in_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_v4(const void *ip1, const void *ip2)
   70 {
   71         in_addr_t iaa, iab;
   72 
   73         /*
   74          * We need to compare in HBO here to get the list sorted as expected
   75          * by the result of the code.  Sorting NBO addresses gives you
   76          * interesting results.  If you do not understand, do not try.
   77          */
   78         iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
   79         iab = ntohl(((const struct in_addr *)ip2)->s_addr);
   80 
   81         /*
   82          * Do not simply return the difference of the two numbers, the int is
   83          * not wide enough.
   84          */
   85         if (iaa > iab)
   86                 return (1);
   87         else if (iaa < iab)
   88                 return (-1);
   89         else
   90                 return (0);
   91 }
   92 
   93 /*
   94  * Restrict a prison's IP address list with its parent's, possibly replacing
   95  * it.  Return true if the replacement buffer was used (or would have been).
   96  */
   97 int
   98 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
   99 {
  100         int ii, ij, used;
  101         struct prison *ppr;
  102 
  103         ppr = pr->pr_parent;
  104         if (!(pr->pr_flags & PR_IP4_USER)) {
  105                 /* This has no user settings, so just copy the parent's list. */
  106                 if (pr->pr_ip4s < ppr->pr_ip4s) {
  107                         /*
  108                          * There's no room for the parent's list.  Use the
  109                          * new list buffer, which is assumed to be big enough
  110                          * (if it was passed).  If there's no buffer, try to
  111                          * allocate one.
  112                          */
  113                         used = 1;
  114                         if (newip4 == NULL) {
  115                                 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
  116                                     M_PRISON, M_NOWAIT);
  117                                 if (newip4 != NULL)
  118                                         used = 0;
  119                         }
  120                         if (newip4 != NULL) {
  121                                 bcopy(ppr->pr_ip4, newip4,
  122                                     ppr->pr_ip4s * sizeof(*newip4));
  123                                 free(pr->pr_ip4, M_PRISON);
  124                                 pr->pr_ip4 = newip4;
  125                                 pr->pr_ip4s = ppr->pr_ip4s;
  126                         }
  127                         return (used);
  128                 }
  129                 pr->pr_ip4s = ppr->pr_ip4s;
  130                 if (pr->pr_ip4s > 0)
  131                         bcopy(ppr->pr_ip4, pr->pr_ip4,
  132                             pr->pr_ip4s * sizeof(*newip4));
  133                 else if (pr->pr_ip4 != NULL) {
  134                         free(pr->pr_ip4, M_PRISON);
  135                         pr->pr_ip4 = NULL;
  136                 }
  137         } else if (pr->pr_ip4s > 0) {
  138                 /* Remove addresses that aren't in the parent. */
  139                 for (ij = 0; ij < ppr->pr_ip4s; ij++)
  140                         if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
  141                                 break;
  142                 if (ij < ppr->pr_ip4s)
  143                         ii = 1;
  144                 else {
  145                         bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
  146                             --pr->pr_ip4s * sizeof(*pr->pr_ip4));
  147                         ii = 0;
  148                 }
  149                 for (ij = 1; ii < pr->pr_ip4s; ) {
  150                         if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
  151                                 ii++;
  152                                 continue;
  153                         }
  154                         switch (ij >= ppr->pr_ip4s ? -1 :
  155                                 prison_qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
  156                         case -1:
  157                                 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
  158                                     (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
  159                                 break;
  160                         case 0:
  161                                 ii++;
  162                                 ij++;
  163                                 break;
  164                         case 1:
  165                                 ij++;
  166                                 break;
  167                         }
  168                 }
  169                 if (pr->pr_ip4s == 0) {
  170                         free(pr->pr_ip4, M_PRISON);
  171                         pr->pr_ip4 = NULL;
  172                 }
  173         }
  174         return (0);
  175 }
  176 
  177 /*
  178  * Pass back primary IPv4 address of this jail.
  179  *
  180  * If not restricted return success but do not alter the address.  Caller has
  181  * to make sure to initialize it correctly (e.g. INADDR_ANY).
  182  *
  183  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
  184  * Address returned in NBO.
  185  */
  186 int
  187 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
  188 {
  189         struct prison *pr;
  190 
  191         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  192         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
  193 
  194         pr = cred->cr_prison;
  195         if (!(pr->pr_flags & PR_IP4))
  196                 return (0);
  197         mtx_lock(&pr->pr_mtx);
  198         if (!(pr->pr_flags & PR_IP4)) {
  199                 mtx_unlock(&pr->pr_mtx);
  200                 return (0);
  201         }
  202         if (pr->pr_ip4 == NULL) {
  203                 mtx_unlock(&pr->pr_mtx);
  204                 return (EAFNOSUPPORT);
  205         }
  206 
  207         ia->s_addr = pr->pr_ip4[0].s_addr;
  208         mtx_unlock(&pr->pr_mtx);
  209         return (0);
  210 }
  211 
  212 /*
  213  * Return 1 if we should do proper source address selection or are not jailed.
  214  * We will return 0 if we should bypass source address selection in favour
  215  * of the primary jail IPv4 address. Only in this case *ia will be updated and
  216  * returned in NBO.
  217  * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
  218  */
  219 int
  220 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
  221 {
  222         struct prison *pr;
  223         struct in_addr lia;
  224         int error;
  225 
  226         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  227         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
  228 
  229         if (!jailed(cred))
  230                 return (1);
  231 
  232         pr = cred->cr_prison;
  233         if (pr->pr_flags & PR_IP4_SADDRSEL)
  234                 return (1);
  235 
  236         lia.s_addr = INADDR_ANY;
  237         error = prison_get_ip4(cred, &lia);
  238         if (error)
  239                 return (error);
  240         if (lia.s_addr == INADDR_ANY)
  241                 return (1);
  242 
  243         ia->s_addr = lia.s_addr;
  244         return (0);
  245 }
  246 
  247 /*
  248  * Return true if pr1 and pr2 have the same IPv4 address restrictions.
  249  */
  250 int
  251 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
  252 {
  253 
  254         if (pr1 == pr2)
  255                 return (1);
  256 
  257         /*
  258          * No need to lock since the PR_IP4_USER flag can't be altered for
  259          * existing prisons.
  260          */
  261         while (pr1 != &prison0 &&
  262 #ifdef VIMAGE
  263                !(pr1->pr_flags & PR_VNET) &&
  264 #endif
  265                !(pr1->pr_flags & PR_IP4_USER))
  266                 pr1 = pr1->pr_parent;
  267         while (pr2 != &prison0 &&
  268 #ifdef VIMAGE
  269                !(pr2->pr_flags & PR_VNET) &&
  270 #endif
  271                !(pr2->pr_flags & PR_IP4_USER))
  272                 pr2 = pr2->pr_parent;
  273         return (pr1 == pr2);
  274 }
  275 
  276 /*
  277  * Make sure our (source) address is set to something meaningful to this
  278  * jail.
  279  *
  280  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
  281  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
  282  * doesn't allow IPv4.  Address passed in in NBO and returned in NBO.
  283  */
  284 int
  285 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
  286 {
  287         struct prison *pr;
  288         struct in_addr ia0;
  289         int error;
  290 
  291         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  292         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
  293 
  294         pr = cred->cr_prison;
  295         if (!(pr->pr_flags & PR_IP4))
  296                 return (0);
  297         mtx_lock(&pr->pr_mtx);
  298         if (!(pr->pr_flags & PR_IP4)) {
  299                 mtx_unlock(&pr->pr_mtx);
  300                 return (0);
  301         }
  302         if (pr->pr_ip4 == NULL) {
  303                 mtx_unlock(&pr->pr_mtx);
  304                 return (EAFNOSUPPORT);
  305         }
  306 
  307         ia0.s_addr = ntohl(ia->s_addr);
  308 
  309         if (ia0.s_addr == INADDR_ANY) {
  310                 /*
  311                  * In case there is only 1 IPv4 address, bind directly.
  312                  */
  313                 if (pr->pr_ip4s == 1)
  314                         ia->s_addr = pr->pr_ip4[0].s_addr;
  315                 mtx_unlock(&pr->pr_mtx);
  316                 return (0);
  317         }
  318 
  319         error = prison_check_ip4_locked(pr, ia);
  320         if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) {
  321                 ia->s_addr = pr->pr_ip4[0].s_addr;
  322                 error = 0;
  323         }
  324 
  325         mtx_unlock(&pr->pr_mtx);
  326         return (error);
  327 }
  328 
  329 /*
  330  * Rewrite destination address in case we will connect to loopback address.
  331  *
  332  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
  333  * Address passed in in NBO and returned in NBO.
  334  */
  335 int
  336 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
  337 {
  338         struct prison *pr;
  339 
  340         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  341         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
  342 
  343         pr = cred->cr_prison;
  344         if (!(pr->pr_flags & PR_IP4))
  345                 return (0);
  346         mtx_lock(&pr->pr_mtx);
  347         if (!(pr->pr_flags & PR_IP4)) {
  348                 mtx_unlock(&pr->pr_mtx);
  349                 return (0);
  350         }
  351         if (pr->pr_ip4 == NULL) {
  352                 mtx_unlock(&pr->pr_mtx);
  353                 return (EAFNOSUPPORT);
  354         }
  355 
  356         if (ntohl(ia->s_addr) == INADDR_LOOPBACK &&
  357             prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) {
  358                 ia->s_addr = pr->pr_ip4[0].s_addr;
  359                 mtx_unlock(&pr->pr_mtx);
  360                 return (0);
  361         }
  362 
  363         /*
  364          * Return success because nothing had to be changed.
  365          */
  366         mtx_unlock(&pr->pr_mtx);
  367         return (0);
  368 }
  369 
  370 /*
  371  * Check if given address belongs to the jail referenced by cred/prison.
  372  *
  373  * Returns 0 if address belongs to jail,
  374  * EADDRNOTAVAIL if the address doesn't belong to the jail.
  375  */
  376 int
  377 prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia)
  378 {
  379         int i, a, z, d;
  380 
  381         /*
  382          * Check the primary IP.
  383          */
  384         if (pr->pr_ip4[0].s_addr == ia->s_addr)
  385                 return (0);
  386 
  387         /*
  388          * All the other IPs are sorted so we can do a binary search.
  389          */
  390         a = 0;
  391         z = pr->pr_ip4s - 2;
  392         while (a <= z) {
  393                 i = (a + z) / 2;
  394                 d = prison_qcmp_v4(&pr->pr_ip4[i+1], ia);
  395                 if (d > 0)
  396                         z = i - 1;
  397                 else if (d < 0)
  398                         a = i + 1;
  399                 else
  400                         return (0);
  401         }
  402 
  403         return (EADDRNOTAVAIL);
  404 }
  405 
  406 int
  407 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
  408 {
  409         struct prison *pr;
  410         int error;
  411 
  412         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
  413         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
  414 
  415         pr = cred->cr_prison;
  416         if (!(pr->pr_flags & PR_IP4))
  417                 return (0);
  418         mtx_lock(&pr->pr_mtx);
  419         if (!(pr->pr_flags & PR_IP4)) {
  420                 mtx_unlock(&pr->pr_mtx);
  421                 return (0);
  422         }
  423         if (pr->pr_ip4 == NULL) {
  424                 mtx_unlock(&pr->pr_mtx);
  425                 return (EAFNOSUPPORT);
  426         }
  427 
  428         error = prison_check_ip4_locked(pr, ia);
  429         mtx_unlock(&pr->pr_mtx);
  430         return (error);
  431 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_jail.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_jail.c
