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security: pass asoc to sctp_assoc_request and sctp_sk_clone

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This patch is to move secid and peer_secid from endpoint to association,
and pass asoc to sctp_assoc_request and sctp_sk_clone instead of ep. As
ep is the local endpoint and asoc represents a connection, and in SCTP
one sk/ep could have multiple asoc/connection, saving secid/peer_secid
for new asoc will overwrite the old asoc's.

Note that since asoc can be passed as NULL, security_sctp_assoc_request()
is moved to the place right after the new_asoc is created in
sctp_sf_do_5_1B_init() and sctp_sf_do_unexpected_init().

v1->v2:
  - fix the description of selinux_netlbl_skbuff_setsid(), as Jakub noticed.
  - fix the annotation in selinux_sctp_assoc_request(), as Richard Noticed.

Fixes: 72e89f5008 ("security: Add support for SCTP security hooks")
Reported-by: Prashanth Prahlad <pprahlad@redhat.com>
Reviewed-by: Richard Haines <richard_c_haines@btinternet.com>
Tested-by: Richard Haines <richard_c_haines@btinternet.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2021-11-02 08:02:47 -04:00 • committed by David S. Miller
parent 843c3cbbdf
commit c081d53f97
11 changed files with 76 additions and 77 deletions
Download patch file Download diff file Expand all files Collapse all files

22
security/selinux/hooks.c
View file

@ -5339,10 +5339,10 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
* connect(2), sctp_connectx(3) or sctp_sendmsg(3) (with no association
* already present).
*/
static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
static int selinux_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
struct sk_security_struct *sksec = ep->base.sk->sk_security;
struct sk_security_struct *sksec = asoc->base.sk->sk_security;
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
u8 peerlbl_active;
@ -5359,7 +5359,7 @@ static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
/* This will return peer_sid = SECSID_NULL if there are
* no peer labels, see security_net_peersid_resolve().
*/
err = selinux_skb_peerlbl_sid(skb, ep->base.sk->sk_family,
err = selinux_skb_peerlbl_sid(skb, asoc->base.sk->sk_family,
&peer_sid);
if (err)
return err;
@ -5383,7 +5383,7 @@ static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
*/
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->sk = ep->base.sk;
ad.u.net->sk = asoc->base.sk;
err = avc_has_perm(&selinux_state,
sksec->peer_sid, peer_sid, sksec->sclass,
SCTP_SOCKET__ASSOCIATION, &ad);
@ -5392,7 +5392,7 @@ static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
}
/* Compute the MLS component for the connection and store
* the information in ep. This will be used by SCTP TCP type
* the information in asoc. This will be used by SCTP TCP type
* sockets and peeled off connections as they cause a new
* socket to be generated. selinux_sctp_sk_clone() will then
* plug this into the new socket.
@ -5401,11 +5401,11 @@ static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
if (err)
return err;
ep->secid = conn_sid;
ep->peer_secid = peer_sid;
asoc->secid = conn_sid;
asoc->peer_secid = peer_sid;
/* Set any NetLabel labels including CIPSO/CALIPSO options. */
return selinux_netlbl_sctp_assoc_request(ep, skb);
return selinux_netlbl_sctp_assoc_request(asoc, skb);
}
/* Check if sctp IPv4/IPv6 addresses are valid for binding or connecting
@ -5490,7 +5490,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
}
/* Called whenever a new socket is created by accept(2) or sctp_peeloff(3). */
static void selinux_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
struct sock *newsk)
{
struct sk_security_struct *sksec = sk->sk_security;
@ -5502,8 +5502,8 @@ static void selinux_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
if (!selinux_policycap_extsockclass())
return selinux_sk_clone_security(sk, newsk);
newsksec->sid = ep->secid;
newsksec->peer_sid = ep->peer_secid;
newsksec->sid = asoc->secid;
newsksec->peer_sid = asoc->peer_secid;
newsksec->sclass = sksec->sclass;
selinux_netlbl_sctp_sk_clone(sk, newsk);
}