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--[[
Copyright (c) 2022, Vsevolod Stakhov <vsevolod@rspamd.com>
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 ansicolors = require "ansicolors"
local ucl = require "ucl"
local argparse = require "argparse"
local fun = require "fun"
local rspamd_http = require "rspamd_http"
local cr = require "rspamd_cryptobox"
local parser = argparse()
:name "rspamadm vault"
:description "Perform Hashicorp Vault management"
:help_description_margin(32)
:command_target("command")
:require_command(true)
parser:flag "-s --silent"
:description "Do not output extra information"
parser:option "-a --addr"
:description "Vault address (if not defined in VAULT_ADDR env)"
parser:option "-t --token"
:description "Vault token (not recommended, better define VAULT_TOKEN env)"
parser:option "-p --path"
:description "Path to work with in the vault"
:default "dkim"
parser:option "-o --output"
:description "Output format ('ucl', 'json', 'json-compact', 'yaml')"
:argname("<type>")
:convert {
ucl = "ucl",
json = "json",
['json-compact'] = "json-compact",
yaml = "yaml",
}
:default "ucl"
parser:command "list ls l"
:description "List elements in the vault"
local show = parser:command "show get"
:description "Extract element from the vault"
show:argument "domain"
:description "Domain to create key for"
:args "+"
local delete = parser:command "delete del rm remove"
:description "Delete element from the vault"
delete:argument "domain"
:description "Domain to create delete key(s) for"
:args "+"
local newkey = parser:command "newkey new create"
:description "Add new key to the vault"
newkey:argument "domain"
:description "Domain to create key for"
:args "+"
newkey:option "-s --selector"
:description "Selector to use"
:count "?"
newkey:option "-A --algorithm"
:argname("<type>")
:convert {
rsa = "rsa",
ed25519 = "ed25519",
eddsa = "ed25519",
}
:default "rsa"
newkey:option "-b --bits"
:argname("<nbits>")
:convert(tonumber)
:default "1024"
newkey:option "-x --expire"
:argname("<days>")
:convert(tonumber)
newkey:flag "-r --rewrite"
local roll = parser:command "roll rollover"
:description "Perform keys rollover"
roll:argument "domain"
:description "Domain to roll key(s) for"
:args "+"
roll:option "-T --ttl"
:description "Validity period for old keys (days)"
:convert(tonumber)
:default "1"
roll:flag "-r --remove-expired"
:description "Remove expired keys"
roll:option "-x --expire"
:argname("<days>")
:convert(tonumber)
local function printf(fmt, ...)
if fmt then
io.write(rspamd_logger.slog(fmt, ...))
end
io.write('\n')
end
local function maybe_printf(opts, fmt, ...)
if not opts.silent then
printf(fmt, ...)
end
end
local function highlight(str, color)
return ansicolors[color or 'white'] .. str .. ansicolors.reset
end
local function vault_url(opts, path)
if path then
return string.format('%s/v1/%s/%s', opts.addr, opts.path, path)
end
return string.format('%s/v1/%s', opts.addr, opts.path)
end
local function is_http_error(err, data)
return err or (math.floor(data.code / 100) ~= 2)
end
local function parse_vault_reply(data)
local p = ucl.parser()
local res,parser_err = p:parse_string(data)
if not res then
return nil,parser_err
else
return p:get_object(),nil
end
end
local function maybe_print_vault_data(opts, data, func)
if data then
local res,parser_err = parse_vault_reply(data)
if not res then
printf('vault reply for cannot be parsed: %s', parser_err)
else
if func then
printf(ucl.to_format(func(res), opts.output))
else
printf(ucl.to_format(res, opts.output))
end
end
else
printf('no data received')
end
end
local function print_dkim_txt_record(b64, selector, alg)
local labels = {}
local prefix = string.format("v=DKIM1; k=%s; p=", alg)
b64 = prefix .. b64
if #b64 < 255 then
labels = {'"' .. b64 .. '"'}
else
for sl=1,#b64,256 do
table.insert(labels, '"' .. b64:sub(sl, sl + 255) .. '"')
end
end
printf("%s._domainkey IN TXT ( %s )", selector,
table.concat(labels, "\n\t"))
end
local function show_handler(opts, domain)
local uri = vault_url(opts, domain)
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
headers = {
['X-Vault-Token'] = opts.token
}
}
if is_http_error(err, data) then
printf('cannot get request to the vault (%s), HTTP error code %s', uri, data.code)
maybe_print_vault_data(opts, err)
os.exit(1)
else
maybe_print_vault_data(opts, data.content, function(obj)
return obj.data.selectors
end)
end
end
local function delete_handler(opts, domain)
local uri = vault_url(opts, domain)
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
method = 'delete',
headers = {
['X-Vault-Token'] = opts.token
}
}
if is_http_error(err, data) then
printf('cannot get request to the vault (%s), HTTP error code %s', uri, data.code)
maybe_print_vault_data(opts, err)
os.exit(1)
else
printf('deleted key(s) for %s', domain)
end
end
local function list_handler(opts)
local uri = vault_url(opts)
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri .. '?list=true',
headers = {
['X-Vault-Token'] = opts.token
}
}
if is_http_error(err, data) then
printf('cannot get request to the vault (%s), HTTP error code %s', uri, data.code)
maybe_print_vault_data(opts, err)
os.exit(1)
else
maybe_print_vault_data(opts, data.content, function(obj)
return obj.data.keys
end)
end
end
-- Returns pair privkey+pubkey
local function genkey(opts)
return cr.gen_dkim_keypair(opts.algorithm, opts.bits)
end
local function create_and_push_key(opts, domain, existing)
local uri = vault_url(opts, domain)
local sk,pk = genkey(opts)
local res = {
selectors = {
[1] = {
selector = opts.selector,
domain = domain,
key = tostring(sk),
pubkey = tostring(pk),
alg = opts.algorithm,
bits = opts.bits or 0,
valid_start = os.time(),
}
}
}
for _,sel in ipairs(existing) do
res.selectors[#res.selectors + 1] = sel
end
if opts.expire then
res.selectors[1].valid_end = os.time() + opts.expire * 3600 * 24
end
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
method = 'put',
headers = {
['Content-Type'] = 'application/json',
['X-Vault-Token'] = opts.token
},
body = {
ucl.to_format(res, 'json-compact')
},
}
if is_http_error(err, data) then
printf('cannot get request to the vault (%s), HTTP error code %s', uri, data.code)
maybe_print_vault_data(opts, data.content)
os.exit(1)
else
maybe_printf(opts,'stored key for: %s, selector: %s', domain, opts.selector)
maybe_printf(opts, 'please place the corresponding public key as following:')
if opts.silent then
printf('%s', pk)
else
print_dkim_txt_record(tostring(pk), opts.selector, opts.algorithm)
end
end
end
local function newkey_handler(opts, domain)
local uri = vault_url(opts, domain)
if not opts.selector then
opts.selector = string.format('%s-%s', opts.algorithm,
os.date("!%Y%m%d"))
end
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
method = 'get',
headers = {
['X-Vault-Token'] = opts.token
}
}
if is_http_error(err, data) or not data.content then
create_and_push_key(opts, domain,{})
else
-- Key exists
local rep = parse_vault_reply(data.content)
if not rep or not rep.data then
printf('cannot parse reply for %s: %s', uri, data.content)
os.exit(1)
end
local elts = rep.data.selectors
if not elts then
create_and_push_key(opts, domain,{})
os.exit(0)
end
for _,sel in ipairs(elts) do
if sel.alg == opts.algorithm then
printf('key with the specific algorithm %s is already presented at %s selector for %s domain',
opts.algorithm, sel.selector, domain)
os.exit(1)
else
create_and_push_key(opts, domain, elts)
end
end
end
end
local function roll_handler(opts, domain)
local uri = vault_url(opts, domain)
local res = {
selectors = {}
}
local err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
method = 'get',
headers = {
['X-Vault-Token'] = opts.token
}
}
if is_http_error(err, data) or not data.content then
printf("No keys to roll for domain %s", domain)
os.exit(1)
else
local rep = parse_vault_reply(data.content)
if not rep or not rep.data then
printf('cannot parse reply for %s: %s', uri, data.content)
os.exit(1)
end
local elts = rep.data.selectors
if not elts then
printf("No keys to roll for domain %s", domain)
os.exit(1)
end
local nkeys = {} -- indexed by algorithm
local function insert_key(sel, add_expire)
if not nkeys[sel.alg] then
nkeys[sel.alg] = {}
end
if add_expire then
sel.valid_end = os.time() + opts.ttl * 3600 * 24
end
table.insert(nkeys[sel.alg], sel)
end
for _,sel in ipairs(elts) do
if sel.valid_end and sel.valid_end < os.time() then
if not opts.remove_expired then
insert_key(sel, false)
else
maybe_printf(opts, 'removed expired key for %s (selector %s, expire "%s"',
domain, sel.selector, os.date('%c', sel.valid_end))
end
else
insert_key(sel, true)
end
end
-- Now we need to ensure that all but one selectors have either expired or just a single key
for alg,keys in pairs(nkeys) do
table.sort(keys, function(k1, k2)
if k1.valid_end and k2.valid_end then
return k1.valid_end > k2.valid_end
elseif k1.valid_end then
return true
elseif k2.valid_end then
return false
end
return false
end)
-- Exclude the key with the highest expiration date and examine the rest
if not (#keys == 1 or fun.all(function(k)
return k.valid_end and k.valid_end < os.time()
end, fun.tail(keys))) then
printf('bad keys list for %s and %s algorithm', domain, alg)
fun.each(function(k)
if not k.valid_end then
printf('selector %s, algorithm %s has a key with no expire',
k.selector, k.alg)
elseif k.valid_end >= os.time() then
printf('selector %s, algorithm %s has a key that not yet expired: %s',
k.selector, k.alg, os.date('%c', k.valid_end))
end
end, fun.tail(keys))
os.exit(1)
end
-- Do not create new keys, if we only want to remove expired keys
if not opts.remove_expired then
-- OK to process
-- Insert keys for each algorithm in pairs <old_key(s)>, <new_key>
local sk,pk = genkey({algorithm = alg, bits = keys[1].bits})
local selector = string.format('%s-%s', alg,
os.date("!%Y%m%d"))
if selector == keys[1].selector then
selector = selector .. '-1'
end
local nelt = {
selector = selector,
domain = domain,
key = tostring(sk),
pubkey = tostring(pk),
alg = alg,
bits = keys[1].bits,
valid_start = os.time(),
}
if opts.expire then
nelt.valid_end = os.time() + opts.expire * 3600 * 24
end
table.insert(res.selectors, nelt)
end
for _,k in ipairs(keys) do
table.insert(res.selectors, k)
end
end
end
-- We can now store res in the vault
err,data = rspamd_http.request{
config = rspamd_config,
ev_base = rspamadm_ev_base,
session = rspamadm_session,
resolver = rspamadm_dns_resolver,
url = uri,
method = 'put',
headers = {
['Content-Type'] = 'application/json',
['X-Vault-Token'] = opts.token
},
body = {
ucl.to_format(res, 'json-compact')
},
}
if is_http_error(err, data) then
printf('cannot put request to the vault (%s), HTTP error code %s', uri, data.code)
maybe_print_vault_data(opts, data.content)
os.exit(1)
else
for _,key in ipairs(res.selectors) do
if not key.valid_end or key.valid_end > os.time() + opts.ttl * 3600 * 24 then
maybe_printf(opts,'rolled key for: %s, new selector: %s', domain, key.selector)
maybe_printf(opts, 'please place the corresponding public key as following:')
if opts.silent then
printf('%s', key.pubkey)
else
print_dkim_txt_record(key.pubkey, key.selector, key.alg)
end
end
end
maybe_printf(opts, 'your old keys will be valid until %s',
os.date('%c', os.time() + opts.ttl * 3600 * 24))
end
end
local function handler(args)
local opts = parser:parse(args)
if not opts.addr then
opts.addr = os.getenv('VAULT_ADDR')
end
if not opts.token then
opts.token = os.getenv('VAULT_TOKEN')
else
maybe_printf(opts, 'defining token via command line is insecure, define it via environment variable %s',
highlight('VAULT_TOKEN', 'red'))
end
if not opts.token or not opts.addr then
printf('no token or/and vault addr has been specified, exiting')
os.exit(1)
end
local command = opts.command
if command == 'list' then
list_handler(opts)
elseif command == 'show' then
fun.each(function(d) show_handler(opts, d) end, opts.domain)
elseif command == 'newkey' then
fun.each(function(d) newkey_handler(opts, d) end, opts.domain)
elseif command == 'roll' then
fun.each(function(d) roll_handler(opts, d) end, opts.domain)
elseif command == 'delete' then
fun.each(function(d) delete_handler(opts, d) end, opts.domain)
else
parser:error(string.format('command %s is not implemented', command))
end
end
return {
handler = handler,
description = parser._description,
name = 'vault'
}
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