Date: Tue, 20 Apr 2004 01:56:38 +0000 From: "Christian S.J. Peron" <maneo@bsdpro.com> To: freebsd-hackers@FreeBSD.org Cc: freebsd-security@FreeBSD.org Subject: [patch] Raw sockets in jails Message-ID: <20040420015638.A84821@staff.seccuris.com>
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Although RAW sockets can be used when specifying the source
address of packets (defeating one of the aspects of the jail)
some people may find it usefull to use utilities like ping(8)
or traceroute(8) from inside jails.
Enclosed is a patch I have written which gives you the option
of allowing prison-root to create raw sockets inside the prison,
so that programs various network debugging programs like ping
and traceroute etc can be used.
This patch will create the security.jail.allow_raw_sockets sysctl
MIB. I would appriciate any feed-back from testers
See PR #:
http://www.freebsd.org/cgi/query-pr.cgi?pr=65800
-------------------- SNIP SNIP ------------------------
--- sys/kern/kern_jail.c.bak Mon Apr 19 16:55:40 2004
+++ sys/kern/kern_jail.c Mon Apr 19 17:56:03 2004
@@ -53,6 +53,11 @@
&jail_sysvipc_allowed, 0,
"Processes in jail can use System V IPC primitives");
+int jail_allow_raw_sockets = 0;
+SYSCTL_INT(_security_jail, OID_AUTO, allow_raw_sockets, CTLFLAG_RW,
+ &jail_allow_raw_sockets, 0,
+ "Prison root can create raw sockets");
+
/* allprison, lastprid, and prisoncount are protected by allprison_mtx. */
struct prisonlist allprison;
struct mtx allprison_mtx;
--- sys/netinet/raw_ip.c.b Mon Apr 19 16:23:57 2004
+++ sys/netinet/raw_ip.c Mon Apr 19 17:55:08 2004
@@ -40,6 +40,7 @@
#include "opt_random_ip_id.h"
#include <sys/param.h>
+#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mac.h>
@@ -505,6 +506,7 @@
}
}
+extern int jail_allow_raw_sockets;
u_long rip_sendspace = RIPSNDQ;
u_long rip_recvspace = RIPRCVQ;
@@ -527,7 +529,11 @@
INP_INFO_WUNLOCK(&ripcbinfo);
return EINVAL;
}
- if (td && (error = suser(td)) != 0) {
+ if (td && jailed(td->td_ucred) && !jail_allow_raw_sockets) {
+ INP_INFO_WUNLOCK(&ripcbinfo);
+ return (EPERM);
+ }
+ if (td && (error = suser_cred(td->td_ucred, PRISON_ROOT)) != 0) {
INP_INFO_WUNLOCK(&ripcbinfo);
return error;
}
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