LemonLDAP 介绍
LemonLdap 是 Apache 的一个实现了 Web SSO 的模块，可处理超过 20 万的用户。
主要特性包括：
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SSO for Web applications (Java, PHP, .Net, Perl, Ruby, Python, …).
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Virtual Private Networks for external access (HTTP/HTTPS gateway).
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Strong authentication (LDAP, Kerberos, X.509, CAS, Liberty Alliance).
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Authorization based on LDAP filters.
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Authorizations inside application (subdirectories, or file types).
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LDAP groups management.
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Session sharing (SQL, memcached, SOAP).
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Configuration sharing (SQL, SOAP, LDAP).
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Password policy compliant.
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Dynamic application menu.
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Password change form.
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Push authentication trough HTTP Basic.
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Form replay.
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SAML Service Provider, identity Provider and Attribute Provider.