The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform_tcp.c

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    1 /*      $NetBSD: xform_tcp.c,v 1.4 2007/12/11 12:40:10 lukem Exp $ */
    2 /*      $FreeBSD: sys/netipsec/xform_tcp.c,v 1.1.2.1 2004/02/14 22:24:09 bms Exp $ */
    3 
    4 /*
    5  * Copyright (c) 2003 Bruce M. Simpson <bms@spc.org>
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *   notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *   notice, this list of conditions and the following disclaimer in the
   15  *   documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *   derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* TCP MD5 Signature Option (RFC2385) */
   32 
   33 #include <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: xform_tcp.c,v 1.4 2007/12/11 12:40:10 lukem Exp $");
   35 
   36 #include "opt_inet.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/lock.h>
   42 #include <sys/socket.h>
   43 #include <sys/kernel.h>
   44 #include <sys/protosw.h>
   45 #include <sys/sysctl.h>
   46 
   47 #include <netinet/in.h>
   48 #include <netinet/in_systm.h>
   49 #include <netinet/ip.h>
   50 #include <netinet/ip_var.h>
   51 #include <netinet/tcp_timer.h>
   52 #include <netinet/tcp.h>
   53 #include <netinet/tcp_var.h>
   54 
   55 #include <net/route.h>
   56 #include <netipsec/ipsec.h>
   57 #include <netipsec/xform.h>
   58 
   59 #ifdef INET6
   60 #include <netinet/ip6.h>
   61 #include <netipsec/ipsec6.h>
   62 #endif
   63 
   64 #include <netipsec/key.h>
   65 #include <netipsec/key_debug.h>
   66 
   67 /*
   68  * Initialize a TCP-MD5 SA. Called when the SA is being set up.
   69  *
   70  * We don't need to set up the tdb prefixed fields, as we don't use the
   71  * opencrypto code; we just perform a key length check.
   72  *
   73  * XXX: Currently we only allow a single 'magic' SPI to be used.
   74  *
   75  * This allows per-host granularity without affecting the userland
   76  * interface, which is a simple socket option toggle switch,
   77  * TCP_SIGNATURE_ENABLE.
   78  *
   79  * To allow per-service granularity requires that we have a means
   80  * of mapping port to SPI. The mandated way of doing this is to
   81  * use SPD entries to specify packet flows which get the TCP-MD5
   82  * treatment, however the code to do this is currently unstable
   83  * and unsuitable for production use.
   84  *
   85  * Therefore we use this compromise in the meantime.
   86  */
   87 static int
   88 tcpsignature_init(struct secasvar *sav, struct xformsw *xsp)
   89 {
   90         int keylen;
   91 
   92         if (sav->spi != htonl(TCP_SIG_SPI)) {
   93                 DPRINTF(("%s: SPI %x must be TCP_SIG_SPI (0x1000)\n",
   94                     __func__, sav->alg_auth));
   95                 return (EINVAL);
   96         }
   97         if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
   98                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
   99                     __func__, sav->alg_auth));
  100                 return (EINVAL);
  101         }
  102         if (sav->key_auth == NULL) {
  103                 DPRINTF(("%s: no authentication key present\n", __func__));
  104                 return (EINVAL);
  105         }
  106         keylen = _KEYLEN(sav->key_auth);
  107         if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) {
  108                 DPRINTF(("%s: invalid key length %u\n", __func__, keylen));
  109                 return (EINVAL);
  110         }
  111 
  112         return (0);
  113 }
  114 
  115 /*
  116  * Paranoia.
  117  *
  118  * Called when the SA is deleted.
  119  */
  120 static int
  121 tcpsignature_zeroize(struct secasvar *sav)
  122 {
  123 
  124         if (sav->key_auth)
  125                 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
  126 
  127         sav->tdb_cryptoid = 0;
  128         sav->tdb_authalgxform = NULL;
  129         sav->tdb_xform = NULL;
  130 
  131         return (0);
  132 }
  133 
  134 /*
  135  * Verify that an input packet passes authentication.
  136  * Called from the ipsec layer.
  137  * We do this from within tcp itself, so this routine is just a stub.
  138  */
  139 static int
  140 tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip,
  141     int protoff)
  142 {
  143 
  144         return (0);
  145 }
  146 
  147 /*
  148  * Prepend the authentication header.
  149  * Called from the ipsec layer.
  150  * We do this from within tcp itself, so this routine is just a stub.
  151  */
  152 static int
  153 tcpsignature_output(struct mbuf *m, struct ipsecrequest *isr,
  154     struct mbuf **mp, int skip, int protoff)
  155 {
  156 
  157         return (EINVAL);
  158 }
  159 
  160 static struct xformsw tcpsignature_xformsw = {
  161         XF_TCPSIGNATURE,        XFT_AUTH,               "TCPMD5",
  162         tcpsignature_init,      tcpsignature_zeroize,
  163         tcpsignature_input,     tcpsignature_output
  164 };
  165 
  166 INITFN void
  167 tcpsignature_attach(void)
  168 {
  169 
  170         xform_register(&tcpsignature_xformsw);
  171 }
  172 
  173 #ifdef __FreeBSD__
  174 SYSINIT(tcpsignature_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST,
  175     tcpsignature_attach, NULL)
  176 
  177 #endif
  178 

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