[NetLabel]: correct improper handling of non-NetLabel peer contexts
Fix a problem where NetLabel would always set the value of sk_security_struct->peer_sid in selinux_netlbl_sock_graft() to the context of the socket, causing problems when users would query the context of the connection. This patch fixes this so that the value in sk_security_struct->peer_sid is only set when the connection is NetLabel based, otherwise the value is untouched. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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597811ec16
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@ -205,6 +205,7 @@ void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
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int cipso_v4_socket_setattr(const struct socket *sock,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr);
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int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
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int cipso_v4_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr);
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int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
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@ -225,6 +226,12 @@ static inline int cipso_v4_socket_setattr(const struct socket *sock,
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return -ENOSYS;
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}
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static inline int cipso_v4_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr)
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{
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@ -238,6 +238,8 @@ static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr,
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#ifdef CONFIG_NETLABEL
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int netlbl_socket_setattr(const struct socket *sock,
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const struct netlbl_lsm_secattr *secattr);
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int netlbl_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr);
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int netlbl_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr);
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int netlbl_skbuff_getattr(const struct sk_buff *skb,
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@ -250,6 +252,12 @@ static inline int netlbl_socket_setattr(const struct socket *sock,
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return -ENOSYS;
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}
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static inline int netlbl_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int netlbl_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr)
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{
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@ -1485,6 +1485,54 @@ socket_setattr_failure:
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return ret_val;
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}
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/**
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* cipso_v4_sock_getattr - Get the security attributes from a sock
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* @sk: the sock
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* @secattr: the security attributes
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*
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* Description:
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* Query @sk to see if there is a CIPSO option attached to the sock and if
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* there is return the CIPSO security attributes in @secattr. This function
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* requires that @sk be locked, or privately held, but it does not do any
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* locking itself. Returns zero on success and negative values on failure.
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*
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*/
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int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
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{
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int ret_val = -ENOMSG;
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struct inet_sock *sk_inet;
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unsigned char *cipso_ptr;
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u32 doi;
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struct cipso_v4_doi *doi_def;
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sk_inet = inet_sk(sk);
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if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0)
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return -ENOMSG;
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cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso -
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sizeof(struct iphdr);
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ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr);
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if (ret_val == 0)
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return ret_val;
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doi = ntohl(*(u32 *)&cipso_ptr[2]);
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rcu_read_lock();
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doi_def = cipso_v4_doi_getdef(doi);
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if (doi_def == NULL) {
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rcu_read_unlock();
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return -ENOMSG;
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}
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switch (cipso_ptr[6]) {
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case CIPSO_V4_TAG_RBITMAP:
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ret_val = cipso_v4_parsetag_rbm(doi_def,
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&cipso_ptr[6],
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secattr);
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break;
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}
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rcu_read_unlock();
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return ret_val;
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}
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/**
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* cipso_v4_socket_getattr - Get the security attributes from a socket
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* @sock: the socket
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@ -1499,42 +1547,12 @@ socket_setattr_failure:
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int cipso_v4_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr)
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{
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int ret_val = -ENOMSG;
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struct sock *sk;
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struct inet_sock *sk_inet;
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unsigned char *cipso_ptr;
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u32 doi;
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struct cipso_v4_doi *doi_def;
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int ret_val;
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sk = sock->sk;
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lock_sock(sk);
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sk_inet = inet_sk(sk);
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if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0)
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goto socket_getattr_return;
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cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso -
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sizeof(struct iphdr);
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ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr);
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if (ret_val == 0)
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goto socket_getattr_return;
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lock_sock(sock->sk);
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ret_val = cipso_v4_sock_getattr(sock->sk, secattr);
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release_sock(sock->sk);
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doi = ntohl(*(u32 *)&cipso_ptr[2]);
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rcu_read_lock();
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doi_def = cipso_v4_doi_getdef(doi);
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if (doi_def == NULL) {
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rcu_read_unlock();
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goto socket_getattr_return;
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}
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switch (cipso_ptr[6]) {
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case CIPSO_V4_TAG_RBITMAP:
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ret_val = cipso_v4_parsetag_rbm(doi_def,
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&cipso_ptr[6],
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secattr);
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break;
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}
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rcu_read_unlock();
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socket_getattr_return:
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release_sock(sk);
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return ret_val;
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}
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@ -84,6 +84,29 @@ socket_setattr_return:
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return ret_val;
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}
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/**
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* netlbl_sock_getattr - Determine the security attributes of a sock
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* @sk: the sock
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* @secattr: the security attributes
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*
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* Description:
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* Examines the given sock to see any NetLabel style labeling has been
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* applied to the sock, if so it parses the socket label and returns the
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* security attributes in @secattr. Returns zero on success, negative values
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* on failure.
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*
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*/
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int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
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{
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int ret_val;
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ret_val = cipso_v4_sock_getattr(sk, secattr);
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if (ret_val == 0)
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return 0;
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return netlbl_unlabel_getattr(secattr);
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}
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/**
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* netlbl_socket_getattr - Determine the security attributes of a socket
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* @sock: the socket
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@ -2502,14 +2502,24 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
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{
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struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
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struct sk_security_struct *sksec = sk->sk_security;
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struct netlbl_lsm_secattr secattr;
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u32 nlbl_peer_sid;
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sksec->sclass = isec->sclass;
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if (sk->sk_family != PF_INET)
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return;
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netlbl_secattr_init(&secattr);
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if (netlbl_sock_getattr(sk, &secattr) == 0 &&
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selinux_netlbl_secattr_to_sid(NULL,
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&secattr,
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sksec->sid,
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&nlbl_peer_sid) == 0)
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sksec->peer_sid = nlbl_peer_sid;
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netlbl_secattr_destroy(&secattr, 0);
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sksec->nlbl_state = NLBL_REQUIRE;
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sksec->peer_sid = sksec->sid;
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/* Try to set the NetLabel on the socket to save time later, if we fail
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* here we will pick up the pieces in later calls to
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