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freebsd-dev/lib/libjail/jail.c
Jamie Gritton 0e5c6bd436 Make it easier for filesystems to count themselves as jail-enabled, 
by doing most of the work in a new function prison_add_vfs in kern_jail.c
Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and
the rest is taken care of.  This includes adding a jail parameter like
allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed.
Both of these used to be a static list of known filesystems, with
predefined permission bits.

Reviewed by:	kib
Differential Revision:	D14681
2018-05-04 20:54:27 +00:00

1115 lines
28 KiB
C
Raw Blame History

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/jail.h>
#include <sys/linker.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "jail.h"
#define SJPARAM "security.jail.param"
#define JPS_IN_ADDR 1
#define JPS_IN6_ADDR 2
#define ARRAY_SANITY 5
#define ARRAY_SLOP 5
static int jailparam_import_enum(const char **values, int nvalues,
const char *valstr, size_t valsize, int *value);
static int jailparam_type(struct jailparam *jp);
static int kldload_param(const char *name);
static char *noname(const char *name);
static char *nononame(const char *name);
char jail_errmsg[JAIL_ERRMSGLEN];
static const char *bool_values[] = { "false", "true" };
static const char *jailsys_values[] = { "disable", "new", "inherit" };
/*
* Import a null-terminated parameter list and set a jail with the flags
* and parameters.
*/
int
jail_setv(int flags, ...)
{
va_list ap, tap;
struct jailparam *jp;
const char *name, *value;
int njp, jid;
/* Create the parameter list and import the parameters. */
va_start(ap, flags);
va_copy(tap, ap);
for (njp = 0; va_arg(tap, char *) != NULL; njp++)
(void)va_arg(tap, char *);
va_end(tap);
jp = alloca(njp * sizeof(struct jailparam));
for (njp = 0; (name = va_arg(ap, char *)) != NULL;) {
value = va_arg(ap, char *);
if (jailparam_init(jp + njp, name) < 0)
goto error;
if (jailparam_import(jp + njp++, value) < 0)
goto error;
}
va_end(ap);
jid = jailparam_set(jp, njp, flags);
jailparam_free(jp, njp);
return (jid);
error:
jailparam_free(jp, njp);
va_end(ap);
return (-1);
}
/*
* Read a null-terminated parameter list, get the referenced jail, and export
* the parameters to the list.
*/
int
jail_getv(int flags, ...)
{
va_list ap, tap;
struct jailparam *jp, *jp_lastjid, *jp_jid, *jp_name, *jp_key;
char *valarg, *value;
const char *name, *key_value, *lastjid_value, *jid_value, *name_value;
int njp, i, jid;
/* Create the parameter list and find the key. */
va_start(ap, flags);
va_copy(tap, ap);
for (njp = 0; va_arg(tap, char *) != NULL; njp++)
(void)va_arg(tap, char *);
va_end(tap);
jp = alloca(njp * sizeof(struct jailparam));
va_copy(tap, ap);
jp_lastjid = jp_jid = jp_name = NULL;
lastjid_value = jid_value = name_value = NULL;
for (njp = 0; (name = va_arg(tap, char *)) != NULL; njp++) {
value = va_arg(tap, char *);
if (jailparam_init(jp + njp, name) < 0) {
va_end(tap);
goto error;
}
if (!strcmp(jp[njp].jp_name, "lastjid")) {
jp_lastjid = jp + njp;
lastjid_value = value;
} else if (!strcmp(jp[njp].jp_name, "jid")) {
jp_jid = jp + njp;
jid_value = value;
} if (!strcmp(jp[njp].jp_name, "name")) {
jp_name = jp + njp;
name_value = value;
}
}
va_end(tap);
/* Import the key parameter. */
if (jp_lastjid != NULL) {
jp_key = jp_lastjid;
key_value = lastjid_value;
} else if (jp_jid != NULL && strtol(jid_value, NULL, 10) != 0) {
jp_key = jp_jid;
key_value = jid_value;
} else if (jp_name != NULL) {
jp_key = jp_name;
key_value = name_value;
} else {
strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN);
errno = ENOENT;
goto error;
}
if (jailparam_import(jp_key, key_value) < 0)
goto error;
/* Get the jail and export the parameters. */
jid = jailparam_get(jp, njp, flags);
if (jid < 0)
goto error;
for (i = 0; i < njp; i++) {
(void)va_arg(ap, char *);
valarg = va_arg(ap, char *);
if (jp + i != jp_key) {
/* It's up to the caller to ensure there's room. */
if ((jp[i].jp_ctltype & CTLTYPE) == CTLTYPE_STRING)
strcpy(valarg, jp[i].jp_value);
else {
value = jailparam_export(jp + i);
if (value == NULL)
goto error;
strcpy(valarg, value);
free(value);
}
}
}
jailparam_free(jp, njp);
va_end(ap);
return (jid);
error:
jailparam_free(jp, njp);
va_end(ap);
return (-1);
}
/*
* Return a list of all known parameters.
*/
int
jailparam_all(struct jailparam **jpp)
{
struct jailparam *jp, *tjp;
size_t mlen1, mlen2, buflen;
unsigned njp, nlist;
int mib1[CTL_MAXNAME], mib2[CTL_MAXNAME - 2];
char buf[MAXPATHLEN];
njp = 0;
nlist = 32;
jp = malloc(nlist * sizeof(*jp));
if (jp == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (-1);
}
mib1[0] = 0;
mib1[1] = 2;
mlen1 = CTL_MAXNAME - 2;
if (sysctlnametomib(SJPARAM, mib1 + 2, &mlen1) < 0) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctlnametomib(" SJPARAM "): %s", strerror(errno));
goto error;
}
for (;; njp++) {
/* Get the next parameter. */
mlen2 = sizeof(mib2);
if (sysctl(mib1, mlen1 + 2, mib2, &mlen2, NULL, 0) < 0) {
if (errno == ENOENT) {
/* No more entries. */
break;
}
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(0.2): %s", strerror(errno));
goto error;
}
if (mib2[0] != mib1[2] ||
mib2[1] != mib1[3] ||
mib2[2] != mib1[4])
break;
/* Convert it to an ascii name. */
memcpy(mib1 + 2, mib2, mlen2);
mlen1 = mlen2 / sizeof(int);
mib1[1] = 1;
buflen = sizeof(buf);
if (sysctl(mib1, mlen1 + 2, buf, &buflen, NULL, 0) < 0) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(0.1): %s", strerror(errno));
goto error;
}
if (buf[buflen - 2] == '.')
buf[buflen - 2] = '\0';
/* Add the parameter to the list */
if (njp >= nlist) {
nlist *= 2;
tjp = reallocarray(jp, nlist, sizeof(*jp));
if (tjp == NULL)
goto error;
jp = tjp;
}
if (jailparam_init(jp + njp, buf + sizeof(SJPARAM)) < 0)
goto error;
mib1[1] = 2;
}
jp = reallocarray(jp, njp, sizeof(*jp));
*jpp = jp;
return (njp);
error:
jailparam_free(jp, njp);
free(jp);
return (-1);
}
/*
* Clear a jail parameter and copy in its name.
*/
int
jailparam_init(struct jailparam *jp, const char *name)
{
memset(jp, 0, sizeof(*jp));
jp->jp_name = strdup(name);
if (jp->jp_name == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (-1);
}
if (jailparam_type(jp) < 0) {
jailparam_free(jp, 1);
jp->jp_name = NULL;
jp->jp_value = NULL;
return (-1);
}
return (0);
}
/*
* Put a name and value into a jail parameter element, converting the value
* to internal form.
*/
int
jailparam_import(struct jailparam *jp, const char *value)
{
char *p, *ep, *tvalue;
const char *avalue;
int i, nval, fw;
if (value == NULL)
return (0);
if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) {
jp->jp_value = strdup(value);
if (jp->jp_value == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (-1);
}
return (0);
}
nval = 1;
if (jp->jp_elemlen) {
if (value[0] == '\0' || (value[0] == '-' && value[1] == '\0')) {
jp->jp_value = strdup("");
if (jp->jp_value == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (-1);
}
jp->jp_valuelen = 0;
return (0);
}
for (p = strchr(value, ','); p; p = strchr(p + 1, ','))
nval++;
jp->jp_valuelen = jp->jp_elemlen * nval;
}
jp->jp_value = malloc(jp->jp_valuelen);
if (jp->jp_value == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (-1);
}
avalue = value;
for (i = 0; i < nval; i++) {
fw = nval == 1 ? strlen(avalue) : strcspn(avalue, ",");
switch (jp->jp_ctltype & CTLTYPE) {
case CTLTYPE_INT:
if (jp->jp_flags & (JP_BOOL | JP_NOBOOL)) {
if (!jailparam_import_enum(bool_values, 2,
avalue, fw, &((int *)jp->jp_value)[i])) {
snprintf(jail_errmsg,
JAIL_ERRMSGLEN, "%s: "
"unknown boolean value \"%.*s\"",
jp->jp_name, fw, avalue);
errno = EINVAL;
goto error;
}
break;
}
if (jp->jp_flags & JP_JAILSYS) {
/*
* Allow setting a jailsys parameter to "new"
* in a booleanesque fashion.
*/
if (value[0] == '\0')
((int *)jp->jp_value)[i] = JAIL_SYS_NEW;
else if (!jailparam_import_enum(jailsys_values,
sizeof(jailsys_values) /
sizeof(jailsys_values[0]), avalue, fw,
&((int *)jp->jp_value)[i])) {
snprintf(jail_errmsg,
JAIL_ERRMSGLEN, "%s: "
"unknown jailsys value \"%.*s\"",
jp->jp_name, fw, avalue);
errno = EINVAL;
goto error;
}
break;
}
((int *)jp->jp_value)[i] = strtol(avalue, &ep, 10);
integer_test:
if (ep != avalue + fw) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"%s: non-integer value \"%.*s\"",
jp->jp_name, fw, avalue);
errno = EINVAL;
goto error;
}
break;
case CTLTYPE_UINT:
((unsigned *)jp->jp_value)[i] =
strtoul(avalue, &ep, 10);
goto integer_test;
case CTLTYPE_LONG:
((long *)jp->jp_value)[i] = strtol(avalue, &ep, 10);
goto integer_test;
case CTLTYPE_ULONG:
((unsigned long *)jp->jp_value)[i] =
strtoul(avalue, &ep, 10);
goto integer_test;
case CTLTYPE_S64:
((int64_t *)jp->jp_value)[i] =
strtoimax(avalue, &ep, 10);
goto integer_test;
case CTLTYPE_U64:
((uint64_t *)jp->jp_value)[i] =
strtoumax(avalue, &ep, 10);
goto integer_test;
case CTLTYPE_STRUCT:
tvalue = alloca(fw + 1);
strlcpy(tvalue, avalue, fw + 1);
switch (jp->jp_structtype) {
case JPS_IN_ADDR:
if (inet_pton(AF_INET, tvalue,
&((struct in_addr *)jp->jp_value)[i]) != 1)
{
snprintf(jail_errmsg,
JAIL_ERRMSGLEN,
"%s: not an IPv4 address: %s",
jp->jp_name, tvalue);
errno = EINVAL;
goto error;
}
break;
case JPS_IN6_ADDR:
if (inet_pton(AF_INET6, tvalue,
&((struct in6_addr *)jp->jp_value)[i]) != 1)
{
snprintf(jail_errmsg,
JAIL_ERRMSGLEN,
"%s: not an IPv6 address: %s",
jp->jp_name, tvalue);
errno = EINVAL;
goto error;
}
break;
default:
goto unknown_type;
}
break;
default:
unknown_type:
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"unknown type for %s", jp->jp_name);
errno = ENOENT;
goto error;
}
avalue += fw + 1;
}
return (0);
error:
free(jp->jp_value);
jp->jp_value = NULL;
return (-1);
}
static int
jailparam_import_enum(const char **values, int nvalues, const char *valstr,
size_t valsize, int *value)
{
char *ep;
int i;
for (i = 0; i < nvalues; i++)
if (valsize == strlen(values[i]) &&
!strncasecmp(valstr, values[i], valsize)) {
*value = i;
return 1;
}
*value = strtol(valstr, &ep, 10);
return (ep == valstr + valsize);
}
/*
* Put a name and value into a jail parameter element, copying the value
* but not altering it.
*/
int
jailparam_import_raw(struct jailparam *jp, void *value, size_t valuelen)
{
jp->jp_value = value;
jp->jp_valuelen = valuelen;
jp->jp_flags |= JP_RAWVALUE;
return (0);
}
/*
* Run the jail_set and jail_get system calls on a parameter list.
*/
int
jailparam_set(struct jailparam *jp, unsigned njp, int flags)
{
struct iovec *jiov;
char *nname;
int i, jid, bool0;
unsigned j;
jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1));
bool0 = 0;
for (i = j = 0; j < njp; j++) {
jiov[i].iov_base = jp[j].jp_name;
jiov[i].iov_len = strlen(jp[j].jp_name) + 1;
i++;
if (jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) {
/*
* Set booleans without values. If one has a value of
* zero, change it to (or from) its "no" counterpart.
*/
jiov[i].iov_base = NULL;
jiov[i].iov_len = 0;
if (jp[j].jp_value != NULL &&
jp[j].jp_valuelen == sizeof(int) &&
!*(int *)jp[j].jp_value) {
bool0 = 1;
nname = jp[j].jp_flags & JP_BOOL
? noname(jp[j].jp_name)
: nononame(jp[j].jp_name);
if (nname == NULL) {
njp = j;
jid = -1;
goto done;
}
jiov[i - 1].iov_base = nname;
jiov[i - 1].iov_len = strlen(nname) + 1;
}
} else {
/*
* Try to fill in missing values with an empty string.
*/
if (jp[j].jp_value == NULL && jp[j].jp_valuelen > 0 &&
jailparam_import(jp + j, "") < 0) {
njp = j;
jid = -1;
goto done;
}
jiov[i].iov_base = jp[j].jp_value;
jiov[i].iov_len =
(jp[j].jp_ctltype & CTLTYPE) == CTLTYPE_STRING
? strlen(jp[j].jp_value) + 1
: jp[j].jp_valuelen;
}
i++;
}
jiov[i].iov_base = __DECONST(char *, "errmsg");
jiov[i].iov_len = sizeof("errmsg");
i++;
jiov[i].iov_base = jail_errmsg;
jiov[i].iov_len = JAIL_ERRMSGLEN;
i++;
jail_errmsg[0] = 0;
jid = jail_set(jiov, i, flags);
if (jid < 0 && !jail_errmsg[0])
snprintf(jail_errmsg, sizeof(jail_errmsg), "jail_set: %s",
strerror(errno));
done:
if (bool0)
for (j = 0; j < njp; j++)
if ((jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) &&
jp[j].jp_value != NULL &&
jp[j].jp_valuelen == sizeof(int) &&
!*(int *)jp[j].jp_value)
free(jiov[j * 2].iov_base);
return (jid);
}
int
jailparam_get(struct jailparam *jp, unsigned njp, int flags)
{
struct iovec *jiov;
struct jailparam *jp_lastjid, *jp_jid, *jp_name, *jp_key;
int i, ai, ki, jid, arrays, sanity;
unsigned j;
/*
* Get the types for all parameters.
* Find the key and any array parameters.
*/
jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1));
jp_lastjid = jp_jid = jp_name = NULL;
arrays = 0;
for (ai = j = 0; j < njp; j++) {
if (!strcmp(jp[j].jp_name, "lastjid"))
jp_lastjid = jp + j;
else if (!strcmp(jp[j].jp_name, "jid"))
jp_jid = jp + j;
else if (!strcmp(jp[j].jp_name, "name"))
jp_name = jp + j;
else if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) {
arrays = 1;
jiov[ai].iov_base = jp[j].jp_name;
jiov[ai].iov_len = strlen(jp[j].jp_name) + 1;
ai++;
jiov[ai].iov_base = NULL;
jiov[ai].iov_len = 0;
ai++;
}
}
jp_key = jp_lastjid ? jp_lastjid :
jp_jid && jp_jid->jp_valuelen == sizeof(int) &&
jp_jid->jp_value && *(int *)jp_jid->jp_value ? jp_jid : jp_name;
if (jp_key == NULL || jp_key->jp_value == NULL) {
strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN);
errno = ENOENT;
return (-1);
}
ki = ai;
jiov[ki].iov_base = jp_key->jp_name;
jiov[ki].iov_len = strlen(jp_key->jp_name) + 1;
ki++;
jiov[ki].iov_base = jp_key->jp_value;
jiov[ki].iov_len = (jp_key->jp_ctltype & CTLTYPE) == CTLTYPE_STRING
? strlen(jp_key->jp_value) + 1 : jp_key->jp_valuelen;
ki++;
jiov[ki].iov_base = __DECONST(char *, "errmsg");
jiov[ki].iov_len = sizeof("errmsg");
ki++;
jiov[ki].iov_base = jail_errmsg;
jiov[ki].iov_len = JAIL_ERRMSGLEN;
ki++;
jail_errmsg[0] = 0;
if (arrays && jail_get(jiov, ki, flags) < 0) {
if (!jail_errmsg[0])
snprintf(jail_errmsg, sizeof(jail_errmsg),
"jail_get: %s", strerror(errno));
return (-1);
}
/* Allocate storage for all parameters. */
for (ai = j = 0, i = ki; j < njp; j++) {
if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) {
ai++;
jiov[ai].iov_len += jp[j].jp_elemlen * ARRAY_SLOP;
if (jp[j].jp_valuelen >= jiov[ai].iov_len)
jiov[ai].iov_len = jp[j].jp_valuelen;
else {
jp[j].jp_valuelen = jiov[ai].iov_len;
if (jp[j].jp_value != NULL)
free(jp[j].jp_value);
jp[j].jp_value = malloc(jp[j].jp_valuelen);
if (jp[j].jp_value == NULL) {
strerror_r(errno, jail_errmsg,
JAIL_ERRMSGLEN);
return (-1);
}
}
jiov[ai].iov_base = jp[j].jp_value;
memset(jiov[ai].iov_base, 0, jiov[ai].iov_len);
ai++;
} else if (jp + j != jp_key) {
jiov[i].iov_base = jp[j].jp_name;
jiov[i].iov_len = strlen(jp[j].jp_name) + 1;
i++;
if (jp[j].jp_value == NULL &&
!(jp[j].jp_flags & JP_RAWVALUE)) {
jp[j].jp_value = malloc(jp[j].jp_valuelen);
if (jp[j].jp_value == NULL) {
strerror_r(errno, jail_errmsg,
JAIL_ERRMSGLEN);
return (-1);
}
}
jiov[i].iov_base = jp[j].jp_value;
jiov[i].iov_len = jp[j].jp_valuelen;
memset(jiov[i].iov_base, 0, jiov[i].iov_len);
i++;
}
}
/*
* Get the prison. If there are array elements, retry a few times
* in case their sizes changed from under us.
*/
for (sanity = 0;; sanity++) {
jid = jail_get(jiov, i, flags);
if (jid >= 0 || !arrays || sanity == ARRAY_SANITY ||
errno != EINVAL || jail_errmsg[0])
break;
for (ai = j = 0; j < njp; j++) {
if (jp[j].jp_elemlen &&
!(jp[j].jp_flags & JP_RAWVALUE)) {
ai++;
jiov[ai].iov_base = NULL;
jiov[ai].iov_len = 0;
ai++;
}
}
if (jail_get(jiov, ki, flags) < 0)
break;
for (ai = j = 0; j < njp; j++) {
if (jp[j].jp_elemlen &&
!(jp[j].jp_flags & JP_RAWVALUE)) {
ai++;
jiov[ai].iov_len +=
jp[j].jp_elemlen * ARRAY_SLOP;
if (jp[j].jp_valuelen >= jiov[ai].iov_len)
jiov[ai].iov_len = jp[j].jp_valuelen;
else {
jp[j].jp_valuelen = jiov[ai].iov_len;
if (jp[j].jp_value != NULL)
free(jp[j].jp_value);
jp[j].jp_value =
malloc(jiov[ai].iov_len);
if (jp[j].jp_value == NULL) {
strerror_r(errno, jail_errmsg,
JAIL_ERRMSGLEN);
return (-1);
}
}
jiov[ai].iov_base = jp[j].jp_value;
memset(jiov[ai].iov_base, 0, jiov[ai].iov_len);
ai++;
}
}
}
if (jid < 0 && !jail_errmsg[0])
snprintf(jail_errmsg, sizeof(jail_errmsg),
"jail_get: %s", strerror(errno));
for (ai = j = 0, i = ki; j < njp; j++) {
if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) {
ai++;
jp[j].jp_valuelen = jiov[ai].iov_len;
ai++;
} else if (jp + j != jp_key) {
i++;
jp[j].jp_valuelen = jiov[i].iov_len;
i++;
}
}
return (jid);
}
/*
* Convert a jail parameter's value to external form.
*/
char *
jailparam_export(struct jailparam *jp)
{
size_t *valuelens;
char *value, *tvalue, **values;
size_t valuelen;
int i, nval, ival;
char valbuf[INET6_ADDRSTRLEN];
if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) {
value = strdup(jp->jp_value);
if (value == NULL)
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (value);
}
nval = jp->jp_elemlen ? jp->jp_valuelen / jp->jp_elemlen : 1;
if (nval == 0) {
value = strdup("");
if (value == NULL)
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (value);
}
values = alloca(nval * sizeof(char *));
valuelens = alloca(nval * sizeof(size_t));
valuelen = 0;
for (i = 0; i < nval; i++) {
switch (jp->jp_ctltype & CTLTYPE) {
case CTLTYPE_INT:
ival = ((int *)jp->jp_value)[i];
if ((jp->jp_flags & (JP_BOOL | JP_NOBOOL)) &&
(unsigned)ival < 2) {
strlcpy(valbuf, bool_values[ival],
sizeof(valbuf));
break;
}
if ((jp->jp_flags & JP_JAILSYS) &&
(unsigned)ival < sizeof(jailsys_values) /
sizeof(jailsys_values[0])) {
strlcpy(valbuf, jailsys_values[ival],
sizeof(valbuf));
break;
}
snprintf(valbuf, sizeof(valbuf), "%d", ival);
break;
case CTLTYPE_UINT:
snprintf(valbuf, sizeof(valbuf), "%u",
((unsigned *)jp->jp_value)[i]);
break;
case CTLTYPE_LONG:
snprintf(valbuf, sizeof(valbuf), "%ld",
((long *)jp->jp_value)[i]);
break;
case CTLTYPE_ULONG:
snprintf(valbuf, sizeof(valbuf), "%lu",
((unsigned long *)jp->jp_value)[i]);
break;
case CTLTYPE_S64:
snprintf(valbuf, sizeof(valbuf), "%jd",
(intmax_t)((int64_t *)jp->jp_value)[i]);
break;
case CTLTYPE_U64:
snprintf(valbuf, sizeof(valbuf), "%ju",
(uintmax_t)((uint64_t *)jp->jp_value)[i]);
break;
case CTLTYPE_STRUCT:
switch (jp->jp_structtype) {
case JPS_IN_ADDR:
if (inet_ntop(AF_INET,
&((struct in_addr *)jp->jp_value)[i],
valbuf, sizeof(valbuf)) == NULL) {
strerror_r(errno, jail_errmsg,
JAIL_ERRMSGLEN);
return (NULL);
}
break;
case JPS_IN6_ADDR:
if (inet_ntop(AF_INET6,
&((struct in6_addr *)jp->jp_value)[i],
valbuf, sizeof(valbuf)) == NULL) {
strerror_r(errno, jail_errmsg,
JAIL_ERRMSGLEN);
return (NULL);
}
break;
default:
goto unknown_type;
}
break;
default:
unknown_type:
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"unknown type for %s", jp->jp_name);
errno = ENOENT;
return (NULL);
}
valuelens[i] = strlen(valbuf) + 1;
valuelen += valuelens[i];
values[i] = alloca(valuelens[i]);
strcpy(values[i], valbuf);
}
value = malloc(valuelen);
if (value == NULL)
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
else {
tvalue = value;
for (i = 0; i < nval; i++) {
strcpy(tvalue, values[i]);
if (i < nval - 1) {
tvalue += valuelens[i];
tvalue[-1] = ',';
}
}
}
return (value);
}
/*
* Free the contents of a jail parameter list (but not the list itself).
*/
void
jailparam_free(struct jailparam *jp, unsigned njp)
{
unsigned j;
for (j = 0; j < njp; j++) {
free(jp[j].jp_name);
if (!(jp[j].jp_flags & JP_RAWVALUE))
free(jp[j].jp_value);
}
}
/*
* Find a parameter's type and size from its MIB.
*/
static int
jailparam_type(struct jailparam *jp)
{
char *p, *name, *nname;
size_t miblen, desclen;
int i, isarray;
struct {
int i;
char s[MAXPATHLEN];
} desc;
int mib[CTL_MAXNAME];
/* The "lastjid" parameter isn't real. */
name = jp->jp_name;
if (!strcmp(name, "lastjid")) {
jp->jp_valuelen = sizeof(int);
jp->jp_ctltype = CTLTYPE_INT | CTLFLAG_WR;
return (0);
}
/* Find the sysctl that describes the parameter. */
mib[0] = 0;
mib[1] = 3;
snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", name);
miblen = sizeof(mib) - 2 * sizeof(int);
if (sysctl(mib, 2, mib + 2, &miblen, desc.s, strlen(desc.s)) < 0) {
if (errno != ENOENT) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(0.3.%s): %s", name, strerror(errno));
return (-1);
}
if (kldload_param(name) >= 0 && sysctl(mib, 2, mib + 2, &miblen,
desc.s, strlen(desc.s)) >= 0)
goto mib_desc;
/*
* The parameter probably doesn't exist. But it might be
* the "no" counterpart to a boolean.
*/
nname = nononame(name);
if (nname == NULL) {
unknown_parameter:
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"unknown parameter: %s", jp->jp_name);
errno = ENOENT;
return (-1);
}
name = alloca(strlen(nname) + 1);
strcpy(name, nname);
free(nname);
snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", name);
miblen = sizeof(mib) - 2 * sizeof(int);
if (sysctl(mib, 2, mib + 2, &miblen, desc.s,
strlen(desc.s)) < 0)
goto unknown_parameter;
jp->jp_flags |= JP_NOBOOL;
}
mib_desc:
mib[1] = 4;
desclen = sizeof(desc);
if (sysctl(mib, (miblen / sizeof(int)) + 2, &desc, &desclen,
NULL, 0) < 0) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(0.4.%s): %s", name, strerror(errno));
return (-1);
}
jp->jp_ctltype = desc.i;
/* If this came from removing a "no", it better be a boolean. */
if (jp->jp_flags & JP_NOBOOL) {
if ((desc.i & CTLTYPE) == CTLTYPE_INT && desc.s[0] == 'B') {
jp->jp_valuelen = sizeof(int);
return (0);
}
else if ((desc.i & CTLTYPE) != CTLTYPE_NODE)
goto unknown_parameter;
}
/* See if this is an array type. */
p = strchr(desc.s, '\0');
isarray = 0;
if (p - 2 < desc.s || strcmp(p - 2, ",a"))
isarray = 0;
else {
isarray = 1;
p[-2] = 0;
}
/* Look for types we understand. */
switch (desc.i & CTLTYPE) {
case CTLTYPE_INT:
if (desc.s[0] == 'B')
jp->jp_flags |= JP_BOOL;
else if (!strcmp(desc.s, "E,jailsys"))
jp->jp_flags |= JP_JAILSYS;
case CTLTYPE_UINT:
jp->jp_valuelen = sizeof(int);
break;
case CTLTYPE_LONG:
case CTLTYPE_ULONG:
jp->jp_valuelen = sizeof(long);
break;
case CTLTYPE_S64:
case CTLTYPE_U64:
jp->jp_valuelen = sizeof(int64_t);
break;
case CTLTYPE_STRING:
desc.s[0] = 0;
desclen = sizeof(desc.s);
if (sysctl(mib + 2, miblen / sizeof(int), desc.s, &desclen,
NULL, 0) < 0) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(" SJPARAM ".%s): %s", name,
strerror(errno));
return (-1);
}
jp->jp_valuelen = strtoul(desc.s, NULL, 10);
break;
case CTLTYPE_STRUCT:
if (!strcmp(desc.s, "S,in_addr")) {
jp->jp_structtype = JPS_IN_ADDR;
jp->jp_valuelen = sizeof(struct in_addr);
} else if (!strcmp(desc.s, "S,in6_addr")) {
jp->jp_structtype = JPS_IN6_ADDR;
jp->jp_valuelen = sizeof(struct in6_addr);
} else {
desclen = 0;
if (sysctl(mib + 2, miblen / sizeof(int),
NULL, &jp->jp_valuelen, NULL, 0) < 0) {
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(" SJPARAM ".%s): %s", name,
strerror(errno));
return (-1);
}
}
break;
case CTLTYPE_NODE:
/*
* A node might be described by an empty-named child,
* which would be immediately before or after the node itself.
*/
mib[1] = 1;
miblen += sizeof(int);
for (i = -1; i <= 1; i += 2) {
mib[(miblen / sizeof(int)) + 1] =
mib[(miblen / sizeof(int))] + i;
desclen = sizeof(desc.s);
if (sysctl(mib, (miblen / sizeof(int)) + 2, desc.s,
&desclen, NULL, 0) < 0) {
if (errno == ENOENT)
continue;
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"sysctl(0.1): %s", strerror(errno));
return (-1);
}
if (desclen == sizeof(SJPARAM) + strlen(name) + 2 &&
memcmp(SJPARAM ".", desc.s, sizeof(SJPARAM)) == 0 &&
memcmp(name, desc.s + sizeof(SJPARAM),
desclen - sizeof(SJPARAM) - 2) == 0 &&
desc.s[desclen - 2] == '.')
goto mib_desc;
}
goto unknown_parameter;
default:
snprintf(jail_errmsg, JAIL_ERRMSGLEN,
"unknown type for %s", jp->jp_name);
errno = ENOENT;
return (-1);
}
if (isarray) {
jp->jp_elemlen = jp->jp_valuelen;
jp->jp_valuelen = 0;
}
return (0);
}
/*
* Attempt to load a kernel module matching an otherwise nonexistent parameter.
*/
static int
kldload_param(const char *name)
{
int kl;
if (strcmp(name, "linux") == 0 || strncmp(name, "linux.", 6) == 0)
kl = kldload("linux");
else if (strcmp(name, "sysvmsg") == 0 || strcmp(name, "sysvsem") == 0 ||
strcmp(name, "sysvshm") == 0)
kl = kldload(name);
else if (strncmp(name, "allow.mount.", 12) == 0) {
/* Load the matching filesystem */
kl = kldload(name + 12);
if (kl < 0 && errno == ENOENT &&
strncmp(name + 12, "no", 2) == 0)
kl = kldload(name + 14);
} else {
errno = ENOENT;
return (-1);
}
if (kl < 0 && errno == EEXIST) {
/*
* In the module is already loaded, then it must not contain
* the parameter.
*/
errno = ENOENT;
}
return kl;
}
/*
* Change a boolean parameter name into its "no" counterpart or vice versa.
*/
static char *
noname(const char *name)
{
char *nname, *p;
nname = malloc(strlen(name) + 3);
if (nname == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (NULL);
}
p = strrchr(name, '.');
if (p != NULL)
sprintf(nname, "%.*s.no%s", (int)(p - name), name, p + 1);
else
sprintf(nname, "no%s", name);
return (nname);
}
static char *
nononame(const char *name)
{
char *p, *nname;
p = strrchr(name, '.');
if (strncmp(p ? p + 1 : name, "no", 2)) {
snprintf(jail_errmsg, sizeof(jail_errmsg),
"mismatched boolean: %s", name);
errno = EINVAL;
return (NULL);
}
nname = malloc(strlen(name) - 1);
if (nname == NULL) {
strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
return (NULL);
}
if (p != NULL)
sprintf(nname, "%.*s.%s", (int)(p - name), name, p + 3);
else
strcpy(nname, name + 2);
return (nname);
}
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