OSX/libsecurity_codesigning/lib/SecStaticCode.cpp

   1 /*
   2  * Copyright (c) 2006-2007,2011-2015 Apple Inc. All Rights Reserved.
   3  *
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   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,
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  18  * Please see the License for the specific language governing rights and
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  23
  24 //
  25 // SecStaticCode - API frame for SecStaticCode objects
  26 //
  27 #include "cs.h"
  28 #include "StaticCode.h"
  29 #include <security_utilities/cfmunge.h>
  30 #include <security_utilities/logging.h>
  31 #include <fcntl.h>
  32 #include <dirent.h>
  33
  34 using namespace CodeSigning;
  35
  36
  37 //
  38 // CF-standard type code function
  39 //
  40 CFTypeID SecStaticCodeGetTypeID(void)
  41 {
  42         BEGIN_CSAPI
  43         return gCFObjects().StaticCode.typeID;
  44     END_CSAPI1(_kCFRuntimeNotATypeID)
  45 }
  46
  47
  48 //
  49 // Create an StaticCode directly from disk path.
  50 //
  51 OSStatus SecStaticCodeCreateWithPath(CFURLRef path, SecCSFlags flags, SecStaticCodeRef *staticCodeRef)
  52 {
  53         BEGIN_CSAPI
  54
  55         checkFlags(flags);
  56         CodeSigning::Required(staticCodeRef) = (new SecStaticCode(DiskRep::bestGuess(cfString(path).c_str())))->handle();
  57
  58         END_CSAPI
  59 }
  60
  61 const CFStringRef kSecCodeAttributeArchitecture =       CFSTR("architecture");
  62 const CFStringRef kSecCodeAttributeSubarchitecture =CFSTR("subarchitecture");
  63 const CFStringRef kSecCodeAttributeBundleVersion =      CFSTR("bundleversion");
  64 const CFStringRef kSecCodeAttributeUniversalFileOffset =        CFSTR("UniversalFileOffset");
  65
  66 OSStatus SecStaticCodeCreateWithPathAndAttributes(CFURLRef path, SecCSFlags flags, CFDictionaryRef attributes,
  67         SecStaticCodeRef *staticCodeRef)
  68 {
  69         BEGIN_CSAPI
  70
  71         checkFlags(flags);
  72         DiskRep::Context ctx;
  73         std::string version; // holds memory placed into ctx
  74         if (attributes) {
  75                 std::string archName;
  76                 int archNumber, subarchNumber, offset;
  77                 if (cfscan(attributes, "{%O=%d}", kSecCodeAttributeUniversalFileOffset, &offset)) {
  78                         ctx.offset = offset;
  79                 } else if (cfscan(attributes, "{%O=%s}", kSecCodeAttributeArchitecture, &archName)) {
  80                         ctx.arch = Architecture(archName.c_str());
  81                 } else if (cfscan(attributes, "{%O=%d,%O=%d}",
  82                                 kSecCodeAttributeArchitecture, &archNumber, kSecCodeAttributeSubarchitecture, &subarchNumber))
  83                         ctx.arch = Architecture(archNumber, subarchNumber);
  84                 else if (cfscan(attributes, "{%O=%d}", kSecCodeAttributeArchitecture, &archNumber))
  85                         ctx.arch = Architecture(archNumber);
  86                 if (cfscan(attributes, "{%O=%s}", kSecCodeAttributeBundleVersion, &version))
  87                         ctx.version = version.c_str();
  88         }
  89
  90         CodeSigning::Required(staticCodeRef) = (new SecStaticCode(DiskRep::bestGuess(cfString(path).c_str(), &ctx)))->handle();
  91
  92         END_CSAPI
  93 }
  94
  95
  96 //
  97 // Check static validity of a StaticCode
  98 //
  99 OSStatus SecStaticCodeCheckValidity(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 100         SecRequirementRef requirementRef)
 101 {
 102         return SecStaticCodeCheckValidityWithErrors(staticCodeRef, flags, requirementRef, NULL);
 103 }
 104
 105 OSStatus SecStaticCodeCheckValidityWithErrors(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 106         SecRequirementRef requirementRef, CFErrorRef *errors)
 107 {
 108 #if !SECTRUST_OSX
 109         BEGIN_CSAPI
 110
 111         checkFlags(flags,
 112                   kSecCSReportProgress
 113                 | kSecCSCheckAllArchitectures
 114                 | kSecCSDoNotValidateExecutable
 115                 | kSecCSDoNotValidateResources
 116                 | kSecCSConsiderExpiration
 117         | kSecCSEnforceRevocationChecks
 118                 | kSecCSNoNetworkAccess
 119                 | kSecCSCheckNestedCode
 120                 | kSecCSStrictValidate
 121                 | kSecCSCheckGatekeeperArchitectures
 122                 | kSecCSRestrictSymlinks
 123                 | kSecCSRestrictToAppLike
 124         );
 125
 126         if (errors)
 127                 flags |= kSecCSFullReport;      // internal-use flag
 128
 129         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
 130         code->setValidationFlags(flags);
 131         const SecRequirement *req = SecRequirement::optional(requirementRef);
 132         DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
 133         code->staticValidate(flags, req);
 134
 135         END_CSAPI_ERRORS
 136 #else
 137 #warning resolve before enabling SECTRUST_OSX: <rdar://21328880>
 138         OSStatus result = errSecSuccess;
 139         const char *func = "SecStaticCodeCheckValidity";
 140         CFErrorRef localErrors = NULL;
 141         if (!errors) { errors = &localErrors; }
 142         try {
 143                 checkFlags(flags,
 144                           kSecCSReportProgress
 145                         | kSecCSCheckAllArchitectures
 146                         | kSecCSDoNotValidateExecutable
 147                         | kSecCSDoNotValidateResources
 148                         | kSecCSConsiderExpiration
 149                         | kSecCSEnforceRevocationChecks
 150                         | kSecCSNoNetworkAccess
 151                         | kSecCSCheckNestedCode
 152                         | kSecCSStrictValidate
 153                         | kSecCSCheckGatekeeperArchitectures
 154                 );
 155
 156                 if (errors)
 157                         flags |= kSecCSFullReport;      // internal-use flag
 158
 159                 SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
 160                 code->setValidationFlags(flags);
 161                 const SecRequirement *req = SecRequirement::optional(requirementRef);
 162                 DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
 163                 code->staticValidate(flags, req);
 164         }
 165         catch (...) {
 166                 // the actual error being thrown is not being caught by any of the
 167                 // type-specific blocks contained in the END_CSAPI_ERRORS macro,
 168                 // so we only have the catch-all block here for now.
 169                 result = errSecCSInternalError;
 170         }
 171
 172         if (errors && *errors) {
 173                 CFShow(errors);
 174                 CFRelease(errors);
 175                 *errors = NULL;
 176         }
 177         if (result == errSecCSInternalError) {
 178         #if !NDEBUG
 179                 Security::Syslog::error("WARNING: %s ignored error %d", func, (int)result);
 180         #endif
 181                 result = errSecSuccess;
 182         }
 183         return result;
 184
 185 #endif
 186 }
 187
 188
 189 //
 190 // ====================================================================================
 191 //
 192 // The following API functions are called SecCode* but accept both SecCodeRef and
 193 // SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
 194 // Hence they're here, rather than in SecCode.cpp.
 195 //
 196
 197
 198 //
 199 // Retrieve location information for an StaticCode.
 200 //
 201 OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
 202 {
 203         BEGIN_CSAPI
 204
 205         checkFlags(flags);
 206         SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
 207         CodeSigning::Required(path) = staticCode->copyCanonicalPath();
 208
 209         END_CSAPI
 210 }
 211
 212
 213 //
 214 // Fetch or make up a designated requirement
 215 //
 216 OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 217         SecRequirementRef *requirementRef)
 218 {
 219         BEGIN_CSAPI
 220
 221         checkFlags(flags);
 222         const Requirement *req =
 223                 SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
 224         CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
 225
 226         END_CSAPI
 227 }
 228
 229
 230 //
 231 // Fetch a particular internal requirement, if present
 232 //
 233 OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
 234         SecCSFlags flags, SecRequirementRef *requirementRef)
 235 {
 236         BEGIN_CSAPI
 237
 238         checkFlags(flags);
 239         const Requirement *req =
 240                 SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
 241         CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
 242
 243         END_CSAPI
 244 }
 245
 246
 247 //
 248 // Record for future use a detached code signature.
 249 //
 250 OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
 251         SecCSFlags flags)
 252 {
 253         BEGIN_CSAPI
 254
 255         checkFlags(flags);
 256         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 257
 258         code->detachedSignature(signature); // ... and pass it to the code
 259         code->resetValidity();
 260
 261         END_CSAPI
 262 }
 263
 264
 265 //
 266 // Attach a code signature to a kernel memory mapping for page-in validation.
 267 //
 268 OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
 269 {
 270         BEGIN_CSAPI
 271
 272         checkFlags(flags);
 273         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 274         if (const CodeDirectory *cd = code->codeDirectory(false)) {
 275                 fsignatures args = { code->diskRep()->signingBase(), (void *)cd, cd->length() };
 276                 UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
 277         } else
 278                 MacOSError::throwMe(errSecCSUnsigned);
 279
 280         END_CSAPI
 281 }
 282
 283
 284 //
 285 // Attach a callback block to a code object
 286 //
 287 OSStatus SecStaticCodeSetCallback(SecStaticCodeRef codeRef, SecCSFlags flags, SecCodeCallback *old, SecCodeCallback monitor)
 288 {
 289         BEGIN_CSAPI
 290
 291         checkFlags(flags);
 292         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 293         if (old)
 294                 *old = code->monitor();
 295         code->setMonitor(monitor);
 296
 297         END_CSAPI
 298 }
 299
 300
 301 OSStatus SecStaticCodeSetValidationConditions(SecStaticCodeRef codeRef, CFDictionaryRef conditions)
 302 {
 303         BEGIN_CSAPI
 304
 305         checkFlags(0);
 306         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 307         code->setValidationModifiers(conditions);
 308
 309         END_CSAPI
 310 }
 311
 312
 313 //
 314 // Set cancellation flag on a static code object.
 315 //
 316 OSStatus SecStaticCodeCancelValidation(SecStaticCodeRef codeRef, SecCSFlags flags)
 317 {
 318         BEGIN_CSAPI
 319
 320         checkFlags(0);
 321         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 322         code->cancelValidation();
 323
 324         END_CSAPI
 325 }