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         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         );
 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 }
 137
 138
 139 //
 140 // ====================================================================================
 141 //
 142 // The following API functions are called SecCode* but accept both SecCodeRef and
 143 // SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
 144 // Hence they're here, rather than in SecCode.cpp.
 145 //
 146
 147
 148 //
 149 // Retrieve location information for an StaticCode.
 150 //
 151 OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
 152 {
 153         BEGIN_CSAPI
 154
 155         checkFlags(flags);
 156         SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
 157         CodeSigning::Required(path) = staticCode->copyCanonicalPath();
 158
 159         END_CSAPI
 160 }
 161
 162
 163 //
 164 // Fetch or make up a designated requirement
 165 //
 166 OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
 167         SecRequirementRef *requirementRef)
 168 {
 169         BEGIN_CSAPI
 170
 171         checkFlags(flags);
 172         const Requirement *req =
 173                 SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
 174         CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
 175
 176         END_CSAPI
 177 }
 178
 179
 180 //
 181 // Fetch a particular internal requirement, if present
 182 //
 183 OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
 184         SecCSFlags flags, SecRequirementRef *requirementRef)
 185 {
 186         BEGIN_CSAPI
 187
 188         checkFlags(flags);
 189         const Requirement *req =
 190                 SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
 191         CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
 192
 193         END_CSAPI
 194 }
 195
 196
 197 //
 198 // Record for future use a detached code signature.
 199 //
 200 OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
 201         SecCSFlags flags)
 202 {
 203         BEGIN_CSAPI
 204
 205         checkFlags(flags);
 206         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 207
 208         code->detachedSignature(signature); // ... and pass it to the code
 209         code->resetValidity();
 210
 211         END_CSAPI
 212 }
 213
 214
 215 //
 216 // Attach a code signature to a kernel memory mapping for page-in validation.
 217 //
 218 OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
 219 {
 220         BEGIN_CSAPI
 221
 222         checkFlags(flags);
 223         SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
 224         if (const CodeDirectory *cd = code->codeDirectory(false)) {
 225                 fsignatures args = { code->diskRep()->signingBase(), (void *)cd, cd->length() };
 226                 UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
 227         } else
 228                 MacOSError::throwMe(errSecCSUnsigned);
 229
 230         END_CSAPI
 231 }
 232
 233
 234 //
 235 // Attach a callback block to a code object
 236 //
 237 OSStatus SecStaticCodeSetCallback(SecStaticCodeRef codeRef, SecCSFlags flags, SecCodeCallback *old, SecCodeCallback monitor)
 238 {
 239         BEGIN_CSAPI
 240
 241         checkFlags(flags);
 242         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 243         if (old)
 244                 *old = code->monitor();
 245         code->setMonitor(monitor);
 246
 247         END_CSAPI
 248 }
 249
 250
 251 OSStatus SecStaticCodeSetValidationConditions(SecStaticCodeRef codeRef, CFDictionaryRef conditions)
 252 {
 253         BEGIN_CSAPI
 254
 255         checkFlags(0);
 256         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 257         code->setValidationModifiers(conditions);
 258
 259         END_CSAPI
 260 }
 261
 262
 263 //
 264 // Set cancellation flag on a static code object.
 265 //
 266 OSStatus SecStaticCodeCancelValidation(SecStaticCodeRef codeRef, SecCSFlags flags)
 267 {
 268         BEGIN_CSAPI
 269
 270         checkFlags(0);
 271         SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 272         code->cancelValidation();
 273
 274         END_CSAPI
 275 }
 276
 277
 278 //
 279 // Retrieve a component object for a special slot directly.
 280 //
 281 CFDataRef SecCodeCopyComponent(SecCodeRef codeRef, int slot, CFDataRef hash)
 282 {
 283         BEGIN_CSAPI
 284
 285         SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
 286         return code->copyComponent(slot, hash);
 287
 288         END_CSAPI1(NULL)
 289 }
 290
 291
 292 //
 293 // Validate a single plain file's resource seal against a memory copy.
 294 // This will fail for any other file type (symlink, directory, nested code, etc. etc.)
 295 //
 296 OSStatus SecCodeValidateFileResource(SecStaticCodeRef codeRef, CFStringRef relativePath, CFDataRef fileData, SecCSFlags flags)
 297 {
 298     BEGIN_CSAPI
 299
 300     checkFlags(0);
 301     if (fileData == NULL)
 302         MacOSError::throwMe(errSecCSObjectRequired);
 303     SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
 304     code->validatePlainMemoryResource(cfString(relativePath), fileData, flags);
 305
 306     END_CSAPI
 307
 308 }