January 2009 - selinux - Fedora Mailing-Lists

Memory protection and system-config-securitylevel

by Kamil J. Dudek

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

13 years, 8 months

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mount point labels

by Clarkson, Mike R (US SSA)

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

13 years, 8 months

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bind-mounted homedirs

by Paul Howarth

On a RHEL 5 server I have bind-mounted home directories, where the data on the server actually lives in /srv/homes but this is bind-mounted to /nis-home. The user home directories in LDAP refer to the /nis-home locations. When I updated to the 5.3 selinux policy, everything under /srv/homes got relabelled based on the /srv/homes pathname rather than the /nis-home pathname. What would be the best way of preventing this from happening in the future? Paul.

14 years, 3 months

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New fedora cgit packages could use some policy updates

by Todd Zullinger

Greetings, I added a cgit package to Fedora yesterday. It's only in rawhide at the moment. cgit is a cgi used to provide a web interface for viewing git repositories (similar to gitweb¹). Is the preferred method to add policy to the selinux-policy package or are package policy modules the way to go? I thought the former was preferred, but I can't find anything on the wiki other than http://fedoraproject.org/wiki/PackagingDrafts/SELinux, which seems like it might have been a stalled attempt. The cgit requirements are fairly minimal, AFAICT. It needs: * write access to its cache dir, /var/cache/cgit * read access to git repositories, which default to /var/lib/git, but are likely to be changed by admins (/srv/git is one popular choice). For the moment, I created a README.SELinux file in the package that details how to set generic contexts to allow the package to work². That README suggests httpd_sys_content_rw_t for the cache and httpd_sys_content_t (or public_content_t) for the git repos. It's quite likely that we'd want a more specific type for the cache dir especially. Additionally, the cgi itself needs to be httpd_sys_script_exec_t, which happens automagically by virtue of installing it in /var/www/cgi-bin/cgit. Any help or suggestions would be most welcome. I'd like to get these things worked out before I build the package for F-9, F-10, and EL-5. If crafting a policy requires moving anything around, I'd like to do that before many users install the package and modify their configs. ¹ gitweb has some SELinux issues on F-10 itself, I filed this as https://bugzilla.redhat.com/479613 the other day. ² http://cvs.fedoraproject.org/viewvc/rpms/cgit/devel/README.SELinux?view=co -- Todd OpenPGP -> KeyID: 0xBEAF0CE3 | URL: www.pobox.com/~tmz/pgp ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Well at first I was skeptical but then I thought I could be like Hillary Clinton, just without the penis. -- Lois Griffin, The Family Guy

14 years, 3 months

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Denials from spamc and webalizer on Centos 5.2

by Richard Chapman

After some trouble getting the file-system relabelled - which was eventually solved by Daniel's suggestion to change to a 5.3 preview release of the policy packages - I now have (only) a couple of intractable denials. One seems to be related to procmail running spamc. The other seems to be webalizer being denied access to squid logs. Here is some representative troubledhooter output: Summary SELinux is preventing spamc (procmail_t) "execute" to ./spamc (spamc_exec_t). Detailed Description [SELinux is in permissive mode, the operation would have been denied but was permitted due to permissive mode.] SELinux denied access requested by spamc. It is not expected that this access is required by spamc 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 ./spamc, restorecon -v './spamc' 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:procmail_t Target Context: system_u:object_r:spamc_exec_t Target Objects: ./spamc [ file ] Source: spamc Source Path: /usr/bin/spamc Port: <Unknown> Host: C5.aardvark.com.au Source RPM Packages: spamassassin-3.2.4-1.el5 Target RPM Packages: Policy RPM: selinux-policy-2.4.6-203.el5 Selinux Enabled: True Policy Type: targeted MLS Enabled: True Enforcing Mode: Permissive Plugin Name: catchall_file Host Name: C5.aardvark.com.au Platform: Linux C5.aardvark.com.au 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64 x86_64 Alert Count: 199 First Seen: Wed Jan 7 21:12:56 2009 Last Seen: Sat Jan 10 13:50:07 2009 Local ID: 72201679-d161-4d2d-8423-44b1b65a211f Line Numbers: Raw Audit Messages : host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { execute } for pid=16474 comm="procmail" name="spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { execute } for pid=16474 comm="procmail" name="spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { execute_no_trans } for pid=16474 comm="procmail" path="/usr/bin/spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { execute_no_trans } for pid=16474 comm="procmail" path="/usr/bin/spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { read } for pid=16474 comm="procmail" path="/usr/bin/spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc: denied { read } for pid=16474 comm="procmail" path="/usr/bin/spamc" dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563007.814:8005): arch=c000003e syscall=59 success=yes exit=0 a0=196772e0 a1=196792a0 a2=196791f0 a3=8 items=0 ppid=16473 pid=16474 auid=4294967295 uid=500 gid=501 euid=500 suid=500 fsuid=500 egid=501 sgid=501 fsgid=501 tty=(none) ses=4294967295 comm="spamc" exe="/usr/bin/spamc" subj=system_u:system_r:procmail_t:s0 key=(null) host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563007.814:8005): arch=c000003e syscall=59 success=yes exit=0 a0=196772e0 a1=196792a0 a2=196791f0 a3=8 items=0 ppid=16473 pid=16474 auid=4294967295 uid=500 gid=501 euid=500 suid=500 fsuid=500 egid=501 sgid=501 fsgid=501 tty=(none) ses=4294967295 comm="spamc" exe="/usr/bin/spamc" subj=system_u:system_r:procmail_t:s0 key=(null) Summary SELinux is preventing webalizer (webalizer_t) "search" to ./webalizer (bin_t). Detailed Description [SELinux is in permissive mode, the operation would have been denied but was permitted due to permissive mode.] SELinux denied access requested by webalizer. It is not expected that this access is required by webalizer 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 ./webalizer, restorecon -v './webalizer' 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: root:system_r:webalizer_t:SystemLow-SystemHigh Target Context: system_u:object_r:bin_t Target Objects: ./webalizer [ dir ] Source: webalizer Source Path: /usr/bin/webalizer Port: <Unknown> Host: C5.aardvark.com.au Source RPM Packages: webalizer-2.01_10-30.1 Target RPM Packages: Policy RPM: selinux-policy-2.4.6-203.el5 Selinux Enabled: True Policy Type: targeted MLS Enabled: True Enforcing Mode: Permissive Plugin Name: catchall_file Host Name: C5.aardvark.com.au Platform: Linux C5.aardvark.com.au 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64 x86_64 Alert Count: 119 First Seen: Wed Jan 7 22:00:02 2009 Last Seen: Sat Jan 10 14:00:01 2009 Local ID: fd879861-abb1-4e67-a190-0a721c66dc0e Line Numbers: Raw Audit Messages : host=C5.aardvark.com.au type=AVC msg=audit(1231563601.389:8027): avc: denied { search } for pid=16510 comm="webalizer" name="webalizer" dev=dm-0 ino=32479105 scontext=root:system_r:webalizer_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=dir host=C5.aardvark.com.au type=AVC msg=audit(1231563601.389:8027): avc: denied { search } for pid=16510 comm="webalizer" name="webalizer" dev=dm-0 ino=32479105 scontext=root:system_r:webalizer_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=dir host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563601.389:8027): arch=c000003e syscall=4 success=no exit=-2 a0=4171ee a1=7fff7d310db0 a2=7fff7d310db0 a3=21000 items=0 ppid=16509 pid=16510 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=730 comm="webalizer" exe="/usr/bin/webalizer" subj=root:system_r:webalizer_t:s0-s0:c0.c1023 key=(null) host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563601.389:8027): arch=c000003e syscall=4 success=no exit=-2 a0=4171ee a1=7fff7d310db0 a2=7fff7d310db0 a3=21000 items=0 ppid=16509 pid=16510 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=730 comm="webalizer" exe="/usr/bin/webalizer" subj=root:system_r:webalizer_t:s0-s0:c0.c1023 key=(null) I didn't think I was doing anything unusual here - so I am surprised these aren't covered by standard policy. Am I don't something strange - and if so - do I need to write my own local policy. Is there a more standard way to run spamc and/.or webalizer which will prevent these denials? Thanks Richard.

14 years, 4 months

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Re: Denials from spamc and webalizer on Centos 5.2

by Dominick Grift

Hello, With regard to procmail, i think your policy is missing a domain transition to spamassassin. A custom policy looking something like the following may or may not fix that issue: mkdir ~/myprocmail; cd ~/myprocmail; echo "policy_module(myprocmail, 0.0.1)" > myprocmail.te; echo "require { type procmail_t; }" >> myprocmail.te; echo "optional_policy(`" >> myprocmail.te; echo "spamassassin_domtrans_spamc(procmail_t)" >> myprocmail.te; echo "')" >> myprocmail.te; make -f /usr/share/selinux/devel/Makefile /usr/sbin/semodule -i myprocmail.pp With regard to webalizer it looks like webalizer is searching something in a "bin" directory. If you want you can allow this. mkdir ~/mywebalizer; cd ~mywebalizer; echo "policy_module(mywebalizer, 0.0.1)" > mywebalizer.te; echo "require { type webalizer_t; }" >> mywebalizer.te; echo "corecmd_search_bin(webalizer_t)" >> mywebalizer.te; make -f /usr/share/selinux/devel/Makefile /usr/sbin/semodule -i mywebalizer.pp It may be that both procmail and webalizer domains need more access after this, but you will notice that if this is the case. P.s. You may or may not need to escape some of the characters in my example. Hth, Dominick

14 years, 4 months

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example of a domain with transition policy

by Vadym Chepkov

Hi, Could somebody give me a working example of a policy module with transition, please. I am trying to create a policy for a vendor product I have to use (Asset Insight). The basic idea is to create domains ai_exec_t, ai_t, proper transition rules for initrc_exec_t -> initrc_t -> ai_exec_t -> ai_t. Then I want to ai_t be unconfined (for the moment) so probably make ai_t as an alias of unconfined_t, since there is no "permissive domain" in Redhat5 yet, but I want to be able to see what needs to be added to .te file to make it work. There is no much documentation about writing policy in Redhat/Fedora, unfortunately, or maybe I am missing some. Thank you. Sincerely yours, Vadym Chepkov

14 years, 4 months

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Re: libgpod HAL callout and SELinux denials

by Miroslav Grepl

I will fix the issue with execstack in the next release of selinux policy. F9: selinux-policy-3.3.1-119.fc9 F10: selinux-policy-3.5.13-40.fc10

14 years, 4 months

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Re: SELinux in netbooted images

by Paulo Santos

Hi Eric, No need to apologize :) Looping the list again, sorry for replying directly to you Eric. It was not my intention. Regarding your question: # ls -ltr /selinux/ total 0 -rw-rw-rw- 1 root root 0 Jan 23 09:56 user -rw-rw-rw- 1 root root 0 Jan 23 09:56 relabel -r--r--r-- 1 root root 0 Jan 23 09:56 policyvers crw-rw-rw- 1 root root 1, 3 Jan 23 09:56 null -r--r--r-- 1 root root 0 Jan 23 09:56 mls -rw-rw-rw- 1 root root 0 Jan 23 09:56 member -rw------- 1 root root 0 Jan 23 09:56 load -rw-r--r-- 1 root root 0 Jan 23 09:56 enforce --w------- 1 root root 0 Jan 23 09:56 disable -rw-rw-rw- 1 root root 0 Jan 23 09:56 create -rw-rw-rw- 1 root root 0 Jan 23 09:56 context -rw-r--r-- 1 root root 0 Jan 23 09:56 compat_net --w------- 1 root root 0 Jan 23 09:56 commit_pending_bools -rw-r--r-- 1 root root 0 Jan 23 09:56 checkreqprot dr-xr-xr-x 2 root root 0 Jan 23 09:56 booleans dr-xr-xr-x 2 root root 0 Jan 23 09:56 avc -rw-rw-rw- 1 root root 0 Jan 23 09:56 access Thanks, Paulo On Thu, Jan 29, 2009 at 2:12 PM, Eric Paris <eparis(a)redhat.com> wrote: > On Thu, 2009-01-29 at 09:40 +0100, Paulo Santos wrote: > > Hi all, > > > > Is there any other information i'm able to provide, to help > > troubleshooting this issue ? > > I'm sorry, I totally forgot about this conversation. I apologize. > > Does your image contain an empty /selinux directory to which selinuxfs > can be mounted? Looks like that directory not existing and mount > failing could be a cause for what you are seeing... > > -Eric > >

14 years, 4 months

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eclipse SLIDE question

by Konrad Azzopardi

Hi all, Do not know if someone can help me in this list. I am trying to use SLIDE to write SELinux module. Compilation works but when I try to use semodule to insert the module I get the following error : semodule -i test.pp libsepol.link_modules: Tried to link in a non-MLS module with an MLS base. libsemanage.semanage_link_sandbox: Link packages failed semodule: Failed! It seems to be linked to the fact that while building using checkmodule there is a missing -M. How can I make SLIDE use this -M option ? Many thanks Konrad

14 years, 4 months

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selinux January 2009