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|
--[[
Copyright (c) 2020, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]] --
local rspamd_logger = require "rspamd_logger"
local lua_util = require "lua_util"
local dkim_sign_tools = require "lua_dkim_tools"
local rspamd_util = require "rspamd_util"
local rspamd_rsa_privkey = require "rspamd_rsa_privkey"
local rspamd_rsa = require "rspamd_rsa"
local fun = require "fun"
local auth_results = require "lua_auth_results"
local hash = require "rspamd_cryptobox_hash"
local lua_mime = require "lua_mime"
if confighelp then
return
end
local N = 'arc'
if not rspamd_plugins.dkim then
rspamd_logger.errx(rspamd_config, "cannot enable arc plugin: dkim is disabled")
return
end
local dkim_verify = rspamd_plugins.dkim.verify
local dkim_sign = rspamd_plugins.dkim.sign
local dkim_canonicalize = rspamd_plugins.dkim.canon_header_relaxed
local redis_params
if not dkim_verify or not dkim_sign or not dkim_canonicalize then
rspamd_logger.errx(rspamd_config, "cannot enable arc plugin: dkim is disabled")
return
end
local arc_symbols = {
allow = 'ARC_ALLOW',
invalid = 'ARC_INVALID',
dnsfail = 'ARC_DNSFAIL',
na = 'ARC_NA',
reject = 'ARC_REJECT',
}
local settings = {
allow_envfrom_empty = true,
allow_hdrfrom_mismatch = false,
allow_hdrfrom_mismatch_local = false,
allow_hdrfrom_mismatch_sign_networks = false,
allow_hdrfrom_multiple = false,
allow_username_mismatch = false,
sign_authenticated = true,
domain = {},
path = string.format('%s/%s/%s', rspamd_paths['DBDIR'], 'arc', '$domain.$selector.key'),
sign_local = true,
selector = 'arc',
sign_symbol = 'ARC_SIGNED',
try_fallback = true,
use_domain = 'header',
use_esld = true,
use_redis = false,
key_prefix = 'arc_keys', -- default hash name
reuse_auth_results = false, -- Reuse the existing authentication results
whitelisted_signers_map = nil, -- Trusted signers domains
allowed_ids = nil, -- Allowed settings id
forbidden_ids = nil, -- Banned settings id
}
-- To match normal AR
local ar_settings = auth_results.default_settings
local function parse_arc_header(hdr, target)
-- Split elements by ';' and trim spaces
local arr = fun.totable(fun.map(
function(val)
return fun.totable(fun.map(lua_util.rspamd_str_trim,
fun.filter(function(v) return v and #v > 0 end,
lua_util.rspamd_str_split(val.decoded, ';'))))
end, hdr
))
-- Now we have two tables in format:
-- [sigs] -> [{sig1_elts}, {sig2_elts}...]
for i,elts in ipairs(arr) do
if not target[i] then target[i] = {} end
-- Split by kv pair, like k=v
fun.each(function(v)
if v[1] and v[2] then
target[i][v[1]] = v[2]
end
end, fun.map(function(elt)
return lua_util.rspamd_str_split(elt, '=')
end, elts))
target[i].header = hdr[i].decoded
target[i].raw_header = hdr[i].value
end
-- sort by i= attribute
table.sort(target, function(a, b)
return (a.i or 0) < (b.i or 0)
end)
end
local function arc_validate_seals(task, seals, sigs, seal_headers, sig_headers)
local fail_reason
for i = 1,#seals do
if (sigs[i].i or 0) ~= i then
fail_reason = string.format('bad i for signature: %d, expected %d; d=%s',
sigs[i].i, i, sigs[i].d)
rspamd_logger.infox(task, fail_reason)
task:insert_result(arc_symbols['invalid'], 1.0, fail_reason)
return false,fail_reason
end
if (seals[i].i or 0) ~= i then
fail_reason = string.format('bad i for seal: %d, expected %d; d=%s',
seals[i].i, i, seals[i].d)
rspamd_logger.infox(task, fail_reason)
task:insert_result(arc_symbols['invalid'], 1.0,fail_reason)
return false,fail_reason
end
if not seals[i].cv then
fail_reason = string.format('no cv on i=%d', i)
task:insert_result(arc_symbols['invalid'], 1.0, fail_reason)
return false,fail_reason
end
if i == 1 then
-- We need to ensure that cv of seal is equal to 'none'
if seals[i].cv ~= 'none' then
fail_reason = 'cv is not "none" for i=1'
task:insert_result(arc_symbols['invalid'], 1.0, fail_reason)
return false,fail_reason
end
else
if seals[i].cv ~= 'pass' then
fail_reason = string.format('cv is %s on i=%d', seals[i].cv, i)
task:insert_result(arc_symbols['reject'], 1.0, fail_reason)
return true,fail_reason
end
end
end
return true,nil
end
local function arc_callback(task)
local arc_sig_headers = task:get_header_full('ARC-Message-Signature')
local arc_seal_headers = task:get_header_full('ARC-Seal')
if not arc_sig_headers or not arc_seal_headers then
task:insert_result(arc_symbols['na'], 1.0)
return
end
if #arc_sig_headers ~= #arc_seal_headers then
-- We mandate that count of seals is equal to count of signatures
rspamd_logger.infox(task, 'number of seals (%s) is not equal to number of signatures (%s)',
#arc_seal_headers, #arc_sig_headers)
task:insert_result(arc_symbols['invalid'], 1.0, 'invalid count of seals and signatures')
return
end
local cbdata = {
seals = {},
sigs = {},
cur_arc_id = 0,
res = 'success',
errors = {},
allowed_by_trusted = false
}
parse_arc_header(arc_seal_headers, cbdata.seals)
parse_arc_header(arc_sig_headers, cbdata.sigs)
-- Fix i type
fun.each(function(hdr)
hdr.i = tonumber(hdr.i) or 0
end, cbdata.seals)
fun.each(function(hdr)
hdr.i = tonumber(hdr.i) or 0
end, cbdata.sigs)
-- Now we need to sort elements according to their [i] value
table.sort(cbdata.seals, function(e1, e2)
return (e1.i or 0) < (e2.i or 0)
end)
table.sort(cbdata.sigs, function(e1, e2)
return (e1.i or 0) < (e2.i or 0)
end)
lua_util.debugm(N, task, 'got %s arc sections', #cbdata.seals)
-- Now check sanity of what we have
local valid,validation_error = arc_validate_seals(task, cbdata.seals, cbdata.sigs,
arc_seal_headers, arc_sig_headers)
if not valid then
task:cache_set('arc-failure', validation_error)
return
end
task:cache_set('arc-sigs', cbdata.sigs)
task:cache_set('arc-seals', cbdata.seals)
if validation_error then
-- ARC rejection but no strong failure for signing
return
end
local function gen_arc_seal_cb(sig)
return function (_, res, err, domain)
cbdata.cur_arc_id = cbdata.cur_arc_id + 1
lua_util.debugm(N, task, 'checked arc seal: %s(%s), %s processed',
res, err, cbdata.cur_arc_id)
if not res then
cbdata.res = 'fail'
if err and domain then
table.insert(cbdata.errors, string.format('sig:%s:%s', domain, err))
end
end
if settings.whitelisted_signers_map and cbdata.res == 'success' then
if settings.whitelisted_signers_map:get_key(sig.d) then
-- Whitelisted signer has been found in a valid chain
task:insert_result(arc_symbols.trusted_allow, 1.0,
string.format('%s:s=%s:i=%d', domain, sig.s, cbdata.cur_arc_id))
end
end
if cbdata.cur_arc_id == #arc_sig_headers then
if cbdata.res == 'success' then
local arc_allow_result = string.format('%s:s=%s:i=%d',
domain, sig.s, cbdata.cur_arc_id)
task:insert_result(arc_symbols.allow, 1.0, arc_allow_result)
task:cache_set('arc-allow', arc_allow_result)
else
task:insert_result(arc_symbols.reject, 1.0,
rspamd_logger.slog('seal check failed: %s, %s', cbdata.res,
cbdata.errors))
end
end
end
end
local function arc_signature_cb(_, res, err, domain)
lua_util.debugm(N, task, 'checked arc signature %s: %s(%s), %s processed',
domain, res, err, cbdata.cur_arc_id)
if not res then
cbdata.res = 'fail'
if err and domain then
table.insert(cbdata.errors, string.format('sig:%s:%s', domain, err))
end
end
if cbdata.res == 'success' then
-- Verify seals
cbdata.cur_arc_id = 0
fun.each(
function(sig)
local ret, lerr = dkim_verify(task, sig.header, gen_arc_seal_cb(sig), 'arc-seal')
if not ret then
cbdata.res = 'fail'
table.insert(cbdata.errors, string.format('seal:%s:s=%s:i=%s:%s',
sig.d or '', sig.s or '', sig.i or '', lerr))
cbdata.cur_arc_id = cbdata.cur_arc_id + 1
lua_util.debugm(N, task, 'checked arc seal %s: %s(%s), %s processed',
sig.d, ret, lerr, cbdata.cur_arc_id)
end
end, cbdata.seals)
else
task:insert_result(arc_symbols['reject'], 1.0,
rspamd_logger.slog('signature check failed: %s, %s', cbdata.res,
cbdata.errors))
end
end
--[[
1. Collect all ARC Sets currently attached to the message. If there
are none, the Chain Validation Status is "none" and the algorithm
stops here. The maximum number of ARC Sets that can be attached
to a message is 50. If more than the maximum number exist the
Chain Validation Status is "fail" and the algorithm stops here.
In the following algorithm, the maximum ARC instance value is
referred to as "N".
2. If the Chain Validation Status of the highest instance value ARC
Set is "fail", then the Chain Validation status is "fail" and the
algorithm stops here.
3. Validate the structure of the Authenticated Received Chain. A
valid ARC has the following conditions:
1. Each ARC Set MUST contain exactly one each of the three ARC
header fields (AAR, AMS, and AS).
2. The instance values of the ARC Sets MUST form a continuous
sequence from 1..N with no gaps or repetition.
3. The "cv" value for all ARC-Seal header fields must be non-
failing. For instance values > 1, the value must be "pass".
For instance value = 1, the value must be "none".
* If any of these conditions are not met, the Chain Validation
Status is "fail" and the algorithm stops here.
4. Validate the AMS with the greatest instance value (most recent).
If validation fails, then the Chain Validation Status is "fail"
and the algorithm stops here.
5 - 7. Optional, not implemented
8. Validate each AS beginning with the greatest instance value and
proceeding in decreasing order to the AS with the instance value
of 1. If any AS fails to validate, the Chain Validation Status
is "fail" and the algorithm stops here.
9. If the algorithm reaches this step, then the Chain Validation
Status is "pass", and the algorithm is complete.
]]--
local processed = 0
local sig = cbdata.sigs[#cbdata.sigs] -- last AMS
local ret,err = dkim_verify(task, sig.header, arc_signature_cb, 'arc-sign')
if not ret then
cbdata.res = 'fail'
table.insert(cbdata.errors, string.format('sig:%s:%s', sig.d or '', err))
else
processed = processed + 1
lua_util.debugm(N, task, 'processed arc signature %s[%s]: %s(%s), %s processed',
sig.d, sig.i, ret, err, cbdata.cur_arc_id)
end
if processed == 0 then
task:insert_result(arc_symbols['reject'], 1.0,
rspamd_logger.slog('cannot verify %s of %s signatures: %s',
#arc_sig_headers - processed, #arc_sig_headers, cbdata.errors))
end
end
local opts = rspamd_config:get_all_opt('arc')
if not opts or type(opts) ~= 'table' then
return
end
if opts['symbols'] then
for k,_ in pairs(arc_symbols) do
if opts['symbols'][k] then
arc_symbols[k] = opts['symbols'][k]
end
end
end
local id = rspamd_config:register_symbol({
name = 'ARC_CALLBACK',
type = 'callback',
group = 'policies',
groups = {'arc'},
callback = arc_callback
})
rspamd_config:register_symbol({
name = arc_symbols['allow'],
parent = id,
type = 'virtual',
score = -1.0,
group = 'policies',
groups = {'arc'},
})
rspamd_config:register_symbol({
name = arc_symbols['reject'],
parent = id,
type = 'virtual',
score = 2.0,
group = 'policies',
groups = {'arc'},
})
rspamd_config:register_symbol({
name = arc_symbols['invalid'],
parent = id,
type = 'virtual',
score = 1.0,
group = 'policies',
groups = {'arc'},
})
rspamd_config:register_symbol({
name = arc_symbols['dnsfail'],
parent = id,
type = 'virtual',
score = 0.0,
group = 'policies',
groups = {'arc'},
})
rspamd_config:register_symbol({
name = arc_symbols['na'],
parent = id,
type = 'virtual',
score = 0.0,
group = 'policies',
groups = {'arc'},
})
rspamd_config:register_dependency('ARC_CALLBACK', 'SPF_CHECK')
rspamd_config:register_dependency('ARC_CALLBACK', 'DKIM_CHECK')
local function arc_sign_seal(task, params, header)
local arc_sigs = task:cache_get('arc-sigs')
local arc_seals = task:cache_get('arc-seals')
local arc_auth_results = task:get_header_full('ARC-Authentication-Results') or {}
local cur_auth_results
local privkey
if params.rawkey then
-- Distinguish between pem and base64
if string.match(params.rawkey, '^-----BEGIN') then
privkey = rspamd_rsa_privkey.load_pem(params.rawkey)
else
privkey = rspamd_rsa_privkey.load_base64(params.rawkey)
end
elseif params.key then
privkey = rspamd_rsa_privkey.load_file(params.key)
end
if not privkey then
rspamd_logger.errx(task, 'cannot load private key for signing')
return
end
if settings.reuse_auth_results then
local ar_header = task:get_header('Authentication-Results')
if ar_header then
rspamd_logger.debugm(N, task, 'reuse authentication results header for ARC')
cur_auth_results = ar_header
else
rspamd_logger.debugm(N, task, 'cannot reuse authentication results, header is missing')
cur_auth_results = auth_results.gen_auth_results(task, ar_settings) or ''
end
else
cur_auth_results = auth_results.gen_auth_results(task, ar_settings) or ''
end
local sha_ctx = hash.create_specific('sha256')
-- Update using previous seals + sigs + AAR
local cur_idx = 1
if arc_seals then
cur_idx = #arc_seals + 1
for i = (cur_idx - 1), 1, (-1) do
if arc_auth_results[i] then
local s = dkim_canonicalize('ARC-Authentication-Results',
arc_auth_results[i].value)
sha_ctx:update(s)
lua_util.debugm(N, task, 'update signature with header: %s', s)
end
if arc_sigs[i] then
local s = dkim_canonicalize('ARC-Message-Signature',
arc_sigs[i].raw_header)
sha_ctx:update(s)
lua_util.debugm(N, task, 'update signature with header: %s', s)
end
if arc_seals[i] then
local s = dkim_canonicalize('ARC-Seal', arc_seals[i].raw_header)
sha_ctx:update(s)
lua_util.debugm(N, task, 'update signature with header: %s', s)
end
end
end
header = lua_util.fold_header(task,
'ARC-Message-Signature',
header)
cur_auth_results = string.format('i=%d; %s', cur_idx, cur_auth_results)
cur_auth_results = lua_util.fold_header(task,
'ARC-Authentication-Results',
cur_auth_results, ';')
local s = dkim_canonicalize('ARC-Authentication-Results',
cur_auth_results)
sha_ctx:update(s)
lua_util.debugm(N, task, 'update signature with header: %s', s)
s = dkim_canonicalize('ARC-Message-Signature', header)
sha_ctx:update(s)
lua_util.debugm(N, task, 'update signature with header: %s', s)
local cur_arc_seal = string.format('i=%d; s=%s; d=%s; t=%d; a=rsa-sha256; cv=%s; b=',
cur_idx,
params.selector,
params.domain,
math.floor(rspamd_util.get_time()), params.arc_cv)
s = string.format('%s:%s', 'arc-seal', cur_arc_seal)
sha_ctx:update(s)
lua_util.debugm(N, task, 'initial update signature with header: %s', s)
local nl_type
if task:has_flag("milter") then
nl_type = "lf"
else
nl_type = task:get_newlines_type()
end
local sig = rspamd_rsa.sign_memory(privkey, sha_ctx:bin())
cur_arc_seal = string.format('%s%s', cur_arc_seal,
sig:base64(70, nl_type))
lua_mime.modify_headers(task, {
add = {
['ARC-Authentication-Results'] = {order = 1, value = cur_auth_results},
['ARC-Message-Signature'] = {order = 1, value = header},
['ARC-Seal'] = {order = 1, value = lua_util.fold_header(task,
'ARC-Seal', cur_arc_seal) }
},
-- RFC requires a strict order for these headers to be inserted
order = {'ARC-Authentication-Results', 'ARC-Message-Signature', 'ARC-Seal'},
})
task:insert_result(settings.sign_symbol, 1.0,
string.format('%s:s=%s:i=%d', params.domain, params.selector, cur_idx))
end
local function prepare_arc_selector(task, sel)
local arc_seals = task:cache_get('arc-seals')
if not arc_seals then
-- Check if our arc is broken
local failure_reason = task:cache_get('arc-failure')
if failure_reason then
rspamd_logger.infox(task, 'skip ARC as the existing chain is broken: %s', failure_reason)
return false
end
end
sel.arc_cv = 'none'
sel.arc_idx = 1
sel.no_cache = true
sel.sign_type = 'arc-sign'
if arc_seals then
sel.arc_idx = #arc_seals + 1
local function default_arc_cv()
if task:cache_get('arc-allow') then
sel.arc_cv = 'pass'
else
sel.arc_cv = 'fail'
end
end
if settings.reuse_auth_results then
local ar_header = task:get_header('Authentication-Results')
if ar_header then
local arc_match = string.match(ar_header, 'arc=(%w+)')
if arc_match then
if arc_match == 'none' or arc_match == 'pass' then
-- none should be converted to `pass`
sel.arc_cv = 'pass'
else
sel.arc_cv = 'fail'
end
else
default_arc_cv()
end
else
-- Cannot reuse, use normal path
default_arc_cv()
end
else
default_arc_cv()
end
end
return true
end
local function do_sign(task, sign_params)
if sign_params.alg and sign_params.alg ~= 'rsa' then
-- No support for ed25519 keys
return
end
if not prepare_arc_selector(task, sign_params) then
-- Broken arc
return
end
if settings.check_pubkey then
local resolve_name = sign_params.selector .. "._domainkey." .. sign_params.domain
task:get_resolver():resolve_txt({
task = task,
name = resolve_name,
callback = function(_, _, results, err)
if not err and results and results[1] then
sign_params.pubkey = results[1]
sign_params.strict_pubkey_check = not settings.allow_pubkey_mismatch
elseif not settings.allow_pubkey_mismatch then
rspamd_logger.errx('public key for domain %s/%s is not found: %s, skip signing',
sign_params.domain, sign_params.selector, err)
return
else
rspamd_logger.infox('public key for domain %s/%s is not found: %s',
sign_params.domain, sign_params.selector, err)
end
local dret, hdr = dkim_sign(task, sign_params)
if dret then
arc_sign_seal(task, sign_params, hdr)
end
end,
forced = true
})
else
local dret, hdr = dkim_sign(task, sign_params)
if dret then
arc_sign_seal(task, sign_params, hdr)
end
end
end
local function sign_error(task, msg)
rspamd_logger.errx(task, 'signing failure: %s', msg)
end
local function arc_signing_cb(task)
local ret, selectors = dkim_sign_tools.prepare_dkim_signing(N, task, settings)
if not ret then
return
end
if settings.use_redis then
dkim_sign_tools.sign_using_redis(N, task, settings, selectors, do_sign, sign_error)
else
if selectors.vault then
dkim_sign_tools.sign_using_vault(N, task, settings, selectors, do_sign, sign_error)
else
-- TODO: no support for multiple sigs
local cur_selector = selectors[1]
prepare_arc_selector(task, cur_selector)
if ((cur_selector.key or cur_selector.rawkey) and cur_selector.selector) then
if cur_selector.key then
cur_selector.key = lua_util.template(cur_selector.key, {
domain = cur_selector.domain,
selector = cur_selector.selector
})
local exists,err = rspamd_util.file_exists(cur_selector.key)
if not exists then
if err and err == 'No such file or directory' then
lua_util.debugm(N, task, 'cannot read key from %s: %s', cur_selector.key, err)
else
rspamd_logger.warnx(task, 'cannot read key from %s: %s', cur_selector.key, err)
end
return false
end
end
do_sign(task, cur_selector)
else
rspamd_logger.infox(task, 'key path or dkim selector unconfigured; no signing')
return false
end
end
end
end
dkim_sign_tools.process_signing_settings(N, settings, opts)
if not dkim_sign_tools.validate_signing_settings(settings) then
rspamd_logger.infox(rspamd_config, 'mandatory parameters missing, disable arc signing')
return
end
local ar_opts = rspamd_config:get_all_opt('milter_headers')
if ar_opts and ar_opts.routines then
local routines = ar_opts.routines
if routines['authentication-results'] then
ar_settings = lua_util.override_defaults(ar_settings,
routines['authentication-results'])
end
end
if settings.use_redis then
redis_params = rspamd_parse_redis_server('arc')
if not redis_params then
rspamd_logger.errx(rspamd_config, 'no servers are specified, '..
'but module is configured to load keys from redis, disable arc signing')
return
end
settings.redis_params = redis_params
end
local sym_reg_tbl = {
name = settings['sign_symbol'],
callback = arc_signing_cb,
groups = {"policies", "arc"},
score = 0.0,
}
if type(settings.allowed_ids) == 'table' then
sym_reg_tbl.allowed_ids = settings.allowed_ids
end
if type(settings.forbidden_ids) == 'table' then
sym_reg_tbl.forbidden_ids = settings.forbidden_ids
end
if settings.whitelisted_signers_map then
arc_symbols.trusted_allow = arc_symbols.trusted_allow or 'ARC_ALLOW_TRUSTED'
rspamd_config:register_symbol({
name = arc_symbols.trusted_allow,
parent = id,
type = 'virtual',
score = -2.0,
group = 'policies',
groups = {'arc'},
})
end
rspamd_config:register_symbol(sym_reg_tbl)
-- Do not sign unless checked
rspamd_config:register_dependency(settings['sign_symbol'], 'ARC_CALLBACK')
-- We need to check dmarc before signing as we have to produce valid AAR header
-- see #3613
rspamd_config:register_dependency(settings['sign_symbol'], 'DMARC_CALLBACK')
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