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660 lines
17 KiB
C
660 lines
17 KiB
C
/**
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* BSD Secure Levels LSM
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*
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* Maintainers:
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* Michael A. Halcrow <mike@halcrow.us>
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* Serge Hallyn <hallyn@cs.wm.edu>
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*
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* Copyright (c) 2001 WireX Communications, Inc <chris@wirex.com>
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* Copyright (c) 2001 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2002 International Business Machines <robb@austin.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/security.h>
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#include <linux/netlink.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/capability.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/kobject.h>
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#include <linux/crypto.h>
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#include <asm/scatterlist.h>
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#include <linux/gfp.h>
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#include <linux/sysfs.h>
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#define SHA1_DIGEST_SIZE 20
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/**
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* Module parameter that defines the initial secure level.
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*
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* When built as a module, it defaults to seclvl 1, which is the
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* behavior of BSD secure levels. Note that this default behavior
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* wrecks havoc on a machine when the seclvl module is compiled into
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* the kernel. In that case, we default to seclvl 0.
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*/
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#ifdef CONFIG_SECURITY_SECLVL_MODULE
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static int initlvl = 1;
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#else
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static int initlvl;
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#endif
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module_param(initlvl, int, 0);
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MODULE_PARM_DESC(initlvl, "Initial secure level (defaults to 1)");
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/* Module parameter that defines the verbosity level */
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static int verbosity;
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module_param(verbosity, int, 0);
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MODULE_PARM_DESC(verbosity, "Initial verbosity level (0 or 1; defaults to "
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"0, which is Quiet)");
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/**
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* Optional password which can be passed in to bring seclvl to 0
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* (i.e., for halt/reboot). Defaults to NULL (the passwd attribute
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* file will not be registered in sysfs).
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*
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* This gets converted to its SHA1 hash when stored. It's probably
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* not a good idea to use this parameter when loading seclvl from a
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* script; use sha1_passwd instead.
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*/
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#define MAX_PASSWD_SIZE 32
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static char passwd[MAX_PASSWD_SIZE];
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module_param_string(passwd, passwd, sizeof(passwd), 0);
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MODULE_PARM_DESC(passwd,
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"Plaintext of password that sets seclvl=0 when written to "
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"(sysfs mount point)/seclvl/passwd\n");
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/**
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* SHA1 hashed version of the optional password which can be passed in
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* to bring seclvl to 0 (i.e., for halt/reboot). Must be in
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* hexadecimal format (40 characters). Defaults to NULL (the passwd
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* attribute file will not be registered in sysfs).
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*
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* Use the sha1sum utility to generate the SHA1 hash of a password:
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*
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* echo -n "secret" | sha1sum
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*/
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#define MAX_SHA1_PASSWD 41
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static char sha1_passwd[MAX_SHA1_PASSWD];
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module_param_string(sha1_passwd, sha1_passwd, sizeof(sha1_passwd), 0);
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MODULE_PARM_DESC(sha1_passwd,
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"SHA1 hash (40 hexadecimal characters) of password that "
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"sets seclvl=0 when plaintext password is written to "
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"(sysfs mount point)/seclvl/passwd\n");
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static int hideHash = 1;
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module_param(hideHash, int, 0);
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MODULE_PARM_DESC(hideHash, "When set to 0, reading seclvl/passwd from sysfs "
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"will return the SHA1-hashed value of the password that "
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"lowers the secure level to 0.\n");
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#define MY_NAME "seclvl"
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/**
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* This time-limits log writes to one per second.
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*/
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#define seclvl_printk(verb, type, fmt, arg...) \
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do { \
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if (verbosity >= verb) { \
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static unsigned long _prior; \
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unsigned long _now = jiffies; \
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if ((_now - _prior) > HZ) { \
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printk(type "%s: %s: " fmt, \
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MY_NAME, __FUNCTION__ , \
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## arg); \
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_prior = _now; \
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} \
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} \
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} while (0)
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/**
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* The actual security level. Ranges between -1 and 2 inclusive.
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*/
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static int seclvl;
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/**
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* flag to keep track of how we were registered
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*/
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static int secondary;
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/**
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* Verifies that the requested secure level is valid, given the current
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* secure level.
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*/
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static int seclvl_sanity(int reqlvl)
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{
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if ((reqlvl < -1) || (reqlvl > 2)) {
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seclvl_printk(1, KERN_WARNING, "Attempt to set seclvl out of "
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"range: [%d]\n", reqlvl);
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return -EINVAL;
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}
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if ((seclvl == 0) && (reqlvl == -1))
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return 0;
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if (reqlvl < seclvl) {
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seclvl_printk(1, KERN_WARNING, "Attempt to lower seclvl to "
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"[%d]\n", reqlvl);
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return -EPERM;
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}
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return 0;
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}
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/**
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* security level advancement rules:
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* Valid levels are -1 through 2, inclusive.
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* From -1, stuck. [ in case compiled into kernel ]
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* From 0 or above, can only increment.
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*/
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static void do_seclvl_advance(void *data, u64 val)
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{
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int ret;
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int newlvl = (int)val;
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ret = seclvl_sanity(newlvl);
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if (ret)
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return;
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if (newlvl > 2) {
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seclvl_printk(1, KERN_WARNING, "Cannot advance to seclvl "
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"[%d]\n", newlvl);
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return;
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}
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if (seclvl == -1) {
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seclvl_printk(1, KERN_WARNING, "Not allowed to advance to "
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"seclvl [%d]\n", seclvl);
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return;
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}
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seclvl = newlvl; /* would it be more "correct" to set *data? */
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return;
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}
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static u64 seclvl_int_get(void *data)
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{
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return *(int *)data;
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}
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DEFINE_SIMPLE_ATTRIBUTE(seclvl_file_ops, seclvl_int_get, do_seclvl_advance, "%lld\n");
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static unsigned char hashedPassword[SHA1_DIGEST_SIZE];
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/**
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* Converts a block of plaintext of into its SHA1 hashed value.
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*
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* It would be nice if crypto had a wrapper to do this for us linear
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* people...
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*/
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static int
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plaintext_to_sha1(unsigned char *hash, const char *plaintext, int len)
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{
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char *pgVirtAddr;
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struct crypto_tfm *tfm;
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struct scatterlist sg[1];
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if (len > PAGE_SIZE) {
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seclvl_printk(0, KERN_ERR, "Plaintext password too large (%d "
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"characters). Largest possible is %lu "
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"bytes.\n", len, PAGE_SIZE);
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return -ENOMEM;
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}
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tfm = crypto_alloc_tfm("sha1", CRYPTO_TFM_REQ_MAY_SLEEP);
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if (tfm == NULL) {
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seclvl_printk(0, KERN_ERR,
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"Failed to load transform for SHA1\n");
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return -ENOSYS;
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}
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// Just get a new page; don't play around with page boundaries
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// and scatterlists.
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pgVirtAddr = (char *)__get_free_page(GFP_KERNEL);
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sg[0].page = virt_to_page(pgVirtAddr);
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sg[0].offset = 0;
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sg[0].length = len;
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strncpy(pgVirtAddr, plaintext, len);
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crypto_digest_init(tfm);
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crypto_digest_update(tfm, sg, 1);
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crypto_digest_final(tfm, hash);
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crypto_free_tfm(tfm);
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free_page((unsigned long)pgVirtAddr);
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return 0;
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}
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/**
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* Called whenever the user writes to the sysfs passwd handle to this kernel
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* object. It hashes the password and compares the hashed results.
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*/
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static ssize_t
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passwd_write_file(struct file * file, const char __user * buf,
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size_t count, loff_t *ppos)
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{
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int i;
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unsigned char tmp[SHA1_DIGEST_SIZE];
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char *page;
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int rc;
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int len;
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if (!*passwd && !*sha1_passwd) {
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seclvl_printk(0, KERN_ERR, "Attempt to password-unlock the "
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"seclvl module, but neither a plain text "
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"password nor a SHA1 hashed password was "
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"passed in as a module parameter! This is a "
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"bug, since it should not be possible to be in "
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"this part of the module; please tell a "
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"maintainer about this event.\n");
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return -EINVAL;
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}
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if (count < 0 || count >= PAGE_SIZE)
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return -ENOMEM;
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if (*ppos != 0) {
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return -EINVAL;
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}
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page = (char *)get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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len = -EFAULT;
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if (copy_from_user(page, buf, count))
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goto out;
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len = strlen(page);
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/* ``echo "secret" > seclvl/passwd'' includes a newline */
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if (page[len - 1] == '\n') {
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len--;
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}
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/* Hash the password, then compare the hashed values */
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if ((rc = plaintext_to_sha1(tmp, page, len))) {
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seclvl_printk(0, KERN_ERR, "Error hashing password: rc = "
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"[%d]\n", rc);
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return rc;
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}
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for (i = 0; i < SHA1_DIGEST_SIZE; i++) {
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if (hashedPassword[i] != tmp[i]) {
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return -EPERM;
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}
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}
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seclvl_printk(0, KERN_INFO,
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"Password accepted; seclvl reduced to 0.\n");
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seclvl = 0;
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len = count;
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out:
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free_page((unsigned long)page);
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return len;
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}
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static struct file_operations passwd_file_ops = {
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.write = passwd_write_file,
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};
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/**
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* Explicitely disallow ptrace'ing the init process.
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*/
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static int seclvl_ptrace(struct task_struct *parent, struct task_struct *child)
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{
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if (seclvl >= 0) {
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if (child->pid == 1) {
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seclvl_printk(1, KERN_WARNING, "Attempt to ptrace "
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"the init process dissallowed in "
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"secure level %d\n", seclvl);
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return -EPERM;
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}
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}
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return 0;
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}
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/**
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* Capability checks for seclvl. The majority of the policy
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* enforcement for seclvl takes place here.
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*/
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static int seclvl_capable(struct task_struct *tsk, int cap)
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{
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/* init can do anything it wants */
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if (tsk->pid == 1)
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return 0;
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switch (seclvl) {
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case 2:
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/* fall through */
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case 1:
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if (cap == CAP_LINUX_IMMUTABLE) {
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seclvl_printk(1, KERN_WARNING, "Attempt to modify "
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"the IMMUTABLE and/or APPEND extended "
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"attribute on a file with the IMMUTABLE "
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"and/or APPEND extended attribute set "
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"denied in seclvl [%d]\n", seclvl);
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return -EPERM;
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} else if (cap == CAP_SYS_RAWIO) { // Somewhat broad...
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seclvl_printk(1, KERN_WARNING, "Attempt to perform "
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"raw I/O while in secure level [%d] "
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"denied\n", seclvl);
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return -EPERM;
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} else if (cap == CAP_NET_ADMIN) {
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seclvl_printk(1, KERN_WARNING, "Attempt to perform "
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"network administrative task while "
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"in secure level [%d] denied\n", seclvl);
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return -EPERM;
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} else if (cap == CAP_SETUID) {
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seclvl_printk(1, KERN_WARNING, "Attempt to setuid "
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"while in secure level [%d] denied\n",
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seclvl);
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return -EPERM;
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} else if (cap == CAP_SETGID) {
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seclvl_printk(1, KERN_WARNING, "Attempt to setgid "
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"while in secure level [%d] denied\n",
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seclvl);
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} else if (cap == CAP_SYS_MODULE) {
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seclvl_printk(1, KERN_WARNING, "Attempt to perform "
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"a module operation while in secure "
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"level [%d] denied\n", seclvl);
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return -EPERM;
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}
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break;
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default:
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break;
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}
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/* from dummy.c */
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if (cap_is_fs_cap(cap) ? tsk->fsuid == 0 : tsk->euid == 0)
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return 0; /* capability granted */
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seclvl_printk(1, KERN_WARNING, "Capability denied\n");
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return -EPERM; /* capability denied */
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}
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/**
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* Disallow reversing the clock in seclvl > 1
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*/
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static int seclvl_settime(struct timespec *tv, struct timezone *tz)
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{
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struct timespec now;
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if (seclvl > 1) {
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now = current_kernel_time();
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if (tv->tv_sec < now.tv_sec ||
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(tv->tv_sec == now.tv_sec && tv->tv_nsec < now.tv_nsec)) {
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seclvl_printk(1, KERN_WARNING, "Attempt to decrement "
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"time in secure level %d denied: "
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"current->pid = [%d], "
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"current->group_leader->pid = [%d]\n",
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seclvl, current->pid,
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current->group_leader->pid);
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return -EPERM;
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} /* if attempt to decrement time */
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} /* if seclvl > 1 */
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return 0;
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}
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/* claim the blockdev to exclude mounters, release on file close */
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static int seclvl_bd_claim(struct inode *inode)
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{
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int holder;
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struct block_device *bdev = NULL;
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dev_t dev = inode->i_rdev;
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bdev = open_by_devnum(dev, FMODE_WRITE);
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if (bdev) {
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if (bd_claim(bdev, &holder)) {
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blkdev_put(bdev);
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return -EPERM;
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}
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/* claimed, mark it to release on close */
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inode->i_security = current;
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}
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return 0;
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}
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/* release the blockdev if you claimed it */
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static void seclvl_bd_release(struct inode *inode)
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{
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if (inode && S_ISBLK(inode->i_mode) && inode->i_security == current) {
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struct block_device *bdev = inode->i_bdev;
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if (bdev) {
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bd_release(bdev);
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blkdev_put(bdev);
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inode->i_security = NULL;
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}
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}
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}
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/**
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* Security for writes to block devices is regulated by this seclvl
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* function. Deny all writes to block devices in seclvl 2. In
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* seclvl 1, we only deny writes to *mounted* block devices.
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*/
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static int
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seclvl_inode_permission(struct inode *inode, int mask, struct nameidata *nd)
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{
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if (current->pid != 1 && S_ISBLK(inode->i_mode) && (mask & MAY_WRITE)) {
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switch (seclvl) {
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case 2:
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seclvl_printk(1, KERN_WARNING, "Write to block device "
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"denied in secure level [%d]\n", seclvl);
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return -EPERM;
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case 1:
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if (seclvl_bd_claim(inode)) {
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seclvl_printk(1, KERN_WARNING,
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"Write to mounted block device "
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"denied in secure level [%d]\n",
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seclvl);
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return -EPERM;
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}
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}
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}
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return 0;
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}
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/**
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* The SUID and SGID bits cannot be set in seclvl >= 1
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*/
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static int seclvl_inode_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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if (seclvl > 0) {
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if (iattr->ia_valid & ATTR_MODE)
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if (iattr->ia_mode & S_ISUID ||
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iattr->ia_mode & S_ISGID) {
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seclvl_printk(1, KERN_WARNING, "Attempt to "
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"modify SUID or SGID bit "
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"denied in seclvl [%d]\n",
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seclvl);
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return -EPERM;
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}
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}
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return 0;
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}
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/* release busied block devices */
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static void seclvl_file_free_security(struct file *filp)
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{
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struct dentry *dentry = filp->f_dentry;
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struct inode *inode = NULL;
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if (dentry) {
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inode = dentry->d_inode;
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seclvl_bd_release(inode);
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}
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}
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/**
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* Cannot unmount in secure level 2
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*/
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static int seclvl_umount(struct vfsmount *mnt, int flags)
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{
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if (current->pid == 1) {
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return 0;
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}
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if (seclvl == 2) {
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seclvl_printk(1, KERN_WARNING, "Attempt to unmount in secure "
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"level %d\n", seclvl);
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return -EPERM;
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}
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return 0;
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}
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static struct security_operations seclvl_ops = {
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.ptrace = seclvl_ptrace,
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.capable = seclvl_capable,
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.inode_permission = seclvl_inode_permission,
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.inode_setattr = seclvl_inode_setattr,
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.file_free_security = seclvl_file_free_security,
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|
.settime = seclvl_settime,
|
|
.sb_umount = seclvl_umount,
|
|
};
|
|
|
|
/**
|
|
* Process the password-related module parameters
|
|
*/
|
|
static int processPassword(void)
|
|
{
|
|
int rc = 0;
|
|
hashedPassword[0] = '\0';
|
|
if (*passwd) {
|
|
if (*sha1_passwd) {
|
|
seclvl_printk(0, KERN_ERR, "Error: Both "
|
|
"passwd and sha1_passwd "
|
|
"were set, but they are mutually "
|
|
"exclusive.\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((rc = plaintext_to_sha1(hashedPassword, passwd,
|
|
strlen(passwd)))) {
|
|
seclvl_printk(0, KERN_ERR, "Error: SHA1 support not "
|
|
"in kernel\n");
|
|
return rc;
|
|
}
|
|
/* All static data goes to the BSS, which zero's the
|
|
* plaintext password out for us. */
|
|
} else if (*sha1_passwd) { // Base 16
|
|
int i;
|
|
i = strlen(sha1_passwd);
|
|
if (i != (SHA1_DIGEST_SIZE * 2)) {
|
|
seclvl_printk(0, KERN_ERR, "Received [%d] bytes; "
|
|
"expected [%d] for the hexadecimal "
|
|
"representation of the SHA1 hash of "
|
|
"the password.\n",
|
|
i, (SHA1_DIGEST_SIZE * 2));
|
|
return -EINVAL;
|
|
}
|
|
while ((i -= 2) + 2) {
|
|
unsigned char tmp;
|
|
tmp = sha1_passwd[i + 2];
|
|
sha1_passwd[i + 2] = '\0';
|
|
hashedPassword[i / 2] = (unsigned char)
|
|
simple_strtol(&sha1_passwd[i], NULL, 16);
|
|
sha1_passwd[i + 2] = tmp;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* securityfs registrations
|
|
*/
|
|
struct dentry *dir_ino, *seclvl_ino, *passwd_ino;
|
|
|
|
static int seclvlfs_register(void)
|
|
{
|
|
dir_ino = securityfs_create_dir("seclvl", NULL);
|
|
if (!dir_ino)
|
|
return -EFAULT;
|
|
|
|
seclvl_ino = securityfs_create_file("seclvl", S_IRUGO | S_IWUSR,
|
|
dir_ino, &seclvl, &seclvl_file_ops);
|
|
if (!seclvl_ino)
|
|
goto out_deldir;
|
|
if (*passwd || *sha1_passwd) {
|
|
passwd_ino = securityfs_create_file("passwd", S_IRUGO | S_IWUSR,
|
|
dir_ino, NULL, &passwd_file_ops);
|
|
if (!passwd_ino)
|
|
goto out_delf;
|
|
}
|
|
return 0;
|
|
|
|
out_deldir:
|
|
securityfs_remove(dir_ino);
|
|
out_delf:
|
|
securityfs_remove(seclvl_ino);
|
|
|
|
return -EFAULT;
|
|
}
|
|
|
|
/**
|
|
* Initialize the seclvl module.
|
|
*/
|
|
static int __init seclvl_init(void)
|
|
{
|
|
int rc = 0;
|
|
if (verbosity < 0 || verbosity > 1) {
|
|
printk(KERN_ERR "Error: bad verbosity [%d]; only 0 or 1 "
|
|
"are valid values\n", verbosity);
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
if (initlvl < -1 || initlvl > 2) {
|
|
seclvl_printk(0, KERN_ERR, "Error: bad initial securelevel "
|
|
"[%d].\n", initlvl);
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
seclvl = initlvl;
|
|
if ((rc = processPassword())) {
|
|
seclvl_printk(0, KERN_ERR, "Error processing the password "
|
|
"module parameter(s): rc = [%d]\n", rc);
|
|
goto exit;
|
|
}
|
|
/* register ourselves with the security framework */
|
|
if (register_security(&seclvl_ops)) {
|
|
seclvl_printk(0, KERN_ERR,
|
|
"seclvl: Failure registering with the "
|
|
"kernel.\n");
|
|
/* try registering with primary module */
|
|
rc = mod_reg_security(MY_NAME, &seclvl_ops);
|
|
if (rc) {
|
|
seclvl_printk(0, KERN_ERR, "seclvl: Failure "
|
|
"registering with primary security "
|
|
"module.\n");
|
|
goto exit;
|
|
} /* if primary module registered */
|
|
secondary = 1;
|
|
} /* if we registered ourselves with the security framework */
|
|
if ((rc = seclvlfs_register())) {
|
|
seclvl_printk(0, KERN_ERR, "Error registering with sysfs\n");
|
|
goto exit;
|
|
}
|
|
seclvl_printk(0, KERN_INFO, "seclvl: Successfully initialized.\n");
|
|
exit:
|
|
if (rc) {
|
|
printk(KERN_ERR "seclvl: Error during initialization: rc = "
|
|
"[%d]\n", rc);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Remove the seclvl module.
|
|
*/
|
|
static void __exit seclvl_exit(void)
|
|
{
|
|
securityfs_remove(seclvl_ino);
|
|
if (*passwd || *sha1_passwd) {
|
|
securityfs_remove(passwd_ino);
|
|
}
|
|
securityfs_remove(dir_ino);
|
|
if (secondary == 1) {
|
|
mod_unreg_security(MY_NAME, &seclvl_ops);
|
|
} else if (unregister_security(&seclvl_ops)) {
|
|
seclvl_printk(0, KERN_INFO,
|
|
"seclvl: Failure unregistering with the "
|
|
"kernel\n");
|
|
}
|
|
}
|
|
|
|
module_init(seclvl_init);
|
|
module_exit(seclvl_exit);
|
|
|
|
MODULE_AUTHOR("Michael A. Halcrow <mike@halcrow.us>");
|
|
MODULE_DESCRIPTION("LSM implementation of the BSD Secure Levels");
|
|
MODULE_LICENSE("GPL");
|