xnu-344.tar.gz

[apple/xnu.git] / bsd / netinet6 / esp_output.c

diff --git a/bsd/netinet6/esp_output.c b/bsd/netinet6/esp_output.c
index 26a1b0ca6208868115e9c2ef91ccdf01f15521b0..9ada8fc7c17a57da7e1a469a69b237c81bef0a88 100644 (file)
--- a/bsd/netinet6/esp_output.c
+++ b/bsd/netinet6/esp_output.c
@@ -1,4 +1,5 @@
-/*     $KAME: esp_output.c,v 1.17 2000/02/22 14:04:15 itojun Exp $     */
+/*     $FreeBSD: src/sys/netinet6/esp_output.c,v 1.1.2.2 2001/07/03 11:01:50 ume Exp $ */
+/*     $KAME: esp_output.c,v 1.43 2001/03/01 07:10:45 itojun Exp $     */

 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.


@@ -30,9 +31,6 @@
  */
 
 #define _IP_VHL
  */
 
 #define _IP_VHL

-#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
-#include "opt_inet.h"
-#endif

 
 /*
  * RFC1827/2406 Encapsulated Security Payload.
 
 /*
  * RFC1827/2406 Encapsulated Security Payload.


@@ -66,11 +64,19 @@
 #endif
 
 #include <netinet6/ipsec.h>
 #endif
 
 #include <netinet6/ipsec.h>

+#if INET6
+#include <netinet6/ipsec6.h>
+#endif

 #include <netinet6/ah.h>
 #include <netinet6/ah.h>

+#if INET6
+#include <netinet6/ah6.h>
+#endif

 #include <netinet6/esp.h>
 #include <netinet6/esp.h>

+#if INET6
+#include <netinet6/esp6.h>
+#endif

 #include <netkey/key.h>
 #include <netkey/keydb.h>
 #include <netkey/key.h>
 #include <netkey/keydb.h>

-#include <netkey/key_debug.h>

 
 #include <net/net_osdep.h>
 
 
 #include <net/net_osdep.h>
 


@@ -85,7 +91,8 @@ esp_hdrsiz(isr)
        struct ipsecrequest *isr;
 {
        struct secasvar *sav;
        struct ipsecrequest *isr;
 {
        struct secasvar *sav;

-       struct esp_algorithm *algo;
+       const struct esp_algorithm *algo;
+       const struct ah_algorithm *aalgo;

        size_t ivlen;
        size_t authlen;
        size_t hdrsiz;
        size_t ivlen;
        size_t authlen;
        size_t hdrsiz;


@@ -106,7 +113,7 @@ esp_hdrsiz(isr)
                goto estimate;
 
        /* we need transport mode ESP. */
                goto estimate;
 
        /* we need transport mode ESP. */

-       algo = &esp_algorithms[sav->alg_enc];
+       algo = esp_algorithm_lookup(sav->alg_enc);

        if (!algo)
                goto estimate;
        ivlen = sav->ivlen;
        if (!algo)
                goto estimate;
        ivlen = sav->ivlen;


@@ -125,8 +132,9 @@ esp_hdrsiz(isr)
                hdrsiz = sizeof(struct esp) + ivlen + 9;
        } else {
                /* RFC 2406 */
                hdrsiz = sizeof(struct esp) + ivlen + 9;
        } else {
                /* RFC 2406 */

-               if (sav->replay && sav->alg_auth && sav->key_auth)
-                       authlen = (*ah_algorithms[sav->alg_auth].sumsiz)(sav);
+               aalgo = ah_algorithm_lookup(sav->alg_auth);
+               if (aalgo && sav->replay && sav->key_auth)
+                       authlen = (aalgo->sumsiz)(sav);

                else
                        authlen = 0;
                hdrsiz = sizeof(struct newesp) + ivlen + 9 + authlen;
                else
                        authlen = 0;
                hdrsiz = sizeof(struct newesp) + ivlen + 9 + authlen;


@@ -138,12 +146,12 @@ esp_hdrsiz(isr)
        /*
         * ASSUMING:
         *      sizeof(struct newesp) > sizeof(struct esp).
        /*
         * ASSUMING:
         *      sizeof(struct newesp) > sizeof(struct esp).

-        *      8 = ivlen for CBC mode (RFC2451).
+        *      esp_max_ivlen() = max ivlen for CBC mode

         *      9 = (maximum padding length without random padding length)
         *         + (Pad Length field) + (Next Header field).
         *      16 = maximum ICV we support.
         */
         *      9 = (maximum padding length without random padding length)
         *         + (Pad Length field) + (Next Header field).
         *      16 = maximum ICV we support.
         */

-       return sizeof(struct newesp) + 8 + 9 + 16;
+       return sizeof(struct newesp) + esp_max_ivlen() + 9 + 16;

 }
 
 /*
 }
 
 /*


@@ -179,7 +187,7 @@ esp_output(m, nexthdrp, md, isr, af)
        struct esp *esp;
        struct esptail *esptail;
        struct secasvar *sav = isr->sav;
        struct esp *esp;
        struct esptail *esptail;
        struct secasvar *sav = isr->sav;

-       struct esp_algorithm *algo;
+       const struct esp_algorithm *algo;

        u_int32_t spi;
        u_int8_t nxt = 0;
        size_t plen;    /*payload length to be encrypted*/
        u_int32_t spi;
        u_int8_t nxt = 0;
        size_t plen;    /*payload length to be encrypted*/


@@ -188,16 +196,19 @@ esp_output(m, nexthdrp, md, isr, af)
        int afnumber;
        size_t extendsiz;
        int error = 0;
        int afnumber;
        size_t extendsiz;
        int error = 0;

+       struct ipsecstat *stat;

 
        switch (af) {
 #if INET
        case AF_INET:
                afnumber = 4;
 
        switch (af) {
 #if INET
        case AF_INET:
                afnumber = 4;

+               stat = &ipsecstat;

                break;
 #endif
 #if INET6
        case AF_INET6:
                afnumber = 6;
                break;
 #endif
 #if INET6
        case AF_INET6:
                afnumber = 6;

+               stat = &ipsec6stat;

                break;
 #endif
        default:
                break;
 #endif
        default:


@@ -220,28 +231,31 @@ esp_output(m, nexthdrp, md, isr, af)
                                (u_int32_t)ntohl(ip->ip_dst.s_addr),
                                (u_int32_t)ntohl(sav->spi)));
                        ipsecstat.out_inval++;
                                (u_int32_t)ntohl(ip->ip_dst.s_addr),
                                (u_int32_t)ntohl(sav->spi)));
                        ipsecstat.out_inval++;

-                       m_freem(m);
-                       return EINVAL;
+                       break;

                    }
 #endif /*INET*/
 #if INET6
                case AF_INET6:
                    }
 #endif /*INET*/
 #if INET6
                case AF_INET6:

-                   {
-                       struct ip6_hdr *ip6;
-
-                       ip6 = mtod(m, struct ip6_hdr *);

                        ipseclog((LOG_DEBUG, "esp6_output: internal error: "
                                "sav->replay is null: SPI=%u\n",
                                (u_int32_t)ntohl(sav->spi)));
                        ipsec6stat.out_inval++;
                        ipseclog((LOG_DEBUG, "esp6_output: internal error: "
                                "sav->replay is null: SPI=%u\n",
                                (u_int32_t)ntohl(sav->spi)));
                        ipsec6stat.out_inval++;

-                       m_freem(m);
-                       return EINVAL;
-                   }
+                       break;

 #endif /*INET6*/
 #endif /*INET6*/

+               default:
+                       panic("esp_output: should not reach here");

                }
                }

+               m_freem(m);
+               return EINVAL;

        }
 
        }
 

-       algo = &esp_algorithms[sav->alg_enc];   /*XXX*/
+       algo = esp_algorithm_lookup(sav->alg_enc);
+       if (!algo) {
+               ipseclog((LOG_ERR, "esp_output: unsupported algorithm: "
+                   "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
+               m_freem(m);
+               return EINVAL;
+       }

        spi = sav->spi;
        ivlen = sav->ivlen;
        /* should be okey */
        spi = sav->spi;
        ivlen = sav->ivlen;
        /* should be okey */


@@ -326,7 +340,7 @@ esp_output(m, nexthdrp, md, isr, af)
         * before: IP ... payload
         * after:  IP ... ESP IV payload
         */
         * before: IP ... payload
         * after:  IP ... ESP IV payload
         */

-       if (M_LEADINGSPACE(md) < esphlen) {
+       if (M_LEADINGSPACE(md) < esphlen || (md->m_flags & M_EXT) != 0) {

                MGET(n, M_DONTWAIT, MT_DATA);
                if (!n) {
                        m_freem(m);
                MGET(n, M_DONTWAIT, MT_DATA);
                if (!n) {
                        m_freem(m);


@@ -381,7 +395,7 @@ esp_output(m, nexthdrp, md, isr, af)
                                ipseclog((LOG_WARNING,
                                    "replay counter overflowed. %s\n",
                                    ipsec_logsastr(sav)));
                                ipseclog((LOG_WARNING,
                                    "replay counter overflowed. %s\n",
                                    ipsec_logsastr(sav)));

-                               ipsecstat.out_inval++;
+                               stat->out_inval++;

                                m_freem(m);
                                return EINVAL;
                        }
                                m_freem(m);
                                return EINVAL;
                        }


@@ -397,7 +411,6 @@ esp_output(m, nexthdrp, md, isr, af)
     {
        /*
         * find the last mbuf. make some room for ESP trailer.
     {
        /*
         * find the last mbuf. make some room for ESP trailer.

-        * XXX new-esp authentication data

         */
 #if INET
        struct ip *ip = NULL;
         */
 #if INET
        struct ip *ip = NULL;


@@ -405,6 +418,7 @@ esp_output(m, nexthdrp, md, isr, af)
        size_t padbound;
        u_char *extend;
        int i;
        size_t padbound;
        u_char *extend;
        int i;

+       int randpadmax;

 
        if (algo->padbound)
                padbound = algo->padbound;
 
        if (algo->padbound)
                padbound = algo->padbound;


@@ -418,13 +432,62 @@ esp_output(m, nexthdrp, md, isr, af)
        if (extendsiz == 1)
                extendsiz = padbound + 1;
 
        if (extendsiz == 1)
                extendsiz = padbound + 1;
 

+       /* random padding */
+       switch (af) {
+#if INET
+       case AF_INET:
+               randpadmax = ip4_esp_randpad;
+               break;
+#endif
+#if INET6
+       case AF_INET6:
+               randpadmax = ip6_esp_randpad;
+               break;
+#endif
+       default:
+               randpadmax = -1;
+               break;
+       }
+       if (randpadmax < 0 || plen + extendsiz >= randpadmax)
+               ;
+       else {
+               int n;
+
+               /* round */
+               randpadmax = (randpadmax / padbound) * padbound;
+               n = (randpadmax - plen + extendsiz) / padbound;
+
+               if (n > 0)
+                       n = (random() % n) * padbound;
+               else
+                       n = 0;
+
+               /*
+                * make sure we do not pad too much.
+                * MLEN limitation comes from the trailer attachment
+                * code below.
+                * 256 limitation comes from sequential padding.
+                * also, the 1-octet length field in ESP trailer imposes
+                * limitation (but is less strict than sequential padding
+                * as length field do not count the last 2 octets).
+                */
+               if (extendsiz + n <= MLEN && extendsiz + n < 256)
+                       extendsiz += n;
+       }
+
+#if DIAGNOSTIC
+       if (extendsiz > MLEN || extendsiz >= 256)
+               panic("extendsiz too big in esp_output");
+#endif
+

        n = m;
        while (n->m_next)
                n = n->m_next;
 
        /*
        n = m;
        while (n->m_next)
                n = n->m_next;
 
        /*

-        * if M_EXT, the external part may be shared among
-        * two consequtive TCP packets.
+        * if M_EXT, the external mbuf data may be shared among
+        * two consequtive TCP packets, and it may be unsafe to use the
+        * trailing space.

         */
        if (!(n->m_flags & M_EXT) && extendsiz < M_TRAILINGSPACE(n)) {
                extend = mtod(n, u_char *) + n->m_len;
         */
        if (!(n->m_flags & M_EXT) && extendsiz < M_TRAILINGSPACE(n)) {
                extend = mtod(n, u_char *) + n->m_len;


@@ -450,8 +513,7 @@ esp_output(m, nexthdrp, md, isr, af)
        }
        switch (sav->flags & SADB_X_EXT_PMASK) {
        case SADB_X_EXT_PRAND:
        }
        switch (sav->flags & SADB_X_EXT_PMASK) {
        case SADB_X_EXT_PRAND:

-               for (i = 0; i < extendsiz; i++)
-                       extend[i] = random() & 0xff;
+               key_randomfill(extend, extendsiz);

                break;
        case SADB_X_EXT_PZERO:
                bzero(extend, extendsiz);
                break;
        case SADB_X_EXT_PZERO:
                bzero(extend, extendsiz);


@@ -493,6 +555,16 @@ esp_output(m, nexthdrp, md, isr, af)
        }
     }
 
        }
     }
 

+       /*
+        * pre-compute and cache intermediate key
+        */
+       error = esp_schedule(algo, sav);
+       if (error) {
+               m_freem(m);
+               stat->out_inval++;
+               goto fail;
+       }
+

        /*
         * encrypt the packet, based on security association
         * and the algorithm specified.
        /*
         * encrypt the packet, based on security association
         * and the algorithm specified.


@@ -500,20 +572,9 @@ esp_output(m, nexthdrp, md, isr, af)
        if (!algo->encrypt)
                panic("internal error: no encrypt function");
        if ((*algo->encrypt)(m, espoff, plen + extendsiz, sav, algo, ivlen)) {
        if (!algo->encrypt)
                panic("internal error: no encrypt function");
        if ((*algo->encrypt)(m, espoff, plen + extendsiz, sav, algo, ivlen)) {

+               /* m is already freed */

                ipseclog((LOG_ERR, "packet encryption failure\n"));
                ipseclog((LOG_ERR, "packet encryption failure\n"));

-               m_freem(m);
-               switch (af) {
-#if INET
-               case AF_INET:
-                       ipsecstat.out_inval++;
-                       break;
-#endif
-#if INET6
-               case AF_INET6:
-                       ipsec6stat.out_inval++;
-                       break;
-#endif
-               }
+               stat->out_inval++;

                error = EINVAL;
                goto fail;
        }
                error = EINVAL;
                goto fail;
        }


@@ -525,21 +586,33 @@ esp_output(m, nexthdrp, md, isr, af)
                goto noantireplay;
        if (!sav->key_auth)
                goto noantireplay;
                goto noantireplay;
        if (!sav->key_auth)
                goto noantireplay;

-       if (!sav->alg_auth)
+       if (sav->key_auth == SADB_AALG_NONE)

                goto noantireplay;
                goto noantireplay;

+

     {
     {

+       const struct ah_algorithm *aalgo;

        u_char authbuf[AH_MAXSUMSIZE];
        struct mbuf *n;
        u_char *p;
        size_t siz;
        u_char authbuf[AH_MAXSUMSIZE];
        struct mbuf *n;
        u_char *p;
        size_t siz;

+#if INET

        struct ip *ip;
        struct ip *ip;

+#endif

 
 

-       siz = (((*ah_algorithms[sav->alg_auth].sumsiz)(sav) + 3) & ~(4 - 1));
+       aalgo = ah_algorithm_lookup(sav->alg_auth);
+       if (!aalgo)
+               goto noantireplay;
+       siz = ((aalgo->sumsiz)(sav) + 3) & ~(4 - 1);

        if (AH_MAXSUMSIZE < siz)
                panic("assertion failed for AH_MAXSUMSIZE");
 
        if (AH_MAXSUMSIZE < siz)
                panic("assertion failed for AH_MAXSUMSIZE");
 

-       if (esp_auth(m, espoff, m->m_pkthdr.len - espoff, sav, authbuf))
-               goto noantireplay;
+       if (esp_auth(m, espoff, m->m_pkthdr.len - espoff, sav, authbuf)) {
+               ipseclog((LOG_ERR, "ESP checksum generation failure\n"));
+               m_freem(m);
+               error = EINVAL;
+               stat->out_inval++;
+               goto fail;
+       }

 
        n = m;
        while (n->m_next)
 
        n = m;
        while (n->m_next)


@@ -598,32 +671,9 @@ noantireplay:
        if (!m) {
                ipseclog((LOG_ERR,
                    "NULL mbuf after encryption in esp%d_output", afnumber));
        if (!m) {
                ipseclog((LOG_ERR,
                    "NULL mbuf after encryption in esp%d_output", afnumber));

-       } else {
-               switch (af) {
-#if INET
-               case AF_INET:
-                       ipsecstat.out_success++;
-                       break;
-#endif
-#if INET6
-               case AF_INET6:
-                       ipsec6stat.out_success++;
-                       break;
-#endif
-               }
-       }
-       switch (af) {
-#if INET
-       case AF_INET:
-               ipsecstat.out_esphist[sav->alg_enc]++;
-               break;
-#endif
-#if INET6
-       case AF_INET6:
-               ipsec6stat.out_esphist[sav->alg_enc]++;
-               break;
-#endif
-       }
+       } else
+               stat->out_success++;
+       stat->out_esphist[sav->alg_enc]++;

        key_sa_recordxfer(sav, m);
        return 0;
 
        key_sa_recordxfer(sav, m);
        return 0;
 


@@ -645,7 +695,7 @@ esp4_output(m, isr)
        if (m->m_len < sizeof(struct ip)) {
                ipseclog((LOG_DEBUG, "esp4_output: first mbuf too short\n"));
                m_freem(m);
        if (m->m_len < sizeof(struct ip)) {
                ipseclog((LOG_DEBUG, "esp4_output: first mbuf too short\n"));
                m_freem(m);

-               return NULL;
+               return 0;

        }
        ip = mtod(m, struct ip *);
        /* XXX assumes that m->m_next points to payload */
        }
        ip = mtod(m, struct ip *);
        /* XXX assumes that m->m_next points to payload */


@@ -664,7 +714,7 @@ esp6_output(m, nexthdrp, md, isr)
        if (m->m_len < sizeof(struct ip6_hdr)) {
                ipseclog((LOG_DEBUG, "esp6_output: first mbuf too short\n"));
                m_freem(m);
        if (m->m_len < sizeof(struct ip6_hdr)) {
                ipseclog((LOG_DEBUG, "esp6_output: first mbuf too short\n"));
                m_freem(m);

-               return NULL;
+               return 0;

        }
        return esp_output(m, nexthdrp, md, isr, AF_INET6);
 }
        }
        return esp_output(m, nexthdrp, md, isr, AF_INET6);
 }