// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CIPSO - Commercial IP Security Option
*
* This is an implementation of the CIPSO 2.2 protocol as specified in
* draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
* FIPS-188. While CIPSO never became a full IETF RFC standard many vendors
* have chosen to adopt the protocol and over the years it has become a
* de-facto standard for labeled networking.
*
* The CIPSO draft specification can be found in the kernel's Documentation
* directory as well as the following URL:
* https://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt
* The FIPS-188 specification can be found at the following URL:
* https://www.itl.nist.gov/fipspubs/fip188.htm
*
* Author: Paul Moore <[email protected]>
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/jhash.h>
#include <linux/audit.h>
#include <linux/slab.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/unaligned.h>
/* List of available DOI definitions */
/* XXX - This currently assumes a minimal number of different DOIs in use,
* if in practice there are a lot of different DOIs this list should
* probably be turned into a hash table or something similar so we
* can do quick lookups. */
static DEFINE_SPINLOCK(cipso_v4_doi_list_lock);
static LIST_HEAD(cipso_v4_doi_list);
/* Label mapping cache */
int cipso_v4_cache_enabled = 1;
int cipso_v4_cache_bucketsize = 10;
#define CIPSO_V4_CACHE_BUCKETBITS 7
#define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS)
#define CIPSO_V4_CACHE_REORDERLIMIT 10
struct cipso_v4_map_cache_bkt {
spinlock_t lock;
u32 size;
struct list_head list;
};
struct cipso_v4_map_cache_entry {
u32 hash;
unsigned char *key;
size_t key_len;
struct netlbl_lsm_cache *lsm_data;
u32 activity;
struct list_head list;
};
static struct cipso_v4_map_cache_bkt *cipso_v4_cache;
/* Restricted bitmap (tag #1) flags */
int cipso_v4_rbm_optfmt;
int cipso_v4_rbm_strictvalid = 1;
/*
* Protocol Constants
*/
/* Maximum size of the CIPSO IP option, derived from the fact that the maximum
* IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */
#define CIPSO_V4_OPT_LEN_MAX 40
/* Length of the base CIPSO option, this includes the option type (1 byte), the
* option length (1 byte), and the DOI (4 bytes). */
#define CIPSO_V4_HDR_LEN 6
/* Base length of the restrictive category bitmap tag (tag #1). */
#define CIPSO_V4_TAG_RBM_BLEN 4
/* Base length of the enumerated category tag (tag #2). */
#define CIPSO_V4_TAG_ENUM_BLEN 4
/* Base length of the ranged categories bitmap tag (tag #5). */
#define CIPSO_V4_TAG_RNG_BLEN 4
/* The maximum number of category ranges permitted in the ranged category tag
* (tag #5). You may note that the IETF draft states that the maximum number
* of category ranges is 7, but if the low end of the last category range is
* zero then it is possible to fit 8 category ranges because the zero should
* be omitted. */
#define CIPSO_V4_TAG_RNG_CAT_MAX 8
/* Base length of the local tag (non-standard tag).
* Tag definition (may change between kernel versions)
*
* 0 8 16 24 32
* +----------+----------+----------+----------+
* | 10000000 | 00000110 | 32-bit secid value |
* +----------+----------+----------+----------+
* | in (host byte order)|
* +----------+----------+
*
*/
#define CIPSO_V4_TAG_LOC_BLEN 6
/*
* Helper Functions
*/
/**
* cipso_v4_cache_entry_free - Frees a cache entry
* @entry: the entry to free
*
* Description:
* This function frees the memory associated with a cache entry including the
* LSM cache data if there are no longer any users, i.e. reference count == 0.
*
*/
static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry)
{
if (entry->lsm_data)
netlbl_secattr_cache_free(entry->lsm_data);
kfree(entry->key);
kfree(entry);
}
/**
* cipso_v4_map_cache_hash - Hashing function for the CIPSO cache
* @key: the hash key
* @key_len: the length of the key in bytes
*
* Description:
* The CIPSO tag hashing function. Returns a 32-bit hash value.
*
*/
static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len)
{
return jhash(key, key_len, 0);
}
/*
* Label Mapping Cache Functions
*/
/**
* cipso_v4_cache_init - Initialize the CIPSO cache
*
* Description:
* Initializes the CIPSO label mapping cache, this function should be called
* before any of the other functions defined in this file. Returns zero on
* success, negative values on error.
*
*/
static int __init cipso_v4_cache_init(void)
{
u32 iter;
cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS,
sizeof(struct cipso_v4_map_cache_bkt),
GFP_KERNEL);
if (!cipso_v4_cache)
return -ENOMEM;
for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) {
spin_lock_init(&cipso_v4_cache[iter].lock);
cipso_v4_cache[iter].size = 0;
INIT_LIST_HEAD(&cipso_v4_cache[iter].list);
}
return 0;
}
/**
* cipso_v4_cache_invalidate - Invalidates the current CIPSO cache
*
* Description:
* Invalidates and frees any entries in the CIPSO cache.
*
*/
void cipso_v4_cache_invalidate(void)
{
struct cipso_v4_map_cache_entry *entry, *tmp_entry;
u32 iter;
for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) {
spin_lock_bh(&cipso_v4_cache[iter].lock);
list_for_each_entry_safe(entry,
tmp_entry,
&cipso_v4_cache[iter].list, list) {
list_del(&entry->list);
cipso_v4_cache_entry_free(entry);
}
cipso_v4_cache[iter].size = 0;
spin_unlock_bh(&cipso_v4_cache[iter].lock);
}
}
/**
* cipso_v4_cache_check - Check the CIPSO cache for a label mapping
* @key: the buffer to check
* @key_len: buffer length in bytes
* @secattr: the security attribute struct to use
*
* Description:
* This function checks the cache to see if a label mapping already exists for
* the given key. If there is a match then the cache is adjusted and the
* @secattr struct is populated with the correct LSM security attributes. The
* cache is adjusted in the following manner if the entry is not already the
* first in the cache bucket:
*
* 1. The cache entry's activity counter is incremented
* 2. The previous (higher ranking) entry's activity counter is decremented
* 3. If the difference between the two activity counters is geater than
* CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped
*
* Returns zero on success, -ENOENT for a cache miss, and other negative values
* on error.
*
*/
static int cipso_v4_cache_check(const unsigned char *key,
u32 key_len,
struct netlbl_lsm_secattr *secattr)
{
u32 bkt;
struct cipso_v4_map_cache_entry *entry;
struct cipso_v4_map_cache_entry *prev_entry = NULL;
u32 hash;
if (!READ_ONCE(cipso_v4_cache_enabled))
return -ENOENT;
hash = cipso_v4_map_cache_hash(key, key_len);
bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1);
spin_lock_bh(&cipso_v4_cache[bkt].lock);
list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) {
if (entry->hash == hash &&
entry->key_len == key_len &&
memcmp(entry->key, key, key_len) == 0) {
entry->activity += 1;
refcount_inc(&entry->lsm_data->refcount);
secattr->cache = entry->lsm_data;
secattr->flags |= NETLBL_SECATTR_CACHE;
secattr->type = NETLBL_NLTYPE_CIPSOV4;
if (!prev_entry) {
spin_unlock_bh(&cipso_v4_cache[bkt].lock);
return 0;
}
if (prev_entry->activity > 0)
prev_entry->activity -= 1;
if (entry->activity > prev_entry->activity &&
entry->activity - prev_entry->activity >
CIPSO_V4_CACHE_REORDERLIMIT) {
__list_del(entry->list.prev, entry->list.next);
__list_add(&entry->list,
prev_entry->list.prev,
&prev_entry->list);
}
spin_unlock_bh(&cipso_v4_cache[bkt].lock);
return 0;
}
prev_entry = entry;
}
spin_unlock_bh(&cipso_v4_cache[bkt].lock);
return -ENOENT;
}
/**
* cipso_v4_cache_add - Add an entry to the CIPSO cache
* @cipso_ptr: pointer to CIPSO IP option
* @secattr: the packet's security attributes
*
* Description:
* Add a new entry into the CIPSO label mapping cache. Add the new entry to
* head of the cache bucket's list, if the cache bucket is out of room remove
* the last entry in the list first. It is important to note that there is
* currently no checking for duplicate keys. Returns zero on success,
* negative values on failure.
*
*/
int cipso_v4_cache_add(const unsigned char *cipso_ptr,
const struct netlbl_lsm_secattr *secattr)
{
int bkt_size = READ_ONCE(cipso_v4_cache_bucketsize);
int ret_val = -EPERM;
u32 bkt;
struct cipso_v4_map_cache_entry *entry = NULL;
struct cipso_v4_map_cache_entry *old_entry = NULL;
u32 cipso_ptr_len;
if (!READ_ONCE(cipso_v4_cache_enabled) || bkt_size <= 0)
return 0;
cipso_ptr_len = cipso_ptr[1];
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry)
return -ENOMEM;
entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC);
if (!entry->key) {
ret_val = -ENOMEM;
goto cache_add_failure;
}
entry->key_len = cipso_ptr_len;
entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len);
refcount_inc(&secattr->cache->refcount);
entry->lsm_data = secattr->cache;
bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1);
spin_lock_bh(&cipso_v4_cache[bkt].lock);
if (cipso_v4_cache[bkt].size < bkt_size) {
list_add(&entry->list, &cipso_v4_cache[bkt].list);
cipso_v4_cache[bkt].size += 1;
} else {
old_entry = list_entry(cipso_v4_cache[bkt].list.prev,
struct cipso_v4_map_cache_entry, list);
list_del(&old_entry->list);
list_add(&entry->list, &cipso_v4_cache[bkt].list);
cipso_v4_cache_entry_free(old_entry);
}
spin_unlock_bh(&cipso_v4_cache[bkt].lock);
return 0;
cache_add_failure:
if (entry)
cipso_v4_cache_entry_free(entry);
return ret_val;
}
/*
* DOI List Functions
*/
/**
* cipso_v4_doi_search - Searches for a DOI definition
* @doi: the DOI to search for
*
* Description:
* Search the DOI definition list for a DOI definition with a DOI value that
* matches @doi. The caller is responsible for calling rcu_read_[un]lock().
* Returns a pointer to the DOI definition on success and NULL on failure.
*/
static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi)
{
struct cipso_v4_doi *iter;
list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
if (iter->doi == doi && refcount_read(&iter->refcount))
return iter;
return NULL;
}
/**
* cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine
* @doi_def: the DOI structure
* @audit_info: NetLabel audit information
*
* Description:
* The caller defines a new DOI for use by the CIPSO engine and calls this
* function to add it to the list of acceptable domains. The caller must
* ensure that the mapping table specified in @doi_def->map meets all of the
* requirements of the mapping type (see cipso_ipv4.h for details). Returns
* zero on success and non-zero on failure.
*
*/
int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
struct netlbl_audit *audit_info)
{
int ret_val = -EINVAL;
u32 iter;
u32 doi;
u32 doi_type;
struct audit_buffer *audit_buf;
doi = doi_def->doi;
doi_type = doi_def->type;
if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
goto doi_add_return;
for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) {
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
break;
case CIPSO_V4_TAG_RANGE:
case CIPSO_V4_TAG_ENUM:
if (doi_def->type != CIPSO_V4_MAP_PASS)
goto doi_add_return;
break;
case CIPSO_V4_TAG_LOCAL:
if (doi_def->type != CIPSO_V4_MAP_LOCAL)
goto doi_add_return;
break;
case CIPSO_V4_TAG_INVALID:
if (iter == 0)
goto doi_add_return;
break;
default:
goto doi_add_return;
}
}
refcount_set(&doi_def->refcount, 1);
spin_lock(&cipso_v4_doi_list_lock);
if (cipso_v4_doi_search(doi_def->doi)) {
spin_unlock(&cipso_v4_doi_list_lock);
ret_val = -EEXIST;
goto doi_add_return;
}
list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list);
spin_unlock(&cipso_v4_doi_list_lock);
ret_val = 0;
doi_add_return:
audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info);
if (audit_buf) {
const char *type_str;
switch (doi_type) {
case CIPSO_V4_MAP_TRANS:
type_str = "trans";
break;
case CIPSO_V4_MAP_PASS:
type_str = "pass";
break;
case CIPSO_V4_MAP_LOCAL:
type_str = "local";
break;
default:
type_str = "(unknown)";
}
audit_log_format(audit_buf,
" cipso_doi=%u cipso_type=%s res=%u",
doi, type_str, ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
return ret_val;
}
/**
* cipso_v4_doi_free - Frees a DOI definition
* @doi_def: the DOI definition
*
* Description:
* This function frees all of the memory associated with a DOI definition.
*
*/
void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
{
if (!doi_def)
return;
switch (doi_def->type) {
case CIPSO_V4_MAP_TRANS:
kfree(doi_def->map.std->lvl.cipso);
kfree(doi_def->map.std->lvl.local);
kfree(doi_def->map.std->cat.cipso);
kfree(doi_def->map.std->cat.local);
kfree(doi_def->map.std);
break;
}
kfree(doi_def);
}
/**
* cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer
* @entry: the entry's RCU field
*
* Description:
* This function is designed to be used as a callback to the call_rcu()
* function so that the memory allocated to the DOI definition can be released
* safely.
*
*/
static void cipso_v4_doi_free_rcu(struct rcu_head *entry)
{
struct cipso_v4_doi *doi_def;
doi_def = container_of(entry, struct cipso_v4_doi, rcu);
cipso_v4_doi_free(doi_def);
}
/**
* cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine
* @doi: the DOI value
* @audit_info: NetLabel audit information
*
* Description:
* Removes a DOI definition from the CIPSO engine. The NetLabel routines will
* be called to release their own LSM domain mappings as well as our own
* domain list. Returns zero on success and negative values on failure.
*
*/
int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info)
{
int ret_val;
struct cipso_v4_doi *doi_def;
struct audit_buffer *audit_buf;
spin_lock(&cipso_v4_doi_list_lock);
doi_def = cipso_v4_doi_search(doi);
if (!doi_def) {
spin_unlock(&cipso_v4_doi_list_lock);
ret_val = -ENOENT;
goto doi_remove_return;
}
list_del_rcu(&doi_def->list);
spin_unlock(&cipso_v4_doi_list_lock);
cipso_v4_doi_putdef(doi_def);
ret_val = 0;
doi_remove_return:
audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info);
if (audit_buf) {
audit_log_format(audit_buf,
" cipso_doi=%u res=%u",
doi, ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
return ret_val;
}
/**
* cipso_v4_doi_getdef - Returns a reference to a valid DOI definition
* @doi: the DOI value
*
* Description:
* Searches for a valid DOI definition and if one is found it is returned to
* the caller. Otherwise NULL is returned. The caller must ensure that
* rcu_read_lock() is held while accessing the returned definition and the DOI
* definition reference count is decremented when the caller is done.
*
*/
struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
{
struct cipso_v4_doi *doi_def;
rcu_read_lock();
doi_def = cipso_v4_doi_search(doi);
if (!doi_def)
goto doi_getdef_return;
if (!refcount_inc_not_zero(&doi_def->refcount))
doi_def = NULL;
doi_getdef_return:
rcu_read_unlock();
return doi_def;
}
/**
* cipso_v4_doi_putdef - Releases a reference for the given DOI definition
* @doi_def: the DOI definition
*
* Description:
* Releases a DOI definition reference obtained from cipso_v4_doi_getdef().
*
*/
void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def)
{
if (!doi_def)
return;
if (!refcount_dec_and_test(&doi_def->refcount))
return;
cipso_v4_cache_invalidate();
call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu);
}
/**
* cipso_v4_doi_walk - Iterate through the DOI definitions
* @skip_cnt: skip past this number of DOI definitions, updated
* @callback: callback for each DOI definition
* @cb_arg: argument for the callback function
*
* Description:
* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
* For each entry call @callback, if @callback returns a negative value stop
* 'walking' through the list and return. Updates the value in @skip_cnt upon
* return. Returns zero on success, negative values on failure.
*
*/
int cipso_v4_doi_walk(u32 *skip_cnt,
int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
void *cb_arg)
{
int ret_val = -ENOENT;
u32 doi_cnt = 0;
struct cipso_v4_doi *iter_doi;
rcu_read_lock();
list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list)
if (refcount_read(&iter_doi->refcount) > 0) {
if (doi_cnt++ < *skip_cnt)
continue;
ret_val = callback(iter_doi, cb_arg);
if (ret_val < 0) {
doi_cnt--;
goto doi_walk_return;
}
}
doi_walk_return:
rcu_read_unlock();
*skip_cnt = doi_cnt;
return ret_val;
}
/*
* Label Mapping Functions
*/
/**
* cipso_v4_map_lvl_valid - Checks to see if the given level is understood
* @doi_def: the DOI definition
* @level: the level to check
*
* Description:
* Checks the given level against the given DOI definition and returns a
* negative value if the level does not have a valid mapping and a zero value
* if the level is defined by the DOI.
*
*/
static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level)
{
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
return 0;
case CIPSO_V4_MAP_TRANS:
if ((level < doi_def->map.std->lvl.cipso_size) &&
(doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL))
return 0;
break;
}
return -EFAULT;
}
/**
* cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network
* @doi_def: the DOI definition
* @host_lvl: the host MLS level
* @net_lvl: the network/CIPSO MLS level
*
* Description:
* Perform a label mapping to translate a local MLS level to the correct
* CIPSO level using the given DOI definition. Returns zero on success,
* negative values otherwise.
*
*/
static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def,
u32 host_lvl,
u32 *net_lvl)
{
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
*net_lvl = host_lvl;
return 0;
case CIPSO_V4_MAP_TRANS:
if (host_lvl < doi_def->map.std->lvl.local_size &&
doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) {
*net_lvl = doi_def->map.std->lvl.local[host_lvl];
return 0;
}
return -EPERM;
}
return -EINVAL;
}
/**
* cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host
* @doi_def: the DOI definition
* @net_lvl: the network/CIPSO MLS level
* @host_lvl: the host MLS level
*
* Description:
* Perform a label mapping to translate a CIPSO level to the correct local MLS
* level using the given DOI definition. Returns zero on success, negative
* values otherwise.
*
*/
static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def,
u32 net_lvl,
u32 *host_lvl)
{
struct cipso_v4_std_map_tbl *map_tbl;
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
*host_lvl = net_lvl;
return 0;
case CIPSO_V4_MAP_TRANS:
map_tbl = doi_def->map.std;
if (net_lvl < map_tbl->lvl.cipso_size &&
map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) {
*host_lvl = doi_def->map.std->lvl.cipso[net_lvl];
return 0;
}
return -EPERM;
}
return -EINVAL;
}
/**
* cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid
* @doi_def: the DOI definition
* @bitmap: category bitmap
* @bitmap_len: bitmap length in bytes
*
* Description:
* Checks the given category bitmap against the given DOI definition and
* returns a negative value if any of the categories in the bitmap do not have
* a valid mapping and a zero value if all of the categories are valid.
*
*/
static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def,
const unsigned char *bitmap,
u32 bitmap_len)
{
int cat = -1;
u32 bitmap_len_bits = bitmap_len * 8;
u32 cipso_cat_size;
u32 *cipso_array;
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
return 0;
case CIPSO_V4_MAP_TRANS:
cipso_cat_size = doi_def->map.std->cat.cipso_size;
cipso_array = doi_def->map.std->cat.cipso;
for (;;) {
cat = netlbl_bitmap_walk(bitmap,
bitmap_len_bits,
cat + 1,
1);
if (cat < 0)
break;
if (cat >= cipso_cat_size ||
cipso_array[cat] >= CIPSO_V4_INV_CAT)
return -EFAULT;
}
if (cat == -1)
return 0;
break;
}
return -EFAULT;
}
/**
* cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network
* @doi_def: the DOI definition
* @secattr: the security attributes
* @net_cat: the zero'd out category bitmap in network/CIPSO format
* @net_cat_len: the length of the CIPSO bitmap in bytes
*
* Description:
* Perform a label mapping to translate a local MLS category bitmap to the
* correct CIPSO bitmap using the given DOI definition. Returns the minimum
* size in bytes of the network bitmap on success, negative values otherwise.
*
*/
static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *net_cat,
u32 net_cat_len)
{
int host_spot = -1;
u32 net_spot = CIPSO_V4_INV_CAT;
u32 net_spot_max = 0;
u32 net_clen_bits = net_cat_len * 8;
u32 host_cat_size = 0;
u32 *host_cat_array = NULL;
if (doi_def->type == CIPSO_V4_MAP_TRANS) {
host_cat_size = doi_def->map.std->cat.local_size;
host_cat_array = doi_def->map.std->cat.local;
}
for (;;) {
host_spot = netlbl_catmap_walk(secattr->attr.mls.cat,
host_spot + 1);
if (host_spot < 0)
break;
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
net_spot = host_spot;
break;
case CIPSO_V4_MAP_TRANS:
if (host_spot >= host_cat_size)
return -EPERM;
net_spot = host_cat_array[host_spot];
if (net_spot >= CIPSO_V4_INV_CAT)
return -EPERM;
break;
}
if (net_spot >= net_clen_bits)
return -ENOSPC;
netlbl_bitmap_setbit(net_cat, net_spot, 1);
if (net_spot > net_spot_max)
net_spot_max = net_spot;
}
if (++net_spot_max % 8)
return net_spot_max / 8 + 1;
return net_spot_max / 8;
}
/**
* cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host
* @doi_def: the DOI definition
* @net_cat: the category bitmap in network/CIPSO format
* @net_cat_len: the length of the CIPSO bitmap in bytes
* @secattr: the security attributes
*
* Description:
* Perform a label mapping to translate a CIPSO bitmap to the correct local
* MLS category bitmap using the given DOI definition. Returns zero on
* success, negative values on failure.
*
*/
static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
const unsigned char *net_cat,
u32 net_cat_len,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
int net_spot = -1;
u32 host_spot = CIPSO_V4_INV_CAT;
u32 net_clen_bits = net_cat_len * 8;
u32 net_cat_size = 0;
u32 *net_cat_array = NULL;
if (doi_def->type == CIPSO_V4_MAP_TRANS) {
net_cat_size = doi_def->map.std->cat.cipso_size;
net_cat_array = doi_def->map.std->cat.cipso;
}
for (;;) {
net_spot = netlbl_bitmap_walk(net_cat,
net_clen_bits,
net_spot + 1,
1);
if (net_spot < 0)
return 0;
switch (doi_def->type) {
case CIPSO_V4_MAP_PASS:
host_spot = net_spot;
break;
case CIPSO_V4_MAP_TRANS:
if (net_spot >= net_cat_size)
return -EPERM;
host_spot = net_cat_array[net_spot];
if (host_spot >= CIPSO_V4_INV_CAT)
return -EPERM;
break;
}
ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
host_spot,
GFP_ATOMIC);
if (ret_val != 0)
return ret_val;
}
return -EINVAL;
}
/**
* cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid
* @doi_def: the DOI definition
* @enumcat: category list
* @enumcat_len: length of the category list in bytes
*
* Description:
* Checks the given categories against the given DOI definition and returns a
* negative value if any of the categories do not have a valid mapping and a
* zero value if all of the categories are valid.
*
*/
static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def,
const unsigned char *enumcat,
u32 enumcat_len)
{
u16 cat;
int cat_prev = -1;
u32 iter;
if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01)
return -EFAULT;
for (iter = 0; iter < enumcat_len; iter += 2) {
cat = get_unaligned_be16(&enumcat[iter]);
if (cat <= cat_prev)
return -EFAULT;
cat_prev = cat;
}
return 0;
}
/**
* cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network
* @doi_def: the DOI definition
* @secattr: the security attributes
* @net_cat: the zero'd out category list in network/CIPSO format
* @net_cat_len: the length of the CIPSO category list in bytes
*
* Description:
* Perform a label mapping to translate a local MLS category bitmap to the
* correct CIPSO category list using the given DOI definition. Returns the
* size in bytes of the network category bitmap on success, negative values
* otherwise.
*
*/
static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *net_cat,
u32 net_cat_len)
{
int cat = -1;
u32 cat_iter = 0;
for (;;) {
cat = netlbl_catmap_walk(secattr->attr.mls.cat, cat + 1);
if (cat < 0)
break;
if ((cat_iter + 2) > net_cat_len)
return -ENOSPC;
*((__be16 *)&net_cat[cat_iter]) = htons(cat);
cat_iter += 2;
}
return cat_iter;
}
/**
* cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host
* @doi_def: the DOI definition
* @net_cat: the category list in network/CIPSO format
* @net_cat_len: the length of the CIPSO bitmap in bytes
* @secattr: the security attributes
*
* Description:
* Perform a label mapping to translate a CIPSO category list to the correct
* local MLS category bitmap using the given DOI definition. Returns zero on
* success, negative values on failure.
*
*/
static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
const unsigned char *net_cat,
u32 net_cat_len,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u32 iter;
for (iter = 0; iter < net_cat_len; iter += 2) {
ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
get_unaligned_be16(&net_cat[iter]),
GFP_ATOMIC);
if (ret_val != 0)
return ret_val;
}
return 0;
}
/**
* cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid
* @doi_def: the DOI definition
* @rngcat: category list
* @rngcat_len: length of the category list in bytes
*
* Description:
* Checks the given categories against the given DOI definition and returns a
* negative value if any of the categories do not have a valid mapping and a
* zero value if all of the categories are valid.
*
*/
static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def,
const unsigned char *rngcat,
u32 rngcat_len)
{
u16 cat_high;
u16 cat_low;
u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1;
u32 iter;
if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01)
return -EFAULT;
for (iter = 0; iter < rngcat_len; iter += 4) {
cat_high = get_unaligned_be16(&rngcat[iter]);
if ((iter + 4) <= rngcat_len)
cat_low = get_unaligned_be16(&rngcat[iter + 2]);
else
cat_low = 0;
if (cat_high > cat_prev)
return -EFAULT;
cat_prev = cat_low;
}
return 0;
}
/**
* cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network
* @doi_def: the DOI definition
* @secattr: the security attributes
* @net_cat: the zero'd out category list in network/CIPSO format
* @net_cat_len: the length of the CIPSO category list in bytes
*
* Description:
* Perform a label mapping to translate a local MLS category bitmap to the
* correct CIPSO category list using the given DOI definition. Returns the
* size in bytes of the network category bitmap on success, negative values
* otherwise.
*
*/
static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *net_cat,
u32 net_cat_len)
{
int iter = -1;
u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2];
u32 array_cnt = 0;
u32 cat_size = 0;
/* make sure we don't overflow the 'array[]' variable */
if (net_cat_len >
(CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN))
return -ENOSPC;
for (;;) {
iter = netlbl_catmap_walk(secattr->attr.mls.cat, iter + 1);
if (iter < 0)
break;
cat_size += (iter == 0 ? 0 : sizeof(u16));
if (cat_size > net_cat_len)
return -ENOSPC;
array[array_cnt++] = iter;
iter = netlbl_catmap_walkrng(secattr->attr.mls.cat, iter);
if (iter < 0)
return -EFAULT;
cat_size += sizeof(u16);
if (cat_size > net_cat_len)
return -ENOSPC;
array[array_cnt++] = iter;
}
for (iter = 0; array_cnt > 0;) {
*((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]);
iter += 2;
array_cnt--;
if (array[array_cnt] != 0) {
*((__be16 *)&net_cat[iter]) = htons(array[array_cnt]);
iter += 2;
}
}
return cat_size;
}
/**
* cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host
* @doi_def: the DOI definition
* @net_cat: the category list in network/CIPSO format
* @net_cat_len: the length of the CIPSO bitmap in bytes
* @secattr: the security attributes
*
* Description:
* Perform a label mapping to translate a CIPSO category list to the correct
* local MLS category bitmap using the given DOI definition. Returns zero on
* success, negative values on failure.
*
*/
static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def,
const unsigned char *net_cat,
u32 net_cat_len,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u32 net_iter;
u16 cat_low;
u16 cat_high;
for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) {
cat_high = get_unaligned_be16(&net_cat[net_iter]);
if ((net_iter + 4) <= net_cat_len)
cat_low = get_unaligned_be16(&net_cat[net_iter + 2]);
else
cat_low = 0;
ret_val = netlbl_catmap_setrng(&secattr->attr.mls.cat,
cat_low,
cat_high,
GFP_ATOMIC);
if (ret_val != 0)
return ret_val;
}
return 0;
}
/*
* Protocol Handling Functions
*/
/**
* cipso_v4_gentag_hdr - Generate a CIPSO option header
* @doi_def: the DOI definition
* @len: the total tag length in bytes, not including this header
* @buf: the CIPSO option buffer
*
* Description:
* Write a CIPSO header into the beginning of @buffer.
*
*/
static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def,
unsigned char *buf,
u32 len)
{
buf[0] = IPOPT_CIPSO;
buf[1] = CIPSO_V4_HDR_LEN + len;
put_unaligned_be32(doi_def->doi, &buf[2]);
}
/**
* cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1)
* @doi_def: the DOI definition
* @secattr: the security attributes
* @buffer: the option buffer
* @buffer_len: length of buffer in bytes
*
* Description:
* Generate a CIPSO option using the restricted bitmap tag, tag type #1. The
* actual buffer length may be larger than the indicated size due to
* translation between host and network category bitmaps. Returns the size of
* the tag on success, negative values on failure.
*
*/
static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *buffer,
u32 buffer_len)
{
int ret_val;
u32 tag_len;
u32 level;
if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
return -EPERM;
ret_val = cipso_v4_map_lvl_hton(doi_def,
secattr->attr.mls.lvl,
&level);
if (ret_val != 0)
return ret_val;
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
ret_val = cipso_v4_map_cat_rbm_hton(doi_def,
secattr,
&buffer[4],
buffer_len - 4);
if (ret_val < 0)
return ret_val;
/* This will send packets using the "optimized" format when
* possible as specified in section 3.4.2.6 of the
* CIPSO draft. */
if (READ_ONCE(cipso_v4_rbm_optfmt) && ret_val > 0 &&
ret_val <= 10)
tag_len = 14;
else
tag_len = 4 + ret_val;
} else
tag_len = 4;
buffer[0] = CIPSO_V4_TAG_RBITMAP;
buffer[1] = tag_len;
buffer[3] = level;
return tag_len;
}
/**
* cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag
* @doi_def: the DOI definition
* @tag: the CIPSO tag
* @secattr: the security attributes
*
* Description:
* Parse a CIPSO restricted bitmap tag (tag type #1) and return the security
* attributes in @secattr. Return zero on success, negatives values on
* failure.
*
*/
static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
const unsigned char *tag,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u8 tag_len = tag[1];
u32 level;
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def,
&tag[4],
tag_len - 4,
secattr);
if (ret_val != 0) {
netlbl_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
if (secattr->attr.mls.cat)
secattr->flags |= NETLBL_SECATTR_MLS_CAT;
}
return 0;
}
/**
* cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2)
* @doi_def: the DOI definition
* @secattr: the security attributes
* @buffer: the option buffer
* @buffer_len: length of buffer in bytes
*
* Description:
* Generate a CIPSO option using the enumerated tag, tag type #2. Returns the
* size of the tag on success, negative values on failure.
*
*/
static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *buffer,
u32 buffer_len)
{
int ret_val;
u32 tag_len;
u32 level;
if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
return -EPERM;
ret_val = cipso_v4_map_lvl_hton(doi_def,
secattr->attr.mls.lvl,
&level);
if (ret_val != 0)
return ret_val;
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
ret_val = cipso_v4_map_cat_enum_hton(doi_def,
secattr,
&buffer[4],
buffer_len - 4);
if (ret_val < 0)
return ret_val;
tag_len = 4 + ret_val;
} else
tag_len = 4;
buffer[0] = CIPSO_V4_TAG_ENUM;
buffer[1] = tag_len;
buffer[3] = level;
return tag_len;
}
/**
* cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag
* @doi_def: the DOI definition
* @tag: the CIPSO tag
* @secattr: the security attributes
*
* Description:
* Parse a CIPSO enumerated tag (tag type #2) and return the security
* attributes in @secattr. Return zero on success, negatives values on
* failure.
*
*/
static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
const unsigned char *tag,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u8 tag_len = tag[1];
u32 level;
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
ret_val = cipso_v4_map_cat_enum_ntoh(doi_def,
&tag[4],
tag_len - 4,
secattr);
if (ret_val != 0) {
netlbl_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
secattr->flags |= NETLBL_SECATTR_MLS_CAT;
}
return 0;
}
/**
* cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5)
* @doi_def: the DOI definition
* @secattr: the security attributes
* @buffer: the option buffer
* @buffer_len: length of buffer in bytes
*
* Description:
* Generate a CIPSO option using the ranged tag, tag type #5. Returns the
* size of the tag on success, negative values on failure.
*
*/
static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *buffer,
u32 buffer_len)
{
int ret_val;
u32 tag_len;
u32 level;
if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
return -EPERM;
ret_val = cipso_v4_map_lvl_hton(doi_def,
secattr->attr.mls.lvl,
&level);
if (ret_val != 0)
return ret_val;
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
ret_val = cipso_v4_map_cat_rng_hton(doi_def,
secattr,
&buffer[4],
buffer_len - 4);
if (ret_val < 0)
return ret_val;
tag_len = 4 + ret_val;
} else
tag_len = 4;
buffer[0] = CIPSO_V4_TAG_RANGE;
buffer[1] = tag_len;
buffer[3] = level;
return tag_len;
}
/**
* cipso_v4_parsetag_rng - Parse a CIPSO ranged tag
* @doi_def: the DOI definition
* @tag: the CIPSO tag
* @secattr: the security attributes
*
* Description:
* Parse a CIPSO ranged tag (tag type #5) and return the security attributes
* in @secattr. Return zero on success, negatives values on failure.
*
*/
static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
const unsigned char *tag,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u8 tag_len = tag[1];
u32 level;
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
ret_val = cipso_v4_map_cat_rng_ntoh(doi_def,
&tag[4],
tag_len - 4,
secattr);
if (ret_val != 0) {
netlbl_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
if (secattr->attr.mls.cat)
secattr->flags |= NETLBL_SECATTR_MLS_CAT;
}
return 0;
}
/**
* cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard)
* @doi_def: the DOI definition
* @secattr: the security attributes
* @buffer: the option buffer
* @buffer_len: length of buffer in bytes
*
* Description:
* Generate a CIPSO option using the local tag. Returns the size of the tag
* on success, negative values on failure.
*
*/
static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
unsigned char *buffer,
u32 buffer_len)
{
if (!(secattr->flags & NETLBL_SECATTR_SECID))
return -EPERM;
buffer[0] = CIPSO_V4_TAG_LOCAL;
buffer[1] = CIPSO_V4_TAG_LOC_BLEN;
*(u32 *)&buffer[2] = secattr->attr.secid;
return CIPSO_V4_TAG_LOC_BLEN;
}
/**
* cipso_v4_parsetag_loc - Parse a CIPSO local tag
* @doi_def: the DOI definition
* @tag: the CIPSO tag
* @secattr: the security attributes
*
* Description:
* Parse a CIPSO local tag and return the security attributes in @secattr.
* Return zero on success, negatives values on failure.
*
*/
static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def,
const unsigned char *tag,
struct netlbl_lsm_secattr *secattr)
{
secattr->attr.secid = *(u32 *)&tag[2];
secattr->flags |= NETLBL_SECATTR_SECID;
return 0;
}
/**
* cipso_v4_optptr - Find the CIPSO option in the packet
* @skb: the packet
*
* Description:
* Parse the packet's IP header looking for a CIPSO option. Returns a pointer
* to the start of the CIPSO option on success, NULL if one is not found.
*
*/
unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
unsigned char *optptr = (unsigned char *)&(ip_hdr(skb)[1]);
int optlen;
int taglen;
for (optlen = iph->ihl*4 - sizeof(struct iphdr); optlen > 1; ) {
switch (optptr[0]) {
case IPOPT_END:
return NULL;
case IPOPT_NOOP:
taglen = 1;
break;
default:
taglen = optptr[1];
}
if (!taglen || taglen > optlen)
return NULL;
if (optptr[0] == IPOPT_CIPSO)
return optptr;
optlen -= taglen;
optptr += taglen;
}
return NULL;
}
/**
* cipso_v4_validate - Validate a CIPSO option
* @skb: the packet
* @option: the start of the option, on error it is set to point to the error
*
* Description:
* This routine is called to validate a CIPSO option, it checks all of the
* fields to ensure that they are at least valid, see the draft snippet below
* for details. If the option is valid then a zero value is returned and
* the value of @option is unchanged. If the option is invalid then a
* non-zero value is returned and @option is adjusted to point to the
* offending portion of the option. From the IETF draft ...
*
* "If any field within the CIPSO options, such as the DOI identifier, is not
* recognized the IP datagram is discarded and an ICMP 'parameter problem'
* (type 12) is generated and returned. The ICMP code field is set to 'bad
* parameter' (code 0) and the pointer is set to the start of the CIPSO field
* that is unrecognized."
*
*/
int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option)
{
unsigned char *opt = *option;
unsigned char *tag;
unsigned char opt_iter;
unsigned char err_offset = 0;
u8 opt_len;
u8 tag_len;
struct cipso_v4_doi *doi_def = NULL;
u32 tag_iter;
/* caller already checks for length values that are too large */
opt_len = opt[1];
if (opt_len < 8) {
err_offset = 1;
goto validate_return;
}
rcu_read_lock();
doi_def = cipso_v4_doi_search(get_unaligned_be32(&opt[2]));
if (!doi_def) {
err_offset = 2;
goto validate_return_locked;
}
opt_iter = CIPSO_V4_HDR_LEN;
tag = opt + opt_iter;
while (opt_iter < opt_len) {
for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];)
if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID ||
++tag_iter == CIPSO_V4_TAG_MAXCNT) {
err_offset = opt_iter;
goto validate_return_locked;
}
if (opt_iter + 1 == opt_len) {
err_offset = opt_iter;
goto validate_return_locked;
}
tag_len = tag[1];
if (tag_len > (opt_len - opt_iter)) {
err_offset = opt_iter + 1;
goto validate_return_locked;
}
switch (tag[0]) {
case CIPSO_V4_TAG_RBITMAP:
if (tag_len < CIPSO_V4_TAG_RBM_BLEN) {
err_offset = opt_iter + 1;
goto validate_return_locked;
}
/* We are already going to do all the verification
* necessary at the socket layer so from our point of
* view it is safe to turn these checks off (and less
* work), however, the CIPSO draft says we should do
* all the CIPSO validations here but it doesn't
* really specify _exactly_ what we need to validate
* ... so, just make it a sysctl tunable. */
if (READ_ONCE(cipso_v4_rbm_strictvalid)) {
if (cipso_v4_map_lvl_valid(doi_def,
tag[3]) < 0) {
err_offset = opt_iter + 3;
goto validate_return_locked;
}
if (tag_len > CIPSO_V4_TAG_RBM_BLEN &&
cipso_v4_map_cat_rbm_valid(doi_def,
&tag[4],
tag_len - 4) < 0) {
err_offset = opt_iter + 4;
goto validate_return_locked;
}
}
break;
case CIPSO_V4_TAG_ENUM:
if (tag_len < CIPSO_V4_TAG_ENUM_BLEN) {
err_offset = opt_iter + 1;
goto validate_return_locked;
}
if (cipso_v4_map_lvl_valid(doi_def,
tag[3]) < 0) {
err_offset = opt_iter + 3;
goto validate_return_locked;
}
if (tag_len > CIPSO_V4_TAG_ENUM_BLEN &&
cipso_v4_map_cat_enum_valid(doi_def,
&tag[4],
tag_len - 4) < 0) {
err_offset = opt_iter + 4;
goto validate_return_locked;
}
break;
case CIPSO_V4_TAG_RANGE:
if (tag_len < CIPSO_V4_TAG_RNG_BLEN) {
err_offset = opt_iter + 1;
goto validate_return_locked;
}
if (cipso_v4_map_lvl_valid(doi_def,
tag[3]) < 0) {
err_offset = opt_iter + 3;
goto validate_return_locked;
}
if (tag_len > CIPSO_V4_TAG_RNG_BLEN &&
cipso_v4_map_cat_rng_valid(doi_def,
&tag[4],
tag_len - 4) < 0) {
err_offset = opt_iter + 4;
goto validate_return_locked;
}
break;
case CIPSO_V4_TAG_LOCAL:
/* This is a non-standard tag that we only allow for
* local connections, so if the incoming interface is
* not the loopback device drop the packet. Further,
* there is no legitimate reason for setting this from
* userspace so reject it if skb is NULL. */
if (!skb || !(skb->dev->flags & IFF_LOOPBACK)) {
err_offset = opt_iter;
goto validate_return_locked;
}
if (tag_len != CIPSO_V4_TAG_LOC_BLEN) {
err_offset = opt_iter + 1;
goto validate_return_locked;
}
break;
default:
err_offset = opt_iter;
goto validate_return_locked;
}
tag += tag_len;
opt_iter += tag_len;
}
validate_return_locked:
rcu_read_unlock();
validate_return:
*option = opt + err_offset;
return err_offset;
}
/**
* cipso_v4_error - Send the correct response for a bad packet
* @skb: the packet
* @error: the error code
* @gateway: CIPSO gateway flag
*
* Description:
* Based on the error code given in @error, send an ICMP error message back to
* the originating host. From the IETF draft ...
*
* "If the contents of the CIPSO [option] are valid but the security label is
* outside of the configured host or port label range, the datagram is
* discarded and an ICMP 'destination unreachable' (type 3) is generated and
* returned. The code field of the ICMP is set to 'communication with
* destination network administratively prohibited' (code 9) or to
* 'communication with destination host administratively prohibited'
* (code 10). The value of the code is dependent on whether the originator
* of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The
* recipient of the ICMP message MUST be able to handle either value. The
* same procedure is performed if a CIPSO [option] can not be added to an
* IP packet because it is too large to fit in the IP options area."
*
* "If the error is triggered by receipt of an ICMP message, the message is
* discarded and no response is permitted (consistent with general ICMP
* processing rules)."
*
*/
void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway)
{
unsigned char optbuf[sizeof(struct ip_options) + 40];
struct ip_options *opt = (struct ip_options *)optbuf;
int res;
if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES)
return;
/*
* We might be called above the IP layer,
* so we can not use icmp_send and IPCB here.
*/
memset(opt, 0, sizeof(struct ip_options));
opt->optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr);
rcu_read_lock();
res = __ip_options_compile(dev_net(skb->dev), opt, skb, NULL);
rcu_read_unlock();
if (res)
return;
if (gateway)
__icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0, opt);
else
__icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0, opt);
}
/**
* cipso_v4_genopt - Generate a CIPSO option
* @buf: the option buffer
* @buf_len: the size of opt_buf
* @doi_def: the CIPSO DOI to use
* @secattr: the security attributes
*
* Description:
* Generate a CIPSO option using the DOI definition and security attributes
* passed to the function. Returns the length of the option on success and
* negative values on failure.
*
*/
static int cipso_v4_genopt(unsigned char *buf, u32 buf_len,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
u32 iter;
if (buf_len <= CIPSO_V4_HDR_LEN)
return -ENOSPC;
/* XXX - This code assumes only one tag per CIPSO option which isn't
* really a good assumption to make but since we only support the MAC
* tags right now it is a safe assumption. */
iter = 0;
do {
memset(buf, 0, buf_len);
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_gentag_rbm(doi_def,
secattr,
&buf[CIPSO_V4_HDR_LEN],
buf_len - CIPSO_V4_HDR_LEN);
break;
case CIPSO_V4_TAG_ENUM:
ret_val = cipso_v4_gentag_enum(doi_def,
secattr,
&buf[CIPSO_V4_HDR_LEN],
buf_len - CIPSO_V4_HDR_LEN);
break;
case CIPSO_V4_TAG_RANGE:
ret_val = cipso_v4_gentag_rng(doi_def,
secattr,
&buf[CIPSO_V4_HDR_LEN],
buf_len - CIPSO_V4_HDR_LEN);
break;
case CIPSO_V4_TAG_LOCAL:
ret_val = cipso_v4_gentag_loc(doi_def,
secattr,
&buf[CIPSO_V4_HDR_LEN],
buf_len - CIPSO_V4_HDR_LEN);
break;
default:
return -EPERM;
}
iter++;
} while (ret_val < 0 &&
iter < CIPSO_V4_TAG_MAXCNT &&
doi_def->tags[iter] != CIPSO_V4_TAG_INVALID);
if (ret_val < 0)
return ret_val;
cipso_v4_gentag_hdr(doi_def, buf, ret_val);
return CIPSO_V4_HDR_LEN + ret_val;
}
static int cipso_v4_get_actual_opt_len(const unsigned char *data, int len)
{
int iter = 0, optlen = 0;
/* determining the new total option length is tricky because of
* the padding necessary, the only thing i can think to do at
* this point is walk the options one-by-one, skipping the
* padding at the end to determine the actual option size and
* from there we can determine the new total option length
*/
while (iter < len) {
if (data[iter] == IPOPT_END) {
break;
} else if (data[iter] == IPOPT_NOP) {
iter++;
} else {
iter += data[iter + 1];
optlen = iter;
}
}
return optlen;
}
/**
* cipso_v4_sock_setattr - Add a CIPSO option to a socket
* @sk: the socket
* @doi_def: the CIPSO DOI to use
* @secattr: the specific security attributes of the socket
* @sk_locked: true if caller holds the socket lock
*
* Description:
* Set the CIPSO option on the given socket using the DOI definition and
* security attributes passed to the function. This function requires
* exclusive access to @sk, which means it either needs to be in the
* process of being created or locked. Returns zero on success and negative
* values on failure.
*
*/
int cipso_v4_sock_setattr(struct sock *sk,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
bool sk_locked)
{
int ret_val = -EPERM;
unsigned char *buf = NULL;
u32 buf_len;
u32 opt_len;
struct ip_options_rcu *old, *opt = NULL;
struct inet_sock *sk_inet;
struct inet_connection_sock *sk_conn;
/* In the case of sock_create_lite(), the sock->sk field is not
* defined yet but it is not a problem as the only users of these
* "lite" PF_INET sockets are functions which do an accept() call
* afterwards so we will label the socket as part of the accept(). */
if (!sk)
return 0;
/* We allocate the maximum CIPSO option size here so we are probably
* being a little wasteful, but it makes our life _much_ easier later
* on and after all we are only talking about 40 bytes. */
buf_len = CIPSO_V4_OPT_LEN_MAX;
buf = kmalloc(buf_len, GFP_ATOMIC);
if (!buf) {
ret_val = -ENOMEM;
goto socket_setattr_failure;
}
ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
if (ret_val < 0)
goto socket_setattr_failure;
buf_len = ret_val;
/* We can't use ip_options_get() directly because it makes a call to
* ip_options_get_alloc() which allocates memory with GFP_KERNEL and
* we won't always have CAP_NET_RAW even though we _always_ want to
* set the IPOPT_CIPSO option. */
opt_len = (buf_len + 3) & ~3;
opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
if (!opt) {
ret_val = -ENOMEM;
goto socket_setattr_failure;
}
memcpy(opt->opt.__data, buf, buf_len);
opt->opt.optlen = opt_len;
opt->opt.cipso = sizeof(struct iphdr);
kfree(buf);
buf = NULL;
sk_inet = inet_sk(sk);
old = rcu_dereference_protected(sk_inet->inet_opt, sk_locked);
if (inet_test_bit(IS_ICSK, sk)) {
sk_conn = inet_csk(sk);
if (old)
sk_conn->icsk_ext_hdr_len -= old->opt.optlen;
sk_conn->icsk_ext_hdr_len += opt->opt.optlen;
sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
}
rcu_assign_pointer(sk_inet->inet_opt, opt);
if (old)
kfree_rcu(old, rcu);
return 0;
socket_setattr_failure:
kfree(buf);
kfree(opt);
return ret_val;
}
/**
* cipso_v4_req_setattr - Add a CIPSO option to a connection request socket
* @req: the connection request socket
* @doi_def: the CIPSO DOI to use
* @secattr: the specific security attributes of the socket
*
* Description:
* Set the CIPSO option on the given socket using the DOI definition and
* security attributes passed to the function. Returns zero on success and
* negative values on failure.
*
*/
int cipso_v4_req_setattr(struct request_sock *req,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -EPERM;
unsigned char *buf = NULL;
u32 buf_len;
u32 opt_len;
struct ip_options_rcu *opt = NULL;
struct inet_request_sock *req_inet;
/* We allocate the maximum CIPSO option size here so we are probably
* being a little wasteful, but it makes our life _much_ easier later
* on and after all we are only talking about 40 bytes. */
buf_len = CIPSO_V4_OPT_LEN_MAX;
buf = kmalloc(buf_len, GFP_ATOMIC);
if (!buf) {
ret_val = -ENOMEM;
goto req_setattr_failure;
}
ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
if (ret_val < 0)
goto req_setattr_failure;
buf_len = ret_val;
/* We can't use ip_options_get() directly because it makes a call to
* ip_options_get_alloc() which allocates memory with GFP_KERNEL and
* we won't always have CAP_NET_RAW even though we _always_ want to
* set the IPOPT_CIPSO option. */
opt_len = (buf_len + 3) & ~3;
opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
if (!opt) {
ret_val = -ENOMEM;
goto req_setattr_failure;
}
memcpy(opt->opt.__data, buf, buf_len);
opt->opt.optlen = opt_len;
opt->opt.cipso = sizeof(struct iphdr);
kfree(buf);
buf = NULL;
req_inet = inet_rsk(req);
opt = unrcu_pointer(xchg(&req_inet->ireq_opt, RCU_INITIALIZER(opt)));
if (opt)
kfree_rcu(opt, rcu);
return 0;
req_setattr_failure:
kfree(buf);
kfree(opt);
return ret_val;
}
/**
* cipso_v4_delopt - Delete the CIPSO option from a set of IP options
* @opt_ptr: IP option pointer
*
* Description:
* Deletes the CIPSO IP option from a set of IP options and makes the necessary
* adjustments to the IP option structure. Returns zero on success, negative
* values on failure.
*
*/
static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr)
{
struct ip_options_rcu *opt = rcu_dereference_protected(*opt_ptr, 1);
int hdr_delta = 0;
if (!opt || opt->opt.cipso == 0)
return 0;
if (opt->opt.srr || opt->opt.rr || opt->opt.ts || opt->opt.router_alert) {
u8 cipso_len;
u8 cipso_off;
unsigned char *cipso_ptr;
int optlen_new;
cipso_off = opt->opt.cipso - sizeof(struct iphdr);
cipso_ptr = &opt->opt.__data[cipso_off];
cipso_len = cipso_ptr[1];
if (opt->opt.srr > opt->opt.cipso)
opt->opt.srr -= cipso_len;
if (opt->opt.rr > opt->opt.cipso)
opt->opt.rr -= cipso_len;
if (opt->opt.ts > opt->opt.cipso)
opt->opt.ts -= cipso_len;
if (opt->opt.router_alert > opt->opt.cipso)
opt->opt.router_alert -= cipso_len;
opt->opt.cipso = 0;
memmove(cipso_ptr, cipso_ptr + cipso_len,
opt->opt.optlen - cipso_off - cipso_len);
optlen_new = cipso_v4_get_actual_opt_len(opt->opt.__data,
opt->opt.optlen);
hdr_delta = opt->opt.optlen;
opt->opt.optlen = (optlen_new + 3) & ~3;
hdr_delta -= opt->opt.optlen;
} else {
/* only the cipso option was present on the socket so we can
* remove the entire option struct */
*opt_ptr = NULL;
hdr_delta = opt->opt.optlen;
kfree_rcu(opt, rcu);
}
return hdr_delta;
}
/**
* cipso_v4_sock_delattr - Delete the CIPSO option from a socket
* @sk: the socket
*
* Description:
* Removes the CIPSO option from a socket, if present.
*
*/
void cipso_v4_sock_delattr(struct sock *sk)
{
struct inet_sock *sk_inet;
int hdr_delta;
sk_inet = inet_sk(sk);
hdr_delta = cipso_v4_delopt(&sk_inet->inet_opt);
if (inet_test_bit(IS_ICSK, sk) && hdr_delta > 0) {
struct inet_connection_sock *sk_conn = inet_csk(sk);
sk_conn->icsk_ext_hdr_len -= hdr_delta;
sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
}
}
/**
* cipso_v4_req_delattr - Delete the CIPSO option from a request socket
* @req: the request socket
*
* Description:
* Removes the CIPSO option from a request socket, if present.
*
*/
void cipso_v4_req_delattr(struct request_sock *req)
{
cipso_v4_delopt(&inet_rsk(req)->ireq_opt);
}
/**
* cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions
* @cipso: the CIPSO v4 option
* @secattr: the security attributes
*
* Description:
* Inspect @cipso and return the security attributes in @secattr. Returns zero
* on success and negative values on failure.
*
*/
int cipso_v4_getattr(const unsigned char *cipso,
struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
u32 doi;
struct cipso_v4_doi *doi_def;
if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0)
return 0;
doi = get_unaligned_be32(&cipso[2]);
rcu_read_lock();
doi_def = cipso_v4_doi_search(doi);
if (!doi_def)
goto getattr_return;
/* XXX - This code assumes only one tag per CIPSO option which isn't
* really a good assumption to make but since we only support the MAC
* tags right now it is a safe assumption. */
switch (cipso[6]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr);
break;
case CIPSO_V4_TAG_ENUM:
ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr);
break;
case CIPSO_V4_TAG_RANGE:
ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr);
break;
case CIPSO_V4_TAG_LOCAL:
ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr);
break;
}
if (ret_val == 0)
secattr->type = NETLBL_NLTYPE_CIPSOV4;
getattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* cipso_v4_sock_getattr - Get the security attributes from a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
* Query @sk to see if there is a CIPSO option attached to the sock and if
* there is return the CIPSO security attributes in @secattr. This function
* requires that @sk be locked, or privately held, but it does not do any
* locking itself. Returns zero on success and negative values on failure.
*
*/
int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
struct ip_options_rcu *opt;
int res = -ENOMSG;
rcu_read_lock();
opt = rcu_dereference(inet_sk(sk)->inet_opt);
if (opt && opt->opt.cipso)
res = cipso_v4_getattr(opt->opt.__data +
opt->opt.cipso -
sizeof(struct iphdr),
secattr);
rcu_read_unlock();
return res;
}
/**
* cipso_v4_skbuff_setattr - Set the CIPSO option on a packet
* @skb: the packet
* @doi_def: the DOI structure
* @secattr: the security attributes
*
* Description:
* Set the CIPSO option on the given packet based on the security attributes.
* Returns a pointer to the IP header on success and NULL on failure.
*
*/
int cipso_v4_skbuff_setattr(struct sk_buff *skb,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
struct iphdr *iph;
struct ip_options *opt = &IPCB(skb)->opt;
unsigned char buf[CIPSO_V4_OPT_LEN_MAX];
u32 buf_len = CIPSO_V4_OPT_LEN_MAX;
u32 opt_len;
int len_delta;
ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
if (ret_val < 0)
return ret_val;
buf_len = ret_val;
opt_len = (buf_len + 3) & ~3;
/* we overwrite any existing options to ensure that we have enough
* room for the CIPSO option, the reason is that we _need_ to guarantee
* that the security label is applied to the packet - we do the same
* thing when using the socket options and it hasn't caused a problem,
* if we need to we can always revisit this choice later */
len_delta = opt_len - opt->optlen;
/* if we don't ensure enough headroom we could panic on the skb_push()
* call below so make sure we have enough, we are also "mangling" the
* packet so we should probably do a copy-on-write call anyway */
ret_val = skb_cow(skb, skb_headroom(skb) + len_delta);
if (ret_val < 0)
return ret_val;
if (len_delta > 0) {
/* we assume that the header + opt->optlen have already been
* "pushed" in ip_options_build() or similar */
iph = ip_hdr(skb);
skb_push(skb, len_delta);
memmove((char *)iph - len_delta, iph, iph->ihl << 2);
skb_reset_network_header(skb);
iph = ip_hdr(skb);
} else if (len_delta < 0) {
iph = ip_hdr(skb);
memset(iph + 1, IPOPT_NOP, opt->optlen);
} else
iph = ip_hdr(skb);
if (opt->optlen > 0)
memset(opt, 0, sizeof(*opt));
opt->optlen = opt_len;
opt->cipso = sizeof(struct iphdr);
opt->is_changed = 1;
/* we have to do the following because we are being called from a
* netfilter hook which means the packet already has had the header
* fields populated and the checksum calculated - yes this means we
* are doing more work than needed but we do it to keep the core
* stack clean and tidy */
memcpy(iph + 1, buf, buf_len);
if (opt_len > buf_len)
memset((char *)(iph + 1) + buf_len, 0, opt_len - buf_len);
if (len_delta != 0) {
iph->ihl = 5 + (opt_len >> 2);
iph_set_totlen(iph, skb->len);
}
ip_send_check(iph);
return 0;
}
/**
* cipso_v4_skbuff_delattr - Delete any CIPSO options from a packet
* @skb: the packet
*
* Description:
* Removes any and all CIPSO options from the given packet. Returns zero on
* success, negative values on failure.
*
*/
int cipso_v4_skbuff_delattr(struct sk_buff *skb)
{
int ret_val, cipso_len, hdr_len_actual, new_hdr_len_actual, new_hdr_len,
hdr_len_delta;
struct iphdr *iph;
struct ip_options *opt = &IPCB(skb)->opt;
unsigned char *cipso_ptr;
if (opt->cipso == 0)
return 0;
/* since we are changing the packet we should make a copy */
ret_val = skb_cow(skb, skb_headroom(skb));
if (ret_val < 0)
return ret_val;
iph = ip_hdr(skb);
cipso_ptr = (unsigned char *)iph + opt->cipso;
cipso_len = cipso_ptr[1];
hdr_len_actual = sizeof(struct iphdr) +
cipso_v4_get_actual_opt_len((unsigned char *)(iph + 1),
opt->optlen);
new_hdr_len_actual = hdr_len_actual - cipso_len;
new_hdr_len = (new_hdr_len_actual + 3) & ~3;
hdr_len_delta = (iph->ihl << 2) - new_hdr_len;
/* 1. shift any options after CIPSO to the left */
memmove(cipso_ptr, cipso_ptr + cipso_len,
new_hdr_len_actual - opt->cipso);
/* 2. move the whole IP header to its new place */
memmove((unsigned char *)iph + hdr_len_delta, iph, new_hdr_len_actual);
/* 3. adjust the skb layout */
skb_pull(skb, hdr_len_delta);
skb_reset_network_header(skb);
iph = ip_hdr(skb);
/* 4. re-fill new padding with IPOPT_END (may now be longer) */
memset((unsigned char *)iph + new_hdr_len_actual, IPOPT_END,
new_hdr_len - new_hdr_len_actual);
opt->optlen -= hdr_len_delta;
opt->cipso = 0;
opt->is_changed = 1;
if (hdr_len_delta != 0) {
iph->ihl = new_hdr_len >> 2;
iph_set_totlen(iph, skb->len);
}
ip_send_check(iph);
return 0;
}
/*
* Setup Functions
*/
/**
* cipso_v4_init - Initialize the CIPSO module
*
* Description:
* Initialize the CIPSO module and prepare it for use. Returns zero on success
* and negative values on failure.
*
*/
static int __init cipso_v4_init(void)
{
int ret_val;
ret_val = cipso_v4_cache_init();
if (ret_val != 0)
panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n",
ret_val);
return 0;
}
subsys_initcall(cipso_v4_init);
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