MIT Kerberos Documentation

krb5_get_init_creds_opt_set_expire_callback - Set an expiration callback in initial credential options.

krb5_error_code krb5_get_init_creds_opt_set_expire_callback(krb5_context context, krb5_get_init_creds_opt * opt, krb5_expire_callback_func cb, void * data)

[in] context - Library context

[in] opt - Options structure

[in] cb - Callback function

[in] data - Callback argument

Set a callback to receive password and account expiration times.

This option only applies to krb5_get_init_creds_password() . cb will be invoked if and only if credentials are successfully acquired. The callback will receive the context from the krb5_get_init_creds_password() call and the data argument supplied with this API. The remaining arguments should be interpreted as follows:

If is_last_req is true, then the KDC reply contained last-req entries which unambiguously indicated the password expiration, account expiration, or both. (If either value was not present, the corresponding argument will be 0.) Furthermore, a non-zero password_expiration should be taken as a suggestion from the KDC that a warning be displayed.

If is_last_req is false, then account_expiration will be 0 and password_expiration will contain the expiration time of either the password or account, or 0 if no expiration time was indicated in the KDC reply. The callback should independently decide whether to display a password expiration warning.

Note that cb may be invoked even if credentials are being acquired for the kadmin/changepw service in order to change the password. It is the caller’s responsibility to avoid displaying a password expiry warning in this case.


Setting an expire callback with this API will cause krb5_get_init_creds_password() not to send password expiry warnings to the prompter, as it ordinarily may.


New in 1.9