selinux: Set socket NetLabel based on connection endpoint
Previous work enabled the use of address based NetLabel selectors, which while highly useful, brought the potential for additional per-packet overhead when used. This patch attempts to solve that by applying NetLabel socket labels when sockets are connect()'d. This should alleviate the per-packet NetLabel labeling for all connected sockets (yes, it even works for connected DGRAM sockets). Signed-off-by: Paul Moore <paul.moore@hp.com> Reviewed-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore
parent
948bf85c1b
commit
014ab19a69
8 changed files with 311 additions and 37 deletions
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@ -207,6 +207,7 @@ void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
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int cipso_v4_sock_setattr(struct sock *sk,
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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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void cipso_v4_sock_delattr(struct sock *sk);
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int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
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int cipso_v4_skbuff_setattr(struct sk_buff *skb,
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const struct cipso_v4_doi *doi_def,
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@ -230,6 +231,10 @@ static inline int cipso_v4_sock_setattr(struct sock *sk,
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return -ENOSYS;
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}
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static inline void cipso_v4_sock_delattr(struct sock *sk)
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{
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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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@ -380,8 +380,12 @@ int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
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int netlbl_enabled(void);
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int netlbl_sock_setattr(struct sock *sk,
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const struct netlbl_lsm_secattr *secattr);
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void netlbl_sock_delattr(struct sock *sk);
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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_conn_setattr(struct sock *sk,
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struct sockaddr *addr,
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const struct netlbl_lsm_secattr *secattr);
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int netlbl_skbuff_setattr(struct sk_buff *skb,
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u16 family,
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const struct netlbl_lsm_secattr *secattr);
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@ -449,11 +453,20 @@ static inline int netlbl_sock_setattr(struct sock *sk,
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{
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return -ENOSYS;
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}
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static inline void netlbl_sock_delattr(struct sock *sk)
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{
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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_conn_setattr(struct sock *sk,
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struct sockaddr *addr,
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const 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_skbuff_setattr(struct sk_buff *skb,
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u16 family,
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const struct netlbl_lsm_secattr *secattr)
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@ -1809,6 +1809,80 @@ int cipso_v4_sock_setattr(struct sock *sk,
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return ret_val;
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}
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/**
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* cipso_v4_sock_delattr - Delete the CIPSO option from a socket
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* @sk: the socket
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*
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* Description:
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* Removes the CIPSO option from a socket, if present.
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*
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*/
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void cipso_v4_sock_delattr(struct sock *sk)
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{
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u8 hdr_delta;
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struct ip_options *opt;
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struct inet_sock *sk_inet;
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sk_inet = inet_sk(sk);
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opt = sk_inet->opt;
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if (opt == NULL || opt->cipso == 0)
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return;
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if (opt->srr || opt->rr || opt->ts || opt->router_alert) {
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u8 cipso_len;
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u8 cipso_off;
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unsigned char *cipso_ptr;
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int iter;
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int optlen_new;
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cipso_off = opt->cipso - sizeof(struct iphdr);
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cipso_ptr = &opt->__data[cipso_off];
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cipso_len = cipso_ptr[1];
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if (opt->srr > opt->cipso)
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opt->srr -= cipso_len;
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if (opt->rr > opt->cipso)
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opt->rr -= cipso_len;
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if (opt->ts > opt->cipso)
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opt->ts -= cipso_len;
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if (opt->router_alert > opt->cipso)
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opt->router_alert -= cipso_len;
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opt->cipso = 0;
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memmove(cipso_ptr, cipso_ptr + cipso_len,
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opt->optlen - cipso_off - cipso_len);
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/* determining the new total option length is tricky because of
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* the padding necessary, the only thing i can think to do at
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* this point is walk the options one-by-one, skipping the
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* padding at the end to determine the actual option size and
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* from there we can determine the new total option length */
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iter = 0;
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optlen_new = 0;
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while (iter < opt->optlen)
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if (opt->__data[iter] != IPOPT_NOP) {
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iter += opt->__data[iter + 1];
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optlen_new = iter;
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} else
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iter++;
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hdr_delta = opt->optlen;
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opt->optlen = (optlen_new + 3) & ~3;
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hdr_delta -= opt->optlen;
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} else {
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/* only the cipso option was present on the socket so we can
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* remove the entire option struct */
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sk_inet->opt = NULL;
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hdr_delta = opt->optlen;
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kfree(opt);
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}
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if (sk_inet->is_icsk && hdr_delta > 0) {
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struct inet_connection_sock *sk_conn = inet_csk(sk);
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sk_conn->icsk_ext_hdr_len -= hdr_delta;
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sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
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}
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}
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/**
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* cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions
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* @cipso: the CIPSO v4 option
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@ -10,7 +10,7 @@
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -455,6 +455,20 @@ int netlbl_sock_setattr(struct sock *sk,
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return ret_val;
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}
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/**
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* netlbl_sock_delattr - Delete all the NetLabel labels on a socket
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* @sk: the socket
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*
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* Description:
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* Remove all the NetLabel labeling from @sk. The caller is responsible for
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* ensuring that @sk is locked.
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*
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*/
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void netlbl_sock_delattr(struct sock *sk)
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{
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cipso_v4_sock_delattr(sk);
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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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@ -472,6 +486,68 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
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return cipso_v4_sock_getattr(sk, secattr);
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}
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/**
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* netlbl_conn_setattr - Label a connected socket using the correct protocol
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* @sk: the socket to label
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* @addr: the destination address
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* @secattr: the security attributes
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*
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* Description:
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* Attach the correct label to the given connected socket using the security
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* attributes specified in @secattr. The caller is responsible for ensuring
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* that @sk is locked. Returns zero on success, negative values on failure.
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*
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*/
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int netlbl_conn_setattr(struct sock *sk,
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struct sockaddr *addr,
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const struct netlbl_lsm_secattr *secattr)
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{
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int ret_val;
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struct sockaddr_in *addr4;
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struct netlbl_domaddr4_map *af4_entry;
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rcu_read_lock();
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switch (addr->sa_family) {
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case AF_INET:
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addr4 = (struct sockaddr_in *)addr;
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af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
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addr4->sin_addr.s_addr);
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if (af4_entry == NULL) {
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ret_val = -ENOENT;
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goto conn_setattr_return;
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}
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switch (af4_entry->type) {
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case NETLBL_NLTYPE_CIPSOV4:
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ret_val = cipso_v4_sock_setattr(sk,
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af4_entry->type_def.cipsov4,
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secattr);
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break;
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case NETLBL_NLTYPE_UNLABELED:
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/* just delete the protocols we support for right now
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* but we could remove other protocols if needed */
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cipso_v4_sock_delattr(sk);
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ret_val = 0;
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break;
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default:
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ret_val = -ENOENT;
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}
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break;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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case AF_INET6:
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/* since we don't support any IPv6 labeling protocols right
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* now we can optimize everything away until we do */
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ret_val = 0;
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break;
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#endif /* IPv6 */
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default:
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ret_val = 0;
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}
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conn_setattr_return:
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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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* netlbl_skbuff_setattr - Label a packet using the correct protocol
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* @skb: the packet
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@ -3794,6 +3794,7 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
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static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
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{
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struct sock *sk = sock->sk;
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struct inode_security_struct *isec;
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int err;
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@ -3807,7 +3808,6 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
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isec = SOCK_INODE(sock)->i_security;
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if (isec->sclass == SECCLASS_TCP_SOCKET ||
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isec->sclass == SECCLASS_DCCP_SOCKET) {
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struct sock *sk = sock->sk;
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struct avc_audit_data ad;
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struct sockaddr_in *addr4 = NULL;
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struct sockaddr_in6 *addr6 = NULL;
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@ -3841,6 +3841,8 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
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goto out;
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}
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err = selinux_netlbl_socket_connect(sk, address);
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out:
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return err;
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}
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@ -4290,8 +4292,6 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
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sk->sk_family == PF_UNIX)
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isec->sid = sksec->sid;
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sksec->sclass = isec->sclass;
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selinux_netlbl_sock_graft(sk, parent);
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}
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static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
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@ -4342,8 +4342,7 @@ static void selinux_inet_csk_clone(struct sock *newsk,
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selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
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}
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static void selinux_inet_conn_established(struct sock *sk,
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struct sk_buff *skb)
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static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
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{
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u16 family = sk->sk_family;
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struct sk_security_struct *sksec = sk->sk_security;
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@ -4353,6 +4352,8 @@ static void selinux_inet_conn_established(struct sock *sk,
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family = PF_INET;
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selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
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selinux_netlbl_inet_conn_established(sk, family);
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}
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static void selinux_req_classify_flow(const struct request_sock *req,
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@ -52,7 +52,7 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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u16 family,
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u32 sid);
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void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
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void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family);
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int selinux_netlbl_socket_post_create(struct socket *sock);
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int selinux_netlbl_inode_permission(struct inode *inode, int mask);
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int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
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@ -62,6 +62,8 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
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int selinux_netlbl_socket_setsockopt(struct socket *sock,
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int level,
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int optname);
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int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr);
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#else
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static inline void selinux_netlbl_cache_invalidate(void)
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{
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@ -98,8 +100,14 @@ static inline int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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return 0;
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}
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static inline void selinux_netlbl_sock_graft(struct sock *sk,
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struct socket *sock)
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static inline int selinux_netlbl_conn_setsid(struct sock *sk,
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struct sockaddr *addr)
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{
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return 0;
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}
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static inline void selinux_netlbl_inet_conn_established(struct sock *sk,
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u16 family)
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{
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return;
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}
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@ -125,6 +133,11 @@ static inline int selinux_netlbl_socket_setsockopt(struct socket *sock,
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{
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return 0;
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}
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static inline int selinux_netlbl_socket_connect(struct sock *sk,
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struct sockaddr *addr)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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#endif
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@ -118,6 +118,7 @@ struct sk_security_struct {
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NLBL_REQUIRE,
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NLBL_LABELED,
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NLBL_REQSKB,
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NLBL_CONNLABELED,
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} nlbl_state;
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#endif
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};
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@ -29,10 +29,12 @@
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/sock.h>
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#include <net/netlabel.h>
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#include <net/inet_sock.h>
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#include <net/inet_connection_sock.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include "objsec.h"
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#include "security.h"
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@ -79,8 +81,6 @@ static int selinux_netlbl_sock_setsid(struct sock *sk)
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int rc;
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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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struct inet_sock *sk_inet;
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struct inet_connection_sock *sk_conn;
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if (sksec->nlbl_state != NLBL_REQUIRE)
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return 0;
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@ -96,20 +96,6 @@ static int selinux_netlbl_sock_setsid(struct sock *sk)
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sksec->nlbl_state = NLBL_LABELED;
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break;
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case -EDESTADDRREQ:
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/* we are going to possibly end up labeling the individual
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* packets later which is problematic for stream sockets
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* because of the additional IP header size, our solution is to
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* allow for the maximum IP header length (40 bytes for IPv4,
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* we don't have to worry about IPv6 yet) just in case */
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sk_inet = inet_sk(sk);
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if (sk_inet->is_icsk) {
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sk_conn = inet_csk(sk);
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if (sk_inet->opt)
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sk_conn->icsk_ext_hdr_len -=
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sk_inet->opt->optlen;
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sk_conn->icsk_ext_hdr_len += 40;
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sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
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}
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sksec->nlbl_state = NLBL_REQSKB;
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rc = 0;
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break;
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@ -247,21 +233,77 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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}
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/**
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* selinux_netlbl_sock_graft - Netlabel the new socket
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* selinux_netlbl_inet_conn_established - Netlabel the newly accepted connection
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* @sk: the new connection
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* @sock: the new socket
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*
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* Description:
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* The connection represented by @sk is being grafted onto @sock so set the
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* socket's NetLabel to match the SID of @sk.
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* A new connection has been established on @sk so make sure it is labeled
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* correctly with the NetLabel susbsystem.
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*
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*/
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void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
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void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family)
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{
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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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* selinux_netlbl_inode_permission(). */
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selinux_netlbl_sock_setsid(sk);
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int rc;
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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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struct inet_sock *sk_inet = inet_sk(sk);
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struct sockaddr_in addr;
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if (sksec->nlbl_state != NLBL_REQUIRE)
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return;
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netlbl_secattr_init(&secattr);
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||||
if (security_netlbl_sid_to_secattr(sksec->sid, &secattr) != 0)
|
||||
goto inet_conn_established_return;
|
||||
|
||||
rc = netlbl_sock_setattr(sk, &secattr);
|
||||
switch (rc) {
|
||||
case 0:
|
||||
sksec->nlbl_state = NLBL_LABELED;
|
||||
break;
|
||||
case -EDESTADDRREQ:
|
||||
/* no PF_INET6 support yet because we don't support any IPv6
|
||||
* labeling protocols */
|
||||
if (family != PF_INET) {
|
||||
sksec->nlbl_state = NLBL_UNSET;
|
||||
goto inet_conn_established_return;
|
||||
}
|
||||
|
||||
addr.sin_family = family;
|
||||
addr.sin_addr.s_addr = sk_inet->daddr;
|
||||
if (netlbl_conn_setattr(sk, (struct sockaddr *)&addr,
|
||||
&secattr) != 0) {
|
||||
/* we failed to label the connected socket (could be
|
||||
* for a variety of reasons, the actual "why" isn't
|
||||
* important here) so we have to go to our backup plan,
|
||||
* labeling the packets individually in the netfilter
|
||||
* local output hook. this is okay but we need to
|
||||
* adjust the MSS of the connection to take into
|
||||
* account any labeling overhead, since we don't know
|
||||
* the exact overhead at this point we'll use the worst
|
||||
* case value which is 40 bytes for IPv4 */
|
||||
struct inet_connection_sock *sk_conn = inet_csk(sk);
|
||||
sk_conn->icsk_ext_hdr_len += 40 -
|
||||
(sk_inet->opt ? sk_inet->opt->optlen : 0);
|
||||
sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
|
||||
|
||||
sksec->nlbl_state = NLBL_REQSKB;
|
||||
} else
|
||||
sksec->nlbl_state = NLBL_CONNLABELED;
|
||||
break;
|
||||
default:
|
||||
/* note that we are failing to label the socket which could be
|
||||
* a bad thing since it means traffic could leave the system
|
||||
* without the desired labeling, however, all is not lost as
|
||||
* we have a check in selinux_netlbl_inode_permission() to
|
||||
* pick up the pieces that we might drop here because we can't
|
||||
* return an error code */
|
||||
break;
|
||||
}
|
||||
|
||||
inet_conn_established_return:
|
||||
netlbl_secattr_destroy(&secattr);
|
||||
return;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -398,7 +440,8 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
|
|||
struct netlbl_lsm_secattr secattr;
|
||||
|
||||
if (level == IPPROTO_IP && optname == IP_OPTIONS &&
|
||||
sksec->nlbl_state == NLBL_LABELED) {
|
||||
(sksec->nlbl_state == NLBL_LABELED ||
|
||||
sksec->nlbl_state == NLBL_CONNLABELED)) {
|
||||
netlbl_secattr_init(&secattr);
|
||||
lock_sock(sk);
|
||||
rc = netlbl_sock_getattr(sk, &secattr);
|
||||
|
|
@ -410,3 +453,51 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
|
|||
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* selinux_netlbl_socket_connect - 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.
|
||||
*
|
||||
*/
|
||||
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;
|
||||
|
||||
netlbl_secattr_init(&secattr);
|
||||
local_bh_disable();
|
||||
bh_lock_sock_nested(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;
|
||||
}
|
||||
rc = security_netlbl_sid_to_secattr(sksec->sid, &secattr);
|
||||
if (rc != 0)
|
||||
goto socket_connect_return;
|
||||
rc = netlbl_conn_setattr(sk, addr, &secattr);
|
||||
if (rc != 0)
|
||||
goto socket_connect_return;
|
||||
sksec->nlbl_state = NLBL_CONNLABELED;
|
||||
|
||||
socket_connect_return:
|
||||
bh_unlock_sock(sk);
|
||||
local_bh_enable();
|
||||
netlbl_secattr_destroy(&secattr);
|
||||
return rc;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue