Create and Manage Telnet users

Windows Embedded CE is provided with a Telnet server, that you can use on your target to access it from the network. This Telnet service can work in two different modes :

1. without authentication : anybody connecting to the Telnet have access to the target
2. with authentication enable : only trusted user with password have access to the target

Enable Telnet Server :
In your OSDesign, select the Telnet Server component located in :
Core OS -> CEBASE -> Communication Services and Networking -> Servers -> Telnet Server

Disable authentication :
Simply add the following lines to your project.reg to disable service authentication. All users then will have access to the service as no credential will be requested.

[HKEY_LOCAL_MACHINE\COMM\TELNETD]
 "IsEnabled"=dword:1
 "UseAuthentication"=dword:0

Enable authentication :
When enabling authentication, you have to add in addition to the Telnet server support, the NTLM component located in :
Core OS -> CEBASE -> Security -> Authentication Services (SSPI) -> NTLM
And you also have to add in registry the list of users that will have access to the service. Users can be classified by groups of users (check MSDN for details).

[HKEY_LOCAL_MACHINE\COMM\TELNETD]
 "IsEnabled"=dword:1
 "UseAuthentication"=dword:1
 "UserList"="Bob"

In the sample above, we are adding user named Bob, and only this user will have access to the telnet service.

Set and Change user password :
By default there is no default password for the different users defined on the system, and the password is ciphered and stored in the registry. This password cannot be set at Runtime image build time, and is usually set on first system boot. The sample code below set the password for user Bob.

#include "ntlmssp.h"

#define DEFAULT_USER        L"Bob"
#define DEFAULT_NEW_PASS    L"password"
...
 BOOL bRet = NTLMSetUserInfo(DEFAULT_USER, DEFAULT_NEW_PASS);

 if (bRet == FALSE)
     RETAILMSG(1, (L"Failed to set user info"));
 else
     RETAILMSG(1, (L"User info updated"));
...

- Nicolas