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authorJune McEnroe2021-01-20 13:33:37 -0500
committerJune McEnroe2022-02-13 18:24:04 -0500
commitd993e4be6731b1a806e2c7588334a3f485a5fd31 (patch)
tree3d6276d4a791560a48d9481c31b9e7eba9fcc2a6 /filters
parentMerge remote-tracking branch 'ch/git-2-35' (diff)
downloadcgit-d993e4be6731b1a806e2c7588334a3f485a5fd31.tar.gz
cgit-d993e4be6731b1a806e2c7588334a3f485a5fd31.zip
Remove Lua support
Lua support is unused and the dlsym fwrite/write hacks horrify me.
Clean it up.
Diffstat (limited to 'filters')
-rw-r--r--filters/email-gravatar.lua35
-rwxr-xr-xfilters/email-gravatar.py3
-rw-r--r--filters/email-libravatar.lua36
-rw-r--r--filters/file-authentication.lua359
-rw-r--r--filters/gentoo-ldap-authentication.lua360
-rw-r--r--filters/owner-example.lua17
-rw-r--r--filters/simple-authentication.lua314
7 files changed, 0 insertions, 1124 deletions
diff --git a/filters/email-gravatar.lua b/filters/email-gravatar.lua deleted file mode 100644 index c39b490..0000000 --- a/filters/email-gravatar.lua +++ /dev/null
@@ -1,35 +0,0 @@
1-- This script may be used with the email-filter or repo.email-filter settings in cgitrc.
2-- It adds gravatar icons to author names. It is designed to be used with the lua:
3-- prefix in filters. It is much faster than the corresponding python script.
4--
5-- Requirements:
6-- luaossl
7-- <http://25thandclement.com/~william/projects/luaossl.html>
8--
9
10local digest = require("openssl.digest")
11
12function md5_hex(input)
13 local b = digest.new("md5"):final(input)
14 local x = ""
15 for i = 1, #b do
16 x = x .. string.format("%.2x", string.byte(b, i))
17 end
18 return x
19end
20
21function filter_open(email, page)
22 buffer = ""
23 md5 = md5_hex(email:sub(2, -2):lower())
24end
25
26function filter_close()
27 html("<img src='//www.gravatar.com/avatar/" .. md5 .. "?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> " .. buffer)
28 return 0
29end
30
31function filter_write(str)
32 buffer = buffer .. str
33end
34
35
diff --git a/filters/email-gravatar.py b/filters/email-gravatar.py index d70440e..012113c 100755 --- a/filters/email-gravatar.py +++ b/filters/email-gravatar.py
@@ -1,8 +1,5 @@
1#!/usr/bin/env python3 1#!/usr/bin/env python3
2 2
3# Please prefer the email-gravatar.lua using lua: as a prefix over this script. This
4# script is very slow, in comparison.
5#
6# This script may be used with the email-filter or repo.email-filter settings in cgitrc. 3# This script may be used with the email-filter or repo.email-filter settings in cgitrc.
7# 4#
8# The following environment variables can be used to retrieve the configuration 5# The following environment variables can be used to retrieve the configuration
diff --git a/filters/email-libravatar.lua b/filters/email-libravatar.lua deleted file mode 100644 index 7336baf..0000000 --- a/filters/email-libravatar.lua +++ /dev/null
@@ -1,36 +0,0 @@
1-- This script may be used with the email-filter or repo.email-filter settings in cgitrc.
2-- It adds libravatar icons to author names. It is designed to be used with the lua:
3-- prefix in filters.
4--
5-- Requirements:
6-- luaossl
7-- <http://25thandclement.com/~william/projects/luaossl.html>
8--
9
10local digest = require("openssl.digest")
11
12function md5_hex(input)
13 local b = digest.new("md5"):final(input)
14 local x = ""
15 for i = 1, #b do
16 x = x .. string.format("%.2x", string.byte(b, i))
17 end
18 return x
19end
20
21function filter_open(email, page)
22 buffer = ""
23 md5 = md5_hex(email:sub(2, -2):lower())
24end
25
26function filter_close()
27 baseurl = os.getenv("HTTPS") and "https://seccdn.libravatar.org/" or "http://cdn.libravatar.org/"
28 html("<img src='" .. baseurl .. "avatar/" .. md5 .. "?s=13&amp;d=retro' width='13' height='13' alt='Libravatar' /> " .. buffer)
29 return 0
30end
31
32function filter_write(str)
33 buffer = buffer .. str
34end
35
36
diff --git a/filters/file-authentication.lua b/filters/file-authentication.lua deleted file mode 100644 index 0248804..0000000 --- a/filters/file-authentication.lua +++ /dev/null
@@ -1,359 +0,0 @@
1-- This script may be used with the auth-filter.
2--
3-- Requirements:
4-- luaossl
5-- <http://25thandclement.com/~william/projects/luaossl.html>
6-- luaposix
7-- <https://github.com/luaposix/luaposix>
8--
9local sysstat = require("posix.sys.stat")
10local unistd = require("posix.unistd")
11local rand = require("openssl.rand")
12local hmac = require("openssl.hmac")
13
14-- This file should contain a series of lines in the form of:
15-- username1:hash1
16-- username2:hash2
17-- username3:hash3
18-- ...
19-- Hashes can be generated using something like `mkpasswd -m sha-512 -R 300000`.
20-- This file should not be world-readable.
21local users_filename = "/etc/cgit-auth/users"
22
23-- This file should contain a series of lines in the form of:
24-- groupname1:username1,username2,username3,...
25-- ...
26local groups_filename = "/etc/cgit-auth/groups"
27
28-- This file should contain a series of lines in the form of:
29-- reponame1:groupname1,groupname2,groupname3,...
30-- ...
31local repos_filename = "/etc/cgit-auth/repos"
32
33-- Set this to a path this script can write to for storing a persistent
34-- cookie secret, which should not be world-readable.
35local secret_filename = "/var/cache/cgit/auth-secret"
36
37--
38--
39-- Authentication functions follow below. Swap these out if you want different authentication semantics.
40--
41--
42
43-- Looks up a hash for a given user.
44function lookup_hash(user)
45 local line
46 for line in io.lines(users_filename) do
47 local u, h = string.match(line, "(.-):(.+)")
48 if u:lower() == user:lower() then
49 return h
50 end
51 end
52 return nil
53end
54
55-- Looks up users for a given repo.
56function lookup_users(repo)
57 local users = nil
58 local groups = nil
59 local line, group, user
60 for line in io.lines(repos_filename) do
61 local r, g = string.match(line, "(.-):(.+)")
62 if r == repo then
63 groups = { }
64 for group in string.gmatch(g, "([^,]+)") do
65 groups[group:lower()] = true
66 end
67 break
68 end
69 end
70 if groups == nil then
71 return nil
72 end
73 for line in io.lines(groups_filename) do
74 local g, u = string.match(line, "(.-):(.+)")
75 if groups[g:lower()] then
76 if users == nil then
77 users = { }
78 end
79 for user in string.gmatch(u, "([^,]+)") do
80 users[user:lower()] = true
81 end
82 end
83 end
84 return users
85end
86
87
88-- Sets HTTP cookie headers based on post and sets up redirection.
89function authenticate_post()
90 local hash = lookup_hash(post["username"])
91 local redirect = validate_value("redirect", post["redirect"])
92
93 if redirect == nil then
94 not_found()
95 return 0
96 end
97
98 redirect_to(redirect)
99
100 if hash == nil or hash ~= unistd.crypt(post["password"], hash) then
101 set_cookie("cgitauth", "")
102 else
103 -- One week expiration time
104 local username = secure_value("username", post["username"], os.time() + 604800)
105 set_cookie("cgitauth", username)
106 end
107
108 html("\n")
109 return 0
110end
111
112
113-- Returns 1 if the cookie is valid and 0 if it is not.
114function authenticate_cookie()
115 accepted_users = lookup_users(cgit["repo"])
116 if accepted_users == nil then
117 -- We return as valid if the repo is not protected.
118 return 1
119 end
120
121 local username = validate_value("username", get_cookie(http["cookie"], "cgitauth"))
122 if username == nil or not accepted_users[username:lower()] then
123 return 0
124 else
125 return 1
126 end
127end
128
129-- Prints the html for the login form.
130function body()
131 html("<h2>Authentication Required</h2>")
132 html("<form method='post' action='")
133 html_attr(cgit["login"])
134 html("'>")
135 html("<input type='hidden' name='redirect' value='")
136 html_attr(secure_value("redirect", cgit["url"], 0))
137 html("' />")
138 html("<table>")
139 html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
140 html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
141 html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
142 html("</table></form>")
143
144 return 0
145end
146
147
148
149--
150--
151-- Wrapper around filter API, exposing the http table, the cgit table, and the post table to the above functions.
152--
153--
154
155local actions = {}
156actions["authenticate-post"] = authenticate_post
157actions["authenticate-cookie"] = authenticate_cookie
158actions["body"] = body
159
160function filter_open(...)
161 action = actions[select(1, ...)]
162
163 http = {}
164 http["cookie"] = select(2, ...)
165 http["method"] = select(3, ...)
166 http["query"] = select(4, ...)
167 http["referer"] = select(5, ...)
168 http["path"] = select(6, ...)
169 http["host"] = select(7, ...)
170 http["https"] = select(8, ...)
171
172 cgit = {}
173 cgit["repo"] = select(9, ...)
174 cgit["page"] = select(10, ...)
175 cgit["url"] = select(11, ...)
176 cgit["login"] = select(12, ...)
177
178end
179
180function filter_close()
181 return action()
182end
183
184function filter_write(str)
185 post = parse_qs(str)
186end
187
188
189--
190--
191-- Utility functions based on keplerproject/wsapi.
192--
193--
194
195function url_decode(str)
196 if not str then
197 return ""
198 end
199 str = string.gsub(str, "+", " ")
200 str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
201 str = string.gsub(str, "\r\n", "\n")
202 return str
203end
204
205function url_encode(str)
206 if not str then
207 return ""
208 end
209 str = string.gsub(str, "\n", "\r\n")
210 str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
211 str = string.gsub(str, " ", "+")
212 return str
213end
214
215function parse_qs(qs)
216 local tab = {}
217 for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
218 tab[url_decode(key)] = url_decode(val)
219 end
220 return tab
221end
222
223function get_cookie(cookies, name)
224 cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
225 return url_decode(string.match(cookies, ";" .. name .. "=(.-);"))
226end
227
228function tohex(b)
229 local x = ""
230 for i = 1, #b do
231 x = x .. string.format("%.2x", string.byte(b, i))
232 end
233 return x
234end
235
236--
237--
238-- Cookie construction and validation helpers.
239--
240--
241
242local secret = nil
243
244-- Loads a secret from a file, creates a secret, or returns one from memory.
245function get_secret()
246 if secret ~= nil then
247 return secret
248 end
249 local secret_file = io.open(secret_filename, "r")
250 if secret_file == nil then
251 local old_umask = sysstat.umask(63)
252 local temporary_filename = secret_filename .. ".tmp." .. tohex(rand.bytes(16))
253 local temporary_file = io.open(temporary_filename, "w")
254 if temporary_file == nil then
255 os.exit(177)
256 end
257 temporary_file:write(tohex(rand.bytes(32)))
258 temporary_file:close()
259 unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
260 unistd.unlink(temporary_filename)
261 sysstat.umask(old_umask)
262 secret_file = io.open(secret_filename, "r")
263 end
264 if secret_file == nil then
265 os.exit(177)
266 end
267 secret = secret_file:read()
268 secret_file:close()
269 if secret:len() ~= 64 then
270 os.exit(177)
271 end
272 return secret
273end
274
275-- Returns value of cookie if cookie is valid. Otherwise returns nil.
276function validate_value(expected_field, cookie)
277 local i = 0
278 local value = ""
279 local field = ""
280 local expiration = 0
281 local salt = ""
282 local chmac = ""
283
284 if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
285 return nil
286 end
287
288 for component in string.gmatch(cookie, "[^|]+") do
289 if i == 0 then
290 field = component
291 elseif i == 1 then
292 value = component
293 elseif i == 2 then
294 expiration = tonumber(component)
295 if expiration == nil then
296 expiration = -1
297 end
298 elseif i == 3 then
299 salt = component
300 elseif i == 4 then
301 chmac = component
302 else
303 break
304 end
305 i = i + 1
306 end
307
308 if chmac == nil or chmac:len() == 0 then
309 return nil
310 end
311
312 -- Lua hashes strings, so these comparisons are time invariant.
313 if chmac ~= tohex(hmac.new(get_secret(), "sha256"):final(field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt)) then
314 return nil
315 end
316
317 if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then
318 return nil
319 end
320
321 if url_decode(field) ~= expected_field then
322 return nil
323 end
324
325 return url_decode(value)
326end
327
328function secure_value(field, value, expiration)
329 if value == nil or value:len() <= 0 then
330 return ""
331 end
332
333 local authstr = ""
334 local salt = tohex(rand.bytes(16))
335 value = url_encode(value)
336 field = url_encode(field)
337 authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
338 authstr = authstr .. "|" .. tohex(hmac.new(get_secret(), "sha256"):final(authstr))
339 return authstr
340end
341
342function set_cookie(cookie, value)
343 html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly")
344 if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
345 html("; secure")
346 end
347 html("\n")
348end
349
350function redirect_to(url)
351 html("Status: 302 Redirect\n")
352 html("Cache-Control: no-cache, no-store\n")
353 html("Location: " .. url .. "\n")
354end
355
356function not_found()
357 html("Status: 404 Not Found\n")
358 html("Cache-Control: no-cache, no-store\n\n")
359end
diff --git a/filters/gentoo-ldap-authentication.lua b/filters/gentoo-ldap-authentication.lua deleted file mode 100644 index 673c88d..0000000 --- a/filters/gentoo-ldap-authentication.lua +++ /dev/null
@@ -1,360 +0,0 @@
1-- This script may be used with the auth-filter. Be sure to configure it as you wish.
2--
3-- Requirements:
4-- luaossl
5-- <http://25thandclement.com/~william/projects/luaossl.html>
6-- lualdap >= 1.2
7-- <https://git.zx2c4.com/lualdap/about/>
8-- luaposix
9-- <https://github.com/luaposix/luaposix>
10--
11local sysstat = require("posix.sys.stat")
12local unistd = require("posix.unistd")
13local lualdap = require("lualdap")
14local rand = require("openssl.rand")
15local hmac = require("openssl.hmac")
16
17--
18--
19-- Configure these variables for your settings.
20--
21--
22
23-- A list of password protected repositories, with which gentooAccess
24-- group is allowed to access each one.
25local protected_repos = {
26 glouglou = "infra",
27 portage = "dev"
28}
29
30-- Set this to a path this script can write to for storing a persistent
31-- cookie secret, which should be guarded.
32local secret_filename = "/var/cache/cgit/auth-secret"
33
34
35--
36--
37-- Authentication functions follow below. Swap these out if you want different authentication semantics.
38--
39--
40
41-- Sets HTTP cookie headers based on post and sets up redirection.
42function authenticate_post()
43 local redirect = validate_value("redirect", post["redirect"])
44
45 if redirect == nil then
46 not_found()
47 return 0
48 end
49
50 redirect_to(redirect)
51
52 local groups = gentoo_ldap_user_groups(post["username"], post["password"])
53 if groups == nil then
54 set_cookie("cgitauth", "")
55 else
56 -- One week expiration time
57 set_cookie("cgitauth", secure_value("gentoogroups", table.concat(groups, ","), os.time() + 604800))
58 end
59
60 html("\n")
61 return 0
62end
63
64
65-- Returns 1 if the cookie is valid and 0 if it is not.
66function authenticate_cookie()
67 local required_group = protected_repos[cgit["repo"]]
68 if required_group == nil then
69 -- We return as valid if the repo is not protected.
70 return 1
71 end
72
73 local user_groups = validate_value("gentoogroups", get_cookie(http["cookie"], "cgitauth"))
74 if user_groups == nil or user_groups == "" then
75 return 0
76 end
77 for group in string.gmatch(user_groups, "[^,]+") do
78 if group == required_group then
79 return 1
80 end
81 end
82 return 0
83end
84
85-- Prints the html for the login form.
86function body()
87 html("<h2>Gentoo LDAP Authentication Required</h2>")
88 html("<form method='post' action='")
89 html_attr(cgit["login"])
90 html("'>")
91 html("<input type='hidden' name='redirect' value='")
92 html_attr(secure_value("redirect", cgit["url"], 0))
93 html("' />")
94 html("<table>")
95 html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
96 html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
97 html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
98 html("</table></form>")
99
100 return 0
101end
102
103--
104--
105-- Gentoo LDAP support.
106--
107--
108
109function gentoo_ldap_user_groups(username, password)
110 -- Ensure the user is alphanumeric
111 if username == nil or username:match("%W") then
112 return nil
113 end
114
115 local who = "uid=" .. username .. ",ou=devs,dc=gentoo,dc=org"
116
117 local ldap, err = lualdap.open_simple {
118 uri = "ldap://ldap1.gentoo.org",
119 who = who,
120 password = password,
121 starttls = true,
122 certfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.crt",
123 keyfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.key",
124 cacertfile = "/var/www/uwsgi/cgit/gentoo-ldap/ca.pem"
125 }
126 if ldap == nil then
127 return nil
128 end
129
130 local group_suffix = ".group"
131 local group_suffix_len = group_suffix:len()
132 local groups = {}
133 for dn, attribs in ldap:search { base = who, scope = "subtree" } do
134 local access = attribs["gentooAccess"]
135 if dn == who and access ~= nil then
136 for i, v in ipairs(access) do
137 local vlen = v:len()
138 if vlen > group_suffix_len and v:sub(-group_suffix_len) == group_suffix then
139 table.insert(groups, v:sub(1, vlen - group_suffix_len))
140 end
141 end
142 end
143 end
144
145 ldap:close()
146
147 return groups
148end
149
150--
151--
152-- Wrapper around filter API, exposing the http table, the cgit table, and the post table to the above functions.
153--
154--
155
156local actions = {}
157actions["authenticate-post"] = authenticate_post
158actions["authenticate-cookie"] = authenticate_cookie
159actions["body"] = body
160
161function filter_open(...)
162 action = actions[select(1, ...)]
163
164 http = {}
165 http["cookie"] = select(2, ...)
166 http["method"] = select(3, ...)
167 http["query"] = select(4, ...)
168 http["referer"] = select(5, ...)
169 http["path"] = select(6, ...)
170 http["host"] = select(7, ...)
171 http["https"] = select(8, ...)
172
173 cgit = {}
174 cgit["repo"] = select(9, ...)
175 cgit["page"] = select(10, ...)
176 cgit["url"] = select(11, ...)
177 cgit["login"] = select(12, ...)
178
179end
180
181function filter_close()
182 return action()
183end
184
185function filter_write(str)
186 post = parse_qs(str)
187end
188
189
190--
191--
192-- Utility functions based on keplerproject/wsapi.
193--
194--
195
196function url_decode(str)
197 if not str then
198 return ""
199 end
200 str = string.gsub(str, "+", " ")
201 str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
202 str = string.gsub(str, "\r\n", "\n")
203 return str
204end
205
206function url_encode(str)
207 if not str then
208 return ""
209 end
210 str = string.gsub(str, "\n", "\r\n")
211 str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
212 str = string.gsub(str, " ", "+")
213 return str
214end
215
216function parse_qs(qs)
217 local tab = {}
218 for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
219 tab[url_decode(key)] = url_decode(val)
220 end
221 return tab
222end
223
224function get_cookie(cookies, name)
225 cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
226 return string.match(cookies, ";" .. name .. "=(.-);")
227end
228
229function tohex(b)
230 local x = ""
231 for i = 1, #b do
232 x = x .. string.format("%.2x", string.byte(b, i))
233 end
234 return x
235end
236
237--
238--
239-- Cookie construction and validation helpers.
240--
241--
242
243local secret = nil
244
245-- Loads a secret from a file, creates a secret, or returns one from memory.
246function get_secret()
247 if secret ~= nil then
248 return secret
249 end
250 local secret_file = io.open(secret_filename, "r")
251 if secret_file == nil then
252 local old_umask = sysstat.umask(63)
253 local temporary_filename = secret_filename .. ".tmp." .. tohex(rand.bytes(16))
254 local temporary_file = io.open(temporary_filename, "w")
255 if temporary_file == nil then
256 os.exit(177)
257 end
258 temporary_file:write(tohex(rand.bytes(32)))
259 temporary_file:close()
260 unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
261 unistd.unlink(temporary_filename)
262 sysstat.umask(old_umask)
263 secret_file = io.open(secret_filename, "r")
264 end
265 if secret_file == nil then
266 os.exit(177)
267 end
268 secret = secret_file:read()
269 secret_file:close()
270 if secret:len() ~= 64 then
271 os.exit(177)
272 end
273 return secret
274end
275
276-- Returns value of cookie if cookie is valid. Otherwise returns nil.
277function validate_value(expected_field, cookie)
278 local i = 0
279 local value = ""
280 local field = ""
281 local expiration = 0
282 local salt = ""
283 local chmac = ""
284
285 if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
286 return nil
287 end
288
289 for component in string.gmatch(cookie, "[^|]+") do
290 if i == 0 then
291 field = component
292 elseif i == 1 then
293 value = component
294 elseif i == 2 then
295 expiration = tonumber(component)
296 if expiration == nil then
297 expiration = -1
298 end
299 elseif i == 3 then
300 salt = component
301 elseif i == 4 then
302 chmac = component
303 else
304 break
305 end
306 i = i + 1
307 end
308
309 if chmac == nil or chmac:len() == 0 then
310 return nil
311 end
312
313 -- Lua hashes strings, so these comparisons are time invariant.
314 if chmac ~= tohex(hmac.new(get_secret(), "sha256"):final(field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt)) then
315 return nil
316 end
317
318 if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then
319 return nil
320 end
321
322 if url_decode(field) ~= expected_field then
323 return nil
324 end
325
326 return url_decode(value)
327end
328
329function secure_value(field, value, expiration)
330 if value == nil or value:len() <= 0 then
331 return ""
332 end
333
334 local authstr = ""
335 local salt = tohex(rand.bytes(16))
336 value = url_encode(value)
337 field = url_encode(field)
338 authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
339 authstr = authstr .. "|" .. tohex(hmac.new(get_secret(), "sha256"):final(authstr))
340 return authstr
341end
342
343function set_cookie(cookie, value)
344 html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly")
345 if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
346 html("; secure")
347 end
348 html("\n")
349end
350
351function redirect_to(url)
352 html("Status: 302 Redirect\n")
353 html("Cache-Control: no-cache, no-store\n")
354 html("Location: " .. url .. "\n")
355end
356
357function not_found()
358 html("Status: 404 Not Found\n")
359 html("Cache-Control: no-cache, no-store\n\n")
360end
diff --git a/filters/owner-example.lua b/filters/owner-example.lua deleted file mode 100644 index 50fc25a..0000000 --- a/filters/owner-example.lua +++ /dev/null
@@ -1,17 +0,0 @@
1-- This script is an example of an owner-filter. It replaces the
2-- usual query link with one to a fictional homepage. This script may
3-- be used with the owner-filter or repo.owner-filter settings in
4-- cgitrc with the `lua:` prefix.
5
6function filter_open()
7 buffer = ""
8end
9
10function filter_close()
11 html(string.format("<a href=\"%s\">%s</a>", "http://wiki.example.com/about/" .. buffer, buffer))
12 return 0
13end
14
15function filter_write(str)
16 buffer = buffer .. str
17end
diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua deleted file mode 100644 index 23d3457..0000000 --- a/filters/simple-authentication.lua +++ /dev/null
@@ -1,314 +0,0 @@
1-- This script may be used with the auth-filter. Be sure to configure it as you wish.
2--
3-- Requirements:
4-- luaossl
5-- <http://25thandclement.com/~william/projects/luaossl.html>
6-- luaposix
7-- <https://github.com/luaposix/luaposix>
8--
9local sysstat = require("posix.sys.stat")
10local unistd = require("posix.unistd")
11local rand = require("openssl.rand")
12local hmac = require("openssl.hmac")
13
14--
15--
16-- Configure these variables for your settings.
17--
18--
19
20-- A list of password protected repositories along with the users who can access them.
21local protected_repos = {
22 glouglou = { laurent = true, jason = true },
23 qt = { jason = true, bob = true }
24}
25
26-- A list of users and hashes, generated with `mkpasswd -m sha-512 -R 300000`.
27local users = {
28 jason = "$6$rounds=300000$YYJct3n/o.ruYK$HhpSeuCuW1fJkpvMZOZzVizeLsBKcGA/aF2UPuV5v60JyH2MVSG6P511UMTj2F3H75.IT2HIlnvXzNb60FcZH1",
29 laurent = "$6$rounds=300000$dP0KNHwYb3JKigT$pN/LG7rWxQ4HniFtx5wKyJXBJUKP7R01zTNZ0qSK/aivw8ywGAOdfYiIQFqFhZFtVGvr11/7an.nesvm8iJUi.",
30 bob = "$6$rounds=300000$jCLCCt6LUpTz$PI1vvd1yaVYcCzqH8QAJFcJ60b6W/6sjcOsU7mAkNo7IE8FRGW1vkjF8I/T5jt/auv5ODLb1L4S2s.CAyZyUC"
31}
32
33-- Set this to a path this script can write to for storing a persistent
34-- cookie secret, which should be guarded.
35local secret_filename = "/var/cache/cgit/auth-secret"
36
37--
38--
39-- Authentication functions follow below. Swap these out if you want different authentication semantics.
40--
41--
42
43-- Sets HTTP cookie headers based on post and sets up redirection.
44function authenticate_post()
45 local hash = users[post["username"]]
46 local redirect = validate_value("redirect", post["redirect"])
47
48 if redirect == nil then
49 not_found()
50 return 0
51 end
52
53 redirect_to(redirect)
54
55 if hash == nil or hash ~= unistd.crypt(post["password"], hash) then
56 set_cookie("cgitauth", "")
57 else
58 -- One week expiration time
59 local username = secure_value("username", post["username"], os.time() + 604800)
60 set_cookie("cgitauth", username)
61 end
62
63 html("\n")
64 return 0
65end
66
67
68-- Returns 1 if the cookie is valid and 0 if it is not.
69function authenticate_cookie()
70 accepted_users = protected_repos[cgit["repo"]]
71 if accepted_users == nil then
72 -- We return as valid if the repo is not protected.
73 return 1
74 end
75
76 local username = validate_value("username", get_cookie(http["cookie"], "cgitauth"))
77 if username == nil or not accepted_users[username:lower()] then
78 return 0
79 else
80 return 1
81 end
82end
83
84-- Prints the html for the login form.
85function body()
86 html("<h2>Authentication Required</h2>")
87 html("<form method='post' action='")
88 html_attr(cgit["login"])
89 html("'>")
90 html("<input type='hidden' name='redirect' value='")
91 html_attr(secure_value("redirect", cgit["url"], 0))
92 html("' />")
93 html("<table>")
94 html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
95 html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
96 html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
97 html("</table></form>")
98
99 return 0
100end
101
102
103
104--
105--
106-- Wrapper around filter API, exposing the http table, the cgit table, and the post table to the above functions.
107--
108--
109
110local actions = {}
111actions["authenticate-post"] = authenticate_post
112actions["authenticate-cookie"] = authenticate_cookie
113actions["body"] = body
114
115function filter_open(...)
116 action = actions[select(1, ...)]
117
118 http = {}
119 http["cookie"] = select(2, ...)
120 http["method"] = select(3, ...)
121 http["query"] = select(4, ...)
122 http["referer"] = select(5, ...)
123 http["path"] = select(6, ...)
124 http["host"] = select(7, ...)
125 http["https"] = select(8, ...)
126
127 cgit = {}
128 cgit["repo"] = select(9, ...)
129 cgit["page"] = select(10, ...)
130 cgit["url"] = select(11, ...)
131 cgit["login"] = select(12, ...)
132
133end
134
135function filter_close()
136 return action()
137end
138
139function filter_write(str)
140 post = parse_qs(str)
141end
142
143
144--
145--
146-- Utility functions based on keplerproject/wsapi.
147--
148--
149
150function url_decode(str)
151 if not str then
152 return ""
153 end
154 str = string.gsub(str, "+", " ")
155 str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
156 str = string.gsub(str, "\r\n", "\n")
157 return str
158end
159
160function url_encode(str)
161 if not str then
162 return ""
163 end
164 str = string.gsub(str, "\n", "\r\n")
165 str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
166 str = string.gsub(str, " ", "+")
167 return str
168end
169
170function parse_qs(qs)
171 local tab = {}
172 for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
173 tab[url_decode(key)] = url_decode(val)
174 end
175 return tab
176end
177
178function get_cookie(cookies, name)
179 cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
180 return url_decode(string.match(cookies, ";" .. name .. "=(.-);"))
181end
182
183function tohex(b)
184 local x = ""
185 for i = 1, #b do
186 x = x .. string.format("%.2x", string.byte(b, i))
187 end
188 return x
189end
190
191--
192--
193-- Cookie construction and validation helpers.
194--
195--
196
197local secret = nil
198
199-- Loads a secret from a file, creates a secret, or returns one from memory.
200function get_secret()
201 if secret ~= nil then
202 return secret
203 end
204 local secret_file = io.open(secret_filename, "r")
205 if secret_file == nil then
206 local old_umask = sysstat.umask(63)
207 local temporary_filename = secret_filename .. ".tmp." .. tohex(rand.bytes(16))
208 local temporary_file = io.open(temporary_filename, "w")
209 if temporary_file == nil then
210 os.exit(177)
211 end
212 temporary_file:write(tohex(rand.bytes(32)))
213 temporary_file:close()
214 unistd.link(temporary_filename, secret_filename) -- Intentionally fails in the case that another process is doing the same.
215 unistd.unlink(temporary_filename)
216 sysstat.umask(old_umask)
217 secret_file = io.open(secret_filename, "r")
218 end
219 if secret_file == nil then
220 os.exit(177)
221 end
222 secret = secret_file:read()
223 secret_file:close()
224 if secret:len() ~= 64 then
225 os.exit(177)
226 end
227 return secret
228end
229
230-- Returns value of cookie if cookie is valid. Otherwise returns nil.
231function validate_value(expected_field, cookie)
232 local i = 0
233 local value = ""
234 local field = ""
235 local expiration = 0
236 local salt = ""
237 local chmac = ""
238
239 if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then
240 return nil
241 end
242
243 for component in string.gmatch(cookie, "[^|]+") do
244 if i == 0 then
245 field = component
246 elseif i == 1 then
247 value = component
248 elseif i == 2 then
249 expiration = tonumber(component)
250 if expiration == nil then
251 expiration = -1
252 end
253 elseif i == 3 then
254 salt = component
255 elseif i == 4 then
256 chmac = component
257 else
258 break
259 end
260 i = i + 1
261 end
262
263 if chmac == nil or chmac:len() == 0 then
264 return nil
265 end
266
267 -- Lua hashes strings, so these comparisons are time invariant.
268 if chmac ~= tohex(hmac.new(get_secret(), "sha256"):final(field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt)) then
269 return nil
270 end
271
272 if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then
273 return nil
274 end
275
276 if url_decode(field) ~= expected_field then
277 return nil
278 end
279
280 return url_decode(value)
281end
282
283function secure_value(field, value, expiration)
284 if value == nil or value:len() <= 0 then
285 return ""
286 end
287
288 local authstr = ""
289 local salt = tohex(rand.bytes(16))
290 value = url_encode(value)
291 field = url_encode(field)
292 authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt
293 authstr = authstr .. "|" .. tohex(hmac.new(get_secret(), "sha256"):final(authstr))
294 return authstr
295end
296
297function set_cookie(cookie, value)
298 html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly")
299 if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
300 html("; secure")
301 end
302 html("\n")
303end
304
305function redirect_to(url)
306 html("Status: 302 Redirect\n")
307 html("Cache-Control: no-cache, no-store\n")
308 html("Location: " .. url .. "\n")
309end
310
311function not_found()
312 html("Status: 404 Not Found\n")
313 html("Cache-Control: no-cache, no-store\n\n")
314end
© 2022 C. Duckworth. generated by cgit. comments, issues, and patches welcome at < git at acdw dot net >.