| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20071014231358.GA5565@Ahmed> Date: Mon, 15 Oct 2007 01:13:58 +0200 From: "Ahmed S. Darwish" <darwish.07@...il.com> To: Casey Schaufler <casey@...aufler-ca.com> Cc: torvalds@...l.org, akpm@...l.org, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Version 7 (2.6.23) Smack: Simplified Mandatory Access Control Kernel Hi Casey, On Sun, Oct 14, 2007 at 10:15:42AM -0700, Casey Schaufler wrote: > > + > +CIPSO Configuration > + > +It is normally unnecessary to specify the CIPSO configuration. The default > +values used by the system handle all internal cases. Smack will compose CIPSO > +label values to match the Smack labels being used without administrative > +intervention. > I have two issues with CIPSO and Smack: 1- Using default configuration (system startup script + smacfs fstab line), system can't access any service outside the Lan. "ICMP parameter problem message" always appear from the first Wan router (traceroute + tcpdump at [1]). Services inside the LAN can be accessed normally. System can connect to a Lan Windows share. It also connects to the gateway HTTP server easily. After some tweaking, I discovered that using CIPSOv6 solves all above problems: $ echo -n "NLBL_CIPSOv6" > /smack/nltype Is this a normal behaviour ? 2- > 4. Any access requested on an object labeled "*" is permitted. [...] > +Unlabeled packets that come into the system will be given the > +ambient label. Default conf let the ambient attribute = _ which works fine. Setting ambient = * stops all external (non lo) network traffic. Did I miss another use of "ambient" or this is a normal behaviour ?. > +Administration > + > +Smack supports some mount options: > + > + smackfsdef=label: specifies the label to give files that lack > + the Smack label extended attribute. > + Although using smackfsdef=* as a mount option, all my system files have the floor attribute. Most of the /dev files have the * attribute though. [1] traceroute to google.com (64.233.187.99), 30 hops max, 40 byte packets 1 host-196.218.207.17.tedata.net (196.218.207.17) 1.976 ms 1.850 ms 2.127 ms 2 DOKKI-R03C-GZ-EG (163.121.170.78) 27.429 ms 28.091 ms 23.336 ms Here's the tcpdump for accessing google.com: 22:51:26.008883 IP host-196.218.207.18.tedata.net.54011 > host-196.218.207.17.tedata.net.domain: 11001+ A? google.com. (28) 22:51:26.011066 IP host-196.218.207.18.tedata.net.45317 > host-196.218.207.17.tedata.net.domain: 44913+[|domain] 22:51:26.052154 IP host-196.218.207.17.tedata.net.domain > host-196.218.207.18.tedata.net.54011: 11001 3/0/0 A py-in-f99.google.com,[|domain] 22:51:26.052700 IP host-196.218.207.18.tedata.net.57180 > py-in-f99.google.com.www: S 282373541:282373541(0) win 5840 <mss 1460,sackOK,timestamp 741383 0,nop,wscale 5> 22:51:26.090608 IP host-196.218.207.17.tedata.net.domain > host-196.218.207.18.tedata.net.45317: 44913 1/0/0 (89) 22:51:26.091473 IP host-196.218.207.18.tedata.net.34417 > host-196.218.207.17.tedata.net.domain: 49202+[|domain] --> 22:51:26.105443 IP DOKKI-R03C-GZ-EG > host-196.218.207.18.tedata.net: ICMP parameter problem - octet 20, length 48 Best Regards, -- Ahmed S. Darwish HomePage: http://darwish.07.googlepages.com Blog: http://darwish-07.blogspot.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists