1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 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 * $FreeBSD$
29 */
30
31#include <sys/param.h>
32#include <sys/types.h>
33#include <sys/jail.h>
34#include <sys/queue.h>
35#include <sys/time.h>
36
37#include <jail.h>
38
39#define CONF_FILE	"/etc/jail.conf"
40
41#define DEP_FROM	0
42#define DEP_TO		1
43
44#define DF_SEEN		0x01	/* Dependency has been followed */
45#define DF_LIGHT	0x02	/* Implied dependency on jail existence only */
46#define DF_NOFAIL	0x04	/* Don't propagate failed jails */
47
48#define PF_VAR		0x01	/* This is a variable, not a true parameter */
49#define PF_APPEND	0x02	/* Append to existing parameter list */
50#define PF_BAD		0x04	/* Unable to resolve parameter value */
51#define PF_INTERNAL	0x08	/* Internal parameter, not passed to kernel */
52#define PF_BOOL		0x10	/* Boolean parameter */
53#define PF_INT		0x20	/* Integer parameter */
54#define PF_CONV		0x40	/* Parameter duplicated in converted form */
55#define PF_REV		0x80	/* Run commands in reverse order on stopping */
56#define	PF_IMMUTABLE	0x100	/* Immutable parameter */
57
58#define JF_START	0x0001	/* -c */
59#define JF_SET		0x0002	/* -m */
60#define JF_STOP		0x0004	/* -r */
61#define JF_DEPEND	0x0008	/* Operation required by dependency */
62#define JF_WILD		0x0010	/* Not specified on the command line */
63#define JF_FAILED	0x0020	/* Operation failed */
64#define JF_PARAMS	0x0040	/* Parameters checked and imported */
65#define JF_RDTUN	0x0080	/* Create-only parameter check has been done */
66#define JF_PERSIST	0x0100	/* Jail is temporarily persistent */
67#define JF_TIMEOUT	0x0200	/* A command (or process kill) timed out */
68#define JF_SLEEPQ	0x0400	/* Waiting on a command and/or timeout */
69#define JF_FROM_RUNQ	0x0800	/* Has already been on the run queue */
70#define JF_SHOW		0x1000	/* -e Exhibit list of configured jails */
71
72#define JF_OP_MASK		(JF_START | JF_SET | JF_STOP)
73#define JF_RESTART		(JF_START | JF_STOP)
74#define JF_START_SET		(JF_START | JF_SET)
75#define JF_SET_RESTART		(JF_SET | JF_STOP)
76#define JF_START_SET_RESTART	(JF_START | JF_SET | JF_STOP)
77#define JF_DO_STOP(js)		(((js) & (JF_SET | JF_STOP)) == JF_STOP)
78
79enum intparam {
80	IP__NULL = 0,		/* Null command */
81	IP_ALLOW_DYING,		/* Allow making changes to a dying jail */
82	IP_COMMAND,		/* Command run inside jail at creation */
83	IP_DEPEND,		/* Jail starts after (stops before) another */
84	IP_EXEC_CLEAN,		/* Run commands in a clean environment */
85	IP_EXEC_CONSOLELOG,	/* Redirect optput for commands run in jail */
86	IP_EXEC_FIB,		/* Run jailed commands with this FIB */
87	IP_EXEC_JAIL_USER,	/* Run jailed commands as this user */
88	IP_EXEC_POSTSTART,	/* Commands run outside jail after creating */
89	IP_EXEC_POSTSTOP,	/* Commands run outside jail after removing */
90	IP_EXEC_PRESTART,	/* Commands run outside jail before creating */
91	IP_EXEC_PRESTOP,	/* Commands run outside jail before removing */
92	IP_EXEC_CREATED,	/* Commands run outside jail right after it was started */
93	IP_EXEC_START,		/* Commands run inside jail on creation */
94	IP_EXEC_STOP,		/* Commands run inside jail on removal */
95	IP_EXEC_SYSTEM_JAIL_USER,/* Get jail_user from system passwd file */
96	IP_EXEC_SYSTEM_USER,	/* Run non-jailed commands as this user */
97	IP_EXEC_TIMEOUT,	/* Time to wait for a command to complete */
98#if defined(INET) || defined(INET6)
99	IP_INTERFACE,		/* Add IP addresses to this interface */
100	IP_IP_HOSTNAME,		/* Get jail IP address(es) from hostname */
101#endif
102	IP_MOUNT,		/* Mount points in fstab(5) form */
103	IP_MOUNT_DEVFS,		/* Mount /dev under prison root */
104	IP_MOUNT_FDESCFS,	/* Mount /dev/fd under prison root */
105	IP_MOUNT_PROCFS,	/* Mount /proc under prison root */
106	IP_MOUNT_FSTAB,		/* A standard fstab(5) file */
107	IP_STOP_TIMEOUT,	/* Time to wait after sending SIGTERM */
108	IP_VNET_INTERFACE,	/* Assign interface(s) to vnet jail */
109#ifdef INET
110	IP__IP4_IFADDR,		/* Copy of ip4.addr with interface/netmask */
111#endif
112#ifdef INET6
113	IP__IP6_IFADDR,		/* Copy of ip6.addr with interface/prefixlen */
114#endif
115	IP__MOUNT_FROM_FSTAB,	/* Line from mount.fstab file */
116	IP__OP,			/* Placeholder for requested operation */
117	KP_ALLOW_CHFLAGS,
118	KP_ALLOW_MOUNT,
119	KP_ALLOW_RAW_SOCKETS,
120	KP_ALLOW_SET_HOSTNAME,
121	KP_ALLOW_SOCKET_AF,
122	KP_ALLOW_SYSVIPC,
123	KP_DEVFS_RULESET,
124	KP_HOST_HOSTNAME,
125#ifdef INET
126	KP_IP4_ADDR,
127#endif
128#ifdef INET6
129	KP_IP6_ADDR,
130#endif
131	KP_JID,
132	KP_NAME,
133	KP_PATH,
134	KP_PERSIST,
135	KP_SECURELEVEL,
136	KP_VNET,
137	IP_NPARAM
138};
139
140STAILQ_HEAD(cfvars, cfvar);
141
142struct cfvar {
143	STAILQ_ENTRY(cfvar)	tq;
144	char			*name;
145	size_t			pos;
146};
147
148TAILQ_HEAD(cfstrings, cfstring);
149
150struct cfstring {
151	TAILQ_ENTRY(cfstring)	tq;
152	char			*s;
153	size_t			len;
154	struct cfvars		vars;
155};
156
157TAILQ_HEAD(cfparams, cfparam);
158
159struct cfparam {
160	TAILQ_ENTRY(cfparam)	tq;
161	char			*name;
162	struct cfstrings	val;
163	unsigned		flags;
164	int			gen;
165};
166
167TAILQ_HEAD(cfjails, cfjail);
168STAILQ_HEAD(cfdepends, cfdepend);
169
170struct cfjail {
171	TAILQ_ENTRY(cfjail)	tq;
172	char			*name;
173	char			*comline;
174	struct cfparams		params;
175	struct cfdepends	dep[2];
176	struct cfjails		*queue;
177	struct cfparam		*intparams[IP_NPARAM];
178	struct cfstring		*comstring;
179	struct jailparam	*jp;
180	struct timespec		timeout;
181	const enum intparam	*comparam;
182	unsigned		flags;
183	int			jid;
184	int			seq;
185	int			pstatus;
186	int			ndeps;
187	int			njp;
188	int			nprocs;
189};
190
191struct cfdepend {
192	STAILQ_ENTRY(cfdepend)	tq[2];
193	struct cfjail		*j[2];
194	unsigned		flags;
195};
196
197extern void *emalloc(size_t);
198extern void *erealloc(void *, size_t);
199extern char *estrdup(const char *);
200extern int create_jail(struct cfjail *j);
201extern void failed(struct cfjail *j);
202extern void jail_note(const struct cfjail *j, const char *fmt, ...);
203extern void jail_warnx(const struct cfjail *j, const char *fmt, ...);
204
205extern int next_command(struct cfjail *j);
206extern int finish_command(struct cfjail *j);
207extern struct cfjail *next_proc(int nonblock);
208
209extern void load_config(void);
210extern struct cfjail *add_jail(void);
211extern void add_param(struct cfjail *j, const struct cfparam *p,
212    enum intparam ipnum, const char *value);
213extern int bool_param(const struct cfparam *p);
214extern int int_param(const struct cfparam *p, int *ip);
215extern const char *string_param(const struct cfparam *p);
216extern int check_intparams(struct cfjail *j);
217extern int import_params(struct cfjail *j);
218extern int equalopts(const char *opt1, const char *opt2);
219extern int wild_jail_name(const char *wname);
220extern int wild_jail_match(const char *jname, const char *wname);
221
222extern void dep_setup(int docf);
223extern int dep_check(struct cfjail *j);
224extern void dep_done(struct cfjail *j, unsigned flags);
225extern void dep_reset(struct cfjail *j);
226extern struct cfjail *next_jail(void);
227extern int start_state(const char *target, int docf, unsigned state,
228    int running);
229extern void requeue(struct cfjail *j, struct cfjails *queue);
230extern void requeue_head(struct cfjail *j, struct cfjails *queue);
231
232extern void yyerror(const char *);
233extern int yylex(void);
234
235extern struct cfjails cfjails;
236extern struct cfjails ready;
237extern struct cfjails depend;
238extern const char *cfname;
239extern int iflag;
240extern int note_remove;
241extern int paralimit;
242extern int verbose;
243