Date: Mon, 21 Aug 2017 13:52:21 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r322750 - head/sys/netipsec Message-ID: <201708211352.v7LDqLjW033409@repo.freebsd.org>
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Author: ae Date: Mon Aug 21 13:52:21 2017 New Revision: 322750 URL: https://svnweb.freebsd.org/changeset/base/322750 Log: Fix the regression introduced in r275710. When a security policy should match TCP connection with specific ports, the SYN+ACK segment send by syncache_respond() is considered as forwarded packet, because at this moment TCP connection does not have PCB structure, and ip_output() is called without inpcb pointer. In this case SPIDX filled for SP lookup will not contain TCP ports and security policy will not be found. This can lead to unencrypted SYN+ACK on the wire. This patch restores the old behavior, when ports will not be filled only for forwarded packets. Reported by: Dewayne Geraghty <dewayne.geraghty at heuristicsystems.com.au> MFC after: 1 week Modified: head/sys/netipsec/ipsec.c head/sys/netipsec/ipsec.h head/sys/netipsec/ipsec6.h head/sys/netipsec/ipsec_output.c Modified: head/sys/netipsec/ipsec.c ============================================================================== --- head/sys/netipsec/ipsec.c Mon Aug 21 12:42:05 2017 (r322749) +++ head/sys/netipsec/ipsec.c Mon Aug 21 13:52:21 2017 (r322750) @@ -563,7 +563,8 @@ ipsec4_setspidx_ipaddr(const struct mbuf *m, struct se } static struct secpolicy * -ipsec4_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir) +ipsec4_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir, + int needport) { struct secpolicyindex spidx; struct secpolicy *sp; @@ -573,7 +574,7 @@ ipsec4_getpolicy(const struct mbuf *m, struct inpcb *i /* Make an index to look for a policy. */ ipsec4_setspidx_ipaddr(m, &spidx); /* Fill ports in spidx if we have inpcb. */ - ipsec4_get_ulp(m, &spidx, inp != NULL); + ipsec4_get_ulp(m, &spidx, needport); spidx.dir = dir; sp = key_allocsp(&spidx, dir); } @@ -586,12 +587,13 @@ ipsec4_getpolicy(const struct mbuf *m, struct inpcb *i * Check security policy for *OUTBOUND* IPv4 packet. */ struct secpolicy * -ipsec4_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error) +ipsec4_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error, + int needport) { struct secpolicy *sp; *error = 0; - sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_OUTBOUND); + sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_OUTBOUND, needport); if (sp != NULL) sp = ipsec_checkpolicy(sp, inp, error); if (sp == NULL) { @@ -623,7 +625,7 @@ ipsec4_in_reject(const struct mbuf *m, struct inpcb *i struct secpolicy *sp; int result; - sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_INBOUND); + sp = ipsec4_getpolicy(m, inp, IPSEC_DIR_INBOUND, 0); result = ipsec_in_reject(sp, inp, m); key_freesp(&sp); if (result != 0) @@ -731,7 +733,8 @@ ipsec6_setspidx_ipaddr(const struct mbuf *m, struct se } static struct secpolicy * -ipsec6_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir) +ipsec6_getpolicy(const struct mbuf *m, struct inpcb *inp, u_int dir, + int needport) { struct secpolicyindex spidx; struct secpolicy *sp; @@ -741,7 +744,7 @@ ipsec6_getpolicy(const struct mbuf *m, struct inpcb *i /* Make an index to look for a policy. */ ipsec6_setspidx_ipaddr(m, &spidx); /* Fill ports in spidx if we have inpcb. */ - ipsec6_get_ulp(m, &spidx, inp != NULL); + ipsec6_get_ulp(m, &spidx, needport); spidx.dir = dir; sp = key_allocsp(&spidx, dir); } @@ -754,12 +757,13 @@ ipsec6_getpolicy(const struct mbuf *m, struct inpcb *i * Check security policy for *OUTBOUND* IPv6 packet. */ struct secpolicy * -ipsec6_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error) +ipsec6_checkpolicy(const struct mbuf *m, struct inpcb *inp, int *error, + int needport) { struct secpolicy *sp; *error = 0; - sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_OUTBOUND); + sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_OUTBOUND, needport); if (sp != NULL) sp = ipsec_checkpolicy(sp, inp, error); if (sp == NULL) { @@ -791,7 +795,7 @@ ipsec6_in_reject(const struct mbuf *m, struct inpcb *i struct secpolicy *sp; int result; - sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_INBOUND); + sp = ipsec6_getpolicy(m, inp, IPSEC_DIR_INBOUND, 0); result = ipsec_in_reject(sp, inp, m); key_freesp(&sp); if (result) Modified: head/sys/netipsec/ipsec.h ============================================================================== --- head/sys/netipsec/ipsec.h Mon Aug 21 12:42:05 2017 (r322749) +++ head/sys/netipsec/ipsec.h Mon Aug 21 13:52:21 2017 (r322750) @@ -320,7 +320,7 @@ int ipsec_if_input(struct mbuf *, struct secasvar *, u struct ipsecrequest *ipsec_newisr(void); void ipsec_delisr(struct ipsecrequest *); struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *, - int *); + int *, int); u_int ipsec_get_reqlevel(struct secpolicy *, u_int); Modified: head/sys/netipsec/ipsec6.h ============================================================================== --- head/sys/netipsec/ipsec6.h Mon Aug 21 12:42:05 2017 (r322749) +++ head/sys/netipsec/ipsec6.h Mon Aug 21 13:52:21 2017 (r322750) @@ -60,7 +60,7 @@ VNET_DECLARE(int, ip6_ipsec_ecn); struct inpcb; struct secpolicy *ipsec6_checkpolicy(const struct mbuf *, - struct inpcb *, int *); + struct inpcb *, int *, int); void ipsec6_setsockaddrs(const struct mbuf *, union sockaddr_union *, union sockaddr_union *); Modified: head/sys/netipsec/ipsec_output.c ============================================================================== --- head/sys/netipsec/ipsec_output.c Mon Aug 21 12:42:05 2017 (r322749) +++ head/sys/netipsec/ipsec_output.c Mon Aug 21 13:52:21 2017 (r322750) @@ -297,7 +297,7 @@ ipsec4_common_output(struct mbuf *m, struct inpcb *inp int error; /* Lookup for the corresponding outbound security policy */ - sp = ipsec4_checkpolicy(m, inp, &error); + sp = ipsec4_checkpolicy(m, inp, &error, !forwarding); if (sp == NULL) { if (error == -EINVAL) { /* Discarded by policy. */ @@ -599,7 +599,7 @@ ipsec6_common_output(struct mbuf *m, struct inpcb *inp int error; /* Lookup for the corresponding outbound security policy */ - sp = ipsec6_checkpolicy(m, inp, &error); + sp = ipsec6_checkpolicy(m, inp, &error, !forwarding); if (sp == NULL) { if (error == -EINVAL) { /* Discarded by policy. */
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