oath_authenticate_usersfile - API function

const char * usersfile string with user credential filename, in UsersFile format const char * username string with name of user const char * otp string with one-time password to authenticate size_t window how many past/future OTPs to search const char * passwd string with password, or NULL to disable password checking time_t * last_otp output variable holding last successful authentication

Copyright © 2009-2020 Simon Josefsson. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. liboath 2.6.12 oath_authenticate_usersfile(3)

Authenticate user named username with the one-time password otp and (optional) password passwd. Credentials are read (and updated) from a text file named usersfile. Note that for TOTP the usersfile will only record the last OTP and use that to make sure more recent OTPs have not been seen yet when validating a new OTP. That logics relies on using the same search window for the same user.

oath_authenticate_usersfile - API function

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On successful validation, OATH_OK is returned. If the supplied otp is the same as the last successfully authenticated one-time password, OATH_REPLAYED_OTP is returned and the timestamp of the last authentication is returned in last_otp. If the one-time password is not found in the indicated search window, OATH_INVALID_OTP is returned. Otherwise, an error code is returned.