June 2008 - selinux - Fedora mailing-lists

Memory protection and system-config-securitylevel
by Kamil J. Dudek 28 Sep '09

28 Sep '09

Hello everybody Forgive me, if this subject has already been mentioned here, but I simply couldn't find answer anywhere. Few days ago I started system-config-securitylevel. I found something interesting in "Modify SELinux policies". A memory protection - there are four options in there. Two of them are enabled, with a description that if having this enabled is required by some program, it should be reported to bugzilla. I didn't do it, because of very strange effects after turning it off. Disabling "Allow all executable files to map memory areas as executable and readable, which is dangerous and such program should be reported to bugzilla" and "Allow all executable files to mark stack as executable.That shouldn't ever be required" option(translation from polish) made system act very strange. First thing I've observed was that Kobo game stopped working. GMPC stopped playing. Also stuff outside of Fedora like Java and NVidia drivers failed. So I should have "reported to bugzilla" to many application to make it have any sense. Such bug report would be only annoying but according to system-config-securitylevel... What is it with these two options? To make everything work properly they should be enabled, but their description that they should be disabled is confusing. Thank you and forgive me any mess I've done by this post -- Pozdrawiam - Kamil J. Dudek

2 3

mount point labels
by Clarkson, Mike R (US SSA) 14 Sep '09

14 Sep '09

I'm attempting to create the labeled mount point with the following command: mount -t nfs -o context=system_u:object_r:import_file_t:s0 nas:/vol/home /home/SimulatedImport/output/home The mount point is created without any errors, but the label that I specify in the mount command is not used. Instead of system_u:object_r:import_file_t, the context of the /home/SimulatedImport/output/home is system_u:object_r:nfs_t:s0. ls -dZ /home/SimulatedImport/output/home drwxr-xr-x root root system_u:object_r:nfs_t:s0 /home/m252/SimulatedImport/output/home I'm running RHEL5 with a policy built as mls off of the targeted policy. Does anyone know why the context label is not taking? Thanks

3 7

rsyncd can't open log file, but there are no avc messages
by Johnny Tan 09 Jul '08

09 Jul '08

I'm stumped. I run a Java app called Solr, which does search indexing. My solr server creates the index, then I have a bunch of solr clients that rsync that index over. The rsync itself is fine, that works. The problem is it won't write to the appropriate logfile, which is: /opt/solr/logs/rsyncd.log /opt/solr/logs is a symlink to /var/log/store. Here's how it looks: == [root@solr:~]# ls -l /opt/solr/ lrwxrwxrwx 1 tomcat tomcat 14 Apr 29 13:52 logs -> /var/log/store [root@solr:~]# ls -ldZ /opt/solr/logs/ drwxr-xr-x tomcat tomcat user_u:object_r:var_log_t /opt/solr/logs/ [root@solr:~]# ls -ldZ /var/log/store drwxr-xr-x tomcat tomcat user_u:object_r:var_log_t /var/log/store [root@solr:~]# ls -Z /opt/solr/logs/rsyncd.log -rw-rw-rw- tomcat tomcat user_u:object_r:var_log_t /var/log/store/rsyncd.log == Note that the mode is 666 on the rsyncd.log. When a client tries to connect, though, I get, in /var/log/messages: Jun 24 10:15:02 solr rsyncd[19355]: rsync: failed to open log-file /opt/solr/logs/rsyncd.log: Permission denied (13) But there are no avc denials (no, I don't have audit package installed, so all avc messages go to /var/log/messages -- I do get avc denials for other things). So, at first, I didn't think it was selinux-related, and tried to troubleshoot general unix permissions. But got nowhere. Then I noticed... when I put selinux in permissive mode, it works -- rsyncd properly logs to the above file. When I set it back to enforcing, I get the above error in /var/log/messages and nothing in the rsyncd.log, but no avc denials either. Any ideas? If it helps, here's how my rsyncd module looks like: == module solrrsync 1.0; require { type initrc_tmp_t; type port_t; type var_log_t; type restorecon_t; type rsync_t; type usr_t; class netlink_route_socket { read create bind getattr write nlmsg_read }; class lnk_file read; class file { read write getattr create append }; class tcp_socket { name_connect name_bind }; class dir { write add_name }; } #============= restorecon_t ============== allow restorecon_t initrc_tmp_t:file { read write }; allow restorecon_t usr_t:lnk_file read; allow restorecon_t var_log_t:lnk_file read; #============= rsync_t ============== allow rsync_t initrc_tmp_t:file { read write }; allow rsync_t port_t:tcp_socket { name_connect name_bind }; allow rsync_t self:netlink_route_socket { read create bind getattr write nlmsg_read }; allow rsync_t usr_t:lnk_file read; allow rsync_t usr_t:file { read getattr }; allow rsync_t var_log_t:lnk_file read; allow rsync_t var_log_t:dir { write add_name }; allow rsync_t var_log_t:file { read write getattr create append };

6 16

Creating a custom user role
by Jonathan Stott 03 Jul '08

03 Jul '08

Hi I'm on FC9, and I would like to create a user based on guest_u who is almost as unprivileged as that role, but is allowed to ssh out. So I opened up the polgengui tool kit and selected 'minimal terminal user role' I then also allowed it access to the guest role as an additional role. (I'm not sure if this step is required) I then allowed the role to connect to port 22 And then made the policy files. On running the script, I got the message '/usr/sbin/semanage: You must specify a prefix', which lead me to look a little closer at the generated file. One thing I noticed was that amongst the roles to be assigned to the new role was 'system_r', which I believe is the system administration role, so removing that and adding a prefix of user, I could then run the script and install the role. Adding it as the role for the user I want to allow ssh access out to, I then tried to login, which got me the message Unable to get valid context for username Setting the user to guest_u or user_u works fine, though. What did I do wrong? Regards, Jonathan.

2 1

xinetd rsync --daemon problems
by Chuck Anderson 03 Jul '08

03 Jul '08

I'm using Fedora Core 6, and trying to start a rsync daemon via xinetd. The default configuration is: # default: off # description: The rsync server is a good addition to an ftp server, as it \ # allows crc checksumming etc. service rsync { disable = no socket_type = stream wait = no user = root server = /usr/bin/rsync server_args = --daemon log_on_failure += USERID } With this rsyncd.conf: motd file = /etc/rsyncd.motd pid file = /var/run/rsyncd.pid port = 873 uid = rsyncd gid = mirror use chroot = yes max connections = 10 log file = /var/log/rsyncd.log read only = yes hosts allow = 127.0.0.1, ::1, etc.... #hosts deny = 0.0.0.0/0, :: ignore nonreadable = yes transfer logging = yes timeout = 600 dont compress = * [fedora-linux-core] path = /srv/ftp/pub/fedora/linux/core comment = Fedora Linux Core [fedora-linux-core-updates] path = /srv/ftp/pub/fedora/linux/core/updates comment = Fedora Linux Core Updates [fedora-linux-extras] path = /srv/ftp/pub/fedora/linux/extras comment = Fedora Linux Extras [fedora-linux-core-test] path = /srv/ftp/pub/fedora/linux/core/test comment = Fedora Linux Core Test [fedora-linux-releases] path = /srv/ftp/pub/fedora/linux/releases comment = Fedora Linux Releases [fedora-linux-development] path = /srv/ftp/pub/fedora/linux/development comment = Fedora Linux Development [fedora-enchilada] path = /srv/ftp/pub/fedora comment = Fedora - The whole enchilada [fedora-linux-updates] path = /srv/ftp/pub/fedora/linux/updates comment = Fedora Linux Updates [fedora-web] path = /srv/ftp/pub/fedora/web comment = Web content for Fedora Linux mirrors I get these AVCs when running from xinetd and making a client connection that I don't get if I start the daemon directly via "rsync --daemon" as root: type=AVC msg=audit(1192132336.713:3464): avc: denied { lock } for pid=8488 comm="rsync" name="rsyncd.lock" dev=dm-4 ino=2064435 scontext=user_u:system_r:rsync_t:s0 tcontext=root:object_r:var_run_t:s0 tclass=file type=SYSCALL msg=audit(1192132336.713:3464): arch=40000003 syscall=221 success=no exit=-13 a0=4 a1=d a2=bff80730 a3=bff80730 items=0 ppid=8167 pid=8488 auid=10002 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="rsync" exe="/usr/bin/rsync" subj=user_u:system_r:rsync_t:s0 key=(null) type=AVC_PATH msg=audit(1192132336.713:3464): path="/var/run/rsyncd.lock" type=AVC msg=audit(1192132400.044:3465): avc: denied { bind } for pid=8499 comm="rsync" scontext=user_u:system_r:rsync_t:s0 tcontext=user_u:system_r:rsync_t:s0 tclass=netlink_route_socket type=SYSCALL msg=audit(1192132400.044:3465): arch=40000003 syscall=102 success=no exit=-13 a0=2 a1=bf8f4674 a2=4df50ff4 a3=3 items=0 ppid=8167 pid=8499 auid=10002 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="rsync" exe="/usr/bin/rsync" subj=user_u:system_r:rsync_t:s0 key=(null) I tried creating and loading a policy module: # grep "rsync" /var/log/audit/audit.log | audit2allow -M rsyncd # semodule -i rsyncd.pp Here is rsyncd.te: module rsyncd 1.0; require { type var_run_t; type rsync_t; class netlink_route_socket create; class file { read write }; } #============= rsync_t ============== allow rsync_t self:netlink_route_socket create; allow rsync_t var_run_t:file { read write }; But I still get these AVCs: type=AVC msg=audit(1192139751.238:3586): avc: denied { bind } for pid=9311 comm="rsync" scontext=user_u:system_r:rsync_t:s0 tcontext=user_u:system_r:rsync_t:s0 tclass=netlink_route_socket type=SYSCALL msg=audit(1192139751.238:3586): arch=40000003 syscall=102 success=no exit=-13 a0=2 a1=bfbb6144 a2=4df50ff4 a3=3 items=0 ppid=8732 pid=9311 auid=10002 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="rsync" exe="/usr/bin/rsync" subj=user_u:system_r:rsync_t:s0 key=(null) Additionally, when using xinetd I don't ever get any log messages in /var/log/rsyncd.log like I do when I run "rsync --daemon" directly: 2007/10/11 17:08:01 [8613] rsyncd version 2.6.9 starting, listening on port 873 2007/10/11 17:08:13 [8616] connect from dustpuppy.wpi.edu (2001:468:616:8c9:213:72ff:fe74:da15) 2007/10/11 17:08:13 [8616] rsync on fedora-enchilada/linux/ from dustpuppy.wpi.edu (2001:468:616:8c9:213:72ff:fe74:da15) 2007/10/11 21:08:13 [8616] building file list 2007/10/11 21:08:13 [8616] sent 1629 bytes received 106 bytes total size 19

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Fedora 9 SELinux is preventing sendmail (exim_t) "getattr" to pipe (system_crond_t)
by Frank Murphy 30 Jun '08

30 Jun '08

I think this has to do with exim trying to send logs? Should I actually bug-report? or just use the audit2allow -M local < /tmp/avcs Frank Summary: SELinux is preventing sendmail (exim_t) "getattr" to pipe (system_crond_t). Detailed Description: SELinux denied access requested by sendmail. It is not expected that this access is required by sendmail and this access may signal an intrusion attempt. It is also possible that the specific version or configuration of the application is causing it to require additional access. Allowing Access: You can generate a local policy module to allow this access - see FAQ (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable SELinux protection altogether. Disabling SELinux protection is not recommended. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Additional Information: Source Context system_u:system_r:exim_t:s0 Target Context system_u:system_r:system_crond_t:s0 Target Objects pipe [ fifo_file ] Source sendmail Source Path /usr/sbin/exim Port <Unknown> Host frank-01 Source RPM Packages exim-4.69-4.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.1-69.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name frank-01 Platform Linux frank-01 2.6.25.6-55.fc9.i686 #1 SMP Tue Jun 10 16:27:49 EDT 2008 i686 i686 Alert Count 3 First Seen Sat 28 Jun 2008 11:01:27 IST Last Seen Sat 28 Jun 2008 11:01:27 IST Local ID 675df78e-7627-418a-8d0b-2f9943cd7033 Line Numbers Raw Audit Messages host=frank-01 type=AVC msg=audit(1214647287.324:61): avc: denied { getattr } for pid=16267 comm="sendmail" path="pipe:[94447]" dev=pipefs ino=94447 scontext=system_u:system_r:exim_t:s0 tcontext=system_u:system_r:system_crond_t:s0 tclass=fifo_file host=frank-01 type=SYSCALL msg=audit(1214647287.324:61): arch=40000003 syscall=197 success=no exit=-13 a0=1 a1=bf812f64 a2=981ff4 a3=b805d84c items=0 ppid=1 pid=16267 auid=4294967295 uid=93 gid=93 euid=93 suid=93 fsuid=93 egid=93 sgid=93 fsgid=93 tty=(none) ses=4294967295 comm="sendmail" exe="/usr/sbin/exim" subj=system_u:system_r:exim_t:s0 key=(null)

2 1

rsyncd and pre-xfer/post-xfer exec problem with FC8 selinux
by Przemysław Sztoch 29 Jun '08

29 Jun '08

Running fully updated Fedora 8, trying to upload somefiles via rsync, and getting a couple of denials (on server with xinetd&rsyncd): avc: denied { read } for pid=20530 comm="rsync" name="sh" dev=dm-0 ino=1507433 scontext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=lnk_file avc: denied { execute } for pid=20530 comm="rsync" name="bash" dev=dm-0 ino=1507343 sc ontext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=system_u:object_r:shell_exec_t:s0 tclass=file avc: denied { read } for pid=20530 comm="rsync" name="bash" dev=dm-0 ino=1507343 scont ext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=system_u:object_r:shell_exec_t:s0 tclass=file avc: denied { execute_no_trans } for pid=20530 comm="rsync" path="/bin/bash" dev=dm-0 ino=1507343 scontext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=system_u:object_r:shell_exec_t:s0 tclass=file avc: denied { getattr } for pid=20530 comm="sh" path="/bin/bash" dev=dm-0 ino=1507343 scontext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=system_u:object_r:shell_exec_t:s0 tclass=file My rsyncd.conf: use chroot = yes max connections = 50 log file = /var/log/rsync.log uid = autobackup gid = users [autobackup] path = /opt/autobackup read only = no write only = yes list = no uid = autobackup incoming chmod = u=rw,go-rwx transfer logging = yes pre-xfer exec = /usr/local/bin/autobackup-hook pre post-xfer exec = /usr/local/bin/autobackup-hook post What should I do to use pre/post scripts in rsync? -- View this message in context: http://www.nabble.com/rsyncd-and-pre-xfer-post-xfer-exec-problem-with-FC8-s… Sent from the Fedora SELinux List mailing list archive at Nabble.com.

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segatex-6.50 released
by Shintaro Fujiwara 29 Jun '08

29 Jun '08

Hi, guys. I released segatex-6.50. ################################################## In this version... It pops up Widget when denied message happens. ################################################## It can do anything you need when you configure SELinux thing. Enjoy. http://sourceforge.net/projects/segatex/ -- http://intrajp.no-ip.com/ Home Page

1 0

audit2allow failure in rawhide
by Joe Nall 29 Jun '08

29 Jun '08

While playing with rawhide/mls/permissive+Ted Toth's wm policy: [root@xtest log]# audit2allow </var/log/Xorg.0.log Traceback (most recent call last): File "/usr/bin/audit2allow", line 344, in <module> app.main() File "/usr/bin/audit2allow", line 338, in main self.__output() File "/usr/bin/audit2allow", line 314, in __output g.add_role_types(self.__role_types) AttributeError: PolicyGenerator instance has no attribute 'add_role_types'

3 2

KVM image problems
by Adam Huffman 25 Jun '08

25 Jun '08

Having applied Dan Walsh's suggested fix for a SpamAssassin problem, I'm now seeing errors when running a virtual machine via KVM. The image was created in virt-install quite a while ago: -rwxr-xr-x root root system_u:object_r:xen_image_t XP1 However, after changing to enforcing mode I saw lots of these errors: > > Summary: > > SELinux is preventing qemu-kvm (qemu_t) "write" to /var/lib/xen/images/XP1 > (xen_image_t). > > Detailed Description: > > SELinux denied access requested by qemu-kvm. It is not expected that > this access > is required by qemu-kvm and this access may signal an intrusion > attempt. It is > also possible that the specific version or configuration of the > application is > causing it to require additional access. > > Allowing Access: > > Sometimes labeling problems can cause SELinux denials. You could try > to restore > the default system file context for /var/lib/xen/images/XP1, > > restorecon -v '/var/lib/xen/images/XP1' > > If this does not work, there is currently no automatic way to allow > this access. > Instead, you can generate a local policy module to allow this access - > see FAQ > (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can > disable > SELinux protection altogether. Disabling SELinux protection is not > recommended. > Please file a bug report > (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) > against this package. > > Additional Information: > > Source Context system_u:system_r:qemu_t > Target Context user_u:object_r:xen_image_t > Target Objects /var/lib/xen/images/XP1 [ file ] > Source qemu-kvm > Source Path /usr/bin/qemu-kvm > Port <Unknown> > Host saintloup.smith.man.ac.uk > Source RPM Packages kvm-65-7.fc9 > Target RPM Packages > Policy RPM selinux-policy-3.3.1-64.fc9 > Selinux Enabled True > Policy Type targeted > MLS Enabled True > Enforcing Mode Enforcing > Plugin Name catchall_file > Host Name saintloup.smith.man.ac.uk > Platform Linux saintloup.smith.man.ac.uk > 2.6.25.6-55.fc9.x86_64 #1 SMP Tue Jun 10 > 16:05:21 > EDT 2008 x86_64 x86_64 > Alert Count 105 > First Seen Tue 24 Jun 2008 11:14:08 BST > Last Seen Tue 24 Jun 2008 11:15:23 BST > Local ID ae1ef75a-23f4-495d-af20-604d56fa2cde > Line Numbers > > Raw Audit Messages > > host=saintloup.smith.man.ac.uk type=AVC > msg=audit(1214302523.807:45871): avc: denied { write } for pid=6827 > comm="qemu-kvm" path="/var/lib/xen/images/XP1" dev=dm-6 ino=2621983 > scontext=system_u:system_r:qemu_t:s0 > tcontext=user_u:object_r:xen_image_t:s0 tclass=file > > host=saintloup.smith.man.ac.uk type=SYSCALL > msg=audit(1214302523.807:45871): arch=c000003e syscall=1 success=no > exit=-13 a0=5 a1=364ea00 a2=200 a3=1 items=0 ppid=3284 pid=6827 > auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 > fsgid=0 tty=(none) ses=4294967295 comm="qemu-kvm" > exe="/usr/bin/qemu-kvm" subj=system_u:system_r:qemu_t:s0 key=(null) > > I received a permission denied error when I tried manually to change the file to system_u:system_r:qemu_t and restorecon -v doesn't seem to do anything. Adam

3 3

unpriv user domain <--> SE-PostgreSQL
by KaiGai Kohei 24 Jun '08

24 Jun '08

Dan, At the selinux-policy-3.4.2, you pulled the latest upstreamed refpolicy which contains a set of SE-PostgreSQL policies, but it neglected to merge an interface invocation at userdom_unpriv_user_template(), as follows: optional_policy(` postgresql_userdom_template($1,$1_t,$1_r) ') It prevents user_t, staff_t, ... to access SE-PostgreSQL. Could you update it? Thanks, -- OSS Platform Development Division, NEC KaiGai Kohei <kaigai(a)ak.jp.nec.com>

1 0

simple question with home serviing ruby on rails web site
by Craig White 23 Jun '08

23 Jun '08

I'm running in permissive mode so all I'm getting is warnings but I'm wondering the best way to solve this... error every time httpd starts... SELinux has denied httpd access to potentially mislabeled file(s) (./svn-new). This means that SELinux will not allow httpd to use these files. It is common for users to edit files in their home directory or tmp directories and then move (mv) them to system directories. The problem is that the files end up with the wrong file context which confined applications are not allowed to access. Allowing AccessIf you want httpd to access this files, you need to relabel them using restorecon -v './svn-new'. You might want to relabel the entire directory using restorecon -R -v './svn-new'. Additional InformationSource Context: system_u:system_r:httpd_t:SystemLow-SystemHighTarget Context: user_u:object_r:user_home_tTarget Objects: ./svn-new [ dir ]Source: httpdSource Path: /usr/sbin/httpd /home/craig/svn-new is an svn checkout and is the 'RAILS ROOT' directory for the web server. $ ls -ldZ /home/craig/svn-new/ drwxrwxr-x craig craig user_u:object_r:user_home_t /home/craig/svn-new/ This is on Fedora 9. In the past, I could have used system-config-security and set selinux to allow web page serving from user home directories but I don't see that tool any more. What's the best way to handle this? Craig

3 8

chcon in %post
by Jason L Tibbitts III 23 Jun '08

23 Jun '08

I just came across a package that does this: %post /usr/bin/chcon -t unconfined_execmem_exec_t %{_libexecdir}/haddock.bin >/dev/null 2>&1 || : rpmlint complains bitterly about it, and honestly I'm really not sure what's supposed to happen here. This is a ghc-compiled binary. (ghc is a Haskell compiler.) So, if you have a binary in a package that really needs this context, is running chcon in %post the right way to do it? - J<

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polyinstation and removable media
by Stefan Schulze Frielinghaus 23 Jun '08

23 Jun '08

Something strange happens when /tmp and /var/tmp are polyinstantiated for all of my users except root and adm. /etc/security/namespace.conf: /tmp tmpfs tmpfs root,adm /var/tmp tmpfs tmpfs root,adm When the user logs into a GDM session using GNOME and plugs in a USB-Stick, DVD or whatever the device is _not_ mounted. Everything else works fine. The directory in /media is created and everything is setup correctly but the final mount command is not issued. The logfiles don't speak that much but maybe this is a little hint. Jun 21 19:20:19 test kernel: sd 0:0:0:0: [sda] Attached SCSI removable disk Jun 21 19:20:19 test console-kit-daemon[1629]: WARNING: Couldn't read /proc/2766/environ: Error reading file '/proc/2766/environ': No such process Jun 21 19:20:20 test hald: mounted /dev/sda1 on behalf of uid 500 Jun 21 19:20:20 test gnome-keyring-daemon[2647]: adding removable location: volume_uuid_47DB_BAD8 at /media/blub And here is a logfile without polyinstantiation: Jun 21 19:25:00 test kernel: sd 1:0:0:0: [sda] Attached SCSI removable disk Jun 21 19:25:00 test kernel: sd 1:0:0:0: Attached scsi generic sg0 type 0 Jun 21 19:25:01 test gnome-keyring-daemon[3746]: adding removable location: volume_uuid_47DB_BAD8 at /media/blub Jun 21 19:25:01 test hald: mounted /dev/sda1 on behalf of uid 500 Both logs say that the media was mounted but that's not true if polyinstantiated. Maybe something related to the console-kit-daemon warning message? Does someone has an idea or can confirm this? Best regards Stefan

2 1

What to do about "invalid context"
by Göran Uddeborg 17 Jun '08

17 Jun '08

Could anyone explain what is wrong when I get the error below? The problem: I get error messages when I try to run crontab. mimmi> env LANG=en_US.utf8 crontab -l Authentication service cannot retrieve authentication info You (göran) are not allowed to access to (crontab) because of pam configuration. What I have found out: In the audit log there is this entry: mimmi> sudo ausearch -a 3208 ---- time->Sat Jun 14 11:17:09 2008 type=SYSCALL msg=audit(1213435029.953:3208): arch=c000003e syscall=59 success=no exit=-13 a0=7f7c49c10238 a1=7fff57b9d760 a2=7f7c49e11f50 a3=7f7c4f562a70 items=0 ppid=5234 pid=5236 auid=503 uid=0 gid=503 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=16 comm="crontab" exe="/usr/bin/crontab" subj=unconfined_u:unconfined_r:unconfined_crontab_t:s0-s0:c0.c1023 key=(null) type=SELINUX_ERR msg=audit(1213435029.953:3208): security_compute_sid: invalid context unconfined_u:unconfined_r:updpwd_t:s0-s0:c0.c1023 for scontext=unconfined_u:unconfined_r:unconfined_crontab_t:s0-s0:c0.c1023 tcontext=system_u:object_r:updpwd_exec_t:s0 tclass=process Using strace I see that crontab tries to exec /sbin/unix_update and fails, which I suppose is what this message is about: 4826 execve("/sbin/unix_update", ["/sbin/unix_update", "g\303\266ran", "verify"], [/* 0 vars */]) = -1 EACCES (Permission denied) My first though was that maybe the label on unix_update had not been correctly updated in some upgrade or so. But doing a restorecon on it didn't change its context (system_u:object_r:updpwd_exec_t:s0). I assume there is something broken in the host configurations, rather than some bug in the policy. But I don't understand what it is or what to do about it. I'm usually able to figure out "type=AVC"/"avc: denied" issues, but what do I do about a "type=SELINUX_ERR"/"invalid context"?

2 3

What is the proper context for .strigi?
by Dan Thurman 16 Jun '08

16 Jun '08

I have run into a problem of limted space for .strigi which was located in my home directory, so I decided to move ~/.strigi to another partition with ample space and created a symbolic link from ~/.strigi to the new location on a different partition. Selinux is reporting: SELinux is preventing strigidaemon (unconfined_t) "mmap_zero" to <Unknown> (unconfined_t). So, what is the proper context for .strigi and all of the files/directories contained within? Thanks! Dan

4 4

Fwd: [MLS Policy]:- Problem for mapping between the Linux user to SELinux user for fedora 8
by prakash hallalli 16 Jun '08

16 Jun '08

Hi... Now I am trying to configuring RBAC using MLS (Multilevel Security) Policy for fedora 8. Because i have read danwalsh jornal he side MLS policy is more use full for RBAC. * http://danwalsh.livejournal.com/?skip=40 Using RBAC In FC5/MLS Policy* So i am using MLS policy for RBAC. Here i have installed MLS packages and changed to targeted policy in to mls policy. Then i have configured the roles for users but i couldn't set the roles because when i am setting the roles it will display the error message. Steps to reproduce: 1) Adding the SELinux audit user using semanage command. # semanage user -a -R staff_r -R auditadm_r -P staff audit_u 2) Here i am checking SELinux user. [root@turtle2 ~]# semanage user -l Labeling MLS/ MLS/ SELinux User Prefix MCS Level MCS Range SELinux Roles audit_u staff SystemLow SystemLow staff_r auditadm_r root sysadm SystemLow SystemLow:SystemLow-SystemHigh system_r sysadm_r staff_r secadm_r auditadm_r staff_u staff SystemLow SystemLow:SystemLow-SystemHigh sysadm_r staff_r secadm_r auditadm_r sysadm_u sysadm SystemLow SystemLow:SystemLow-SystemHigh sysadm_r system_u user SystemLow SystemLow:SystemLow-SystemHigh system_r user_u user SystemLow SystemLow system_r user_r [root@turtle2 ~]# 3) Now i am setting the Linux user to SELinux users, when i am setting the SELinux user it will throw the error message as follows. [root@turtle2 ~]# semanage login -a -s audit -r SystemLow-SystemHigh prakash libsemanage.validate_handler: selinux user audit does not exist No such file or directory. libsemanage.validate_handler: seuser mapping [prakash -> (audit, s0-s15:c0.c1023)] is invalid No such file or directory. libsemanage.dbase_llist_iterate: could not iterate over records No such file or directory. /usr/sbin/semanage: Could not add login mapping for prakash [root@turtle2 ~]# 4) I am using sysadm_r root information as follows [root@turtle2 ~]# id uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=root:sysadm_r:sysadm_t:SystemLow:SystemLow-SystemHigh [root@turtle2 ~]# 5) This is i am getting audit log messages using ausearch command. [root@turtle2 ~]# ausearch -i -m AVC -sv no type=SYSCALL msg=audit(06/02/2008 22:09:05.165:6877768) : arch=i386 syscall=read success=no exit=-13(Permission denied) a0=3 a1=9098808 a2=400 a3=400 items=0 ppid=1 pid=2060 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) comm=gam_server exe=/usr/libexec/gam_server subj=system_u:system_r:rpm_t:s0-s15:c0.c1023 key=(null) type=AVC msg=audit(06/02/2008 22:09:05.165:6877768) : avc: denied { read } for pid=2060 comm=gam_server path=inotify dev=inotifyfs ino=1 scontext=system_u:system_r:rpm_t:s0-s15:c0.c1023 tcontext=system_u:object_r:inotifyfs_t:s0 tclass=dir I don't know why its throwing this error. I have searched in to google but i couldn't find. Please help me what should i do. Thanks, Prakash

2 2

Re: f9 selinux complaint opening dvd reader .hal-mtab-lock
by Antonio Olivares 14 Jun '08

14 Jun '08

--- On Fri, 6/13/08, Skunk Worx <skunkworx(a)verizon.net> wrote: > From: Skunk Worx <skunkworx(a)verizon.net> > Subject: f9 selinux complaint opening dvd reader .hal-mtab-lock > To: "For users of Fedora Core releases" <fedora-list(a)redhat.com> > Date: Friday, June 13, 2008, 9:33 PM > When I open my DVD reader by pushing the button I get a > sheriff badge. > > Should I just apply the "Fix Command"? > --- > John > > Summary > SELinux prevented umount from mounting on the file or > directory > "/media/.hal-mtab-lock" (type "mnt_t"). > > Detailed Description > SELinux prevented umount from mounting a filesystem on the > file or > directory "/media/.hal-mtab-lock" of type > "mnt_t". By default SELinux > limits the mounting of filesystems to only some files or > directories > (those with types that have the mountpoint attribute). The > type "mnt_t" > does not have this attribute. You can either relabel the > file or > directory or set the boolean > "allow_mount_anyfile" to true to allow > mounting on any file or directory. > > Allowing Access > Changing the "allow_mount_anyfile" boolean to > true will allow this > access: "setsebool -P allow_mount_anyfile=1." > > Fix Command > setsebool -P allow_mount_anyfile=1 > > Additional Information > Source Context: system_u:system_r:mount_t:s0 > Target Context: system_u:object_r:mnt_t:s0 > Target Objects: /media/.hal-mtab-lock [ file ] > Source: umount > Source Path: /bin/umount > Port: <Unknown> > Host: localhost.localdomain > Source RPM Packages: util-linux-ng-2.13.1-6.fc9 > Target RPM Packages: > Policy RPM: selinux-policy-3.3.1-64.fc9 > Selinux Enabled: True > Policy Type: targeted > MLS Enabled: True > Enforcing Mode: Enforcing > Plugin Name: allow_mount_anyfile > Host Name: localhost.localdomain > Platform: Linux localhost.localdomain > 2.6.25.6-55.fc9.x86_64 #1 SMP Tue > Jun 10 16:05:21 EDT 2008 x86_64 x86_64 > Alert Count: 7 > First Seen: Sun 25 May 2008 01:45:46 AM PDT > Last Seen: Fri 13 Jun 2008 09:20:53 PM PDT > Local ID: eb563b96-3949-4532-8792-f239a145eef7 > Line Numbers: > > Raw Audit Messages : > host=localhost.localdomain type=AVC > msg=audit(1213417253.89:56): avc: > denied { read write } for pid=3267 comm="umount" > path="/media/.hal-mtab-lock" dev=dm-0 ino=4505604 > > scontext=system_u:system_r:mount_t:s0 > tcontext=system_u:object_r:mnt_t:s0 tclass=file > > host=localhost.localdomain type=SYSCALL > msg=audit(1213417253.89:56): > arch=c000003e syscall=59 success=yes exit=0 a0=403665 > a1=7fff5c756200 > a2=7fff5c756888 a3=0 items=0 ppid=3266 pid=3267 > auid=4294967295 uid=0 > gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 > tty=(none) > ses=4294967295 comm="umount" > exe="/bin/umount" > subj=system_u:system_r:mount_t:s0 key=(null) > > -- > fedora-list mailing list > fedora-list(a)redhat.com > To unsubscribe: > https://www.redhat.com/mailman/listinfo/fedora-list I get the same thing :( I applied the suggested fix, but still see the same CCD: fedora-selinux-list(a)redhat.com Summary: SELinux prevented umount from mounting on the file or directory "/media/.hal-mtab-lock" (type "mnt_t"). Detailed Description: SELinux prevented umount from mounting a filesystem on the file or directory "/media/.hal-mtab-lock" of type "mnt_t". By default SELinux limits the mounting of filesystems to only some files or directories (those with types that have the mountpoint attribute). The type "mnt_t" does not have this attribute. You can either relabel the file or directory or set the boolean "allow_mount_anyfile" to true to allow mounting on any file or directory. Allowing Access: Changing the "allow_mount_anyfile" boolean to true will allow this access: "setsebool -P allow_mount_anyfile=1." Fix Command: setsebool -P allow_mount_anyfile=1 Additional Information: Source Context system_u:system_r:mount_t:s0 Target Context system_u:object_r:mnt_t:s0 Target Objects /media/.hal-mtab-lock [ file ] Source umount Source Path /bin/umount Port <Unknown> Host localhost.localdomain Source RPM Packages util-linux-ng-2.13.1-6.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.1-51.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_mount_anyfile Host Name localhost.localdomain Platform Linux localhost.localdomain 2.6.25.6-55.fc9.x86_64 #1 SMP Tue Jun 10 16:05:21 EDT 2008 x86_64 x86_64 Alert Count 3 First Seen Wed 11 Jun 2008 09:10:49 PM CDT Last Seen Fri 13 Jun 2008 11:43:08 PM CDT Local ID 035edd4c-51d5-49fb-b01f-6468353b5b2d Line Numbers Raw Audit Messages host=localhost.localdomain type=AVC msg=audit(1213418588.58:32): avc: denied { write } for pid=3290 comm="umount" path="/media/.hal-mtab-lock" dev=dm-0 ino=1785859 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:mnt_t:s0 tclass=file host=localhost.localdomain type=SYSCALL msg=audit(1213418588.58:32): arch=c000003e syscall=59 success=yes exit=0 a0=403665 a1=7fffd7da1770 a2=7fffd7da1df8 a3=0 items=0 ppid=3289 pid=3290 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="umount" exe="/bin/umount" subj=system_u:system_r:mount_t:s0 key=(null) I manually ejected a data cd. Thanks, Antonio

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Fwd: [MLS Policy]:- MLS policy problem when manully restart the servers .
by prakash hallalli 13 Jun '08

13 Jun '08

Hi I have followed the same steps what you are given the information to change the libc.so.6 file label. Now user will be able to login to the system it not showing any error message while login time. But still i am not able do system restart services. Now it showing error message is unrecognized service. I have received the following error messages. [root@turtle11 ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: permissive Mode from config file: enforcing Policy version: 21 Policy from config file: mls [root@turtle11 ~]# service nfs restart Shutting down NFS mountd: [ OK ] Shutting down NFS daemon: [ OK ] Shutting down NFS quotas: [ OK ] Shutting down NFS services: [ OK ] Starting NFS services: [ OK ] Starting NFS quotas: [ OK ] Starting NFS daemon: [ OK ] Starting NFS mountd: [ OK ] [root@turtle11 ~]# setenforce 1 [root@turtle11 ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: enforcing Mode from config file: enforcing Policy version: 21 Policy from config file: mls [root@turtle11 ~]# service nfs restart nfs: unrecognized service [root@turtle11 ~]# service ldap restart ldap: unrecognized service [root@turtle11 ~]# service samba restart samba: unrecognized service [root@turtle11 ~]# service named restart named: unrecognized service [root@turtle11 ~]# Please help me, what should i do. Thanks, prakash On Tue, Jun 10, 2008 at 5:37 PM, Stephen Smalley <sds(a)tycho.nsa.gov> wrote: > > On Tue, 2008-06-10 at 17:14 +0530, prakash hallalli wrote: > > Hi All > > > > I have configured SELinux on ContOS 5.1. I have configured the RBAC > > using MLS (Multilevel Security) Policy. > > Now i am trying to restart the system services and they are not > > restarting and it is throwing some error message. > > I have a question here, with mls policy enabled will i be able to > > restart the system service? If yes then what to do and If no what is > > the reason? > > > > Steps to reproduce: > > > > 1) MLS Policy configuration. > > > > 1. Install selinux-policy-mls > > 2. Set SELINUXTYPE=MLS in /etc/selinux/config file > > 3. touch ./autorelabel; on root's home directory, and reboot the > > machine. > > 4. While machine is rebooting, change the GRUB parameter. > > enforcing=0 > > > > 2) Now system is in permissive mode and SELinux status is as follows. > > > > # sestatus > > SELinux status: enabled > > SELinuxfs mount: /selinux > > Current mode: permissive > > Mode from config file: enforcing > > Policy version: 21 > > policy from config file: mls > > > > 3) Restart the system services and they restart successfully. > > > > [root@turtle11 ~]# service nfs restart > > Shutting down NFS mountd: [FAILED] > > Shutting down NFS daemon: [FAILED] > > Shutting down NFS quotas: [FAILED] > > Shutting down NFS services: [FAILED] > > Starting NFS services: [ > > OK ] > > Starting NFS quotas: [ > > OK ] > > Starting NFS daemon: [ > > OK ] > > Starting NFS mountd: [ > > OK ] > > > > 4) Now i am setting enforcing mode using setenforce command. > > > > root@turtle11 ~]#setenforce 1 > > root@turtle11 ~]# sestatus > > SELinux status: enabled > > SELinuxfs mount: /selinux > > Current mode: enforcing > > Mode from config file: enforcing > > Policy version: 21 > > Policy from config file: mls > > > > 5) a) Now system is in enforcing mode and i am trying to restart the > > system service. The restart will result in error message. > > > > root@turtle11 ~]#service nfs restart > > /sbin/consoletype: error while loading shared libraries: libc.so.6: > > cannot open shared object file: No such file or directory > > /sbin/consoletype: error while loading shared libraries: libc.so.6: > > cannot open shared object file: No such file or directory > > This suggests that libc.so.6 has the wrong label. In older versions of > the policy, this was a difference between targeted and strict/mls > policies. Boot in single-user mode and run fixfiles -F relabel. > > > nfs: unrecognized service > > > > b) When I trying to login it will show the following error. > > > > turtle login: smbldap3 > > /bin/login:error while loading shared libraries: libcrypt.so.1:failed > > to map segment from shared object: Permission denied > > /sbin/mingetty: error while loading shared libraries: libc.so.6: > > failed to map segment from shared object: Permission denied > > > > c) When using su command. > > > > root@turtle11 ~]# su smbldap3 > > su: error while loading shared libraries: libpam.so.0: failed to map > > segment from shared object: Permission denied > > > > I am not sure what is going on. I referred to many websites and PDFs > > but couldn't get the proper solution. > > > > please help me. > > > > Thanks > > Prakash. > > > > > > -- > > fedora-selinux-list mailing list > > fedora-selinux-list(a)redhat.com > > https://www.redhat.com/mailman/listinfo/fedora-selinux-list > -- > Stephen Smalley > National Security Agency > >

2 1

F9: su and sudo don't work as user
by Chuck Anderson 13 Jun '08

13 Jun '08

Ok, I thought this was a known issue but I can't seem to find it mentioned anywhere. I have a F9 system that "su" and "sudo" don't work on. I noticed that my context was user_u rather than unconfined_u: Login on the console as cra: [cra@system 20:25:34 /home/cra]>id uid=10002(cra) gid=10002(cra) groups=1000(netops),2011(mirror),10002(cra) context=user_u:user_r:user_t:s0 [cra@system 20:25:36 /home/cra]>su /bin/su: Permission denied. [cra@system 20:25:37 /home/cra]>sudo sudo: setresuid(ROOT_UID, 1, ROOT_UID): Operation not permitted So I tried to go in as root and fix the context like this: Login on the console as root: [root@system ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: enforcing Mode from config file: enforcing Policy version: 22 Policy from config file: targeted [root@system ~]# setenforce 0 [root@system ~]# semanage login -l Login Name SELinux User MLS/MCS Range __default__ unconfined_u s0 root root s0-s0:c0.c1023 system_u system_u s0-s0:c0.c1023 [root@system ~]# semanage login -m -s unconfined_u root libsemanage.validate_handler: selinux user unconfined_u does not exist (No such file or directory). libsemanage.validate_handler: seuser mapping [root -> (unconfined_u, s0-s0:c0.c1023)] is invalid (No such file or directory). libsemanage.dbase_llist_iterate: could not iterate over records (No such file or directory). /usr/sbin/semanage: Could not modify login mapping for root [root@system ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: permissive Mode from config file: enforcing Policy version: 22 Policy from config file: targeted [root@system ~]# setenforce 1 [root@system ~]# exit But it didn't work as you can see. I'm running these versions: kernel-2.6.25.4-30.fc9.x86_64 selinux-policy-targeted-3.3.1-64.fc9.noarch Can someone please help? Thanks.

2 3

[Fwd: [Fedora8] SElinux bug]
by max 13 Jun '08

13 Jun '08

Found on fedora list. -------- Original Message -------- Subject: [Fedora8] SElinux bug Date: Thu, 12 Jun 2008 15:58:58 +0100 From: hicham <hichamlinux(a)gmail.com> Reply-To: For users of Fedora <fedora-list(a)redhat.com> To: For users of Fedora <fedora-list(a)redhat.com> Hello I had this morning a "freeze", where I could not shutdown X server or the laptop properly, looking at /var/log/messages: I found what I suspect a selinux bug : Jun 12 12:19:00 laptop kernel: SELinux: out of range capability -555425744 Jun 12 12:19:00 laptop kernel: ------------[ cut here ]------------ Jun 12 12:19:00 laptop kernel: kernel BUG at security/selinux/hooks.c:1332! Jun 12 12:19:00 laptop kernel: invalid opcode: 0000 [#1] SMP Jun 12 12:19:00 laptop kernel: Modules linked in: iptable_nat xt_limit xt_tcpudp iptable_mangle ipt_LOG ipt_MASQUERADE nf_nat xt_DSCP ipt_REJE CT nf_conntrack_irc nf_conntrack_ftp nf_conntrack_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables pppoatm pppoe pppox ppp_synctty ppp_async ppp_generic slhc appletalk ipx p8023 ipv6 cpufreq_ondemand acpi_cpufreq vfat fat dm_mirror dm_multipath dm_mod parport_pc smsc_ircc 2 parport irda crc_ccitt pcspkr floppy serio_raw snd_intel8x0 snd_seq_dummy snd_seq_oss video snd_seq_midi_event snd_seq output snd_seq_device snd_intel8x0m fglrx(P)(U) snd_ac97_codec snd_pcm_oss ac97_bus tg3 snd_mixer_oss snd_pcm wmi snd_timer battery snd ac soundcore snd_page_alloc button iTCO_wdt i2c_i801 i2c_core iTCO_vendor_support joydev speedtch usbatm sr_mod cdrom atm sg pata_acpi ata_generic ata_piix libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode] Jun 12 12:19:00 laptop kernel: Jun 12 12:19:00 laptop kernel: Pid: 2036, comm: X Tainted: P (2.6.25.4-10.fc8 #1) Jun 12 12:19:00 laptop kernel: EIP: 0060:[<c04cd270>] EFLAGS: 00213246 CPU: 0 Jun 12 12:19:00 laptop kernel: EIP is at task_has_capability+0x46/0x79 Jun 12 12:19:00 laptop kernel: EAX: 00000030 EBX: dee4e030 ECX: c07195e4 EDX: 00000000 Jun 12 12:19:00 laptop kernel: ESI: df191740 EDI: df18deb0 EBP: df18debc ESP: df18de6c Jun 12 12:19:00 laptop kernel: DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Jun 12 12:19:00 laptop kernel: Process X (pid: 2036, ti=df18d000 task=df160000 task.ti=df18d000) Jun 12 12:19:00 laptop kernel: Stack: c06d7792 dee4e030 df160000 00000003 df160000 dee4e030 00000000 00000000 Jun 12 12:19:00 laptop kernel: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Jun 12 12:19:00 laptop kernel: 00000000 dee4e030 df160000 df148000 df18decc c04cd2c2 df160000 e0d000c0 Jun 12 12:19:00 laptop kernel: Call Trace: Jun 12 12:19:00 laptop kernel: [<c04cd2c2>] ? selinux_capable+0x1f/0x23 Jun 12 12:19:00 laptop kernel: [<c04c9685>] ? security_capable+0xc/0xe Jun 12 12:19:00 laptop kernel: [<c042c9ff>] ? __capable+0xb/0x1f Jun 12 12:19:00 laptop kernel: [<e0bf5050>] ? firegl_cmmqs_CWDDE32+0x0/0x110 [fglrx] Jun 12 12:19:00 laptop kernel: [<c042ca23>] ? capable+0x10/0x12 Jun 12 12:19:00 laptop kernel: [<e0bda477>] ? firegl_ioctl+0xe7/0x220 [fglrx] Jun 12 12:19:00 laptop kernel: [<c0439d7f>] ? ktime_get_ts+0x45/0x49 Jun 12 12:19:00 laptop kernel: [<c0439d96>] ? ktime_get+0x13/0x2f Jun 12 12:19:00 laptop kernel: [<e0bcfc66>] ? ip_firegl_ioctl+0xe/0x10 [fglrx] Jun 12 12:19:00 laptop kernel: [<c048acfa>] ? vfs_ioctl+0x4e/0x67 Jun 12 12:19:00 laptop kernel: [<c048af75>] ? do_vfs_ioctl+0x262/0x279 Jun 12 12:19:00 laptop kernel: [<c04d016e>] ? selinux_file_ioctl+0xa8/0xab Jun 12 12:19:00 laptop kernel: [<c048afcc>] ? sys_ioctl+0x40/0x5c Jun 12 12:19:00 laptop kernel: [<c0405b7a>] ? syscall_call+0x7/0xb Jun 12 12:19:00 laptop kernel: ======================= Jun 12 12:19:00 laptop kernel: Code: 05 00 00 89 d0 f3 ab 8b 4d b8 89 d8 b2 04 c1 f8 05 c6 45 bc 03 89 5d c4 89 4d c0 74 19 48 74 11 53 68 92 77 6d c0 e8 fd 9e f5 ff <0f> 0b 58 5a eb fe ba 45 00 00 00 8b 46 08 83 e3 1f 0f b7 f2 8d Jun 12 12:19:00 laptop kernel: EIP: [<c04cd270>] task_has_capability+0x46/0x79 SS:ESP 0068:df18de6c Jun 12 12:19:00 laptop kernel: ---[ end trace fd35f97fc34637fa ]--- Jun 12 12:19:00 laptop kernel: [fglrx:firegl_release] *ERROR* device busy: 1 0 Jun 12 12:19:00 laptop kernel: [fglrx] release failed with code -EBUSY -- fedora-list mailing list fedora-list(a)redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list -- An unwillingness to embarrass oneself makes learning more difficult

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Re: SELinux References/Books
by max 12 Jun '08

12 Jun '08

On Thu, Jun 12, 2008 at 8:31 AM, Stephen Smalley <sds(a)tycho.nsa.gov> wrote: > > On Wed, 2008-06-11 at 18:28 -0400, max wrote: >> Stephen Smalley wrote: >> > On Wed, 2008-06-11 at 15:53 -0400, max wrote: >> >> I would prefer to get a desktop reference rather than having to refer >> >> to online documents or the hardcopies of individual papers I have >> >> printed off, many of which are also dated. In any case I feel like I >> >> have learned enough that I can open a book on the subject of SELinux and >> >> not get completely lost. It looks like I have basically two options : >> >> >> >> SELinux by Example: Using Security Enhanced Linux (Prentice Hall Open >> >> Source Software Development Series) by Frank Mayer, Karl MacMillan, and >> >> David Caplan (Paperback - Aug 6, 2006) >> >> >> >> SELinux: NSA's Open Source Security Enhanced Linux by Bill McCarty >> >> (Paperback - Oct 11, 2004) - Illustrated >> >> >> >> The first is more recent so I am leaning that way but I have seen >> >> opinions that suggest even it is way out of date. I don't mind spending >> >> money on a good book, reading is one of my favorite past times, but I >> >> don't want anything so dated that it won't serve as a decent reference >> >> for the near future (next year or so). I understand nothing is going to >> >> be up to the minute. Should I purchase one? or are they too out of date >> >> to even serve as good references? This is definitely something I am >> >> interested in learning about or I wouldn't bother to ask. Suggestions >> >> and advice from all corners of reality welcome. >> > >> > What kind of information are you looking for? >> > >> > The first, more recent, book includes discussion of reference policy and >> > policy modules and thus is relatively consistent with what you find in >> > modern SELinux, although newer developments like system-config-selinux, >> > setroubleshoot, etc naturally don't appear in it. It was written during >> > the development of Fedora Core 5, which marked the transition of SELinux >> > from the old way (example policy, monolithic policy) to the new way >> > (reference policy, modular policy, semanage). >> > >> >> Well I'd like to learn it all but I think a practical approach would >> mean learning to write policy first, since that is a skill I could put >> to use now. I don't expect it will be easy but that's ok, I have some >> time right now and I'd like to learn the policy language. If the first >> book covers this then I will get it. Is there a better reference for >> aspiring policy writers? I don't care about the gui tools so much, not >> that they aren't useful but I prefer to do most things myself and not >> automate it since this brings me less understanding. > > Yes, the first book covers the policy language and provides an > introduction to writing a policy module, although specific interfaces > and patterns are always evolving in the reference policy. > oss.tresys.com/projects/refpolicy is a good resource for detailed > refpolicy documentation, and the interface documentation is also locally > installed on your system under /usr/share/doc/selinux-policy-x.y.z/html. > > I don't know of a better reference at present, although it seems like we > are overdue for an updated edition of it, which could be significantly > simplified by dropping all discussion of Fedora Core 3 and 4 conventions > and focusing more specifically on how things are done now, although it > no doubt would retain some of the older information for RHEL 4 users. > > -- > Stephen Smalley > National Security Agency > > Yes a more up to date reference would be nice but SELinux by Example will do for starters. I went ahead and had the local bookstore order it in so I could flip through it before I buy it but it seems inevitable that I will make this purchase no matter what. One thing that I notice a lot of people trying to do with computers in general is memorize things. A bad idea I think, people want quick answers but without an understanding of the underlying system it just creates more confusion and ultimately leads to bigger blunders. Ego of course also gets in the way, nobody wants to look stupid so often questions go unasked, I am working on abandoning that notion as it seems to be one of the biggest barriers to learning, though a modicum of judgment is still required but I don't know if that can be taught you just have to learn it over time. Getting to know the system is of course going to require some real focus but I think in the long run it makes for a better understanding, even if it means it takes twice (or more) as long to get to my goal. One of the real barriers to understanding and acceptance is good consistent documentation that people can turn too, advancement shouldn't get frozen for the sake of publishing a book but if the basics are solid and unlikely to change too much then I think its time for an up to date reference. If you want a newcomers perspective I personally would be happy to provide it but also don't forget the mailing lists. I am sure I am not the only one trying to learn this and looking for a good guide. Posting bits to the various selinux related lists for feedback from the experienced and inexperienced users would certainly help as far as coverage and readability are concerned. Another thing I can think of, though I don't know how feasible it is, is the notion of a moderated thread. I like my mailing lists unmoderated but say for instance you want to post a how to or work on one. The thread would be restricted to one or more persons posting to it until they are finished working out whatever it is and then opened for comments. There may be many factors here that I am unaware of or that simply aren't occurring to me right now. I can't be the first person to have such an idea and it will of course be pointed out that live journals work much the same but here my point is the scope of the audience that you are reaching on a mailing list vs. an individual blog of which there are hundred's of thousands if not millions. Also it would help by adding more transparency to the process. I am no expert on mailing lists or email servers but I thought it might be worth floating the idea anyway. The other thing I noticed, while at the bookstore, is that various/most of the Linux magazines on the shelf right now have articles on security in them and one, i forget which, has a piece on SELinux. It seems its a hot topic everywhere I look. Cspan aired a rerun, from yesterday I think, of a hearing on computer spyware. I think congressmen Nelson(florida) and Pryor(?) were running the show. One of them maybe a senator but anyway there is apparently some legislation on the horizon. They had a couple of reps from various places there, including a guy from Symantec. I didn't watch the whole thing but in what I saw nobody mentioned the real problem. As far as I am concerned the "real" problem is having the widespread use of an operating system that makes things like drive by downloads so easy in the first place, where most of the security rests with a program(anti virus) that relies almost exclusively on updates but that is another debate and probably not one worth having anyway. Unfortunately it will probably take a major virus outbreak, on a scale we have yet to see, or a massive, widespread, and very public breach of security to wake people up. I will go ahead and shutdown here, my real point is that it seems people are starting to pay a lot more attention :^). Thanks for the feedback. Max -- I am altering the deal. Pray I do not alter it any further. --Darth Vader

1 0

[MLS Policy]:- MLS policy enforcing mode problem when manully restart the system services.
by prakash hallalli 12 Jun '08

12 Jun '08

HI ALL I have configured SELinux on ContOS 5.1. I have configured the RBAC using MLS (Multilevel Security) Policy using enforcing mode. I am trying to restart the system services and they are not restarting and it is throwing some error message. Steps to reproduce: 1 ) MLS Policy configuration. 1. Install selinux-policy-mls 2. Set SELINUXTYPE=MLS in /etc/selinux/config file 3. touch ./autorelabel; on root's home directory, and reboot the machine. 4. While machine is rebooting, change the GRUB parameter. enforcing=0 2) Now system is in permissive mode and SELinux status is as follows. [root@turtle11 ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: permissive Mode from config file: enforcing Policy version: 21 Policy from config file: mls 3) Restart the system services and they restart successfully. [root@turtle11 ~]# service nfs restart Shutting down NFS mountd: [ OK ] Shutting down NFS daemon: [ OK ] Shutting down NFS quotas: [ OK ] Shutting down NFS services: [ OK ] Starting NFS services: [ OK ] Starting NFS quotas: [ OK ] Starting NFS daemon: [ OK ] Starting NFS mountd: [ OK ] 3) Now i am setting enforcing mode using setenforce command. root@turtle11 ~]#setenforce 1 root@turtle11 ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: enforcing Mode from config file: enforcing Policy version: 21 Policy from config file: mls 4) a) Now system is in enforcing mode and i am trying to restart the system service. The restart will result in error message. [root@turtle11 ~]# service nfs restart nfs: unrecognized service [root@turtle11 ~]# run_init /etc/init.d/nfs restart Authenticating root. Password: XXXXXX run_init: incorrect password for root authentication failed. [root@turtle11 ~]# [root@turtle11 ~]# run_init /etc/init.d/ldap restart Authenticating root. Password: XXXXXX run_init: incorrect password for root authentication failed. 5) I am using sysadm_r [root@turtle11 ~]# id uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=root:sysadm_r:sysadm_t:SystemLow-SystemHigh [root@turtle11 ~]# 6) This is i am getting /sbin/ausearch log messages. [root@turtle11 ~]#/sbin/ausearch -i -m AVC -sv no type=SYSCALL msg=audit(06/11/2008 20:01:29.285:130367) : arch=x86_64 syscall=recvfrom success=no exit=-13(Permission denied) a0=5 a1=7fff60825b40 a2=5dc a3=0 items=0 ppid=1 pid=3103 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) comm=dhcpd exe=/usr/sbin/dhcpd subj=root:sysadm_r:sysadm_t:s0-s15:c0.c1023 key=(null) type=AVC msg=audit(06/11/2008 20:01:29.285:130367) : avc: denied { read } for pid=3103 comm=dhcpd lport=1 scontext=root:sysadm_r:sysadm_t:s0-s15:c0.c1023 tcontext=root:sysadm_r:sysadm_t:s0-s15:c0.c1023 tclass=rawip_socket please help me. what is going on. Thanks Prakash.

2 3

selinux and httpd don't start on boot - message error EAI9
by Carlos Chavez 12 Jun '08

12 Jun '08

Hello everyone. the HTTP server don't start on boot, it send the following message sort of, it was difficult to copy because it showed only in the start up process and no log messages in any log file. Message: Address Family for Hostname not supported: (EAI 9) alloc_listener failed to setup sockaddr for 127.0.0.1. That is the message sort of. This happen when i setup the option Listen 127.0.0.1:80, when i start manually the httpd server start successfully, but not on boot. It say too that there is an syntax error in the line where is the sentence Listen, but if i run the syntax check the HTTP said the syntax is OK. I'm using fedora 9 with the latest updates. selinux 3.3.1-55 httpd 2.2.8-3 kernel 2.6.25.3-18 -- Cheers. Carlos Chávez

5 12

Problems with DNS logging
by Dan Thurman 12 Jun '08

12 Jun '08

I discovered that my logging somewhat failed: 1) I tried to use the link provided to submit a buzilla and apparently it brought up bluefish and within asks for my account name and password, and I tried to save this file but in doing so it failed to backup the file, so I clicked "continue" and it froze up. What am I doing wrong? 2) The specific selinux error is as follows: ============================================= Summary: SELinux is preventing named (named_t) "write" to ./named (named_conf_t). Detailed Description: SELinux denied access requested by named. It is not expected that this access is required by named and this access may signal an intrusion attempt. It is also possible that the specific version or configuration of the application is causing it to require additional access. Allowing Access: Sometimes labeling problems can cause SELinux denials. You could try to restore the default system file context for ./named, restorecon -v './named' If this does not work, there is currently no automatic way to allow this access. Instead, you can generate a local policy module to allow this access - see FAQ (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable SELinux protection altogether. Disabling SELinux protection is not recommended. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Additional Information: Source Context system_u:system_r:named_t:s0 Target Context system_u:object_r:named_conf_t:s0 Target Objects ./named [ dir ] Source named Source Path /usr/sbin/named Port <Unknown> Host gold.cdkkt.com Source RPM Packages bind-9.5.0-27.rc1.fc8 Target RPM Packages Policy RPM selinux-policy-3.0.8-109.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall_file Host Name gold.cdkkt.com Platform Linux gold.cdkkt.com 2.6.25.4-10.fc8 #1 SMP Thu May 22 23:34:09 EDT 2008 i686 i686 Alert Count 3 First Seen Tue 10 Jun 2008 07:38:58 AM PDT Last Seen Tue 10 Jun 2008 07:52:54 AM PDT Local ID 616a532f-b429-435d-bf97-e1d8427cc638 Line Numbers Raw Audit Messages host=gold.cdkkt.com type=AVC msg=audit(1213109574.740:334): avc: denied { write } for pid=10160 comm="named" name="named" dev=sdb5 ino=2622969 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:named_conf_t:s0 tclass=dir host=gold.cdkkt.com type=SYSCALL msg=audit(1213109574.740:334): arch=40000003 syscall=38 success=no exit=-13 a0=b543b4e8 a1=b7ea5ad2 a2=470214 a3=b7ea5ad2 items=0 ppid=10158 pid=10160 auid=500 uid=25 gid=25 euid=25 suid=25 fsuid=25 egid=25 sgid=25 fsgid=25 tty=(none) ses=1 comm="named" exe="/usr/sbin/named" subj=system_u:system_r:named_t:s0 key=(null) Thanks! Dan

2 2

SELinux References/Books
by max 11 Jun '08

11 Jun '08

I would prefer to get a desktop reference rather than having to refer to online documents or the hardcopies of individual papers I have printed off, many of which are also dated. In any case I feel like I have learned enough that I can open a book on the subject of SELinux and not get completely lost. It looks like I have basically two options : SELinux by Example: Using Security Enhanced Linux (Prentice Hall Open Source Software Development Series) by Frank Mayer, Karl MacMillan, and David Caplan (Paperback - Aug 6, 2006) SELinux: NSA's Open Source Security Enhanced Linux by Bill McCarty (Paperback - Oct 11, 2004) - Illustrated The first is more recent so I am leaning that way but I have seen opinions that suggest even it is way out of date. I don't mind spending money on a good book, reading is one of my favorite past times, but I don't want anything so dated that it won't serve as a decent reference for the near future (next year or so). I understand nothing is going to be up to the minute. Should I purchase one? or are they too out of date to even serve as good references? This is definitely something I am interested in learning about or I wouldn't bother to ask. Suggestions and advice from all corners of reality welcome. Max -- An unwillingness to embarrass oneself makes learning more difficult

2 1

[MLS Policy]:- MLS policy problem when manully restart the servers .
by prakash hallalli 10 Jun '08

10 Jun '08

Hi All I have configured SELinux on ContOS 5.1. I have configured the RBAC using MLS (Multilevel Security) Policy. Now i am trying to restart the system services and they are not restarting and it is throwing some error message. I have a question here, with mls policy enabled will i be able to restart the system service? If yes then what to do and If no what is the reason? Steps to reproduce: 1) MLS Policy configuration. 1. Install selinux-policy-mls 2. Set SELINUXTYPE=MLS in /etc/selinux/config file 3. touch ./autorelabel; on root's home directory, and reboot the machine. 4. While machine is rebooting, change the GRUB parameter. enforcing=0 2) Now system is in permissive mode and SELinux status is as follows. # sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: permissive Mode from config file: enforcing Policy version: 21 policy from config file: mls 3) Restart the system services and they restart successfully. [root@turtle11 ~]# service nfs restart Shutting down NFS mountd: [FAILED] Shutting down NFS daemon: [FAILED] Shutting down NFS quotas: [FAILED] Shutting down NFS services: [FAILED] Starting NFS services: [ OK ] Starting NFS quotas: [ OK ] Starting NFS daemon: [ OK ] Starting NFS mountd: [ OK ] 4) Now i am setting enforcing mode using setenforce command. root@turtle11 ~]#setenforce 1 root@turtle11 ~]# sestatus SELinux status: enabled SELinuxfs mount: /selinux Current mode: enforcing Mode from config file: enforcing Policy version: 21 Policy from config file: mls 5) a) Now system is in enforcing mode and i am trying to restart the system service. The restart will result in error message. root@turtle11 ~]#service nfs restart /sbin/consoletype: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory /sbin/consoletype: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory nfs: unrecognized service b) When I trying to login it will show the following error. turtle login: smbldap3 /bin/login:error while loading shared libraries: libcrypt.so.1:failed to map segment from shared object: Permission denied /sbin/mingetty: error while loading shared libraries: libc.so.6: failed to map segment from shared object: Permission denied c) When using su command. root@turtle11 ~]# su smbldap3 su: error while loading shared libraries: libpam.so.0: failed to map segment from shared object: Permission denied I am not sure what is going on. I referred to many websites and PDFs but couldn't get the proper solution. please help me. Thanks Prakash.

3 2

[ccosta@gmail.com: Re: [PHP] Problems connecting (from php to pg)]
by Jeff MacDonald 09 Jun '08

09 Jun '08

Greetings, I felt this would be of interest to the selinux list, so I am forwarding it along. Regards, jam ----- Forwarded message from Carlos Costa <ccosta(a)gmail.com> ----- Date: Mon, 9 Jun 2008 22:50:15 +0200 From: Carlos Costa <ccosta(a)gmail.com> To: Daniel Alejandro <dcarreroc(a)gmail.com> Cc: pgsql-php(a)postgresql.org Subject: Re: [PHP] Problems connecting (from php to pg) Thank you, Daniel and all. My problem was not related to pg, but to selinux. I disabled selinux, and all runs fine now. On Mon, Jun 9, 2008 at 10:17 PM, Daniel Alejandro <dcarreroc(a)gmail.com> wrote: > 2008/6/7 Carlos Costa <ccosta(a)gmail.com>: >> Hello all, >> >> I've the "standard connection error": >> >> Unable to connect to PostgreSQL server: could not connect to server: >> Permission denied. >> Is the server running on host "localhost" and accepting TCP/IP >> connections on port 5432? >> >> The system is, yes, running and -I think- accepting TCP/IP connections >> (I've tested this with netstat, I can connect to it with psql -h >> localhost, and so). >> >> In the server where I am testing this I have FC7 installed, so the php >> and the pgsql-php packages are: >> >> PHP Version 5.2.6 >> PostgreSQL(libpq) Version 8.2.7 >> >> I think that there is a problem in the pgsql-php module. I've created >> a ssh tunnel, and trying the connection to the same database from >> other server (with PHP Version 5.2.5-3 and pgsql that supports >> postgresql 8.3.0). >> >> The postgresql version in the server is the 8.3.0. >> >> What can we do? I am doing these tests with a simple php code (just a >> pg_connect()). >> >> Thanks in advance, >> Carlos. >> >> -- >> Sent via pgsql-php mailing list (pgsql-php(a)postgresql.org) >> To make changes to your subscription: >> http://www.postgresql.org/mailpref/pgsql-php >> > Did you check your pg_hba.conf file ??? > > Bye :) > -- > Daniel Carrero Canales > -- Sent via pgsql-php mailing list (pgsql-php(a)postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-php ----- End forwarded message -----

2 1

[PATCH 1/2] LiveCD - Add fake /selinux so livecd can run in enforcing
by Eric Paris 09 Jun '08

09 Jun '08

From: Eric Paris <eparis(a)redhat.com> This patch adds a /selinux directory to a newly created livecd compose which will allow the tools inside the chroot to interoperate with the live system successfully. Signed-off-by: Eric Paris <eparis(a)redhat.com> --- imgcreate/creator.py | 55 ++++++++++++++++++++++++++++++++++++++++++++--- imgcreate/kickstart.py | 2 +- 2 files changed, 52 insertions(+), 5 deletions(-) diff --git a/imgcreate/creator.py b/imgcreate/creator.py index 5d010a1..f65f7d4 100644 --- a/imgcreate/creator.py +++ b/imgcreate/creator.py @@ -24,6 +24,7 @@ import tempfile import shutil import logging +import selinux import yum import rpm @@ -421,6 +422,52 @@ class ImageCreator(object): os.symlink('/proc/self/fd/2', self._instroot + "/dev/stderr") os.umask(origumask) + def __create_selinuxfs(self): + # if selinux exists on the host we need to lie to the chroot + if os.path.exists("/selinux/enforce"): + selinux_dir = self._instroot + "/selinux" + + # enforce=0 tells the chroot selinux is not enforcing + # policyvers=999 tell the chroot to make the highest version of policy it can + files = (('/enforce', '0'), + ('/policyvers', '999')) + for (file, value) in files: + fd = os.open(selinux_dir + file, os.O_WRONLY | os.O_TRUNC | os.O_CREAT) + os.write(fd, value) + os.close(fd) + + # we steal mls from the host system for now, might be best to always set it to 1???? + files = ("/mls",) + for file in files: + shutil.copyfile("/selinux" + file, selinux_dir + file) + + # make /load -> /dev/null so chroot policy loads don't hurt anything + os.mknod(selinux_dir + "/load", 0666 | stat.S_IFCHR, os.makedev(1, 3)) + + # selinux is on in the kickstart, so clean up as best we can to start + if kickstart.selinux_enabled(self.ks): + # label the fs like it is a root before the bind mounting + arglist = ["/sbin/setfiles", "-F", "-r", self._instroot, selinux.selinux_file_context_path(), self._instroot] + subprocess.call(arglist, close_fds = True) + # these dumb things don't get magically fixed, so make the user generic + for f in ("/proc", "/sys", "/selinux"): + arglist = ["/usr/bin/chcon", "-u", "system_u", self._instroot + f] + subprocess.call(arglist, close_fds = True) + + def __destroy_selinuxfs(self): + # if the system was running selinux clean up our lies + if os.path.exists("/selinux/enforce"): + files = ('/enforce', + '/policyvers', + '/mls', + '/load') + for file in files: + try: + os.unlink(self._instroot + "/selinux" + file) + except OSError: + pass + + def mount(self, base_on = None, cachedir = None): """Setup the target filesystem in preparation for an install. @@ -446,7 +493,7 @@ class ImageCreator(object): self._mount_instroot(base_on) - for d in ("/dev/pts", "/etc", "/boot", "/var/log", "/var/cache/yum"): + for d in ("/dev/pts", "/etc", "/boot", "/var/log", "/var/cache/yum", "/sys", "/proc", "/selinux"): makedirs(self._instroot + d) cachesrc = cachedir or (self.__builddir + "/yum-cache") @@ -458,9 +505,7 @@ class ImageCreator(object): (cachesrc, "/var/cache/yum")]: self.__bindmounts.append(BindChrootMount(f, self._instroot, dest)) - # /selinux should only be mounted if selinux is enabled (enforcing or permissive) - if kickstart.selinux_enabled(self.ks): - self.__bindmounts.append(BindChrootMount("/selinux", self._instroot, None)) + self.__create_selinuxfs() self._do_bindmounts() @@ -483,6 +528,8 @@ class ImageCreator(object): except OSError: pass + self.__destroy_selinuxfs() + self._undo_bindmounts() self._unmount_instroot() diff --git a/imgcreate/kickstart.py b/imgcreate/kickstart.py index c83e795..180cea2 100644 --- a/imgcreate/kickstart.py +++ b/imgcreate/kickstart.py @@ -389,7 +389,7 @@ class SelinuxConfig(KickstartConfig): if not os.path.exists(self.path("/sbin/restorecon")): return - self.call(["/sbin/restorecon", "-l", "-v", "-r", "/"]) + self.call(["/sbin/restorecon", "-l", "-v", "-r", "-F", "-e", "/proc", "-e", "/sys", "-e", "/dev", "-e", "/selinux", "/"]) def apply(self, ksselinux): if os.path.exists(self.path("/usr/sbin/lokkit")): -- 1.5.5.3

3 4

[RFC] -v2 livecd running and selinux enforcing
by Eric Paris 06 Jun '08

06 Jun '08

Still ongoing selinux policy and toolchain work in this area is needed and I should do more testing on a host machine with selinux disabled but this is the livecd patch I've got working as of today. I think that I want to make my print >> sys.stderr message actually be fatal. The reason for this is because setting selinux --disabled in the kickstart and not having /usr/sbin/lokkit results in an enabled livecd which doesn't work... No reason to just print a message and not stop the work if we know for sure the results are useless... This patch also has the f.close() fix that I sent yesterday, so it might not apply if you already applied that one... -Eric diff -Naupr imgcreate.orig/creator.py imgcreate/creator.py --- imgcreate.orig/creator.py 2008-05-06 12:16:08.000000000 -0400 +++ imgcreate/creator.py 2008-06-05 17:10:36.561313078 -0400 @@ -23,6 +23,7 @@ import sys import tempfile import shutil +import selinux import yum import rpm @@ -402,6 +403,52 @@ class ImageCreator(object): fstab.write(self._get_fstab()) fstab.close() + def __create_selinuxfs(self): + # if selinux exists on the host we need to lie to the chroot + if os.path.exists("/selinux/enforce"): + selinux_dir = self._instroot + "/selinux" + + # enforce=0 tells the chroot selinux is not enforcing + # policyvers=999 tell the chroot to make the highest version of policy it can + files = (('/enforce', '0'), + ('/policyvers', '999')) + for (file, value) in files: + fd = os.open(selinux_dir + file, os.O_WRONLY | os.O_TRUNC | os.O_CREAT) + os.write(fd, value) + os.close(fd) + + # we steal mls from the host system for now, might be best to always set it to 1???? + files = ("/mls",) + for file in files: + shutil.copyfile("/selinux" + file, selinux_dir + file) + + # make /load -> /dev/null so chroot policy loads don't hurt anything + os.mknod(selinux_dir + "/load", 0666 | stat.S_IFCHR, os.makedev(1, 3)) + + # selinux is on in the kickstart, so clean up as best we can to start + if kickstart.selinux_enabled(self.ks): + # label the fs like it is a root before the bind mounting + arglist = ["/sbin/setfiles", "-F", "-r", self._instroot, selinux.selinux_file_context_path(), self._instroot] + subprocess.call(arglist, close_fds = True) + # these dumb things don't get magically fixed, so make the user generic + for f in ("/proc", "/sys", "/selinux"): + arglist = ["/usr/bin/chcon", "-u", "system_u", self._instroot + f] + subprocess.call(arglist, close_fds = True) + + def __destroy_selinuxfs(self): + # if the system was running selinux clean up our lies + if os.path.exists("/selinux/enforce"): + files = ('/enforce', + '/policyvers', + '/mls', + '/load') + for file in files: + try: + os.unlink(self._instroot + "/selinux" + file) + except OSError: + pass + + def mount(self, base_on = None, cachedir = None): """Setup the target filesystem in preparation for an install. @@ -427,7 +474,7 @@ class ImageCreator(object): self._mount_instroot(base_on) - for d in ("/dev/pts", "/etc", "/boot", "/var/log", "/var/cache/yum"): + for d in ("/dev/pts", "/etc", "/boot", "/var/log", "/var/cache/yum", "/sys", "/proc", "/selinux"): makedirs(self._instroot + d) cachesrc = cachedir or (self.__builddir + "/yum-cache") @@ -439,10 +486,6 @@ class ImageCreator(object): (cachesrc, "/var/cache/yum")]: self.__bindmounts.append(BindChrootMount(f, self._instroot, dest)) - # /selinux should only be mounted if selinux is enabled (enforcing or permissive) - if kickstart.selinux_enabled(self.ks): - self.__bindmounts.append(BindChrootMount("/selinux", self._instroot, None)) - # Create minimum /dev origumask = os.umask(0000) devices = [('null', 1, 3, 0666), @@ -460,6 +503,8 @@ class ImageCreator(object): os.symlink('/proc/self/fd/2', self._instroot + "/dev/stderr") os.umask(origumask) + self.__create_selinuxfs() + self._do_bindmounts() os.symlink("../proc/mounts", self._instroot + "/etc/mtab") @@ -479,6 +524,8 @@ class ImageCreator(object): except OSError: pass + self.__destroy_selinuxfs() + self._undo_bindmounts() self._unmount_instroot() @@ -543,7 +590,17 @@ class ImageCreator(object): for pkg in kickstart.get_excluded(self.ks, self._get_excluded_packages()): ayum.deselectPackage(pkg) - + + # if the system is running selinux and the kickstart wants it disabled + # we need /usr/sbin/lokkit + def __can_handle_selinux(self, ayum): + has_req = 1 + file = "/usr/sbin/lokkit" + if not kickstart.selinux_enabled(self.ks) and os.path.exists("/selinux/enforce"): + has_req = ayum.installHasFile(file) + if not has_req: + print >> sys.stderr, "Dude, you need a package which provides %s for your selinux setup to work" %(file) + def install(self, repo_urls = {}): """Install packages into the install root. @@ -579,6 +636,9 @@ class ImageCreator(object): self.__select_packages(ayum) self.__select_groups(ayum) self.__deselect_packages(ayum) + + self.__can_handle_selinux(ayum) + ayum.runInstall() except yum.Errors.RepoError, e: raise CreatorError("Unable to download from repo : %s" % (e,)) diff -Naupr imgcreate.orig/kickstart.py imgcreate/kickstart.py --- imgcreate.orig/kickstart.py 2008-05-06 12:16:08.000000000 -0400 +++ imgcreate/kickstart.py 2008-06-04 14:56:35.033603440 -0400 @@ -369,14 +369,15 @@ class SelinuxConfig(KickstartConfig): path = self.path(fn) f = file(path, "w+") os.chmod(path, 0644) + f.close() if ksselinux.selinux == ksconstants.SELINUX_DISABLED: return - if not os.path.exists(self.path("/sbin/restorecon")): + if os.path.exists(self.path("/sbin/restorecon")): + self.call(["/sbin/restorecon", "-l", "-v", "-r", "-F", "-e", "/proc", "-e", "/sys", "-e", "/dev", "-e", "/selinux", "/"]) + else: return - self.call(["/sbin/restorecon", "-l", "-v", "-r", "/"]) - def apply(self, ksselinux): if os.path.exists(self.path("/usr/sbin/lokkit")): args = ["/usr/sbin/lokkit", "-f", "--quiet", "--nostart"] diff -Naupr imgcreate.orig/yuminst.py imgcreate/yuminst.py --- imgcreate.orig/yuminst.py 2008-05-06 12:16:08.000000000 -0400 +++ imgcreate/yuminst.py 2008-06-05 17:00:00.574631892 -0400 @@ -79,7 +79,7 @@ class LiveCDYum(yum.YumBase): def selectPackage(self, pkg): """Select a given package. Can be specified with name.arch or name*""" return self.install(pattern = pkg) - + def deselectPackage(self, pkg): """Deselect package. Can be specified as name.arch or name*""" sp = pkg.rsplit(".", 2) @@ -138,6 +138,20 @@ class LiveCDYum(yum.YumBase): repo.setCallback(TextProgress()) self.repos.add(repo) return repo + + def installHasFile(self, file): + has_file = 0 + provides_pkg = self.whatProvides(file, None, None) + dlpkgs = map(lambda x: x.po, filter(lambda txmbr: txmbr.ts_state in ("i", "u"), self.tsInfo.getMembers())) + for p in dlpkgs: + for q in provides_pkg: + if (p == q): + has_file = 1 + if has_file: + return True + else: + return False + def runInstall(self): os.environ["HOME"] = "/"

3 2

AVCs from cron.daily (F9)
by Paul Howarth 04 Jun '08

04 Jun '08

On my work box, which is an up-to-date F9 install, I get a set of AVCs from cron.daily every day, which I don't get on my home boxes. I suspect it's because we use LDAP auth at work. It boils down to this when passed through audit2allow -R: require { type logwatch_t; type locate_t; type tmpreaper_t; type logrotate_t; } #============= locate_t ============== cron_rw_tcp_sockets(locate_t) #============= logrotate_t ============== cron_rw_tcp_sockets(logrotate_t) #============= logwatch_t ============== cron_rw_tcp_sockets(logwatch_t) #============= tmpreaper_t ============== cron_rw_tcp_sockets(tmpreaper_t) Sample AVC: time->Tue Jun 3 05:05:05 2008 type=SYSCALL msg=audit(1212465905.734:5714): arch=c000003e syscall=59 success=yes exit=0 a0=25545d0 a1=2551360 a2=25539a0 a3=8 items=0 ppid=12101 pid=12134 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=605 comm="tmpwatch" exe="/usr/sbin/tmpwatch" subj=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 key=(null) type=AVC msg=audit(1212465905.734:5714): avc: denied { read write } for pid=12134 comm="tmpwatch" path="socket:[24785059]" dev=sockfs ino=24785059 scontext=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:crond_t:s0-s0:c0.c1023 tclass=tcp_socket Paul.

2 3

strange messages while installing selinux-policy-targeted
by Dr. Michael J. Chudobiak 04 Jun '08

04 Jun '08

I can't seem to make selinux run on one of my systems. Can anyone make sense of these odd installation messages: Running Transaction Installing : selinux-policy-targeted [1/1] libsemanage.dbase_llist_query: could not query record value (No such file or directory). /usr/sbin/semanage: range not supported on Non MLS machines /usr/sbin/semanage: range not supported on Non MLS machines /usr/sbin/semanage: range not supported on Non MLS machines libsepol.sepol_user_modify: MLS is enabled, but no MLS default level was defined for user guest_u libsepol.sepol_user_modify: could not load (null) into policy libsemanage.dbase_policydb_modify: could not modify record value libsemanage.semanage_base_merge_components: could not merge local modifications into policy /usr/sbin/semanage: Could not add SELinux user guest_u libsepol.sepol_user_modify: MLS is enabled, but no MLS default level was defined for user xguest_u libsepol.sepol_user_modify: could not load (null) into policy libsemanage.dbase_policydb_modify: could not modify record value libsemanage.semanage_base_merge_components: could not merge local modifications into policy /usr/sbin/semanage: Could not add SELinux user xguest_u Installed: selinux-policy-targeted.noarch 0:3.3.1-55.fc9 Complete! - Mike

2 1

Sendmail milters in Fedora 8
by Paul Howarth 03 Jun '08

03 Jun '08

Since upgrading my mail server from Fedora 7 to Fedora 8, I've come across some problems with the sockets used for communication between sendmail and two of the "milter" plugins I'm using with it, namely milter-regex and spamass-milter. It's very likely that other milters will have similar issues. The sockets used are created when the milter starts, as follows: milter-regex: /var/spool/milter-regex/sock (var_spool_t, inherited from parent directory) spamass-milter: /var/run/spamass-milter/spamass-milter.sock (spamd_var_run_t, in policy) These are pretty well the upstream locations, though I'm open to moving the milter-regex socket from /var/spool to /var/run or elsewhere for consistency. Since moving to Fedora 8, I've had to add the following to local policy to get these milters working: allow sendmail_t spamd_var_run_t:dir { search getattr }; allow sendmail_t spamd_var_run_t:sock_file { getattr write }; allow sendmail_t var_spool_t:sock_file { getattr write }; allow sendmail_t initrc_t:unix_stream_socket { read write connectto }; The last of these is the strangest, and relates to Bug #425958 (https://bugzilla.redhat.com/show_bug.cgi?id=425958) Whilst the socket file itself has the context listed above, the unix domain socket that sendmail connects to is still initrc_t, as can be seen from the output of "netstat -lpZ": ... unix 2 [ ACC ] STREAM LISTENING 14142 5853/spamass-milter system_u:system_r:initrc_t:s0 /var/run/spamass-milter/spamass-milter.sock unix 2 [ ACC ] STREAM LISTENING 13794 5779/milter-regex system_u:system_r:initrc_t:s0 /var/spool/milter-regex/sock ... So, my questions are: 1. Why are the sockets still initrc_t? 2. Is this a kernel issue or a userspace issue that should be fixed in the milters? 3. Should there be a standard place for milter sockets to live, and if so, where? 4. How come this worked OK in Fedora 7 and previous releases? Paul.

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Issues setting up a 2nd Private DNS server
by Dan Thurman 02 Jun '08

02 Jun '08

I am trying to setup a 2nd private DNS server in my private network, behind the firewall (with DNS access enabled) and I am able to resolve all of my local systems. However, I have some problems. One involves SELinux and the other involved forwarding as shown below: 1) SELinux errors are reported only when starting/stopping/restarting named. ++++++++++++++++++++++++++++++++++++++++++++++ Source Context system_u:system_r:named_t:s0 Target Context system_u:system_r:unconfined_t:s0 Target Objects socket [ unix_stream_socket ] Source named-checkconf Source Path /usr/sbin/named-checkconf Port <Unknown> Host gold.cdkkt.com Source RPM Packages bind-9.5.0-26.b3.fc8 Target RPM Packages Policy RPM selinux-policy-3.0.8-101.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name gold.cdkkt.com Platform Linux gold.cdkkt.com 2.6.24.7-92.fc8 #1 SMP Wed May 7 16:50:09 EDT 2008 i686 i686 Alert Count 4 First Seen Mon 02 Jun 2008 10:00:25 AM PDT Last Seen Mon 02 Jun 2008 10:01:43 AM PDT Local ID 7faef252-f1ea-4e36-8f51-167799fcb429 Line Numbers Raw Audit Messages host=gold.cdkkt.com type=AVC msg=audit(1212426103.808:4122): avc: denied { read write } for pid=7037 comm="named" path="socket:[874313]" dev=sockfs ino=874313 scontext=system_u:system_r:named_t:s0 tcontext=system_u:system_r:unconfined_t:s0 tclass=unix_stream_socket host=gold.cdkkt.com type=SYSCALL msg=audit(1212426103.808:4122): arch=40000003 syscall=11 success=yes exit=0 a0=9b05a68 a1=9b05e38 a2=9b04fe0 a3=0 items=0 ppid=7036 pid=7037 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="named" exe="/usr/sbin/named" subj=system_u:system_r:named_t:s0 key=(null) ++++++++++++++++++++++++++++++++++++++++++++++ Source Context system_u:system_r:ndc_t:s0 Target Context system_u:system_r:unconfined_t:s0 Target Objects socket [ unix_stream_socket ] Source rndc Source Path /usr/sbin/rndc Port <Unknown> Host gold.cdkkt.com Source RPM Packages bind-9.5.0-26.b3.fc8 Target RPM Packages Policy RPM selinux-policy-3.0.8-101.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name gold.cdkkt.com Platform Linux gold.cdkkt.com 2.6.24.7-92.fc8 #1 SMP Wed May 7 16:50:09 EDT 2008 i686 i686 Alert Count 4 First Seen Mon 02 Jun 2008 10:00:23 AM PDT Last Seen Mon 02 Jun 2008 10:01:43 AM PDT Local ID cc0e5f4b-aa41-4543-9569-df7d65f83f1c Line Numbers Raw Audit Messages host=gold.cdkkt.com type=AVC msg=audit(1212426103.905:4123): avc: denied { read write } for pid=7064 comm="rndc" path="socket:[874313]" dev=sockfs ino=874313 scontext=system_u:system_r:ndc_t:s0 tcontext=system_u:system_r:unconfined_t:s0 tclass=unix_stream_socket host=gold.cdkkt.com type=SYSCALL msg=audit(1212426103.905:4123): arch=40000003 syscall=11 success=yes exit=0 a0=90000d0 a1=9000078 a2=8fe12e0 a3=0 items=0 ppid=7055 pid=7064 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="rndc" exe="/usr/sbin/rndc" subj=system_u:system_r:ndc_t:s0 key=(null) ++++++++++++++++++++++++++++++++++++++++++++++ Source Context system_u:system_r:mount_t:s0 Target Context system_u:system_r:unconfined_t:s0 Target Objects socket [ unix_stream_socket ] Source umount Source Path /bin/umount Port <Unknown> Host gold.cdkkt.com Source RPM Packages util-linux-ng-2.13.1-2.fc8 Target RPM Packages Policy RPM selinux-policy-3.0.8-101.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name gold.cdkkt.com Platform Linux gold.cdkkt.com 2.6.24.7-92.fc8 #1 SMP Wed May 7 16:50:09 EDT 2008 i686 i686 Alert Count 4 First Seen Mon 02 Jun 2008 10:00:25 AM PDT Last Seen Mon 02 Jun 2008 10:01:43 AM PDT Local ID 439fbb1b-17d2-40b4-9242-744d5d69e303 Line Numbers Raw Audit Messages host=gold.cdkkt.com type=AVC msg=audit(1212426103.790:4120): avc: denied { read write } for pid=7034 comm="mount" path="socket:[874313]" dev=sockfs ino=874313 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:system_r:unconfined_t:s0 tclass=unix_stream_socket host=gold.cdkkt.com type=SYSCALL msg=audit(1212426103.790:4120): arch=40000003 syscall=11 success=yes exit=0 a0=870e610 a1=86e8fa8 a2=86eb2e0 a3=0 items=0 ppid=7014 pid=7034 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="mount" exe="/bin/mount" subj=system_u:system_r:mount_t:s0 key=(null) ++++++++++++++++++++++++++++++++++++++++++++++ 2) Forwarders do not work: ++++++++++++++++++++++++++++++++++++++++++++++ ** server can't find msn.com: NXDOMAIN ++++++++++++++++++++++++++++++++++++++++++++++ Please advise, Dan

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selinux June 2008