├── .github
├── ISSUE_TEMPLATE
│ ├── bug_report.md
│ └── feature_request.md
└── workflows
│ └── CI.yml
├── CONTRIBUTING.md
├── LICENSE
├── README.md
├── SiteShield.lua
└── docs
└── siteshield.svg
/.github/ISSUE_TEMPLATE/bug_report.md:
--------------------------------------------------------------------------------
1 | ---
2 | name: Bug report
3 | about: Create a report to help us improve
4 | title: ''
5 | labels: ''
6 | assignees: ''
7 |
8 | ---
9 |
10 | **Describe the bug**
11 | A clear and concise description of what the bug is.
12 |
13 | **To Reproduce**
14 | Steps to reproduce the behavior:
15 | 1. Go to '...'
16 | 2. Click on '....'
17 | 3. Scroll down to '....'
18 | 4. See error
19 |
20 | **Expected behavior**
21 | A clear and concise description of what you expected to happen.
22 |
23 | **Screenshots**
24 | If applicable, add screenshots to help explain your problem.
25 |
26 | **Desktop (please complete the following information):**
27 | - OS: [e.g. iOS]
28 | - Browser [e.g. chrome, safari]
29 | - Version [e.g. 22]
30 |
31 | **Smartphone (please complete the following information):**
32 | - Device: [e.g. iPhone6]
33 | - OS: [e.g. iOS8.1]
34 | - Browser [e.g. stock browser, safari]
35 | - Version [e.g. 22]
36 |
37 | **Additional context**
38 | Add any other context about the problem here.
39 |
--------------------------------------------------------------------------------
/.github/ISSUE_TEMPLATE/feature_request.md:
--------------------------------------------------------------------------------
1 | ---
2 | name: Feature request
3 | about: Suggest an idea for this project
4 | title: ''
5 | labels: ''
6 | assignees: ''
7 |
8 | ---
9 |
10 | **Is your feature request related to a problem? Please describe.**
11 | A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
12 |
13 | **Describe the solution you'd like**
14 | A clear and concise description of what you want to happen.
15 |
16 | **Describe alternatives you've considered**
17 | A clear and concise description of any alternative solutions or features you've considered.
18 |
19 | **Additional context**
20 | Add any other context or screenshots about the feature request here.
21 |
--------------------------------------------------------------------------------
/.github/workflows/CI.yml:
--------------------------------------------------------------------------------
1 | name: CI
2 | on:
3 | push:
4 | branches: [ main ]
5 | pull_request:
6 | branches: [ main ]
7 | workflow_dispatch:
8 | jobs:
9 | build:
10 | runs-on: ubuntu-latest
11 | steps:
12 | - name: luacheck
13 | uses: nebularg/actions-luacheck@v1.1.0
14 | with:
15 | args: '-qo 011'
16 |
--------------------------------------------------------------------------------
/CONTRIBUTING.md:
--------------------------------------------------------------------------------
1 | # Contributing
2 |
3 | When contributing to this repository, please first discuss the change you wish to make via issue,
4 | email, or any other method with the owners of this repository before making a change.
5 |
6 | Please note we have a code of conduct, please follow it in all your interactions with the project.
7 |
8 | ## Pull Request Process
9 |
10 | 1. Ensure any install or build dependencies are removed before the end of the layer when doing a
11 | build.
12 | 2. Update the README.md with details of changes to the interface, this includes new environment
13 | variables, exposed ports, useful file locations and container parameters.
14 |
15 | ## Code of Conduct
16 |
17 | ### Our Pledge
18 |
19 | In the interest of fostering an open and welcoming environment, we as
20 | contributors and maintainers pledge to making participation in our project and
21 | our community a harassment-free experience for everyone, regardless of age, body
22 | size, disability, ethnicity, gender identity and expression, level of experience,
23 | nationality, personal appearance, race, religion, or sexual identity and
24 | orientation.
25 |
26 | ### Our Standards
27 |
28 | Examples of behavior that contributes to creating a positive environment
29 | include:
30 |
31 | * Using welcoming and inclusive language
32 | * Being respectful of differing viewpoints and experiences
33 | * Gracefully accepting constructive criticism
34 | * Focusing on what is best for the community
35 | * Showing empathy towards other community members
36 |
37 | Examples of unacceptable behavior by participants include:
38 |
39 | * The use of sexualized language or imagery and unwelcome sexual attention or
40 | advances
41 | * Trolling, insulting/derogatory comments, and personal or political attacks
42 | * Public or private harassment
43 | * Publishing others' private information, such as a physical or electronic
44 | address, without explicit permission
45 | * Other conduct which could reasonably be considered inappropriate in a
46 | professional setting
47 |
48 | ### Our Responsibilities
49 |
50 | Project maintainers are responsible for clarifying the standards of acceptable
51 | behavior and are expected to take appropriate and fair corrective action in
52 | response to any instances of unacceptable behavior.
53 |
54 | Project maintainers have the right and responsibility to remove, edit, or
55 | reject comments, commits, code, wiki edits, issues, and other contributions
56 | that are not aligned to this Code of Conduct, or to ban temporarily or
57 | permanently any contributor for other behaviors that they deem inappropriate,
58 | threatening, offensive, or harmful.
59 |
60 | ### Scope
61 |
62 | This Code of Conduct applies both within project spaces and in public spaces
63 | when an individual is representing the project or its community. Examples of
64 | representing a project or community include using an official project e-mail
65 | address, posting via an official social media account, or acting as an appointed
66 | representative at an online or offline event. Representation of a project may be
67 | further defined and clarified by project maintainers.
68 |
69 | ### Enforcement
70 |
71 | Instances of abusive, harassing, or otherwise unacceptable behavior may be
72 | reported by contacting the project team at [INSERT EMAIL ADDRESS]. All
73 | complaints will be reviewed and investigated and will result in a response that
74 | is deemed necessary and appropriate to the circumstances. The project team is
75 | obligated to maintain confidentiality with regard to the reporter of an incident.
76 | Further details of specific enforcement policies may be posted separately.
77 |
78 | Project maintainers who do not follow or enforce the Code of Conduct in good
79 | faith may face temporary or permanent repercussions as determined by other
80 | members of the project's leadership.
81 |
82 | ### Attribution
83 |
84 | This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
85 | available at [http://contributor-covenant.org/version/1/4][version]
86 |
87 | [homepage]: http://contributor-covenant.org
88 | [version]: http://contributor-covenant.org/version/1/4/
89 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | GNU GENERAL PUBLIC LICENSE
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674 | .
675 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 |
2 |
3 |
SiteShield OpenResty
4 |
Advanced Layer 7 HTTP(s) DDoS Mitigation module for OpenResty ("dynamic web platform based on NGINX and LuaJIT")
5 |
6 |
7 |
8 |
9 |
10 | ## Features
11 |
12 | * **Layer 7 DDoS Mitigation** via JavaScript Challenge.
13 | * Firewall
14 | * Allow IP Address (Bypass JavaScript Challenge)
15 | * Block IP Address
16 | * Allow URI (Bypass JavaScript Challenge)
17 | * Block URI
18 | * SEO Optimised (Popular Search Engines Bypass JavaScript Challenge)
19 | * Variable Challenge Authentication Time Window
20 | * Variable Rate limit on Served Challenges
21 |
22 | ## Coming Soon
23 |
24 | * Google Recaptcha Challenge
25 | * Invisible JavaScript Challenge
26 | * On Detection Mitigation (currently Always On)
27 | * Automatic Installer Script (Requires Fresh/Vanilla Install)
28 |
29 |
30 | ## Getting Started
31 |
32 | Below we will go through installing SiteShield-OpenResty on a CentOS 7.9.2009 (Core) linux server, from zero to a fully fledged HTTP reverse proxy, with Layer 7 DDoS Mitigation.
33 |
34 |
35 | ## Prerequisites
36 |
37 | You'll need to install a few dependencies that SiteShield-OpenResty utilises.
38 |
39 | ```
40 | yum install gcc ipset iptables bind-utils -y
41 | ```
42 |
43 | ### OpenResty
44 |
45 | ```
46 | wget https://openresty.org/package/centos/openresty.repo
47 | sudo mv openresty.repo /etc/yum.repos.d/
48 | yum check-update
49 | yum install openresty -y
50 | useradd -r nginx
51 | ```
52 |
53 |
54 | ### Redis
55 |
56 | First, install redis server:
57 |
58 | ```
59 | yum install epel-release -y
60 | yum install redis -y
61 | ```
62 |
63 |
64 | ### Sockproc
65 |
66 | ```
67 | wget https://raw.githubusercontent.com/dbContext/sockproc/master/sockproc.c
68 | gcc sockproc.c -o sockproc
69 | ./sockproc /tmp/shell.sock
70 | chmod +x /tmp/shell.sock
71 | ```
72 |
73 |
74 | ### Shell
75 |
76 | ```
77 | mkdir /usr/local/openresty/lualib/resty/lua-resty-shell
78 | wget https://raw.githubusercontent.com/dbContext/lua-resty-shell/master/lib/resty/shell.lua
79 | mv shell.lua /usr/local/openresty/lualib/resty/lua-resty-shell
80 | ```
81 |
82 |
83 | ## Configuring Network Firewall
84 |
85 | By dropping the IP address at the network interface, we're removing the overhead of OpenResty (CPU) processing the bad requests - greatly improving mitigation throughput.
86 |
87 | ```
88 | ipset create siteshield-droplist hash:ip hashsize 4096
89 |
90 | iptables -I INPUT -m set --match-set siteshield-droplist src -j DROP
91 | iptables -I FORWARD -m set --match-set siteshield-droplist src -j DROP
92 | ```
93 |
94 |
95 | ## Installing SiteShield
96 |
97 | First, download `SiteShield.lua` to the relevant OpenResty/Nginx Directory.
98 |
99 | ```
100 | wget https://raw.githubusercontent.com/dbContext/SiteShield-OpenResty/main/SiteShield.lua
101 | mv SiteShield.lua /usr/local/openresty/nginx/conf
102 | ```
103 |
104 | Lastly, you'll now want to alter your nginx.conf, to utilise `SiteShield.lua`.
105 |
106 | ```
107 | ...
108 | server {
109 |
110 | ...
111 |
112 | set $auth_time '86400'; # Time User is Authenticated after Challenge in seconds.
113 | set $allow_ip ''; # format: 1.1.1.1;2.2.2.2;3.3.3.3
114 | set $block_ip ''; # format: 4.4.4.4;5.5.5.5;6.6.6.6
115 | set $allow_uri ''; # format: /allow-this-uri;/also/allow/this/uri
116 | set $block_uri ''; # format: /block-this-uri;/also/block/this/uri
117 | set $max_failed_challenge_attempts '5'; # Max Failed Challenge Attempts before IP block.
118 | set $max_time_window_challenges '120'; # Max Challenges Served in Time Window (e.g. 5 Challenges with in 120 seconds.)
119 |
120 | location / {
121 | content_by_lua_file /usr/local/openresty/nginx/conf/SiteShield.lua;
122 | }
123 |
124 | error_page 555 = @backend;
125 |
126 | location @backend {
127 | proxy_set_header Host $host;
128 | proxy_set_header SiteShield-Real-IP $remote_addr;
129 | proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
130 | proxy_http_version 1.1;
131 | proxy_set_header Connection '';
132 | proxy_redirect off;
133 | proxy_buffering off;
134 | proxy_pass http://google.com;
135 | }
136 | }
137 | ...
138 | ```
139 |
140 |
141 | ## Ready to go!
142 |
143 | If everything above went as expected, after restarting the relevant services (commands below), you'll have a HTTP Reverse Proxy with Layer 7 DDoS Mitigation.
144 |
145 | ```
146 | service redis restart
147 | service openresty restart
148 | ```
149 |
150 | ## Contributing
151 |
152 | Please read [CONTRIBUTING](CONTRIBUTING.md) for details on our code of conduct, and the process for submitting pull requests to us.
153 |
154 |
155 | ## Authors
156 |
157 | * **[dbContext](https://github.com/dbContext)** - *Initial work*
158 |
159 | See also the list of [contributors](https://github.com/dbContext/SiteShield-OpenResty/contributors) who participated in this project.
160 |
161 |
162 | ## License
163 |
164 | This project is licensed under the GPL-3.0 License - see the [LICENSE](LICENSE) file for details
165 |
166 |
167 | ## Acknowledgments
168 |
169 | * **[openresty](https://github.com/openresty/openresty)**
170 | * **[redis](https://github.com/redis/redis)**
171 | * **[lua-resty-shell](https://github.com/juce/lua-resty-shell)**
172 | * **[sockproc](https://github.com/juce/sockproc)**
173 |
--------------------------------------------------------------------------------
/SiteShield.lua:
--------------------------------------------------------------------------------
1 | local redis = require "resty.redis"
2 | local resty_sha1 = require "resty.sha1"
3 | local str = require "resty.string"
4 | local shell = require "resty.lua-resty-shell.shell"
5 |
6 | local remote_ip = ngx.var.remote_addr
7 | local domain = ngx.var.host
8 | local useragent = ngx.req.get_headers()['User-Agent']
9 | if useragent == nil then
10 | useragent = "nilua"
11 | end
12 | local uri = ngx.var.request_uri
13 | local auth = 0
14 | local timestamp = 0
15 | local question = 0
16 | local answer = 0
17 |
18 | local sha1 = resty_sha1:new()
19 | local str_hash = sha1:update(remote_ip .. domain .. useragent)
20 | local digest = sha1:final()
21 | local usr_hash = str.to_hex(digest)
22 |
23 | local math_random = math.random
24 | local math_floor = math.floor
25 | local string_gmatch = string.gmatch
26 | local string_find = string.find
27 | local string_sub = string.sub
28 | local string_gsub = string.gsub
29 | local string_char = string.char
30 |
31 | local maxFailedChallengeAttempts = ngx.var.max_failed_challenge_attempts
32 | local maxTimeWindowChallenges = ngx.var.max_time_window_challenges
33 |
34 | local red = redis:new()
35 | local ok, err = red:connect("127.0.0.1", 6379)
36 | if not ok then
37 | ngx.header["Content-type"] = "text/html"
38 | ngx.say("failed to connect to redis, please reload to try again.")
39 | return
40 | end
41 |
42 | local shellSockArgs = { socket = "unix:/tmp/shell.sock" }
43 |
44 | function GENINT()
45 | local randloop = math_random(10)
46 | local genplace
47 | local genanswer = 0
48 | local genstring = ""
49 | local tabbed = ""
50 | local spaced = ""
51 | for i = 0, randloop do
52 | genplace = 0;
53 | local genint = math_floor(math_random(15))
54 | genanswer = genanswer + genint
55 | while genplace ~= genint do
56 | genplace = genplace + 1
57 | if (math_random(9) > math_random(9)) then
58 | genstring = genstring .. "+(" .. GEN(1) .. ")"
59 | else
60 | local randlooptab = math_floor(math_random(2))
61 | for i = 0, randlooptab do
62 | tabbed = tabbed .. " "
63 | end
64 | local randloopspace = math_floor(math_random(2))
65 | for i = 0, randloopspace do
66 | spaced = spaced .. " "
67 | end
68 | genstring = genstring .. "+(" .. GEN(1) .. ")" .. tabbed .. spaced
69 | end
70 | end
71 | end
72 | return genstring, genanswer
73 | end
74 |
75 | function GEN(id)
76 | local gen = "";
77 | if id == 1 then
78 | local count = math_floor(math_random(2))
79 | local randcount = math_floor(math_random(count))
80 | for i = 1, count do
81 | local rand = math_floor(math_random(3))
82 | if (i == randcount) then
83 | if (rand == 1) then
84 | gen = gen .. "+(" .. math_random(99) + 55 .. " > " .. math_random(34) + 10 .. ")"
85 | end
86 | if (rand == 2) then
87 | gen = gen .. "+(" .. math_random(74) + 5 .. " < " .. math_random(44) + 85 .. ")"
88 | end
89 | if (rand == 3) then
90 | local randint = math_random(149) + 30
91 | gen = gen .. "+(" .. randint .. " == " .. randint .. ")"
92 | end
93 | else
94 | if (rand == 1) then
95 | gen = gen .. "+(" .. math_random(34) + 15 .. " > " .. math_random(64) + 65 .. ")"
96 | end
97 | if (rand == 2) then
98 | gen = gen .. "+(" .. math_random(74) + 55 .. " < " .. math_random(14) + 25 .. ")"
99 | end
100 | if (rand == 3) then
101 | gen = gen .. "+(" .. math_random(74) + 55 .. " == " .. math_random(14) + 24 .. ")"
102 | end
103 | end
104 | end
105 | else
106 | local count = math_floor(math_random(9))
107 | for i = 0, count do
108 | local rand = math_floor(math_random(3))
109 | if (rand == 1) then
110 | gen = gen .. "+(" .. math_random(34) + 15 .. " > " .. math_random(64) + 55 .. ")"
111 | end
112 | if (rand == 2) then
113 | gen = gen .. "+(" .. math_random(74) + 45 .. " < " .. math_random(14) + 25 .. ")"
114 | end
115 | if (rand == 3) then
116 | gen = gen .. "+(" .. math_floor(math_random(74) + 35) .. " == " .. math_floor(math_random(14) + 24) .. ")"
117 | end
118 | end
119 | end
120 | return gen
121 | end
122 |
123 | function genString(l)
124 | local s = ""
125 | for i = 1, l do
126 | s = s .. string_char(math_random(97, 122))
127 | end
128 | return s
129 | end
130 |
131 | function CHALLENGE()
132 |
133 | if (string_find(useragent, "WordPress")) then
134 | shell.execute("ipset add siteshield-droplist " .. remote_ip, shellSockArgs)
135 | red:close()
136 | ngx.header["Content-type"] = "text/html"
137 | ngx.exit(444)
138 | return
139 | end
140 |
141 | if (string_find(useragent, "Googlebot") or
142 | string_find(useragent, "bingbot") or
143 | string_find(useragent, "Yahoo") or
144 | string_find(useragent, "DuckDuckBot")) then
145 |
146 | local getHostname = io.popen("dig -x " .. remote_ip .. " +short")
147 | local resolvedHostname = getHostname:read("*a")
148 | getHostname:close()
149 |
150 | local getIP = io.popen("getent hosts " .. resolvedHostname)
151 | local resolvedIP = getIP:read("*a")
152 | getIP:close()
153 |
154 | if (string_find(resolvedHostname, "google.com") or
155 | string_find(resolvedHostname, "googlebot.com") or
156 | string_find(resolvedHostname, "search.msn.com") or
157 | string_find(resolvedHostname, "crawl.yahoo.net") or
158 | string_find(resolvedHostname, "duckduckbot.duckduckgo.com")) then
159 |
160 | if (string_find(resolvedIP, remote_ip)) then
161 |
162 | red:hmset(usr_hash, "auth", 1, "timestamp", os.time() + 7200, "question", 0, "answer", 0, "hitcount", 0, "hitcounttimestamp", 0, "questionarg", 0, "answerarg", 0)
163 | red:persist(usr_hash)
164 | red:close()
165 |
166 | ngx.header["Content-type"] = "text/html"
167 | ngx.exit(555)
168 |
169 | return
170 |
171 | end
172 |
173 | end
174 |
175 | red:close()
176 | ngx.header["Content-type"] = "text/html"
177 | ngx.exit(444)
178 | return
179 |
180 | end
181 |
182 | local res, err = red:hmget(usr_hash, "hitcount", "hitcounttimestamp")
183 | local hitcount = res[1]
184 | local timestamp = res[2]
185 |
186 | if tonumber(hitcount) == 0 then
187 | red:hmset(usr_hash, "hitcount", 1, "hitcounttimestamp", os.time())
188 | else
189 | red:hincrby(usr_hash, "hitcount", 1)
190 | if (tonumber(hitcount) >= tonumber(maxFailedChallengeAttempts)) then
191 | local diff = os.time() - timestamp
192 | if (tonumber(diff) <= tonumber(maxTimeWindowChallenges)) then
193 | shell.execute("ipset add siteshield-droplist " .. remote_ip, shellSockArgs)
194 | red:close()
195 | ngx.header["Content-type"] = "text/html"
196 | ngx.exit(444)
197 | return
198 | end
199 | if (tonumber(diff) >= tonumber(maxTimeWindowChallenges)) then
200 | red:hmset(usr_hash, "hitcount", 0, "hitcounttimestamp", 0)
201 | end
202 | end
203 | end
204 |
205 | local jsvar = genString(math_random(15))
206 | local question = genString(math_random(30))
207 | local randloop = math_random(5)
208 | local buff = 0
209 | local answertotal = 0
210 | local jstotal = ""
211 | local jstype
212 |
213 | for i = 0, tonumber(randloop) do
214 | local js, jsanswer = GENINT()
215 | if (buff == 0) then
216 | jstotal = jstotal .. "var " .. jsvar .. " = " .. js .. ";"
217 | answertotal = jsanswer
218 | buff = buff + 1
219 | else
220 | local randtype = math_floor(math_random(4))
221 | if (randtype == 1) then
222 | answertotal = answertotal + jsanswer
223 | jstype = "+"
224 | end
225 | if (randtype == 2) then
226 | answertotal = answertotal - jsanswer
227 | jstype = "-"
228 | end
229 | if (randtype == 3) then
230 | answertotal = answertotal * jsanswer
231 | jstype = "*"
232 | end
233 | if (randtype == 4) then
234 | answertotal = answertotal / jsanswer
235 | jstype = "/"
236 | end
237 | jstotal = jstotal .. jsvar .. jstype .. "= " .. js .. ";"
238 | end
239 | end
240 |
241 | if (string_find(answertotal, "0.")) then
242 | local forceRange = math_floor(math_random(51))
243 | jstotal = jstotal .. jsvar .. " += " .. forceRange .. ";"
244 | answertotal = answertotal + forceRange
245 | end
246 |
247 | local stringsub = math_floor(math_random(10))
248 | answertotal = string_sub(answertotal, 0, stringsub)
249 | local reloadtime = math_random(4) * 1000
250 | local expectedAuthenticationTime = math_random(2, 5) * 1000
251 |
252 | red:hmset(usr_hash, "question", question, "answer", answertotal, "eAT", expectedAuthenticationTime, "eATTime", os.time())
253 | red:close()
254 |
255 | local func_name = genString(math_random(32))
256 | local response = "DDoS Protection by SiteShield
3 | 
8 |