xnu-3247.1.106.tar.gz

[apple/xnu.git] / security / mac_mach.c

diff --git a/security/mac_mach.c b/security/mac_mach.c
new file mode 100644 (file)
index 0000000..4ff8cf7
--- /dev/null
+++ b/security/mac_mach.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_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. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * 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_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#include <mach/exception_types.h>
+#include <mach/mach_types.h>
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
+#include <kern/task.h>
+
+#include <security/mac_framework.h>
+#include <security/mac_internal.h>
+#include <security/mac_mach_internal.h>
+
+static struct proc *
+mac_task_get_proc(struct task *task)
+{
+       if (task == current_task())
+               return proc_self();
+
+       /*
+        * Tasks don't really hold a reference on a proc unless the
+        * calling thread belongs to the task in question.
+        */
+       int pid = task_pid(task);
+       struct proc *p = proc_find(pid);
+
+       if (p != NULL) {
+               if (proc_task(p) == task)
+                       return p;
+               proc_rele(p);
+       }
+       return NULL;
+}
+
+int
+mac_task_check_expose_task(struct task *task)
+{
+       int error;
+
+       struct proc *p = mac_task_get_proc(task);
+       if (p == NULL)
+               return ESRCH;
+
+       struct ucred *cred = kauth_cred_get();
+       MAC_CHECK(proc_check_expose_task, cred, p);
+       proc_rele(p);
+       return (error);
+}
+
+int
+mac_task_check_set_host_special_port(struct task *task, int id, struct ipc_port *port)
+{
+       int error;
+
+       struct proc *p = mac_task_get_proc(task);
+       if (p == NULL)
+               return ESRCH;
+
+       kauth_cred_t cred = kauth_cred_proc_ref(p);
+       MAC_CHECK(proc_check_set_host_special_port, cred, id, port);
+       kauth_cred_unref(&cred);
+       proc_rele(p);
+       return (error);
+}
+
+int
+mac_task_check_set_host_exception_port(struct task *task, unsigned int exception)
+{
+       int error;
+
+       struct proc *p = mac_task_get_proc(task);
+       if (p == NULL)
+               return ESRCH;
+
+       kauth_cred_t cred = kauth_cred_proc_ref(p);
+       MAC_CHECK(proc_check_set_host_exception_port, cred, exception);
+       kauth_cred_unref(&cred);
+       proc_rele(p);
+       return (error);
+}
+
+int
+mac_task_check_set_host_exception_ports(struct task *task, unsigned int exception_mask)
+{
+       int error = 0;
+       int exception;
+
+       struct proc *p = mac_task_get_proc(task);
+       if (p == NULL)
+               return ESRCH;
+
+       kauth_cred_t cred = kauth_cred_proc_ref(p);
+       for (exception = FIRST_EXCEPTION; exception < EXC_TYPES_COUNT; exception++) {
+               if (exception_mask & (1 << exception)) {
+                       MAC_CHECK(proc_check_set_host_exception_port, cred, exception);
+                       if (error)
+                               break;
+               }
+       }
+       kauth_cred_unref(&cred);
+       proc_rele(p);
+       return (error);
+}
+
+void
+mac_thread_userret(struct thread *td)
+{
+
+       MAC_PERFORM(thread_userret, td);
+}
+