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/* 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 <stdio.h>
#include "nspr.h"
#include "ScopedNSSTypes.h"
#include "ssl.h"
#include "ssl3prot.h"
#include "sslexp.h"
#include "sslimpl.h"
#include "TLSServer.h"
#include "mozilla/Sprintf.h"
using namespace mozilla;
using namespace mozilla::test;
enum FaultType {
None = 0,
ZeroRtt,
UnknownSNI,
};
struct FaultyServerHost {
const char* mHostName;
const char* mCertName;
FaultType mFaultType;
};
const char* kHostOk = "ok.example.com";
const char* kHostUnknown = "unknown.example.com";
const char* kHostZeroRttAlertBadMac = "0rtt-alert-bad-mac.example.com";
const char* kHostZeroRttAlertVersion =
"0rtt-alert-protocol-version.example.com";
const char* kHostZeroRttAlertUnexpected = "0rtt-alert-unexpected.example.com";
const char* kHostZeroRttAlertDowngrade = "0rtt-alert-downgrade.example.com";
const char* kCertWildcard = "default-ee";
/* Each type of failure gets a different SNI.
* the "default-ee" cert has a SAN for *.example.com
* the "no-san-ee" cert is signed by the test-ca, but it doesn't have any SANs.
*/
const FaultyServerHost sFaultyServerHosts[]{
{kHostOk, kCertWildcard, None},
{kHostUnknown, kCertWildcard, UnknownSNI},
{kHostZeroRttAlertBadMac, kCertWildcard, ZeroRtt},
{kHostZeroRttAlertVersion, kCertWildcard, ZeroRtt},
{kHostZeroRttAlertUnexpected, kCertWildcard, ZeroRtt},
{kHostZeroRttAlertDowngrade, kCertWildcard, ZeroRtt},
{nullptr, nullptr},
};
nsresult SendAll(PRFileDesc* aSocket, const char* aData, size_t aDataLen) {
if (gDebugLevel >= DEBUG_VERBOSE) {
fprintf(stderr, "sending '%s'\n", aData);
}
int32_t len = static_cast<int32_t>(aDataLen);
while (len > 0) {
int32_t bytesSent = PR_Send(aSocket, aData, len, 0, PR_INTERVAL_NO_TIMEOUT);
if (bytesSent == -1) {
PrintPRError("PR_Send failed");
return NS_ERROR_FAILURE;
}
len -= bytesSent;
aData += bytesSent;
}
return NS_OK;
}
// returns 0 on success, non-zero on error
int DoCallback(const char* path) {
UniquePRFileDesc socket(PR_NewTCPSocket());
if (!socket) {
PrintPRError("PR_NewTCPSocket failed");
return 1;
}
uint32_t port = 0;
const char* callbackPort = PR_GetEnv("FAULTY_SERVER_CALLBACK_PORT");
if (callbackPort) {
port = atoi(callbackPort);
}
if (!port) {
return 0;
}
PRNetAddr addr;
PR_InitializeNetAddr(PR_IpAddrLoopback, port, &addr);
if (PR_Connect(socket.get(), &addr, PR_INTERVAL_NO_TIMEOUT) != PR_SUCCESS) {
PrintPRError("PR_Connect failed");
return 1;
}
char request[512];
SprintfLiteral(request, "GET %s HTTP/1.0\r\n\r\n", path);
SendAll(socket.get(), request, strlen(request));
char buf[4096];
memset(buf, 0, sizeof(buf));
int32_t bytesRead =
PR_Recv(socket.get(), buf, sizeof(buf) - 1, 0, PR_INTERVAL_NO_TIMEOUT);
if (bytesRead < 0) {
PrintPRError("PR_Recv failed 1");
return 1;
}
if (bytesRead == 0) {
fprintf(stderr, "PR_Recv eof 1\n");
return 1;
}
// fprintf(stderr, "%s\n", buf);
return 0;
}
/* These are very rough examples. In practice the `arg` parameter to a callback
* might need to be an object that holds some state, like the various traffic
* secrets. */
/* An SSLSecretCallback is called after every key derivation step in the TLS
* 1.3 key schedule.
*
* Epoch 1 is for the early traffic secret.
* Epoch 2 is for the handshake traffic secrets.
* Epoch 3 is for the application traffic secrets.
*/
void SecretCallbackFailZeroRtt(PRFileDesc* fd, PRUint16 epoch,
SSLSecretDirection dir, PK11SymKey* secret,
void* arg) {
fprintf(stderr, "0RTT handler epoch=%d dir=%d\n", epoch, (uint32_t)dir);
FaultyServerHost* host = static_cast<FaultyServerHost*>(arg);
if (epoch == 1 && dir == ssl_secret_read) {
sslSocket* ss = ssl_FindSocket(fd);
if (!ss) {
fprintf(stderr, "0RTT handler, no ss!\n");
return;
}
char path[256];
SprintfLiteral(path, "/callback/%d", epoch);
DoCallback(path);
fprintf(stderr, "0RTT handler, configuring alert\n");
if (!strcmp(host->mHostName, kHostZeroRttAlertBadMac)) {
SSL3_SendAlert(ss, alert_fatal, bad_record_mac);
} else if (!strcmp(host->mHostName, kHostZeroRttAlertVersion)) {
SSL3_SendAlert(ss, alert_fatal, protocol_version);
} else if (!strcmp(host->mHostName, kHostZeroRttAlertUnexpected)) {
SSL3_SendAlert(ss, alert_fatal, no_alert);
}
}
}
/* An SSLRecordWriteCallback can replace the TLS record layer. */
SECStatus WriteCallbackExample(PRFileDesc* fd, PRUint16 epoch,
SSLContentType contentType, const PRUint8* data,
unsigned int len, void* arg) {
/* do something */
return SECSuccess;
}
int32_t DoSNISocketConfig(PRFileDesc* aFd, const SECItem* aSrvNameArr,
uint32_t aSrvNameArrSize, void* aArg) {
const FaultyServerHost* host =
GetHostForSNI(aSrvNameArr, aSrvNameArrSize, sFaultyServerHosts);
if (!host || host->mFaultType == UnknownSNI) {
PrintPRError("No cert found for hostname");
return SSL_SNI_SEND_ALERT;
}
if (gDebugLevel >= DEBUG_VERBOSE) {
fprintf(stderr, "found pre-defined host '%s'\n", host->mHostName);
}
switch (host->mFaultType) {
case ZeroRtt:
SSL_SecretCallback(aFd, &SecretCallbackFailZeroRtt, (void*)host);
break;
case None:
break;
default:
break;
}
UniqueCERTCertificate cert;
SSLKEAType certKEA;
if (SECSuccess != ConfigSecureServerWithNamedCert(aFd, host->mCertName, &cert,
&certKEA, nullptr)) {
return SSL_SNI_SEND_ALERT;
}
return 0;
}
SECStatus ConfigureServer(PRFileDesc* aFd) { return SECSuccess; }
int main(int argc, char* argv[]) {
int rv = StartServer(argc, argv, DoSNISocketConfig, nullptr, ConfigureServer);
if (rv < 0) {
return rv;
}
}
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