17c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 27c478bd9Sstevel@tonic-gate /* 37c478bd9Sstevel@tonic-gate * lib/krb5/krb/encode_kdc.c 47c478bd9Sstevel@tonic-gate * 57c478bd9Sstevel@tonic-gate * Copyright 1990 by the Massachusetts Institute of Technology. 67c478bd9Sstevel@tonic-gate * All Rights Reserved. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may 97c478bd9Sstevel@tonic-gate * require a specific license from the United States Government. 107c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating 117c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 147c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and 157c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright 167c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and 177c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that 187c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining 197c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior 207c478bd9Sstevel@tonic-gate * permission. Furthermore if you modify this software you must label 217c478bd9Sstevel@tonic-gate * your software as modified software and not distribute it in such a 227c478bd9Sstevel@tonic-gate * fashion that it might be confused with the original M.I.T. software. 237c478bd9Sstevel@tonic-gate * M.I.T. makes no representations about the suitability of 247c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express 257c478bd9Sstevel@tonic-gate * or implied warranty. 267c478bd9Sstevel@tonic-gate * 277c478bd9Sstevel@tonic-gate * 287c478bd9Sstevel@tonic-gate * krb5_encode_kdc_rep() function. 297c478bd9Sstevel@tonic-gate */ 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate #include <k5-int.h> 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate /* 347c478bd9Sstevel@tonic-gate Takes KDC rep parts in *rep and *encpart, and formats it into *enc_rep, 357c478bd9Sstevel@tonic-gate using message type type and encryption key client_key and encryption type 367c478bd9Sstevel@tonic-gate etype. 377c478bd9Sstevel@tonic-gate 387c478bd9Sstevel@tonic-gate The string *enc_rep will be allocated before formatting; the caller should 397c478bd9Sstevel@tonic-gate free when finished. 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate returns system errors 427c478bd9Sstevel@tonic-gate 437c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext is allocated and filled in. 447c478bd9Sstevel@tonic-gate */ 457c478bd9Sstevel@tonic-gate /* due to argument promotion rules, we need to use the DECLARG/OLDDECLARG 467c478bd9Sstevel@tonic-gate stuff... */ 477c478bd9Sstevel@tonic-gate krb5_error_code 48*505d05c7Sgtb krb5_encode_kdc_rep(krb5_context context, krb5_msgtype type, 49*505d05c7Sgtb const krb5_enc_kdc_rep_part *encpart, 50*505d05c7Sgtb int using_subkey, const krb5_keyblock *client_key, 51*505d05c7Sgtb krb5_kdc_rep *dec_rep, krb5_data **enc_rep) 527c478bd9Sstevel@tonic-gate { 537c478bd9Sstevel@tonic-gate krb5_data *scratch; 547c478bd9Sstevel@tonic-gate krb5_error_code retval; 557c478bd9Sstevel@tonic-gate krb5_enc_kdc_rep_part tmp_encpart; 567c478bd9Sstevel@tonic-gate krb5_keyusage usage; 577c478bd9Sstevel@tonic-gate 587c478bd9Sstevel@tonic-gate if (!valid_enctype(dec_rep->enc_part.enctype)) 597c478bd9Sstevel@tonic-gate return KRB5_PROG_ETYPE_NOSUPP; 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate switch (type) { 627c478bd9Sstevel@tonic-gate case KRB5_AS_REP: 637c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_AS_REP_ENCPART; 647c478bd9Sstevel@tonic-gate break; 657c478bd9Sstevel@tonic-gate case KRB5_TGS_REP: 667c478bd9Sstevel@tonic-gate if (using_subkey) 677c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY; 687c478bd9Sstevel@tonic-gate else 697c478bd9Sstevel@tonic-gate usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY; 707c478bd9Sstevel@tonic-gate break; 717c478bd9Sstevel@tonic-gate default: 727c478bd9Sstevel@tonic-gate return KRB5_BADMSGTYPE; 737c478bd9Sstevel@tonic-gate } 747c478bd9Sstevel@tonic-gate 757c478bd9Sstevel@tonic-gate /* 767c478bd9Sstevel@tonic-gate * We don't want to modify encpart, but we need to be able to pass 777c478bd9Sstevel@tonic-gate * in the message type to the encoder, so it can set the ASN.1 787c478bd9Sstevel@tonic-gate * type correct. 797c478bd9Sstevel@tonic-gate * 807c478bd9Sstevel@tonic-gate * Although note that it may be doing nothing with the message 817c478bd9Sstevel@tonic-gate * type, to be compatible with old versions of Kerberos that always 827c478bd9Sstevel@tonic-gate * encode this as a TGS_REP regardly of what it really should be; 837c478bd9Sstevel@tonic-gate * also note that the reason why we are passing it in a structure 847c478bd9Sstevel@tonic-gate * instead of as an argument to encode_krb5_enc_kdc_rep_part (the 857c478bd9Sstevel@tonic-gate * way we should) is for compatibility with the ISODE version of 867c478bd9Sstevel@tonic-gate * this fuction. Ah, compatibility.... 877c478bd9Sstevel@tonic-gate */ 887c478bd9Sstevel@tonic-gate tmp_encpart = *encpart; 897c478bd9Sstevel@tonic-gate tmp_encpart.msg_type = type; 907c478bd9Sstevel@tonic-gate retval = encode_krb5_enc_kdc_rep_part(&tmp_encpart, &scratch); 917c478bd9Sstevel@tonic-gate if (retval) { 927c478bd9Sstevel@tonic-gate return retval; 937c478bd9Sstevel@tonic-gate } 947c478bd9Sstevel@tonic-gate memset(&tmp_encpart, 0, sizeof(tmp_encpart)); 957c478bd9Sstevel@tonic-gate 967c478bd9Sstevel@tonic-gate #define cleanup_scratch() { (void) memset(scratch->data, 0, scratch->length); \ 977c478bd9Sstevel@tonic-gate krb5_free_data(context, scratch); } 987c478bd9Sstevel@tonic-gate 997c478bd9Sstevel@tonic-gate retval = krb5_encrypt_helper(context, client_key, usage, scratch, 1007c478bd9Sstevel@tonic-gate &dec_rep->enc_part); 1017c478bd9Sstevel@tonic-gate 1027c478bd9Sstevel@tonic-gate #define cleanup_encpart() { \ 1037c478bd9Sstevel@tonic-gate (void) memset(dec_rep->enc_part.ciphertext.data, 0, \ 1047c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.length); \ 1057c478bd9Sstevel@tonic-gate free(dec_rep->enc_part.ciphertext.data); \ 1067c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.length = 0; \ 1077c478bd9Sstevel@tonic-gate dec_rep->enc_part.ciphertext.data = 0;} 1087c478bd9Sstevel@tonic-gate 1097c478bd9Sstevel@tonic-gate cleanup_scratch(); 1107c478bd9Sstevel@tonic-gate 1117c478bd9Sstevel@tonic-gate if (retval) 1127c478bd9Sstevel@tonic-gate return(retval); 1137c478bd9Sstevel@tonic-gate 1147c478bd9Sstevel@tonic-gate /* now it's ready to be encoded for the wire! */ 1157c478bd9Sstevel@tonic-gate 1167c478bd9Sstevel@tonic-gate switch (type) { 1177c478bd9Sstevel@tonic-gate case KRB5_AS_REP: 1187c478bd9Sstevel@tonic-gate retval = encode_krb5_as_rep(dec_rep, enc_rep); 1197c478bd9Sstevel@tonic-gate break; 1207c478bd9Sstevel@tonic-gate case KRB5_TGS_REP: 1217c478bd9Sstevel@tonic-gate retval = encode_krb5_tgs_rep(dec_rep, enc_rep); 1227c478bd9Sstevel@tonic-gate break; 1237c478bd9Sstevel@tonic-gate } 1247c478bd9Sstevel@tonic-gate 1257c478bd9Sstevel@tonic-gate if (retval) 1267c478bd9Sstevel@tonic-gate cleanup_encpart(); 1277c478bd9Sstevel@tonic-gate 1287c478bd9Sstevel@tonic-gate return retval; 1297c478bd9Sstevel@tonic-gate } 130