// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/load_policy.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include "common.h"
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#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
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/*
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* Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
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*/
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static const char *tomoyo_loader;
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/**
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* tomoyo_loader_setup - Set policy loader.
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*
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* @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
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*
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* Returns 0.
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*/
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static int __init tomoyo_loader_setup(char *str)
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{
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tomoyo_loader = str;
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return 1;
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}
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__setup("TOMOYO_loader=", tomoyo_loader_setup);
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/**
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* tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
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*
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* Returns true if /sbin/tomoyo-init exists, false otherwise.
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*/
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static bool tomoyo_policy_loader_exists(void)
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{
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struct path path;
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if (!tomoyo_loader)
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tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
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if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
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pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
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tomoyo_loader);
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return false;
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}
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path_put(&path);
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return true;
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}
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/*
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* Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
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*/
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static const char *tomoyo_trigger;
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/**
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* tomoyo_trigger_setup - Set trigger for activation.
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*
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* @str: Program to use as an activation trigger (e.g. /sbin/init ).
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*
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* Returns 0.
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*/
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static int __init tomoyo_trigger_setup(char *str)
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{
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tomoyo_trigger = str;
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return 1;
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}
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__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
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/**
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* tomoyo_load_policy - Run external policy loader to load policy.
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*
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* @filename: The program about to start.
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*
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* This function checks whether @filename is /sbin/init , and if so
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* invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
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* and then continues invocation of /sbin/init.
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* /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
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* writes to /sys/kernel/security/tomoyo/ interfaces.
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*
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* Returns nothing.
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*/
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void tomoyo_load_policy(const char *filename)
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{
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static bool done;
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char *argv[2];
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char *envp[3];
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if (tomoyo_policy_loaded || done)
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return;
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if (!tomoyo_trigger)
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tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
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if (strcmp(filename, tomoyo_trigger))
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return;
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if (!tomoyo_policy_loader_exists())
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return;
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done = true;
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pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
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argv[0] = (char *) tomoyo_loader;
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argv[1] = NULL;
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envp[0] = "HOME=/";
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envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
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envp[2] = NULL;
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call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
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tomoyo_check_profile();
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}
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#endif
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