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agent: Add "ephemeral" Assuan option.

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* agent/agent.h (struct ephemeral_private_key_s): New.
(struct server_control_s): Add ephemeral_mode and ephemeral_keys.
(GENKEY_FLAG_NO_PROTECTION, GENKEY_FLAG_PRESET): New.
* agent/genkey.c (clear_ephemeral_keys): New.
(store_key): Add arg ctrl and implement ephemeral_mode.  Change all
callers.
(agent_genkey): Replace args no_protection and preset by a generic new
flags arg.
* agent/findkey.c (wipe_and_fclose): New.
(agent_write_private_key): Add arg ctrl and implement ephemeral_mode.
Change all callers.
(agent_update_private_key): Ditto
(read_key_file): Ditto.
(agent_key_available): Ditto.
* agent/command-ssh.c (card_key_available): Do not update display s/n
in ephemeral mode.  This is however enver triggred.
* agent/gpg-agent.c (agent_deinit_default_ctrl): Cleanup ephemeral
keys.
* agent/command.c (cmd_genkey): Use the new flags instead of separate
vars.
(cmd_readkey): Create a shadow key only in non-ephemeral_mode.
(cmd_getinfo): Add sub-command "ephemeral".
(option_handler): Add option "ephemeral".
--

The idea here that a session can be switched in an ephemeral mode
which does not store or read keys from disk but keeps them local to
the session.

GnuPG-bug-id: 6944
This commit is contained in:
Werner Koch 2024-01-22 13:22:44 +01:00
parent 18320d692c
commit 434a641d40
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
11 changed files with 496 additions and 206 deletions
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8
agent/command-ssh.c
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@ -2430,14 +2430,14 @@ card_key_available (ctrl_t ctrl, const struct card_key_info_s *keyinfo,
}
hex2bin (keyinfo->keygrip, grip, sizeof (grip));
if ( agent_key_available (grip) )
if (!ctrl->ephemeral_mode && agent_key_available (ctrl, grip) )
{
char *dispserialno;
/* (Shadow)-key is not available in our key storage. */
agent_card_getattr (ctrl, "$DISPSERIALNO", &dispserialno,
keyinfo->keygrip);
err = agent_write_shadow_key (grip, keyinfo->serialno,
err = agent_write_shadow_key (ctrl, grip, keyinfo->serialno,
keyinfo->idstr, pkbuf, 0, dispserialno);
xfree (dispserialno);
if (err)
@ -3222,7 +3222,7 @@ ssh_identity_register (ctrl_t ctrl, ssh_key_type_spec_t *spec,
/* Check whether the key is already in our key storage. Don't do
anything then besides (re-)adding it to sshcontrol. */
if ( !agent_key_available (key_grip_raw) )
if ( !agent_key_available (ctrl, key_grip_raw) )
goto key_exists; /* Yes, key is available. */
err = ssh_key_extract_comment (key, &comment);
@ -3286,7 +3286,7 @@ ssh_identity_register (ctrl_t ctrl, ssh_key_type_spec_t *spec,
/* Store this key to our key storage. We do not store a creation
* timestamp because we simply do not know. */
err = agent_write_private_key (key_grip_raw, buffer, buffer_n, 0,
err = agent_write_private_key (ctrl, key_grip_raw, buffer, buffer_n, 0,
NULL, NULL, NULL, 0);
if (err)
goto out;