selinux February 2008

selinux@lists.fedoraproject.org

34 participants
61 discussions

SELinux is preventing plugin-config (nsplugin_config_t) "execstack" to <Unknown> (nsplugin_config_t)
by Antonio Olivares 27 Feb '08

27 Feb '08

Ok Seamonkey and selinux, firefox, and nsplugin. Here are the results. Thanks for your suggestions and advice in advance. Antonio Summary: SELinux is preventing plugin-config (nsplugin_config_t) "execstack" to <Unknown> (nsplugin_config_t). Detailed Description: SELinux denied access requested by plugin-config. It is not expected that this access is required by plugin-config 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 unconfined_u:unconfined_r:nsplugin_config_t :SystemLow-SystemHigh Target Context unconfined_u:unconfined_r:nsplugin_config_t :SystemLow-SystemHigh Target Objects None [ process ] Source plugin-config Source Path /usr/lib/nspluginwrapper/plugin-config Port <Unknown> Host localhost Source RPM Packages nspluginwrapper-0.9.91.5-22.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.0-1.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name localhost Platform Linux localhost 2.6.25-0.65.rc2.git7.fc9 #1 SMP Sat Feb 23 23:06:09 EST 2008 i686 athlon Alert Count 2 First Seen Tue 26 Feb 2008 03:17:23 PM CST Last Seen Tue 26 Feb 2008 03:22:56 PM CST Local ID 276820c9-9871-4632-8ec1-c8909c8d7c0b Line Numbers Raw Audit Messages host=localhost type=AVC msg=audit(1204060976.98:110): avc: denied { execstack } for pid=20500 comm="plugin-config" scontext=unconfined_u:unconfined_r:nsplugin_config_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:nsplugin_config_t:s0-s0:c0.c1023 tclass=process host=localhost type=SYSCALL msg=audit(1204060976.98:110): arch=40000003 syscall=125 success=no exit=-13 a0=bf957000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=20498 pid=20500 auid=500 uid=500 gid=500 euid=0 suid=0 fsuid=0 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="plugin-config" exe="/usr/lib/nspluginwrapper/plugin-config" subj=unconfined_u:unconfined_r:nsplugin_config_t:s0-s0:c0.c1023 key=(null) ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

2 1

SELinux is preventing seamonkey-bin from making the program stack executable.
by Antonio Olivares 27 Feb '08

27 Feb '08

Dear all, After applying the fix suggested by Mr. Walsh, [root@localhost ~]# setsebool -P allow_unconfined_nsplugin_transition=1 allow_nsplugin_execmem=1 [root@localhost ~]# getsebool -a | grep nsp allow_nsplugin_execmem --> on allow_unconfined_nsplugin_transition --> on Seamonkey is asking permission for the stack. I do not want to allow access if it is not correct for seamonkey to allow stack execution. Please help me nail this one as well and crossing my fingers that firefox/minefield does not ask as well. Summary: SELinux is preventing seamonkey-bin from making the program stack executable. Detailed Description: The seamonkey-bin application attempted to make its stack executable. This is a potential security problem. This should never ever be necessary. Stack memory is not executable on most OSes these days and this will not change. Executable stack memory is one of the biggest security problems. An execstack error might in fact be most likely raised by malicious code. Applications are sometimes coded incorrectly and request this permission. The SELinux Memory Protection Tests (http://people.redhat.com/drepper/selinux-mem.html) web page explains how to remove this requirement. If seamonkey-bin does not work and you need it to work, you can configure SELinux temporarily to allow this access until the application is fixed. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Allowing Access: Sometimes a library is accidentally marked with the execstack flag, if you find a library with this flag you can clear it with the execstack -c LIBRARY_PATH. Then retry your application. If the app continues to not work, you can turn the flag back on with execstack -s LIBRARY_PATH. Otherwise, if you trust seamonkey-bin to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin'" You must also change the default file context files on the system in order to preserve them even on a full relabel. "semanage fcontext -a -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin' Additional Information: Source Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Objects None [ process ] Source firefox Source Path /usr/lib/firefox-3.0b3pre/firefox Port <Unknown> Host localhost Source RPM Packages seamonkey-1.1.8-4.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.0-1.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execstack Host Name localhost Platform Linux localhost 2.6.25-0.65.rc2.git7.fc9 #1 SMP Sat Feb 23 23:06:09 EST 2008 i686 athlon Alert Count 140 First Seen Fri 01 Feb 2008 05:08:54 PM CST Last Seen Tue 26 Feb 2008 03:17:04 PM CST Local ID c4806f30-a6dc-43b0-8901-5531075795f7 Line Numbers Raw Audit Messages host=localhost type=AVC msg=audit(1204060624.602:108): avc: denied { execstack } for pid=20290 comm="seamonkey-bin" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process host=localhost type=SYSCALL msg=audit(1204060624.602:108): arch=40000003 syscall=125 success=no exit=-13 a0=bfc72000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=1 pid=20290 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="seamonkey-bin" exe="/usr/lib/seamonkey-1.1.8/seamonkey-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping

2 1

VOIP policy
by max 27 Feb '08

27 Feb '08

Do current SELinux policies support VoIP (internet telephony)? Thanks, Max

2 1

SELinux is preventing npviewer.bin (nsplugin_t) "search" to ./pcm (alsa_etc_rw_t)
by Antonio Olivares 27 Feb '08

27 Feb '08

What is npviewr? What does it do? Setroubleshoot reports that it is causing trouble: Summary: SELinux is preventing npviewer.bin (nsplugin_t) "search" to ./pcm (alsa_etc_rw_t). Detailed Description: SELinux denied access requested by npviewer.bin. It is not expected that this access is required by npviewer.bin 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 ./pcm, restorecon -v './pcm' 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 unconfined_u:unconfined_r:nsplugin_t:SystemLow- SystemHigh Target Context system_u:object_r:alsa_etc_rw_t Target Objects ./pcm [ dir ] Source npviewer.bin Source Path /usr/lib/nspluginwrapper/npviewer.bin Port <Unknown> Host localhost Source RPM Packages nspluginwrapper-0.9.91.5-22.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.0-1.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall_file Host Name localhost Platform Linux localhost 2.6.25-0.65.rc2.git7.fc9 #1 SMP Sat Feb 23 23:06:09 EST 2008 i686 athlon Alert Count 1 First Seen Tue 26 Feb 2008 03:24:34 PM CST Last Seen Tue 26 Feb 2008 03:24:34 PM CST Local ID 21b2a4d1-ec93-4670-a34e-841d82827177 Line Numbers Raw Audit Messages host=localhost type=AVC msg=audit(1204061074.835:111): avc: denied { search } for pid=20571 comm="npviewer.bin" name="pcm" dev=dm-0 ino=28344759 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:alsa_etc_rw_t:s0 tclass=dir host=localhost type=SYSCALL msg=audit(1204061074.835:111): arch=40000003 syscall=5 success=no exit=-13 a0=906d258 a1=0 a2=1b6 a3=0 items=0 ppid=20512 pid=20571 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="npviewer.bin" exe="/usr/lib/nspluginwrapper/npviewer.bin" subj=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 key=(null) Regards, Antonio ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

2 1

Polyinstantiation that allows group access
by Forrest Taylor 26 Feb '08

26 Feb '08

Is there any way to allow polyinstantiation to give the same view to a number of users? For example, I want to give users in the adm group access to the same shared /tmp (really /tmp-adm) directory, users in the wheel group access to a different shared /tmp (really /tmp-wheel), and all other users access to their own individual /tmp. Is this possible? Of course, the more I think about this, the more I see reasons not to do it such as conflicts--what if a user were in the adm and wheel groups? For a single group, I can see excluding them from the polyinstantiated directory entirely, but with several groups I cannot think of a way to safely do this. Thoughts? Thanks, Forrest

2 2

User web pages in the strict policy
by Forrest Taylor 26 Feb '08

26 Feb '08

I am using RHEL5.1 with selinux-policy-strict-2.4.6-106.el5_1.3. Users in user_r or staff_r cannot see the public_html directory nor it's content using the strict policy. The public_html directory gets httpd_user_content_t or httpd_staff_content_t. I was expecting to be able to view my own content, but I cannot. `ls -Z` shows that I cannot view the permission or context. Is this expected behavior? If so, what is the logic behind it? Thanks, Forrest 1.

1 0

Changing policies, using enforcing=0 the first time
by Forrest Taylor 26 Feb '08

26 Feb '08

I am running into a strange occurrence running RHEL5.1 with an updated policy (2.4.6-106.el5_1.3). By default, it runs the targeted policy. I install the mls and the strict policy and touch /.autorelabel. The first time that I boot to one of these other policies, I get a kernel panic, and I have to use enforcing=0. The strange thing is that I can then go back and forth between any policy without setting permissive mode--that is, I only have to set enforcing=0 the first time that I make a policy change, but subsequent times it is not required. Does fixfiles change something the first time that allows the relabel to work subsequent times in enforcing mode? Any thoughts? Thanks, Forrest

3 6

excessively verbose policy
by Bill Nottingham 26 Feb '08

26 Feb '08

I was writing policy today, and I couldn't help notice a lot of repetitiveness in our policy: libs_use_ld_so(...) libs_use_shared_libs(...) These are needed by, well, everything. Can't they be assumed-unless-denied? Similarly, 99% of confined apps need: miscfiles_read_localization() files_read_etc_files(.) pipes & stream sockets Is there a way to streamline policy so there is a lot less repetition? Bill

4 4

SELinux is preventing plugin-config from making the program stack executable/seamonkey
by Antonio Olivares 26 Feb '08

26 Feb '08

Dear all, I have changed the stack to allow firefox to use the stack, then I reverted. I read Jim's exchange with Mr. Dan Walsh and there it was mentioned about nspluginwrapper. I installed it and I see the following every time I start firefox/seamonkey. I have avoided to do anything because I am not sure what to do. One side of me tells me to do what setroubleshoot tells me, the other tells me to ask for advice as to which is the best way to proceed and fix this issue(s) for good. I leave it in the hands of the people that know best and follow your guidance carefully. TIA, Antonio Summary: SELinux is preventing plugin-config from making the program stack executable. Detailed Description: The plugin-config application attempted to make its stack executable. This is a potential security problem. This should never ever be necessary. Stack memory is not executable on most OSes these days and this will not change. Executable stack memory is one of the biggest security problems. An execstack error might in fact be most likely raised by malicious code. Applications are sometimes coded incorrectly and request this permission. The SELinux Memory Protection Tests (http://people.redhat.com/drepper/selinux-mem.html) web page explains how to remove this requirement. If plugin-config does not work and you need it to work, you can configure SELinux temporarily to allow this access until the application is fixed. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Allowing Access: Sometimes a library is accidentally marked with the execstack flag, if you find a library with this flag you can clear it with the execstack -c LIBRARY_PATH. Then retry your application. If the app continues to not work, you can turn the flag back on with execstack -s LIBRARY_PATH. Otherwise, if you trust plugin-config to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/lib/nspluginwrapper/plugin-config'" You must also change the default file context files on the system in order to preserve them even on a full relabel. "semanage fcontext -a -t unconfined_execmem_exec_t '/usr/lib/nspluginwrapper/plugin-config'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/lib/nspluginwrapper/plugin-config' Additional Information: Source Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Objects None [ process ] Source firefox Source Path /usr/lib/firefox-3.0b3pre/firefox Port <Unknown> Host localhost Source RPM Packages nspluginwrapper-0.9.91.5-22.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.0-1.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execstack Host Name localhost Platform Linux localhost 2.6.25-0.65.rc2.git7.fc9 #1 SMP Sat Feb 23 23:06:09 EST 2008 i686 athlon Alert Count 133 First Seen Fri 01 Feb 2008 05:08:54 PM CST Last Seen Tue 26 Feb 2008 06:55:45 AM CST Local ID c4806f30-a6dc-43b0-8901-5531075795f7 Line Numbers Raw Audit Messages host=localhost type=AVC msg=audit(1204030545.936:22): avc: denied { execstack } for pid=2959 comm="plugin-config" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process host=localhost type=SYSCALL msg=audit(1204030545.936:22): arch=40000003 syscall=125 success=no exit=-13 a0=bfbc9000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=2957 pid=2959 auid=500 uid=500 gid=500 euid=0 suid=0 fsuid=0 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="plugin-config" exe="/usr/lib/nspluginwrapper/plugin-config" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) **** end of nspluginwrapper ****** **** start of seamonkey setroubleshoot message *** Summary: SELinux is preventing seamonkey-bin from making the program stack executable. Detailed Description: The seamonkey-bin application attempted to make its stack executable. This is a potential security problem. This should never ever be necessary. Stack memory is not executable on most OSes these days and this will not change. Executable stack memory is one of the biggest security problems. An execstack error might in fact be most likely raised by malicious code. Applications are sometimes coded incorrectly and request this permission. The SELinux Memory Protection Tests (http://people.redhat.com/drepper/selinux-mem.html) web page explains how to remove this requirement. If seamonkey-bin does not work and you need it to work, you can configure SELinux temporarily to allow this access until the application is fixed. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Allowing Access: Sometimes a library is accidentally marked with the execstack flag, if you find a library with this flag you can clear it with the execstack -c LIBRARY_PATH. Then retry your application. If the app continues to not work, you can turn the flag back on with execstack -s LIBRARY_PATH. Otherwise, if you trust seamonkey-bin to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin'" You must also change the default file context files on the system in order to preserve them even on a full relabel. "semanage fcontext -a -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/lib/seamonkey-1.1.8/seamonkey-bin' Additional Information: Source Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Context unconfined_u:unconfined_r:unconfined_t:SystemLow- SystemHigh Target Objects None [ process ] Source firefox Source Path /usr/lib/firefox-3.0b3pre/firefox Port <Unknown> Host localhost Source RPM Packages seamonkey-1.1.8-4.fc9 Target RPM Packages Policy RPM selinux-policy-3.3.0-1.fc9 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execstack Host Name localhost Platform Linux localhost 2.6.25-0.65.rc2.git7.fc9 #1 SMP Sat Feb 23 23:06:09 EST 2008 i686 athlon Alert Count 135 First Seen Fri 01 Feb 2008 05:08:54 PM CST Last Seen Tue 26 Feb 2008 07:24:52 AM CST Local ID c4806f30-a6dc-43b0-8901-5531075795f7 Line Numbers Raw Audit Messages host=localhost type=AVC msg=audit(1204032292.58:34): avc: denied { execstack } for pid=4524 comm="seamonkey-bin" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process host=localhost type=SYSCALL msg=audit(1204032292.58:34): arch=40000003 syscall=125 success=no exit=-13 a0=bfa5e000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=1 pid=4524 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="seamonkey-bin" exe="/usr/lib/seamonkey-1.1.8/seamonkey-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) ***** end of seamonkey ***** ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

1 0

SA problem, selinux seems to be killing spamassassin
by Gene Heskett 25 Feb '08

25 Feb '08

Greetings; I get home tonight with the spam going wild, so I restart spamassassin, and get another copy of this: Summary: SELinux is preventing spamd(/usr/bin/perl) (spamd_t) "kill" to <Unknown> (spamd_t). Detailed Description: SELinux denied access requested by spamd(/usr/bin/perl). It is not expected that this access is required by spamd(/usr/bin/perl) 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:spamd_t:s0 Target Context system_u:system_r:spamd_t:s0 Target Objects None [ capability ] Source spamd(/usr/bin/perl) Port <Unknown> Host coyote.coyote.den Source RPM Packages Target RPM Packages Policy RPM selinux-policy-3.0.8-84.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name coyote.coyote.den Platform Linux coyote.coyote.den 2.6.24 #1 SMP PREEMPT Sun Feb 10 20:51:31 EST 2008 i686 athlon Alert Count 10 First Seen Wed 20 Feb 2008 09:36:02 PM EST Last Seen Mon 25 Feb 2008 10:51:32 PM EST Local ID 6d119b1a-2693-43cf-b27b-f4c2d8339623 Line Numbers Raw Audit Messages host=coyote.coyote.den type=AVC msg=audit(1203997892.182:2127): avc: denied { kill } for pid=5699 comm="spamd" capability=5 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:system_r:spamd_t:s0 tclass=capability host=coyote.coyote.den type=SYSCALL msg=audit(1203997892.182:2127): arch=40000003 syscall=37 success=no exit=-1 a0=3f42 a1=2 a2=4af5f5cc a3=80775a8 items=0 ppid=1 pid=5699 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) comm="spamd" exe="/usr/bin/perl" subj=system_u:system_r:spamd_t:s0 key=(null) ===================== So there's the bug report. What can I do? -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) "Hi, I'm Professor Alan Ginsburg... But you can call me... Captain Toke." -- John Lovitz, as ex-Supreme Court nominee Alan Ginsburg, on SNL

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selinux February 2008