Patch to etherpad to enable ldap and single-sign-on support

ldap_support.patch

diff -r 78a2f7962089 trunk/etherpad/src/etherpad/pro/pro_accounts.js
--- a/trunk/etherpad/src/etherpad/pro/pro_accounts.js	Tue Dec 22 14:51:36 2009 -0500
+++ b/trunk/etherpad/src/etherpad/pro/pro_accounts.js	Mon Jan 04 07:34:56 2010 -0800
@@ -30,11 +30,15 @@
 import("etherpad.pro.domains");
 import("etherpad.control.pro.account_control");
 import("etherpad.pro.pro_utils");
+import("etherpad.pro.pro_ldap_support.*");
 import("etherpad.pro.pro_quotas");
 import("etherpad.pad.padusers");
 import("etherpad.log");
 import("etherpad.billing.team_billing");
 
+import("process.*");
+import("fastJSON")
+
 jimport("org.mindrot.BCrypt");
 jimport("java.lang.System.out.println");
 
@@ -82,18 +86,23 @@
 }
 
 /* if domainId is null, then use domainId of current request. */
-function createNewAccount(domainId, fullName, email, password, isAdmin) {
+function createNewAccount(domainId, fullName, email, password, isAdmin, skipValidation) {
   if (!domainId) {
     domainId = domains.getRequestDomainId();
   }
+  if (!skipValidation) {
+    skipValidation = false;
+  }
   email = trim(email);
   isAdmin = !!isAdmin; // convert to bool
 
   // validation
-  var e;
-  e = validateEmail(email); if (e) { throw Error(e); }
-  e = validateFullName(fullName); if (e) { throw Error(e); }
-  e = validatePassword(password); if (e) { throw Error(e); }
+  if (!skipValidation) {
+    var e;
+    e = validateEmail(email); if (e) { throw Error(e); }
+    e = validateFullName(fullName); if (e) { throw Error(e); }
+    e = validatePassword(password); if (e) { throw Error(e); }
+  }
 
   // xss normalization
   fullName = toHTML(fullName);
@@ -212,6 +221,27 @@
   });
 }
 
+function attemptSingleSignOn() {
+  if(!appjet.config['etherpad.SSOScript']) return null;
+  
+  // pass request.cookies to a small user script
+  var file = appjet.config['etherpad.SSOScript'];
+      
+  var cmd = exec(file);
+  
+  // note that this will block until script execution returns
+  var result = cmd.write(fastJSON.stringify(request.cookies)).result();
+  var val = false;
+  
+  // we try to parse the result as a JSON string, if not, return null.
+  try {
+    if(!!(val=fastJSON.parse(result))) {
+      return val;
+    }
+  } catch(e) {}
+  return null;
+}
+
 function getSessionProAccount() {
   if (sessions.isAnEtherpadAdmin()) {
     return getEtherpadAdminAccount();
@@ -231,6 +261,25 @@
   if (getSessionProAccount()) {
     return true;
   } else {
+    // if the user is not signed in, check to see if he should be signed in
+    // by calling an external script.
+    if(appjet.config['etherpad.SSOScript']) {
+      var ssoResult = attemptSingleSignOn();
+      if(ssoResult && ('email' in ssoResult)) {
+        var user = getAccountByEmail(ssoResult['email']);
+        if (!user) {
+          var email = ssoResult['email'];
+          var pass = ssoResult['password'] || "";
+          var name = ssoResult['fullname'] || "unnamed";
+          createNewAccount(null, name, email, pass, false, true);
+          user = getAccountByEmail(email, null);
+        }
+        
+        signInSession(user);
+        return true;
+      }
+    }
+    
     return false;
   }
 }
@@ -289,6 +338,47 @@
 
 /* returns undefined on success, error string otherise. */
 function authenticateSignIn(email, password) {
+  // blank passwords are not allowed to sign in.
+  if (password == "") return "Please provide a password.";
+  
+  // If the email ends with our ldap suffix...
+  var isLdapSuffix = getLDAP() && getLDAP().isLDAPSuffix(email);
+
+  if(isLdapSuffix && !getLDAP()) {
+    return "LDAP not yet configured. Please contact your system admininstrator.";
+  }
+  
+  // if there is an error in the LDAP configuration, return the error message
+  if(getLDAP() && getLDAP().error) {
+    return getLDAP().error + " Please contact your system administrator.";
+  }
+  
+  if(isLdapSuffix && getLDAP()) {
+    var ldapuser = email.substr(0, email.indexOf(getLDAP().getLDAPSuffix()));
+    var ldapResult = getLDAP().login(ldapuser, password);
+
+    if (ldapResult.error == true) {
+      return ldapResult.message + "";
+    }
+
+    var accountRecord = getAccountByEmail(email, null);
+
+    // if this is the first time this user has logged in, create a user
+    // for him/her
+    if (!accountRecord) {
+      // password to store in database -- a blank password means the user
+      // cannot authenticate normally (e.g. must go through SSO or LDAP)
+      var ldapPass = "";
+      
+      // create a new user (skipping validation of email/users/passes)
+      createNewAccount(null, ldapResult.getFullName(), email, ldapPass, false, true);
+      accountRecord = getAccountByEmail(email, null);
+    }
+    
+    signInSession(accountRecord);
+    return undefined; // success
+  }
+  
   var accountRecord = getAccountByEmail(email, null);
   if (!accountRecord) {
     return "Account not found: "+email;
diff -r 78a2f7962089 trunk/etherpad/src/etherpad/pro/pro_ldap_support.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trunk/etherpad/src/etherpad/pro/pro_ldap_support.js	Mon Jan 04 07:34:56 2010 -0800
@@ -0,0 +1,217 @@
+import("fastJSON");
+
+jimport("net.appjet.common.util.BetterFile")
+
+jimport("java.lang.System.out.println");
+jimport("javax.naming.directory.DirContext");
+jimport("javax.naming.directory.SearchControls");
+jimport("javax.naming.directory.InitialDirContext");
+jimport("javax.naming.directory.SearchResult");
+jimport("javax.naming.NamingEnumeration");
+jimport("javax.naming.Context");
+jimport("java.util.Hashtable");
+
+function LDAP(config, errortext) {
+  if(!config)
+    this.error = errortext;
+  else
+    this.error = false;
+
+  this.ldapConfig = config;
+}
+
+function _dmesg(m) {
+  // if (!isProduction()) {
+    println(new String(m));
+  // }
+}
+
+/**
+ * an ldap result object
+ *
+ * will either have error = true, with a corrisponding error message,
+ * or will have error = false, with a corrisponding results object message
+ */
+function LDAPResult(msg, error, ldap) {
+  if(!ldap) ldap = getLDAP();
+  if(!error) error = false;
+  this.message = msg;
+  this.ldap = ldap;
+  this.error = error;
+}
+
+/** 
+ * returns the full name attribute, as specified by the 'nameAttribute' config
+ * value.
+ */
+LDAPResult.prototype.getFullName = function() {
+  return this.message[this.ldap.ldapConfig['nameAttribute']][0];
+}
+
+/**
+ * Handy function for creating an LDAPResult object
+ */
+function ldapMessage(success, msg) {
+  var message = msg;
+  if(typeof(msg) == String) {
+  message =  "LDAP " + 
+             (success ? "Success" : "Error") + ": " + msg;
+  }
+  
+  var result = new LDAPResult(message);
+  result.error = !success;
+  return result;
+}
+
+// returns the associated ldap results object, with an error flag of false
+var ldapSuccess = 
+  function(msg) { return ldapMessage.apply(this, [true,  msg]); };
+
+// returns a helpful error message
+var ldapError = 
+  function(msg) { return ldapMessage.apply(this, [false, msg]); };
+
+/* build an LDAP Query (searches for an objectClass and uid) */
+LDAP.prototype.buildLDAPQuery = function(queryUser) {
+  if(queryUser && queryUser.match(/[\w_-]+/)) {
+    return "(&(objectClass=" +
+            this.ldapConfig['userClass'] + ")(uid=" +
+            queryUser + "))"
+  } else return null;
+}
+
+LDAP.prototype.login = function(queryUser, queryPass) {
+    var query = this.buildLDAPQuery(queryUser);
+    if(!query) { return ldapError("invalid LDAP username"); }
+    
+    try {
+        var context = LDAP.authenticate(this.ldapConfig['url'], 
+                                        this.ldapConfig['principal'],
+                                        this.ldapConfig['password']);
+                                   
+        if(!context) {
+          return ldapError("could not authenticate principle user.");
+        }
+
+        var ctrl = new SearchControls();
+        ctrl.setSearchScope(SearchControls.SUBTREE_SCOPE);
+        var results = context.search(this.ldapConfig['rootPath'], query, ctrl);
+        
+        // if the user is found
+        if(results.hasMore()) {
+          var result = results.next();
+          
+          // grab the absolute path to the user
+          var userResult = result.getNameInNamespace();
+          var authed = !!LDAP.authenticate(this.ldapConfig['url'],
+                                           userResult,
+                                           queryPass)
+          
+          // return the LDAP info on the user upon success
+          return authed ? 
+            ldapSuccess(LDAP.parse(result)) : 
+            ldapError("Incorrect password. Please try again.");
+        } else {
+          return ldapError("User "+queryUser+" not found in LDAP.");
+        }
+    
+    // if there are errors in the search, log them and return "unknown error"
+    } catch (e) {
+        _dmesg(e);
+        return ldapError(new String(e))
+    }
+};
+
+LDAP.prototype.isLDAPSuffix = function(email) {
+  return email.indexOf(this.ldapConfig['ldapSuffix']) == 
+         (email.length-this.ldapConfig['ldapSuffix'].length);
+}
+
+LDAP.prototype.getLDAPSuffix = function() {
+  return this.ldapConfig['ldapSuffix'];
+}
+
+/* static function returns a DirContext, or undefined upon authentation err */
+LDAP.authenticate = function(url, user, pass) {
+  var context = null;
+  try {
+    var env = new Hashtable();
+    env.put(Context.INITIAL_CONTEXT_FACTORY,
+      "com.sun.jndi.ldap.LdapCtxFactory");
+    env.put( Context.SECURITY_PRINCIPAL, user );
+    env.put( Context.SECURITY_CREDENTIALS, pass );
+    env.put(Context.PROVIDER_URL, url);
+    context = new InitialDirContext(env);      
+  } catch (e) {
+    // bind failed.
+  }
+  return context;
+}
+
+/* turn a res */
+LDAP.parse = function(result) {
+    var resultobj = {};
+    try {
+      var attrs = result.getAttributes();
+      var ids = attrs.getIDs();
+    
+      while(ids.hasMore()) {
+        var id = ids.next().toString();
+        resultobj[id] = [];
+      
+        var attr = attrs.get(id);
+      
+        for(var i=0; i<attr.size(); i++) {
+          resultobj[id].push(attr.get(i).toString());
+        }
+      }
+    } catch (e) {
+      // naming error
+      return {'keys': e}
+    }
+
+    return resultobj;
+}
+
+LDAP.ldapSingleton = false;
+
+// load in ldap configuration from a file...
+function readLdapConfig(file) {
+  var fileContents = BetterFile.getFileContents(file);
+
+  if(fileContents == null)
+    return "File not found.";
+
+  var configObject = fastJSON.parse(fileContents);
+  if(configObject['ldapSuffix']) {
+    LDAP.ldapSuffix = configObject['ldapSuffix'];
+  }
+  return configObject;
+}
+
+// Sample Configuration file:
+// {
+//   "userClass"    : "person",
+//   "url"          : "ldap://localhost:10389",
+//   "principal"    : "uid=admin,ou=system",
+//   "password"     : "secret",
+//   "rootPath"     : "ou=users,ou=system",
+//   "nameAttribute": "displayname",
+//   "ldapSuffix"   : "@ldap"
+// }
+
+// appjet.config['etherpad.useLdapConfiguration'] = "/Users/kroo/Documents/Projects/active/AppJet/ldapConfig.json";
+function getLDAP() {
+  if (!  LDAP.ldapSingleton &&
+      appjet.config['etherpad.useLdapConfiguration']) {
+    var config = readLdapConfig(appjet.config['etherpad.useLdapConfiguration']);
+    var error = null;
+    if(!config) {
+      config = null;
+      error = "Error reading LDAP configuration file."
+    }
+    LDAP.ldapSingleton = new LDAP(config, error);
+  }
+  
+  return LDAP.ldapSingleton;
+}
\ No newline at end of file
diff -r 78a2f7962089 trunk/infrastructure/framework-src/modules/process.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trunk/infrastructure/framework-src/modules/process.js	Mon Jan 04 07:34:56 2010 -0800
@@ -0,0 +1,91 @@
+/**
+ * Simple way to execute external commands through javascript
+ *
+ * @example
+ cmd = exec("cat");
+ System.out.println("First: " +cmd.write("this is a loop.").read(Process.READ_AVAILABLE)); // prints "this is a loop."
+ System.out.println("Second: " +cmd.writeAndClose(" hi there").result()); // prints "this is a loop. hi there"
+ * 
+ */
+
+jimport("java.lang.Runtime");
+jimport("java.io.BufferedInputStream");
+jimport("java.io.BufferedOutputStream");
+jimport("java.lang.System");
+
+/* returns a process */
+function exec(process) {
+  return new Process(process);
+};
+
+function Process(cmd) {
+  this.cmd = cmd;
+  this.proc = Runtime.getRuntime().exec(cmd);
+  this.resultText = "";
+  this.inputStream = new BufferedInputStream(this.proc.getInputStream());
+  this.errorStream = new BufferedInputStream(this.proc.getErrorStream());
+  this.outputStream = new BufferedOutputStream(this.proc.getOutputStream());
+}
+
+Process.CHUNK_SIZE = 1024;
+Process.READ_ALL = -1;
+Process.READ_AVAILABLE = -2;
+
+Process.prototype.write = function(stdinText) {
+  this.outputStream.write(new java.lang.String(stdinText).getBytes());
+  this.outputStream.flush();
+  return this;
+};
+
+Process.prototype.writeAndClose = function(stdinText) {
+  this.write(stdinText);
+  this.outputStream.close();
+  return this;
+};
+
+/* Python file-like behavior: read specified number of bytes, else until EOF*/
+Process.prototype.read = function(nbytesToRead, stream) {
+  var inputStream = stream || this.inputStream;
+  var availBytes = inputStream.available();
+  if (!availBytes) return null;
+  
+  var result = "";
+  var nbytes = nbytesToRead || Process.READ_ALL;
+  var readAll = (nbytes == Process.READ_ALL);
+  var readAvailable = (nbytes == Process.READ_AVAILABLE);
+  while (nbytes > 0 || readAll || readAvailable) {
+    var chunkSize = readAll ? Process.CHUNK_SIZE :
+              readAvailable ? Process.CHUNK_SIZE : nbytes;
+
+    // allocate a java byte array
+    var bytes = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, chunkSize);
+
+    var len = inputStream.read(bytes, 0, chunkSize);
+    
+    // at end of stream, or when we run out of data, stop reading in chunks.
+    if (len == -1) break;
+    if (nbytes > 0) nbytes -= len;
+    
+    result += new java.lang.String(bytes);
+    
+    if (readAvailable && inputStream.available() == 0) break;
+  }
+  
+  this.resultText += new String(result);
+  return new String(result);
+};
+
+Process.prototype.result = function() {
+  this.outputStream.close();
+  this.proc.waitFor();
+  this.read(Process.READ_ALL, this.inputStream);
+  return new String(this.resultText);
+};
+
+Process.prototype.resultOrError = function() {
+  this.proc.waitFor();
+  this.read(Process.READ_ALL, this.inputStream);
+  var result = this.resultText;
+  if(!result || result == "") result = this.read(Process.READ_ALL, this.errorStream);
+  return result || "";
+};