[config.py,bind.py,populate_sshFingerprint.py] Configuration pour sshfp dans config.py, ajout d'un script pour ajouter les clef des serveur dans ldap

Ignore-this: 5fe4b7490ca1f97168b6ce457374ffb5

darcs-hash:20130118011803-3a55a-2fb24947d4f3807082ae5f0da41741e0ef0086c8.gz

gestion/config.py

@@ -116,6 +116,15 @@ cfengine_main = bcfg2_main
 ISCSI_MAP_FILE = "/usr/scripts/var/iscsi_names.py"
 ISCSI_MAP_FILE_TEMPLATE = "/usr/scripts/var/iscsi_names_%s.py"
 
+# format: { algorithm : (IANA_id, ssh_algo) }
+# où algorithm est tel qu'il apparait dans les fichiers /etc/ssh/ssh_host_%s_key.pub % algorithm
+# IANA_id correspond à l'entier attribué par l'IANA pour l'algorithm dans les champs dns SSHFP
+# ssh_algo correspond a la première chaine de charactère donnant le nom de l'algorithme de chiffrement lorsque la clef ssh est dans le format openssh (algo key comment)
+sshfp_algo = {
+        "rsa" : (1,"ssh-rsa"),
+        "dsa" : (2,"ssh-dss"),
+    }
+
 ## Impression
 class impression:
     """Cette classe contient toutes les variables

gestion/gen_confs/bind.py

@@ -290,10 +290,14 @@ zone "%(NOM_zone)s" {
                 # Si la machine à des clefs ssh, on ajoute les champs SSFP correspondant
                 for sshkey in machine.sshFingerprint():
                     try:
-                        [algo,key]=sshkey.split()[:2]
-                        if algo == "ssh-rsa": algo=1
-                        elif algo == "ssh-dss": algo=2
-                        else: raise ValueError("Invalid Algorithms %s" % algo)
+                        [algo_txt,key]=sshkey.split()[:2]
+                        algo=None
+                        for value in config.sshfp_algo.values():
+                            if algo_txt == value[1]:
+                                algo=value[0]
+                                break
+                        if not algo: 
+                            raise ValueError("Invalid Algorithms %s" % algo_txt)
                         key=hashlib.sha1(base64.b64decode(key)).hexdigest()
                         ligne +="%s\tIN\tSSHFP\t%s\t1\t%s\n" % (nom,algo,key)
                     except(ValueError,TypeError): pass

gestion/gen_confs/populate_sshFingerprint.py

@@ -0,0 +1,64 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+import subprocess
+import sys
+import os
+from socket import gethostname
+from netifaces import interfaces, ifaddresses, AF_INET
+
+sys.path.append('/usr/scripts/lc_ldap')
+sys.path.append('/usr/scripts/gestion')
+sys.path.append('/etc/crans/secrets/')
+
+import lc_ldap
+import config
+
+conn=lc_ldap.lc_ldap_admin()
+
+ssh_algo = config.sshfp_algo.keys()
+
+def ip4_addresses():
+    ip_list = []
+    for interface in interfaces():
+        if interface!='lo' and AF_INET in ifaddresses(interface).keys():
+            for link in ifaddresses(interface)[AF_INET]:
+                ip_list.append(link['addr'])
+    return ip_list
+
+def ssh_keyscan(host,algo):
+    p=subprocess.Popen(["/usr/bin/ssh-keyscan", "-t",  "%s" %  algo,"%s" % host],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
+    ret=p.communicate()[0].split()
+    key=ret[2]
+    return key
+    
+    
+def get_machines():
+    machines=[]
+    for ip in  set(ip4_addresses()):
+        machines.extend(conn.search('ipHostNumber=%s' %ip,mode='rw'))
+    return machines
+    
+def get_local_keys():
+    keys={}
+    for algo in ssh_algo:
+        if os.path.isfile('/etc/ssh/ssh_host_%s_key.pub' % algo):
+            keys[algo]=open('/etc/ssh/ssh_host_%s_key.pub' % algo).read()
+    return keys
+    
+def check_keys(keys):
+    return dict([ (algo,key.split()[1] == ssh_keyscan('localhost',algo)) for algo,key in keys.items() ])
+    
+def publish_keys():
+    keys=get_local_keys()
+    validation=check_keys(keys)
+    machines=get_machines()
+    for machine in machines:
+        sshkeys_old=[key.value for key in machine.get('sshFingerprint',[])]
+        sshkeys_new=[key.decode('UTF-8') for algo,key in keys.items() if validation[algo]]
+        if not set(sshkeys_old)==set(sshkeys_new):
+            machine['sshFingerprint']=sshkeys_new
+            machine.save()
+    
+
+if __name__ == '__main__' :
+    publish_keys()