in6_jail.c

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    1 /*-
    2  * Copyright (c) 1999 Poul-Henning Kamp.
    3  * Copyright (c) 2008 Bjoern A. Zeeb.
    4  * Copyright (c) 2009 James Gritton.
    5  * All rights reserved.
    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  * 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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_ddb.h"
   33 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/types.h>
   38 #include <sys/kernel.h>
   39 #include <sys/systm.h>
   40 #include <sys/errno.h>
   41 #include <sys/sysproto.h>
   42 #include <sys/malloc.h>
   43 #include <sys/osd.h>
   44 #include <sys/priv.h>
   45 #include <sys/proc.h>
   46 #include <sys/taskqueue.h>
   47 #include <sys/fcntl.h>
   48 #include <sys/jail.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/racct.h>
   52 #include <sys/refcount.h>
   53 #include <sys/sx.h>
   54 #include <sys/sysent.h>
   55 #include <sys/namei.h>
   56 #include <sys/mount.h>
   57 #include <sys/queue.h>
   58 #include <sys/socket.h>
   59 #include <sys/syscallsubr.h>
   60 #include <sys/sysctl.h>
   61 #include <sys/vnode.h>
   62 
   63 #include <net/if.h>
   64 #include <net/vnet.h>
   65 
   66 #include <netinet/in.h>
   67 
   68 int
   69 prison_qcmp_v6(const void *ip1, const void *ip2)
   70 {
   71         const struct in6_addr *ia6a, *ia6b;
   72         int i, rc;
   73 
   74         ia6a = (const struct in6_addr *)ip1;
   75         ia6b = (const struct in6_addr *)ip2;
   76 
   77         rc = 0;
   78         for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
   79                 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
   80                         rc = 1;
   81                 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
   82                         rc = -1;
   83         }
   84         return (rc);
   85 }
   86 
   87 int
   88 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
   89 {
   90         int ii, ij, used;
   91         struct prison *ppr;
   92 
   93         ppr = pr->pr_parent;
   94         if (!(pr->pr_flags & PR_IP6_USER)) {
   95                 /* This has no user settings, so just copy the parent's list. */
   96                 if (pr->pr_ip6s < ppr->pr_ip6s) {
   97                         /*
   98                          * There's no room for the parent's list.  Use the
   99                          * new list buffer, which is assumed to be big enough
  100                          * (if it was passed).  If there's no buffer, try to
  101                          * allocate one.
  102                          */
  103                         used = 1;
  104                         if (newip6 == NULL) {
  105                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
  106                                     M_PRISON, M_NOWAIT);
  107                                 if (newip6 != NULL)
  108                                         used = 0;
  109                         }
  110                         if (newip6 != NULL) {
  111                                 bcopy(ppr->pr_ip6, newip6,
  112                                     ppr->pr_ip6s * sizeof(*newip6));
  113                                 free(pr->pr_ip6, M_PRISON);
  114                                 pr->pr_ip6 = newip6;
  115                                 pr->pr_ip6s = ppr->pr_ip6s;
  116                         }
  117                         return (used);
  118                 }
  119                 pr->pr_ip6s = ppr->pr_ip6s;
  120                 if (pr->pr_ip6s > 0)
  121                         bcopy(ppr->pr_ip6, pr->pr_ip6,
  122                             pr->pr_ip6s * sizeof(*newip6));
  123                 else if (pr->pr_ip6 != NULL) {
  124                         free(pr->pr_ip6, M_PRISON);
  125                         pr->pr_ip6 = NULL;
  126                 }
  127         } else if (pr->pr_ip6s > 0) {
  128                 /* Remove addresses that aren't in the parent. */
  129                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
  130                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
  131                             &ppr->pr_ip6[ij]))
  132                                 break;
  133                 if (ij < ppr->pr_ip6s)
  134                         ii = 1;
  135                 else {
  136                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
  137                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
  138                         ii = 0;
  139                 }
  140                 for (ij = 1; ii < pr->pr_ip6s; ) {
  141                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
  142                             &ppr->pr_ip6[0])) {
  143                                 ii++;
  144                                 continue;
  145                         }
  146                         switch (ij >= ppr->pr_ip6s ? -1 :
  147                                 prison_qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
  148                         case -1:
  149                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
  150                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
  151                                 break;
  152                         case 0:
  153                                 ii++;
  154                                 ij++;
  155                                 break;
  156                         case 1:
  157                                 ij++;
  158                                 break;
  159                         }
  160                 }
  161                 if (pr->pr_ip6s == 0) {
  162                         free(pr->pr_ip6, M_PRISON);
  163                         pr->pr_ip6 = NULL;
  164                 }
  165         }
  166         return 0;
  167 }
  168 
  169 /*
  170  * Pass back primary IPv6 address for this jail.
  171  *
  172  * If not restricted return success but do not alter the address.  Caller has
  173  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
  174  *
  175  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
  176  */
  177 int
  178 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
  179 {
  180         struct prison *pr;
  181 
  182         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  183         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  184 
  185         pr = cred->cr_prison;
  186         if (!(pr->pr_flags & PR_IP6))
  187                 return (0);
  188         mtx_lock(&pr->pr_mtx);
  189         if (!(pr->pr_flags & PR_IP6)) {
  190                 mtx_unlock(&pr->pr_mtx);
  191                 return (0);
  192         }
  193         if (pr->pr_ip6 == NULL) {
  194                 mtx_unlock(&pr->pr_mtx);
  195                 return (EAFNOSUPPORT);
  196         }
  197 
  198         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  199         mtx_unlock(&pr->pr_mtx);
  200         return (0);
  201 }
  202 
  203 /*
  204  * Return 1 if we should do proper source address selection or are not jailed.
  205  * We will return 0 if we should bypass source address selection in favour
  206  * of the primary jail IPv6 address. Only in this case *ia will be updated and
  207  * returned in NBO.
  208  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
  209  */
  210 int
  211 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
  212 {
  213         struct prison *pr;
  214         struct in6_addr lia6;
  215         int error;
  216 
  217         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  218         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  219 
  220         if (!jailed(cred))
  221                 return (1);
  222 
  223         pr = cred->cr_prison;
  224         if (pr->pr_flags & PR_IP6_SADDRSEL)
  225                 return (1);
  226 
  227         lia6 = in6addr_any;
  228         error = prison_get_ip6(cred, &lia6);
  229         if (error)
  230                 return (error);
  231         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
  232                 return (1);
  233 
  234         bcopy(&lia6, ia6, sizeof(struct in6_addr));
  235         return (0);
  236 }
  237 
  238 /*
  239  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
  240  */
  241 int
  242 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
  243 {
  244 
  245         if (pr1 == pr2)
  246                 return (1);
  247 
  248         while (pr1 != &prison0 &&
  249 #ifdef VIMAGE
  250                !(pr1->pr_flags & PR_VNET) &&
  251 #endif
  252                !(pr1->pr_flags & PR_IP6_USER))
  253                 pr1 = pr1->pr_parent;
  254         while (pr2 != &prison0 &&
  255 #ifdef VIMAGE
  256                !(pr2->pr_flags & PR_VNET) &&
  257 #endif
  258                !(pr2->pr_flags & PR_IP6_USER))
  259                 pr2 = pr2->pr_parent;
  260         return (pr1 == pr2);
  261 }
  262 
  263 /*
  264  * Make sure our (source) address is set to something meaningful to this jail.
  265  *
  266  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
  267  * when needed while binding.
  268  *
  269  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
  270  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
  271  * doesn't allow IPv6.
  272  */
  273 int
  274 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
  275 {
  276         struct prison *pr;
  277         int error;
  278 
  279         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  280         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  281 
  282         pr = cred->cr_prison;
  283         if (!(pr->pr_flags & PR_IP6))
  284                 return (0);
  285         mtx_lock(&pr->pr_mtx);
  286         if (!(pr->pr_flags & PR_IP6)) {
  287                 mtx_unlock(&pr->pr_mtx);
  288                 return (0);
  289         }
  290         if (pr->pr_ip6 == NULL) {
  291                 mtx_unlock(&pr->pr_mtx);
  292                 return (EAFNOSUPPORT);
  293         }
  294 
  295         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
  296                 /*
  297                  * In case there is only 1 IPv6 address, and v6only is true,
  298                  * then bind directly.
  299                  */
  300                 if (v6only != 0 && pr->pr_ip6s == 1)
  301                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  302                 mtx_unlock(&pr->pr_mtx);
  303                 return (0);
  304         }
  305 
  306         error = prison_check_ip6_locked(pr, ia6);
  307         if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
  308                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  309                 error = 0;
  310         }
  311 
  312         mtx_unlock(&pr->pr_mtx);
  313         return (error);
  314 }
  315 
  316 /*
  317  * Rewrite destination address in case we will connect to loopback address.
  318  *
  319  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
  320  */
  321 int
  322 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
  323 {
  324         struct prison *pr;
  325 
  326         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  327         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  328 
  329         pr = cred->cr_prison;
  330         if (!(pr->pr_flags & PR_IP6))
  331                 return (0);
  332         mtx_lock(&pr->pr_mtx);
  333         if (!(pr->pr_flags & PR_IP6)) {
  334                 mtx_unlock(&pr->pr_mtx);
  335                 return (0);
  336         }
  337         if (pr->pr_ip6 == NULL) {
  338                 mtx_unlock(&pr->pr_mtx);
  339                 return (EAFNOSUPPORT);
  340         }
  341 
  342         if (IN6_IS_ADDR_LOOPBACK(ia6) &&
  343             prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
  344                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  345                 mtx_unlock(&pr->pr_mtx);
  346                 return (0);
  347         }
  348 
  349         /*
  350          * Return success because nothing had to be changed.
  351          */
  352         mtx_unlock(&pr->pr_mtx);
  353         return (0);
  354 }
  355 
  356 /*
  357  * Check if given address belongs to the jail referenced by cred/prison.
  358  *
  359  * Returns 0 if address belongs to jail,
  360  * EADDRNOTAVAIL if the address doesn't belong to the jail.
  361  */
  362 int
  363 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
  364 {
  365         int i, a, z, d;
  366 
  367         /*
  368          * Check the primary IP.
  369          */
  370         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
  371                 return (0);
  372 
  373         /*
  374          * All the other IPs are sorted so we can do a binary search.
  375          */
  376         a = 0;
  377         z = pr->pr_ip6s - 2;
  378         while (a <= z) {
  379                 i = (a + z) / 2;
  380                 d = prison_qcmp_v6(&pr->pr_ip6[i+1], ia6);
  381                 if (d > 0)
  382                         z = i - 1;
  383                 else if (d < 0)
  384                         a = i + 1;
  385                 else
  386                         return (0);
  387         }
  388 
  389         return (EADDRNOTAVAIL);
  390 }
  391 
  392 int
  393 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
  394 {
  395         struct prison *pr;
  396         int error;
  397 
  398         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  399         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  400 
  401         pr = cred->cr_prison;
  402         if (!(pr->pr_flags & PR_IP6))
  403                 return (0);
  404         mtx_lock(&pr->pr_mtx);
  405         if (!(pr->pr_flags & PR_IP6)) {
  406                 mtx_unlock(&pr->pr_mtx);
  407                 return (0);
  408         }
  409         if (pr->pr_ip6 == NULL) {
  410                 mtx_unlock(&pr->pr_mtx);
  411                 return (EAFNOSUPPORT);
  412         }
  413 
  414         error = prison_check_ip6_locked(pr, ia6);
  415         mtx_unlock(&pr->pr_mtx);
  416         return (error);
  417 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/in6_jail.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_jail.c
