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

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