1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 3*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 4*7c478bd9Sstevel@tonic-gate */ 5*7c478bd9Sstevel@tonic-gate 6*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 7*7c478bd9Sstevel@tonic-gate 8*7c478bd9Sstevel@tonic-gate /* 9*7c478bd9Sstevel@tonic-gate * lib/krb5/krb/rd_rep.c 10*7c478bd9Sstevel@tonic-gate * 11*7c478bd9Sstevel@tonic-gate * Copyright 1990,1991 by the Massachusetts Institute of Technology. 12*7c478bd9Sstevel@tonic-gate * All Rights Reserved. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may 15*7c478bd9Sstevel@tonic-gate * require a specific license from the United States Government. 16*7c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating 17*7c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting. 18*7c478bd9Sstevel@tonic-gate * 19*7c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 20*7c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and 21*7c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright 22*7c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and 23*7c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that 24*7c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining 25*7c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior 26*7c478bd9Sstevel@tonic-gate * permission. Furthermore if you modify this software you must label 27*7c478bd9Sstevel@tonic-gate * your software as modified software and not distribute it in such a 28*7c478bd9Sstevel@tonic-gate * fashion that it might be confused with the original M.I.T. software. 29*7c478bd9Sstevel@tonic-gate * M.I.T. makes no representations about the suitability of 30*7c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express 31*7c478bd9Sstevel@tonic-gate * or implied warranty. 32*7c478bd9Sstevel@tonic-gate * 33*7c478bd9Sstevel@tonic-gate * 34*7c478bd9Sstevel@tonic-gate * krb5_rd_rep() 35*7c478bd9Sstevel@tonic-gate */ 36*7c478bd9Sstevel@tonic-gate 37*7c478bd9Sstevel@tonic-gate #include <k5-int.h> 38*7c478bd9Sstevel@tonic-gate #include <auth_con.h> 39*7c478bd9Sstevel@tonic-gate 40*7c478bd9Sstevel@tonic-gate /* 41*7c478bd9Sstevel@tonic-gate * Parses a KRB_AP_REP message, returning its contents. 42*7c478bd9Sstevel@tonic-gate * 43*7c478bd9Sstevel@tonic-gate * repl is filled in with with a pointer to allocated memory containing 44*7c478bd9Sstevel@tonic-gate * the fields from the encrypted response. 45*7c478bd9Sstevel@tonic-gate * 46*7c478bd9Sstevel@tonic-gate * the key in kblock is used to decrypt the message. 47*7c478bd9Sstevel@tonic-gate * 48*7c478bd9Sstevel@tonic-gate * returns system errors, encryption errors, replay errors 49*7c478bd9Sstevel@tonic-gate */ 50*7c478bd9Sstevel@tonic-gate 51*7c478bd9Sstevel@tonic-gate krb5_error_code KRB5_CALLCONV 52*7c478bd9Sstevel@tonic-gate krb5_rd_rep( 53*7c478bd9Sstevel@tonic-gate krb5_context context, 54*7c478bd9Sstevel@tonic-gate krb5_auth_context auth_context, 55*7c478bd9Sstevel@tonic-gate const krb5_data * inbuf, 56*7c478bd9Sstevel@tonic-gate krb5_ap_rep_enc_part * *repl) 57*7c478bd9Sstevel@tonic-gate { 58*7c478bd9Sstevel@tonic-gate krb5_error_code retval; 59*7c478bd9Sstevel@tonic-gate krb5_ap_rep * reply; 60*7c478bd9Sstevel@tonic-gate krb5_data scratch; 61*7c478bd9Sstevel@tonic-gate 62*7c478bd9Sstevel@tonic-gate if (!krb5_is_ap_rep(inbuf)) 63*7c478bd9Sstevel@tonic-gate return KRB5KRB_AP_ERR_MSG_TYPE; 64*7c478bd9Sstevel@tonic-gate 65*7c478bd9Sstevel@tonic-gate /* decode it */ 66*7c478bd9Sstevel@tonic-gate 67*7c478bd9Sstevel@tonic-gate if ((retval = decode_krb5_ap_rep(inbuf, &reply))) 68*7c478bd9Sstevel@tonic-gate return retval; 69*7c478bd9Sstevel@tonic-gate 70*7c478bd9Sstevel@tonic-gate /* put together an eblock for this encryption */ 71*7c478bd9Sstevel@tonic-gate 72*7c478bd9Sstevel@tonic-gate scratch.length = reply->enc_part.ciphertext.length; 73*7c478bd9Sstevel@tonic-gate if (!(scratch.data = malloc(scratch.length))) { 74*7c478bd9Sstevel@tonic-gate krb5_free_ap_rep(context, reply); 75*7c478bd9Sstevel@tonic-gate return(ENOMEM); 76*7c478bd9Sstevel@tonic-gate } 77*7c478bd9Sstevel@tonic-gate 78*7c478bd9Sstevel@tonic-gate retval = krb5_c_decrypt(context, auth_context->keyblock, 79*7c478bd9Sstevel@tonic-gate KRB5_KEYUSAGE_AP_REP_ENCPART, 0, 80*7c478bd9Sstevel@tonic-gate &reply->enc_part, &scratch); 81*7c478bd9Sstevel@tonic-gate if (retval) 82*7c478bd9Sstevel@tonic-gate goto clean_scratch; 83*7c478bd9Sstevel@tonic-gate 84*7c478bd9Sstevel@tonic-gate /* now decode the decrypted stuff */ 85*7c478bd9Sstevel@tonic-gate retval = decode_krb5_ap_rep_enc_part(&scratch, repl); 86*7c478bd9Sstevel@tonic-gate 87*7c478bd9Sstevel@tonic-gate if (retval) 88*7c478bd9Sstevel@tonic-gate goto clean_scratch; 89*7c478bd9Sstevel@tonic-gate 90*7c478bd9Sstevel@tonic-gate /* Check reply fields */ 91*7c478bd9Sstevel@tonic-gate if (((*repl)->ctime != auth_context->authentp->ctime) || 92*7c478bd9Sstevel@tonic-gate ((*repl)->cusec != auth_context->authentp->cusec)) { 93*7c478bd9Sstevel@tonic-gate retval = KRB5_MUTUAL_FAILED; 94*7c478bd9Sstevel@tonic-gate goto clean_scratch; 95*7c478bd9Sstevel@tonic-gate } 96*7c478bd9Sstevel@tonic-gate 97*7c478bd9Sstevel@tonic-gate /* Set auth subkey */ 98*7c478bd9Sstevel@tonic-gate if ((*repl)->subkey) { 99*7c478bd9Sstevel@tonic-gate if (auth_context->recv_subkey) { 100*7c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->recv_subkey); 101*7c478bd9Sstevel@tonic-gate auth_context->recv_subkey = NULL; 102*7c478bd9Sstevel@tonic-gate } 103*7c478bd9Sstevel@tonic-gate retval = krb5_copy_keyblock(context, (*repl)->subkey, 104*7c478bd9Sstevel@tonic-gate &auth_context->recv_subkey); 105*7c478bd9Sstevel@tonic-gate if (retval) 106*7c478bd9Sstevel@tonic-gate goto clean_scratch; 107*7c478bd9Sstevel@tonic-gate if (auth_context->send_subkey) { 108*7c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->send_subkey); 109*7c478bd9Sstevel@tonic-gate auth_context->send_subkey = NULL; 110*7c478bd9Sstevel@tonic-gate } 111*7c478bd9Sstevel@tonic-gate retval = krb5_copy_keyblock(context, (*repl)->subkey, 112*7c478bd9Sstevel@tonic-gate &auth_context->send_subkey); 113*7c478bd9Sstevel@tonic-gate if (retval) { 114*7c478bd9Sstevel@tonic-gate krb5_free_keyblock(context, auth_context->send_subkey); 115*7c478bd9Sstevel@tonic-gate auth_context->send_subkey = NULL; 116*7c478bd9Sstevel@tonic-gate } 117*7c478bd9Sstevel@tonic-gate } 118*7c478bd9Sstevel@tonic-gate /* Get remote sequence number */ 119*7c478bd9Sstevel@tonic-gate auth_context->remote_seq_number = (*repl)->seq_number; 120*7c478bd9Sstevel@tonic-gate 121*7c478bd9Sstevel@tonic-gate clean_scratch: 122*7c478bd9Sstevel@tonic-gate memset(scratch.data, 0, scratch.length); 123*7c478bd9Sstevel@tonic-gate errout: 124*7c478bd9Sstevel@tonic-gate krb5_free_ap_rep(context, reply); 125*7c478bd9Sstevel@tonic-gate free(scratch.data); 126*7c478bd9Sstevel@tonic-gate return retval; 127*7c478bd9Sstevel@tonic-gate } 128