![Herbert Xu](/assets/img/avatar_default.png)
The skcpiher/shash conversion introduced a number of bugs in the
sunrpc code:
1) Missing calls to skcipher_request_set_tfm lead to crashes.
2) The allocation size of shash_desc is too small which leads to
memory corruption.
Fixes: 3b5cf20cf4
("sunrpc: Use skcipher and ahash/shash")
Reported-by: J. Bruce Fields <bfields@fieldses.org>
Tested-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
793 lines
20 KiB
C
793 lines
20 KiB
C
/*
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* linux/net/sunrpc/gss_krb5_mech.c
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*
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* Copyright (c) 2001-2008 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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* J. Bruce Fields <bfields@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <crypto/hash.h>
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#include <crypto/skcipher.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/gss_krb5.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/gss_krb5_enctypes.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
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static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
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/*
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* DES (All DES enctypes are mapped to the same gss functionality)
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*/
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{
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.etype = ENCTYPE_DES_CBC_RAW,
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.ctype = CKSUMTYPE_RSA_MD5,
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.name = "des-cbc-crc",
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.encrypt_name = "cbc(des)",
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.cksum_name = "md5",
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.encrypt = krb5_encrypt,
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.decrypt = krb5_decrypt,
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.mk_key = NULL,
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.signalg = SGN_ALG_DES_MAC_MD5,
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.sealalg = SEAL_ALG_DES,
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.keybytes = 7,
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.keylength = 8,
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.blocksize = 8,
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.conflen = 8,
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.cksumlength = 8,
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.keyed_cksum = 0,
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},
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/*
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* RC4-HMAC
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*/
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{
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.etype = ENCTYPE_ARCFOUR_HMAC,
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.ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
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.name = "rc4-hmac",
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.encrypt_name = "ecb(arc4)",
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.cksum_name = "hmac(md5)",
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.encrypt = krb5_encrypt,
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.decrypt = krb5_decrypt,
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.mk_key = NULL,
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.signalg = SGN_ALG_HMAC_MD5,
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.sealalg = SEAL_ALG_MICROSOFT_RC4,
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.keybytes = 16,
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.keylength = 16,
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.blocksize = 1,
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.conflen = 8,
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.cksumlength = 8,
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.keyed_cksum = 1,
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},
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/*
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* 3DES
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*/
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{
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.etype = ENCTYPE_DES3_CBC_RAW,
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.ctype = CKSUMTYPE_HMAC_SHA1_DES3,
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.name = "des3-hmac-sha1",
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.encrypt_name = "cbc(des3_ede)",
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.cksum_name = "hmac(sha1)",
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.encrypt = krb5_encrypt,
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.decrypt = krb5_decrypt,
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.mk_key = gss_krb5_des3_make_key,
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.signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
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.sealalg = SEAL_ALG_DES3KD,
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.keybytes = 21,
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.keylength = 24,
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.blocksize = 8,
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.conflen = 8,
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.cksumlength = 20,
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.keyed_cksum = 1,
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},
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/*
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* AES128
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*/
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{
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.etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
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.ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
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.name = "aes128-cts",
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.encrypt_name = "cts(cbc(aes))",
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.cksum_name = "hmac(sha1)",
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.encrypt = krb5_encrypt,
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.decrypt = krb5_decrypt,
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.mk_key = gss_krb5_aes_make_key,
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.encrypt_v2 = gss_krb5_aes_encrypt,
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.decrypt_v2 = gss_krb5_aes_decrypt,
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.signalg = -1,
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.sealalg = -1,
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.keybytes = 16,
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.keylength = 16,
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.blocksize = 16,
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.conflen = 16,
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.cksumlength = 12,
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.keyed_cksum = 1,
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},
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/*
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* AES256
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*/
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{
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.etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
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.ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
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.name = "aes256-cts",
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.encrypt_name = "cts(cbc(aes))",
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.cksum_name = "hmac(sha1)",
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.encrypt = krb5_encrypt,
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.decrypt = krb5_decrypt,
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.mk_key = gss_krb5_aes_make_key,
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.encrypt_v2 = gss_krb5_aes_encrypt,
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.decrypt_v2 = gss_krb5_aes_decrypt,
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.signalg = -1,
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.sealalg = -1,
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.keybytes = 32,
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.keylength = 32,
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.blocksize = 16,
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.conflen = 16,
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.cksumlength = 12,
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.keyed_cksum = 1,
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},
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};
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static const int num_supported_enctypes =
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ARRAY_SIZE(supported_gss_krb5_enctypes);
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static int
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supported_gss_krb5_enctype(int etype)
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{
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int i;
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for (i = 0; i < num_supported_enctypes; i++)
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if (supported_gss_krb5_enctypes[i].etype == etype)
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return 1;
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return 0;
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}
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static const struct gss_krb5_enctype *
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get_gss_krb5_enctype(int etype)
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{
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int i;
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for (i = 0; i < num_supported_enctypes; i++)
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if (supported_gss_krb5_enctypes[i].etype == etype)
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return &supported_gss_krb5_enctypes[i];
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return NULL;
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}
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static const void *
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simple_get_bytes(const void *p, const void *end, void *res, int len)
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{
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const void *q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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memcpy(res, p, len);
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return q;
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}
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static const void *
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simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
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{
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const void *q;
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unsigned int len;
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p = simple_get_bytes(p, end, &len, sizeof(len));
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if (IS_ERR(p))
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return p;
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q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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res->data = kmemdup(p, len, GFP_NOFS);
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if (unlikely(res->data == NULL))
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return ERR_PTR(-ENOMEM);
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res->len = len;
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return q;
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}
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static inline const void *
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get_key(const void *p, const void *end,
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struct krb5_ctx *ctx, struct crypto_skcipher **res)
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{
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struct xdr_netobj key;
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int alg;
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p = simple_get_bytes(p, end, &alg, sizeof(alg));
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if (IS_ERR(p))
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goto out_err;
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switch (alg) {
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case ENCTYPE_DES_CBC_CRC:
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case ENCTYPE_DES_CBC_MD4:
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case ENCTYPE_DES_CBC_MD5:
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/* Map all these key types to ENCTYPE_DES_CBC_RAW */
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alg = ENCTYPE_DES_CBC_RAW;
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break;
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}
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if (!supported_gss_krb5_enctype(alg)) {
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printk(KERN_WARNING "gss_kerberos_mech: unsupported "
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"encryption key algorithm %d\n", alg);
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p = ERR_PTR(-EINVAL);
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goto out_err;
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}
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p = simple_get_netobj(p, end, &key);
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if (IS_ERR(p))
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goto out_err;
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*res = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(*res)) {
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printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
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"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
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*res = NULL;
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goto out_err_free_key;
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}
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if (crypto_skcipher_setkey(*res, key.data, key.len)) {
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printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
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"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
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goto out_err_free_tfm;
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}
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kfree(key.data);
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return p;
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out_err_free_tfm:
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crypto_free_skcipher(*res);
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out_err_free_key:
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kfree(key.data);
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p = ERR_PTR(-EINVAL);
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out_err:
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return p;
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}
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static int
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gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
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{
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int tmp;
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p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
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if (IS_ERR(p))
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goto out_err;
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/* Old format supports only DES! Any other enctype uses new format */
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ctx->enctype = ENCTYPE_DES_CBC_RAW;
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ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
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if (ctx->gk5e == NULL) {
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p = ERR_PTR(-EINVAL);
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goto out_err;
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}
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/* The downcall format was designed before we completely understood
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* the uses of the context fields; so it includes some stuff we
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* just give some minimal sanity-checking, and some we ignore
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* completely (like the next twenty bytes): */
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if (unlikely(p + 20 > end || p + 20 < p)) {
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p = ERR_PTR(-EFAULT);
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goto out_err;
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}
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p += 20;
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p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
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if (IS_ERR(p))
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goto out_err;
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if (tmp != SGN_ALG_DES_MAC_MD5) {
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p = ERR_PTR(-ENOSYS);
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goto out_err;
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}
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p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
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if (IS_ERR(p))
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goto out_err;
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if (tmp != SEAL_ALG_DES) {
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p = ERR_PTR(-ENOSYS);
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goto out_err;
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}
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p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
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if (IS_ERR(p))
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goto out_err;
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p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
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if (IS_ERR(p))
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goto out_err;
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p = simple_get_netobj(p, end, &ctx->mech_used);
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if (IS_ERR(p))
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goto out_err;
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p = get_key(p, end, ctx, &ctx->enc);
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if (IS_ERR(p))
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goto out_err_free_mech;
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p = get_key(p, end, ctx, &ctx->seq);
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if (IS_ERR(p))
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goto out_err_free_key1;
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if (p != end) {
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p = ERR_PTR(-EFAULT);
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goto out_err_free_key2;
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}
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return 0;
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out_err_free_key2:
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crypto_free_skcipher(ctx->seq);
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out_err_free_key1:
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crypto_free_skcipher(ctx->enc);
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out_err_free_mech:
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kfree(ctx->mech_used.data);
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out_err:
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return PTR_ERR(p);
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}
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static struct crypto_skcipher *
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context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
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{
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struct crypto_skcipher *cp;
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cp = crypto_alloc_skcipher(cname, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(cp)) {
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dprintk("gss_kerberos_mech: unable to initialize "
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"crypto algorithm %s\n", cname);
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return NULL;
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}
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if (crypto_skcipher_setkey(cp, key, ctx->gk5e->keylength)) {
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dprintk("gss_kerberos_mech: error setting key for "
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"crypto algorithm %s\n", cname);
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crypto_free_skcipher(cp);
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return NULL;
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}
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return cp;
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}
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static inline void
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set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
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{
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cdata[0] = (usage>>24)&0xff;
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cdata[1] = (usage>>16)&0xff;
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cdata[2] = (usage>>8)&0xff;
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cdata[3] = usage&0xff;
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cdata[4] = seed;
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}
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static int
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context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
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{
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struct xdr_netobj c, keyin, keyout;
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u8 cdata[GSS_KRB5_K5CLENGTH];
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u32 err;
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c.len = GSS_KRB5_K5CLENGTH;
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c.data = cdata;
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keyin.data = ctx->Ksess;
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keyin.len = ctx->gk5e->keylength;
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keyout.len = ctx->gk5e->keylength;
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/* seq uses the raw key */
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ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
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ctx->Ksess);
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if (ctx->seq == NULL)
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goto out_err;
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ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
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ctx->Ksess);
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if (ctx->enc == NULL)
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goto out_free_seq;
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/* derive cksum */
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set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
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keyout.data = ctx->cksum;
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err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
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if (err) {
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dprintk("%s: Error %d deriving cksum key\n",
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__func__, err);
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goto out_free_enc;
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}
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return 0;
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out_free_enc:
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crypto_free_skcipher(ctx->enc);
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out_free_seq:
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crypto_free_skcipher(ctx->seq);
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out_err:
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return -EINVAL;
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}
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/*
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* Note that RC4 depends on deriving keys using the sequence
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* number or the checksum of a token. Therefore, the final keys
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* cannot be calculated until the token is being constructed!
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*/
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static int
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context_derive_keys_rc4(struct krb5_ctx *ctx)
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{
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struct crypto_shash *hmac;
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char sigkeyconstant[] = "signaturekey";
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int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
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struct shash_desc *desc;
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int err;
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dprintk("RPC: %s: entered\n", __func__);
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/*
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* derive cksum (aka Ksign) key
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*/
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hmac = crypto_alloc_shash(ctx->gk5e->cksum_name, 0, 0);
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if (IS_ERR(hmac)) {
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dprintk("%s: error %ld allocating hash '%s'\n",
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__func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
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err = PTR_ERR(hmac);
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goto out_err;
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}
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err = crypto_shash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
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if (err)
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goto out_err_free_hmac;
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desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac),
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GFP_KERNEL);
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if (!desc) {
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dprintk("%s: failed to allocate hash descriptor for '%s'\n",
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__func__, ctx->gk5e->cksum_name);
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err = -ENOMEM;
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goto out_err_free_hmac;
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}
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desc->tfm = hmac;
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desc->flags = 0;
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err = crypto_shash_digest(desc, sigkeyconstant, slen, ctx->cksum);
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kzfree(desc);
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if (err)
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goto out_err_free_hmac;
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/*
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* allocate hash, and skciphers for data and seqnum encryption
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*/
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ctx->enc = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(ctx->enc)) {
|
|
err = PTR_ERR(ctx->enc);
|
|
goto out_err_free_hmac;
|
|
}
|
|
|
|
ctx->seq = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(ctx->seq)) {
|
|
crypto_free_skcipher(ctx->enc);
|
|
err = PTR_ERR(ctx->seq);
|
|
goto out_err_free_hmac;
|
|
}
|
|
|
|
dprintk("RPC: %s: returning success\n", __func__);
|
|
|
|
err = 0;
|
|
|
|
out_err_free_hmac:
|
|
crypto_free_shash(hmac);
|
|
out_err:
|
|
dprintk("RPC: %s: returning %d\n", __func__, err);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
|
|
{
|
|
struct xdr_netobj c, keyin, keyout;
|
|
u8 cdata[GSS_KRB5_K5CLENGTH];
|
|
u32 err;
|
|
|
|
c.len = GSS_KRB5_K5CLENGTH;
|
|
c.data = cdata;
|
|
|
|
keyin.data = ctx->Ksess;
|
|
keyin.len = ctx->gk5e->keylength;
|
|
keyout.len = ctx->gk5e->keylength;
|
|
|
|
/* initiator seal encryption */
|
|
set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
|
|
keyout.data = ctx->initiator_seal;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving initiator_seal key\n",
|
|
__func__, err);
|
|
goto out_err;
|
|
}
|
|
ctx->initiator_enc = context_v2_alloc_cipher(ctx,
|
|
ctx->gk5e->encrypt_name,
|
|
ctx->initiator_seal);
|
|
if (ctx->initiator_enc == NULL)
|
|
goto out_err;
|
|
|
|
/* acceptor seal encryption */
|
|
set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
|
|
keyout.data = ctx->acceptor_seal;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving acceptor_seal key\n",
|
|
__func__, err);
|
|
goto out_free_initiator_enc;
|
|
}
|
|
ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
|
|
ctx->gk5e->encrypt_name,
|
|
ctx->acceptor_seal);
|
|
if (ctx->acceptor_enc == NULL)
|
|
goto out_free_initiator_enc;
|
|
|
|
/* initiator sign checksum */
|
|
set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
|
|
keyout.data = ctx->initiator_sign;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving initiator_sign key\n",
|
|
__func__, err);
|
|
goto out_free_acceptor_enc;
|
|
}
|
|
|
|
/* acceptor sign checksum */
|
|
set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
|
|
keyout.data = ctx->acceptor_sign;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving acceptor_sign key\n",
|
|
__func__, err);
|
|
goto out_free_acceptor_enc;
|
|
}
|
|
|
|
/* initiator seal integrity */
|
|
set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
|
|
keyout.data = ctx->initiator_integ;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving initiator_integ key\n",
|
|
__func__, err);
|
|
goto out_free_acceptor_enc;
|
|
}
|
|
|
|
/* acceptor seal integrity */
|
|
set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
|
|
keyout.data = ctx->acceptor_integ;
|
|
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
|
|
if (err) {
|
|
dprintk("%s: Error %d deriving acceptor_integ key\n",
|
|
__func__, err);
|
|
goto out_free_acceptor_enc;
|
|
}
|
|
|
|
switch (ctx->enctype) {
|
|
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
|
|
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
|
|
ctx->initiator_enc_aux =
|
|
context_v2_alloc_cipher(ctx, "cbc(aes)",
|
|
ctx->initiator_seal);
|
|
if (ctx->initiator_enc_aux == NULL)
|
|
goto out_free_acceptor_enc;
|
|
ctx->acceptor_enc_aux =
|
|
context_v2_alloc_cipher(ctx, "cbc(aes)",
|
|
ctx->acceptor_seal);
|
|
if (ctx->acceptor_enc_aux == NULL) {
|
|
crypto_free_skcipher(ctx->initiator_enc_aux);
|
|
goto out_free_acceptor_enc;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_acceptor_enc:
|
|
crypto_free_skcipher(ctx->acceptor_enc);
|
|
out_free_initiator_enc:
|
|
crypto_free_skcipher(ctx->initiator_enc);
|
|
out_err:
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int
|
|
gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
|
|
gfp_t gfp_mask)
|
|
{
|
|
int keylen;
|
|
|
|
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, &ctx->endtime, sizeof(ctx->endtime));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
/* set seq_send for use by "older" enctypes */
|
|
ctx->seq_send = ctx->seq_send64;
|
|
if (ctx->seq_send64 != ctx->seq_send) {
|
|
dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
|
|
(unsigned long)ctx->seq_send64, 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;
|
|
/* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
|
|
if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
|
|
ctx->enctype = ENCTYPE_DES3_CBC_RAW;
|
|
ctx->gk5e = get_gss_krb5_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;
|
|
|
|
switch (ctx->enctype) {
|
|
case ENCTYPE_DES3_CBC_RAW:
|
|
return context_derive_keys_des3(ctx, gfp_mask);
|
|
case ENCTYPE_ARCFOUR_HMAC:
|
|
return context_derive_keys_rc4(ctx);
|
|
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
|
|
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
|
|
return context_derive_keys_new(ctx, gfp_mask);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
out_err:
|
|
return PTR_ERR(p);
|
|
}
|
|
|
|
static int
|
|
gss_import_sec_context_kerberos(const void *p, size_t len,
|
|
struct gss_ctx *ctx_id,
|
|
time_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;
|
|
|
|
if (len == 85)
|
|
ret = gss_import_v1_context(p, end, ctx);
|
|
else
|
|
ret = gss_import_v2_context(p, end, ctx, gfp_mask);
|
|
|
|
if (ret == 0) {
|
|
ctx_id->internal_ctx_id = ctx;
|
|
if (endtime)
|
|
*endtime = ctx->endtime;
|
|
} else
|
|
kfree(ctx);
|
|
|
|
dprintk("RPC: %s: returning %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gss_delete_sec_context_kerberos(void *internal_ctx) {
|
|
struct krb5_ctx *kctx = internal_ctx;
|
|
|
|
crypto_free_skcipher(kctx->seq);
|
|
crypto_free_skcipher(kctx->enc);
|
|
crypto_free_skcipher(kctx->acceptor_enc);
|
|
crypto_free_skcipher(kctx->initiator_enc);
|
|
crypto_free_skcipher(kctx->acceptor_enc_aux);
|
|
crypto_free_skcipher(kctx->initiator_enc_aux);
|
|
kfree(kctx->mech_used.data);
|
|
kfree(kctx);
|
|
}
|
|
|
|
static const struct gss_api_ops gss_kerberos_ops = {
|
|
.gss_import_sec_context = gss_import_sec_context_kerberos,
|
|
.gss_get_mic = gss_get_mic_kerberos,
|
|
.gss_verify_mic = gss_verify_mic_kerberos,
|
|
.gss_wrap = gss_wrap_kerberos,
|
|
.gss_unwrap = gss_unwrap_kerberos,
|
|
.gss_delete_sec_context = gss_delete_sec_context_kerberos,
|
|
};
|
|
|
|
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",
|
|
},
|
|
[2] = {
|
|
.pseudoflavor = RPC_AUTH_GSS_KRB5P,
|
|
.qop = GSS_C_QOP_DEFAULT,
|
|
.service = RPC_GSS_SVC_PRIVACY,
|
|
.name = "krb5p",
|
|
},
|
|
};
|
|
|
|
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 = KRB5_SUPPORTED_ENCTYPES,
|
|
};
|
|
|
|
static int __init init_kerberos_module(void)
|
|
{
|
|
int status;
|
|
|
|
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_LICENSE("GPL");
|
|
module_init(init_kerberos_module);
|
|
module_exit(cleanup_kerberos_module);
|