Security-58286.1.32.tar.gz

[apple/security.git] / OSX / sec / ipc / server_security_helpers.c

diff --git a/OSX/sec/ipc/server_security_helpers.c b/OSX/sec/ipc/server_security_helpers.c
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+/*
+ * Copyright (c) 2017 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@
+ */
+
+#include <pthread/pthread.h>
+
+#include "server_security_helpers.h"
+#include "server_entitlement_helpers.h"
+
+#include <Security/SecTask.h>
+#include <Security/SecTaskPriv.h>
+#include <ipc/securityd_client.h>
+#include <Security/SecEntitlements.h>
+#include <Security/SecItem.h>
+#include <utilities/SecCFRelease.h>
+#include <utilities/SecCFWrappers.h>
+#include <utilities/debugging.h>
+#include <securityd/SecDbQuery.h>
+
+#if __has_include(<MobileKeyBag/MobileKeyBag.h>) && TARGET_HAS_KEYSTORE
+#include <MobileKeyBag/MobileKeyBag.h>
+#define HAVE_MOBILE_KEYBAG_SUPPORT 1
+#endif
+
+#if HAVE_MOBILE_KEYBAG_SUPPORT && TARGET_OS_EMBEDDED
+static bool
+device_is_multiuser(void)
+{
+    static dispatch_once_t once;
+    static bool result;
+
+    dispatch_once(&once, ^{
+        CFDictionaryRef deviceMode = MKBUserTypeDeviceMode(NULL, NULL);
+        CFTypeRef value = NULL;
+
+        if (deviceMode && CFDictionaryGetValueIfPresent(deviceMode, kMKBDeviceModeKey, &value) && CFEqual(value, kMKBDeviceModeMultiUser)) {
+            result = true;
+        }
+        CFReleaseNull(deviceMode);
+    });
+
+    return result;
+}
+#endif /* HAVE_MOBILE_KEYBAG_SUPPORT && TARGET_OS_EMBEDDED */
+
+void fill_security_client(SecurityClient * client, const uid_t uid, audit_token_t auditToken) {
+    if(!client) {
+        return;
+    }
+
+    client->uid = uid;
+
+#if HAVE_MOBILE_KEYBAG_SUPPORT && TARGET_OS_EMBEDDED
+
+    if (device_is_multiuser()) {
+        CFErrorRef error = NULL;
+
+        client->inMultiUser = true;
+        client->activeUser = MKBForegroundUserSessionID(&error);
+        if (client->activeUser == -1 || client->activeUser == 0) {
+            assert(0);
+            client->activeUser = 0;
+        }
+
+        /*
+         * If we are a edu mode user, and its not the active user,
+         * then the request is coming from inside the syncbubble.
+         *
+         * otherwise we are going to execute the request as the
+         * active user.
+         */
+
+        if (client->uid > 501 && (uid_t)client->activeUser != client->uid) {
+            secinfo("serverxpc", "securityd client: sync bubble user");
+            client->musr = SecMUSRCreateSyncBubbleUserUUID(client->uid);
+            client->keybag = KEYBAG_DEVICE;
+        } else {
+            secinfo("serverxpc", "securityd client: active user");
+            client->musr = SecMUSRCreateActiveUserUUID(client->activeUser);
+            client->uid = (uid_t)client->activeUser;
+            client->keybag = KEYBAG_DEVICE;
+        }
+    }
+#endif
+
+    client->task = SecTaskCreateWithAuditToken(kCFAllocatorDefault, auditToken);
+
+#if TARGET_OS_IPHONE
+    pthread_setspecific(taskThreadKey, client->task);
+#endif
+
+    client->accessGroups = SecTaskCopyAccessGroups(client->task);
+
+#if TARGET_OS_IPHONE
+    client->allowSystemKeychain = SecTaskGetBooleanValueForEntitlement(client->task, kSecEntitlementPrivateSystemKeychain);
+    client->isNetworkExtension = SecTaskGetBooleanValueForEntitlement(client->task, kSecEntitlementPrivateNetworkExtension);
+    client->canAccessNetworkExtensionAccessGroups = SecTaskGetBooleanValueForEntitlement(client->task, kSecEntitlementNetworkExtensionAccessGroups);
+#endif
+#if HAVE_MOBILE_KEYBAG_SUPPORT && TARGET_OS_EMBEDDED
+    if (client->inMultiUser) {
+        client->allowSyncBubbleKeychain = SecTaskGetBooleanValueForEntitlement(client->task, kSecEntitlementPrivateKeychainSyncBubble);
+    }
+#endif
+}
+