SELinux Apache and Symbolic Links...GGGrrrr

[Serge E. Hallyn]

Quoting Another Sillyname (anothersname at googlemail.com):
>  Hi All
> 
> OK I've been playing with this for nearly two days now and cannot seem
> to get it working at all.
> 
> In a nutshell.
> 
> Standard Apache Server setup...
> 
> in /var/www/html I have a subdirectory called reststop and within that
> is a symbolic link to a directory at
> /mnt/anotherdrive/newpath/nearlythere/reststop
> 
> I have set the permissions chcon -R 775 /var/www/html/reststop
> I have set the permissions chcon -R 775
> /mnt/anotherdrive/newpath/nearlythere/reststop
> 
> I have set the se permissions chcon -R -h -t httpd_sys_content_t
> /var/www/html/reststop
> I have set the se permissions chcon -R -h -t httpd_sys_content_t
> /mnt/anotherdrive/newpath/nearlythere/reststop
> 
> I have checked the settings using ls -Z and they are correct
> 
> I have set the http.conf to allow followsymlinks
> 
> If I set selinux to permissive I DO get an error message:-
> 
> ------------------------------------------------------------
> 
> Summary:
> 
> SELinux is preventing access to files with the label, file_t.
> 
> Detailed Description:
> 
> [SELinux is in permissive mode. This access was not denied.]
> 
> SELinux permission checks on files labeled file_t are being denied. file_t is
> the context the SELinux kernel gives to files that do not have a label. This
> indicates a serious labeling problem. No files on an SELinux box should ever be
> labeled file_t. If you have just added a disk drive to the system you can
> relabel it using the restorecon command. For example if you saved the home
> directory from a previous installation that did not use SELinux, 'restorecon -R
> -v /home' will fix the labels. Otherwise you should relabel the entire file
> system.
> 
> Allowing Access:
> 
> You can execute the following command as root to relabel your computer system:
> "touch /.autorelabel; reboot"
> 
> Additional Information:
> 
> Source Context unconfined_u:system_r:httpd_t:s0
> Target Context unconfined_u:object_r:file_t:s0
> Target Objects reststop [ dir ]
> Source httpd
> Source Path /usr/sbin/httpd
> Port <Unknown>
> Host secretsquirrel.com
> Source RPM Packages httpd-2.2.14-1.fc12
> Target RPM Packages
> Policy RPM selinux-policy-3.6.32-108.fc12
> Selinux Enabled True
> Policy Type targeted
> Enforcing Mode Permissive
> Plugin Name file
> Host Name secretsquirrel.com
> Platform Linux secretsquirrel.com
> 2.6.32.11-99.fc12.x86_64 #1 SMP Mon Apr 5 19:59:38
> UTC 2010 x86_64 x86_64
> Alert Count 1
> First Seen Mon 19 Apr 2010 03:45:40 PM BST
> Last Seen Mon 19 Apr 2010 03:45:40 PM BST
> Local ID yadayadayada
> Line Numbers
> 
> Raw Audit Messages
> 
> node=secretsquirrel.com type=AVC msg=audit(1288463622.694:23321): avc:
> denied { read } for pid=3605 comm="httpd" name="reststop" dev=dm-0
> ino=340012822 scontext=unconfined_u:system_r:httpd_t:s0
> tcontext=unconfined_u:object_r:file_t:s0 tclass=dir
> 
> node=secretsquirrel.com type=SYSCALL msg=audit(1288463622.694:23321):
> arch=c000003e syscall=2 success=yes exit=16 a0=7f2f691d91c0 a1=90800
> a2=7f2f691d5198 a3=7f2f691da150 items=0 ppid=3600 pid=3605 auid=500
> uid=48 gid=489 euid=48 suid=48 fsuid=48 egid=489 sgid=489 fsgid=489
> tty=(none) ses=2 comm="httpd" exe="/usr/sbin/httpd"
> subj=unconfined_u:system_r:httpd_t:s0 key=(null)
> 
> ----------------------------------------------------------------
> 
> Why is the error message telling me files are labelled file_t when
> they are labelled httpd_sys_content_t? To confirm that I ls -RZ | grep
> file_t in the two directories I get no files returned.

Presumably o follow the symbolic link you need permission to
walk the link target's path.  Is any directory in the path
/mnt/anotherdrive/newpath/nearlythere/reststop
of type file_t?

> What am I missing here guys? and before anyone suggests it I don't
> just want to turn selinux off, I want to actually protect my system
> properly though.
> 
> Thanks in advance
> --
> selinux mailing list
> selinux at lists.fedoraproject.org
> https://admin.fedoraproject.org/mailman/listinfo/selinux