diff --git a/yunohost_firewall.py b/yunohost_firewall.py
index 7e04a45a..d66f6aa8 100644
--- a/yunohost_firewall.py
+++ b/yunohost_firewall.py
@@ -2,7 +2,98 @@
 
 import os
 import sys
-import yaml
+try:
+    import yaml
+except ImportError:
+    sys.stderr.write('Error: Yunohost CLI Require yaml lib\n')
+    sys.stderr.write('apt-get install python-yaml\n')
+    sys.exit(1)
 
-def firewall_allow(args):
-    pass
+def firewall_allow(protocol=None,port=None,name=None):
+    if protocol == "Both":
+    chaineTCP="iptables -A INPUT -p tcp -i eth0 --dport "+ port +" -j ACCEPT"
+	chaineUDP="iptables -A INPUT -p udp -i eth0 --dport "+ port +" -j ACCEPT"
+	append_port(port,'tcp')
+	append_port(port,'udp')
+	os.system(chaineTCP)
+	os.system(chaineUDP)
+
+    else:
+        chaine="iptables -A INPUT -p "+ protocol +" -i eth0 --dport "+ port +" -j ACCEPT"
+        append_port(port,protocol)
+        os.system(chaine)
+
+def firewall_disallow(protocol=None,port=None,name=None):
+    if protocol == "Both":
+        chaineTCP="iptables -A INPUT -p tcp -i eth0 --dport "+ port +" -j REJECT"
+        chaineUDP="iptables -A INPUT -p udp -i eth0 --dport "+ port +" -j REJECT"
+        remove_port(port,'tcp')
+        remove_port(port,'udp')
+        os.system(chaineTCP)
+        os.system(chaineUDP)
+    else:
+        chaine="iptables -A INPUT -p "+ protocol +" -i eth0 --dport "+ port +" -j REJECT"
+        os.system(chaine)
+        remove_port(port,protocol)
+        os.system(chaine)
+
+def firewall_list():
+    '''
+	Parse and display firwall.yml
+	'''
+    with open ('firewall.yml') as f:
+        firewall = yaml.load(f)
+        print(firewall)
+        
+def firewall_reload():
+    '''
+	Clear filter IPTABLE's table
+	Allow SSH
+	Parse firewall.yml extract the list of port allowed
+	Allow all port in the list
+	Prohibit the rest
+	'''
+    os.system("iptables -P INPUT ACCEPT")
+    os.system ("iptables -F")
+    os.system ("iptables -X")
+    os.system ("iptables -A INPUT -p tcp -i eth0 --dport 22 -j ACCEPT")
+    with open('firewall.yml','r') as f:
+        firewall = yaml.load(f)
+    listPortTCP=firewall['ipv4']["TCP"]
+    listPortUDP=firewall['ipv4']["UDP"]
+    for port in enumerate (listPortTCP):
+        os.system ("iptables -A INPUT -p tcp -i eth0 --dport "+ port +" -j ACCEPT")
+    for port in enumerate (listPortUDP):
+        os.system ("iptables -A INPUT -p udp -i eth0 --dport "+ port +" -j ACCEPT")
+        os.system ("iptables -P INPUT DROP")
+
+def append_port(port=None,protocol=None):
+    '''
+	Append port in firewall.yml
+	'''
+    with open('firewall.yml','r') as f:
+        firewall = yaml.load(f)
+		if port not in firewall['ipv4'][protocol]:
+			firewall['ipv4'][protocol].append(int(port))
+			firewall['ipv4'][protocol].sort()
+        f.close
+    os.system("mv firewall.yml firewall.yml.old")
+    with open('firewall.yml','w') as f:
+        yaml.dump(firewall,f)
+        f.close
+
+
+def remove_port(port=None,protocol=None):
+    '''
+	Remove port from firewall.yml
+	'''
+    with open('firewall.yml','r') as f:
+        firewall = yaml.load(f)
+        if port in firewall['ipv4'][protocol]:
+			firewall['ipv4'][protocol].remove(int(port))
+			firewall['ipv4'][protocol].sort()
+        f.close
+    os.system("mv firewall.yml firewall.yml.old")
+    with open('firewall.yml','w') as f:
+        yaml.dump(firewall,f)
+        f.close