The password hash synchronization agent’s use of MD5 is strictly for replication protocol compatibility with the DC, and it is only used on-premises between the DC and the password hash synchronization agent. The password hash synchronization agent never has access to the clear text password. After the password hash synchronization agent has the encrypted envelope, it uses MD5CryptoServiceProvider and the salt to generate a key to decrypt the received data back to its original MD4 format.The DC also passes the salt to the synchronization agent by using the DC replication protocol, so the agent will be able to decrypt the envelope. It then sends the result to the password hash synchronization agent over RPC. Before sending, the DC encrypts the MD4 password hash by using a key that is a MD5 hash of the RPC session key and a salt.The service account must have Replicate Directory Changes and Replicate Directory Changes All AD permissions (granted by default on installation) to obtain the password hashes. This request is via the standard MS-DRSR replication protocol used to synchronize data between DCs. Every two minutes, the password hash synchronization agent on the AD Connect server requests stored password hashes (the unicodePwd attribute) from a DC.The following section describes, in-depth, how password hash synchronization works between Active Directory and Azure AD. Detailed description of how password hash synchronization works It is not supported for the iNetOrgPerson object type. Password sync is only supported for the object type user in Active Directory. In addition, you can reduce password prompts by turning on Seamless SSO, which automatically signs users in when they are on their corporate devices connected to your corporate network. KMSI behavior can be enabled or disabled by the Azure AD administrator. This selection sets a session cookie that bypasses authentication for 180 days. This pattern can be minimized, however, if the user selects the Keep me signed in (KMSI) check box at sign-in. However, when the cloud service requires you to authenticate again, you need to provide your new password.Ī user must enter their corporate credentials a second time to authenticate to Azure AD, regardless of whether they're signed in to their corporate network. Your current cloud service session is not immediately affected by a synchronized password change that occurs, while you are signed in, to a cloud service. The synchronization of a password has no impact on the user who is currently signed in. If an error occurs during an attempt to synchronize a password, an error is logged in your event viewer. The password hash synchronization feature automatically retries failed synchronization attempts. When you change an on-premises password, the updated password is synchronized, most often in a matter of minutes. However, if there are multiple connectors, it is possible to disable password hash sync for some connectors but not others using the Set-ADSyncAADPasswordSyncConfiguration cmdlet. You cannot explicitly define a subset of user passwords that you want to synchronize. The first time you enable the password hash synchronization feature, it performs an initial synchronization of the passwords of all in-scope users. When you synchronize a password, it overwrites the existing cloud password. You cannot modify the frequency of this process. The password hash synchronization process runs every 2 minutes. However, passwords are synchronized more frequently than the standard directory synchronization window for other attributes. The actual data flow of the password hash synchronization process is similar to the synchronization of user data. Passwords are synchronized on a per-user basis and in chronological order. Extra security processing is applied to the password hash before it is synchronized to the Azure Active Directory authentication service. To synchronize your password, Azure AD Connect sync extracts your password hash from the on-premises Active Directory instance. There is no method to revert the result of a one-way function to the plain text version of a password. A hash value is a result of a one-way mathematical function (the hashing algorithm). The Active Directory domain service stores passwords in the form of a hash value representation, of the actual user password. This article provides information that you need to synchronize your user passwords from an on-premises Active Directory instance to a cloud-based Azure Active Directory (Azure AD) instance.
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