The workaround was required for the "net30" topology because:
"There is a problem in your selection of --ifconfig endpoints [local=192.168.30.10, remote=192.168.30.1]. The local and remote VPN endpoints must exist within the same 255.255.255.252 subnet. This is a limitation of --dev tun when used with the TAP-WIN32 driver. Try 'openvpn --show-valid-subnets' option for more info."
See https://community.openvpn.net/openvpn/wiki/Topology for detailed info.
[src/Cedar/Interop_OpenVPN.c:2711]: (style) Variable 'now' is assigned a value that is never used.
[src/Cedar/Interop_OpenVPN.c:1053]: (style) The function 'OvsAddEntry' is never used.
[src/Cedar/Interop_OpenVPN.c:2610]: (style) The function 'OvsGetCompatibleL3IPNext' is never used.
[src/Cedar/Interop_OpenVPN.c:1047]: (style) The function 'OvsNewList' is never used.
[src/Cedar/Interop_OpenVPN.c:128]: (style) The function 'OvsSetNoOpenVpnTcp' is never used.
[src/Cedar/Interop_OpenVPN.c:140]: (style) The function 'OvsSetNoOpenVpnUdp' is never used.
OpenVPN sends the cipher name in uppercase, even if it's not standard, thus we have to convert it to lowercase for EVP_get_cipherbyname().
We also have to send the cipher name as it was received from the OpenVPN client, unless it's a different cipher, to prevent a message such as:
"WARNING: 'cipher' is used inconsistently, local='cipher AES-128-GCM', remote='cipher aes-128-gcm'"
It happens because OpenVPN uses "strcmp()" to compare the local and remote parameters: a6fd48ba36/src/openvpn/options.c (L3819-L3831)
See https://github.com/openssl/openssl/issues/6921 for EVP_get_cipherbyname().
OpenVPN sends the default gateway's MAC address, if the option --push-peer-info is enabled.
It also sends the client's environment variables whose names start with "UV_".
This commit adds some lines of code in OvsBeginIPCAsyncConnectionIfEmpty(), in order to set the hostname to "UV_HOSTNAME"'s value, which is defined by the user on their device.
In case "UV_HOSTNAME" is not available, "IV_HWADDR"'s value (the default gateway's MAC address) is used instead.
OvsParseOptions() has been adapted into a new function called OvsParsePeerInfo(), in order to parse the peer info string.
* Peer info optional in OvsParseKeyMethod2()
Some OpenVPN clients (MikroTik router for example) do not send the peer info along with the key exchange. This patch makes the peer info string optional on the SoftEtherVPN side.
* Fixed indentation
Buffer overread in ParseL2TPPacket()
Memory corruption in IcmpParseResult
Missing bounds check in ParseUDP() can lead to invalid memory access
Out-of-bounds read in IPsec_PPP.c (unterminated string buffer)
Overlapping parameters to memcpy() via StrToIp6()
PACK ReadValue() crash vulnerability
Potential use of uninitialized memory via IPToInAddr6()
4 memory leaks. While the amount of leakage is very small per time, these bugs can finally cause process crash by out of memory. So these bugs must be fixed.
Memory leak in NnReadDnsRecord
Memory leak in RadiusLogin()
Memory leak via ParsePacketIPv4WithDummyMacHeader
Remote memory leak in OpenVPN server code
1 coding improvement. This is not a bug, however, I fixed the code to avoid furture misunderstanding.
RecvAll can return success on failure (leading to use of uninitialized memory)
Contributors for this bugfix:
- Max Planck Institute for Molecular Genetics
- Guido Vranken
