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);
  98         ~KeychainDbCommon();
  99
 100         KeychainDbGlobal &global() const;
 101
 102         bool unlockDb(DbBlob *blob, void **privateAclBlob = NULL);
 103         void lockDb();                          // make locked (if currently unlocked)
 104         bool isLocked()                 { return mIsLocked; } // lock status
 105         void setUnlocked();
 106         void invalidateBlob()   { version++; }
 107
 108         void activity();                        // reset lock timeout
 109
 110         void makeNewSecrets();
 111
 112         const DbIdentifier &identifier() const {return mIdentifier; }
 113         const DLDbIdentifier &dlDbIdent() const { return identifier(); }
 114         const char *dbName() const { return dlDbIdent().dbName(); }
 115     bool isLoginKeychain() const { return mLoginKeychain; }
 116
 117         DbBlob *encode(KeychainDatabase &db);
 118
 119         void notify(NotificationEvent event) { DbCommon::notify(event, identifier()); }
 120
 121         void sleepProcessing();
 122         void lockProcessing();
 123
 124         bool belongsToSystem() const;
 125
 126 public:
 127     // debugging
 128     IFDUMP(void dumpNode());
 129
 130 protected:
 131         void action();                          // timer queue action to lock keychain
 132
 133         // lifetime management for our Timer personality
 134         void select();
 135         void unselect();
 136
 137 public:
 138         // all following data locked with object lock
 139         uint32 sequence;                        // change sequence number
 140         DBParameters mParams;           // database parameters (arbitrated copy)
 141
 142         uint32 version;                         // version stamp for change tracking
 143
 144 private:
 145         DbIdentifier mIdentifier;       // database external identifier [const]
 146         // all following data protected by object lock
 147         bool mIsLocked;                         // logically locked
 148         bool mValidParams;                      // mParams has been set
 149     bool mLoginKeychain;
 150 };
 151
 152
 153 //
 154 // A Database object represents an Apple CSP/DL open database (DL/DB) object.
 155 // It maintains its protected semantic state (including keys) and provides controlled
 156 // access.
 157 //
 158 class KeychainDatabase : public LocalDatabase, private virtual SecurityServerAcl {
 159         friend class KeychainDbCommon;
 160 public:
 161         KeychainDatabase(const DLDbIdentifier &id, const DBParameters &params, Process &proc,
 162         const AccessCredentials *cred, const AclEntryPrototype *owner);
 163         KeychainDatabase(const DLDbIdentifier &id, const DbBlob *blob, Process &proc,
 164         const AccessCredentials *cred);
 165
 166         // keychain synchronization recode to a specfic blob:
 167         KeychainDatabase(KeychainDatabase &src, Process &proc, DbHandle dbToClone);
 168         virtual ~KeychainDatabase();
 169
 170         KeychainDbCommon &common() const;
 171         const char *dbName() const;
 172         bool transient() const;
 173
 174     KeychainDbGlobal &global() const { return common().global(); }
 175
 176 public:
 177         static const int maxUnlockTryCount = 3;
 178
 179 public:
 180     const DbIdentifier &identifier() const { return common().identifier(); }
 181
 182 public:
 183         // encoding/decoding databases
 184         DbBlob *blob();
 185
 186     void authenticate(CSSM_DB_ACCESS_TYPE mode, const AccessCredentials *cred);
 187     void changePassphrase(const AccessCredentials *cred);
 188         RefPointer<Key> extractMasterKey(Database &db, const AccessCredentials *cred,
 189                 const AclEntryPrototype *owner, uint32 usage, uint32 attrs);
 190     void commitSecretsForSync(KeychainDatabase &cloneDb);
 191
 192         // lock/unlock processing
 193         void lockDb();                                                                                  // unconditional lock
 194         void unlockDb();                                                                                // full-feature unlock
 195         void unlockDb(const CssmData &passphrase);                              // unlock with passphrase
 196
 197     void stashDbCheck();                                    // check AppleKeyStore for master key
 198     void stashDb();                                         // stash master key in AppleKeyStore
 199
 200         bool decode();                                                                                  // unlock given established master key
 201         bool decode(const CssmData &passphrase);                                // set master key from PP, try unlock
 202
 203         bool validatePassphrase(const CssmData &passphrase) const; // nonthrowing validation
 204         bool isLocked()                 { return common().isLocked(); } // lock status
 205     void notify(NotificationEvent event) { return common().notify(event); }
 206     void activity() const       { common().activity(); }                // reset timeout clock
 207
 208         // encoding/decoding keys
 209     void decodeKey(KeyBlob *blob, CssmKey &key, void * &pubAcl, void * &privAcl);
 210         KeyBlob *encodeKey(const CssmKey &key, const CssmData &pubAcl, const CssmData &privAcl);
 211         KeyBlob *recodeKey(KeychainKey &oldKey);
 212     bool validBlob() const      { return mBlob && version == common().version; }
 213
 214         // manage database parameters
 215         void setParameters(const DBParameters &params);
 216         void getParameters(DBParameters &params);
 217
 218         // where's my (database) ACL?
 219         SecurityServerAcl &acl();
 220
 221         AclKind aclKind() const;
 222         Database *relatedDatabase();
 223
 224     // ACL state management hooks
 225         void instantiateAcl();
 226         void changedAcl();
 227
 228         // miscellaneous utilities
 229         static void validateBlob(const DbBlob *blob);
 230
 231     // debugging
 232     IFDUMP(void dumpNode());
 233
 234 protected:
 235         RefPointer<Key> makeKey(const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 236         RefPointer<Key> makeKey(Database &db, const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 237
 238         void makeUnlocked();                                                    // interior version of unlock()
 239         void makeUnlocked(const AccessCredentials *cred); // like () with explicit cred
 240         void makeUnlocked(const CssmData &passphrase);  // interior version of unlock(CssmData)
 241
 242         void establishOldSecrets(const AccessCredentials *creds);
 243         bool establishNewSecrets(const AccessCredentials *creds, SecurityAgent::Reason reason);
 244
 245         bool interactiveUnlock();
 246
 247         CssmClient::Key keyFromCreds(const TypedList &sample, unsigned int requiredLength);
 248
 249         void encode();                                                                  // (re)generate mBlob if needed
 250
 251 private:
 252         // all following data is locked by the common lock
 253     bool mValidData;                            // valid ACL and params (blob decoded)
 254     CssmAutoData mSecret;
 255     bool mSaveSecret;
 256
 257     uint32 version;                                     // version stamp for blob validity
 258     DbBlob *mBlob;                                      // database blob (encoded)
 259
 260     AccessCredentials *mCred;           // local access credentials (always valid)
 261
 262         RefPointer<KeychainDatabase> mRecodingSource;   // keychain synchronization ONLY; should not require accessors
 263 };
 264
 265 #endif //_H_KCDATABASE