X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/67c7378dcb8de24c86b7fedff90b4b496f2e474c..5a719ac813caa6f2ceaa192274fad2e1c2cec162:/SecureTransport/sslSession.cpp diff --git a/SecureTransport/sslSession.cpp b/SecureTransport/sslSession.cpp new file mode 100644 index 00000000..69be5370 --- /dev/null +++ b/SecureTransport/sslSession.cpp @@ -0,0 +1,266 @@ +/* + * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. + * + * The contents of this file constitute Original Code as defined in and are + * subject to the Apple Public Source License Version 1.2 (the 'License'). + * You may not use this file except in compliance with the License. Please obtain + * a copy of the License at http://www.apple.com/publicsource and read it before + * using this file. + * + * This Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS + * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT + * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR + * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the + * specific language governing rights and limitations under the License. + */ + + +#include "ssl.h" +#include "sslContext.h" +#include "sslSession.h" +#include "sslMemory.h" +#include "sslUtils.h" +#include "sslDebug.h" +#include "cipherSpecs.h" +#include "appleSession.h" + +#include +#include +#include + +typedef struct +{ int sessionIDLen; + UInt8 sessionID[32]; + SSLProtocolVersion protocolVersion; + UInt16 cipherSuite; + UInt16 padding; /* so remainder is word aligned */ + UInt8 masterSecret[48]; + int certCount; + UInt8 certs[1]; /* Actually, variable length */ +} ResumableSession; + +/* + * Cook up a (private) resumable session blob, based on the + * specified ctx, store it with ctx->peerID as the key. + * NOTE: This is contrary to the SSL v3 spec, which claims that + * servers store resumable sessions using ctx->sessionID as the key. + * I don' think this is an issue...is it? + */ +OSStatus +SSLAddSessionData(const SSLContext *ctx) +{ OSStatus err; + uint32 sessionIDLen; + SSLBuffer sessionID; + ResumableSession *session; + int certCount; + SSLCertificate *cert; + uint8 *certDest; + + /* If we don't know who the peer is, we can't store a session */ + if (ctx->peerID.data == 0) + return errSSLSessionNotFound; + + sessionIDLen = offsetof(ResumableSession, certs); + cert = ctx->peerCert; + certCount = 0; + while (cert) + { ++certCount; + sessionIDLen += 4 + cert->derCert.length; + cert = cert->next; + } + + if ((err = SSLAllocBuffer(sessionID, sessionIDLen, ctx)) != 0) + return err; + + session = (ResumableSession*)sessionID.data; + + session->sessionIDLen = ctx->sessionID.length; + memcpy(session->sessionID, ctx->sessionID.data, session->sessionIDLen); + session->protocolVersion = ctx->negProtocolVersion; + session->cipherSuite = ctx->selectedCipher; + memcpy(session->masterSecret, ctx->masterSecret, 48); + session->certCount = certCount; + session->padding = 0; + + certDest = session->certs; + cert = ctx->peerCert; + while (cert) + { certDest = SSLEncodeInt(certDest, cert->derCert.length, 4); + memcpy(certDest, cert->derCert.data, cert->derCert.length); + certDest += cert->derCert.length; + cert = cert->next; + } + + err = sslAddSession(ctx->peerID, sessionID); + SSLFreeBuffer(sessionID, ctx); + + return err; +} + +/* + * Retrieve resumable session data, from key ctx->peerID. + */ +OSStatus +SSLGetSessionData(SSLBuffer *sessionData, const SSLContext *ctx) +{ OSStatus err; + + if (ctx->peerID.data == 0) + return errSSLSessionNotFound; + + sessionData->data = 0; + + err = sslGetSession(ctx->peerID, sessionData); + if (sessionData->data == 0) + return errSSLSessionNotFound; + + return err; +} + +OSStatus +SSLDeleteSessionData(const SSLContext *ctx) +{ OSStatus err; + + if (ctx->peerID.data == 0) + return errSSLSessionNotFound; + + err = sslDeleteSession(ctx->peerID); + return err; +} + +/* + * Given a sessionData blob, obtain the associated sessionID (NOT the key...). + */ +OSStatus +SSLRetrieveSessionID( + const SSLBuffer sessionData, + SSLBuffer *identifier, + const SSLContext *ctx) +{ OSStatus err; + ResumableSession *session; + + session = (ResumableSession*) sessionData.data; + if ((err = SSLAllocBuffer(*identifier, session->sessionIDLen, ctx)) != 0) + return err; + memcpy(identifier->data, session->sessionID, session->sessionIDLen); + return noErr; +} + +/* + * Obtain the protocol version associated with a specified resumable session blob. + */ +OSStatus +SSLRetrieveSessionProtocolVersion( + const SSLBuffer sessionData, + SSLProtocolVersion *version, + const SSLContext *ctx) +{ ResumableSession *session; + + session = (ResumableSession*) sessionData.data; + *version = session->protocolVersion; + return noErr; +} + +/* + * Retrieve session state from specified sessionData blob, install into + * ctx. Presumably, ctx->sessionID and + * ctx->negProtocolVersion are already init'd (from the above two functions). + */ + +/* + * Netscape Enterprise Server is known to change cipherspecs upon session resumption. + * For example, connecting to cdnow.com with all ciphersuites enabled results in + * CipherSuite 4 (SSL_RSA_WITH_RC4_128_MD5) being selected on the first session, + * and CipherSuite 10 (SSL_RSA_WITH_3DES_EDE_CBC_SHA) being selected on subsequent + * sessions. This is contrary to the SSL3.0 spec, sesion 7.6.1.3, describing the + * Server Hello message. + * + * This anomaly does not occur if only RC4 ciphers are enabled in the Client Hello + * message. It also does not happen in SSL V2. + */ +#define ALLOW_CIPHERSPEC_CHANGE 1 + +OSStatus +SSLInstallSessionFromData(const SSLBuffer sessionData, SSLContext *ctx) +{ OSStatus err; + ResumableSession *session; + uint8 *storedCertProgress; + SSLCertificate *cert, *lastCert; + int certCount; + uint32 certLen; + + session = (ResumableSession*)sessionData.data; + + assert(ctx->negProtocolVersion == session->protocolVersion); + + /* + * For SSLv3 and TLSv1, we know that selectedCipher has already been specified in + * SSLProcessServerHello(). An SSLv2 server hello message with a session + * ID hit contains no CipherKind field so we set it here. + */ + if(ctx->negProtocolVersion == SSL_Version_2_0) { + if(ctx->protocolSide == SSL_ClientSide) { + assert(ctx->selectedCipher == 0); + ctx->selectedCipher = session->cipherSuite; + } + else { + /* + * Else...what if they don't match? Could never happen, right? + * Wouldn't that mean the client is trying to switch ciphers on us? + */ + if(ctx->selectedCipher != session->cipherSuite) { + sslErrorLog("+++SSL2: CipherSpec change from %d to %d on session " + "resume\n", + session->cipherSuite, ctx->selectedCipher); + return errSSLProtocol; + } + } + } + else { + assert(ctx->selectedCipher != 0); + if(ctx->selectedCipher != session->cipherSuite) { + #if ALLOW_CIPHERSPEC_CHANGE + sslErrorLog("+++WARNING: CipherSpec change from %d to %d " + "on session resume\n", + session->cipherSuite, ctx->selectedCipher); + #else + sslErrorLog("+++SSL: CipherSpec change from %d to %d on session resume\n", + session->cipherSuite, ctx->selectedCipher); + return errSSLProtocol; + #endif + } + } + if ((err = FindCipherSpec(ctx)) != 0) { + return err; + } + memcpy(ctx->masterSecret, session->masterSecret, 48); + + lastCert = 0; + storedCertProgress = session->certs; + certCount = session->certCount; + + while (certCount--) + { + cert = (SSLCertificate *)sslMalloc(sizeof(SSLCertificate)); + if(cert == NULL) { + return memFullErr; + } + cert->next = 0; + certLen = SSLDecodeInt(storedCertProgress, 4); + storedCertProgress += 4; + if ((err = SSLAllocBuffer(cert->derCert, certLen, ctx)) != 0) + { + sslFree(cert); + return err; + } + memcpy(cert->derCert.data, storedCertProgress, certLen); + storedCertProgress += certLen; + if (lastCert == 0) + ctx->peerCert = cert; + else + lastCert->next = cert; + lastCert = cert; + } + + return noErr; +}