115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor ipc mediation
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2010 Canonical Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/ptrace.h>
|
|
|
|
#include "include/audit.h"
|
|
#include "include/capability.h"
|
|
#include "include/context.h"
|
|
#include "include/policy.h"
|
|
|
|
/* call back to audit ptrace fields */
|
|
static void audit_cb(struct audit_buffer *ab, void *va)
|
|
{
|
|
struct common_audit_data *sa = va;
|
|
audit_log_format(ab, " target=");
|
|
audit_log_untrustedstring(ab, sa->aad.target);
|
|
}
|
|
|
|
/**
|
|
* aa_audit_ptrace - do auditing for ptrace
|
|
* @profile: profile being enforced (NOT NULL)
|
|
* @target: profile being traced (NOT NULL)
|
|
* @error: error condition
|
|
*
|
|
* Returns: %0 or error code
|
|
*/
|
|
static int aa_audit_ptrace(struct aa_profile *profile,
|
|
struct aa_profile *target, int error)
|
|
{
|
|
struct common_audit_data sa;
|
|
COMMON_AUDIT_DATA_INIT(&sa, NONE);
|
|
sa.aad.op = OP_PTRACE;
|
|
sa.aad.target = target;
|
|
sa.aad.error = error;
|
|
|
|
return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_ATOMIC, &sa,
|
|
audit_cb);
|
|
}
|
|
|
|
/**
|
|
* aa_may_ptrace - test if tracer task can trace the tracee
|
|
* @tracer_task: task who will do the tracing (NOT NULL)
|
|
* @tracer: profile of the task doing the tracing (NOT NULL)
|
|
* @tracee: task to be traced
|
|
* @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH
|
|
*
|
|
* Returns: %0 else error code if permission denied or error
|
|
*/
|
|
int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer,
|
|
struct aa_profile *tracee, unsigned int mode)
|
|
{
|
|
/* TODO: currently only based on capability, not extended ptrace
|
|
* rules,
|
|
* Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH
|
|
*/
|
|
|
|
if (unconfined(tracer) || tracer == tracee)
|
|
return 0;
|
|
/* log this capability request */
|
|
return aa_capable(tracer_task, tracer, CAP_SYS_PTRACE, 1);
|
|
}
|
|
|
|
/**
|
|
* aa_ptrace - do ptrace permission check and auditing
|
|
* @tracer: task doing the tracing (NOT NULL)
|
|
* @tracee: task being traced (NOT NULL)
|
|
* @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH
|
|
*
|
|
* Returns: %0 else error code if permission denied or error
|
|
*/
|
|
int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,
|
|
unsigned int mode)
|
|
{
|
|
/*
|
|
* tracer can ptrace tracee when
|
|
* - tracer is unconfined ||
|
|
* - tracer is in complain mode
|
|
* - tracer has rules allowing it to trace tracee currently this is:
|
|
* - confined by the same profile ||
|
|
* - tracer profile has CAP_SYS_PTRACE
|
|
*/
|
|
|
|
struct aa_profile *tracer_p;
|
|
/* cred released below */
|
|
const struct cred *cred = get_task_cred(tracer);
|
|
int error = 0;
|
|
tracer_p = aa_cred_profile(cred);
|
|
|
|
if (!unconfined(tracer_p)) {
|
|
/* lcred released below */
|
|
const struct cred *lcred = get_task_cred(tracee);
|
|
struct aa_profile *tracee_p = aa_cred_profile(lcred);
|
|
|
|
error = aa_may_ptrace(tracer, tracer_p, tracee_p, mode);
|
|
error = aa_audit_ptrace(tracer_p, tracee_p, error);
|
|
|
|
put_cred(lcred);
|
|
}
|
|
put_cred(cred);
|
|
|
|
return error;
|
|
}
|