The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/jail.h

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    1 /*-
    2  * Copyright (c) 1999 Poul-Henning Kamp.
    3  * Copyright (c) 2009 James Gritton.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/9.0/sys/sys/jail.h 221362 2011-05-03 07:32:58Z trasz $
   28  */
   29 
   30 #ifndef _SYS_JAIL_H_
   31 #define _SYS_JAIL_H_
   32 
   33 #ifdef _KERNEL
   34 struct jail_v0 {
   35         u_int32_t       version;
   36         char            *path;
   37         char            *hostname;
   38         u_int32_t       ip_number;
   39 };
   40 #endif
   41 
   42 struct jail {
   43         uint32_t        version;
   44         char            *path;
   45         char            *hostname;
   46         char            *jailname;
   47         uint32_t        ip4s;
   48         uint32_t        ip6s;
   49         struct in_addr  *ip4;
   50         struct in6_addr *ip6;
   51 };
   52 #define JAIL_API_VERSION        2
   53 
   54 /*
   55  * For all xprison structs, always keep the pr_version an int and
   56  * the first variable so userspace can easily distinguish them.
   57  */
   58 #ifndef _KERNEL
   59 struct xprison_v1 {
   60         int              pr_version;
   61         int              pr_id;
   62         char             pr_path[MAXPATHLEN];
   63         char             pr_host[MAXHOSTNAMELEN];
   64         u_int32_t        pr_ip;
   65 };
   66 #endif
   67 
   68 struct xprison {
   69         int              pr_version;
   70         int              pr_id;
   71         int              pr_state;
   72         cpusetid_t       pr_cpusetid;
   73         char             pr_path[MAXPATHLEN];
   74         char             pr_host[MAXHOSTNAMELEN];
   75         char             pr_name[MAXHOSTNAMELEN];
   76         uint32_t         pr_ip4s;
   77         uint32_t         pr_ip6s;
   78 #if 0
   79         /*
   80          * sizeof(xprison) will be malloced + size needed for all
   81          * IPv4 and IPv6 addesses. Offsets are based numbers of addresses.
   82          */
   83         struct in_addr   pr_ip4[];
   84         struct in6_addr  pr_ip6[];
   85 #endif
   86 };
   87 #define XPRISON_VERSION         3
   88 
   89 #define PRISON_STATE_INVALID    0
   90 #define PRISON_STATE_ALIVE      1
   91 #define PRISON_STATE_DYING      2
   92 
   93 /*
   94  * Flags for jail_set and jail_get.
   95  */
   96 #define JAIL_CREATE     0x01    /* Create jail if it doesn't exist */
   97 #define JAIL_UPDATE     0x02    /* Update parameters of existing jail */
   98 #define JAIL_ATTACH     0x04    /* Attach to jail upon creation */
   99 #define JAIL_DYING      0x08    /* Allow getting a dying jail */
  100 #define JAIL_SET_MASK   0x0f
  101 #define JAIL_GET_MASK   0x08
  102 
  103 #define JAIL_SYS_DISABLE        0
  104 #define JAIL_SYS_NEW            1
  105 #define JAIL_SYS_INHERIT        2
  106 
  107 #ifndef _KERNEL
  108 
  109 struct iovec;
  110 
  111 int jail(struct jail *);
  112 int jail_set(struct iovec *, unsigned int, int);
  113 int jail_get(struct iovec *, unsigned int, int);
  114 int jail_attach(int);
  115 int jail_remove(int);
  116 
  117 #else /* _KERNEL */
  118 
  119 #include <sys/queue.h>
  120 #include <sys/sysctl.h>
  121 #include <sys/lock.h>
  122 #include <sys/mutex.h>
  123 #include <sys/_task.h>
  124 
  125 #define JAIL_MAX        999999
  126 
  127 #ifdef MALLOC_DECLARE
  128 MALLOC_DECLARE(M_PRISON);
  129 #endif
  130 #endif /* _KERNEL */
  131 
  132 #if defined(_KERNEL) || defined(_WANT_PRISON)
  133 
  134 #include <sys/osd.h>
  135 
  136 #define HOSTUUIDLEN     64
  137 
  138 struct racct;
  139 struct prison_racct;
  140 
  141 /*
  142  * This structure describes a prison.  It is pointed to by all struct
  143  * ucreds's of the inmates.  pr_ref keeps track of them and is used to
  144  * delete the struture when the last inmate is dead.
  145  *
  146  * Lock key:
  147  *   (a) allprison_lock
  148  *   (p) locked by pr_mtx
  149  *   (c) set only during creation before the structure is shared, no mutex
  150  *       required to read
  151  *   (d) set only during destruction of jail, no mutex needed
  152  */
  153 struct prison {
  154         TAILQ_ENTRY(prison) pr_list;                    /* (a) all prisons */
  155         int              pr_id;                         /* (c) prison id */
  156         int              pr_ref;                        /* (p) refcount */
  157         int              pr_uref;                       /* (p) user (alive) refcount */
  158         unsigned         pr_flags;                      /* (p) PR_* flags */
  159         LIST_HEAD(, prison) pr_children;                /* (a) list of child jails */
  160         LIST_ENTRY(prison) pr_sibling;                  /* (a) next in parent's list */
  161         struct prison   *pr_parent;                     /* (c) containing jail */
  162         struct mtx       pr_mtx;
  163         struct task      pr_task;                       /* (d) destroy task */
  164         struct osd       pr_osd;                        /* (p) additional data */
  165         struct cpuset   *pr_cpuset;                     /* (p) cpuset */
  166         struct vnet     *pr_vnet;                       /* (c) network stack */
  167         struct vnode    *pr_root;                       /* (c) vnode to rdir */
  168         int              pr_ip4s;                       /* (p) number of v4 IPs */
  169         int              pr_ip6s;                       /* (p) number of v6 IPs */
  170         struct in_addr  *pr_ip4;                        /* (p) v4 IPs of jail */
  171         struct in6_addr *pr_ip6;                        /* (p) v6 IPs of jail */
  172         struct prison_racct *pr_prison_racct;           /* (c) racct jail proxy */
  173         void            *pr_sparep[3];
  174         int              pr_childcount;                 /* (a) number of child jails */
  175         int              pr_childmax;                   /* (p) maximum child jails */
  176         unsigned         pr_allow;                      /* (p) PR_ALLOW_* flags */
  177         int              pr_securelevel;                /* (p) securelevel */
  178         int              pr_enforce_statfs;             /* (p) statfs permission */
  179         int              pr_spare[5];
  180         unsigned long    pr_hostid;                     /* (p) jail hostid */
  181         char             pr_name[MAXHOSTNAMELEN];       /* (p) admin jail name */
  182         char             pr_path[MAXPATHLEN];           /* (c) chroot path */
  183         char             pr_hostname[MAXHOSTNAMELEN];   /* (p) jail hostname */
  184         char             pr_domainname[MAXHOSTNAMELEN]; /* (p) jail domainname */
  185         char             pr_hostuuid[HOSTUUIDLEN];      /* (p) jail hostuuid */
  186 };
  187 
  188 struct prison_racct {
  189         LIST_ENTRY(prison_racct) prr_next;
  190         char            prr_name[MAXHOSTNAMELEN];
  191         u_int           prr_refcount;
  192         struct racct    *prr_racct;
  193 };
  194 #endif /* _KERNEL || _WANT_PRISON */
  195 
  196 #ifdef _KERNEL
  197 /* Flag bits set via options */
  198 #define PR_PERSIST      0x00000001      /* Can exist without processes */
  199 #define PR_HOST         0x00000002      /* Virtualize hostname et al */
  200 #define PR_IP4_USER     0x00000004      /* Restrict IPv4 addresses */
  201 #define PR_IP6_USER     0x00000008      /* Restrict IPv6 addresses */
  202 #define PR_VNET         0x00000010      /* Virtual network stack */
  203 #define PR_IP4_DISABLE  0x00000020      /* Disable IPv4 */
  204 #define PR_IP6_DISABLE  0x00000040      /* Disable IPv6 */
  205 #define PR_IP4_SADDRSEL 0x00000080      /* Do IPv4 src addr sel. or use the */
  206                                         /* primary jail address. */
  207 #define PR_IP6_SADDRSEL 0x00000100      /* Do IPv6 src addr sel. or use the */
  208                                         /* primary jail address. */
  209 
  210 /* Internal flag bits */
  211 #define PR_REMOVE       0x01000000      /* In process of being removed */
  212 #define PR_IP4          0x02000000      /* IPv4 restricted or disabled */
  213                                         /* by this jail or an ancestor */
  214 #define PR_IP6          0x04000000      /* IPv6 restricted or disabled */
  215                                         /* by this jail or an ancestor */
  216 
  217 /* Flags for pr_allow */
  218 #define PR_ALLOW_SET_HOSTNAME           0x0001
  219 #define PR_ALLOW_SYSVIPC                0x0002
  220 #define PR_ALLOW_RAW_SOCKETS            0x0004
  221 #define PR_ALLOW_CHFLAGS                0x0008
  222 #define PR_ALLOW_MOUNT                  0x0010
  223 #define PR_ALLOW_QUOTAS                 0x0020
  224 #define PR_ALLOW_SOCKET_AF              0x0040
  225 #define PR_ALLOW_ALL                    0x007f
  226 
  227 /*
  228  * OSD methods
  229  */
  230 #define PR_METHOD_CREATE        0
  231 #define PR_METHOD_GET           1
  232 #define PR_METHOD_SET           2
  233 #define PR_METHOD_CHECK         3
  234 #define PR_METHOD_ATTACH        4
  235 #define PR_MAXMETHOD            5
  236 
  237 /*
  238  * Lock/unlock a prison.
  239  * XXX These exist not so much for general convenience, but to be useable in
  240  *     the FOREACH_PRISON_DESCENDANT_LOCKED macro which can't handle them in
  241  *     non-function form as currently defined.
  242  */
  243 static __inline void
  244 prison_lock(struct prison *pr)
  245 {
  246 
  247         mtx_lock(&pr->pr_mtx);
  248 }
  249 
  250 static __inline void
  251 prison_unlock(struct prison *pr)
  252 {
  253 
  254         mtx_unlock(&pr->pr_mtx);
  255 }
  256 
  257 /* Traverse a prison's immediate children. */
  258 #define FOREACH_PRISON_CHILD(ppr, cpr)                                  \
  259         LIST_FOREACH(cpr, &(ppr)->pr_children, pr_sibling)
  260 
  261 /*
  262  * Preorder traversal of all of a prison's descendants.
  263  * This ugly loop allows the macro to be followed by a single block
  264  * as expected in a looping primitive.
  265  */
  266 #define FOREACH_PRISON_DESCENDANT(ppr, cpr, descend)                    \
  267         for ((cpr) = (ppr), (descend) = 1;                              \
  268             ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))   \
  269               ? LIST_FIRST(&(cpr)->pr_children)                         \
  270               : ((cpr) == (ppr)                                         \
  271                  ? NULL                                                 \
  272                  : (((descend) = LIST_NEXT(cpr, pr_sibling) != NULL)    \
  273                     ? LIST_NEXT(cpr, pr_sibling)                        \
  274                     : (cpr)->pr_parent))));)                            \
  275                 if (!(descend))                                         \
  276                         ;                                               \
  277                 else
  278 
  279 /*
  280  * As above, but lock descendants on the way down and unlock on the way up.
  281  */
  282 #define FOREACH_PRISON_DESCENDANT_LOCKED(ppr, cpr, descend)             \
  283         for ((cpr) = (ppr), (descend) = 1;                              \
  284             ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))   \
  285               ? LIST_FIRST(&(cpr)->pr_children)                         \
  286               : ((cpr) == (ppr)                                         \
  287                  ? NULL                                                 \
  288                  : ((prison_unlock(cpr),                                \
  289                     (descend) = LIST_NEXT(cpr, pr_sibling) != NULL)     \
  290                     ? LIST_NEXT(cpr, pr_sibling)                        \
  291                     : (cpr)->pr_parent))));)                            \
  292                 if ((descend) ? (prison_lock(cpr), 0) : 1)              \
  293                         ;                                               \
  294                 else
  295 
  296 /*
  297  * As above, but also keep track of the level descended to.
  298  */
  299 #define FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(ppr, cpr, descend, level)\
  300         for ((cpr) = (ppr), (descend) = 1, (level) = 0;                 \
  301             ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))   \
  302               ? (level++, LIST_FIRST(&(cpr)->pr_children))              \
  303               : ((cpr) == (ppr)                                         \
  304                  ? NULL                                                 \
  305                  : ((prison_unlock(cpr),                                \
  306                     (descend) = LIST_NEXT(cpr, pr_sibling) != NULL)     \
  307                     ? LIST_NEXT(cpr, pr_sibling)                        \
  308                     : (level--, (cpr)->pr_parent)))));)                 \
  309                 if ((descend) ? (prison_lock(cpr), 0) : 1)              \
  310                         ;                                               \
  311                 else
  312 
  313 /*
  314  * Attributes of the physical system, and the root of the jail tree.
  315  */
  316 extern struct   prison prison0;
  317 
  318 TAILQ_HEAD(prisonlist, prison);
  319 extern struct   prisonlist allprison;
  320 extern struct   sx allprison_lock;
  321 
  322 /*
  323  * Sysctls to describe jail parameters.
  324  */
  325 SYSCTL_DECL(_security_jail_param);
  326 
  327 #define SYSCTL_JAIL_PARAM(module, param, type, fmt, descr)              \
  328     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,        \
  329         (type) | CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_param, fmt, descr)
  330 #define SYSCTL_JAIL_PARAM_STRING(module, param, access, len, descr)     \
  331     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,        \
  332         CTLTYPE_STRING | CTLFLAG_MPSAFE | (access), NULL, len,          \
  333         sysctl_jail_param, "A", descr)
  334 #define SYSCTL_JAIL_PARAM_STRUCT(module, param, access, len, fmt, descr)\
  335     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,        \
  336         CTLTYPE_STRUCT | CTLFLAG_MPSAFE | (access), NULL, len,          \
  337         sysctl_jail_param, fmt, descr)
  338 #define SYSCTL_JAIL_PARAM_NODE(module, descr)                           \
  339     SYSCTL_NODE(_security_jail_param, OID_AUTO, module, 0, 0, descr)
  340 #define SYSCTL_JAIL_PARAM_SYS_NODE(module, access, descr)               \
  341     SYSCTL_JAIL_PARAM_NODE(module, descr);                              \
  342     SYSCTL_JAIL_PARAM(_##module, , CTLTYPE_INT | (access), "E,jailsys", \
  343         descr)
  344 
  345 /*
  346  * Kernel support functions for jail().
  347  */
  348 struct ucred;
  349 struct mount;
  350 struct sockaddr;
  351 struct statfs;
  352 int jailed(struct ucred *cred);
  353 int jailed_without_vnet(struct ucred *);
  354 void getcredhostname(struct ucred *, char *, size_t);
  355 void getcreddomainname(struct ucred *, char *, size_t);
  356 void getcredhostuuid(struct ucred *, char *, size_t);
  357 void getcredhostid(struct ucred *, unsigned long *);
  358 int prison_allow(struct ucred *, unsigned);
  359 int prison_check(struct ucred *cred1, struct ucred *cred2);
  360 int prison_owns_vnet(struct ucred *);
  361 int prison_canseemount(struct ucred *cred, struct mount *mp);
  362 void prison_enforce_statfs(struct ucred *cred, struct mount *mp,
  363     struct statfs *sp);
  364 struct prison *prison_find(int prid);
  365 struct prison *prison_find_child(struct prison *, int);
  366 struct prison *prison_find_name(struct prison *, const char *);
  367 int prison_flag(struct ucred *, unsigned);
  368 void prison_free(struct prison *pr);
  369 void prison_free_locked(struct prison *pr);
  370 void prison_hold(struct prison *pr);
  371 void prison_hold_locked(struct prison *pr);
  372 void prison_proc_hold(struct prison *);
  373 void prison_proc_free(struct prison *);
  374 int prison_ischild(struct prison *, struct prison *);
  375 int prison_equal_ip4(struct prison *, struct prison *);
  376 int prison_get_ip4(struct ucred *cred, struct in_addr *ia);
  377 int prison_local_ip4(struct ucred *cred, struct in_addr *ia);
  378 int prison_remote_ip4(struct ucred *cred, struct in_addr *ia);
  379 int prison_check_ip4(struct ucred *cred, struct in_addr *ia);
  380 int prison_saddrsel_ip4(struct ucred *, struct in_addr *);
  381 #ifdef INET6
  382 int prison_equal_ip6(struct prison *, struct prison *);
  383 int prison_get_ip6(struct ucred *, struct in6_addr *);
  384 int prison_local_ip6(struct ucred *, struct in6_addr *, int);
  385 int prison_remote_ip6(struct ucred *, struct in6_addr *);
  386 int prison_check_ip6(struct ucred *, struct in6_addr *);
  387 int prison_saddrsel_ip6(struct ucred *, struct in6_addr *);
  388 #endif
  389 int prison_check_af(struct ucred *cred, int af);
  390 int prison_if(struct ucred *cred, struct sockaddr *sa);
  391 char *prison_name(struct prison *, struct prison *);
  392 int prison_priv_check(struct ucred *cred, int priv);
  393 int sysctl_jail_param(SYSCTL_HANDLER_ARGS);
  394 void prison_racct_foreach(void (*callback)(struct racct *racct,
  395     void *arg2, void *arg3), void *arg2, void *arg3);
  396 struct prison_racct *prison_racct_find(const char *name);
  397 void prison_racct_hold(struct prison_racct *prr);
  398 void prison_racct_free(struct prison_racct *prr);
  399 
  400 #endif /* _KERNEL */
  401 #endif /* !_SYS_JAIL_H_ */

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