1 /* $NetBSD: read_message.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37
38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_read_message(krb5_context context,krb5_pointer p_fd,krb5_data * data)39 krb5_read_message (krb5_context context,
40 krb5_pointer p_fd,
41 krb5_data *data)
42 {
43 krb5_error_code ret;
44 uint32_t len;
45 uint8_t buf[4];
46
47 krb5_data_zero(data);
48
49 ret = krb5_net_read (context, p_fd, buf, 4);
50 if(ret == -1) {
51 ret = errno;
52 krb5_clear_error_message (context);
53 return ret;
54 }
55 if(ret < 4) {
56 krb5_clear_error_message(context);
57 return HEIM_ERR_EOF;
58 }
59 len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
60 ret = krb5_data_alloc (data, len);
61 if (ret) {
62 krb5_clear_error_message(context);
63 return ret;
64 }
65 if (krb5_net_read (context, p_fd, data->data, len) != len) {
66 ret = errno;
67 krb5_data_free (data);
68 krb5_clear_error_message (context);
69 return ret;
70 }
71 return 0;
72 }
73
74 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_read_priv_message(krb5_context context,krb5_auth_context ac,krb5_pointer p_fd,krb5_data * data)75 krb5_read_priv_message(krb5_context context,
76 krb5_auth_context ac,
77 krb5_pointer p_fd,
78 krb5_data *data)
79 {
80 krb5_error_code ret;
81 krb5_data packet;
82
83 ret = krb5_read_message(context, p_fd, &packet);
84 if(ret)
85 return ret;
86 ret = krb5_rd_priv (context, ac, &packet, data, NULL);
87 krb5_data_free(&packet);
88 return ret;
89 }
90
91 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_read_safe_message(krb5_context context,krb5_auth_context ac,krb5_pointer p_fd,krb5_data * data)92 krb5_read_safe_message(krb5_context context,
93 krb5_auth_context ac,
94 krb5_pointer p_fd,
95 krb5_data *data)
96 {
97 krb5_error_code ret;
98 krb5_data packet;
99
100 ret = krb5_read_message(context, p_fd, &packet);
101 if(ret)
102 return ret;
103 ret = krb5_rd_safe (context, ac, &packet, data, NULL);
104 krb5_data_free(&packet);
105 return ret;
106 }
107