crypto: hash - prevent using keyed hashes without setting key
commit 9fa68f620041be04720d0cbfb1bd3ddfc6310b24 upstream.
Currently, almost none of the keyed hash algorithms check whether a key
has been set before proceeding. Some algorithms are okay with this and
will effectively just use a key of all 0's or some other bogus default.
However, others will severely break, as demonstrated using
"hmac(sha3-512-generic)", the unkeyed use of which causes a kernel crash
via a (potentially exploitable) stack buffer overflow.
A while ago, this problem was solved for AF_ALG by pairing each hash
transform with a 'has_key' bool. However, there are still other places
in the kernel where userspace can specify an arbitrary hash algorithm by
name, and the kernel uses it as unkeyed hash without checking whether it
is really unkeyed. Examples of this include:
- KEYCTL_DH_COMPUTE, via the KDF extension
- dm-verity
- dm-crypt, via the ESSIV support
- dm-integrity, via the "internal hash" mode with no key given
- drbd (Distributed Replicated Block Device)
This bug is especially bad for KEYCTL_DH_COMPUTE as that requires no
privileges to call.
Fix the bug for all users by adding a flag CRYPTO_TFM_NEED_KEY to the
->crt_flags of each hash transform that indicates whether the transform
still needs to be keyed or not. Then, make the hash init, import, and
digest functions return -ENOKEY if the key is still needed.
The new flag also replaces the 'has_key' bool which algif_hash was
previously using, thereby simplifying the algif_hash implementation.
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/crypto/ahash.c b/crypto/ahash.c
index f3fa104..14402ef 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -192,11 +192,18 @@
unsigned int keylen)
{
unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ int err;
if ((unsigned long)key & alignmask)
- return ahash_setkey_unaligned(tfm, key, keylen);
+ err = ahash_setkey_unaligned(tfm, key, keylen);
+ else
+ err = tfm->setkey(tfm, key, keylen);
- return tfm->setkey(tfm, key, keylen);
+ if (err)
+ return err;
+
+ crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return 0;
}
EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
@@ -369,7 +376,12 @@
int crypto_ahash_digest(struct ahash_request *req)
{
- return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return crypto_ahash_op(req, tfm->digest);
}
EXPORT_SYMBOL_GPL(crypto_ahash_digest);
@@ -455,7 +467,6 @@
struct ahash_alg *alg = crypto_ahash_alg(hash);
hash->setkey = ahash_nosetkey;
- hash->has_setkey = false;
hash->export = ahash_no_export;
hash->import = ahash_no_import;
@@ -470,7 +481,8 @@
if (alg->setkey) {
hash->setkey = alg->setkey;
- hash->has_setkey = true;
+ if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
+ crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
}
if (alg->export)
hash->export = alg->export;
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 54fc90e..731b5fb 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -34,11 +34,6 @@
struct ahash_request req;
};
-struct algif_hash_tfm {
- struct crypto_ahash *hash;
- bool has_key;
-};
-
static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
{
unsigned ds;
@@ -308,7 +303,7 @@
int err = 0;
struct sock *psk;
struct alg_sock *pask;
- struct algif_hash_tfm *tfm;
+ struct crypto_ahash *tfm;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
@@ -322,7 +317,7 @@
err = -ENOKEY;
lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
- if (!tfm->has_key)
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
goto unlock;
if (!pask->refcnt++)
@@ -413,41 +408,17 @@
static void *hash_bind(const char *name, u32 type, u32 mask)
{
- struct algif_hash_tfm *tfm;
- struct crypto_ahash *hash;
-
- tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
- if (!tfm)
- return ERR_PTR(-ENOMEM);
-
- hash = crypto_alloc_ahash(name, type, mask);
- if (IS_ERR(hash)) {
- kfree(tfm);
- return ERR_CAST(hash);
- }
-
- tfm->hash = hash;
-
- return tfm;
+ return crypto_alloc_ahash(name, type, mask);
}
static void hash_release(void *private)
{
- struct algif_hash_tfm *tfm = private;
-
- crypto_free_ahash(tfm->hash);
- kfree(tfm);
+ crypto_free_ahash(private);
}
static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
{
- struct algif_hash_tfm *tfm = private;
- int err;
-
- err = crypto_ahash_setkey(tfm->hash, key, keylen);
- tfm->has_key = !err;
-
- return err;
+ return crypto_ahash_setkey(private, key, keylen);
}
static void hash_sock_destruct(struct sock *sk)
@@ -462,11 +433,10 @@
static int hash_accept_parent_nokey(void *private, struct sock *sk)
{
- struct hash_ctx *ctx;
+ struct crypto_ahash *tfm = private;
struct alg_sock *ask = alg_sk(sk);
- struct algif_hash_tfm *tfm = private;
- struct crypto_ahash *hash = tfm->hash;
- unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
+ struct hash_ctx *ctx;
+ unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
@@ -479,7 +449,7 @@
ask->private = ctx;
- ahash_request_set_tfm(&ctx->req, hash);
+ ahash_request_set_tfm(&ctx->req, tfm);
ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
af_alg_complete, &ctx->completion);
@@ -490,9 +460,9 @@
static int hash_accept_parent(void *private, struct sock *sk)
{
- struct algif_hash_tfm *tfm = private;
+ struct crypto_ahash *tfm = private;
- if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
return -ENOKEY;
return hash_accept_parent_nokey(private, sk);
diff --git a/crypto/shash.c b/crypto/shash.c
index 9bd5044..d5bd2f0 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -57,11 +57,18 @@
{
struct shash_alg *shash = crypto_shash_alg(tfm);
unsigned long alignmask = crypto_shash_alignmask(tfm);
+ int err;
if ((unsigned long)key & alignmask)
- return shash_setkey_unaligned(tfm, key, keylen);
+ err = shash_setkey_unaligned(tfm, key, keylen);
+ else
+ err = shash->setkey(tfm, key, keylen);
- return shash->setkey(tfm, key, keylen);
+ if (err)
+ return err;
+
+ crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);
@@ -180,6 +187,9 @@
struct shash_alg *shash = crypto_shash_alg(tfm);
unsigned long alignmask = crypto_shash_alignmask(tfm);
+ if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
if (((unsigned long)data | (unsigned long)out) & alignmask)
return shash_digest_unaligned(desc, data, len, out);
@@ -359,7 +369,8 @@
crt->digest = shash_async_digest;
crt->setkey = shash_async_setkey;
- crt->has_setkey = alg->setkey != shash_no_setkey;
+ crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
+ CRYPTO_TFM_NEED_KEY);
if (alg->export)
crt->export = shash_async_export;
@@ -374,8 +385,14 @@
static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_shash *hash = __crypto_shash_cast(tfm);
+ struct shash_alg *alg = crypto_shash_alg(hash);
- hash->descsize = crypto_shash_alg(hash)->descsize;
+ hash->descsize = alg->descsize;
+
+ if (crypto_shash_alg_has_setkey(alg) &&
+ !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
+ crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
+
return 0;
}
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 2660588..d3de3b8 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -205,7 +205,6 @@
unsigned int keylen);
unsigned int reqsize;
- bool has_setkey;
struct crypto_tfm base;
};
@@ -399,11 +398,6 @@
int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen);
-static inline bool crypto_ahash_has_setkey(struct crypto_ahash *tfm)
-{
- return tfm->has_setkey;
-}
-
/**
* crypto_ahash_finup() - update and finalize message digest
* @req: reference to the ahash_request handle that holds all information
@@ -475,7 +469,12 @@
*/
static inline int crypto_ahash_import(struct ahash_request *req, const void *in)
{
- return crypto_ahash_reqtfm(req)->import(req, in);
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return tfm->import(req, in);
}
/**
@@ -492,7 +491,12 @@
*/
static inline int crypto_ahash_init(struct ahash_request *req)
{
- return crypto_ahash_reqtfm(req)->init(req);
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return tfm->init(req);
}
/**
@@ -845,7 +849,12 @@
*/
static inline int crypto_shash_import(struct shash_desc *desc, const void *in)
{
- return crypto_shash_alg(desc->tfm)->import(desc, in);
+ struct crypto_shash *tfm = desc->tfm;
+
+ if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return crypto_shash_alg(tfm)->import(desc, in);
}
/**
@@ -861,7 +870,12 @@
*/
static inline int crypto_shash_init(struct shash_desc *desc)
{
- return crypto_shash_alg(desc->tfm)->init(desc);
+ struct crypto_shash *tfm = desc->tfm;
+
+ if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return crypto_shash_alg(tfm)->init(desc);
}
/**
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index b0175fa..8edb3ba 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -111,6 +111,8 @@
/*
* Transform masks and values (for crt_flags).
*/
+#define CRYPTO_TFM_NEED_KEY 0x00000001
+
#define CRYPTO_TFM_REQ_MASK 0x000fff00
#define CRYPTO_TFM_RES_MASK 0xfff00000