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angristan / openvpn-install

Set up your own OpenVPN server on Debian, Ubuntu, Fedora, CentOS or Arch Linux.
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MIT License
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DNS not working on ubuntu 19.10 #532

Closed jgarbora closed 4 years ago

jgarbora commented 4 years ago

package's version: openvpn-systemd-resolved: 1.3.0-3 openvpn: 2.4.7-1ubuntu2

root@xps-13:~# openvpn --version
OpenVPN 2.4.7 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Sep  5 2019
library versions: OpenSSL 1.1.1c  28 May 2019, LZO 2.10
Originally developed by James Yonan
Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
Compile time defines: enable_async_push=no enable_comp_stub=no enable_crypto=yes enable_crypto_ofb_cfb=yes enable_debug=yes enable_def_auth=yes enable_dependency_tracking=no enable_dlopen=unknown enable_dlopen_self=unknown enable_dlopen_self_static=unknown enable_fast_install=needless enable_fragment=yes enable_iproute2=yes enable_libtool_lock=yes enable_lz4=yes enable_lzo=yes enable_maintainer_mode=no enable_management=yes enable_multihome=yes enable_pam_dlopen=no enable_pedantic=no enable_pf=yes enable_pkcs11=yes enable_plugin_auth_pam=yes enable_plugin_down_root=yes enable_plugins=yes enable_port_share=yes enable_selinux=no enable_server=yes enable_shared=yes enable_shared_with_static_runtimes=no enable_silent_rules=no enable_small=no enable_static=yes enable_strict=no enable_strict_options=no enable_systemd=yes enable_werror=no enable_win32_dll=yes enable_x509_alt_username=yes with_aix_soname=aix with_crypto_library=openssl with_gnu_ld=yes with_mem_check=no with_sysroot=no

config file

client
dev tun
proto udp
remote vpn.xxx.com 1194
resolv-retry infinite
nobind
;user nobody
;group nobody
persist-key
persist-tun
ca ca.crt
cert client.crt
key client.key
comp-lzo
;pull dhcp-options

script-security 2
up /etc/openvpn/update-resolv-conf
down /etc/openvpn/update-resolv-conf

starting 

root@xps-13:~# openvpn xxxVPN.ovpn 
Wed Jan  1 12:35:11 2020 OpenVPN 2.4.7 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Sep  5 2019
Wed Jan  1 12:35:11 2020 library versions: OpenSSL 1.1.1c  28 May 2019, LZO 2.10
Wed Jan  1 12:35:11 2020 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Wed Jan  1 12:35:11 2020 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Wed Jan  1 12:35:11 2020 TCP/UDP: Preserving recently used remote address: [AF_INET]18.228.104.124:1194
Wed Jan  1 12:35:11 2020 UDP link local: (not bound)
Wed Jan  1 12:35:11 2020 UDP link remote: [AF_INET]x.x.x.x:1194
Wed Jan  1 12:35:13 2020 [server] Peer Connection Initiated with [AF_INET]18.228.104.124:1194
Wed Jan  1 12:35:14 2020 TUN/TAP device tun0 opened
Wed Jan  1 12:35:14 2020 /sbin/ip link set dev tun0 up mtu 1500
Wed Jan  1 12:35:14 2020 /sbin/ip addr add dev tun0 local 10.99.0.42 peer 10.99.0.41
Wed Jan  1 12:35:14 2020 /etc/openvpn/update-resolv-conf tun0 1500 1553 10.99.0.42 10.99.0.41 init
dhcp-option DNS 10.104.1.130
Wed Jan  1 12:35:19 2020 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Wed Jan  1 12:35:19 2020 Initialization Sequence Completed

resolv.conf after connecting

root@xps-13:~$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 10.104.1.130
nameserver 127.0.0.53
search home tendawifi.com

then some how DNS is resolved

root@xps-13:~# nslookup kibana-teahupoo.aws.xxx.com
Server:     10.104.1.130
Address:    10.104.1.130#53

Non-authoritative answer:
kibana-teahupoo.aws.xxx.com canonical name = kibana-prod.aws.xxx.com.
Name:   kibana-prod.aws.xxx.com
Address: 10.103.4.184

but not for ping

root@xps-13:~# ping kibana-teahupoo.aws.xxx.com
ping: kibana-teahupoo.aws.xxx.com: Name or service not known

or browser

This site can’t be reached kibana-teahupoo.aws.xxx.com’s server IP address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN

systemd-resolve --status

root@xps-13:~$ systemd-resolve --status
Global
       LLMNR setting: no
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
  Current DNS Server: 10.104.1.130
         DNS Servers: 10.104.1.130
          DNS Domain: tendawifi.com
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 3 (tun0)
      Current Scopes: none
DefaultRoute setting: no
       LLMNR setting: yes
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 2 (wlp2s0)
      Current Scopes: DNS
DefaultRoute setting: yes
       LLMNR setting: yes
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
  Current DNS Server: 192.168.5.1
         DNS Servers: 192.168.5.1
          DNS Domain: ~.
                      tendawifi.com

Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.

root@xps-13:/etc/openvpn# systemctl status systemd-resolved.service
● systemd-resolved.service - Network Name Resolution
   Loaded: loaded (/lib/systemd/system/systemd-resolved.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2020-01-02 09:58:48 CET; 25min ago
     Docs: man:systemd-resolved.service(8)
           https://www.freedesktop.org/wiki/Software/systemd/resolved
           https://www.freedesktop.org/wiki/Software/systemd/writing-network-configuration-managers
           https://www.freedesktop.org/wiki/Software/systemd/writing-resolver-clients
 Main PID: 12478 (systemd-resolve)
   Status: "Processing requests..."
    Tasks: 1 (limit: 4915)
   Memory: 3.1M
   CGroup: /system.slice/systemd-resolved.service
           └─12478 /lib/systemd/systemd-resolved

ene 02 10:17:07 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:17:07 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:17:15 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:18:41 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:18:41 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:18:41 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:19:02 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:19:02 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:19:02 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
ene 02 10:19:12 xps-13 systemd-resolved[12478]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.

any clue ? same config is running fine on a debian 10 this is a Ubuntu 19.10

angristan commented 4 years ago

597