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1f4c86c0be
Again, we can deadlock if the memory reclaim triggers a writeback that requires a rpcsec_gss credential lookup. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
332 lines
11 KiB
C
332 lines
11 KiB
C
/*
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* linux/include/linux/sunrpc/gss_krb5_types.h
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*
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* Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
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* lib/gssapi/krb5/gssapiP_krb5.h, and others
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*
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* Copyright (c) 2000-2008 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@umich.edu>
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* Bruce Fields <bfields@umich.edu>
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*/
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/*
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* Copyright 1995 by the Massachusetts Institute of Technology.
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* All Rights Reserved.
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*
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* Export of this software from the United States of America may
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* require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. Furthermore if you modify this software you must label
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* your software as modified software and not distribute it in such a
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* fashion that it might be confused with the original M.I.T. software.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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*/
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#include <linux/crypto.h>
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#include <linux/sunrpc/auth_gss.h>
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#include <linux/sunrpc/gss_err.h>
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#include <linux/sunrpc/gss_asn1.h>
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/* Length of constant used in key derivation */
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#define GSS_KRB5_K5CLENGTH (5)
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/* Maximum key length (in bytes) for the supported crypto algorithms*/
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#define GSS_KRB5_MAX_KEYLEN (32)
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/* Maximum checksum function output for the supported crypto algorithms */
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#define GSS_KRB5_MAX_CKSUM_LEN (20)
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/* Maximum blocksize for the supported crypto algorithms */
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#define GSS_KRB5_MAX_BLOCKSIZE (16)
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struct krb5_ctx;
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struct gss_krb5_enctype {
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const u32 etype; /* encryption (key) type */
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const u32 ctype; /* checksum type */
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const char *name; /* "friendly" name */
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const char *encrypt_name; /* crypto encrypt name */
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const char *cksum_name; /* crypto checksum name */
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const u16 signalg; /* signing algorithm */
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const u16 sealalg; /* sealing algorithm */
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const u32 blocksize; /* encryption blocksize */
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const u32 conflen; /* confounder length
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(normally the same as
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the blocksize) */
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const u32 cksumlength; /* checksum length */
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const u32 keyed_cksum; /* is it a keyed cksum? */
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const u32 keybytes; /* raw key len, in bytes */
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const u32 keylength; /* final key len, in bytes */
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u32 (*encrypt) (struct crypto_blkcipher *tfm,
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void *iv, void *in, void *out,
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int length); /* encryption function */
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u32 (*decrypt) (struct crypto_blkcipher *tfm,
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void *iv, void *in, void *out,
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int length); /* decryption function */
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u32 (*mk_key) (const struct gss_krb5_enctype *gk5e,
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struct xdr_netobj *in,
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struct xdr_netobj *out); /* complete key generation */
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u32 (*encrypt_v2) (struct krb5_ctx *kctx, u32 offset,
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struct xdr_buf *buf, int ec,
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struct page **pages); /* v2 encryption function */
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u32 (*decrypt_v2) (struct krb5_ctx *kctx, u32 offset,
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struct xdr_buf *buf, u32 *headskip,
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u32 *tailskip); /* v2 decryption function */
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};
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/* krb5_ctx flags definitions */
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#define KRB5_CTX_FLAG_INITIATOR 0x00000001
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#define KRB5_CTX_FLAG_CFX 0x00000002
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#define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY 0x00000004
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struct krb5_ctx {
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int initiate; /* 1 = initiating, 0 = accepting */
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u32 enctype;
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u32 flags;
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const struct gss_krb5_enctype *gk5e; /* enctype-specific info */
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struct crypto_blkcipher *enc;
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struct crypto_blkcipher *seq;
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struct crypto_blkcipher *acceptor_enc;
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struct crypto_blkcipher *initiator_enc;
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struct crypto_blkcipher *acceptor_enc_aux;
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struct crypto_blkcipher *initiator_enc_aux;
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u8 Ksess[GSS_KRB5_MAX_KEYLEN]; /* session key */
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u8 cksum[GSS_KRB5_MAX_KEYLEN];
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s32 endtime;
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u32 seq_send;
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u64 seq_send64;
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struct xdr_netobj mech_used;
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u8 initiator_sign[GSS_KRB5_MAX_KEYLEN];
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u8 acceptor_sign[GSS_KRB5_MAX_KEYLEN];
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u8 initiator_seal[GSS_KRB5_MAX_KEYLEN];
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u8 acceptor_seal[GSS_KRB5_MAX_KEYLEN];
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u8 initiator_integ[GSS_KRB5_MAX_KEYLEN];
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u8 acceptor_integ[GSS_KRB5_MAX_KEYLEN];
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};
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extern spinlock_t krb5_seq_lock;
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/* The length of the Kerberos GSS token header */
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#define GSS_KRB5_TOK_HDR_LEN (16)
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#define KG_TOK_MIC_MSG 0x0101
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#define KG_TOK_WRAP_MSG 0x0201
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#define KG2_TOK_INITIAL 0x0101
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#define KG2_TOK_RESPONSE 0x0202
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#define KG2_TOK_MIC 0x0404
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#define KG2_TOK_WRAP 0x0504
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#define KG2_TOKEN_FLAG_SENTBYACCEPTOR 0x01
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#define KG2_TOKEN_FLAG_SEALED 0x02
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#define KG2_TOKEN_FLAG_ACCEPTORSUBKEY 0x04
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#define KG2_RESP_FLAG_ERROR 0x0001
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#define KG2_RESP_FLAG_DELEG_OK 0x0002
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enum sgn_alg {
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SGN_ALG_DES_MAC_MD5 = 0x0000,
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SGN_ALG_MD2_5 = 0x0001,
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SGN_ALG_DES_MAC = 0x0002,
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SGN_ALG_3 = 0x0003, /* not published */
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SGN_ALG_HMAC_MD5 = 0x0011, /* microsoft w2k; no support */
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SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004
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};
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enum seal_alg {
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SEAL_ALG_NONE = 0xffff,
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SEAL_ALG_DES = 0x0000,
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SEAL_ALG_1 = 0x0001, /* not published */
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SEAL_ALG_MICROSOFT_RC4 = 0x0010,/* microsoft w2k; no support */
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SEAL_ALG_DES3KD = 0x0002
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};
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#define CKSUMTYPE_CRC32 0x0001
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#define CKSUMTYPE_RSA_MD4 0x0002
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#define CKSUMTYPE_RSA_MD4_DES 0x0003
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#define CKSUMTYPE_DESCBC 0x0004
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#define CKSUMTYPE_RSA_MD5 0x0007
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#define CKSUMTYPE_RSA_MD5_DES 0x0008
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#define CKSUMTYPE_NIST_SHA 0x0009
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#define CKSUMTYPE_HMAC_SHA1_DES3 0x000c
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#define CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f
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#define CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010
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#define CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /* Microsoft md5 hmac cksumtype */
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/* from gssapi_err_krb5.h */
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#define KG_CCACHE_NOMATCH (39756032L)
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#define KG_KEYTAB_NOMATCH (39756033L)
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#define KG_TGT_MISSING (39756034L)
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#define KG_NO_SUBKEY (39756035L)
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#define KG_CONTEXT_ESTABLISHED (39756036L)
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#define KG_BAD_SIGN_TYPE (39756037L)
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#define KG_BAD_LENGTH (39756038L)
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#define KG_CTX_INCOMPLETE (39756039L)
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#define KG_CONTEXT (39756040L)
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#define KG_CRED (39756041L)
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#define KG_ENC_DESC (39756042L)
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#define KG_BAD_SEQ (39756043L)
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#define KG_EMPTY_CCACHE (39756044L)
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#define KG_NO_CTYPES (39756045L)
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/* per Kerberos v5 protocol spec crypto types from the wire.
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* these get mapped to linux kernel crypto routines.
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*/
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#define ENCTYPE_NULL 0x0000
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#define ENCTYPE_DES_CBC_CRC 0x0001 /* DES cbc mode with CRC-32 */
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#define ENCTYPE_DES_CBC_MD4 0x0002 /* DES cbc mode with RSA-MD4 */
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#define ENCTYPE_DES_CBC_MD5 0x0003 /* DES cbc mode with RSA-MD5 */
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#define ENCTYPE_DES_CBC_RAW 0x0004 /* DES cbc mode raw */
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/* XXX deprecated? */
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#define ENCTYPE_DES3_CBC_SHA 0x0005 /* DES-3 cbc mode with NIST-SHA */
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#define ENCTYPE_DES3_CBC_RAW 0x0006 /* DES-3 cbc mode raw */
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#define ENCTYPE_DES_HMAC_SHA1 0x0008
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#define ENCTYPE_DES3_CBC_SHA1 0x0010
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#define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011
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#define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012
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#define ENCTYPE_ARCFOUR_HMAC 0x0017
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#define ENCTYPE_ARCFOUR_HMAC_EXP 0x0018
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#define ENCTYPE_UNKNOWN 0x01ff
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/*
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* Constants used for key derivation
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*/
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/* for 3DES */
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#define KG_USAGE_SEAL (22)
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#define KG_USAGE_SIGN (23)
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#define KG_USAGE_SEQ (24)
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/* from rfc3961 */
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#define KEY_USAGE_SEED_CHECKSUM (0x99)
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#define KEY_USAGE_SEED_ENCRYPTION (0xAA)
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#define KEY_USAGE_SEED_INTEGRITY (0x55)
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/* from rfc4121 */
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#define KG_USAGE_ACCEPTOR_SEAL (22)
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#define KG_USAGE_ACCEPTOR_SIGN (23)
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#define KG_USAGE_INITIATOR_SEAL (24)
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#define KG_USAGE_INITIATOR_SIGN (25)
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/*
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* This compile-time check verifies that we will not exceed the
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* slack space allotted by the client and server auth_gss code
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* before they call gss_wrap().
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*/
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#define GSS_KRB5_MAX_SLACK_NEEDED \
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(GSS_KRB5_TOK_HDR_LEN /* gss token header */ \
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+ GSS_KRB5_MAX_CKSUM_LEN /* gss token checksum */ \
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+ GSS_KRB5_MAX_BLOCKSIZE /* confounder */ \
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+ GSS_KRB5_MAX_BLOCKSIZE /* possible padding */ \
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+ GSS_KRB5_TOK_HDR_LEN /* encrypted hdr in v2 token */\
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+ GSS_KRB5_MAX_CKSUM_LEN /* encryption hmac */ \
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+ 4 + 4 /* RPC verifier */ \
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+ GSS_KRB5_TOK_HDR_LEN \
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+ GSS_KRB5_MAX_CKSUM_LEN)
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u32
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make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
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struct xdr_buf *body, int body_offset, u8 *cksumkey,
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unsigned int usage, struct xdr_netobj *cksumout);
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u32
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make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
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struct xdr_buf *body, int body_offset, u8 *key,
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unsigned int usage, struct xdr_netobj *cksum);
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u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
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struct xdr_netobj *);
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u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
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struct xdr_netobj *);
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u32
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gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset,
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struct xdr_buf *outbuf, struct page **pages);
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u32
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gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset,
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struct xdr_buf *buf);
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u32
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krb5_encrypt(struct crypto_blkcipher *key,
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void *iv, void *in, void *out, int length);
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u32
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krb5_decrypt(struct crypto_blkcipher *key,
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void *iv, void *in, void *out, int length);
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int
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gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *outbuf,
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int offset, struct page **pages);
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int
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gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *inbuf,
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int offset);
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s32
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krb5_make_seq_num(struct krb5_ctx *kctx,
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struct crypto_blkcipher *key,
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int direction,
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u32 seqnum, unsigned char *cksum, unsigned char *buf);
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s32
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krb5_get_seq_num(struct krb5_ctx *kctx,
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unsigned char *cksum,
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unsigned char *buf, int *direction, u32 *seqnum);
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int
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xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen);
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u32
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krb5_derive_key(const struct gss_krb5_enctype *gk5e,
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const struct xdr_netobj *inkey,
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struct xdr_netobj *outkey,
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const struct xdr_netobj *in_constant,
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gfp_t gfp_mask);
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u32
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gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
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struct xdr_netobj *randombits,
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struct xdr_netobj *key);
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u32
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gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
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struct xdr_netobj *randombits,
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struct xdr_netobj *key);
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u32
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gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
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struct xdr_buf *buf, int ec,
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struct page **pages);
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u32
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gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset,
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struct xdr_buf *buf, u32 *plainoffset,
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u32 *plainlen);
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int
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krb5_rc4_setup_seq_key(struct krb5_ctx *kctx,
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struct crypto_blkcipher *cipher,
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unsigned char *cksum);
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int
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krb5_rc4_setup_enc_key(struct krb5_ctx *kctx,
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struct crypto_blkcipher *cipher,
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s32 seqnum);
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void
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gss_krb5_make_confounder(char *p, u32 conflen);
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