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This would be a more elegant mechanism for adding DNSSEC support than
my present patch. For synchrony though, perhaps this should be a
ProxyCommand style executable?
On Tue, Feb 8, 2011 at 4:03 PM, Mark Cavage <email@example.com> wrote:
> I would like to implement a feature whereby users can write their own
> plugins for authorizing use of a public key. I've got a private
> branch of this working, but would like feedback before submitting a
> patch (starting with whether the community would want this).
> Essentially, I've added a line in sshd_config like:
> PubKeyPlugin ~/local/dev/plugin/libsshplugin.so
> Which dlopen's said plugin and looks for a function that checks access
> for RSA public keys (function defined below). It would not be a
> stretch to add DSA et al., but I didn't want to bother unless this
> gets blessed. The function gets invoked in auth2-pubkey only if the
> authorized_keys file checks failed.
> I did this as the only other functionality like this I saw were things
> like the LPK/Fed-SSH patches that assume one is running LDAP; this
> mechanism allows a user to run whatever arbitrary things they want to
> determine what keys map to what users (or by group, etc.).
> Thank you!
> * NAME:
> * int sshd_user_rsa_key_allowed(RSA *rsa, struct passwd *pwd,
> const char *fingerprint)
> * DESCRIPTION:
> * Determines whether or not the specified key is allowed to
> authenticate as the user in pwd
> * INPUTS:
> * RSA * rsa The RSA public key used by the
> remote party (signature check has already passed)
> * struct passwd * pwd The user record the remote party is
> attempting to login as
> * const char * fingerprint MD5 fingerprint of the RSA public
> key (for convenience)
> * OUTPUTS:
> *  Not Allowed
> *  Allowed
> * NOTES:
> * Developers are expected to link against OpenSSL, and
> * There is no dependency on OpenSSH.
> int sshd_user_rsa_key_allowed(RSA *rsa, struct passwd *pwd, const char
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