From 7e0ce40e79a193426e8f7b6f22407422634dafe3 Mon Sep 17 00:00:00 2001
From: John Crygier <john.crygier@aon.com>
Date: Wed, 25 Apr 2012 08:37:52 -0400
Subject: [PATCH] Add logic to get display name & email (Simply stored in user model for now). Add code / test to defend against LDAP injection attacks.
---
src/com/gitblit/LdapUserService.java | 104 +++++++++++++++++++++++++++++++++++++++------------
1 files changed, 79 insertions(+), 25 deletions(-)
diff --git a/src/com/gitblit/LdapUserService.java b/src/com/gitblit/LdapUserService.java
index 9fcef9d..674e2a0 100644
--- a/src/com/gitblit/LdapUserService.java
+++ b/src/com/gitblit/LdapUserService.java
@@ -20,6 +20,7 @@
import java.net.URI;
import java.net.URISyntaxException;
import java.security.GeneralSecurityException;
+import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -136,7 +137,7 @@
// Find the logging in user's DN
String accountBase = settings.getString(Keys.realm.ldap_accountBase, "");
String accountPattern = settings.getString(Keys.realm.ldap_accountPattern, "(&(objectClass=person)(sAMAccountName=${username}))");
- accountPattern = StringUtils.replace(accountPattern, "${username}", simpleUsername);
+ accountPattern = StringUtils.replace(accountPattern, "${username}", escapeLDAPSearchFilter(simpleUsername));
SearchResult result = doSearch(ldapConnection, accountBase, accountPattern);
if (result != null && result.getEntryCount() == 1) {
@@ -148,15 +149,15 @@
UserModel user = getUserModel(simpleUsername);
if (user == null) // create user object for new authenticated user
- user = createUserFromLdap(simpleUsername, loggingInUser);
+ user = new UserModel(simpleUsername);
- user.password = "StoredInLDAP";
+
if (!supportsTeamMembershipChanges())
getTeamsFromLdap(ldapConnection, simpleUsername, loggingInUser, user);
- // Get Admin Attributes
- setAdminAttribute(user);
+ // Get User Attributes
+ setUserAttributes(user, loggingInUser);
// Push the ldap looked up values to backing file
super.updateUserModel(user);
@@ -174,16 +175,46 @@
}
private void setAdminAttribute(UserModel user) {
- String adminString = settings.getString(Keys.realm.ldap_admins, "");
- String[] admins = adminString.split(" ");
- user.canAdmin = false;
- for (String admin : admins) {
- if (admin.startsWith("@")) { // Team
- if (user.getTeam(admin.substring(1)) != null)
- user.canAdmin = true;
- } else
- if (user.getName().equalsIgnoreCase(admin))
- user.canAdmin = true;
+ user.canAdmin = false;
+ List<String> admins = settings.getStrings(Keys.realm.ldap_admins);
+ for (String admin : admins) {
+ if (admin.startsWith("@")) { // Team
+ if (user.getTeam(admin.substring(1)) != null)
+ user.canAdmin = true;
+ } else
+ if (user.getName().equalsIgnoreCase(admin))
+ user.canAdmin = true;
+ }
+ }
+
+ private void setUserAttributes(UserModel user, SearchResultEntry userEntry) {
+ // Is this user an admin?
+ setAdminAttribute(user);
+
+ // Don't want visibility into the real password, make up a dummy
+ user.password = "StoredInLDAP";
+
+ // Get Attributes for full name / email
+ String displayName = settings.getString(Keys.realm.ldap_displayName, "displayName");
+ String email = settings.getString(Keys.realm.ldap_email, "email");
+
+ // Replace embedded ${} with attributes
+ if (displayName.contains("${")) {
+ for (Attribute userAttribute : userEntry.getAttributes())
+ displayName = StringUtils.replace(displayName, "${" + userAttribute.getName() + "}", userAttribute.getValue());
+
+ user.displayName = displayName;
+ } else {
+ user.displayName = userEntry.getAttribute(displayName).getValue();
+ }
+
+ if (email.contains("${")) {
+ for (Attribute userAttribute : userEntry.getAttributes())
+ email = StringUtils.replace(email, "${" + userAttribute.getName() + "}", userAttribute.getValue());
+
+ user.emailAddress = email;
+ } else {
+ user.emailAddress = userEntry.getAttribute(email).getValue();
}
}
@@ -194,12 +225,12 @@
String groupBase = settings.getString(Keys.realm.ldap_groupBase, "");
String groupMemberPattern = settings.getString(Keys.realm.ldap_groupMemberPattern, "(&(objectClass=group)(member=${dn}))");
- groupMemberPattern = StringUtils.replace(groupMemberPattern, "${dn}", loggingInUserDN);
- groupMemberPattern = StringUtils.replace(groupMemberPattern, "${username}", simpleUsername);
+ groupMemberPattern = StringUtils.replace(groupMemberPattern, "${dn}", escapeLDAPSearchFilter(loggingInUserDN));
+ groupMemberPattern = StringUtils.replace(groupMemberPattern, "${username}", escapeLDAPSearchFilter(simpleUsername));
// Fill in attributes into groupMemberPattern
for (Attribute userAttribute : loggingInUser.getAttributes())
- groupMemberPattern = StringUtils.replace(groupMemberPattern, "${" + userAttribute.getName() + "}", userAttribute.getValue());
+ groupMemberPattern = StringUtils.replace(groupMemberPattern, "${" + userAttribute.getName() + "}", escapeLDAPSearchFilter(userAttribute.getValue()));
SearchResult teamMembershipResult = doSearch(ldapConnection, groupBase, groupMemberPattern);
if (teamMembershipResult != null && teamMembershipResult.getEntryCount() > 0) {
@@ -223,13 +254,6 @@
return answer;
}
-
- private UserModel createUserFromLdap(String simpleUserName, SearchResultEntry userEntry) {
- UserModel answer = new UserModel(simpleUserName);
- //If attributes other than user name ever from from LDAP, this is where to get them
-
- return answer;
- }
private SearchResult doSearch(LDAPConnection ldapConnection, String base, String filter) {
try {
@@ -243,6 +267,7 @@
private boolean isAuthenticated(LDAPConnection ldapConnection, String userDn, String password) {
try {
+ // Binding will stop any LDAP-Injection Attacks since the searched-for user needs to bind to that DN
ldapConnection.bind(userDn, password);
return true;
} catch (LDAPException e) {
@@ -263,6 +288,35 @@
if (lastSlash > -1) {
username = username.substring(lastSlash + 1);
}
+
return username;
}
+
+ // From: https://www.owasp.org/index.php/Preventing_LDAP_Injection_in_Java
+ public static final String escapeLDAPSearchFilter(String filter) {
+ StringBuilder sb = new StringBuilder();
+ for (int i = 0; i < filter.length(); i++) {
+ char curChar = filter.charAt(i);
+ switch (curChar) {
+ case '\\':
+ sb.append("\\5c");
+ break;
+ case '*':
+ sb.append("\\2a");
+ break;
+ case '(':
+ sb.append("\\28");
+ break;
+ case ')':
+ sb.append("\\29");
+ break;
+ case '\u0000':
+ sb.append("\\00");
+ break;
+ default:
+ sb.append(curChar);
+ }
+ }
+ return sb.toString();
+ }
}
--
Gitblit v1.9.1