Maybe a NAT issue

Fri Mar 21 02:08:46 EDT 2014

Hi,
I installed ocserv 0.3.2, and use anyconnect.app on iPhone to connect to it. 
The connection goes well, but I can not get data through the server. 

I also tried with no route defined, which equals 0.0.0.0/0.0.0.0  .  This time, I can’t access any website on my phone…

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I have tried these commands:

sysctl -w net.ipv4.ip_forward=1

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

iptables -I INPUT -j ACCEPT

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But it still doesn’t work…

Here is my config file:

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# User authentication method. Could be set multiple times and in that case
# all should succeed.
# Options: certificate, pam.
#auth = "certificate"
auth = "plain[/etc/ocserv/pwd]"
#auth = "pam"

# The plain option requires specifying a password file which contains
# entries of the following format.
# "username:groupname:encoded-password"
# One entry must be listed per line, and 'ocpasswd' can be used
# to generate password entries.
#auth = "plain[/etc/ocserv/ocpasswd]"

# A banner to be displayed on clients
#banner = "Welcome"

# Use listen-host to limit to specific IPs or to the IPs of a provided
# hostname.
#listen-host = [IP|HOSTNAME]

# Limit the number of clients. Unset or set to zero for unlimited.
#max-clients = 1024
max-clients = 0

# Limit the number of client connections to one every X milliseconds
# (X is the provided value). Set to zero for no limit.
#rate-limit-ms = 100

# Limit the number of identical clients (i.e., users connecting
# multiple times). Unset or set to zero for unlimited.
max-same-clients = 2

# TCP and UDP port number
tcp-port = 443
udp-port = 443

# Keepalive in seconds
keepalive = 32400

# Dead peer detection in seconds.
dpd = 240

# Dead peer detection for mobile clients. The needs to
# be much higher to prevent such clients being awaken too
# often by the DPD messages, and save battery.
# (clients that send the X-AnyConnect-Identifier-DeviceType)
mobile-dpd = 1800

# MTU discovery (DPD must be enabled)
try-mtu-discovery = true

# The key and the certificates of the server
# The key may be a file, or any URL supported by GnuTLS (e.g.,
# tpmkey:uuid=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx;storage=user
# or pkcs11:object=my-vpn-key;object-type=private)
#
# There may be multiple certificate and key pairs and each key
# should correspond to the preceding certificate.
server-cert = /etc/ssl/certs/server-cert.pem
server-key = /etc/ssl/private/server-key.pem

# Diffie-Hellman parameters. Only needed if you require support
# for the DHE ciphersuites (by default this server supports ECDHE).
# Can be generated using:
# certtool --generate-dh-params --outfile /path/to/dh.pem
#dh-params = /path/to/dh.pem

# If you have a certificate from a CA that provides an OCSP
# service you may provide a fresh OCSP status response within
# the TLS handshake. That will prevent the client from connecting
# independently on the OCSP server.
# You can update this response periodically using:
# ocsptool --ask --load-cert=your_cert --load-issuer=your_ca --outfile response
# Make sure that you replace the following file in an atomic way.
#ocsp-response = /path/to/ocsp.der

# In case PKCS #11 or TPM keys are used the PINs should be available
# in files. The srk-pin-file is applicable to TPM keys only, and is the
# storage root key.
#pin-file = /path/to/pin.txt
#srk-pin-file = /path/to/srkpin.txt

# The Certificate Authority that will be used to verify
# client certificates (public keys) if certificate authentication
# is set.

# The object identifier that will be used to read the user ID in the client
# certificate. The object identifier should be part of the certificate's DN
# Useful OIDs are:
#  CN = 2.5.4.3, UID = 0.9.2342.19200300.100.1.1
#cert-user-oid = 0.9.2342.19200300.100.1.1

# The object identifier that will be used to read the user group in the
# client  certificate. The object identifier should be part of the certificate's
# DN. Useful OIDs are:
#  OU (organizational unit) = 2.5.4.11
#cert-group-oid = 2.5.4.11

# The revocation list of the certificates issued by the 'ca-cert' above.
#crl = /path/to/crl.pem

# GnuTLS priority string
tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT"

# To enforce perfect forward secrecy (PFS) on the main channel.
#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA"

# The time (in seconds) that a client is allowed to stay connected prior
# to authentication
auth-timeout = 40

# The time (in seconds) that a client is allowed to stay idle (no traffic)
# before being disconnected. Unset to disable.
#idle-timeout = 1200

# The time (in seconds) that a mobile client is allowed to stay idle (no
# traffic) before being disconnected. Unset to disable.
#mobile-idle-timeout = 2400

# The time (in seconds) that a client is not allowed to reconnect after
# a failed authentication attempt.
#min-reauth-time = 2

# Cookie validity time (in seconds)
# Once a client is authenticated he's provided a cookie with
# which he can reconnect. This option sets the maximum lifetime
# of that cookie.
cookie-validity = 86400

# ReKey time (in seconds)
# ocserv will ask the client to refresh keys periodically once
# this amount of seconds is elapsed. Set to zero to disable.
rekey-time = 172800

# ReKey method
# Valid options: ssl, new-tunnel
#  ssl: Will perform an efficient rehandshake on the channel allowing
#       a seamless connection during rekey.
#  new-tunnel: Will instruct the client to discard and re-establish the channel.
#       Use this option only if the connecting clients have issues with the ssl
#       option.
rekey-method = ssl

# Script to call when a client connects and obtains an IP
# Parameters are passed on the environment.
# REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client),
# DEVICE, IP_REAL (the real IP of the client), IP_LOCAL (the local IP
# in the P-t-P connection), IP_REMOTE (the VPN IP of the client),
# ID (a unique numeric ID); REASON may be "connect" or "disconnect".
#connect-script = /usr/bin/myscript
#disconnect-script = /usr/bin/myscript

# UTMP
use-utmp = true

# D-BUS usage. If disabled occtl tool cannot be used. If enabled
# then ocserv must have access to register org.infradead.ocserv
# D-BUS service. See doc/dbus/org.infradead.ocserv.conf
use-dbus = true

# PID file. It can be overriden in the command line.
pid-file = /var/run/ocserv.pid

# The default server directory. Does not require any devices present.
#chroot-dir = /path/to/chroot

# socket file used for IPC, will be appended with .PID
# It must be accessible within the chroot environment (if any)
socket-file = /var/run/ocserv-socket

# The user the worker processes will be run as. It should be
# unique (no other services run as this user).
run-as-user = nobody
run-as-group = nogroup

# Set the protocol-defined priority (SO_PRIORITY) for packets to
# be sent. That is a number from 0 to 6 with 0 being the lowest
# priority. Alternatively this can be used to set the IP Type-
# Of-Service, by setting it to a hexadecimal number (e.g., 0x20).
# This can be set per user/group or globally.
#net-priority = 3

# Set the VPN worker process into a specific cgroup. This is Linux
# specific and can be set per user/group or globally.
#cgroup = "cpuset,cpu:test"

#
# Network settings
#

# The name of the tun device
device = vpns

# The default domain to be advertised
default-domain = example.com

# The pool of addresses that leases will be given from.
ipv4-network = 192.168.1.0
ipv4-netmask = 255.255.255.0

# The advertized DNS server. Use multiple lines for
# multiple servers.
# dns = fc00::4be0
dns = 8.8.8.8

# The NBNS server (if any)
#nbns = 192.168.1.3

# The IPv6 subnet that leases will be given from.
#ipv6-network = fc00::
#ipv6-prefix = 16

# The domains over which the provided DNS should be used. Use
# multiple lines for multiple domains.
#split-dns = example.com

# Prior to leasing any IP from the pool ping it to verify that
# it is not in use by another (unrelated to this server) host.
ping-leases = false

# Unset to assign the default MTU of the device
# mtu =

# Unset to enable bandwidth restrictions (in bytes/sec). The
# setting here is global, but can also be set per user or per group.
#rx-data-per-sec = 40000
#tx-data-per-sec = 40000

# The number of packets (of MTU size) that are available in
# the output buffer. The default is low to improve latency.
# Setting it higher will improve throughput.
output-buffer = 10

# Routes to be forwarded to the client. If you need the
# client to forward routes to the server, you may use the
# config-per-user/group or even connect and disconnect scripts.
#
# To set the server as the default gateway for the client just
# comment out all routes from the server.
#route = 192.168.1.0/255.255.255.0
#route = 192.168.5.0/255.255.255.0
#route = fef4:db8:1000:1001::/64

# Configuration files that will be applied per user connection or
# per group. Each file name on these directories must match the username
# or the groupname.
# The options allowed in the configuration files are dns, nbns,
#  ipv?-network, ipv4-netmask, ipv6-prefix, rx/tx-per-sec, iroute, route,
#  net-priority and cgroup.
#
# Note that the 'iroute' option allows to add routes on the server
# based on a user or group. The syntax depends on the input accepted
# by the commands route-add-cmd and route-del-cmd (see below).

#config-per-user = /etc/ocserv/config-per-user/
#config-per-group = /etc/ocserv/config-per-group/

# The system command to use to setup a route. %R will be replaced with the
# route/mask and %D with the (tun) device.
#
# The following example is from linux systems. %R should be something
# like 192.168.2.0/24

#route-add-cmd = "ip route add %R dev %D"
#route-del-cmd = "ip route delete %R dev %D"

#
# The following options are for (experimental) AnyConnect client
# compatibility.

# Client profile xml. A sample file exists in doc/profile.xml.
# This file must be accessible from inside the worker's chroot.
# It is not used by the openconnect client.
#user-profile = profile.xml

# Binary files that may be downloaded by the CISCO client. Must
# be within any chroot environment.
#binary-files = /path/to/binaries

# Unless set to false it is required for clients to present their
# certificate even if they are authenticating via a previously granted
# cookie and complete their authentication in the same TCP connection.
# Legacy CISCO clients do not do that, and thus this option should be
# set for them.
#cisco-client-compat = false

#Advanced options

# Option to allow sending arbitrary custom headers to the client after
# authentication and prior to VPN tunnel establishment.

route = 3.0.0.0/255.0.0.0
route = 4.0.0.0/255.0.0.0
route = 8.0.0.0/255.0.0.0
route = 198.0.0.0/255.0.0.0
route = 209.0.0.0/255.0.0.0
route = 210.0.0.0/255.0.0.0
route = 216.0.0.0/255.0.0.0
route = 61.0.0.0/255.0.0.0
route = 64.0.0.0/255.0.0.0
route = 66.0.0.0/255.0.0.0
route = 70.0.0.0/255.0.0.0
route = 72.0.0.0/255.0.0.0
route = 74.0.0.0/255.0.0.0
route = 173.0.0.0/255.0.0.0
route = 204.0.0.0/255.0.0.0
route = 69.0.0.0/255.0.0.0
route = 199.0.0.0/255.0.0.0
route = 203.0.0.0/255.0.0.0
route = 31.0.0.0/255.0.0.0

#custom-header = "X-My-Header: hi there”

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The log output from ocserv:

root@(none):/etc/ocserv# ocserv -fd 1 -c ocserv.conf
listening (TCP) on 0.0.0.0:443...
listening (TCP) on [::]:443...
listening (UDP) on 0.0.0.0:443...
listening (UDP) on [::]:443...
ocserv[16755]: main: initialized ocserv 0.3.2
ocserv[16756]: sec-mod initialized (socket: /var/run/ocserv-socket.16755)
ocserv[16757]: worker: 114.242.249.136:49837 accepted connection
ocserv[16756]: sec-mod received request from pid 16757 and uid 65534
ocserv[16757]: worker: 114.242.249.136:49837 sending message 'resume data store request' to main
ocserv[16757]: worker: 114.242.249.136:49837 TLS handshake completed
ocserv[16755]: main: 114.242.249.136:49837 main received message 'resume data store request' of 258 bytes
ocserv[16755]: main: 114.242.249.136:49837 TLS session DB storing 370dbc147d686005ecba7fcdc572ae971e08ce49eb56fbea454a8e92989b7952
ocserv[16757]: worker: 114.242.249.136:49837 cannot find username in client XML message
ocserv[16757]: worker: 114.242.249.136:49837 failed reading username
ocserv[16757]: worker: 114.242.249.136:49837 sent sid: oOXMmwTyvI0p96y+
ocserv[16757]: worker: 114.242.249.136:49837 received sid: oOXMmwTyvI0p96y+
ocserv[16757]: worker: 114.242.249.136:49837 sending message 'auth init' to main
ocserv[16755]: main: 114.242.249.136:49837 main received message 'auth init' of 15 bytes
ocserv[16755]: main: 114.242.249.136:49837 auth init for user 'rankjie' from '114.242.249.136:49837'
ocserv[16755]: main: 114.242.249.136:49837 sending message 'auth reply' to worker
ocserv[16757]: worker: 114.242.249.136:49837 received auth reply message (value: 2)
ocserv[16757]: worker: 114.242.249.136:49837 continuing authentication for ''
ocserv[16757]: worker: 114.242.249.136:49837 received sid: oOXMmwTyvI0p96y+
ocserv[16757]: worker: 114.242.249.136:49837 sending message 'auth request' to main
ocserv[16755]: main: 114.242.249.136:49837 main received message 'auth request' of 10 bytes
ocserv[16755]: main: 114.242.249.136:49837 auth req for user 'rankjie'
ocserv[16755]: main: 114.242.249.136:49837 accepting user 'rankjie'
ocserv[16755]: main: 114.242.249.136:49837 auth deinit for user 'rankjie'
ocserv[16755]: main: 114.242.249.136:49837 selected IP for 'rankjie': 192.168.1.144
ocserv[16755]: main: 114.242.249.136:49837 assigned IPv4 to 'rankjie': 192.168.1.145
ocserv[16755]: main: 114.242.249.136:49837 assigning tun device vpns0
ocserv[16755]: main: 114.242.249.136:49837 user 'rankjie' of group '[unknown]' authenticated
ocserv[16755]: main: 114.242.249.136:49837 sending (socket) message 2 to worker
ocserv[16757]: worker: 114.242.249.136:49837 received auth reply message (value: 1)
ocserv[16757]: worker: 114.242.249.136:49837 user 'rankjie' logged in
ocserv[16765]: worker: 114.242.249.136:49838 accepted connection
ocserv[16756]: sec-mod received request from pid 16765 and uid 65534
ocserv[16765]: worker: 114.242.249.136:49838 sending message 'resume data store request' to main
ocserv[16765]: worker: 114.242.249.136:49838 TLS handshake completed
ocserv[16755]: main: 114.242.249.136:49838 main received message 'resume data store request' of 278 bytes
ocserv[16755]: main: 114.242.249.136:49838 TLS session DB storing bfb58e4c8272fd942edb32c5ea070e7d8529ff735bf931394fcb177a446a5b55
ocserv[16765]: worker: 114.242.249.136:49838 unexpected URL /+CSCOT+/translation-table?type=combined-manifest&textdomain=AnyConnect
ocserv[16755]: main: 114.242.249.136:49838 main-misc.c:487: command socket closed
ocserv[16755]: main: 114.242.249.136:49838 removing client '' with id '16765'
ocserv[16766]: worker: 114.242.249.136:49839 accepted connection
ocserv[16756]: sec-mod received request from pid 16766 and uid 65534
ocserv[16766]: GnuTLS error (at worker-vpn.c:691): A TLS fatal alert has been received.: CA is unknown
ocserv[16755]: main: 114.242.249.136:49839 main-misc.c:487: command socket closed
ocserv[16755]: main: 114.242.249.136:49839 removing client '' with id '16766'
ocserv[16767]: worker: 114.242.249.136:49840 accepted connection
ocserv[16756]: sec-mod received request from pid 16767 and uid 65534
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'resume data store request' to main
ocserv[16767]: worker: 114.242.249.136:49840 TLS handshake completed
ocserv[16755]: main: 114.242.249.136:49840 main received message 'resume data store request' of 258 bytes
ocserv[16755]: main: 114.242.249.136:49840 TLS session DB storing 119d90232ea53289c98711695a9495ed834792d542f165f3ec7a1358b82ab950
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'auth cookie request' to main
ocserv[16755]: main: 114.242.249.136:49840 main received message 'auth cookie request' of 261 bytes
ocserv[16755]: main: 114.242.249.136:49840 accepting user 'rankjie'
ocserv[16755]: main: 114.242.249.136:49840 auth deinit for user 'rankjie'
ocserv[16755]: main: 114.242.249.136:49837 disconnecting 'rankjie' due to new cookie connection
ocserv[16755]: main: 114.242.249.136:49840 assigned IPv4 to 'rankjie': 192.168.1.145
ocserv[16755]: main: 114.242.249.136:49840 assigning tun device vpns1
ocserv[16755]: main: 114.242.249.136:49840 user 'rankjie' of group '[unknown]' re-authenticated (using cookie)
ocserv[16755]: main: 114.242.249.136:49840 sending (socket) message 2 to worker
ocserv[16767]: worker: 114.242.249.136:49840 received auth reply message (value: 1)
ocserv[16767]: worker: 114.242.249.136:49840 suggesting DPD of 1800 secs
ocserv[16767]: worker: 114.242.249.136:49840 sending IPv4 192.168.1.145
ocserv[16767]: worker: 114.242.249.136:49840 adding route 3.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 4.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 8.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 198.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 209.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 210.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 216.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 61.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 64.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 66.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 70.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 72.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 74.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 173.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 204.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 69.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 199.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 203.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 adding route 31.0.0.0/255.0.0.0
ocserv[16767]: worker: 114.242.249.136:49840 peer's CSTP MTU is 1356 (ignored)
ocserv[16767]: worker: 114.242.249.136:49840 TCP MSS is 1397
ocserv[16767]: worker: 114.242.249.136:49840 reducing MTU due to TCP MSS to 1389
ocserv[16767]: worker: 114.242.249.136:49840 DTLS ciphersuite: AES128-SHA
ocserv[16767]: worker: 114.242.249.136:49840 peer's DTLS MTU is 1356 (overhead: 95)
ocserv[16767]: worker: 114.242.249.136:49840 suggesting DTLS MTU 1323
ocserv[16767]: worker: 114.242.249.136:49840 suggesting CSTP MTU 1323
ocserv[16767]: worker: 114.242.249.136:49840 plaintext MTU is 1388
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'tun mtu change' to main
ocserv[16767]: worker: 114.242.249.136:49840 setting MTU to 1388
ocserv[16755]: main: 114.242.249.136:49840 main received message 'tun mtu change' of 3 bytes
ocserv[16755]: main: 114.242.249.136:49840 setting vpns1 MTU to 1388
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'session info' to main
ocserv[16755]: main: 114.242.249.136:49840 main received message 'session info' of 51 bytes
ocserv[16755]: main: 114.242.249.136:49837 main-misc.c:487: command socket closed
ocserv[16755]: main: 114.242.249.136:49837 removing client 'rankjie' with id '16757'
ocserv[16755]: main: DTLS record version: 1.0
ocserv[16755]: main: DTLS hello version: 1.0
ocserv[16755]: main: 114.242.249.136:49840 sending (socket) message 10 to worker
ocserv[16755]: main: 114.242.249.136:49840 passed UDP socket
ocserv[16767]: worker: 114.242.249.136:49840 reducing MTU due to TCP MSS to 1368
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'tun mtu change' to main
ocserv[16767]: worker: 114.242.249.136:49840 setting MTU to 1367
ocserv[16755]: main: 114.242.249.136:49840 main received message 'tun mtu change' of 3 bytes
ocserv[16767]: worker: 114.242.249.136:49840 worker received message udp fd of 0 bytes
ocserv[16767]: worker: 114.242.249.136:49840 received new UDP fd and connected to peerocserv[16755]: main: 114.242.249.136:49840 setting vpns1 MTU to 1367

ocserv[16767]: worker: 114.242.249.136:49840 setting up DTLS connection
ocserv[16767]: worker: 114.242.249.136:49840 sending message 'tun mtu change' to main
ocserv[16767]: worker: 114.242.249.136:49840 setting MTU to 1302
ocserv[16767]: worker: 114.242.249.136:49840 DTLS handshake completed (plaintext MTU: 1302)
ocserv[16755]: main: 114.242.249.136:49840 main received message 'tun mtu change' of 3 bytes
ocserv[16755]: main: 114.242.249.136:49840 setting vpns1 MTU to 1302