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>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[bwh: Backported to 3.2:
 - In hash_accept_parent_nokey(), update initialisation of ds to use tfm
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 6f89231..555c5e5 100644 (file)
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -172,11 +172,18 @@ int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
                        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);
+
+       if (err)
+               return err;
 
-       return tfm->setkey(tfm, key, keylen);
+       crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+       return 0;
 }
 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
 
@@ -349,7 +356,12 @@ EXPORT_SYMBOL_GPL(crypto_ahash_finup);
 
 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);
 
@@ -435,7 +447,6 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
        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;
 
@@ -450,7 +461,8 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 
        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 d11d431..3aa8890 100644 (file)
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -34,11 +34,6 @@ struct hash_ctx {
        struct ahash_request req;
 };
 
-struct algif_hash_tfm {
-       struct crypto_ahash *hash;
-       bool has_key;
-};
-
 static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
                        struct msghdr *msg, size_t ignored)
 {
@@ -258,7 +253,7 @@ static int hash_check_key(struct socket *sock)
        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);
 
@@ -272,7 +267,7 @@ static int hash_check_key(struct socket *sock)
 
        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++)
@@ -363,41 +358,17 @@ static struct proto_ops algif_hash_ops_nokey = {
 
 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)
@@ -413,12 +384,11 @@ static void hash_sock_destruct(struct sock *sk)
 
 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);
-       unsigned ds = crypto_ahash_digestsize(hash);
+       struct hash_ctx *ctx;
+       unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
+       unsigned ds = crypto_ahash_digestsize(tfm);
 
        ctx = sock_kmalloc(sk, len, GFP_KERNEL);
        if (!ctx)
@@ -438,7 +408,7 @@ static int hash_accept_parent_nokey(void *private, struct sock *sk)
 
        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);
 
@@ -449,9 +419,9 @@ static int hash_accept_parent_nokey(void *private, struct sock *sk)
 
 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 0d66c2e..5441f4e 100644 (file)
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -57,11 +57,18 @@ int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 {
        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);
+
+       if (err)
+               return err;
 
-       return shash->setkey(tfm, key, keylen);
+       crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+       return 0;
 }
 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 
@@ -179,6 +186,9 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
        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);
 
@@ -358,7 +368,8 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
        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;
@@ -518,8 +529,14 @@ static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
 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 = 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);
 
-       hash->descsize = crypto_shash_alg(hash)->descsize;
        return 0;
 }
 

diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index c8c7987..9fa0f77 100644 (file)
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -94,7 +94,6 @@ struct crypto_ahash {
                      unsigned int keylen);
 
        unsigned int reqsize;
-       bool has_setkey;
        struct crypto_tfm base;
 };
 
@@ -182,11 +181,6 @@ static inline void *ahash_request_ctx(struct ahash_request *req)
 
 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;
-}
-
 int crypto_ahash_finup(struct ahash_request *req);
 int crypto_ahash_final(struct ahash_request *req);
 int crypto_ahash_digest(struct ahash_request *req);
@@ -198,12 +192,22 @@ static inline int crypto_ahash_export(struct ahash_request *req, void *out)
 
 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);
 }
 
 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);
 }
 
 static inline int crypto_ahash_update(struct ahash_request *req)
@@ -342,12 +346,22 @@ static inline int crypto_shash_export(struct shash_desc *desc, void *out)
 
 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);
 }
 
 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);
 }
 
 int crypto_shash_update(struct shash_desc *desc, const u8 *data,

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index b5f3191..5c511ba 100644 (file)
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -97,6 +97,8 @@
 /*
  * 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