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,
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  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 #include <securityd_client/ss_types.h>
  36
  37 class KeychainDatabase;
  38 class KeychainDbCommon;
  39 class KeychainKey;
  40
  41
  42 //
  43 // We identify KeychainDatabases uniquely by a combination of
  44 // a DLDbIdentifier and a database (blob) identifier. Equivalence
  45 // by DbIdentifier is the criterion for parent-side merging.
  46 //
  47 class DbIdentifier {
  48 public:
  49         DbIdentifier(const DLDbIdentifier &id, DbBlob::Signature sig)
  50         : mIdent(id), mSig(sig) { }
  51
  52         const DLDbIdentifier &dlDbIdentifier() const { return mIdent; }
  53         const DbBlob::Signature &signature() const { return mSig; }
  54         operator const DLDbIdentifier &() const { return dlDbIdentifier(); }
  55         operator const DbBlob::Signature &() const      { return signature(); }
  56         const char *dbName() const                      { return mIdent.dbName(); }
  57
  58         bool operator < (const DbIdentifier &id) const  // simple lexicographic
  59         {
  60                 if (mIdent < id.mIdent) return true;
  61                 if (id.mIdent < mIdent) return false;
  62                 return mSig < id.mSig;
  63         }
  64
  65         bool operator == (const DbIdentifier &id) const
  66         { return mIdent == id.mIdent && mSig == id.mSig; }
  67
  68 private:
  69         DLDbIdentifier mIdent;
  70         DbBlob::Signature mSig;
  71 };
  72
  73
  74 //
  75 // A vestigal system-global database instance
  76 // We don't (yet) use it for anything. Perhaps it should carry our ACL...
  77 //
  78 class KeychainDbGlobal : public PerGlobal {
  79 public:
  80         KeychainDbGlobal(const DbIdentifier &id);
  81         ~KeychainDbGlobal();
  82
  83         const DbIdentifier &identifier() const { return mIdentifier; }
  84
  85 private:
  86         DbIdentifier mIdentifier;       // database external identifier [const]
  87 };
  88
  89
  90 //
  91 // KeychainDatabase DbCommons
  92 //
  93 class KeychainDbCommon : public LocalDbCommon,
  94         public DatabaseCryptoCore, public MachServer::Timer {
  95 public:
  96         KeychainDbCommon(Session &ssn, const DbIdentifier &id);
  97         ~KeychainDbCommon();
  98
  99         KeychainDbGlobal &global() const;
 100
 101         bool unlockDb(DbBlob *blob, void **privateAclBlob = NULL);
 102         void lockDb();                          // make locked (if currently unlocked)
 103         bool isLocked()                 { return mIsLocked; } // lock status
 104         void setUnlocked();
 105         void invalidateBlob()   { version++; }
 106
 107         void activity();                        // reset lock timeout
 108
 109         void makeNewSecrets();
 110
 111         const DbIdentifier &identifier() const {return mIdentifier; }
 112         const DLDbIdentifier &dlDbIdent() const { return identifier(); }
 113         const char *dbName() const { return dlDbIdent().dbName(); }
 114
 115         DbBlob *encode(KeychainDatabase &db);
 116
 117         void notify(NotificationEvent event) { DbCommon::notify(event, identifier()); }
 118
 119         void sleepProcessing();
 120         void lockProcessing();
 121
 122         bool belongsToSystem() const;
 123
 124 public:
 125     // debugging
 126     IFDUMP(void dumpNode());
 127
 128 protected:
 129         void action();                          // timer queue action to lock keychain
 130
 131         // lifetime management for our Timer personality
 132         void select();
 133         void unselect();
 134
 135 public:
 136         // all following data locked with object lock
 137         uint32 sequence;                        // change sequence number
 138         DBParameters mParams;           // database parameters (arbitrated copy)
 139
 140         uint32 version;                         // version stamp for change tracking
 141
 142 private:
 143         DbIdentifier mIdentifier;       // database external identifier [const]
 144         // all following data protected by object lock
 145         bool mIsLocked;                         // logically locked
 146         bool mValidParams;                      // mParams has been set
 147 };
 148
 149
 150 //
 151 // A Database object represents an Apple CSP/DL open database (DL/DB) object.
 152 // It maintains its protected semantic state (including keys) and provides controlled
 153 // access.
 154 //
 155 class KeychainDatabase : public LocalDatabase, private virtual SecurityServerAcl {
 156         friend class KeychainDbCommon;
 157 public:
 158         KeychainDatabase(const DLDbIdentifier &id, const DBParameters &params, Process &proc,
 159         const AccessCredentials *cred, const AclEntryPrototype *owner);
 160         KeychainDatabase(const DLDbIdentifier &id, const DbBlob *blob, Process &proc,
 161         const AccessCredentials *cred);
 162
 163         // keychain synchronization recode to a specfic blob:
 164         KeychainDatabase(KeychainDatabase &src, Process &proc, DbHandle dbToClone);
 165         virtual ~KeychainDatabase();
 166
 167         KeychainDbCommon &common() const;
 168         const char *dbName() const;
 169         bool transient() const;
 170
 171     KeychainDbGlobal &global() const { return common().global(); }
 172
 173 public:
 174         static const int maxUnlockTryCount = 3;
 175
 176 public:
 177     const DbIdentifier &identifier() const { return common().identifier(); }
 178
 179 public:
 180         // encoding/decoding databases
 181         DbBlob *blob();
 182
 183     void authenticate(CSSM_DB_ACCESS_TYPE mode, const AccessCredentials *cred);
 184     void changePassphrase(const AccessCredentials *cred);
 185         RefPointer<Key> extractMasterKey(Database &db, const AccessCredentials *cred,
 186                 const AclEntryPrototype *owner, uint32 usage, uint32 attrs);
 187     void commitSecretsForSync(KeychainDatabase &cloneDb);
 188
 189         // lock/unlock processing
 190         void lockDb();                                                                                  // unconditional lock
 191         void unlockDb();                                                                                // full-feature unlock
 192         void unlockDb(const CssmData &passphrase);                              // unlock with passphrase
 193
 194         bool decode();                                                                                  // unlock given established master key
 195         bool decode(const CssmData &passphrase);                                // set master key from PP, try unlock
 196
 197         bool validatePassphrase(const CssmData &passphrase) const; // nonthrowing validation
 198         bool isLocked()                 { return common().isLocked(); } // lock status
 199     void notify(NotificationEvent event) { return common().notify(event); }
 200     void activity() const       { common().activity(); }                // reset timeout clock
 201
 202         // encoding/decoding keys
 203     void decodeKey(KeyBlob *blob, CssmKey &key, void * &pubAcl, void * &privAcl);
 204         KeyBlob *encodeKey(const CssmKey &key, const CssmData &pubAcl, const CssmData &privAcl);
 205         KeyBlob *recodeKey(KeychainKey &oldKey);
 206     bool validBlob() const      { return mBlob && version == common().version; }
 207
 208         // manage database parameters
 209         void setParameters(const DBParameters &params);
 210         void getParameters(DBParameters &params);
 211
 212         // where's my (database) ACL?
 213         SecurityServerAcl &acl();
 214
 215         AclKind aclKind() const;
 216         Database *relatedDatabase();
 217
 218     // ACL state management hooks
 219         void instantiateAcl();
 220         void changedAcl();
 221
 222         // miscellaneous utilities
 223         static void validateBlob(const DbBlob *blob);
 224
 225     // debugging
 226     IFDUMP(void dumpNode());
 227
 228 protected:
 229         RefPointer<Key> makeKey(const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 230         RefPointer<Key> makeKey(Database &db, const CssmKey &newKey, uint32 moreAttributes, const AclEntryPrototype *owner);
 231
 232         void makeUnlocked();                                                    // interior version of unlock()
 233         void makeUnlocked(const AccessCredentials *cred); // like () with explicit cred
 234         void makeUnlocked(const CssmData &passphrase);  // interior version of unlock(CssmData)
 235
 236         void establishOldSecrets(const AccessCredentials *creds);
 237         void establishNewSecrets(const AccessCredentials *creds, SecurityAgent::Reason reason);
 238
 239         bool interactiveUnlock();
 240
 241         CssmClient::Key keyFromCreds(const TypedList &sample, unsigned int requiredLength);
 242
 243         void encode();                                                                  // (re)generate mBlob if needed
 244
 245 private:
 246         // all following data is locked by the common lock
 247     bool mValidData;                            // valid ACL and params (blob decoded)
 248
 249     uint32 version;                                     // version stamp for blob validity
 250     DbBlob *mBlob;                                      // database blob (encoded)
 251
 252     AccessCredentials *mCred;           // local access credentials (always valid)
 253
 254         RefPointer<KeychainDatabase> mRecodingSource;   // keychain synchronization ONLY; should not require accessors
 255 };
 256
 257 #endif //_H_KCDATABASE