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agent-transfer(1)

monkeysphere
Jan 2019

monkeysphere

leverage the OpenPGP web of trust for SSH and TLS authentication

agent-transfer

copy a secret key from GnuPG's gpg-agent to OpenSSH's ssh-agent

NAME

agent-transfer - copy a secret key from gpg-agent to ssh-agent

SYNOPSIS

agent-transfer [options] KEYGRIP [COMMENT]

DESCRIPTION

agent-transfer extracts a secret key from a modern version of GnuPG agent and sends it to the running SSH agent. This is useful for people whose keys are managed in the long-term by GnuPG’s gpg-agent, but who prefer the semantics of OpenSSH’s ssh-agent for regular use.
agent-transfer was written as part of the monkeysphere project.
The KEYGRIP should be specified as a sequence of 20 hexadecimal characters. If you aren’t sure of the keygrip, you can inspect the output of:
gpg --with-keygrip --list-secret-keys
The COMMENT is optional, and will be stored alongside the key in ssh-agent. It must not start with a -, to avoid being mistaken for an option.

OPTIONS

agent-transfer also accepts options that would normally be passed to ssh-add(1) to constrain the use of the transferred key:
-c Indicates that added identities should be subject to confirmation before being used for authentication.
-t SECONDS
Indicates that the key should have a lifetime of SECONDS in the running ssh-agent.

FILES

~/.gnupg/S.gpg-agent
The socket where gpg-agent is listening. This is the "standard socket" for modern GnuPG.

ENVIRONMENT VARIABLES

GNUPGHOME
The GnuPG home directory, where the standard socket for gpg-agent lives. If this is not set, it is assumed to be ~/.gnupg.
SSH_AUTH_SOCK
Specifies the location where the running ssh-agent is present.
Several other environment variables are also passed in some form to the gpg-agent to help it figure out how to run a sensible pinentry, including GPG_TTY, TERM, DISPLAY, XAUTHORITY, GTK_IM_MODULE, DBUS_SESSION_BUS_ADDRESS, and LANG.

BUGS

agent-transfer can only work with RSA and Ed25519 keys. Support for other key types not yet implemented. Patches welcome!

AUTHOR

Written by: Daniel Kahn Gillmor <>
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