597             password_ok(user,password,pwlen,NULL)) {
 598           endnetgrent();
 599           return(user);
 600         }
 601       }
 602     }
 603     endnetgrent();
 604   }
 605 #endif
 606
 607 #ifdef HAVE_GETGRNAM
 608   {
 609     struct group *gptr = (struct group *)getgrnam(group);
 610     char **member;
 611     if (gptr)
 612       {
 613         member = gptr->gr_mem;
 614         while (member && *member)
 615           {
 616             static fstring name;
 617             fstrcpy(name,*member);
 618             if (user_ok(name,snum) &&
 619                 password_ok(name,password,pwlen,NULL))
 620               return(&name[0]);
 621             member++;
 622           }
 623 #ifdef GROUP_CHECK_PWENT
 624         {
 625           struct passwd *pwd;
 626           static fstring tm;
 627
 628           setpwent ();
 629           while (pwd = getpwent ()) {
 630             if (*(pwd->pw_passwd) && pwd->pw_gid == gptr->gr_gid) {
 631               /* This Entry have PASSWORD and same GID then check pwd */
 632               if (password_ok(NULL, password, pwlen, pwd)) {
 633                 fstrcpy(tm, pwd->pw_name);
 634                 endpwent ();
 635                 return tm;
 636               }
 637             }
 638           }
 639           endpwent ();
 640         }
 641 #endif /* GROUP_CHECK_PWENT */
 642       }
 643   }
 644 #endif
 645   return(NULL);
 646 }
 647
 648
 649
 650 /****************************************************************************
 651 check for authority to login to a service with a given username/password
 652 ****************************************************************************/
 653 BOOL authorise_login(int snum,char *user,char *password, int pwlen,
 654                      BOOL *guest,BOOL *force,uint16 vuid)
 655 {
 656   BOOL ok = False;
 657
 658   *guest = False;
 659
 660 #if DEBUG_PASSWORD
 661   DEBUG(100,("checking authorisation on user=%s pass=%s\n",user,password));
 662 #endif
 663
 664   /* there are several possibilities:
 665      1) login as the given user with given password
 666      2) login as a previously registered username with the given password
 667      3) login as a session list username with the given password
 668      4) login as a previously validated user/password pair
 669      5) login as the "user =" user with given password
 670      6) login as the "user =" user with no password (guest connection)
 671      7) login as guest user with no password
 672
 673      if the service is guest_only then steps 1 to 5 are skipped
 674   */
 675
 676   if (GUEST_ONLY(snum)) *force = True;
 677
 678   if (!(GUEST_ONLY(snum) && GUEST_OK(snum)))
 679     {
 680
 681       user_struct *vuser = get_valid_user_struct(vuid);
 682
 683       /* check the given username and password */
 684       if (!ok && (*user) && user_ok(user,snum)) {
 685         ok = password_ok(user,password, pwlen, NULL);
 686         if (ok) DEBUG(3,("ACCEPTED: given username password ok\n"));
 687       }
 688
 689       /* check for a previously registered guest username */
 690       if (!ok && (vuser != 0) && vuser->guest) {
 691         if (user_ok(vuser->name,snum) &&
 692             password_ok(vuser->name, password, pwlen, NULL)) {
 693           fstrcpy(user, vuser->name);
 694           vuser->guest = False;
 695           DEBUG(3,("ACCEPTED: given password with registered user %s\n", user));
 696           ok = True;
 697         }
 698       }
 699
 700
 701       /* now check the list of session users */
 702     if (!ok)
 703     {
 704       char *auser;
 705       char *user_list = strdup(session_users);
 706       if (!user_list) return(False);
 707
 708       for (auser=strtok(user_list,LIST_SEP);
 709            !ok && auser;
 710            auser = strtok(NULL,LIST_SEP))
 711       {
 712         fstring user2;
 713         fstrcpy(user2,auser);
 714         if (!user_ok(user2,snum)) continue;
 715
 716         if (password_ok(user2,password, pwlen, NULL)) {
 717           ok = True;
 718           fstrcpy(user,user2);
 719           DEBUG(3,("ACCEPTED: session list username and given password ok\n"));
 720         }
 721       }
 722       free(user_list);
 723     }
 724
 725     /* check for a previously validated username/password pair */
 726     if (!ok && (!lp_revalidate(snum) || lp_security() > SEC_SHARE) &&
 727         (vuser != 0) && !vuser->guest &&
 728         user_ok(vuser->name,snum)) {
 729       fstrcpy(user,vuser->name);
 730       *guest = False;
 731       DEBUG(3,("ACCEPTED: validated uid ok as non-guest\n"));
 732       ok = True;
 733     }
 734
 735       /* check for a rhosts entry */
 736       if (!ok && user_ok(user,snum) && check_hosts_equiv(user)) {
 737         ok = True;
 738         DEBUG(3,("ACCEPTED: hosts equiv or rhosts entry\n"));
 739       }
 740
 741       /* check the user= fields and the given password */
 742       if (!ok && lp_username(snum)) {
 743         char *auser;
 744         pstring user_list;
 745         StrnCpy(user_list,lp_username(snum),sizeof(pstring));
 746
 747         string_sub(user_list,"%S",lp_servicename(snum));
 748
 749         for (auser=strtok(user_list,LIST_SEP);
 750              auser && !ok;
 751              auser = strtok(NULL,LIST_SEP))
 752           {
 753             if (*auser == '@')
 754               {
 755                 auser = validate_group(auser+1,password,pwlen,snum);
 756                 if (auser)
 757                   {
 758                     ok = True;
 759                     fstrcpy(user,auser);
 760                     DEBUG(3,("ACCEPTED: group username and given password ok\n"));
 761                   }
 762               }
 763             else
 764               {
 765                 fstring user2;
 766                 fstrcpy(user2,auser);
 767                 if (user_ok(user2,snum) &&
 768                     password_ok(user2,password,pwlen,NULL))
 769                   {
 770                     ok = True;
 771                     fstrcpy(user,user2);
 772                     DEBUG(3,("ACCEPTED: user list username and given password ok\n"));
 773                   }
 774               }
 775           }
 776       }
 777     } /* not guest only */
 778
 779   /* check for a normal guest connection */
 780   if (!ok && GUEST_OK(snum))
 781     {
 782       fstring guestname;
 783       StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1);
 784       if (Get_Pwnam(guestname,True))
 785         {
 786           fstrcpy(user,guestname);
 787           ok = True;
 788           DEBUG(3,("ACCEPTED: guest account and guest ok\n"));
 789         }
 790       else
 791         DEBUG(0,("Invalid guest account %s??\n",guestname));
 792       *guest = True;
 793       *force = True;
 794     }
 795
 796   if (ok && !user_ok(user,snum))
 797     {
 798       DEBUG(0,("rejected invalid user %s\n",user));
 799       ok = False;
 800     }
 801
 802   return(ok);
 803 }
 804
 805
 806 /****************************************************************************
 807 read the a hosts.equiv or .rhosts file and check if it
 808 allows this user from this machine
 809 ****************************************************************************/
 810 static BOOL check_user_equiv(char *user, char *remote, char *equiv_file)
 811 {
 812   pstring buf;
 813   int plus_allowed = 1;
 814   char *file_host;
 815   char *file_user;
 816   FILE *fp = sys_fopen(equiv_file, "r");
 817   DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file));
 818   if (! fp) return False;
 819   while(fgets(buf, sizeof(buf), fp))
 820   {
 821     trim_string(buf," "," ");
 822
 823     if (buf[0] != '#' && buf[0] != '\n')
 824     {
 825       BOOL is_group = False;
 826       int plus = 1;
 827       char *bp = buf;
 828       if (strcmp(buf, "NO_PLUS\n") == 0)
 829       {
 830         DEBUG(6, ("check_user_equiv NO_PLUS\n"));
 831         plus_allowed = 0;
 832       }
 833       else {
 834         if (buf[0] == '+')
 835         {
 836           bp++;
 837           if (*bp == '\n' && plus_allowed)
 838           {
 839             /* a bare plus means everbody allowed */
 840             DEBUG(6, ("check_user_equiv everybody allowed\n"));
 841             fclose(fp);
 842             return True;
 843           }
 844         }
 845         else if (buf[0] == '-')
 846         {
 847           bp++;
 848           plus = 0;
 849         }
 850         if (*bp == '@')
 851         {
 852           is_group = True;
 853           bp++;
 854         }
 855         file_host = strtok(bp, " \t\n");
 856         file_user = strtok(NULL, " \t\n");
 857         DEBUG(7, ("check_user_equiv %s %s\n", file_host ? file_host : "(null)",
 858                  file_user ? file_user : "(null)" ));
 859         if (file_host && *file_host)
 860         {
 861           BOOL host_ok = False;
 862
 863 #if defined(HAVE_NETGROUP) && defined(HAVE_YP_GET_DEFAULT_DOMAIN)
 864           if (is_group)
 865             {
 866               static char *mydomain = NULL;
 867               if (!mydomain)
 868                 yp_get_default_domain(&mydomain);
 869               if (mydomain && innetgr(file_host,remote,user,mydomain))
 870                 host_ok = True;
 871             }
 872 #else
 873           if (is_group)
 874             {
 875               DEBUG(1,("Netgroups not configured\n"));
 876               continue;
 877             }
 878 #endif
 879
 880           /* is it this host */
 881           /* the fact that remote has come from a call of gethostbyaddr
 882            * means that it may have the fully qualified domain name
 883            * so we could look up the file version to get it into
 884            * a canonical form, but I would rather just type it
 885            * in full in the equiv file
 886            */
 887           if (!host_ok && !is_group && strequal(remote, file_host))
 888             host_ok = True;
 889
 890           if (!host_ok)
 891             continue;
 892
 893           /* is it this user */
 894           if (file_user == 0 || strequal(user, file_user))
 895             {
 896               fclose(fp);
 897               DEBUG(5, ("check_user_equiv matched %s%s %s\n",
 898                         (plus ? "+" : "-"), file_host,
 899                         (file_user ? file_user : "")));
 900               return (plus ? True : False);
 901             }
 902         }
 903       }
 904     }
 905   }
 906   fclose(fp);
 907   return False;
 908 }
 909
 910
 911 /****************************************************************************
 912 check for a possible hosts equiv or rhosts entry for the user
 913 ****************************************************************************/
 914 BOOL check_hosts_equiv(char *user)
 915 {
 916   char *fname = NULL;
 917   pstring rhostsfile;
 918   struct passwd *pass = Get_Pwnam(user,True);
 919
 920   if (!pass)
 921     return(False);
 922
 923   fname = lp_hosts_equiv();
 924
 925   /* note: don't allow hosts.equiv on root */
 926   if (fname && *fname && (pass->pw_uid != 0)) {
 927           extern int Client;
 928           if (check_user_equiv(user,client_name(Client),fname))
 929                   return(True);
 930   }
 931
 932   if (lp_use_rhosts())
 933     {
 934       char *home = get_home_dir(user);
 935       if (home) {
 936               extern int Client;
 937               slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home);
 938               if (check_user_equiv(user,client_name(Client),rhostsfile))
 939                       return(True);
 940       }
 941     }
 942
 943   return(False);
 944 }
 945
 946
 947 /****************************************************************************
 948 return the client state structure
 949 ****************************************************************************/
 950 struct cli_state *server_client(void)
 951 {
 952         static struct cli_state pw_cli;
 953         return &pw_cli;
 954 }
 955
 956 /****************************************************************************
 957 support for server level security
 958 ****************************************************************************/
 959 struct cli_state *server_cryptkey(void)
 960 {
 961         struct cli_state *cli;
 962         fstring desthost;
 963         struct in_addr dest_ip;
 964         extern fstring local_machine;
 965         char *p;
 966         BOOL connected_ok = False;
 967         struct nmb_name calling, called;
 968
 969         cli = server_client();
 970
 971         if (!cli_initialise(cli))
 972                 return NULL;
 973
 974         p = lp_passwordserver();
 975         while(p && next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
 976                 standard_sub_basic(desthost);
 977                 strupper(desthost);
 978
 979                 if(!resolve_name( desthost, &dest_ip, 0x20)) {
 980                         DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
 981                         continue;
 982                 }
 983
 984                 if (ismyip(dest_ip)) {
 985                         DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
 986                         continue;
 987                 }
 988
 989                 if (cli_connect(cli, desthost, &dest_ip)) {
 990                         DEBUG(3,("connected to password server %s\n",desthost));
 991                         connected_ok = True;
 992                         break;
 993                 }
 994         }
 995
 996         if (!connected_ok) {
 997                 DEBUG(0,("password server not available\n"));
 998                 cli_shutdown(cli);
 999                 return NULL;
1000         }
1001
1002         make_nmb_name(&calling, local_machine, 0x0 , scope);
1003     make_nmb_name(&called , desthost     , 0x20, scope);
1004
1005     if (!cli_session_request(cli, &calling, &called)) {
1006         /* try with *SMBSERVER if the first name fails */
1007         cli_shutdown(cli);
1008         make_nmb_name(&called , "*SMBSERVER", 0x20, scope);
1009         if (!cli_initialise(cli) ||
1010             !cli_connect(cli, desthost, &dest_ip) ||
1011             !cli_session_request(cli, &calling, &called)) {
1012             DEBUG(1,("%s rejected the session\n",desthost));
1013             cli_shutdown(cli);
1014             return NULL;
1015         }
1016     }
1017
1018         DEBUG(3,("got session\n"));
1019
1020         if (!cli_negprot(cli)) {
1021                 DEBUG(1,("%s rejected the negprot\n",desthost));
1022                 cli_shutdown(cli);
1023                 return NULL;
1024         }
1025
1026         if (cli->protocol < PROTOCOL_LANMAN2 ||
1027             !(cli->sec_mode & 1)) {
1028                 DEBUG(1,("%s isn't in user level security mode\n",desthost));
1029                 cli_shutdown(cli);
1030                 return NULL;
1031         }
1032
1033         DEBUG(3,("password server OK\n"));
1034
1035         return cli;
1036 }
1037
1038 /****************************************************************************
1039 validate a password with the password server
1040 ****************************************************************************/
1041 BOOL server_validate(char *user, char *domain,
1042                      char *pass, int passlen,
1043                      char *ntpass, int ntpasslen)
1044 {
1045   struct cli_state *cli;
1046   static unsigned char badpass[24];
1047   static BOOL tested_password_server = False;
1048   static BOOL bad_password_server = False;
1049
1050   cli = server_client();
1051
1052   if (!cli->initialised) {
1053     DEBUG(1,("password server %s is not connected\n", cli->desthost));
1054     return(False);
1055   }
1056
1057   if(badpass[0] == 0)
1058     memset(badpass, 0x1f, sizeof(badpass));
1059
1060   if((passlen == sizeof(badpass)) && !memcmp(badpass, pass, passlen)) {
1061     /*
1062      * Very unlikely, our random bad password is the same as the users
1063      * password. */
1064     memset(badpass, badpass[0]+1, sizeof(badpass));
1065   }
1066
1067   /*
1068    * Attempt a session setup with a totally incorrect password.
1069    * If this succeeds with the guest bit *NOT* set then the password
1070    * server is broken and is not correctly setting the guest bit. We
1071    * need to detect this as some versions of NT4.x are broken. JRA.
1072    */
1073
1074   if(!tested_password_server) {
1075     if (cli_session_setup(cli, user, (char *)badpass, sizeof(badpass),
1076                               (char *)badpass, sizeof(badpass), domain)) {
1077
1078       /*
1079        * We connected to the password server so we
1080        * can say we've tested it.
1081        */
1082       tested_password_server = True;
1083
1084       if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
1085         DEBUG(0,("server_validate: password server %s allows users as non-guest \
1086 with a bad password.\n", cli->desthost));
1087         DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
1088 use this machine as the password server.\n"));
1089         cli_ulogoff(cli);
1090
1091         /*
1092          * Password server has the bug.
1093          */
1094         bad_password_server = True;
1095         return False;
1096       }
1097       cli_ulogoff(cli);
1098     }
1099   } else {
1100
1101     /*
1102      * We have already tested the password server.
1103      * Fail immediately if it has the bug.
1104      */
1105
1106     if(bad_password_server) {
1107       DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
1108 with a bad password.\n", cli->desthost));
1109       DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
1110 use this machine as the password server.\n"));
1111       return False;
1112     }
1113   }
1114
1115   /*
1116    * Now we know the password server will correctly set the guest bit, or is
1117    * not guest enabled, we can try with the real password.
1118    */
1119
1120   if (!cli_session_setup(cli, user, pass, passlen, ntpass, ntpasslen, domain)) {
1121     DEBUG(1,("password server %s rejected the password\n", cli->desthost));
1122     return False;
1123   }
1124
1125   /* if logged in as guest then reject */
1126   if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
1127     DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
1128     cli_ulogoff(cli);
1129     return(False);
1130   }
1131
1132
1133   cli_ulogoff(cli);
1134
1135   return(True);
1136 }
1137
1138 /***********************************************************************
1139  Do the same as security=server, but using NT Domain calls and a session
1140  key from the machine password.
1141 ************************************************************************/
1142
1143 BOOL domain_client_validate( char *user, char *domain,
1144                              char *smb_apasswd, int smb_apasslen,
1145                              char *smb_ntpasswd, int smb_ntpasslen,
1146                              BOOL *user_exists)
1147 {
1148   unsigned char local_challenge[8];
1149   unsigned char local_lm_response[24];
1150   unsigned char local_nt_reponse[24];
1151   unsigned char trust_passwd[16];
1152   fstring remote_machine;
1153   char *p;
1154   struct in_addr dest_ip;
1155   NET_ID_INFO_CTR ctr;
1156   NET_USER_INFO_3 info3;
1157   struct cli_state cli;
1158   uint32 smb_uid_low;
1159   BOOL connected_ok = False;
1160   struct nmb_name calling, called;
1161
1162   if(user_exists != NULL)
1163     *user_exists = True; /* Only set false on a very specific error. */
1164
1165   /*
1166    * Check that the requested domain is not our own machine name.
1167    * If it is, we should never check the PDC here, we use our own local
1168    * password file.
1169    */
1170
1171   if(strequal( domain, global_myname)) {
1172     DEBUG(3,("domain_client_validate: Requested domain was for this machine.\n"));
1173     return False;
1174   }
1175
1176   /*
1177    * Next, check that the passwords given were encrypted.
1178    */
1179
1180   if(((smb_apasslen != 24) && (smb_apasslen != 0)) ||
1181      ((smb_ntpasslen != 24) && (smb_ntpasslen != 0))) {
1182
1183     /*
1184      * Not encrypted - do so.
1185      */
1186
1187     DEBUG(3,("domain_client_validate: User passwords not in encrypted format.\n"));
1188     generate_random_buffer( local_challenge, 8, False);
1189     SMBencrypt( (uchar *)smb_apasswd, local_challenge, local_lm_response);
1190     SMBNTencrypt((uchar *)smb_ntpasswd, local_challenge, local_nt_reponse);
1191     smb_apasslen = 24;
1192     smb_ntpasslen = 24;
1193     smb_apasswd = (char *)local_lm_response;
1194     smb_ntpasswd = (char *)local_nt_reponse;
1195   } else {
1196
1197     /*
1198      * Encrypted - get the challenge we sent for these
1199      * responses.
1200      */
1201
1202     if (!last_challenge(local_challenge)) {
1203       DEBUG(0,("domain_client_validate: no challenge done - password failed\n"));
1204       return False;
1205     }
1206   }
1207
1208   /*
1209    * Get the machine account password.
1210    */
1211   if (!trust_get_passwd( trust_passwd, global_myworkgroup, global_myname))
1212   {
1213     return False;
1214   }
1215
1216   /*
1217    * At this point, smb_apasswd points to the lanman response to
1218    * the challenge in local_challenge, and smb_ntpasswd points to
1219    * the NT response to the challenge in local_challenge. Ship
1220    * these over the secure channel to a domain controller and
1221    * see if they were valid.
1222    */
1223
1224   ZERO_STRUCT(cli);
1225
1226   if(cli_initialise(&cli) == False) {
1227     DEBUG(0,("domain_client_validate: unable to initialize client connection.\n"));
1228     return False;
1229   }
1230
1231   /*
1232    * Treat each name in the 'password server =' line as a potential
1233    * PDC/BDC. Contact each in turn and try and authenticate.
1234    */
1235
1236   p = lp_passwordserver();
1237   while(p && next_token(&p,remote_machine,LIST_SEP,sizeof(remote_machine))) {
1238
1239     standard_sub_basic(remote_machine);
1240     strupper(remote_machine);
1241
1242     if(!resolve_name( remote_machine, &dest_ip, 0x20)) {
1243       DEBUG(1,("domain_client_validate: Can't resolve address for %s\n", remote_machine));
1244       continue;
1245     }
1246
1247     if (ismyip(dest_ip)) {
1248       DEBUG(1,("domain_client_validate: Password server loop - not using password server %s\n",remote_machine));
1249       continue;
1250     }
1251
1252     if (!cli_connect(&cli, remote_machine, &dest_ip)) {
1253       DEBUG(0,("domain_client_validate: unable to connect to SMB server on \
1254 machine %s. Error was : %s.\n", remote_machine, cli_errstr(&cli) ));
1255       continue;
1256     }
1257
1258         make_nmb_name(&calling, global_myname , 0x0 , scope);
1259         make_nmb_name(&called , remote_machine, 0x20, scope);
1260
1261         if (!cli_session_request(&cli, &calling, &called))
1262         {
1263       DEBUG(0,("domain_client_validate: machine %s rejected the session setup. \
1264 Error was : %s.\n", remote_machine, cli_errstr(&cli) ));
1265       cli_shutdown(&cli);
1266       continue;
1267     }
1268
1269     cli.protocol = PROTOCOL_NT1;
1270
1271     if (!cli_negprot(&cli)) {
1272       DEBUG(0,("domain_client_validate: machine %s rejected the negotiate protocol. \
1273 Error was : %s.\n", remote_machine, cli_errstr(&cli) ));
1274       cli_shutdown(&cli);
1275       continue;
1276     }
1277
1278     if (cli.protocol != PROTOCOL_NT1) {
1279       DEBUG(0,("domain_client_validate: machine %s didn't negotiate NT protocol.\n",
1280                      remote_machine));
1281       cli_shutdown(&cli);
1282       continue;
1283     }
1284
1285     /*
1286      * Do an anonymous session setup.
1287      */
1288
1289     if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
1290       DEBUG(0,("domain_client_validate: machine %s rejected the session setup. \
1291 Error was : %s.\n", remote_machine, cli_errstr(&cli) ));
1292       cli_shutdown(&cli);
1293       continue;
1294     }
1295
1296     if (!(cli.sec_mode & 1)) {
1297       DEBUG(1,("domain_client_validate: machine %s isn't in user level security mode\n",
1298                  remote_machine));
1299       cli_shutdown(&cli);
1300       continue;
1301     }
1302
1303     if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
1304       DEBUG(0,("domain_client_validate: machine %s rejected the tconX on the IPC$ share. \
1305 Error was : %s.\n", remote_machine, cli_errstr(&cli) ));
1306       cli_shutdown(&cli);
1307       continue;
1308     }
1309
1310     /*
1311      * We have an anonymous connection to IPC$.
1312      */
1313     connected_ok = True;
1314     break;
1315   }
1316
1317   if (!connected_ok) {
1318     DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
1319     cli_shutdown(&cli);
1320     return False;
1321   }
1322
1323   /*
1324    * Ok - we have an anonymous connection to the IPC$ share.
1325    * Now start the NT Domain stuff :-).
1326    */
1327
1328   if(cli_nt_session_open(&cli, PIPE_NETLOGON) == False) {
1329     DEBUG(0,("domain_client_validate: unable to open the domain client session to \
1330 machine %s. Error was : %s.\n", remote_machine, cli_errstr(&cli)));
1331     cli_nt_session_close(&cli);
1332     cli_ulogoff(&cli);
1333     cli_shutdown(&cli);
1334     return False;
1335   }
1336
1337   if(cli_nt_setup_creds(&cli, trust_passwd) == False) {
1338     DEBUG(0,("domain_client_validate: unable to setup the PDC credentials to machine \
1339 %s. Error was : %s.\n", remote_machine, cli_errstr(&cli)));
1340     cli_nt_session_close(&cli);
1341     cli_ulogoff(&cli);
1342     cli_shutdown(&cli);
1343     return False;
1344   }
1345
1346   /* We really don't care what LUID we give the user. */
1347   generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);
1348
1349   if(cli_nt_login_network(&cli, domain, user, smb_uid_low, (char *)local_challenge,
1350                           ((smb_apasslen != 0) ? smb_apasswd : NULL),
1351                           ((smb_ntpasslen != 0) ? smb_ntpasswd : NULL),
1352                           &ctr, &info3) == False) {
1353     uint32 nt_rpc_err;
1354
1355     cli_error(&cli, NULL, NULL, &nt_rpc_err);
1356     DEBUG(0,("domain_client_validate: unable to validate password for user %s in domain \
1357 %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));
1358     cli_nt_session_close(&cli);
1359     cli_ulogoff(&cli);
1360     cli_shutdown(&cli);
1361
1362     if((nt_rpc_err == NT_STATUS_NO_SUCH_USER) && (user_exists != NULL))
1363       *user_exists = False;
1364
1365     return False;
1366   }
1367
1368   /*
1369    * Here, if we really want it, we have lots of info about the user in info3.
1370    */
1371
1372 #if 0
1373   /*
1374    * We don't actually need to do this - plus it fails currently with
1375    * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
1376    * send here. JRA.
1377    */
1378
1379   if(cli_nt_logoff(&cli, &ctr) == False) {
1380     DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
1381 %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));
1382     cli_nt_session_close(&cli);
1383     cli_ulogoff(&cli);
1384     cli_shutdown(&cli);
1385     return False;
1386   }
1387 #endif /* 0 */
1388
1389   cli_nt_session_close(&cli);
1390   cli_ulogoff(&cli);
1391   cli_shutdown(&cli);
1392   return True;
1393 }