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 1.25 2022/05/22 11:39:08 riastradh Exp $ */
    2 /*      $FreeBSD: 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 /*
   32  * TCP MD5 Signature Option (RFC2385). Dummy code, everything is handled
   33  * in TCP directly.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __KERNEL_RCSID(0, "$NetBSD: xform_tcp.c,v 1.25 2022/05/22 11:39:08 riastradh Exp $");
   38 
   39 #if defined(_KERNEL_OPT)
   40 #include "opt_inet.h"
   41 #endif
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/kernel.h>
   47 
   48 #include <netinet/in.h>
   49 #include <netinet/in_systm.h>
   50 #include <netinet/ip.h>
   51 #include <netinet/ip_var.h>
   52 #ifdef TCP_SIGNATURE
   53 #include <netinet/tcp_timer.h>
   54 #include <netinet/tcp.h>
   55 #include <netinet/tcp_var.h>
   56 #endif
   57 
   58 #include <netipsec/ipsec.h>
   59 #include <netipsec/xform.h>
   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, const struct xformsw *xsp)
   86 {
   87         int keylen;
   88 
   89         if (sav->spi != htonl(TCP_SIG_SPI)) {
   90                 DPRINTF("SPI %x must be TCP_SIG_SPI (0x1000)\n", sav->alg_auth);
   91                 return EINVAL;
   92         }
   93         if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
   94                 DPRINTF("unsupported authentication algorithm %u\n",
   95                     sav->alg_auth);
   96                 return EINVAL;
   97         }
   98         if (sav->key_auth == NULL) {
   99                 DPRINTF("no authentication key present\n");
  100                 return EINVAL;
  101         }
  102         keylen = _KEYLEN(sav->key_auth);
  103         if ((keylen < TCP_KEYLEN_MIN) || (keylen > TCP_KEYLEN_MAX)) {
  104                 DPRINTF("invalid key length %u\n", keylen);
  105                 return EINVAL;
  106         }
  107 
  108         return 0;
  109 }
  110 
  111 static void
  112 tcpsignature_zeroize(struct secasvar *sav)
  113 {
  114         if (sav->key_auth) {
  115                 explicit_memset(_KEYBUF(sav->key_auth), 0,
  116                     _KEYLEN(sav->key_auth));
  117         }
  118 
  119         sav->tdb_cryptoid = 0;
  120         sav->tdb_authalgxform = NULL;
  121         sav->tdb_xform = NULL;
  122 }
  123 
  124 static int
  125 tcpsignature_input(struct mbuf *m, struct secasvar *sav, int skip,
  126     int protoff)
  127 {
  128         panic("%s: should not have been called", __func__);
  129 }
  130 
  131 static int
  132 tcpsignature_output(struct mbuf *m, const struct ipsecrequest *isr,
  133     struct secasvar *sav, int skip, int protoff, int flags)
  134 {
  135         panic("%s: should not have been called", __func__);
  136 }
  137 
  138 static struct xformsw tcpsignature_xformsw = {
  139         .xf_type        = XF_TCPSIGNATURE,
  140         .xf_flags       = XFT_AUTH,
  141         .xf_name        = "TCPMD5",
  142         .xf_init        = tcpsignature_init,
  143         .xf_zeroize     = tcpsignature_zeroize,
  144         .xf_input       = tcpsignature_input,
  145         .xf_output      = tcpsignature_output,
  146         .xf_next        = NULL,
  147 };
  148 
  149 void
  150 tcpsignature_attach(void)
  151 {
  152         xform_register(&tcpsignature_xformsw);
  153 }

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