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…memory, allow client to use GPG, Rijndael or TOTP
…oring and check TODOs
…ess overwriting keys
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#354
An attempt to integrate the Time-based One-Time Passwords (TOTP) with fwknop. The implementation was done according to RFC 6238, tested with common authenticator applications such as Google Authenticator. Parameters (time-step value and TOTP digits) are not currently configurable, but could be done.
To validate the TOTP, an optional field was added inside the SPA packet, that is sent to the server from the client. If the client's access.conf file contains the TOTP_BASE32 parameter on the server, then the code is calculated and compared to the one obtained from the SPA packet data (after the HMAC verification and blob decryption).
Base32 utility functions were added into the libfko library based on RFC 4648.
All the work was done as part of a Bachelor's thesis on Single Packet Authorization at the University of Tartu.