LDAP Component

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The Lightweight Directory Access Protocol (LDAP) Component is used to search, manage, and maintain internet directory servers.

Syntax

TipaLDAP

Remarks

The LDAP Component supports both plaintext and Secure Sockets Layer/Transport Layer Security (SSL/TLS) connections. When connecting over Secure Sockets Layer/Transport Layer Security (SSL/TLS) the SSLServerAuthentication event allows you to check the server identity and other security attributes. The SSLStatus event provides information about the SSL handshake. Additional SSL-related settings are also supported through the Config method.

The LDAP Component implements a standard LDAP client as specified in RFC 1777, 2251, and other LDAP RFCs. Support for both LDAP v2 and v3 is provided.

The first step in using the component is specifying the ServerName, a DN (distinguished name) to bind as, and optionally a Password. Then you can call one or more of the component methods to act upon the server. Server responses normally are received through the Result event. The only exceptions are search requests that result in one or more SearchResult events, followed by a final SearchComplete event.

Attributes are set and returned through the Attributes properties. Other command arguments are specified through other properties. These are specified in detail in each method.

Search filters are to be specified as string arguments to the Search method. The format must be a standard LDAP search string as specified in RFC 1558. Other search attributes are set in properties, such as SearchScope, SearchTimeLimit, SearchSizeLimit, SearchReturnValues, and SearchDerefAliases.

The component operates synchronously by default (waits for a response before returning control to the caller); however, the component also may operate asynchronously (return control immediately), by setting Timeout to 0. Please refer to the Timeout property for more information.

Property List

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The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the component with short descriptions. Click on the links for further details.

AcceptData Property (LDAP Component)

This property indicates whether data reception is currently enabled.

Syntax

property AcceptData: Boolean read get_AcceptData;

Default Value

true

Remarks

This property indicates whether data reception is currently enabled. When False, data reception is disabled. Use the PauseData and ProcessData methods to pause and resume data reception.

This property is read-only and not available at design time.

Attributes Property (LDAP Component)

This property includes the attributes for the current entry.

Syntax

property Attributes: TipaLDAPAttributeList read get_Attributes write set_Attributes;

Remarks

This property contains a collection of all of the attributes for the current entry. Each attribute's details are found in the fields of the LDAPAttribute type.

After a Search, this property will be populated with the attributes of each search result and can be read within the SearchResult event (one event for each resulting DN).

During a Lightweight Directory Access Protocol (LDAP) Modify operation, this property describes the modifications that are to be made to the attributes. You may specify the attribute, the new value, and the operation to be executed by the server in this property.

This property is not available at design time.

Please refer to the LDAPAttribute type for a complete list of fields.

AuthMechanism Property (LDAP Component)

This property is the authentication mechanism to be used when connecting to the Lightweight Directory Access Protocol (LDAP) server.

Syntax

property AuthMechanism: TipaTLDAPAuthMechanisms read get_AuthMechanism write set_AuthMechanism;

TipaTLDAPAuthMechanisms = (
  lamSimple,
  lamDigestMD5,
  lamNegotiate,
  lamKerberos,
  lamSASLExternal
);

Default Value

lamSimple

Remarks

This property specifies the authentication mechanism used. Possible values are as follows:

Connected Property (LDAP Component)

This property shows whether the component is connected.

Syntax

property Connected: Boolean read get_Connected;

Default Value

false

Remarks

This property is used to determine whether or not the component is connected to the remote host. Use the Bind and Unbind methods to manage the connection.

This property is read-only and not available at design time.

DeleteOldRDN Property (LDAP Component)

This property controls whether the old RDN (Relative Distinguished Name) should be deleted.

Syntax

property DeleteOldRDN: Boolean read get_DeleteOldRDN write set_DeleteOldRDN;

Default Value

true

Remarks

This property controls whether the old RDN should be deleted. It is used when ModifyRDN is called. The default value is True, which instructs the server to delete the old RDN.

This property is not available at design time.

DN Property (LDAP Component)

This property includes the distinguished name used as the base for Lightweight Directory Access Protocol (LDAP) operations.

Syntax

property DN: String read get_DN write set_DN;

Default Value

''

Remarks

This also includes the base object during LDAP searches.

The distinguished name is provided in string format, as specified by RFC 1779. Example. Setting DN:

LDAPControl.DN = "uid=TThompson,ou=Employees,dc=server" LDAPControl.DN = "Domain\Username"

Firewall Property (LDAP Component)

A set of properties related to firewall access.

Syntax

property Firewall: TipaFirewall read get_Firewall write set_Firewall;

Remarks

This is a Firewall-type property, which contains fields describing the firewall through which the component will attempt to connect.

Please refer to the Firewall type for a complete list of fields.

Idle Property (LDAP Component)

The current status of the component.

Syntax

property Idle: Boolean read get_Idle;

Default Value

true

Remarks

This property will be False if the component is currently busy (communicating or waiting for an answer), and True at all other times.

This property is read-only.

LDAPVersion Property (LDAP Component)

The version of the Lightweight Directory Access Protocol (LDAP) used.

Syntax

property LDAPVersion: Integer read get_LDAPVersion write set_LDAPVersion;

Default Value

3

Remarks

This property contains the version of LDAP used. The default value is 3 (for LDAPv3).

This property is not available at design time.

LocalHost Property (LDAP Component)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

property LocalHost: String read get_LocalHost write set_LocalHost;

Default Value

''

Remarks

This property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the component initiate connections (or accept in the case of server components) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the component is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

Note: LocalHost is not persistent. You must always set it in code, and never in the property window.

MessageId Property (LDAP Component)

This property includes the message identifier for the next Lightweight Directory Access Protocol (LDAP) request.

Syntax

property MessageId: Integer read get_MessageId write set_MessageId;

Default Value

1

Remarks

This property contains the message identifier for the next LDAP request. If a custom value is needed, this property must be set before calling any other methods. The component increments this property automatically after each request.

This property is not available at design time.

PageSize Property (LDAP Component)

This property includes the maximum number of results per page for the Search method.

Syntax

property PageSize: Integer read get_PageSize write set_PageSize;

Default Value

0

Remarks

This property contains the maximum number of results per page for the Search method. The default value is 0 (no paging). If set to a value greater than zero, results will be paged, that is, returned in blocks of maximum PageSize results.

For each page sent by the server, a SearchPage event will fire. You may decide to cancel or continue displaying results from within this event.

Note: Lightweight Directory Access Protocol (LDAP) paging functionality is described by LDAP extension RFCs and may or may not be implemented by the LDAP server being accessed.

Password Property (LDAP Component)

This property includes the password used to authenticate to the Lightweight Directory Access Protocol (LDAP) server.

Syntax

property Password: String read get_Password write set_Password;

Default Value

''

Remarks

This property contains the password used to authenticate to the LDAP server. Leave this value empty if no password is required.

This property is not available at design time.

References Property (LDAP Component)

This property includes a collection of references returned from the server.

Syntax

property References: TipaLDAPReferenceList read get_References;

Remarks

This property contains a collection of references returned from the server. References will be SearchResult references if inside a SearchResult or SearchResultReference event. In this case, they represent URLs to contact to continue the search. References will be regular result references if inside the Result event or SearchComplete event. In this case, they represent the URLs to contact to complete the requested operation.

This property is read-only and not available at design time.

Please refer to the LDAPReference type for a complete list of fields.

ResultCode Property (LDAP Component)

This property includes the result code returned in the last server response.

Syntax

property ResultCode: Integer read get_ResultCode;

Default Value

0

Remarks

This property contains the result code returned in the last server response. This is identical to the corresponding parameter provided by the last Result, SearchResult, or SearchComplete event.

Possible result codes are as follows:

All the result codes with the exception of success, compareFalse and compareTrue are to be treated as meaning the operation could not be completed in its entirety. Result codes from 16 to 21 indicate an AttributeProblem; codes 32, 33, 34, and 36 indicate a NameProblem; codes 48, 49, and 50 indicate a SecurityProblem; codes 51 to 54 indicate a ServiceProblem; and codes 64 to 69 and 71 indicate an UpdateProblem.

This property is read-only.

ResultDescription Property (LDAP Component)

This property includes the descriptive text returned in the last server response (if any).

Syntax

property ResultDescription: String read get_ResultDescription;

Default Value

''

Remarks

This property contains the descriptive text returned in the last server response (if any). This is identical to the corresponding parameter provided by the last Result, SearchResult, or SearchComplete event.

This property is read-only.

ResultDN Property (LDAP Component)

This property includes the distinguished name returned in the last server response (if any).

Syntax

property ResultDN: String read get_ResultDN;

Default Value

''

Remarks

This property contains the distinguished name returned in the last server response (if any). This is identical to the corresponding parameter provided by the last Result or SearchComplete event.

This property is read-only.

SearchDerefAliases Property (LDAP Component)

This property controls alias dereferencing during searching.

Syntax

property SearchDerefAliases: TipaTLDAPDerefAliases read get_SearchDerefAliases write set_SearchDerefAliases;

TipaTLDAPDerefAliases = (
  sdaNever,
  sdaInSearching,
  sdaFindingBaseObject,
  sdaAlways
);

Default Value

sdaNever

Remarks

This property controls the alias dereferencing during searching. The possible values are as follows:

The default is to never dereference aliases.

SearchReturnValues Property (LDAP Component)

This property controls whether the search operation returns values of attributes or only types.

Syntax

property SearchReturnValues: Boolean read get_SearchReturnValues write set_SearchReturnValues;

Default Value

true

Remarks

This property controls whether the search operation returns values of attributes or only types. If only attributes are needed, disabling the property to return values will enhance performance.

SearchScope Property (LDAP Component)

This property controls the scope of Lightweight Directory Access Protocol (LDAP) search operations.

Syntax

property SearchScope: TipaTLDAPSearchScopes read get_SearchScope write set_SearchScope;

TipaTLDAPSearchScopes = (
  ssBaseObject,
  ssSingleLevel,
  ssWholeSubtree
);

Default Value

ssWholeSubtree

Remarks

This property controls the scope of LDAP search operations. Possible values are as follows:

The default is to search the whole subtree.

SearchSizeLimit Property (LDAP Component)

This property includes the maximum number of entries that can be returned by the next search operation.

Syntax

property SearchSizeLimit: Integer read get_SearchSizeLimit write set_SearchSizeLimit;

Default Value

0

Remarks

This property contains the maximum number of entries that can be returned by the next search operation. This limit is provided as a hint to the directory server. A value of 0 means that no size limits are in effect for the search.

SearchTimeLimit Property (LDAP Component)

This property includes a time limit for the next search operation (in seconds).

Syntax

property SearchTimeLimit: Integer read get_SearchTimeLimit write set_SearchTimeLimit;

Default Value

0

Remarks

This property contains a time limit for the next search operation (in seconds). This limit is provided as a hint to the directory server. A value of 0 means that no time limits are in effect for the search.

ServerName Property (LDAP Component)

This property includes the name or address of the Lightweight Directory Access Protocol (LDAP) server.

Syntax

property ServerName: String read get_ServerName write set_ServerName;

Default Value

''

Remarks

This property specifies the IP address (IP number in dotted internet format) or the domain name of the directory server. It is set before a connection is attempted and cannot be changed once a connection is in progress.

If this property is set to a domain name, a DNS request is initiated, and upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, an error is returned.

ServerPort Property (LDAP Component)

This property includes the server port for the Lightweight Directory Access Protocol (LDAP) connection (the default is 389).

Syntax

property ServerPort: Integer read get_ServerPort write set_ServerPort;

Default Value

389

Remarks

This property contains the server port for the LDAP connection (the default is 389).

For the implicit Secure Sockets Layer (SSL), use port 636 (please refer to the SSLStartMode property for more information).

A valid port number (a value between 1 and 65535) is required for the connection to take place. The property must be set before a connection is attempted and cannot be changed once a connection is established. Any attempt to change this property while connected will fail with an error.

This property is not available at design time.

SortAttributes Property (LDAP Component)

This property includes a string of attribute names to sort on with optional relative matching rules.

Syntax

property SortAttributes: String read get_SortAttributes write set_SortAttributes;

Default Value

''

Remarks

This property contains a string of attribute names to sort on with optional relative matching rules. When set before a Search, entries returned by the server will be sorted according to SortAttributes. The format consists of one or more attribute names separated by spaces. Each attribute may be followed by an optional matching rule.

If matching rules are defined, they should be separated from the attribute names with a "/".

Normally, the values are returned in ascending order. If descending (reverse) order of sorting is desired, the attribute type must be preceded with a "-".

Following are examples:

LDAPControl.SortAttributes = "loginTime" LDAPControl.SortAttributes = "name/caseIgnoreSubstringsMatch age/numericStringSubstringsMatch" LDAPControl.SortAttributes = "cn age/1.3.6.1.4.1.1466.115.121.1.27" LDAPControl.SortAttributes = "-cn age/1.3.6.1.4.1.1466.115.121.1.27" Example 1. Matching Rules for Equality Filters:

Example 2. Matching Rules for Inequality Filters: Example 3. Matching Rules for Substring Filters: Example 4. Matching Rules for Subschema Attributes:

SSLAcceptServerCert Property (LDAP Component)

Instructs the component to unconditionally accept the server certificate that matches the supplied certificate.

Syntax

property SSLAcceptServerCert: TipaCertificate read get_SSLAcceptServerCert write set_SSLAcceptServerCert;

Remarks

If it finds any issues with the certificate presented by the server, the component will normally terminate the connection with an error.

You may override this behavior by supplying a value for SSLAcceptServerCert. If the certificate supplied in SSLAcceptServerCert is the same as the certificate presented by the server, then the server certificate is accepted unconditionally, and the connection will continue normally.

Note: This functionality is provided only for cases in which you otherwise know that you are communicating with the right server. If used improperly, this property may create a security breach. Use it at your own risk.

Please refer to the Certificate type for a complete list of fields.

SSLCert Property (LDAP Component)

The certificate to be used during Secure Sockets Layer (SSL) negotiation.

Syntax

property SSLCert: TipaCertificate read get_SSLCert write set_SSLCert;

Remarks

This property includes the digital certificate that the component will use during SSL negotiation. Set this property to a valid certificate before starting SSL negotiation. To set a certificate, you may set the Encoded field to the encoded certificate. To select a certificate, use the store and subject fields.

Please refer to the Certificate type for a complete list of fields.

SSLEnabled Property (LDAP Component)

This property indicates whether Transport Layer Security/Secure Sockets Layer (TLS/SSL) is enabled.

Syntax

property SSLEnabled: Boolean read get_SSLEnabled write set_SSLEnabled;

Default Value

false

Remarks

This property specifies whether TLS/SSL is enabled in the component. When False (default), the component operates in plaintext mode. When True, TLS/SSL is enabled.

TLS/SSL may also be enabled by setting SSLStartMode. Setting SSLStartMode will automatically update this property value.

This property is not available at design time.

SSLProvider Property (LDAP Component)

The Secure Sockets Layer/Transport Layer Security (SSL/TLS) implementation to use.

Syntax

property SSLProvider: TipaTSSLProviders read get_SSLProvider write set_SSLProvider;

TipaTSSLProviders = (
  sslpAutomatic,
  sslpPlatform,
  sslpInternal
);

Default Value

sslpAutomatic

Remarks

This property specifies the SSL/TLS implementation to use. In most cases the default value of 0 (Automatic) is recommended and should not be changed. When set to 0 (Automatic), the component will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used.

Possible values are as follows:

Additional Notes

In most cases using the default value (Automatic) is recommended. The component will select a provider depending on the current platform.

When Automatic is selected, on Windows, the component will use the platform implementation. On Linux/macOS, the component will use the internal implementation. When TLS 1.3 is enabled via SSLEnabledProtocols, the internal implementation is used on all platforms.

SSLServerCert Property (LDAP Component)

The server certificate for the last established connection.

Syntax

property SSLServerCert: TipaCertificate read get_SSLServerCert;

Remarks

This property contains the server certificate for the last established connection.

SSLServerCert is reset every time a new connection is attempted.

This property is read-only.

Please refer to the Certificate type for a complete list of fields.

SSLStartMode Property (LDAP Component)

This property determines how the component starts the Secure Sockets Layer (SSL) negotiation.

Syntax

property SSLStartMode: TipaTSSLStartModes read get_SSLStartMode write set_SSLStartMode;

TipaTSSLStartModes = (
  sslAutomatic,
  sslImplicit,
  sslExplicit,
  sslNone
);

Default Value

sslNone

Remarks

The SSLStartMode property may have one of the following values:

Timeout Property (LDAP Component)

This property includes the timeout for the component.

Syntax

property Timeout: Integer read get_Timeout write set_Timeout;

Default Value

60

Remarks

If the Timeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If Timeout is set to a positive value, data is sent in a blocking manner and the component will wait for the operation to complete before returning control. The component will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of Timeout seconds.

The component will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive.

If Timeout expires, and the operation is not yet complete, the component raises an exception.

Note: By default, all timeouts are inactivity timeouts, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

Abandon Method (LDAP Component)

This method asks the server to abandon a request.

Syntax

procedure Abandon(MessageId: Integer);

Remarks

This method asks the server to abandon the request specified by MessageId. The result of the operation is returned through the Result event.

Add Method (LDAP Component)

This method adds an entry specified by DN to the directory server using the type and value attributes defined in the Attributes properties.

Syntax

procedure Add();

Remarks

This method adds the entry specified by DN to the directory. All entries are required to have an objectClass attribute.

To add a new entry, first Bind with credentials that will allow you to perform the new addition. To add attributes instead of entries, use the Modify method instead. When specifying multivalued attributes, specify the attribute type only in the first occurrence of that attribute type in the Attributes properties. Additional instances of the same attribute type should specify an attribute type of an empty string.

The result of the operation is returned through the Result event.

Example. Add a New Entry (including the multivalued objectClass attribute):

LDAPControl.DN = "uid=NewUser,ou=Employees,dc=server" LDAPControl.AttributeCount = 7 LDAPControl.AttributeType(0) = "objectClass" LDAPControl.AttributeValue(0) = "top" LDAPControl.AttributeType(1) = "" LDAPControl.AttributeValue(1) = "person" LDAPControl.AttributeType(2) = "" LDAPControl.AttributeValue(2) = "organizationalPerson" LDAPControl.AttributeType(3) = "" LDAPControl.AttributeValue(3) = "inetOrgPerson" LDAPControl.AttributeType(4) = "sn" LDAPControl.AttributeValue(4) = "UserName" LDAPControl.AttributeType(5) = "cn" LDAPControl.AttributeValue(5) = "New S. UserName" LDAPControl.AttributeType(6) = "uid" LDAPControl.AttributeValue(6) = "NewUser" LDAPControl.Add()

Attr Method (LDAP Component)

This method returns the value of the specified Lightweight Directory Access Protocol (LDAP) attribute.

Syntax

function Attr(AttrType: String): String;

Remarks

This method returns the value of the specified LDAP attribute. If the attribute does not exist, an empty string is returned.

Please refer to the Attributes properties for more information.

Bind Method (LDAP Component)

This method connects and binds to the directory server.

Syntax

procedure Bind();

Remarks

This method connects and binds to the directory server. If the Password property has a value, it is used for authentication. If not, the bind is performed anonymously. Binding is often required on some directory servers, like Active Directory. The result of the operation is returned through the Result event.

Example. Binding:

LDAPControl.DN = "uid=TThompson,ou=Employees,dc=server" LDAPControl.Password = "mypassword" LDAPControl.Bind() LDAPControl.DN = "Domain/Username" LDAPControl.Password = "mypassword" LDAPControl.Bind()

ChangePassword Method (LDAP Component)

This method changes the password for the specified user.

Syntax

procedure ChangePassword(user: String; oldPassword: String; newPassword: String);

Remarks

This method changes the password for the specified user.

The User parameter is the name of the user for which the password will be changed. OldPassword specifies the current password and NewPassword specifies the new password.

Note: This operation can be performed only over the Secure Sockets Layer (SSL) port. Set ServerPort to the SSL port of the server (typically 636) before calling this method.

Note: If the user is an administrator, the old password is not required.

Compare Method (LDAP Component)

This method compares attributes and values with those of the entry specified by DN .

Syntax

procedure Compare();

Remarks

This method compares attribute types and values specified via the Attributes properties, with the values in the directory for the entry specified by DN. The result of the operation is returned through the Result event.

Config Method (LDAP Component)

Sets or retrieves a configuration setting.

Syntax

function Config(ConfigurationString: String): String;

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Connect Method (LDAP Component)

This method connects to the directory server without performing any action.

Syntax

procedure Connect();

Remarks

This method establishes a connection with the directory server specified by ServerName. In most cases, it is recommended to use the Bind method, which will both establish a connection and bind to the directory server.

This method may be useful in cases in which it is desirable to establish a connection without performing any operation (e.g., when testing connectivity).

Delete Method (LDAP Component)

Deletes an entry specified by DN from the directory server.

Syntax

procedure Delete();

Remarks

This method deletes the entry specified by DN from the directory. The result of the operation is returned through the Result event.

DoEvents Method (LDAP Component)

This method processes events from the internal message queue.

Syntax

procedure DoEvents();

Remarks

When DoEvents is called, the component processes any available events. If no events are available, it waits for a preset period of time, and then returns.

ExtendedRequest Method (LDAP Component)

This method performs a Lightweight Directory Access Protocol (LDAP) V3 extended operation.

Syntax

procedure ExtendedRequest(RequestName: String; RequestValue: TBytes);

Remarks

This method performs an LDAP V3 extended operation. RequestName must contain the object identifier of the operation, and RequestValue may contain an optional value.

Interrupt Method (LDAP Component)

This method interrupts the current method.

Syntax

procedure Interrupt();

Remarks

If there is no method in progress, Interrupt simply returns, doing nothing.

ListComputers Method (LDAP Component)

This method lists all computers in the directory.

Syntax

procedure ListComputers();

Remarks

This method lists all computers in the directory. The ComputerList event will be fired once for each computer returned.

ListGroupMembers Method (LDAP Component)

This method lists all members of a group.

Syntax

procedure ListGroupMembers(group: String);

Remarks

This method lists all members of the specified group. The UserList event will be fired once for each member returned.

ListGroups Method (LDAP Component)

This method list all groups in the directory.

Syntax

procedure ListGroups();

Remarks

This method lists all groups in the directory. The GroupList event will be fired once for each group returned.

ListUserGroups Method (LDAP Component)

This method lists all groups a user is a part of.

Syntax

procedure ListUserGroups(user: String);

Remarks

This method lists all groups that the user specified by user is a part of. The GroupList event will fire once for each group the user is a part of.

Modify Method (LDAP Component)

This method performs a Lightweight Directory Access Protocol (LDAP) modify operation on the entry specified by DN .

Syntax

procedure Modify();

Remarks

This method performs an LDAP modify operation on the entry specified by DN. The attributes to modify should be set via the Attributes properties. When specifying multivalued attributes, specify the attribute type only in the first occurrence of that attribute type in the Attributes properties. Additional instances of the same attribute type should specify an attribute type of an empty string.

The modification can be a replacement, an addition, or a deletion, depending on the ModOp field of the attribute;. The result of the operation is returned through the Result event.

Example. Modify an Entry (Replace an Attribute Value):

LDAPControl.DN = "uid=TThompson,ou=Employees,dc=server" LDAPControl.AttributeCount = 2 LDAPControl.AttributeType(0) = "url" LDAPControl.AttributeValue(0) = "www.url1.net" LDAPControl.AttributeModOp(0) = amoReplace LDAPControl.AttributeType(0) = "" LDAPControl.AttributeValue(0) = "www.url2.net" LDAPControl.AttributeModOp(0) = amoReplace LDAPControl.Modify()

ModifyRDN Method (LDAP Component)

This method performs a Lightweight Directory Access Protocol (LDAP) modify RDN operation on an entry specified by DN .

Syntax

procedure ModifyRDN(NewRDN: String);

Remarks

This method performs an LDAP modify RDN operation on the entry specified by DN.

NewRDN is the new RDN for the entry specified by DN

The result of the operation is returned through the Result event.

MoveToDN Method (LDAP Component)

This method performs a Lightweight Directory Access Protocol (LDAP) modify operation on the entry specified by DN by changing its superior.

Syntax

procedure MoveToDN(NewSuperior: String);

Remarks

This method performs an LDAP modify operation on the entry specified by DN by changing its superior.

Note: None of the entry's attributes will change. DeleteOldRDN property will be set to True to delete the old entry. The result of the operation is returned through the Result event.

PauseData Method (LDAP Component)

This method pauses data reception.

Syntax

procedure PauseData();

Remarks

This method pauses data reception when called. While data reception is paused, incoming data will not be processed and events will not fire. Call ProcessData to re-enable data reception.

ProcessData Method (LDAP Component)

This method re-enables data reception after a call to PauseData .

Syntax

procedure ProcessData();

Remarks

This method re-enables data reception after a previous call to PauseData. Call this method to re-enable data reception and allow IPPacket to fire.

Note: This method is used only after previously calling PauseData. It does not need to be called to process data by default.

Reset Method (LDAP Component)

This method will reset the component.

Syntax

procedure Reset();

Remarks

This method will reset the component's properties to their default values.

Search Method (LDAP Component)

This method searches the directory server using the base object specified in DN and the search filter SearchFilter .

Syntax

procedure Search(SearchFilter: String);

Remarks

This method searches the directory server using the base object specified in the DN and the search filter specified in the SearchFilter parameter. Additional search parameters are specified through the SearchScope, SearchDerefAliases, SearchSizeLimit, SearchTimeLimit, and SearchReturnValues properties.

If Attributes are specified before starting a search, the server will return only those results that contain a value for the specified attributes.

Results are returned through zero or more SearchResult events, after which a SearchComplete event is fired.

Example 1. Searching for a User:

LDAPControl.DN = "ou=Employees,dc=server" LDAPControl.Search("uid=TThompson")

A Directory-Specific Entries (DSE) search will search for the attributes of the server. Example 2. DSE Search:

LDAPControl.DN = "" LDAPControl.SearchScope = 0 LDAPControl.Search("objectClass=*")

SearchFilter is a string representation of the Lightweight Directory Access Protocol (LDAP) search filter used for the search.

The format of the search filter is specified by RFC 1558 and is identical to the format used by most LDAP applications.

The following are examples of search filters, as provided in the RFC:

Example 3. Search Filters:

     (cn=Babs Jensen)
     (!(cn=Tim Howes))
     (&(objectClass=Person)(|(sn=Jensen)(cn=Babs J*)))
     (o=univ*of*mich*)

The complete specification is given by the following BNF:

     <filter> ::= "(" <filtercomp> ")"
     <filtercomp> ::= <and> | <or> | <not> | <item>
     <and> ::= "&" <filterlist>
     <or> ::= "|" <filterlist>
     <not> ::= "!" <filter>
     <filterlist> ::= <filter> | <filter> <filterlist>
     <item> ::= <simple> | <present> | <substring>
     <simple> ::= <attr> <filtertype> <value>
     <filtertype> ::= <equal> | <approx> | <greater> | <less>
     <equal> ::= "="
     <approx> ::= "~="
     <greater> ::= ">="
     <less> ::= "<="
     <present> ::= <attr> "=*"
     <substring> ::= <attr> "=" <initial> <any> <final>
     <initial> ::= NULL | <value>
     <any> ::= "*" <starval>
     <starval> ::= NULL | <value> "*" <starval>
     <final> ::= NULL | <value>

<attr> is a string representing an attribute type as defined in RFC 1777. <value> is a string representing an attribute value, or part of one, and has the form defined in RFC 1779. If a <value> must contain one of the characters '*' or '(' or ')', these should be escaped by preceding them with the backslash '\' character.

Unbind Method (LDAP Component)

This method unbinds from the directory server.

Syntax

procedure Unbind();

Remarks

This method unbinds from the directory server and breaks the connection.

ComputerList Event (LDAP Component)

This event is fired for each computer entry returned.

Syntax

type TComputerListEvent = procedure (
  Sender: TObject;
  const name: String;
  const operatingSystem: String;
  const lastLogon: String;
  logonCount: Integer;
  const dn: String
) of Object;

property OnComputerList: TComputerListEvent read FOnComputerList write FOnComputerList;

Remarks

This event is fired once for each computer returned when the ListComputers method is called.

Connected Event (LDAP Component)

Fired immediately after a connection completes (or fails).

Syntax

type TConnectedEvent = procedure (
  Sender: TObject;
  StatusCode: Integer;
  const Description: String
) of Object;

property OnConnected: TConnectedEvent read FOnConnected write FOnConnected;

Remarks

If the connection is made normally, StatusCode is 0 and Description is 'OK'.

If the connection fails, StatusCode has the error code returned by the Transmission Control Protocol (TCP)/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error.

Please refer to the Error Codes section for more information.

ConnectionStatus Event (LDAP Component)

Fired to indicate changes in the connection state.

Syntax

type TConnectionStatusEvent = procedure (
  Sender: TObject;
  const ConnectionEvent: String;
  StatusCode: Integer;
  const Description: String
) of Object;

property OnConnectionStatus: TConnectionStatusEvent read FOnConnectionStatus write FOnConnectionStatus;

Remarks

This event is fired when the connection state changes: for example, completion of a firewall or proxy connection or completion of a security handshake.

The ConnectionEvent parameter indicates the type of connection event. Values may include the following:

StatusCode has the error code returned by the Transmission Control Protocol (TCP)/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error.

Disconnected Event (LDAP Component)

Fired when a connection is closed.

Syntax

type TDisconnectedEvent = procedure (
  Sender: TObject;
  StatusCode: Integer;
  const Description: String
) of Object;

property OnDisconnected: TDisconnectedEvent read FOnDisconnected write FOnDisconnected;

Remarks

If the connection is broken normally, StatusCode is 0 and Description is 'OK'.

If the connection is broken for any other reason, StatusCode has the error code returned by the Transmission Control Protocol (TCP/IP) subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error.

Please refer to the Error Codes section for more information.

Error Event (LDAP Component)

Fired when information is available about errors during data delivery.

Syntax

type TErrorEvent = procedure (
  Sender: TObject;
  ErrorCode: Integer;
  const Description: String
) of Object;

property OnError: TErrorEvent read FOnError write FOnError;

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component raises an exception.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ExtendedResponse Event (LDAP Component)

This event is fired for Lightweight Directory Access Protocol (LDAP) V3 extended responses.

Syntax

type TExtendedResponseEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const DN: String;
  ResultCode: Integer;
  const ResultDescription: String;
  const ResponseName: String;
  const ResponseValue: String;
  const ResponseValueB: TBytes
) of Object;

property OnExtendedResponse: TExtendedResponseEvent read FOnExtendedResponse write FOnExtendedResponse;

Remarks

The first four parameters are the same as the parameters of the Result event. ResponseName and ResponseValue are related to the corresponding parameters of the call to ExtendedRequest.

GroupList Event (LDAP Component)

This event is fired for each group entry returned.

Syntax

type TGroupListEvent = procedure (
  Sender: TObject;
  const name: String;
  const description: String;
  const dn: String
) of Object;

property OnGroupList: TGroupListEvent read FOnGroupList write FOnGroupList;

Remarks

This event is fired once for each group entry returned when either of the ListGroups or ListUserGroups methods are called.

PITrail Event (LDAP Component)

This event provides detailed information about the interaction with the server.

Syntax

type TPITrailEvent = procedure (
  Sender: TObject;
  Direction: Integer;
  const Description: String;
  const Message: String
) of Object;

property OnPITrail: TPITrailEvent read FOnPITrail write FOnPITrail;

Remarks

The PITrail event provides detailed information about all communication with the server. This is useful for debugging purposes.

Direction specifies the origin of the data. Possible values are as follows:

• 0 - Client
• 1 - Server

Description is a short description of the current packet. This is human readable and useful for informational logging.

Message contains a hex-encoded version of the raw message. This represents the exact value sent over the wire.

Result Event (LDAP Component)

This event is fired for every server response, except for search responses.

Syntax

type TResultEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const DN: String;
  ResultCode: Integer;
  const ResultDescription: String
) of Object;

property OnResult: TResultEvent read FOnResult write FOnResult;

Remarks

The MessageId parameter identifies the corresponding request. ResultCode and ResultDescription show whether or not the operation was successful (on a successful operation, the ResultCode is 0). For a full list of possible result codes, see the ResultCode property.

SearchComplete Event (LDAP Component)

This event is fired upon completion of a search operation.

Syntax

type TSearchCompleteEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const DN: String;
  ResultCode: Integer;
  const ResultDescription: String
) of Object;

property OnSearchComplete: TSearchCompleteEvent read FOnSearchComplete write FOnSearchComplete;

Remarks

The MessageId parameter identifies the corresponding request. ResultCode and ResultDescription show whether the operation was successful (on a successful operation, the ResultCode is 0).

SearchPage Event (LDAP Component)

This event is fired for every page returned from a search operation.

Syntax

type TSearchPageEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const DN: String;
  ResultCode: Integer;
  const ResultDescription: String;
  var CancelSearch: Boolean
) of Object;

property OnSearchPage: TSearchPageEvent read FOnSearchPage write FOnSearchPage;

Remarks

This event is fired so the client can decide whether or not to continue with the Search operation. The signature is very similar to the SearchComplete event, with the addition of a CancelSearch parameter. If the search should be canceled (no more pages), the CancelSearch parameter should be set to True.

SearchResult Event (LDAP Component)

This event is fired for every entry returned from a search operation.

Syntax

type TSearchResultEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const DN: String
) of Object;

property OnSearchResult: TSearchResultEvent read FOnSearchResult write FOnSearchResult;

Remarks

MessageId identifies the corresponding search request. DN contains the distinguished name of the entry. The attribute type and value provided in the Attributes properties show the list of retrieved attributes for the entry.

Every search operation results in a sequence of 0 or more SearchResult events and a sequence of 0 or more SearchResultReference events, which are followed by a SearchComplete event.

SearchResultReference Event (LDAP Component)

This event is fired for every result reference returned from a search operation.

Syntax

type TSearchResultReferenceEvent = procedure (
  Sender: TObject;
  MessageId: Integer;
  const LdapUrl: String
) of Object;

property OnSearchResultReference: TSearchResultReferenceEvent read FOnSearchResultReference write FOnSearchResultReference;

Remarks

MessageId identifies the corresponding search request. LdapUrl contains a URL reference to a server that can be used for continuing the search operation.

Every search operation results in a sequence of 0 or more SearchResult events and a sequence of 0 or more SearchResultReference events, which are followed by a SearchComplete event.

SSLServerAuthentication Event (LDAP Component)

Fired after the server presents its certificate to the client.

Syntax

type TSSLServerAuthenticationEvent = procedure (
  Sender: TObject;
  const CertEncoded: String;
  const CertEncodedB: TBytes;
  const CertSubject: String;
  const CertIssuer: String;
  const Status: String;
  var Accept: Boolean
) of Object;

property OnSSLServerAuthentication: TSSLServerAuthenticationEvent read FOnSSLServerAuthentication write FOnSSLServerAuthentication;

Remarks

During this event, the client can decide whether or not to continue with the connection process. The Accept parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

When Accept is False, Status shows why the verification failed (otherwise, Status contains the string OK). If it is decided to continue, you can override and accept the certificate by setting the Accept parameter to True.

SSLStatus Event (LDAP Component)

Fired when secure connection progress messages are available.

Syntax

type TSSLStatusEvent = procedure (
  Sender: TObject;
  const Message: String
) of Object;

property OnSSLStatus: TSSLStatusEvent read FOnSSLStatus write FOnSSLStatus;

Remarks

The event is fired for informational and logging purposes only. This event tracks the progress of the connection.

UserList Event (LDAP Component)

This event is fired once for each user entry returned.

Syntax

type TUserListEvent = procedure (
  Sender: TObject;
  const name: String;
  const description: String;
  const lastLogon: String;
  const memberOf: String;
  const dn: String
) of Object;

property OnUserList: TUserListEvent read FOnUserList write FOnUserList;

Remarks

This event is fired once for each user entry returned when the ListGroupMembers method is called.

Certificate Type

This is the digital certificate being used.

Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

Fields

Constructors

>

constructor Create();

>

constructor Create(valEncoded: TBytes);

>

constructor Create(valStoreType: TipaCertStoreTypes; valStore: String; valStorePassword: String; valSubject: String);

>

constructor Create(valStoreType: TipaCertStoreTypes; valStore: TBytes; valStorePassword: String; valSubject: String);

Firewall Type

The firewall the component will connect through.

Remarks

When connecting through a firewall, this type is used to specify different properties of the firewall, such as the firewall Host and the FirewallType.

Fields

Constructors

constructor Create();

LDAPAttribute Type

This types describes an attribute for the current entry.

Remarks

This type describes an attribute for the current Lightweight Directory Access Protocol (LDAP) entry. The ModOp field is used only in Modify operations.

Fields

Constructors

constructor Create();

constructor Create(valAttributeType: String);

LDAPReference Type

This type includes a reference returned from the server.

Remarks

This type describes a Lightweight Directory Access Protocol (LDAP) reference, which may be queried inside the SearchResult, SearchResultReference, Result, or SearchComplete events.

When inside a SearchResult or SearchResultReference event, references will be a search result reference (that is, a continuation reference), in which case they represent the URLs to contact to continue the search.

When inside a Result or SearchComplete event, a reference will be a regular referral, in which case it represents the URL to contact to complete the requested operation.

Fields

Constructors

constructor Create();

Config Settings (LDAP Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

LDAP Config Settings

TCPClient Config Settings

Socket Config Settings

Base Config Settings

Trappable Errors (LDAP Component)

LDAP Errors

The component may also return one of the following error codes, which are inherited from other components.

TCPClient Errors

TCP/IP Errors