krb5_get_renewed_creds (3) - Linux Manuals

NAME

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

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

In krb5.h Ft krb5_error_code Fo krb5_get_credentials Fa krb5_context context Fa krb5_flags options Fa krb5_ccache ccache Fa krb5_creds *in_creds Fa krb5_creds **out_creds Fc Ft krb5_error_code Fo krb5_get_credentials_with_flags Fa krb5_context context Fa krb5_flags options Fa krb5_kdc_flags flags Fa krb5_ccache ccache Fa krb5_creds *in_creds Fa krb5_creds **out_creds Fc Ft krb5_error_code Fo krb5_get_kdc_cred Fa krb5_context context Fa krb5_ccache id Fa krb5_kdc_flags flags Fa krb5_addresses *addresses Fa Ticket *second_ticket Fa krb5_creds *in_creds Fa krb5_creds **out_creds Fc Ft krb5_error_code Fo krb5_get_renewed_creds Fa krb5_context context Fa krb5_creds *creds Fa krb5_const_principal client Fa krb5_ccache ccache Fa const char *in_tkt_service Fc

DESCRIPTION

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

Valid flags to pass into Fa options argument are:

KRB5_GC_CACHED

Only check the Fa 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 Fa ccache .

KRB5_GC_EXPIRED_OK

returns the credential even if it is expired, default behavior is trying to refetch the credential from the KDC.

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

Fn krb5_get_credentials works the same way as Fn krb5_get_credentials_with_flags except that the Fa flags field is missing.

Fn 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.

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

EXAMPLES

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

#include <krb5.h>

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

    ret = krb5_parse_name(context, "client [at] EXAMPLE.COM",
                          &in.client);
    if (ret)
        krb5_err(context, 1, ret, "krb5_parse_name");

    ret = krb5_parse_name(context, "host/server.example.com [at] EXAMPLE.COM",
                          &in.server);
    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;
}