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: releng/11.2/sys/netinet6/in6_jail.c 316944 2017-04-14 22:02:08Z smh $");
   31 
   32 #include "opt_compat.h"
   33 #include "opt_ddb.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/types.h>
   39 #include <sys/kernel.h>
   40 #include <sys/systm.h>
   41 #include <sys/errno.h>
   42 #include <sys/sysproto.h>
   43 #include <sys/malloc.h>
   44 #include <sys/osd.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/taskqueue.h>
   48 #include <sys/fcntl.h>
   49 #include <sys/jail.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/racct.h>
   53 #include <sys/refcount.h>
   54 #include <sys/sx.h>
   55 #include <sys/sysent.h>
   56 #include <sys/namei.h>
   57 #include <sys/mount.h>
   58 #include <sys/queue.h>
   59 #include <sys/socket.h>
   60 #include <sys/syscallsubr.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/vnode.h>
   63 
   64 #include <net/if.h>
   65 #include <net/vnet.h>
   66 
   67 #include <netinet/in.h>
   68 
   69 int
   70 prison_qcmp_v6(const void *ip1, const void *ip2)
   71 {
   72         const struct in6_addr *ia6a, *ia6b;
   73         int i, rc;
   74 
   75         ia6a = (const struct in6_addr *)ip1;
   76         ia6b = (const struct in6_addr *)ip2;
   77 
   78         rc = 0;
   79         for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
   80                 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
   81                         rc = 1;
   82                 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
   83                         rc = -1;
   84         }
   85         return (rc);
   86 }
   87 
   88 int
   89 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
   90 {
   91         int ii, ij, used;
   92         struct prison *ppr;
   93 
   94         ppr = pr->pr_parent;
   95         if (!(pr->pr_flags & PR_IP6_USER)) {
   96                 /* This has no user settings, so just copy the parent's list. */
   97                 if (pr->pr_ip6s < ppr->pr_ip6s) {
   98                         /*
   99                          * There's no room for the parent's list.  Use the
  100                          * new list buffer, which is assumed to be big enough
  101                          * (if it was passed).  If there's no buffer, try to
  102                          * allocate one.
  103                          */
  104                         used = 1;
  105                         if (newip6 == NULL) {
  106                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
  107                                     M_PRISON, M_NOWAIT);
  108                                 if (newip6 != NULL)
  109                                         used = 0;
  110                         }
  111                         if (newip6 != NULL) {
  112                                 bcopy(ppr->pr_ip6, newip6,
  113                                     ppr->pr_ip6s * sizeof(*newip6));
  114                                 free(pr->pr_ip6, M_PRISON);
  115                                 pr->pr_ip6 = newip6;
  116                                 pr->pr_ip6s = ppr->pr_ip6s;
  117                         }
  118                         return (used);
  119                 }
  120                 pr->pr_ip6s = ppr->pr_ip6s;
  121                 if (pr->pr_ip6s > 0)
  122                         bcopy(ppr->pr_ip6, pr->pr_ip6,
  123                             pr->pr_ip6s * sizeof(*newip6));
  124                 else if (pr->pr_ip6 != NULL) {
  125                         free(pr->pr_ip6, M_PRISON);
  126                         pr->pr_ip6 = NULL;
  127                 }
  128         } else if (pr->pr_ip6s > 0) {
  129                 /* Remove addresses that aren't in the parent. */
  130                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
  131                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
  132                             &ppr->pr_ip6[ij]))
  133                                 break;
  134                 if (ij < ppr->pr_ip6s)
  135                         ii = 1;
  136                 else {
  137                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
  138                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
  139                         ii = 0;
  140                 }
  141                 for (ij = 1; ii < pr->pr_ip6s; ) {
  142                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
  143                             &ppr->pr_ip6[0])) {
  144                                 ii++;
  145                                 continue;
  146                         }
  147                         switch (ij >= ppr->pr_ip6s ? -1 :
  148                                 prison_qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
  149                         case -1:
  150                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
  151                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
  152                                 break;
  153                         case 0:
  154                                 ii++;
  155                                 ij++;
  156                                 break;
  157                         case 1:
  158                                 ij++;
  159                                 break;
  160                         }
  161                 }
  162                 if (pr->pr_ip6s == 0) {
  163                         free(pr->pr_ip6, M_PRISON);
  164                         pr->pr_ip6 = NULL;
  165                 }
  166         }
  167         return 0;
  168 }
  169 
  170 /*
  171  * Pass back primary IPv6 address for this jail.
  172  *
  173  * If not restricted return success but do not alter the address.  Caller has
  174  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
  175  *
  176  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
  177  */
  178 int
  179 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
  180 {
  181         struct prison *pr;
  182 
  183         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  184         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  185 
  186         pr = cred->cr_prison;
  187         if (!(pr->pr_flags & PR_IP6))
  188                 return (0);
  189         mtx_lock(&pr->pr_mtx);
  190         if (!(pr->pr_flags & PR_IP6)) {
  191                 mtx_unlock(&pr->pr_mtx);
  192                 return (0);
  193         }
  194         if (pr->pr_ip6 == NULL) {
  195                 mtx_unlock(&pr->pr_mtx);
  196                 return (EAFNOSUPPORT);
  197         }
  198 
  199         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  200         mtx_unlock(&pr->pr_mtx);
  201         return (0);
  202 }
  203 
  204 /*
  205  * Return 1 if we should do proper source address selection or are not jailed.
  206  * We will return 0 if we should bypass source address selection in favour
  207  * of the primary jail IPv6 address. Only in this case *ia will be updated and
  208  * returned in NBO.
  209  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
  210  */
  211 int
  212 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
  213 {
  214         struct prison *pr;
  215         struct in6_addr lia6;
  216         int error;
  217 
  218         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  219         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  220 
  221         if (!jailed(cred))
  222                 return (1);
  223 
  224         pr = cred->cr_prison;
  225         if (pr->pr_flags & PR_IP6_SADDRSEL)
  226                 return (1);
  227 
  228         lia6 = in6addr_any;
  229         error = prison_get_ip6(cred, &lia6);
  230         if (error)
  231                 return (error);
  232         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
  233                 return (1);
  234 
  235         bcopy(&lia6, ia6, sizeof(struct in6_addr));
  236         return (0);
  237 }
  238 
  239 /*
  240  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
  241  */
  242 int
  243 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
  244 {
  245 
  246         if (pr1 == pr2)
  247                 return (1);
  248 
  249         while (pr1 != &prison0 &&
  250 #ifdef VIMAGE
  251                !(pr1->pr_flags & PR_VNET) &&
  252 #endif
  253                !(pr1->pr_flags & PR_IP6_USER))
  254                 pr1 = pr1->pr_parent;
  255         while (pr2 != &prison0 &&
  256 #ifdef VIMAGE
  257                !(pr2->pr_flags & PR_VNET) &&
  258 #endif
  259                !(pr2->pr_flags & PR_IP6_USER))
  260                 pr2 = pr2->pr_parent;
  261         return (pr1 == pr2);
  262 }
  263 
  264 /*
  265  * Make sure our (source) address is set to something meaningful to this jail.
  266  *
  267  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
  268  * when needed while binding.
  269  *
  270  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
  271  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
  272  * doesn't allow IPv6.
  273  */
  274 int
  275 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
  276 {
  277         struct prison *pr;
  278         int error;
  279 
  280         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  281         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  282 
  283         pr = cred->cr_prison;
  284         if (!(pr->pr_flags & PR_IP6))
  285                 return (0);
  286         mtx_lock(&pr->pr_mtx);
  287         if (!(pr->pr_flags & PR_IP6)) {
  288                 mtx_unlock(&pr->pr_mtx);
  289                 return (0);
  290         }
  291         if (pr->pr_ip6 == NULL) {
  292                 mtx_unlock(&pr->pr_mtx);
  293                 return (EAFNOSUPPORT);
  294         }
  295 
  296         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
  297                 /*
  298                  * In case there is only 1 IPv6 address, and v6only is true,
  299                  * then bind directly.
  300                  */
  301                 if (v6only != 0 && pr->pr_ip6s == 1)
  302                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  303                 mtx_unlock(&pr->pr_mtx);
  304                 return (0);
  305         }
  306 
  307         error = prison_check_ip6_locked(pr, ia6);
  308         if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
  309                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  310                 error = 0;
  311         }
  312 
  313         mtx_unlock(&pr->pr_mtx);
  314         return (error);
  315 }
  316 
  317 /*
  318  * Rewrite destination address in case we will connect to loopback address.
  319  *
  320  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
  321  */
  322 int
  323 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
  324 {
  325         struct prison *pr;
  326 
  327         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  328         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  329 
  330         pr = cred->cr_prison;
  331         if (!(pr->pr_flags & PR_IP6))
  332                 return (0);
  333         mtx_lock(&pr->pr_mtx);
  334         if (!(pr->pr_flags & PR_IP6)) {
  335                 mtx_unlock(&pr->pr_mtx);
  336                 return (0);
  337         }
  338         if (pr->pr_ip6 == NULL) {
  339                 mtx_unlock(&pr->pr_mtx);
  340                 return (EAFNOSUPPORT);
  341         }
  342 
  343         if (IN6_IS_ADDR_LOOPBACK(ia6) &&
  344             prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
  345                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
  346                 mtx_unlock(&pr->pr_mtx);
  347                 return (0);
  348         }
  349 
  350         /*
  351          * Return success because nothing had to be changed.
  352          */
  353         mtx_unlock(&pr->pr_mtx);
  354         return (0);
  355 }
  356 
  357 /*
  358  * Check if given address belongs to the jail referenced by cred/prison.
  359  *
  360  * Returns 0 if address belongs to jail,
  361  * EADDRNOTAVAIL if the address doesn't belong to the jail.
  362  */
  363 int
  364 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
  365 {
  366         int i, a, z, d;
  367 
  368         /*
  369          * Check the primary IP.
  370          */
  371         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
  372                 return (0);
  373 
  374         /*
  375          * All the other IPs are sorted so we can do a binary search.
  376          */
  377         a = 0;
  378         z = pr->pr_ip6s - 2;
  379         while (a <= z) {
  380                 i = (a + z) / 2;
  381                 d = prison_qcmp_v6(&pr->pr_ip6[i+1], ia6);
  382                 if (d > 0)
  383                         z = i - 1;
  384                 else if (d < 0)
  385                         a = i + 1;
  386                 else
  387                         return (0);
  388         }
  389 
  390         return (EADDRNOTAVAIL);
  391 }
  392 
  393 int
  394 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
  395 {
  396         struct prison *pr;
  397         int error;
  398 
  399         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  400         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
  401 
  402         pr = cred->cr_prison;
  403         if (!(pr->pr_flags & PR_IP6))
  404                 return (0);
  405         mtx_lock(&pr->pr_mtx);
  406         if (!(pr->pr_flags & PR_IP6)) {
  407                 mtx_unlock(&pr->pr_mtx);
  408                 return (0);
  409         }
  410         if (pr->pr_ip6 == NULL) {
  411                 mtx_unlock(&pr->pr_mtx);
  412                 return (EAFNOSUPPORT);
  413         }
  414 
  415         error = prison_check_ip6_locked(pr, ia6);
  416         mtx_unlock(&pr->pr_mtx);
  417         return (error);
  418 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/in6_jail.c

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