Bug 867107
| Summary: | SELinux is preventing /usr/sbin/in.tftpd from using the 'dac_override' capabilities. | ||||||||
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| Product: | [Fedora] Fedora | Reporter: | manul.sob | ||||||
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
| Severity: | unspecified | Docs Contact: | |||||||
| Priority: | unspecified | ||||||||
| Version: | 17 | CC: | dominick.grift, dwalsh, mgrepl | ||||||
| Target Milestone: | --- | Keywords: | Reopened | ||||||
| Target Release: | --- | ||||||||
| Hardware: | x86_64 | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | abrt_hash:57a06aff2fd856e9347146bae233bd6b33bf6954ae936cef5a3161b1e0273684 | ||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2012-12-20 15:41:05 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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Created attachment 628337 [details]
File: type
Created attachment 628338 [details]
File: hashmarkername
Could you do these steps Turn on full auditing # auditctl -w /etc/shadow -p w Try to recreate AVC. Then execute # ausearch -m avc -ts recent Thanks for the quick reply.
It shows me this:
----
time->Wed Oct 17 12:52:41 2012
type=PATH msg=audit(1350474761.252:78): item=0 name="/home/ms/tftp"
type=CWD msg=audit(1350474761.252:78): cwd="/"
type=SYSCALL msg=audit(1350474761.252:78): arch=c000003e syscall=80 success=no exit=-13 a0=7fff218f3f1c a1=2023198 a2=4 a3=10 items=1 ppid=629 pid=1380 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="in.tftpd" exe="/usr/sbin/in.tftpd" subj=system_u:system_r:tftpd_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1350474761.252:78): avc: denied { dac_read_search } for pid=1380 comm="in.tftpd" capability=2 scontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1350474761.252:78): avc: denied { dac_override } for pid=1380 comm="in.tftpd" capability=1 scontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tclass=capability
It looks we should have also tunable_policy(`tftp_home_dir',` boolean. We have tunable_policy(`ftp_home_dir',` I am sorry, i am not a linux expert, can you explain me what I should do? Thanks. As root execute # setsebool -P tftp_home_dir 1 And you should be all set. Thanks for the reply. The command didn't work. # setsebool -P /home/ms/tftp 1 libsemanage.dbase_llist_set: record not found in the database (No such file or directory). libsemanage.dbase_llist_set: could not set record value (No such file or directory). Could not change boolean /home/ms/tftp Could not change policy booleans We need to add tftp_home_dir Added.
commit 73835352c5459d69ff14a6460f55f41e2ce78805
Author: Miroslav Grepl <mgrepl>
Date: Fri Oct 19 11:57:21 2012 +0200
Add tftp_homedir boolean
selinux-policy-3.10.0-159.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/selinux-policy-3.10.0-159.fc17 Package selinux-policy-3.10.0-159.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-3.10.0-159.fc17' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-17782/selinux-policy-3.10.0-159.fc17 then log in and leave karma (feedback). selinux-policy-3.10.0-159.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: I was using a tftp server and i want to write in /home/ms/tftp but selinux doesn't allow. Additional info: libreport version: 2.0.14 kernel: 3.6.1-1.fc17.x86_64 description: :SELinux is preventing /usr/sbin/in.tftpd from using the 'dac_override' capabilities. : :***** Plugin dac_override (91.4 confidence) suggests *********************** : :If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system :Then turn on full auditing to get path information about the offending file and generate the error again. :Do : :Turn on full auditing :# auditctl -w /etc/shadow -p w :Try to recreate AVC. Then execute :# ausearch -m avc -ts recent :If you see PATH record check ownership/permissions on file, and fix it, :otherwise report as a bugzilla. : :***** Plugin catchall (9.59 confidence) suggests *************************** : :If you believe that in.tftpd should have the dac_override capability by default. :Then you should report this as a bug. :You can generate a local policy module to allow this access. :Do :allow this access for now by executing: :# grep in.tftpd /var/log/audit/audit.log | audit2allow -M mypol :# semodule -i mypol.pp : :Additional Information: :Source Context system_u:system_r:tftpd_t:s0-s0:c0.c1023 :Target Context system_u:system_r:tftpd_t:s0-s0:c0.c1023 :Target Objects [ capability ] :Source in.tftpd :Source Path /usr/sbin/in.tftpd :Port <Unknown> :Host (removed) :Source RPM Packages tftp-server-5.2-2.fc17.x86_64 :Target RPM Packages :Policy RPM selinux-policy-3.10.0-153.fc17.noarch :Selinux Enabled True :Policy Type targeted :Enforcing Mode Enforcing :Host Name (removed) :Platform Linux (removed) 3.6.1-1.fc17.x86_64 #1 SMP Wed Oct : 10 12:13:05 UTC 2012 x86_64 x86_64 :Alert Count 1 :First Seen 2012-10-16 20:18:02 WEST :Last Seen 2012-10-16 20:18:02 WEST :Local ID 79b7da3c-389a-4ccb-ab88-1d3c841c6368 : :Raw Audit Messages :type=AVC msg=audit(1350415082.134:68): avc: denied { dac_override } for pid=1256 comm="in.tftpd" capability=1 scontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tclass=capability : : :type=AVC msg=audit(1350415082.134:68): avc: denied { dac_read_search } for pid=1256 comm="in.tftpd" capability=2 scontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:tftpd_t:s0-s0:c0.c1023 tclass=capability : : :type=SYSCALL msg=audit(1350415082.134:68): arch=x86_64 syscall=chdir success=no exit=EACCES a0=7fffbd4f8f1c a1=2062198 a2=4 a3=10 items=0 ppid=574 pid=1256 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=in.tftpd exe=/usr/sbin/in.tftpd subj=system_u:system_r:tftpd_t:s0-s0:c0.c1023 key=(null) : :Hash: in.tftpd,tftpd_t,tftpd_t,capability,dac_override : :audit2allow : :#============= tftpd_t ============== :allow tftpd_t self:capability { dac_read_search dac_override }; : :audit2allow -R : :#============= tftpd_t ============== :allow tftpd_t self:capability { dac_read_search dac_override }; :