Problèmes flux OpenVPN Résolu

Question

Bonjour, Je suis actuellement en apprentissage. J'ai pour projet de mettre en place une solution OpenVPN sur une VM Windows serveur 2012 R. Après avoir effectué toute l'installation est la configuration le VPN fonctionne. Cependant je me suis rendu compte que le client peut communiquer avec le serveur mes pas l'inverse. Comment puis-je résoudre ce problème ? Voici la config du fichier config_serveur.ovpn : ################################################## Sample OpenVPN 2.0 config file for ## multi-client server. ## ## This file is for the server side ## of a many-clients <-> one-server ## OpenVPN configuration. ## ## OpenVPN also supports ## single-machine <-> single-machine ## configurations (See the Examples page ## on the web site for more info). ## ## This config should work on Windows ## or Linux/BSD systems. Remember on ## Windows to quote pathnames and use ## double backslashes, e.g.: ## "C:\Program Files\OpenVPN\config\foo.key" ## ## Comments are preceded with '#' or ';' ################################################### Which local IP address should OpenVPN# listen on? (optional);local a.b.c.d# Which TCP/UDP port should OpenVPN listen on?# If you want to run multiple OpenVPN instances# on the same machine, use a different port# number for each one. You will need to# open up this port on your firewall.port 1194# TCP or UDP server?;proto tcpproto udp# "dev tun" will create a routed IP tunnel,# "dev tap" will create an ethernet tunnel.# Use "dev tap0" if you are ethernet bridging# and have precreated a tap0 virtual interface# and bridged it with your ethernet interface.# If you want to control access policies# over the VPN, you must create firewall# rules for the the TUN/TAP interface.# On non-Windows systems, you can give# an explicit unit number, such as tun0.# On Windows, use "dev-node" for this.# On most systems, the VPN will not function# unless you partially or fully disable# the firewall for the TUN/TAP interface.;dev tapdev tun# Windows needs the TAP-Win32 adapter name# from the Network Connections panel if you# have more than one. On XP SP2 or higher,# you may need to selectively disable the# Windows firewall for the TAP adapter.# Non-Windows systems usually don't need this.;dev-node MyTap# SSL/TLS root certificate (ca), certificate# (cert), and private key (key). Each client# and the server must have their own cert and# key file. The server and all clients will# use the same ca file.## See the "easy-rsa" directory for a series# of scripts for generating RSA certificates# and private keys. Remember to use# a unique Common Name for the server# and each of the client certificates.## Any X509 key management system can be used.# OpenVPN can also use a PKCS #12 formatted key file# (see "pkcs12" directive in man page).ca "C:\Program Files\OpenVPN\config\ca.crt"cert "C:\Program Files\OpenVPN\config\certificat_pour_serveur.crt"key "C:\Program Files\OpenVPN\config\certificat_pour_serveur.key" # This file should be kept secret# Diffie hellman parameters.# Generate your own with:# openssl dhparam -out dh2048.pem 2048dh "C:\Program Files\OpenVPN\config\dh2048.pem"# Network topology# Should be subnet (addressing via IP)# unless Windows clients v2.0.9 and lower have to# be supported (then net30, i.e. a /30 per client)# Defaults to net30 (not recommended);topology subnet# Configure server mode and supply a VPN subnet# for OpenVPN to draw client addresses from.# The server will take 10.8.0.1 for itself,# the rest will be made available to clients.# Each client will be able to reach the server# on 10.8.0.1. Comment this line out if you are# ethernet bridging. See the man page for more info.server 10.8.0.0 255.255.255.0# Maintain a record of client <-> virtual IP address# associations in this file. If OpenVPN goes down or# is restarted, reconnecting clients can be assigned# the same virtual IP address from the pool that was# previously assigned.ifconfig-pool-persist ipp.txt# Configure server mode for ethernet bridging.# You must first use your OS's bridging capability# to bridge the TAP interface with the ethernet# NIC interface. Then you must manually set the# IP/netmask on the bridge interface, here we# assume 10.8.0.4/255.255.255.0. Finally we# must set aside an IP range in this subnet# (start=10.8.0.50 end=10.8.0.100) to allocate# to connecting clients. Leave this line commented# out unless you are ethernet bridging.;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100# Configure server mode for ethernet bridging# using a DHCP-proxy, where clients talk# to the OpenVPN server-side DHCP server# to receive their IP address allocation# and DNS server addresses. You must first use# your OS's bridging capability to bridge the TAP# interface with the ethernet NIC interface.# Note: this mode only works on clients (such as# Windows), where the client-side TAP adapter is# bound to a DHCP client.;server-bridge# Push routes to the client to allow it# to reach other private subnets behind# the server. Remember that these# private subnets will also need# to know to route the OpenVPN client# address pool (10.8.0.0/255.255.255.0)# back to the OpenVPN server.push "route 192.168.1.0 255.255.255.0";push "route 192.168.20.0 255.255.255.0"# To assign specific IP addresses to specific# clients or if a connecting client has a private# subnet behind it that should also have VPN access,# use the subdirectory "ccd" for client-specific# configuration files (see man page for more info).# EXAMPLE: Suppose the client# having the certificate common name "Thelonious"# also has a small subnet behind his connecting# machine, such as 192.168.40.128/255.255.255.248.# First, uncomment out these lines:;client-config-dir cdd;route 192.168.40.128 255.255.255.248# Then create a file ccd/Thelonious with this line:# iroute 192.168.40.128 255.255.255.248# This will allow Thelonious' private subnet to# access the VPN. This example will only work# if you are routing, not bridging, i.e. you are# using "dev tun" and "server" directives.# EXAMPLE: Suppose you want to give# Thelonious a fixed VPN IP address of 10.9.0.1.# First uncomment out these lines:client-config-dir ccdroute 10.8.0.5 255.255.255.0# Then add this line to ccd/Thelonious:#ifconfig-push 10.8.0.2 10.8.0.3# Suppose that you want to enable different# firewall access policies for different groups# of clients. There are two methods:# (1) Run multiple OpenVPN daemons, one for each# group, and firewall the TUN/TAP interface# for each group/daemon appropriately.# (2) (Advanced) Create a script to dynamically# modify the firewall in response to access# from different clients. See man# page for more info on learn-address script.;learn-address ./script# If enabled, this directive will configure# all clients to redirect their default# network gateway through the VPN, causing# all IP traffic such as web browsing and# and DNS lookups to go through the VPN# (The OpenVPN server machine may need to NAT# or bridge the TUN/TAP interface to the internet# in order for this to work properly).;push "redirect-gateway def1 bypass-dhcp"# Certain Windows-specific network settings# can be pushed to clients, such as DNS# or WINS server addresses. CAVEAT:# http://openvpn.net/faq.html#dhcpcaveats# The addresses below refer to the public# DNS servers provided by opendns.com.;push "dhcp-option DNS 208.67.222.222";push "dhcp-option DNS 208.67.220.220"# Uncomment this directive to allow different# clients to be able to "see" each other.# By default, clients will only see the server.# To force clients to only see the server, you# will also need to appropriately firewall the# server's TUN/TAP interface.#client-to-client# Uncomment this directive if multiple clients# might connect with the same certificate/key# files or common names. This is recommended# only for testing purposes. For production use,# each client should have its own certificate/key# pair.## IF YOU HAVE NOT GENERATED INDIVIDUAL# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,# EACH HAVING ITS OWN UNIQUE "COMMON NAME",# UNCOMMENT THIS LINE OUT.;duplicate-cn# The keepalive directive causes ping-like# messages to be sent back and forth over# the link so that each side knows when# the other side has gone down.# Ping every 10 seconds, assume that remote# peer is down if no ping received during# a 120 second time period.keepalive 10 120# For extra security beyond that provided# by SSL/TLS, create an "HMAC firewall"# to help block DoS attacks and UDP port flooding.## Generate with:# openvpn --genkey --secret ta.key## The server and each client must have# a copy of this key.# The second parameter should be '0'# on the server and '1' on the clients.#tls-auth ta.key 0 # This file is secret# Select a cryptographic cipher.# This config item must be copied to# the client config file as well.# Note that v2.4 client/server will automatically# negotiate AES-256-GCM in TLS mode.# See also the ncp-cipher option in the manpagecipher AES-256-CBC# Enable compression on the VPN link and push the# option to the client (v2.4+ only, for earlier# versions see below);compress lz4-v2;push "compress lz4-v2"# For compression compatible with older clients use comp-lzo# If you enable it here, you must also# enable it in the client config file.;comp-lzo# The maximum number of concurrently connected# clients we want to allow.;max-clients 100# It's a good idea to reduce the OpenVPN# daemon's privileges after initialization.## You can uncomment this out on# non-Windows systems.;user nobody;group nobody# The persist options will try to avoid# accessing certain resources on restart# that may no longer be accessible because# of the privilege downgrade.persist-keypersist-tun# Output a short status file showing# current connections, truncated# and rewritten every minute.status openvpn-status.log# By default, log messages will go to the syslog (or# on Windows, if running as a service, they will go to# the "\Program Files\OpenVPN\log" directory).# Use log or log-append to override this default.# "log" will truncate the log file on OpenVPN startup,# while "log-append" will append to it. Use one# or the other (but not both).;log openvpn.log;log-append openvpn.log# Set the appropriate level of log# file verbosity.## 0 is silent, except for fatal errors# 4 is reasonable for general usage# 5 and 6 can help to debug connection problems# 9 is extremely verboseverb 3# Silence repeating messages. At most 20# sequential messages of the same message# category will be output to the log.;mute 20# Notify the client that when the server restarts so it# can automatically reconnect.explicit-exit-notify 1# TEST Managementmanagement 0.0.0.0 5555#client-connect script/connect.bat#client-disconnect script/connect.bat

brupala · Answer

Salut,
une connexion réseau c'est toujours des échanges dans les deux sens quelle que soit l'origine de la connexion.
vérifie que tu n'as pas un parefeu sur le client qui bloque les connexions entrantes sur le  PC.

Antoine_33 · Answer

Le parefeu est bien désactivé.

Antoine_33 · Answer

Comment puis-je vérifier ce paramètre ?

Antoine_33 · Answer

Lorsque je ping le serveur depuis le client cela fonctionne. Hors quand depuis le serveur je ping le client je n'ais pas de réponse.
Ping client to serveur :
Oui je sais ce qu'est un ping est je connais les adresses IP du serveur et du client. 

Ping serveur to client :

Antoine_33 · Answer

Effectivement je ping sur le lan mais lorsque je ping l'adresse 10.8... j'ai le même résultat

Antoine_33 · Answer

Voici le résultat:

Antoine_33 · Answer

L'adresse du serveur est 10.8.0.1/30
L'adresse du client est 10.8.0.41/30

Mais ce que je ne comprends pas c'est que dans la config j'utilise le ccd. Dans ce répertoire j'ai créer un fichier au nom de l'utilisateur qui indique sont adresse est la route :

ifconfig-push 10.8.0.41 10.8.0.41
iroute 10.8.0.41 255.255.255.0

Antoine_33 · Answer

Dans le fichier de config je suis deja censé être en /24 à moins que je louche (ce qui est fort possible) :



;local a.b.c.d
port 1194
;proto tcp
proto udp
;dev tap
dev tun

;dev-node MyTap

ca "C:\Program Files\OpenVPN\config\ca.crt"
cert "C:\Program Files\OpenVPN\config\certificat_pour_serveur.crt"
key "C:\Program Files\OpenVPN\config\certificat_pour_serveur.key"  # This file should be kept secret

dh "C:\Program Files\OpenVPN\config\dh2048.pem"

;topology subnet

server 10.8.0.0 255.255.255.0

ifconfig-pool-persist ipp.txt

;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100


;server-bridge

push "route 192.168.1.0 255.255.255.0"
;push "route 192.168.20.0 255.255.255.0"


;client-config-dir cdd
;route 192.168.40.128 255.255.255.248

client-config-dir ccd
route 10.8.0.5 255.255.255.0

;learn-address ./script

;push "redirect-gateway def1 bypass-dhcp"

;push "dhcp-option DNS 208.67.222.222"
;push "dhcp-option DNS 208.67.220.220"


;duplicate-cn


keepalive 10 120

cipher AES-256-CBC

;compress lz4-v2
;push "compress lz4-v2"

;comp-lzo


;max-clients 100

;user nobody
;group nobody

persist-key
persist-tun

status openvpn-status.log

;log         openvpn.log
;log-append  openvpn.log

verb 3

;mute 20

explicit-exit-notify 1


# TEST Management
management 0.0.0.0 5555


#client-connect script/connect.bat
#client-disconnect script/connect.bat

Antoine_33 · Answer

Voici la config coté serveur (j'ai intégrée directement les certificats dans le fichier config) client dev tun proto udp remote intranet.malta-informatique.fr 1194 resolv-retry infinite nobind persist-key persist-tun -----END CERTIFICATE----- -----BEGIN PRIVATE KEY----- /key> remote-cert-tls server cipher AES-256-CBC verb 3 ;mute 20

Antoine_33 · Answer

Merci d'avoir éditer mais comme c'est juste un serveur test ce n'ais pas très grave. Les adresses en 10.8.8.4X je les est définit. Pour chaque client grâce au ccd ont peut définir une adresse IP statique.

Antoine_33 · Answer

Oui mais pour une raison particulière ont a besoin d'adresses statique et je sais bien que ce ne sont pas les meilleures adresses mais comme je l'ai dit si dessus il s'agit d'une VM test.

Antoine_33 · Answer

c'est a dire ?

Antoine_33 · Answer

Je comprends mais il ce trouve que j'ai déjà fais le test sur un ordinateur portable sur un lan différent est j'obtiens le même résultat.

Antoine_33 · Answer

Il y a les screens de toutes les configs ci-dessus. Elles sont toutes en 10.8.0.xx

Antoine_33 · Answer

en 4x et j'ai également fait le test en 1x

Antoine_33 · Answer

J'ai bien compris mais pour un besoin particulier je doit définir des adresses ip statique

Antoine_33 · Answer

J'ai bien compris cela. Dans le fichier conf je les est déclarées en /24

Antoine_33 · Answer

Pour definir l'adresse ip on creér un dossier qui ce nomme ccd. Dans ce dossier on céer un fichier dans lequel pour chaque client ont définit une adresse. Pour mon client j'ai définit 10.8.0.41 255.255.255.0 comme le montre la conf ci-dessus

Antoine_33 · Answer

Je sais bien cela n'apparais pas dans le route print hors lorsque je fais un ipconfig/all j'ai bien la bonne adresse. Comme vous le disiez je pense que ce sont les routes qui ne sont pas bonne hors après plusieurs test je ne vois pas comment les rétablir ni pourquoi une route avec une adresse en /30 apparaît alors que je n'ai indiqué nul part une adresse en /30.

Antoine_33 · Answer

Dans la config serveur on ajoute le paramètre ccd (j'ai épurer le fichier config):

port 1194
proto udp
dev tun
ca "C:\Program Files\OpenVPN\config\ca.crt"
cert "C:\Program Files\OpenVPN\config\certificat_pour_serveur.crt"
key "C:\Program Files\OpenVPN\config\certificat_pour_serveur.key"  # This file should be kept secret
dh "C:\Program Files\OpenVPN\config\dh2048.pem"
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
ifconfig 10.8.0.1 255.255.255.0
push "route 10.8.0.0 255.255.255.0 10.8.0.1"
client-config-dir ccd
keepalive 10 120
cipher AES-256-CBC
persist-key
persist-tun
status openvpn-status.log
verb 3
explicit-exit-notify 1


Ensuite ont créer un dossier qui ce nomme CCD dans lequel on nomme un fichier comme le comon name du client. Dans ce fichier j'ai mis :

ifconfig-push 10.8.1.41 10.8.1.41
iroute 10.8.0.41 255.255.255.0

Antoine_33 · Answer

merci j'attends de t'es nouvelles.

cordialement

Antoine_33 · Answer

C'est bon j'ai résolu mon problème. Par défaut peut importe l'adresse qu'on attribue dans les fichiers conf, openvpn ce mais automatiquement en subnet/30.

Il faut donc ajouter :

topology subnet
server 10.8.0.0 255.255.255.0 

https://community.openvpn.net/openvpn/wiki/Topology?__cf_chl_jschl_tk__=40ea8201a88417c80e3087351283986ae9d2ee8a-1596800652-0-AWbrj5p2qBXkUOOnD44vkbm4wdNQVVGHW8uVhOTMUtGNKu5cZd8Iw-c6xbpJZwbLkECx-UF2YE5676IPhEb83TxJWmXUIQB2r1yGC88i3pxqLzvqFbYzTQGy7LhXjS-8eCECU4OY9q046j7N5nO-H9Uu8E_SewemCvI9E2G10qPma6H3ucE9ZWsYHZJSR0tbx-hHQphxYSaO2EUVMHnKFxARaY5hQXM7k71ZhIf9kHJFGUeUqLT8IkxdAxVpPV75j1wMifjQhJT3mL6Qc1SPyC5jg6c-ExmGaZWyw_doC-4w

Antoine_33 · Answer

Je te remercie pour ton aide, t'es conseille et t'as réactivités 

Cordialement

Un apprenti ; )

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