lib/policydb.h

   1 /*
   2  * Copyright (c) 2011-2012 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 #ifndef _H_POLICYDB
  24 #define _H_POLICYDB
  25
  26 #include <security_utilities/globalizer.h>
  27 #include <security_utilities/hashing.h>
  28 #include <security_utilities/sqlite++.h>
  29 #include <CoreFoundation/CoreFoundation.h>
  30
  31 namespace Security {
  32 namespace CodeSigning {
  33
  34
  35 namespace SQLite = SQLite3;
  36
  37
  38 static const char defaultDatabase[] = "/var/db/SystemPolicy";
  39 static const char visibleSecurityFlagFile[] = "/var/db/.sp_visible"; /* old duchess/emir style configration */
  40 static const char prefsFile[] = "/var/db/SystemPolicy-prefs.plist";
  41
  42 static const char gkeAuthFile[] = "/var/db/gke.auth";
  43 static const char gkeSigsFile[] = "/var/db/gke.sigs";
  44 static const unsigned int gkeCheckInterval = 60;        // seconds
  45
  46
  47 //
  48 // We use Julian dates in the database, because SQLite understands them well and they convert easily to/from CFAbsoluteTime
  49 //
  50 static const double never = 5000000;    // canonical "never" julian date (an arbitrary point in the year 8977)
  51 static const double julianBase = 2451910.5;     // julian date of CFAbsoluteTime epoch
  52
  53 static inline double dateToJulian(CFDateRef time)
  54 { return CFDateGetAbsoluteTime(time) / 86400.0 + julianBase; }
  55
  56 static inline CFDateRef julianToDate(double julian)
  57 { return CFDateCreate(NULL, (julian - julianBase) * 86400); }
  58
  59
  60 typedef SHA1::SDigest ObjectHash;
  61
  62
  63 typedef uint AuthorityType;
  64 enum {
  65         kAuthorityInvalid = 0,                          // not a valid authority type
  66         kAuthorityExecute = 1,                          // authorizes launch and execution
  67         kAuthorityInstall = 2,                          // authorizes installation
  68         kAuthorityOpenDoc = 3,                          // authorizes opening of documents
  69 };
  70
  71
  72 //
  73 // Defined flags for authority flags column
  74 //
  75 enum {
  76         kAuthorityFlagVirtual = 0x0001, // virtual rule (anchoring object records)
  77         kAuthorityFlagDefault = 0x0002, // rule is part of the original default set
  78         kAuthorityFlagInhibitCache = 0x0004, // never cache outcome of this rule
  79         kAuthorityFlagWhitelist = 0x1000,       // whitelist override
  80 };
  81
  82
  83 //
  84 // Mapping/translation to/from API space
  85 //
  86 AuthorityType typeFor(CFDictionaryRef context, AuthorityType type = kAuthorityInvalid);
  87 CFStringRef typeNameFor(AuthorityType type)
  88     CF_RETURNS_RETAINED;
  89
  90
  91 //
  92 // An open policy database.
  93 // Usually read-only, but can be opened for write by privileged callers.
  94 // This is a translucent wrapper around SQLite::Database; the caller
  95 // is expected to work with statement rows.
  96 //
  97 class PolicyDatabase : public SQLite::Database {
  98 public:
  99         PolicyDatabase(const char *path = NULL, int flags = SQLITE_OPEN_READONLY);
 100         virtual ~PolicyDatabase();
 101
 102 public:
 103         bool checkCache(CFURLRef path, AuthorityType type, CFMutableDictionaryRef result);
 104
 105 public:
 106         void purgeAuthority();
 107         void purgeObjects();
 108         void purgeObjects(double priority);//
 109
 110         void upgradeDatabase();
 111         std::string featureLevel(const char *feature);
 112         bool hasFeature(const char *feature) { return !featureLevel(feature).empty(); }
 113         void addFeature(const char *feature, const char *value, const char *remarks);
 114         void simpleFeature(const char *feature, const char *sql);
 115         void simpleFeature(const char *feature, void (^perform)());
 116
 117         void installExplicitSet(const char *auth, const char *sigs);
 118
 119 private:
 120         time_t mLastExplicitCheck;
 121 };
 122
 123
 124 //
 125 // Check the system-wide overriding flag file
 126 //
 127 bool overrideAssessment();
 128 void setAssessment(bool masterSwitch);
 129
 130 } // end namespace CodeSigning
 131 } // end namespace Security
 132
 133 #endif //_H_POLICYDB