auth-filters: generate secret securely
This is much better than having the user generate it themselves. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tento commit je obsažen v:
Jason A. Donenfeld
rodič
c4d23d02ec
revize
b73df8098f
@ -5,7 +5,13 @@
|
||||
-- <http://mkottman.github.io/luacrypto/>
|
||||
-- lualdap >= 1.2
|
||||
-- <https://git.zx2c4.com/lualdap/about/>
|
||||
-- luaposix
|
||||
-- <https://github.com/luaposix/luaposix>
|
||||
--
|
||||
local sysstat = require("posix.sys.stat")
|
||||
local unistd = require("posix.unistd")
|
||||
local crypto = require("crypto")
|
||||
local lualdap = require("lualdap")
|
||||
|
||||
|
||||
--
|
||||
@ -21,11 +27,9 @@ local protected_repos = {
|
||||
portage = "dev"
|
||||
}
|
||||
|
||||
|
||||
-- All cookies will be authenticated based on this secret. Make it something
|
||||
-- totally random and impossible to guess. It should be large.
|
||||
local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
|
||||
|
||||
-- Set this to a path this script can write to for storing a persistent
|
||||
-- cookie secret, which should be guarded.
|
||||
local secret_filename = "/var/cache/cgit/auth-secret"
|
||||
|
||||
|
||||
--
|
||||
@ -102,8 +106,6 @@ end
|
||||
--
|
||||
--
|
||||
|
||||
local lualdap = require("lualdap")
|
||||
|
||||
function gentoo_ldap_user_groups(username, password)
|
||||
-- Ensure the user is alphanumeric
|
||||
if username == nil or username:match("%W") then
|
||||
@ -231,7 +233,38 @@ end
|
||||
--
|
||||
--
|
||||
|
||||
local crypto = require("crypto")
|
||||
local secret = nil
|
||||
|
||||
-- Loads a secret from a file, creates a secret, or returns one from memory.
|
||||
function get_secret()
|
||||
if secret ~= nil then
|
||||
return secret
|
||||
end
|
||||
local secret_file = io.open(secret_filename, "r")
|
||||
if secret_file == nil then
|
||||
local old_umask = sysstat.umask(63)
|
||||
local temporary_filename = secret_filename .. ".tmp." .. crypto.hex(crypto.rand.bytes(16))
|
||||
local temporary_file = io.open(temporary_filename, "w")
|
||||
if temporary_file == nil then
|
||||
os.exit(177)
|
||||
end
|
||||
temporary_file:write(crypto.hex(crypto.rand.bytes(32)))
|
||||
temporary_file:close()
|
||||
unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
|
||||
unistd.unlink(temporary_filename)
|
||||
sysstat.umask(old_umask)
|
||||
secret_file = io.open(secret_filename, "r")
|
||||
end
|
||||
if secret_file == nil then
|
||||
os.exit(177)
|
||||
end
|
||||
secret = secret_file:read()
|
||||
secret_file:close()
|
||||
if secret:len() ~= 64 then
|
||||
os.exit(177)
|
||||
end
|
||||
return secret
|
||||
end
|
||||
|
||||
-- Returns value of cookie if cookie is valid. Otherwise returns nil.
|
||||
function validate_value(expected_field, cookie)
|
||||
@ -271,7 +304,7 @@ function validate_value(expected_field, cookie)
|
||||
end
|
||||
|
||||
-- Lua hashes strings, so these comparisons are time invariant.
|
||||
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
|
||||
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, get_secret()) then
|
||||
return nil
|
||||
end
|
||||
|
||||
@ -296,7 +329,7 @@ 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("sha256", authstr, secret)
|
||||
authstr = authstr .. "|" .. crypto.hmac.digest("sha256", authstr, get_secret())
|
||||
return authstr
|
||||
end
|
||||
|
||||
|
||||
@ -3,7 +3,12 @@
|
||||
-- Requirements:
|
||||
-- luacrypto >= 0.3
|
||||
-- <http://mkottman.github.io/luacrypto/>
|
||||
-- luaposix
|
||||
-- <https://github.com/luaposix/luaposix>
|
||||
--
|
||||
local sysstat = require("posix.sys.stat")
|
||||
local unistd = require("posix.unistd")
|
||||
local crypto = require("crypto")
|
||||
|
||||
|
||||
--
|
||||
@ -31,11 +36,9 @@ local users = {
|
||||
bob = "ilikelua"
|
||||
}
|
||||
|
||||
-- All cookies will be authenticated based on this secret. Make it something
|
||||
-- totally random and impossible to guess. It should be large.
|
||||
local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
|
||||
|
||||
|
||||
-- Set this to a path this script can write to for storing a persistent
|
||||
-- cookie secret, which should be guarded.
|
||||
local secret_filename = "/var/cache/cgit/auth-secret"
|
||||
|
||||
--
|
||||
--
|
||||
@ -191,7 +194,38 @@ end
|
||||
--
|
||||
--
|
||||
|
||||
local crypto = require("crypto")
|
||||
local secret = nil
|
||||
|
||||
-- Loads a secret from a file, creates a secret, or returns one from memory.
|
||||
function get_secret()
|
||||
if secret ~= nil then
|
||||
return secret
|
||||
end
|
||||
local secret_file = io.open(secret_filename, "r")
|
||||
if secret_file == nil then
|
||||
local old_umask = sysstat.umask(63)
|
||||
local temporary_filename = secret_filename .. ".tmp." .. crypto.hex(crypto.rand.bytes(16))
|
||||
local temporary_file = io.open(temporary_filename, "w")
|
||||
if temporary_file == nil then
|
||||
os.exit(177)
|
||||
end
|
||||
temporary_file:write(crypto.hex(crypto.rand.bytes(32)))
|
||||
temporary_file:close()
|
||||
unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
|
||||
unistd.unlink(temporary_filename)
|
||||
sysstat.umask(old_umask)
|
||||
secret_file = io.open(secret_filename, "r")
|
||||
end
|
||||
if secret_file == nil then
|
||||
os.exit(177)
|
||||
end
|
||||
secret = secret_file:read()
|
||||
secret_file:close()
|
||||
if secret:len() ~= 64 then
|
||||
os.exit(177)
|
||||
end
|
||||
return secret
|
||||
end
|
||||
|
||||
-- Returns value of cookie if cookie is valid. Otherwise returns nil.
|
||||
function validate_value(expected_field, cookie)
|
||||
@ -231,7 +265,7 @@ function validate_value(expected_field, cookie)
|
||||
end
|
||||
|
||||
-- Lua hashes strings, so these comparisons are time invariant.
|
||||
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
|
||||
if hmac ~= crypto.hmac.digest("sha256", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, get_secret()) then
|
||||
return nil
|
||||
end
|
||||
|
||||
@ -256,7 +290,7 @@ 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("sha256", authstr, secret)
|
||||
authstr = authstr .. "|" .. crypto.hmac.digest("sha256", authstr, get_secret())
|
||||
return authstr
|
||||
end
|
||||
|
||||
|
||||
Načítá se…
Odkázat v novém úkolu
Zablokovat Uživatele