A little cleanup work. Still needs a configure script.
This commit is contained in:
parent
ba13fa3e3a
commit
c44fefa67c
5 changed files with 318 additions and 249 deletions
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2011, Florian Zeitz <florob@babelmonkeys.de>
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* Copyright (c) 2011, Jonathan Schleifer <js@webkeks.org>
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*
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* https://webkeks.org/hg/objxmpp/
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*
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@ -21,10 +22,6 @@
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*/
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#include <string.h>
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#include <bsd/stdlib.h>
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// FIXME: Remove this once libbsd includes arc4random_uniform() in it's headers
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#define fake_arc4random_uniform(upper) \
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((uint32_t) (arc4random() / (double) UINT32_MAX * upper))
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#import "XMPPSCRAMAuth.h"
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#import "XMPPExceptions.h"
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@ -32,8 +29,11 @@
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#define HMAC_IPAD 0x36
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#define HMAC_OPAD 0x5c
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@implementation XMPPSCRAMAuth
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#ifndef HAVE_ARC4RANDOM_UNIFORM
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extern uint32_t arc4random_uniform(uint32_t);
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#endif
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@implementation XMPPSCRAMAuth
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+ SCRAMAuthWithAuthcid: (OFString*)authcid
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password: (OFString*)password
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hash: (Class)hash;
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@ -93,14 +93,12 @@
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OFString *old = authzid;
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if (authzid_) {
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OFMutableString *new = [[OFMutableString alloc]
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initWithString: authzid_];
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OFMutableString *new = [[authzid_ mutableCopy] autorelease];
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[new replaceOccurrencesOfString: @"="
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withString: @"=3D"];
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[new replaceOccurrencesOfString: @","
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withString: @"=2C"];
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authzid = [new copy];
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[new release];
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authzid = [new retain];
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} else
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authzid = nil;
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@ -112,54 +110,51 @@
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OFString *old = authcid;
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if (authcid_) {
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OFMutableString *new = [[OFMutableString alloc]
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initWithString: authcid_];
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OFMutableString *new = [[authcid_ mutableCopy] autorelease];
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[new replaceOccurrencesOfString: @"="
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withString: @"=3D"];
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[new replaceOccurrencesOfString: @","
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withString: @"=2C"];
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authcid = [new copy];
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[new release];
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authcid = [new retain];
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} else
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authcid = nil;
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[old release];
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}
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- (OFString *)_genNonce
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- (OFString*)_genNonce
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{
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OFMutableString *nonce = [OFMutableString string];
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uint32_t res, i;
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for (i = 0; i < 64; i++) {
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while((res = fake_arc4random_uniform(0x5e) + 0x21) == 0x2C);
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while ((res = arc4random_uniform('~' - '!' + 1) + '!') == ',');
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[nonce appendFormat: @"%c", res];
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}
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return nonce;
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}
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- (uint8_t *)_hmacWithKey: (OFDataArray*)key
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data: (OFDataArray*)data
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- (uint8_t*)_HMACWithKey: (OFDataArray*)key
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data: (OFDataArray*)data
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{
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OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
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OFDataArray *k = [OFDataArray dataArrayWithItemSize: 1];
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size_t i, kSize, blockSize = [hashType blockSize];
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uint8_t *kCArray = NULL, *kI = NULL, *kO = NULL;
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OFAutoreleasePool *pool = nil;
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OFDataArray *k = nil;
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OFHash *hash = nil;
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uint8_t *kCArray, *kI = NULL, *kO = NULL;
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OFHash *hash;
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if (key.itemSize * key.count > blockSize) {
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hash = [[[hashType alloc] init] autorelease];
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[hash updateWithBuffer: [key cArray]
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ofSize: key.itemSize * key.count];
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[k addNItems: [hashType digestSize]
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fromCArray: [hash digest]];
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} else
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[k addNItems: key.itemSize * key.count
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fromCArray: [key cArray]];
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@try {
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pool = [[OFAutoreleasePool alloc] init];
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k = [OFDataArray dataArrayWithItemSize: 1];
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if (key.itemSize * key.count > blockSize) {
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hash = [[[hashType alloc] init] autorelease];
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[hash updateWithBuffer: [key cArray]
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ofSize: key.itemSize * key.count];
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[k addNItems: [hashType digestSize]
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fromCArray: [hash digest]];
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} else
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[k addNItems: key.itemSize * key.count
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fromCArray: [key cArray]];
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kI = [self allocMemoryWithSize: blockSize * sizeof(uint8_t)];
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memset(kI, HMAC_IPAD, blockSize * sizeof(uint8_t));
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@ -177,7 +172,7 @@
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[k addNItems: blockSize
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fromCArray: kI];
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[k addNItems: data.itemSize * data.count
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fromCArray: [data cArray]];
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fromCArray: [data cArray]];
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hash = [[[hashType alloc] init] autorelease];
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[hash updateWithBuffer: [k cArray]
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@ -187,89 +182,94 @@
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fromCArray: kO];
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[k addNItems: [hashType digestSize]
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fromCArray: [hash digest]];
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hash = [[[hashType alloc] init] autorelease];
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[hash updateWithBuffer: [k cArray]
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ofSize: k.count];
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[hash retain];
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[pool release];
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pool = nil;
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[hash autorelease];
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return [hash digest];
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} @finally {
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[pool release];
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[self freeMemory: kI];
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[self freeMemory: kO];
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}
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hash = [[[hashType alloc] init] autorelease];
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[hash updateWithBuffer: [k cArray]
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ofSize: k.count];
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[hash retain];
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[pool release];
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return [hash digest];
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}
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- (OFDataArray *)_hiWithData: (OFDataArray *)str
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salt: (OFDataArray *)salt_
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iterationCount: (unsigned int)i
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- (OFDataArray*)_hiWithData: (OFDataArray *)str
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salt: (OFDataArray *)salt_
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iterationCount: (unsigned int)i
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{
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OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
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size_t digestSize = [hashType digestSize];
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uint8_t *result = NULL, *u, *uOld;
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unsigned int j, k;
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size_t digestSize;
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OFAutoreleasePool *pool = nil;
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OFDataArray *salty, *tmp, *ret;
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result = [self allocMemoryWithSize: digestSize];
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@try {
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pool = [[OFAutoreleasePool alloc] init];
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digestSize = [hashType digestSize];
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result = [self
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allocMemoryWithSize: digestSize * sizeof(uint8_t)];
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memset(result, 0, digestSize * sizeof(uint8_t));
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salty = [salt_ copy];
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memset(result, 0, digestSize);
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salty = [[salt_ copy] autorelease];
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[salty addNItems: 4
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fromCArray: "\0\0\0\1"];
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uOld = [self _hmacWithKey: str
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uOld = [self _HMACWithKey: str
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data: salty];
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[salty release];
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for (j = 0; j < digestSize; j++)
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result[j] ^= uOld[j];
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for (j = 0; j < i-1; j++) {
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for (j = 0; j < i - 1; j++) {
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tmp = [OFDataArray dataArrayWithItemSize: 1];
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[tmp addNItems: digestSize
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fromCArray: uOld];
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u = [self _hmacWithKey: str
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u = [self _HMACWithKey: str
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data: tmp];
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for (k = 0; k < digestSize; k++)
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result[k] ^= u[k];
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uOld = u;
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[pool releaseObjects];
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}
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ret = [OFDataArray dataArrayWithItemSize: 1];
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[ret addNItems: digestSize
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fromCArray: result];
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[ret retain];
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[pool release];
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pool = nil;
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return [ret autorelease];
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} @finally {
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[pool release];
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[self freeMemory: result];
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}
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[ret retain];
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[pool release];
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return [ret autorelease];
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}
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- (OFDataArray*)clientFirstMessage
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{
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OFDataArray *ret = [OFDataArray dataArrayWithItemSize: 1];
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[GS2Header release];
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GS2Header = nil;
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if (authzid)
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GS2Header = [[OFString alloc]
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initWithFormat: @"n,a=%@,", authzid];
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else
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GS2Header = [[OFString alloc] initWithFormat: @"n,,"];
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GS2Header = @"n,,";
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[cNonce release];
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cNonce = nil;
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cNonce = [[self _genNonce] retain];
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[clientFirstMessageBare release];
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clientFirstMessageBare = nil;
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clientFirstMessageBare = [[OFString alloc]
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initWithFormat: @"n=%@,r=%@", authcid, cNonce];
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@ -292,183 +292,171 @@
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OFString *tmpString, *sNonce;
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OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
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@try {
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hash = [[[hashType alloc] init] autorelease];
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ret = [OFDataArray dataArrayWithItemSize: 1];
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authMessage = [OFDataArray dataArrayWithItemSize: 1];
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hash = [[[hashType alloc] init] autorelease];
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ret = [OFDataArray dataArrayWithItemSize: 1];
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authMessage = [OFDataArray dataArrayWithItemSize: 1];
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OFString *chal = [OFString
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stringWithCString: [challenge cArray]
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length:
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[challenge count] * [challenge itemSize]];
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OFString *chal = [OFString stringWithCString: [challenge cArray]
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length: [challenge count] *
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[challenge itemSize]];
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for (OFString *comp
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in [chal componentsSeparatedByString: @","]) {
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OFString *entry = [comp
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substringFromIndex: 2
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toIndex: [comp length]];
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if ([comp hasPrefix: @"r="]) {
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if (![entry hasPrefix: cNonce])
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@throw [XMPPAuthFailedException
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newWithClass: isa
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connection: nil
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reason:
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@"Received wrong nonce"];
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sNonce = entry;
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} else if ([comp hasPrefix: @"s="])
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salt = [OFDataArray
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dataArrayWithBase64EncodedString: entry];
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else if ([comp hasPrefix: @"i="])
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iterCount = [entry decimalValue];
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}
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for (OFString *comp in [chal componentsSeparatedByString: @","]) {
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OFString *entry = [comp substringFromIndex: 2
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toIndex: [comp length]];
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// Add c=<base64(GS2Header+channelBindingData)>
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// XXX: No channel binding for now
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [GS2Header cStringLength]
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fromCArray: [GS2Header cString]];
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tmpString = [tmpArray stringByBase64Encoding];
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[ret addNItems: 2
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fromCArray: "c="];
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[ret addNItems: [tmpString cStringLength]
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fromCArray: [tmpString cString]];
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if ([comp hasPrefix: @"r="]) {
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if (![entry hasPrefix: cNonce])
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@throw [XMPPAuthFailedException
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newWithClass: isa
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connection: nil
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reason: @"Received wrong nonce"];
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// Add r=<nonce>
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[ret addItem: ","];
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[ret addNItems: 2
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fromCArray: "r="];
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[ret addNItems: [sNonce cStringLength]
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fromCArray: [sNonce cString]];
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [password cStringLength]
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fromCArray: [password cString]];
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/*
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* IETF RFC 5802:
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* SaltedPassword := Hi(Normalize(password), salt, i)
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*/
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saltedPassword = [self _hiWithData: tmpArray
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salt: salt
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iterationCount: iterCount];
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/*
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* IETF RFC 5802:
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* AuthMessage := client-first-message-bare + "," +
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* server-first-message + "," +
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* client-final-message-without-proof
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*/
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[authMessage addNItems: [clientFirstMessageBare cStringLength]
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fromCArray: [clientFirstMessageBare cString]];
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[authMessage addItem: ","];
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[authMessage addNItems: [challenge count] * [challenge itemSize]
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fromCArray: [challenge cArray]];
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[authMessage addItem: ","];
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[authMessage addNItems: [ret count]
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fromCArray: [ret cArray]];
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/*
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* IETF RFC 5802:
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* ClientKey := HMAC(SaltedPassword, "Client Key")
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*/
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: 10
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fromCArray: "Client Key"];
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clientKey = [self _hmacWithKey: saltedPassword
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data: tmpArray];
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/*
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* IETF RFC 5802:
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* StoredKey := H(ClientKey)
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*/
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[hash updateWithBuffer: (void*) clientKey
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ofSize: [hashType digestSize]];
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [hashType digestSize]
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fromCArray: [hash digest]];
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/*
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* IETF RFC 5802:
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* ClientSignature := HMAC(StoredKey, AuthMessage)
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*/
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clientSignature = [self _hmacWithKey: tmpArray
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data: authMessage];
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/*
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* IETF RFC 5802:
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* ServerKey := HMAC(SaltedPassword, "Server Key")
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*/
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: 10
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fromCArray: "Server Key"];
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serverKey = [self _hmacWithKey: saltedPassword
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data: tmpArray];
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/*
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* IETF RFC 5802:
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* ServerSignature := HMAC(ServerKey, AuthMessage)
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*/
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [hashType digestSize]
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fromCArray: serverKey];
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serverSignature = [[OFDataArray alloc] initWithItemSize: 1];
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[serverSignature addNItems: [hashType digestSize]
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fromCArray: [self _hmacWithKey: tmpArray
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data: authMessage]];
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/*
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* IETF RFC 5802:
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* ClientProof := ClientKey XOR ClientSignature
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*/
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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for (i = 0; i < [hashType digestSize]; i++) {
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uint8_t c = clientKey[i] ^ clientSignature[i];
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[tmpArray addItem: &c];
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}
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// Add p=<base64(ClientProof)>
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[ret addItem: ","];
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[ret addNItems: 2
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fromCArray: "p="];
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tmpString = [tmpArray stringByBase64Encoding];
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[ret addNItems: [tmpString cStringLength]
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fromCArray: [tmpString cString]];
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[ret retain];
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[pool release];
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pool = nil;
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return [ret autorelease];
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} @finally {
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[pool release];
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sNonce = entry;
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} else if ([comp hasPrefix: @"s="])
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salt = [OFDataArray
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dataArrayWithBase64EncodedString: entry];
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else if ([comp hasPrefix: @"i="])
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iterCount = [entry decimalValue];
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}
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// Add c=<base64(GS2Header+channelBindingData)>
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// XXX: No channel binding for now
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [GS2Header cStringLength]
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fromCArray: [GS2Header cString]];
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tmpString = [tmpArray stringByBase64Encoding];
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[ret addNItems: 2
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fromCArray: "c="];
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[ret addNItems: [tmpString cStringLength]
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fromCArray: [tmpString cString]];
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// Add r=<nonce>
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[ret addItem: ","];
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[ret addNItems: 2
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fromCArray: "r="];
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[ret addNItems: [sNonce cStringLength]
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fromCArray: [sNonce cString]];
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tmpArray = [OFDataArray dataArrayWithItemSize: 1];
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[tmpArray addNItems: [password cStringLength]
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fromCArray: [password cString]];
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/*
|
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* IETF RFC 5802:
|
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* SaltedPassword := Hi(Normalize(password), salt, i)
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*/
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saltedPassword = [self _hiWithData: tmpArray
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salt: salt
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iterationCount: iterCount];
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|
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/*
|
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* IETF RFC 5802:
|
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* AuthMessage := client-first-message-bare + "," +
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* server-first-message + "," +
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* client-final-message-without-proof
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*/
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[authMessage addNItems: [clientFirstMessageBare cStringLength]
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fromCArray: [clientFirstMessageBare cString]];
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[authMessage addItem: ","];
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[authMessage addNItems: [challenge count] * [challenge itemSize]
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fromCArray: [challenge cArray]];
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[authMessage addItem: ","];
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[authMessage addNItems: [ret count]
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fromCArray: [ret cArray]];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* ClientKey := HMAC(SaltedPassword, "Client Key")
|
||||
*/
|
||||
tmpArray = [OFDataArray dataArrayWithItemSize: 1];
|
||||
[tmpArray addNItems: 10
|
||||
fromCArray: "Client Key"];
|
||||
clientKey = [self _HMACWithKey: saltedPassword
|
||||
data: tmpArray];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* StoredKey := H(ClientKey)
|
||||
*/
|
||||
[hash updateWithBuffer: (void*) clientKey
|
||||
ofSize: [hashType digestSize]];
|
||||
tmpArray = [OFDataArray dataArrayWithItemSize: 1];
|
||||
[tmpArray addNItems: [hashType digestSize]
|
||||
fromCArray: [hash digest]];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* ClientSignature := HMAC(StoredKey, AuthMessage)
|
||||
*/
|
||||
clientSignature = [self _HMACWithKey: tmpArray
|
||||
data: authMessage];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* ServerKey := HMAC(SaltedPassword, "Server Key")
|
||||
*/
|
||||
tmpArray = [OFDataArray dataArrayWithItemSize: 1];
|
||||
[tmpArray addNItems: 10
|
||||
fromCArray: "Server Key"];
|
||||
serverKey = [self _HMACWithKey: saltedPassword
|
||||
data: tmpArray];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* ServerSignature := HMAC(ServerKey, AuthMessage)
|
||||
*/
|
||||
tmpArray = [OFDataArray dataArrayWithItemSize: 1];
|
||||
[tmpArray addNItems: [hashType digestSize]
|
||||
fromCArray: serverKey];
|
||||
serverSignature = [[OFDataArray alloc] initWithItemSize: 1];
|
||||
[serverSignature addNItems: [hashType digestSize]
|
||||
fromCArray: [self _HMACWithKey: tmpArray
|
||||
data: authMessage]];
|
||||
|
||||
/*
|
||||
* IETF RFC 5802:
|
||||
* ClientProof := ClientKey XOR ClientSignature
|
||||
*/
|
||||
tmpArray = [OFDataArray dataArrayWithItemSize: 1];
|
||||
for (i = 0; i < [hashType digestSize]; i++) {
|
||||
uint8_t c = clientKey[i] ^ clientSignature[i];
|
||||
[tmpArray addItem: &c];
|
||||
}
|
||||
|
||||
// Add p=<base64(ClientProof)>
|
||||
[ret addItem: ","];
|
||||
[ret addNItems: 2
|
||||
fromCArray: "p="];
|
||||
tmpString = [tmpArray stringByBase64Encoding];
|
||||
[ret addNItems: [tmpString cStringLength]
|
||||
fromCArray: [tmpString cString]];
|
||||
|
||||
[ret retain];
|
||||
[pool release];
|
||||
|
||||
return [ret autorelease];
|
||||
}
|
||||
|
||||
- (void)parseServerFinalMessage: (OFDataArray*)message
|
||||
{
|
||||
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
|
||||
@try {
|
||||
OFString *mess = [OFString
|
||||
stringWithCString: [message cArray]
|
||||
length: [message count] * [message itemSize]];
|
||||
OFString *mess = [OFString stringWithCString: [message cArray]
|
||||
length: [message count] *
|
||||
[message itemSize]];
|
||||
OFString *value = [mess substringFromIndex: 2
|
||||
toIndex: [mess length]];
|
||||
|
||||
OFString *value = [mess substringFromIndex: 2
|
||||
toIndex: [mess length]];
|
||||
if ([mess hasPrefix: @"v="]) {
|
||||
if (![value isEqual: [serverSignature stringByBase64Encoding]])
|
||||
@throw [XMPPAuthFailedException
|
||||
newWithClass: isa
|
||||
connection: nil
|
||||
reason: @"Received wrong ServerSignature"];
|
||||
} else
|
||||
@throw [XMPPAuthFailedException newWithClass: isa
|
||||
connection: nil
|
||||
reason: value];
|
||||
|
||||
if ([mess hasPrefix: @"v="]) {
|
||||
if ([value compare:
|
||||
[serverSignature stringByBase64Encoding]])
|
||||
@throw [XMPPAuthFailedException
|
||||
newWithClass: isa
|
||||
connection: nil
|
||||
reason:
|
||||
@"Received wrong ServerSignature"];
|
||||
} else
|
||||
@throw [XMPPAuthFailedException newWithClass: isa
|
||||
connection: nil
|
||||
reason: value];
|
||||
} @finally {
|
||||
[pool release];
|
||||
}
|
||||
[pool release];
|
||||
}
|
||||
@end
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue