User:Alciregi/samba-quick-doc

How to create a SAMBA share

Prerequisites

sudo dnf install samba

sudo systemctl enable smb --now

firewall-cmd --get-active-zones
sudo firewall-cmd --permanent --zone=FedoraWorkstation --add-service=samba
sudo firewall-cmd --reload

sudo systemctl enable smb --now

Sharing a directory under your home

In this example you will share a directory under your home and accessible only by your user.

Note: using the standard samba configuration (no backends, no modules), samba doesn't use the operating system users for authentication. So you have to create the samba user replicating the system one. However, the same system username must exists in order to handle filesystem permissions.

If your user name is "jane", you have to add the same username to samba. Please note: the samba password could be different from the system password.

sudo smbpasswd -a jane

Add the share definition to the /etc/samba/smb.conf configuration file

[share]
        comment = My Share
        path = /home/jane/share
        writeable = yes
        browseable = yes
        public = yes
        create mask = 0644
        directory mask = 0755
        write list = user

mkdir /home/jane/share

sudo semanage fcontext --add --type "samba_share_t" ~/share
sudo restorecon -R ~/share

sudo systemctl restart smb

Sharing a directory for many users

In this example you will share a directory (outside your home) and you will create a group of users with the right to read/write to the share.

Create a system group

sudo groupadd -G myfamily

Remember: the samba user has to be also a system user, in order to respect filesystem permissions.

sudo useradd -G myfamily jack sudo useradd -G myfamily maria

You can avoid to set a system password for such users, in order to prevent access the system via SSH or local login.

sudo smbpasswd -a jack
sudo smbpasswd -a maria

sudo mkdir /home/share
sudo chgrp myfamily /home/share
sudo chmod 770 /home/share
sudo semanage fcontext --add --type "samba_share_t" /home/share
sudo restorecon -R /home/share

Add this stanza to the /etc/samba/smb.conf, each share has its own section in the configuration file:

[family]
        comment = Family Share
        path = /home/share
        writeable = yes
        browseable = yes
        public = yes
        valid users = @myfamily
        create mask = 0660
        directory mask = 0770
        force group = +myfamily

Explanation:

valid users <-- only users of the group family have access rights (the @ sign denote a group name) force group = myfamily <--- force the creation of files and directories with this group, instead of with the user group create mask = 0660 <--- files on the filesystem are created with these permissions, so all the group users can read and write the files created by other users directory mask = 0770 <--- as before but for directories

Change a samba user password

Remember: system and samba password could be different. The system user is mandatory in order to handle filesystem permissions.

sudo smbpasswd maria

Remove a samba user

sudo smbpasswd -x maria

If you don't need the system user, remove it as well:

sudo userdel -r maria

Troubleshooting and logs

Samba log files are located in /var/log/samba/

tail -f /var/log/samba/log.smbd

You can increase the verbosity adding this directive to /etc/samba/smb.conf in the [global] stanza:

[global]

       loglevel = 5

To validate configuration file syntax: testparm

To display current samba connections, use the smbstatus command.

Trouble with accessing the share

- Be sure that the user exists as system user as well as samba user - Check if the shared directory has the right SELinux context

$ ls -dZ /home/share unconfined_u:object_r:samba_share_t:s0 /home/share

- Check if the system user has access rights to the shared directory ls -ld /home/share drwxrwx---. 5 root myfamily 4096 9 gen 15.45 /home/share

In this case the user should be in the myfamily group

- check in the configuration file if the user has access rights granted or he is in the appropriated group

Trouble with writing in the share

- Check the samba configuration file

https://selinuxproject.org/page/SambaRecipes