1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
|
--[[
Copyright (c) 2017, 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 logger = require "rspamd_logger"
local lua_util = require "lua_util"
local rspamd_util = require "rspamd_util"
local fun = require "fun"
local function is_implicit(t)
local mt = getmetatable(t)
return mt and mt.class and mt.class == 'ucl.type.impl_array'
end
local function metric_pairs(t)
-- collect the keys
local keys = {}
local implicit_array = is_implicit(t)
local function gen_keys(tbl)
if implicit_array then
for _,v in ipairs(tbl) do
if v.name then
table.insert(keys, {v.name, v})
v.name = nil
else
-- Very tricky to distinguish:
-- group {name = "foo" ... } + group "blah" { ... }
for gr_name,gr in pairs(v) do
if type(gr_name) ~= 'number' then
-- We can also have implicit arrays here
local gr_implicit = is_implicit(gr)
if gr_implicit then
for _,gr_elt in ipairs(gr) do
table.insert(keys, {gr_name, gr_elt})
end
else
table.insert(keys, {gr_name, gr})
end
end
end
end
end
else
if tbl.name then
table.insert(keys, {tbl.name, tbl})
tbl.name = nil
else
for k,v in pairs(tbl) do
if type(k) ~= 'number' then
-- We can also have implicit arrays here
local sym_implicit = is_implicit(v)
if sym_implicit then
for _,elt in ipairs(v) do
table.insert(keys, {k, elt})
end
else
table.insert(keys, {k, v})
end
end
end
end
end
end
gen_keys(t)
-- return the iterator function
local i = 0
return function()
i = i + 1
if keys[i] then
return keys[i][1], keys[i][2]
end
end
end
local function group_transform(cfg, k, v)
if v.name then k = v.name end
local new_group = {
symbols = {}
}
if v.enabled then new_group.enabled = v.enabled end
if v.disabled then new_group.disabled = v.disabled end
if v.max_score then new_group.max_score = v.max_score end
if v.symbol then
for sk,sv in metric_pairs(v.symbol) do
if sv.name then
sk = sv.name
sv.name = nil -- Remove field
end
new_group.symbols[sk] = sv
end
end
if not cfg.group then cfg.group = {} end
if cfg.group[k] then
cfg.group[k] = lua_util.override_defaults(cfg.group[k], new_group)
else
cfg.group[k] = new_group
end
logger.infox("overriding group %s from the legacy metric settings", k)
end
local function symbol_transform(cfg, k, v)
-- first try to find any group where there is a definition of this symbol
for gr_n, gr in pairs(cfg.group) do
if gr.symbols and gr.symbols[k] then
-- We override group symbol with ungrouped symbol
logger.infox("overriding group symbol %s in the group %s", k, gr_n)
gr.symbols[k] = lua_util.override_defaults(gr.symbols[k], v)
return
end
end
-- Now check what Rspamd knows about this symbol
local sym = rspamd_config:get_metric_symbol(k)
if not sym or not sym.group then
-- Otherwise we just use group 'ungrouped'
if not cfg.group.ungrouped then
cfg.group.ungrouped = {
symbols = {}
}
end
cfg.group.ungrouped.symbols[k] = v
logger.debugx("adding symbol %s to the group 'ungrouped'", k)
end
end
local function test_groups(groups)
for gr_name, gr in pairs(groups) do
if not gr.symbols then
local cnt = 0
for _,_ in pairs(gr) do cnt = cnt + 1 end
if cnt == 0 then
logger.debugx('group %s is empty', gr_name)
else
logger.infox('group %s has no symbols', gr_name)
end
end
end
end
local function convert_metric(cfg, metric)
if metric.actions then
cfg.actions = lua_util.override_defaults(cfg.actions, metric.actions)
logger.infox("overriding actions from the legacy metric settings")
end
if metric.unknown_weight then
cfg.actions.unknown_weight = metric.unknown_weight
end
if metric.subject then
logger.infox("overriding subject from the legacy metric settings")
cfg.actions.subject = metric.subject
end
if metric.group then
for k, v in metric_pairs(metric.group) do
group_transform(cfg, k, v)
end
else
if not cfg.group then
cfg.group = {
ungrouped = {
symbols = {}
}
}
end
end
if metric.symbol then
for k, v in metric_pairs(metric.symbol) do
symbol_transform(cfg, k, v)
end
end
return cfg
end
-- Converts a table of groups indexed by number (implicit array) to a
-- merged group definition
local function merge_groups(groups)
local ret = {}
for k,gr in pairs(groups) do
if type(k) == 'number' then
for key,sec in pairs(gr) do
ret[key] = sec
end
else
ret[k] = gr
end
end
return ret
end
-- Checks configuration files for statistics
local function check_statistics_sanity()
local local_conf = rspamd_paths['LOCAL_CONFDIR']
local local_stat = string.format('%s/local.d/%s', local_conf,
'statistic.conf')
local local_bayes = string.format('%s/local.d/%s', local_conf,
'classifier-bayes.conf')
if rspamd_util.file_exists(local_stat) and
rspamd_util.file_exists(local_bayes) then
logger.warnx(rspamd_config, 'conflicting files %s and %s are found: '..
'Rspamd classifier configuration might be broken!', local_stat, local_bayes)
end
end
-- Converts surbl module config to rbl module
local function surbl_section_convert(cfg, section)
local rbl_section = cfg.rbl.rbls
local wl = section.whitelist
for name,value in pairs(section.rules or {}) do
if rbl_section[name] then
logger.warnx(rspamd_config, 'conflicting names in surbl and rbl rules: %s, prefer surbl rule!',
name)
end
local converted = {
urls = true,
ignore_defaults = true,
}
if wl then
converted.whitelist = wl
end
for k,v in pairs(value) do
local skip = false
-- Rename
if k == 'suffix' then k = 'rbl' end
if k == 'ips' then k = 'returncodes' end
if k == 'bits' then k = 'returnbits' end
if k == 'noip' then k = 'no_ip' end
-- Crappy legacy
if k == 'options' then
if v == 'noip' or v == 'no_ip' then
converted.no_ip = true
skip = true
end
end
if k:match('check_') then
local n = k:match('check_(.*)')
k = n
end
if k == 'dkim' and v then
converted.dkim_domainonly = false
converted.dkim_match_from = true
end
if k == 'emails' and v then
-- To match surbl behaviour
converted.emails_domainonly = true
end
if not skip then
converted[k] = lua_util.deepcopy(v)
end
end
rbl_section[name] = lua_util.override_defaults(rbl_section[name], converted)
end
end
-- Converts surbl module config to rbl module
local function emails_section_convert(cfg, section)
local rbl_section = cfg.rbl.rbls
local wl = section.whitelist
for name,value in pairs(section.rules or {}) do
if rbl_section[name] then
logger.warnx(rspamd_config, 'conflicting names in emails and rbl rules: %s, prefer emails rule!',
name)
end
local converted = {
emails = true,
ignore_defaults = true,
}
if wl then
converted.whitelist = wl
end
for k,v in pairs(value) do
local skip = false
-- Rename
if k == 'dnsbl' then k = 'rbl' end
if k == 'check_replyto' then k = 'replyto' end
if k == 'hashlen' then k = 'hash_len' end
if k == 'encoding' then k = 'hash_format' end
if k == 'domain_only' then k = 'emails_domainonly' end
if k == 'delimiter' then k = 'emails_delimiter' end
if k == 'skip_body' then
skip = true
if v then
-- Hack
converted.emails = false
converted.replyto = true
else
converted.emails = true
end
end
if k == 'expect_ip' then
-- Another stupid hack
if not converted.return_codes then
converted.returncodes = {}
end
local symbol = value.symbol or name
converted.returncodes[symbol] = { v }
skip = true
end
if not skip then
converted[k] = lua_util.deepcopy(v)
end
end
rbl_section[name] = lua_util.override_defaults(rbl_section[name], converted)
end
end
return function(cfg)
local ret = false
if cfg['metric'] then
for _, v in metric_pairs(cfg.metric) do
cfg = convert_metric(cfg, v)
end
ret = true
end
if cfg.symbols then
for k, v in metric_pairs(cfg.symbols) do
symbol_transform(cfg, k, v)
end
end
check_statistics_sanity()
if not cfg.actions then
logger.errx('no actions defined')
else
-- Perform sanity check for actions
local actions_defs = {'no action', 'no_action', -- In case if that's added
'greylist', 'add header', 'add_header',
'rewrite subject', 'rewrite_subject', 'reject'}
if not cfg.actions['no action'] and not cfg.actions['no_action'] and
not cfg.actions['accept'] then
for _,d in ipairs(actions_defs) do
if cfg.actions[d] and type(cfg.actions[d]) == 'number' then
if cfg.actions[d] < 0 then
cfg.actions['no action'] = cfg.actions[d] - 0.001
logger.infox('set no action score to: %s, as action %s has negative score',
cfg.actions['no action'], d)
break
end
end
end
end
local actions_set = {}
for _,d in ipairs(actions_defs) do
actions_set[d] = true
end
-- Now check actions section for garbadge
actions_set['unknown_weight'] = true
actions_set['grow_factor'] = true
actions_set['subject'] = true
for k,_ in pairs(cfg.actions) do
if not actions_set[k] then
logger.warnx('unknown element in actions section: %s', k)
end
end
end
if not cfg.group then
logger.errx('no symbol groups defined')
else
if cfg.group[1] then
-- We need to merge groups
cfg.group = merge_groups(cfg.group)
ret = true
end
test_groups(cfg.group)
end
-- Deal with dkim settings
if not cfg.dkim then
cfg.dkim = {}
else
if cfg.dkim.sign_condition then
-- We have an obsoleted sign condition, so we need to either add dkim_signing and move it
-- there or just move sign condition there...
if not cfg.dkim_signing then
logger.warnx('obsoleted DKIM signing method used, converting it to "dkim_signing" module')
cfg.dkim_signing = {
sign_condition = cfg.dkim.sign_condition
}
else
if not cfg.dkim_signing.sign_condition then
logger.warnx('obsoleted DKIM signing method used, move it to "dkim_signing" module')
cfg.dkim_signing.sign_condition = cfg.dkim.sign_condition
else
logger.warnx('obsoleted DKIM signing method used, ignore it as "dkim_signing" also defines condition!')
end
end
end
end
-- Again: legacy stuff :(
if not cfg.dkim.sign_headers then
local sec = cfg.dkim_signing
if sec and sec[1] then sec = cfg.dkim_signing[1] end
if sec and sec.sign_headers then
cfg.dkim.sign_headers = sec.sign_headers
end
end
-- DKIM signing/ARC legacy
for _, mod in ipairs({'dkim_signing', 'arc'}) do
if cfg[mod] then
if cfg[mod].auth_only ~= nil then
if cfg[mod].sign_authenticated ~= nil then
logger.warnx(rspamd_config,
'both auth_only (%s) and sign_authenticated (%s) for %s are specified, prefer auth_only',
cfg[mod].auth_only, cfg[mod].sign_authenticated, mod)
end
cfg[mod].sign_authenticated = cfg[mod].auth_only
end
end
end
if cfg.dkim and cfg.dkim.sign_headers and type(cfg.dkim.sign_headers) == 'table' then
-- Flatten
cfg.dkim.sign_headers = table.concat(cfg.dkim.sign_headers, ':')
end
-- Try to find some obvious issues with configuration
for k,v in pairs(cfg) do
if type(v) == 'table' and v[k] and type (v[k]) == 'table' then
logger.errx('nested section: %s { %s { ... } }, it is likely a configuration error',
k, k)
end
end
-- If neural network is enabled we MUST have `check_all_filters` flag
if cfg.neural then
if not cfg.options then
cfg.options = {}
end
if not cfg.options.check_all_filters then
logger.infox(rspamd_config, 'enable `options.check_all_filters` for neural network')
cfg.options.check_all_filters = true
end
end
-- Deal with IP_SCORE
if cfg.ip_score and (cfg.ip_score.servers or cfg.redis.servers) then
logger.warnx(rspamd_config, 'ip_score module is deprecated in honor of reputation module!')
if not cfg.reputation then
cfg.reputation = {
rules = {}
}
end
if not cfg.reputation.rules then cfg.reputation.rules = {} end
if not fun.any(function(_, v) return v.selector and v.selector.ip end,
cfg.reputation.rules) then
logger.infox(rspamd_config, 'attach ip reputation element to use it')
cfg.reputation.rules.ip_score = {
selector = {
ip = {},
},
backend = {
redis = {},
}
}
if cfg.ip_score.servers then
cfg.reputation.rules.ip_score.backend.redis.servers = cfg.ip_score.servers
end
if cfg.symbols and cfg.symbols['IP_SCORE'] then
local t = cfg.symbols['IP_SCORE']
if not cfg.symbols['SENDER_REP_SPAM'] then
cfg.symbols['SENDER_REP_SPAM'] = t
cfg.symbols['SENDER_REP_HAM'] = t
cfg.symbols['SENDER_REP_HAM'].weight = -(t.weight or 0)
end
end
else
logger.infox(rspamd_config, 'ip reputation already exists, do not do any IP_SCORE transforms')
end
end
if cfg.surbl then
if not cfg.rbl then
cfg.rbl = {
rbls = {}
}
end
if not cfg.rbl.rbls then
cfg.rbl.rbls = {}
end
surbl_section_convert(cfg, cfg.surbl)
logger.infox(rspamd_config, 'converted surbl rules to rbl rules')
cfg.surbl = {}
end
if cfg.emails then
if not cfg.rbl then
cfg.rbl = {
rbls = {}
}
end
if not cfg.rbl.rbls then
cfg.rbl.rbls = {}
end
emails_section_convert(cfg, cfg.emails)
logger.infox(rspamd_config, 'converted emails rules to rbl rules')
cfg.emails = {}
end
return ret, cfg
end
|