17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * lib/krb5/krb/encode_kdc.c 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * Copyright 1990 by the Massachusetts Institute of Technology. 57c478bd9Sstevel@tonic-gate * All Rights Reserved. 67c478bd9Sstevel@tonic-gate * 77c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may 87c478bd9Sstevel@tonic-gate * require a specific license from the United States Government. 97c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating 107c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting. 117c478bd9Sstevel@tonic-gate * 127c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 137c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and 147c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright 157c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and 167c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that 177c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining 187c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior 197c478bd9Sstevel@tonic-gate * permission. Furthermore if you modify this software you must label 207c478bd9Sstevel@tonic-gate * your software as modified software and not distribute it in such a 217c478bd9Sstevel@tonic-gate * fashion that it might be confused with the original M.I.T. software. 227c478bd9Sstevel@tonic-gate * M.I.T. makes no representations about the suitability of 237c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express 247c478bd9Sstevel@tonic-gate * or implied warranty. 257c478bd9Sstevel@tonic-gate * 267c478bd9Sstevel@tonic-gate * 277c478bd9Sstevel@tonic-gate * krb5_encode_kdc_rep() function. 287c478bd9Sstevel@tonic-gate */ 297c478bd9Sstevel@tonic-gate 30*159d09a2SMark Phalan #include "k5-int.h" 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate /* 337c478bd9Sstevel@tonic-gate Takes KDC rep parts in *rep and *encpart, and formats it into *enc_rep, 347c478bd9Sstevel@tonic-gate using message type type and encryption key client_key and encryption type 357c478bd9Sstevel@tonic-gate etype. 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate The string *enc_rep will be allocated before formatting; the caller should 387c478bd9Sstevel@tonic-gate free when finished. 397c478bd9Sstevel@tonic-gate 407c478bd9Sstevel@tonic-gate returns system errors 417c478bd9Sstevel@tonic-gate 427c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext is allocated and filled in. 437c478bd9Sstevel@tonic-gate */ 447c478bd9Sstevel@tonic-gate /* due to argument promotion rules, we need to use the DECLARG/OLDDECLARG 457c478bd9Sstevel@tonic-gate stuff... */ 467c478bd9Sstevel@tonic-gate krb5_error_code 47505d05c7Sgtb krb5_encode_kdc_rep(krb5_context context, krb5_msgtype type, 48505d05c7Sgtb const krb5_enc_kdc_rep_part *encpart, 49505d05c7Sgtb int using_subkey, const krb5_keyblock *client_key, 50505d05c7Sgtb krb5_kdc_rep *dec_rep, krb5_data **enc_rep) 517c478bd9Sstevel@tonic-gate { 527c478bd9Sstevel@tonic-gate krb5_data *scratch; 537c478bd9Sstevel@tonic-gate krb5_error_code retval; 547c478bd9Sstevel@tonic-gate krb5_enc_kdc_rep_part tmp_encpart; 557c478bd9Sstevel@tonic-gate krb5_keyusage usage; 567c478bd9Sstevel@tonic-gate 57*159d09a2SMark Phalan if (!krb5_c_valid_enctype(dec_rep->enc_part.enctype)) 587c478bd9Sstevel@tonic-gate return KRB5_PROG_ETYPE_NOSUPP; 597c478bd9Sstevel@tonic-gate 607c478bd9Sstevel@tonic-gate switch (type) { 617c478bd9Sstevel@tonic-gate case KRB5_AS_REP: 627c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_AS_REP_ENCPART; 637c478bd9Sstevel@tonic-gate break; 647c478bd9Sstevel@tonic-gate case KRB5_TGS_REP: 657c478bd9Sstevel@tonic-gate if (using_subkey) 667c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY; 677c478bd9Sstevel@tonic-gate else 687c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY; 697c478bd9Sstevel@tonic-gate break; 707c478bd9Sstevel@tonic-gate default: 717c478bd9Sstevel@tonic-gate return KRB5_BADMSGTYPE; 727c478bd9Sstevel@tonic-gate } 737c478bd9Sstevel@tonic-gate 747c478bd9Sstevel@tonic-gate /* 757c478bd9Sstevel@tonic-gate * We don't want to modify encpart, but we need to be able to pass 767c478bd9Sstevel@tonic-gate * in the message type to the encoder, so it can set the ASN.1 777c478bd9Sstevel@tonic-gate * type correct. 787c478bd9Sstevel@tonic-gate * 797c478bd9Sstevel@tonic-gate * Although note that it may be doing nothing with the message 807c478bd9Sstevel@tonic-gate * type, to be compatible with old versions of Kerberos that always 817c478bd9Sstevel@tonic-gate * encode this as a TGS_REP regardly of what it really should be; 827c478bd9Sstevel@tonic-gate * also note that the reason why we are passing it in a structure 837c478bd9Sstevel@tonic-gate * instead of as an argument to encode_krb5_enc_kdc_rep_part (the 847c478bd9Sstevel@tonic-gate * way we should) is for compatibility with the ISODE version of 857c478bd9Sstevel@tonic-gate * this fuction. Ah, compatibility.... 867c478bd9Sstevel@tonic-gate */ 877c478bd9Sstevel@tonic-gate tmp_encpart = *encpart; 887c478bd9Sstevel@tonic-gate tmp_encpart.msg_type = type; 897c478bd9Sstevel@tonic-gate retval = encode_krb5_enc_kdc_rep_part(&tmp_encpart, &scratch); 907c478bd9Sstevel@tonic-gate if (retval) { 917c478bd9Sstevel@tonic-gate return retval; 927c478bd9Sstevel@tonic-gate } 937c478bd9Sstevel@tonic-gate memset(&tmp_encpart, 0, sizeof(tmp_encpart)); 947c478bd9Sstevel@tonic-gate 957c478bd9Sstevel@tonic-gate #define cleanup_scratch() { (void) memset(scratch->data, 0, scratch->length); \ 967c478bd9Sstevel@tonic-gate krb5_free_data(context, scratch); } 977c478bd9Sstevel@tonic-gate 987c478bd9Sstevel@tonic-gate retval = krb5_encrypt_helper(context, client_key, usage, scratch, 997c478bd9Sstevel@tonic-gate &dec_rep->enc_part); 1007c478bd9Sstevel@tonic-gate 1017c478bd9Sstevel@tonic-gate #define cleanup_encpart() { \ 1027c478bd9Sstevel@tonic-gate (void) memset(dec_rep->enc_part.ciphertext.data, 0, \ 1037c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.length); \ 1047c478bd9Sstevel@tonic-gate free(dec_rep->enc_part.ciphertext.data); \ 1057c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.length = 0; \ 1067c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.data = 0;} 1077c478bd9Sstevel@tonic-gate 1087c478bd9Sstevel@tonic-gate cleanup_scratch(); 1097c478bd9Sstevel@tonic-gate 1107c478bd9Sstevel@tonic-gate if (retval) 1117c478bd9Sstevel@tonic-gate return(retval); 1127c478bd9Sstevel@tonic-gate 1137c478bd9Sstevel@tonic-gate /* now it's ready to be encoded for the wire! */ 1147c478bd9Sstevel@tonic-gate 1157c478bd9Sstevel@tonic-gate switch (type) { 1167c478bd9Sstevel@tonic-gate case KRB5_AS_REP: 1177c478bd9Sstevel@tonic-gate retval = encode_krb5_as_rep(dec_rep, enc_rep); 1187c478bd9Sstevel@tonic-gate break; 1197c478bd9Sstevel@tonic-gate case KRB5_TGS_REP: 1207c478bd9Sstevel@tonic-gate retval = encode_krb5_tgs_rep(dec_rep, enc_rep); 1217c478bd9Sstevel@tonic-gate break; 1227c478bd9Sstevel@tonic-gate } 1237c478bd9Sstevel@tonic-gate 1247c478bd9Sstevel@tonic-gate if (retval) 1257c478bd9Sstevel@tonic-gate cleanup_encpart(); 1267c478bd9Sstevel@tonic-gate 1277c478bd9Sstevel@tonic-gate return retval; 1287c478bd9Sstevel@tonic-gate } 129