source/smbd/negprot.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    negprot reply code
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 extern int Protocol;
  24 extern int max_recv;
  25 BOOL global_encrypted_passwords_negotiated = False;
  26 BOOL global_spnego_negotiated = False;
  27 struct auth_context *negprot_global_auth_context = NULL;
  28
  29 static void get_challenge(char buff[8])
  30 {
  31         NTSTATUS nt_status;
  32         const uint8 *cryptkey;
  33
  34         /* We might be called more than once, muliple negprots are premitted */
  35         if (negprot_global_auth_context) {
  36                 DEBUG(3, ("get challenge: is this a secondary negprot?  negprot_global_auth_context is non-NULL!\n"));
  37                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
  38         }
  39
  40         DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
  41         if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&negprot_global_auth_context))) {
  42                 DEBUG(0, ("make_auth_context_subsystem returned %s", nt_errstr(nt_status)));
  43                 smb_panic("cannot make_negprot_global_auth_context!\n");
  44         }
  45         DEBUG(10, ("get challenge: getting challenge\n"));
  46         cryptkey = negprot_global_auth_context->get_ntlm_challenge(negprot_global_auth_context);
  47         memcpy(buff, cryptkey, 8);
  48 }
  49
  50 /****************************************************************************
  51  Reply for the core protocol.
  52 ****************************************************************************/
  53
  54 static int reply_corep(char *inbuf, char *outbuf)
  55 {
  56         int outsize = set_message(outbuf,1,0,True);
  57
  58         Protocol = PROTOCOL_CORE;
  59
  60         return outsize;
  61 }
  62
  63 /****************************************************************************
  64  Reply for the coreplus protocol.
  65 ****************************************************************************/
  66
  67 static int reply_coreplus(char *inbuf, char *outbuf)
  68 {
  69         int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
  70         int outsize = set_message(outbuf,13,0,True);
  71         SSVAL(outbuf,smb_vwv5,raw); /* tell redirector we support
  72                         readbraw and writebraw (possibly) */
  73         /* Reply, SMBlockread, SMBwritelock supported. */
  74         SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
  75         SSVAL(outbuf,smb_vwv1,0x1); /* user level security, don't encrypt */
  76
  77         Protocol = PROTOCOL_COREPLUS;
  78
  79         return outsize;
  80 }
  81
  82 /****************************************************************************
  83  Reply for the lanman 1.0 protocol.
  84 ****************************************************************************/
  85
  86 static int reply_lanman1(char *inbuf, char *outbuf)
  87 {
  88         int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
  89         int secword=0;
  90         time_t t = time(NULL);
  91
  92         global_encrypted_passwords_negotiated = lp_encrypted_passwords();
  93
  94         if (lp_security()>=SEC_USER)
  95                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
  96         if (global_encrypted_passwords_negotiated)
  97                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
  98
  99         set_message(outbuf,13,global_encrypted_passwords_negotiated?8:0,True);
 100         SSVAL(outbuf,smb_vwv1,secword);
 101         /* Create a token value and add it to the outgoing packet. */
 102         if (global_encrypted_passwords_negotiated) {
 103                 get_challenge(smb_buf(outbuf));
 104                 SSVAL(outbuf,smb_vwv11, 8);
 105         }
 106
 107         Protocol = PROTOCOL_LANMAN1;
 108
 109         /* Reply, SMBlockread, SMBwritelock supported. */
 110         SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
 111         SSVAL(outbuf,smb_vwv2,max_recv);
 112         SSVAL(outbuf,smb_vwv3,lp_maxmux()); /* maxmux */
 113         SSVAL(outbuf,smb_vwv4,1);
 114         SSVAL(outbuf,smb_vwv5,raw); /* tell redirector we support
 115                 readbraw writebraw (possibly) */
 116         SIVAL(outbuf,smb_vwv6,sys_getpid());
 117         SSVAL(outbuf,smb_vwv10, TimeDiff(t)/60);
 118
 119         put_dos_date(outbuf,smb_vwv8,t);
 120
 121         return (smb_len(outbuf)+4);
 122 }
 123
 124 /****************************************************************************
 125  Reply for the lanman 2.0 protocol.
 126 ****************************************************************************/
 127
 128 static int reply_lanman2(char *inbuf, char *outbuf)
 129 {
 130         int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
 131         int secword=0;
 132         time_t t = time(NULL);
 133
 134         global_encrypted_passwords_negotiated = lp_encrypted_passwords();
 135
 136         if (lp_security()>=SEC_USER)
 137                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 138         if (global_encrypted_passwords_negotiated)
 139                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 140
 141         set_message(outbuf,13,global_encrypted_passwords_negotiated?8:0,True);
 142         SSVAL(outbuf,smb_vwv1,secword);
 143         SIVAL(outbuf,smb_vwv6,sys_getpid());
 144
 145         /* Create a token value and add it to the outgoing packet. */
 146         if (global_encrypted_passwords_negotiated) {
 147                 get_challenge(smb_buf(outbuf));
 148                 SSVAL(outbuf,smb_vwv11, 8);
 149         }
 150
 151         Protocol = PROTOCOL_LANMAN2;
 152
 153         /* Reply, SMBlockread, SMBwritelock supported. */
 154         SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
 155         SSVAL(outbuf,smb_vwv2,max_recv);
 156         SSVAL(outbuf,smb_vwv3,lp_maxmux());
 157         SSVAL(outbuf,smb_vwv4,1);
 158         SSVAL(outbuf,smb_vwv5,raw); /* readbraw and/or writebraw */
 159         SSVAL(outbuf,smb_vwv10, TimeDiff(t)/60);
 160         put_dos_date(outbuf,smb_vwv8,t);
 161
 162         return (smb_len(outbuf)+4);
 163 }
 164
 165 /****************************************************************************
 166  Generate the spnego negprot reply blob. Return the number of bytes used.
 167 ****************************************************************************/
 168
 169 static int negprot_spnego(char *p)
 170 {
 171         DATA_BLOB blob;
 172         nstring dos_name;
 173         fstring unix_name;
 174         uint8 guid[17];
 175         const char *OIDs_krb5[] = {OID_KERBEROS5,
 176                                    OID_KERBEROS5_OLD,
 177                                    OID_NTLMSSP,
 178                                    NULL};
 179         const char *OIDs_plain[] = {OID_NTLMSSP, NULL};
 180         char *principal;
 181         int len;
 182
 183         global_spnego_negotiated = True;
 184
 185         ZERO_STRUCT(guid);
 186
 187         safe_strcpy(unix_name, global_myname(), sizeof(unix_name)-1);
 188         strlower_m(unix_name);
 189         push_ascii_nstring(dos_name, unix_name);
 190         safe_strcpy((char *)guid, dos_name, sizeof(guid)-1);
 191
 192 #ifdef DEVELOPER
 193         /* valgrind fixer... */
 194         {
 195                 size_t sl = strlen(guid);
 196                 if (sizeof(guid)-sl)
 197                         memset(&guid[sl], '\0', sizeof(guid)-sl);
 198         }
 199 #endif
 200
 201 #if 0
 202         /* strangely enough, NT does not sent the single OID NTLMSSP when
 203            not a ADS member, it sends no OIDs at all
 204
 205            we can't do this until we teach our sesssion setup parser to know
 206            about raw NTLMSSP (clients send no ASN.1 wrapping if we do this)
 207         */
 208         if (lp_security() != SEC_ADS) {
 209                 memcpy(p, guid, 16);
 210                 return 16;
 211         }
 212 #endif
 213         if (lp_security() != SEC_ADS) {
 214                 blob = spnego_gen_negTokenInit(guid, OIDs_plain, "NONE");
 215         } else {
 216                 asprintf(&principal, "%s$@%s", guid, lp_realm());
 217                 blob = spnego_gen_negTokenInit(guid, OIDs_krb5, principal);
 218                 free(principal);
 219         }
 220         memcpy(p, blob.data, blob.length);
 221         len = blob.length;
 222         data_blob_free(&blob);
 223         return len;
 224 }
 225
 226 /****************************************************************************
 227  Reply for the nt protocol.
 228 ****************************************************************************/
 229
 230 static int reply_nt1(char *inbuf, char *outbuf)
 231 {
 232         /* dual names + lock_and_read + nt SMBs + remote API calls */
 233         int capabilities = CAP_NT_FIND|CAP_LOCK_AND_READ|
 234                 CAP_LEVEL_II_OPLOCKS;
 235
 236         int secword=0;
 237         time_t t = time(NULL);
 238         char *p, *q;
 239         BOOL negotiate_spnego = False;
 240
 241         global_encrypted_passwords_negotiated = lp_encrypted_passwords();
 242
 243         /* do spnego in user level security if the client
 244            supports it and we can do encrypted passwords */
 245
 246         if (global_encrypted_passwords_negotiated &&
 247             (lp_security() != SEC_SHARE) &&
 248             lp_use_spnego() &&
 249             (SVAL(inbuf, smb_flg2) & FLAGS2_EXTENDED_SECURITY)) {
 250                 negotiate_spnego = True;
 251                 capabilities |= CAP_EXTENDED_SECURITY;
 252         }
 253
 254         capabilities |= CAP_NT_SMBS|CAP_RPC_REMOTE_APIS|CAP_UNICODE;
 255
 256         if (lp_unix_extensions()) {
 257                 capabilities |= CAP_UNIX;
 258         }
 259
 260         if (lp_large_readwrite() && (SMB_OFF_T_BITS == 64))
 261                 capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX|CAP_W2K_SMBS;
 262
 263         if (SMB_OFF_T_BITS == 64)
 264                 capabilities |= CAP_LARGE_FILES;
 265
 266         if (lp_readraw() && lp_writeraw())
 267                 capabilities |= CAP_RAW_MODE;
 268
 269         if (lp_nt_status_support())
 270                 capabilities |= CAP_STATUS32;
 271
 272         if (lp_host_msdfs())
 273                 capabilities |= CAP_DFS;
 274
 275         if (lp_security() >= SEC_USER)
 276                 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
 277         if (global_encrypted_passwords_negotiated)
 278                 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
 279
 280         if (lp_server_signing()) {
 281                 if (lp_security() >= SEC_USER) {
 282                         secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
 283                         /* No raw mode with smb signing. */
 284                         capabilities &= ~CAP_RAW_MODE;
 285                         if (lp_server_signing() == Required)
 286                                 secword |=NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
 287                         srv_set_signing_negotiated();
 288                 } else {
 289                         DEBUG(0,("reply_nt1: smb signing is incompatible with share level security !\n"));
 290                         if (lp_server_signing() == Required) {
 291                                 exit_server("reply_nt1: smb signing required and share level security selected.");
 292                         }
 293                 }
 294         }
 295
 296         set_message(outbuf,17,0,True);
 297
 298         SCVAL(outbuf,smb_vwv1,secword);
 299
 300         Protocol = PROTOCOL_NT1;
 301
 302         SSVAL(outbuf,smb_vwv1+1,lp_maxmux()); /* maxmpx */
 303         SSVAL(outbuf,smb_vwv2+1,1); /* num vcs */
 304         SIVAL(outbuf,smb_vwv3+1,max_recv); /* max buffer. LOTS! */
 305         SIVAL(outbuf,smb_vwv5+1,0x10000); /* raw size. full 64k */
 306         SIVAL(outbuf,smb_vwv7+1,sys_getpid()); /* session key */
 307         SIVAL(outbuf,smb_vwv9+1,capabilities); /* capabilities */
 308         put_long_date(outbuf+smb_vwv11+1,t);
 309         SSVALS(outbuf,smb_vwv15+1,TimeDiff(t)/60);
 310
 311         p = q = smb_buf(outbuf);
 312         if (!negotiate_spnego) {
 313                 /* Create a token value and add it to the outgoing packet. */
 314                 if (global_encrypted_passwords_negotiated) {
 315                         /* note that we do not send a challenge at all if
 316                            we are using plaintext */
 317                         get_challenge(p);
 318                         SSVALS(outbuf,smb_vwv16+1,8);
 319                         p += 8;
 320                 }
 321                 p += srvstr_push(outbuf, p, lp_workgroup(), -1,
 322                                  STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
 323                 DEBUG(3,("not using SPNEGO\n"));
 324         } else {
 325                 int len = negprot_spnego(p);
 326
 327                 SSVALS(outbuf,smb_vwv16+1,len);
 328                 p += len;
 329                 DEBUG(3,("using SPNEGO\n"));
 330         }
 331
 332         SSVAL(outbuf,smb_vwv17, p - q); /* length of challenge+domain strings */
 333         set_message_end(outbuf, p);
 334
 335         return (smb_len(outbuf)+4);
 336 }
 337
 338 /* these are the protocol lists used for auto architecture detection:
 339
 340 WinNT 3.51:
 341 protocol [PC NETWORK PROGRAM 1.0]
 342 protocol [XENIX CORE]
 343 protocol [MICROSOFT NETWORKS 1.03]
 344 protocol [LANMAN1.0]
 345 protocol [Windows for Workgroups 3.1a]
 346 protocol [LM1.2X002]
 347 protocol [LANMAN2.1]
 348 protocol [NT LM 0.12]
 349
 350 Win95:
 351 protocol [PC NETWORK PROGRAM 1.0]
 352 protocol [XENIX CORE]
 353 protocol [MICROSOFT NETWORKS 1.03]
 354 protocol [LANMAN1.0]
 355 protocol [Windows for Workgroups 3.1a]
 356 protocol [LM1.2X002]
 357 protocol [LANMAN2.1]
 358 protocol [NT LM 0.12]
 359
 360 Win2K:
 361 protocol [PC NETWORK PROGRAM 1.0]
 362 protocol [LANMAN1.0]
 363 protocol [Windows for Workgroups 3.1a]
 364 protocol [LM1.2X002]
 365 protocol [LANMAN2.1]
 366 protocol [NT LM 0.12]
 367
 368 OS/2:
 369 protocol [PC NETWORK PROGRAM 1.0]
 370 protocol [XENIX CORE]
 371 protocol [LANMAN1.0]
 372 protocol [LM1.2X002]
 373 protocol [LANMAN2.1]
 374 */
 375
 376 /*
 377   * Modified to recognize the architecture of the remote machine better.
 378   *
 379   * This appears to be the matrix of which protocol is used by which
 380   * MS product.
 381        Protocol                       WfWg    Win95   WinNT  Win2K  OS/2
 382        PC NETWORK PROGRAM 1.0          1       1       1      1      1
 383        XENIX CORE                                      2             2
 384        MICROSOFT NETWORKS 3.0          2       2
 385        DOS LM1.2X002                   3       3
 386        MICROSOFT NETWORKS 1.03                         3
 387        DOS LANMAN2.1                   4       4
 388        LANMAN1.0                                       4      2      3
 389        Windows for Workgroups 3.1a     5       5       5      3
 390        LM1.2X002                                       6      4      4
 391        LANMAN2.1                                       7      5      5
 392        NT LM 0.12                              6       8      6
 393   *
 394   *  tim@fsg.com 09/29/95
 395   *  Win2K added by matty 17/7/99
 396   */
 397
 398 #define ARCH_WFWG     0x3      /* This is a fudge because WfWg is like Win95 */
 399 #define ARCH_WIN95    0x2
 400 #define ARCH_WINNT    0x4
 401 #define ARCH_WIN2K    0xC      /* Win2K is like NT */
 402 #define ARCH_OS2      0x14     /* Again OS/2 is like NT */
 403 #define ARCH_SAMBA    0x20
 404
 405 #define ARCH_ALL      0x3F
 406
 407 /* List of supported protocols, most desired first */
 408 static const struct {
 409         const char *proto_name;
 410         const char *short_name;
 411         int (*proto_reply_fn)(char *, char *);
 412         int protocol_level;
 413 } supported_protocols[] = {
 414         {"NT LANMAN 1.0",           "NT1",      reply_nt1,      PROTOCOL_NT1},
 415         {"NT LM 0.12",              "NT1",      reply_nt1,      PROTOCOL_NT1},
 416         {"LM1.2X002",               "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
 417         {"Samba",                   "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
 418         {"DOS LM1.2X002",           "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
 419         {"LANMAN1.0",               "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
 420         {"MICROSOFT NETWORKS 3.0",  "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
 421         {"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus, PROTOCOL_COREPLUS},
 422         {"PC NETWORK PROGRAM 1.0",  "CORE",     reply_corep,    PROTOCOL_CORE},
 423         {NULL,NULL,NULL,0},
 424 };
 425
 426 /****************************************************************************
 427  Reply to a negprot.
 428 ****************************************************************************/
 429
 430 int reply_negprot(connection_struct *conn,
 431                   char *inbuf,char *outbuf, int dum_size,
 432                   int dum_buffsize)
 433 {
 434         int outsize = set_message(outbuf,1,0,True);
 435         int Index=0;
 436         int choice= -1;
 437         int protocol;
 438         char *p;
 439         int bcc = SVAL(smb_buf(inbuf),-2);
 440         int arch = ARCH_ALL;
 441
 442         static BOOL done_negprot = False;
 443
 444         START_PROFILE(SMBnegprot);
 445
 446         if (done_negprot) {
 447                 END_PROFILE(SMBnegprot);
 448                 exit_server("multiple negprot's are not permitted");
 449         }
 450         done_negprot = True;
 451
 452         p = smb_buf(inbuf)+1;
 453         while (p < (smb_buf(inbuf) + bcc)) {
 454                 Index++;
 455                 DEBUG(3,("Requested protocol [%s]\n",p));
 456                 if (strcsequal(p,"Windows for Workgroups 3.1a"))
 457                         arch &= ( ARCH_WFWG | ARCH_WIN95 | ARCH_WINNT | ARCH_WIN2K );
 458                 else if (strcsequal(p,"DOS LM1.2X002"))
 459                         arch &= ( ARCH_WFWG | ARCH_WIN95 );
 460                 else if (strcsequal(p,"DOS LANMAN2.1"))
 461                         arch &= ( ARCH_WFWG | ARCH_WIN95 );
 462                 else if (strcsequal(p,"NT LM 0.12"))
 463                         arch &= ( ARCH_WIN95 | ARCH_WINNT | ARCH_WIN2K );
 464                 else if (strcsequal(p,"LANMAN2.1"))
 465                         arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 );
 466                 else if (strcsequal(p,"LM1.2X002"))
 467                         arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 );
 468                 else if (strcsequal(p,"MICROSOFT NETWORKS 1.03"))
 469                         arch &= ARCH_WINNT;
 470                 else if (strcsequal(p,"XENIX CORE"))
 471                         arch &= ( ARCH_WINNT | ARCH_OS2 );
 472                 else if (strcsequal(p,"Samba")) {
 473                         arch = ARCH_SAMBA;
 474                         break;
 475                 }
 476
 477                 p += strlen(p) + 2;
 478         }
 479
 480         switch ( arch ) {
 481                 case ARCH_SAMBA:
 482                         set_remote_arch(RA_SAMBA);
 483                         break;
 484                 case ARCH_WFWG:
 485                         set_remote_arch(RA_WFWG);
 486                         break;
 487                 case ARCH_WIN95:
 488                         set_remote_arch(RA_WIN95);
 489                         break;
 490                 case ARCH_WINNT:
 491                         if(SVAL(inbuf,smb_flg2)==FLAGS2_WIN2K_SIGNATURE)
 492                                 set_remote_arch(RA_WIN2K);
 493                         else
 494                                 set_remote_arch(RA_WINNT);
 495                         break;
 496                 case ARCH_WIN2K:
 497                         set_remote_arch(RA_WIN2K);
 498                         break;
 499                 case ARCH_OS2:
 500                         set_remote_arch(RA_OS2);
 501                         break;
 502                 default:
 503                         set_remote_arch(RA_UNKNOWN);
 504                 break;
 505         }
 506
 507         /* possibly reload - change of architecture */
 508         reload_services(True);
 509
 510         /* Check for protocols, most desirable first */
 511         for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
 512                 p = smb_buf(inbuf)+1;
 513                 Index = 0;
 514                 if ((supported_protocols[protocol].protocol_level <= lp_maxprotocol()) &&
 515                                 (supported_protocols[protocol].protocol_level >= lp_minprotocol()))
 516                         while (p < (smb_buf(inbuf) + bcc)) {
 517                                 if (strequal(p,supported_protocols[protocol].proto_name))
 518                                         choice = Index;
 519                                 Index++;
 520                                 p += strlen(p) + 2;
 521                         }
 522                 if(choice != -1)
 523                         break;
 524         }
 525
 526         SSVAL(outbuf,smb_vwv0,choice);
 527         if(choice != -1) {
 528                 extern fstring remote_proto;
 529                 fstrcpy(remote_proto,supported_protocols[protocol].short_name);
 530                 reload_services(True);
 531                 outsize = supported_protocols[protocol].proto_reply_fn(inbuf, outbuf);
 532                 DEBUG(3,("Selected protocol %s\n",supported_protocols[protocol].proto_name));
 533         } else {
 534                 DEBUG(0,("No protocol supported !\n"));
 535         }
 536         SSVAL(outbuf,smb_vwv0,choice);
 537
 538         DEBUG( 5, ( "negprot index=%d\n", choice ) );
 539
 540         if ((lp_server_signing() == Required) && (Protocol < PROTOCOL_NT1)) {
 541                 exit_server("SMB signing is required and client negotiated a downlevel protocol");
 542         }
 543
 544         END_PROFILE(SMBnegprot);
 545         return(outsize);
 546 }