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FreeBSD 11.0 - man page for krb5_verify_init_creds (freebsd section 3)

KRB5_VERIFY_INIT_CREDS(3)				   BSD Library Functions Manual 				 KRB5_VERIFY_INIT_CREDS(3)

krb5_verify_init_creds_opt_init, krb5_verify_init_creds_opt_set_ap_req_nofail, krb5_verify_init_creds -- verifies a credential cache is cor- rect by using a local keytab
Kerberos 5 Library (libkrb5, -lkrb5)
#include <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);
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.
krb5(3), krb5_get_init_creds(3), krb5_verify_user(3), krb5.conf(5)
May 1, 2006 HEIMDAL

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