src/codesigdb.h

   1 /*
   2  * Copyright (c) 2003-2007 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 // codesigdb - code-hash equivalence database
  27 //
  28 #ifndef _H_CODESIGDB
  29 #define _H_CODESIGDB
  30
  31 #include "acls.h"
  32 #include <security_cdsa_utilities/db++.h>
  33 #include <security_cdsa_utilities/osxverifier.h>
  34 #include <Security/CodeSigning.h>
  35
  36
  37 class Process;
  38 class CodeSignatures;
  39
  40
  41 //
  42 // A CodeSignaturse object represents a database of code-signature equivalencies
  43 // as (previously) expressed by a user and/or the system.
  44 // You'll usually only need one of these.
  45 //
  46 class CodeSignatures {
  47 public:
  48         //
  49         // Identity is an abstract class modeling a code-identity in the database.
  50         // It can represent either an existing or latent code-hash link.
  51         // Subclass must provide path and hash source functions.
  52         //
  53         class Identity {
  54                 friend class CodeSignatures;
  55         public:
  56                 Identity();
  57                 virtual ~Identity();
  58
  59                 operator bool () const                          { return mState == valid; }
  60                 std::string path()                                      { return getPath(); }
  61                 std::string name()                                      { return canonicalName(path()); }
  62                 std::string trustedName() const         { return mName; }
  63
  64                 static std::string canonicalName(const std::string &path);
  65
  66                 IFDUMP(void debugDump(const char *how = NULL) const);
  67
  68                 virtual std::string getPath() const = 0;
  69                 virtual const CssmData getHash() const = 0;
  70
  71         private:
  72                 enum { untried, valid, invalid } mState;
  73                 std::string mName;              // link db value (canonical name linked to)
  74         };
  75
  76 public:
  77         CodeSignatures(const char *path);
  78         ~CodeSignatures();
  79
  80         void open(const char *path);
  81
  82 public:
  83         bool find(Identity &id, uid_t user);
  84
  85         void makeLink(Identity &id, const std::string &ident, bool forUser = false, uid_t user = 0);
  86
  87         void addLink(const CssmData &oldHash, const CssmData &newHash,
  88                 const char *name, bool forSystem);
  89         void removeLink(const CssmData &hash, const char *name, bool forSystem);
  90
  91         IFDUMP(void debugDump(const char *how = NULL) const);
  92
  93 public:
  94         bool verify(Process &process, const OSXVerifier &verifier, const AclValidationContext &context);
  95
  96 private:
  97         OSStatus matchSignedClientToLegacyACL(Process &process, SecCodeRef code,
  98                 const OSXVerifier &verifier, const AclValidationContext &context);
  99         bool verifyLegacy(Process &process, const CssmData &signature, string path);
 100
 101 private:
 102         UnixPlusPlus::UnixDb mDb;
 103
 104         // lock hierarchy: mUILock first, then mDatabaseLock, no back-off
 105         Mutex mDatabaseLock;                    // controls mDb access
 106         Mutex mUILock;                                  // serializes user interaction
 107 };
 108
 109
 110
 111 #endif //_H_CODESIGDB