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Linux/include/linux/sunrpc/gss_krb5.h

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  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 <linux/crypto.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_blkcipher *tfm,
 75                         void *iv, void *in, void *out,
 76                         int length);            /* encryption function */
 77         u32 (*decrypt) (struct crypto_blkcipher *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, int ec,
 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_blkcipher *enc;
102         struct crypto_blkcipher *seq;
103         struct crypto_blkcipher *acceptor_enc;
104         struct crypto_blkcipher *initiator_enc;
105         struct crypto_blkcipher *acceptor_enc_aux;
106         struct crypto_blkcipher *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 spinlock_t krb5_seq_lock;
122 
123 /* The length of the Kerberos GSS token header */
124 #define GSS_KRB5_TOK_HDR_LEN    (16)
125 
126 #define KG_TOK_MIC_MSG    0x0101
127 #define KG_TOK_WRAP_MSG   0x0201
128 
129 #define KG2_TOK_INITIAL     0x0101
130 #define KG2_TOK_RESPONSE    0x0202
131 #define KG2_TOK_MIC         0x0404
132 #define KG2_TOK_WRAP        0x0504
133 
134 #define KG2_TOKEN_FLAG_SENTBYACCEPTOR   0x01
135 #define KG2_TOKEN_FLAG_SEALED           0x02
136 #define KG2_TOKEN_FLAG_ACCEPTORSUBKEY   0x04
137 
138 #define KG2_RESP_FLAG_ERROR             0x0001
139 #define KG2_RESP_FLAG_DELEG_OK          0x0002
140 
141 enum sgn_alg {
142         SGN_ALG_DES_MAC_MD5 = 0x0000,
143         SGN_ALG_MD2_5 = 0x0001,
144         SGN_ALG_DES_MAC = 0x0002,
145         SGN_ALG_3 = 0x0003,             /* not published */
146         SGN_ALG_HMAC_MD5 = 0x0011,      /* microsoft w2k; no support */
147         SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004
148 };
149 enum seal_alg {
150         SEAL_ALG_NONE = 0xffff,
151         SEAL_ALG_DES = 0x0000,
152         SEAL_ALG_1 = 0x0001,            /* not published */
153         SEAL_ALG_MICROSOFT_RC4 = 0x0010,/* microsoft w2k; no support */
154         SEAL_ALG_DES3KD = 0x0002
155 };
156 
157 #define CKSUMTYPE_CRC32                 0x0001
158 #define CKSUMTYPE_RSA_MD4               0x0002
159 #define CKSUMTYPE_RSA_MD4_DES           0x0003
160 #define CKSUMTYPE_DESCBC                0x0004
161 #define CKSUMTYPE_RSA_MD5               0x0007
162 #define CKSUMTYPE_RSA_MD5_DES           0x0008
163 #define CKSUMTYPE_NIST_SHA              0x0009
164 #define CKSUMTYPE_HMAC_SHA1_DES3        0x000c
165 #define CKSUMTYPE_HMAC_SHA1_96_AES128   0x000f
166 #define CKSUMTYPE_HMAC_SHA1_96_AES256   0x0010
167 #define CKSUMTYPE_HMAC_MD5_ARCFOUR      -138 /* Microsoft md5 hmac cksumtype */
168 
169 /* from gssapi_err_krb5.h */
170 #define KG_CCACHE_NOMATCH                        (39756032L)
171 #define KG_KEYTAB_NOMATCH                        (39756033L)
172 #define KG_TGT_MISSING                           (39756034L)
173 #define KG_NO_SUBKEY                             (39756035L)
174 #define KG_CONTEXT_ESTABLISHED                   (39756036L)
175 #define KG_BAD_SIGN_TYPE                         (39756037L)
176 #define KG_BAD_LENGTH                            (39756038L)
177 #define KG_CTX_INCOMPLETE                        (39756039L)
178 #define KG_CONTEXT                               (39756040L)
179 #define KG_CRED                                  (39756041L)
180 #define KG_ENC_DESC                              (39756042L)
181 #define KG_BAD_SEQ                               (39756043L)
182 #define KG_EMPTY_CCACHE                          (39756044L)
183 #define KG_NO_CTYPES                             (39756045L)
184 
185 /* per Kerberos v5 protocol spec crypto types from the wire. 
186  * these get mapped to linux kernel crypto routines.  
187  */
188 #define ENCTYPE_NULL            0x0000
189 #define ENCTYPE_DES_CBC_CRC     0x0001  /* DES cbc mode with CRC-32 */
190 #define ENCTYPE_DES_CBC_MD4     0x0002  /* DES cbc mode with RSA-MD4 */
191 #define ENCTYPE_DES_CBC_MD5     0x0003  /* DES cbc mode with RSA-MD5 */
192 #define ENCTYPE_DES_CBC_RAW     0x0004  /* DES cbc mode raw */
193 /* XXX deprecated? */
194 #define ENCTYPE_DES3_CBC_SHA    0x0005  /* DES-3 cbc mode with NIST-SHA */
195 #define ENCTYPE_DES3_CBC_RAW    0x0006  /* DES-3 cbc mode raw */
196 #define ENCTYPE_DES_HMAC_SHA1   0x0008
197 #define ENCTYPE_DES3_CBC_SHA1   0x0010
198 #define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011
199 #define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012
200 #define ENCTYPE_ARCFOUR_HMAC            0x0017
201 #define ENCTYPE_ARCFOUR_HMAC_EXP        0x0018
202 #define ENCTYPE_UNKNOWN         0x01ff
203 
204 /*
205  * Constants used for key derivation
206  */
207 /* for 3DES */
208 #define KG_USAGE_SEAL (22)
209 #define KG_USAGE_SIGN (23)
210 #define KG_USAGE_SEQ  (24)
211 
212 /* from rfc3961 */
213 #define KEY_USAGE_SEED_CHECKSUM         (0x99)
214 #define KEY_USAGE_SEED_ENCRYPTION       (0xAA)
215 #define KEY_USAGE_SEED_INTEGRITY        (0x55)
216 
217 /* from rfc4121 */
218 #define KG_USAGE_ACCEPTOR_SEAL  (22)
219 #define KG_USAGE_ACCEPTOR_SIGN  (23)
220 #define KG_USAGE_INITIATOR_SEAL (24)
221 #define KG_USAGE_INITIATOR_SIGN (25)
222 
223 /*
224  * This compile-time check verifies that we will not exceed the
225  * slack space allotted by the client and server auth_gss code
226  * before they call gss_wrap().
227  */
228 #define GSS_KRB5_MAX_SLACK_NEEDED \
229         (GSS_KRB5_TOK_HDR_LEN     /* gss token header */         \
230         + GSS_KRB5_MAX_CKSUM_LEN  /* gss token checksum */       \
231         + GSS_KRB5_MAX_BLOCKSIZE  /* confounder */               \
232         + GSS_KRB5_MAX_BLOCKSIZE  /* possible padding */         \
233         + GSS_KRB5_TOK_HDR_LEN    /* encrypted hdr in v2 token */\
234         + GSS_KRB5_MAX_CKSUM_LEN  /* encryption hmac */          \
235         + 4 + 4                   /* RPC verifier */             \
236         + GSS_KRB5_TOK_HDR_LEN                                   \
237         + GSS_KRB5_MAX_CKSUM_LEN)
238 
239 u32
240 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
241                 struct xdr_buf *body, int body_offset, u8 *cksumkey,
242                 unsigned int usage, struct xdr_netobj *cksumout);
243 
244 u32
245 make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
246                  struct xdr_buf *body, int body_offset, u8 *key,
247                  unsigned int usage, struct xdr_netobj *cksum);
248 
249 u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
250                 struct xdr_netobj *);
251 
252 u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
253                 struct xdr_netobj *);
254 
255 u32
256 gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset,
257                 struct xdr_buf *outbuf, struct page **pages);
258 
259 u32
260 gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset,
261                 struct xdr_buf *buf);
262 
263 
264 u32
265 krb5_encrypt(struct crypto_blkcipher *key,
266              void *iv, void *in, void *out, int length);
267 
268 u32
269 krb5_decrypt(struct crypto_blkcipher *key,
270              void *iv, void *in, void *out, int length); 
271 
272 int
273 gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *outbuf,
274                     int offset, struct page **pages);
275 
276 int
277 gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *inbuf,
278                     int offset);
279 
280 s32
281 krb5_make_seq_num(struct krb5_ctx *kctx,
282                 struct crypto_blkcipher *key,
283                 int direction,
284                 u32 seqnum, unsigned char *cksum, unsigned char *buf);
285 
286 s32
287 krb5_get_seq_num(struct krb5_ctx *kctx,
288                unsigned char *cksum,
289                unsigned char *buf, int *direction, u32 *seqnum);
290 
291 int
292 xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen);
293 
294 u32
295 krb5_derive_key(const struct gss_krb5_enctype *gk5e,
296                 const struct xdr_netobj *inkey,
297                 struct xdr_netobj *outkey,
298                 const struct xdr_netobj *in_constant,
299                 gfp_t gfp_mask);
300 
301 u32
302 gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
303                        struct xdr_netobj *randombits,
304                        struct xdr_netobj *key);
305 
306 u32
307 gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
308                       struct xdr_netobj *randombits,
309                       struct xdr_netobj *key);
310 
311 u32
312 gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
313                      struct xdr_buf *buf, int ec,
314                      struct page **pages);
315 
316 u32
317 gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset,
318                      struct xdr_buf *buf, u32 *plainoffset,
319                      u32 *plainlen);
320 
321 int
322 krb5_rc4_setup_seq_key(struct krb5_ctx *kctx,
323                        struct crypto_blkcipher *cipher,
324                        unsigned char *cksum);
325 
326 int
327 krb5_rc4_setup_enc_key(struct krb5_ctx *kctx,
328                        struct crypto_blkcipher *cipher,
329                        s32 seqnum);
330 void
331 gss_krb5_make_confounder(char *p, u32 conflen);
332 

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