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// Licensed under the MIT License.
#region Using directives
using System;
using System.Collections.Generic;
using System.Management.Automation;
using System.Security.Principal;
using System.Management.Automation.SecurityAccountsManager;
using System.Management.Automation.SecurityAccountsManager.Extensions;
#endregion
namespace Microsoft.PowerShell.Commands
{
/// <summary>
/// The Get-LocalGroupMember cmdlet gets the members of a local group.
/// </summary>
[Cmdlet(VerbsCommon.Get, "LocalGroupMember",
DefaultParameterSetName = "Default",
HelpUri = "https://go.microsoft.com/fwlink/?LinkId=717988")]
[Alias("glgm")]
public class GetLocalGroupMemberCommand : Cmdlet
{
#region Instance Data
private Sam sam = null;
#endregion Instance Data
#region Parameter Properties
/// <summary>
/// The following is the definition of the input parameter "Group".
/// The security group from the local Security Accounts Manager.
/// </summary>
[Parameter(Mandatory = true,
Position = 0,
ValueFromPipeline = true,
ValueFromPipelineByPropertyName = true,
ParameterSetName = "Group")]
[ValidateNotNull]
public Microsoft.PowerShell.Commands.LocalGroup Group
{
get { return this.group;}
set { this.group = value; }
}
private Microsoft.PowerShell.Commands.LocalGroup group;
/// <summary>
/// The following is the definition of the input parameter "Member".
/// Specifies the name of the user or group that is a member of this group. If
/// this parameter is not specified, all members of the specified group are
/// returned. This accepts a name, SID, or wildcard string.
/// </summary>
[Parameter(Position = 1)]
[ValidateNotNullOrEmpty]
public string Member
{
get { return this.member;}
set { this.member = value; }
}
private string member;
/// <summary>
/// The following is the definition of the input parameter "Name".
/// The security group from the local Security Accounts Manager.
/// </summary>
[Parameter(Mandatory = true,
Position = 0,
ValueFromPipeline = true,
ValueFromPipelineByPropertyName = true,
ParameterSetName = "Default")]
[ValidateNotNullOrEmpty]
public string Name
{
get { return this.name;}
set { this.name = value; }
}
private string name;
/// <summary>
/// The following is the definition of the input parameter "SID".
/// The security group from the local Security Accounts Manager.
/// </summary>
[Parameter(Mandatory = true,
Position = 0,
ValueFromPipeline = true,
ValueFromPipelineByPropertyName = true,
ParameterSetName = "SecurityIdentifier")]
[ValidateNotNullOrEmpty]
public System.Security.Principal.SecurityIdentifier SID
{
get { return this.sid;}
set { this.sid = value; }
}
private System.Security.Principal.SecurityIdentifier sid;
#endregion Parameter Properties
#region Cmdlet Overrides
/// <summary>
/// BeginProcessing method.
/// </summary>
protected override void BeginProcessing()
{
sam = new Sam();
}
/// <summary>
/// ProcessRecord method.
/// </summary>
protected override void ProcessRecord()
{
try
{
IEnumerable<LocalPrincipal> principals = null;
if (Group != null)
principals = ProcessGroup(Group);
else if (Name != null)
principals = ProcessName(Name);
else if (SID != null)
principals = ProcessSid(SID);
if (principals != null)
WriteObject(principals, true);
}
catch (Exception ex)
{
WriteError(ex.MakeErrorRecord());
}
}
/// <summary>
/// EndProcessing method.
/// </summary>
protected override void EndProcessing()
{
if (sam != null)
{
sam.Dispose();
sam = null;
}
}
#endregion Cmdlet Overrides
#region Private Methods
private IEnumerable<LocalPrincipal> ProcessesMembership(IEnumerable<LocalPrincipal> membership)
{
List<LocalPrincipal> rv;
// if no members are specified, return all of them
if (Member == null)
{
// return membership;
rv = new List<LocalPrincipal>(membership);
}
else
{
// var rv = new List<LocalPrincipal>();
rv = new List<LocalPrincipal>();
if (WildcardPattern.ContainsWildcardCharacters(Member))
{
var pattern = new WildcardPattern(Member, WildcardOptions.Compiled
| WildcardOptions.IgnoreCase);
foreach (var m in membership)
if (pattern.IsMatch(sam.StripMachineName(m.Name)))
rv.Add(m);
}
else
{
var sid = this.TrySid(Member);
if (sid != null)
{
foreach (var m in membership)
{
if (m.SID == sid)
{
rv.Add(m);
break;
}
}
}
else
{
foreach (var m in membership)
{
if (sam.StripMachineName(m.Name).Equals(Member, StringComparison.CurrentCultureIgnoreCase))
{
rv.Add(m);
break;
}
}
}
if (rv.Count == 0)
{
var ex = new PrincipalNotFoundException(member, member);
WriteError(ex.MakeErrorRecord());
}
}
}
// sort the resulting principals by mane
rv.Sort(static (p1, p2) => string.Compare(p1.Name, p2.Name, StringComparison.CurrentCultureIgnoreCase));
return rv;
}
private IEnumerable<LocalPrincipal> ProcessGroup(LocalGroup group)
{
return ProcessesMembership(sam.GetLocalGroupMembers(group));
}
private IEnumerable<LocalPrincipal> ProcessName(string name)
{
return ProcessGroup(sam.GetLocalGroup(name));
}
private IEnumerable<LocalPrincipal> ProcessSid(SecurityIdentifier groupSid)
{
return ProcessesMembership(sam.GetLocalGroupMembers(groupSid));
}
#endregion Private Methods
}
}
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