Fix several cert problems on Linux (take 2)

net/base/ssl_client_socket_nss.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/ssl_client_socket_nss.h"
 
 #include <nspr.h>
 #include <nss.h>
+#include <secerr.h>
 // Work around https://bugzilla.mozilla.org/show_bug.cgi?id=455424
 // until NSS 3.12.2 comes out and we update to it.
 #define Lock FOO_NSS_Lock
 #include <ssl.h>
+#include <sslerr.h>
 #include <pk11pub.h>
 #undef Lock
 
 #include "base/logging.h"
 #include "base/nss_init.h"
 #include "base/string_util.h"
 #include "net/base/net_errors.h"
 #include "net/base/ssl_info.h"
 
 static const int kRecvBufferSize = 4096;
 
-/*
- * nss calls this if an incoming certificate is invalid.
- * TODO(port): expose to app via GetSSLInfo so it can put up 
- * the appropriate GUI and retry with override if desired
- */
+// nss calls this if an incoming certificate is invalid.
 static SECStatus
 ownBadCertHandler(void * arg, PRFileDesc * socket)
 {
     PRErrorCode err = PR_GetError();
-    LOG(ERROR) << "server certificate is invalid; NSS error code " << err;
-    // Return SECSuccess to override the problem, SECFailure to let the original function fail
-    return SECSuccess;  /* override, say it's OK. */
+    LOG(INFO) << "server certificate is invalid; NSS error code " << err;
+    // Return SECSuccess to override the problem, 
+    // or SECFailure to let the original function fail
+    // Chromium wants it to fail here, and may retry it later.
+    return SECFailure;
 }
 
 
 namespace net {
 
 // State machines are easier to debug if you log state transitions.
 // Enable these if you want to see what's going on.
 #if 1
 #define EnterFunction(x)
 #define LeaveFunction(x)
 #define GotoState(s) next_state_ = s
+#define LogData(s, len)
 #else
 #define EnterFunction(x)  LOG(INFO) << (void *)this << " " << __FUNCTION__ << \
                            " enter " << x << "; next_state " << next_state_
 #define LeaveFunction(x)  LOG(INFO) << (void *)this << " " << __FUNCTION__ << \
                            " leave " << x << "; next_state " << next_state_
 #define GotoState(s) do { LOG(INFO) << (void *)this << " " << __FUNCTION__ << \
                            " jump to state " << s; next_state_ = s; } while (0)
+#define LogData(s, len)   LOG(INFO) << (void *)this << " " << __FUNCTION__ << \
+                           " data [" << std::string(s, len) << "]";
+
 #endif
 
+namespace {
+
+int NetErrorFromNSPRError(PRErrorCode err) {
+  // TODO(port): fill this out as we learn what's important
+  switch (err) {
+    case PR_WOULD_BLOCK_ERROR:
+      return ERR_IO_PENDING;
+    case SSL_ERROR_NO_CYPHER_OVERLAP:
+      return ERR_SSL_VERSION_OR_CIPHER_MISMATCH;
+    case SSL_ERROR_BAD_CERT_DOMAIN:
+      return ERR_CERT_COMMON_NAME_INVALID;
+    case SEC_ERROR_EXPIRED_CERTIFICATE:
+      return ERR_CERT_DATE_INVALID;
+    case SEC_ERROR_BAD_SIGNATURE:
+      return ERR_CERT_INVALID;
+    case SSL_ERROR_REVOKED_CERT_ALERT:
+    case SEC_ERROR_REVOKED_CERTIFICATE:
+    case SEC_ERROR_REVOKED_KEY:
+      return ERR_CERT_REVOKED;
+    case SEC_ERROR_UNKNOWN_ISSUER:
+      return ERR_CERT_AUTHORITY_INVALID;
+
+    default: {
+      if (IS_SSL_ERROR(err)) {
+        LOG(WARNING) << "Unknown SSL error " << err <<
+            " mapped to net::ERR_SSL_PROTOCOL_ERROR";
+        return ERR_SSL_PROTOCOL_ERROR;
+      }
+      if (IS_SEC_ERROR(err)) {
+        // TODO(port): Probably not the best mapping
+        LOG(WARNING) << "Unknown SEC error " << err <<
+            " mapped to net::ERR_CERT_INVALID";
+        return ERR_CERT_INVALID;
+      }
+      LOG(WARNING) << "Unknown error " << err <<
+          " mapped to net::ERR_FAILED";
+      return ERR_FAILED;
+    }
+  }
+}
+
+// Shared with the Windows code. TODO(avi): merge to a common place
+int CertStatusFromNetError(int error) {
+  switch (error) {
+    case ERR_CERT_COMMON_NAME_INVALID:
+      return CERT_STATUS_COMMON_NAME_INVALID;
+    case ERR_CERT_DATE_INVALID:
+      return CERT_STATUS_DATE_INVALID;
+    case ERR_CERT_AUTHORITY_INVALID:
+      return CERT_STATUS_AUTHORITY_INVALID;
+    case ERR_CERT_NO_REVOCATION_MECHANISM:
+      return CERT_STATUS_NO_REVOCATION_MECHANISM;
+    case ERR_CERT_UNABLE_TO_CHECK_REVOCATION:
+      return CERT_STATUS_UNABLE_TO_CHECK_REVOCATION;
+    case ERR_CERT_REVOKED:
+      return CERT_STATUS_REVOKED;
+    case ERR_CERT_CONTAINS_ERRORS:
+      NOTREACHED();
+      // Falls through.
+    case ERR_CERT_INVALID:
+      return CERT_STATUS_INVALID;
+    default:
+      return 0;
+  }
+}
+
+}  // namespace
+
 bool SSLClientSocketNSS::nss_options_initialized_ = false;
 
 SSLClientSocketNSS::SSLClientSocketNSS(ClientSocket* transport_socket,
                                        const std::string& hostname,
                                        const SSLConfig& ssl_config)
     : 
       buffer_send_callback_(this, &SSLClientSocketNSS::BufferSendComplete),
       buffer_recv_callback_(this, &SSLClientSocketNSS::BufferRecvComplete),
       transport_send_busy_(false),
       transport_recv_busy_(false),
       io_callback_(this, &SSLClientSocketNSS::OnIOComplete),
       transport_(transport_socket),
       hostname_(hostname),
       ssl_config_(ssl_config),
       user_callback_(NULL),
       user_buf_(NULL),
       user_buf_len_(0),
+      server_cert_status_(0),
       completed_handshake_(false),
       next_state_(STATE_NONE),
       nss_fd_(NULL),
       nss_bufs_(NULL) {
   EnterFunction("");
 }
 
 SSLClientSocketNSS::~SSLClientSocketNSS() {
   EnterFunction("");
   Disconnect();
@@ skipping 58 matching lines @@
   DCHECK(!user_callback_);
   DCHECK(!user_buf_);
 
   user_buf_ = buf;
   user_buf_len_ = buf_len;
 
   GotoState(STATE_PAYLOAD_READ);
   int rv = DoLoop(OK);
   if (rv == ERR_IO_PENDING)
     user_callback_ = callback;
-  LeaveFunction("");
+  LeaveFunction(rv);
   return rv;
 }
 
 int SSLClientSocketNSS::Write(const char* buf, int buf_len,
                            CompletionCallback* callback) {
   EnterFunction(buf_len);
   DCHECK(completed_handshake_);
   DCHECK(next_state_ == STATE_NONE);
   DCHECK(!user_callback_);
   DCHECK(!user_buf_);
 
   user_buf_ = const_cast<char*>(buf);
   user_buf_len_ = buf_len;
 
   GotoState(STATE_PAYLOAD_WRITE);
   int rv = DoLoop(OK);
   if (rv == ERR_IO_PENDING)
     user_callback_ = callback;
-  LeaveFunction("");
+  LeaveFunction(rv);
   return rv;
 }
 
 void SSLClientSocketNSS::GetSSLInfo(SSLInfo* ssl_info) {
   EnterFunction("");
-  // TODO(port): implement!
   ssl_info->Reset();
+  SSLChannelInfo channel_info;
+  SECStatus ok = SSL_GetChannelInfo(nss_fd_, 
+                                    &channel_info, sizeof(channel_info));
+  if (ok == SECSuccess) {
+    SSLCipherSuiteInfo cipher_info;
+    ok = SSL_GetCipherSuiteInfo(channel_info.cipherSuite, 
+                                &cipher_info, sizeof(cipher_info));
+    if (ok == SECSuccess) {
+      ssl_info->security_bits = cipher_info.effectiveKeyBits;
+    } else {
+      ssl_info->security_bits = -1;
+      NOTREACHED();
+    }
+  }
+  ssl_info->cert_status = server_cert_status_;
+  // TODO(port): implement X509Certificate so we can set the cert field!
+  // CERTCertificate *nssCert = SSL_PeerCertificate(nss_fd_);
   LeaveFunction("");
 }
 
 void SSLClientSocketNSS::DoCallback(int rv) {
   EnterFunction(rv);
   DCHECK(rv != ERR_IO_PENDING);
   DCHECK(user_callback_);
 
   // since Run may result in Read being called, clear user_callback_ up front.
   CompletionCallback* c = user_callback_;
@@ skipping 183 matching lines @@
   int rv;
 
   rv = SSL_OptionSet(nss_fd_, SSL_SECURITY, PR_TRUE);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
 
   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL2, ssl_config_.ssl2_enabled);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
 
+  // SNI is enabled automatically if TLS is enabled -- as long as
+  // SSL_V2_COMPATIBLE_HELLO isn't.  
+  // So don't do V2 compatible hellos unless we're really using SSL2,
+  // to avoid errors like
+  // "common name `mail.google.com' != requested host name `gmail.com'"
+  rv = SSL_OptionSet(nss_fd_, SSL_V2_COMPATIBLE_HELLO, 
+                     ssl_config_.ssl2_enabled);
+  if (rv != SECSuccess)
+     return ERR_UNEXPECTED;
+
   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL3, ssl_config_.ssl3_enabled);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
 
-  rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL3, ssl_config_.tls1_enabled);
+  rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_TLS, ssl_config_.tls1_enabled);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
 
+#ifdef SSL_ENABLE_SESSION_TICKETS
+  // Support RFC 5077
+  rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SESSION_TICKETS, PR_TRUE);
+  if (rv != SECSuccess)
+     LOG(INFO) << "SSL_ENABLE_SESSION_TICKETS failed.  Old system nss?";
+#else
+  #error "You need to install NSS-3.12 or later to build chromium"
+#endif
+
   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
   
   rv = SSL_BadCertHook(nss_fd_, ownBadCertHandler, NULL);
   if (rv != SECSuccess)
      return ERR_UNEXPECTED;
 
   // Tell SSL the hostname we're trying to connect to.
   SSL_SetURL(nss_fd_, hostname_.c_str());
 
   // Tell SSL we're a client; needed if not letting NSPR do socket I/O
   SSL_ResetHandshake(nss_fd_, 0);
   GotoState(STATE_HANDSHAKE_READ);
   // Return OK so DoLoop tries handshaking
   LeaveFunction("");
   return OK;
 }
 
 int SSLClientSocketNSS::DoHandshakeRead() {
   EnterFunction("");
+  int net_error;
   int rv = SSL_ForceHandshake(nss_fd_);
+
   if (rv == SECSuccess) {
+    net_error = OK;
     // there's a callback for this, too
     completed_handshake_ = true;
     // Indicate we're ready to handle I/O.  Badly named?
     GotoState(STATE_NONE);
-    LeaveFunction("");
-    return OK;
+  } else {
+    PRErrorCode prerr = PR_GetError();
+    net_error = NetErrorFromNSPRError(prerr);
+
+    // If not done, stay in this state
+    if (net_error == ERR_IO_PENDING) {
+      GotoState(STATE_HANDSHAKE_READ);
+    } else {
+      server_cert_status_ = CertStatusFromNetError(net_error);
+      LOG(ERROR) << "handshake failed; NSS error code " << prerr 
+                 << ", net_error " << net_error << ", server_cert_status " << server_cert_status_;
+    }
   }
-  PRErrorCode prerr = PR_GetError();
-  if (prerr == PR_WOULD_BLOCK_ERROR) {
-    // at this point, it should have tried to send some bytes
-    GotoState(STATE_HANDSHAKE_READ);
-    LeaveFunction("");
-    return ERR_IO_PENDING;
-  }
-  // TODO: map rv to net error code properly
+
   LeaveFunction("");
-  return ERR_SSL_PROTOCOL_ERROR;
+  return net_error;
 }
     
 int SSLClientSocketNSS::DoPayloadRead() {
   EnterFunction(user_buf_len_);
   int rv = PR_Read(nss_fd_, user_buf_, user_buf_len_);
   if (rv >= 0) {
+    LogData(user_buf_, rv);
     user_buf_ = NULL;
     LeaveFunction("");
     return rv;
   }
   PRErrorCode prerr = PR_GetError();
   if (prerr == PR_WOULD_BLOCK_ERROR) {
     GotoState(STATE_PAYLOAD_READ);
     LeaveFunction("");
     return ERR_IO_PENDING;
   }
   user_buf_ = NULL;
   LeaveFunction("");
   // TODO: map rv to net error code properly
   return ERR_SSL_PROTOCOL_ERROR;
 }
 
 int SSLClientSocketNSS::DoPayloadWrite() {
   EnterFunction(user_buf_len_);
   int rv = PR_Write(nss_fd_, user_buf_, user_buf_len_);
   if (rv >= 0) {
+    LogData(user_buf_, rv);
     user_buf_ = NULL;
     LeaveFunction("");
     return rv;
   }
   PRErrorCode prerr = PR_GetError();
   if (prerr == PR_WOULD_BLOCK_ERROR) {
     GotoState(STATE_PAYLOAD_WRITE);
     return ERR_IO_PENDING;
   }
   user_buf_ = NULL;
   LeaveFunction("");
   // TODO: map rv to net error code properly
   return ERR_SSL_PROTOCOL_ERROR;
 }
 
 }  // namespace net