xform_tcp.c revision 1.1.2.4
1 1.1.2.4 skrll /* $NetBSD: xform_tcp.c,v 1.1.2.4 2004/09/21 13:37:48 skrll Exp $ */ 2 1.1.2.2 skrll /* $FreeBSD: sys/netipsec/xform_tcp.c,v 1.1.2.1 2004/02/14 22:24:09 bms Exp $ */ 3 1.1.2.2 skrll 4 1.1.2.2 skrll /* 5 1.1.2.2 skrll * Copyright (c) 2003 Bruce M. Simpson <bms (at) spc.org> 6 1.1.2.2 skrll * 7 1.1.2.2 skrll * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 skrll * modification, are permitted provided that the following conditions 9 1.1.2.2 skrll * are met: 10 1.1.2.2 skrll * 11 1.1.2.2 skrll * 1. Redistributions of source code must retain the above copyright 12 1.1.2.2 skrll * notice, this list of conditions and the following disclaimer. 13 1.1.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 14 1.1.2.2 skrll * notice, this list of conditions and the following disclaimer in the 15 1.1.2.2 skrll * documentation and/or other materials provided with the distribution. 16 1.1.2.2 skrll * 3. The name of the author may not be used to endorse or promote products 17 1.1.2.2 skrll * derived from this software without specific prior written permission. 18 1.1.2.2 skrll * 19 1.1.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 1.1.2.2 skrll * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 1.1.2.2 skrll * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 1.1.2.2 skrll * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 1.1.2.2 skrll * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 1.1.2.2 skrll * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 1.1.2.2 skrll * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 1.1.2.2 skrll * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 1.1.2.2 skrll * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 1.1.2.2 skrll * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 1.1.2.2 skrll */ 30 1.1.2.2 skrll 31 1.1.2.2 skrll /* TCP MD5 Signature Option (RFC2385) */ 32 1.1.2.2 skrll #include "opt_inet.h" 33 1.1.2.2 skrll 34 1.1.2.2 skrll #include <sys/param.h> 35 1.1.2.2 skrll #include <sys/systm.h> 36 1.1.2.2 skrll #include <sys/mbuf.h> 37 1.1.2.2 skrll #include <sys/lock.h> 38 1.1.2.2 skrll #include <sys/socket.h> 39 1.1.2.2 skrll #include <sys/kernel.h> 40 1.1.2.2 skrll #include <sys/protosw.h> 41 1.1.2.2 skrll #include <sys/sysctl.h> 42 1.1.2.2 skrll 43 1.1.2.2 skrll #include <netinet/in.h> 44 1.1.2.2 skrll #include <netinet/in_systm.h> 45 1.1.2.2 skrll #include <netinet/ip.h> 46 1.1.2.2 skrll #include <netinet/ip_var.h> 47 1.1.2.2 skrll #include <netinet/tcp_timer.h> 48 1.1.2.2 skrll #include <netinet/tcp.h> 49 1.1.2.2 skrll #include <netinet/tcp_var.h> 50 1.1.2.2 skrll 51 1.1.2.2 skrll #include <net/route.h> 52 1.1.2.2 skrll #include <netipsec/ipsec.h> 53 1.1.2.2 skrll #include <netipsec/xform.h> 54 1.1.2.2 skrll 55 1.1.2.2 skrll #ifdef INET6 56 1.1.2.2 skrll #include <netinet/ip6.h> 57 1.1.2.2 skrll #include <netipsec/ipsec6.h> 58 1.1.2.2 skrll #endif 59 1.1.2.2 skrll 60 1.1.2.2 skrll #include <netipsec/key.h> 61 1.1.2.2 skrll #include <netipsec/key_debug.h> 62 1.1.2.2 skrll 63 1.1.2.2 skrll /* 64 1.1.2.2 skrll * Initialize a TCP-MD5 SA. Called when the SA is being set up. 65 1.1.2.2 skrll * 66 1.1.2.2 skrll * We don't need to set up the tdb prefixed fields, as we don't use the 67 1.1.2.2 skrll * opencrypto code; we just perform a key length check. 68 1.1.2.2 skrll * 69 1.1.2.2 skrll * XXX: Currently we only allow a single 'magic' SPI to be used. 70 1.1.2.2 skrll * 71 1.1.2.2 skrll * This allows per-host granularity without affecting the userland 72 1.1.2.2 skrll * interface, which is a simple socket option toggle switch, 73 1.1.2.2 skrll * TCP_SIGNATURE_ENABLE. 74 1.1.2.2 skrll * 75 1.1.2.2 skrll * To allow per-service granularity requires that we have a means 76 1.1.2.2 skrll * of mapping port to SPI. The mandated way of doing this is to 77 1.1.2.2 skrll * use SPD entries to specify packet flows which get the TCP-MD5 78 1.1.2.2 skrll * treatment, however the code to do this is currently unstable 79 1.1.2.2 skrll * and unsuitable for production use. 80 1.1.2.2 skrll * 81 1.1.2.2 skrll * Therefore we use this compromise in the meantime. 82 1.1.2.2 skrll */ 83 1.1.2.2 skrll static int 84 1.1.2.2 skrll tcpsignature_init(struct secasvar *sav, struct xformsw *xsp) 85 1.1.2.2 skrll { 86 1.1.2.2 skrll int keylen; 87 1.1.2.2 skrll 88 1.1.2.2 skrll if (sav->spi != htonl(TCP_SIG_SPI)) { 89 1.1.2.2 skrll DPRINTF(("%s: SPI %x must be TCP_SIG_SPI (0x1000)\n", 90 1.1.2.2 skrll __func__, sav->alg_auth)); 91 1.1.2.2 skrll return (EINVAL); 92 1.1.2.2 skrll } 93 1.1.2.2 skrll if (sav->alg_auth != SADB_X_AALG_TCP_MD5) { 94 1.1.2.2 skrll DPRINTF(("%s: unsupported authentication algorithm %u\n", 95 1.1.2.2 skrll __func__, sav->alg_auth)); 96 1.1.2.2 skrll return (EINVAL); 97 1.1.2.2 skrll } 98 1.1.2.2 skrll if (sav->key_auth == NULL) { 99 1.1.2.2 skrll DPRINTF(("%s: no authentication key present\n", __func__)); 100 1.1.2.2 skrll return (EINVAL); 101 1.1.2.2 skrll } 102 1.1.2.2 skrll keylen = _KEYLEN(sav->key_auth); 103 1.1.2.2 skrll if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) { 104 1.1.2.2 skrll DPRINTF(("%s: invalid key length %u\n", __func__, keylen)); 105 1.1.2.2 skrll return (EINVAL); 106 1.1.2.2 skrll } 107 1.1.2.2 skrll 108 1.1.2.2 skrll return (0); 109 1.1.2.2 skrll } 110 1.1.2.2 skrll 111 1.1.2.2 skrll /* 112 1.1.2.2 skrll * Paranoia. 113 1.1.2.2 skrll * 114 1.1.2.2 skrll * Called when the SA is deleted. 115 1.1.2.2 skrll */ 116 1.1.2.2 skrll static int 117 1.1.2.2 skrll tcpsignature_zeroize(struct secasvar *sav) 118 1.1.2.2 skrll { 119 1.1.2.2 skrll 120 1.1.2.2 skrll if (sav->key_auth) 121 1.1.2.2 skrll bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth)); 122 1.1.2.2 skrll 123 1.1.2.2 skrll sav->tdb_cryptoid = 0; 124 1.1.2.2 skrll sav->tdb_authalgxform = NULL; 125 1.1.2.2 skrll sav->tdb_xform = NULL; 126 1.1.2.2 skrll 127 1.1.2.2 skrll return (0); 128 1.1.2.2 skrll } 129 1.1.2.2 skrll 130 1.1.2.2 skrll /* 131 1.1.2.2 skrll * Verify that an input packet passes authentication. 132 1.1.2.2 skrll * Called from the ipsec layer. 133 1.1.2.2 skrll * We do this from within tcp itself, so this routine is just a stub. 134 1.1.2.2 skrll */ 135 1.1.2.2 skrll static int 136 1.1.2.2 skrll tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip, 137 1.1.2.2 skrll int protoff) 138 1.1.2.2 skrll { 139 1.1.2.2 skrll 140 1.1.2.2 skrll return (0); 141 1.1.2.2 skrll } 142 1.1.2.2 skrll 143 1.1.2.2 skrll /* 144 1.1.2.2 skrll * Prepend the authentication header. 145 1.1.2.2 skrll * Called from the ipsec layer. 146 1.1.2.2 skrll * We do this from within tcp itself, so this routine is just a stub. 147 1.1.2.2 skrll */ 148 1.1.2.2 skrll static int 149 1.1.2.2 skrll tcpsignature_output(struct mbuf *m, struct ipsecrequest *isr, 150 1.1.2.2 skrll struct mbuf **mp, int skip, int protoff) 151 1.1.2.2 skrll { 152 1.1.2.2 skrll 153 1.1.2.2 skrll return (EINVAL); 154 1.1.2.2 skrll } 155 1.1.2.2 skrll 156 1.1.2.2 skrll static struct xformsw tcpsignature_xformsw = { 157 1.1.2.2 skrll XF_TCPSIGNATURE, XFT_AUTH, "TCPMD5", 158 1.1.2.2 skrll tcpsignature_init, tcpsignature_zeroize, 159 1.1.2.2 skrll tcpsignature_input, tcpsignature_output 160 1.1.2.2 skrll }; 161 1.1.2.2 skrll 162 1.1.2.2 skrll INITFN void 163 1.1.2.2 skrll tcpsignature_attach(void) 164 1.1.2.2 skrll { 165 1.1.2.2 skrll 166 1.1.2.2 skrll xform_register(&tcpsignature_xformsw); 167 1.1.2.2 skrll } 168 1.1.2.2 skrll 169 1.1.2.2 skrll #ifdef __FreeBSD__ 170 1.1.2.2 skrll SYSINIT(tcpsignature_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, 171 1.1.2.2 skrll tcpsignature_attach, NULL) 172 1.1.2.2 skrll 173 1.1.2.2 skrll #endif 174 1.1.2.2 skrll 175
Indexes created Mon Sep 29 21:09:56 GMT 2025