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23be1e0e2a
Initially, commit4237c75c0a
("[MLSXFRM]: Auto-labeling of child sockets") introduced security_inet_conn_request() in some functions where reqsk is allocated. The hook is added just after the allocation, so reqsk's IPv6 remote address was not initialised then. However, SELinux/Smack started to read it in netlbl_req_setattr() after commite1adea9270
("calipso: Allow request sockets to be relabelled by the lsm."). Commit284904aa79
("lsm: Relocate the IPv4 security_inet_conn_request() hooks") fixed that kind of issue only in TCPv4 because IPv6 labeling was not supported at that time. Finally, the same issue was introduced again in IPv6. Let's apply the same fix on DCCPv6 and TCPv6. Fixes:e1adea9270
("calipso: Allow request sockets to be relabelled by the lsm.") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
273 lines
7.6 KiB
C
273 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IPv6 Syncookies implementation for the Linux kernel
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*
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* Authors:
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* Glenn Griffin <ggriffin.kernel@gmail.com>
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*
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* Based on IPv4 implementation by Andi Kleen
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* linux/net/ipv4/syncookies.c
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*/
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#include <linux/tcp.h>
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#include <linux/random.h>
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#include <linux/siphash.h>
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#include <linux/kernel.h>
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#include <net/secure_seq.h>
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#include <net/ipv6.h>
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#include <net/tcp.h>
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#define COOKIEBITS 24 /* Upper bits store count */
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#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
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static siphash_aligned_key_t syncookie6_secret[2];
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/* RFC 2460, Section 8.3:
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* [ipv6 tcp] MSS must be computed as the maximum packet size minus 60 [..]
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*
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* Due to IPV6_MIN_MTU=1280 the lowest possible MSS is 1220, which allows
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* using higher values than ipv4 tcp syncookies.
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* The other values are chosen based on ethernet (1500 and 9k MTU), plus
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* one that accounts for common encap (PPPoe) overhead. Table must be sorted.
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*/
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static __u16 const msstab[] = {
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1280 - 60, /* IPV6_MIN_MTU - 60 */
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1480 - 60,
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1500 - 60,
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9000 - 60,
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};
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static u32 cookie_hash(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__be16 sport, __be16 dport, u32 count, int c)
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{
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const struct {
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struct in6_addr saddr;
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struct in6_addr daddr;
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u32 count;
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__be16 sport;
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__be16 dport;
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} __aligned(SIPHASH_ALIGNMENT) combined = {
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.saddr = *saddr,
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.daddr = *daddr,
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.count = count,
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.sport = sport,
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.dport = dport
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};
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net_get_random_once(syncookie6_secret, sizeof(syncookie6_secret));
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return siphash(&combined, offsetofend(typeof(combined), dport),
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&syncookie6_secret[c]);
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}
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static __u32 secure_tcp_syn_cookie(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__be16 sport, __be16 dport, __u32 sseq,
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__u32 data)
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{
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u32 count = tcp_cookie_time();
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return (cookie_hash(saddr, daddr, sport, dport, 0, 0) +
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sseq + (count << COOKIEBITS) +
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((cookie_hash(saddr, daddr, sport, dport, count, 1) + data)
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& COOKIEMASK));
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}
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static __u32 check_tcp_syn_cookie(__u32 cookie, const struct in6_addr *saddr,
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const struct in6_addr *daddr, __be16 sport,
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__be16 dport, __u32 sseq)
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{
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__u32 diff, count = tcp_cookie_time();
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cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0) + sseq;
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diff = (count - (cookie >> COOKIEBITS)) & ((__u32) -1 >> COOKIEBITS);
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if (diff >= MAX_SYNCOOKIE_AGE)
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return (__u32)-1;
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return (cookie -
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cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
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& COOKIEMASK;
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}
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u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph,
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const struct tcphdr *th, __u16 *mssp)
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{
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int mssind;
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const __u16 mss = *mssp;
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for (mssind = ARRAY_SIZE(msstab) - 1; mssind ; mssind--)
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if (mss >= msstab[mssind])
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break;
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*mssp = msstab[mssind];
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return secure_tcp_syn_cookie(&iph->saddr, &iph->daddr, th->source,
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th->dest, ntohl(th->seq), mssind);
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}
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EXPORT_SYMBOL_GPL(__cookie_v6_init_sequence);
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__u32 cookie_v6_init_sequence(const struct sk_buff *skb, __u16 *mssp)
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{
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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const struct tcphdr *th = tcp_hdr(skb);
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return __cookie_v6_init_sequence(iph, th, mssp);
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}
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int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th,
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__u32 cookie)
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{
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__u32 seq = ntohl(th->seq) - 1;
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__u32 mssind = check_tcp_syn_cookie(cookie, &iph->saddr, &iph->daddr,
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th->source, th->dest, seq);
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return mssind < ARRAY_SIZE(msstab) ? msstab[mssind] : 0;
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}
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EXPORT_SYMBOL_GPL(__cookie_v6_check);
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struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
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{
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struct tcp_options_received tcp_opt;
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struct inet_request_sock *ireq;
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struct tcp_request_sock *treq;
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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const struct tcphdr *th = tcp_hdr(skb);
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__u32 cookie = ntohl(th->ack_seq) - 1;
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struct sock *ret = sk;
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struct request_sock *req;
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int full_space, mss;
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struct dst_entry *dst;
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__u8 rcv_wscale;
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u32 tsoff = 0;
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int l3index;
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if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies) ||
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!th->ack || th->rst)
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goto out;
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if (tcp_synq_no_recent_overflow(sk))
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goto out;
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mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie);
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if (mss == 0) {
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__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
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goto out;
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}
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__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESRECV);
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/* check for timestamp cookie support */
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memset(&tcp_opt, 0, sizeof(tcp_opt));
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tcp_parse_options(sock_net(sk), skb, &tcp_opt, 0, NULL);
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if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
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tsoff = secure_tcpv6_ts_off(sock_net(sk),
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ipv6_hdr(skb)->daddr.s6_addr32,
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ipv6_hdr(skb)->saddr.s6_addr32);
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tcp_opt.rcv_tsecr -= tsoff;
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}
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if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
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goto out;
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ret = NULL;
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req = cookie_tcp_reqsk_alloc(&tcp6_request_sock_ops,
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&tcp_request_sock_ipv6_ops, sk, skb);
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if (!req)
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goto out;
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ireq = inet_rsk(req);
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treq = tcp_rsk(req);
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treq->tfo_listener = false;
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req->mss = mss;
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ireq->ir_rmt_port = th->source;
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ireq->ir_num = ntohs(th->dest);
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ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
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ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
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if (security_inet_conn_request(sk, skb, req))
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goto out_free;
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if (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) ||
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np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
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np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
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refcount_inc(&skb->users);
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ireq->pktopts = skb;
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}
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ireq->ir_iif = inet_request_bound_dev_if(sk, skb);
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/* So that link locals have meaning */
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if (!sk->sk_bound_dev_if &&
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ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
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ireq->ir_iif = tcp_v6_iif(skb);
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ireq->ir_mark = inet_request_mark(sk, skb);
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req->num_retrans = 0;
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ireq->snd_wscale = tcp_opt.snd_wscale;
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ireq->sack_ok = tcp_opt.sack_ok;
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ireq->wscale_ok = tcp_opt.wscale_ok;
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ireq->tstamp_ok = tcp_opt.saw_tstamp;
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req->ts_recent = tcp_opt.saw_tstamp ? tcp_opt.rcv_tsval : 0;
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treq->snt_synack = 0;
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treq->rcv_isn = ntohl(th->seq) - 1;
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treq->snt_isn = cookie;
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treq->ts_off = 0;
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treq->txhash = net_tx_rndhash();
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l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
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tcp_ao_syncookie(sk, skb, treq, AF_INET6, l3index);
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if (IS_ENABLED(CONFIG_SMC))
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ireq->smc_ok = 0;
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/*
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* We need to lookup the dst_entry to get the correct window size.
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* This is taken from tcp_v6_syn_recv_sock. Somebody please enlighten
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* me if there is a preferred way.
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*/
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{
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struct in6_addr *final_p, final;
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struct flowi6 fl6;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_proto = IPPROTO_TCP;
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fl6.daddr = ireq->ir_v6_rmt_addr;
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final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
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fl6.saddr = ireq->ir_v6_loc_addr;
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fl6.flowi6_oif = ireq->ir_iif;
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fl6.flowi6_mark = ireq->ir_mark;
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fl6.fl6_dport = ireq->ir_rmt_port;
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fl6.fl6_sport = inet_sk(sk)->inet_sport;
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fl6.flowi6_uid = sk->sk_uid;
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security_req_classify_flow(req, flowi6_to_flowi_common(&fl6));
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dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
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if (IS_ERR(dst))
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goto out_free;
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}
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req->rsk_window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
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/* limit the window selection if the user enforce a smaller rx buffer */
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full_space = tcp_full_space(sk);
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if (sk->sk_userlocks & SOCK_RCVBUF_LOCK &&
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(req->rsk_window_clamp > full_space || req->rsk_window_clamp == 0))
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req->rsk_window_clamp = full_space;
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tcp_select_initial_window(sk, full_space, req->mss,
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&req->rsk_rcv_wnd, &req->rsk_window_clamp,
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ireq->wscale_ok, &rcv_wscale,
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dst_metric(dst, RTAX_INITRWND));
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ireq->rcv_wscale = rcv_wscale;
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ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), dst);
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ret = tcp_get_cookie_sock(sk, skb, req, dst, tsoff);
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out:
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return ret;
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out_free:
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reqsk_free(req);
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return NULL;
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}
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