17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * lib/krb5/krb/rd_rep.c 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * Copyright 1990,1991 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_rd_rep() 287c478bd9Sstevel@tonic-gate */ 297c478bd9Sstevel@tonic-gate 30*159d09a2SMark Phalan #include "k5-int.h" 31*159d09a2SMark Phalan #include "auth_con.h" 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate /* 347c478bd9Sstevel@tonic-gate * Parses a KRB_AP_REP message, returning its contents. 357c478bd9Sstevel@tonic-gate * 367c478bd9Sstevel@tonic-gate * repl is filled in with with a pointer to allocated memory containing 377c478bd9Sstevel@tonic-gate * the fields from the encrypted response. 387c478bd9Sstevel@tonic-gate * 397c478bd9Sstevel@tonic-gate * the key in kblock is used to decrypt the message. 407c478bd9Sstevel@tonic-gate * 417c478bd9Sstevel@tonic-gate * returns system errors, encryption errors, replay errors 427c478bd9Sstevel@tonic-gate */ 437c478bd9Sstevel@tonic-gate 447c478bd9Sstevel@tonic-gate krb5_error_code KRB5_CALLCONV 45*159d09a2SMark Phalan krb5_rd_rep(krb5_context context, krb5_auth_context auth_context, const krb5_data *inbuf, krb5_ap_rep_enc_part **repl) 467c478bd9Sstevel@tonic-gate { 477c478bd9Sstevel@tonic-gate krb5_error_code retval; 487c478bd9Sstevel@tonic-gate krb5_ap_rep * reply; 497c478bd9Sstevel@tonic-gate krb5_data scratch; 507c478bd9Sstevel@tonic-gate 517c478bd9Sstevel@tonic-gate if (!krb5_is_ap_rep(inbuf)) 527c478bd9Sstevel@tonic-gate return KRB5KRB_AP_ERR_MSG_TYPE; 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate /* decode it */ 557c478bd9Sstevel@tonic-gate 567c478bd9Sstevel@tonic-gate if ((retval = decode_krb5_ap_rep(inbuf, &reply))) 577c478bd9Sstevel@tonic-gate return retval; 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate /* put together an eblock for this encryption */ 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate scratch.length = reply->enc_part.ciphertext.length; 627c478bd9Sstevel@tonic-gate if (!(scratch.data = malloc(scratch.length))) { 637c478bd9Sstevel@tonic-gate krb5_free_ap_rep(context, reply); 647c478bd9Sstevel@tonic-gate return(ENOMEM); 657c478bd9Sstevel@tonic-gate } 667c478bd9Sstevel@tonic-gate 67*159d09a2SMark Phalan if ((retval = krb5_c_decrypt(context, auth_context->keyblock, 687c478bd9Sstevel@tonic-gate KRB5_KEYUSAGE_AP_REP_ENCPART, 0, 69*159d09a2SMark Phalan &reply->enc_part, &scratch))) 707c478bd9Sstevel@tonic-gate goto clean_scratch; 717c478bd9Sstevel@tonic-gate 727c478bd9Sstevel@tonic-gate /* now decode the decrypted stuff */ 737c478bd9Sstevel@tonic-gate retval = decode_krb5_ap_rep_enc_part(&scratch, repl); 747c478bd9Sstevel@tonic-gate if (retval) 757c478bd9Sstevel@tonic-gate goto clean_scratch; 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate /* Check reply fields */ 787c478bd9Sstevel@tonic-gate if (((*repl)->ctime != auth_context->authentp->ctime) || 797c478bd9Sstevel@tonic-gate ((*repl)->cusec != auth_context->authentp->cusec)) { 807c478bd9Sstevel@tonic-gate retval = KRB5_MUTUAL_FAILED; 817c478bd9Sstevel@tonic-gate goto clean_scratch; 827c478bd9Sstevel@tonic-gate } 837c478bd9Sstevel@tonic-gate 847c478bd9Sstevel@tonic-gate /* Set auth subkey */ 857c478bd9Sstevel@tonic-gate if ((*repl)->subkey) { 867c478bd9Sstevel@tonic-gate if (auth_context->recv_subkey) { 877c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->recv_subkey); 887c478bd9Sstevel@tonic-gate auth_context->recv_subkey = NULL; 897c478bd9Sstevel@tonic-gate } 907c478bd9Sstevel@tonic-gate retval = krb5_copy_keyblock(context, (*repl)->subkey, 917c478bd9Sstevel@tonic-gate &auth_context->recv_subkey); 927c478bd9Sstevel@tonic-gate if (retval) 937c478bd9Sstevel@tonic-gate goto clean_scratch; 947c478bd9Sstevel@tonic-gate if (auth_context->send_subkey) { 957c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->send_subkey); 967c478bd9Sstevel@tonic-gate auth_context->send_subkey = NULL; 977c478bd9Sstevel@tonic-gate } 987c478bd9Sstevel@tonic-gate retval = krb5_copy_keyblock(context, (*repl)->subkey, 997c478bd9Sstevel@tonic-gate &auth_context->send_subkey); 1007c478bd9Sstevel@tonic-gate if (retval) { 1017c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->send_subkey); 1027c478bd9Sstevel@tonic-gate auth_context->send_subkey = NULL; 1037c478bd9Sstevel@tonic-gate } 1047c478bd9Sstevel@tonic-gate } 105*159d09a2SMark Phalan 1067c478bd9Sstevel@tonic-gate /* Get remote sequence number */ 1077c478bd9Sstevel@tonic-gate auth_context->remote_seq_number = (*repl)->seq_number; 1087c478bd9Sstevel@tonic-gate 1097c478bd9Sstevel@tonic-gate clean_scratch: 1107c478bd9Sstevel@tonic-gate memset(scratch.data, 0, scratch.length); 111*159d09a2SMark Phalan 1127c478bd9Sstevel@tonic-gate krb5_free_ap_rep(context, reply); 1137c478bd9Sstevel@tonic-gate free(scratch.data); 1147c478bd9Sstevel@tonic-gate return retval; 1157c478bd9Sstevel@tonic-gate } 116