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Verify token signature in constant time, Run cheap checks first in token validation process (#1032)
* Verify token signature in constant time To prevent timing side channel attacks * Run cheap checks first in token validation process Expensive checks such as the nonce lookup on the database or the signature check can be run after cheap/fast checks.
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@ -1,3 +1,5 @@
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require "crypto/subtle"
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def generate_token(email, scopes, expire, key, db)
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session = "v1:#{Base64.urlsafe_encode(Random::Secure.random_bytes(32))}"
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PG_DB.exec("INSERT INTO session_ids VALUES ($1, $2, $3)", session, email, Time.utc)
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@ -76,14 +78,25 @@ def validate_request(token, session, request, key, db, locale = nil)
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raise translate(locale, "Hidden field \"token\" is a required field")
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end
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if token["signature"] != sign_token(key, token)
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raise translate(locale, "Invalid signature")
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expire = token["expire"]?.try &.as_i
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if expire.try &.< Time.utc.to_unix
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raise translate(locale, "Token is expired, please try again")
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end
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if token["session"] != session
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raise translate(locale, "Erroneous token")
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end
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scopes = token["scopes"].as_a.map { |v| v.as_s }
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scope = "#{request.method}:#{request.path.lchop("/api/v1/auth/").lstrip("/")}"
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if !scopes_include_scope(scopes, scope)
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raise translate(locale, "Invalid scope")
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end
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if !Crypto::Subtle.constant_time_compare(token["signature"].to_s, sign_token(key, token))
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raise translate(locale, "Invalid signature")
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end
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if token["nonce"]? && (nonce = db.query_one?("SELECT * FROM nonces WHERE nonce = $1", token["nonce"], as: {String, Time}))
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if nonce[1] > Time.utc
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db.exec("UPDATE nonces SET expire = $1 WHERE nonce = $2", Time.utc(1990, 1, 1), nonce[0])
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@ -92,18 +105,6 @@ def validate_request(token, session, request, key, db, locale = nil)
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end
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end
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scopes = token["scopes"].as_a.map { |v| v.as_s }
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scope = "#{request.method}:#{request.path.lchop("/api/v1/auth/").lstrip("/")}"
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if !scopes_include_scope(scopes, scope)
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raise translate(locale, "Invalid scope")
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end
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expire = token["expire"]?.try &.as_i
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if expire.try &.< Time.utc.to_unix
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raise translate(locale, "Token is expired, please try again")
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end
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return {scopes, expire, token["signature"].as_s}
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end
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