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[SCTP]: Implement SCTP-AUTH internals

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This patch implements the internals operations of the AUTH, such as
key computation and storage.  It also adds necessary variables to
the SCTP data structures.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich
2007-10-09 01:15:59 -07:00
committed by David S. Miller
parent f7b0e93ba1
commit 1f485649f5
7 changed files with 977 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

112
include/net/sctp/auth.h Normal file
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@@ -0,0 +1,112 @@
/* SCTP kernel reference Implementation
* (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
*
* This file is part of the SCTP kernel reference Implementation
*
* The SCTP reference implementation 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, or (at your option)
* any later version.
*
* The SCTP reference implementation 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 GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Please send any bug reports or fixes you make to the
* email address(es):
* lksctp developers <lksctp-developers@lists.sourceforge.net>
*
* Or submit a bug report through the following website:
* http://www.sf.net/projects/lksctp
*
* Written or modified by:
* Vlad Yasevich <vladislav.yasevich@hp.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#ifndef __sctp_auth_h__
#define __sctp_auth_h__
#include <linux/list.h>
#include <linux/crypto.h>
struct sctp_endpoint;
struct sctp_association;
struct sctp_authkey;
/*
* Define a generic struct that will hold all the info
* necessary for an HMAC transform
*/
struct sctp_hmac {
__u16 hmac_id; /* one of the above ids */
char *hmac_name; /* name for loading */
__u16 hmac_len; /* length of the signature */
};
/* This is generic structure that containst authentication bytes used
* as keying material. It's a what is referred to as byte-vector all
* over SCTP-AUTH
*/
struct sctp_auth_bytes {
atomic_t refcnt;
__u32 len;
__u8 data[];
};
/* Definition for a shared key, weather endpoint or association */
struct sctp_shared_key {
struct list_head key_list;
__u16 key_id;
struct sctp_auth_bytes *key;
};
#define key_for_each(__key, __list_head) \
list_for_each_entry(__key, __list_head, key_list)
#define key_for_each_safe(__key, __tmp, __list_head) \
list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
{
if (!key)
return;
atomic_inc(&key->refcnt);
}
void sctp_auth_key_put(struct sctp_auth_bytes *key);
struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
void sctp_auth_shkey_free(struct sctp_shared_key *sh_key);
void sctp_auth_destroy_keys(struct list_head *keys);
int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
struct sctp_shared_key *sctp_auth_get_shkey(
const struct sctp_association *asoc,
__u16 key_id);
int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
struct sctp_association *asoc,
gfp_t gfp);
int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
void sctp_auth_destroy_hmacs(struct crypto_hash *auth_hmacs[]);
struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
struct sctp_hmac_algo_param *hmacs);
int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
__u16 hmac_id);
int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
struct sk_buff *skb,
struct sctp_auth_chunk *auth, gfp_t gfp);
#endif

49
include/net/sctp/constants.h
View File

@@ -64,12 +64,18 @@ enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
#define SCTP_CID_MAX SCTP_CID_ASCONF_ACK
#define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1)
#define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNKTYPES + 2)
#define SCTP_NUM_ADDIP_CHUNK_TYPES 2
#define SCTP_NUM_PRSCTP_CHUNK_TYPES 1
#define SCTP_NUM_AUTH_CHUNK_TYPES 1
#define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \
SCTP_NUM_ADDIP_CHUNK_TYPES +\
SCTP_NUM_PRSCTP_CHUNK_TYPES +\
SCTP_NUM_AUTH_CHUNK_TYPES)
/* These are the different flavours of event. */
typedef enum {
@@ -409,4 +415,45 @@ typedef enum {
SCTP_LOWER_CWND_INACTIVE,
} sctp_lower_cwnd_t;
/* SCTP-AUTH Necessary constants */
/* SCTP-AUTH, Section 3.3
*
* The following Table 2 shows the currently defined values for HMAC
* identifiers.
*
* +-----------------+--------------------------+
* | HMAC Identifier | Message Digest Algorithm |
* +-----------------+--------------------------+
* | 0 | Reserved |
* | 1 | SHA-1 defined in [8] |
* | 2 | Reserved |
* | 3 | SHA-256 defined in [8] |
* +-----------------+--------------------------+
*/
enum {
SCTP_AUTH_HMAC_ID_RESERVED_0,
SCTP_AUTH_HMAC_ID_SHA1,
SCTP_AUTH_HMAC_ID_RESERVED_2,
SCTP_AUTH_HMAC_ID_SHA256
};
#define SCTP_AUTH_HMAC_ID_MAX SCTP_AUTH_HMAC_ID_SHA256
#define SCTP_AUTH_NUM_HMACS (SCTP_AUTH_HMAC_ID_SHA256 + 1)
#define SCTP_SHA1_SIG_SIZE 20
#define SCTP_SHA256_SIG_SIZE 32
/* SCTP-AUTH, Section 3.2
* The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
* MUST NOT be listed in the CHUNKS parameter
*/
#define SCTP_NUM_NOAUTH_CHUNKS 4
#define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
/* SCTP-AUTH Section 6.1
* The RANDOM parameter MUST contain a 32 byte random number.
*/
#define SCTP_AUTH_RANDOM_LENGTH 32
#endif /* __sctp_constants_h__ */

1
include/net/sctp/sctp.h
View File

@@ -341,6 +341,7 @@ extern atomic_t sctp_dbg_objcnt_bind_bucket;
extern atomic_t sctp_dbg_objcnt_addr;
extern atomic_t sctp_dbg_objcnt_ssnmap;
extern atomic_t sctp_dbg_objcnt_datamsg;
extern atomic_t sctp_dbg_objcnt_keys;
/* Macros to atomically increment/decrement objcnt counters. */
#define SCTP_DBG_OBJCNT_INC(name) \

73
include/net/sctp/structs.h
View File

@@ -64,6 +64,7 @@
#include <linux/skbuff.h> /* We need sk_buff_head. */
#include <linux/workqueue.h> /* We need tq_struct. */
#include <linux/sctp.h> /* We need sctp* header structs. */
#include <net/sctp/auth.h> /* We need auth specific structs */
/* A convenience structure for handling sockaddr structures.
* We should wean ourselves off this.
@@ -216,6 +217,9 @@ extern struct sctp_globals {
/* Flag to indicate if PR-SCTP is enabled. */
int prsctp_enable;
/* Flag to idicate if SCTP-AUTH is enabled */
int auth_enable;
} sctp_globals;
#define sctp_rto_initial (sctp_globals.rto_initial)
@@ -248,6 +252,7 @@ extern struct sctp_globals {
#define sctp_local_addr_lock (sctp_globals.addr_list_lock)
#define sctp_addip_enable (sctp_globals.addip_enable)
#define sctp_prsctp_enable (sctp_globals.prsctp_enable)
#define sctp_auth_enable (sctp_globals.auth_enable)
/* SCTP Socket type: UDP or TCP style. */
typedef enum {
@@ -397,6 +402,9 @@ struct sctp_cookie {
__u32 adaptation_ind;
__u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
__u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2];
__u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
/* This is a shim for my peer's INIT packet, followed by
* a copy of the raw address list of the association.
@@ -441,6 +449,9 @@ union sctp_params {
union sctp_addr_param *addr;
struct sctp_adaptation_ind_param *aind;
struct sctp_supported_ext_param *ext;
struct sctp_random_param *random;
struct sctp_chunks_param *chunks;
struct sctp_hmac_algo_param *hmac_algo;
};
/* RFC 2960. Section 3.3.5 Heartbeat.
@@ -679,6 +690,7 @@ struct sctp_chunk {
struct sctp_errhdr *err_hdr;
struct sctp_addiphdr *addip_hdr;
struct sctp_fwdtsn_hdr *fwdtsn_hdr;
struct sctp_authhdr *auth_hdr;
} subh;
__u8 *chunk_end;
@@ -724,6 +736,7 @@ struct sctp_chunk {
__s8 fast_retransmit; /* Is this chunk fast retransmitted? */
__u8 tsn_missing_report; /* Data chunk missing counter. */
__u8 data_accepted; /* At least 1 chunk in this packet accepted */
__u8 auth; /* IN: was auth'ed | OUT: needs auth */
};
void sctp_chunk_hold(struct sctp_chunk *);
@@ -773,16 +786,22 @@ struct sctp_packet {
*/
struct sctp_transport *transport;
/* This packet contains a COOKIE-ECHO chunk. */
char has_cookie_echo;
/* pointer to the auth chunk for this packet */
struct sctp_chunk *auth;
/* This packet containsa SACK chunk. */
char has_sack;
/* This packet contains a COOKIE-ECHO chunk. */
__u8 has_cookie_echo;
/* This packet contains a SACK chunk. */
__u8 has_sack;
/* This packet contains an AUTH chunk */
__u8 has_auth;
/* SCTP cannot fragment this packet. So let ip fragment it. */
char ipfragok;
__u8 ipfragok;
int malloced;
__u8 malloced;
};
struct sctp_packet *sctp_packet_init(struct sctp_packet *,
@@ -1291,6 +1310,21 @@ struct sctp_endpoint {
/* rcvbuf acct. policy. */
__u32 rcvbuf_policy;
/* SCTP AUTH: array of the HMACs that will be allocated
* we need this per association so that we don't serialize
*/
struct crypto_hash **auth_hmacs;
/* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
struct sctp_hmac_algo_param *auth_hmacs_list;
/* SCTP-AUTH: chunks to authenticate encoded into parameter */
struct sctp_chunks_param *auth_chunk_list;
/* SCTP-AUTH: endpoint shared keys */
struct list_head endpoint_shared_keys;
__u16 active_key_id;
};
/* Recover the outter endpoint structure. */
@@ -1497,6 +1531,7 @@ struct sctp_association {
__u8 hostname_address;/* Peer understands DNS addresses? */
__u8 asconf_capable; /* Does peer support ADDIP? */
__u8 prsctp_capable; /* Can peer do PR-SCTP? */
__u8 auth_capable; /* Is peer doing SCTP-AUTH? */
__u32 adaptation_ind; /* Adaptation Code point. */
@@ -1514,6 +1549,14 @@ struct sctp_association {
* Initial TSN Value minus 1
*/
__u32 addip_serial;
/* SCTP-AUTH: We need to know pears random number, hmac list
* and authenticated chunk list. All that is part of the
* cookie and these are just pointers to those locations
*/
sctp_random_param_t *peer_random;
sctp_chunks_param_t *peer_chunks;
sctp_hmac_algo_param_t *peer_hmacs;
} peer;
/* State : A state variable indicating what state the
@@ -1797,6 +1840,24 @@ struct sctp_association {
*/
__u32 addip_serial;
/* SCTP AUTH: list of the endpoint shared keys. These
* keys are provided out of band by the user applicaton
* and can't change during the lifetime of the association
*/
struct list_head endpoint_shared_keys;
/* SCTP AUTH:
* The current generated assocaition shared key (secret)
*/
struct sctp_auth_bytes *asoc_shared_key;
/* SCTP AUTH: hmac id of the first peer requested algorithm
* that we support.
*/
__u16 default_hmac_id;
__u16 active_key_id;
/* Need to send an ECNE Chunk? */
char need_ecne;