C

NTLM Client and Server Code

See more NTLM Examples

Demonstrates the NTLM authentication algorithm for both client and server. C

#include <C_CkNtlm.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkNtlm ntlmClient;
    HCkNtlm ntlmServer;
    const char *type1Msg;
    const char *type1Info;
    const char *type2Msg;
    const char *type2Info;
    const char *type3Msg;
    const char *clientUsername;
    const char *expectedType3Msg;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ntlmClient = CkNtlm_Create();
    ntlmServer = CkNtlm_Create();

    // The NTLM protocol begins by the client sending the server
    // a Type1 message. 

    CkNtlm_putWorkstation(ntlmClient,"MyWorkstation");
    type1Msg = CkNtlm_genType1(ntlmClient);

    printf("Type1 message from client to server:\n");
    printf("%s\n",type1Msg);

    // If the server wishes to examine the information embedded within the
    // Type1 message, it may call ParseType1. 
    // This step is not necessary, it is only for informational purposes..
    type1Info = CkNtlm_parseType1(ntlmServer,type1Msg);

    printf("---\n");
    printf("%s\n",type1Info);

    // The server now generates a Type2 message to be sent to the client.
    // The Type2 message requires a TargetName.  A TargetName is
    // the authentication realm in which the authenticating account
    // has membership (a domain name for domain accounts, or server name
    // for local machine accounts).
    CkNtlm_putTargetName(ntlmServer,"myAuthRealm");

    type2Msg = CkNtlm_genType2(ntlmServer,type1Msg);
    if (CkNtlm_getLastMethodSuccess(ntlmServer) != TRUE) {
        printf("%s\n",CkNtlm_lastErrorText(ntlmServer));
        CkNtlm_Dispose(ntlmClient);
        CkNtlm_Dispose(ntlmServer);
        return;
    }

    printf("Type2 message from server to client:\n");
    printf("%s\n",type2Msg);

    // The client may examine the information embedded in the Type2 message 
    // by calling ParseType2, which returns XML.  This is only for informational purposes
    // and is not required.
    type2Info = CkNtlm_parseType2(ntlmClient,type2Msg);

    printf("---\n");
    printf("%s\n",type2Info);

    // The client will now generate the final Type3 message to be sent to the server.
    // This requires the Username and Password:
    CkNtlm_putUserName(ntlmClient,"test123");
    CkNtlm_putPassword(ntlmClient,"myPassword");

    type3Msg = CkNtlm_genType3(ntlmClient,type2Msg);
    if (CkNtlm_getLastMethodSuccess(ntlmClient) != TRUE) {
        printf("%s\n",CkNtlm_lastErrorText(ntlmClient));
        CkNtlm_Dispose(ntlmClient);
        CkNtlm_Dispose(ntlmServer);
        return;
    }

    printf("Type3 message from client to server:\n");
    printf("%s\n",type3Msg);

    // The server may verify the response by first "loading" the Type3 message.
    // This sets the various properties such as Username, Domain, Workstation,
    // and ClientChallenge to the values embedded within theType3 message.
    // The server may then use the Username to lookup the password.  
    // Looking up the password is dependent on your infrastructure.  Perhaps your
    // usernames/passwords are stored in a secure database.  If that's the case, you would
    // write code to issue a query to get the password string for the given username.
    // Once the password is obtained, set the Password property and then 
    // generate the Type3 response again.  If the server's Type3 response matches
    // the client's Type3 response, then the client's password is correct.

    success = CkNtlm_LoadType3(ntlmServer,type3Msg);
    if (success != TRUE) {
        printf("%s\n",CkNtlm_lastErrorText(ntlmServer));
        CkNtlm_Dispose(ntlmClient);
        CkNtlm_Dispose(ntlmServer);
        return;
    }

    // The Username property now contains the username that was embedded within
    // the Type3 message.  It can be used to lookup the password.
    clientUsername = CkNtlm_userName(ntlmServer);

    // For this example, we'll simply set the password to a literal string:
    CkNtlm_putPassword(ntlmServer,"myPassword");

    // The server may generate the Type3 message again, using the client's correct
    // password:
    expectedType3Msg = CkNtlm_genType3(ntlmServer,type2Msg);

    printf("Expected Type3 Message:\n");
    printf("%s\n",expectedType3Msg);

    // If the Type3 message received from the client is exactly the same as the
    // expected Type3 message, then the client must've used the same password,
    // and authentication is successful


    CkNtlm_Dispose(ntlmClient);
    CkNtlm_Dispose(ntlmServer);

    }