[CentOS] selinux question

Nataraj incoming-centos at rjl.com
Tue Aug 21 19:27:53 UTC 2018


I have a web application which uses sudo to invoke python scripts as the
user under which the application runs (NO root access).  Is there any
reason why sudo would would require sys_ptrace access for this?  I only
get this violation intermittenly, and not with every call to sudo. 
Here's the violation:

Summary:

SELinux is preventing sudo (httpd_t) "sys_ptrace" to <Unknown> (httpd_t).

Detailed Description:

SELinux denied access requested by sudo. It is not expected that this access is
required by sudo and this access may signal an intrusion attempt. It is also
possible that the specific version or configuration of the application is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable
SELinux protection altogether. Disabling SELinux protection is not recommended.
Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Additional Information:

Source Context                system_u:system_r:httpd_t
Target Context                system_u:system_r:httpd_t
Target Objects                None [ capability ]
Source                        sudo
Source Path                   /usr/bin/sudo
Port                          <Unknown>
Host                          myhost.mydomain.com
Source RPM Packages           sudo-1.7.2p1-29.el5_10
Target RPM Packages           
Policy RPM                    selinux-policy-2.4.6-351.el5
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     myhost.mydomain.com
Platform                      Linux myhost.mydomain.com 2.6.18-419.el5 #1 SMP Fri Feb
                              24 22:06:09 UTC 2017 i686 i686
Alert Count                   359
First Seen                    Tue Oct  8 09:24:50 2013
Last Seen                     Tue Aug 21 10:26:26 2018
Local ID                      717eb9a4-cc7f-4ed1-b638-5db1a841abe4
Line Numbers                  

Raw Audit Messages            

host=myhost.mydomain.com type=AVC msg=audit(1534872386.726:9642): avc:  denied  { sys_ptrace } for  pid=8458 comm="sudo" capability=19 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:system_r:httpd_t:s0 tclass=capability

host=myhost.mydomain.com type=SYSCALL msg=audit(1534872386.726:9642): arch=40000003 syscall=3 success=yes exit=166 a0=1a a1=b7ff4000 a2=400 a3=89cabf0 items=0 ppid=8979 pid=8458 auid=4294967295 uid=48 gid=48 euid=0 suid=0 fsuid=0 egid=48 sgid=48 fsgid=48 tty=(none) ses=4294967295 comm="sudo" exe="/usr/bin/sudo" subj=system_u:system_r:httpd_t:s0 key=(null)


Thank You,

Nataraj






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