MIT Kerberos Documentation

krb5_rd_safe - Process KRB-SAFE message.

krb5_error_code krb5_rd_safe(krb5_context context, krb5_auth_context auth_context, const krb5_data * inbuf, krb5_data * userdata_out, krb5_replay_data * rdata_out)

[in] context - Library context

[in] auth_context - Authentication context

[in] inbuf - KRB-SAFE message to be parsed

[out] userdata_out - Data parsed from KRB-SAFE message

[out] rdata_out - Replay data. Specify NULL if not needed

  • 0 Success; otherwise - Kerberos error codes

This function parses a KRB-SAFE message, verifies its integrity, and stores its data into userdata_out .

If auth_context has a remote address set, the address will be used to verify the sender address in the KRB-SAFE message. If auth_context has a local address set, it will be used to verify the receiver address in the KRB-SAFE message if the message contains one.

If the #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag is set in auth_context , the sequence number of the KRB-SAFE message is checked against the remote sequence number field of auth_context . Otherwise, the sequence number is not used.

If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in auth_context , then the timestamp in the message is verified to be within the permitted clock skew of the current time, and the message is checked against an in-memory replay cache to detect reflections or replays.

Use krb5_free_data_contents() to free userdata_out when it is no longer needed.


The rdata_out argument is required if the #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in auth_context .