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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
Documentation/security/SCTP.rst
View File

@ -26,11 +26,11 @@ described in the `SCTP SELinux Support`_ chapter.
security_sctp_assoc_request()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Passes the ``@ep`` and ``@chunk->skb`` of the association INIT packet to the
Passes the ``@asoc`` and ``@chunk->skb`` of the association INIT packet to the
security module. Returns 0 on success, error on failure.
::
@ep - pointer to sctp endpoint structure.
@asoc - pointer to sctp association structure.
@skb - pointer to skbuff of association packet.
@ -117,9 +117,9 @@ Called whenever a new socket is created by **accept**\(2)
calls **sctp_peeloff**\(3).
::
@ep - pointer to current sctp endpoint structure.
@asoc - pointer to current sctp association structure.
@sk - pointer to current sock structure.
@sk - pointer to new sock structure.
@newsk - pointer to new sock structure.
security_inet_conn_established()
@ -200,22 +200,22 @@ hooks with the SELinux specifics expanded below::
security_sctp_assoc_request()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Passes the ``@ep`` and ``@chunk->skb`` of the association INIT packet to the
Passes the ``@asoc`` and ``@chunk->skb`` of the association INIT packet to the
security module. Returns 0 on success, error on failure.
::
@ep - pointer to sctp endpoint structure.
@asoc - pointer to sctp association structure.
@skb - pointer to skbuff of association packet.
The security module performs the following operations:
IF this is the first association on ``@ep->base.sk``, then set the peer
IF this is the first association on ``@asoc->base.sk``, then set the peer
sid to that in ``@skb``. This will ensure there is only one peer sid
assigned to ``@ep->base.sk`` that may support multiple associations.
assigned to ``@asoc->base.sk`` that may support multiple associations.
ELSE validate the ``@ep->base.sk peer_sid`` against the ``@skb peer sid``
ELSE validate the ``@asoc->base.sk peer_sid`` against the ``@skb peer sid``
to determine whether the association should be allowed or denied.
Set the sctp ``@ep sid`` to socket's sid (from ``ep->base.sk``) with
Set the sctp ``@asoc sid`` to socket's sid (from ``asoc->base.sk``) with
MLS portion taken from ``@skb peer sid``. This will be used by SCTP
TCP style sockets and peeled off connections as they cause a new socket
to be generated.
@ -259,13 +259,13 @@ security_sctp_sk_clone()
Called whenever a new socket is created by **accept**\(2) (i.e. a TCP style
socket) or when a socket is 'peeled off' e.g userspace calls
**sctp_peeloff**\(3). ``security_sctp_sk_clone()`` will set the new
sockets sid and peer sid to that contained in the ``@ep sid`` and
``@ep peer sid`` respectively.
sockets sid and peer sid to that contained in the ``@asoc sid`` and
``@asoc peer sid`` respectively.
::
@ep - pointer to current sctp endpoint structure.
@asoc - pointer to current sctp association structure.
@sk - pointer to current sock structure.
@sk - pointer to new sock structure.
@newsk - pointer to new sock structure.
security_inet_conn_established()

4
include/linux/lsm_hook_defs.h
View File

@ -329,11 +329,11 @@ LSM_HOOK(int, 0, tun_dev_create, void)
LSM_HOOK(int, 0, tun_dev_attach_queue, void *security)
LSM_HOOK(int, 0, tun_dev_attach, struct sock *sk, void *security)
LSM_HOOK(int, 0, tun_dev_open, void *security)
LSM_HOOK(int, 0, sctp_assoc_request, struct sctp_endpoint *ep,
LSM_HOOK(int, 0, sctp_assoc_request, struct sctp_association *asoc,
struct sk_buff *skb)
LSM_HOOK(int, 0, sctp_bind_connect, struct sock *sk, int optname,
struct sockaddr *address, int addrlen)
LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_endpoint *ep,
LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_association *asoc,
struct sock *sk, struct sock *newsk)
#endif /* CONFIG_SECURITY_NETWORK */

8
include/linux/lsm_hooks.h
View File

@ -1027,9 +1027,9 @@
* Security hooks for SCTP
*
* @sctp_assoc_request:
* Passes the @ep and @chunk->skb of the association INIT packet to
* Passes the @asoc and @chunk->skb of the association INIT packet to
* the security module.
* @ep pointer to sctp endpoint structure.
* @asoc pointer to sctp association structure.
* @skb pointer to skbuff of association packet.
* Return 0 on success, error on failure.
* @sctp_bind_connect:
@ -1047,9 +1047,9 @@
* Called whenever a new socket is created by accept(2) (i.e. a TCP
* style socket) or when a socket is 'peeled off' e.g userspace
* calls sctp_peeloff(3).
* @ep pointer to current sctp endpoint structure.
* @asoc pointer to current sctp association structure.
* @sk pointer to current sock structure.
* @sk pointer to new sock structure.
* @newsk pointer to new sock structure.
*
* Security hooks for Infiniband
*

10
include/linux/security.h
View File

@ -179,7 +179,7 @@ struct xfrm_policy;
struct xfrm_state;
struct xfrm_user_sec_ctx;
struct seq_file;
struct sctp_endpoint;
struct sctp_association;
#ifdef CONFIG_MMU
extern unsigned long mmap_min_addr;
@ -1425,10 +1425,10 @@ int security_tun_dev_create(void);
int security_tun_dev_attach_queue(void *security);
int security_tun_dev_attach(struct sock *sk, void *security);
int security_tun_dev_open(void *security);
int security_sctp_assoc_request(struct sctp_endpoint *ep, struct sk_buff *skb);
int security_sctp_assoc_request(struct sctp_association *asoc, struct sk_buff *skb);
int security_sctp_bind_connect(struct sock *sk, int optname,
struct sockaddr *address, int addrlen);
void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
struct sock *newsk);
#else /* CONFIG_SECURITY_NETWORK */
@ -1631,7 +1631,7 @@ static inline int security_tun_dev_open(void *security)
return 0;
}
static inline int security_sctp_assoc_request(struct sctp_endpoint *ep,
static inline int security_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
return 0;
@ -1644,7 +1644,7 @@ static inline int security_sctp_bind_connect(struct sock *sk, int optname,
return 0;
}
static inline void security_sctp_sk_clone(struct sctp_endpoint *ep,
static inline void security_sctp_sk_clone(struct sctp_association *asoc,
struct sock *sk,
struct sock *newsk)
{

20
include/net/sctp/structs.h
View File

@ -1355,16 +1355,6 @@ struct sctp_endpoint {
reconf_enable:1;
__u8 strreset_enable;
/* Security identifiers from incoming (INIT). These are set by
* security_sctp_assoc_request(). These will only be used by
* SCTP TCP type sockets and peeled off connections as they
* cause a new socket to be generated. security_sctp_sk_clone()
* will then plug these into the new socket.
*/
u32 secid;
u32 peer_secid;
};
/* Recover the outter endpoint structure. */
@ -2104,6 +2094,16 @@ struct sctp_association {
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
/* Security identifiers from incoming (INIT). These are set by
* security_sctp_assoc_request(). These will only be used by
* SCTP TCP type sockets and peeled off connections as they
* cause a new socket to be generated. security_sctp_sk_clone()
* will then plug these into the new socket.
*/
u32 secid;
u32 peer_secid;
struct rcu_head rcu;
};

26
net/sctp/sm_statefuns.c
View File

@ -326,11 +326,6 @@ enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net,
struct sctp_packet *packet;
int len;
/* Update socket peer label if first association. */
if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
chunk->skb))
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
/* 6.10 Bundling
* An endpoint MUST NOT bundle INIT, INIT ACK or
* SHUTDOWN COMPLETE with any other chunks.
@ -415,6 +410,12 @@ enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net,
if (!new_asoc)
goto nomem;
/* Update socket peer label if first association. */
if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
sctp_association_free(new_asoc);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
}
if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
sctp_scope(sctp_source(chunk)),
GFP_ATOMIC) < 0)
@ -780,7 +781,6 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
}
}
/* Delay state machine commands until later.
*
* Re-build the bind address for the association is done in
@ -1517,11 +1517,6 @@ static enum sctp_disposition sctp_sf_do_unexpected_init(
struct sctp_packet *packet;
int len;
/* Update socket peer label if first association. */
if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
chunk->skb))
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
/* 6.10 Bundling
* An endpoint MUST NOT bundle INIT, INIT ACK or
* SHUTDOWN COMPLETE with any other chunks.
@ -1594,6 +1589,12 @@ static enum sctp_disposition sctp_sf_do_unexpected_init(
if (!new_asoc)
goto nomem;
/* Update socket peer label if first association. */
if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
sctp_association_free(new_asoc);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
}
if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0)
goto nomem;
@ -2255,8 +2256,7 @@ enum sctp_disposition sctp_sf_do_5_2_4_dupcook(
}
/* Update socket peer label if first association. */
if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
chunk->skb)) {
if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
sctp_association_free(new_asoc);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
}

5
net/sctp/socket.c
View File

@ -9412,7 +9412,6 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
struct inet_sock *inet = inet_sk(sk);
struct inet_sock *newinet;
struct sctp_sock *sp = sctp_sk(sk);
struct sctp_endpoint *ep = sp->ep;
newsk->sk_type = sk->sk_type;
newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
@ -9457,9 +9456,9 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
net_enable_timestamp();
/* Set newsk security attributes from original sk and connection
* security attribute from ep.
* security attribute from asoc.
*/
security_sctp_sk_clone(ep, sk, newsk);
security_sctp_sk_clone(asoc, sk, newsk);
}
static inline void sctp_copy_descendant(struct sock *sk_to,

8
security/security.c
View File

@ -2367,9 +2367,9 @@ int security_tun_dev_open(void *security)
}
EXPORT_SYMBOL(security_tun_dev_open);
int security_sctp_assoc_request(struct sctp_endpoint *ep, struct sk_buff *skb)
int security_sctp_assoc_request(struct sctp_association *asoc, struct sk_buff *skb)
{
return call_int_hook(sctp_assoc_request, 0, ep, skb);
return call_int_hook(sctp_assoc_request, 0, asoc, skb);
}
EXPORT_SYMBOL(security_sctp_assoc_request);
@ -2381,10 +2381,10 @@ int security_sctp_bind_connect(struct sock *sk, int optname,
}
EXPORT_SYMBOL(security_sctp_bind_connect);
void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
struct sock *newsk)
{
call_void_hook(sctp_sk_clone, ep, sk, newsk);
call_void_hook(sctp_sk_clone, asoc, sk, newsk);
}
EXPORT_SYMBOL(security_sctp_sk_clone);

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);
}

4
security/selinux/include/netlabel.h
View File

@ -39,7 +39,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
u16 family,
u32 sid);
int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb);
int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family);
void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family);
@ -98,7 +98,7 @@ static inline int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
return 0;
}
static inline int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
static inline int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
return 0;

18
security/selinux/netlabel.c
View File

@ -261,30 +261,30 @@ skbuff_setsid_return:
/**
* selinux_netlbl_sctp_assoc_request - Label an incoming sctp association.
* @ep: incoming association endpoint.
* @asoc: incoming association.
* @skb: the packet.
*
* Description:
* A new incoming connection is represented by @ep, ......
* A new incoming connection is represented by @asoc, ......
* Returns zero on success, negative values on failure.
*
*/
int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
int rc;
struct netlbl_lsm_secattr secattr;
struct sk_security_struct *sksec = ep->base.sk->sk_security;
struct sk_security_struct *sksec = asoc->base.sk->sk_security;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
if (ep->base.sk->sk_family != PF_INET &&
ep->base.sk->sk_family != PF_INET6)
if (asoc->base.sk->sk_family != PF_INET &&
asoc->base.sk->sk_family != PF_INET6)
return 0;
netlbl_secattr_init(&secattr);
rc = security_netlbl_sid_to_secattr(&selinux_state,
ep->secid, &secattr);
asoc->secid, &secattr);
if (rc != 0)
goto assoc_request_return;
@ -294,11 +294,11 @@ int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
if (ip_hdr(skb)->version == 4) {
addr4.sin_family = AF_INET;
addr4.sin_addr.s_addr = ip_hdr(skb)->saddr;
rc = netlbl_conn_setattr(ep->base.sk, (void *)&addr4, &secattr);
rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr4, &secattr);
} else if (IS_ENABLED(CONFIG_IPV6) && ip_hdr(skb)->version == 6) {
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = ipv6_hdr(skb)->saddr;
rc = netlbl_conn_setattr(ep->base.sk, (void *)&addr6, &secattr);
rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr6, &secattr);
} else {
rc = -EAFNOSUPPORT;
}