Eu tentei instalar o openvpn no debian squeez (server) e conectar do meu fedora 17 como (client). Aqui está minha configuração:
# Server TCP
proto tcp
port 1194
dev tun
# Keys and certificates
ca /etc/openvpn/easy-rsa/keys/ca.crt
cert /etc/openvpn/easy-rsa/keys/server.crt
key /etc/openvpn/easy-rsa/keys/server.key
dh /etc/openvpn/easy-rsa/keys/dh1024.pem
# Network
# Virtual address of the VPN network
server 192.170.70.0 255.255.255.0
# This line adds the client to the router network server
push "route 192.168.1.0 255.255.255.0"
# Create a route server to the tun interface
#route 192.170.70.0 255.255.255.0
# Security
keepalive 10 120
# type of data encryption
cipher AES-128-CBC
# enabling compression
comp-lzo
# maximum number of clients allowed
max-clients 10
# no user and group specific to the use of the VPN
user nobody
group nogroup
# to make persistent connection
persist-key
persist-tun
# Log of the OpenVPN status
status /var/log/openvpn-status.log
# logs openvpnlog /var/log/openvpn.log
log-append /var/log/openvpn.log
# verbosity
verb 5
client
dev tun
proto tcp-client
remote <my server wan IP> 1194
resolv-retry infinite
cipher AES-128-CBC
# Keys
ca ca.crt
cert client.crt
key client.key
# Security
nobind
persist-key
persist-tun
comp-lzo
verb 3
Mensagem do cliente host (fedora 17) no arquivo de log /var/log/messages :
Dec 6 21:56:00 GlobalTIC NetworkManager[691]: <info> Starting VPN service 'openvpn'...
Dec 6 21:56:00 GlobalTIC NetworkManager[691]: <info> VPN service 'openvpn' started (org.freedesktop.NetworkManager.openvpn), PID 7470
Dec 6 21:56:00 GlobalTIC NetworkManager[691]: <info> VPN service 'openvpn' appeared; activating connections
Dec 6 21:56:00 GlobalTIC NetworkManager[691]: <info> VPN plugin state changed: starting (3)
Dec 6 21:56:01 GlobalTIC NetworkManager[691]: <info> VPN connection 'Connexion VPN 1' (Connect) reply received.
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]: OpenVPN 2.2.2 x86_64-redhat-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] built on Sep 5 2012
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]:[COLOR="Red"][U][B] WARNING: No server certificate verification method has been enabled.[/B][/U][/COLOR] See http://openvpn.net/howto.html#mitm for more info.
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]: NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]:[COLOR="Red"] WARNING: file '/home/login/client/client.key' is group or others accessible[/COLOR]
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]: UDPv4 link local: [undef]
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]: UDPv4 link remote: [COLOR="Red"]<my server wan IP>[/COLOR]:1194
Dec 6 21:56:01 GlobalTIC nm-openvpn[7472]: [COLOR="Red"]read UDPv4 [ECONNREFUSED]: Connection refused (code=111)[/COLOR]
Dec 6 21:56:03 GlobalTIC nm-openvpn[7472]: [COLOR="Red"]read UDPv4[/COLOR] [ECONNREFUSED]: Connection refused (code=111)
Dec 6 21:56:07 GlobalTIC nm-openvpn[7472]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
Dec 6 21:56:15 GlobalTIC nm-openvpn[7472]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
Dec 6 21:56:31 GlobalTIC nm-openvpn[7472]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
Dec 6 21:56:41 GlobalTIC NetworkManager[691]: <warn> VPN connection 'Connexion VPN 1' (IP Conf[/CODE]
ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:16:21:ac
inet addr:192.168.1.6 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe16:21ac/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9059 errors:0 dropped:0 overruns:0 frame:0
TX packets:5660 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:919427 (897.8 KiB) TX bytes:1273891 (1.2 MiB)
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:192.170.70.1 P-t-P:192.170.70.2 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
as0t0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 5.5.0.1 netmask 255.255.252.0 destination 5.5.0.1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 200 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 321 (321.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
as0t1: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 5.5.4.1 netmask 255.255.252.0 destination 5.5.4.1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 200 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 321 (321.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
as0t2: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 5.5.8.1 netmask 255.255.252.0 destination 5.5.8.1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 200 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 321 (321.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
as0t3: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 5.5.12.1 netmask 255.255.252.0 destination 5.5.12.1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 200 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 321 (321.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
**p255p1**: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::21d:baff:fe20:b7e6 prefixlen 64 scopeid 0x20<link>
ether 00:1d:ba:20:b7:e6 txqueuelen 1000 (Ethernet)
RX packets 4842070 bytes 3579798184 (3.3 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3996158 bytes 2436442882 (2.2 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16
e
root@hoteserver:/etc/openvpn# tree
.
├── client
│** ├── ca.crt
│** ├── client.conf
│** ├── client.crt
│** ├── client.csr
│** ├── client.key
│** ├── client.ovpn
│*
│**
├── easy-rsa
│** ├── build-ca
│** ├── build-dh
│** ├── build-inter
│** ├── build-key
│** ├── build-key-pass
│** ├── build-key-pkcs12
│** ├── build-key-server
│** ├── build-req
│** ├── build-req-pass
│** ├── clean-all
│** ├── inherit-inter
│** ├── keys
│** │** ├── 01.pem
│** │** ├── 02.pem
│** │** ├── ca.crt
│** │** ├── ca.key
│** │** ├── client.crt
│** │** ├── client.csr
│** │** ├── client.key
│** │** ├── dh1024.pem
│** │** ├── index.txt
│** │** ├── index.txt.attr
│** │** ├── index.txt.attr.old
│** │** ├── index.txt.old
│** │** ├── serial
│** │** ├── serial.old
│** │** ├── server.crt
│** │** ├── server.csr
│** │** └── server.key
│** ├── list-crl
│** ├── Makefile
│** ├── openssl-0.9.6.cnf.gz
│** ├── openssl.cnf
│** ├── pkitool
│** ├── README.gz
│** ├── revoke-full
│** ├── sign-req
│** ├── vars
│** └── whichopensslcnf
├── openvpn.log
├── openvpn-status.log
├── server.conf
└── update-resolv-conf
[login@hoteclient openvpn]$ tree
.
|-- easy-rsa
| |-- 1.0
| | |-- build-ca
| | |-- build-dh
| | |-- build-inter
| | |-- build-key
| | |-- build-key-pass
| | |-- build-key-pkcs12
| | |-- build-key-server
| | |-- build-req
| | |-- build-req-pass
| | |-- clean-all
| | |-- list-crl
| | |-- make-crl
| | |-- openssl.cnf
| | |-- README
| | |-- revoke-crt
| | |-- revoke-full
| | |-- sign-req
| | '-- vars
| '-- 2.0
| |-- build-ca
| |-- build-dh
| |-- build-inter
| |-- build-key
| |-- build-key-pass
| |-- build-key-pkcs12
| |-- build-key-server
| |-- build-req
| |-- build-req-pass
| |-- clean-all
| |-- inherit-inter
| |-- keys [error opening dir]
| |-- list-crl
| |-- Makefile
| |-- openssl-0.9.6.cnf
| |-- openssl-0.9.8.cnf
| |-- openssl-1.0.0.cnf
| |-- pkitool
| |-- README
| |-- revoke-full
| |-- sign-req
| |-- vars
| '-- whichopensslcnf
|-- keys -> ./easy-rsa/2.0/keys/
'-- server.conf
A origem do problema é cipher AES-128-CBC , proto tcp-client ou UDP ou a interface p255p1 no Fedora17 ou que a autentificação do arquivo ta.key não foi encontrada?
Primeiro, você deve alterar as permissões no seu arquivo /home/login/client/client.key para que não seja grupo ou outras que possam ser acessadas.
chmod 400 /home/login/client/client.key
Depois, conforme descrito aqui , você deve implementar um método para verificar se o seu os clientes se conectam ao servidor correto e não é possível um ataque intermediário.
Há uma lista completa de problemas aqui e você deve levar a sério as advertências dadas pelo OpenVPN. Mas há apenas avisos e não o motivo de seu problema para obter uma conexão.
O plugin openvpn do NetworkManager está tentando se conectar usando o UDP. Eu não sei qual relação o seu client.conf tem para a sua configuração real do cliente. Foi usado para importar as configurações vpn para o NetworkManager?
De qualquer forma você tem que verificar a caixa de seleção de conexão TCP na caixa de diálogo de configurações avançadas do seu perfil de conexão vpn.
Como você não parece usar o tls-auth no cliente nem no servidor, não deve haver nenhum arquivo ta.key (mas usar o tls-auth é uma boa idéia).
A cifra parece ser a mesma em ambos os lados e não deve ser um problema.
Eu realmente sugiro strongmente que verifique o certificado do servidor , como morlix declarou.