1/* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "krb5_locl.h" 35 36KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 37krb5_read_message (krb5_context context, 38 krb5_pointer p_fd, 39 krb5_data *data) 40{ 41 krb5_error_code ret; 42 krb5_ssize_t sret; 43 uint32_t len; 44 uint8_t buf[4]; 45 46 krb5_data_zero(data); 47 48 sret = krb5_net_read (context, p_fd, buf, 4); 49 if(sret == -1) { 50 ret = errno; 51 krb5_clear_error_message (context); 52 return ret; 53 } 54 if(sret < 4) { 55 krb5_clear_error_message(context); 56 return HEIM_ERR_EOF; 57 } 58 len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; 59 if (len > UINT_MAX / 16) { 60 krb5_set_error_message(context, ERANGE, N_("packet to large", "")); 61 return ERANGE; 62 } 63 ret = krb5_data_alloc (data, len); 64 if (ret) { 65 krb5_clear_error_message(context); 66 return ret; 67 } 68 if (krb5_net_read (context, p_fd, data->data, len) != (ssize_t)len) { 69 ret = errno; 70 krb5_data_free (data); 71 krb5_clear_error_message (context); 72 return ret; 73 } 74 return 0; 75} 76 77KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 78krb5_read_priv_message(krb5_context context, 79 krb5_auth_context ac, 80 krb5_pointer p_fd, 81 krb5_data *data) 82{ 83 krb5_error_code ret; 84 krb5_data packet; 85 86 ret = krb5_read_message(context, p_fd, &packet); 87 if(ret) 88 return ret; 89 ret = krb5_rd_priv (context, ac, &packet, data, NULL); 90 krb5_data_free(&packet); 91 return ret; 92} 93 94KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 95krb5_read_safe_message(krb5_context context, 96 krb5_auth_context ac, 97 krb5_pointer p_fd, 98 krb5_data *data) 99{ 100 krb5_error_code ret; 101 krb5_data packet; 102 103 ret = krb5_read_message(context, p_fd, &packet); 104 if(ret) 105 return ret; 106 ret = krb5_rd_safe (context, ac, &packet, data, NULL); 107 krb5_data_free(&packet); 108 return ret; 109} 110