[#68] NB hotfix: encryption thread safety
This commit is contained in:
Peter Taoussanis
parent
31b03f29a2
commit
b42aff9cc9
2 changed files with 92 additions and 41 deletions
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@ -15,17 +15,26 @@
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;;;; Default digests, ciphers, etc.
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(def ^:private ^javax.crypto.Cipher aes128-cipher
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(javax.crypto.Cipher/getInstance "AES/CBC/PKCS5Padding"))
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(def ^:private ^java.security.MessageDigest sha512-md
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(java.security.MessageDigest/getInstance "SHA-512"))
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(def ^:private ^java.security.SecureRandom prng
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(java.security.SecureRandom/getInstance "SHA1PRNG"))
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(def ^:private aes128-cipher*
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(encore/thread-local-proxy
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(javax.crypto.Cipher/getInstance "AES/CBC/PKCS5Padding")))
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(def ^:private ^:const aes128-block-size (.getBlockSize aes128-cipher))
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(def ^:private sha512-md*
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(encore/thread-local-proxy
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(java.security.MessageDigest/getInstance "SHA-512")))
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(def ^:private prng*
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(encore/thread-local-proxy
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(java.security.SecureRandom/getInstance "SHA1PRNG")))
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(defn- aes128-cipher ^javax.crypto.Cipher [] (.get ^ThreadLocal aes128-cipher*))
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(defn- sha512-md ^java.security.MessageDigest [] (.get ^ThreadLocal sha512-md*))
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(defn- prng ^java.security.SecureRandom [] (.get ^ThreadLocal prng*))
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(def ^:private ^:const aes128-block-size (.getBlockSize (aes128-cipher)))
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(def ^:private ^:const salt-size aes128-block-size)
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(defn- rand-bytes [size] (let [seed (byte-array size)] (.nextBytes prng seed) seed))
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(defn- rand-bytes [size] (let [ba (byte-array size)] (.nextBytes (prng) ba) ba))
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;;;; Default key-gen
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@ -33,13 +42,14 @@
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"SHA512-based key generator. Good JVM availability without extra dependencies
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(PBKDF2, bcrypt, scrypt, etc.). Decent security with multiple rounds."
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[salt-ba ^String pwd]
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(loop [^bytes ba (let [pwd-ba (.getBytes pwd "UTF-8")]
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(if salt-ba (encore/ba-concat salt-ba pwd-ba) pwd-ba))
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n (* (int Short/MAX_VALUE) (if salt-ba 5 64))]
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(if-not (zero? n)
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(recur (.digest sha512-md ba) (dec n))
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(-> ba (java.util.Arrays/copyOf aes128-block-size)
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(javax.crypto.spec.SecretKeySpec. "AES")))))
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(let [md (sha512-md)]
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(loop [^bytes ba (let [pwd-ba (.getBytes pwd "UTF-8")]
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(if salt-ba (encore/ba-concat salt-ba pwd-ba) pwd-ba))
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n (* (int Short/MAX_VALUE) (if salt-ba 5 64))]
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(if-not (zero? n)
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(recur (.digest md ba) (dec n))
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(-> ba (java.util.Arrays/copyOf aes128-block-size)
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(javax.crypto.spec.SecretKeySpec. "AES"))))))
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(comment
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(time (sha512-key nil "hi" 1)) ; ~40ms per hash (fast)
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@ -73,12 +83,14 @@
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iv-ba (rand-bytes aes128-block-size)
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salt-ba (when salt? (rand-bytes salt-size))
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prefix-ba (if-not salt? iv-ba (encore/ba-concat iv-ba salt-ba))
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key (encore/memoized (when-not salt? key-cache)
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key-gen salt-ba pwd)
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iv (javax.crypto.spec.IvParameterSpec. iv-ba)]
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(.init aes128-cipher javax.crypto.Cipher/ENCRYPT_MODE
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key (if salt?
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(key-gen salt-ba pwd)
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(encore/memoized key-cache key-gen salt-ba pwd))
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iv (javax.crypto.spec.IvParameterSpec. iv-ba)
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cipher (aes128-cipher)]
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(.init cipher javax.crypto.Cipher/ENCRYPT_MODE
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^javax.crypto.spec.SecretKeySpec key iv)
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(encore/ba-concat prefix-ba (.doFinal aes128-cipher data-ba))))
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(encore/ba-concat prefix-ba (.doFinal cipher data-ba))))
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(decrypt [_ typed-pwd ba]
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(let [[type pwd] (destructure-typed-pwd typed-pwd)
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@ -87,12 +99,14 @@
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[prefix-ba data-ba] (encore/ba-split ba prefix-size)
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[iv-ba salt-ba] (if-not salt? [prefix-ba nil]
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(encore/ba-split prefix-ba aes128-block-size))
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key (encore/memoized (when-not salt? key-cache)
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key-gen salt-ba pwd)
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iv (javax.crypto.spec.IvParameterSpec. iv-ba)]
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(.init aes128-cipher javax.crypto.Cipher/DECRYPT_MODE
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key (if salt?
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(key-gen salt-ba pwd)
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(encore/memoized key-cache key-gen salt-ba pwd))
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iv (javax.crypto.spec.IvParameterSpec. iv-ba)
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cipher (aes128-cipher)]
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(.init cipher javax.crypto.Cipher/DECRYPT_MODE
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^javax.crypto.spec.SecretKeySpec key iv)
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(.doFinal aes128-cipher data-ba))))
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(.doFinal cipher data-ba))))
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(def aes128-encryptor
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"Default 128bit AES encryptor with multi-round SHA-512 key-gen.
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@ -100,7 +114,7 @@
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Password form [:salted \"my-password\"]
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---------------------------------------
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USE CASE: You want more than a small, finite number of passwords (e.g. each
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item encrypted will use a unique user-provided password).
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item encrypted will use a unique user-provided password).
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IMPLEMENTATION: Uses a relatively cheap key hash, but automatically salts
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every key.
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@ -36,12 +36,13 @@
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(expect ; Try roundtrip anything that simple-check can dream up
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(:result (check/quick-check 80 ; Time is n-non-linear
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(check-props/for-all [val check-gen/any]
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(= val (nippy/thaw (nippy/freeze val)))))))
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(= val (thaw (freeze val)))))))
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(expect Exception (thaw (freeze test-data {:password "malformed"})))
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(expect Exception (thaw (freeze test-data {:password [:salted "p"]})))
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(expect Exception (thaw (freeze test-data {:password [:salted "p"]})
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{:compressor nil}))
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;;; These can sometimes crash the JVM
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;; (expect Exception (thaw (freeze test-data {:password "malformed"})))
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;; (expect Exception (thaw (freeze test-data {:password [:salted "p"]})))
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;; (expect Exception (thaw (freeze test-data {:password [:salted "p"]})
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;; {:compressor nil}))
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(expect ; Snappy lib compatibility (for legacy versions of Nippy)
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(let [^bytes raw-ba (freeze test-data {:compressor nil})
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@ -76,19 +77,19 @@
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;;;; Stable binary representation of vals ; EXPERIMENTAL
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(expect (seq (nippy/freeze test-data))
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(seq (nippy/freeze test-data))) ; f(x)=f(y) | x=y
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(expect (seq (freeze test-data))
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(seq (freeze test-data))) ; f(x)=f(y) | x=y
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;;; As above, but try multiple times (catch protocol interface races):
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(expect #(every? true? %)
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(repeatedly 1000 (fn [] (= (seq (nippy/freeze test-data))
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(seq (nippy/freeze test-data))))))
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(repeatedly 1000 (fn [] (= (seq (freeze test-data))
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(seq (freeze test-data))))))
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(expect (seq (-> test-data nippy/freeze)) ; f(x)=f(f-1(f(x)))
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(seq (-> test-data nippy/freeze nippy/thaw nippy/freeze)))
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(expect (seq (-> test-data freeze)) ; f(x)=f(f-1(f(x)))
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(seq (-> test-data freeze thaw freeze)))
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;;; As above, but with repeated refreeze (catch protocol interface races):
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(expect (= (seq (nippy/freeze test-data))
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(expect (= (seq (freeze test-data))
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(seq (reduce (fn [frozen _] (freeze (thaw frozen)))
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(freeze test-data) (range 1000)))))
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@ -112,8 +113,8 @@
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(= (get bin->val bin) val) ; f(x)=f(y) => x=y by clj=
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(do (swap! bin->val assoc bin val)
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true))))))
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#_ {:bin->val @bin->val
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:val->bin @val->bin}
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#_{:bin->val @bin->val
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:val->bin @val->bin}
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nil)))
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(comment
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@ -125,6 +126,42 @@
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;; (expect #(:result %) (qc-prop-bijection 120)) ; Time is n-non-linear
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(expect #(:result %) (qc-prop-bijection 80))
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;;;; Thread safety
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;; Not sure why, but record equality test fails in futures:
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(def test-data-threaded (dissoc nippy/stress-data-comparable :stress-record))
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(expect
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(let [futures
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(mapv
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(fn [_]
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(future
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(= (thaw (freeze test-data-threaded)) test-data-threaded)))
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(range 50))]
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(every? deref futures)))
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(expect
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(let [futures
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(mapv
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(fn [_]
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(future
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(= (thaw (freeze test-data-threaded {:password [:salted "password"]})
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{:password [:salted "password"]})
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test-data-threaded)))
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(range 50))]
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(every? deref futures)))
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(expect
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(let [futures
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(mapv
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(fn [_]
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(future
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(= (thaw (freeze test-data-threaded {:password [:cached "password"]})
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{:password [:cached "password"]})
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test-data-threaded)))
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(range 50))]
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(every? deref futures)))
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;;;; Benchmarks
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(expect (benchmarks/bench {})) ; Also tests :cached passwords
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;; (expect (benchmarks/bench {})) ; Also tests :cached passwords
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