Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[sfrench/cifs-2.6.git] / include / linux / sunrpc / gss_krb5.h
1 /*
2  *  linux/include/linux/sunrpc/gss_krb5_types.h
3  *
4  *  Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
5  *  lib/gssapi/krb5/gssapiP_krb5.h, and others
6  *
7  *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
8  *  All rights reserved.
9  *
10  *  Andy Adamson   <andros@umich.edu>
11  *  Bruce Fields   <bfields@umich.edu>
12  */
13
14 /*
15  * Copyright 1995 by the Massachusetts Institute of Technology.
16  * All Rights Reserved.
17  *
18  * Export of this software from the United States of America may
19  *   require a specific license from the United States Government.
20  *   It is the responsibility of any person or organization contemplating
21  *   export to obtain such a license before exporting.
22  *
23  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
24  * distribute this software and its documentation for any purpose and
25  * without fee is hereby granted, provided that the above copyright
26  * notice appear in all copies and that both that copyright notice and
27  * this permission notice appear in supporting documentation, and that
28  * the name of M.I.T. not be used in advertising or publicity pertaining
29  * to distribution of the software without specific, written prior
30  * permission.  Furthermore if you modify this software you must label
31  * your software as modified software and not distribute it in such a
32  * fashion that it might be confused with the original M.I.T. software.
33  * M.I.T. makes no representations about the suitability of
34  * this software for any purpose.  It is provided "as is" without express
35  * or implied warranty.
36  *
37  */
38
39 #include <crypto/skcipher.h>
40 #include <linux/sunrpc/auth_gss.h>
41 #include <linux/sunrpc/gss_err.h>
42 #include <linux/sunrpc/gss_asn1.h>
43
44 /* Length of constant used in key derivation */
45 #define GSS_KRB5_K5CLENGTH (5)
46
47 /* Maximum key length (in bytes) for the supported crypto algorithms*/
48 #define GSS_KRB5_MAX_KEYLEN (32)
49
50 /* Maximum checksum function output for the supported crypto algorithms */
51 #define GSS_KRB5_MAX_CKSUM_LEN  (20)
52
53 /* Maximum blocksize for the supported crypto algorithms */
54 #define GSS_KRB5_MAX_BLOCKSIZE  (16)
55
56 struct krb5_ctx;
57
58 struct gss_krb5_enctype {
59         const u32               etype;          /* encryption (key) type */
60         const u32               ctype;          /* checksum type */
61         const char              *name;          /* "friendly" name */
62         const char              *encrypt_name;  /* crypto encrypt name */
63         const char              *cksum_name;    /* crypto checksum name */
64         const u16               signalg;        /* signing algorithm */
65         const u16               sealalg;        /* sealing algorithm */
66         const u32               blocksize;      /* encryption blocksize */
67         const u32               conflen;        /* confounder length
68                                                    (normally the same as
69                                                    the blocksize) */
70         const u32               cksumlength;    /* checksum length */
71         const u32               keyed_cksum;    /* is it a keyed cksum? */
72         const u32               keybytes;       /* raw key len, in bytes */
73         const u32               keylength;      /* final key len, in bytes */
74         u32 (*encrypt) (struct crypto_sync_skcipher *tfm,
75                         void *iv, void *in, void *out,
76                         int length);            /* encryption function */
77         u32 (*decrypt) (struct crypto_sync_skcipher *tfm,
78                         void *iv, void *in, void *out,
79                         int length);            /* decryption function */
80         u32 (*mk_key) (const struct gss_krb5_enctype *gk5e,
81                        struct xdr_netobj *in,
82                        struct xdr_netobj *out); /* complete key generation */
83         u32 (*encrypt_v2) (struct krb5_ctx *kctx, u32 offset,
84                            struct xdr_buf *buf,
85                            struct page **pages); /* v2 encryption function */
86         u32 (*decrypt_v2) (struct krb5_ctx *kctx, u32 offset,
87                            struct xdr_buf *buf, u32 *headskip,
88                            u32 *tailskip);      /* v2 decryption function */
89 };
90
91 /* krb5_ctx flags definitions */
92 #define KRB5_CTX_FLAG_INITIATOR         0x00000001
93 #define KRB5_CTX_FLAG_CFX               0x00000002
94 #define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY   0x00000004
95
96 struct krb5_ctx {
97         int                     initiate; /* 1 = initiating, 0 = accepting */
98         u32                     enctype;
99         u32                     flags;
100         const struct gss_krb5_enctype *gk5e; /* enctype-specific info */
101         struct crypto_sync_skcipher *enc;
102         struct crypto_sync_skcipher *seq;
103         struct crypto_sync_skcipher *acceptor_enc;
104         struct crypto_sync_skcipher *initiator_enc;
105         struct crypto_sync_skcipher *acceptor_enc_aux;
106         struct crypto_sync_skcipher *initiator_enc_aux;
107         u8                      Ksess[GSS_KRB5_MAX_KEYLEN]; /* session key */
108         u8                      cksum[GSS_KRB5_MAX_KEYLEN];
109         s32                     endtime;
110         u32                     seq_send;
111         u64                     seq_send64;
112         struct xdr_netobj       mech_used;
113         u8                      initiator_sign[GSS_KRB5_MAX_KEYLEN];
114         u8                      acceptor_sign[GSS_KRB5_MAX_KEYLEN];
115         u8                      initiator_seal[GSS_KRB5_MAX_KEYLEN];
116         u8                      acceptor_seal[GSS_KRB5_MAX_KEYLEN];
117         u8                      initiator_integ[GSS_KRB5_MAX_KEYLEN];
118         u8                      acceptor_integ[GSS_KRB5_MAX_KEYLEN];
119 };
120
121 extern u32 gss_seq_send_fetch_and_inc(struct krb5_ctx *ctx);
122 extern u64 gss_seq_send64_fetch_and_inc(struct krb5_ctx *ctx);
123
124 /* The length of the Kerberos GSS token header */
125 #define GSS_KRB5_TOK_HDR_LEN    (16)
126
127 #define KG_TOK_MIC_MSG    0x0101
128 #define KG_TOK_WRAP_MSG   0x0201
129
130 #define KG2_TOK_INITIAL     0x0101
131 #define KG2_TOK_RESPONSE    0x0202
132 #define KG2_TOK_MIC         0x0404
133 #define KG2_TOK_WRAP        0x0504
134
135 #define KG2_TOKEN_FLAG_SENTBYACCEPTOR   0x01
136 #define KG2_TOKEN_FLAG_SEALED           0x02
137 #define KG2_TOKEN_FLAG_ACCEPTORSUBKEY   0x04
138
139 #define KG2_RESP_FLAG_ERROR             0x0001
140 #define KG2_RESP_FLAG_DELEG_OK          0x0002
141
142 enum sgn_alg {
143         SGN_ALG_DES_MAC_MD5 = 0x0000,
144         SGN_ALG_MD2_5 = 0x0001,
145         SGN_ALG_DES_MAC = 0x0002,
146         SGN_ALG_3 = 0x0003,             /* not published */
147         SGN_ALG_HMAC_MD5 = 0x0011,      /* microsoft w2k; no support */
148         SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004
149 };
150 enum seal_alg {
151         SEAL_ALG_NONE = 0xffff,
152         SEAL_ALG_DES = 0x0000,
153         SEAL_ALG_1 = 0x0001,            /* not published */
154         SEAL_ALG_MICROSOFT_RC4 = 0x0010,/* microsoft w2k; no support */
155         SEAL_ALG_DES3KD = 0x0002
156 };
157
158 #define CKSUMTYPE_CRC32                 0x0001
159 #define CKSUMTYPE_RSA_MD4               0x0002
160 #define CKSUMTYPE_RSA_MD4_DES           0x0003
161 #define CKSUMTYPE_DESCBC                0x0004
162 #define CKSUMTYPE_RSA_MD5               0x0007
163 #define CKSUMTYPE_RSA_MD5_DES           0x0008
164 #define CKSUMTYPE_NIST_SHA              0x0009
165 #define CKSUMTYPE_HMAC_SHA1_DES3        0x000c
166 #define CKSUMTYPE_HMAC_SHA1_96_AES128   0x000f
167 #define CKSUMTYPE_HMAC_SHA1_96_AES256   0x0010
168 #define CKSUMTYPE_HMAC_MD5_ARCFOUR      -138 /* Microsoft md5 hmac cksumtype */
169
170 /* from gssapi_err_krb5.h */
171 #define KG_CCACHE_NOMATCH                        (39756032L)
172 #define KG_KEYTAB_NOMATCH                        (39756033L)
173 #define KG_TGT_MISSING                           (39756034L)
174 #define KG_NO_SUBKEY                             (39756035L)
175 #define KG_CONTEXT_ESTABLISHED                   (39756036L)
176 #define KG_BAD_SIGN_TYPE                         (39756037L)
177 #define KG_BAD_LENGTH                            (39756038L)
178 #define KG_CTX_INCOMPLETE                        (39756039L)
179 #define KG_CONTEXT                               (39756040L)
180 #define KG_CRED                                  (39756041L)
181 #define KG_ENC_DESC                              (39756042L)
182 #define KG_BAD_SEQ                               (39756043L)
183 #define KG_EMPTY_CCACHE                          (39756044L)
184 #define KG_NO_CTYPES                             (39756045L)
185
186 /* per Kerberos v5 protocol spec crypto types from the wire. 
187  * these get mapped to linux kernel crypto routines.  
188  */
189 #define ENCTYPE_NULL            0x0000
190 #define ENCTYPE_DES_CBC_CRC     0x0001  /* DES cbc mode with CRC-32 */
191 #define ENCTYPE_DES_CBC_MD4     0x0002  /* DES cbc mode with RSA-MD4 */
192 #define ENCTYPE_DES_CBC_MD5     0x0003  /* DES cbc mode with RSA-MD5 */
193 #define ENCTYPE_DES_CBC_RAW     0x0004  /* DES cbc mode raw */
194 /* XXX deprecated? */
195 #define ENCTYPE_DES3_CBC_SHA    0x0005  /* DES-3 cbc mode with NIST-SHA */
196 #define ENCTYPE_DES3_CBC_RAW    0x0006  /* DES-3 cbc mode raw */
197 #define ENCTYPE_DES_HMAC_SHA1   0x0008
198 #define ENCTYPE_DES3_CBC_SHA1   0x0010
199 #define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011
200 #define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012
201 #define ENCTYPE_ARCFOUR_HMAC            0x0017
202 #define ENCTYPE_ARCFOUR_HMAC_EXP        0x0018
203 #define ENCTYPE_UNKNOWN         0x01ff
204
205 /*
206  * Constants used for key derivation
207  */
208 /* for 3DES */
209 #define KG_USAGE_SEAL (22)
210 #define KG_USAGE_SIGN (23)
211 #define KG_USAGE_SEQ  (24)
212
213 /* from rfc3961 */
214 #define KEY_USAGE_SEED_CHECKSUM         (0x99)
215 #define KEY_USAGE_SEED_ENCRYPTION       (0xAA)
216 #define KEY_USAGE_SEED_INTEGRITY        (0x55)
217
218 /* from rfc4121 */
219 #define KG_USAGE_ACCEPTOR_SEAL  (22)
220 #define KG_USAGE_ACCEPTOR_SIGN  (23)
221 #define KG_USAGE_INITIATOR_SEAL (24)
222 #define KG_USAGE_INITIATOR_SIGN (25)
223
224 /*
225  * This compile-time check verifies that we will not exceed the
226  * slack space allotted by the client and server auth_gss code
227  * before they call gss_wrap().
228  */
229 #define GSS_KRB5_MAX_SLACK_NEEDED \
230         (GSS_KRB5_TOK_HDR_LEN     /* gss token header */         \
231         + GSS_KRB5_MAX_CKSUM_LEN  /* gss token checksum */       \
232         + GSS_KRB5_MAX_BLOCKSIZE  /* confounder */               \
233         + GSS_KRB5_MAX_BLOCKSIZE  /* possible padding */         \
234         + GSS_KRB5_TOK_HDR_LEN    /* encrypted hdr in v2 token */\
235         + GSS_KRB5_MAX_CKSUM_LEN  /* encryption hmac */          \
236         + 4 + 4                   /* RPC verifier */             \
237         + GSS_KRB5_TOK_HDR_LEN                                   \
238         + GSS_KRB5_MAX_CKSUM_LEN)
239
240 u32
241 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
242                 struct xdr_buf *body, int body_offset, u8 *cksumkey,
243                 unsigned int usage, struct xdr_netobj *cksumout);
244
245 u32
246 make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
247                  struct xdr_buf *body, int body_offset, u8 *key,
248                  unsigned int usage, struct xdr_netobj *cksum);
249
250 u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
251                 struct xdr_netobj *);
252
253 u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
254                 struct xdr_netobj *);
255
256 u32
257 gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset,
258                 struct xdr_buf *outbuf, struct page **pages);
259
260 u32
261 gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset,
262                 struct xdr_buf *buf);
263
264
265 u32
266 krb5_encrypt(struct crypto_sync_skcipher *key,
267              void *iv, void *in, void *out, int length);
268
269 u32
270 krb5_decrypt(struct crypto_sync_skcipher *key,
271              void *iv, void *in, void *out, int length); 
272
273 int
274 gss_encrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *outbuf,
275                     int offset, struct page **pages);
276
277 int
278 gss_decrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *inbuf,
279                     int offset);
280
281 s32
282 krb5_make_seq_num(struct krb5_ctx *kctx,
283                 struct crypto_sync_skcipher *key,
284                 int direction,
285                 u32 seqnum, unsigned char *cksum, unsigned char *buf);
286
287 s32
288 krb5_get_seq_num(struct krb5_ctx *kctx,
289                unsigned char *cksum,
290                unsigned char *buf, int *direction, u32 *seqnum);
291
292 int
293 xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen);
294
295 u32
296 krb5_derive_key(const struct gss_krb5_enctype *gk5e,
297                 const struct xdr_netobj *inkey,
298                 struct xdr_netobj *outkey,
299                 const struct xdr_netobj *in_constant,
300                 gfp_t gfp_mask);
301
302 u32
303 gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
304                        struct xdr_netobj *randombits,
305                        struct xdr_netobj *key);
306
307 u32
308 gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
309                       struct xdr_netobj *randombits,
310                       struct xdr_netobj *key);
311
312 u32
313 gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
314                      struct xdr_buf *buf,
315                      struct page **pages);
316
317 u32
318 gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset,
319                      struct xdr_buf *buf, u32 *plainoffset,
320                      u32 *plainlen);
321
322 int
323 krb5_rc4_setup_seq_key(struct krb5_ctx *kctx,
324                        struct crypto_sync_skcipher *cipher,
325                        unsigned char *cksum);
326
327 int
328 krb5_rc4_setup_enc_key(struct krb5_ctx *kctx,
329                        struct crypto_sync_skcipher *cipher,
330                        s32 seqnum);
331 void
332 gss_krb5_make_confounder(char *p, u32 conflen);