NAME
       sasl_server_userdb_checkpass_t   -   Plaintext   Password  Verification
       Callback
SYNOPSIS
       #include <sasl/sasl.h>
       int sasl_server_userdb_checkpass_t(sasl_conn_t *conn,
                                          void *context,
                                      const char *user,
                                          const char *pass,
                                          unsigned passlen,
                                          struct propctx *propctx)
DESCRIPTION
       sasl_server_userdb_checkpass_t is used to verify a  plaintext  password
       against  the  callback  supplier’s  user  database.   This  is to allow
       additional ways to encode the userPassword property.
       context context from the callback record
       user NUL terminated user name with user@realm syntax
       pass password to check (may not be NUL terminated)
       passlen length of the password
       propctx property context to fill in with userPassword
RETURN VALUE
       SASL callback functions should return SASL return codes. See sasl.h for
       a complete list. SASL_OK indicates success.
SEE ALSO
       sasl(3),               sasl_callbacks(3),               sasl_errors(3),
       sasl_server_userdb_setpass_t(3)