Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux

8.3.7. sealert Messages

Denials are assigned IDs, as seen in /var/log/messages. The following is an example AVC denial (logged to messages) that occurred when the Apache HTTP Server (running in the httpd_t domain) attempted to access the /var/www/html/file1 file (labeled with the samba_share_t type):
hostname setroubleshoot: SELinux is preventing httpd (httpd_t) "getattr" to /var/www/html/file1 (samba_share_t). For complete SELinux messages. run sealert -l 84e0b04d-d0ad-4347-8317-22e74f6cd020
As suggested, run the sealert -l 84e0b04d-d0ad-4347-8317-22e74f6cd020 command to view the complete message. This command only works on the local machine, and presents the same information as the sealert GUI:
~]$ sealert -l 84e0b04d-d0ad-4347-8317-22e74f6cd020


SELinux is preventing httpd (httpd_t) "getattr" to /var/www/html/file1

Detailed Description:

SELinux denied access to /var/www/html/file1 requested by httpd.
/var/www/html/file1 has a context used for sharing by different program. If you
would like to share /var/www/html/file1 from httpd also, you need to change its
file context to public_content_t. If you did not intend to this access, this
could signal a intrusion attempt.

Allowing Access:

You can alter the file context by executing chcon -t public_content_t

Fix Command:

chcon -t public_content_t '/var/www/html/file1'

Additional Information:

Source Context                unconfined_u:system_r:httpd_t:s0
Target Context                unconfined_u:object_r:samba_share_t:s0
Target Objects                /var/www/html/file1 [ file ]
Source                        httpd
Source Path                   /usr/sbin/httpd
Port                          <Unknown>
Host                          hostname
Source RPM Packages           httpd-2.2.10-2
Target RPM Packages
Policy RPM                    selinux-policy-3.5.13-11.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   public_content
Host Name                     hostname
Platform                      Linux hostname #1 SMP Thu Oct
30 00:49:42 EDT 2008 i686 i686
Alert Count                   4
First Seen                    Wed Nov  5 18:53:05 2008
Last Seen                     Wed Nov  5 01:22:58 2008
Local ID                      84e0b04d-d0ad-4347-8317-22e74f6cd020
Line Numbers

Raw Audit Messages

node=hostname type=AVC msg=audit(1225812178.788:101): avc:  denied  { getattr } for  pid=2441 comm="httpd" path="/var/www/html/file1" dev=dm-0 ino=284916 scontext=unconfined_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:samba_share_t:s0 tclass=file

node=hostname type=SYSCALL msg=audit(1225812178.788:101): arch=40000003 syscall=196 success=no exit=-13 a0=b8e97188 a1=bf87aaac a2=54dff4 a3=2008171 items=0 ppid=2439 pid=2441 auid=502 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=3 comm="httpd" exe="/usr/sbin/httpd" subj=unconfined_u:system_r:httpd_t:s0 key=(null)
A brief summary of the denied action. This is the same as the denial in /var/log/messages. In this example, the httpd process was denied access to a file (file1), which is labeled with the samba_share_t type.
Detailed Description
A more verbose description. In this example, file1 is labeled with the samba_share_t type. This type is used for files and directories that you want to export via Samba. The description suggests changing the type to a type that can be accessed by the Apache HTTP Server and Samba, if such access is desired.
Allowing Access
A suggestion for how to allow access. This may be relabeling files, enabling a Boolean, or making a local policy module. In this case, the suggestion is to label the file with a type accessible to both the Apache HTTP Server and Samba.
Fix Command
A suggested command to allow access and resolve the denial. In this example, it gives the command to change the file1 type to public_content_t, which is accessible to the Apache HTTP Server and Samba.
Additional Information
Information that is useful in bug reports, such as the policy package name and version (selinux-policy-3.5.13-11.fc12), but may not help towards solving why the denial occurred.
Raw Audit Messages
The raw audit messages from /var/log/audit/audit.log that are associated with the denial. Refer to Section 8.3.6, “Raw Audit Messages” for information about each item in the AVC denial.