mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-30 07:34:12 +08:00
fc1b6d6de2
This commit offers an option to encrypt and authenticate all messaging,
including the neighbor discovery messages. The currently most advanced
algorithm supported is the AEAD AES-GCM (like IPSec or TLS). All
encryption/decryption is done at the bearer layer, just before leaving
or after entering TIPC.
Supported features:
- Encryption & authentication of all TIPC messages (header + data);
- Two symmetric-key modes: Cluster and Per-node;
- Automatic key switching;
- Key-expired revoking (sequence number wrapped);
- Lock-free encryption/decryption (RCU);
- Asynchronous crypto, Intel AES-NI supported;
- Multiple cipher transforms;
- Logs & statistics;
Two key modes:
- Cluster key mode: One single key is used for both TX & RX in all
nodes in the cluster.
- Per-node key mode: Each nodes in the cluster has one specific TX key.
For RX, a node requires its peers' TX key to be able to decrypt the
messages from those peers.
Key setting from user-space is performed via netlink by a user program
(e.g. the iproute2 'tipc' tool).
Internal key state machine:
Attach Align(RX)
+-+ +-+
| V | V
+---------+ Attach +---------+
| IDLE |---------------->| PENDING |(user = 0)
+---------+ +---------+
A A Switch| A
| | | |
| | Free(switch/revoked) | |
(Free)| +----------------------+ | |Timeout
| (TX) | | |(RX)
| | | |
| | v |
+---------+ Switch +---------+
| PASSIVE |<----------------| ACTIVE |
+---------+ (RX) +---------+
(user = 1) (user >= 1)
The number of TFMs is 10 by default and can be changed via the procfs
'net/tipc/max_tfms'. At this moment, as for simplicity, this file is
also used to print the crypto statistics at runtime:
echo 0xfff1 > /proc/sys/net/tipc/max_tfms
The patch defines a new TIPC version (v7) for the encryption message (-
backward compatibility as well). The message is basically encapsulated
as follows:
+----------------------------------------------------------+
| TIPCv7 encryption | Original TIPCv2 | Authentication |
| header | packet (encrypted) | Tag |
+----------------------------------------------------------+
The throughput is about ~40% for small messages (compared with non-
encryption) and ~9% for large messages. With the support from hardware
crypto i.e. the Intel AES-NI CPU instructions, the throughput increases
upto ~85% for small messages and ~55% for large messages.
By default, the new feature is inactive (i.e. no encryption) until user
sets a key for TIPC. There is however also a new option - "TIPC_CRYPTO"
in the kernel configuration to enable/disable the new code when needed.
MAINTAINERS | add two new files 'crypto.h' & 'crypto.c' in tipc
Acked-by: Ying Xue <ying.xue@windreiver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
168 lines
6.4 KiB
C
168 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/**
|
|
* net/tipc/crypto.h: Include file for TIPC crypto
|
|
*
|
|
* Copyright (c) 2019, Ericsson AB
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifdef CONFIG_TIPC_CRYPTO
|
|
#ifndef _TIPC_CRYPTO_H
|
|
#define _TIPC_CRYPTO_H
|
|
|
|
#include "core.h"
|
|
#include "node.h"
|
|
#include "msg.h"
|
|
#include "bearer.h"
|
|
|
|
#define TIPC_EVERSION 7
|
|
|
|
/* AEAD aes(gcm) */
|
|
#define TIPC_AES_GCM_KEY_SIZE_128 16
|
|
#define TIPC_AES_GCM_KEY_SIZE_192 24
|
|
#define TIPC_AES_GCM_KEY_SIZE_256 32
|
|
|
|
#define TIPC_AES_GCM_SALT_SIZE 4
|
|
#define TIPC_AES_GCM_IV_SIZE 12
|
|
#define TIPC_AES_GCM_TAG_SIZE 16
|
|
|
|
/**
|
|
* TIPC crypto modes:
|
|
* - CLUSTER_KEY:
|
|
* One single key is used for both TX & RX in all nodes in the cluster.
|
|
* - PER_NODE_KEY:
|
|
* Each nodes in the cluster has one TX key, for RX a node needs to know
|
|
* its peers' TX key for the decryption of messages from those nodes.
|
|
*/
|
|
enum {
|
|
CLUSTER_KEY = 1,
|
|
PER_NODE_KEY = (1 << 1),
|
|
};
|
|
|
|
extern int sysctl_tipc_max_tfms __read_mostly;
|
|
|
|
/**
|
|
* TIPC encryption message format:
|
|
*
|
|
* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
|
|
* 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* w0:|Ver=7| User |D|TX |RX |K| Rsvd |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* w1:| Seqno |
|
|
* w2:| (8 octets) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* w3:\ Prevnode \
|
|
* / (4 or 16 octets) /
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* \ \
|
|
* / Encrypted complete TIPC V2 header and user data /
|
|
* \ \
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* | AuthTag |
|
|
* | (16 octets) |
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
* Word0:
|
|
* Ver : = 7 i.e. TIPC encryption message version
|
|
* User : = 7 (for LINK_PROTOCOL); = 13 (for LINK_CONFIG) or = 0
|
|
* D : The destined bit i.e. the message's destination node is
|
|
* "known" or not at the message encryption
|
|
* TX : TX key used for the message encryption
|
|
* RX : Currently RX active key corresponding to the destination
|
|
* node's TX key (when the "D" bit is set)
|
|
* K : Keep-alive bit (for RPS, LINK_PROTOCOL/STATE_MSG only)
|
|
* Rsvd : Reserved bit, field
|
|
* Word1-2:
|
|
* Seqno : The 64-bit sequence number of the encrypted message, also
|
|
* part of the nonce used for the message encryption/decryption
|
|
* Word3-:
|
|
* Prevnode: The source node address, or ID in case LINK_CONFIG only
|
|
* AuthTag : The authentication tag for the message integrity checking
|
|
* generated by the message encryption
|
|
*/
|
|
struct tipc_ehdr {
|
|
union {
|
|
struct {
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
__u8 destined:1,
|
|
user:4,
|
|
version:3;
|
|
__u8 reserved_1:3,
|
|
keepalive:1,
|
|
rx_key_active:2,
|
|
tx_key:2;
|
|
#elif defined(__BIG_ENDIAN_BITFIELD)
|
|
__u8 version:3,
|
|
user:4,
|
|
destined:1;
|
|
__u8 tx_key:2,
|
|
rx_key_active:2,
|
|
keepalive:1,
|
|
reserved_1:3;
|
|
#else
|
|
#error "Please fix <asm/byteorder.h>"
|
|
#endif
|
|
__be16 reserved_2;
|
|
} __packed;
|
|
__be32 w0;
|
|
};
|
|
__be64 seqno;
|
|
union {
|
|
__be32 addr;
|
|
__u8 id[NODE_ID_LEN]; /* For a LINK_CONFIG message only! */
|
|
};
|
|
#define EHDR_SIZE (offsetof(struct tipc_ehdr, addr) + sizeof(__be32))
|
|
#define EHDR_CFG_SIZE (sizeof(struct tipc_ehdr))
|
|
#define EHDR_MIN_SIZE (EHDR_SIZE)
|
|
#define EHDR_MAX_SIZE (EHDR_CFG_SIZE)
|
|
#define EMSG_OVERHEAD (EHDR_SIZE + TIPC_AES_GCM_TAG_SIZE)
|
|
} __packed;
|
|
|
|
int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net,
|
|
struct tipc_node *node);
|
|
void tipc_crypto_stop(struct tipc_crypto **crypto);
|
|
void tipc_crypto_timeout(struct tipc_crypto *rx);
|
|
int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,
|
|
struct tipc_bearer *b, struct tipc_media_addr *dst,
|
|
struct tipc_node *__dnode);
|
|
int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx,
|
|
struct sk_buff **skb, struct tipc_bearer *b);
|
|
int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey,
|
|
u8 mode);
|
|
void tipc_crypto_key_flush(struct tipc_crypto *c);
|
|
int tipc_aead_key_validate(struct tipc_aead_key *ukey);
|
|
bool tipc_ehdr_validate(struct sk_buff *skb);
|
|
|
|
#endif /* _TIPC_CRYPTO_H */
|
|
#endif
|