KRB5_VERIFY_INIT_CREDS(3) | Library Functions Manual | KRB5_VERIFY_INIT_CREDS(3)

# NAME

`krb5_verify_init_creds_opt_init`, `krb5_verify_init_creds_opt_set_ap_req_nofail`, `krb5_verify_init_creds` —
verifies a credential cache is correct by using a local keytab

# LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

# SYNOPSIS

`#include <krb5/krb5.h>`

`struct krb5_verify_init_creds_opt;`
void
`krb5_verify_init_creds_opt_init`(krb5_verify_init_creds_opt *options);

void
`krb5_verify_init_creds_opt_set_ap_req_nofail`(krb5_verify_init_creds_opt *options, int ap_req_nofail);

krb5_error_code
`krb5_verify_init_creds`(krb5_context context, krb5_creds *creds, krb5_principal ap_req_server, krb5_ccache *ccache, krb5_verify_init_creds_opt *options);

# DESCRIPTION

The `krb5_verify_init_creds` function verifies the initial tickets with the local keytab to make sure the response of the KDC was spoof-ed.

`krb5_verify_init_creds` will use principal ap_req_server from the local keytab, if `NULL` is passed in, the code will guess the local hostname and use that to form host/hostname/GUESSED-REALM-FOR-HOSTNAME. creds is the credential that `krb5_verify_init_creds` should verify. If ccache is given `krb5_verify_init_creds`() stores all credentials it fetched from the KDC there, otherwise it will use a memory credential cache that is destroyed when done.

`krb5_verify_init_creds_opt_init`() cleans the the structure, must be used before trying to pass it in to `krb5_verify_init_creds`().

`krb5_verify_init_creds_opt_set_ap_req_nofail`() controls controls the behavior if ap_req_server doesn't exists in the local keytab or in the KDC's database, if it's true, the error will be ignored. Note that this use is possible insecure.

# SEE ALSO

krb5(3), krb5_get_init_creds(3), krb5_verify_user(3), krb5.conf(5)

May 1, 2006 | NetBSD 9.2