OSX/libsecurity_keychain/lib/TrustStore.cpp

   1 /*
   2  * Copyright (c) 2002-2004,2011-2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   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,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //
  25 // TrustStore.h - Abstract interface to permanent user trust assignments
  26 //
  27 #include <security_keychain/TrustStore.h>
  28 #include <security_keychain/Globals.h>
  29 #include <security_keychain/Certificate.h>
  30 #include <security_keychain/KCCursor.h>
  31 #include <security_keychain/SecCFTypes.h>
  32 #include <security_cdsa_utilities/Schema.h>
  33 #include <Security/SecTrustSettingsPriv.h>
  34
  35 namespace Security {
  36 namespace KeychainCore {
  37
  38
  39 //
  40 // Make and break: trivial
  41 //
  42 TrustStore::TrustStore(Allocator &alloc)
  43         : allocator(alloc), mRootsValid(false), mRootBytes(allocator), mMutex(Mutex::recursive)
  44 {
  45 }
  46
  47 TrustStore::~TrustStore()
  48 { }
  49
  50 //
  51 // Retrieve the trust setting for a (certificate, policy) pair.
  52 //
  53 SecTrustUserSetting TrustStore::find(Certificate *cert, Policy *policy,
  54         StorageManager::KeychainList &keychainList)
  55 {
  56         StLock<Mutex> _(mMutex);
  57
  58         if (Item item = findItem(cert, policy, keychainList)) {
  59                 // Make sure that the certificate is available in some keychain,
  60                 // to provide a basis for editing the trust setting that we're returning.
  61                 if (cert->keychain() == NULL) {
  62                         if (cert->findInKeychain(keychainList) == NULL) {
  63                                 Keychain defaultKeychain = Keychain::optional(NULL);
  64                                 if (Keychain location = item->keychain()) {
  65                                         try {
  66                                                 cert->copyTo(location); // add cert to the trust item's keychain
  67                                         } catch (...) {
  68                                                 secinfo("trusteval", "failed to add certificate %p to keychain \"%s\"",
  69                                                         cert, location->name());
  70                                                 try {
  71                                                         if (&*location != &*defaultKeychain)
  72                                                                 cert->copyTo(defaultKeychain);  // try the default (if it's not the same)
  73                                                 } catch (...) {
  74                                                         // unable to add the certificate
  75                                                         secinfo("trusteval", "failed to add certificate %p to keychain \"%s\"",
  76                                                                 cert, defaultKeychain->name());
  77                                                 }
  78                                         }
  79                                 }
  80                         }
  81                 }
  82                 CssmDataContainer data;
  83                 item->getData(data);
  84                 if (data.length() != sizeof(TrustData))
  85                         MacOSError::throwMe(errSecInvalidTrustSetting);
  86                 TrustData &trust = *data.interpretedAs<TrustData>();
  87                 if (trust.version != UserTrustItem::currentVersion)
  88                         MacOSError::throwMe(errSecInvalidTrustSetting);
  89                 return trust.trust;
  90         } else {
  91                 return kSecTrustResultUnspecified;
  92         }
  93 }
  94
  95
  96 //
  97 // Set an individual trust element
  98 //
  99 void TrustStore::assign(Certificate *cert, Policy *policy, SecTrustUserSetting trust)
 100 {
 101         StLock<Mutex> _(mMutex);
 102
 103         TrustData trustData = { UserTrustItem::currentVersion, trust };
 104         Keychain defaultKeychain = Keychain::optional(NULL);
 105         Keychain trustLocation = defaultKeychain;       // default keychain, unless trust entry found
 106         StorageManager::KeychainList searchList;
 107         globals().storageManager.getSearchList(searchList);
 108
 109         if (Item item = findItem(cert, policy, searchList)) {
 110                 // user has a trust setting in a keychain - modify that
 111                 trustLocation = item->keychain();
 112                 if (trust == kSecTrustResultUnspecified)
 113                         item->keychain()->deleteItem(item);
 114                 else
 115                         item->modifyContent(NULL, sizeof(trustData), &trustData);
 116         } else {
 117                 // no trust entry: make one
 118                 if (trust != kSecTrustResultUnspecified) {
 119                         Item item = new UserTrustItem(cert, policy, trustData);
 120                         if (Keychain location = cert->keychain()) {
 121                                 try {
 122                                         location->add(item);                            // try the cert's keychain first
 123                                         trustLocation = location;
 124                                 } catch (...) {
 125                                         if (&*location != &*defaultKeychain)
 126                                                 defaultKeychain->add(item);             // try the default (if it's not the same)
 127                                 }
 128                         } else {
 129                                 defaultKeychain->add(item);                             // raw cert - use default keychain
 130                         }
 131                 }
 132         }
 133
 134         // Make sure that the certificate is available in some keychain,
 135         // to provide a basis for editing the trust setting that we're assigning.
 136         if (cert->keychain() == NULL) {
 137                 if (cert->findInKeychain(searchList) == NULL) {
 138                         try {
 139                                 cert->copyTo(trustLocation);    // add cert to the trust item's keychain
 140                         } catch (...) {
 141                                 secinfo("trusteval", "failed to add certificate %p to keychain \"%s\"",
 142                                         cert, trustLocation->name());
 143                                 try {
 144                                         if (&*trustLocation != &*defaultKeychain)
 145                                                 cert->copyTo(defaultKeychain);  // try the default (if it's not the same)
 146                                 } catch (...) {
 147                                         // unable to add the certificate
 148                                         secinfo("trusteval", "failed to add certificate %p to keychain \"%s\"",
 149                                                 cert, defaultKeychain->name());
 150                                 }
 151                         }
 152                 }
 153         }
 154 }
 155
 156
 157 //
 158 // Search the user's configured keychains for a trust setting.
 159 // If found, return it (as a TrustItem). Otherwise, return NULL.
 160 // Note that this function throws if a "real" error is encountered.
 161 //
 162 Item TrustStore::findItem(Certificate *cert, Policy *policy,
 163         StorageManager::KeychainList &keychainList)
 164 {
 165         // As of OS X 10.5, user trust records are no longer stored in keychains.
 166         // SecTrustSetUserTrust was replaced with SecTrustSettingsSetTrustSettings,
 167         // which stores per-user trust in a separate root-owned file. This method,
 168         // however, would continue to find old trust records created prior to 10.5.
 169         // Since those are increasingly unlikely to exist (and cannot be edited),
 170         // we no longer need or want to look for them anymore.
 171         return ((ItemImpl*)NULL);
 172
 173 #if 0
 174         StLock<Mutex> _(mMutex);
 175
 176         try {
 177                 SecKeychainAttribute attrs[2];
 178                 CssmAutoData certIndex(Allocator::standard());
 179                 UserTrustItem::makeCertIndex(cert, certIndex);
 180                 attrs[0].tag = kSecTrustCertAttr;
 181                 attrs[0].length = (UInt32)certIndex.length();
 182                 attrs[0].data = certIndex.data();
 183                 const CssmOid &policyOid = policy->oid();
 184                 attrs[1].tag = kSecTrustPolicyAttr;
 185                 attrs[1].length = (UInt32)policyOid.length();
 186                 attrs[1].data = policyOid.data();
 187                 SecKeychainAttributeList attrList = { 2, attrs };
 188                 KCCursor cursor(keychainList, CSSM_DL_DB_RECORD_USER_TRUST, &attrList);
 189                 Item item;
 190                 if (cursor->next(item))
 191                         return item;
 192         }
 193         catch (const CommonError &error) {}
 194
 195         return ((ItemImpl*)NULL);       // no trust schema, no records, no error
 196 #endif
 197 }
 198
 199 void TrustStore::getCssmRootCertificates(CertGroup &rootCerts)
 200 {
 201         StLock<Mutex> _(mMutex);
 202
 203         if (!mRootsValid)
 204                 loadRootCertificates();
 205         rootCerts = CertGroup(CSSM_CERT_X_509v3, CSSM_CERT_ENCODING_BER, CSSM_CERTGROUP_DATA);
 206         rootCerts.blobCerts() = &mRoots[0];
 207         rootCerts.count() = (uint32)mRoots.size();
 208 }
 209
 210 //
 211 // Load root (anchor) certificates from disk
 212 //
 213 void TrustStore::loadRootCertificates()
 214 {
 215         StLock<Mutex> _(mMutex);
 216
 217         CFRef<CFArrayRef> anchors;
 218         OSStatus ortn;
 219
 220         /*
 221          * Get the current set of all positively trusted anchors.
 222          */
 223         ortn = SecTrustSettingsCopyUnrestrictedRoots(
 224                 true, true, true,               /* all domains */
 225                 anchors.take());
 226         if(ortn) {
 227                 MacOSError::throwMe(ortn);
 228         }
 229
 230         // how many data bytes do we need?
 231         size_t size = 0;
 232         CFIndex numCerts = CFArrayGetCount(anchors);
 233         CSSM_RETURN crtn;
 234         for(CFIndex dex=0; dex<numCerts; dex++) {
 235                 SecCertificateRef certRef = (SecCertificateRef)CFArrayGetValueAtIndex(anchors, dex);
 236                 CSSM_DATA certData;
 237                 crtn = SecCertificateGetData(certRef, &certData);
 238                 if(crtn) {
 239                         CssmError::throwMe(crtn);
 240                 }
 241                 size += certData.Length;
 242         }
 243         mRootBytes.length(size);
 244
 245         // fill CssmData vector while copying data bytes together
 246         mRoots.clear();
 247         uint8 *base = mRootBytes.data<uint8>();
 248         for(CFIndex dex=0; dex<numCerts; dex++) {
 249                 SecCertificateRef certRef = (SecCertificateRef)CFArrayGetValueAtIndex(anchors, dex);
 250                 CSSM_DATA certData;
 251                 SecCertificateGetData(certRef, &certData);
 252                 memcpy(base, certData.Data, certData.Length);
 253                 mRoots.push_back(CssmData(base, certData.Length));
 254                 base += certData.Length;
 255         }
 256
 257         secinfo("anchors", "%ld anchors loaded", (long)numCerts);
 258
 259         mRootsValid = true;                     // ready to roll
 260 }
 261
 262 } // end namespace KeychainCore
 263 } // end namespace Security