Re: SELinux blocking Samba share mounting?

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On Feb 12, 2009, at 4:43 PM, Daniel J Walsh wrote:

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Paul Howarth wrote:
On Thu, 12 Feb 2009 14:20:34 -0500
Steven Stromer <filter@xxxxxxxxxxxxxxxxx> wrote:

Hopefully posting to the right list!

I'm starting to migrate a few Fedora boxes over to the latest version
of CentOS 5 running the latest version of samba:

[~]# smbstatus
Samba version 3.0.28-1.el5_2.1


However, I am having a hard time getting SELinux to permit the
mounting of shares on the first CentOS box. Disabling SELinux permits
the shares to mount without problem:

[~]# setenforce 1
[~]# mount -t cifs //192.168.10.3/PHFiles /mnt/samba -o
username=****,password=****,rw retrying with upper case share name
mount error 6 = No such device or address
[~]# setenforce 0
[~]# mount -t cifs //192.168.10.3/PHFiles /mnt/samba -o
username=****,password=****,rw [~]# ls -la /mnt/samba/
total 8
d---rws---+ 6 samba       samba          0 Feb 10 11:17 .
drwxr-xr-x  3 root        root        4096 Feb 12 11:13 ..
d---rws---+ 2 technology  technology     0 Feb 10 11:14 Computing
d---rws---+ 2 development development    0 Feb 10 11:17 Development
d---rws---+ 2 root        public         0 Feb 10 11:16 Marketing &
Design d---rws---+ 2 root public 0 Feb 10 11:14 Public
Computing [~]# umount /mnt/samba/
[~]# setenforce 1


Installed policy version is:
selinux-policy.noarch              2.4.6-137.1.el5
selinux-policy-targeted.noarch     2.4.6-137.1.el5


The two shared directories are:

[~]# ls -laZ /home/server1/PHFiles/
d---rws---+ samba samba system_u:object_r:samba_share_t .
drwxr-xr-x  root        root        root:object_r:user_home_dir_t
  .. d---rws---+ technology  technology  root:object_r:samba_share_t
    Computing d---rws---+ development development
root:object_r:samba_share_t      Development d---rws---+ root
      public      root:object_r:samba_share_t      Marketing &
Design d---rws---+ root        public
    root:object_r:samba_share_t      Public Computing

and

[~]# ls -laZ /var/www/html
d---rwsr-x+ development development
system_u:object_r:public_content_rw_t . drwxr-xr-x  root        root
      system_u:object_r:httpd_sys_content_t .. ----rwxr-x+
development development root:object_r:public_content_rw_t .DS_Store
d---rwsr-x+ development development root:object_r:public_content_rw_t
private d---rwsr-x+ development development
root:object_r:public_content_rw_t public

(I am aware that my permissions seem a bit untraditional. I am
running an experiment with extended ACL configuration on samba
shares. However, I do not believe this to have any bearing on my
present problems, as I have numerous other production servers running with these permissions under SELinux, and, again, turning SELinux off
resolves my problems instantly.)


The following has been executed with no apparent effect:
setsebool -P allow_smbd_anon_write=1


The following have been executed with no apparent effect (so these
have been turned back off): setsebool -P smbd_disable_trans=1
setsebool -P nmbd_disable_trans=1


I've added the new contexts to file_contexts, and executed
'restorecon -R' to the two shared
directories: /home/server1/PHFiles(/.*)? --
system_u:object_r:samba_share_t /var/www/html(/.*)? --
system_u:object_r:public_content_rw_t


setroubleshoot-server is installed, but no AVC denials are reported
to /var/log/messages. Instead, when SELinux is enforcing, I get the
error: smbd[11852]:   '/home/server1/PHFiles' does not exist or
permission denied when connecting to [PHFiles] Error was Permission
denied


And, finally, I've rebooted. All to no avail. Any assistance would be
much appreciated!

If the audit daemon is running, the AVC denials will be
in /var/log/audit/audit.log rather than /var/log/messages.

fedora-selinux-list would probably be more appropriate for this by the
way.

Paul.


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setsebool -P use_samba_home_dirs 1
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Daniel, thanks for the reply. No success. I omitted mentioning that I had tried this, as well. However, I just confirmed again that this is not the fix. I'm not even sure why home directories would need to be permitted, as I am not using them. I even have [homes] commented out in smb.conf, which I'll include for reference:


# Samba config file
[global]
# WINS
	wins support = yes
	local master = yes
	os level = 99
	domain master = yes
	preferred master = yes
	workgroup = 478FIRST
# NETBIOS/DNS
	netbios name = server1
	name resolve order = wins lmhosts hosts bcast
	dns proxy = yes
# SMB/CIFS
	smb ports = 139
	server string = server1
# AUTHENTICATION
	interfaces = eth0
	security = user
	passdb backend = tdbsam
	encrypt passwords = yes
# LOGGING
	log file = /var/log/samba/%m.log
	max log size = 50
# CUPS
	load printers = yes
	cups options = raw

#[homes]
#	comment = Home Directories
#	read only = No
#	browseable = No

# [printers]
# 	comment = All Printers
# 	path = /usr/spool/samba
# 	printable = Yes
# 	browseable = No

[PHFiles]
	path = /home/server1/PHFiles
	writable = yes
	browseable = yes
	available = yes
	create mask = 0660
	force create mode = 0660
	directory mask = 0770
	force directory mode = 0770
	inherit acls = yes
	inherit owner = yes
	hosts allow = 127. 192.168.5.
	map archive = no
	map readonly = no
	map acl inherit = yes

[html]
	path = /var/www/html
	writable = yes
	browseable = yes
	available = yes
	create mask = 0660
	force create mode = 0660
	directory mask = 0770
	force directory mode = 0770
	inherit acls = yes
	inherit owner = yes
	hosts allow = 127. 192.168.5.
	map archive = no
	map readonly = no
	map acl inherit = yes

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