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GPG over SSH with existing X session?
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Tatsh
Apprentice
Apprentice


Joined: 22 Jul 2007
Posts: 178

PostPosted: Tue Sep 13, 2016 8:37 am    Post subject: GPG over SSH with existing X session? Reply with quote

I have had no luck attempting to use gpg while over SSH while having an existing session already running.

I have a headless server that has no X whatsoever and it always happily shows the GPG ncurses screen for a password. I want to get the same thing to happen on my primary desktop.

Something starts GPG as me (not root), because Thunderbird is able to see it and sign emails. Pinentry-gtk works fine.

Not using X over SSH, and I ssh in:

Code:
$ gpg -s
gpg: WARNING: server 'gpg-agent' is older than us (2.1.14 < 2.1.15)
gpg: using "1AFD9AFC120C26DD" as default secret key for signing
some text
gpg: signing failed: Inappropriate ioctl for device
�������(�w�!�����¯�2+��MU(I�(�gpg: signing failed: Inappropriate ioctl for device


Debug:

Code:
$ gpg --debug-all
gpg: reading options from '/home/tatsh/.gnupg/gpg.conf'
gpg: enabled debug flags: packet mpi crypto filter iobuf memory cache memstat trust hashing cardio ipc clock lookup extprog
gpg: DBG: [not enabled in the source] start
gpg: Go ahead and type your message ...
gpg: DBG: iobuf-1.0: open '[stdin]' desc=file_filter(fd) fd=0
gpg: DBG: iobuf-1.0: underflow: buffer size: 8192; still buffered: 0 => space for 8192 bytes
gpg: DBG: iobuf-1.0: underflow: A->FILTER (8192 bytes)
jfjf
gpg: DBG: iobuf-1.0: A->FILTER() returned rc=0 (ok), read 5 bytes
gpg: DBG: armor-filter: control: 5
gpg: DBG: iobuf-1.1: push 'armor_filter'
gpg: DBG: armor-filter: control: 5
gpg: DBG: iobuf chain: 1.1 'armor_filter' filter_eof=0 start=0 len=0
gpg: DBG: iobuf chain: 1.0 'file_filter(fd)' filter_eof=0 start=0 len=5
gpg: DBG: armor-filter: control: 1
gpg: DBG: iobuf-1.1: underflow: buffer size: 8192; still buffered: 0 => space for 8192 bytes
gpg: DBG: iobuf-1.1: underflow: A->FILTER (8192 bytes)
gpg: DBG: armor-filter: control: 3
gpg: DBG: iobuf-1.0: underflow: buffer size: 8192; still buffered: 0 => space for 8192 bytes
gpg: DBG: iobuf-1.0: underflow: A->FILTER (8192 bytes)
gpg: DBG: iobuf-1.0: A->FILTER() returned rc=-1 (EOF), read 0 bytes
gpg: DBG: iobuf-1.0: underflow: buffer size: 8192; still buffered: 0 => space for 8192 bytes
gpg: DBG: iobuf-1.0: underflow: eof (pending eof)
gpg: DBG: iobuf-1.1: A->FILTER() returned rc=-1 (EOF), read 0 bytes
gpg: DBG: armor-filter: control: 2
gpg: no valid OpenPGP data found.
gpg: DBG: iobuf-1.1: pop in underflow (nothing buffered, got EOF)
gpg: DBG: iobuf chain: 1.0 '?' filter_eof=0 start=0 len=0
gpg: processing message failed: Unknown system error
gpg: DBG: iobuf-1.0: close '?'
gpg: DBG: [not enabled in the source] stop
gpg: random usage: poolsize=600 mixed=0 polls=0/0 added=0/0
              outmix=0 getlvl1=0/0 getlvl2=0/0
gpg: secmem usage: 0/65536 bytes in 0 blocks


Code:
$ env | egrep 'GPG|DISPLAY'
GPG_TTY=/dev/pts/2
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Princess Nell
l33t
l33t


Joined: 15 Apr 2005
Posts: 739

PostPosted: Sun Sep 25, 2016 10:52 pm    Post subject: Reply with quote

It isn't quite clear from your description what exactly your setup is and which commands are being run on one machine. It also looks like you're running 2.1, which I'm not familiar with yet.
Code:
$ gpg -s
gpg: WARNING: server 'gpg-agent' is older than us (2.1.14 < 2.1.15)
gpg: using "1AFD9AFC120C26DD" as default secret key for signing
some text
gpg: signing failed: Inappropriate ioctl for device
�������(�w�!�����¯�2+��MU(I�(�gpg: signing failed: Inappropriate ioctl for device

GPG_TTY, or so is my understanding, needs to be correct for the current terminal session. If it gets inherited from a remote machine, it's probably wrong. In the above session, does the output of tty match the contents of GPG_TTY?

Quote:
Something starts GPG as me (not root), because Thunderbird is able to see it and sign emails. Pinentry-gtk works fine.

In an X session, gpg-agent is launched by whatever is starting the session. Without that, a temporary gpg-agent is launched by gpg itself.
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