1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * lib/krb5/keytab/read_servi.c 10 * 11 * Copyright 1990 by the Massachusetts Institute of Technology. 12 * All Rights Reserved. 13 * 14 * Export of this software from the United States of America may 15 * require a specific license from the United States Government. 16 * It is the responsibility of any person or organization contemplating 17 * export to obtain such a license before exporting. 18 * 19 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 20 * distribute this software and its documentation for any purpose and 21 * without fee is hereby granted, provided that the above copyright 22 * notice appear in all copies and that both that copyright notice and 23 * this permission notice appear in supporting documentation, and that 24 * the name of M.I.T. not be used in advertising or publicity pertaining 25 * to distribution of the software without specific, written prior 26 * permission. Furthermore if you modify this software you must label 27 * your software as modified software and not distribute it in such a 28 * fashion that it might be confused with the original M.I.T. software. 29 * M.I.T. makes no representations about the suitability of 30 * this software for any purpose. It is provided "as is" without express 31 * or implied warranty. 32 * 33 * 34 * This routine is designed to be passed to krb5_rd_req. 35 * It is a convenience function that reads a key out of a keytab. 36 * It handles all of the opening and closing of the keytab 37 * internally. 38 */ 39 40 #include <k5-int.h> 41 42 #define KSUCCESS 0 43 44 /* 45 * effects: If keyprocarg is not NULL, it is taken to be the name of a 46 * keytab. Otherwise, the default keytab will be used. This 47 * routine opens the keytab and finds the principal associated with 48 * principal, vno, and enctype and returns the resulting key in *key 49 * or returning an error code if it is not found. 50 * returns: Either KSUCCESS or error code. 51 * errors: error code if not found or keyprocarg is invalid. 52 */ 53 krb5_error_code KRB5_CALLCONV 54 krb5_kt_read_service_key(krb5_context context, krb5_pointer keyprocarg, krb5_principal principal, krb5_kvno vno, krb5_enctype enctype, krb5_keyblock **key) 55 { 56 krb5_error_code kerror = KSUCCESS; 57 char keytabname[MAX_KEYTAB_NAME_LEN + 1]; /* + 1 for NULL termination */ 58 krb5_keytab id; 59 krb5_keytab_entry entry; 60 61 /* 62 * Get the name of the file that we should use. 63 */ 64 if (!keyprocarg) { 65 if ((kerror = krb5_kt_default_name(context, (char *)keytabname, 66 sizeof(keytabname) - 1))!= KSUCCESS) 67 return (kerror); 68 } else { 69 memset(keytabname, 0, sizeof(keytabname)); 70 (void) strncpy(keytabname, (char *)keyprocarg, 71 sizeof(keytabname) - 1); 72 } 73 74 if ((kerror = krb5_kt_resolve(context, (char *)keytabname, &id))) 75 return (kerror); 76 77 kerror = krb5_kt_get_entry(context, id, principal, vno, enctype, &entry); 78 (void) krb5_kt_close(context, id); 79 80 if (kerror) 81 return(kerror); 82 83 krb5_copy_keyblock(context, &entry.key, key); 84 85 krb5_kt_free_entry(context, &entry); 86 87 return (KSUCCESS); 88 } 89