2016-07-31 16:39 GMT+02:00 <aki.tu...@dovecot.fi>: > > > On July 27, 2016 at 2:08 AM Andreas Meyer <luckyfello...@gmail.com> > wrote: > > > > > > Hi, > > > > > > I want to add a new password hashing scheme as plugin and provide it for > > the dovecot project, so that it will be included as optional plugin in > > future releases. > > > > Yet the plugin compiles fine and the .so file gets created. > > > > My approach is to call the functions password_scheme_register() and > > password_scheme_unregister() (src/auth/password-scheme.c) inside the > > plugin's _init() and _deinit() functions. > > > > When a client tries to login via imap the log shows an error message: > > > > Error: Couldn't load required plugin > > /usr/local/lib/dovecot/lib20_newauth_plugin.so: dlopen() failed: > > /usr/local/lib/dovecot/lib20_newauth_plugin.so: undefined symbol: > > password_scheme_unregister > > > > That error obviously occurs, because the required lib is not linked into > > the plugin. > > > > > > Now my problem is to understand, whether this approach (via .so file) can > > be successful at all and if so, how? > > Do I need to link libs into it? Which would that be and how do I specify > > them in the Makefile.am? > > > > I assume, I don't need to link a lib, but need to use a hook to register > > the new hashing scheme, since the plugin is loaded into an already > existing > > process, which needs to get extended. If this is true, which hook would > > that be and how do I register the new scheme? > > > > Or is there no way to accomplish this via a separated .so plugin? Should > I > > extend the sources in /src/auth instead? (separat file for the hashing > > scheme with preprocessor instructions to include it only on demand) > > > > > > > > Thank you very much, > > > > Andreas > > Can you publish your code in, say, github.com and provide link to it? > New password scheme is doable as plugin but it needs to placed in different > place and it will be autoloaded. > > Aki >
I created two branches. Both compile fine with the option: --with-libsodium Branch #1) https://github.com/LuckyFellow/dovecot-core-libsodium/tree/2.2.25_libsodium_plugin This is my try to add libsodium support as plugin. When the plugin is loaded, it exits with the mentioned error message "undefined symbol: password_scheme_unregister" Branch #2) https://github.com/LuckyFellow/dovecot-core-libsodium/tree/2.2.25_libsodium_auth This compiles fine and also works. The new hashing schemes SCRYPT and ARGON2 are available to dovecot. Libsodium support is not created as module, but only added if the --with-libsodium option was passed to configure. Regards, Andreas
