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PostPosted: Sun Mar 19, 2017 6:03 am 
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Joined: Sun Mar 19, 2017 5:55 am
Posts: 3
So I have a gpg key generated per the tutorial here: https://developers.yubico.com/yubikey-ksm/Generate_KSM_Key.html

However gpg does not request my passphrase when I try to generate KSM keys via:

Code:
ykksm-gen-keys --urandom 1 5 | gpg -a --encrypt -r XXXXXXXX -s > keys.txt


The output ends as follows:

Code:
gpg: cancelled by user
gpg: no default secret key: Operation cancelled
gpg: [stdin]: sign+encrypt failed: Operation cancelled


I found a possible workaround by using the following:

Code:
gpg -r XXXXXXXX--output keys.txt.gpg --encrypt keys.txt


But then the importer gives me a similar error, expecting a passphrase to unlock the secret key and it never prompting for one:
Code:
[GNUPG:] ENC_TO XXXXXXXXXXXXXXXX 1 0
[GNUPG:] USERID_HINT XXXXXXXXXXXXXXXX YK-KSM Import Key
[GNUPG:] NEED_PASSPHRASE XXXXXXXXXXXXXXXX YYYYYYYYYYYYYYYYYYY 1 0
gpg: cancelled by user
[GNUPG:] MISSING_PASSPHRASE
gpg: encrypted with 2048-bit RSA key, ID ZZZZZZZZZ, created 2017-03-19
      "YK-KSM Import Key"
gpg: public key decryption failed: Operation cancelled
[GNUPG:] ERROR pkdecrypt_failed 99
[GNUPG:] BEGIN_DECRYPTION
[GNUPG:] DECRYPTION_FAILED
gpg: decryption failed: No secret key
[GNUPG:] END_DECRYPTION
encrypted to: XXXXXXXXXXXXXXXX
signed by:
Input not signed? at /usr/bin/ykksm-import line 122.


I realize this may be a specific issue with gpg2 configuration in CentOS 7, but thought someone else may have run into this issue too. Any help is greatly appreciated.


Last edited by drcheese on Sun Mar 19, 2017 6:44 am, edited 2 times in total.

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PostPosted: Sun Mar 19, 2017 6:16 am 
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Joined: Sun Mar 19, 2017 5:55 am
Posts: 3
Okay, so that was quick. I have half of my solution.

Basically the gpg2 does not allow forcing entry of the passphrase all the time so you have to cache it somehow. I did this by creating a dummy file called test.txt and creating a signature for it via the command:

Code:
gpg --clearsign test.txt


That caused the passphrase prompt:

Code:
   lqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk
   x Please enter the passphrase to unlock the secret key for the OpenPGP  x
   x certificate:                                                          x
   x "YK-KSM Import Key"                                                   x
   x 2048-bit RSA key, ID XXXXXXXX,                                        x
   x created 2017-03-19.                                                   x
   x                                                                       x
   x                                                                       x
   x Passphrase __________________________________________________________ x
   x                                                                       x
   x          <OK>                                         <Cancel>        x
   mqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj


However this did not fix the importer issue where it did not prompt for the passphrase a second time. Any help on this? I can't seem to get around this issue.


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PostPosted: Sun Mar 19, 2017 6:43 am 
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Joined: Sun Mar 19, 2017 5:55 am
Posts: 3
Solved...

Create ~/.gnupg/gpg-agent.conf and add this one line:

Code:
max-cache-ttl 0


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