├── .github └── FUNDING.yml ├── .gitignore ├── BappDescription.html ├── BappManifest.bmf ├── LICENSE ├── README.md ├── build.gradle ├── images ├── GA-rule.png ├── configuration-1.png ├── configuration-2.png └── session-tracer.png └── src ├── main └── java │ ├── burp │ ├── BurpExtender.java │ └── SessionHandlingAction.java │ └── googleauthenticator │ ├── gui │ └── Tab.java │ └── utils │ └── DataSet.java └── test └── resources └── log4j.properties /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: aress31 4 | patreon: # Replace with a single Patreon username 5 | open_collective: # Replace with a single Open Collective username 6 | ko_fi: # Replace with a single Ko-fi username 7 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel 8 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry 9 | liberapay: # Replace with a single Liberapay username 10 | issuehunt: # Replace with a single IssueHunt username 11 | otechie: # Replace with a single Otechie username 12 | custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2'] 13 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | build/ 2 | *.swp 3 | .classpath 4 | .gradle/ 5 | .idea/workspace.xml 6 | .project 7 | .settings/ 8 | .vscode/ 9 | bin/ 10 | .idea/ -------------------------------------------------------------------------------- /BappDescription.html: -------------------------------------------------------------------------------- 1 |

2 | This Burp Suite extension turns Burp into a Google Authenticator client. The 3 | current Google Two-Factor Authentication (2FA) code is automatically computed 4 | from a given shared secret and applied to bespoke location(s) in relevant 5 | requests in real-time. 6 |

7 | 8 |

Instructions:

9 |
    10 |
  1. 11 | Input the shared secret used by the Time-based One-Time Password 12 | (TOTP) algorithm into Google Authenticator. 13 |
    2. 14 |
  2. 15 | Input the (regular) expression to match and replace in issued request(s) 16 | into Google Authenticator. Use the regex 17 | (?<![\w\d])\d{6,8}(?![\w\d]) for optimal results as Google 2FA 18 | codes are made up of 6 to 8 digits according to the relevant RFCs. 19 |
    3. 20 |
  3. 21 | Configure a session handling rule that applies to relevant request(s) and 22 | invokes this extension. 23 |
    4. 24 |
25 | 26 |

27 | For more detailed instructions on how to use/leverage Google Auhtenticator, 28 | consult the README available on the 29 | GitHub project page. 32 |

33 | -------------------------------------------------------------------------------- /BappManifest.bmf: -------------------------------------------------------------------------------- 1 | Uuid: fb3685f958f8424493945c6c60c0920c 2 | ExtensionType: 1 3 | Name: Google Authenticator 4 | RepoName: google-authenticator 5 | ScreenVersion: 1.0 6 | SerialVersion: 1 7 | MinPlatformVersion: 0 8 | ProOnly: False 9 | Author: Alexandre Teyar, Aegis Cyber (www.aegiscyber.co.uk) 10 | ShortDescription: Generate Google Authenticator OTPs in session handling rules. 11 | EntryPoint: build/libs/GoogleAuthenticator-all-1.0.jar 12 | BuildCommand: gradle fatJar 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # google-authenticator 2 | 3 | [![Language](https://img.shields.io/badge/Lang-Java-blue.svg)](https://www.java.com) 4 | [![License](https://img.shields.io/badge/License-Apache%202.0-red.svg)](https://opensource.org/licenses/Apache-2.0) 5 | 6 | ## A `Burp Suite` extension to apply the current Google Two-Tactor Authentication (`2FA`) code to relevant/selected requests. 7 | 8 | This `Burp Suite` extension turns `Burp` into a `Google Authenticator` client. The current Google `Two-Factor Authentication (2FA)` code is automatically computed from a given shared secret and applied to bespoke location(s) in relevant requests in real-time. 9 | 10 | Further information on two-factor authentication is available at the following links: 11 | 12 | - 13 | - 14 | - 15 | 16 | Further information about `Burp` session handling rules is available at the following link: 17 | 18 | - 19 | 20 | ## Graphic User Interface (`GUI`) overview 21 | 22 | ![example](images/configuration-1.png) 23 | 24 | - Top panel: Secret shared key, used to generate the `Google 2FA` code using the `Time-based One-Time Password (TOTP)` algorithm specified in `RFC4226` and `RFC6238`. 25 | - Left panel: Regular expression for the session handling rule to match and replace with the current `Google 2FA` code. 26 | - Right panel: `Google 2FA` generated code in real-time. 27 | 28 | ## Example 29 | 30 | ### Problem 31 | 32 | We have been commissioned to perform a web application penetration test on www.foobar.com. This web application implements a login form incorporating `Google 2FA` for an additional layer of defence (prevents automated attacks such as brute forcing attacks). The client provided us with testing credentials along with a link to set up the Google Authenticator mobile application to allow for authenticated testing. 33 | 34 | A login is performed using the following request (in this example, the `pin` `JSON` parameter is the `Google 2FA`). 35 | 36 | ``` 37 | POST /api/login HTTP/1.1 38 | Host: foobar.com 39 | User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/504482 Firefox/60.0 40 | Accept: application/json, text/plain, */* 41 | Accept-Language: en-US,en;q=0.5 42 | Accept-Encoding: gzip, deflate 43 | Referer: https://foobar.com/login 44 | Content-Type: application/json;charset=utf-8 45 | Content-Length: 74 46 | Connection: close 47 | 48 | {"email":"ares@foobar.com","password":"SuperP@ssw0rd!","pin":"504482"} 49 | ``` 50 | 51 | Following the aforementioned link, we obtain the shared secret (`42TCJUDP94W27YR3`) that the `Time-based One-time Password Algorithm (TOTP)` uses to generate the `Google 2FA` codes. 52 | 53 | During testing, we observed that the application is being protected by a `Web Application Firewall (WAF)`, logging our test user out each time a malicious payload is detected or if too many requests are sent in a short period of time. This configuration makes it virtually impossible to take advantage of the `Burp Suite` automated scan capabilities. 54 | 55 | ### Solution 56 | 57 | 1. Input relevant parameter(s) into the Google Authenticator interface: 58 | 59 | - Shared secret: `42TCJUDP94W27YR3` 60 | - Regular expression: `(? `Sessions` -> `Session Handling Rules` -> `Add` a `Session Handling Rule` -> `Invoke a Burp extension` -> `Google Authenticator: 2FA code applied to selected parameter`. 63 | 64 | ![example](images/configuration-2.png) 65 | 66 | 3. Configure the relevant scope for the registered session handling rule. 67 | 68 | 4. Watch/monitor relevant request(s) getting updated with the valid/refreshed `Google 2FA` code generated by `Google Authenticator` using either `Project options` -> `Sessions` -> `Session Handling Rules` -> `Open session tracer` or the `Logger` tab. 69 | 70 | ![example](images/session-tracer.png) 71 | 72 | ## Tips 73 | 74 | - Use the regex `(? { 69 | this.dataSet.setPin(this.dataSet.getKey()); 70 | this.pinLabel.setText(this.dataSet.getPin()); 71 | 72 | if (DEBUG) { 73 | this.callbacks.printOutput(String.format("%s", 74 | ((SessionHandlingAction) this.callbacks.getSessionHandlingActions().get(0)).getDataSet().toString())); 75 | } 76 | }); 77 | 78 | this.timer.setRepeats(Boolean.TRUE); 79 | this.timer.setInitialDelay(0); 80 | } 81 | 82 | private void initComponents() { 83 | this.setLayout(new BorderLayout()); 84 | 85 | JPanel keyPanel = initKeyPanel(); 86 | 87 | JPanel configurationPanel = initConfigurationPanel(); 88 | JPanel twoFAPanel = initTwoFAPanel(); 89 | 90 | JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT); 91 | splitPane.setTopComponent(configurationPanel); 92 | splitPane.setBottomComponent(twoFAPanel); 93 | 94 | JPanel southPanel = new JPanel(); 95 | southPanel.add(new JLabel(COPYRIGHT)); 96 | 97 | this.add(keyPanel, BorderLayout.NORTH); 98 | this.add(splitPane); 99 | this.add(southPanel, BorderLayout.SOUTH); 100 | } 101 | 102 | private JPanel initKeyPanel() { 103 | this.keyTextField.setHorizontalAlignment(SwingConstants.CENTER); 104 | 105 | JButton runButton = new JButton("Run/Update"); 106 | runButton.setBackground(javax.swing.UIManager.getLookAndFeelDefaults().getColor("Burp.burpOrange")); 107 | runButton.setFont(new Font(runButton.getFont().getName(), Font.BOLD, runButton.getFont().getSize())); 108 | runButton.setForeground(javax.swing.UIManager.getLookAndFeelDefaults().getColor("Burp.primaryButtonForeground")); 109 | runButton.addActionListener(e -> { 110 | // TODO: Check if 'key' is valid, if not, print 'statusLabel' in Color.RED and 111 | // do nothing/stop timer. 112 | this.dataSet.setKey(keyTextField.getText()); 113 | 114 | if (this.dataSet.getKey() == null) { 115 | this.pinLabel.setText(null); 116 | this.timer.stop(); 117 | } else { 118 | this.timer.restart(); 119 | } 120 | 121 | if (DEBUG) { 122 | this.callbacks.printOutput(String.format("%s", 123 | ((SessionHandlingAction) this.callbacks.getSessionHandlingActions().get(0)).getDataSet().toString())); 124 | } 125 | }); 126 | 127 | JPanel keyPanel = new JPanel(); 128 | keyPanel.setBorder(BorderFactory.createTitledBorder("")); 129 | keyPanel.add(new JLabel("Shared secret:")); 130 | keyPanel.add(this.keyTextField); 131 | keyPanel.add(runButton); 132 | 133 | return keyPanel; 134 | } 135 | 136 | private JPanel initConfigurationPanel() { 137 | JPanel configurationPanel = new JPanel(new GridBagLayout()); 138 | configurationPanel.setBorder(BorderFactory.createTitledBorder("Session Handling Rule Configuration")); 139 | 140 | JLabel instructionsLabel = new JLabel("" + "" 141 | + "

Follow the instructions below to properly configure " + EXTENSION 142 | + " in order to be more eaily assess application(s) relying on Google 2FA services.

" + "
    " 143 | + "
  1. Specify the expression to match in the field below (accepts regex).
    2. " 144 | + "
  2. Configure a session handling rule under 'Project Options -> Sessions -> Session Handing Rules' that invokes " 145 | + EXTENSION + "," + "
    " 146 | + "see https://portswigger.net/support/configuring-burp-suites-session-handling-rules for detailed information on how to configure Burp's session handling rules.
    3. " 147 | + "
  3. Monitor issued request(s) using either the 'Open session tracer' feature available under 'Project Options -> Sessions -> Session Handing Rules' or the" 148 | + "
    " + "'Logger' to make sure that Google 2FA codes are getting updated.
    4. " + "
" 149 | + "Note: Issued request(s) will be searched for the configured (regular) expression which will then get automatically replaced with refreshed/valid Google 2FA codes." 150 | + ""); 151 | 152 | JTextField regexTextField = new JTextField(32); 153 | regexTextField.getDocument().addDocumentListener(new DocumentListener() { 154 | void update() { 155 | dataSet.setRegex(regexTextField.getText()); 156 | 157 | if (DEBUG) { 158 | callbacks.printOutput(String.format("%s", 159 | ((SessionHandlingAction) callbacks.getSessionHandlingActions().get(0)).getDataSet().toString())); 160 | } 161 | } 162 | 163 | @Override 164 | public void insertUpdate(DocumentEvent e) { 165 | update(); 166 | } 167 | 168 | @Override 169 | public void removeUpdate(DocumentEvent e) { 170 | update(); 171 | } 172 | 173 | @Override 174 | public void changedUpdate(DocumentEvent e) { 175 | update(); 176 | } 177 | }); 178 | // Prevents JTextField from collapsing on resizes... 179 | regexTextField.setMinimumSize(new Dimension(regexTextField.getPreferredSize())); 180 | 181 | JCheckBox hasRegexCheckbox = new JCheckBox("regex"); 182 | hasRegexCheckbox.addActionListener(e -> { 183 | AbstractButton abstractButton = (AbstractButton) e.getSource(); 184 | dataSet.setHasRegex(abstractButton.isSelected()); 185 | 186 | if (DEBUG) { 187 | this.callbacks.printOutput(String.format("%s", 188 | ((SessionHandlingAction) this.callbacks.getSessionHandlingActions().get(0)).getDataSet().toString())); 189 | } 190 | }); 191 | 192 | JPanel regexPanel = new JPanel(); 193 | regexPanel.add(new JLabel("Expression to match:")); 194 | regexPanel.add(regexTextField); 195 | regexPanel.add(hasRegexCheckbox); 196 | 197 | GridBagConstraints gridBagConstraints = new GridBagConstraints(); 198 | gridBagConstraints.anchor = GridBagConstraints.NORTHWEST; 199 | gridBagConstraints.fill = GridBagConstraints.HORIZONTAL; 200 | gridBagConstraints.insets = new Insets(4, 8, 4, 8); 201 | gridBagConstraints.gridy = 0; 202 | gridBagConstraints.weightx = 1.0; 203 | gridBagConstraints.weighty = 0; 204 | 205 | configurationPanel.add(instructionsLabel, gridBagConstraints); 206 | 207 | gridBagConstraints.gridy = 1; 208 | gridBagConstraints.fill = GridBagConstraints.NONE; 209 | gridBagConstraints.weightx = 0; 210 | gridBagConstraints.weighty = 1.0; 211 | 212 | configurationPanel.add(regexPanel, gridBagConstraints); 213 | 214 | return configurationPanel; 215 | } 216 | 217 | private JPanel initTwoFAPanel() { 218 | JPanel twoFAPanel = new JPanel(); 219 | twoFAPanel.setBorder(BorderFactory.createTitledBorder("Google 2FA Code")); 220 | 221 | // Default size is: 11 222 | this.pinLabel 223 | .setFont(new Font(this.pinLabel.getFont().getName(), Font.BOLD, this.pinLabel.getFont().getSize() + 37)); 224 | 225 | twoFAPanel.add(this.pinLabel); 226 | 227 | return twoFAPanel; 228 | } 229 | 230 | @Override 231 | public String getTabCaption() { 232 | return EXTENSION; 233 | } 234 | 235 | @Override 236 | public Component getUiComponent() { 237 | return this; 238 | } 239 | } 240 | -------------------------------------------------------------------------------- /src/main/java/googleauthenticator/utils/DataSet.java: -------------------------------------------------------------------------------- 1 | package googleauthenticator.utils; 2 | 3 | import com.warrenstrange.googleauth.GoogleAuthenticator; 4 | 5 | import burp.IBurpExtenderCallbacks; 6 | 7 | public final class DataSet { 8 | 9 | private IBurpExtenderCallbacks callbacks; 10 | 11 | private boolean hasRegex = Boolean.FALSE; 12 | private String key; 13 | private String pin; 14 | private String regex; 15 | 16 | public DataSet(IBurpExtenderCallbacks callbacks) { 17 | this.callbacks = callbacks; 18 | } 19 | 20 | public boolean getHasRegex() { 21 | return hasRegex; 22 | } 23 | 24 | public String getKey() { 25 | return key; 26 | } 27 | 28 | public String getPin() { 29 | return pin; 30 | } 31 | 32 | public String getRegex() { 33 | return regex; 34 | } 35 | 36 | public void setHasRegex(Boolean hasRegex) { 37 | this.hasRegex = hasRegex; 38 | } 39 | 40 | public void setKey(String key) { 41 | if (key != null && !key.equals("")) { 42 | this.key = key; 43 | } else { 44 | this.key = null; 45 | } 46 | } 47 | 48 | public void setPin(String key) { 49 | if (key != null && !key.equals("")) { 50 | this.pin = Integer.toString(new GoogleAuthenticator().getTotpPassword(key)); 51 | } else { 52 | this.pin = null; 53 | } 54 | } 55 | 56 | public void setRegex(String regex) { 57 | this.regex = regex; 58 | } 59 | 60 | public String toString() { 61 | return "DataSet{" + "hasRegex=" + hasRegex + ", key='" + key + '\'' + ", pin='" + pin + '\'' + ", regex='" + regex 62 | + '\'' + '}'; 63 | } 64 | } 65 | -------------------------------------------------------------------------------- /src/test/resources/log4j.properties: -------------------------------------------------------------------------------- 1 | # Root logger option 2 | log4j.rootLogger=DEBUG, stdout, file 3 | # Redirect log messages to console 4 | log4j.appender.stdout=org.apache.log4j.ConsoleAppender 5 | log4j.appender.stdout.Target=System.out 6 | log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 7 | log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n 8 | # Redirect log messages to a log file, support file rolling. 9 | log4j.appender.file=org.apache.log4j.RollingFileAppender 10 | log4j.appender.file.File=${CATALINA_HOME}/logs 11 | log4j.appender.file.MaxFileSize=5MB 12 | log4j.appender.file.MaxBackupIndex=10 13 | log4j.appender.file.layout=org.apache.log4j.PatternLayout 14 | log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n 15 | --------------------------------------------------------------------------------