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, u32 len, 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 atomic_t seq_send; 110 atomic64_t seq_send64; 111 time64_t endtime; 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 /* The length of the Kerberos GSS token header */ 122 #define GSS_KRB5_TOK_HDR_LEN (16) 123 124 #define KG_TOK_MIC_MSG 0x0101 125 #define KG_TOK_WRAP_MSG 0x0201 126 127 #define KG2_TOK_INITIAL 0x0101 128 #define KG2_TOK_RESPONSE 0x0202 129 #define KG2_TOK_MIC 0x0404 130 #define KG2_TOK_WRAP 0x0504 131 132 #define KG2_TOKEN_FLAG_SENTBYACCEPTOR 0x01 133 #define KG2_TOKEN_FLAG_SEALED 0x02 134 #define KG2_TOKEN_FLAG_ACCEPTORSUBKEY 0x04 135 136 #define KG2_RESP_FLAG_ERROR 0x0001 137 #define KG2_RESP_FLAG_DELEG_OK 0x0002 138 139 enum sgn_alg { 140 SGN_ALG_DES_MAC_MD5 = 0x0000, 141 SGN_ALG_MD2_5 = 0x0001, 142 SGN_ALG_DES_MAC = 0x0002, 143 SGN_ALG_3 = 0x0003, /* not published */ 144 SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004 145 }; 146 enum seal_alg { 147 SEAL_ALG_NONE = 0xffff, 148 SEAL_ALG_DES = 0x0000, 149 SEAL_ALG_1 = 0x0001, /* not published */ 150 SEAL_ALG_DES3KD = 0x0002 151 }; 152 153 #define CKSUMTYPE_CRC32 0x0001 154 #define CKSUMTYPE_RSA_MD4 0x0002 155 #define CKSUMTYPE_RSA_MD4_DES 0x0003 156 #define CKSUMTYPE_DESCBC 0x0004 157 #define CKSUMTYPE_RSA_MD5 0x0007 158 #define CKSUMTYPE_RSA_MD5_DES 0x0008 159 #define CKSUMTYPE_NIST_SHA 0x0009 160 #define CKSUMTYPE_HMAC_SHA1_DES3 0x000c 161 #define CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f 162 #define CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010 163 #define CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /* Microsoft md5 hmac cksumtype */ 164 165 /* from gssapi_err_krb5.h */ 166 #define KG_CCACHE_NOMATCH (39756032L) 167 #define KG_KEYTAB_NOMATCH (39756033L) 168 #define KG_TGT_MISSING (39756034L) 169 #define KG_NO_SUBKEY (39756035L) 170 #define KG_CONTEXT_ESTABLISHED (39756036L) 171 #define KG_BAD_SIGN_TYPE (39756037L) 172 #define KG_BAD_LENGTH (39756038L) 173 #define KG_CTX_INCOMPLETE (39756039L) 174 #define KG_CONTEXT (39756040L) 175 #define KG_CRED (39756041L) 176 #define KG_ENC_DESC (39756042L) 177 #define KG_BAD_SEQ (39756043L) 178 #define KG_EMPTY_CCACHE (39756044L) 179 #define KG_NO_CTYPES (39756045L) 180 181 /* per Kerberos v5 protocol spec crypto types from the wire. 182 * these get mapped to linux kernel crypto routines. 183 */ 184 #define ENCTYPE_NULL 0x0000 185 #define ENCTYPE_DES_CBC_CRC 0x0001 /* DES cbc mode with CRC-32 */ 186 #define ENCTYPE_DES_CBC_MD4 0x0002 /* DES cbc mode with RSA-MD4 */ 187 #define ENCTYPE_DES_CBC_MD5 0x0003 /* DES cbc mode with RSA-MD5 */ 188 #define ENCTYPE_DES_CBC_RAW 0x0004 /* DES cbc mode raw */ 189 /* XXX deprecated? */ 190 #define ENCTYPE_DES3_CBC_SHA 0x0005 /* DES-3 cbc mode with NIST-SHA */ 191 #define ENCTYPE_DES3_CBC_RAW 0x0006 /* DES-3 cbc mode raw */ 192 #define ENCTYPE_DES_HMAC_SHA1 0x0008 193 #define ENCTYPE_DES3_CBC_SHA1 0x0010 194 #define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011 195 #define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012 196 #define ENCTYPE_ARCFOUR_HMAC 0x0017 197 #define ENCTYPE_ARCFOUR_HMAC_EXP 0x0018 198 #define ENCTYPE_UNKNOWN 0x01ff 199 200 /* 201 * Constants used for key derivation 202 */ 203 /* for 3DES */ 204 #define KG_USAGE_SEAL (22) 205 #define KG_USAGE_SIGN (23) 206 #define KG_USAGE_SEQ (24) 207 208 /* from rfc3961 */ 209 #define KEY_USAGE_SEED_CHECKSUM (0x99) 210 #define KEY_USAGE_SEED_ENCRYPTION (0xAA) 211 #define KEY_USAGE_SEED_INTEGRITY (0x55) 212 213 /* from rfc4121 */ 214 #define KG_USAGE_ACCEPTOR_SEAL (22) 215 #define KG_USAGE_ACCEPTOR_SIGN (23) 216 #define KG_USAGE_INITIATOR_SEAL (24) 217 #define KG_USAGE_INITIATOR_SIGN (25) 218 219 /* 220 * This compile-time check verifies that we will not exceed the 221 * slack space allotted by the client and server auth_gss code 222 * before they call gss_wrap(). 223 */ 224 #define GSS_KRB5_MAX_SLACK_NEEDED \ 225 (GSS_KRB5_TOK_HDR_LEN /* gss token header */ \ 226 + GSS_KRB5_MAX_CKSUM_LEN /* gss token checksum */ \ 227 + GSS_KRB5_MAX_BLOCKSIZE /* confounder */ \ 228 + GSS_KRB5_MAX_BLOCKSIZE /* possible padding */ \ 229 + GSS_KRB5_TOK_HDR_LEN /* encrypted hdr in v2 token */\ 230 + GSS_KRB5_MAX_CKSUM_LEN /* encryption hmac */ \ 231 + 4 + 4 /* RPC verifier */ \ 232 + GSS_KRB5_TOK_HDR_LEN \ 233 + GSS_KRB5_MAX_CKSUM_LEN) 234 235 u32 236 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen, 237 struct xdr_buf *body, int body_offset, u8 *cksumkey, 238 unsigned int usage, struct xdr_netobj *cksumout); 239 240 u32 241 make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen, 242 struct xdr_buf *body, int body_offset, u8 *key, 243 unsigned int usage, struct xdr_netobj *cksum); 244 245 u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *, 246 struct xdr_netobj *); 247 248 u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *, 249 struct xdr_netobj *); 250 251 u32 252 gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset, 253 struct xdr_buf *outbuf, struct page **pages); 254 255 u32 256 gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset, int len, 257 struct xdr_buf *buf); 258 259 260 u32 261 krb5_encrypt(struct crypto_sync_skcipher *key, 262 void *iv, void *in, void *out, int length); 263 264 u32 265 krb5_decrypt(struct crypto_sync_skcipher *key, 266 void *iv, void *in, void *out, int length); 267 268 int 269 gss_encrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *outbuf, 270 int offset, struct page **pages); 271 272 int 273 gss_decrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *inbuf, 274 int offset); 275 276 s32 277 krb5_make_seq_num(struct krb5_ctx *kctx, 278 struct crypto_sync_skcipher *key, 279 int direction, 280 u32 seqnum, unsigned char *cksum, unsigned char *buf); 281 282 s32 283 krb5_get_seq_num(struct krb5_ctx *kctx, 284 unsigned char *cksum, 285 unsigned char *buf, int *direction, u32 *seqnum); 286 287 int 288 xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen); 289 290 u32 291 krb5_derive_key(const struct gss_krb5_enctype *gk5e, 292 const struct xdr_netobj *inkey, 293 struct xdr_netobj *outkey, 294 const struct xdr_netobj *in_constant, 295 gfp_t gfp_mask); 296 297 u32 298 gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e, 299 struct xdr_netobj *randombits, 300 struct xdr_netobj *key); 301 302 u32 303 gss_krb5_aes_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_encrypt(struct krb5_ctx *kctx, u32 offset, 309 struct xdr_buf *buf, 310 struct page **pages); 311 312 u32 313 gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, u32 len, 314 struct xdr_buf *buf, u32 *plainoffset, 315 u32 *plainlen); 316 317 void 318 gss_krb5_make_confounder(char *p, u32 conflen); 319