2 Copyright (c) 2004 The Regents of the University of Michigan.
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
9 1. Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11 2. Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in the
13 documentation and/or other materials provided with the distribution.
14 3. Neither the name of the University nor the names of its
15 contributors may be used to endorse or promote products derived
16 from this software without specific prior written permission.
18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
25 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 #include "write_bytes.h"
47 #define MAX_CTX_LEN 4096
49 int write_heimdal_keyblock(char **p, char *end, krb5_keyblock *key)
54 if (WRITE_BYTES(p, end, key->keytype)) goto out_err;
55 tmp.length = key->keyvalue.length;
56 tmp.value = key->keyvalue.data;
57 if (write_buffer(p, end, &tmp)) goto out_err;
63 int write_heimdal_enc_key(char **p, char *end, gss_ctx_id_t ctx)
65 krb5_keyblock enc_key, *key;
72 if ((ret = krb5_init_context(&context))) {
73 printerr(0, "ERROR: initializing krb5_context: %s\n",
78 if ((ret = krb5_auth_con_getlocalsubkey(context,
79 ctx->auth_context, &key))){
80 printerr(0, "ERROR: getting auth_context key: %s\n",
82 goto out_err_free_context;
85 memset(&enc_key, 0, sizeof(enc_key));
86 printerr(1, "WARN: write_heimdal_enc_key: "
87 "overriding heimdal keytype\n");
88 enc_key.keytype = 4 /* XXX XXX XXX XXX key->keytype */;
89 enc_key.keyvalue.length = key->keyvalue.length;
90 if ((enc_key.keyvalue.data =
91 calloc(1, enc_key.keyvalue.length)) == NULL) {
93 printerr(0, "ERROR: allocating memory for enc key: %s\n",
94 error_message(ENOMEM));
95 goto out_err_free_key;
97 skd = (char *) key->keyvalue.data;
98 dkd = (char *) enc_key.keyvalue.data;
99 for (i = 0; i < enc_key.keyvalue.length; i++)
100 dkd[i] = skd[i] ^ 0xf0;
101 if (write_heimdal_keyblock(p, end, &enc_key)) {
102 goto out_err_free_enckey;
108 krb5_free_keyblock_contents(context, &enc_key);
110 krb5_free_keyblock(context, key);
111 out_err_free_context:
112 krb5_free_context(context);
114 printerr(2, "write_heimdal_enc_key: %s\n", code ? "FAILED" : "SUCCESS");
118 int write_heimdal_seq_key(char **p, char *end, gss_ctx_id_t ctx)
121 krb5_context context;
125 if ((ret = krb5_init_context(&context))) {
126 printerr(0, "ERROR: initializing krb5_context: %s\n",
131 if ((ret = krb5_auth_con_getlocalsubkey(context,
132 ctx->auth_context, &key))){
133 printerr(0, "ERROR: getting auth_context key: %s\n",
135 goto out_err_free_context;
138 printerr(1, "WARN: write_heimdal_seq_key: "
139 "overriding heimdal keytype\n");
140 key->keytype = 4; /* XXX XXX XXX XXX XXX */
142 if (write_heimdal_keyblock(p, end, key)) {
143 goto out_err_free_key;
149 krb5_free_keyblock(context, key);
150 out_err_free_context:
151 krb5_free_context(context);
153 printerr(2, "write_heimdal_seq_key: %s\n", code ? "FAILED" : "SUCCESS");
158 * The following is the kernel structure that we are filling in:
163 * unsigned char seed[16];
166 * struct crypto_tfm *enc;
167 * struct crypto_tfm *seq;
170 * struct xdr_netobj mech_used;
173 * However, note that we do not send the data fields in the
174 * order they appear in the structure. The order they are
191 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf)
195 static int constant_one = 1;
196 static int constant_zero = 0;
197 unsigned char fakeseed[16];
200 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
203 end = buf->value + MAX_CTX_LEN;
206 /* initiate: 1 => initiating 0 => accepting */
207 if (ctx->more_flags & LOCAL) {
208 if (WRITE_BYTES(&p, end, constant_one)) goto out_err;
211 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
214 /* seed_init: not used by kernel code */
215 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
217 /* seed: not used by kernel code */
218 memset(&fakeseed, 0, sizeof(fakeseed));
219 if (write_bytes(&p, end, &fakeseed, 16)) goto out_err;
222 algorithm = 0; /* SGN_ALG_DES_MAC_MD5 XXX */
223 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
226 algorithm = 0; /* SEAL_ALG_DES XXX */
227 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
230 if (WRITE_BYTES(&p, end, ctx->lifetime)) goto out_err;
233 if (WRITE_BYTES(&p, end, ctx->auth_context->local_seqnumber))
236 if (write_buffer(&p, end, (gss_buffer_desc*)&krb5oid)) goto out_err;
238 /* enc: derive the encryption key and copy it into buffer */
239 if (write_heimdal_enc_key(&p, end, ctx)) goto out_err;
241 /* seq: get the sequence number key and copy it into buffer */
242 if (write_heimdal_seq_key(&p, end, ctx)) goto out_err;
244 buf->length = p - (char *)buf->value;
245 printerr(2, "serialize_krb5_ctx: returning buffer "
246 "with %d bytes\n", buf->length);
250 printerr(0, "ERROR: failed exporting Heimdal krb5 ctx to kernel\n");
251 if (buf->value) free(buf->value);
256 #endif /* HAVE_HEIMDAL */