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