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Old 08-18-2012, 07:58 PM   #1
cristi92b
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Registered: May 2011
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Setup openvpn server


How can I setup an openvpn server? can you give me some useful links?

I'm using Sabayon 9, x86-64.
 
Old 08-18-2012, 10:40 PM   #2
KinnowGrower
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Openvpn How to
 
Old 08-18-2012, 11:27 PM   #3
cristi92b
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Registered: May 2011
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Thank you!

EDIT:

I can't find the key files:

ca.crt
ca.key
dh2048.pem
server.crt
server.key
client1.crt
client1.key

in /etc/openvpn after
Code:
nano -w vars
Code:
source ./vars
Code:
./build-ca
Code:
./build-dh
Code:
./build-key-server server
Code:
./build-key client1
------------------
Code:
sabayon-home openvpn # openvpn server.conf
Sun Aug 19 07:38:34 2012 OpenVPN 2.1.4 x86_64-pc-linux-gnu [SSL] [LZO2] [EPOLL] [MH] [PF_INET6] built on Feb 16 2011
Sun Aug 19 07:38:34 2012 NOTE: your local LAN uses the extremely common subnet address 192.168.0.x or 192.168.1.x.  Be aware that this might create routing conflicts if you connect to the VPN server from public locations such as internet cafes that use the same subnet.
Sun Aug 19 07:38:34 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Sun Aug 19 07:38:34 2012 Cannot open dh2048.pem for DH parameters: error:02001002:system library:fopen:No such file or directory: error:2006D080:BIO routines:BIO_new_file:no such file
Sun Aug 19 07:38:34 2012 Exiting
Code:
sabayon-home openvpn # ls -a
.                 build-req-pass            list-crl             openvpn-status.log  up.sh
..                clean-all                 loopback-client      pkitool             vars
build-ca          client.conf               loopback-server      README              vpn0.conf.backup
build-dh          down.sh                   Makefile             revoke-full         whichopensslcnf
build-inter       firewall.sh               office.up            server.conf         xinetd-client-config
build-key         home.up                   openssl-0.9.6.cnf    sign-req            xinetd-server-config
build-key-pass    inherit-inter             openssl-0.9.8.cnf    static-home.conf
build-key-pkcs12  ipp.txt                   openssl-1.0.0.cnf    static-office.conf
build-key-server  .keep_net-misc_openvpn-0  openvpn-shutdown.sh  tls-home.conf
build-req         keys                      openvpn-startup.sh   tls-office.conf

Last edited by cristi92b; 08-19-2012 at 12:38 AM.
 
Old 08-19-2012, 02:39 AM   #4
cristi92b
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I guess I have to setup a PKI before the openvpn server so I'll mark the thread as solved.

----------

I generated the keys with openssl but it's not working...

Code:
sabayon-home openvpn # openvpn server.conf
Mon Aug 20 01:04:39 2012 OpenVPN 2.1.4 x86_64-pc-linux-gnu [SSL] [LZO2] [EPOLL] [MH] [PF_INET6] built on Feb 16 2011
Mon Aug 20 01:04:39 2012 NOTE: your local LAN uses the extremely common subnet address 192.168.0.x or 192.168.1.x.  Be aware that this might create routing conflicts if you connect to the VPN server from public locations such as internet cafes that use the same subnet.
Mon Aug 20 01:04:39 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Mon Aug 20 01:04:39 2012 Diffie-Hellman initialized with 2048 bit key
Mon Aug 20 01:04:39 2012 TLS-Auth MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
Mon Aug 20 01:04:39 2012 Socket Buffers: R=[212992->131072] S=[212992->131072]
Mon Aug 20 01:04:39 2012 ROUTE default_gateway=192.168.1.1
Mon Aug 20 01:04:39 2012 TUN/TAP device tun0 opened
Mon Aug 20 01:04:39 2012 TUN/TAP TX queue length set to 100
Mon Aug 20 01:04:39 2012 /sbin/ifconfig tun0 10.8.0.1 pointopoint 10.8.0.2 mtu 1500
Mon Aug 20 01:04:39 2012 Linux ifconfig failed: could not execute external program
Mon Aug 20 01:04:39 2012 Exiting
sabayon-home openvpn #
/etc/openvpn
Code:
sabayon-home openvpn # ls -la
total 232
drwxrwxrwx   3 root   root    4096 Aug 20 00:37 .
drwxr-xr-x 157 root   root   12288 Aug 20 00:09 ..
-rwxr-xr-x   1 root   root     119 Aug 19 06:36 build-ca
-rwxr-xr-x   1 root   root     352 Aug 19 06:36 build-dh
-rwxr-xr-x   1 root   root     188 Aug 19 06:36 build-inter
-rwxr-xr-x   1 root   root     163 Aug 19 06:36 build-key
-rwxr-xr-x   1 root   root     157 Aug 19 06:36 build-key-pass
-rwxr-xr-x   1 root   root     249 Aug 19 06:36 build-key-pkcs12
-rwxr-xr-x   1 root   root     268 Aug 19 06:36 build-key-server
-rwxr-xr-x   1 root   root     213 Aug 19 06:36 build-req
-rwxr-xr-x   1 root   root     158 Aug 19 06:36 build-req-pass
-rwxr-xr-x   1 root   root     428 Aug 19 06:36 clean-all
-rw-r--r--   1 root   root    3473 Aug 20 00:06 client.conf
-rwxr-xr-x   1 root   root     943 Feb 16  2011 down.sh
-rwxr-xr-x   1 root   root    3562 Aug 19 07:13 firewall.sh
-rwxr-xr-x   1 root   root      62 Aug 19 07:13 home.up
-rwxr-xr-x   1 root   root    1457 Aug 19 06:36 inherit-inter
-rw-------   1 root   root       0 Aug 19 07:04 ipp.txt
-rw-r--r--   1 root   root       0 Feb 16  2011 .keep_net-misc_openvpn-0
drwx------   2 root   root    4096 Aug 20 00:41 keys
-rwxr-xr-x   1 root   root     295 Aug 19 06:36 list-crl
-rw-r--r--   1 root   root     639 Aug 19 07:13 loopback-client
-rw-r--r--   1 root   root     665 Aug 19 07:13 loopback-server
-rw-r--r--   1 root   root     413 Aug 19 06:36 Makefile
-rwxr-xr-x   1 root   root      62 Aug 19 07:13 office.up
-rwxr-xr-x   1 root   root    7768 Aug 19 06:36 openssl-0.9.6.cnf
-rwxr-xr-x   1 root   root    8325 Aug 19 06:36 openssl-0.9.8.cnf
-rwxr-xr-x   1 root   root    8222 Aug 19 06:36 openssl-1.0.0.cnf
-rwxr-xr-x   1 root   root      63 Aug 19 07:13 openvpn-shutdown.sh
-rwxr-xr-x   1 root   root     776 Aug 19 07:13 openvpn-startup.sh
-rw-------   1 root   root       0 Aug 20 01:04 openvpn-status.log
-rwxr-xr-x   1 root   root   12675 Aug 19 06:36 pkitool
-rw-r--r--   1 root   root     131 Aug 19 07:13 README
-rwxr-xr-x   1 root   root     918 Aug 19 06:36 revoke-full
-rw-r--r--   1 root   root   10358 Aug 20 00:55 server.conf
-rw-r--r--   1 cristi cristi 10288 Aug 19 11:45 server.conf~
-rwxr-xr-x   1 root   root     178 Aug 19 06:36 sign-req
-rw-r--r--   1 root   root    1742 Aug 19 07:13 static-home.conf
-rw-r--r--   1 root   root    1688 Aug 19 07:13 static-office.conf
-rw-r--r--   1 root   root    1937 Aug 19 07:13 tls-home.conf
-rw-r--r--   1 root   root    1948 Aug 19 07:13 tls-office.conf
-rwxr-xr-x   1 root   root    2594 Feb 16  2011 up.sh
-rwxr-xr-x   1 root   root    1838 Aug 20 00:28 vars
-rw-r--r--   1 root   root      71 Aug 17 17:38 vpn0.conf.backup
-rwxr-xr-x   1 root   root     714 Aug 19 06:36 whichopensslcnf
-rw-r--r--   1 root   root     199 Aug 19 07:13 xinetd-client-config
-rw-r--r--   1 root   root     989 Aug 19 07:13 xinetd-server-config
/etc/openvpn/keys
Code:
sabayon-home keys # ls -la
total 96
drwx------ 2 root root 4096 Aug 20 00:41 .
drwxrwxrwx 3 root root 4096 Aug 20 00:37 ..
-rw-r--r-- 1 root root 5397 Aug 20 00:39 01.pem
-rw-r--r-- 1 root root 5266 Aug 20 00:40 02.pem
-rw-r--r-- 1 root root 1671 Aug 20 00:38 ca.crt
-rw------- 1 root root 1704 Aug 20 00:38 ca.key
-rw-r--r-- 1 root root 5266 Aug 20 00:40 cristi.crt
-rw-r--r-- 1 root root 1098 Aug 20 00:40 cristi.csr
-rw------- 1 root root 1704 Aug 20 00:40 cristi.key
-rw-r--r-- 1 root root  424 Aug 20 00:41 dh2048.pem
-rw-r--r-- 1 root root  252 Aug 20 00:40 index.txt
-rw-r--r-- 1 root root   21 Aug 20 00:40 index.txt.attr
-rw-r--r-- 1 root root   21 Aug 20 00:39 index.txt.attr.old
-rw-r--r-- 1 root root  129 Aug 20 00:39 index.txt.old
-rw-r--r-- 1 root root    3 Aug 20 00:40 serial
-rw-r--r-- 1 root root    3 Aug 20 00:39 serial.old
-rw-r--r-- 1 root root 5397 Aug 20 00:39 server.crt
-rw-r--r-- 1 root root 1106 Aug 20 00:39 server.csr
-rw------- 1 root root 1704 Aug 20 00:39 server.key
/etc/openvpn/server.conf
Code:
#################################################
# 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 tcp
proto 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 tap
dev 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 /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/server.crt
key /etc/openvpn/keys/server.key  # This file should be kept secret

# Diffie hellman parameters.
# Generate your own with:
#   openssl dhparam -out dh1024.pem 1024
# Substitute 2048 for 1024 if you are using
# 2048 bit keys. 
dh /etc/openvpn/keys/dh2048.pem

# 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 192.168.10.0 255.255.255.0"
;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 ccd
;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 ccd
;route 10.9.0.0 255.255.255.252
# Then add this line to ccd/Thelonious:
#   ifconfig-push 10.9.0.1 10.9.0.2

# 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.
;cipher BF-CBC        # Blowfish (default)
;cipher AES-128-CBC   # AES
;cipher DES-EDE3-CBC  # Triple-DES

# Enable compression on the VPN link.
# 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-key
persist-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 verbose
verb 3

# Silence repeating messages.  At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20
-----------------------

After
Code:
sabayon-home openvpn # ln -s /bin/ifconfig /sbin/ifconfig
and

Code:
sabayon-home openvpn # openvpn server.conf
I got

Code:
sabayon-home openvpn # openvpn server.conf
Mon Aug 20 02:14:30 2012 OpenVPN 2.1.4 x86_64-pc-linux-gnu [SSL] [LZO2] [EPOLL] [MH] [PF_INET6] built on Feb 16 2011
Mon Aug 20 02:14:30 2012 NOTE: your local LAN uses the extremely common subnet address 192.168.0.x or 192.168.1.x.  Be aware that this might create routing conflicts if you connect to the VPN server from public locations such as internet cafes that use the same subnet.
Mon Aug 20 02:14:30 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Mon Aug 20 02:14:30 2012 Diffie-Hellman initialized with 2048 bit key
Mon Aug 20 02:14:30 2012 WARNING: file '/etc/openvpn/keys/server.key' is group or others accessible
Mon Aug 20 02:14:30 2012 TLS-Auth MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
Mon Aug 20 02:14:30 2012 Socket Buffers: R=[212992->131072] S=[212992->131072]
Mon Aug 20 02:14:30 2012 ROUTE default_gateway=192.168.1.1
Mon Aug 20 02:14:30 2012 TUN/TAP device tun0 opened
Mon Aug 20 02:14:30 2012 TUN/TAP TX queue length set to 100
Mon Aug 20 02:14:30 2012 /sbin/ifconfig tun0 10.8.0.1 pointopoint 10.8.0.2 mtu 1500
Mon Aug 20 02:14:30 2012 /sbin/route add -net 10.8.0.0 netmask 255.255.255.0 gw 10.8.0.2
Mon Aug 20 02:14:30 2012 ERROR: Linux route add command failed: could not execute external program
Mon Aug 20 02:14:30 2012 Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ]
Mon Aug 20 02:14:30 2012 UDPv4 link local (bound): [undef]
Mon Aug 20 02:14:30 2012 UDPv4 link remote: [undef]
Mon Aug 20 02:14:30 2012 MULTI: multi_init called, r=256 v=256
Mon Aug 20 02:14:30 2012 IFCONFIG POOL: base=10.8.0.4 size=62
Mon Aug 20 02:14:30 2012 IFCONFIG POOL LIST
Mon Aug 20 02:14:30 2012 Initialization Sequence Completed
and it hangs...

That's not bad, but how do I stat the server?

I tried
Code:
sabayon-home openvpn # /etc/init.d/openvpn start
 * Caching service dependencies ...
 * rc_need_vpn0 is deprecated.
 * Please use rc_net_vpn0_need instead.
 * rc_provide_vpn0 is deprecated.
 * Please use rc_net_vpn0_provide instead.                                                                      [ ok ]
 * Starting openvpn ...
grep: /etc/openvpn/openvpn.conf: No such file or directory
grep: /etc/openvpn/openvpn.conf: No such file or directory
grep: /etc/openvpn/openvpn.conf: No such file or directory
grep: /etc/openvpn/openvpn.conf: No such file or directory
Options error: In [CMD-LINE]:1: Error opening configuration file: /etc/openvpn/openvpn.conf
Use --help for more information.
 * start-stop-daemon: failed to start `/usr/sbin/openvpn'
 * Check your logs to see why startup failed                                                                    [ !! ]
 * ERROR: openvpn failed to start
and
Code:
sabayon-home openvpn # ./openvpn-startup.sh
Bad argument `10.0.0.0/24'
Try `iptables -h' or 'iptables --help' for more information.

Last edited by cristi92b; 08-19-2012 at 07:30 PM.
 
  


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