cregit-Linux how code gets into the kernel

Release 4.12 include/linux/sunrpc/gss_krb5.h

 *  linux/include/linux/sunrpc/gss_krb5_types.h
 *  Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
 *  lib/gssapi/krb5/gssapiP_krb5.h, and others
 *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
 *  All rights reserved.
 *  Andy Adamson   <>
 *  Bruce Fields   <>

 * Copyright 1995 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.

#include <crypto/skcipher.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/gss_asn1.h>

/* Length of constant used in key derivation */

#define GSS_KRB5_K5CLENGTH (5)

/* Maximum key length (in bytes) for the supported crypto algorithms*/

#define GSS_KRB5_MAX_KEYLEN (32)

/* Maximum checksum function output for the supported crypto algorithms */

#define GSS_KRB5_MAX_CKSUM_LEN  (20)

/* Maximum blocksize for the supported crypto algorithms */

#define GSS_KRB5_MAX_BLOCKSIZE  (16)

struct krb5_ctx;

struct gss_krb5_enctype {
const u32		etype;		/* encryption (key) type */
const u32		ctype;		/* checksum type */
const char		*name;		/* "friendly" name */
const char		*encrypt_name;	/* crypto encrypt name */
const char		*cksum_name;	/* crypto checksum name */
const u16		signalg;	/* signing algorithm */
const u16		sealalg;	/* sealing algorithm */
const u32		blocksize;	/* encryption blocksize */
const u32		conflen;	/* confounder length
                                                   (normally the same as
                                                   the blocksize) */
const u32		cksumlength;	/* checksum length */
const u32		keyed_cksum;	/* is it a keyed cksum? */
const u32		keybytes;	/* raw key len, in bytes */
const u32		keylength;	/* final key len, in bytes */
u32 (*encrypt) (struct crypto_skcipher *tfm,
			void *iv, void *in, void *out,
			int length);		/* encryption function */
u32 (*decrypt) (struct crypto_skcipher *tfm,
			void *iv, void *in, void *out,
			int length);		/* decryption function */
u32 (*mk_key) (const struct gss_krb5_enctype *gk5e,
		       struct xdr_netobj *in,
		       struct xdr_netobj *out);	/* complete key generation */
u32 (*encrypt_v2) (struct krb5_ctx *kctx, u32 offset,
			   struct xdr_buf *buf,
			   struct page **pages); /* v2 encryption function */
u32 (*decrypt_v2) (struct krb5_ctx *kctx, u32 offset,
			   struct xdr_buf *buf, u32 *headskip,
			   u32 *tailskip);	/* v2 decryption function */

/* krb5_ctx flags definitions */

#define KRB5_CTX_FLAG_INITIATOR         0x00000001

#define KRB5_CTX_FLAG_CFX               0x00000002

#define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY   0x00000004

struct krb5_ctx {
int			initiate; /* 1 = initiating, 0 = accepting */
u32			enctype;
u32			flags;
const struct gss_krb5_enctype *gk5e; /* enctype-specific info */
struct crypto_skcipher	*enc;
struct crypto_skcipher	*seq;
struct crypto_skcipher *acceptor_enc;
struct crypto_skcipher *initiator_enc;
struct crypto_skcipher *acceptor_enc_aux;
struct crypto_skcipher *initiator_enc_aux;
u8			Ksess[GSS_KRB5_MAX_KEYLEN]; /* session key */
u8			cksum[GSS_KRB5_MAX_KEYLEN];
s32			endtime;
u32			seq_send;
u64			seq_send64;
struct xdr_netobj	mech_used;
u8			initiator_sign[GSS_KRB5_MAX_KEYLEN];
u8			acceptor_sign[GSS_KRB5_MAX_KEYLEN];
u8			initiator_seal[GSS_KRB5_MAX_KEYLEN];
u8			acceptor_seal[GSS_KRB5_MAX_KEYLEN];
u8			initiator_integ[GSS_KRB5_MAX_KEYLEN];
u8			acceptor_integ[GSS_KRB5_MAX_KEYLEN];

extern spinlock_t krb5_seq_lock;

/* The length of the Kerberos GSS token header */

#define GSS_KRB5_TOK_HDR_LEN	(16)

#define KG_TOK_MIC_MSG    0x0101

#define KG_TOK_WRAP_MSG   0x0201

#define KG2_TOK_INITIAL     0x0101

#define KG2_TOK_RESPONSE    0x0202

#define KG2_TOK_MIC         0x0404

#define KG2_TOK_WRAP        0x0504


#define KG2_TOKEN_FLAG_SEALED           0x02


#define KG2_RESP_FLAG_ERROR             0x0001

#define KG2_RESP_FLAG_DELEG_OK          0x0002

enum sgn_alg {
SGN_ALG_DES_MAC_MD5 = 0x0000,
SGN_ALG_MD2_5 = 0x0001,
SGN_ALG_DES_MAC = 0x0002,
SGN_ALG_3 = 0x0003,		/* not published */
SGN_ALG_HMAC_MD5 = 0x0011,	/* microsoft w2k; no support */

enum seal_alg {
SEAL_ALG_NONE = 0xffff,
SEAL_ALG_DES = 0x0000,
SEAL_ALG_1 = 0x0001,		/* not published */
SEAL_ALG_MICROSOFT_RC4 = 0x0010,/* microsoft w2k; no support */
SEAL_ALG_DES3KD = 0x0002

#define CKSUMTYPE_CRC32			0x0001

#define CKSUMTYPE_RSA_MD4		0x0002

#define CKSUMTYPE_RSA_MD4_DES		0x0003

#define CKSUMTYPE_DESCBC		0x0004

#define CKSUMTYPE_RSA_MD5		0x0007

#define CKSUMTYPE_RSA_MD5_DES		0x0008

#define CKSUMTYPE_NIST_SHA		0x0009

#define CKSUMTYPE_HMAC_SHA1_DES3	0x000c

#define CKSUMTYPE_HMAC_SHA1_96_AES128   0x000f

#define CKSUMTYPE_HMAC_SHA1_96_AES256   0x0010

#define CKSUMTYPE_HMAC_MD5_ARCFOUR      -138 
/* Microsoft md5 hmac cksumtype */

/* from gssapi_err_krb5.h */

#define KG_CCACHE_NOMATCH                        (39756032L)

#define KG_KEYTAB_NOMATCH                        (39756033L)

#define KG_TGT_MISSING                           (39756034L)

#define KG_NO_SUBKEY                             (39756035L)

#define KG_CONTEXT_ESTABLISHED                   (39756036L)

#define KG_BAD_SIGN_TYPE                         (39756037L)

#define KG_BAD_LENGTH                            (39756038L)

#define KG_CTX_INCOMPLETE                        (39756039L)

#define KG_CONTEXT                               (39756040L)

#define KG_CRED                                  (39756041L)

#define KG_ENC_DESC                              (39756042L)

#define KG_BAD_SEQ                               (39756043L)

#define KG_EMPTY_CCACHE                          (39756044L)

#define KG_NO_CTYPES                             (39756045L)

/* per Kerberos v5 protocol spec crypto types from the wire. 
 * these get mapped to linux kernel crypto routines.  

#define ENCTYPE_NULL            0x0000

#define ENCTYPE_DES_CBC_CRC     0x0001	
/* DES cbc mode with CRC-32 */

#define ENCTYPE_DES_CBC_MD4     0x0002	
/* DES cbc mode with RSA-MD4 */

#define ENCTYPE_DES_CBC_MD5     0x0003	
/* DES cbc mode with RSA-MD5 */

#define ENCTYPE_DES_CBC_RAW     0x0004	
/* DES cbc mode raw */
/* XXX deprecated? */

#define ENCTYPE_DES3_CBC_SHA    0x0005	
/* DES-3 cbc mode with NIST-SHA */

#define ENCTYPE_DES3_CBC_RAW    0x0006	
/* DES-3 cbc mode raw */

#define ENCTYPE_DES_HMAC_SHA1   0x0008

#define ENCTYPE_DES3_CBC_SHA1   0x0010

#define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011

#define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012

#define ENCTYPE_ARCFOUR_HMAC            0x0017

#define ENCTYPE_ARCFOUR_HMAC_EXP        0x0018

#define ENCTYPE_UNKNOWN         0x01ff

 * Constants used for key derivation
/* for 3DES */

#define KG_USAGE_SEAL (22)

#define KG_USAGE_SIGN (23)

#define KG_USAGE_SEQ  (24)

/* from rfc3961 */

#define KEY_USAGE_SEED_CHECKSUM         (0x99)


#define KEY_USAGE_SEED_INTEGRITY        (0x55)

/* from rfc4121 */





 * This compile-time check verifies that we will not exceed the
 * slack space allotted by the client and server auth_gss code
 * before they call gss_wrap().

	(GSS_KRB5_TOK_HDR_LEN     /* gss token header */         \
        + GSS_KRB5_MAX_CKSUM_LEN  /* gss token checksum */       \
        + GSS_KRB5_MAX_BLOCKSIZE  /* confounder */               \
        + GSS_KRB5_MAX_BLOCKSIZE  /* possible padding */         \
        + GSS_KRB5_TOK_HDR_LEN    /* encrypted hdr in v2 token */\
        + GSS_KRB5_MAX_CKSUM_LEN  /* encryption hmac */          \
        + 4 + 4                   /* RPC verifier */             \
        + GSS_KRB5_TOK_HDR_LEN                                   \

make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
		struct xdr_buf *body, int body_offset, u8 *cksumkey,
		unsigned int usage, struct xdr_netobj *cksumout);

make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
		 struct xdr_buf *body, int body_offset, u8 *key,
		 unsigned int usage, struct xdr_netobj *cksum);

u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
		struct xdr_netobj *);

u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
		struct xdr_netobj *);

gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset,
		struct xdr_buf *outbuf, struct page **pages);

gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset,
		struct xdr_buf *buf);

krb5_encrypt(struct crypto_skcipher *key,
	     void *iv, void *in, void *out, int length);

krb5_decrypt(struct crypto_skcipher *key,
	     void *iv, void *in, void *out, int length); 

gss_encrypt_xdr_buf(struct crypto_skcipher *tfm, struct xdr_buf *outbuf,
		    int offset, struct page **pages);

gss_decrypt_xdr_buf(struct crypto_skcipher *tfm, struct xdr_buf *inbuf,
		    int offset);

krb5_make_seq_num(struct krb5_ctx *kctx,
		struct crypto_skcipher *key,
		int direction,
		u32 seqnum, unsigned char *cksum, unsigned char *buf);

krb5_get_seq_num(struct krb5_ctx *kctx,
	       unsigned char *cksum,
	       unsigned char *buf, int *direction, u32 *seqnum);

xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen);

krb5_derive_key(const struct gss_krb5_enctype *gk5e,
		const struct xdr_netobj *inkey,
		struct xdr_netobj *outkey,
		const struct xdr_netobj *in_constant,
		gfp_t gfp_mask);

gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
		       struct xdr_netobj *randombits,
		       struct xdr_netobj *key);

gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
		      struct xdr_netobj *randombits,
		      struct xdr_netobj *key);

gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
		     struct xdr_buf *buf,
		     struct page **pages);

gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset,
		     struct xdr_buf *buf, u32 *plainoffset,
		     u32 *plainlen);

krb5_rc4_setup_seq_key(struct krb5_ctx *kctx,
		       struct crypto_skcipher *cipher,
		       unsigned char *cksum);

krb5_rc4_setup_enc_key(struct krb5_ctx *kctx,
		       struct crypto_skcipher *cipher,
		       s32 seqnum);
gss_krb5_make_confounder(char *p, u32 conflen);

Overall Contributors

Kevin Coffman69658.78%1661.54%
Trond Myklebust38032.09%519.23%
J. Bruce Fields927.77%415.38%
Herbert Xu161.35%13.85%
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