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2023-09-19pam: T5577: Improved PAM configs for RADIUS and TACACS+zsdc
After sources analysis, we found the next possible return statuses for PAM modules: 1. pam_tacplus Auth: - PAM_AUTH_ERR - PAM_AUTHINFO_UNAVAIL - PAM_AUTHTOK_ERR - PAM_BUF_ERR - PAM_CRED_INSUFFICIENT - PAM_PERM_DENIED - PAM_SUCCESS - PAM_USER_UNKNOWN Account: - PAM_AUTH_ERR - PAM_AUTHINFO_UNAVAIL - PAM_PERM_DENIED - PAM_SUCCESS - PAM_USER_UNKNOWN Session: - PAM_AUTHINFO_UNAVAIL - PAM_SESSION_ERR - PAM_SUCCESS - PAM_USER_UNKNOWN 2. pam_radius_auth Auth: - PAM_ABORT - PAM_AUTH_ERR - PAM_AUTHINFO_UNAVAIL - PAM_AUTHTOK_ERR - PAM_BAD_ITEM - PAM_BUF_ERR - PAM_CONV_AGAIN - PAM_CONV_ERR - PAM_IGNORE - PAM_NO_MODULE_DATA - PAM_PERM_DENIED - PAM_SUCCESS - PAM_SYSTEM_ERR - PAM_USER_UNKNOWN Account: - PAM_SUCCESS Session: - PAM_ABORT - PAM_AUTHINFO_UNAVAIL - PAM_BAD_ITEM - PAM_BUF_ERR - PAM_CONV_AGAIN - PAM_CONV_ERR - PAM_IGNORE - PAM_NO_MODULE_DATA - PAM_PERM_DENIED - PAM_SUCCESS - PAM_SYSTEM_ERR - PAM_USER_UNKNOWN PAM configurations were replaced with tuned versions to take this into account.
2023-09-13RADIUS: T5577: Added `mandatory` and `optional` modes for RADIUSzsdc
In CLI we can choose authentication logic: - `mandatory` - if RADIUS answered with `Access-Reject`, authentication must be stopped and access denied immediately. - `optional` (default) - if RADIUS answers with `Access-Reject`, authentication continues using the next module. In `mandatory` mode authentication will be stopped only if RADIUS clearly answered that access should be denied (no user in RADIUS database, wrong password, etc.). If RADIUS is not available or other errors happen, it will be skipped and authentication will continue with the next module, like in `optional` mode.