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Bug 1671019

Summary:	Selinux AVC for /var/run/faillock/
Product:	Red Hat Enterprise Linux 8	Reporter:	philippe Maupertuis <philippe.maupertuis>
Component:	selinux-policy	Assignee:	Zdenek Pytela <zpytela>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	8.1	CC:	jjaburek, lvrabec, mmalik, philippe.maupertuis, plautrba, ssekidde, zpytela
Target Milestone:	rc	Keywords:	Patch
Target Release:	8.2	Flags:	pm-rhel: mirror+
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-28 16:40:34 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:
Bug Depends On:	1673107, 1682526
Bug Blocks:

Description philippe Maupertuis 2019-01-30 15:05:35 UTC

Description of problem:
At 23:16:07 01/25/2019 system, acting as root, unsuccessfully accessed-mac-policy-controlled-object /var/run/faillock/ using /usr/lib/systemd/systemd
At 16:52:02 01/29/2019 system, acting as root, unsuccessfully accessed-mac-policy-controlled-object /var/run/faillock/fr18358 using /usr/libexec/cockpit-session

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


How reproducible:


Steps to Reproduce:
1. Set up a rehl8 beta 1
2. Login with wrong password
3. Login successfully and launch cockpit

Actual results:
SELINUX AVC

Expected results:
Access granted

Additional info:

Comment 1 Milos Malik 2019-01-30 15:22:17 UTC

Please attach SELinux denials which appeared on your machine:

# ausearch -m avc -m user_avc -m selinux_err -m user_selinux_err -i -ts today

Thank you.

Comment 2 philippe Maupertuis 2019-01-30 19:06:56 UTC

Please find below the result of the command:
ausearch -m avc -m user_avc -m selinux_err -m user_selinux_err -i
----
type=PROCTITLE msg=audit(01/25/2019 23:16:07.157:347) : proctitle=(systemd)
type=PATH msg=audit(01/25/2019 23:16:07.157:347) : item=0 name=/var/run/faillock/ inode=24723 dev=00:17 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/25/2019 23:16:07.157:347) : cwd=/
type=SYSCALL msg=audit(01/25/2019 23:16:07.157:347) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x5626afa30f50 a2=O_RDWR|O_CREAT a3=0x180 items=1 ppid=1 pid=1988 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=(systemd) exe=/usr/lib/systemd/systemd subj=system_u:system_r:init_t:s0 key=logins
type=AVC msg=audit(01/25/2019 23:16:07.157:347) : avc:  denied  { write } for  pid=1988 comm=(systemd) name=faillock dev="tmpfs" ino=24723 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=0
----
type=PROCTITLE msg=audit(01/26/2019 00:39:07.829:283) : proctitle=(systemd)
type=PATH msg=audit(01/26/2019 00:39:07.829:283) : item=0 name=/var/run/faillock/ inode=24326 dev=00:17 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/26/2019 00:39:07.829:283) : cwd=/
type=SYSCALL msg=audit(01/26/2019 00:39:07.829:283) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x5617a91fce20 a2=O_RDWR|O_CREAT a3=0x180 items=1 ppid=1 pid=1166 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=(systemd) exe=/usr/lib/systemd/systemd subj=system_u:system_r:init_t:s0 key=logins
type=AVC msg=audit(01/26/2019 00:39:07.829:283) : avc:  denied  { write } for  pid=1166 comm=(systemd) name=faillock dev="tmpfs" ino=24326 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=0
----
type=PROCTITLE msg=audit(01/29/2019 13:38:31.856:299) : proctitle=(systemd)
type=PATH msg=audit(01/29/2019 13:38:31.856:299) : item=0 name=/var/run/faillock/ inode=24359 dev=00:17 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/29/2019 13:38:31.856:299) : cwd=/
type=SYSCALL msg=audit(01/29/2019 13:38:31.856:299) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x5599122f1d60 a2=O_RDWR|O_CREAT a3=0x180 items=1 ppid=1 pid=1295 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=(systemd) exe=/usr/lib/systemd/systemd subj=system_u:system_r:init_t:s0 key=logins
type=AVC msg=audit(01/29/2019 13:38:31.856:299) : avc:  denied  { write } for  pid=1295 comm=(systemd) name=faillock dev="tmpfs" ino=24359 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:faillog_t:s0 tclass=dir permissive=0
----
type=PROCTITLE msg=audit(01/29/2019 16:52:02.528:1190) : proctitle=/usr/libexec/cockpit-session localhost
type=PATH msg=audit(01/29/2019 16:52:02.528:1190) : item=0 name=/var/run/faillock/fr18358 inode=46444 dev=00:17 mode=file,600 ouid=fr18358 ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/29/2019 16:52:02.528:1190) : cwd=/
type=SYSCALL msg=audit(01/29/2019 16:52:02.528:1190) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x557cf58824a0 a2=O_RDWR a3=0x0 items=1 ppid=5892 pid=5912 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=cockpit-session exe=/usr/libexec/cockpit-session subj=system_u:system_r:cockpit_session_t:s0 key=logins 
type=AVC msg=audit(01/29/2019 16:52:02.528:1190) : avc:  denied  { dac_override } for  pid=5912 comm=cockpit-session capability=dac_override  scontext=system_u:system_r:cockpit_session_t:s0 tcontext=system_u:system_r:cockpit_session_t:s0 tclass=capability permissive=0
----
type=PROCTITLE msg=audit(01/29/2019 16:52:02.558:1192) : proctitle=/usr/libexec/cockpit-session localhost
type=PATH msg=audit(01/29/2019 16:52:02.558:1192) : item=0 name=/var/run/faillock/fr18358 inode=46444 dev=00:17 mode=file,600 ouid=fr18358 ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/29/2019 16:52:02.558:1192) : cwd=/
type=SYSCALL msg=audit(01/29/2019 16:52:02.558:1192) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x557cf5885990 a2=O_RDWR a3=0x0 items=1 ppid=5892 pid=5912 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=cockpit-session exe=/usr/libexec/cockpit-session subj=system_u:system_r:cockpit_session_t:s0 key=logins 
type=AVC msg=audit(01/29/2019 16:52:02.558:1192) : avc:  denied  { dac_override } for  pid=5912 comm=cockpit-session capability=dac_override  scontext=system_u:system_r:cockpit_session_t:s0 tcontext=system_u:system_r:cockpit_session_t:s0 tclass=capability permissive=0
----

Comment 14 Zdenek Pytela 2019-12-09 15:15:32 UTC

In this audit record:
----
type=PROCTITLE msg=audit(01/29/2019 16:52:02.558:1192) : proctitle=/usr/libexec/cockpit-session localhost
type=PATH msg=audit(01/29/2019 16:52:02.558:1192) : item=0 name=/var/run/faillock/fr18358 inode=46444 dev=00:17 mode=file,600 ouid=fr18358 ogid=root rdev=00:00 obj=system_u:object_r:faillog_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(01/29/2019 16:52:02.558:1192) : cwd=/
type=SYSCALL msg=audit(01/29/2019 16:52:02.558:1192) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x557cf5885990 a2=O_RDWR a3=0x0 items=1 ppid=5892 pid=5912 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=cockpit-session exe=/usr/libexec/cockpit-session subj=system_u:system_r:cockpit_session_t:s0 key=logins 
type=AVC msg=audit(01/29/2019 16:52:02.558:1192) : avc:  denied  { dac_override } for  pid=5912 comm=cockpit-session capability=dac_override  scontext=system_u:system_r:cockpit_session_t:s0 tcontext=system_u:system_r:cockpit_session_t:s0 tclass=capability permissive=0
----

it is reported the /var/run/faillock/fr18358 file is owned by user fr18358 and has mode 0600, but the cockpit session runs under user root. I suppose it should be fixed in faillog or cockpit. One of the options is mode 640 as the file's group is set to root.

Comment 22 errata-xmlrpc 2020-04-28 16:40:34 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-2020:1773