src/kcdatabase.h

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   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,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  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
  36 class KeychainDatabase;
  37 class KeychainDbCommon;
  38 class KeychainKey;
  39
  40
  41 //
  42 // We identify KeychainDatabases uniquely by a combination of
  43 // a DLDbIdentifier and a database (blob) identifier. Equivalence
  44 // by DbIdentifier is the criterion for parent-side merging.
  45 //
  46 class DbIdentifier {
  47 public:
  48         DbIdentifier(const DLDbIdentifier &id, DbBlob::Signature sig)
  49         : mIdent(id), mSig(sig) { }
  50
  51         const DLDbIdentifier &dlDbIdentifier() const { return mIdent; }
  52         const DbBlob::Signature &signature() const { return mSig; }
  53         operator const DLDbIdentifier &() const { return dlDbIdentifier(); }
  54         operator const DbBlob::Signature &() const      { return signature(); }
  55         const char *dbName() const                      { return mIdent.dbName(); }
  56
  57         bool operator < (const DbIdentifier &id) const  // simple lexicographic
  58         {
  59                 if (mIdent < id.mIdent) return true;
  60                 if (id.mIdent < mIdent) return false;
  61                 return mSig < id.mSig;
  62         }
  63
  64         bool operator == (const DbIdentifier &id) const
  65         { return mIdent == id.mIdent && mSig == id.mSig; }
  66
  67 private:
  68         DLDbIdentifier mIdent;
  69         DbBlob::Signature mSig;
  70 };
  71
  72
  73 //
  74 // A vestigal system-global database instance
  75 // We don't (yet) use it for anything. Perhaps it should carry our ACL...
  76 //
  77 class KeychainDbGlobal : public PerGlobal {
  78 public:
  79         KeychainDbGlobal(const DbIdentifier &id);
  80         ~KeychainDbGlobal();
  81
  82         const DbIdentifier &identifier() const { return mIdentifier; }
  83
  84 private:
  85         DbIdentifier mIdentifier;       // database external identifier [const]
  86 };
  87
  88
  89 //
  90 // KeychainDatabase DbCommons
  91 //
  92 class KeychainDbCommon : public LocalDbCommon,
  93         public DatabaseCryptoCore, public MachServer::Timer {
  94 public:
  95         KeychainDbCommon(Session &ssn, const DbIdentifier &id);
  96         ~KeychainDbCommon();
  97
  98         KeychainDbGlobal &global() const;
  99
 100         bool unlockDb(DbBlob *blob, void **privateAclBlob = NULL);
 101         void lockDb();                          // make locked (if currently unlocked)
 102         bool isLocked()                 { return mIsLocked; } // lock status
 103         void setUnlocked();
 104         void invalidateBlob()   { version++; }
 105
 106         void activity();                        // reset lock timeout
 107
 108         void makeNewSecrets();
 109
 110         const DbIdentifier &identifier() const {return mIdentifier; }
 111         const DLDbIdentifier &dlDbIdent() const { return identifier(); }
 112         const char *dbName() const { return dlDbIdent().dbName(); }
 113
 114         DbBlob *encode(KeychainDatabase &db);
 115
 116         void notify(NotificationEvent event) { DbCommon::notify(event, identifier()); }
 117
 118         void sleepProcessing();
 119         void lockProcessing();
 120
 121 public:
 122     // debugging
 123     IFDUMP(void dumpNode());
 124
 125 protected:
 126         void action();                          // timer queue action to lock keychain
 127
 128         // lifetime management for our Timer personality
 129         void select();
 130         void unselect();
 131
 132 public:
 133         // all following data locked with object lock
 134         uint32 sequence;                        // change sequence number
 135         DBParameters mParams;           // database parameters (arbitrated copy)
 136
 137         uint32 version;                         // version stamp for change tracking
 138
 139 private:
 140         DbIdentifier mIdentifier;       // database external identifier [const]
 141         // all following data protected by object lock
 142         bool mIsLocked;                         // logically locked
 143         bool mValidParams;                      // mParams has been set
 144 };
 145
 146
 147 //
 148 // A Database object represents an Apple CSP/DL open database (DL/DB) object.
 149 // It maintains its protected semantic state (including keys) and provides controlled
 150 // access.
 151 //
 152 class KeychainDatabase : public LocalDatabase, private virtual SecurityServerAcl {
 153         friend class KeychainDbCommon;
 154 public:
 155         KeychainDatabase(const DLDbIdentifier &id, const DBParameters &params, Process &proc,
 156         const AccessCredentials *cred, const AclEntryPrototype *owner);
 157         KeychainDatabase(const DLDbIdentifier &id, const DbBlob *blob, Process &proc,
 158         const AccessCredentials *cred);
 159         // keychain synchronization
 160         KeychainDatabase(KeychainDatabase &src, Process &proc, const DbBlob *secretsBlob, const CssmData &agentData);
 161         virtual ~KeychainDatabase();
 162
 163         KeychainDbCommon &common() const;
 164         const char *dbName() const;
 165         bool transient() const;
 166
 167     KeychainDbGlobal &global() const { return common().global(); }
 168
 169 public:
 170         static const int maxUnlockTryCount = 3;
 171
 172 public:
 173     const DbIdentifier &identifier() const { return common().identifier(); }
 174
 175 public:
 176         // encoding/decoding databases
 177         DbBlob *blob();
 178
 179     void authenticate(CSSM_DB_ACCESS_TYPE mode, const AccessCredentials *cred);
 180     void changePassphrase(const AccessCredentials *cred);
 181         RefPointer<Key> extractMasterKey(Database &db, const AccessCredentials *cred,
 182                 const AclEntryPrototype *owner, uint32 usage, uint32 attrs);
 183     void commitSecretsForSync(KeychainDatabase &cloneDb);
 184
 185         // lock/unlock processing
 186         void lockDb();                                                                                  // unconditional lock
 187         void unlockDb();                                                                                // full-feature unlock
 188         void unlockDb(const CssmData &passphrase);                              // unlock with passphrase
 189
 190         bool decode();                                                                                  // unlock given established master key
 191         bool decode(const CssmData &passphrase);                                // set master key from PP, try unlock
 192
 193         bool validatePassphrase(const CssmData &passphrase) const; // nonthrowing validation
 194         bool isLocked()                 { return common().isLocked(); } // lock status
 195     void notify(NotificationEvent event) { return common().notify(event); }
 196     void activity() const       { common().activity(); }                // reset timeout clock
 197
 198         // encoding/decoding keys
 199     void decodeKey(KeyBlob *blob, CssmKey &key, void * &pubAcl, void * &privAcl);
 200         KeyBlob *encodeKey(const CssmKey &key, const CssmData &pubAcl, const CssmData &privAcl);
 201         KeyBlob *recodeKey(KeychainKey &oldKey);
 202     bool validBlob() const      { return mBlob && version == common().version; }
 203
 204         // manage database parameters
 205         void setParameters(const DBParameters &params);
 206         void getParameters(DBParameters &params);
 207
 208         // where's my (database) ACL?
 209         SecurityServerAcl &acl();
 210
 211         AclKind aclKind() const;
 212         Database *relatedDatabase();
 213
 214     // ACL state management hooks
 215         void instantiateAcl();
 216         void changedAcl();
 217
 218         // miscellaneous utilities
 219         static void validateBlob(const DbBlob *blob);
 220
 221     // debugging
 222     IFDUMP(void dumpNode());
 223
 224 protected:
 225         RefPointer<Key> makeKey(const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 226         RefPointer<Key> makeKey(Database &db, const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 227
 228         void makeUnlocked();                                                    // interior version of unlock()
 229         void makeUnlocked(const AccessCredentials *cred); // like () with explicit cred
 230         void makeUnlocked(const CssmData &passphrase);  // interior version of unlock(CssmData)
 231
 232         void establishOldSecrets(const AccessCredentials *creds);
 233         void establishNewSecrets(const AccessCredentials *creds, SecurityAgent::Reason reason);
 234
 235         bool interactiveUnlock();
 236
 237         CssmClient::Key keyFromCreds(const TypedList &sample, unsigned int requiredLength);
 238
 239         void encode();                                                                  // (re)generate mBlob if needed
 240
 241 private:
 242         // all following data is locked by the common lock
 243     bool mValidData;                            // valid ACL and params (blob decoded)
 244
 245     uint32 version;                                     // version stamp for blob validity
 246     DbBlob *mBlob;                                      // database blob (encoded)
 247
 248     AccessCredentials *mCred;           // local access credentials (always valid)
 249
 250         RefPointer<KeychainDatabase> mRecodingSource;   // keychain synchronization ONLY; should not require accessors
 251 };
 252
 253 #endif //_H_KCDATABASE