2 * Copyright (c) 1997 - 1999, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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35 RCSID("$Id: common.c,v 1.16 2002/09/04 15:50:36 assar Exp $");
37 #if defined(KRB4) || defined(KRB5)
46 init_ivecs(int client)
50 krb5_crypto_getblocksize(context, crypto, &blocksize);
52 ivec_in[0] = malloc(blocksize);
53 memset(ivec_in[0], client, blocksize);
55 ivec_in[1] = malloc(blocksize);
56 memset(ivec_in[1], 2 | client, blocksize);
58 ivec_out[0] = malloc(blocksize);
59 memset(ivec_out[0], !client, blocksize);
61 ivec_out[1] = malloc(blocksize);
62 memset(ivec_out[1], 2 | !client, blocksize);
68 do_read (int fd, void *buf, size_t sz, void *ivec)
72 if (auth_method == AUTH_KRB4) {
73 return des_enc_read (fd, buf, sz, schedule, &iv);
77 if(auth_method == AUTH_KRB5) {
79 u_int32_t len, outer_len;
84 ret = krb5_net_read (context, &fd, &len, 4);
90 /* ivec will be non null for protocol version 2 */
92 outer_len = krb5_get_wrapped_length (context, crypto, len + 4);
94 outer_len = krb5_get_wrapped_length (context, crypto, len);
95 edata = malloc (outer_len);
97 errx (1, "malloc: cannot allocate %u bytes", outer_len);
98 ret = krb5_net_read (context, &fd, edata, outer_len);
102 status = krb5_decrypt_ivec(context, crypto, key_usage,
103 edata, outer_len, &data, ivec);
107 krb5_err (context, 1, status, "decrypting data");
110 if(data.length < len + 4)
111 errx (1, "data received is too short");
112 _krb5_get_int(data.data, &l, 4);
114 errx (1, "inconsistency in received data");
115 memcpy (buf, (unsigned char *)data.data+4, len);
117 memcpy (buf, data.data, len);
118 krb5_data_free (&data);
124 return read (fd, buf, sz);
128 do_write (int fd, void *buf, size_t sz, void *ivec)
132 if(auth_method == AUTH_KRB4) {
133 return des_enc_write (fd, buf, sz, schedule, &iv);
137 if(auth_method == AUTH_KRB5) {
138 krb5_error_code status;
140 unsigned char len[4];
143 _krb5_put_int(len, sz, 4);
145 unsigned char *tmp = malloc(sz + 4);
148 _krb5_put_int(tmp, sz, 4);
149 memcpy(tmp + 4, buf, sz);
150 status = krb5_encrypt_ivec(context, crypto, key_usage,
151 tmp, sz + 4, &data, ivec);
154 status = krb5_encrypt_ivec(context, crypto, key_usage,
155 buf, sz, &data, ivec);
158 krb5_err(context, 1, status, "encrypting data");
160 ret = krb5_net_write (context, &fd, len, 4);
163 ret = krb5_net_write (context, &fd, data.data, data.length);
164 if (ret != data.length)
172 return write (fd, buf, sz);
174 #endif /* KRB4 || KRB5 */