libsecurity_codesigning/lib/StaticCode.h

   1 /*
   2  * Copyright (c) 2006-2012 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
  24 //
  25 // StaticCode - SecStaticCode API objects
  26 //
  27 #ifndef _H_STATICCODE
  28 #define _H_STATICCODE
  29
  30 #include "cs.h"
  31 #include "Requirements.h"
  32 #include "requirement.h"
  33 #include "diskrep.h"
  34 #include "codedirectory.h"
  35 #include <Security/SecTrust.h>
  36 #include <CoreFoundation/CFData.h>
  37
  38 namespace Security {
  39 namespace CodeSigning {
  40
  41
  42 class SecCode;
  43
  44
  45 //
  46 // A SecStaticCode object represents the file system version of some code.
  47 // There's a lot of pieces to this, and we'll bring them all into
  48 // memory here (lazily) and let you fondle them with ease.
  49 //
  50 // Note that concrete knowledge of where stuff is stored resides in the DiskRep
  51 // object we hold. DiskReps allocate, retrieve, and return data to us. We are
  52 // responsible for interpreting, caching, and validating them. (In other words,
  53 // DiskReps know where stuff is and how it is stored, but we know what it means.)
  54 //
  55 // Data accessors (returning CFDataRef, CFDictionaryRef, various pointers, etc.)
  56 // cache those values internally and return unretained(!) references ("Get" style)
  57 // that are valid as long as the SecStaticCode object's lifetime, or until
  58 // resetValidity() is called, whichever is sooner. If you need to keep them longer,
  59 // retain or copy them as needed.
  60 //
  61 class SecStaticCode : public SecCFObject {
  62         NOCOPY(SecStaticCode)
  63
  64 protected:
  65         //
  66         // A context for resource validation operations, to tailor error response.
  67         // The base class throws an exception immediately and ignores detail data.
  68         //
  69         class ValidationContext {
  70         public:
  71                 virtual ~ValidationContext();
  72                 virtual void reportProblem(OSStatus rc, CFStringRef type, CFTypeRef value);
  73         };
  74
  75         //
  76         // A CollectingContext collects all error details and throws an annotated final error.
  77         //
  78         class CollectingContext : public ValidationContext {
  79         public:
  80                 CollectingContext(SecStaticCode &c) : code(c), mStatus(errSecSuccess) { }
  81                 void reportProblem(OSStatus rc, CFStringRef type, CFTypeRef value);
  82
  83                 OSStatus osStatus()             { return mStatus; }
  84                 operator OSStatus () const              { return mStatus; }
  85                 void throwMe() __attribute__((noreturn));
  86
  87                 SecStaticCode &code;
  88
  89         private:
  90                 CFRef<CFMutableDictionaryRef> mCollection;
  91                 OSStatus mStatus;
  92         };
  93
  94 public:
  95         SECCFFUNCTIONS(SecStaticCode, SecStaticCodeRef,
  96                 errSecCSInvalidObjectRef, gCFObjects().StaticCode)
  97
  98         // implicitly convert SecCodeRefs to their SecStaticCodeRefs
  99         static SecStaticCode *requiredStatic(SecStaticCodeRef ref);     // convert SecCodeRef
 100         static SecCode *optionalDynamic(SecStaticCodeRef ref); // extract SecCodeRef or NULL if static
 101
 102         SecStaticCode(DiskRep *rep);
 103     virtual ~SecStaticCode() throw();
 104
 105     bool equal(SecCFObject &other);
 106     CFHashCode hash();
 107
 108         void detachedSignature(CFDataRef sig);          // attach an explicitly given detached signature
 109         void checkForSystemSignature();                         // check for and attach system-supplied detached signature
 110
 111         const CodeDirectory *codeDirectory(bool check = true);
 112         CFDataRef cdHash();
 113         CFDataRef signature();
 114         CFAbsoluteTime signingTime();
 115         CFAbsoluteTime signingTimestamp();
 116         bool isSigned() { return codeDirectory(false) != NULL; }
 117         DiskRep *diskRep() { return mRep; }
 118         bool isDetached() const { return mRep->base() != mRep; }
 119         std::string mainExecutablePath() { return mRep->mainExecutablePath(); }
 120         CFURLRef copyCanonicalPath() const { return mRep->copyCanonicalPath(); }
 121         std::string identifier() { return codeDirectory()->identifier(); }
 122         const char *teamID() { return codeDirectory()->teamID(); }
 123         std::string format() const { return mRep->format(); }
 124         std::string signatureSource();
 125         virtual CFDataRef component(CodeDirectory::SpecialSlot slot, OSStatus fail = errSecCSSignatureFailed);
 126         virtual CFDictionaryRef infoDictionary();
 127
 128         CFDictionaryRef entitlements();
 129
 130         CFDictionaryRef resourceDictionary(bool check = true);
 131         CFURLRef resourceBase();
 132         CFDataRef resource(std::string path);
 133         CFDataRef resource(std::string path, ValidationContext &ctx);
 134         void validateResource(CFDictionaryRef files, std::string path, bool isSymlink, ValidationContext &ctx, SecCSFlags flags, uint32_t version);
 135
 136         bool flag(uint32_t tested);
 137
 138         SecCodeCallback monitor() const { return mMonitor; }
 139         void setMonitor(SecCodeCallback monitor) { mMonitor = monitor; }
 140         CFTypeRef reportEvent(CFStringRef stage, CFDictionaryRef info);
 141
 142         void setValidationModifiers(CFDictionaryRef modifiers);
 143
 144         void resetValidity();                                           // clear validation caches (if something may have changed)
 145
 146         bool validated() const  { return mValidated; }
 147         bool valid() const
 148                 { assert(validated()); return mValidated && (mValidationResult == errSecSuccess); }
 149         bool validatedExecutable() const        { return mExecutableValidated; }
 150         bool validatedResources() const { return mResourcesValidated; }
 151
 152         void validateDirectory();
 153         virtual void validateComponent(CodeDirectory::SpecialSlot slot, OSStatus fail = errSecCSSignatureFailed);
 154         void validateNonResourceComponents();
 155         void validateResources(SecCSFlags flags);
 156         void validateExecutable();
 157         void validateNestedCode(CFURLRef path, const ResourceSeal &seal, SecCSFlags flags, bool isFramework);
 158
 159         const Requirements *internalRequirements();
 160         const Requirement *internalRequirement(SecRequirementType type);
 161         const Requirement *designatedRequirement();
 162         const Requirement *defaultDesignatedRequirement();              // newly allocated (caller owns)
 163
 164         void validateRequirements(SecRequirementType type, SecStaticCode *target,
 165                 OSStatus nullError = errSecSuccess);                                                                            // target against my [type], throws
 166         void validateRequirement(const Requirement *req, OSStatus failure);             // me against [req], throws
 167         bool satisfiesRequirement(const Requirement *req, OSStatus failure);    // me against [req], returns on clean miss
 168
 169         // certificates are available after signature validation (they are stored in the CMS signature)
 170         SecCertificateRef cert(int ix);         // get a cert from the cert chain
 171         CFArrayRef certificates();                      // get the entire certificate chain
 172
 173         CFDictionaryRef signingInformation(SecCSFlags flags); // omnibus information-gathering API (creates new dictionary)
 174
 175         static bool isAppleDeveloperCert(CFArrayRef certs); // determines if this is an apple developer certificate for libraray validation
 176
 177 public:
 178         void staticValidate(SecCSFlags flags, const SecRequirement *req);
 179         void staticValidateCore(SecCSFlags flags, const SecRequirement *req);
 180
 181 protected:
 182         CFDictionaryRef getDictionary(CodeDirectory::SpecialSlot slot, bool check = true); // component value as a dictionary
 183         bool verifySignature();
 184         CFTypeRef verificationPolicy(SecCSFlags flags);
 185
 186         static void checkOptionalResource(CFTypeRef key, CFTypeRef value, void *context);
 187         bool hasWeakResourceRules(CFDictionaryRef rulesDict, CFArrayRef allowedOmissions);
 188
 189         void handleOtherArchitectures(void (^handle)(SecStaticCode* other));
 190
 191 private:
 192         void validateOtherVersions(CFURLRef path, SecCSFlags flags, SecRequirementRef req, SecStaticCode *code);
 193
 194 private:
 195         RefPointer<DiskRep> mRep;                       // on-disk representation
 196         CFRef<CFDataRef> mDetachedSig;          // currently applied explicit detached signature
 197
 198         // private validation modifiers (only used by Gatekeeper checkfixes)
 199         MacOSErrorSet mTolerateErrors;          // soft error conditions to ignore
 200         CFRef<CFArrayRef> mAllowOmissions;      // additionally allowed resource omissions
 201
 202         // master validation state
 203         bool mValidated;                                        // core validation was attempted
 204         OSStatus mValidationResult;                     // outcome of core validation
 205         bool mValidationExpired;                        // outcome had expired certificates
 206
 207         // static executable validation state (nested within mValidated/mValid)
 208         bool mExecutableValidated;                      // tried to validate executable file
 209         OSStatus mExecutableValidResult;                // outcome if mExecutableValidated
 210
 211         // static resource validation state (nested within mValidated/mValid)
 212         bool mResourcesValidated;                       // tried to validate resources
 213         bool mResourcesDeep;                            // cached validation was deep
 214         OSStatus mResourcesValidResult;                 // outcome if mResourceValidated or...
 215         CollectingContext *mResourcesValidContext;      //
 216
 217         // cached contents
 218         CFRef<CFDataRef> mDir;                          // code directory data
 219         CFRef<CFDataRef> mSignature;            // CMS signature data
 220         CFAbsoluteTime mSigningTime;            // (signed) signing time
 221         CFAbsoluteTime mSigningTimestamp;               // Timestamp time (from timestamping authority)
 222         CFRef<CFDataRef> mCache[cdSlotCount]; // NULL => not tried, kCFNull => absent, other => present
 223
 224         // alternative cache forms (storage may depend on cached contents above)
 225         CFRef<CFDictionaryRef> mInfoDict;       // derived from mCache slot
 226         CFRef<CFDictionaryRef> mEntitlements; // derived from mCache slot
 227         CFRef<CFDictionaryRef> mResourceDict; // derived from mCache slot
 228         const Requirement *mDesignatedReq;      // cached designated req if we made one up
 229         CFRef<CFDataRef> mCDHash;                       // hash of CodeDirectory
 230
 231         bool mGotResourceBase;                          // asked mRep for resourceBasePath
 232         CFRef<CFURLRef> mResourceBase;          // URL form of resource base directory
 233
 234         SecCodeCallback mMonitor;                       // registered monitor callback
 235
 236         // signature verification outcome (mTrust == NULL => not done yet)
 237         CFRef<SecTrustRef> mTrust;                      // outcome of crypto validation (valid or not)
 238         CFRef<CFArrayRef> mCertChain;
 239         CSSM_TP_APPLE_EVIDENCE_INFO *mEvalDetails;
 240 };
 241
 242
 243 } // end namespace CodeSigning
 244 } // end namespace Security
 245
 246 #endif // !_H_STATICCODE