/*
* Copyright (c) 2010, 2011, Jonathan Schleifer <js@webkeks.org>
* Copyright (c) 2011, Florian Zeitz <florob@babelmonkeys.de>
*
* https://webkeks.org/hg/objxmpp/
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <stringprep.h>
#include <idna.h>
#import <ObjGnuTLS/ObjGnuTLS.h>
#import "XMPPConnection.h"
#import "XMPPSCRAMAuth.h"
#import "XMPPPLAINAuth.h"
#import "XMPPStanza.h"
#import "XMPPJID.h"
#import "XMPPIQ.h"
#import "XMPPMessage.h"
#import "XMPPPresence.h"
#import "XMPPExceptions.h"
#define NS_BIND @"urn:ietf:params:xml:ns:xmpp-bind"
#define NS_CLIENT @"jabber:client"
#define NS_SASL @"urn:ietf:params:xml:ns:xmpp-sasl"
#define NS_STARTTLS @"urn:ietf:params:xml:ns:xmpp-tls"
#define NS_SESSION @"urn:ietf:params:xml:ns:xmpp-session"
#define NS_STREAM @"http://etherx.jabber.org/streams"
@interface XMPPConnection ()
- (void)XMPP_startStream;
- (void)XMPP_sendAuth: (OFString*)name;
- (void)XMPP_sendResourceBind;
- (void)XMPP_sendSession;
- (void)XMPP_handleResourceBind: (XMPPIQ*)iq;
- (void)XMPP_handleSession;
- (void)XMPP_handleFeatures: (OFXMLElement*)elem;
- (void)XMPP_handleIQ: (XMPPIQ*)iq;
- (void)XMPP_handleMessage: (XMPPMessage*)msg;
- (void)XMPP_handlePresence: (XMPPPresence*)pres;
@end
@implementation XMPPConnection
@synthesize JID, port, useTLS, delegate;
- init
{
self = [super init];
sock = [[OFTCPSocket alloc] init];
parser = [[OFXMLParser alloc] init];
elementBuilder = [[OFXMLElementBuilder alloc] init];
port = 5222;
useTLS = YES;
parser.delegate = self;
elementBuilder.delegate = self;
return self;
}
- (void)dealloc
{
[sock release];
[parser release];
[elementBuilder release];
[authModule release];
[super dealloc];
}
- (void)setUsername: (OFString*)username_
{
OFString *old = username;
char *node;
Stringprep_rc rc;
if ((rc = stringprep_profile([username_ cString], &node,
"SASLprep", 0)) != STRINGPREP_OK)
@throw [XMPPStringPrepFailedException newWithClass: isa
connection: self
profile: @"SASLprep"
string: username_];
@try {
username = [[OFString alloc] initWithCString: node];
} @finally {
free(node);
}
[old release];
}
- (OFString*)username
{
return [[username copy] autorelease];
}
- (void)setResource: (OFString*)resource_
{
OFString *old = resource;
char *res;
Stringprep_rc rc;
if ((rc = stringprep_profile([resource_ cString], &res,
"Resourceprep", 0)) != STRINGPREP_OK)
@throw [XMPPStringPrepFailedException
newWithClass: isa
connection: self
profile: @"Resourceprep"
string: resource_];
@try {
resource = [[OFString alloc] initWithCString: res];
} @finally {
free(res);
}
[old release];
}
- (OFString*)resource
{
return [[resource copy] autorelease];
}
- (void)setServer: (OFString*)server_
{
OFString *old = server;
char *srv;
Idna_rc rc;
if ((rc = idna_to_ascii_8z([server_ cString],
&srv, IDNA_USE_STD3_ASCII_RULES)) != IDNA_SUCCESS)
@throw [XMPPIDNATranslationFailedException
newWithClass: isa
connection: self
operation: @"ToASCII"
string: server_];
@try {
server = [[OFString alloc] initWithCString: srv];
} @finally {
free(srv);
}
[old release];
}
- (OFString*)server
{
return [[server copy] autorelease];
}
- (void)setPassword: (OFString*)password_
{
OFString *old = password;
char *pass;
Stringprep_rc rc;
if ((rc = stringprep_profile([password_ cString], &pass,
"SASLprep", 0)) != STRINGPREP_OK)
@throw [XMPPStringPrepFailedException newWithClass: isa
connection: self
profile: @"SASLprep"
string: password_];
@try {
password = [[OFString alloc] initWithCString: pass];
} @finally {
free(pass);
}
[old release];
}
- (OFString*)password
{
return [[password copy] autorelease];
}
- (void)connect
{
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
[sock connectToHost: server
onPort: port];
[self XMPP_startStream];
[pool release];
}
- (void)handleConnection
{
char buf[512];
for (;;) {
size_t len = [sock readNBytes: 512
intoBuffer: buf];
if (len < 1 && [delegate respondsToSelector:
@selector(connectionWasClosed:)])
[delegate connectionWasClosed: self];
[parser parseBuffer: buf
withSize: len];
}
}
- (void)sendStanza: (OFXMLElement*)elem
{
of_log(@"Out: %@", elem);
[sock writeString: [elem stringValue]];
}
- (void)parser: (OFXMLParser*)p
didStartElement: (OFString*)name
withPrefix: (OFString*)prefix
namespace: (OFString*)ns
attributes: (OFArray*)attrs
{
if (![name isEqual: @"stream"] || ![prefix isEqual: @"stream"] ||
![ns isEqual: NS_STREAM]) {
of_log(@"Did not get expected stream start!");
assert(0);
}
for (OFXMLAttribute *attr in attrs) {
if ([attr.name isEqual: @"from"] &&
![attr.stringValue isEqual: server]) {
of_log(@"Got invalid from in stream start!");
assert(0);
}
}
parser.delegate = elementBuilder;
}
- (void)elementBuilder: (OFXMLElementBuilder*)b
didBuildElement: (OFXMLElement*)elem
{
elem.defaultNamespace = NS_CLIENT;
[elem setPrefix: @"stream"
forNamespace: NS_STREAM];
of_log(@"In: %@", elem);
if ([elem.namespace isEqual: NS_CLIENT]) {
if ([elem.name isEqual: @"iq"]) {
[self XMPP_handleIQ: [XMPPIQ stanzaWithElement: elem]];
return;
}
if ([elem.name isEqual: @"message"]) {
[self XMPP_handleMessage:
[XMPPMessage stanzaWithElement: elem]];
return;
}
if ([elem.name isEqual: @"presence"]) {
[self XMPP_handlePresence:
[XMPPPresence stanzaWithElement: elem]];
return;
}
assert(0);
}
if ([elem.namespace isEqual: NS_STREAM]) {
if ([elem.name isEqual: @"features"]) {
[self XMPP_handleFeatures: elem];
return;
}
assert(0);
}
if ([elem.namespace isEqual: NS_STARTTLS]) {
if ([elem.name isEqual: @"proceed"]) {
/* FIXME: Catch errors here */
sock = [[GTLSSocket alloc] initWithSocket: sock];
/* Stream restart */
parser.delegate = self;
[self XMPP_startStream];
return;
}
if ([elem.name isEqual: @"failure"])
/* TODO: Find/create an exception to throw here */
@throw [OFException newWithClass: isa];
assert(0);
}
if ([elem.namespace isEqual: NS_SASL]) {
if ([elem.name isEqual: @"challenge"]) {
OFXMLElement *responseTag;
OFDataArray *challenge =
[OFDataArray dataArrayWithBase64EncodedString:
[elem.children.firstObject stringValue]];
OFDataArray *response =
[authModule
calculateResponseWithChallenge: challenge];
responseTag = [OFXMLElement elementWithName: @"response"
namespace: NS_SASL];
[responseTag
addChild: [OFXMLElement elementWithCharacters:
[response stringByBase64Encoding]]];
[self sendStanza: responseTag];
return;
}
if ([elem.name isEqual: @"success"]) {
[authModule parseServerFinalMessage:
[OFDataArray dataArrayWithBase64EncodedString:
[elem.children.firstObject stringValue]]];
if ([delegate respondsToSelector:
@selector(connectionWasAuthenticated:)])
[delegate connectionWasAuthenticated: self];
/* Stream restart */
parser.delegate = self;
[self XMPP_startStream];
return;
}
if ([elem.name isEqual: @"failure"]) {
of_log(@"Auth failed!");
// FIXME: Do more parsing/handling
@throw [XMPPAuthFailedException
newWithClass: isa
connection: self
reason: [elem stringValue]];
}
assert(0);
}
assert(0);
}
- (void)elementBuilder: (OFXMLElementBuilder*)b
didNotExpectCloseTag: (OFString*)name
withPrefix: (OFString*)prefix
namespace: (OFString*)ns
{
// TODO
}
- (void)XMPP_startStream
{
[sock writeFormat: @"<?xml version='1.0'?>\n"
@"<stream:stream to='%@' xmlns='" NS_CLIENT @"' "
@"xmlns:stream='" NS_STREAM @"' "
@"version='1.0'>", server];
}
- (void)XMPP_handleIQ: (XMPPIQ*)iq
{
// FIXME: More checking!
if ([iq.ID isEqual: @"bind0"] && [iq.type isEqual: @"result"]) {
[self XMPP_handleResourceBind: iq];
return;
}
if ([iq.ID isEqual: @"session0"] && [iq.type isEqual: @"result"]) {
[self XMPP_handleSession];
return;
}
if ([delegate respondsToSelector: @selector(connection:didReceiveIQ:)])
[delegate connection: self
didReceiveIQ: iq];
}
- (void)XMPP_handleMessage: (XMPPMessage*)msg
{
if ([delegate respondsToSelector:
@selector(connection:didReceiveMessage:)])
[delegate connection: self
didReceiveMessage: msg];
}
- (void)XMPP_handlePresence: (XMPPPresence*)pres
{
if ([delegate respondsToSelector:
@selector(connection:didReceivePresence:)])
[delegate connection: self
didReceivePresence: pres];
}
- (void)XMPP_handleFeatures: (OFXMLElement*)elem
{
OFXMLElement *starttls =
[elem elementsForName: @"starttls"
namespace: NS_STARTTLS].firstObject;
OFXMLElement *bind = [elem elementsForName: @"bind"
namespace: NS_BIND].firstObject;
OFXMLElement *session = [elem elementsForName: @"session"
namespace: NS_SESSION].firstObject;
OFArray *mechs = [elem elementsForName: @"mechanisms"
namespace: NS_SASL];
OFMutableArray *mechanisms = [OFMutableArray array];
if (starttls != nil) {
[self sendStanza: [OFXMLElement elementWithName: @"starttls"
namespace: NS_STARTTLS]];
return;
}
if ([mechs count] > 0) {
for (OFXMLElement *mech in [mechs.firstObject children])
[mechanisms addObject:
[mech.children.firstObject stringValue]];
if ([mechanisms containsObject: @"SCRAM-SHA-1"]) {
authModule = [[XMPPSCRAMAuth alloc]
initWithAuthcid: username
password: password
hash: [OFSHA1Hash class]];
[self XMPP_sendAuth: @"SCRAM-SHA-1"];
return;
}
if ([mechanisms containsObject: @"PLAIN"]) {
authModule = [[XMPPPLAINAuth alloc]
initWithAuthcid: username
password: password];
[self XMPP_sendAuth: @"PLAIN"];
return;
}
assert(0);
}
if (session != nil)
needsSession = YES;
if (bind != nil) {
[self XMPP_sendResourceBind];
return;
}
assert(0);
}
- (void)XMPP_sendAuth: (OFString*)name
{
OFXMLElement *authTag;
authTag = [OFXMLElement elementWithName: @"auth"
namespace: NS_SASL];
[authTag addAttributeWithName: @"mechanism"
stringValue: name];
[authTag addChild: [OFXMLElement elementWithCharacters:
[[authModule clientFirstMessage] stringByBase64Encoding]]];
[self sendStanza: authTag];
}
- (void)XMPP_sendResourceBind
{
XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
ID: @"bind0"];
OFXMLElement *bind = [OFXMLElement elementWithName: @"bind"
namespace: NS_BIND];
if (resource)
[bind addChild: [OFXMLElement elementWithName: @"resource"
stringValue: resource]];
[iq addChild: bind];
[self sendStanza: iq];
}
- (void)XMPP_handleResourceBind: (XMPPIQ*)iq
{
OFXMLElement *bindElem = iq.children.firstObject;
OFXMLElement *jidElem;
if (![bindElem.name isEqual: @"bind"] ||
![bindElem.namespace isEqual: NS_BIND])
assert(0);
jidElem = bindElem.children.firstObject;
JID = [[XMPPJID alloc] initWithString:
[jidElem.children.firstObject stringValue]];
if (needsSession) {
[self XMPP_sendSession];
return;
}
if ([delegate respondsToSelector: @selector(connection:wasBoundToJID:)])
[delegate connection: self
wasBoundToJID: JID];
}
- (void)XMPP_sendSession
{
XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
ID: @"session0"];
[iq addChild: [OFXMLElement elementWithName: @"session"
namespace: NS_SESSION]];
[self sendStanza: iq];
}
- (void)XMPP_handleSession
{
if ([delegate respondsToSelector: @selector(connection:wasBoundToJID:)])
[delegate connection: self
wasBoundToJID: JID];
}
@end