2 Copyright (c) 2004-2006 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
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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.
33 #endif /* HAVE_CONFIG_H */
35 #ifndef HAVE_LUCID_CONTEXT_SUPPORT
44 #include <gssapi.h> /* Must use the heimdal copy! */
50 #include "write_bytes.h"
52 int write_heimdal_keyblock(char **p, char *end, krb5_keyblock *key)
57 if (WRITE_BYTES(p, end, key->keytype)) goto out_err;
58 tmp.length = key->keyvalue.length;
59 tmp.value = key->keyvalue.data;
60 if (write_buffer(p, end, &tmp)) goto out_err;
66 int write_heimdal_enc_key(char **p, char *end, gss_ctx_id_t ctx)
68 krb5_keyblock enc_key, *key;
75 if ((ret = krb5_init_context(&context))) {
76 printerr(0, "ERROR: initializing krb5_context: %s\n",
77 gssd_k5_err_msg(NULL, ret));
81 if ((ret = krb5_auth_con_getlocalsubkey(context,
82 ctx->auth_context, &key))){
83 printerr(0, "ERROR: getting auth_context key: %s\n",
84 gssd_k5_err_msg(context, ret));
85 goto out_err_free_context;
88 memset(&enc_key, 0, sizeof(enc_key));
89 enc_key.keytype = key->keytype;
90 /* XXX current kernel code only handles des-cbc-raw (4) */
91 if (enc_key.keytype != 4) {
92 printerr(1, "WARN: write_heimdal_enc_key: "
93 "overriding heimdal keytype (%d => %d)\n",
97 enc_key.keyvalue.length = key->keyvalue.length;
98 if ((enc_key.keyvalue.data =
99 calloc(1, enc_key.keyvalue.length)) == NULL) {
101 printerr(0, "ERROR: allocating memory for enc key: %s\n",
102 gssd_k5_err_msg(context, ENOMEM));
103 goto out_err_free_key;
105 skd = (char *) key->keyvalue.data;
106 dkd = (char *) enc_key.keyvalue.data;
107 for (i = 0; i < enc_key.keyvalue.length; i++)
108 dkd[i] = skd[i] ^ 0xf0;
109 if (write_heimdal_keyblock(p, end, &enc_key)) {
110 goto out_err_free_enckey;
116 krb5_free_keyblock_contents(context, &enc_key);
118 krb5_free_keyblock(context, key);
119 out_err_free_context:
120 krb5_free_context(context);
122 printerr(2, "write_heimdal_enc_key: %s\n", code ? "FAILED" : "SUCCESS");
126 int write_heimdal_seq_key(char **p, char *end, gss_ctx_id_t ctx)
129 krb5_context context;
133 if ((ret = krb5_init_context(&context))) {
134 printerr(0, "ERROR: initializing krb5_context: %s\n",
135 gssd_k5_err_msg(NULL, ret));
139 if ((ret = krb5_auth_con_getlocalsubkey(context,
140 ctx->auth_context, &key))){
141 printerr(0, "ERROR: getting auth_context key: %s\n",
142 gssd_k5_err_msg(context, ret));
143 goto out_err_free_context;
146 /* XXX current kernel code only handles des-cbc-raw (4) */
147 if (key->keytype != 4) {
148 printerr(1, "WARN: write_heimdal_seq_key: "
149 "overriding heimdal keytype (%d => %d)\n",
154 if (write_heimdal_keyblock(p, end, key)) {
155 goto out_err_free_key;
161 krb5_free_keyblock(context, key);
162 out_err_free_context:
163 krb5_free_context(context);
165 printerr(2, "write_heimdal_seq_key: %s\n", code ? "FAILED" : "SUCCESS");
170 * The following is the kernel structure that we are filling in:
175 * unsigned char seed[16];
178 * struct crypto_tfm *enc;
179 * struct crypto_tfm *seq;
182 * struct xdr_netobj mech_used;
185 * However, note that we do not send the data fields in the
186 * order they appear in the structure. The order they are
203 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf, int32_t *endtime)
207 static int constant_one = 1;
208 static int constant_zero = 0;
209 unsigned char fakeseed[16];
212 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
215 end = buf->value + MAX_CTX_LEN;
218 /* initiate: 1 => initiating 0 => accepting */
219 if (ctx->more_flags & LOCAL) {
220 if (WRITE_BYTES(&p, end, constant_one)) goto out_err;
223 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
226 /* seed_init: not used by kernel code */
227 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
229 /* seed: not used by kernel code */
230 memset(&fakeseed, 0, sizeof(fakeseed));
231 if (write_bytes(&p, end, &fakeseed, 16)) goto out_err;
234 algorithm = 0; /* SGN_ALG_DES_MAC_MD5 XXX */
235 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
238 algorithm = 0; /* SEAL_ALG_DES XXX */
239 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
242 if (WRITE_BYTES(&p, end, ctx->lifetime)) goto out_err;
245 *endtime = ctx->lifetime;
248 if (WRITE_BYTES(&p, end, ctx->auth_context->local_seqnumber))
251 if (write_buffer(&p, end, (gss_buffer_desc*)&krb5oid)) goto out_err;
253 /* enc: derive the encryption key and copy it into buffer */
254 if (write_heimdal_enc_key(&p, end, ctx)) goto out_err;
256 /* seq: get the sequence number key and copy it into buffer */
257 if (write_heimdal_seq_key(&p, end, ctx)) goto out_err;
259 buf->length = p - (char *)buf->value;
260 printerr(2, "serialize_krb5_ctx: returning buffer "
261 "with %d bytes\n", buf->length);
265 printerr(0, "ERROR: failed exporting Heimdal krb5 ctx to kernel\n");
266 if (buf->value) free(buf->value);
271 #endif /* HAVE_HEIMDAL */
272 #endif /* HAVE_LUCID_CONTEXT_SUPPORT */