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selinux: Add SCTP support

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The SELinux SCTP implementation is explained in:
Documentation/security/SELinux-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
2018-02-13 20:57:18 +00:00
committed by Paul Moore
parent 2277c7cd75
commit d452930fd3
6 changed files with 580 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

163
security/selinux/netlabel.c
View File

@@ -249,6 +249,7 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
sk = skb_to_full_sk(skb);
if (sk != NULL) {
struct sk_security_struct *sksec = sk->sk_security;
if (sksec->nlbl_state != NLBL_REQSKB)
return 0;
secattr = selinux_netlbl_sock_getattr(sk, sid);
@@ -269,6 +270,61 @@ skbuff_setsid_return:
return rc;
}
/**
* selinux_netlbl_sctp_assoc_request - Label an incoming sctp association.
* @ep: incoming association endpoint.
* @skb: the packet.
*
* Description:
* A new incoming connection is represented by @ep, ......
* Returns zero on success, negative values on failure.
*
*/
int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
struct sk_buff *skb)
{
int rc;
struct netlbl_lsm_secattr secattr;
struct sk_security_struct *sksec = ep->base.sk->sk_security;
struct sockaddr *addr;
struct sockaddr_in addr4;
#if IS_ENABLED(CONFIG_IPV6)
struct sockaddr_in6 addr6;
#endif
if (ep->base.sk->sk_family != PF_INET &&
ep->base.sk->sk_family != PF_INET6)
return 0;
netlbl_secattr_init(&secattr);
rc = security_netlbl_sid_to_secattr(ep->secid, &secattr);
if (rc != 0)
goto assoc_request_return;
/* Move skb hdr address info to a struct sockaddr and then call
* netlbl_conn_setattr().
*/
if (ip_hdr(skb)->version == 4) {
addr4.sin_family = AF_INET;
addr4.sin_addr.s_addr = ip_hdr(skb)->saddr;
addr = (struct sockaddr *)&addr4;
#if IS_ENABLED(CONFIG_IPV6)
} else {
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = ipv6_hdr(skb)->saddr;
addr = (struct sockaddr *)&addr6;
#endif
}
rc = netlbl_conn_setattr(ep->base.sk, addr, &secattr);
if (rc == 0)
sksec->nlbl_state = NLBL_LABELED;
assoc_request_return:
netlbl_secattr_destroy(&secattr);
return rc;
}
/**
* selinux_netlbl_inet_conn_request - Label an incoming stream connection
* @req: incoming connection request socket
@@ -318,6 +374,22 @@ void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
sksec->nlbl_state = NLBL_UNSET;
}
/**
* selinux_netlbl_sctp_sk_clone - Copy state to the newly created sock
* @sk: current sock
* @newsk: the new sock
*
* Description:
* Called whenever a new socket is created by accept(2) or sctp_peeloff(3).
*/
void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk)
{
struct sk_security_struct *sksec = sk->sk_security;
struct sk_security_struct *newsksec = newsk->sk_security;
newsksec->nlbl_state = sksec->nlbl_state;
}
/**
* selinux_netlbl_socket_post_create - Label a socket using NetLabel
* @sock: the socket to label
@@ -468,6 +540,69 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
return rc;
}
/**
* selinux_netlbl_socket_connect_helper - Help label a client-side socket on
* connect
* @sk: the socket to label
* @addr: the destination address
*
* Description:
* Attempt to label a connected socket with NetLabel using the given address.
* Returns zero values on success, negative values on failure.
*
*/
static int selinux_netlbl_socket_connect_helper(struct sock *sk,
struct sockaddr *addr)
{
int rc;
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr *secattr;
/* connected sockets are allowed to disconnect when the address family
* is set to AF_UNSPEC, if that is what is happening we want to reset
* the socket */
if (addr->sa_family == AF_UNSPEC) {
netlbl_sock_delattr(sk);
sksec->nlbl_state = NLBL_REQSKB;
rc = 0;
return rc;
}
secattr = selinux_netlbl_sock_genattr(sk);
if (secattr == NULL) {
rc = -ENOMEM;
return rc;
}
rc = netlbl_conn_setattr(sk, addr, secattr);
if (rc == 0)
sksec->nlbl_state = NLBL_CONNLABELED;
return rc;
}
/**
* selinux_netlbl_socket_connect_locked - Label a client-side socket on
* connect
* @sk: the socket to label
* @addr: the destination address
*
* Description:
* Attempt to label a connected socket that already has the socket locked
* with NetLabel using the given address.
* Returns zero values on success, negative values on failure.
*
*/
int selinux_netlbl_socket_connect_locked(struct sock *sk,
struct sockaddr *addr)
{
struct sk_security_struct *sksec = sk->sk_security;
if (sksec->nlbl_state != NLBL_REQSKB &&
sksec->nlbl_state != NLBL_CONNLABELED)
return 0;
return selinux_netlbl_socket_connect_helper(sk, addr);
}
/**
* selinux_netlbl_socket_connect - Label a client-side socket on connect
* @sk: the socket to label
@@ -481,34 +616,10 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
{
int rc;
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr *secattr;
if (sksec->nlbl_state != NLBL_REQSKB &&
sksec->nlbl_state != NLBL_CONNLABELED)
return 0;
lock_sock(sk);
/* connected sockets are allowed to disconnect when the address family
* is set to AF_UNSPEC, if that is what is happening we want to reset
* the socket */
if (addr->sa_family == AF_UNSPEC) {
netlbl_sock_delattr(sk);
sksec->nlbl_state = NLBL_REQSKB;
rc = 0;
goto socket_connect_return;
}
secattr = selinux_netlbl_sock_genattr(sk);
if (secattr == NULL) {
rc = -ENOMEM;
goto socket_connect_return;
}
rc = netlbl_conn_setattr(sk, addr, secattr);
if (rc == 0)
sksec->nlbl_state = NLBL_CONNLABELED;
socket_connect_return:
rc = selinux_netlbl_socket_connect_locked(sk, addr);
release_sock(sk);
return rc;
}