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                 | kSecCSApplyEmbeddedPolicy
 129                 | kSecCSSkipRootVolumeExceptions
 130         );
 131
 132         if (errors)
 133                 flags |= kSecCSFullReport;      // internal-use flag
 134
 135 #if !TARGET_OS_OSX
 136         flags |= kSecCSApplyEmbeddedPolicy;
 137 #endif
 138
 139         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
 140         code->setValidationFlags(flags);
 141         const SecRequirement *req = SecRequirement::optional(requirementRef);
 142         DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
 143         code->staticValidate(flags, req);
 144
 145     // Everything checked out correctly but we need to make sure that when
 146     // we validated the code directory, we trusted the signer.  We defer this
 147     // until now because the caller may still trust the signer via a
 148     // provisioning profile so if we prematurely throw an error when validating
 149     // the directory, we potentially skip resource validation even though the
 150     // caller will go on to trust the signature
 151     // <rdar://problem/6075501> Applications that are validated against a provisioning profile do not have their resources checked
 152     if ((flags & kSecCSApplyEmbeddedPolicy) && code->trustedSigningCertChain() == false) {
 153         return CSError::cfError(errors, errSecCSSignatureUntrusted);
 154     }
 155
 156
 157         END_CSAPI_ERRORS
 158 }
 159
 160
 161 //
 162 // ====================================================================================
 163 //
 164 // The following API functions are called SecCode* but accept both SecCodeRef and
 165 // SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
 166 // Hence they're here, rather than in SecCode.cpp.
 167 //
 168
 169
 170 //
 171 // Retrieve location information for an StaticCode.
 172 //
 173 OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
 174 {
 175         BEGIN_CSAPI
 176
 177         checkFlags(flags);
 178         SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
 179         CodeSigning::Required(path) = staticCode->copyCanonicalPath();
 180
 181         END_CSAPI
 182 }
 183
 184
 185 //
 186 // Fetch or make up a designated requirement
 187 //
 188 OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 189         SecRequirementRef *requirementRef)
 190 {
 191         BEGIN_CSAPI
 192
 193         checkFlags(flags);
 194         const Requirement *req =
 195                 SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
 196         CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
 197
 198         END_CSAPI
 199 }
 200
 201
 202 //
 203 // Fetch a particular internal requirement, if present
 204 //
 205 OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
 206         SecCSFlags flags, SecRequirementRef *requirementRef)
 207 {
 208         BEGIN_CSAPI
 209
 210         checkFlags(flags);
 211         const Requirement *req =
 212                 SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
 213         CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
 214
 215         END_CSAPI
 216 }
 217
 218
 219 //
 220 // Record for future use a detached code signature.
 221 //
 222 OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
 223         SecCSFlags flags)
 224 {
 225         BEGIN_CSAPI
 226
 227         checkFlags(flags);
 228         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 229
 230         code->detachedSignature(signature); // ... and pass it to the code
 231         code->resetValidity();
 232
 233         END_CSAPI
 234 }
 235
 236
 237 //
 238 // Attach a code signature to a kernel memory mapping for page-in validation.
 239 //
 240 OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
 241 {
 242         BEGIN_CSAPI
 243
 244         checkFlags(flags);
 245         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 246         if (const CodeDirectory *cd = code->codeDirectory(false)) {
 247                 if (code->isDetached()) {
 248                         // Detached signatures need to attach their code directory from memory.
 249                         fsignatures args = { static_cast<off_t>(code->diskRep()->signingBase()), (void *)cd, cd->length() };
 250                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
 251                 } else {
 252                         // All other signatures can simply point to the signature in the main executable.
 253                         Universal *execImage = code->diskRep()->mainExecutableImage();
 254                         if (execImage == NULL) {
 255                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 256                         }
 257
 258                         unique_ptr<MachO> arch(execImage->architecture());
 259                         if (arch.get() == NULL) {
 260                                 MacOSError::throwMe(errSecCSNoMainExecutable);
 261                         }
 262
 263                         size_t signatureOffset = arch->signingOffset();
 264                         size_t signatureLength = arch->signingLength();
 265                         if (signatureOffset == 0) {
 266                                 MacOSError::throwMe(errSecCSUnsigned);
 267                         }
 268
 269                         fsignatures args = {
 270                                 static_cast<off_t>(code->diskRep()->signingBase()),
 271                                 (void *)signatureOffset,
 272                                 signatureLength,
 273                         };
 274                         UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDFILESIGS, &args));
 275                 }
 276         } else {
 277                 MacOSError::throwMe(errSecCSUnsigned);
 278         }
 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 }
 326
 327
 328 //
 329 // Retrieve a component object for a special slot directly.
 330 //
 331 CFDataRef SecCodeCopyComponent(SecCodeRef codeRef, int slot, CFDataRef hash)
 332 {
 333         BEGIN_CSAPI
 334
 335         SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
 336         return code->copyComponent(slot, hash);
 337
 338         END_CSAPI1(NULL)
 339 }
 340
 341
 342 //
 343 // Validate a single plain file's resource seal against a memory copy.
 344 // This will fail for any other file type (symlink, directory, nested code, etc. etc.)
 345 //
 346 OSStatus SecCodeValidateFileResource(SecStaticCodeRef codeRef, CFStringRef relativePath, CFDataRef fileData, SecCSFlags flags)
 347 {
 348     BEGIN_CSAPI
 349
 350     checkFlags(0);
 351     if (fileData == NULL)
 352         MacOSError::throwMe(errSecCSObjectRequired);
 353     SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 354     code->validatePlainMemoryResource(cfString(relativePath), fileData, flags);
 355
 356     END_CSAPI
 357
 358 }