--- /dev/null
+/*
+ * 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 <assert.h>
+#include <string.h>
+#include <stddef.h>
+
+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;
+}
projects / apple / security.git / blobdiff