2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
46 init_ivecs(int client, int have_errsock)
50 krb5_crypto_getblocksize(context, crypto, &blocksize);
52 ivec_in[0] = malloc(blocksize);
53 memset(ivec_in[0], client, blocksize);
56 ivec_in[1] = malloc(blocksize);
57 memset(ivec_in[1], 2 | client, blocksize);
59 ivec_in[1] = ivec_in[0];
61 ivec_out[0] = malloc(blocksize);
62 memset(ivec_out[0], !client, blocksize);
65 ivec_out[1] = malloc(blocksize);
66 memset(ivec_out[1], 2 | !client, blocksize);
68 ivec_out[1] = ivec_out[0];
74 do_read (int fd, void *buf, size_t sz, void *ivec)
78 if(auth_method == AUTH_KRB5) {
80 uint32_t len, outer_len;
85 ret = krb5_net_read (context, &fd, &len, 4);
91 /* ivec will be non null for protocol version 2 */
93 outer_len = krb5_get_wrapped_length (context, crypto, len + 4);
95 outer_len = krb5_get_wrapped_length (context, crypto, len);
96 edata = malloc (outer_len);
98 errx (1, "malloc: cannot allocate %u bytes", outer_len);
99 ret = krb5_net_read (context, &fd, edata, outer_len);
105 status = krb5_decrypt_ivec(context, crypto, key_usage,
106 edata, outer_len, &data, ivec);
110 krb5_err (context, 1, status, "decrypting data");
113 if(data.length < len + 4)
114 errx (1, "data received is too short");
115 _krb5_get_int(data.data, &l, 4);
117 errx (1, "inconsistency in received data");
118 memcpy (buf, (unsigned char *)data.data+4, len);
120 memcpy (buf, data.data, len);
121 krb5_data_free (&data);
127 return read (fd, buf, sz);
131 do_write (int fd, void *buf, size_t sz, void *ivec)
135 if(auth_method == AUTH_KRB5) {
136 krb5_error_code status;
138 unsigned char len[4];
141 _krb5_put_int(len, sz, 4);
143 unsigned char *tmp = malloc(sz + 4);
146 _krb5_put_int(tmp, sz, 4);
147 memcpy(tmp + 4, buf, sz);
148 status = krb5_encrypt_ivec(context, crypto, key_usage,
149 tmp, sz + 4, &data, ivec);
152 status = krb5_encrypt_ivec(context, crypto, key_usage,
153 buf, sz, &data, ivec);
156 krb5_err(context, 1, status, "encrypting data");
158 ret = krb5_net_write (context, &fd, len, 4);
161 ret = krb5_net_write (context, &fd, data.data, data.length);
162 if (ret != data.length)
170 return write (fd, buf, sz);