Bug 827813
| Summary: | SELinux policy breaks os.path for cobbler | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Pete Travis <me> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 18 | CC: | dominick.grift, dwalsh, hakan_duran, jpazdziora, mgrepl |
| Target Milestone: | --- | Keywords: | Reopened |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.11.1-95.fc18 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-05-21 08:40:29 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
I built and activated a policy module to allow python to read /etc/passwd. Now, python wants to open /etc/passwd, so I add a module for that. cobbler will start, but python still wants getattr access to /etc/password. Following the addition of a module for this, I am able to start cobblerd without denials. Fixed in selinux-policy-3.10.0-129.fc17 selinux-policy-3.10.0-130.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/selinux-policy-3.10.0-130.fc17 Package selinux-policy-3.10.0-130.fc17: * should fix your issue, * was pushed to the Fedora 17 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.10.0-130.fc17' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-9520/selinux-policy-3.10.0-130.fc17 then log in and leave karma (feedback). selinux-policy-3.10.0-130.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report. I have selinux-policy-3.10.0-149.fc17 installed in my box, and I get selinux warning message about /usr/bin/python2.7 attempting getattr access to /etc/passwd. I guess I will build and activate a policy module as described above. Could you execute # semanage permissive -a cobblerd_t re-test it and add your output of # ausearch -m avc -ts recent Thank you. Looks like cobbler needs auth_read_passwd which we have in F18. I see on my F17
allow cobblerd_t passwd_file_t : file { ioctl read getattr lock open } ;
It seems the bug is back on Fedora 18:
# sesearch --allow -s cobblerd_t -t passwd_file_t
Found 1 semantic av rules:
allow cobblerd_t file_type : filesystem getattr ;
# rpm -q cobbler selinux-policy-targeted
cobbler-2.4.0-beta3.fc18.1.noarch
selinux-policy-targeted-3.11.1-92.fc18.noarch
#
avc: denied { read } for pid=2237 comm="cobblerd" name="passwd" dev="dm-1" ino=262820 scontext=system_u:system_r:cobblerd_t:s0 tcontext=system_u:object_r:passwd_file_t:s0 tclass=file
# grep cobbler /var/log/messages | perl -ne 's/^.*\[2237\]: // and print'
Traceback (most recent call last):
File "/usr/lib/python2.7/site.py", line 563, in <module>
main()
File "/usr/lib/python2.7/site.py", line 545, in main
known_paths = addusersitepackages(known_paths)
File "/usr/lib/python2.7/site.py", line 278, in addusersitepackages
user_site = getusersitepackages()
File "/usr/lib/python2.7/site.py", line 253, in getusersitepackages
user_base = getuserbase() # this will also set USER_BASE
File "/usr/lib/python2.7/site.py", line 243, in getuserbase
USER_BASE = get_config_var('userbase')
File "/usr/lib/python2.7/sysconfig.py", line 521, in get_config_var
return get_config_vars().get(name)
File "/usr/lib/python2.7/sysconfig.py", line 425, in get_config_vars
_CONFIG_VARS['userbase'] = _getuserbase()
File "/usr/lib/python2.7/sysconfig.py", line 183, in _getuserbase
return env_base if env_base else joinuser("~", ".local")
File "/usr/lib/python2.7/sysconfig.py", line 169, in joinuser
return os.path.expanduser(os.path.join(*args))
File "/usr/lib/python2.7/posixpath.py", line 260, in expanduser
userhome = pwd.getpwuid(os.getuid()).pw_dir
KeyError: 'getpwuid(): uid not found: 0'
commit a86527976302b41d2484ae2cf15df0904ec1a344
Author: Miroslav Grepl <mgrepl>
Date: Fri May 3 10:19:07 2013 +0200
Allow cobblerd to read /etc/passwd
selinux-policy-3.11.1-94.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/selinux-policy-3.11.1-94.fc18 Package selinux-policy-3.11.1-94.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.11.1-94.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-7743/selinux-policy-3.11.1-94.fc18 then log in and leave karma (feedback). selinux-policy-3.11.1-95.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/selinux-policy-3.11.1-95.fc18 selinux-policy-3.11.1-95.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: On a minimal installation of Fedora 17, cobblerd fails to start. setroubleshoot reports that "SELinux is preventing /usr/bin/python2.7 from read access on the file /etc/passwd" Starting cobblerd directly with `/usr/bin/cobblerd -F` succeeds, but starting the service via systemctl fails. The previous release of Fedora does not have this issue, as /etc/passwd is system_u:object_r:etc_t:s0 . Version-Release number of selected component (if applicable): Name : python Version : 2.7.3 Release : 6.fc17 Name : python-libs Version : 2.7.3 Release : 6.fc17 Name : selinux-policy Version : 3.10.0 Release : 125.fc17 Name : cobbler Version : 2.2.2 Release : 1.fc17 Steps to Reproduce: 1. Configure 'minimal' fedora installation. 2. yum install cobbler 3. yum upgrade 4. systemctl start cobblerd.service Actual results: cobblerd fails to start when selinux blocks cobbler from using os.path Expected results: cobbler is able to call os.path functions without issue Additional info: ## #systemctl status cobblerd.service gives the following: ## [root@athena cobbler]# systemctl status cobblerd.service cobblerd.service - Cobbler Helper Daemon Loaded: loaded (/usr/lib/systemd/system/cobblerd.service; disabled) Active: failed (Result: exit-code) since Sun, 03 Jun 2012 00:29:28 -0600; 16min ago Process: 1492 ExecStart=/usr/bin/cobblerd (code=exited, status=1/FAILURE) CGroup: name=systemd:/system/cobblerd.service [root@athena cobbler]# systemctl status cobblerd.service cobblerd.service - Cobbler Helper Daemon Loaded: loaded (/usr/lib/systemd/system/cobblerd.service; disabled) Active: failed (Result: exit-code) since Sun, 03 Jun 2012 00:29:28 -0600; 22min ago Process: 1492 ExecStart=/usr/bin/cobblerd (code=exited, status=1/FAILURE) CGroup: name=systemd:/system/cobblerd.service Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: File "/usr/lib64/python2.7/sysconfig.py", line 521, in get_config_var Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: return get_config_vars().get(name) Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: File "/usr/lib64/python2.7/sysconfig.py", line 425, in get_config_vars Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: _CONFIG_VARS['userbase'] = _getuserbase() Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: File "/usr/lib64/python2.7/sysconfig.py", line 183, in _getuserbase Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: return env_base if env_base else joinuser("~", ".local") Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: File "/usr/lib64/python2.7/sysconfig.py", line 169, in joinuser Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: return os.path.expanduser(os.path.join(*args)) Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: File "/usr/lib64/python2.7/posixpath.py", line 260, in expanduser Jun 03 00:29:28 athena.petetravis.lan cobblerd[1492]: userhome = pwd.getpwuid(os.getuid()).pw_dir ## #audit.log ## type=AVC msg=audit(1338704944.522:202): avc: denied { read } for pid=1478 comm="cobblerd" name="passwd" dev="dm-1" ino=1574018 scontext=system_u:system_r:cobblerd_t:s0 tcontext=system_u:object_r:passwd_file_t:s0 tclass=file type=SYSCALL msg=audit(1338704944.522:202): arch=c000003e syscall=2 success=no exit=-13 a0=7fe4010fb6ca a1=80000 a2=1b6 a3=238 items=0 ppid=1 pid=1478 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="cobblerd" exe="/usr/bin/python2.7" subj=system_u:system_r:cobblerd_t:s0 key=(null) type=SERVICE_START msg=audit(1338704944.553:203): pid=0 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg=' comm="cobblerd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' type=AVC msg=audit(1338704968.964:204): avc: denied { read } for pid=1492 comm="cobblerd" name="passwd" dev="dm-1" ino=1574018 scontext=system_u:system_r:cobblerd_t:s0 tcontext=system_u:object_r:passwd_file_t:s0 tclass=file type=SYSCALL msg=audit(1338704968.964:204): arch=c000003e syscall=2 success=no exit=-13 a0=7f2efcc496ca a1=80000 a2=1b6 a3=238 items=0 ppid=1 pid=1492 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="cobblerd" exe="/usr/bin/python2.7" subj=system_u:system_r:cobblerd_t:s0 key=(null) type=SERVICE_START msg=audit(1338704968.996:205): pid=0 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg=' comm="cobblerd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed