src/net/http/transport_security_state.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/transport_security_state.h"
   6
   7 #if defined(USE_OPENSSL)
   8 #include <openssl/ecdsa.h>
   9 #include <openssl/ssl.h>
  10 #else  // !defined(USE_OPENSSL)
  11 #include <cryptohi.h>
  12 #include <hasht.h>
  13 #include <keyhi.h>
  14 #include <nspr.h>
  15 #include <pk11pub.h>
  16 #endif
  17
  18 #include <algorithm>
  19
  20 #include "base/base64.h"
  21 #include "base/build_time.h"
  22 #include "base/logging.h"
  23 #include "base/memory/scoped_ptr.h"
  24 #include "base/metrics/histogram.h"
  25 #include "base/sha1.h"
  26 #include "base/strings/string_number_conversions.h"
  27 #include "base/strings/string_util.h"
  28 #include "base/strings/utf_string_conversions.h"
  29 #include "base/time/time.h"
  30 #include "base/values.h"
  31 #include "crypto/sha2.h"
  32 #include "net/base/dns_util.h"
  33 #include "net/cert/x509_cert_types.h"
  34 #include "net/cert/x509_certificate.h"
  35 #include "net/http/http_security_headers.h"
  36 #include "net/ssl/ssl_info.h"
  37 #include "url/gurl.h"
  38
  39 #if defined(USE_OPENSSL)
  40 #include "crypto/openssl_util.h"
  41 #endif
  42
  43 namespace net {
  44
  45 namespace {
  46
  47 std::string HashesToBase64String(const HashValueVector& hashes) {
  48   std::string str;
  49   for (size_t i = 0; i != hashes.size(); ++i) {
  50     if (i != 0)
  51       str += ",";
  52     str += hashes[i].ToString();
  53   }
  54   return str;
  55 }
  56
  57 std::string HashHost(const std::string& canonicalized_host) {
  58   char hashed[crypto::kSHA256Length];
  59   crypto::SHA256HashString(canonicalized_host, hashed, sizeof(hashed));
  60   return std::string(hashed, sizeof(hashed));
  61 }
  62
  63 // Returns true if the intersection of |a| and |b| is not empty. If either
  64 // |a| or |b| is empty, returns false.
  65 bool HashesIntersect(const HashValueVector& a,
  66                      const HashValueVector& b) {
  67   for (HashValueVector::const_iterator i = a.begin(); i != a.end(); ++i) {
  68     HashValueVector::const_iterator j =
  69         std::find_if(b.begin(), b.end(), HashValuesEqual(*i));
  70     if (j != b.end())
  71       return true;
  72   }
  73   return false;
  74 }
  75
  76 bool AddHash(const char* sha1_hash,
  77              HashValueVector* out) {
  78   HashValue hash(HASH_VALUE_SHA1);
  79   memcpy(hash.data(), sha1_hash, hash.size());
  80   out->push_back(hash);
  81   return true;
  82 }
  83
  84 }  // namespace
  85
  86 TransportSecurityState::TransportSecurityState()
  87   : delegate_(NULL) {
  88   DCHECK(CalledOnValidThread());
  89 }
  90
  91 TransportSecurityState::Iterator::Iterator(const TransportSecurityState& state)
  92     : iterator_(state.enabled_hosts_.begin()),
  93       end_(state.enabled_hosts_.end()) {
  94 }
  95
  96 TransportSecurityState::Iterator::~Iterator() {}
  97
  98 void TransportSecurityState::SetDelegate(
  99     TransportSecurityState::Delegate* delegate) {
 100   DCHECK(CalledOnValidThread());
 101   delegate_ = delegate;
 102 }
 103
 104 void TransportSecurityState::EnableHost(const std::string& host,
 105                                         const DomainState& state) {
 106   DCHECK(CalledOnValidThread());
 107
 108   const std::string canonicalized_host = CanonicalizeHost(host);
 109   if (canonicalized_host.empty())
 110     return;
 111
 112   DomainState state_copy(state);
 113   // No need to store this value since it is redundant. (|canonicalized_host|
 114   // is the map key.)
 115   state_copy.domain.clear();
 116
 117   enabled_hosts_[HashHost(canonicalized_host)] = state_copy;
 118   DirtyNotify();
 119 }
 120
 121 bool TransportSecurityState::DeleteDynamicDataForHost(const std::string& host) {
 122   DCHECK(CalledOnValidThread());
 123
 124   const std::string canonicalized_host = CanonicalizeHost(host);
 125   if (canonicalized_host.empty())
 126     return false;
 127
 128   DomainStateMap::iterator i = enabled_hosts_.find(
 129       HashHost(canonicalized_host));
 130   if (i != enabled_hosts_.end()) {
 131     enabled_hosts_.erase(i);
 132     DirtyNotify();
 133     return true;
 134   }
 135   return false;
 136 }
 137
 138 bool TransportSecurityState::GetDomainState(const std::string& host,
 139                                             bool sni_enabled,
 140                                             DomainState* result) {
 141   DCHECK(CalledOnValidThread());
 142
 143   DomainState state;
 144   const std::string canonicalized_host = CanonicalizeHost(host);
 145   if (canonicalized_host.empty())
 146     return false;
 147
 148   bool has_preload = GetStaticDomainState(canonicalized_host, sni_enabled,
 149                                           &state);
 150   std::string canonicalized_preload = CanonicalizeHost(state.domain);
 151   GetDynamicDomainState(host, &state);
 152
 153   base::Time current_time(base::Time::Now());
 154
 155   for (size_t i = 0; canonicalized_host[i]; i += canonicalized_host[i] + 1) {
 156     std::string host_sub_chunk(&canonicalized_host[i],
 157                                canonicalized_host.size() - i);
 158     // Exact match of a preload always wins.
 159     if (has_preload && host_sub_chunk == canonicalized_preload) {
 160       *result = state;
 161       return true;
 162     }
 163
 164     DomainStateMap::iterator j =
 165         enabled_hosts_.find(HashHost(host_sub_chunk));
 166     if (j == enabled_hosts_.end())
 167       continue;
 168
 169     if (current_time > j->second.upgrade_expiry &&
 170         current_time > j->second.dynamic_spki_hashes_expiry) {
 171       enabled_hosts_.erase(j);
 172       DirtyNotify();
 173       continue;
 174     }
 175
 176     state = j->second;
 177     state.domain = DNSDomainToString(host_sub_chunk);
 178
 179     // Succeed if we matched the domain exactly or if subdomain matches are
 180     // allowed.
 181     if (i == 0 || j->second.sts_include_subdomains ||
 182         j->second.pkp_include_subdomains) {
 183       *result = state;
 184       return true;
 185     }
 186
 187     return false;
 188   }
 189
 190   return false;
 191 }
 192
 193 void TransportSecurityState::ClearDynamicData() {
 194   DCHECK(CalledOnValidThread());
 195   enabled_hosts_.clear();
 196 }
 197
 198 void TransportSecurityState::DeleteAllDynamicDataSince(const base::Time& time) {
 199   DCHECK(CalledOnValidThread());
 200
 201   bool dirtied = false;
 202   DomainStateMap::iterator i = enabled_hosts_.begin();
 203   while (i != enabled_hosts_.end()) {
 204     if (i->second.sts_observed >= time && i->second.pkp_observed >= time) {
 205       dirtied = true;
 206       enabled_hosts_.erase(i++);
 207       continue;
 208     }
 209
 210     if (i->second.sts_observed >= time) {
 211       dirtied = true;
 212       i->second.upgrade_mode = DomainState::MODE_DEFAULT;
 213     } else if (i->second.pkp_observed >= time) {
 214       dirtied = true;
 215       i->second.dynamic_spki_hashes.clear();
 216     }
 217     ++i;
 218   }
 219
 220   if (dirtied)
 221     DirtyNotify();
 222 }
 223
 224 TransportSecurityState::~TransportSecurityState() {
 225   DCHECK(CalledOnValidThread());
 226 }
 227
 228 void TransportSecurityState::DirtyNotify() {
 229   DCHECK(CalledOnValidThread());
 230
 231   if (delegate_)
 232     delegate_->StateIsDirty(this);
 233 }
 234
 235 // static
 236 std::string TransportSecurityState::CanonicalizeHost(const std::string& host) {
 237   // We cannot perform the operations as detailed in the spec here as |host|
 238   // has already undergone IDN processing before it reached us. Thus, we check
 239   // that there are no invalid characters in the host and lowercase the result.
 240
 241   std::string new_host;
 242   if (!DNSDomainFromDot(host, &new_host)) {
 243     // DNSDomainFromDot can fail if any label is > 63 bytes or if the whole
 244     // name is >255 bytes. However, search terms can have those properties.
 245     return std::string();
 246   }
 247
 248   for (size_t i = 0; new_host[i]; i += new_host[i] + 1) {
 249     const unsigned label_length = static_cast<unsigned>(new_host[i]);
 250     if (!label_length)
 251       break;
 252
 253     for (size_t j = 0; j < label_length; ++j) {
 254       new_host[i + 1 + j] = tolower(new_host[i + 1 + j]);
 255     }
 256   }
 257
 258   return new_host;
 259 }
 260
 261 // |ReportUMAOnPinFailure| uses these to report which domain was associated
 262 // with the public key pinning failure.
 263 //
 264 // DO NOT CHANGE THE ORDERING OF THESE NAMES OR REMOVE ANY OF THEM. Add new
 265 // domains at the END of the listing (but before DOMAIN_NUM_EVENTS).
 266 enum SecondLevelDomainName {
 267   DOMAIN_NOT_PINNED,
 268
 269   DOMAIN_GOOGLE_COM,
 270   DOMAIN_ANDROID_COM,
 271   DOMAIN_GOOGLE_ANALYTICS_COM,
 272   DOMAIN_GOOGLEPLEX_COM,
 273   DOMAIN_YTIMG_COM,
 274   DOMAIN_GOOGLEUSERCONTENT_COM,
 275   DOMAIN_YOUTUBE_COM,
 276   DOMAIN_GOOGLEAPIS_COM,
 277   DOMAIN_GOOGLEADSERVICES_COM,
 278   DOMAIN_GOOGLECODE_COM,
 279   DOMAIN_APPSPOT_COM,
 280   DOMAIN_GOOGLESYNDICATION_COM,
 281   DOMAIN_DOUBLECLICK_NET,
 282   DOMAIN_GSTATIC_COM,
 283   DOMAIN_GMAIL_COM,
 284   DOMAIN_GOOGLEMAIL_COM,
 285   DOMAIN_GOOGLEGROUPS_COM,
 286
 287   DOMAIN_TORPROJECT_ORG,
 288
 289   DOMAIN_TWITTER_COM,
 290   DOMAIN_TWIMG_COM,
 291
 292   DOMAIN_AKAMAIHD_NET,
 293
 294   DOMAIN_TOR2WEB_ORG,
 295
 296   DOMAIN_YOUTU_BE,
 297   DOMAIN_GOOGLECOMMERCE_COM,
 298   DOMAIN_URCHIN_COM,
 299   DOMAIN_GOO_GL,
 300   DOMAIN_G_CO,
 301   DOMAIN_GOOGLE_AC,
 302   DOMAIN_GOOGLE_AD,
 303   DOMAIN_GOOGLE_AE,
 304   DOMAIN_GOOGLE_AF,
 305   DOMAIN_GOOGLE_AG,
 306   DOMAIN_GOOGLE_AM,
 307   DOMAIN_GOOGLE_AS,
 308   DOMAIN_GOOGLE_AT,
 309   DOMAIN_GOOGLE_AZ,
 310   DOMAIN_GOOGLE_BA,
 311   DOMAIN_GOOGLE_BE,
 312   DOMAIN_GOOGLE_BF,
 313   DOMAIN_GOOGLE_BG,
 314   DOMAIN_GOOGLE_BI,
 315   DOMAIN_GOOGLE_BJ,
 316   DOMAIN_GOOGLE_BS,
 317   DOMAIN_GOOGLE_BY,
 318   DOMAIN_GOOGLE_CA,
 319   DOMAIN_GOOGLE_CAT,
 320   DOMAIN_GOOGLE_CC,
 321   DOMAIN_GOOGLE_CD,
 322   DOMAIN_GOOGLE_CF,
 323   DOMAIN_GOOGLE_CG,
 324   DOMAIN_GOOGLE_CH,
 325   DOMAIN_GOOGLE_CI,
 326   DOMAIN_GOOGLE_CL,
 327   DOMAIN_GOOGLE_CM,
 328   DOMAIN_GOOGLE_CN,
 329   DOMAIN_CO_AO,
 330   DOMAIN_CO_BW,
 331   DOMAIN_CO_CK,
 332   DOMAIN_CO_CR,
 333   DOMAIN_CO_HU,
 334   DOMAIN_CO_ID,
 335   DOMAIN_CO_IL,
 336   DOMAIN_CO_IM,
 337   DOMAIN_CO_IN,
 338   DOMAIN_CO_JE,
 339   DOMAIN_CO_JP,
 340   DOMAIN_CO_KE,
 341   DOMAIN_CO_KR,
 342   DOMAIN_CO_LS,
 343   DOMAIN_CO_MA,
 344   DOMAIN_CO_MZ,
 345   DOMAIN_CO_NZ,
 346   DOMAIN_CO_TH,
 347   DOMAIN_CO_TZ,
 348   DOMAIN_CO_UG,
 349   DOMAIN_CO_UK,
 350   DOMAIN_CO_UZ,
 351   DOMAIN_CO_VE,
 352   DOMAIN_CO_VI,
 353   DOMAIN_CO_ZA,
 354   DOMAIN_CO_ZM,
 355   DOMAIN_CO_ZW,
 356   DOMAIN_COM_AF,
 357   DOMAIN_COM_AG,
 358   DOMAIN_COM_AI,
 359   DOMAIN_COM_AR,
 360   DOMAIN_COM_AU,
 361   DOMAIN_COM_BD,
 362   DOMAIN_COM_BH,
 363   DOMAIN_COM_BN,
 364   DOMAIN_COM_BO,
 365   DOMAIN_COM_BR,
 366   DOMAIN_COM_BY,
 367   DOMAIN_COM_BZ,
 368   DOMAIN_COM_CN,
 369   DOMAIN_COM_CO,
 370   DOMAIN_COM_CU,
 371   DOMAIN_COM_CY,
 372   DOMAIN_COM_DO,
 373   DOMAIN_COM_EC,
 374   DOMAIN_COM_EG,
 375   DOMAIN_COM_ET,
 376   DOMAIN_COM_FJ,
 377   DOMAIN_COM_GE,
 378   DOMAIN_COM_GH,
 379   DOMAIN_COM_GI,
 380   DOMAIN_COM_GR,
 381   DOMAIN_COM_GT,
 382   DOMAIN_COM_HK,
 383   DOMAIN_COM_IQ,
 384   DOMAIN_COM_JM,
 385   DOMAIN_COM_JO,
 386   DOMAIN_COM_KH,
 387   DOMAIN_COM_KW,
 388   DOMAIN_COM_LB,
 389   DOMAIN_COM_LY,
 390   DOMAIN_COM_MT,
 391   DOMAIN_COM_MX,
 392   DOMAIN_COM_MY,
 393   DOMAIN_COM_NA,
 394   DOMAIN_COM_NF,
 395   DOMAIN_COM_NG,
 396   DOMAIN_COM_NI,
 397   DOMAIN_COM_NP,
 398   DOMAIN_COM_NR,
 399   DOMAIN_COM_OM,
 400   DOMAIN_COM_PA,
 401   DOMAIN_COM_PE,
 402   DOMAIN_COM_PH,
 403   DOMAIN_COM_PK,
 404   DOMAIN_COM_PL,
 405   DOMAIN_COM_PR,
 406   DOMAIN_COM_PY,
 407   DOMAIN_COM_QA,
 408   DOMAIN_COM_RU,
 409   DOMAIN_COM_SA,
 410   DOMAIN_COM_SB,
 411   DOMAIN_COM_SG,
 412   DOMAIN_COM_SL,
 413   DOMAIN_COM_SV,
 414   DOMAIN_COM_TJ,
 415   DOMAIN_COM_TN,
 416   DOMAIN_COM_TR,
 417   DOMAIN_COM_TW,
 418   DOMAIN_COM_UA,
 419   DOMAIN_COM_UY,
 420   DOMAIN_COM_VC,
 421   DOMAIN_COM_VE,
 422   DOMAIN_COM_VN,
 423   DOMAIN_GOOGLE_CV,
 424   DOMAIN_GOOGLE_CZ,
 425   DOMAIN_GOOGLE_DE,
 426   DOMAIN_GOOGLE_DJ,
 427   DOMAIN_GOOGLE_DK,
 428   DOMAIN_GOOGLE_DM,
 429   DOMAIN_GOOGLE_DZ,
 430   DOMAIN_GOOGLE_EE,
 431   DOMAIN_GOOGLE_ES,
 432   DOMAIN_GOOGLE_FI,
 433   DOMAIN_GOOGLE_FM,
 434   DOMAIN_GOOGLE_FR,
 435   DOMAIN_GOOGLE_GA,
 436   DOMAIN_GOOGLE_GE,
 437   DOMAIN_GOOGLE_GG,
 438   DOMAIN_GOOGLE_GL,
 439   DOMAIN_GOOGLE_GM,
 440   DOMAIN_GOOGLE_GP,
 441   DOMAIN_GOOGLE_GR,
 442   DOMAIN_GOOGLE_GY,
 443   DOMAIN_GOOGLE_HK,
 444   DOMAIN_GOOGLE_HN,
 445   DOMAIN_GOOGLE_HR,
 446   DOMAIN_GOOGLE_HT,
 447   DOMAIN_GOOGLE_HU,
 448   DOMAIN_GOOGLE_IE,
 449   DOMAIN_GOOGLE_IM,
 450   DOMAIN_GOOGLE_INFO,
 451   DOMAIN_GOOGLE_IQ,
 452   DOMAIN_GOOGLE_IS,
 453   DOMAIN_GOOGLE_IT,
 454   DOMAIN_IT_AO,
 455   DOMAIN_GOOGLE_JE,
 456   DOMAIN_GOOGLE_JO,
 457   DOMAIN_GOOGLE_JOBS,
 458   DOMAIN_GOOGLE_JP,
 459   DOMAIN_GOOGLE_KG,
 460   DOMAIN_GOOGLE_KI,
 461   DOMAIN_GOOGLE_KZ,
 462   DOMAIN_GOOGLE_LA,
 463   DOMAIN_GOOGLE_LI,
 464   DOMAIN_GOOGLE_LK,
 465   DOMAIN_GOOGLE_LT,
 466   DOMAIN_GOOGLE_LU,
 467   DOMAIN_GOOGLE_LV,
 468   DOMAIN_GOOGLE_MD,
 469   DOMAIN_GOOGLE_ME,
 470   DOMAIN_GOOGLE_MG,
 471   DOMAIN_GOOGLE_MK,
 472   DOMAIN_GOOGLE_ML,
 473   DOMAIN_GOOGLE_MN,
 474   DOMAIN_GOOGLE_MS,
 475   DOMAIN_GOOGLE_MU,
 476   DOMAIN_GOOGLE_MV,
 477   DOMAIN_GOOGLE_MW,
 478   DOMAIN_GOOGLE_NE,
 479   DOMAIN_NE_JP,
 480   DOMAIN_GOOGLE_NET,
 481   DOMAIN_GOOGLE_NL,
 482   DOMAIN_GOOGLE_NO,
 483   DOMAIN_GOOGLE_NR,
 484   DOMAIN_GOOGLE_NU,
 485   DOMAIN_OFF_AI,
 486   DOMAIN_GOOGLE_PK,
 487   DOMAIN_GOOGLE_PL,
 488   DOMAIN_GOOGLE_PN,
 489   DOMAIN_GOOGLE_PS,
 490   DOMAIN_GOOGLE_PT,
 491   DOMAIN_GOOGLE_RO,
 492   DOMAIN_GOOGLE_RS,
 493   DOMAIN_GOOGLE_RU,
 494   DOMAIN_GOOGLE_RW,
 495   DOMAIN_GOOGLE_SC,
 496   DOMAIN_GOOGLE_SE,
 497   DOMAIN_GOOGLE_SH,
 498   DOMAIN_GOOGLE_SI,
 499   DOMAIN_GOOGLE_SK,
 500   DOMAIN_GOOGLE_SM,
 501   DOMAIN_GOOGLE_SN,
 502   DOMAIN_GOOGLE_SO,
 503   DOMAIN_GOOGLE_ST,
 504   DOMAIN_GOOGLE_TD,
 505   DOMAIN_GOOGLE_TG,
 506   DOMAIN_GOOGLE_TK,
 507   DOMAIN_GOOGLE_TL,
 508   DOMAIN_GOOGLE_TM,
 509   DOMAIN_GOOGLE_TN,
 510   DOMAIN_GOOGLE_TO,
 511   DOMAIN_GOOGLE_TP,
 512   DOMAIN_GOOGLE_TT,
 513   DOMAIN_GOOGLE_US,
 514   DOMAIN_GOOGLE_UZ,
 515   DOMAIN_GOOGLE_VG,
 516   DOMAIN_GOOGLE_VU,
 517   DOMAIN_GOOGLE_WS,
 518
 519   DOMAIN_CHROMIUM_ORG,
 520
 521   DOMAIN_CRYPTO_CAT,
 522   DOMAIN_LAVABIT_COM,
 523
 524   DOMAIN_GOOGLETAGMANAGER_COM,
 525
 526   // Boundary value for UMA_HISTOGRAM_ENUMERATION:
 527   DOMAIN_NUM_EVENTS
 528 };
 529
 530 // PublicKeyPins contains a number of SubjectPublicKeyInfo hashes for a site.
 531 // The validated certificate chain for the site must not include any of
 532 // |excluded_hashes| and must include one or more of |required_hashes|.
 533 struct PublicKeyPins {
 534   const char* const* required_hashes;
 535   const char* const* excluded_hashes;
 536 };
 537
 538 struct HSTSPreload {
 539   uint8 length;
 540   bool include_subdomains;
 541   char dns_name[38];
 542   bool https_required;
 543   PublicKeyPins pins;
 544   SecondLevelDomainName second_level_domain_name;
 545 };
 546
 547 static bool HasPreload(const struct HSTSPreload* entries, size_t num_entries,
 548                        const std::string& canonicalized_host, size_t i,
 549                        TransportSecurityState::DomainState* out, bool* ret) {
 550   for (size_t j = 0; j < num_entries; j++) {
 551     if (entries[j].length == canonicalized_host.size() - i &&
 552         memcmp(entries[j].dns_name, &canonicalized_host[i],
 553                entries[j].length) == 0) {
 554       if (!entries[j].include_subdomains && i != 0) {
 555         *ret = false;
 556       } else {
 557         out->sts_include_subdomains = entries[j].include_subdomains;
 558         out->pkp_include_subdomains = entries[j].include_subdomains;
 559         *ret = true;
 560         if (!entries[j].https_required)
 561           out->upgrade_mode = TransportSecurityState::DomainState::MODE_DEFAULT;
 562         if (entries[j].pins.required_hashes) {
 563           const char* const* sha1_hash = entries[j].pins.required_hashes;
 564           while (*sha1_hash) {
 565             AddHash(*sha1_hash, &out->static_spki_hashes);
 566             sha1_hash++;
 567           }
 568         }
 569         if (entries[j].pins.excluded_hashes) {
 570           const char* const* sha1_hash = entries[j].pins.excluded_hashes;
 571           while (*sha1_hash) {
 572             AddHash(*sha1_hash, &out->bad_static_spki_hashes);
 573             sha1_hash++;
 574           }
 575         }
 576       }
 577       return true;
 578     }
 579   }
 580   return false;
 581 }
 582
 583 #include "net/http/transport_security_state_static.h"
 584
 585 // Returns the HSTSPreload entry for the |canonicalized_host| in |entries|,
 586 // or NULL if there is none. Prefers exact hostname matches to those that
 587 // match only because HSTSPreload.include_subdomains is true.
 588 //
 589 // |canonicalized_host| should be the hostname as canonicalized by
 590 // CanonicalizeHost.
 591 static const struct HSTSPreload* GetHSTSPreload(
 592     const std::string& canonicalized_host,
 593     const struct HSTSPreload* entries,
 594     size_t num_entries) {
 595   for (size_t i = 0; canonicalized_host[i]; i += canonicalized_host[i] + 1) {
 596     for (size_t j = 0; j < num_entries; j++) {
 597       const struct HSTSPreload* entry = entries + j;
 598
 599       if (i != 0 && !entry->include_subdomains)
 600         continue;
 601
 602       if (entry->length == canonicalized_host.size() - i &&
 603           memcmp(entry->dns_name, &canonicalized_host[i], entry->length) == 0) {
 604         return entry;
 605       }
 606     }
 607   }
 608
 609   return NULL;
 610 }
 611
 612 bool TransportSecurityState::AddHSTSHeader(const std::string& host,
 613                                            const std::string& value) {
 614   DCHECK(CalledOnValidThread());
 615
 616   base::Time now = base::Time::Now();
 617   base::TimeDelta max_age;
 618   TransportSecurityState::DomainState domain_state;
 619   GetDynamicDomainState(host, &domain_state);
 620   if (ParseHSTSHeader(value, &max_age, &domain_state.sts_include_subdomains)) {
 621     // Handle max-age == 0
 622     if (max_age.InSeconds() == 0)
 623       domain_state.upgrade_mode = DomainState::MODE_DEFAULT;
 624     else
 625       domain_state.upgrade_mode = DomainState::MODE_FORCE_HTTPS;
 626     domain_state.sts_observed = now;
 627     domain_state.upgrade_expiry = now + max_age;
 628     EnableHost(host, domain_state);
 629     return true;
 630   }
 631   return false;
 632 }
 633
 634 bool TransportSecurityState::AddHPKPHeader(const std::string& host,
 635                                            const std::string& value,
 636                                            const SSLInfo& ssl_info) {
 637   DCHECK(CalledOnValidThread());
 638
 639   base::Time now = base::Time::Now();
 640   base::TimeDelta max_age;
 641   TransportSecurityState::DomainState domain_state;
 642   GetDynamicDomainState(host, &domain_state);
 643   if (ParseHPKPHeader(value, ssl_info.public_key_hashes,
 644                       &max_age, &domain_state.pkp_include_subdomains,
 645                       &domain_state.dynamic_spki_hashes)) {
 646     // TODO(palmer): http://crbug.com/243865 handle max-age == 0.
 647     domain_state.pkp_observed = now;
 648     domain_state.dynamic_spki_hashes_expiry = now + max_age;
 649     EnableHost(host, domain_state);
 650     return true;
 651   }
 652   return false;
 653 }
 654
 655 bool TransportSecurityState::AddHSTS(const std::string& host,
 656                                      const base::Time& expiry,
 657                                      bool include_subdomains) {
 658   DCHECK(CalledOnValidThread());
 659
 660   // Copy-and-modify the existing DomainState for this host (if any).
 661   TransportSecurityState::DomainState domain_state;
 662   const std::string canonicalized_host = CanonicalizeHost(host);
 663   const std::string hashed_host = HashHost(canonicalized_host);
 664   DomainStateMap::const_iterator i = enabled_hosts_.find(
 665       hashed_host);
 666   if (i != enabled_hosts_.end())
 667     domain_state = i->second;
 668
 669   domain_state.sts_observed = base::Time::Now();
 670   domain_state.sts_include_subdomains = include_subdomains;
 671   domain_state.upgrade_expiry = expiry;
 672   domain_state.upgrade_mode = DomainState::MODE_FORCE_HTTPS;
 673   EnableHost(host, domain_state);
 674   return true;
 675 }
 676
 677 bool TransportSecurityState::AddHPKP(const std::string& host,
 678                                      const base::Time& expiry,
 679                                      bool include_subdomains,
 680                                      const HashValueVector& hashes) {
 681   DCHECK(CalledOnValidThread());
 682
 683   // Copy-and-modify the existing DomainState for this host (if any).
 684   TransportSecurityState::DomainState domain_state;
 685   const std::string canonicalized_host = CanonicalizeHost(host);
 686   const std::string hashed_host = HashHost(canonicalized_host);
 687   DomainStateMap::const_iterator i = enabled_hosts_.find(
 688       hashed_host);
 689   if (i != enabled_hosts_.end())
 690     domain_state = i->second;
 691
 692   domain_state.pkp_observed = base::Time::Now();
 693   domain_state.pkp_include_subdomains = include_subdomains;
 694   domain_state.dynamic_spki_hashes_expiry = expiry;
 695   domain_state.dynamic_spki_hashes = hashes;
 696   EnableHost(host, domain_state);
 697   return true;
 698 }
 699
 700 // static
 701 bool TransportSecurityState::IsGooglePinnedProperty(const std::string& host,
 702                                                     bool sni_enabled) {
 703   std::string canonicalized_host = CanonicalizeHost(host);
 704   const struct HSTSPreload* entry =
 705       GetHSTSPreload(canonicalized_host, kPreloadedSTS, kNumPreloadedSTS);
 706
 707   if (entry && entry->pins.required_hashes == kGoogleAcceptableCerts)
 708     return true;
 709
 710   if (sni_enabled) {
 711     entry = GetHSTSPreload(canonicalized_host, kPreloadedSNISTS,
 712                            kNumPreloadedSNISTS);
 713     if (entry && entry->pins.required_hashes == kGoogleAcceptableCerts)
 714       return true;
 715   }
 716
 717   return false;
 718 }
 719
 720 // static
 721 void TransportSecurityState::ReportUMAOnPinFailure(const std::string& host) {
 722   std::string canonicalized_host = CanonicalizeHost(host);
 723
 724   const struct HSTSPreload* entry =
 725       GetHSTSPreload(canonicalized_host, kPreloadedSTS, kNumPreloadedSTS);
 726
 727   if (!entry) {
 728     entry = GetHSTSPreload(canonicalized_host, kPreloadedSNISTS,
 729                            kNumPreloadedSNISTS);
 730   }
 731
 732   if (!entry) {
 733     // We don't care to report pin failures for dynamic pins.
 734     return;
 735   }
 736
 737   DCHECK(entry);
 738   DCHECK(entry->pins.required_hashes);
 739   DCHECK(entry->second_level_domain_name != DOMAIN_NOT_PINNED);
 740
 741   UMA_HISTOGRAM_ENUMERATION("Net.PublicKeyPinFailureDomain",
 742                             entry->second_level_domain_name, DOMAIN_NUM_EVENTS);
 743 }
 744
 745 // static
 746 bool TransportSecurityState::IsBuildTimely() {
 747   const base::Time build_time = base::GetBuildTime();
 748   // We consider built-in information to be timely for 10 weeks.
 749   return (base::Time::Now() - build_time).InDays() < 70 /* 10 weeks */;
 750 }
 751
 752 bool TransportSecurityState::GetStaticDomainState(
 753     const std::string& canonicalized_host,
 754     bool sni_enabled,
 755     DomainState* out) {
 756   DCHECK(CalledOnValidThread());
 757
 758   out->upgrade_mode = DomainState::MODE_FORCE_HTTPS;
 759   out->sts_include_subdomains = false;
 760   out->pkp_include_subdomains = false;
 761
 762   const bool is_build_timely = IsBuildTimely();
 763
 764   for (size_t i = 0; canonicalized_host[i]; i += canonicalized_host[i] + 1) {
 765     std::string host_sub_chunk(&canonicalized_host[i],
 766                                canonicalized_host.size() - i);
 767     out->domain = DNSDomainToString(host_sub_chunk);
 768     bool ret;
 769     if (is_build_timely &&
 770         HasPreload(kPreloadedSTS, kNumPreloadedSTS, canonicalized_host, i, out,
 771                    &ret)) {
 772       return ret;
 773     }
 774     if (sni_enabled &&
 775         is_build_timely &&
 776         HasPreload(kPreloadedSNISTS, kNumPreloadedSNISTS, canonicalized_host, i,
 777                    out, &ret)) {
 778       return ret;
 779     }
 780   }
 781
 782   return false;
 783 }
 784
 785 bool TransportSecurityState::GetDynamicDomainState(const std::string& host,
 786                                                    DomainState* result) {
 787   DCHECK(CalledOnValidThread());
 788
 789   DomainState state;
 790   const std::string canonicalized_host = CanonicalizeHost(host);
 791   if (canonicalized_host.empty())
 792     return false;
 793
 794   base::Time current_time(base::Time::Now());
 795
 796   for (size_t i = 0; canonicalized_host[i]; i += canonicalized_host[i] + 1) {
 797     std::string host_sub_chunk(&canonicalized_host[i],
 798                                canonicalized_host.size() - i);
 799     DomainStateMap::iterator j =
 800         enabled_hosts_.find(HashHost(host_sub_chunk));
 801     if (j == enabled_hosts_.end())
 802       continue;
 803
 804     if (current_time > j->second.upgrade_expiry &&
 805         current_time > j->second.dynamic_spki_hashes_expiry) {
 806       enabled_hosts_.erase(j);
 807       DirtyNotify();
 808       continue;
 809     }
 810
 811     state = j->second;
 812     state.domain = DNSDomainToString(host_sub_chunk);
 813
 814     // Succeed if we matched the domain exactly or if subdomain matches are
 815     // allowed.
 816     if (i == 0 || j->second.sts_include_subdomains ||
 817         j->second.pkp_include_subdomains) {
 818       *result = state;
 819       return true;
 820     }
 821
 822     return false;
 823   }
 824
 825   return false;
 826 }
 827
 828
 829 void TransportSecurityState::AddOrUpdateEnabledHosts(
 830     const std::string& hashed_host, const DomainState& state) {
 831   DCHECK(CalledOnValidThread());
 832   enabled_hosts_[hashed_host] = state;
 833 }
 834
 835 TransportSecurityState::DomainState::DomainState()
 836     : upgrade_mode(MODE_DEFAULT),
 837       sts_include_subdomains(false),
 838       pkp_include_subdomains(false) {
 839   base::Time now(base::Time::Now());
 840   sts_observed = now;
 841   pkp_observed = now;
 842 }
 843
 844 TransportSecurityState::DomainState::~DomainState() {
 845 }
 846
 847 bool TransportSecurityState::DomainState::CheckPublicKeyPins(
 848     const HashValueVector& hashes) const {
 849   // Validate that hashes is not empty. By the time this code is called (in
 850   // production), that should never happen, but it's good to be defensive.
 851   // And, hashes *can* be empty in some test scenarios.
 852   if (hashes.empty()) {
 853     LOG(ERROR) << "Rejecting empty public key chain for public-key-pinned "
 854                   "domain " << domain;
 855     return false;
 856   }
 857
 858   if (HashesIntersect(bad_static_spki_hashes, hashes)) {
 859     LOG(ERROR) << "Rejecting public key chain for domain " << domain
 860                << ". Validated chain: " << HashesToBase64String(hashes)
 861                << ", matches one or more bad hashes: "
 862                << HashesToBase64String(bad_static_spki_hashes);
 863     return false;
 864   }
 865
 866   // If there are no pins, then any valid chain is acceptable.
 867   if (dynamic_spki_hashes.empty() && static_spki_hashes.empty())
 868     return true;
 869
 870   if (HashesIntersect(dynamic_spki_hashes, hashes) ||
 871       HashesIntersect(static_spki_hashes, hashes)) {
 872     return true;
 873   }
 874
 875   LOG(ERROR) << "Rejecting public key chain for domain " << domain
 876              << ". Validated chain: " << HashesToBase64String(hashes)
 877              << ", expected: " << HashesToBase64String(dynamic_spki_hashes)
 878              << " or: " << HashesToBase64String(static_spki_hashes);
 879   return false;
 880 }
 881
 882 bool TransportSecurityState::DomainState::ShouldUpgradeToSSL() const {
 883   return upgrade_mode == MODE_FORCE_HTTPS;
 884 }
 885
 886 bool TransportSecurityState::DomainState::ShouldSSLErrorsBeFatal() const {
 887   return true;
 888 }
 889
 890 bool TransportSecurityState::DomainState::HasPublicKeyPins() const {
 891   return static_spki_hashes.size() > 0 ||
 892          bad_static_spki_hashes.size() > 0 ||
 893          dynamic_spki_hashes.size() > 0;
 894 }
 895
 896 }  // namespace