The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * ----------------------------------------------------------------------------
    3  * "THE BEER-WARE LICENSE" (Revision 42):
    4  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
    5  * can do whatever you want with this stuff. If we meet some day, and you think
    6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    7  * ----------------------------------------------------------------------------
    8  *
    9  * $FreeBSD: src/sys/sys/jail.h,v 1.8.2.2 2000/11/01 17:58:06 rwatson Exp $
   10  */
   11 
   12 #ifndef _SYS_JAIL_H_
   13 #define _SYS_JAIL_H_
   14 
   15 #ifndef _SYS_TYPES_H_
   16 #include <sys/types.h>
   17 #endif
   18 #ifndef _SYS_PARAM_H_
   19 #include <sys/param.h>
   20 #endif
   21 #ifndef _SYS_QUEUE_H_
   22 #include <sys/queue.h>
   23 #endif
   24 #ifndef _SYS_UCRED_H_
   25 #include <sys/ucred.h>
   26 #endif
   27 #ifndef _NET_IF_H_
   28 #include <net/if.h>
   29 #endif
   30 
   31 struct jail {
   32         uint32_t        version;
   33         char            *path;
   34         char            *hostname;
   35         uint32_t        n_ips;     /* Number of ips */
   36         struct sockaddr_storage *ips;
   37 };
   38 
   39 struct jail_v0 {
   40         uint32_t        version;
   41         char            *path;
   42         char            *hostname;
   43         uint32_t        ip_number;
   44 };
   45 
   46 #ifndef _KERNEL
   47 
   48 int jail(struct jail *);
   49 int jail_attach(int);
   50 
   51 #endif
   52 
   53 #ifdef _KERNEL
   54 
   55 #ifndef _SYS_NAMECACHE_H_
   56 #include <sys/namecache.h>
   57 #endif
   58 #ifndef _SYS_VARSYM_H_
   59 #include <sys/varsym.h>
   60 #endif
   61 
   62 #ifdef MALLOC_DECLARE
   63 MALLOC_DECLARE(M_PRISON);
   64 #endif
   65 
   66 #endif  /* _KERNEL */
   67 
   68 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   69 
   70 #define JAIL_MAX        999999
   71 
   72 /* Used to store the IPs of the jail */
   73 
   74 struct jail_ip_storage {
   75         struct sockaddr_storage ip;
   76         SLIST_ENTRY(jail_ip_storage) entries;
   77 };
   78 
   79 /*
   80  * This structure describes a prison.  It is pointed to by all struct
   81  * proc's of the inmates.  pr_ref keeps track of them and is used to
   82  * delete the struture when the last inmate is dead.
   83  */
   84 
   85 struct prison {
   86         LIST_ENTRY(prison) pr_list;                     /* all prisons */
   87         int             pr_id;                          /* prison id */
   88         int             pr_ref;                         /* reference count */
   89         struct nchandle pr_root;                        /* namecache entry of root */
   90         char            pr_host[MAXHOSTNAMELEN];        /* host name */
   91         SLIST_HEAD(iplist, jail_ip_storage) pr_ips;     /* list of IP addresses */
   92         struct sockaddr_in      *local_ip4;             /* cache for a loopback ipv4 address */
   93         struct sockaddr_in      *nonlocal_ip4;          /* cache for a non loopback ipv4 address */
   94         struct sockaddr_in6     *local_ip6;             /* cache for a loopback ipv6 address */
   95         struct sockaddr_in6     *nonlocal_ip6;          /* cache for a non loopback ipv6 address */
   96         void            *pr_linux;                      /* Linux ABI emulation */
   97         int              pr_securelevel;                /* jail securelevel */
   98         struct varsymset pr_varsymset;                  /* jail varsyms */
   99 };
  100 
  101 /*
  102  * Sysctl-set variables that determine global jail policy
  103  */
  104 extern int      jail_set_hostname_allowed;
  105 extern int      jail_socket_unixiproute_only;
  106 extern int      jail_sysvipc_allowed;
  107 extern int      jail_chflags_allowed;
  108 extern int      jail_allow_raw_sockets;
  109 
  110 void    prison_hold(struct prison *);
  111 void    prison_free(struct prison *);
  112 int     jailed_ip(struct prison *, struct sockaddr *);
  113 struct sockaddr *
  114         prison_get_local(struct prison *pr, sa_family_t, struct sockaddr *);
  115 struct sockaddr *
  116         prison_get_nonlocal(struct prison *pr, sa_family_t, struct sockaddr *);
  117 int     prison_priv_check(struct ucred *cred, int priv);
  118 
  119 /*
  120  * Return 1 if the passed credential is in a jail, otherwise 0.
  121  *
  122  * MPSAFE
  123  */
  124 static __inline int
  125 jailed(struct ucred *cred)
  126 {
  127         return(cred->cr_prison != NULL);
  128 }
  129 
  130 #endif /* _KERNEL || _KERNEL_STRUCTURES */
  131 #endif /* !_SYS_JAIL_H_ */

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