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auth-filters: do not use HMAC-SHA1

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Though SHA1 is broken, HMAC-SHA1 is still fine. But let's not push our
luck; SHA256 is more sensible anyway.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-07-14 03:32:00 +02:00
parent c132ef2462
commit c3b5b5f648
2 changed files with 4 additions and 4 deletions
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4
filters/gentoo-ldap-authentication.lua
View File

@ -271,7 +271,7 @@ function validate_value(expected_field, cookie)
end
-- Lua hashes strings, so these comparisons are time invariant.
if hmac ~= crypto.hmac.digest("sha1", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
return nil
end
@ -296,7 +296,7 @@ function secure_value(field, value, expiration)
value = url_encode(value)
field = url_encode(field)
authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret)
authstr = authstr .. "|" .. crypto.hmac.digest("sha256", authstr, secret)
return authstr
end

4
filters/simple-authentication.lua
View File

@ -231,7 +231,7 @@ function validate_value(expected_field, cookie)
end
-- Lua hashes strings, so these comparisons are time invariant.
if hmac ~= crypto.hmac.digest("sha1", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
return nil
end
@ -256,7 +256,7 @@ function secure_value(field, value, expiration)
value = url_encode(value)
field = url_encode(field)
authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret)
authstr = authstr .. "|" .. crypto.hmac.digest("sha256", authstr, secret)
return authstr
end