1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #include <sys/param.h> 30 #include <sys/types.h> 31 #include <sys/jail.h> 32 #include <sys/queue.h> 33 #include <sys/time.h> 34 35 #include <jail.h> 36 #include <stdio.h> 37 38 #define CONF_FILE "/etc/jail.conf" 39 40 #define DEP_FROM 0 41 #define DEP_TO 1 42 43 #define DF_SEEN 0x01 /* Dependency has been followed */ 44 #define DF_LIGHT 0x02 /* Implied dependency on jail existence only */ 45 #define DF_NOFAIL 0x04 /* Don't propagate failed jails */ 46 47 #define PF_VAR 0x0001 /* This is a variable, not a true parameter */ 48 #define PF_APPEND 0x0002 /* Append to existing parameter list */ 49 #define PF_BAD 0x0004 /* Unable to resolve parameter value */ 50 #define PF_INTERNAL 0x0008 /* Internal parameter, not passed to kernel */ 51 #define PF_BOOL 0x0010 /* Boolean parameter */ 52 #define PF_INT 0x0020 /* Integer parameter */ 53 #define PF_CONV 0x0040 /* Parameter duplicated in converted form */ 54 #define PF_REV 0x0080 /* Run commands in reverse order on stopping */ 55 #define PF_IMMUTABLE 0x0100 /* Immutable parameter */ 56 #define PF_NAMEVAL 0x0200 /* Parameter is in "name value" form */ 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 79 enum 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 }; 141 142 STAILQ_HEAD(cfvars, cfvar); 143 144 struct cfvar { 145 STAILQ_ENTRY(cfvar) tq; 146 char *name; 147 size_t pos; 148 }; 149 150 TAILQ_HEAD(cfstrings, cfstring); 151 152 struct cfstring { 153 TAILQ_ENTRY(cfstring) tq; 154 char *s; 155 size_t len; 156 struct cfvars vars; 157 }; 158 159 TAILQ_HEAD(cfparams, cfparam); 160 161 struct cfparam { 162 TAILQ_ENTRY(cfparam) tq; 163 char *name; 164 struct cfstrings val; 165 unsigned flags; 166 int gen; 167 }; 168 169 TAILQ_HEAD(cfjails, cfjail); 170 STAILQ_HEAD(cfdepends, cfdepend); 171 172 struct 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 cfjail *cfparent; 180 struct cfparam *intparams[IP_NPARAM]; 181 struct cfstring *comstring; 182 struct jailparam *jp; 183 struct timespec timeout; 184 const enum intparam *comparam; 185 unsigned flags; 186 int jid; 187 int seq; 188 int pstatus; 189 int ndeps; 190 int njp; 191 int nprocs; 192 }; 193 194 struct cfdepend { 195 STAILQ_ENTRY(cfdepend) tq[2]; 196 struct cfjail *j[2]; 197 unsigned flags; 198 }; 199 200 struct cflex { 201 const char *cfname; 202 int error; 203 }; 204 205 extern void *emalloc(size_t); 206 extern void *erealloc(void *, size_t); 207 extern char *estrdup(const char *); 208 extern int create_jail(struct cfjail *j); 209 extern void failed(struct cfjail *j); 210 extern void jail_note(const struct cfjail *j, const char *fmt, ...); 211 extern void jail_warnx(const struct cfjail *j, const char *fmt, ...); 212 213 extern int next_command(struct cfjail *j); 214 extern int finish_command(struct cfjail *j); 215 extern struct cfjail *next_proc(int nonblock); 216 217 extern void load_config(const char *cfname); 218 extern void include_config(void *scanner, const char *cfname); 219 extern struct cfjail *add_jail(void); 220 extern void add_param(struct cfjail *j, const struct cfparam *p, 221 enum intparam ipnum, const char *value); 222 extern int bool_param(const struct cfparam *p); 223 extern int int_param(const struct cfparam *p, int *ip); 224 extern const char *string_param(const struct cfparam *p); 225 extern int check_intparams(struct cfjail *j); 226 extern int import_params(struct cfjail *j); 227 extern int equalopts(const char *opt1, const char *opt2); 228 extern int wild_jail_name(const char *wname); 229 extern int wild_jail_match(const char *jname, const char *wname); 230 extern void free_param_strings(struct cfparam *p); 231 232 extern void dep_setup(int docf); 233 extern int dep_check(struct cfjail *j); 234 extern void dep_done(struct cfjail *j, unsigned flags); 235 extern void dep_reset(struct cfjail *j); 236 extern struct cfjail *next_jail(void); 237 extern int start_state(const char *target, int docf, unsigned state, 238 int running); 239 extern void requeue(struct cfjail *j, struct cfjails *queue); 240 extern void requeue_head(struct cfjail *j, struct cfjails *queue); 241 242 extern struct cflex *yyget_extra(void *scanner); 243 extern FILE *yyget_in(void *scanner); 244 extern int yyget_lineno(void *scanner); 245 extern char *yyget_text(void *scanner); 246 247 extern struct cfjails cfjails; 248 extern struct cfjails ready; 249 extern struct cfjails depend; 250 extern int iflag; 251 extern int note_remove; 252 extern int paralimit; 253 extern int verbose; 254