cs401 cyber security spring 2008 libpurple/pidgin password plugin jonathan blount charles tullock c....
TRANSCRIPT
![Page 1: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/1.jpg)
CS401 Cyber SecuritySpring 2008
LibPurple/PidginPassword Plugin
Jonathan Blount Charles Tullock C. Shaun Wagner
![Page 2: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/2.jpg)
Introductionto
LibPurple
Charles Tullock
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What is LibPurple?Open Source Library in C
Instant Messaging Routines
Account Management
LibPurple IntroductionLibPurple Introduction
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What is LibPurple?Protocols: AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ,
Lotus Sametime, SILC, SIMPLE, MySpaceIM, Zephyr
LibPurple IntroductionLibPurple Introduction
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What is Pidgin?One application, multiple protocols
simultaneously
Windows and *nix
Default IM program on many *nix platforms
LibPurple IntroductionLibPurple Introduction
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Usage of LibPurple
Adium MeeboApollo IM OpenWengoEQO PidginFinch ScatterChatInstantbird Telepathy-Haze
LibPurple IntroductionLibPurple Introduction
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Password StoragePasswords in accounts.xml (plain text)
Developers choose no security as opposed to false security.
LibPurple IntroductionLibPurple Introduction
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Password OptionsSecurity by obscurity
Control access to plain text file
Encrypt password behind a password
LibPurple IntroductionLibPurple Introduction
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Password Behind a PasswordKDE Wallet
Windows: LibCrypt, Credential ManagementGnome Keyring Service
3rd Party Applications
LibPurple IntroductionLibPurple Introduction
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Platform Independent Pluginplugin_encrypt_passwords
Encrypts all passwords stored in plain text.Removes passwords from plain text after
encryption.
LibPurple IntroductionLibPurple Introduction
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Platform Independent Pluginplugin_encrypt_passwords
plugin_fetch_passwordsUsed to fetch passwords for all accounts
before accounts connect to messaging services.
LibPurple IntroductionLibPurple Introduction
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Platform Independent Pluginplugin_encrypt_passwords
plugin_fetch_passwordsplugin_decrypt_passwords
Decrypt all encrypted passwords and place them in the plain text accounts file.
LibPurple IntroductionLibPurple Introduction
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Plugin ImpactLibPurple applications are more secure
Same password for multiple systems
Indirect vulnerabilities
LibPurple IntroductionLibPurple Introduction
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Questions?
LibPurple IntroductionLibPurple Introduction
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KWallet Pluginfor
LibPurple (Pidgin)
C. Shaun Wagner
![Page 16: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/16.jpg)
KWallet is a credentials management application for the K Desktop Environment
(KDE).
KWallet is the preferred method for saving passwords in KDE.
KWallet PluginKWallet Plugin
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KWallet Features
Password behind a password encryption
Warns users when programs access passwords
Users may easily manage encrypted data
KWallet PluginKWallet Plugin
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Implementing KWallet
Direct API implementation
Messaging bus implementation:
DCOP for KDE3
D-BUS for KDE4
KWallet PluginKWallet Plugin
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Goals
Save passwords in KWallet when requested
Fetch passwords from KWallet as needed
Save passwords in plain text when requested
KWallet PluginKWallet Plugin
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Goals
Code should be as simple as possible
Code should compile using default makefile
Plugin should work in KDE3 and KDE4
KWallet PluginKWallet Plugin
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LibPurple and KWallet
do not integrate easily
KWallet PluginKWallet Plugin
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Problem
LibPurple plugins must be written in C
KWallet applications must be written in C++
KWallet PluginKWallet Plugin
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Problem
LibPurple plugins must be written in C
KWallet applications must be written in C++
Solution
Wrap required C code in extern “C”
KWallet PluginKWallet Plugin
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Problem
KWallet plugin requries Qt headers and compilation with a C++ compiler
KWallet PluginKWallet Plugin
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Problem
KWallet plugin requries Qt headers and compilation with a C++ compiler
Solution
Redefine compiler and header includes on the command line for make
KWallet PluginKWallet Plugin
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Problem
LibPurple is a GTK+ application
KWallet is a Qt application
GTK+ is incompatible with Qt in many ways
KWallet PluginKWallet Plugin
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Problem
GTK+ is incompatible with Qt in many ways
Solution
Manually translate GTK+ types to and from Qt types. Example:
Convert gchar* to char* to QString
KWallet PluginKWallet Plugin
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Compiling
Included all Qt libraries
Converted values between GTK+ and Qt
Wrapped C code in extern “C”
Compiled with C++ compiler
KWallet PluginKWallet Plugin
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Segmentation Fault
KWallet must have a parent Qt application
KWallet PluginKWallet Plugin
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Segmentation Fault
KWallet must have a parent Qt application
Solution
Create an empty (and invisible) KApplication
which is the parent class for all KDE/Qt applications
KWallet PluginKWallet Plugin
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Segmentation Fault
KWallet cannot open the default wallet
KWallet PluginKWallet Plugin
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Segmentation Fault
KWallet cannot open the default wallet
Solution
Undocumented: The lkwalletclient library must be linked when compiling
KWallet PluginKWallet Plugin
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Segmentation Fault
KApplication and KWallet cannot be re-instantiated inside of functions
KWallet PluginKWallet Plugin
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Segmentation Fault
KApplication and KWallet cannot be re-instantiated inside of functions
Solution
Make both KApplication and KWallet global
KWallet PluginKWallet Plugin
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Beta Test
Encrypt Passwords
KWallet PluginKWallet Plugin
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Beta Test
Encrypt Passwords
Successful
All passwords were removed from the plain text file and placed in KWallet
KWallet PluginKWallet Plugin
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Beta Test
Fetch Passwords
Successful
All passwords were fetched and attached to the accounts before the accounts
connected to the messaging services
KWallet PluginKWallet Plugin
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Beta Test
Decrypt Passwords
KWallet PluginKWallet Plugin
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Beta Test
Decrypt Passwords
Successful
All passwords were removed from KWallet and placed in the plain text file
KWallet PluginKWallet Plugin
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Beta Test
KDE3 and KDE4 test
Successful
Plugin performed properly in both KDE3 and KDE4 using Pidgin 2.4
KWallet PluginKWallet Plugin
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Note on D-BUS
D-BUS is standard application communication service in KDE4
LibPurple has D-BUS functionality in the plugin API
KWallet PluginKWallet Plugin
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Questions?
KWallet PluginKWallet Plugin
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Windows Pluginfor
LibPurple (Pidgin)
Jonathan Blount
![Page 44: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/44.jpg)
Password Management
Credential Manager
Hard to integrate
Easily hacked
Windows PluginWindows Plugin
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Password Management
CryptoAPI
Windows 2000
Data Protection API
Crypt32.dll library
More secure
Windows PluginWindows Plugin
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DPAPI
Functions
CryptProtectData
CryptUnprotectData
Windows PluginWindows Plugin
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DPAPI
Optional Entropy
Only a user with the same logon credentials as the encrypting user can decrypt the
data
Windows PluginWindows Plugin
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DPAPI
Windows PluginWindows Plugin
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Environment
Pidgin/LibPurple on Windows using Cygwin
Written in C and makes heavy use of Glib (GTK++)
Link to Windows libraries
Windows PluginWindows Plugin
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Environment
No external password management program
Debugging
Windows PluginWindows Plugin
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DLL Loading
Load external library
Create the handle to the DLL
Free the library when done
Set pointer to NULL
Windows PluginWindows Plugin
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Encryption
Windows PluginWindows Plugin
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Storing Binary in Text File
Convert a byte array to a string
Visual C# is one line of code
Windows PluginWindows Plugin
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Storing Binary in Text File
Convert a byte array to a string
C is over 20 lines of code
Windows PluginWindows Plugin
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Decryption
Windows PluginWindows Plugin
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Fetching Passwords
Straightforward
Decrypt Passwords
Load Accounts
Windows PluginWindows Plugin
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Beta Testing
Encrypting Passwords: Success
Fetching Passwords: Success
Decrypting Passwords: Success
Windows PluginWindows Plugin
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Questions?
Windows PluginWindows Plugin
![Page 59: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/59.jpg)
Demo
LibPurple PluginLibPurple Plugin
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KWallet Pluginfor
LibPurple (Pidgin)
C. Shaun Wagner
![Page 62: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/62.jpg)
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Windows Pluginfor
LibPurple (Pidgin)
Jonathan Blount
![Page 66: CS401 Cyber Security Spring 2008 LibPurple/Pidgin Password Plugin Jonathan Blount Charles Tullock C. Shaun Wagner](https://reader036.vdocument.in/reader036/viewer/2022062717/56649e4a5503460f94b3efb5/html5/thumbnails/66.jpg)
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