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- Attempt to help declutter kern. sysctl by moving security out from

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beneath it.

Reviewed by: rwatson
This commit is contained in:
arr 2002-01-16 06:55:30 +00:00
parent 0ed7ba2c74
commit 1ae1e4e3f2
8 changed files with 30 additions and 29 deletions
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10
sbin/sysctl/sysctl.8
View File

@ -136,7 +136,7 @@ For a detailed description of these variable see
.Pp
The changeable column indicates whether a process with appropriate
privilege can change the value.
.Bl -column kern.security.bsd.unprivileged_read_msgbuf integerxxx
.Bl -column security.bsd.unprivileged_read_msgbuf integerxxx
.It Sy "Name Type Changeable
.It "kern.ostype string no
.It "kern.osrelease string no
@ -165,10 +165,10 @@ privilege can change the value.
.It "kern.bootfile string yes
.It "kern.corefile string yes
.It "kern.logsigexit integer yes
.It "kern.security.bsd.suser_enabled integer yes
.It "kern.security.bsd.see_other_uids integer yes
.It "kern.security.bsd.unprivileged_proc_debug integer yes
.It "kern.security.bsd.unprivileged_read_msgbuf integer yes
.It "security.bsd.suser_enabled integer yes
.It "security.bsd.see_other_uids integer yes
.It "security.bsd.unprivileged_proc_debug integer yes
.It "security.bsd.unprivileged_read_msgbuf integer yes
.It "vm.loadavg struct no
.It "hw.machine string no
.It "hw.model string no

2
share/doc/papers/jail/mgt.ms
View File

@ -193,7 +193,7 @@ jails to set the hostname of the jail, which makes the status file less
useful from a management perspective if the contents of the jail are
malicious.
To prevent a jail from changing its hostname, the
"kern.security.jail.set_hostname_allowed" sysctl may be set to 0 prior to
"security.jail.set_hostname_allowed" sysctl may be set to 0 prior to
starting any jails.
.PP
One aspect immediately observable in an environment with multiple jails

4
sys/kern/kern_cap.c
View File

@ -61,9 +61,9 @@
static int capabilities_enabled = 0;
SYSCTL_NODE(_kern_security, OID_AUTO, capabilities, CTLFLAG_RW, 0,
SYSCTL_NODE(_security, OID_AUTO, capabilities, CTLFLAG_RW, 0,
"POSIX.1e Capabilities");
SYSCTL_INT(_kern_security_capabilities, OID_AUTO, enabled, CTLFLAG_RW,
SYSCTL_INT(_security_capabilities, OID_AUTO, enabled, CTLFLAG_RW,
&capabilities_enabled, 0, "POSIX.1e Capabilities enabled");
#endif

10
sys/kern/kern_jail.c
View File

@ -28,24 +28,24 @@
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
SYSCTL_DECL(_kern_security);
SYSCTL_NODE(_kern_security, OID_AUTO, jail, CTLFLAG_RW, 0,
SYSCTL_DECL(_security);
SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
"Jail rules");
mp_fixme("these variables need a lock")
int jail_set_hostname_allowed = 1;
SYSCTL_INT(_kern_security_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
SYSCTL_INT(_security_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
&jail_set_hostname_allowed, 0,
"Processes in jail can set their hostnames");
int jail_socket_unixiproute_only = 1;
SYSCTL_INT(_kern_security_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
SYSCTL_INT(_security_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
&jail_socket_unixiproute_only, 0,
"Processes in jail are limited to creating UNIX/IPv4/route sockets only");
int jail_sysvipc_allowed = 0;
SYSCTL_INT(_kern_security_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
SYSCTL_INT(_security_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
&jail_sysvipc_allowed, 0,
"Processes in jail can use System V IPC primitives");

2
sys/kern/kern_mib.c
View File

@ -77,6 +77,8 @@ SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
"Compatibility code");
SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
"Security");
#ifdef REGRESSION
SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
"Regression test MIB");

15
sys/kern/kern_prot.c
View File

@ -63,9 +63,8 @@
static MALLOC_DEFINE(M_CRED, "cred", "credentials");
SYSCTL_NODE(_kern, OID_AUTO, security, CTLFLAG_RW, 0,
"Kernel security policy");
SYSCTL_NODE(_kern_security, OID_AUTO, bsd, CTLFLAG_RW, 0,
SYSCTL_DECL(_security);
SYSCTL_NODE(_security, OID_AUTO, bsd, CTLFLAG_RW, 0,
"BSD security policy");
#ifndef _SYS_SYSPROTO_H_
@ -1190,7 +1189,7 @@ groupmember(gid, cred)
}
/*
* `suser_enabled' (which can be set by the kern.security.suser_enabled
* `suser_enabled' (which can be set by the security.suser_enabled
* sysctl) determines whether the system 'super-user' policy is in effect.
* If it is nonzero, an effective uid of 0 connotes special privilege,
* overriding many mandatory and discretionary protections. If it is zero,
@ -1200,9 +1199,9 @@ groupmember(gid, cred)
* consideration of the consequences.
*/
int suser_enabled = 1;
SYSCTL_INT(_kern_security_bsd, OID_AUTO, suser_enabled, CTLFLAG_RW,
SYSCTL_INT(_security_bsd, OID_AUTO, suser_enabled, CTLFLAG_RW,
&suser_enabled, 0, "processes with uid 0 have privilege");
TUNABLE_INT("kern.security.bsd.suser_enabled", &suser_enabled);
TUNABLE_INT("security.bsd.suser_enabled", &suser_enabled);
/*
* Test whether the specified credentials imply "super-user" privilege.
@ -1312,7 +1311,7 @@ securelevel_ge(struct ucred *cr, int level)
* XXX: data declarations should be together near the beginning of the file.
*/
static int see_other_uids = 1;
SYSCTL_INT(_kern_security_bsd, OID_AUTO, see_other_uids, CTLFLAG_RW,
SYSCTL_INT(_security_bsd, OID_AUTO, see_other_uids, CTLFLAG_RW,
&see_other_uids, 0,
"Unprivileged processes may see subjects/objects with different real uid");
@ -1491,7 +1490,7 @@ p_cansched(struct proc *p1, struct proc *p2)
* XXX: data declarations should be together near the beginning of the file.
*/
static int unprivileged_proc_debug = 1;
SYSCTL_INT(_kern_security_bsd, OID_AUTO, unprivileged_proc_debug, CTLFLAG_RW,
SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_proc_debug, CTLFLAG_RW,
&unprivileged_proc_debug, 0,
"Unprivileged processes may use process debugging facilities");

4
sys/kern/subr_prf.c
View File

@ -819,10 +819,10 @@ msgbufinit(void *ptr, size_t size)
oldp = msgbufp;
}
SYSCTL_DECL(_kern_security_bsd);
SYSCTL_DECL(_security_bsd);
static int unprivileged_read_msgbuf = 1;
SYSCTL_INT(_kern_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
"Unprivileged processes may read the kernel message buffer");

12
usr.sbin/jail/jail.8
View File

@ -233,7 +233,7 @@ script from within the jail.
.Pp
NOTE: If you plan to allow untrusted users to have root access inside the
jail, you may wish to consider setting the
.Va kern.security.jail.set_hostname_allowed
.Va security.jail.set_hostname_allowed
to 0.
Please see the management reasons why this is a good idea.
If you do decide to set this variable,
@ -311,14 +311,14 @@ default, modified from within the jail, so the
status entry is unreliable by default.
To disable the setting of the hostname
from within a jail, set the
.Va kern.security.jail.set_hostname_allowed
.Va security.jail.set_hostname_allowed
sysctl variable in the host environment to 0, which will affect all jails.
You can have this sysctl set on each boot using
.Xr sysctl.conf 5 .
Just add the following line to
.Pa /etc/sysctl.conf :
.Pp
.Dl kern.security.jail.set_hostname_allowed=0
.Dl security.jail.set_hostname_allowed=0
.Pp
In a future version of
.Fx ,
@ -332,7 +332,7 @@ MIB variables.
Currently, these variables affect all jails on the system, although in
the future this functionality may be finer grained.
.Bl -tag -width XXX
.It Va kern.security.jail.set_hostname_allowed
.It Va security.jail.set_hostname_allowed
This MIB entry determines whether or not processes within a jail are
allowed to change their hostname via
.Xr hostname 1
@ -344,7 +344,7 @@ information in
.Pa /proc .
As such, this should be disabled in environments where privileged access to
jails is given out to untrusted parties.
.It Va kern.security.jail.socket_unixiproute_only
.It Va security.jail.socket_unixiproute_only
The jail functionality binds an IPv4 address to each jail, and limits
access to other network addresses in the IPv4 space that may be available
in the host environment.
@ -361,7 +361,7 @@ domain sockets,
IPv4 addresses, and routing sockets.
To enable access to other domains, this MIB variable may be set to
0.
.It Va kern.security.jail.sysvipc_allowed
.It Va security.jail.sysvipc_allowed
This MIB entry determines whether or not processes within a jail have access
to System V IPC primitives.
In the current jail implementation, System V primitives share a single