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 /*      $FreeBSD$ */
    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 <netipsec/ipsec.h>
   52 #include <netipsec/xform.h>
   53 
   54 #ifdef INET6
   55 #include <netinet/ip6.h>
   56 #include <netipsec/ipsec6.h>
   57 #endif
   58 
   59 #include <netipsec/key.h>
   60 #include <netipsec/key_debug.h>
   61 
   62 /*
   63  * Initialize a TCP-MD5 SA. Called when the SA is being set up.
   64  *
   65  * We don't need to set up the tdb prefixed fields, as we don't use the
   66  * opencrypto code; we just perform a key length check.
   67  *
   68  * XXX: Currently we only allow a single 'magic' SPI to be used.
   69  *
   70  * This allows per-host granularity without affecting the userland
   71  * interface, which is a simple socket option toggle switch,
   72  * TCP_SIGNATURE_ENABLE.
   73  *
   74  * To allow per-service granularity requires that we have a means
   75  * of mapping port to SPI. The mandated way of doing this is to
   76  * use SPD entries to specify packet flows which get the TCP-MD5
   77  * treatment, however the code to do this is currently unstable
   78  * and unsuitable for production use.
   79  *
   80  * Therefore we use this compromise in the meantime.
   81  */
   82 static int
   83 tcpsignature_init(struct secasvar *sav, struct xformsw *xsp)
   84 {
   85         int keylen;
   86 
   87         if (sav->spi != htonl(TCP_SIG_SPI)) {
   88                 DPRINTF(("%s: SPI must be TCP_SIG_SPI (0x1000)\n",
   89                     __func__));
   90                 return (EINVAL);
   91         }
   92         if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
   93                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
   94                     __func__, sav->alg_auth));
   95                 return (EINVAL);
   96         }
   97         if (sav->key_auth == NULL) {
   98                 DPRINTF(("%s: no authentication key present\n", __func__));
   99                 return (EINVAL);
  100         }
  101         keylen = _KEYLEN(sav->key_auth);
  102         if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) {
  103                 DPRINTF(("%s: invalid key length %u\n", __func__, keylen));
  104                 return (EINVAL);
  105         }
  106 
  107         return (0);
  108 }
  109 
  110 /*
  111  * Paranoia.
  112  *
  113  * Called when the SA is deleted.
  114  */
  115 static int
  116 tcpsignature_zeroize(struct secasvar *sav)
  117 {
  118 
  119         if (sav->key_auth)
  120                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  121 
  122         sav->tdb_cryptoid = 0;
  123         sav->tdb_authalgxform = NULL;
  124         sav->tdb_xform = NULL;
  125 
  126         return (0);
  127 }
  128 
  129 /*
  130  * Verify that an input packet passes authentication.
  131  * Called from the ipsec layer.
  132  * We do this from within tcp itself, so this routine is just a stub.
  133  */
  134 static int
  135 tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip,
  136     int protoff)
  137 {
  138 
  139         return (0);
  140 }
  141 
  142 /*
  143  * Prepend the authentication header.
  144  * Called from the ipsec layer.
  145  * We do this from within tcp itself, so this routine is just a stub.
  146  */
  147 static int
  148 tcpsignature_output(struct mbuf *m, struct ipsecrequest *isr,
  149     struct mbuf **mp, int skip, int protoff)
  150 {
  151 
  152         return (EINVAL);
  153 }
  154 
  155 static struct xformsw tcpsignature_xformsw = {
  156         XF_TCPSIGNATURE,        XFT_AUTH,               "TCPMD5",
  157         tcpsignature_init,      tcpsignature_zeroize,
  158         tcpsignature_input,     tcpsignature_output
  159 };
  160 
  161 static void
  162 tcpsignature_attach(void)
  163 {
  164 
  165         xform_register(&tcpsignature_xformsw);
  166 }
  167 
  168 SYSINIT(tcpsignature_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST,
  169     tcpsignature_attach, NULL);

Cache object: 9cf475796020ec4e9840fe1a354f6829


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