lkml.org 
[lkml]   [2007]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH] Version 7 (2.6.23) Smack: Simplified Mandatory Access Control Kernel
    From
    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@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-10-15 01:17    [W:0.068 / U:1.816 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site