securityd/src/kcdatabase.h

   1 /*
   2  * Copyright (c) 2000-2008,2012-2013 Apple Inc. All Rights Reserved.
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   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  23
  24
  25 //
  26 // kcdatabase - software database container implementation.
  27 //
  28 // A KeychainDatabase is a software storage container,
  29 // implemented in cooperation by the AppleCSLDP CDSA plugin and this daemon.
  30 //
  31 #ifndef _H_KCDATABASE
  32 #define _H_KCDATABASE
  33
  34 #include "localdatabase.h"
  35 #include <securityd_client/ss_types.h>
  36 #include "agentclient.h"
  37
  38 class KeychainDatabase;
  39 class KeychainDbCommon;
  40 class KeychainKey;
  41
  42
  43 //
  44 // We identify KeychainDatabases uniquely by a combination of
  45 // a DLDbIdentifier and a database (blob) identifier. Equivalence
  46 // by DbIdentifier is the criterion for parent-side merging.
  47 //
  48 class DbIdentifier {
  49 public:
  50         DbIdentifier(const DLDbIdentifier &id, DbBlob::Signature sig)
  51         : mIdent(id), mSig(sig) { }
  52
  53         const DLDbIdentifier &dlDbIdentifier() const { return mIdent; }
  54         const DbBlob::Signature &signature() const { return mSig; }
  55         operator const DLDbIdentifier &() const { return dlDbIdentifier(); }
  56         operator const DbBlob::Signature &() const      { return signature(); }
  57         const char *dbName() const                      { return mIdent.dbName(); }
  58
  59         bool operator < (const DbIdentifier &id) const  // simple lexicographic
  60         {
  61                 if (mIdent < id.mIdent) return true;
  62                 if (id.mIdent < mIdent) return false;
  63                 return mSig < id.mSig;
  64         }
  65
  66         bool operator == (const DbIdentifier &id) const
  67         { return mIdent == id.mIdent && mSig == id.mSig; }
  68
  69 private:
  70         DLDbIdentifier mIdent;
  71         DbBlob::Signature mSig;
  72 };
  73
  74
  75 //
  76 // A vestigal system-global database instance
  77 // We don't (yet) use it for anything. Perhaps it should carry our ACL...
  78 //
  79 class KeychainDbGlobal : public PerGlobal {
  80 public:
  81         KeychainDbGlobal(const DbIdentifier &id);
  82         ~KeychainDbGlobal();
  83
  84         const DbIdentifier &identifier() const { return mIdentifier; }
  85
  86 private:
  87         DbIdentifier mIdentifier;       // database external identifier [const]
  88 };
  89
  90
  91 //
  92 // KeychainDatabase DbCommons
  93 //
  94 class KeychainDbCommon : public LocalDbCommon,
  95         public DatabaseCryptoCore, public MachServer::Timer {
  96 public:
  97     KeychainDbCommon(Session &ssn, const DbIdentifier &id, uint32 requestedVersion = CommonBlob::version_none);
  98     KeychainDbCommon(Session &ssn, const DbIdentifier &id, KeychainDbCommon& toClone);
  99         ~KeychainDbCommon();
 100
 101     // If you have an existing KeychainDbCommon, and want to make it look a lot like that one
 102     void cloneFrom(KeychainDbCommon& toClone, uint32 requestedVersion = CommonBlob::version_none);
 103
 104     // finishes the initialization of this KeychainDbCommon. Do not call this
 105     // while holding the mCommon lock, or you may get a multiprocess deadlock.
 106     void initializeKeybag();
 107
 108         void kill();                // remove from commonSet
 109
 110         KeychainDbGlobal &global() const;
 111
 112         bool unlockDb(DbBlob *blob, void **privateAclBlob = NULL);
 113         void lockDb();                          // make locked (if currently unlocked)
 114         bool isLocked()                 { return mIsLocked; } // lock status
 115         void setUnlocked();
 116         void invalidateBlob()   { version++; }
 117
 118         void activity();                        // reset lock timeout
 119
 120         void makeNewSecrets();
 121
 122         const DbIdentifier &identifier() const {return mIdentifier; }
 123         const DLDbIdentifier &dlDbIdent() const { return identifier(); }
 124         const char *dbName() const { return dlDbIdent().dbName(); }
 125     uint32 dbVersion() { return DatabaseCryptoCore::mBlobVersion; }
 126     bool isLoginKeychain() const { return mLoginKeychain; }
 127
 128         DbBlob *encode(KeychainDatabase &db);
 129
 130         void notify(NotificationEvent event) { DbCommon::notify(event, identifier()); }
 131
 132         void sleepProcessing();
 133         void lockProcessing();
 134
 135         bool belongsToSystem() const;
 136     bool isDefaultSystemKeychain() const;
 137
 138 public:
 139     // debugging
 140     IFDUMP(void dumpNode());
 141
 142 protected:
 143         void action();                          // timer queue action to lock keychain
 144
 145         // lifetime management for our Timer personality
 146         void select();
 147         void unselect();
 148
 149 public:
 150         // all following data locked with object lock
 151         uint32 sequence;                        // change sequence number
 152         DBParameters mParams;           // database parameters (arbitrated copy)
 153
 154         uint32 version;                         // version stamp for change tracking
 155
 156 private:
 157         DbIdentifier mIdentifier;       // database external identifier [const]
 158         // all following data protected by object lock
 159         bool mIsLocked;                         // logically locked
 160         bool mValidParams;                      // mParams has been set
 161     bool mLoginKeychain;
 162
 163 public:
 164     void insert();              // insert into commonSet
 165     static bool find(const DbIdentifier &ident, Session &session, RefPointer<KeychainDbCommon> &common,
 166             uint32 requestedVersion = CommonBlob::version_none, KeychainDbCommon* cloneFrom = NULL); // find in commonSet
 167
 168 private:
 169     void insertHoldingLock();              // Does the guts of insert(); you must hold a write lock on mRWCommonLock when calling this
 170
 171     // global set of KeychainDbCommons for name unification
 172     typedef std::set<KeychainDbCommon *> CommonSet;
 173     static CommonSet mCommonSet;
 174     static ReadWriteLock mRWCommonLock;           //protects only mCommonSet
 175 };
 176
 177
 178 //
 179 // A Database object represents an Apple CSP/DL open database (DL/DB) object.
 180 // It maintains its protected semantic state (including keys) and provides controlled
 181 // access.
 182 //
 183 class KeychainDatabase : public LocalDatabase, private virtual SecurityServerAcl {
 184         friend class KeychainDbCommon;
 185 public:
 186         KeychainDatabase(const DLDbIdentifier &id, const DBParameters &params, Process &proc,
 187         const AccessCredentials *cred, const AclEntryPrototype *owner);
 188         KeychainDatabase(const DLDbIdentifier &id, const DbBlob *blob, Process &proc,
 189         const AccessCredentials *cred);
 190
 191         // keychain synchronization recode to a specfic blob:
 192         KeychainDatabase(KeychainDatabase &src, Process &proc, DbHandle dbToClone);
 193
 194     // Clone another database, but to a new DLDb identifier
 195     KeychainDatabase(const DLDbIdentifier &id, KeychainDatabase &src, Process &proc);
 196
 197     // Copy another database, but with new secrets.
 198     // To use this, you must provide the version you want to end up with.
 199     KeychainDatabase(uint32 requestedVersion, KeychainDatabase &src, Process &proc);
 200         virtual ~KeychainDatabase();
 201
 202         KeychainDbCommon &common() const;
 203         const char *dbName() const;
 204         bool transient() const;
 205
 206     KeychainDbGlobal &global() const { return common().global(); }
 207
 208 public:
 209         static const int maxUnlockTryCount = 3;
 210
 211 public:
 212     const DbIdentifier &identifier() const { return common().identifier(); }
 213
 214 public:
 215         // encoding/decoding databases
 216         DbBlob *blob();
 217
 218     void authenticate(CSSM_DB_ACCESS_TYPE mode, const AccessCredentials *cred);
 219     bool checkCredentials(const AccessCredentials* creds);
 220     void changePassphrase(const AccessCredentials *cred);
 221         RefPointer<Key> extractMasterKey(Database &db, const AccessCredentials *cred,
 222                 const AclEntryPrototype *owner, uint32 usage, uint32 attrs);
 223     void commitSecretsForSync(KeychainDatabase &cloneDb);
 224
 225         // lock/unlock processing
 226         void lockDb();                                                                                  // unconditional lock
 227         void unlockDb(bool unlockKeybag);                       // full-feature unlock
 228         void unlockDb(const CssmData &passphrase, bool unlockKeybag);   // unlock with passphrase
 229
 230     void stashDbCheck();                                    // check AppleKeyStore for master key
 231     void stashDb();                                         // stash master key in AppleKeyStore
 232
 233         bool decode();                                                                                  // unlock given established master key
 234         bool decode(const CssmData &passphrase);                                // set master key from PP, try unlock
 235
 236         bool validatePassphrase(const CssmData &passphrase) const; // nonthrowing validation
 237         bool isLocked()                 { return common().isLocked(); } // lock status
 238     void notify(NotificationEvent event) { return common().notify(event); }
 239     void activity() const       { common().activity(); }                // reset timeout clock
 240
 241         // encoding/decoding keys
 242     void decodeKey(KeyBlob *blob, CssmKey &key, void * &pubAcl, void * &privAcl);
 243         KeyBlob *encodeKey(const CssmKey &key, const CssmData &pubAcl, const CssmData &privAcl);
 244         KeyBlob *recodeKey(KeychainKey &oldKey);
 245     bool validBlob() const      { return mBlob && version == common().version; }
 246
 247         // manage database parameters
 248         void setParameters(const DBParameters &params);
 249         void getParameters(DBParameters &params);
 250
 251         // where's my (database) ACL?
 252         SecurityServerAcl &acl();
 253
 254         AclKind aclKind() const;
 255         Database *relatedDatabase();
 256
 257     // ACL state management hooks
 258         void instantiateAcl();
 259         void changedAcl();
 260
 261         // miscellaneous utilities
 262         static void validateBlob(const DbBlob *blob);
 263
 264     bool isRecoding();
 265
 266     // Notify ourselves that the keychain recode/migration has finished
 267     void recodeFinished();
 268
 269     // debugging
 270     IFDUMP(void dumpNode());
 271
 272 protected:
 273         RefPointer<Key> makeKey(const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 274         RefPointer<Key> makeKey(Database &db, const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 275
 276         void makeUnlocked(bool unlockKeybag);   // interior version of unlock()
 277         void makeUnlocked(const AccessCredentials *cred, bool unlockKeybag); // like () with explicit cred
 278         void makeUnlocked(const CssmData &passphrase, bool unlockKeybag);        // interior version of unlock(CssmData)
 279
 280         void establishOldSecrets(const AccessCredentials *creds);
 281         bool establishNewSecrets(const AccessCredentials *creds, SecurityAgent::Reason reason);
 282
 283         bool interactiveUnlock();
 284
 285         CssmClient::Key keyFromCreds(const TypedList &sample, unsigned int requiredLength);
 286
 287         void encode();                                                                  // (re)generate mBlob if needed
 288
 289     // Counts the number of total interactive unlocks attempted by securityd
 290     static uint32_t interactiveUnlockAttempts;
 291
 292 public:
 293     static uint32_t getInteractiveUnlockAttempts();
 294
 295 private:
 296         // all following data is locked by the common lock
 297     bool mValidData;                            // valid ACL and params (blob decoded)
 298     CssmAutoData mSecret;
 299     bool mSaveSecret;
 300
 301     uint32 version;                                     // version stamp for blob validity
 302     DbBlob *mBlob;                                      // database blob (encoded)
 303
 304     AccessCredentials *mCred;           // local access credentials (always valid)
 305
 306         RefPointer<KeychainDatabase> mRecodingSource;   // keychain synchronization ONLY; should not require accessors
 307     bool mRecoded;                  // true once a recode completes, until recodeFinished is called
 308 };
 309
 310 #endif //_H_KCDATABASE