mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
20e2a86485
When NetLabel is not enabled, e.g. CONFIG_NETLABEL=n, and the system receives a CIPSO tagged packet it is dropped (cipso_v4_validate() returns non-zero). In most cases this is the correct and desired behavior, however, in the case where we are simply forwarding the traffic, e.g. acting as a network bridge, this becomes a problem. This patch fixes the forwarding problem by providing the basic CIPSO validation code directly in ip_options_compile() without the need for the NetLabel or CIPSO code. The new validation code can not perform any of the CIPSO option label/value verification that cipso_v4_validate() does, but it can verify the basic CIPSO option format. The behavior when NetLabel is enabled is unchanged. Signed-off-by: Paul Moore <pmoore@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
319 lines
7.9 KiB
C
319 lines
7.9 KiB
C
/*
|
|
* 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, copies of both documents can be found in the Documentation
|
|
* directory. 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.
|
|
*
|
|
* Author: Paul Moore <paul@paul-moore.com>
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
* the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#ifndef _CIPSO_IPV4_H
|
|
#define _CIPSO_IPV4_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/list.h>
|
|
#include <linux/net.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/netlabel.h>
|
|
#include <net/request_sock.h>
|
|
#include <linux/atomic.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
/* known doi values */
|
|
#define CIPSO_V4_DOI_UNKNOWN 0x00000000
|
|
|
|
/* standard tag types */
|
|
#define CIPSO_V4_TAG_INVALID 0
|
|
#define CIPSO_V4_TAG_RBITMAP 1
|
|
#define CIPSO_V4_TAG_ENUM 2
|
|
#define CIPSO_V4_TAG_RANGE 5
|
|
#define CIPSO_V4_TAG_PBITMAP 6
|
|
#define CIPSO_V4_TAG_FREEFORM 7
|
|
|
|
/* non-standard tag types (tags > 127) */
|
|
#define CIPSO_V4_TAG_LOCAL 128
|
|
|
|
/* doi mapping types */
|
|
#define CIPSO_V4_MAP_UNKNOWN 0
|
|
#define CIPSO_V4_MAP_TRANS 1
|
|
#define CIPSO_V4_MAP_PASS 2
|
|
#define CIPSO_V4_MAP_LOCAL 3
|
|
|
|
/* limits */
|
|
#define CIPSO_V4_MAX_REM_LVLS 255
|
|
#define CIPSO_V4_INV_LVL 0x80000000
|
|
#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
|
|
#define CIPSO_V4_MAX_REM_CATS 65534
|
|
#define CIPSO_V4_INV_CAT 0x80000000
|
|
#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
|
|
|
|
/*
|
|
* CIPSO DOI definitions
|
|
*/
|
|
|
|
/* DOI definition struct */
|
|
#define CIPSO_V4_TAG_MAXCNT 5
|
|
struct cipso_v4_doi {
|
|
u32 doi;
|
|
u32 type;
|
|
union {
|
|
struct cipso_v4_std_map_tbl *std;
|
|
} map;
|
|
u8 tags[CIPSO_V4_TAG_MAXCNT];
|
|
|
|
atomic_t refcount;
|
|
struct list_head list;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
/* Standard CIPSO mapping table */
|
|
/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
|
|
* bit is set then consider that value as unspecified, meaning the
|
|
* mapping for that particular level/category is invalid */
|
|
struct cipso_v4_std_map_tbl {
|
|
struct {
|
|
u32 *cipso;
|
|
u32 *local;
|
|
u32 cipso_size;
|
|
u32 local_size;
|
|
} lvl;
|
|
struct {
|
|
u32 *cipso;
|
|
u32 *local;
|
|
u32 cipso_size;
|
|
u32 local_size;
|
|
} cat;
|
|
};
|
|
|
|
/*
|
|
* Sysctl Variables
|
|
*/
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
extern int cipso_v4_cache_enabled;
|
|
extern int cipso_v4_cache_bucketsize;
|
|
extern int cipso_v4_rbm_optfmt;
|
|
extern int cipso_v4_rbm_strictvalid;
|
|
#endif
|
|
|
|
/*
|
|
* Helper Functions
|
|
*/
|
|
|
|
#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
|
|
#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
|
|
|
|
/*
|
|
* DOI List Functions
|
|
*/
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
|
|
struct netlbl_audit *audit_info);
|
|
void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
|
|
int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
|
|
struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
|
|
void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
|
|
int cipso_v4_doi_walk(u32 *skip_cnt,
|
|
int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
|
|
void *cb_arg);
|
|
#else
|
|
static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline int cipso_v4_doi_remove(u32 doi,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int cipso_v4_doi_walk(u32 *skip_cnt,
|
|
int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
|
|
void *cb_arg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
|
|
const char *domain)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
|
|
const char *domain)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|
|
|
|
/*
|
|
* Label Mapping Cache Functions
|
|
*/
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
void cipso_v4_cache_invalidate(void);
|
|
int cipso_v4_cache_add(const struct sk_buff *skb,
|
|
const struct netlbl_lsm_secattr *secattr);
|
|
#else
|
|
static inline void cipso_v4_cache_invalidate(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline int cipso_v4_cache_add(const struct sk_buff *skb,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|
|
|
|
/*
|
|
* Protocol Handling Functions
|
|
*/
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
|
|
int cipso_v4_sock_setattr(struct sock *sk,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr);
|
|
void cipso_v4_sock_delattr(struct sock *sk);
|
|
int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
|
|
int cipso_v4_req_setattr(struct request_sock *req,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr);
|
|
void cipso_v4_req_delattr(struct request_sock *req);
|
|
int cipso_v4_skbuff_setattr(struct sk_buff *skb,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr);
|
|
int cipso_v4_skbuff_delattr(struct sk_buff *skb);
|
|
int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
|
|
struct netlbl_lsm_secattr *secattr);
|
|
int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
|
|
#else
|
|
static inline void cipso_v4_error(struct sk_buff *skb,
|
|
int error,
|
|
u32 gateway)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline int cipso_v4_sock_setattr(struct sock *sk,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void cipso_v4_sock_delattr(struct sock *sk)
|
|
{
|
|
}
|
|
|
|
static inline int cipso_v4_sock_getattr(struct sock *sk,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int cipso_v4_req_setattr(struct request_sock *req,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void cipso_v4_req_delattr(struct request_sock *req)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
|
|
const struct cipso_v4_doi *doi_def,
|
|
const struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int cipso_v4_validate(const struct sk_buff *skb,
|
|
unsigned char **option)
|
|
{
|
|
unsigned char *opt = *option;
|
|
unsigned char err_offset = 0;
|
|
u8 opt_len = opt[1];
|
|
u8 opt_iter;
|
|
|
|
if (opt_len < 8) {
|
|
err_offset = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (get_unaligned_be32(&opt[2]) == 0) {
|
|
err_offset = 2;
|
|
goto out;
|
|
}
|
|
|
|
for (opt_iter = 6; opt_iter < opt_len;) {
|
|
if (opt[opt_iter + 1] > (opt_len - opt_iter)) {
|
|
err_offset = opt_iter + 1;
|
|
goto out;
|
|
}
|
|
opt_iter += opt[opt_iter + 1];
|
|
}
|
|
|
|
out:
|
|
*option = opt + err_offset;
|
|
return err_offset;
|
|
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|
|
|
|
#endif /* _CIPSO_IPV4_H */
|