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_PREPARE,	/* Commands run outside jail before addrs and mounting */
91	IP_EXEC_PRESTART,	/* Commands run outside jail before creating */
92	IP_EXEC_PRESTOP,	/* Commands run outside jail before removing */
93	IP_EXEC_RELEASE,	/* Commands run outside jail after addrs and unmounted */
94	IP_EXEC_CREATED,	/* Commands run outside jail right after it was started */
95	IP_EXEC_START,		/* Commands run inside jail on creation */
96	IP_EXEC_STOP,		/* Commands run inside jail on removal */
97	IP_EXEC_SYSTEM_JAIL_USER,/* Get jail_user from system passwd file */
98	IP_EXEC_SYSTEM_USER,	/* Run non-jailed commands as this user */
99	IP_EXEC_TIMEOUT,	/* Time to wait for a command to complete */
100#if defined(INET) || defined(INET6)
101	IP_INTERFACE,		/* Add IP addresses to this interface */
102	IP_IP_HOSTNAME,		/* Get jail IP address(es) from hostname */
103#endif
104	IP_MOUNT,		/* Mount points in fstab(5) form */
105	IP_MOUNT_DEVFS,		/* Mount /dev under prison root */
106	IP_MOUNT_FDESCFS,	/* Mount /dev/fd under prison root */
107	IP_MOUNT_PROCFS,	/* Mount /proc under prison root */
108	IP_MOUNT_FSTAB,		/* A standard fstab(5) file */
109	IP_STOP_TIMEOUT,	/* Time to wait after sending SIGTERM */
110	IP_VNET_INTERFACE,	/* Assign interface(s) to vnet jail */
111#ifdef INET
112	IP__IP4_IFADDR,		/* Copy of ip4.addr with interface/netmask */
113#endif
114#ifdef INET6
115	IP__IP6_IFADDR,		/* Copy of ip6.addr with interface/prefixlen */
116#endif
117	IP__MOUNT_FROM_FSTAB,	/* Line from mount.fstab file */
118	IP__OP,			/* Placeholder for requested operation */
119	KP_ALLOW_CHFLAGS,
120	KP_ALLOW_MOUNT,
121	KP_ALLOW_RAW_SOCKETS,
122	KP_ALLOW_SET_HOSTNAME,
123	KP_ALLOW_SOCKET_AF,
124	KP_ALLOW_SYSVIPC,
125	KP_DEVFS_RULESET,
126	KP_HOST_HOSTNAME,
127#ifdef INET
128	KP_IP4_ADDR,
129#endif
130#ifdef INET6
131	KP_IP6_ADDR,
132#endif
133	KP_JID,
134	KP_NAME,
135	KP_PATH,
136	KP_PERSIST,
137	KP_SECURELEVEL,
138	KP_VNET,
139	IP_NPARAM
140};
141
142STAILQ_HEAD(cfvars, cfvar);
143
144struct cfvar {
145	STAILQ_ENTRY(cfvar)	tq;
146	char			*name;
147	size_t			pos;
148};
149
150TAILQ_HEAD(cfstrings, cfstring);
151
152struct cfstring {
153	TAILQ_ENTRY(cfstring)	tq;
154	char			*s;
155	size_t			len;
156	struct cfvars		vars;
157};
158
159TAILQ_HEAD(cfparams, cfparam);
160
161struct cfparam {
162	TAILQ_ENTRY(cfparam)	tq;
163	char			*name;
164	struct cfstrings	val;
165	unsigned		flags;
166	int			gen;
167};
168
169TAILQ_HEAD(cfjails, cfjail);
170STAILQ_HEAD(cfdepends, cfdepend);
171
172struct cfjail {
173	TAILQ_ENTRY(cfjail)	tq;
174	char			*name;
175	char			*comline;
176	struct cfparams		params;
177	struct cfdepends	dep[2];
178	struct cfjails		*queue;
179	struct cfparam		*intparams[IP_NPARAM];
180	struct cfstring		*comstring;
181	struct jailparam	*jp;
182	struct timespec		timeout;
183	const enum intparam	*comparam;
184	unsigned		flags;
185	int			jid;
186	int			seq;
187	int			pstatus;
188	int			ndeps;
189	int			njp;
190	int			nprocs;
191};
192
193struct cfdepend {
194	STAILQ_ENTRY(cfdepend)	tq[2];
195	struct cfjail		*j[2];
196	unsigned		flags;
197};
198
199extern void *emalloc(size_t);
200extern void *erealloc(void *, size_t);
201extern char *estrdup(const char *);
202extern int create_jail(struct cfjail *j);
203extern void failed(struct cfjail *j);
204extern void jail_note(const struct cfjail *j, const char *fmt, ...);
205extern void jail_warnx(const struct cfjail *j, const char *fmt, ...);
206
207extern int next_command(struct cfjail *j);
208extern int finish_command(struct cfjail *j);
209extern struct cfjail *next_proc(int nonblock);
210
211extern void load_config(void);
212extern struct cfjail *add_jail(void);
213extern void add_param(struct cfjail *j, const struct cfparam *p,
214    enum intparam ipnum, const char *value);
215extern int bool_param(const struct cfparam *p);
216extern int int_param(const struct cfparam *p, int *ip);
217extern const char *string_param(const struct cfparam *p);
218extern int check_intparams(struct cfjail *j);
219extern int import_params(struct cfjail *j);
220extern int equalopts(const char *opt1, const char *opt2);
221extern int wild_jail_name(const char *wname);
222extern int wild_jail_match(const char *jname, const char *wname);
223
224extern void dep_setup(int docf);
225extern int dep_check(struct cfjail *j);
226extern void dep_done(struct cfjail *j, unsigned flags);
227extern void dep_reset(struct cfjail *j);
228extern struct cfjail *next_jail(void);
229extern int start_state(const char *target, int docf, unsigned state,
230    int running);
231extern void requeue(struct cfjail *j, struct cfjails *queue);
232extern void requeue_head(struct cfjail *j, struct cfjails *queue);
233
234extern void yyerror(const char *);
235extern int yylex(void);
236
237extern struct cfjails cfjails;
238extern struct cfjails ready;
239extern struct cfjails depend;
240extern const char *cfname;
241extern int iflag;
242extern int note_remove;
243extern int paralimit;
244extern int verbose;
245