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
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11 * notice, this list of conditions and the following disclaimer.
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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
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21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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35 RCSID("$Id: common.c 17450 2006-05-05 11:11:43Z lha $");
37 #if defined(KRB4) || defined(KRB5)
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_KRB4) {
79 return des_enc_read (fd, buf, sz, schedule, &iv);
83 if(auth_method == AUTH_KRB5) {
85 uint32_t len, outer_len;
90 ret = krb5_net_read (context, &fd, &len, 4);
96 /* ivec will be non null for protocol version 2 */
98 outer_len = krb5_get_wrapped_length (context, crypto, len + 4);
100 outer_len = krb5_get_wrapped_length (context, crypto, len);
101 edata = malloc (outer_len);
103 errx (1, "malloc: cannot allocate %u bytes", outer_len);
104 ret = krb5_net_read (context, &fd, edata, outer_len);
108 status = krb5_decrypt_ivec(context, crypto, key_usage,
109 edata, outer_len, &data, ivec);
113 krb5_err (context, 1, status, "decrypting data");
116 if(data.length < len + 4)
117 errx (1, "data received is too short");
118 _krb5_get_int(data.data, &l, 4);
120 errx (1, "inconsistency in received data");
121 memcpy (buf, (unsigned char *)data.data+4, len);
123 memcpy (buf, data.data, len);
124 krb5_data_free (&data);
130 return read (fd, buf, sz);
134 do_write (int fd, void *buf, size_t sz, void *ivec)
138 if(auth_method == AUTH_KRB4) {
139 return des_enc_write (fd, buf, sz, schedule, &iv);
143 if(auth_method == AUTH_KRB5) {
144 krb5_error_code status;
146 unsigned char len[4];
149 _krb5_put_int(len, sz, 4);
151 unsigned char *tmp = malloc(sz + 4);
154 _krb5_put_int(tmp, sz, 4);
155 memcpy(tmp + 4, buf, sz);
156 status = krb5_encrypt_ivec(context, crypto, key_usage,
157 tmp, sz + 4, &data, ivec);
160 status = krb5_encrypt_ivec(context, crypto, key_usage,
161 buf, sz, &data, ivec);
164 krb5_err(context, 1, status, "encrypting data");
166 ret = krb5_net_write (context, &fd, len, 4);
169 ret = krb5_net_write (context, &fd, data.data, data.length);
170 if (ret != data.length)
178 return write (fd, buf, sz);
180 #endif /* KRB4 || KRB5 */