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 * outbuf, krb5_replay_data * outdata)

[in] context - Library context

[in] auth_context - Authentication context

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

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

[out] outdata - 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 outbuf .

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 two additional checks are performed:

  • The timestamp in the message must be within the permitted clock skew (which is usually five minutes).
  • The message must not be a replayed message field in auth_context .

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


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

auth_context must have a remote address set. This 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. Both addresses must use type ADDRTYPE_ADDRPORT .