Bug 1577156 - oddjob-mkhomedir can not create .bash_profile because AVC:dac_override
Summary: oddjob-mkhomedir can not create .bash_profile because AVC:dac_override
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 28
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Lukas Vrabec
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2018-05-11 10:58 UTC by Patrik Kis
Modified: 2018-05-11 11:59 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Last Closed: 2018-05-11 11:59:39 UTC
Type: Bug

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Description Patrik Kis 2018-05-11 10:58:16 UTC
Description of problem:
When oddjob-mkhomedir tries to cretate .bash_profile for a remote user, it is not allowed by selinux-policy. 

May 11 06:46:23 qeos-21.ad.baseos.qe oddjob-mkhomedir[20980]: error creating /home/amy@ad.baseos.qe/.bash_profile: Permission denied

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Start oddjob-mkhomedir service
2. Confugure the system to use remote accounts (e.g. IPA)
3. Login as a remote user, which has no local home directory.

Actual results:
type=PROCTITLE msg=audit(05/11/2018 06:46:23.054:1039) : proctitle=mkhomedir 
type=SYSCALL msg=audit(05/11/2018 06:46:23.054:1039) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x7ffea9cfe5b0 a2=O_WRONLY|O_CREAT|O_EXCL a3=0x8180 items=0 ppid=5235 pid=20980 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=mkhomedir exe=/usr/libexec/oddjob/mkhomedir subj=system_u:system_r:oddjob_mkhomedir_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(05/11/2018 06:46:23.054:1039) : avc:  denied  { dac_override } for  pid=20980 comm=mkhomedir capability=dac_override  scontext=system_u:system_r:oddjob_mkhomedir_t:s0-s0:c0.c1023 tcontext=system_u:system_r:oddjob_mkhomedir_t:s0-s0:c0.c1023 tclass=capability permissive=0

Comment 1 Patrik Kis 2018-05-11 11:59:39 UTC
Looks like this was already fixed in selinux-policy-3.14.1-24.fc28.
 sesearch -A -s oddjob_mkhomedir_t -t oddjob_mkhomedir_t -c capability
allow oddjob_mkhomedir_t oddjob_mkhomedir_t:capability { chown dac_override dac_read_search fowner fsetid };

Closing the case. Sorry for the noise.

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