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Bug 1853389 - fetchmail cannot remove stale /var/spool/mail/.fetchmail.pid file
Summary: fetchmail cannot remove stale /var/spool/mail/.fetchmail.pid file
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.3
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: 8.4
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-07-02 14:35 UTC by Milos Malik
Modified: 2021-05-18 14:58 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of: 1840880
Environment:
Last Closed: 2021-05-18 14:57:37 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Milos Malik 2020-07-02 14:35:39 UTC 
+++ This bug was initially created as a clone of Bug #1840880 +++

Description of problem:

fetchmail is not started at boot if it finds /var/spool/mail/.fetchmail.pid.

May 27 09:36:36 alpha audit[977]: AVC avc:  denied  { unlink } for  pid=977 comm="fetchmail" name=".fetchmail.pid" dev="dm-0" ino=393547 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0
May 27 09:36:36 alpha audit[977]: AVC avc:  denied  { write } for  pid=977 comm="fetchmail" name=".fetchmail.pid" dev="dm-0" ino=393547 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0
May 27 09:36:36 alpha fetchmail[977]: fetchmail: removing stale lockfile
May 27 09:36:36 alpha fetchmail[977]: /var/spool/mail/.fetchmail.pid: Permission denied
May 27 09:36:36 alpha fetchmail[977]: /var/spool/mail/.fetchmail.pid: Permission denied
May 27 09:36:36 alpha systemd[1]: fetchmail.service: Main process exited, code=exited, status=8/n/a
May 27 09:36:36 alpha systemd[1]: fetchmail.service: Failed with result 'exit-code'.
May 27 09:36:36 alpha audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=fetchmail comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'


Version-Release number of selected component (if applicable):
fetchmail-6.3.26-19.el8.x86_64
selinux-policy-3.14.3-48.el8.noarch
selinux-policy-targeted-3.14.3-48.el8.noarch

How reproducible:

Whenever /var/spool/mail/.fetchmail.pid is left behind.

--- Additional comment from Milos Malik on 2020-05-28 09:34:13 UTC ---

The .fetchmail.pid file is created with a different context than what is expected by restorecon.

# service fetchmail start
Redirecting to /bin/systemctl start fetchmail.service
# service fetchmail status
Redirecting to /bin/systemctl status fetchmail.service
● fetchmail.service - A remote-mail retrieval utility
     Loaded: loaded (/usr/lib/systemd/system/fetchmail.service; disabled; vendor preset: disabled)
     Active: active (running) since Thu 2020-05-28 05:26:52 EDT; 1s ago
   Main PID: 18688 (fetchmail)
      Tasks: 1 (limit: 2340)
     Memory: 920.0K
        CPU: 10ms
     CGroup: /system.slice/fetchmail.service
             └─18688 /usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example

May 28 05:26:52 ci-vm-10-0-138-45.hosted.upshift.rdu2.redhat.com systemd[1]: Started A remote-mail retrieval utility.
# find /var/spool/ -name \*pid\*
/var/spool/postfix/pid
/var/spool/postfix/pid/master.pid
/var/spool/mail/.fetchmail.pid
# ls -Z /var/spool/mail/.fetchmail.pid
system_u:object_r:fetchmail_uidl_cache_t:s0 /var/spool/mail/.fetchmail.pid
# matchpathcon /var/spool/mail/.fetchmail.pid
/var/spool/mail/.fetchmail.pid	system_u:object_r:mail_spool_t:s0
# restorecon -Rv /var/spool/mail/
Relabeled /var/spool/mail/.fetchmail.pid from system_u:object_r:fetchmail_uidl_cache_t:s0 to system_u:object_r:mail_spool_t:s0
# service fetchmail status
Redirecting to /bin/systemctl status fetchmail.service
● fetchmail.service - A remote-mail retrieval utility
     Loaded: loaded (/usr/lib/systemd/system/fetchmail.service; disabled; vendor preset: disabled)
     Active: active (running) since Thu 2020-05-28 05:26:52 EDT; 1min 6s ago
   Main PID: 18688 (fetchmail)
      Tasks: 1 (limit: 2340)
     Memory: 920.0K
        CPU: 10ms
     CGroup: /system.slice/fetchmail.service
             └─18688 /usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example

May 28 05:26:52 ci-vm-10-0-138-45.hosted.upshift.rdu2.redhat.com systemd[1]: Started A remote-mail retrieval utility.
# service fetchmail stop
Redirecting to /bin/systemctl stop fetchmail.service
# ausearch -m avc -i 
----
type=AVC msg=audit(05/28/2020 05:28:01.188:476) : avc:  denied  { unlink } for  pid=18688 comm=fetchmail name=.fetchmail.pid dev="vda1" ino=1565 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0 
#

After running the "restorecon -Rv /var/spool/mail" command, which corrects the labels according to file context patterns, the fetchmail service is not able to delete its PID file.

--- Additional comment from Milos Malik on 2020-05-28 09:37:35 UTC ---

If the PID file exists and it is labeled mail_spool_t, then the fetchmail service cannot start again. Following SELinux denials appear in enforcing mode:
----
type=PROCTITLE msg=audit(05/28/2020 05:35:43.493:486) : proctitle=/usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example 
type=PATH msg=audit(05/28/2020 05:35:43.493:486) : item=1 name=/var/spool/mail/.fetchmail.pid inode=1565 dev=fc:01 mode=file,600 ouid=mail ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=DELETE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(05/28/2020 05:35:43.493:486) : item=0 name=/var/spool/mail/ inode=686 dev=fc:01 mode=dir,775 ouid=root ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/28/2020 05:35:43.493:486) : cwd=/ 
type=SYSCALL msg=audit(05/28/2020 05:35:43.493:486) : arch=x86_64 syscall=unlink success=no exit=EACCES(Permission denied) a0=0x5650cc5751f0 a1=0x0 a2=0x7f41e5346840 a3=0x1 items=2 ppid=1 pid=18819 auid=unset uid=mail gid=mail euid=mail suid=mail fsuid=mail egid=mail sgid=mail fsgid=mail tty=(none) ses=unset comm=fetchmail exe=/usr/bin/fetchmail subj=system_u:system_r:fetchmail_t:s0 key=(null) 
type=AVC msg=audit(05/28/2020 05:35:43.493:486) : avc:  denied  { unlink } for  pid=18819 comm=fetchmail name=.fetchmail.pid dev="vda1" ino=1565 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0 
----
type=PROCTITLE msg=audit(05/28/2020 05:35:43.496:487) : proctitle=/usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example 
type=PATH msg=audit(05/28/2020 05:35:43.496:487) : item=0 name=/var/spool/mail/.fetchmail.pid inode=1565 dev=fc:01 mode=file,600 ouid=mail ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/28/2020 05:35:43.496:487) : cwd=/ 
type=SYSCALL msg=audit(05/28/2020 05:35:43.496:487) : arch=x86_64 syscall=truncate success=no exit=EACCES(Permission denied) a0=0x5650cc5751f0 a1=0x0 a2=0x0 a3=0x7f41e5617483 items=1 ppid=1 pid=18819 auid=unset uid=mail gid=mail euid=mail suid=mail fsuid=mail egid=mail sgid=mail fsgid=mail tty=(none) ses=unset comm=fetchmail exe=/usr/bin/fetchmail subj=system_u:system_r:fetchmail_t:s0 key=(null) 
type=AVC msg=audit(05/28/2020 05:35:43.496:487) : avc:  denied  { write } for  pid=18819 comm=fetchmail name=.fetchmail.pid dev="vda1" ino=1565 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0 
----

--- Additional comment from Milos Malik on 2020-05-28 09:40:07 UTC ---

The only SELinux denial that appears in permissive mode is:
----
type=PROCTITLE msg=audit(05/28/2020 05:38:59.398:492) : proctitle=/usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example 
type=PATH msg=audit(05/28/2020 05:38:59.398:492) : item=1 name=/var/spool/mail/.fetchmail.pid inode=1565 dev=fc:01 mode=file,600 ouid=mail ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=DELETE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(05/28/2020 05:38:59.398:492) : item=0 name=/var/spool/mail/ inode=686 dev=fc:01 mode=dir,775 ouid=root ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/28/2020 05:38:59.398:492) : cwd=/ 
type=SYSCALL msg=audit(05/28/2020 05:38:59.398:492) : arch=x86_64 syscall=unlink success=yes exit=0 a0=0x564c56d871f0 a1=0x0 a2=0x7fed835f9840 a3=0x1 items=2 ppid=1 pid=18859 auid=unset uid=mail gid=mail euid=mail suid=mail fsuid=mail egid=mail sgid=mail fsgid=mail tty=(none) ses=unset comm=fetchmail exe=/usr/bin/fetchmail subj=system_u:system_r:fetchmail_t:s0 key=(null) 
type=AVC msg=audit(05/28/2020 05:38:59.398:492) : avc:  denied  { unlink } for  pid=18859 comm=fetchmail name=.fetchmail.pid dev="vda1" ino=1565 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=1 
----

--- Additional comment from Milos Malik on 2020-05-28 09:46:19 UTC ---

# matchpathcon /var/spool/
/var/spool	system_u:object_r:var_spool_t:s0
# matchpathcon /var/spool/mail/
/var/spool/mail	system_u:object_r:mail_spool_t:s0
# sesearch -s fetchmail_t -t mail_spool_t -T
type_transition fetchmail_t mail_spool_t:file fetchmail_uidl_cache_t;
# 

It seems that file context pattern for "/var/spool/mail/.fetchmail.pid" is missing:

# semanage fcontext -l | grep fetchmail_uidl_cache_t
/var/lib/fetchmail(/.*)?                           all files          system_u:object_r:fetchmail_uidl_cache_t:s0 
/var/mail/\.fetchmail-UIDL-cache                   regular file       system_u:object_r:fetchmail_uidl_cache_t:s0 
#
Comment 7 Milos Malik 2020-11-12 20:02:06 UTC 
The automated TC found following SELinux denials:
----
type=PROCTITLE msg=audit(11/12/2020 12:15:16.059:267) : proctitle=/usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example 
type=PATH msg=audit(11/12/2020 12:15:16.059:267) : item=1 name=/var/spool/mail/.fetchmail.pid inode=33698504 dev=fd:00 mode=file,600 ouid=mail ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=DELETE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(11/12/2020 12:15:16.059:267) : item=0 name=/var/spool/mail/ inode=33602346 dev=fd:00 mode=dir,775 ouid=root ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/12/2020 12:15:16.059:267) : cwd=/ 
type=SYSCALL msg=audit(11/12/2020 12:15:16.059:267) : arch=x86_64 syscall=unlink success=no exit=EACCES(Permission denied) a0=0x56493313d3b0 a1=0x23 a2=0x7f681c58b810 a3=0x56493211f198 items=2 ppid=1 pid=31809 auid=unset uid=mail gid=mail euid=mail suid=mail fsuid=mail egid=mail sgid=mail fsgid=mail tty=(none) ses=unset comm=fetchmail exe=/usr/bin/fetchmail subj=system_u:system_r:fetchmail_t:s0 key=(null) 
type=AVC msg=audit(11/12/2020 12:15:16.059:267) : avc:  denied  { unlink } for  pid=31809 comm=fetchmail name=.fetchmail.pid dev="dm-0" ino=33698504 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0 
----
type=PROCTITLE msg=audit(11/12/2020 12:15:16.059:268) : proctitle=/usr/bin/fetchmail -d 300 --fetchmailrc /etc/fetchmailrc.example 
type=PATH msg=audit(11/12/2020 12:15:16.059:268) : item=0 name=/var/spool/mail/.fetchmail.pid inode=33698504 dev=fd:00 mode=file,600 ouid=mail ogid=mail rdev=00:00 obj=system_u:object_r:mail_spool_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/12/2020 12:15:16.059:268) : cwd=/ 
type=SYSCALL msg=audit(11/12/2020 12:15:16.059:268) : arch=x86_64 syscall=truncate success=no exit=EACCES(Permission denied) a0=0x56493313d3b0 a1=0x0 a2=0x7f681c58b810 a3=0x0 items=1 ppid=1 pid=31809 auid=unset uid=mail gid=mail euid=mail suid=mail fsuid=mail egid=mail sgid=mail fsgid=mail tty=(none) ses=unset comm=fetchmail exe=/usr/bin/fetchmail subj=system_u:system_r:fetchmail_t:s0 key=(null) 
type=AVC msg=audit(11/12/2020 12:15:16.059:268) : avc:  denied  { write } for  pid=31809 comm=fetchmail name=.fetchmail.pid dev="dm-0" ino=33698504 scontext=system_u:system_r:fetchmail_t:s0 tcontext=system_u:object_r:mail_spool_t:s0 tclass=file permissive=0 
----
Comment 8 Milos Malik 2020-11-12 20:13:49 UTC 
Above-mentioned SELinux denials are in fact consequences of this command:

:: [ 12:15:14 ] :: [  BEGIN   ] :: Running 'restorecon -Rv /run /var'
Relabeled /var/spool/mail/.fetchmail.pid from system_u:object_r:fetchmail_uidl_cache_t:s0 to system_u:object_r:mail_spool_t:s0
:: [ 12:15:15 ] :: [   PASS   ] :: Command 'restorecon -Rv /run /var' (Expected 0, got 0)
Comment 11 Zdenek Pytela 2020-11-13 08:52:12 UTC 
I've submitted a Fedora PR to correct the previous fix:
https://github.com/fedora-selinux/selinux-policy-contrib/pull/364
Comment 19 errata-xmlrpc 2021-05-18 14:57:37 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 (selinux-policy bug fix and enhancement update), 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-2021:1639
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