--- /dev/null
+/*
+ * Copyright (c) 2000-2009,2012-2013 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// acls - securityd ACL implementation
+//
+#include "acls.h"
+#include "connection.h"
+#include "server.h"
+#include "agentquery.h"
+#include "tokendatabase.h"
+#include "acl_keychain.h"
+
+// ACL subjects whose Environments we implement
+#include <security_cdsa_utilities/acl_any.h>
+#include <security_cdsa_utilities/acl_password.h>
+#include <security_cdsa_utilities/acl_threshold.h>
+
+#include <sys/sysctl.h>
+#include <security_utilities/logging.h>
+
+//
+// SecurityServerAcl is virtual
+//
+SecurityServerAcl::~SecurityServerAcl()
+{ }
+
+
+//
+// The default implementation of the ACL interface simply uses the local ObjectAcl
+// data. You can customize this by implementing instantiateAcl() [from ObjectAcl]
+// or by overriding these methods as desired.
+// Note: While you can completely ignore the ObjectAcl personality if you wish, it's
+// usually smarter to adapt it.
+//
+void SecurityServerAcl::getOwner(AclOwnerPrototype &owner)
+{
+ StLock<Mutex> _(aclSequence);
+ ObjectAcl::cssmGetOwner(owner);
+}
+
+void SecurityServerAcl::getAcl(const char *tag, uint32 &count, AclEntryInfo *&acls)
+{
+ StLock<Mutex> _(aclSequence);
+ ObjectAcl::cssmGetAcl(tag, count, acls);
+}
+
+void SecurityServerAcl::changeAcl(const AclEdit &edit, const AccessCredentials *cred,
+ Database *db)
+{
+ StLock<Mutex> _(aclSequence);
+ SecurityServerEnvironment env(*this, db);
+ ObjectAcl::cssmChangeAcl(edit, cred, &env);
+}
+
+void SecurityServerAcl::changeOwner(const AclOwnerPrototype &newOwner,
+ const AccessCredentials *cred, Database *db)
+{
+ StLock<Mutex> _(aclSequence);
+ SecurityServerEnvironment env(*this, db);
+ ObjectAcl::cssmChangeOwner(newOwner, cred, &env);
+}
+
+
+//
+// Modified validate() methods to connect all the conduits...
+//
+void SecurityServerAcl::validate(AclAuthorization auth, const AccessCredentials *cred, Database *db)
+{
+ SecurityServerEnvironment env(*this, db);
+
+ StLock<Mutex> objectSequence(aclSequence);
+ StLock<Mutex> processSequence(Server::process().aclSequence);
+ ObjectAcl::validate(auth, cred, &env);
+}
+
+void SecurityServerAcl::validate(AclAuthorization auth, const Context &context, Database *db)
+{
+ validate(auth,
+ context.get<AccessCredentials>(CSSM_ATTRIBUTE_ACCESS_CREDENTIALS), db);
+}
+
+
+//
+// This helper tries to add the (new) subject given to the ACL
+// whose validation is currently proceeding through context.
+// This will succeed if the ACL is in standard form, which means
+// a ThresholdAclSubject.
+// The new subject will be added at the front (so it is checked first
+// from now on), and as a side effect we'll notify the client side to
+// re-encode the object.
+// Returns true if the edit could be done, or false if the ACL wasn't
+// standard enough. May throw if the ACL is malformed or otherwise messed up.
+//
+// This is a self-contained helper that is here merely because it's "about"
+// ACLs and has no better home.
+//
+bool SecurityServerAcl::addToStandardACL(const AclValidationContext &context, AclSubject *subject)
+{
+ if (SecurityServerEnvironment *env = context.environment<SecurityServerEnvironment>())
+ if (ThresholdAclSubject *threshold = env->standardSubject(context)) {
+ unsigned size = threshold->count();
+ if (dynamic_cast<KeychainPromptAclSubject *>(threshold->subject(size-1))) {
+ // looks standard enough
+ secdebug("acl", "adding new subject %p to from of threshold ACL", subject);
+ threshold->add(subject, 0);
+
+ // tell the ACL it's been modified
+ context.acl()->changedAcl();
+
+ // trigger a special notification code on (otherwise successful) return
+ Server::connection().overrideReturn(CSSMERR_CSP_APPLE_ADD_APPLICATION_ACL_SUBJECT);
+ return true;
+ }
+ }
+ secdebug("acl", "ACL is not standard form; cannot edit");
+ return false;
+}
+
+
+//
+// Look at the ACL whose validation is currently proceeding through context.
+// If it LOOKS like a plausible version of a legacy "dot mac item" ACL.
+// We don't have access to the database attributes of the item up here in the
+// securityd sky, so we have to apply a heuristic based on which applications (by path)
+// are given access to the item.
+// So this is strictly a heuristic. The potential downside is that we may inadvertently
+// give access to new .Mac authorized Apple (only) applications when the user only intended
+// a limited set of extremely popular Apple (only) applications that just happen to all be
+// .Mac authorized today. We can live with that.
+//
+bool SecurityServerAcl::looksLikeLegacyDotMac(const AclValidationContext &context)
+{
+ static const char * const prototypicalDotMacPath[] = {
+ "/Applications/Mail.app",
+ "/Applications/Safari.app",
+ "/Applications/iSync.app",
+ "/Applications/System Preferences.app",
+ "/Applications/iCal.app",
+ "/Applications/iChat.app",
+ "/Applications/iTunes.app",
+ "/Applications/Address Book.app",
+ "/Applications/iSync.app",
+ NULL // sentinel
+ };
+
+ static const unsigned threshold = 6;
+
+ if (SecurityServerEnvironment *env = context.environment<SecurityServerEnvironment>()) {
+ if (ThresholdAclSubject *list = env->standardSubject(context)) {
+ unsigned count = list->count();
+ unsigned matches = 0;
+ for (unsigned n = 0; n < count; ++n) {
+ if (CodeSignatureAclSubject *app = dynamic_cast<CodeSignatureAclSubject *>(list->subject(n))) {
+ for (const char * const *p = prototypicalDotMacPath; *p; p++)
+ if (app->path() == *p)
+ matches++;
+ }
+ }
+ secdebug("codesign", "matched %d of %zd candididates (threshold=%d)",
+ matches, sizeof(prototypicalDotMacPath) / sizeof(char *) - 1, threshold);
+ return matches >= threshold;
+ }
+ }
+ return false;
+}
+
+
+//
+// External storage interface
+//
+Adornable &SecurityServerEnvironment::store(const AclSubject *subject)
+{
+ switch (subject->type()) {
+ case CSSM_ACL_SUBJECT_TYPE_PREAUTH:
+ {
+ if (TokenDatabase *tokenDb = dynamic_cast<TokenDatabase *>(database))
+ return tokenDb->common().store();
+ }
+ break;
+ default:
+ break;
+ }
+ CssmError::throwMe(CSSM_ERRCODE_ACL_SUBJECT_TYPE_NOT_SUPPORTED);
+}
+
+
+//
+// ProcessAclSubject personality: uid/gid/pid come from the active Process object
+//
+uid_t SecurityServerEnvironment::getuid() const
+{
+ return Server::process().uid();
+}
+
+gid_t SecurityServerEnvironment::getgid() const
+{
+ return Server::process().gid();
+}
+
+pid_t SecurityServerEnvironment::getpid() const
+{
+ return Server::process().pid();
+}
+
+
+//
+// CodeSignatureAclSubject personality: take code signature from active Process object
+//
+bool SecurityServerEnvironment::verifyCodeSignature(const OSXVerifier &verifier,
+ const AclValidationContext &context)
+{
+ return Server::codeSignatures().verify(Server::process(), verifier, context);
+}
+
+
+//
+// PromptedAclSubject personality: Get a secret by prompting through SecurityAgent
+//
+bool SecurityServerEnvironment::getSecret(CssmOwnedData &secret, const CssmData &prompt) const
+{
+ //@@@ ignoring prompt - not used right now
+ if (database) {
+ QueryPIN query(*database);
+ query.inferHints(Server::process());
+ if (!query()) { // success
+ secret = query.pin();
+ return true;
+ }
+ }
+ return false;
+}
+
+
+//
+// SecretAclSubject personality: externally validate a secret (passphrase etc.)
+// Right now, this always goes to the (Token)Database object, because that's where
+// the PIN ACL entries are. We could direct this at the ObjectAcl (database or key)
+// instead and rely on tokend to perform the PIN mapping, but the generic tokend
+// wrappers do not (currently) perform any ACL validation, so every tokend would have
+// to re-implement that. Perhaps in the next ACL revamp cycle...
+//
+bool SecurityServerEnvironment::validateSecret(const SecretAclSubject *me,
+ const AccessCredentials *cred)
+{
+ return database && database->validateSecret(me, cred);
+}
+
+
+//
+// PreAuthenticationAclSubject personality - refer to database (ObjectAcl)
+//
+ObjectAcl *SecurityServerEnvironment::preAuthSource()
+{
+ return database ? &database->acl() : NULL;
+}
+
+
+//
+// Autonomous ACL editing support
+//
+ThresholdAclSubject *SecurityServerEnvironment::standardSubject(const AclValidationContext &context)
+{
+ return dynamic_cast<ThresholdAclSubject *>(context.subject());
+}
+
+
+//
+// The default AclSource denies having an ACL at all
+//
+AclSource::~AclSource()
+{ /* virtual */ }
+
+SecurityServerAcl &AclSource::acl()
+{
+ CssmError::throwMe(CSSM_ERRCODE_OBJECT_ACL_NOT_SUPPORTED);
+}
+
+Database *AclSource::relatedDatabase()
+{
+ return NULL;
+}
projects / apple / security.git / blobdiff