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Bug 1422000 - SELinux is preventing /usr/bin/certwatch from using the dac_override capability
Summary: SELinux is preventing /usr/bin/certwatch from using the dac_override capability
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
: 1465185 (view as bug list)
Depends On:
Blocks: 1381083 1420851 1486258
TreeView+ depends on / blocked
 
Reported: 2017-02-14 09:55 UTC by Petr Sklenar
Modified: 2021-06-10 11:55 UTC (History)
11 users (show)

Fixed In Version: selinux-policy-3.13.1-170.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1486258 (view as bug list)
Environment:
Last Closed: 2018-04-10 12:26:56 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0763 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2018-04-10 12:08:10 UTC

Description Petr Sklenar 2017-02-14 09:55:54 UTC 
Description of problem:
there are many denial

Version-Release number of selected component (if applicable):
crypto-utils-2.4.1-42.el7.x86_64
selinux-policy-3.13.1-117.el7.noarch

How reproducible:
tried once only

Steps to Reproduce:
1.reboot the machine
2.
3.

Actual results:
/varlog/message:

Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost dbus-daemon: dbus[710]: [system] Activating service name='org.fedoraproject.Setroubleshootd' (using servicehelper)
Feb 13 15:30:02 localhost dbus[710]: [system] Activating service name='org.fedoraproject.Setroubleshootd' (using servicehelper)
Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost certwatch: ObjectStore.cpp(59): Failed to enumerate object store in /var/lib/softhsm/tokens/
Feb 13 15:30:02 localhost certwatch: SoftHSM.cpp(476): Could not load the object store
Feb 13 15:30:02 localhost dbus[710]: [system] Successfully activated service 'org.fedoraproject.Setroubleshootd'
Feb 13 15:30:02 localhost dbus-daemon: dbus[710]: [system] Successfully activated service 'org.fedoraproject.Setroubleshootd'
Feb 13 15:30:03 localhost setroubleshoot: SELinux is preventing /usr/bin/certwatch from using the dac_override capability. For complete SELinux messages. run sealert -l 62b6dfbb-62e0-449b-86df-b073cd038129
Feb 13 15:30:03 localhost python: SELinux is preventing /usr/bin/certwatch from using the dac_override capability.#012#012*****  Plugin dac_override (91.4 confidence) suggests   **********************#012#012If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system#012Then turn on full auditing to get path information about the offending file and generate the error again.#012Do#012#012Turn on full auditing#012# auditctl -w /etc/shadow -p w#012Try to recreate AVC. Then execute#012# ausearch -m avc -ts recent#012If you see PATH record check ownership/permissions on file, and fix it,#012otherwise report as a bugzilla.#012#012*****  Plugin catchall (9.59 confidence) suggests   **************************#012#012If you believe that certwatch should have the dac_override capability by default.#012Then you should report this as a bug.#012You can generate a local policy module to allow this access.#012Do#012allow this access for now by executing:#012# ausearch -c 'certwatch' --raw | audit2allow -M my-certwatch#012# semodule -i my-certwatch.pp#012
Feb 13 15:30:03 localhost setroubleshoot: SELinux is preventing /usr/bin/certwatch from using the dac_override capability. For complete SELinux messages. run sealert -l 62b6dfbb-62e0-449b-86df-b073cd038129


/var/log/audit/audit.log
type=AVC msg=audit(1486996202.302:395): avc:  denied  { dac_override } for  pid=17404 comm="certwatch" capability=1  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1486996202.302:395): avc:  denied  { dac_read_search } for  pid=17404 comm="certwatch" capability=2  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1486996202.303:396): avc:  denied  { dac_override } for  pid=17404 comm="certwatch" capability=1  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1486996202.303:396): avc:  denied  { dac_read_search } for  pid=17404 comm="certwatch" capability=2  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1486996202.327:397): avc:  denied  { dac_override } for  pid=17405 comm="certwatch" capability=1  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1486996202.327:397): avc:  denied  { dac_read_search } for  pid=17405 comm="certwatch" capability=2  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability

Expected results:
no denial?

Additional info:
Comment 1 Milos Malik 2017-02-14 10:02:41 UTC 
Could you paste here the output of following command?

# ls -lR /var/lib/softhsm
Comment 2 Petr Sklenar 2017-02-14 10:18:34 UTC 
[root@localhost ~]# ls -lR /var/lib/softhsm
/var/lib/softhsm:
total 0
drwxrwx---. 2 ods ods 6 Jun 23  2016 tokens

/var/lib/softhsm/tokens:
total 0
Comment 7 Jonathan Larmour 2017-04-26 01:23:47 UTC 
I have also experienced this AVC denial. Based on for example bug 1389945, I ran the following:

auditctl -w /var/lib/softhsm/tokens -p r

I then manually reproduced the problem with:
runcon -t certwatch_t -u system_u -r system_r /etc/cron.daily/certwatch 

After that, running "ausearch -m avc -ts recent" returns:

time->Wed Apr 26 02:05:38 2017
type=PATH msg=audit(1493168738.149:36388): item=0 name="/var/lib/softhsm/tokens/" objtype=UNKNOWN
type=CWD msg=audit(1493168738.149:36388):  cwd="/root"
type=SYSCALL msg=audit(1493168738.149:36388): arch=c000003e syscall=257 success=no exit=-13 a0=ffffffffffffff9c a1=88d358 a2=90800 a3=0 items=1 ppid=6391 pid=6395 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=1 comm="certwatch" exe="/usr/bin/certwatch" subj=system_u:system_r:certwatch_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1493168738.149:36388): avc:  denied  { dac_read_search } for  pid=6395 comm="certwatch" capability=2  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1493168738.149:36388): avc:  denied  { dac_override } for  pid=6395 comm="certwatch" capability=1  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
----
time->Wed Apr 26 02:05:38 2017
type=PATH msg=audit(1493168738.150:36389): item=0 name="/var/lib/softhsm/tokens/" objtype=UNKNOWN
type=CWD msg=audit(1493168738.150:36389):  cwd="/root"
type=SYSCALL msg=audit(1493168738.150:36389): arch=c000003e syscall=257 success=no exit=-13 a0=ffffffffffffff9c a1=88d318 a2=90800 a3=0 items=1 ppid=6391 pid=6395 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=1 comm="certwatch" exe="/usr/bin/certwatch" subj=system_u:system_r:certwatch_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1493168738.150:36389): avc:  denied  { dac_read_search } for  pid=6395 comm="certwatch" capability=2  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
type=AVC msg=audit(1493168738.150:36389): avc:  denied  { dac_override } for  pid=6395 comm="certwatch" capability=1  scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tclass=capability
----

(and more)
Perhaps this info will be useful for those with more selinux-fu than I.

Jifl
Comment 8 Lukas Vrabec 2017-06-27 10:57:10 UTC 
*** Bug 1465185 has been marked as a duplicate of this bug. ***
Comment 12 errata-xmlrpc 2018-04-10 12:26:56 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0763
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