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     krb5_get_credentials, krb5_get_credentials_with_flags, krb5_get_kdc_cred,
     krb5_get_renewed_creds - get credentials from the KDC using krbtgt


     Kerberos 5 Library (libkrb5, -lkrb5)


     #include <krb5.h>

     krb5_get_credentials(krb5_context context, krb5_flags options,
             krb5_ccache ccache, krb5_creds *in_creds,
             krb5_creds **out_creds);

     krb5_get_credentials_with_flags(krb5_context context, krb5_flags options,
             krb5_kdc_flags flags, krb5_ccache ccache, krb5_creds *in_creds,
             krb5_creds **out_creds);

     krb5_get_kdc_cred(krb5_context context, krb5_ccache id,
             krb5_kdc_flags flags, krb5_addresses *addresses,
             Ticket *second_ticket, krb5_creds *in_creds,
             krb5_creds **out_creds);

     krb5_get_renewed_creds(krb5_context context, krb5_creds *creds,
             krb5_const_principal client, krb5_ccache ccache,
             const char *in_tkt_service);


     krb5_get_credentials_with_flags() get credentials specified by
     in_creds->server and in_creds->client (the rest of the in_creds structure
     is ignored) by first looking in the ccache and if doesn’t exists or is
     expired, fetch the credential from the KDC using the krbtgt in ccache.
     The credential is returned in out_creds and should be freed using the
     function krb5_free_creds().

     Valid flags to pass into options argument are:

     KRB5_GC_CACHED      Only check the ccache, don’t got out on network to
                         fetch credential.
     KRB5_GC_USER_USER   Request a user to user ticket.  This option doesn’t
                         store the resulting user to user credential in the
     KRB5_GC_EXPIRED_OK  returns the credential even if it is expired, default
                         behavior is trying to refetch the credential from the

     Flags are KDCOptions, note the caller must fill in the bit-field and not
     use the integer associated structure.

     krb5_get_credentials() works the same way as
     krb5_get_credentials_with_flags() except that the flags field is missing.

     krb5_get_kdc_cred() does the same as the functions above, but the caller
     must fill in all the information andits closer to the wire protocol.

     krb5_get_renewed_creds() renews a credential given by in_tkt_service (if
     NULL the default krbtgt) using the credential cache ccache.  The result
     is stored in creds and should be freed using krb5_free_creds.


     Here is a example function that get a credential from a credential cache
     id or the KDC and returns it to the caller.

     #include <krb5.h>

     getcred(krb5_context context, krb5_ccache id, krb5_creds **creds)
         krb5_error_code ret;
         krb5_creds in;

         ret = krb5_parse_name(context, "client@EXAMPLE.COM",
         if (ret)
             krb5_err(context, 1, ret, "krb5_parse_name");

         ret = krb5_parse_name(context, "host/",
         if (ret)
             krb5_err(context, 1, ret, "krb5_parse_name");

         ret = krb5_get_credentials(context, 0, id, &in, creds);
         if (ret)
             krb5_err(context, 1, ret, "krb5_get_credentials");

         return 0;


     krb5(3), krb5_get_forwarded_creds(3), krb5.conf(5)