net/http/http_auth_handler_ntlm_portable.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/http/http_auth_handler_ntlm.h"
   6
   7 #include <stdlib.h>
   8 // For gethostname
   9 #if defined(OS_POSIX)
  10 #include <unistd.h>
  11 #elif defined(OS_WIN)
  12 #include <winsock2.h>
  13 #endif
  14
  15 #include "base/md5.h"
  16 #include "base/rand_util.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/sys_string_conversions.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "net/base/net_errors.h"
  21 #include "net/base/net_util.h"
  22 #include "net/base/zap.h"
  23 #include "net/http/des.h"
  24 #include "net/http/md4.h"
  25
  26 namespace net {
  27
  28 // Based on mozilla/security/manager/ssl/src/nsNTLMAuthModule.cpp,
  29 // CVS rev. 1.14.
  30 //
  31 // TODO(wtc):
  32 // - The IS_BIG_ENDIAN code is not tested.
  33 // - Enable the logging code or just delete it.
  34 // - Delete or comment out the LM code, which hasn't been tested and isn't
  35 //   being used.
  36
  37 /* ***** BEGIN LICENSE BLOCK *****
  38  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  39  *
  40  * The contents of this file are subject to the Mozilla Public License Version
  41  * 1.1 (the "License"); you may not use this file except in compliance with
  42  * the License. You may obtain a copy of the License at
  43  * http://www.mozilla.org/MPL/
  44  *
  45  * Software distributed under the License is distributed on an "AS IS" basis,
  46  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  47  * for the specific language governing rights and limitations under the
  48  * License.
  49  *
  50  * The Original Code is Mozilla.
  51  *
  52  * The Initial Developer of the Original Code is IBM Corporation.
  53  * Portions created by IBM Corporation are Copyright (C) 2003
  54  * IBM Corporation. All Rights Reserved.
  55  *
  56  * Contributor(s):
  57  *   Darin Fisher <darin@meer.net>
  58  *
  59  * Alternatively, the contents of this file may be used under the terms of
  60  * either the GNU General Public License Version 2 or later (the "GPL"), or
  61  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  62  * in which case the provisions of the GPL or the LGPL are applicable instead
  63  * of those above. If you wish to allow use of your version of this file only
  64  * under the terms of either the GPL or the LGPL, and not to allow others to
  65  * use your version of this file under the terms of the MPL, indicate your
  66  * decision by deleting the provisions above and replace them with the notice
  67  * and other provisions required by the GPL or the LGPL. If you do not delete
  68  * the provisions above, a recipient may use your version of this file under
  69  * the terms of any one of the MPL, the GPL or the LGPL.
  70  *
  71  * ***** END LICENSE BLOCK ***** */
  72
  73 #if defined(ARCH_CPU_LITTLE_ENDIAN)
  74 #define IS_LITTLE_ENDIAN 1
  75 #undef  IS_BIG_ENDIAN
  76 #elif defined(ARCH_CPU_BIG_ENDIAN)
  77 #define IS_BIG_ENDIAN 1
  78 #undef  IS_LITTLE_ENDIAN
  79 #else
  80 #error "Unknown endianness"
  81 #endif
  82
  83 #define NTLM_LOG(x) ((void) 0)
  84
  85 //-----------------------------------------------------------------------------
  86 // This file contains a cross-platform NTLM authentication implementation. It
  87 // is based on documentation from: http://davenport.sourceforge.net/ntlm.html
  88 //-----------------------------------------------------------------------------
  89
  90 enum {
  91   NTLM_NegotiateUnicode             = 0x00000001,
  92   NTLM_NegotiateOEM                 = 0x00000002,
  93   NTLM_RequestTarget                = 0x00000004,
  94   NTLM_Unknown1                     = 0x00000008,
  95   NTLM_NegotiateSign                = 0x00000010,
  96   NTLM_NegotiateSeal                = 0x00000020,
  97   NTLM_NegotiateDatagramStyle       = 0x00000040,
  98   NTLM_NegotiateLanManagerKey       = 0x00000080,
  99   NTLM_NegotiateNetware             = 0x00000100,
 100   NTLM_NegotiateNTLMKey             = 0x00000200,
 101   NTLM_Unknown2                     = 0x00000400,
 102   NTLM_Unknown3                     = 0x00000800,
 103   NTLM_NegotiateDomainSupplied      = 0x00001000,
 104   NTLM_NegotiateWorkstationSupplied = 0x00002000,
 105   NTLM_NegotiateLocalCall           = 0x00004000,
 106   NTLM_NegotiateAlwaysSign          = 0x00008000,
 107   NTLM_TargetTypeDomain             = 0x00010000,
 108   NTLM_TargetTypeServer             = 0x00020000,
 109   NTLM_TargetTypeShare              = 0x00040000,
 110   NTLM_NegotiateNTLM2Key            = 0x00080000,
 111   NTLM_RequestInitResponse          = 0x00100000,
 112   NTLM_RequestAcceptResponse        = 0x00200000,
 113   NTLM_RequestNonNTSessionKey       = 0x00400000,
 114   NTLM_NegotiateTargetInfo          = 0x00800000,
 115   NTLM_Unknown4                     = 0x01000000,
 116   NTLM_Unknown5                     = 0x02000000,
 117   NTLM_Unknown6                     = 0x04000000,
 118   NTLM_Unknown7                     = 0x08000000,
 119   NTLM_Unknown8                     = 0x10000000,
 120   NTLM_Negotiate128                 = 0x20000000,
 121   NTLM_NegotiateKeyExchange         = 0x40000000,
 122   NTLM_Negotiate56                  = 0x80000000
 123 };
 124
 125 // We send these flags with our type 1 message.
 126 enum {
 127   NTLM_TYPE1_FLAGS = (NTLM_NegotiateUnicode |
 128                       NTLM_NegotiateOEM |
 129                       NTLM_RequestTarget |
 130                       NTLM_NegotiateNTLMKey |
 131                       NTLM_NegotiateAlwaysSign |
 132                       NTLM_NegotiateNTLM2Key)
 133 };
 134
 135 static const char NTLM_SIGNATURE[] = "NTLMSSP";
 136 static const char NTLM_TYPE1_MARKER[] = { 0x01, 0x00, 0x00, 0x00 };
 137 static const char NTLM_TYPE2_MARKER[] = { 0x02, 0x00, 0x00, 0x00 };
 138 static const char NTLM_TYPE3_MARKER[] = { 0x03, 0x00, 0x00, 0x00 };
 139
 140 enum {
 141   NTLM_TYPE1_HEADER_LEN = 32,
 142   NTLM_TYPE2_HEADER_LEN = 32,
 143   NTLM_TYPE3_HEADER_LEN = 64,
 144
 145   LM_HASH_LEN = 16,
 146   LM_RESP_LEN = 24,
 147
 148   NTLM_HASH_LEN = 16,
 149   NTLM_RESP_LEN = 24
 150 };
 151
 152 //-----------------------------------------------------------------------------
 153
 154 // The return value of this function controls whether or not the LM hash will
 155 // be included in response to a NTLM challenge.
 156 //
 157 // In Mozilla, this function returns the value of the boolean preference
 158 // "network.ntlm.send-lm-response".  By default, the preference is disabled
 159 // since servers should almost never need the LM hash, and the LM hash is what
 160 // makes NTLM authentication less secure.  See
 161 // https://bugzilla.mozilla.org/show_bug.cgi?id=250691 for further details.
 162 //
 163 // We just return a hardcoded false.
 164 static bool SendLM() {
 165   return false;
 166 }
 167
 168 //-----------------------------------------------------------------------------
 169
 170 #define LogFlags(x) ((void) 0)
 171 #define LogBuf(a, b, c) ((void) 0)
 172 #define LogToken(a, b, c) ((void) 0)
 173
 174 //-----------------------------------------------------------------------------
 175
 176 // Byte order swapping.
 177 #define SWAP16(x) ((((x) & 0xff) << 8) | (((x) >> 8) & 0xff))
 178 #define SWAP32(x) ((SWAP16((x) & 0xffff) << 16) | (SWAP16((x) >> 16)))
 179
 180 static void* WriteBytes(void* buf, const void* data, uint32 data_len) {
 181   memcpy(buf, data, data_len);
 182   return static_cast<char*>(buf) + data_len;
 183 }
 184
 185 static void* WriteDWORD(void* buf, uint32 dword) {
 186 #ifdef IS_BIG_ENDIAN
 187   // NTLM uses little endian on the wire.
 188   dword = SWAP32(dword);
 189 #endif
 190   return WriteBytes(buf, &dword, sizeof(dword));
 191 }
 192
 193 static void* WriteSecBuf(void* buf, uint16 length, uint32 offset) {
 194 #ifdef IS_BIG_ENDIAN
 195   length = SWAP16(length);
 196   offset = SWAP32(offset);
 197 #endif
 198   // Len: 2 bytes.
 199   buf = WriteBytes(buf, &length, sizeof(length));
 200   // MaxLen: 2 bytes. The sender should set it to the value of Len. The
 201   // recipient must ignore it.
 202   buf = WriteBytes(buf, &length, sizeof(length));
 203   // BufferOffset: 4 bytes.
 204   buf = WriteBytes(buf, &offset, sizeof(offset));
 205   return buf;
 206 }
 207
 208 #ifdef IS_BIG_ENDIAN
 209 /**
 210  * WriteUnicodeLE copies a unicode string from one buffer to another.  The
 211  * resulting unicode string is in little-endian format.  The input string is
 212  * assumed to be in the native endianness of the local machine.  It is safe
 213  * to pass the same buffer as both input and output, which is a handy way to
 214  * convert the unicode buffer to little-endian on big-endian platforms.
 215  */
 216 static void* WriteUnicodeLE(
 217     void* buf, const base::char16* str, uint32 str_len) {
 218   // Convert input string from BE to LE.
 219   uint8* cursor = static_cast<uint8*>(buf);
 220   const uint8* input  = reinterpret_cast<const uint8*>(str);
 221   for (uint32 i = 0; i < str_len; ++i, input += 2, cursor += 2) {
 222     // Allow for the case where |buf == str|.
 223     uint8 temp = input[0];
 224     cursor[0] = input[1];
 225     cursor[1] = temp;
 226   }
 227   return buf;
 228 }
 229 #endif
 230
 231 static uint16 ReadUint16(const uint8*& buf) {
 232   uint16 x = (static_cast<uint16>(buf[0]))      |
 233              (static_cast<uint16>(buf[1]) << 8);
 234   buf += sizeof(x);
 235   return x;
 236 }
 237
 238 static uint32 ReadUint32(const uint8*& buf) {
 239   uint32 x = (static_cast<uint32>(buf[0]))       |
 240              (static_cast<uint32>(buf[1]) << 8)  |
 241              (static_cast<uint32>(buf[2]) << 16) |
 242              (static_cast<uint32>(buf[3]) << 24);
 243   buf += sizeof(x);
 244   return x;
 245 }
 246
 247 //-----------------------------------------------------------------------------
 248
 249 // LM_Hash computes the LM hash of the given password.
 250 //
 251 // param password
 252 //       unicode password.
 253 // param hash
 254 //       16-byte result buffer
 255 //
 256 // Note: This function is not being used because our SendLM() function always
 257 // returns false.
 258 static void LM_Hash(const base::string16& password, uint8* hash) {
 259   static const uint8 LM_MAGIC[] = "KGS!@#$%";
 260
 261   // Convert password to OEM character set.  We'll just use the native
 262   // filesystem charset.
 263   std::string passbuf = base::SysWideToNativeMB(base::UTF16ToWide(password));
 264   StringToUpperASCII(&passbuf);
 265   passbuf.resize(14, '\0');
 266
 267   uint8 k1[8], k2[8];
 268   DESMakeKey(reinterpret_cast<const uint8*>(passbuf.data())    , k1);
 269   DESMakeKey(reinterpret_cast<const uint8*>(passbuf.data()) + 7, k2);
 270   ZapString(&passbuf);
 271
 272   // Use password keys to hash LM magic string twice.
 273   DESEncrypt(k1, LM_MAGIC, hash);
 274   DESEncrypt(k2, LM_MAGIC, hash + 8);
 275 }
 276
 277 // NTLM_Hash computes the NTLM hash of the given password.
 278 //
 279 // param password
 280 //       null-terminated unicode password.
 281 // param hash
 282 //       16-byte result buffer
 283 static void NTLM_Hash(const base::string16& password, uint8* hash) {
 284 #ifdef IS_BIG_ENDIAN
 285   uint32 len = password.length();
 286   uint8* passbuf;
 287
 288   passbuf = static_cast<uint8*>(malloc(len * 2));
 289   WriteUnicodeLE(passbuf, password.data(), len);
 290   weak_crypto::MD4Sum(passbuf, len * 2, hash);
 291
 292   ZapBuf(passbuf, len * 2);
 293   free(passbuf);
 294 #else
 295   weak_crypto::MD4Sum(reinterpret_cast<const uint8*>(password.data()),
 296                       password.length() * 2, hash);
 297 #endif
 298 }
 299
 300 //-----------------------------------------------------------------------------
 301
 302 // LM_Response generates the LM response given a 16-byte password hash and the
 303 // challenge from the Type-2 message.
 304 //
 305 // param hash
 306 //       16-byte password hash
 307 // param challenge
 308 //       8-byte challenge from Type-2 message
 309 // param response
 310 //       24-byte buffer to contain the LM response upon return
 311 static void LM_Response(const uint8* hash,
 312                         const uint8* challenge,
 313                         uint8* response) {
 314   uint8 keybytes[21], k1[8], k2[8], k3[8];
 315
 316   memcpy(keybytes, hash, 16);
 317   ZapBuf(keybytes + 16, 5);
 318
 319   DESMakeKey(keybytes     , k1);
 320   DESMakeKey(keybytes +  7, k2);
 321   DESMakeKey(keybytes + 14, k3);
 322
 323   DESEncrypt(k1, challenge, response);
 324   DESEncrypt(k2, challenge, response + 8);
 325   DESEncrypt(k3, challenge, response + 16);
 326 }
 327
 328 //-----------------------------------------------------------------------------
 329
 330 // Returns OK or a network error code.
 331 static int GenerateType1Msg(void** out_buf, uint32* out_len) {
 332   //
 333   // Verify that buf_len is sufficient.
 334   //
 335   *out_len = NTLM_TYPE1_HEADER_LEN;
 336   *out_buf = malloc(*out_len);
 337   if (!*out_buf)
 338     return ERR_OUT_OF_MEMORY;
 339
 340   //
 341   // Write out type 1 message.
 342   //
 343   void* cursor = *out_buf;
 344
 345   // 0 : signature
 346   cursor = WriteBytes(cursor, NTLM_SIGNATURE, sizeof(NTLM_SIGNATURE));
 347
 348   // 8 : marker
 349   cursor = WriteBytes(cursor, NTLM_TYPE1_MARKER, sizeof(NTLM_TYPE1_MARKER));
 350
 351   // 12 : flags
 352   cursor = WriteDWORD(cursor, NTLM_TYPE1_FLAGS);
 353
 354   //
 355   // NOTE: It is common for the domain and workstation fields to be empty.
 356   //       This is true of Win2k clients, and my guess is that there is
 357   //       little utility to sending these strings before the charset has
 358   //       been negotiated.  We follow suite -- anyways, it doesn't hurt
 359   //       to save some bytes on the wire ;-)
 360   //
 361
 362   // 16 : supplied domain security buffer (empty)
 363   cursor = WriteSecBuf(cursor, 0, 0);
 364
 365   // 24 : supplied workstation security buffer (empty)
 366   cursor = WriteSecBuf(cursor, 0, 0);
 367
 368   return OK;
 369 }
 370
 371 struct Type2Msg {
 372   uint32      flags;         // NTLM_Xxx bitwise combination
 373   uint8       challenge[8];  // 8 byte challenge
 374   const void* target;        // target string (type depends on flags)
 375   uint32      target_len;    // target length in bytes
 376 };
 377
 378 // Returns OK or a network error code.
 379 // TODO(wtc): This function returns ERR_UNEXPECTED when the input message is
 380 // invalid.  We should return a better error code.
 381 static int ParseType2Msg(const void* in_buf, uint32 in_len, Type2Msg* msg) {
 382   // Make sure in_buf is long enough to contain a meaningful type2 msg.
 383   //
 384   // 0  NTLMSSP Signature
 385   // 8  NTLM Message Type
 386   // 12 Target Name
 387   // 20 Flags
 388   // 24 Challenge
 389   // 32 end of header, start of optional data blocks
 390   //
 391   if (in_len < NTLM_TYPE2_HEADER_LEN)
 392     return ERR_UNEXPECTED;
 393
 394   const uint8* cursor = (const uint8*) in_buf;
 395
 396   // verify NTLMSSP signature
 397   if (memcmp(cursor, NTLM_SIGNATURE, sizeof(NTLM_SIGNATURE)) != 0)
 398     return ERR_UNEXPECTED;
 399   cursor += sizeof(NTLM_SIGNATURE);
 400
 401   // verify Type-2 marker
 402   if (memcmp(cursor, NTLM_TYPE2_MARKER, sizeof(NTLM_TYPE2_MARKER)) != 0)
 403     return ERR_UNEXPECTED;
 404   cursor += sizeof(NTLM_TYPE2_MARKER);
 405
 406   // read target name security buffer
 407   uint32 target_len = ReadUint16(cursor);
 408   ReadUint16(cursor);  // discard next 16-bit value
 409   uint32 offset = ReadUint32(cursor);  // get offset from in_buf
 410   msg->target_len = 0;
 411   msg->target = NULL;
 412   // Check the offset / length combo is in range of the input buffer, including
 413   // integer overflow checking.
 414   if (offset + target_len > offset && offset + target_len <= in_len) {
 415     msg->target_len = target_len;
 416     msg->target = ((const uint8*) in_buf) + offset;
 417   }
 418
 419   // read flags
 420   msg->flags = ReadUint32(cursor);
 421
 422   // read challenge
 423   memcpy(msg->challenge, cursor, sizeof(msg->challenge));
 424   cursor += sizeof(msg->challenge);
 425
 426   NTLM_LOG(("NTLM type 2 message:\n"));
 427   LogBuf("target", (const uint8*) msg->target, msg->target_len);
 428   LogBuf("flags", (const uint8*) &msg->flags, 4);
 429   LogFlags(msg->flags);
 430   LogBuf("challenge", msg->challenge, sizeof(msg->challenge));
 431
 432   // We currently do not implement LMv2/NTLMv2 or NTLM2 responses,
 433   // so we can ignore target information.  We may want to enable
 434   // support for these alternate mechanisms in the future.
 435   return OK;
 436 }
 437
 438 static void GenerateRandom(uint8* output, size_t n) {
 439   for (size_t i = 0; i < n; ++i)
 440     output[i] = base::RandInt(0, 255);
 441 }
 442
 443 // Returns OK or a network error code.
 444 static int GenerateType3Msg(const base::string16& domain,
 445                             const base::string16& username,
 446                             const base::string16& password,
 447                             const std::string& hostname,
 448                             const void* rand_8_bytes,
 449                             const void* in_buf,
 450                             uint32 in_len,
 451                             void** out_buf,
 452                             uint32* out_len) {
 453   // in_buf contains Type-2 msg (the challenge) from server.
 454
 455   int rv;
 456   Type2Msg msg;
 457
 458   rv = ParseType2Msg(in_buf, in_len, &msg);
 459   if (rv != OK)
 460     return rv;
 461
 462   bool unicode = (msg.flags & NTLM_NegotiateUnicode) != 0;
 463
 464   // Temporary buffers for unicode strings
 465 #ifdef IS_BIG_ENDIAN
 466   base::string16 ucs_domain_buf, ucs_user_buf;
 467 #endif
 468   base::string16 ucs_host_buf;
 469   // Temporary buffers for oem strings
 470   std::string oem_domain_buf, oem_user_buf;
 471   // Pointers and lengths for the string buffers; encoding is unicode if
 472   // the "negotiate unicode" flag was set in the Type-2 message.
 473   const void* domain_ptr;
 474   const void* user_ptr;
 475   const void* host_ptr;
 476   uint32 domain_len, user_len, host_len;
 477
 478   //
 479   // Get domain name.
 480   //
 481   if (unicode) {
 482 #ifdef IS_BIG_ENDIAN
 483     ucs_domain_buf = domain;
 484     domain_ptr = ucs_domain_buf.data();
 485     domain_len = ucs_domain_buf.length() * 2;
 486     WriteUnicodeLE(const_cast<void*>(domain_ptr),
 487                    (const base::char16*) domain_ptr,
 488                    ucs_domain_buf.length());
 489 #else
 490     domain_ptr = domain.data();
 491     domain_len = domain.length() * 2;
 492 #endif
 493   } else {
 494     oem_domain_buf = base::SysWideToNativeMB(base::UTF16ToWide(domain));
 495     domain_ptr = oem_domain_buf.data();
 496     domain_len = oem_domain_buf.length();
 497   }
 498
 499   //
 500   // Get user name.
 501   //
 502   if (unicode) {
 503 #ifdef IS_BIG_ENDIAN
 504     ucs_user_buf = username;
 505     user_ptr = ucs_user_buf.data();
 506     user_len = ucs_user_buf.length() * 2;
 507     WriteUnicodeLE(const_cast<void*>(user_ptr), (const base::char16*) user_ptr,
 508                    ucs_user_buf.length());
 509 #else
 510     user_ptr = username.data();
 511     user_len = username.length() * 2;
 512 #endif
 513   } else {
 514     oem_user_buf = base::SysWideToNativeMB(base::UTF16ToWide(username));
 515     user_ptr = oem_user_buf.data();
 516     user_len = oem_user_buf.length();
 517   }
 518
 519   //
 520   // Get workstation name (use local machine's hostname).
 521   //
 522   if (unicode) {
 523     // hostname is ASCII, so we can do a simple zero-pad expansion:
 524     ucs_host_buf.assign(hostname.begin(), hostname.end());
 525     host_ptr = ucs_host_buf.data();
 526     host_len = ucs_host_buf.length() * 2;
 527 #ifdef IS_BIG_ENDIAN
 528     WriteUnicodeLE(const_cast<void*>(host_ptr), (const base::char16*) host_ptr,
 529                    ucs_host_buf.length());
 530 #endif
 531   } else {
 532     host_ptr = hostname.data();
 533     host_len = hostname.length();
 534   }
 535
 536   //
 537   // Now that we have generated all of the strings, we can allocate out_buf.
 538   //
 539   *out_len = NTLM_TYPE3_HEADER_LEN + host_len + domain_len + user_len +
 540              LM_RESP_LEN + NTLM_RESP_LEN;
 541   *out_buf = malloc(*out_len);
 542   if (!*out_buf)
 543     return ERR_OUT_OF_MEMORY;
 544
 545   //
 546   // Next, we compute the LM and NTLM responses.
 547   //
 548   uint8 lm_resp[LM_RESP_LEN];
 549   uint8 ntlm_resp[NTLM_RESP_LEN];
 550   uint8 ntlm_hash[NTLM_HASH_LEN];
 551   if (msg.flags & NTLM_NegotiateNTLM2Key) {
 552     // compute NTLM2 session response
 553     base::MD5Digest session_hash;
 554     uint8 temp[16];
 555
 556     memcpy(lm_resp, rand_8_bytes, 8);
 557     memset(lm_resp + 8, 0, LM_RESP_LEN - 8);
 558
 559     memcpy(temp, msg.challenge, 8);
 560     memcpy(temp + 8, lm_resp, 8);
 561     base::MD5Sum(temp, 16, &session_hash);
 562
 563     NTLM_Hash(password, ntlm_hash);
 564     LM_Response(ntlm_hash, session_hash.a, ntlm_resp);
 565   } else {
 566     NTLM_Hash(password, ntlm_hash);
 567     LM_Response(ntlm_hash, msg.challenge, ntlm_resp);
 568
 569     if (SendLM()) {
 570       uint8 lm_hash[LM_HASH_LEN];
 571       LM_Hash(password, lm_hash);
 572       LM_Response(lm_hash, msg.challenge, lm_resp);
 573     } else {
 574       // According to http://davenport.sourceforge.net/ntlm.html#ntlmVersion2,
 575       // the correct way to not send the LM hash is to send the NTLM hash twice
 576       // in both the LM and NTLM response fields.
 577       LM_Response(ntlm_hash, msg.challenge, lm_resp);
 578     }
 579   }
 580
 581   //
 582   // Finally, we assemble the Type-3 msg :-)
 583   //
 584   void* cursor = *out_buf;
 585   uint32 offset;
 586
 587   // 0 : signature
 588   cursor = WriteBytes(cursor, NTLM_SIGNATURE, sizeof(NTLM_SIGNATURE));
 589
 590   // 8 : marker
 591   cursor = WriteBytes(cursor, NTLM_TYPE3_MARKER, sizeof(NTLM_TYPE3_MARKER));
 592
 593   // 12 : LM response sec buf
 594   offset = NTLM_TYPE3_HEADER_LEN + domain_len + user_len + host_len;
 595   cursor = WriteSecBuf(cursor, LM_RESP_LEN, offset);
 596   memcpy(static_cast<uint8*>(*out_buf) + offset, lm_resp, LM_RESP_LEN);
 597
 598   // 20 : NTLM response sec buf
 599   offset += LM_RESP_LEN;
 600   cursor = WriteSecBuf(cursor, NTLM_RESP_LEN, offset);
 601   memcpy(static_cast<uint8*>(*out_buf) + offset, ntlm_resp, NTLM_RESP_LEN);
 602
 603   // 28 : domain name sec buf
 604   offset = NTLM_TYPE3_HEADER_LEN;
 605   cursor = WriteSecBuf(cursor, domain_len, offset);
 606   memcpy(static_cast<uint8*>(*out_buf) + offset, domain_ptr, domain_len);
 607
 608   // 36 : user name sec buf
 609   offset += domain_len;
 610   cursor = WriteSecBuf(cursor, user_len, offset);
 611   memcpy(static_cast<uint8*>(*out_buf) + offset, user_ptr, user_len);
 612
 613   // 44 : workstation (host) name sec buf
 614   offset += user_len;
 615   cursor = WriteSecBuf(cursor, host_len, offset);
 616   memcpy(static_cast<uint8*>(*out_buf) + offset, host_ptr, host_len);
 617
 618   // 52 : session key sec buf (not used)
 619   cursor = WriteSecBuf(cursor, 0, 0);
 620
 621   // 60 : negotiated flags
 622   cursor = WriteDWORD(cursor, msg.flags & NTLM_TYPE1_FLAGS);
 623
 624   return OK;
 625 }
 626
 627 // NTLM authentication is specified in "NTLM Over HTTP Protocol Specification"
 628 // [MS-NTHT].
 629
 630 // static
 631 HttpAuthHandlerNTLM::GenerateRandomProc
 632 HttpAuthHandlerNTLM::generate_random_proc_ = GenerateRandom;
 633
 634 // static
 635 HttpAuthHandlerNTLM::HostNameProc
 636 HttpAuthHandlerNTLM::get_host_name_proc_ = GetHostName;
 637
 638 HttpAuthHandlerNTLM::HttpAuthHandlerNTLM() {
 639 }
 640
 641 bool HttpAuthHandlerNTLM::NeedsIdentity() {
 642   // This gets called for each round-trip.  Only require identity on
 643   // the first call (when auth_data_ is empty).  On subsequent calls,
 644   // we use the initially established identity.
 645   return auth_data_.empty();
 646 }
 647
 648 bool HttpAuthHandlerNTLM::AllowsDefaultCredentials() {
 649   // Default credentials are not supported in the portable implementation of
 650   // NTLM, but are supported in the SSPI implementation.
 651   return false;
 652 }
 653
 654 int HttpAuthHandlerNTLM::InitializeBeforeFirstChallenge() {
 655   return OK;
 656 }
 657
 658 HttpAuthHandlerNTLM::~HttpAuthHandlerNTLM() {
 659   credentials_.Zap();
 660 }
 661
 662 // static
 663 HttpAuthHandlerNTLM::GenerateRandomProc
 664 HttpAuthHandlerNTLM::SetGenerateRandomProc(
 665     GenerateRandomProc proc) {
 666   GenerateRandomProc old_proc = generate_random_proc_;
 667   generate_random_proc_ = proc;
 668   return old_proc;
 669 }
 670
 671 // static
 672 HttpAuthHandlerNTLM::HostNameProc HttpAuthHandlerNTLM::SetHostNameProc(
 673     HostNameProc proc) {
 674   HostNameProc old_proc = get_host_name_proc_;
 675   get_host_name_proc_ = proc;
 676   return old_proc;
 677 }
 678
 679 HttpAuthHandlerNTLM::Factory::Factory() {
 680 }
 681
 682 HttpAuthHandlerNTLM::Factory::~Factory() {
 683 }
 684
 685 int HttpAuthHandlerNTLM::GetNextToken(const void* in_token,
 686                                       uint32 in_token_len,
 687                                       void** out_token,
 688                                       uint32* out_token_len) {
 689   int rv = 0;
 690
 691   // If in_token is non-null, then assume it contains a type 2 message...
 692   if (in_token) {
 693     LogToken("in-token", in_token, in_token_len);
 694     std::string hostname = get_host_name_proc_();
 695     if (hostname.empty())
 696       return ERR_UNEXPECTED;
 697     uint8 rand_buf[8];
 698     generate_random_proc_(rand_buf, 8);
 699     rv = GenerateType3Msg(domain_,
 700                           credentials_.username(), credentials_.password(),
 701                           hostname, rand_buf,
 702                           in_token, in_token_len, out_token, out_token_len);
 703   } else {
 704     rv = GenerateType1Msg(out_token, out_token_len);
 705   }
 706
 707   if (rv == OK)
 708     LogToken("out-token", *out_token, *out_token_len);
 709
 710   return rv;
 711 }
 712
 713 int HttpAuthHandlerNTLM::Factory::CreateAuthHandler(
 714     HttpAuthChallengeTokenizer* challenge,
 715     HttpAuth::Target target,
 716     const GURL& origin,
 717     CreateReason reason,
 718     int digest_nonce_count,
 719     const BoundNetLog& net_log,
 720     scoped_ptr<HttpAuthHandler>* handler) {
 721   if (reason == CREATE_PREEMPTIVE)
 722     return ERR_UNSUPPORTED_AUTH_SCHEME;
 723   // TODO(cbentzel): Move towards model of parsing in the factory
 724   //                 method and only constructing when valid.
 725   // NOTE: Default credentials are not supported for the portable implementation
 726   // of NTLM.
 727   scoped_ptr<HttpAuthHandler> tmp_handler(new HttpAuthHandlerNTLM);
 728   if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
 729     return ERR_INVALID_RESPONSE;
 730   handler->swap(tmp_handler);
 731   return OK;
 732 }
 733
 734 }  // namespace net