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sctp: add sockopt SCTP_AUTH_DEACTIVATE_KEY

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This patch is to add sockopt SCTP_AUTH_DEACTIVATE_KEY, as described in
section 8.3.4 of RFC6458.

This set option indicates that the application will no longer send user
messages using the indicated key identifier.

Note that RFC requires that only deactivated keys that are no longer used
by an association can be deleted, but for the backward compatibility, it
is not to check deactivated when deleting or replacing one sh_key.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2018-03-14 19:05:32 +08:00
committed by David S. Miller
parent 3ff547c06a
commit 601590ec15
4 changed files with 81 additions and 9 deletions
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46
net/sctp/auth.c
View File

@@ -449,8 +449,11 @@ struct sctp_shared_key *sctp_auth_get_shkey(
/* First search associations set of endpoint pair shared keys */
key_for_each(key, &asoc->endpoint_shared_keys) {
if (key->key_id == key_id)
return key;
if (key->key_id == key_id) {
if (!key->deactivated)
return key;
break;
}
}
return NULL;
@@ -905,7 +908,7 @@ int sctp_auth_set_active_key(struct sctp_endpoint *ep,
}
}
if (!found)
if (!found || key->deactivated)
return -EINVAL;
if (asoc) {
@@ -956,3 +959,40 @@ int sctp_auth_del_key_id(struct sctp_endpoint *ep,
return 0;
}
int sctp_auth_deact_key_id(struct sctp_endpoint *ep,
struct sctp_association *asoc, __u16 key_id)
{
struct sctp_shared_key *key;
struct list_head *sh_keys;
int found = 0;
/* The key identifier MUST NOT be the current active key
* The key identifier MUST correst to an existing key
*/
if (asoc) {
if (asoc->active_key_id == key_id)
return -EINVAL;
sh_keys = &asoc->endpoint_shared_keys;
} else {
if (ep->active_key_id == key_id)
return -EINVAL;
sh_keys = &ep->endpoint_shared_keys;
}
key_for_each(key, sh_keys) {
if (key->key_id == key_id) {
found = 1;
break;
}
}
if (!found)
return -EINVAL;
key->deactivated = 1;
return 0;
}

31
net/sctp/socket.c
View File

@@ -3646,6 +3646,33 @@ static int sctp_setsockopt_del_key(struct sock *sk,
}
/*
* 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
*
* This set option will deactivate a shared secret key.
*/
static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
unsigned int optlen)
{
struct sctp_endpoint *ep = sctp_sk(sk)->ep;
struct sctp_authkeyid val;
struct sctp_association *asoc;
if (!ep->auth_enable)
return -EACCES;
if (optlen != sizeof(struct sctp_authkeyid))
return -EINVAL;
if (copy_from_user(&val, optval, optlen))
return -EFAULT;
asoc = sctp_id2assoc(sk, val.scact_assoc_id);
if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
return -EINVAL;
return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
}
/*
* 8.1.23 SCTP_AUTO_ASCONF
*
@@ -4238,6 +4265,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_AUTH_DELETE_KEY:
retval = sctp_setsockopt_del_key(sk, optval, optlen);
break;
case SCTP_AUTH_DEACTIVATE_KEY:
retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
break;
case SCTP_AUTO_ASCONF:
retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
break;
@@ -7212,6 +7242,7 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
case SCTP_AUTH_KEY:
case SCTP_AUTH_CHUNK:
case SCTP_AUTH_DELETE_KEY:
case SCTP_AUTH_DEACTIVATE_KEY:
retval = -EOPNOTSUPP;
break;
case SCTP_HMAC_IDENT: