OSX/libsecurity_codesigning/lib/csgeneric.cpp

   1 /*
   2  * Copyright (c) 2006-2007,2011-2012 Apple Inc. All Rights Reserved.
   3  *
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   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 // csgeneric - generic Code representative
  26 //
  27 #include "csgeneric.h"
  28 #include "cs.h"
  29 #include "StaticCode.h"
  30 #include <securityd_client/cshosting.h>
  31 #include <sys/param.h>
  32
  33 namespace Security {
  34 namespace CodeSigning {
  35
  36 using MachPlusPlus::Port;
  37
  38
  39 //
  40 // Common call-out code for cshosting RPC service
  41 //
  42 #define CALL(host, name, args...) \
  43         OSStatus result; \
  44         if (cshosting_client_ ## name (host, mig_get_reply_port(), &result, args)) \
  45                 MacOSError::throwMe(errSecCSNotAHost); \
  46         MacOSError::check(result);
  47
  48
  49 //
  50 // Construct a running process representation
  51 //
  52 GenericCode::GenericCode(SecCode *host, SecGuestRef guestRef)
  53         : SecCode(host), mGuestRef(guestRef)
  54 {
  55 }
  56
  57
  58 //
  59 // Identify a guest by attribute set, and return a new GenericCode representing it.
  60 // This uses cshosting RPCs to ask the host (or its proxy).
  61 //
  62 SecCode *GenericCode::locateGuest(CFDictionaryRef attributes)
  63 {
  64         if (Port host = hostingPort()) {
  65                 CFRef<CFDataRef> attrData;
  66                 void *attrPtr = NULL; size_t attrLength = 0;
  67                 if (attributes) {
  68                         attrData.take(CFPropertyListCreateXMLData(NULL, attributes));
  69                         attrPtr = (void *)CFDataGetBytePtr(attrData);
  70                         attrLength = CFDataGetLength(attrData);
  71                 }
  72                 GuestChain guestPath;
  73                 mach_msg_type_number_t guestPathLength;
  74                 mach_port_t subport;
  75                 CALL(host, findGuest, guestRef(), attrPtr, (mach_msg_type_number_t)attrLength,
  76                         &guestPath, &guestPathLength, &subport);
  77                 CODESIGN_GUEST_LOCATE_GENERIC(this, guestPath, guestPathLength, subport);
  78                 SecPointer<SecCode> code = this;
  79                 for (unsigned n = 0; n < guestPathLength; n++)
  80                         code = new GenericCode(code, guestPath[n]);
  81                 return code.yield();
  82         } else
  83                 return NULL;            // not found, no error
  84 }
  85
  86
  87 //
  88 // Identify a guest by returning its StaticCode and running CodeDirectory hash.
  89 // This uses cshosting RPCs to ask the host (or its proxy).
  90 //
  91 SecStaticCode *GenericCode::identifyGuest(SecCode *guest, CFDataRef *cdhashOut)
  92 {
  93         if (GenericCode *iguest = dynamic_cast<GenericCode *>(guest)) {
  94                 FilePathOut path;
  95                 CFRef<CFDataRef> cdhash;
  96                 CFDictionary attributes(errSecCSHostProtocolInvalidAttribute);
  97                 identifyGuest(iguest->guestRef(), path, cdhash.aref(), attributes.aref());
  98                 DiskRep::Context ctx;
  99                 if (CFNumberRef architecture = attributes.get<CFNumberRef>(kSecGuestAttributeArchitecture)) {
 100                         cpu_type_t cpu = cfNumber<cpu_type_t>(architecture);
 101                         if (CFNumberRef subarchitecture = attributes.get<CFNumberRef>(kSecGuestAttributeSubarchitecture))
 102                                 ctx.arch = Architecture(cpu, cfNumber<cpu_subtype_t>(subarchitecture));
 103                         else
 104                                 ctx.arch = Architecture(cpu);
 105                 }
 106                 SecPointer<GenericStaticCode> code = new GenericStaticCode(DiskRep::bestGuess(path, &ctx));
 107                 CODESIGN_GUEST_IDENTIFY_GENERIC(iguest, iguest->guestRef(), code);
 108                 if (cdhash) {
 109                         CODESIGN_GUEST_CDHASH_GENERIC(iguest, (void *)CFDataGetBytePtr(cdhash), (unsigned)CFDataGetLength(cdhash));
 110                         *cdhashOut = cdhash.yield();
 111                 }
 112                 return code.yield();
 113         } else
 114                 MacOSError::throwMe(errSecCSNotAHost);
 115 }
 116
 117 // helper to drive the identifyGuest hosting IPC and return results as CF objects
 118 void GenericCode::identifyGuest(SecGuestRef guest, char *path, CFDataRef &cdhash, CFDictionaryRef &attributes)
 119 {
 120         if (Port host = hostingPort()) {
 121                 HashDataOut hash;
 122                 uint32_t hashLength;
 123                 XMLBlobOut attr;
 124                 uint32_t attrLength;
 125                 CALL(host, identifyGuest, guest, path, hash, &hashLength, &attr, &attrLength);
 126                 if (hashLength)
 127                         cdhash = makeCFData(hash, hashLength);
 128                 if (attrLength) {
 129                         CFRef<CFDataRef> attrData = makeCFData(attr, attrLength);
 130                         attributes = makeCFDictionaryFrom(attrData);
 131 #if ROSETTA_TEST_HACK
 132                         CFMutableDictionaryRef hattr = makeCFMutableDictionary(attributes);
 133                         CFDictionaryAddValue(hattr, kSecGuestAttributeArchitecture, CFTempNumber(CPU_TYPE_POWERPC));
 134                         CFRelease(attributes);
 135                         attributes = hattr;
 136 #endif
 137                 }
 138         } else
 139                 MacOSError::throwMe(errSecCSNotAHost);
 140 }
 141
 142
 143 //
 144 // Get the Code Signing Status Word for a Code.
 145 // This uses cshosting RPCs to ask the host (or its proxy).
 146 //
 147 SecCodeStatus GenericCode::getGuestStatus(SecCode *guest)
 148 {
 149         if (Port host = hostingPort()) {
 150                 uint32_t status;
 151                 CALL(host, guestStatus, safe_cast<GenericCode *>(guest)->guestRef(), &status);
 152                 return status;
 153         } else
 154                 MacOSError::throwMe(errSecCSNotAHost);
 155 }
 156
 157
 158 //
 159 // Status changes are transmitted through the cshosting RPCs.
 160 //
 161 void GenericCode::changeGuestStatus(SecCode *iguest, SecCodeStatusOperation operation, CFDictionaryRef arguments)
 162 {
 163         if (/* GenericCode *guest = */dynamic_cast<GenericCode *>(iguest))
 164                 switch (operation) {
 165                 case kSecCodeOperationNull:
 166                         break;
 167                 case kSecCodeOperationInvalidate:
 168                 case kSecCodeOperationSetHard:
 169                 case kSecCodeOperationSetKill:
 170                         MacOSError::throwMe(errSecCSUnimplemented);
 171                         break;
 172                 default:
 173                         MacOSError::throwMe(errSecCSUnimplemented);
 174                 }
 175         else
 176                 MacOSError::throwMe(errSecCSNoSuchCode);
 177 }
 178
 179
 180 //
 181 // Return the Hosting Port for this Code.
 182 // May return MACH_PORT_NULL if the code is not a code host.
 183 // Throws if we can't get the hosting port for some reason (and can't positively
 184 // determine that there is none).
 185 //
 186 // Note that we do NOT cache negative outcomes. Being a host is a dynamic property,
 187 // and this Code may not have commenced hosting operations yet. For non- (or not-yet-)hosts
 188 // we simply return NULL.
 189 //
 190 Port GenericCode::hostingPort()
 191 {
 192         if (!mHostingPort) {
 193                 if (staticCode()->codeDirectory()->flags & kSecCodeSignatureHost) {
 194                         mHostingPort = getHostingPort();
 195                         CODESIGN_GUEST_HOSTINGPORT(this, mHostingPort);
 196                 }
 197         }
 198         return mHostingPort;
 199 }
 200
 201
 202 //
 203 // A pure GenericHost has no idea where to get a hosting port from.
 204 // This method must be overridden to get one.
 205 // However, we do handle a contiguous chain of GenericCodes by deferring
 206 // to our next-higher host for it.
 207 //
 208 mach_port_t GenericCode::getHostingPort()
 209 {
 210         if (GenericCode *genericHost = dynamic_cast<GenericCode *>(host()))
 211                 return genericHost->getHostingPort();
 212         else
 213                 MacOSError::throwMe(errSecCSNotAHost);
 214 }
 215
 216
 217 } // CodeSigning
 218 } // Security