Objective-C

SSL Server Example

See more Socket/SSL/TLS Examples

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit. Objective-C

#import <CkoSocket.h>
#import <CkoCertStore.h>
#import <CkoJsonObject.h>
#import <CkoCert.h>
#import <NSString.h>

BOOL success = NO;

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

CkoSocket *listenSslSocket = [[CkoSocket alloc] init];

//  An SSL server needs a digital certificate.  This example loads it from a PFX file.

//  Create an instance of a certificate store object, load a PFX file,
//  locate the certificate we need, and use it.
//  (a PFX file may contain more than one certificate.)
CkoCertStore *certStore = [[CkoCertStore alloc] init];
//  The 1st argument is the filename, the 2nd arg is the 
//  PFX file's password:
success = [certStore LoadPfxFile: @"chilkat.pfx" password: @"test"];
if (success == NO) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

//  Find the certificate to be used for SSL:
CkoJsonObject *jsonCN = [[CkoJsonObject alloc] init];
[jsonCN UpdateString: @"CN" value: @"example.com"];

CkoCert *cert = [[CkoCert alloc] init];
success = [certStore FindCert: jsonCN cert: cert];
if (success == NO) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

//  Use the certificate:
success = [listenSslSocket InitSslServer: cert];
if (success == NO) {
    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

//  Bind and listen on a port:
int myPort = 8123;
//  Allow for a max of 5 queued connect requests.
int backLog = 5;
success = [listenSslSocket BindAndListen: [NSNumber numberWithInt: myPort] backlog: [NSNumber numberWithInt: backLog]];
if (success == NO) {
    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

//  If accepting an SSL/TLS connection, the SSL handshake is part of the connection
//  establishment process. This involves a few back-and-forth messages between the 
//  client and server to establish algorithms and a shared key to create the secure 
//  channel. The sending and receiving of these messages are governed by the 
//  MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
//  (and this is the default unless changed by your application), then the 
//  AcceptNext can hang indefinitely during the SSL handshake process. 
//  Make sure these properties are set to appropriate values before calling AcceptNext.

//  Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.MaxReadIdleMs = [NSNumber numberWithInt:10000];
listenSslSocket.MaxSendIdleMs = [NSNumber numberWithInt:10000];

//  Accept a single client connection and establish the secure SSL/TLS channel:
int maxWaitMillisec = 20000;
CkoSocket *clientSock = [[CkoSocket alloc] init];
success = [listenSslSocket AcceptNext: [NSNumber numberWithInt: maxWaitMillisec] socket: clientSock];
if (success == NO) {
    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

//  The client (in this example) is going to send a "Hello Server! -EOM-" 
//  message.  Read it:
NSString *receivedMsg = [clientSock ReceiveUntilMatch: @"-EOM-"];
if (clientSock.LastMethodSuccess == NO) {
    NSLog(@"%@",clientSock.LastErrorText);
    return;
}

NSLog(@"%@",receivedMsg);

//  Send a "Hello Client! -EOM-" message:
success = [clientSock SendString: @"Hello Client! -EOM-"];
if (success == NO) {
    NSLog(@"%@",clientSock.LastErrorText);
    return;
}

//  Close the connection with the client
//  Wait a max of 20 seconds (20000 millsec)
success = [clientSock Close: [NSNumber numberWithInt: 20000]];