The Tor Browser: security/manager/ssl/src/nsCMSSecureMessage.cpp@b8a032363ba2 (annotated)

security/manager/ssl/src/nsCMSSecureMessage.cpp@b8a032363ba2 (annotated)

security/manager/ssl/src/nsCMSSecureMessage.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsXPIDLString.h"
 #include "nsCOMPtr.h"
 #include "nsISupports.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsCRT.h"
 #include "nsICMSSecureMessage.h"
 #include "nsCMSSecureMessage.h"
 #include "nsNSSCertificate.h"
 #include "nsNSSHelper.h"
 #include "nsNSSShutDown.h"
 #include <string.h>
 #include "plbase64.h"
 #include "cert.h"
 #include "cms.h"
 #include "nsIServiceManager.h"
 #include "nsIPrefService.h"
 #include "nsIPrefBranch.h"
 #include "prlog.h"
 #ifdef PR_LOGGING
 extern PRLogModuleInfo* gPIPNSSLog;
 #endif
 // Standard ISupports implementation
 // NOTE: Should these be the thread-safe versions?
 /*****
  * nsCMSSecureMessage
  *****/
 // Standard ISupports implementation
 NS_IMPL_ISUPPORTS(nsCMSSecureMessage, nsICMSSecureMessage)
 // nsCMSSecureMessage constructor
 nsCMSSecureMessage::nsCMSSecureMessage()
 {
   // initialize superclass
 }
 // nsCMSMessage destructor
 nsCMSSecureMessage::~nsCMSSecureMessage()
 {
 }
 /* string getCertByPrefID (in string certID); */
 NS_IMETHODIMP nsCMSSecureMessage::
 GetCertByPrefID(const char *certID, char **_retval)
 {
   nsNSSShutDownPreventionLock locker;
   PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::GetCertByPrefID\n"));
   nsresult rv = NS_OK;
   CERTCertificate *cert = 0;
   nsXPIDLCString nickname;
   nsCOMPtr<nsIInterfaceRequestor> ctx = new PipUIContext();
   *_retval = 0;
   nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
   if (NS_FAILED(rv)) {
     goto done;
   }
   rv = prefs->GetCharPref(certID,
                           getter_Copies(nickname));
   if (NS_FAILED(rv)) goto done;
   /* Find a good cert in the user's database */
   cert = CERT_FindUserCertByUsage(CERT_GetDefaultCertDB(), const_cast<char*>(nickname.get()),
            certUsageEmailRecipient, true, ctx);
   if (!cert) {
     /* Success, but no value */
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::GetCertByPrefID - can't find user cert\n"));
     goto done;
   }
   /* Convert the DER to a BASE64 String */
   encode(cert->derCert.data, cert->derCert.len, _retval);
 done:
   if (cert) CERT_DestroyCertificate(cert);
   return rv;
 }
 // nsCMSSecureMessage::DecodeCert
 nsresult nsCMSSecureMessage::
 DecodeCert(const char *value, nsIX509Cert ** _retval)
 {
   nsNSSShutDownPreventionLock locker;
   PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::DecodeCert\n"));
   nsresult rv = NS_OK;
   int32_t length;
   unsigned char *data = 0;
   *_retval = 0;
   if (!value) { return NS_ERROR_FAILURE; }
   rv = decode(value, &data, &length);
   if (NS_FAILED(rv)) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::DecodeCert - can't decode cert\n"));
     return rv;
   }
   nsCOMPtr<nsIX509Cert> cert =  nsNSSCertificate::ConstructFromDER((char *)data, length);
   if (cert) {
     *_retval = cert;
     NS_ADDREF(*_retval);
   }
   else {
     rv = NS_ERROR_FAILURE;
   }
   free((char*)data);
   return rv;
 }
 // nsCMSSecureMessage::SendMessage
 nsresult nsCMSSecureMessage::
 SendMessage(const char *msg, const char *base64Cert, char ** _retval)
 {
   nsNSSShutDownPreventionLock locker;
   PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage\n"));
   nsresult rv = NS_OK;
   CERTCertificate *cert = 0;
   NSSCMSMessage *cmsMsg = 0;
   unsigned char *certDER = 0;
   int32_t derLen;
   NSSCMSEnvelopedData *env;
   NSSCMSContentInfo *cinfo;
   NSSCMSRecipientInfo *rcpt;
   SECItem output;
   PLArenaPool *arena = PORT_NewArena(1024);
   SECStatus s;
   nsCOMPtr<nsIInterfaceRequestor> ctx = new PipUIContext();
   /* Step 0. Create a CMS Message */
   cmsMsg = NSS_CMSMessage_Create(nullptr);
   if (!cmsMsg) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't create NSSCMSMessage\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Step 1.  Import the certificate into NSS */
   rv = decode(base64Cert, &certDER, &derLen);
   if (NS_FAILED(rv)) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't decode / import cert into NSS\n"));
     goto done;
   }
   cert = CERT_DecodeCertFromPackage((char *)certDER, derLen);
   if (!cert) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't decode cert from package\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Step 2.  Get a signature cert */
   /* Step 3. Build inner (signature) content */
   /* Step 4. Build outer (enveloped) content */
   env = NSS_CMSEnvelopedData_Create(cmsMsg, SEC_OID_DES_EDE3_CBC, 0);
   if (!env) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't create envelope data\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   cinfo = NSS_CMSEnvelopedData_GetContentInfo(env);
   s = NSS_CMSContentInfo_SetContent_Data(cmsMsg, cinfo, 0, false);
   if (s != SECSuccess) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't set content data\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   rcpt = NSS_CMSRecipientInfo_Create(cmsMsg, cert);
   if (!rcpt) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't create recipient info\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   s = NSS_CMSEnvelopedData_AddRecipient(env, rcpt);
   if (s != SECSuccess) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't add recipient\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Step 5. Add content to message */
   cinfo = NSS_CMSMessage_GetContentInfo(cmsMsg);
   s = NSS_CMSContentInfo_SetContent_EnvelopedData(cmsMsg, cinfo, env);
   if (s != SECSuccess) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't set content enveloped data\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Step 6. Encode */
   NSSCMSEncoderContext *ecx;
   output.data = 0; output.len = 0;
   ecx = NSS_CMSEncoder_Start(cmsMsg, 0, 0, &output, arena,
 , ctx, 0, 0, 0, 0);
   if (!ecx) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't start cms encoder\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   s = NSS_CMSEncoder_Update(ecx, msg, strlen(msg));
   if (s != SECSuccess) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't update encoder\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   s = NSS_CMSEncoder_Finish(ecx);
   if (s != SECSuccess) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::SendMessage - can't finish encoder\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Step 7. Base64 encode and return the result */
   rv = encode(output.data, output.len, _retval);
 done:
   if (certDER) free((char *)certDER);
   if (cert) CERT_DestroyCertificate(cert);
   if (cmsMsg) NSS_CMSMessage_Destroy(cmsMsg);
   if (arena) PORT_FreeArena(arena, false);  /* false? */
   return rv;
 }
 /*
  * nsCMSSecureMessage::ReceiveMessage
  */
 nsresult nsCMSSecureMessage::
 ReceiveMessage(const char *msg, char **_retval)
 {
   nsNSSShutDownPreventionLock locker;
   PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::ReceiveMessage\n"));
   nsresult rv = NS_OK;
   NSSCMSDecoderContext *dcx;
   unsigned char *der = 0;
   int32_t derLen;
   NSSCMSMessage *cmsMsg = 0;
   SECItem *content;
   nsCOMPtr<nsIInterfaceRequestor> ctx = new PipUIContext();
   /* Step 1. Decode the base64 wrapper */
   rv = decode(msg, &der, &derLen);
   if (NS_FAILED(rv)) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::ReceiveMessage - can't base64 decode\n"));
     goto done;
   }
   dcx = NSS_CMSDecoder_Start(0, 0, 0, /* pw */ 0, ctx, /* key */ 0, 0);
   if (!dcx) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::ReceiveMessage - can't start decoder\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   (void)NSS_CMSDecoder_Update(dcx, (char *)der, derLen);
   cmsMsg = NSS_CMSDecoder_Finish(dcx);
   if (!cmsMsg) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::ReceiveMessage - can't finish decoder\n"));
     rv = NS_ERROR_FAILURE;
     /* Memory leak on dcx?? */
     goto done;
   }
   content = NSS_CMSMessage_GetContent(cmsMsg);
   if (!content) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::ReceiveMessage - can't get content\n"));
     rv = NS_ERROR_FAILURE;
     goto done;
   }
   /* Copy the data */
   *_retval = (char*)malloc(content->len+1);
   memcpy(*_retval, content->data, content->len);
   (*_retval)[content->len] = 0;
 done:
   if (der) free(der);
   if (cmsMsg) NSS_CMSMessage_Destroy(cmsMsg);
   return rv;
 }
 nsresult nsCMSSecureMessage::
 encode(const unsigned char *data, int32_t dataLen, char **_retval)
 {
   nsresult rv = NS_OK;
   *_retval = PL_Base64Encode((const char *)data, dataLen, nullptr);
   if (!*_retval) { rv = NS_ERROR_OUT_OF_MEMORY; goto loser; }
 loser:
   return rv;
 }
 nsresult nsCMSSecureMessage::
 decode(const char *data, unsigned char **result, int32_t * _retval)
 {
   PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::decode\n"));
   nsresult rv = NS_OK;
   uint32_t len = strlen(data);
   int adjust = 0;
   /* Compute length adjustment */
   if (data[len-1] == '=') {
     adjust++;
     if (data[len-2] == '=') adjust++;
   }
   *result = (unsigned char *)PL_Base64Decode(data, len, nullptr);
   if (!*result) {
     PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSSecureMessage::decode - error decoding base64\n"));
     rv = NS_ERROR_ILLEGAL_VALUE;
     goto loser;
   }
   *_retval = (len*3)/4 - adjust;
 loser:
   return rv;
 }

The Tor Browser / annotate

security/manager/ssl/src/nsCMSSecureMessage.cpp@b8a032363ba2 (annotated)

security/manager/ssl/src/nsCMSSecureMessage.cpp