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fs: cifs: switch to RC4 library interface

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The CIFS code uses the sync skcipher API to invoke the ecb(arc4) skcipher,
of which only a single generic C code implementation exists. This means
that going through all the trouble of using scatterlists etc buys us
very little, and we're better off just invoking the arc4 library directly.

This also reverts commit 5f4b55699a ("CIFS: Fix BUG() in calc_seckey()"),
since it is no longer necessary to allocate sec_key on the heap.

Cc: linux-cifs@vger.kernel.org
Cc: Steve French <sfrench@samba.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-06-12 18:19:59 +02:00 committed by Herbert Xu
parent 0e5a610b5c
commit 97a5fee2bd
3 changed files with 17 additions and 48 deletions
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2
fs/cifs/Kconfig
View File

@ -9,7 +9,7 @@ config CIFS
select CRYPTO_SHA512
select CRYPTO_CMAC
select CRYPTO_HMAC
select CRYPTO_ARC4
select CRYPTO_LIB_ARC4
select CRYPTO_AEAD2
select CRYPTO_CCM
select CRYPTO_ECB

62
fs/cifs/cifsencrypt.c
View File

@ -33,7 +33,8 @@
#include <linux/ctype.h>
#include <linux/random.h>
#include <linux/highmem.h>
#include <crypto/skcipher.h>
#include <linux/fips.h>
#include <crypto/arc4.h>
#include <crypto/aead.h>
int __cifs_calc_signature(struct smb_rqst *rqst,
@ -772,63 +773,32 @@ setup_ntlmv2_rsp_ret:
int
calc_seckey(struct cifs_ses *ses)
{
int rc;
struct crypto_skcipher *tfm_arc4;
struct scatterlist sgin, sgout;
struct skcipher_request *req;
unsigned char *sec_key;
unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
struct arc4_ctx *ctx_arc4;
sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
if (sec_key == NULL)
return -ENOMEM;
if (fips_enabled)
return -ENODEV;
get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm_arc4)) {
rc = PTR_ERR(tfm_arc4);
cifs_dbg(VFS, "could not allocate crypto API arc4\n");
goto out;
ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
if (!ctx_arc4) {
cifs_dbg(VFS, "could not allocate arc4 context\n");
return -ENOMEM;
}
rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
CIFS_SESS_KEY_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set response as a key\n",
__func__);
goto out_free_cipher;
}
req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
if (!req) {
rc = -ENOMEM;
cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
goto out_free_cipher;
}
sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
rc = crypto_skcipher_encrypt(req);
skcipher_request_free(req);
if (rc) {
cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
goto out_free_cipher;
}
arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
CIFS_CPHTXT_SIZE);
/* make secondary_key/nonce as session key */
memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
/* and make len as that of session key only */
ses->auth_key.len = CIFS_SESS_KEY_SIZE;
out_free_cipher:
crypto_free_skcipher(tfm_arc4);
out:
kfree(sec_key);
return rc;
memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
kzfree(ctx_arc4);
return 0;
}
void

1
fs/cifs/cifsfs.c
View File

@ -1590,7 +1590,6 @@ MODULE_DESCRIPTION
("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
"also older servers complying with the SNIA CIFS Specification)");
MODULE_VERSION(CIFS_VERSION);
MODULE_SOFTDEP("pre: arc4");
MODULE_SOFTDEP("pre: des");
MODULE_SOFTDEP("pre: ecb");
MODULE_SOFTDEP("pre: hmac");