xref: /freebsd/sys/sys/jail.h (revision 81ad6265)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 1999 Poul-Henning Kamp.
5  * Copyright (c) 2009 James Gritton.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 #ifndef _SYS_JAIL_H_
33 #define _SYS_JAIL_H_
34 
35 #ifdef _KERNEL
36 struct jail_v0 {
37 	u_int32_t	version;
38 	char		*path;
39 	char		*hostname;
40 	u_int32_t	ip_number;
41 };
42 #endif
43 
44 struct jail {
45 	uint32_t	version;
46 	char		*path;
47 	char		*hostname;
48 	char		*jailname;
49 	uint32_t	ip4s;
50 	uint32_t	ip6s;
51 	struct in_addr	*ip4;
52 	struct in6_addr	*ip6;
53 };
54 #define	JAIL_API_VERSION	2
55 
56 /*
57  * For all xprison structs, always keep the pr_version an int and
58  * the first variable so userspace can easily distinguish them.
59  */
60 #ifndef _KERNEL
61 struct xprison_v1 {
62 	int		 pr_version;
63 	int		 pr_id;
64 	char		 pr_path[MAXPATHLEN];
65 	char		 pr_host[MAXHOSTNAMELEN];
66 	u_int32_t	 pr_ip;
67 };
68 #endif
69 
70 struct xprison {
71 	int		 pr_version;
72 	int		 pr_id;
73 	int		 pr_state;
74 	cpusetid_t	 pr_cpusetid;
75 	char		 pr_path[MAXPATHLEN];
76 	char		 pr_host[MAXHOSTNAMELEN];
77 	char		 pr_name[MAXHOSTNAMELEN];
78 	uint32_t	 pr_ip4s;
79 	uint32_t	 pr_ip6s;
80 #if 0
81 	/*
82 	 * sizeof(xprison) will be malloced + size needed for all
83 	 * IPv4 and IPv6 addesses. Offsets are based numbers of addresses.
84 	 */
85 	struct in_addr	 pr_ip4[];
86 	struct in6_addr	 pr_ip6[];
87 #endif
88 };
89 #define	XPRISON_VERSION		3
90 
91 enum prison_state {
92     PRISON_STATE_INVALID = 0,	/* New prison, not ready to be seen */
93     PRISON_STATE_ALIVE,		/* Current prison, visible to all */
94     PRISON_STATE_DYING		/* Removed but holding resources, */
95 };				/* optionally visible. */
96 
97 /*
98  * Flags for jail_set and jail_get.
99  */
100 #define	JAIL_CREATE	0x01	/* Create jail if it doesn't exist */
101 #define	JAIL_UPDATE	0x02	/* Update parameters of existing jail */
102 #define	JAIL_ATTACH	0x04	/* Attach to jail upon creation */
103 #define	JAIL_DYING	0x08	/* Allow getting a dying jail */
104 #define	JAIL_SET_MASK	0x0f
105 #define	JAIL_GET_MASK	0x08
106 
107 #define	JAIL_SYS_DISABLE	0
108 #define	JAIL_SYS_NEW		1
109 #define	JAIL_SYS_INHERIT	2
110 
111 #ifndef _KERNEL
112 
113 struct iovec;
114 
115 __BEGIN_DECLS
116 int jail(struct jail *);
117 int jail_set(struct iovec *, unsigned int, int);
118 int jail_get(struct iovec *, unsigned int, int);
119 int jail_attach(int);
120 int jail_remove(int);
121 __END_DECLS
122 
123 #else /* _KERNEL */
124 
125 #include <sys/queue.h>
126 #include <sys/sysctl.h>
127 #include <sys/lock.h>
128 #include <sys/mutex.h>
129 #include <sys/_task.h>
130 
131 #define JAIL_MAX	999999
132 
133 #ifdef MALLOC_DECLARE
134 MALLOC_DECLARE(M_PRISON);
135 #endif
136 #endif /* _KERNEL */
137 
138 #if defined(_KERNEL) || defined(_WANT_PRISON)
139 
140 #include <sys/osd.h>
141 
142 #define	HOSTUUIDLEN	64
143 #define	DEFAULT_HOSTUUID	"00000000-0000-0000-0000-000000000000"
144 #define	OSRELEASELEN	32
145 
146 struct racct;
147 struct prison_racct;
148 
149 typedef enum {
150 	PR_INET		= 0,
151 	PR_INET6	= 1,
152 	PR_FAMILY_MAX	= 2,
153 } pr_family_t;
154 
155 /*
156  * This structure describes a prison.  It is pointed to by all struct
157  * ucreds's of the inmates.  pr_ref keeps track of them and is used to
158  * delete the structure when the last inmate is dead.
159  *
160  * Lock key:
161  *   (a) allprison_lock
162  *   (A) allproc_lock
163  *   (c) set only during creation before the structure is shared, no mutex
164  *       required to read
165  *   (m) locked by pr_mtx
166  *   (p) locked by pr_mtx, and also at least shared allprison_lock required
167  *       to update
168  *   (q) locked by both pr_mtx and allprison_lock
169  *   (r) atomic via refcount(9), pr_mtx and allprison_lock required to
170  *       decrement to zero
171  *   (n) read access granted with the network epoch
172  */
173 struct prison {
174 	TAILQ_ENTRY(prison) pr_list;			/* (a) all prisons */
175 	int		 pr_id;				/* (c) prison id */
176 	volatile u_int	 pr_ref;			/* (r) refcount */
177 	volatile u_int	 pr_uref;			/* (r) user (alive) refcount */
178 	unsigned	 pr_flags;			/* (p) PR_* flags */
179 	LIST_HEAD(, prison) pr_children;		/* (a) list of child jails */
180 	LIST_HEAD(, proc) pr_proclist;			/* (A) list of jailed processes */
181 	LIST_ENTRY(prison) pr_sibling;			/* (a) next in parent's list */
182 	struct prison	*pr_parent;			/* (c) containing jail */
183 	struct mtx	 pr_mtx;
184 	struct task	 pr_task;			/* (c) destroy task */
185 	struct osd	 pr_osd;			/* (p) additional data */
186 	struct cpuset	*pr_cpuset;			/* (p) cpuset */
187 	struct vnet	*pr_vnet;			/* (c) network stack */
188 	struct vnode	*pr_root;			/* (c) vnode to rdir */
189 	struct prison_ip  *pr_addrs[PR_FAMILY_MAX];	/* (p,n) IPs of jail */
190 	struct prison_racct *pr_prison_racct;		/* (c) racct jail proxy */
191 	void		*pr_sparep[3];
192 	int		 pr_childcount;			/* (a) number of child jails */
193 	int		 pr_childmax;			/* (p) maximum child jails */
194 	unsigned	 pr_allow;			/* (p) PR_ALLOW_* flags */
195 	int		 pr_securelevel;		/* (p) securelevel */
196 	int		 pr_enforce_statfs;		/* (p) statfs permission */
197 	int		 pr_devfs_rsnum;		/* (p) devfs ruleset */
198 	enum prison_state pr_state;			/* (q) state in life cycle */
199 	int		 pr_spare[2];
200 	int		 pr_osreldate;			/* (c) kern.osreldate value */
201 	unsigned long	 pr_hostid;			/* (p) jail hostid */
202 	char		 pr_name[MAXHOSTNAMELEN];	/* (p) admin jail name */
203 	char		 pr_path[MAXPATHLEN];		/* (c) chroot path */
204 	char		 pr_hostname[MAXHOSTNAMELEN];	/* (p) jail hostname */
205 	char		 pr_domainname[MAXHOSTNAMELEN];	/* (p) jail domainname */
206 	char		 pr_hostuuid[HOSTUUIDLEN];	/* (p) jail hostuuid */
207 	char		 pr_osrelease[OSRELEASELEN];	/* (c) kern.osrelease value */
208 };
209 
210 struct prison_racct {
211 	LIST_ENTRY(prison_racct) prr_next;
212 	char		prr_name[MAXHOSTNAMELEN];
213 	u_int		prr_refcount;
214 	struct racct	*prr_racct;
215 };
216 #endif /* _KERNEL || _WANT_PRISON */
217 
218 #ifdef _KERNEL
219 /* Flag bits set via options */
220 #define	PR_PERSIST	0x00000001	/* Can exist without processes */
221 #define	PR_HOST		0x00000002	/* Virtualize hostname et al */
222 #define	PR_IP4_USER	0x00000004	/* Restrict IPv4 addresses */
223 #define	PR_IP6_USER	0x00000008	/* Restrict IPv6 addresses */
224 #define	PR_VNET		0x00000010	/* Virtual network stack */
225 #define	PR_IP4_SADDRSEL	0x00000080	/* Do IPv4 src addr sel. or use the */
226 					/* primary jail address. */
227 #define	PR_IP6_SADDRSEL	0x00000100	/* Do IPv6 src addr sel. or use the */
228 					/* primary jail address. */
229 
230 /* Internal flag bits */
231 #define	PR_REMOVE	0x01000000	/* In process of being removed */
232 #define	PR_IP4		0x02000000	/* IPv4 restricted or disabled */
233 					/* by this jail or an ancestor */
234 #define	PR_IP6		0x04000000	/* IPv6 restricted or disabled */
235 					/* by this jail or an ancestor */
236 #define PR_COMPLETE_PROC 0x08000000	/* prison_complete called from */
237 					/* prison_proc_free, releases uref */
238 
239 /*
240  * Flags for pr_allow
241  * Bits not noted here may be used for dynamic allow.mount.xxxfs.
242  */
243 #define	PR_ALLOW_SET_HOSTNAME		0x00000001
244 #define	PR_ALLOW_SYSVIPC		0x00000002
245 #define	PR_ALLOW_RAW_SOCKETS		0x00000004
246 #define	PR_ALLOW_CHFLAGS		0x00000008
247 #define	PR_ALLOW_MOUNT			0x00000010
248 #define	PR_ALLOW_QUOTAS			0x00000020
249 #define	PR_ALLOW_SOCKET_AF		0x00000040
250 #define	PR_ALLOW_MLOCK			0x00000080
251 #define	PR_ALLOW_READ_MSGBUF		0x00000100
252 #define	PR_ALLOW_UNPRIV_DEBUG		0x00000200
253 #define	PR_ALLOW_SUSER			0x00000400
254 #define	PR_ALLOW_RESERVED_PORTS		0x00008000
255 #define	PR_ALLOW_KMEM_ACCESS		0x00010000	/* reserved, not used yet */
256 #define	PR_ALLOW_NFSD			0x00020000
257 #define	PR_ALLOW_ALL_STATIC		0x000387ff
258 
259 /*
260  * PR_ALLOW_DIFFERENCES determines which flags are able to be
261  * different between the parent and child jail upon creation.
262  */
263 #define	PR_ALLOW_DIFFERENCES		(PR_ALLOW_UNPRIV_DEBUG)
264 
265 /*
266  * OSD methods
267  */
268 #define	PR_METHOD_CREATE	0
269 #define	PR_METHOD_GET		1
270 #define	PR_METHOD_SET		2
271 #define	PR_METHOD_CHECK		3
272 #define	PR_METHOD_ATTACH	4
273 #define	PR_METHOD_REMOVE	5
274 #define	PR_MAXMETHOD		6
275 
276 /*
277  * Lock/unlock a prison.
278  * XXX These exist not so much for general convenience, but to be useable in
279  *     the FOREACH_PRISON_DESCENDANT_LOCKED macro which can't handle them in
280  *     non-function form as currently defined.
281  */
282 static __inline void
283 prison_lock(struct prison *pr)
284 {
285 
286 	mtx_lock(&pr->pr_mtx);
287 }
288 
289 static __inline void
290 prison_unlock(struct prison *pr)
291 {
292 
293 	mtx_unlock(&pr->pr_mtx);
294 }
295 
296 /* Traverse a prison's immediate children. */
297 #define	FOREACH_PRISON_CHILD(ppr, cpr)					\
298 	LIST_FOREACH(cpr, &(ppr)->pr_children, pr_sibling)
299 
300 /*
301  * Preorder traversal of all of a prison's descendants.
302  * This ugly loop allows the macro to be followed by a single block
303  * as expected in a looping primitive.
304  */
305 #define	FOREACH_PRISON_DESCENDANT(ppr, cpr, descend)			\
306 	for ((cpr) = (ppr), (descend) = 1;				\
307 	    ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))	\
308 	      ? LIST_FIRST(&(cpr)->pr_children)				\
309 	      : ((cpr) == (ppr)						\
310 		 ? NULL							\
311 		 : (((descend) = LIST_NEXT(cpr, pr_sibling) != NULL)	\
312 		    ? LIST_NEXT(cpr, pr_sibling)			\
313 		    : (cpr)->pr_parent))));)				\
314 		if (!(descend))						\
315 			;						\
316 		else
317 
318 /*
319  * As above, but lock descendants on the way down and unlock on the way up.
320  */
321 #define	FOREACH_PRISON_DESCENDANT_LOCKED(ppr, cpr, descend)		\
322 	for ((cpr) = (ppr), (descend) = 1;				\
323 	    ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))	\
324 	      ? LIST_FIRST(&(cpr)->pr_children)				\
325 	      : ((cpr) == (ppr)						\
326 		 ? NULL							\
327 		 : ((prison_unlock(cpr),				\
328 		    (descend) = LIST_NEXT(cpr, pr_sibling) != NULL)	\
329 		    ? LIST_NEXT(cpr, pr_sibling)			\
330 		    : (cpr)->pr_parent))));)				\
331 		if ((descend) ? (prison_lock(cpr), 0) : 1)		\
332 			;						\
333 		else
334 
335 /*
336  * As above, but also keep track of the level descended to.
337  */
338 #define	FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(ppr, cpr, descend, level)\
339 	for ((cpr) = (ppr), (descend) = 1, (level) = 0;			\
340 	    ((cpr) = (((descend) && !LIST_EMPTY(&(cpr)->pr_children))	\
341 	      ? (level++, LIST_FIRST(&(cpr)->pr_children))		\
342 	      : ((cpr) == (ppr)						\
343 		 ? NULL							\
344 		 : ((prison_unlock(cpr),				\
345 		    (descend) = LIST_NEXT(cpr, pr_sibling) != NULL)	\
346 		    ? LIST_NEXT(cpr, pr_sibling)			\
347 		    : (level--, (cpr)->pr_parent)))));)			\
348 		if ((descend) ? (prison_lock(cpr), 0) : 1)		\
349 			;						\
350 		else
351 
352 /*
353  * Traverse a prison's descendants, visiting both preorder and postorder.
354  */
355 #define FOREACH_PRISON_DESCENDANT_PRE_POST(ppr, cpr, descend)		\
356 	for ((cpr) = (ppr), (descend) = 1;				\
357 	     ((cpr) = (descend)						\
358 	      ? ((descend) = !LIST_EMPTY(&(cpr)->pr_children))		\
359 		? LIST_FIRST(&(cpr)->pr_children)			\
360 		: (cpr)							\
361 	      : ((descend) = LIST_NEXT(cpr, pr_sibling) != NULL)	\
362 		? LIST_NEXT(cpr, pr_sibling)				\
363 		: cpr->pr_parent) != (ppr);)
364 
365 /*
366  * Attributes of the physical system, and the root of the jail tree.
367  */
368 extern struct	prison prison0;
369 
370 TAILQ_HEAD(prisonlist, prison);
371 extern struct	prisonlist allprison;
372 extern struct	sx allprison_lock;
373 
374 /*
375  * Sysctls to describe jail parameters.
376  */
377 SYSCTL_DECL(_security_jail_param);
378 
379 #define	SYSCTL_JAIL_PARAM(module, param, type, fmt, descr)		\
380     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,	\
381 	(type) | CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_param, fmt, descr)
382 #define	SYSCTL_JAIL_PARAM_STRING(module, param, access, len, descr)	\
383     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,	\
384 	CTLTYPE_STRING | CTLFLAG_MPSAFE | (access), NULL, len,		\
385 	sysctl_jail_param, "A", descr)
386 #define	SYSCTL_JAIL_PARAM_STRUCT(module, param, access, len, fmt, descr)\
387     SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,	\
388 	CTLTYPE_STRUCT | CTLFLAG_MPSAFE | (access), NULL, len,		\
389 	sysctl_jail_param, fmt, descr)
390 #define	SYSCTL_JAIL_PARAM_NODE(module, descr)				\
391     SYSCTL_NODE(_security_jail_param, OID_AUTO, module, CTLFLAG_MPSAFE,	\
392         0, descr)
393 #define	SYSCTL_JAIL_PARAM_SUBNODE(parent, module, descr)		\
394     SYSCTL_NODE(_security_jail_param_##parent, OID_AUTO, module, 	\
395         CTLFLAG_MPSAFE, 0, descr)
396 #define	SYSCTL_JAIL_PARAM_SYS_NODE(module, access, descr)		\
397     SYSCTL_JAIL_PARAM_NODE(module, descr);				\
398     SYSCTL_JAIL_PARAM(_##module, , CTLTYPE_INT | (access), "E,jailsys",	\
399 	descr)
400 
401 /*
402  * Kernel support functions for jail().
403  */
404 struct ucred;
405 struct mount;
406 struct sockaddr;
407 struct statfs;
408 struct vfsconf;
409 
410 /*
411  * Return 1 if the passed credential is in a jail, otherwise 0.
412  */
413 #define jailed(cred)	(cred->cr_prison != &prison0)
414 
415 int jailed_without_vnet(struct ucred *);
416 void getcredhostname(struct ucred *, char *, size_t);
417 void getcreddomainname(struct ucred *, char *, size_t);
418 void getcredhostuuid(struct ucred *, char *, size_t);
419 void getcredhostid(struct ucred *, unsigned long *);
420 void getjailname(struct ucred *cred, char *name, size_t len);
421 void prison0_init(void);
422 int prison_allow(struct ucred *, unsigned);
423 int prison_check(struct ucred *cred1, struct ucred *cred2);
424 bool prison_check_nfsd(struct ucred *cred);
425 int prison_owns_vnet(struct ucred *);
426 int prison_canseemount(struct ucred *cred, struct mount *mp);
427 void prison_enforce_statfs(struct ucred *cred, struct mount *mp,
428     struct statfs *sp);
429 struct prison *prison_find(int prid);
430 struct prison *prison_find_child(struct prison *, int);
431 struct prison *prison_find_name(struct prison *, const char *);
432 int prison_flag(struct ucred *, unsigned);
433 void prison_free(struct prison *pr);
434 void prison_free_locked(struct prison *pr);
435 void prison_hold(struct prison *pr);
436 void prison_hold_locked(struct prison *pr);
437 void prison_proc_hold(struct prison *);
438 void prison_proc_free(struct prison *);
439 void prison_proc_link(struct prison *, struct proc *);
440 void prison_proc_unlink(struct prison *, struct proc *);
441 void prison_proc_iterate(struct prison *, void (*)(struct proc *, void *), void *);
442 void prison_set_allow(struct ucred *cred, unsigned flag, int enable);
443 int prison_ischild(struct prison *, struct prison *);
444 bool prison_isalive(const struct prison *);
445 bool prison_isvalid(struct prison *);
446 #if defined(INET) || defined(INET6)
447 int prison_ip_check(const struct prison *, const pr_family_t, const void *);
448 const void *prison_ip_get0(const struct prison *, const pr_family_t);
449 u_int prison_ip_cnt(const struct prison *, const pr_family_t);
450 #endif
451 #ifdef INET
452 int prison_equal_ip4(struct prison *, struct prison *);
453 int prison_get_ip4(struct ucred *cred, struct in_addr *ia);
454 int prison_local_ip4(struct ucred *cred, struct in_addr *ia);
455 int prison_remote_ip4(struct ucred *cred, struct in_addr *ia);
456 int prison_check_ip4(const struct ucred *, const struct in_addr *);
457 int prison_check_ip4_locked(const struct prison *, const struct in_addr *);
458 int prison_saddrsel_ip4(struct ucred *, struct in_addr *);
459 int prison_qcmp_v4(const void *, const void *);
460 bool prison_valid_v4(const void *);
461 #endif
462 #ifdef INET6
463 int prison_equal_ip6(struct prison *, struct prison *);
464 int prison_get_ip6(struct ucred *, struct in6_addr *);
465 int prison_local_ip6(struct ucred *, struct in6_addr *, int);
466 int prison_remote_ip6(struct ucred *, struct in6_addr *);
467 int prison_check_ip6(const struct ucred *, const struct in6_addr *);
468 int prison_check_ip6_locked(const struct prison *, const struct in6_addr *);
469 int prison_saddrsel_ip6(struct ucred *, struct in6_addr *);
470 int prison_qcmp_v6(const void *, const void *);
471 bool prison_valid_v6(const void *);
472 #endif
473 int prison_check_af(struct ucred *cred, int af);
474 int prison_if(struct ucred *cred, const struct sockaddr *sa);
475 char *prison_name(struct prison *, struct prison *);
476 int prison_priv_check(struct ucred *cred, int priv);
477 int sysctl_jail_param(SYSCTL_HANDLER_ARGS);
478 unsigned prison_add_allow(const char *prefix, const char *name,
479     const char *prefix_descr, const char *descr);
480 void prison_add_vfs(struct vfsconf *vfsp);
481 void prison_racct_foreach(void (*callback)(struct racct *racct,
482     void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
483     void *arg2, void *arg3);
484 struct prison_racct *prison_racct_find(const char *name);
485 void prison_racct_hold(struct prison_racct *prr);
486 void prison_racct_free(struct prison_racct *prr);
487 
488 #endif /* _KERNEL */
489 #endif /* !_SYS_JAIL_H_ */
490