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                 | kSecCSStrictValidateStructure
 121                 | kSecCSRestrictSidebandData
 122                 | kSecCSCheckGatekeeperArchitectures
 123                 | kSecCSRestrictSymlinks
 124                 | kSecCSRestrictToAppLike
 125         | kSecCSUseSoftwareSigningCert
 126             | kSecCSValidatePEH
 127                 | kSecCSSingleThreaded
 128         );
 129
 130         if (errors)
 131                 flags |= kSecCSFullReport;      // internal-use flag
 132
 133         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
 134         code->setValidationFlags(flags);
 135         const SecRequirement *req = SecRequirement::optional(requirementRef);
 136         DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
 137         code->staticValidate(flags, req);
 138
 139 #if TARGET_OS_IPHONE
 140     // Everything checked out correctly but we need to make sure that when
 141     // we validated the code directory, we trusted the signer.  We defer this
 142     // until now because the caller may still trust the signer via a
 143     // provisioning profile so if we prematurely throw an error when validating
 144     // the directory, we potentially skip resource validation even though the
 145     // caller will go on to trust the signature
 146     // <rdar://problem/6075501> Applications that are validated against a provisioning profile do not have their resources checked
 147     if (code->trustedSigningCertChain() == false) {
 148         return CSError::cfError(errors, errSecCSSignatureUntrusted);
 149     }
 150 #endif
 151
 152
 153         END_CSAPI_ERRORS
 154 }
 155
 156
 157 //
 158 // ====================================================================================
 159 //
 160 // The following API functions are called SecCode* but accept both SecCodeRef and
 161 // SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
 162 // Hence they're here, rather than in SecCode.cpp.
 163 //
 164
 165
 166 //
 167 // Retrieve location information for an StaticCode.
 168 //
 169 OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
 170 {
 171         BEGIN_CSAPI
 172
 173         checkFlags(flags);
 174         SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
 175         CodeSigning::Required(path) = staticCode->copyCanonicalPath();
 176
 177         END_CSAPI
 178 }
 179
 180
 181 //
 182 // Fetch or make up a designated requirement
 183 //
 184 OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 185         SecRequirementRef *requirementRef)
 186 {
 187         BEGIN_CSAPI
 188
 189         checkFlags(flags);
 190         const Requirement *req =
 191                 SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
 192         CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
 193
 194         END_CSAPI
 195 }
 196
 197
 198 //
 199 // Fetch a particular internal requirement, if present
 200 //
 201 OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
 202         SecCSFlags flags, SecRequirementRef *requirementRef)
 203 {
 204         BEGIN_CSAPI
 205
 206         checkFlags(flags);
 207         const Requirement *req =
 208                 SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
 209         CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
 210
 211         END_CSAPI
 212 }
 213
 214
 215 //
 216 // Record for future use a detached code signature.
 217 //
 218 OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
 219         SecCSFlags flags)
 220 {
 221         BEGIN_CSAPI
 222
 223         checkFlags(flags);
 224         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 225
 226         code->detachedSignature(signature); // ... and pass it to the code
 227         code->resetValidity();
 228
 229         END_CSAPI
 230 }
 231
 232
 233 //
 234 // Attach a code signature to a kernel memory mapping for page-in validation.
 235 //
 236 OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
 237 {
 238         BEGIN_CSAPI
 239
 240         checkFlags(flags);
 241         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 242         if (const CodeDirectory *cd = code->codeDirectory(false)) {
 243                 if (code->isDetached()) {
 244                         // Detached signatures need to attach their code directory from memory.
 245                         fsignatures args = { static_cast<off_t>(code->diskRep()->signingBase()), (void *)cd, cd->length() };
 246                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
 247                 } else {
 248                         // All other signatures can simply point to the signature in the main executable.
 249                         Universal *execImage = code->diskRep()->mainExecutableImage();
 250                         if (execImage == NULL) {
 251                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 252                         }
 253
 254                         auto_ptr<MachO> arch(execImage->architecture());
 255                         if (arch.get() == NULL) {
 256                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 257                         }
 258
 259                         size_t signatureOffset = arch->signingOffset();
 260                         size_t signatureLength = arch->signingLength();
 261                         if (signatureOffset == 0) {
 262                                 MacOSError::throwMe(errSecCSUnsigned);
 263                         }
 264
 265                         fsignatures args = {
 266                                 static_cast<off_t>(code->diskRep()->signingBase()),
 267                                 (void *)signatureOffset,
 268                                 signatureLength,
 269                         };
 270                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDFILESIGS, &args));
 271                 }
 272         } else {
 273                 MacOSError::throwMe(errSecCSUnsigned);
 274         }
 275
 276         END_CSAPI
 277 }
 278
 279
 280 //
 281 // Attach a callback block to a code object
 282 //
 283 OSStatus SecStaticCodeSetCallback(SecStaticCodeRef codeRef, SecCSFlags flags, SecCodeCallback *old, SecCodeCallback monitor)
 284 {
 285         BEGIN_CSAPI
 286
 287         checkFlags(flags);
 288         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 289         if (old)
 290                 *old = code->monitor();
 291         code->setMonitor(monitor);
 292
 293         END_CSAPI
 294 }
 295
 296
 297 OSStatus SecStaticCodeSetValidationConditions(SecStaticCodeRef codeRef, CFDictionaryRef conditions)
 298 {
 299         BEGIN_CSAPI
 300
 301         checkFlags(0);
 302         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 303         code->setValidationModifiers(conditions);
 304
 305         END_CSAPI
 306 }
 307
 308
 309 //
 310 // Set cancellation flag on a static code object.
 311 //
 312 OSStatus SecStaticCodeCancelValidation(SecStaticCodeRef codeRef, SecCSFlags flags)
 313 {
 314         BEGIN_CSAPI
 315
 316         checkFlags(0);
 317         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 318         code->cancelValidation();
 319
 320         END_CSAPI
 321 }
 322
 323
 324 //
 325 // Retrieve a component object for a special slot directly.
 326 //
 327 CFDataRef SecCodeCopyComponent(SecCodeRef codeRef, int slot, CFDataRef hash)
 328 {
 329         BEGIN_CSAPI
 330
 331         SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
 332         return code->copyComponent(slot, hash);
 333
 334         END_CSAPI1(NULL)
 335 }
 336
 337
 338 //
 339 // Validate a single plain file's resource seal against a memory copy.
 340 // This will fail for any other file type (symlink, directory, nested code, etc. etc.)
 341 //
 342 OSStatus SecCodeValidateFileResource(SecStaticCodeRef codeRef, CFStringRef relativePath, CFDataRef fileData, SecCSFlags flags)
 343 {
 344     BEGIN_CSAPI
 345
 346     checkFlags(0);
 347     if (fileData == NULL)
 348         MacOSError::throwMe(errSecCSObjectRequired);
 349     SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 350     code->validatePlainMemoryResource(cfString(relativePath), fileData, flags);
 351
 352     END_CSAPI
 353
 354 }