chrome/utility/importer/nss_decryptor.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 "chrome/utility/importer/nss_decryptor.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/base64.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/strings/string_split.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "components/autofill/core/common/password_form.h"
  16 #include "sql/connection.h"
  17 #include "sql/statement.h"
  18
  19 #if defined(USE_NSS_CERTS)
  20 #include <pk11pub.h>
  21 #include <pk11sdr.h>
  22 #endif  // defined(USE_NSS_CERTS)
  23
  24 // This method is based on some Firefox code in
  25 //   security/manager/ssl/src/nsSDR.cpp
  26 // The license block is:
  27
  28 /* ***** BEGIN LICENSE BLOCK *****
  29 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  30 *
  31 * The contents of this file are subject to the Mozilla Public License Version
  32 * 1.1 (the "License"); you may not use this file except in compliance with
  33 * the License. You may obtain a copy of the License at
  34 * http://www.mozilla.org/MPL/
  35 *
  36 * Software distributed under the License is distributed on an "AS IS" basis,
  37 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  38 * for the specific language governing rights and limitations under the
  39 * License.
  40 *
  41 * The Original Code is the Netscape security libraries.
  42 *
  43 * The Initial Developer of the Original Code is
  44 * Netscape Communications Corporation.
  45 * Portions created by the Initial Developer are Copyright (C) 1994-2000
  46 * the Initial Developer. All Rights Reserved.
  47 *
  48 * Contributor(s):
  49 *
  50 * Alternatively, the contents of this file may be used under the terms of
  51 * either the GNU General Public License Version 2 or later (the "GPL"), or
  52 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  53 * in which case the provisions of the GPL or the LGPL are applicable instead
  54 * of those above. If you wish to allow use of your version of this file only
  55 * under the terms of either the GPL or the LGPL, and not to allow others to
  56 * use your version of this file under the terms of the MPL, indicate your
  57 * decision by deleting the provisions above and replace them with the notice
  58 * and other provisions required by the GPL or the LGPL. If you do not delete
  59 * the provisions above, a recipient may use your version of this file under
  60 * the terms of any one of the MPL, the GPL or the LGPL.
  61 *
  62 * ***** END LICENSE BLOCK ***** */
  63
  64 base::string16 NSSDecryptor::Decrypt(const std::string& crypt) const {
  65   // Do nothing if NSS is not loaded.
  66   if (!is_nss_initialized_)
  67     return base::string16();
  68
  69   if (crypt.empty())
  70     return base::string16();
  71
  72   // The old style password is encoded in base64. They are identified
  73   // by a leading '~'. Otherwise, we should decrypt the text.
  74   std::string plain;
  75   if (crypt[0] != '~') {
  76     std::string decoded_data;
  77     if (!base::Base64Decode(crypt, &decoded_data))
  78       return base::string16();
  79     PK11SlotInfo* slot = GetKeySlotForDB();
  80     SECStatus result = PK11_Authenticate(slot, PR_TRUE, NULL);
  81     if (result != SECSuccess) {
  82       FreeSlot(slot);
  83       return base::string16();
  84     }
  85
  86     SECItem request;
  87     request.data = reinterpret_cast<unsigned char*>(
  88         const_cast<char*>(decoded_data.data()));
  89     request.len = static_cast<unsigned int>(decoded_data.size());
  90     SECItem reply;
  91     reply.data = NULL;
  92     reply.len = 0;
  93 #if defined(USE_NSS_CERTS)
  94     result = PK11SDR_DecryptWithSlot(slot, &request, &reply, NULL);
  95 #else
  96     result = PK11SDR_Decrypt(&request, &reply, NULL);
  97 #endif  // defined(USE_NSS_CERTS)
  98     if (result == SECSuccess)
  99       plain.assign(reinterpret_cast<char*>(reply.data), reply.len);
 100
 101     SECITEM_FreeItem(&reply, PR_FALSE);
 102     FreeSlot(slot);
 103   } else {
 104     // Deletes the leading '~' before decoding.
 105     if (!base::Base64Decode(crypt.substr(1), &plain))
 106       return base::string16();
 107   }
 108
 109   return base::UTF8ToUTF16(plain);
 110 }
 111
 112 // There are three versions of password files. They store saved user
 113 // names and passwords.
 114 // References:
 115 // http://kb.mozillazine.org/Signons.txt
 116 // http://kb.mozillazine.org/Signons2.txt
 117 // http://kb.mozillazine.org/Signons3.txt
 118 void NSSDecryptor::ParseSignons(
 119     const std::string& content,
 120     std::vector<autofill::PasswordForm>* forms) {
 121   forms->clear();
 122
 123   // Splits the file content into lines.
 124   std::vector<std::string> lines;
 125   base::SplitString(content, '\n', &lines);
 126
 127   // The first line is the file version. We skip the unknown versions.
 128   if (lines.empty())
 129     return;
 130   int version;
 131   if (lines[0] == "#2c")
 132     version = 1;
 133   else if (lines[0] == "#2d")
 134     version = 2;
 135   else if (lines[0] == "#2e")
 136     version = 3;
 137   else
 138     return;
 139
 140   GURL::Replacements rep;
 141   rep.ClearQuery();
 142   rep.ClearRef();
 143   rep.ClearUsername();
 144   rep.ClearPassword();
 145
 146   // Reads never-saved list. Domains are stored one per line.
 147   size_t i;
 148   for (i = 1; i < lines.size() && lines[i].compare(".") != 0; ++i) {
 149     autofill::PasswordForm form;
 150     form.origin = GURL(lines[i]).ReplaceComponents(rep);
 151     form.signon_realm = form.origin.GetOrigin().spec();
 152     form.blacklisted_by_user = true;
 153     forms->push_back(form);
 154   }
 155   ++i;
 156
 157   // Reads saved passwords. The information is stored in blocks
 158   // seperated by lines that only contain a dot. We find a block
 159   // by the seperator and parse them one by one.
 160   while (i < lines.size()) {
 161     size_t begin = i;
 162     size_t end = i + 1;
 163     while (end < lines.size() && lines[end].compare(".") != 0)
 164       ++end;
 165     i = end + 1;
 166
 167     // A block has at least five lines.
 168     if (end - begin < 5)
 169       continue;
 170
 171     autofill::PasswordForm form;
 172
 173     // The first line is the site URL.
 174     // For HTTP authentication logins, the URL may contain http realm,
 175     // which will be in bracket:
 176     //   sitename:8080 (realm)
 177     GURL url;
 178     std::string realm;
 179     const char kRealmBracketBegin[] = " (";
 180     const char kRealmBracketEnd[] = ")";
 181     if (lines[begin].find(kRealmBracketBegin) != std::string::npos) {
 182       // In this case, the scheme may not exsit. We assume that the
 183       // scheme is HTTP.
 184       if (lines[begin].find("://") == std::string::npos)
 185         lines[begin] = "http://" + lines[begin];
 186
 187       size_t start = lines[begin].find(kRealmBracketBegin);
 188       url = GURL(lines[begin].substr(0, start));
 189
 190       start += std::string(kRealmBracketBegin).size();
 191       size_t end = lines[begin].rfind(kRealmBracketEnd);
 192       realm = lines[begin].substr(start, end - start);
 193     } else {
 194       // Don't have http realm. It is the URL that the following passwords
 195       // belong to.
 196       url = GURL(lines[begin]);
 197     }
 198     // Skips this block if the URL is not valid.
 199     if (!url.is_valid())
 200       continue;
 201     form.origin = url.ReplaceComponents(rep);
 202     form.signon_realm = form.origin.GetOrigin().spec();
 203     if (!realm.empty())
 204       form.signon_realm += realm;
 205     form.ssl_valid = form.origin.SchemeIsCryptographic();
 206     ++begin;
 207
 208     // There may be multiple username/password pairs for this site.
 209     // In this case, they are saved in one block without a seperated
 210     // line (contains a dot).
 211     while (begin + 4 < end) {
 212       // The user name.
 213       form.username_element = base::UTF8ToUTF16(lines[begin++]);
 214       form.username_value = Decrypt(lines[begin++]);
 215       // The element name has a leading '*'.
 216       if (lines[begin].at(0) == '*') {
 217         form.password_element = base::UTF8ToUTF16(lines[begin++].substr(1));
 218         form.password_value = Decrypt(lines[begin++]);
 219       } else {
 220         // Maybe the file is bad, we skip to next block.
 221         break;
 222       }
 223       // The action attribute from the form element. This line exists
 224       // in versin 2 or above.
 225       if (version >= 2) {
 226         if (begin < end)
 227           form.action = GURL(lines[begin]).ReplaceComponents(rep);
 228         ++begin;
 229       }
 230       // Version 3 has an extra line for further use.
 231       if (version == 3) {
 232         ++begin;
 233       }
 234
 235       forms->push_back(form);
 236     }
 237   }
 238 }
 239
 240 bool NSSDecryptor::ReadAndParseSignons(const base::FilePath& sqlite_file,
 241     std::vector<autofill::PasswordForm>* forms) {
 242   sql::Connection db;
 243   if (!db.Open(sqlite_file))
 244     return false;
 245
 246   const char query[] = "SELECT hostname FROM moz_disabledHosts";
 247   sql::Statement s(db.GetUniqueStatement(query));
 248   if (!s.is_valid())
 249     return false;
 250
 251   GURL::Replacements rep;
 252   rep.ClearQuery();
 253   rep.ClearRef();
 254   rep.ClearUsername();
 255   rep.ClearPassword();
 256   // Read domains for which passwords are never saved.
 257   while (s.Step()) {
 258     autofill::PasswordForm form;
 259     form.origin = GURL(s.ColumnString(0)).ReplaceComponents(rep);
 260     form.signon_realm = form.origin.GetOrigin().spec();
 261     form.blacklisted_by_user = true;
 262     forms->push_back(form);
 263   }
 264
 265   const char query2[] = "SELECT hostname, httpRealm, formSubmitURL, "
 266                         "usernameField, passwordField, encryptedUsername, "
 267                         "encryptedPassword FROM moz_logins";
 268
 269   sql::Statement s2(db.GetUniqueStatement(query2));
 270   if (!s2.is_valid())
 271     return false;
 272
 273   while (s2.Step()) {
 274     GURL url;
 275     std::string realm(s2.ColumnString(1));
 276     if (!realm.empty()) {
 277       // In this case, the scheme may not exsit. Assume HTTP.
 278       std::string host(s2.ColumnString(0));
 279       if (host.find("://") == std::string::npos)
 280         host = "http://" + host;
 281       url = GURL(host);
 282     } else {
 283       url = GURL(s2.ColumnString(0));
 284     }
 285     // Skip this row if the URL is not valid.
 286     if (!url.is_valid())
 287       continue;
 288
 289     autofill::PasswordForm form;
 290     form.origin = url.ReplaceComponents(rep);
 291     form.signon_realm = form.origin.GetOrigin().spec();
 292     if (!realm.empty()) {
 293       form.signon_realm += realm;
 294       // Non-empty realm indicates that it's not html form authentication entry.
 295       // Extracted data doesn't allow us to distinguish basic_auth entry from
 296       // digest_auth entry, so let's assume basic_auth.
 297       form.scheme = autofill::PasswordForm::SCHEME_BASIC;
 298     }
 299     form.ssl_valid = form.origin.SchemeIsCryptographic();
 300     // The user name, password and action.
 301     form.username_element = s2.ColumnString16(3);
 302     form.username_value = Decrypt(s2.ColumnString(5));
 303     form.password_element = s2.ColumnString16(4);
 304     form.password_value = Decrypt(s2.ColumnString(6));
 305     form.action = GURL(s2.ColumnString(2)).ReplaceComponents(rep);
 306     forms->push_back(form);
 307   }
 308   return true;
 309 }