RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1325527 - SELinux policy breaks squid's ssl_crtd
Summary: SELinux policy breaks squid's ssl_crtd
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:
Depends On:
Blocks: 1331269
TreeView+ depends on / blocked
 
Reported: 2016-04-09 14:58 UTC by W. Michael Petullo
Modified: 2017-08-01 15:10 UTC (History)
9 users (show)

Fixed In Version: selinux-policy-3.13.1-134.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1331269 (view as bug list)
Environment:
Last Closed: 2017-08-01 15:10:10 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:1861 0 normal SHIPPED_LIVE selinux-policy bug fix update 2017-08-01 17:50:24 UTC

Description W. Michael Petullo 2016-04-09 14:58:46 UTC 
Description of problem:
I am using CentOS 7, but I found a possible issue in the SELinux policy which might be of interest to RHEL. We have squid configured using sslbump to act as a TLS man-in-the-middle with the ability to peer into HTTPS connections (on an exercise network, dijoint from the Internet). We found that the targeted SELinux policy forbids /usr/lib64/squid/ssl_crtd from updating its certificate database. This is because /etc/squid/ssl_db is labeled squid_conf_t, and this does not permit directory or file writes.

We fixed this by relabeling /etc/squid/ssl_db and the objects contained therein with:

system_u:object_r:squid_cache_t:s0

Version-Release number of selected component (if applicable):
squid-3.3.8-26.el7.x86_64
selinux-policy-targeted-3.13.1-60.el7_2.3.noarch

How reproducible:
Every time

Steps to Reproduce:
1. Install squid
2. Configure squid's sslbump
3. Visit an HTTPS site using a client configured to connect through squid

Actual results:
/usr/lib64/squid/ssl_crtd produces AVC errors and malfunctions.
Comment 2 Milos Malik 2016-04-11 07:01:39 UTC 
Please collect SELinux denials that appeared on your machine and attach them here. Thank you.
Comment 3 Lukas Vrabec 2016-06-22 15:57:59 UTC 
Please see comment2
Comment 4 will 2016-07-26 10:03:56 UTC 
I am also experiencing this problem. 

These entries appear in audit log:

type=AVC msg=audit(1469523598.300:4698): avc:  denied  { read } for  pid=14890 comm="ssl_crtd" name="index.txt" dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1469523598.300:4698): arch=c000003e syscall=2 success=no exit=-13 a0=7f0ebb5c8288 a1=0 a2=1b6 a3=24 items=0 ppid=14888 pid=14890 auid=4294967295 uid=23 gid=23 euid=23 suid=23 fsuid=23 egid=23 sgid=23 fsgid=23 tty=(none) ses=4294967295 comm="ssl_crtd" exe="/usr/lib64/squid/ssl_crtd" subj=system_u:system_r:squid_t:s0 key=(null)
type=PROCTITLE msg=audit(1469523598.300:4698): proctitle=2873736C5F6372746429002D73002F7661722F6C69622F73736C5F6462002D4D00344D42002D620034303936
type=AVC msg=audit(1469523598.301:4699): avc:  denied  { read } for  pid=14889 comm="ssl_crtd" name="index.txt" dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1469523598.301:4699): arch=c000003e syscall=2 success=no exit=-13 a0=7f338a3ce288 a1=0 a2=1b6 a3=24 items=0 ppid=14888 pid=14889 auid=4294967295 uid=23 gid=23 euid=23 suid=23 fsuid=23 egid=23 sgid=23 fsgid=23 tty=(none) ses=4294967295 comm="ssl_crtd" exe="/usr/lib64/squid/ssl_crtd" subj=system_u:system_r:squid_t:s0 key=(null)
type=PROCTITLE msg=audit(1469523598.301:4699): proctitle=2873736C5F6372746429002D73002F7661722F6C69622F73736C5F6462002D4D00344D42002D620034303936
type=AVC msg=audit(1469523598.301:4700): avc:  denied  { read } for  pid=14891 comm="ssl_crtd" name="index.txt" dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1469523598.301:4700): arch=c000003e syscall=2 success=no exit=-13 a0=7f4a431f1288 a1=0 a2=1b6 a3=24 items=0 ppid=14888 pid=14891 auid=4294967295 uid=23 gid=23 euid=23 suid=23 fsuid=23 egid=23 sgid=23 fsgid=23 tty=(none) ses=4294967295 comm="ssl_crtd" exe="/usr/lib64/squid/ssl_crtd" subj=system_u:system_r:squid_t:s0 key=(null)
type=PROCTITLE msg=audit(1469523598.301:4700): proctitle=2873736C5F6372746429002D73002F7661722F6C69622F73736C5F6462002D4D00344D42002D620034303936
type=AVC msg=audit(1469523598.307:4701): avc:  denied  { read } for  pid=14894 comm="ssl_crtd" name="index.txt" dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1469523598.307:4701): arch=c000003e syscall=2 success=no exit=-13 a0=7fc8e888a288 a1=0 a2=1b6 a3=24 items=0 ppid=14888 pid=14894 auid=4294967295 uid=23 gid=23 euid=23 suid=23 fsuid=23 egid=23 sgid=23 fsgid=23 tty=(none) ses=4294967295 comm="ssl_crtd" exe="/usr/lib64/squid/ssl_crtd" subj=system_u:system_r:squid_t:s0 key=(null)
type=PROCTITLE msg=audit(1469523598.307:4701): proctitle=2873736C5F6372746429002D73002F7661722F6C69622F73736C5F6462002D4D00344D42002D620034303936
type=AVC msg=audit(1469523598.308:4702): avc:  denied  { read } for  pid=14893 comm="ssl_crtd" name="index.txt" dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1469523598.308:4702): arch=c000003e syscall=2 success=no exit=-13 a0=7f6f55571288 a1=0 a2=1b6 a3=24 items=0 ppid=14888 pid=14893 auid=4294967295 uid=23 gid=23 euid=23 suid=23 fsuid=23 egid=23 sgid=23 fsgid=23 tty=(none) ses=4294967295 comm="ssl_crtd" exe="/usr/lib64/squid/ssl_crtd" subj=system_u:system_r:squid_t:s0 key=(null)
type=PROCTITLE msg=audit(1469523598.308:4702): proctitle=2873736C5F6372746429002D73002F7661722F6C69622F73736C5F6462002D4D00344D42002D6
Comment 5 Milos Malik 2017-03-20 14:30:56 UTC 
When ausearch -i is used then the AVC messages look this way:
----
type=PROCTITLE msg=audit(07/26/2016 10:59:58.301:4700) : proctitle=(ssl_crtd) -s /var/lib/ssl_db -M 4MB -b 4096 
type=SYSCALL msg=audit(07/26/2016 10:59:58.301:4700) : arch=x86_64 syscall=open success=no exit=EACCES(Permission denied) a0=0x7f4a431f1288 a1=O_RDONLY a2=0x1b6 a3=0x24 items=0 ppid=14888 pid=14891 auid=unset uid=unknown(23) gid=unknown(23) euid=unknown(23) suid=unknown(23) fsuid=unknown(23) egid=unknown(23) sgid=unknown(23) fsgid=unknown(23) tty=(none) ses=unset comm=ssl_crtd exe=/usr/lib64/squid/ssl_crtd subj=system_u:system_r:squid_t:s0 key=(null) 
type=AVC msg=audit(07/26/2016 10:59:58.301:4700) : avc:  denied  { read } for  pid=14891 comm=ssl_crtd name=index.txt dev="dm-0" ino=264611 scontext=system_u:system_r:squid_t:s0 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0 
----

I didn't know where the index.txt file should be located, but now it's clear:

# strace -f -e open /usr/lib64/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB -b 4096
open("/etc/ld.so.preload", O_RDONLY|O_CLOEXEC) = 3
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libssl.so.10", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libcrypto.so.10", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libgssapi_krb5.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libkrb5.so.3", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libcom_err.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libk5crypto.so.3", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libkrb5support.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libkeyutils.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/etc/pki/tls/legacy-settings", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/var/lib/ssl_db/index.txt", O_RDONLY) = -1 ENOENT (No such file or directory)
/usr/lib64/squid/ssl_crtd: Uninitialized SSL certificate database directory: /var/lib/ssl_db. To initialize, run "ssl_crtd -c -s /var/lib/ssl_db".
+++ exited with 0 +++
#

Unfortunately, selinux-policy is not fixed yet:
# matchpathcon /var/lib/ssl_db
/var/lib/ssl_db	system_u:object_r:var_lib_t:s0
# matchpathcon /var/lib/ssl_db/index.txt
/var/lib/ssl_db/index.txt	system_u:object_r:var_lib_t:s0
# sesearch -s squid_t -t var_lib_t -c file -p read --allow -C

#
Comment 9 errata-xmlrpc 2017-08-01 15:10:10 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-2017:1861
Note You need to log in before you can comment on or make changes to this bug.