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17 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
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21 * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
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27 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
33 #ifdef HAVE_LUCID_CONTEXT_SUPPORT
36 * Newer versions of MIT and Heimdal have lucid context support.
37 * We can use common code if it is supported.
49 #include <gssapi/gssapi.h>
51 typedef uint64_t OM_uint64;
53 #include <gssapi/gssapi_krb5.h>
56 write_lucid_keyblock(char **p, char *end, gss_krb5_lucid_key_t *key)
60 if (WRITE_BYTES(p, end, key->type)) return -1;
61 tmp.length = key->length;
62 tmp.value = key->data;
63 if (write_buffer(p, end, &tmp)) return -1;
68 prepare_krb5_rfc1964_buffer(gss_krb5_lucid_context_v1_t *lctx,
69 gss_buffer_desc *buf, int32_t *endtime)
72 static int constant_zero = 0;
73 unsigned char fakeseed[16];
74 uint32_t word_send_seq;
75 gss_krb5_lucid_key_t enc_key;
78 gss_buffer_desc fakeoid;
81 * The new Kerberos interface to get the gss context
82 * does not include the seed or seed_init fields
83 * because we never really use them. But for now,
84 * send down a fake buffer so we can use the same
85 * interface to the kernel.
87 memset(&enc_key, 0, sizeof(enc_key));
88 memset(&fakeoid, 0, sizeof(fakeoid));
90 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
93 end = buf->value + MAX_CTX_LEN;
95 if (WRITE_BYTES(&p, end, lctx->initiate)) goto out_err;
97 /* seed_init and seed not used by kernel anyway */
98 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
99 if (write_bytes(&p, end, &fakeseed, 16)) goto out_err;
101 if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.sign_alg)) goto out_err;
102 if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.seal_alg)) goto out_err;
103 if (WRITE_BYTES(&p, end, lctx->endtime)) goto out_err;
105 *endtime = lctx->endtime;
106 word_send_seq = lctx->send_seq; /* XXX send_seq is 64-bit */
107 if (WRITE_BYTES(&p, end, word_send_seq)) goto out_err;
108 if (write_oid(&p, end, &krb5oid)) goto out_err;
112 * The kernel gss code expects des-cbc-raw for all flavors of des.
113 * The keytype from MIT has this type, but Heimdal does not.
114 * Force the Heimdal keytype to 4 (des-cbc-raw).
115 * Note that the rfc1964 version only supports DES enctypes.
117 if (lctx->rfc1964_kd.ctx_key.type != 4) {
118 printerr(1, "prepare_krb5_rfc1964_buffer: "
119 "overriding heimdal keytype (%d => %d)\n",
120 lctx->rfc1964_kd.ctx_key.type, 4);
121 lctx->rfc1964_kd.ctx_key.type = 4;
124 printerr(2, "prepare_krb5_rfc1964_buffer: serializing keys with "
125 "enctype %d and length %d\n",
126 lctx->rfc1964_kd.ctx_key.type,
127 lctx->rfc1964_kd.ctx_key.length);
129 /* derive the encryption key and copy it into buffer */
130 enc_key.type = lctx->rfc1964_kd.ctx_key.type;
131 enc_key.length = lctx->rfc1964_kd.ctx_key.length;
132 if ((enc_key.data = calloc(1, enc_key.length)) == NULL)
134 skd = (char *) lctx->rfc1964_kd.ctx_key.data;
135 dkd = (char *) enc_key.data;
136 for (i = 0; i < enc_key.length; i++)
137 dkd[i] = skd[i] ^ 0xf0;
138 if (write_lucid_keyblock(&p, end, &enc_key)) {
144 if (write_lucid_keyblock(&p, end, &lctx->rfc1964_kd.ctx_key))
147 buf->length = p - (char *)buf->value;
150 printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
151 if (buf->value) free(buf->value);
153 if (enc_key.data) free(enc_key.data);
158 prepare_krb5_rfc_cfx_buffer(gss_krb5_lucid_context_v1_t *lctx,
159 gss_buffer_desc *buf, int32_t *endtime)
161 printerr(0, "ERROR: prepare_krb5_rfc_cfx_buffer: not implemented\n");
167 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf, int32_t *endtime)
169 OM_uint32 maj_stat, min_stat;
170 void *return_ctx = 0;
172 gss_krb5_lucid_context_v1_t *lctx = 0;
175 printerr(2, "DEBUG: serialize_krb5_ctx: lucid version!\n");
176 maj_stat = gss_export_lucid_sec_context(&min_stat, &ctx,
178 if (maj_stat != GSS_S_COMPLETE) {
179 pgsserr("gss_export_lucid_sec_context",
180 maj_stat, min_stat, &krb5oid);
184 /* Check the version returned, we only support v1 right now */
185 vers = ((gss_krb5_lucid_context_version_t *)return_ctx)->version;
188 lctx = (gss_krb5_lucid_context_v1_t *) return_ctx;
191 printerr(0, "ERROR: unsupported lucid sec context version %d\n",
197 /* Now lctx points to a lucid context that we can send down to kernel */
198 if (lctx->protocol == 0)
199 retcode = prepare_krb5_rfc1964_buffer(lctx, buf, endtime);
201 retcode = prepare_krb5_rfc_cfx_buffer(lctx, buf, endtime);
203 maj_stat = gss_free_lucid_sec_context(&min_stat, ctx, return_ctx);
204 if (maj_stat != GSS_S_COMPLETE) {
205 pgsserr("gss_export_lucid_sec_context",
206 maj_stat, min_stat, &krb5oid);
207 printerr(0, "WARN: failed to free lucid sec context\n");
211 printerr(1, "serialize_krb5_ctx: prepare_krb5_*_buffer "
212 "failed (retcode = %d)\n", retcode);
219 printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
222 #endif /* HAVE_LUCID_CONTEXT_SUPPORT */