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.
41 #include <gssapi.h> /* Must use the heimdal copy! */
47 #include "write_bytes.h"
49 #define MAX_CTX_LEN 4096
51 int write_heimdal_keyblock(char **p, char *end, krb5_keyblock *key)
56 if (WRITE_BYTES(p, end, key->keytype)) goto out_err;
57 tmp.length = key->keyvalue.length;
58 tmp.value = key->keyvalue.data;
59 if (write_buffer(p, end, &tmp)) goto out_err;
65 int write_heimdal_enc_key(char **p, char *end, gss_ctx_id_t ctx)
67 krb5_keyblock enc_key, *key;
74 if ((ret = krb5_init_context(&context))) {
75 printerr(0, "ERROR: initializing krb5_context: %s\n",
80 if ((ret = krb5_auth_con_getlocalsubkey(context,
81 ctx->auth_context, &key))){
82 printerr(0, "ERROR: getting auth_context key: %s\n",
84 goto out_err_free_context;
87 memset(&enc_key, 0, sizeof(enc_key));
88 enc_key.keytype = key->keytype;
89 /* XXX current kernel code only handles des-cbc-raw (4) */
90 if (enc_key.keytype != 4) {
91 printerr(1, "WARN: write_heimdal_enc_key: "
92 "overriding heimdal keytype (%d => %d)\n",
96 enc_key.keyvalue.length = key->keyvalue.length;
97 if ((enc_key.keyvalue.data =
98 calloc(1, enc_key.keyvalue.length)) == NULL) {
100 printerr(0, "ERROR: allocating memory for enc key: %s\n",
101 error_message(ENOMEM));
102 goto out_err_free_key;
104 skd = (char *) key->keyvalue.data;
105 dkd = (char *) enc_key.keyvalue.data;
106 for (i = 0; i < enc_key.keyvalue.length; i++)
107 dkd[i] = skd[i] ^ 0xf0;
108 if (write_heimdal_keyblock(p, end, &enc_key)) {
109 goto out_err_free_enckey;
115 krb5_free_keyblock_contents(context, &enc_key);
117 krb5_free_keyblock(context, key);
118 out_err_free_context:
119 krb5_free_context(context);
121 printerr(2, "write_heimdal_enc_key: %s\n", code ? "FAILED" : "SUCCESS");
125 int write_heimdal_seq_key(char **p, char *end, gss_ctx_id_t ctx)
128 krb5_context context;
132 if ((ret = krb5_init_context(&context))) {
133 printerr(0, "ERROR: initializing krb5_context: %s\n",
138 if ((ret = krb5_auth_con_getlocalsubkey(context,
139 ctx->auth_context, &key))){
140 printerr(0, "ERROR: getting auth_context key: %s\n",
142 goto out_err_free_context;
145 /* XXX current kernel code only handles des-cbc-raw (4) */
146 if (key->keytype != 4) {
147 printerr(1, "WARN: write_heimdal_seq_key: "
148 "overriding heimdal keytype (%d => %d)\n",
153 if (write_heimdal_keyblock(p, end, key)) {
154 goto out_err_free_key;
160 krb5_free_keyblock(context, key);
161 out_err_free_context:
162 krb5_free_context(context);
164 printerr(2, "write_heimdal_seq_key: %s\n", code ? "FAILED" : "SUCCESS");
169 * The following is the kernel structure that we are filling in:
174 * unsigned char seed[16];
177 * struct crypto_tfm *enc;
178 * struct crypto_tfm *seq;
181 * struct xdr_netobj mech_used;
184 * However, note that we do not send the data fields in the
185 * order they appear in the structure. The order they are
202 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf)
206 static int constant_one = 1;
207 static int constant_zero = 0;
208 unsigned char fakeseed[16];
211 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
214 end = buf->value + MAX_CTX_LEN;
217 /* initiate: 1 => initiating 0 => accepting */
218 if (ctx->more_flags & LOCAL) {
219 if (WRITE_BYTES(&p, end, constant_one)) goto out_err;
222 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
225 /* seed_init: not used by kernel code */
226 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
228 /* seed: not used by kernel code */
229 memset(&fakeseed, 0, sizeof(fakeseed));
230 if (write_bytes(&p, end, &fakeseed, 16)) goto out_err;
233 algorithm = 0; /* SGN_ALG_DES_MAC_MD5 XXX */
234 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
237 algorithm = 0; /* SEAL_ALG_DES XXX */
238 if (WRITE_BYTES(&p, end, algorithm)) goto out_err;
241 if (WRITE_BYTES(&p, end, ctx->lifetime)) goto out_err;
244 if (WRITE_BYTES(&p, end, ctx->auth_context->local_seqnumber))
247 if (write_buffer(&p, end, (gss_buffer_desc*)&krb5oid)) goto out_err;
249 /* enc: derive the encryption key and copy it into buffer */
250 if (write_heimdal_enc_key(&p, end, ctx)) goto out_err;
252 /* seq: get the sequence number key and copy it into buffer */
253 if (write_heimdal_seq_key(&p, end, ctx)) goto out_err;
255 buf->length = p - (char *)buf->value;
256 printerr(2, "serialize_krb5_ctx: returning buffer "
257 "with %d bytes\n", buf->length);
261 printerr(0, "ERROR: failed exporting Heimdal krb5 ctx to kernel\n");
262 if (buf->value) free(buf->value);
267 #endif /* HAVE_HEIMDAL */