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      1 // Copyright (c) 2011 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 #if !defined(NTLM_SSPI)
      8 #include "base/base64.h"
      9 #endif
     10 #include "base/logging.h"
     11 #include "base/strings/string_util.h"
     12 #include "base/strings/utf_string_conversions.h"
     13 #include "net/base/net_errors.h"
     14 #include "net/base/net_util.h"
     15 
     16 namespace net {
     17 
     18 HttpAuth::AuthorizationResult HttpAuthHandlerNTLM::HandleAnotherChallenge(
     19     HttpAuth::ChallengeTokenizer* challenge) {
     20   return ParseChallenge(challenge, false);
     21 }
     22 
     23 bool HttpAuthHandlerNTLM::Init(HttpAuth::ChallengeTokenizer* tok) {
     24   auth_scheme_ = HttpAuth::AUTH_SCHEME_NTLM;
     25   score_ = 3;
     26   properties_ = ENCRYPTS_IDENTITY | IS_CONNECTION_BASED;
     27 
     28   return ParseChallenge(tok, true) == HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
     29 }
     30 
     31 int HttpAuthHandlerNTLM::GenerateAuthTokenImpl(
     32     const AuthCredentials* credentials, const HttpRequestInfo* request,
     33     const CompletionCallback& callback, std::string* auth_token) {
     34 #if defined(NTLM_SSPI)
     35   return auth_sspi_.GenerateAuthToken(
     36       credentials,
     37       CreateSPN(origin_),
     38       auth_token);
     39 #else  // !defined(NTLM_SSPI)
     40   // TODO(cbentzel): Shouldn't be hitting this case.
     41   if (!credentials) {
     42     LOG(ERROR) << "Username and password are expected to be non-NULL.";
     43     return ERR_MISSING_AUTH_CREDENTIALS;
     44   }
     45   // TODO(wtc): See if we can use char* instead of void* for in_buf and
     46   // out_buf.  This change will need to propagate to GetNextToken,
     47   // GenerateType1Msg, and GenerateType3Msg, and perhaps further.
     48   const void* in_buf;
     49   void* out_buf;
     50   uint32 in_buf_len, out_buf_len;
     51   std::string decoded_auth_data;
     52 
     53   // The username may be in the form "DOMAIN\user".  Parse it into the two
     54   // components.
     55   base::string16 domain;
     56   base::string16 user;
     57   const base::string16& username = credentials->username();
     58   const base::char16 backslash_character = '\\';
     59   size_t backslash_idx = username.find(backslash_character);
     60   if (backslash_idx == base::string16::npos) {
     61     user = username;
     62   } else {
     63     domain = username.substr(0, backslash_idx);
     64     user = username.substr(backslash_idx + 1);
     65   }
     66   domain_ = domain;
     67   credentials_.Set(user, credentials->password());
     68 
     69   // Initial challenge.
     70   if (auth_data_.empty()) {
     71     in_buf_len = 0;
     72     in_buf = NULL;
     73     int rv = InitializeBeforeFirstChallenge();
     74     if (rv != OK)
     75       return rv;
     76   } else {
     77     if (!base::Base64Decode(auth_data_, &decoded_auth_data)) {
     78       LOG(ERROR) << "Unexpected problem Base64 decoding.";
     79       return ERR_UNEXPECTED;
     80     }
     81     in_buf_len = decoded_auth_data.length();
     82     in_buf = decoded_auth_data.data();
     83   }
     84 
     85   int rv = GetNextToken(in_buf, in_buf_len, &out_buf, &out_buf_len);
     86   if (rv != OK)
     87     return rv;
     88 
     89   // Base64 encode data in output buffer and prepend "NTLM ".
     90   std::string encode_input(static_cast<char*>(out_buf), out_buf_len);
     91   std::string encode_output;
     92   bool base64_rv = base::Base64Encode(encode_input, &encode_output);
     93   // OK, we are done with |out_buf|
     94   free(out_buf);
     95   if (!base64_rv) {
     96     LOG(ERROR) << "Unexpected problem Base64 encoding.";
     97     return ERR_UNEXPECTED;
     98   }
     99   *auth_token = std::string("NTLM ") + encode_output;
    100   return OK;
    101 #endif
    102 }
    103 
    104 // The NTLM challenge header looks like:
    105 //   WWW-Authenticate: NTLM auth-data
    106 HttpAuth::AuthorizationResult HttpAuthHandlerNTLM::ParseChallenge(
    107     HttpAuth::ChallengeTokenizer* tok, bool initial_challenge) {
    108 #if defined(NTLM_SSPI)
    109   // auth_sspi_ contains state for whether or not this is the initial challenge.
    110   return auth_sspi_.ParseChallenge(tok);
    111 #else
    112   // TODO(cbentzel): Most of the logic between SSPI, GSSAPI, and portable NTLM
    113   // authentication parsing could probably be shared - just need to know if
    114   // there was previously a challenge round.
    115   // TODO(cbentzel): Write a test case to validate that auth_data_ is left empty
    116   // in all failure conditions.
    117   auth_data_.clear();
    118 
    119   // Verify the challenge's auth-scheme.
    120   if (!LowerCaseEqualsASCII(tok->scheme(), "ntlm"))
    121     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
    122 
    123   std::string base64_param = tok->base64_param();
    124   if (base64_param.empty()) {
    125     if (!initial_challenge)
    126       return HttpAuth::AUTHORIZATION_RESULT_REJECT;
    127     return HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
    128   } else {
    129     if (initial_challenge)
    130       return HttpAuth::AUTHORIZATION_RESULT_INVALID;
    131   }
    132 
    133   auth_data_ = base64_param;
    134   return HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
    135 #endif  // defined(NTLM_SSPI)
    136 }
    137 
    138 // static
    139 std::wstring HttpAuthHandlerNTLM::CreateSPN(const GURL& origin) {
    140   // The service principal name of the destination server.  See
    141   // http://msdn.microsoft.com/en-us/library/ms677949%28VS.85%29.aspx
    142   std::wstring target(L"HTTP/");
    143   target.append(ASCIIToWide(GetHostAndPort(origin)));
    144   return target;
    145 }
    146 
    147 }  // namespace net
    148