82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* security/tomoyo/load_policy.c
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*
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* Policy loader launcher for TOMOYO.
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*
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* Copyright (C) 2005-2010 NTT DATA CORPORATION
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*/
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#include "common.h"
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/* path to policy loader */
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static const char *tomoyo_loader = "/sbin/tomoyo-init";
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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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/*
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* Don't activate MAC if the policy loader doesn't exist.
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* If the initrd includes /sbin/init but real-root-dev has not
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* mounted on / yet, activating MAC will block the system since
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* policies are not loaded yet.
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* Thus, let do_execve() call this function everytime.
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*/
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struct path path;
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if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
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printk(KERN_INFO "Not activating Mandatory Access Control now "
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"since %s doesn't exist.\n", 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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* 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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char *argv[2];
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char *envp[3];
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if (tomoyo_policy_loaded)
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return;
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/*
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* Check filename is /sbin/init or /sbin/tomoyo-start.
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* /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
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* be passed.
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* You can create /sbin/tomoyo-start by
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* "ln -s /bin/true /sbin/tomoyo-start".
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*/
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if (strcmp(filename, "/sbin/init") &&
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strcmp(filename, "/sbin/tomoyo-start"))
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return;
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if (!tomoyo_policy_loader_exists())
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return;
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printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
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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, 1);
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tomoyo_check_profile();
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}
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