security: Add support for SCTP security hooks
The SCTP security hooks are explained in: Documentation/security/LSM-sctp.rst Signed-off-by: Richard Haines <richard_c_haines@btinternet.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Haines
Paul Moore
Родитель
213d7f9477
Коммит
72e89f5008
|
|
@ -0,0 +1,175 @@
|
|||
SCTP LSM Support
|
||||
================
|
||||
|
||||
For security module support, three SCTP specific hooks have been implemented::
|
||||
|
||||
security_sctp_assoc_request()
|
||||
security_sctp_bind_connect()
|
||||
security_sctp_sk_clone()
|
||||
|
||||
Also the following security hook has been utilised::
|
||||
|
||||
security_inet_conn_established()
|
||||
|
||||
The usage of these hooks are described below with the SELinux implementation
|
||||
described in ``Documentation/security/SELinux-sctp.rst``
|
||||
|
||||
|
||||
security_sctp_assoc_request()
|
||||
-----------------------------
|
||||
Passes the ``@ep`` 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.
|
||||
@skb - pointer to skbuff of association packet.
|
||||
|
||||
|
||||
security_sctp_bind_connect()
|
||||
-----------------------------
|
||||
Passes one or more ipv4/ipv6 addresses to the security module for validation
|
||||
based on the ``@optname`` that will result in either a bind or connect
|
||||
service as shown in the permission check tables below.
|
||||
Returns 0 on success, error on failure.
|
||||
::
|
||||
|
||||
@sk - Pointer to sock structure.
|
||||
@optname - Name of the option to validate.
|
||||
@address - One or more ipv4 / ipv6 addresses.
|
||||
@addrlen - The total length of address(s). This is calculated on each
|
||||
ipv4 or ipv6 address using sizeof(struct sockaddr_in) or
|
||||
sizeof(struct sockaddr_in6).
|
||||
|
||||
------------------------------------------------------------------
|
||||
| BIND Type Checks |
|
||||
| @optname | @address contains |
|
||||
|----------------------------|-----------------------------------|
|
||||
| SCTP_SOCKOPT_BINDX_ADD | One or more ipv4 / ipv6 addresses |
|
||||
| SCTP_PRIMARY_ADDR | Single ipv4 or ipv6 address |
|
||||
| SCTP_SET_PEER_PRIMARY_ADDR | Single ipv4 or ipv6 address |
|
||||
------------------------------------------------------------------
|
||||
|
||||
------------------------------------------------------------------
|
||||
| CONNECT Type Checks |
|
||||
| @optname | @address contains |
|
||||
|----------------------------|-----------------------------------|
|
||||
| SCTP_SOCKOPT_CONNECTX | One or more ipv4 / ipv6 addresses |
|
||||
| SCTP_PARAM_ADD_IP | One or more ipv4 / ipv6 addresses |
|
||||
| SCTP_SENDMSG_CONNECT | Single ipv4 or ipv6 address |
|
||||
| SCTP_PARAM_SET_PRIMARY | Single ipv4 or ipv6 address |
|
||||
------------------------------------------------------------------
|
||||
|
||||
A summary of the ``@optname`` entries is as follows::
|
||||
|
||||
SCTP_SOCKOPT_BINDX_ADD - Allows additional bind addresses to be
|
||||
associated after (optionally) calling
|
||||
bind(3).
|
||||
sctp_bindx(3) adds a set of bind
|
||||
addresses on a socket.
|
||||
|
||||
SCTP_SOCKOPT_CONNECTX - Allows the allocation of multiple
|
||||
addresses for reaching a peer
|
||||
(multi-homed).
|
||||
sctp_connectx(3) initiates a connection
|
||||
on an SCTP socket using multiple
|
||||
destination addresses.
|
||||
|
||||
SCTP_SENDMSG_CONNECT - Initiate a connection that is generated by a
|
||||
sendmsg(2) or sctp_sendmsg(3) on a new asociation.
|
||||
|
||||
SCTP_PRIMARY_ADDR - Set local primary address.
|
||||
|
||||
SCTP_SET_PEER_PRIMARY_ADDR - Request peer sets address as
|
||||
association primary.
|
||||
|
||||
SCTP_PARAM_ADD_IP - These are used when Dynamic Address
|
||||
SCTP_PARAM_SET_PRIMARY - Reconfiguration is enabled as explained below.
|
||||
|
||||
|
||||
To support Dynamic Address Reconfiguration the following parameters must be
|
||||
enabled on both endpoints (or use the appropriate **setsockopt**\(2))::
|
||||
|
||||
/proc/sys/net/sctp/addip_enable
|
||||
/proc/sys/net/sctp/addip_noauth_enable
|
||||
|
||||
then the following *_PARAM_*'s are sent to the peer in an
|
||||
ASCONF chunk when the corresponding ``@optname``'s are present::
|
||||
|
||||
@optname ASCONF Parameter
|
||||
---------- ------------------
|
||||
SCTP_SOCKOPT_BINDX_ADD -> SCTP_PARAM_ADD_IP
|
||||
SCTP_SET_PEER_PRIMARY_ADDR -> SCTP_PARAM_SET_PRIMARY
|
||||
|
||||
|
||||
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).
|
||||
::
|
||||
|
||||
@ep - pointer to current sctp endpoint structure.
|
||||
@sk - pointer to current sock structure.
|
||||
@sk - pointer to new sock structure.
|
||||
|
||||
|
||||
security_inet_conn_established()
|
||||
---------------------------------
|
||||
Called when a COOKIE ACK is received::
|
||||
|
||||
@sk - pointer to sock structure.
|
||||
@skb - pointer to skbuff of the COOKIE ACK packet.
|
||||
|
||||
|
||||
Security Hooks used for Association Establishment
|
||||
=================================================
|
||||
The following diagram shows the use of ``security_sctp_bind_connect()``,
|
||||
``security_sctp_assoc_request()``, ``security_inet_conn_established()`` when
|
||||
establishing an association.
|
||||
::
|
||||
|
||||
SCTP endpoint "A" SCTP endpoint "Z"
|
||||
================= =================
|
||||
sctp_sf_do_prm_asoc()
|
||||
Association setup can be initiated
|
||||
by a connect(2), sctp_connectx(3),
|
||||
sendmsg(2) or sctp_sendmsg(3).
|
||||
These will result in a call to
|
||||
security_sctp_bind_connect() to
|
||||
initiate an association to
|
||||
SCTP peer endpoint "Z".
|
||||
INIT --------------------------------------------->
|
||||
sctp_sf_do_5_1B_init()
|
||||
Respond to an INIT chunk.
|
||||
SCTP peer endpoint "A" is
|
||||
asking for an association. Call
|
||||
security_sctp_assoc_request()
|
||||
to set the peer label if first
|
||||
association.
|
||||
If not first association, check
|
||||
whether allowed, IF so send:
|
||||
<----------------------------------------------- INIT ACK
|
||||
| ELSE audit event and silently
|
||||
| discard the packet.
|
||||
|
|
||||
COOKIE ECHO ------------------------------------------>
|
||||
|
|
||||
|
|
||||
|
|
||||
<------------------------------------------- COOKIE ACK
|
||||
| |
|
||||
sctp_sf_do_5_1E_ca |
|
||||
Call security_inet_conn_established() |
|
||||
to set the peer label. |
|
||||
| |
|
||||
| If SCTP_SOCKET_TCP or peeled off
|
||||
| socket security_sctp_sk_clone() is
|
||||
| called to clone the new socket.
|
||||
| |
|
||||
ESTABLISHED ESTABLISHED
|
||||
| |
|
||||
------------------------------------------------------------------
|
||||
| Association Established |
|
||||
------------------------------------------------------------------
|
||||
|
||||
|
||||
|
|
@ -906,6 +906,33 @@
|
|||
* associated with the TUN device's security structure.
|
||||
* @security pointer to the TUN devices's security structure.
|
||||
*
|
||||
* Security hooks for SCTP
|
||||
*
|
||||
* @sctp_assoc_request:
|
||||
* Passes the @ep and @chunk->skb of the association INIT packet to
|
||||
* the security module.
|
||||
* @ep pointer to sctp endpoint structure.
|
||||
* @skb pointer to skbuff of association packet.
|
||||
* Return 0 on success, error on failure.
|
||||
* @sctp_bind_connect:
|
||||
* Validiate permissions required for each address associated with sock
|
||||
* @sk. Depending on @optname, the addresses will be treated as either
|
||||
* for a connect or bind service. The @addrlen is calculated on each
|
||||
* ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
|
||||
* sizeof(struct sockaddr_in6).
|
||||
* @sk pointer to sock structure.
|
||||
* @optname name of the option to validate.
|
||||
* @address list containing one or more ipv4/ipv6 addresses.
|
||||
* @addrlen total length of address(s).
|
||||
* Return 0 on success, error on failure.
|
||||
* @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).
|
||||
* @ep pointer to current sctp endpoint structure.
|
||||
* @sk pointer to current sock structure.
|
||||
* @sk pointer to new sock structure.
|
||||
*
|
||||
* Security hooks for Infiniband
|
||||
*
|
||||
* @ib_pkey_access:
|
||||
|
|
@ -1665,6 +1692,12 @@ union security_list_options {
|
|||
int (*tun_dev_attach_queue)(void *security);
|
||||
int (*tun_dev_attach)(struct sock *sk, void *security);
|
||||
int (*tun_dev_open)(void *security);
|
||||
int (*sctp_assoc_request)(struct sctp_endpoint *ep,
|
||||
struct sk_buff *skb);
|
||||
int (*sctp_bind_connect)(struct sock *sk, int optname,
|
||||
struct sockaddr *address, int addrlen);
|
||||
void (*sctp_sk_clone)(struct sctp_endpoint *ep, struct sock *sk,
|
||||
struct sock *newsk);
|
||||
#endif /* CONFIG_SECURITY_NETWORK */
|
||||
|
||||
#ifdef CONFIG_SECURITY_INFINIBAND
|
||||
|
|
@ -1914,6 +1947,9 @@ struct security_hook_heads {
|
|||
struct list_head tun_dev_attach_queue;
|
||||
struct list_head tun_dev_attach;
|
||||
struct list_head tun_dev_open;
|
||||
struct list_head sctp_assoc_request;
|
||||
struct list_head sctp_bind_connect;
|
||||
struct list_head sctp_sk_clone;
|
||||
#endif /* CONFIG_SECURITY_NETWORK */
|
||||
#ifdef CONFIG_SECURITY_INFINIBAND
|
||||
struct list_head ib_pkey_access;
|
||||
|
|
|
|||
|
|
@ -115,6 +115,7 @@ struct xfrm_policy;
|
|||
struct xfrm_state;
|
||||
struct xfrm_user_sec_ctx;
|
||||
struct seq_file;
|
||||
struct sctp_endpoint;
|
||||
|
||||
#ifdef CONFIG_MMU
|
||||
extern unsigned long mmap_min_addr;
|
||||
|
|
@ -1229,6 +1230,11 @@ 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_bind_connect(struct sock *sk, int optname,
|
||||
struct sockaddr *address, int addrlen);
|
||||
void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
|
||||
struct sock *newsk);
|
||||
|
||||
#else /* CONFIG_SECURITY_NETWORK */
|
||||
static inline int security_unix_stream_connect(struct sock *sock,
|
||||
|
|
@ -1421,6 +1427,25 @@ static inline int security_tun_dev_open(void *security)
|
|||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int security_sctp_assoc_request(struct sctp_endpoint *ep,
|
||||
struct sk_buff *skb)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int security_sctp_bind_connect(struct sock *sk, int optname,
|
||||
struct sockaddr *address,
|
||||
int addrlen)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void security_sctp_sk_clone(struct sctp_endpoint *ep,
|
||||
struct sock *sk,
|
||||
struct sock *newsk)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_SECURITY_NETWORK */
|
||||
|
||||
#ifdef CONFIG_SECURITY_INFINIBAND
|
||||
|
|
|
|||
|
|
@ -1473,6 +1473,7 @@ void security_inet_conn_established(struct sock *sk,
|
|||
{
|
||||
call_void_hook(inet_conn_established, sk, skb);
|
||||
}
|
||||
EXPORT_SYMBOL(security_inet_conn_established);
|
||||
|
||||
int security_secmark_relabel_packet(u32 secid)
|
||||
{
|
||||
|
|
@ -1528,6 +1529,27 @@ 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)
|
||||
{
|
||||
return call_int_hook(sctp_assoc_request, 0, ep, skb);
|
||||
}
|
||||
EXPORT_SYMBOL(security_sctp_assoc_request);
|
||||
|
||||
int security_sctp_bind_connect(struct sock *sk, int optname,
|
||||
struct sockaddr *address, int addrlen)
|
||||
{
|
||||
return call_int_hook(sctp_bind_connect, 0, sk, optname,
|
||||
address, addrlen);
|
||||
}
|
||||
EXPORT_SYMBOL(security_sctp_bind_connect);
|
||||
|
||||
void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
|
||||
struct sock *newsk)
|
||||
{
|
||||
call_void_hook(sctp_sk_clone, ep, sk, newsk);
|
||||
}
|
||||
EXPORT_SYMBOL(security_sctp_sk_clone);
|
||||
|
||||
#endif /* CONFIG_SECURITY_NETWORK */
|
||||
|
||||
#ifdef CONFIG_SECURITY_INFINIBAND
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче