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 56struct krb5_ctx; 57 58struct 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 96struct 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 121extern 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 141enum 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}; 149enum 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#define ENCTYPE_DES3_CBC_SHA 0x0005 /* DES-3 cbc mode with NIST-SHA */ 194#define ENCTYPE_DES3_CBC_RAW 0x0006 /* DES-3 cbc mode raw */ 195#define ENCTYPE_DES_HMAC_SHA1 0x0008 196#define ENCTYPE_DES3_CBC_SHA1 0x0010 197#define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011 198#define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012 199#define ENCTYPE_ARCFOUR_HMAC 0x0017 200#define ENCTYPE_ARCFOUR_HMAC_EXP 0x0018 201#define ENCTYPE_UNKNOWN 0x01ff 202 203/* 204 * Constants used for key derivation 205 */ 206/* for 3DES */ 207#define KG_USAGE_SEAL (22) 208#define KG_USAGE_SIGN (23) 209#define KG_USAGE_SEQ (24) 210 211/* from rfc3961 */ 212#define KEY_USAGE_SEED_CHECKSUM (0x99) 213#define KEY_USAGE_SEED_ENCRYPTION (0xAA) 214#define KEY_USAGE_SEED_INTEGRITY (0x55) 215 216/* from rfc4121 */ 217#define KG_USAGE_ACCEPTOR_SEAL (22) 218#define KG_USAGE_ACCEPTOR_SIGN (23) 219#define KG_USAGE_INITIATOR_SEAL (24) 220#define KG_USAGE_INITIATOR_SIGN (25) 221 222/* 223 * This compile-time check verifies that we will not exceed the 224 * slack space allotted by the client and server auth_gss code 225 * before they call gss_wrap(). 226 */ 227#define GSS_KRB5_MAX_SLACK_NEEDED \ 228 (GSS_KRB5_TOK_HDR_LEN /* gss token header */ \ 229 + GSS_KRB5_MAX_CKSUM_LEN /* gss token checksum */ \ 230 + GSS_KRB5_MAX_BLOCKSIZE /* confounder */ \ 231 + GSS_KRB5_MAX_BLOCKSIZE /* possible padding */ \ 232 + GSS_KRB5_TOK_HDR_LEN /* encrypted hdr in v2 token */\ 233 + GSS_KRB5_MAX_CKSUM_LEN /* encryption hmac */ \ 234 + 4 + 4 /* RPC verifier */ \ 235 + GSS_KRB5_TOK_HDR_LEN \ 236 + GSS_KRB5_MAX_CKSUM_LEN) 237 238u32 239make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen, 240 struct xdr_buf *body, int body_offset, u8 *cksumkey, 241 unsigned int usage, struct xdr_netobj *cksumout); 242 243u32 244make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen, 245 struct xdr_buf *body, int body_offset, u8 *key, 246 unsigned int usage, struct xdr_netobj *cksum); 247 248u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *, 249 struct xdr_netobj *); 250 251u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *, 252 struct xdr_netobj *); 253 254u32 255gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset, 256 struct xdr_buf *outbuf, struct page **pages); 257 258u32 259gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset, 260 struct xdr_buf *buf); 261 262 263u32 264krb5_encrypt(struct crypto_blkcipher *key, 265 void *iv, void *in, void *out, int length); 266 267u32 268krb5_decrypt(struct crypto_blkcipher *key, 269 void *iv, void *in, void *out, int length); 270 271int 272gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *outbuf, 273 int offset, struct page **pages); 274 275int 276gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *inbuf, 277 int offset); 278 279s32 280krb5_make_seq_num(struct krb5_ctx *kctx, 281 struct crypto_blkcipher *key, 282 int direction, 283 u32 seqnum, unsigned char *cksum, unsigned char *buf); 284 285s32 286krb5_get_seq_num(struct krb5_ctx *kctx, 287 unsigned char *cksum, 288 unsigned char *buf, int *direction, u32 *seqnum); 289 290int 291xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen); 292 293u32 294krb5_derive_key(const struct gss_krb5_enctype *gk5e, 295 const struct xdr_netobj *inkey, 296 struct xdr_netobj *outkey, 297 const struct xdr_netobj *in_constant, 298 gfp_t gfp_mask); 299 300u32 301gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e, 302 struct xdr_netobj *randombits, 303 struct xdr_netobj *key); 304 305u32 306gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e, 307 struct xdr_netobj *randombits, 308 struct xdr_netobj *key); 309 310u32 311gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset, 312 struct xdr_buf *buf, int ec, 313 struct page **pages); 314 315u32 316gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, 317 struct xdr_buf *buf, u32 *plainoffset, 318 u32 *plainlen); 319 320int 321krb5_rc4_setup_seq_key(struct krb5_ctx *kctx, 322 struct crypto_blkcipher *cipher, 323 unsigned char *cksum); 324 325int 326krb5_rc4_setup_enc_key(struct krb5_ctx *kctx, 327 struct crypto_blkcipher *cipher, 328 s32 seqnum); 329void 330gss_krb5_make_confounder(char *p, u32 conflen); 331