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
|
-- gitano.lace
--
-- Interface to Lace for rules management
--
-- Copyright 2012-2017 Daniel Silverstone <dsilvers@digital-scurf.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
-- 3. Neither the name of the author nor the names of their contributors
-- may be used to endorse or promote products derived from this software
-- without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
--
local lace = require 'lace'
local util = require 'gitano.util'
local gall = require 'gall'
local log = require 'gitano.log'
local i18n = require 'gitano.i18n'
local pcre = require "rex_pcre"
local global_lookaside = {
["_basis"] = [[
include global:core
]]
}
local function _loader(ctx, _name)
local global_name = _name:match("^global:(.+)$")
local name, tree, sha = global_name or _name
if not global_name then
-- Project load
if ctx.project and not ctx.project_tree then
ctx.project_tree = gall.tree.flatten(ctx.project.content.tree.content)
end
if ctx.project_tree then
tree = ctx.project_tree
sha = ctx.project.sha
end
else
-- Global load
if global_lookaside[global_name] then
local resolved = global_lookaside[global_name]
if type(resolved) == "function" then
resolved = resolved(ctx)
end
return "global_lookaside::" .. global_name, resolved
end
if not ctx.global_tree then
ctx.global_tree = gall.tree.flatten(ctx.global.content.tree.content)
end
tree = ctx.global_tree
sha = ctx.global.sha
end
if not tree then
log.ddebug(i18n.expand("DEBUG_EMPTY_OBJECT_NASCENT"))
return "empty", "# Nothing to see here\n"
end
local blob_name = "rules/" .. name .. ".lace"
local real_name = sha .. "::" .. blob_name
if not tree[blob_name] or tree[blob_name].type ~= "blob" then
local m = i18n.expand("ERROR_UNABLE_TO_FIND_RULE",
{ name=blob_name, sha=sha, inname=_name })
log.ddebug(m)
return lace.error.error(m)
end
return real_name, tree[blob_name].obj.content
end
local match_types = {
exact = function(want, have)
return want == have
end,
prefix = function(want, have)
return have:sub(1, #want) == want
end,
suffix = function(want, have)
return have:sub(-#want) == want
end,
pattern = function(want, have)
return (have:match(want) ~= nil)
end,
pcre = function(want, have)
return (pcre.match(have, want) ~= nil)
end
}
-- Match aliases (auto-inverted)
match_types.is = match_types.exact
match_types.starts = match_types.prefix
match_types.ends = match_types.suffix
match_types.startswith = match_types.prefix
match_types.endswith = match_types.suffix
-- Inverted matches
do
local inverted_matches = {}
for k, v in pairs(match_types) do
inverted_matches["!" .. k] = function(...) return not v(...) end
end
for k, v in pairs(inverted_matches) do
match_types[k] = v
end
end
local function _do_simple_match(ctx, key, matchtype, value)
value = util.process_expansion(ctx, value)
local kk = ctx[key] or ""
local check = match_types[matchtype]
if type(kk) == "function" then
-- Realise the value first
ctx[key] = kk(ctx)
kk = ctx[key]
end
if type(kk) == "string" then
return check(value, kk)
else
local ret = false
for k in pairs(kk) do
ret = ret or check(value, k)
end
if matchtype:sub(1,1) == "!" then
ret = not ret
end
return ret
end
end
local function _simple_match(ctx, key, matchtype, value, guard)
if guard ~= nil then
return lace.error.error(i18n.expand("ERROR_UNEXPECTED_ADDITIONAL_ARGUMENT"), {4})
end
if value == nil then
return lace.error.error(i18n.expand("ERROR_MISSING_MATCHTYPE_OR_VALUE"), {1})
end
if match_types[matchtype] == nil then
return lace.error.error(i18n.expand("ERROR_UNKNOWN_MATCHTYPE"), {2})
end
return {
fn = _do_simple_match,
args = { key, matchtype, util.prep_expansion(value) }
}
end
local simples = {
-- Trivial strings/lists
"operation", "ref", "group", "user", "repository",
"source", "oldsha", "newsha", "target",
-- Trees for update operations (flat lists)
"start_tree", "target_tree",
-- Tree diffs for update operations (flat lists)
"treediff/targets", "treediff/added",
"treediff/deleted", "treediff/modified", "treediff/renamed",
"treediff/renamedto",
-- Stuff for 'as' users
"as_user", "as_group",
-- Stuff for site admin commands
"targetuser", "targetgroup", "member",
-- Stuff from update hooks for object types
"oldtype", "oldtaggedtype", "oldtaggedsha", "oldsigned",
"newtype", "newtaggedtype", "newtaggedsha", "newsigned",
-- Stuff for keyring command
"keyringname",
-- Stuff for config command
"key", "value",
}
local matchers = {}
for _, s in ipairs(simples) do
matchers[s] = _simple_match
end
local base_compcontext = {
_lace = {
loader = _loader,
controltype = matchers,
}
}
local function cloddly_bless(ctx)
local function indexer(tab, name)
if name:sub(1,7) == "config/" then
tab[name] = _simple_match
return _simple_match
end
end
setmetatable(ctx._lace.controltype, {__index = indexer})
return ctx
end
local function compile_ruleset(repo, adminsha, globaladminsha)
-- repo is a gitano repository object.
-- We trust that we can compile the repo's ruleset which involves
-- finding the admin sha for the repo (unless given) and then the global
-- admin sha (unless given) and using that to compile a full ruleset.
local compcontext = cloddly_bless(util.deep_copy(base_compcontext))
compcontext.repo = repo
if not repo.is_nascent then
if not adminsha then
compcontext.project = repo.git:get("refs/gitano/admin")
else
compcontext.project = repo.git:get(adminsha)
end
end
if not globaladminsha then
compcontext.global = repo.config.commit
else
compcontext.global = repo.config.repo.git:get(globaladminsha)
end
return lace.compiler.compile(compcontext, "global:_basis")
end
local function run_ruleset(ruleset, ctx)
-- First check if we're running as bypass
if ctx.as_user == "gitano-bypass" then
log.state(i18n.expand("LACE_BYPASS_BANNER_HEADER"))
log.state(i18n.expand("LACE_BYPASS_ALERT_MESSAGE"))
log.state(i18n.expand("LACE_BYPASS_BANNER_FOOTER"))
return "allow", i18n.expand("LACE_BYPASSED")
end
if ctx.as_user == nil and ctx.user == "gitano-bypass" then
log.state(i18n.expand("LACE_BYPASS_BANNER_HEADER"))
log.state(i18n.expand("LACE_BYPASS_ALERT_MESSAGE"))
log.state(i18n.expand("LACE_BYPASS_BANNER_FOOTER"))
return "allow", i18n.expand("LACE_BYPASSED")
end
return lace.engine.run(ruleset, ctx)
end
return {
compile = compile_ruleset,
run = run_ruleset,
}
|