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| author | Eric Biggers <ebiggers@google.com> | 2018-01-03 11:16:30 -0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-12 23:03:39 +1100 |
| commit | d2dd68415e32ac6ce141461815a29a119b458ccd (patch) | |
| tree | 70f9000d39566aa384e47c0cd0ccee9977297455 /crypto/algif_aead.c | |
| parent | afef2cfab1cc0c1a6528fb266c6c609f5d028900 (diff) | |
| download | linux-crypto-d2dd68415e32ac6ce141461815a29a119b458ccd.tar.gz linux-crypto-d2dd68415e32ac6ce141461815a29a119b458ccd.zip | |
crypto: aead - prevent using AEADs without setting key
Similar to what was done for the hash API, update the AEAD API to track
whether each transform has been keyed, and reject encryption/decryption
if a key is needed but one hasn't been set.
This isn't quite as important as the equivalent fix for the hash API
because AEADs always require a key, so are unlikely to be used without
one. Still, tracking the key will prevent accidental unkeyed use.
algif_aead also had to track the key anyway, so the new flag replaces
that and slightly simplifies the algif_aead implementation.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algif_aead.c')
| -rw-r--r-- | crypto/algif_aead.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c index d963c8cf..4b07edd5 100644 --- a/crypto/algif_aead.c +++ b/crypto/algif_aead.c @@ -42,7 +42,6 @@ struct aead_tfm { struct crypto_aead *aead; - bool has_key; struct crypto_skcipher *null_tfm; }; @@ -398,7 +397,7 @@ static int aead_check_key(struct socket *sock) err = -ENOKEY; lock_sock_nested(psk, SINGLE_DEPTH_NESTING); - if (!tfm->has_key) + if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY) goto unlock; if (!pask->refcnt++) @@ -523,12 +522,8 @@ static int aead_setauthsize(void *private, unsigned int authsize) static int aead_setkey(void *private, const u8 *key, unsigned int keylen) { struct aead_tfm *tfm = private; - int err; - - err = crypto_aead_setkey(tfm->aead, key, keylen); - tfm->has_key = !err; - return err; + return crypto_aead_setkey(tfm->aead, key, keylen); } static void aead_sock_destruct(struct sock *sk) @@ -589,7 +584,7 @@ static int aead_accept_parent(void *private, struct sock *sk) { struct aead_tfm *tfm = private; - if (!tfm->has_key) + if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; return aead_accept_parent_nokey(private, sk); |