Quelle  gss_krb5_mech.c   Sprache: C

// SPDX-License-Identifier: BSD-3-Clause
/*
 *  linux/net/sunrpc/gss_krb5_mech.c
 *
 *  Copyright (c) 2001-2008 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson <andros@umich.edu>
 *  J. Bruce Fields <bfields@umich.edu>
 */

#include <crypto/hash.h>
#include <crypto/skcipher.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/gss_krb5.h>
#include <linux/sunrpc/xdr.h>
#include <kunit/visibility.h>

#include "auth_gss_internal.h"
#include "gss_krb5_internal.h"

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif

static struct gss_api_mech gss_kerberos_mech;

static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1)
 /*
 * AES-128 with SHA-1 (RFC 3962)
 */
 {
   .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
   .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
   .name = "aes128-cts",
   .encrypt_name = "cts(cbc(aes))",
   .aux_cipher = "cbc(aes)",
   .cksum_name = "hmac(sha1)",
   .derive_key = krb5_derive_key_v2,
   .encrypt = gss_krb5_aes_encrypt,
   .decrypt = gss_krb5_aes_decrypt,

   .get_mic = gss_krb5_get_mic_v2,
   .verify_mic = gss_krb5_verify_mic_v2,
   .wrap = gss_krb5_wrap_v2,
   .unwrap = gss_krb5_unwrap_v2,

   .signalg = -1,
   .sealalg = -1,
   .keybytes = 16,
   .keylength = BITS2OCTETS(128),
   .Kc_length = BITS2OCTETS(128),
   .Ke_length = BITS2OCTETS(128),
   .Ki_length = BITS2OCTETS(128),
   .cksumlength = BITS2OCTETS(96),
   .keyed_cksum = 1,
 },
 /*
 * AES-256 with SHA-1 (RFC 3962)
 */
 {
   .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
   .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
   .name = "aes256-cts",
   .encrypt_name = "cts(cbc(aes))",
   .aux_cipher = "cbc(aes)",
   .cksum_name = "hmac(sha1)",
   .derive_key = krb5_derive_key_v2,
   .encrypt = gss_krb5_aes_encrypt,
   .decrypt = gss_krb5_aes_decrypt,

   .get_mic = gss_krb5_get_mic_v2,
   .verify_mic = gss_krb5_verify_mic_v2,
   .wrap = gss_krb5_wrap_v2,
   .unwrap = gss_krb5_unwrap_v2,

   .signalg = -1,
   .sealalg = -1,
   .keybytes = 32,
   .keylength = BITS2OCTETS(256),
   .Kc_length = BITS2OCTETS(256),
   .Ke_length = BITS2OCTETS(256),
   .Ki_length = BITS2OCTETS(256),
   .cksumlength = BITS2OCTETS(96),
   .keyed_cksum = 1,
 },
#endif

#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA)
 /*
 * Camellia-128 with CMAC (RFC 6803)
 */
 {
  .etype  = ENCTYPE_CAMELLIA128_CTS_CMAC,
  .ctype  = CKSUMTYPE_CMAC_CAMELLIA128,
  .name  = "camellia128-cts-cmac",
  .encrypt_name = "cts(cbc(camellia))",
  .aux_cipher = "cbc(camellia)",
  .cksum_name = "cmac(camellia)",
  .cksumlength = BITS2OCTETS(128),
  .keyed_cksum = 1,
  .keylength = BITS2OCTETS(128),
  .Kc_length = BITS2OCTETS(128),
  .Ke_length = BITS2OCTETS(128),
  .Ki_length = BITS2OCTETS(128),

  .derive_key = krb5_kdf_feedback_cmac,
  .encrypt = gss_krb5_aes_encrypt,
  .decrypt = gss_krb5_aes_decrypt,

  .get_mic = gss_krb5_get_mic_v2,
  .verify_mic = gss_krb5_verify_mic_v2,
  .wrap  = gss_krb5_wrap_v2,
  .unwrap  = gss_krb5_unwrap_v2,
 },
 /*
 * Camellia-256 with CMAC (RFC 6803)
 */
 {
  .etype  = ENCTYPE_CAMELLIA256_CTS_CMAC,
  .ctype  = CKSUMTYPE_CMAC_CAMELLIA256,
  .name  = "camellia256-cts-cmac",
  .encrypt_name = "cts(cbc(camellia))",
  .aux_cipher = "cbc(camellia)",
  .cksum_name = "cmac(camellia)",
  .cksumlength = BITS2OCTETS(128),
  .keyed_cksum = 1,
  .keylength = BITS2OCTETS(256),
  .Kc_length = BITS2OCTETS(256),
  .Ke_length = BITS2OCTETS(256),
  .Ki_length = BITS2OCTETS(256),

  .derive_key = krb5_kdf_feedback_cmac,
  .encrypt = gss_krb5_aes_encrypt,
  .decrypt = gss_krb5_aes_decrypt,

  .get_mic = gss_krb5_get_mic_v2,
  .verify_mic = gss_krb5_verify_mic_v2,
  .wrap  = gss_krb5_wrap_v2,
  .unwrap  = gss_krb5_unwrap_v2,
 },
#endif

#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2)
 /*
 * AES-128 with SHA-256 (RFC 8009)
 */
 {
  .etype  = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
  .ctype  = CKSUMTYPE_HMAC_SHA256_128_AES128,
  .name  = "aes128-cts-hmac-sha256-128",
  .encrypt_name = "cts(cbc(aes))",
  .aux_cipher = "cbc(aes)",
  .cksum_name = "hmac(sha256)",
  .cksumlength = BITS2OCTETS(128),
  .keyed_cksum = 1,
  .keylength = BITS2OCTETS(128),
  .Kc_length = BITS2OCTETS(128),
  .Ke_length = BITS2OCTETS(128),
  .Ki_length = BITS2OCTETS(128),

  .derive_key = krb5_kdf_hmac_sha2,
  .encrypt = krb5_etm_encrypt,
  .decrypt = krb5_etm_decrypt,

  .get_mic = gss_krb5_get_mic_v2,
  .verify_mic = gss_krb5_verify_mic_v2,
  .wrap  = gss_krb5_wrap_v2,
  .unwrap  = gss_krb5_unwrap_v2,
 },
 /*
 * AES-256 with SHA-384 (RFC 8009)
 */
 {
  .etype  = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
  .ctype  = CKSUMTYPE_HMAC_SHA384_192_AES256,
  .name  = "aes256-cts-hmac-sha384-192",
  .encrypt_name = "cts(cbc(aes))",
  .aux_cipher = "cbc(aes)",
  .cksum_name = "hmac(sha384)",
  .cksumlength = BITS2OCTETS(192),
  .keyed_cksum = 1,
  .keylength = BITS2OCTETS(256),
  .Kc_length = BITS2OCTETS(192),
  .Ke_length = BITS2OCTETS(256),
  .Ki_length = BITS2OCTETS(192),

  .derive_key = krb5_kdf_hmac_sha2,
  .encrypt = krb5_etm_encrypt,
  .decrypt = krb5_etm_decrypt,

  .get_mic = gss_krb5_get_mic_v2,
  .verify_mic = gss_krb5_verify_mic_v2,
  .wrap  = gss_krb5_wrap_v2,
  .unwrap  = gss_krb5_unwrap_v2,
 },
#endif
};

/*
 * The list of advertised enctypes is specified in order of most
 * preferred to least.
 */
static char gss_krb5_enctype_priority_list[64];

static void gss_krb5_prepare_enctype_priority_list(void)
{
 static const u32 gss_krb5_enctypes[] = {
#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2)
  ENCTYPE_AES256_CTS_HMAC_SHA384_192,
  ENCTYPE_AES128_CTS_HMAC_SHA256_128,
#endif
#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA)
  ENCTYPE_CAMELLIA256_CTS_CMAC,
  ENCTYPE_CAMELLIA128_CTS_CMAC,
#endif
#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1)
  ENCTYPE_AES256_CTS_HMAC_SHA1_96,
  ENCTYPE_AES128_CTS_HMAC_SHA1_96,
#endif
 };
 size_t total, i;
 char buf[16];
 char *sep;
 int n;

 sep = "";
 gss_krb5_enctype_priority_list[0] = '\0';
 for (total = 0, i = 0; i < ARRAY_SIZE(gss_krb5_enctypes); i++) {
  n = sprintf(buf, "%s%u", sep, gss_krb5_enctypes[i]);
  if (n < 0)
   break;
  if (total + n >= sizeof(gss_krb5_enctype_priority_list))
   break;
  strcat(gss_krb5_enctype_priority_list, buf);
  sep = ",";
  total += n;
 }
}

/**
 * gss_krb5_lookup_enctype - Retrieve profile information for a given enctype
 * @etype: ENCTYPE value
 *
 * Returns a pointer to a gss_krb5_enctype structure, or NULL if no
 * matching etype is found.
 */
VISIBLE_IF_KUNIT
const struct gss_krb5_enctype *gss_krb5_lookup_enctype(u32 etype)
{
 size_t i;

 for (i = 0; i < ARRAY_SIZE(supported_gss_krb5_enctypes); i++)
  if (supported_gss_krb5_enctypes[i].etype == etype)
   return &supported_gss_krb5_enctypes[i];
 return NULL;
}
EXPORT_SYMBOL_IF_KUNIT(gss_krb5_lookup_enctype);

static struct crypto_sync_skcipher *
gss_krb5_alloc_cipher_v2(const char *cname, const struct xdr_netobj *key)
{
 struct crypto_sync_skcipher *tfm;

 tfm = crypto_alloc_sync_skcipher(cname, 0, 0);
 if (IS_ERR(tfm))
  return NULL;
 if (crypto_sync_skcipher_setkey(tfm, key->data, key->len)) {
  crypto_free_sync_skcipher(tfm);
  return NULL;
 }
 return tfm;
}

static struct crypto_ahash *
gss_krb5_alloc_hash_v2(struct krb5_ctx *kctx, const struct xdr_netobj *key)
{
 struct crypto_ahash *tfm;

 tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
 if (IS_ERR(tfm))
  return NULL;
 if (crypto_ahash_setkey(tfm, key->data, key->len)) {
  crypto_free_ahash(tfm);
  return NULL;
 }
 return tfm;
}

static int
gss_krb5_import_ctx_v2(struct krb5_ctx *ctx, gfp_t gfp_mask)
{
 struct xdr_netobj keyin = {
  .len = ctx->gk5e->keylength,
  .data = ctx->Ksess,
 };
 struct xdr_netobj keyout;
 int ret = -EINVAL;

 keyout.data = kmalloc(GSS_KRB5_MAX_KEYLEN, gfp_mask);
 if (!keyout.data)
  return -ENOMEM;

 /* initiator seal encryption */
 keyout.len = ctx->gk5e->Ke_length;
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL,
       KEY_USAGE_SEED_ENCRYPTION, gfp_mask))
  goto out;
 ctx->initiator_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name,
            &keyout);
 if (ctx->initiator_enc == NULL)
  goto out;
 if (ctx->gk5e->aux_cipher) {
  ctx->initiator_enc_aux =
   gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher,
       &keyout);
  if (ctx->initiator_enc_aux == NULL)
   goto out_free;
 }

 /* acceptor seal encryption */
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL,
       KEY_USAGE_SEED_ENCRYPTION, gfp_mask))
  goto out_free;
 ctx->acceptor_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name,
           &keyout);
 if (ctx->acceptor_enc == NULL)
  goto out_free;
 if (ctx->gk5e->aux_cipher) {
  ctx->acceptor_enc_aux =
   gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher,
       &keyout);
  if (ctx->acceptor_enc_aux == NULL)
   goto out_free;
 }

 /* initiator sign checksum */
 keyout.len = ctx->gk5e->Kc_length;
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SIGN,
       KEY_USAGE_SEED_CHECKSUM, gfp_mask))
  goto out_free;
 ctx->initiator_sign = gss_krb5_alloc_hash_v2(ctx, &keyout);
 if (ctx->initiator_sign == NULL)
  goto out_free;

 /* acceptor sign checksum */
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SIGN,
       KEY_USAGE_SEED_CHECKSUM, gfp_mask))
  goto out_free;
 ctx->acceptor_sign = gss_krb5_alloc_hash_v2(ctx, &keyout);
 if (ctx->acceptor_sign == NULL)
  goto out_free;

 /* initiator seal integrity */
 keyout.len = ctx->gk5e->Ki_length;
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL,
       KEY_USAGE_SEED_INTEGRITY, gfp_mask))
  goto out_free;
 ctx->initiator_integ = gss_krb5_alloc_hash_v2(ctx, &keyout);
 if (ctx->initiator_integ == NULL)
  goto out_free;

 /* acceptor seal integrity */
 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL,
       KEY_USAGE_SEED_INTEGRITY, gfp_mask))
  goto out_free;
 ctx->acceptor_integ = gss_krb5_alloc_hash_v2(ctx, &keyout);
 if (ctx->acceptor_integ == NULL)
  goto out_free;

 ret = 0;
out:
 kfree_sensitive(keyout.data);
 return ret;

out_free:
 crypto_free_ahash(ctx->acceptor_integ);
 crypto_free_ahash(ctx->initiator_integ);
 crypto_free_ahash(ctx->acceptor_sign);
 crypto_free_ahash(ctx->initiator_sign);
 crypto_free_sync_skcipher(ctx->acceptor_enc_aux);
 crypto_free_sync_skcipher(ctx->acceptor_enc);
 crypto_free_sync_skcipher(ctx->initiator_enc_aux);
 crypto_free_sync_skcipher(ctx->initiator_enc);
 goto out;
}

static int
gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
  gfp_t gfp_mask)
{
 u64 seq_send64;
 int keylen;
 u32 time32;
 int ret;

 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
 if (IS_ERR(p))
  goto out_err;
 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;

 p = simple_get_bytes(p, end, &time32, sizeof(time32));
 if (IS_ERR(p))
  goto out_err;
 /* unsigned 32-bit time overflows in year 2106 */
 ctx->endtime = (time64_t)time32;
 p = simple_get_bytes(p, end, &seq_send64, sizeof(seq_send64));
 if (IS_ERR(p))
  goto out_err;
 atomic64_set(&ctx->seq_send64, seq_send64);
 /* set seq_send for use by "older" enctypes */
 atomic_set(&ctx->seq_send, seq_send64);
 if (seq_send64 != atomic_read(&ctx->seq_send)) {
  dprintk("%s: seq_send64 %llx, seq_send %x overflow?\n", __func__,
   seq_send64, atomic_read(&ctx->seq_send));
  p = ERR_PTR(-EINVAL);
  goto out_err;
 }
 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
 if (IS_ERR(p))
  goto out_err;
 ctx->gk5e = gss_krb5_lookup_enctype(ctx->enctype);
 if (ctx->gk5e == NULL) {
  dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
   ctx->enctype);
  p = ERR_PTR(-EINVAL);
  goto out_err;
 }
 keylen = ctx->gk5e->keylength;

 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
 if (IS_ERR(p))
  goto out_err;

 if (p != end) {
  p = ERR_PTR(-EINVAL);
  goto out_err;
 }

 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
          gss_kerberos_mech.gm_oid.len, gfp_mask);
 if (unlikely(ctx->mech_used.data == NULL)) {
  p = ERR_PTR(-ENOMEM);
  goto out_err;
 }
 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;

 ret = gss_krb5_import_ctx_v2(ctx, gfp_mask);
 if (ret) {
  p = ERR_PTR(ret);
  goto out_free;
 }

 return 0;

out_free:
 kfree(ctx->mech_used.data);
out_err:
 return PTR_ERR(p);
}

static int
gss_krb5_import_sec_context(const void *p, size_t len, struct gss_ctx *ctx_id,
       time64_t *endtime, gfp_t gfp_mask)
{
 const void *end = (const void *)((const char *)p + len);
 struct  krb5_ctx *ctx;
 int ret;

 ctx = kzalloc(sizeof(*ctx), gfp_mask);
 if (ctx == NULL)
  return -ENOMEM;

 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
 memzero_explicit(&ctx->Ksess, sizeof(ctx->Ksess));
 if (ret) {
  kfree(ctx);
  return ret;
 }

 ctx_id->internal_ctx_id = ctx;
 if (endtime)
  *endtime = ctx->endtime;
 return 0;
}

static void
gss_krb5_delete_sec_context(void *internal_ctx)
{
 struct krb5_ctx *kctx = internal_ctx;

 crypto_free_sync_skcipher(kctx->seq);
 crypto_free_sync_skcipher(kctx->enc);
 crypto_free_sync_skcipher(kctx->acceptor_enc);
 crypto_free_sync_skcipher(kctx->initiator_enc);
 crypto_free_sync_skcipher(kctx->acceptor_enc_aux);
 crypto_free_sync_skcipher(kctx->initiator_enc_aux);
 crypto_free_ahash(kctx->acceptor_sign);
 crypto_free_ahash(kctx->initiator_sign);
 crypto_free_ahash(kctx->acceptor_integ);
 crypto_free_ahash(kctx->initiator_integ);
 kfree(kctx->mech_used.data);
 kfree(kctx);
}

/**
 * gss_krb5_get_mic - get_mic for the Kerberos GSS mechanism
 * @gctx: GSS context
 * @text: plaintext to checksum
 * @token: buffer into which to write the computed checksum
 *
 * Return values:
 *    %GSS_S_COMPLETE - success, and @token is filled in
 *    %GSS_S_FAILURE - checksum could not be generated
 *    %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
 */
static u32 gss_krb5_get_mic(struct gss_ctx *gctx, struct xdr_buf *text,
       struct xdr_netobj *token)
{
 struct krb5_ctx *kctx = gctx->internal_ctx_id;

 return kctx->gk5e->get_mic(kctx, text, token);
}

/**
 * gss_krb5_verify_mic - verify_mic for the Kerberos GSS mechanism
 * @gctx: GSS context
 * @message_buffer: plaintext to check
 * @read_token: received checksum to check
 *
 * Return values:
 *    %GSS_S_COMPLETE - computed and received checksums match
 *    %GSS_S_DEFECTIVE_TOKEN - received checksum is not valid
 *    %GSS_S_BAD_SIG - computed and received checksums do not match
 *    %GSS_S_FAILURE - received checksum could not be checked
 *    %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
 */
static u32 gss_krb5_verify_mic(struct gss_ctx *gctx,
          struct xdr_buf *message_buffer,
          struct xdr_netobj *read_token)
{
 struct krb5_ctx *kctx = gctx->internal_ctx_id;

 return kctx->gk5e->verify_mic(kctx, message_buffer, read_token);
}

/**
 * gss_krb5_wrap - gss_wrap for the Kerberos GSS mechanism
 * @gctx: initialized GSS context
 * @offset: byte offset in @buf to start writing the cipher text
 * @buf: OUT: send buffer
 * @pages: plaintext to wrap
 *
 * Return values:
 *    %GSS_S_COMPLETE - success, @buf has been updated
 *    %GSS_S_FAILURE - @buf could not be wrapped
 *    %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
 */
static u32 gss_krb5_wrap(struct gss_ctx *gctx, int offset,
    struct xdr_buf *buf, struct page **pages)
{
 struct krb5_ctx *kctx = gctx->internal_ctx_id;

 return kctx->gk5e->wrap(kctx, offset, buf, pages);
}

/**
 * gss_krb5_unwrap - gss_unwrap for the Kerberos GSS mechanism
 * @gctx: initialized GSS context
 * @offset: starting byte offset into @buf
 * @len: size of ciphertext to unwrap
 * @buf: ciphertext to unwrap
 *
 * Return values:
 *    %GSS_S_COMPLETE - success, @buf has been updated
 *    %GSS_S_DEFECTIVE_TOKEN - received blob is not valid
 *    %GSS_S_BAD_SIG - computed and received checksums do not match
 *    %GSS_S_FAILURE - @buf could not be unwrapped
 *    %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
 */
static u32 gss_krb5_unwrap(struct gss_ctx *gctx, int offset,
      int len, struct xdr_buf *buf)
{
 struct krb5_ctx *kctx = gctx->internal_ctx_id;

 return kctx->gk5e->unwrap(kctx, offset, len, buf,
      &gctx->slack, &gctx->align);
}

static const struct gss_api_ops gss_kerberos_ops = {
 .gss_import_sec_context = gss_krb5_import_sec_context,
 .gss_get_mic  = gss_krb5_get_mic,
 .gss_verify_mic  = gss_krb5_verify_mic,
 .gss_wrap  = gss_krb5_wrap,
 .gss_unwrap  = gss_krb5_unwrap,
 .gss_delete_sec_context = gss_krb5_delete_sec_context,
};

static struct pf_desc gss_kerberos_pfs[] = {
 [0] = {
  .pseudoflavor = RPC_AUTH_GSS_KRB5,
  .qop = GSS_C_QOP_DEFAULT,
  .service = RPC_GSS_SVC_NONE,
  .name = "krb5",
 },
 [1] = {
  .pseudoflavor = RPC_AUTH_GSS_KRB5I,
  .qop = GSS_C_QOP_DEFAULT,
  .service = RPC_GSS_SVC_INTEGRITY,
  .name = "krb5i",
  .datatouch = true,
 },
 [2] = {
  .pseudoflavor = RPC_AUTH_GSS_KRB5P,
  .qop = GSS_C_QOP_DEFAULT,
  .service = RPC_GSS_SVC_PRIVACY,
  .name = "krb5p",
  .datatouch = true,
 },
};

MODULE_ALIAS("rpc-auth-gss-krb5");
MODULE_ALIAS("rpc-auth-gss-krb5i");
MODULE_ALIAS("rpc-auth-gss-krb5p");
MODULE_ALIAS("rpc-auth-gss-390003");
MODULE_ALIAS("rpc-auth-gss-390004");
MODULE_ALIAS("rpc-auth-gss-390005");
MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");

static struct gss_api_mech gss_kerberos_mech = {
 .gm_name = "krb5",
 .gm_owner = THIS_MODULE,
 .gm_oid  = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
 .gm_ops  = &gss_kerberos_ops,
 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
 .gm_pfs  = gss_kerberos_pfs,
 .gm_upcall_enctypes = gss_krb5_enctype_priority_list,
};

static int __init init_kerberos_module(void)
{
 int status;

 gss_krb5_prepare_enctype_priority_list();
 status = gss_mech_register(&gss_kerberos_mech);
 if (status)
  printk("Failed to register kerberos gss mechanism!\n");
 return status;
}

static void __exit cleanup_kerberos_module(void)
{
 gss_mech_unregister(&gss_kerberos_mech);
}

MODULE_DESCRIPTION("Sun RPC Kerberos 5 module");
MODULE_LICENSE("GPL");
module_init(init_kerberos_module);
module_exit(cleanup_kerberos_module);