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, kSecCSForceOnlineNotarizationCheck);
  56         CodeSigning::Required(staticCodeRef) = (new SecStaticCode(DiskRep::bestGuess(cfString(path).c_str()), flags))->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, kSecCSForceOnlineNotarizationCheck);
  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), flags))->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         BEGIN_CSAPI
 109
 110         checkFlags(flags,
 111                   kSecCSReportProgress
 112                 | kSecCSCheckAllArchitectures
 113                 | kSecCSDoNotValidateExecutable
 114                 | kSecCSDoNotValidateResources
 115                 | kSecCSConsiderExpiration
 116                 | kSecCSEnforceRevocationChecks
 117                 | kSecCSNoNetworkAccess
 118                 | kSecCSCheckNestedCode
 119                 | kSecCSStrictValidate
 120                 | kSecCSRestrictSidebandData
 121                 | kSecCSCheckGatekeeperArchitectures
 122                 | kSecCSRestrictSymlinks
 123                 | kSecCSRestrictToAppLike
 124         | kSecCSUseSoftwareSigningCert
 125             | kSecCSValidatePEH
 126                 | kSecCSSingleThreaded
 127         );
 128
 129         if (errors)
 130                 flags |= kSecCSFullReport;      // internal-use flag
 131
 132         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
 133         code->setValidationFlags(flags);
 134         const SecRequirement *req = SecRequirement::optional(requirementRef);
 135         DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
 136         code->staticValidate(flags, req);
 137
 138 #if TARGET_OS_IPHONE
 139     // Everything checked out correctly but we need to make sure that when
 140     // we validated the code directory, we trusted the signer.  We defer this
 141     // until now because the caller may still trust the signer via a
 142     // provisioning profile so if we prematurely throw an error when validating
 143     // the directory, we potentially skip resource validation even though the
 144     // caller will go on to trust the signature
 145     // <rdar://problem/6075501> Applications that are validated against a provisioning profile do not have their resources checked
 146     if (code->trustedSigningCertChain() == false) {
 147         return CSError::cfError(errors, errSecCSSignatureUntrusted);
 148     }
 149 #endif
 150
 151
 152         END_CSAPI_ERRORS
 153 }
 154
 155
 156 //
 157 // ====================================================================================
 158 //
 159 // The following API functions are called SecCode* but accept both SecCodeRef and
 160 // SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
 161 // Hence they're here, rather than in SecCode.cpp.
 162 //
 163
 164
 165 //
 166 // Retrieve location information for an StaticCode.
 167 //
 168 OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
 169 {
 170         BEGIN_CSAPI
 171
 172         checkFlags(flags);
 173         SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
 174         CodeSigning::Required(path) = staticCode->copyCanonicalPath();
 175
 176         END_CSAPI
 177 }
 178
 179
 180 //
 181 // Fetch or make up a designated requirement
 182 //
 183 OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 184         SecRequirementRef *requirementRef)
 185 {
 186         BEGIN_CSAPI
 187
 188         checkFlags(flags);
 189         const Requirement *req =
 190                 SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
 191         CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
 192
 193         END_CSAPI
 194 }
 195
 196
 197 //
 198 // Fetch a particular internal requirement, if present
 199 //
 200 OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
 201         SecCSFlags flags, SecRequirementRef *requirementRef)
 202 {
 203         BEGIN_CSAPI
 204
 205         checkFlags(flags);
 206         const Requirement *req =
 207                 SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
 208         CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
 209
 210         END_CSAPI
 211 }
 212
 213
 214 //
 215 // Record for future use a detached code signature.
 216 //
 217 OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
 218         SecCSFlags flags)
 219 {
 220         BEGIN_CSAPI
 221
 222         checkFlags(flags);
 223         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 224
 225         code->detachedSignature(signature); // ... and pass it to the code
 226         code->resetValidity();
 227
 228         END_CSAPI
 229 }
 230
 231
 232 //
 233 // Attach a code signature to a kernel memory mapping for page-in validation.
 234 //
 235 OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
 236 {
 237         BEGIN_CSAPI
 238
 239         checkFlags(flags);
 240         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 241         if (const CodeDirectory *cd = code->codeDirectory(false)) {
 242                 if (code->isDetached()) {
 243                         // Detached signatures need to attach their code directory from memory.
 244                         fsignatures args = { static_cast<off_t>(code->diskRep()->signingBase()), (void *)cd, cd->length() };
 245                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
 246                 } else {
 247                         // All other signatures can simply point to the signature in the main executable.
 248                         Universal *execImage = code->diskRep()->mainExecutableImage();
 249                         if (execImage == NULL) {
 250                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 251                         }
 252
 253                         auto_ptr<MachO> arch(execImage->architecture());
 254                         if (arch.get() == NULL) {
 255                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 256                         }
 257
 258                         size_t signatureOffset = arch->signingOffset();
 259                         size_t signatureLength = arch->signingLength();
 260                         if (signatureOffset == 0) {
 261                                 MacOSError::throwMe(errSecCSUnsigned);
 262                         }
 263
 264                         fsignatures args = {
 265                                 static_cast<off_t>(code->diskRep()->signingBase()),
 266                                 (void *)signatureOffset,
 267                                 signatureLength,
 268                         };
 269                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDFILESIGS, &args));
 270                 }
 271         } else {
 272                 MacOSError::throwMe(errSecCSUnsigned);
 273         }
 274
 275         END_CSAPI
 276 }
 277
 278
 279 //
 280 // Attach a callback block to a code object
 281 //
 282 OSStatus SecStaticCodeSetCallback(SecStaticCodeRef codeRef, SecCSFlags flags, SecCodeCallback *old, SecCodeCallback monitor)
 283 {
 284         BEGIN_CSAPI
 285
 286         checkFlags(flags);
 287         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 288         if (old)
 289                 *old = code->monitor();
 290         code->setMonitor(monitor);
 291
 292         END_CSAPI
 293 }
 294
 295
 296 OSStatus SecStaticCodeSetValidationConditions(SecStaticCodeRef codeRef, CFDictionaryRef conditions)
 297 {
 298         BEGIN_CSAPI
 299
 300         checkFlags(0);
 301         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 302         code->setValidationModifiers(conditions);
 303
 304         END_CSAPI
 305 }
 306
 307
 308 //
 309 // Set cancellation flag on a static code object.
 310 //
 311 OSStatus SecStaticCodeCancelValidation(SecStaticCodeRef codeRef, SecCSFlags flags)
 312 {
 313         BEGIN_CSAPI
 314
 315         checkFlags(0);
 316         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 317         code->cancelValidation();
 318
 319         END_CSAPI
 320 }
 321
 322
 323 //
 324 // Retrieve a component object for a special slot directly.
 325 //
 326 CFDataRef SecCodeCopyComponent(SecCodeRef codeRef, int slot, CFDataRef hash)
 327 {
 328         BEGIN_CSAPI
 329
 330         SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
 331         return code->copyComponent(slot, hash);
 332
 333         END_CSAPI1(NULL)
 334 }
 335
 336
 337 //
 338 // Validate a single plain file's resource seal against a memory copy.
 339 // This will fail for any other file type (symlink, directory, nested code, etc. etc.)
 340 //
 341 OSStatus SecCodeValidateFileResource(SecStaticCodeRef codeRef, CFStringRef relativePath, CFDataRef fileData, SecCSFlags flags)
 342 {
 343     BEGIN_CSAPI
 344
 345     checkFlags(0);
 346     if (fileData == NULL)
 347         MacOSError::throwMe(errSecCSObjectRequired);
 348     SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 349     code->validatePlainMemoryResource(cfString(relativePath), fileData, flags);
 350
 351     END_CSAPI
 352
 353 }