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freebsd-dev/usr.sbin/jail/jailp.h
Hiroki Sato 64bb8a3881 Implement PF_IMMUTABLE flag and apply it to "name" and "jid" in 
jail.conf parameters.  This flag disallows redefinition of the parameter.

"name" and/or "jid" are automatically defined in jail.conf by using
the jail names at the front of jail parameter definitions.  However,
one could override them by using a variable with the same name like
$name = "foo".  This confused the parser and could end up with SIGSEGV.

Note that this change also affects a case when all of parameters are
defined in the command line arguments, not in jail.conf.  Specifically,
"jail -c name=j1 name=j2" no longer works.  This should be harmless.

PR:		196574
Reviewed by:	jamie
Differential Revision:	https://reviews.freebsd.org/D3017
2015-07-08 16:37:48 +00:00

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/*-
* Copyright (c) 2011 James Gritton.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/jail.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <jail.h>
#define CONF_FILE "/etc/jail.conf"
#define DEP_FROM 0
#define DEP_TO 1
#define DF_SEEN 0x01 /* Dependency has been followed */
#define DF_LIGHT 0x02 /* Implied dependency on jail existence only */
#define DF_NOFAIL 0x04 /* Don't propigate failed jails */
#define PF_VAR 0x01 /* This is a variable, not a true parameter */
#define PF_APPEND 0x02 /* Append to existing parameter list */
#define PF_BAD 0x04 /* Unable to resolve parameter value */
#define PF_INTERNAL 0x08 /* Internal parameter, not passed to kernel */
#define PF_BOOL 0x10 /* Boolean parameter */
#define PF_INT 0x20 /* Integer parameter */
#define PF_CONV 0x40 /* Parameter duplicated in converted form */
#define PF_REV 0x80 /* Run commands in reverse order on stopping */
#define PF_IMMUTABLE 0x100 /* Immutable parameter */
#define JF_START 0x0001 /* -c */
#define JF_SET 0x0002 /* -m */
#define JF_STOP 0x0004 /* -r */
#define JF_DEPEND 0x0008 /* Operation required by dependency */
#define JF_WILD 0x0010 /* Not specified on the command line */
#define JF_FAILED 0x0020 /* Operation failed */
#define JF_PARAMS 0x0040 /* Parameters checked and imported */
#define JF_RDTUN 0x0080 /* Create-only parameter check has been done */
#define JF_PERSIST 0x0100 /* Jail is temporarily persistent */
#define JF_TIMEOUT 0x0200 /* A command (or process kill) timed out */
#define JF_SLEEPQ 0x0400 /* Waiting on a command and/or timeout */
#define JF_OP_MASK (JF_START | JF_SET | JF_STOP)
#define JF_RESTART (JF_START | JF_STOP)
#define JF_START_SET (JF_START | JF_SET)
#define JF_SET_RESTART (JF_SET | JF_STOP)
#define JF_START_SET_RESTART (JF_START | JF_SET | JF_STOP)
#define JF_DO_STOP(js) (((js) & (JF_SET | JF_STOP)) == JF_STOP)
enum intparam {
IP__NULL = 0, /* Null command */
IP_ALLOW_DYING, /* Allow making changes to a dying jail */
IP_COMMAND, /* Command run inside jail at creation */
IP_DEPEND, /* Jail starts after (stops before) another */
IP_EXEC_CLEAN, /* Run commands in a clean environment */
IP_EXEC_CONSOLELOG, /* Redirect optput for commands run in jail */
IP_EXEC_FIB, /* Run jailed commands with this FIB */
IP_EXEC_JAIL_USER, /* Run jailed commands as this user */
IP_EXEC_POSTSTART, /* Commands run outside jail after creating */
IP_EXEC_POSTSTOP, /* Commands run outside jail after removing */
IP_EXEC_PRESTART, /* Commands run outside jail before creating */
IP_EXEC_PRESTOP, /* Commands run outside jail before removing */
IP_EXEC_START, /* Commands run inside jail on creation */
IP_EXEC_STOP, /* Commands run inside jail on removal */
IP_EXEC_SYSTEM_JAIL_USER,/* Get jail_user from system passwd file */
IP_EXEC_SYSTEM_USER, /* Run non-jailed commands as this user */
IP_EXEC_TIMEOUT, /* Time to wait for a command to complete */
#if defined(INET) || defined(INET6)
IP_INTERFACE, /* Add IP addresses to this interface */
IP_IP_HOSTNAME, /* Get jail IP address(es) from hostname */
#endif
IP_MOUNT, /* Mount points in fstab(5) form */
IP_MOUNT_DEVFS, /* Mount /dev under prison root */
IP_MOUNT_FDESCFS, /* Mount /dev/fd under prison root */
IP_MOUNT_PROCFS, /* Mount /proc under prison root */
IP_MOUNT_FSTAB, /* A standard fstab(5) file */
IP_STOP_TIMEOUT, /* Time to wait after sending SIGTERM */
IP_VNET_INTERFACE, /* Assign interface(s) to vnet jail */
#ifdef INET
IP__IP4_IFADDR, /* Copy of ip4.addr with interface/netmask */
#endif
#ifdef INET6
IP__IP6_IFADDR, /* Copy of ip6.addr with interface/prefixlen */
#endif
IP__MOUNT_FROM_FSTAB, /* Line from mount.fstab file */
IP__OP, /* Placeholder for requested operation */
KP_ALLOW_CHFLAGS,
KP_ALLOW_MOUNT,
KP_ALLOW_RAW_SOCKETS,
KP_ALLOW_SET_HOSTNAME,
KP_ALLOW_SOCKET_AF,
KP_ALLOW_SYSVIPC,
KP_DEVFS_RULESET,
KP_ENFORCE_STATFS,
KP_HOST_HOSTNAME,
#ifdef INET
KP_IP4_ADDR,
#endif
#ifdef INET6
KP_IP6_ADDR,
#endif
KP_JID,
KP_NAME,
KP_PATH,
KP_PERSIST,
KP_SECURELEVEL,
KP_VNET,
IP_NPARAM
};
STAILQ_HEAD(cfvars, cfvar);
struct cfvar {
STAILQ_ENTRY(cfvar) tq;
char *name;
size_t pos;
};
TAILQ_HEAD(cfstrings, cfstring);
struct cfstring {
TAILQ_ENTRY(cfstring) tq;
char *s;
size_t len;
struct cfvars vars;
};
TAILQ_HEAD(cfparams, cfparam);
struct cfparam {
TAILQ_ENTRY(cfparam) tq;
char *name;
struct cfstrings val;
unsigned flags;
int gen;
};
TAILQ_HEAD(cfjails, cfjail);
STAILQ_HEAD(cfdepends, cfdepend);
struct cfjail {
TAILQ_ENTRY(cfjail) tq;
char *name;
char *comline;
struct cfparams params;
struct cfdepends dep[2];
struct cfjails *queue;
struct cfparam *intparams[IP_NPARAM];
struct cfstring *comstring;
struct jailparam *jp;
struct timespec timeout;
const enum intparam *comparam;
unsigned flags;
int jid;
int seq;
int pstatus;
int ndeps;
int njp;
int nprocs;
};
struct cfdepend {
STAILQ_ENTRY(cfdepend) tq[2];
struct cfjail *j[2];
unsigned flags;
};
extern void *emalloc(size_t);
extern void *erealloc(void *, size_t);
extern char *estrdup(const char *);
extern int create_jail(struct cfjail *j);
extern void failed(struct cfjail *j);
extern void jail_note(const struct cfjail *j, const char *fmt, ...);
extern void jail_warnx(const struct cfjail *j, const char *fmt, ...);
extern int next_command(struct cfjail *j);
extern int finish_command(struct cfjail *j);
extern struct cfjail *next_proc(int nonblock);
extern void load_config(void);
extern struct cfjail *add_jail(void);
extern void add_param(struct cfjail *j, const struct cfparam *p,
enum intparam ipnum, const char *value);
extern int bool_param(const struct cfparam *p);
extern int int_param(const struct cfparam *p, int *ip);
extern const char *string_param(const struct cfparam *p);
extern int check_intparams(struct cfjail *j);
extern int import_params(struct cfjail *j);
extern int equalopts(const char *opt1, const char *opt2);
extern int wild_jail_name(const char *wname);
extern int wild_jail_match(const char *jname, const char *wname);
extern void dep_setup(int docf);
extern int dep_check(struct cfjail *j);
extern void dep_done(struct cfjail *j, unsigned flags);
extern void dep_reset(struct cfjail *j);
extern struct cfjail *next_jail(void);
extern int start_state(const char *target, int docf, unsigned state,
int running);
extern void requeue(struct cfjail *j, struct cfjails *queue);
extern void yyerror(const char *);
extern int yylex(void);
extern struct cfjails cfjails;
extern struct cfjails ready;
extern struct cfjails depend;
extern const char *cfname;
extern int iflag;
extern int note_remove;
extern int paralimit;
extern int verbose;
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