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There are various parts of the SSH-2 protocol where things are specified using a textual name. Names ending in
@putty.projects.tartarus.org are reserved for allocation by the PuTTY team. Allocated names are documented here.
These names can be sent in a
SSH_MSG_CHANNEL_WINDOW_ADJUST messages as part of its window-size tuning. It can be sent on any type of channel. There is no message-specific data. Servers MUST treat it as an unrecognised request and respond with
(Some SSH servers get confused by this message, so there is a bug-compatibility mode for disabling it. See section 4.26.3.)
The SSH agent protocol, which is only specified in an Internet-Draft at the time of writing (
draft-miller-ssh-agent), defines an extension mechanism. These names can be sent in an
string containing a keypair in the PPK format defined in appendix C. Compared to the standard
SSH_AGENTC_ADD_IDENTITY, this extension allows adding keys in encrypted form, with the agent requesting a decryption passphrase from the user on demand, and able to revert the key to encrypted form.
string specifying a public key blob, as in
SSH_AGENTC_REMOVE_IDENTITY. Requests that the agent forget any cleartext form of a specific key.
SSH_AGENT_SUCCESS if the agent ended up holding the key only in encrypted form (even if it was already encrypted); returns
SSH_AGENT_EXTENSION_FAILURE if not (if it wasn't held by the agent at all, or only in cleartext form).
If the agent holds any keys with an encrypted form (or no keys at all), returns
SSH_AGENT_SUCCESS to indicate that no such keys are now held in cleartext form, followed by a
uint32 specifying how many keys remain in cleartext form (because the agent didn't hold an encrypted form for them). If the agent holds nothing but keys in cleartext form, returns
SSH_AGENT_SUCCESS followed by a list of identities similar to
SSH_AGENT_IDENTITIES_ANSWER, except that each key has an extra SSH-2
string at the end. Currently that
string contains a single
uint32 flags word, with the following bits defined:
reencrypt extension can do something useful with it).
ersionid PuTTY release 0.77
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