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HMAC Error due to wrong package order

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Apr 10th, 2015
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  1. We encountered a really strange behaviour with OpenVPN 2.3.6 on CentOS 5. A device of ours that is behind a SAT Link is having troubles getting through the buildup phase.
  2. For some strange reason it sends the packages not in the right order.
  3. Sometimes it works. But its pure chance and chance varies over the day.
  4. We can rule out firewall or connection issues, as this wrong sent packet order (from client to server) (...15, 17, 16, 17...) is already present in the logs on client side.
  5. If we switch to fiber connection everything is fine.
  6. So for us it seems that some strange circumstance with the SAT Link connection triggers a Bug in OpenVpn and it sends one packge early.
  7.  
  8. So two questions:
  9.  
  10. 1) Why does the client send packet 17 two times and for the first time, too early?
  11.  
  12. 2) Why does the server not wait for the missing package and instead fails instantly with: "Authenticate/Decrypt packet error: packet HMAC authentication failed"?
  13.  
  14. Client Side: Notice PID series: 14, 15, 17, 16, 17, 18
  15.  
  16. ...
  17. Apr 10 17:39:08 client openvpn[1300]: TCPv4_CLIENT WRITE [154] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #41 ] [ 39 ] pid=2 DATA len=100
  18. Apr 10 17:39:08 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #42 ] [ ] pid=3 DATA len=100
  19. Apr 10 17:39:08 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #43 ] [ ] pid=4 DATA len=100
  20. Apr 10 17:39:08 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #44 ] [ ] pid=5 DATA len=100
  21. Apr 10 17:39:09 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #45 ] [ ] pid=6 DATA len=100
  22. Apr 10 17:39:10 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #46 ] [ ] pid=7 DATA len=100
  23. Apr 10 17:39:10 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #47 ] [ ] pid=8 DATA len=100
  24. Apr 10 17:39:10 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #48 ] [ ] pid=9 DATA len=100
  25. Apr 10 17:39:10 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #49 ] [ ] pid=10 DATA len=100
  26. Apr 10 17:39:11 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #50 ] [ ] pid=11 DATA len=100
  27. Apr 10 17:39:11 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #51 ] [ ] pid=12 DATA len=100
  28. Apr 10 17:39:11 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #52 ] [ ] pid=13 DATA len=100
  29. Apr 10 17:39:12 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #53 ] [ ] pid=14 DATA len=100
  30. Apr 10 17:39:12 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #54 ] [ ] pid=15 DATA len=100
  31. Apr 10 17:39:13 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #55 ] [ ] pid=17 DATA len=100
  32. Apr 10 17:39:13 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #56 ] [ ] pid=16 DATA len=100
  33. Apr 10 17:39:13 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #57 ] [ ] pid=17 DATA len=100
  34. Apr 10 17:39:13 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #58 ] [ ] pid=18 DATA len=100
  35. Apr 10 17:39:14 client openvpn[1300]: TCPv4_CLIENT WRITE [142] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_V1 kid=0 pid=[ #59 ] [ ] pid=19 DATA len=100
  36. Apr 10 17:39:20 client openvpn[1300]: TCPv4_CLIENT WRITE [42] to xxx.xxx.xxx.xxx:yyyy: P_CONTROL_HARD_RESET_CLIENT_V2 kid=0 pid=[ #1 ] [ ] pid=0 DATA len=0
  37. Apr 10 17:39:20 client openvpn[1300]: TCPv4_CLIENT READ [54] from xxx.xxx.xxx.xxx:yyyy: P_CONTROL_HARD_RESET_SERVER_V2 kid=0 pid=[ #1 ] [ 0 ] pid=0 DATA len=0
  38.  
  39.  
  40. Server side: Cancels on jump from PID=15 to 17
  41.  
  42. ...
  43. Apr 10 19:39:09 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [154] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #41 ] [ 39 ] pid=2 DATA len=100
  44. Apr 10 19:39:09 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #42 ] [ ] pid=3 DATA len=100
  45. Apr 10 19:39:09 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #43 ] [ ] pid=4 DATA len=100
  46. Apr 10 19:39:09 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #44 ] [ ] pid=5 DATA len=100
  47. Apr 10 19:39:10 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #45 ] [ ] pid=6 DATA len=100
  48. Apr 10 19:39:10 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #46 ] [ ] pid=7 DATA len=100
  49. Apr 10 19:39:11 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #47 ] [ ] pid=8 DATA len=100
  50. Apr 10 19:39:11 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #48 ] [ ] pid=9 DATA len=100
  51. Apr 10 19:39:11 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #49 ] [ ] pid=10 DATA len=100
  52. Apr 10 19:39:12 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #50 ] [ ] pid=11 DATA len=100
  53. Apr 10 19:39:12 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #51 ] [ ] pid=12 DATA len=100
  54. Apr 10 19:39:12 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #52 ] [ ] pid=13 DATA len=100
  55. Apr 10 19:39:13 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #53 ] [ ] pid=14 DATA len=100
  56. Apr 10 19:39:13 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #54 ] [ ] pid=15 DATA len=100
  57. Apr 10 19:39:14 server openvpn[32482]: 192.168.19.253:48396 TCPv4_SERVER READ [142] from 192.168.19.253:48396: P_CONTROL_V1 kid=0 pid=[ #55 ] [ ] pid=17 DATA len=100
  58. Apr 10 19:39:14 server openvpn[32482]: 192.168.19.253:48396 Authenticate/Decrypt packet error: packet HMAC authentication failed
  59.  
  60.  
  61. Server Conf:
  62.  
  63. port yyyy
  64. proto tcp
  65. dev tun
  66. ca ca.crt
  67. tls-auth ta.key 0
  68. cert ______________.com.crt
  69. key ______________.com.key
  70. dh dh2048.pem
  71. server 172.20.0.0 255.255.0.0
  72. client-config-dir clients
  73. ifconfig-pool-persist ipp_server.txt
  74. push "route 172.18.0.0 255.255.0.0"
  75. keepalive 10 60
  76. cipher AES-256-CBC
  77. comp-lzo
  78. max-clients 5000
  79. user nobody
  80. group nobody
  81. persist-key
  82. persist-tun
  83. status status.log
  84. verb 1
  85.  
  86.  
  87. Client COnf:
  88.  
  89. client
  90. dev tun0
  91. proto tcp
  92. remote xxx.xxx.xxx.xxx yyyy
  93. resolv-retry infinite
  94. persist-key
  95. persist-tun
  96. ca ca.crt
  97. cert _________.crt
  98. key _________.key
  99. tls-auth ta.key 1
  100. cipher AES-256-CBC
  101. ns-cert-type server
  102. verb 8
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