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
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33 #ifndef HAVE_LUCID_CONTEXT_SUPPORT
40 #include <gssapi/gssapi.h>
49 #if (KRB5_VERSION > 131)
50 /* XXX argggg, there's gotta be a better way than just duplicating this
51 * whole struct. Unfortunately, this is in a "private" header file,
52 * so this is our best choice at this point :-/
55 typedef struct _krb5_gss_ctx_id_rec {
56 unsigned int initiate : 1; /* nonzero if initiating, zero if accepting */
57 unsigned int established : 1;
58 unsigned int big_endian : 1;
59 unsigned int have_acceptor_subkey : 1;
60 unsigned int seed_init : 1; /* XXX tested but never actually set */
62 unsigned int testing_unknown_tokid : 1; /* for testing only */
65 unsigned char seed[16];
68 krb5_keyblock *subkey;
74 krb5_timestamp endtime;
76 /* XXX these used to be signed. the old spec is inspecific, and
77 the new spec specifies unsigned. I don't believe that the change
78 affects the wire encoding. */
79 uint64_t seq_send; /* gssint_uint64 */
80 uint64_t seq_recv; /* gssint_uint64 */
82 krb5_auth_context auth_context;
83 gss_OID_desc *mech_used; /* gss_OID_desc */
84 /* Protocol spec revision
85 0 => RFC 1964 with 3DES and RC4 enhancements
86 1 => draft-ietf-krb-wg-gssapi-cfx-01
87 No others defined so far. */
89 krb5_cksumtype cksumtype; /* for "main" subkey */
90 krb5_keyblock *acceptor_subkey; /* CFX only */
91 krb5_cksumtype acceptor_subkey_cksumtype;
93 gss_buffer_desc init_token;
95 } krb5_gss_ctx_id_rec, *krb5_gss_ctx_id_t;
97 #else /* KRB5_VERSION > 131 */
99 typedef struct _krb5_gss_ctx_id_rec {
103 unsigned char seed[16];
105 krb5_principal there;
106 krb5_keyblock *subkey;
112 krb5_timestamp endtime;
113 krb5_flags krb_flags;
119 krb5_auth_context auth_context;
120 gss_OID_desc *mech_used;
122 krb5_cksumtype *ctypes;
123 } krb5_gss_ctx_id_rec, *krb5_gss_ctx_id_t;
125 #endif /* KRB5_VERSION */
129 write_keyblock(char **p, char *end, struct _krb5_keyblock *arg)
133 if (WRITE_BYTES(p, end, arg->enctype)) return -1;
134 tmp.length = arg->length;
135 tmp.value = arg->contents;
136 if (write_buffer(p, end, &tmp)) return -1;
141 * XXX Hack alert! XXX Do NOT submit upstream!
142 * XXX Hack alert! XXX Do NOT submit upstream!
144 * We shouldn't be using these definitions
146 * XXX Hack alert! XXX Do NOT submit upstream!
147 * XXX Hack alert! XXX Do NOT submit upstream!
150 #define KG_USAGE_SEAL 22
151 #define KG_USAGE_SIGN 23
152 #define KG_USAGE_SEQ 24
155 #define KG_USAGE_ACCEPTOR_SEAL 22
156 #define KG_USAGE_ACCEPTOR_SIGN 23
157 #define KG_USAGE_INITIATOR_SEAL 24
158 #define KG_USAGE_INITIATOR_SIGN 25
160 /* Lifted from mit src/lib/gssapi/krb5/gssapiP_krb5.h */
162 SEAL_ALG_NONE = 0xffff,
163 SEAL_ALG_DES = 0x0000,
164 SEAL_ALG_1 = 0x0001, /* not published */
165 SEAL_ALG_MICROSOFT_RC4 = 0x0010, /* microsoft w2k; */
166 SEAL_ALG_DES3KD = 0x0002
169 #define KEY_USAGE_SEED_ENCRYPTION 0xAA
170 #define KEY_USAGE_SEED_INTEGRITY 0x55
171 #define KEY_USAGE_SEED_CHECKSUM 0x99
174 extern void krb5_enc_des3;
175 extern void krb5int_enc_des3;
176 extern void krb5int_enc_arcfour;
177 extern void krb5int_enc_aes128;
178 extern void krb5int_enc_aes256;
179 extern int krb5_derive_key();
182 * XXX Hack alert! XXX Do NOT submit upstream!
183 * XXX Hack alert! XXX Do NOT submit upstream!
185 * We should be passing down a single key to the kernel
186 * and it should be deriving the other keys. We cannot
187 * depend on any of this stuff being accessible in the
190 * XXX Hack alert! XXX Do NOT submit upstream!
191 * XXX Hack alert! XXX Do NOT submit upstream!
194 * Function to derive a new key from a given key and given constant data.
196 static krb5_error_code
197 derive_key(const krb5_keyblock *in, krb5_keyblock *out, int usage, char extra)
199 krb5_error_code code;
200 unsigned char constant_data[K5CLENGTH];
205 switch (in->enctype) {
206 #ifdef ENCTYPE_DES3_CBC_RAW
207 case ENCTYPE_DES3_CBC_RAW:
209 /* Extra hack, the structure was renamed as rc4 was added... */
210 #if defined(ENCTYPE_ARCFOUR_HMAC)
211 enc = &krb5int_enc_des3;
213 enc = &krb5_enc_des3;
217 #ifdef ENCTYPE_ARCFOUR_HMAC
218 case ENCTYPE_ARCFOUR_HMAC:
220 enc = &krb5int_enc_arcfour;
224 code = KRB5_BAD_ENCTYPE;
228 /* allocate memory for output key */
229 if ((out->contents = malloc(keylength)) == NULL) {
233 out->length = keylength;
234 out->enctype = in->enctype;
236 datain.data = (char *) constant_data;
237 datain.length = K5CLENGTH;
239 datain.data[0] = (usage>>24)&0xff;
240 datain.data[1] = (usage>>16)&0xff;
241 datain.data[2] = (usage>>8)&0xff;
242 datain.data[3] = usage&0xff;
244 datain.data[4] = (char) extra;
246 if ((code = krb5_derive_key(enc, in, out, &datain))) {
248 out->contents = NULL;
253 printerr(0, "ERROR: derive_key returning error %d (%s)\n",
254 code, error_message(code));
259 * We really shouldn't know about glue-layer context structure, but
260 * we need to get at the real krb5 context pointer. This should be
261 * removed as soon as we say there is no support for MIT Kerberos
262 * prior to 1.4 -- which gives us "legal" access to the context info.
264 typedef struct gss_union_ctx_id_t {
266 gss_ctx_id_t internal_ctx_id;
267 } gss_union_ctx_id_desc, *gss_union_ctx_id_t;
270 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf)
272 krb5_gss_ctx_id_t kctx = ((gss_union_ctx_id_t)ctx)->internal_ctx_id;
274 static int constant_zero = 0;
275 static int constant_one = 1;
276 static int constant_two = 2;
277 uint32_t word_seq_send;
278 u_int64_t seq_send_64bit;
279 uint32_t v2_flags = 0;
280 krb5_keyblock derived_key;
283 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
286 end = buf->value + MAX_CTX_LEN;
288 switch (kctx->sealalg) {
290 /* Old format of context to the kernel */
291 if (kctx->initiate) {
292 if (WRITE_BYTES(&p, end, constant_one)) goto out_err;
295 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
297 if (kctx->seed_init) {
298 if (WRITE_BYTES(&p, end, constant_one)) goto out_err;
301 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
303 if (write_bytes(&p, end, &kctx->seed, sizeof(kctx->seed)))
305 if (WRITE_BYTES(&p, end, kctx->signalg)) goto out_err;
306 if (WRITE_BYTES(&p, end, kctx->sealalg)) goto out_err;
307 if (WRITE_BYTES(&p, end, kctx->endtime)) goto out_err;
308 word_seq_send = kctx->seq_send;
309 if (WRITE_BYTES(&p, end, word_seq_send)) goto out_err;
310 if (write_oid(&p, end, kctx->mech_used)) goto out_err;
312 printerr(2, "serialize_krb5_ctx: serializing keys with "
313 "enctype %d and length %d\n",
314 kctx->enc->enctype, kctx->enc->length);
316 if (write_keyblock(&p, end, kctx->enc)) goto out_err;
317 if (write_keyblock(&p, end, kctx->seq)) goto out_err;
319 case SEAL_ALG_MICROSOFT_RC4:
320 case SEAL_ALG_DES3KD:
321 /* New format of context to the kernel */
324 * #define KRB5_CTX_FLAG_INITIATOR 0x00000001
325 * #define KRB5_CTX_FLAG_CFX 0x00000002
326 * #define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY 0x00000004
329 * u32 size_of_each_key; ( size in bytes )
330 * u32 number_of_keys; ( N (assumed to be 3 for now) )
331 * keydata-1; ( Ke (Kenc for DES3) )
332 * keydata-2; ( Ki (Kseq for DES3) )
333 * keydata-3; ( Kc (derived checksum key) )
335 if (WRITE_BYTES(&p, end, constant_two)) goto out_err;
336 if (WRITE_BYTES(&p, end, kctx->endtime)) goto out_err;
338 /* Only applicable flag for this is initiator */
339 if (kctx->initiate) v2_flags |= KRB5_CTX_FLAG_INITIATOR;
340 if (WRITE_BYTES(&p, end, v2_flags)) goto out_err;
342 seq_send_64bit = kctx->seq_send;
343 if (WRITE_BYTES(&p, end, seq_send_64bit)) goto out_err;
345 if (WRITE_BYTES(&p, end, kctx->enc->enctype)) goto out_err;
346 if (WRITE_BYTES(&p, end, kctx->enc->length)) goto out_err;
348 if (WRITE_BYTES(&p, end, numkeys)) goto out_err;
349 printerr(2, "serialize_krb5_ctx: serializing %d keys with "
350 "enctype %d and size %d\n",
351 numkeys, kctx->enc->enctype, kctx->enc->length);
354 if (write_bytes(&p, end, kctx->enc->contents,
359 if (write_bytes(&p, end, kctx->enc->contents,
364 if (derive_key(kctx->seq, &derived_key,
365 KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM))
367 if (write_bytes(&p, end, derived_key.contents,
370 free(derived_key.contents);
373 printerr(0, "ERROR: serialize_krb5_ctx: unsupported seal "
374 "algorithm %d\n", kctx->sealalg);
378 buf->length = p - (char *)buf->value;
382 printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
391 #endif /* HAVE_KRB5 */
392 #endif /* HAVE_LUCID_CONTEXT_SUPPORT */