415 lines
14 KiB
C
415 lines
14 KiB
C
/*-
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* Copyright (c) 1999 Poul-Henning Kamp.
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* Copyright (c) 2009 James Gritton.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_JAIL_H_
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#define _SYS_JAIL_H_
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#ifdef _KERNEL
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struct jail_v0 {
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u_int32_t version;
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char *path;
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char *hostname;
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u_int32_t ip_number;
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};
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#endif
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struct jail {
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uint32_t version;
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char *path;
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char *hostname;
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char *jailname;
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uint32_t ip4s;
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uint32_t ip6s;
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struct in_addr *ip4;
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struct in6_addr *ip6;
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};
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#define JAIL_API_VERSION 2
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/*
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* For all xprison structs, always keep the pr_version an int and
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* the first variable so userspace can easily distinguish them.
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*/
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#ifndef _KERNEL
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struct xprison_v1 {
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int pr_version;
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int pr_id;
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char pr_path[MAXPATHLEN];
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char pr_host[MAXHOSTNAMELEN];
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u_int32_t pr_ip;
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};
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#endif
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struct xprison {
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int pr_version;
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int pr_id;
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int pr_state;
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cpusetid_t pr_cpusetid;
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char pr_path[MAXPATHLEN];
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char pr_host[MAXHOSTNAMELEN];
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char pr_name[MAXHOSTNAMELEN];
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uint32_t pr_ip4s;
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uint32_t pr_ip6s;
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#if 0
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/*
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* sizeof(xprison) will be malloced + size needed for all
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* IPv4 and IPv6 addesses. Offsets are based numbers of addresses.
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*/
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struct in_addr pr_ip4[];
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struct in6_addr pr_ip6[];
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#endif
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};
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#define XPRISON_VERSION 3
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#define PRISON_STATE_INVALID 0
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#define PRISON_STATE_ALIVE 1
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#define PRISON_STATE_DYING 2
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/*
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* Flags for jail_set and jail_get.
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*/
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#define JAIL_CREATE 0x01 /* Create jail if it doesn't exist */
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#define JAIL_UPDATE 0x02 /* Update parameters of existing jail */
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#define JAIL_ATTACH 0x04 /* Attach to jail upon creation */
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#define JAIL_DYING 0x08 /* Allow getting a dying jail */
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#define JAIL_SET_MASK 0x0f
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#define JAIL_GET_MASK 0x08
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#define JAIL_SYS_DISABLE 0
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#define JAIL_SYS_NEW 1
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#define JAIL_SYS_INHERIT 2
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#ifndef _KERNEL
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struct iovec;
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int jail(struct jail *);
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int jail_set(struct iovec *, unsigned int, int);
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int jail_get(struct iovec *, unsigned int, int);
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int jail_attach(int);
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int jail_remove(int);
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#else /* _KERNEL */
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/_task.h>
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#define JAIL_MAX 999999
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_PRISON);
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#endif
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#endif /* _KERNEL */
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#if defined(_KERNEL) || defined(_WANT_PRISON)
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#include <sys/osd.h>
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#define HOSTUUIDLEN 64
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#define OSRELEASELEN 32
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struct racct;
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struct prison_racct;
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/*
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* This structure describes a prison. It is pointed to by all struct
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* ucreds's of the inmates. pr_ref keeps track of them and is used to
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* delete the struture when the last inmate is dead.
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*
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* Lock key:
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* (a) allprison_lock
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* (p) locked by pr_mtx
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* (c) set only during creation before the structure is shared, no mutex
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* required to read
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*/
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struct prison {
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TAILQ_ENTRY(prison) pr_list; /* (a) all prisons */
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int pr_id; /* (c) prison id */
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int pr_ref; /* (p) refcount */
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int pr_uref; /* (p) user (alive) refcount */
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unsigned pr_flags; /* (p) PR_* flags */
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LIST_HEAD(, prison) pr_children; /* (a) list of child jails */
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LIST_ENTRY(prison) pr_sibling; /* (a) next in parent's list */
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struct prison *pr_parent; /* (c) containing jail */
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struct mtx pr_mtx;
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struct task pr_task; /* (c) destroy task */
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struct osd pr_osd; /* (p) additional data */
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struct cpuset *pr_cpuset; /* (p) cpuset */
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struct vnet *pr_vnet; /* (c) network stack */
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struct vnode *pr_root; /* (c) vnode to rdir */
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int pr_ip4s; /* (p) number of v4 IPs */
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int pr_ip6s; /* (p) number of v6 IPs */
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struct in_addr *pr_ip4; /* (p) v4 IPs of jail */
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struct in6_addr *pr_ip6; /* (p) v6 IPs of jail */
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struct prison_racct *pr_prison_racct; /* (c) racct jail proxy */
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void *pr_sparep[3];
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int pr_childcount; /* (a) number of child jails */
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int pr_childmax; /* (p) maximum child jails */
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unsigned pr_allow; /* (p) PR_ALLOW_* flags */
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int pr_securelevel; /* (p) securelevel */
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int pr_enforce_statfs; /* (p) statfs permission */
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int pr_devfs_rsnum; /* (p) devfs ruleset */
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int pr_spare[3];
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int pr_osreldate; /* (c) kern.osreldate value */
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unsigned long pr_hostid; /* (p) jail hostid */
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char pr_name[MAXHOSTNAMELEN]; /* (p) admin jail name */
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char pr_path[MAXPATHLEN]; /* (c) chroot path */
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char pr_hostname[MAXHOSTNAMELEN]; /* (p) jail hostname */
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char pr_domainname[MAXHOSTNAMELEN]; /* (p) jail domainname */
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char pr_hostuuid[HOSTUUIDLEN]; /* (p) jail hostuuid */
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char pr_osrelease[OSRELEASELEN]; /* (c) kern.osrelease value */
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};
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struct prison_racct {
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LIST_ENTRY(prison_racct) prr_next;
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char prr_name[MAXHOSTNAMELEN];
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u_int prr_refcount;
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struct racct *prr_racct;
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};
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#endif /* _KERNEL || _WANT_PRISON */
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#ifdef _KERNEL
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/* Flag bits set via options */
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#define PR_PERSIST 0x00000001 /* Can exist without processes */
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#define PR_HOST 0x00000002 /* Virtualize hostname et al */
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#define PR_IP4_USER 0x00000004 /* Restrict IPv4 addresses */
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#define PR_IP6_USER 0x00000008 /* Restrict IPv6 addresses */
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#define PR_VNET 0x00000010 /* Virtual network stack */
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#define PR_IP4_SADDRSEL 0x00000080 /* Do IPv4 src addr sel. or use the */
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/* primary jail address. */
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#define PR_IP6_SADDRSEL 0x00000100 /* Do IPv6 src addr sel. or use the */
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/* primary jail address. */
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/* Internal flag bits */
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#define PR_IP4 0x02000000 /* IPv4 restricted or disabled */
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/* by this jail or an ancestor */
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#define PR_IP6 0x04000000 /* IPv6 restricted or disabled */
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/* by this jail or an ancestor */
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/* Flags for pr_allow */
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#define PR_ALLOW_SET_HOSTNAME 0x0001
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#define PR_ALLOW_SYSVIPC 0x0002
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#define PR_ALLOW_RAW_SOCKETS 0x0004
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#define PR_ALLOW_CHFLAGS 0x0008
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#define PR_ALLOW_MOUNT 0x0010
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#define PR_ALLOW_QUOTAS 0x0020
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#define PR_ALLOW_SOCKET_AF 0x0040
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#define PR_ALLOW_MOUNT_DEVFS 0x0080
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#define PR_ALLOW_MOUNT_NULLFS 0x0100
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#define PR_ALLOW_MOUNT_ZFS 0x0200
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#define PR_ALLOW_MOUNT_PROCFS 0x0400
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#define PR_ALLOW_MOUNT_TMPFS 0x0800
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#define PR_ALLOW_MOUNT_FDESCFS 0x1000
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#define PR_ALLOW_MOUNT_LINPROCFS 0x2000
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#define PR_ALLOW_MOUNT_LINSYSFS 0x4000
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#define PR_ALLOW_ALL 0x7fff
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/*
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* OSD methods
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*/
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#define PR_METHOD_CREATE 0
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#define PR_METHOD_GET 1
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#define PR_METHOD_SET 2
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#define PR_METHOD_CHECK 3
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#define PR_METHOD_ATTACH 4
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#define PR_METHOD_REMOVE 5
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#define PR_MAXMETHOD 6
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/*
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* Lock/unlock a prison.
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* XXX These exist not so much for general convenience, but to be useable in
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* the FOREACH_PRISON_DESCENDANT_LOCKED macro which can't handle them in
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* non-function form as currently defined.
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*/
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static __inline void
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prison_lock(struct prison *pr)
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{
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mtx_lock(&pr->pr_mtx);
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}
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static __inline void
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prison_unlock(struct prison *pr)
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{
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mtx_unlock(&pr->pr_mtx);
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}
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/* Traverse a prison's immediate children. */
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#define FOREACH_PRISON_CHILD(ppr, cpr) \
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LIST_FOREACH(cpr, &(ppr)->pr_children, pr_sibling)
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/*
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* Preorder traversal of all of a prison's descendants.
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* This ugly loop allows the macro to be followed by a single block
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* as expected in a looping primitive.
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*/
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#define FOREACH_PRISON_DESCENDANT(ppr, cpr, descend) \
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for ((cpr) = (ppr), (descend) = 1; \
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((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children)) \
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? LIST_FIRST(&(cpr)->pr_children) \
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: ((cpr) == (ppr) \
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? NULL \
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: (((descend) = LIST_NEXT(cpr, pr_sibling) != NULL) \
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? LIST_NEXT(cpr, pr_sibling) \
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: (cpr)->pr_parent))));) \
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if (!(descend)) \
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; \
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else
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/*
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* As above, but lock descendants on the way down and unlock on the way up.
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*/
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#define FOREACH_PRISON_DESCENDANT_LOCKED(ppr, cpr, descend) \
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for ((cpr) = (ppr), (descend) = 1; \
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((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children)) \
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? LIST_FIRST(&(cpr)->pr_children) \
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: ((cpr) == (ppr) \
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? NULL \
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: ((prison_unlock(cpr), \
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(descend) = LIST_NEXT(cpr, pr_sibling) != NULL) \
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? LIST_NEXT(cpr, pr_sibling) \
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: (cpr)->pr_parent))));) \
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if ((descend) ? (prison_lock(cpr), 0) : 1) \
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; \
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else
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/*
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* As above, but also keep track of the level descended to.
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*/
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#define FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(ppr, cpr, descend, level)\
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for ((cpr) = (ppr), (descend) = 1, (level) = 0; \
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((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children)) \
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? (level++, LIST_FIRST(&(cpr)->pr_children)) \
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: ((cpr) == (ppr) \
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? NULL \
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: ((prison_unlock(cpr), \
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(descend) = LIST_NEXT(cpr, pr_sibling) != NULL) \
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? LIST_NEXT(cpr, pr_sibling) \
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: (level--, (cpr)->pr_parent)))));) \
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if ((descend) ? (prison_lock(cpr), 0) : 1) \
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; \
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else
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/*
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* Attributes of the physical system, and the root of the jail tree.
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*/
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extern struct prison prison0;
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TAILQ_HEAD(prisonlist, prison);
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extern struct prisonlist allprison;
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extern struct sx allprison_lock;
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/*
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* Sysctls to describe jail parameters.
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*/
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SYSCTL_DECL(_security_jail_param);
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#define SYSCTL_JAIL_PARAM(module, param, type, fmt, descr) \
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SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param, \
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(type) | CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_param, fmt, descr)
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#define SYSCTL_JAIL_PARAM_STRING(module, param, access, len, descr) \
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SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param, \
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CTLTYPE_STRING | CTLFLAG_MPSAFE | (access), NULL, len, \
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sysctl_jail_param, "A", descr)
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#define SYSCTL_JAIL_PARAM_STRUCT(module, param, access, len, fmt, descr)\
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SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param, \
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CTLTYPE_STRUCT | CTLFLAG_MPSAFE | (access), NULL, len, \
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sysctl_jail_param, fmt, descr)
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#define SYSCTL_JAIL_PARAM_NODE(module, descr) \
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SYSCTL_NODE(_security_jail_param, OID_AUTO, module, 0, 0, descr)
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#define SYSCTL_JAIL_PARAM_SUBNODE(parent, module, descr) \
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SYSCTL_NODE(_security_jail_param_##parent, OID_AUTO, module, 0, 0, descr)
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#define SYSCTL_JAIL_PARAM_SYS_NODE(module, access, descr) \
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SYSCTL_JAIL_PARAM_NODE(module, descr); \
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SYSCTL_JAIL_PARAM(_##module, , CTLTYPE_INT | (access), "E,jailsys", \
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descr)
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/*
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* Kernel support functions for jail().
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*/
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struct ucred;
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struct mount;
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struct sockaddr;
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struct statfs;
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int jailed(struct ucred *cred);
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int jailed_without_vnet(struct ucred *);
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void getcredhostname(struct ucred *, char *, size_t);
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void getcreddomainname(struct ucred *, char *, size_t);
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void getcredhostuuid(struct ucred *, char *, size_t);
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void getcredhostid(struct ucred *, unsigned long *);
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void prison0_init(void);
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int prison_allow(struct ucred *, unsigned);
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int prison_check(struct ucred *cred1, struct ucred *cred2);
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int prison_owns_vnet(struct ucred *);
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int prison_canseemount(struct ucred *cred, struct mount *mp);
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void prison_enforce_statfs(struct ucred *cred, struct mount *mp,
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struct statfs *sp);
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struct prison *prison_find(int prid);
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struct prison *prison_find_child(struct prison *, int);
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struct prison *prison_find_name(struct prison *, const char *);
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int prison_flag(struct ucred *, unsigned);
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void prison_free(struct prison *pr);
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void prison_free_locked(struct prison *pr);
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void prison_hold(struct prison *pr);
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void prison_hold_locked(struct prison *pr);
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void prison_proc_hold(struct prison *);
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void prison_proc_free(struct prison *);
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int prison_ischild(struct prison *, struct prison *);
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int prison_equal_ip4(struct prison *, struct prison *);
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int prison_get_ip4(struct ucred *cred, struct in_addr *ia);
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int prison_local_ip4(struct ucred *cred, struct in_addr *ia);
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int prison_remote_ip4(struct ucred *cred, struct in_addr *ia);
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int prison_check_ip4(const struct ucred *, const struct in_addr *);
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int prison_saddrsel_ip4(struct ucred *, struct in_addr *);
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#ifdef INET6
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int prison_equal_ip6(struct prison *, struct prison *);
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int prison_get_ip6(struct ucred *, struct in6_addr *);
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int prison_local_ip6(struct ucred *, struct in6_addr *, int);
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int prison_remote_ip6(struct ucred *, struct in6_addr *);
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int prison_check_ip6(struct ucred *, struct in6_addr *);
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int prison_saddrsel_ip6(struct ucred *, struct in6_addr *);
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#endif
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int prison_check_af(struct ucred *cred, int af);
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int prison_if(struct ucred *cred, struct sockaddr *sa);
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char *prison_name(struct prison *, struct prison *);
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int prison_priv_check(struct ucred *cred, int priv);
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int sysctl_jail_param(SYSCTL_HANDLER_ARGS);
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void prison_racct_foreach(void (*callback)(struct racct *racct,
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void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
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void *arg2, void *arg3);
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struct prison_racct *prison_racct_find(const char *name);
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void prison_racct_hold(struct prison_racct *prr);
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void prison_racct_free(struct prison_racct *prr);
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#endif /* _KERNEL */
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#endif /* !_SYS_JAIL_H_ */
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