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 /*      $FreeBSD: releng/9.2/sys/netipsec/xform_tcp.c 196019 2009-08-01 19:26:27Z rwatson $ */
    2 
    3 /*-
    4  * Copyright (c) 2003 Bruce M. Simpson <bms@spc.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *   notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *   notice, this list of conditions and the following disclaimer in the
   14  *   documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *   derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 /* TCP MD5 Signature Option (RFC2385) */
   31 #include "opt_inet.h"
   32 #include "opt_inet6.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/mbuf.h>
   37 #include <sys/lock.h>
   38 #include <sys/socket.h>
   39 #include <sys/kernel.h>
   40 #include <sys/protosw.h>
   41 #include <sys/sysctl.h>
   42 
   43 #include <netinet/in.h>
   44 #include <netinet/in_systm.h>
   45 #include <netinet/ip.h>
   46 #include <netinet/ip_var.h>
   47 #include <netinet/tcp.h>
   48 #include <netinet/tcp_var.h>
   49 
   50 #include <net/route.h>
   51 #include <net/vnet.h>
   52 
   53 #include <netipsec/ipsec.h>
   54 #include <netipsec/xform.h>
   55 
   56 #ifdef INET6
   57 #include <netinet/ip6.h>
   58 #include <netipsec/ipsec6.h>
   59 #endif
   60 
   61 #include <netipsec/key.h>
   62 #include <netipsec/key_debug.h>
   63 
   64 /*
   65  * Initialize a TCP-MD5 SA. Called when the SA is being set up.
   66  *
   67  * We don't need to set up the tdb prefixed fields, as we don't use the
   68  * opencrypto code; we just perform a key length check.
   69  *
   70  * XXX: Currently we only allow a single 'magic' SPI to be used.
   71  *
   72  * This allows per-host granularity without affecting the userland
   73  * interface, which is a simple socket option toggle switch,
   74  * TCP_SIGNATURE_ENABLE.
   75  *
   76  * To allow per-service granularity requires that we have a means
   77  * of mapping port to SPI. The mandated way of doing this is to
   78  * use SPD entries to specify packet flows which get the TCP-MD5
   79  * treatment, however the code to do this is currently unstable
   80  * and unsuitable for production use.
   81  *
   82  * Therefore we use this compromise in the meantime.
   83  */
   84 static int
   85 tcpsignature_init(struct secasvar *sav, struct xformsw *xsp)
   86 {
   87         int keylen;
   88 
   89         if (sav->spi != htonl(TCP_SIG_SPI)) {
   90                 DPRINTF(("%s: SPI must be TCP_SIG_SPI (0x1000)\n",
   91                     __func__));
   92                 return (EINVAL);
   93         }
   94         if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
   95                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
   96                     __func__, sav->alg_auth));
   97                 return (EINVAL);
   98         }
   99         if (sav->key_auth == NULL) {
  100                 DPRINTF(("%s: no authentication key present\n", __func__));
  101                 return (EINVAL);
  102         }
  103         keylen = _KEYLEN(sav->key_auth);
  104         if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) {
  105                 DPRINTF(("%s: invalid key length %u\n", __func__, keylen));
  106                 return (EINVAL);
  107         }
  108 
  109         return (0);
  110 }
  111 
  112 /*
  113  * Paranoia.
  114  *
  115  * Called when the SA is deleted.
  116  */
  117 static int
  118 tcpsignature_zeroize(struct secasvar *sav)
  119 {
  120 
  121         if (sav->key_auth)
  122                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  123 
  124         sav->tdb_cryptoid = 0;
  125         sav->tdb_authalgxform = NULL;
  126         sav->tdb_xform = NULL;
  127 
  128         return (0);
  129 }
  130 
  131 /*
  132  * Verify that an input packet passes authentication.
  133  * Called from the ipsec layer.
  134  * We do this from within tcp itself, so this routine is just a stub.
  135  */
  136 static int
  137 tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip,
  138     int protoff)
  139 {
  140 
  141         return (0);
  142 }
  143 
  144 /*
  145  * Prepend the authentication header.
  146  * Called from the ipsec layer.
  147  * We do this from within tcp itself, so this routine is just a stub.
  148  */
  149 static int
  150 tcpsignature_output(struct mbuf *m, struct ipsecrequest *isr,
  151     struct mbuf **mp, int skip, int protoff)
  152 {
  153 
  154         return (EINVAL);
  155 }
  156 
  157 static struct xformsw tcpsignature_xformsw = {
  158         XF_TCPSIGNATURE,        XFT_AUTH,               "TCPMD5",
  159         tcpsignature_init,      tcpsignature_zeroize,
  160         tcpsignature_input,     tcpsignature_output
  161 };
  162 
  163 static void
  164 tcpsignature_attach(void)
  165 {
  166 
  167         xform_register(&tcpsignature_xformsw);
  168 }
  169 
  170 SYSINIT(tcpsignature_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST,
  171     tcpsignature_attach, NULL);

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