Take Windows User "TEMP" variable for $EASYRSA_TEMP_DIR fallback

[TinCanTech]

Signed-off-by: Richard Bonhomme tincanteksup@gmail.com

[TinCanTech]

This generally fixes #412

[TinCanTech]

I forgot to shellcheck it ..

[TinCanTech]

Windows log (With some debugging):

C:\Program Files\OpenVPN\easy-rsa>EasyRSA-Start.bat

Welcome to the EasyRSA 3 Shell for Windows.
Easy-RSA 3 is available under a GNU GPLv2 license.

Invoke './easyrsa' to call the program. Without commands, help is displayed.

EasyRSA Shell
# ./easyrsa init-pki


WARNING!!!

You are about to remove the EASYRSA_PKI at: C:/Program Files/OpenVPN/easy-rsa/pk
i
and initialize a fresh PKI here.

Type the word 'yes' to continue, or any other input to abort.
  Confirm removal: yes
path = C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2444.a02884/tmp.XXXXXX
lpPathBuffer = C:\Users\IEUser\AppData\Local\Temp\
szTempName = C:\Users\IEUser\AppData\Local\Temp\tmp6DEE.tmp
path = C:\Users\IEUser\AppData\Local\Temp\tmp6DEE.tmp
fd = 5

init-pki complete; you may now create a CA or requests.
Your newly created PKI dir is: C:/Program Files/OpenVPN/easy-rsa/pki



EasyRSA Shell
# ./easyrsa build-ca
Using SSL: openssl OpenSSL 1.1.1h  22 Sep 2020
path = C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.XXXXXX
lpPathBuffer = C:\Users\IEUser\AppData\Local\Temp\
szTempName = C:\Users\IEUser\AppData\Local\Temp\tmp926D.tmp
path = C:\Users\IEUser\AppData\Local\Temp\tmp926D.tmp
fd = 4
path = C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.XXXXXX
lpPathBuffer = C:\Users\IEUser\AppData\Local\Temp\
szTempName = C:\Users\IEUser\AppData\Local\Temp\tmp92EA.tmp
path = C:\Users\IEUser\AppData\Local\Temp\tmp92EA.tmp
fd = 4
path = C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.XXXXXX
lpPathBuffer = C:\Users\IEUser\AppData\Local\Temp\
szTempName = C:\Users\IEUser\AppData\Local\Temp\tmp9348.tmp
path = C:\Users\IEUser\AppData\Local\Temp\tmp9348.tmp
fd = 4

Enter New CA Key Passphrase:
Re-Enter New CA Key Passphrase:
openssl genrsa -out C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.
a03136 -aes256 -passout file:C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a0
0784/tmp.a03260 2048
Generating RSA private key, 2048 bit long modulus (2 primes)
.............................................................+++++
........................................................+++++
e is 65537 (0x010001)
path = C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.XXXXXX
lpPathBuffer = C:\Users\IEUser\AppData\Local\Temp\
szTempName = C:\Users\IEUser\AppData\Local\Temp\tmpA75D.tmp
path = C:\Users\IEUser\AppData\Local\Temp\tmpA75D.tmp
fd = 5
openssl req -config C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.
a00340 -utf8 -new -key C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/t
mp.a03136 -keyout C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.a0
3136 -out C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.a03856 -pa
ssin file:C:/Users/IEUser/AppData/Local/Temp/easy-rsa-2152.a00784/tmp.a03260 -x5
09 -days 3650
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Common Name (eg: your user, host, or server name) [Easy-RSA CA]:

CA creation complete and you may now import and sign cert requests.
Your new CA certificate file for publishing is at:
C:/Program Files/OpenVPN/easy-rsa/pki/ca.crt



EasyRSA Shell
#

[TinCanTech]

I expect 69b7891 is the reason this cannot be merged. Closing this to do a cleaner PR.