gecko-dev/mozglue/android/NSSBridge.cpp

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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 <stdlib.h>
#include "dlfcn.h"
#include "NSSBridge.h"
#include "APKOpen.h"
#ifdef ANDROID
#include <jni.h>
#include <android/log.h>
#endif
#include "ElfLoader.h"
#ifdef DEBUG
#define LOG(x...) __android_log_print(ANDROID_LOG_INFO, "GeckoJNI", x)
#else
#define LOG(x...)
#endif
static bool initialized = false;
#define NSS_WRAPPER_INT(name) name ## _t f_ ## name;
NSS_WRAPPER_INT(NSS_Initialize)
NSS_WRAPPER_INT(NSS_Shutdown)
NSS_WRAPPER_INT(SECITEM_ZfreeItem)
NSS_WRAPPER_INT(PK11SDR_Encrypt)
NSS_WRAPPER_INT(PK11SDR_Decrypt)
NSS_WRAPPER_INT(PK11_GetInternalKeySlot)
NSS_WRAPPER_INT(PK11_NeedUserInit)
NSS_WRAPPER_INT(PK11_InitPin)
NSS_WRAPPER_INT(PR_ErrorToString)
NSS_WRAPPER_INT(PR_GetError)
NSS_WRAPPER_INT(PR_Free)
NSS_WRAPPER_INT(PL_Base64Encode)
NSS_WRAPPER_INT(PL_Base64Decode)
NSS_WRAPPER_INT(PL_strfree)
int
setup_nss_functions(void *nss_handle,
void *nspr_handle,
void *plc_handle)
{
if (nss_handle == nullptr || nspr_handle == nullptr || plc_handle == nullptr) {
LOG("Missing handle\n");
return FAILURE;
}
#define GETFUNC(name) f_ ## name = (name ## _t) (uintptr_t) __wrap_dlsym(nss_handle, #name); \
if (!f_ ##name) { __android_log_print(ANDROID_LOG_ERROR, "GeckoJNI", "missing %s", #name); return FAILURE; }
GETFUNC(NSS_Initialize);
GETFUNC(NSS_Shutdown);
GETFUNC(PK11SDR_Encrypt);
GETFUNC(PK11SDR_Decrypt);
GETFUNC(PK11_GetInternalKeySlot);
GETFUNC(PK11_NeedUserInit);
GETFUNC(PK11_InitPin);
GETFUNC(SECITEM_ZfreeItem);
#undef GETFUNC
#define NSPRFUNC(name) f_ ## name = (name ## _t) (uintptr_t) __wrap_dlsym(nspr_handle, #name); \
if (!f_ ##name) { __android_log_print(ANDROID_LOG_ERROR, "GeckoJNI", "missing %s", #name); return FAILURE; }
NSPRFUNC(PR_ErrorToString);
NSPRFUNC(PR_GetError);
NSPRFUNC(PR_Free);
#undef NSPRFUNC
#define PLCFUNC(name) f_ ## name = (name ## _t) (uintptr_t) __wrap_dlsym(plc_handle, #name); \
if (!f_ ##name) { __android_log_print(ANDROID_LOG_ERROR, "GeckoJNI", "missing %s", #name); return FAILURE; }
PLCFUNC(PL_Base64Encode);
PLCFUNC(PL_Base64Decode);
PLCFUNC(PL_strfree);
#undef PLCFUNC
return SUCCESS;
}
/* Throws the current NSS error. */
static void
throwError(JNIEnv* jenv, const char * funcString) {
char *msg;
PRErrorCode perr = f_PR_GetError();
char * errString = f_PR_ErrorToString(perr, 0);
asprintf(&msg, "%s returned error %d: %s\n", funcString, perr, errString);
LOG("Throwing error: %s\n", msg);
JNI_Throw(jenv, "java/lang/Exception", msg);
free(msg);
LOG("Error thrown\n");
}
extern "C" NS_EXPORT jstring JNICALL
Java_org_mozilla_gecko_NSSBridge_nativeEncrypt(JNIEnv* jenv, jclass,
jstring jPath,
jstring jValue)
{
jstring ret = jenv->NewStringUTF("");
const char* path;
path = jenv->GetStringUTFChars(jPath, nullptr);
const char* value;
value = jenv->GetStringUTFChars(jValue, nullptr);
char* result;
SECStatus rv = doCrypto(jenv, path, value, &result, true);
if (rv == SECSuccess) {
ret = jenv->NewStringUTF(result);
free(result);
}
jenv->ReleaseStringUTFChars(jValue, value);
jenv->ReleaseStringUTFChars(jPath, path);
return ret;
}
extern "C" NS_EXPORT jstring JNICALL
Java_org_mozilla_gecko_NSSBridge_nativeDecrypt(JNIEnv* jenv, jclass,
jstring jPath,
jstring jValue)
{
jstring ret = jenv->NewStringUTF("");
const char* path;
path = jenv->GetStringUTFChars(jPath, nullptr);
const char* value;
value = jenv->GetStringUTFChars(jValue, nullptr);
char* result;
SECStatus rv = doCrypto(jenv, path, value, &result, false);
if (rv == SECSuccess) {
ret = jenv->NewStringUTF(result);
free(result);
}
jenv->ReleaseStringUTFChars(jValue, value);
jenv->ReleaseStringUTFChars(jPath, path);
return ret;
}
/* Encrypts or decrypts a string. result should be freed with free() when done */
SECStatus
doCrypto(JNIEnv* jenv, const char *path, const char *value, char** result, bool encrypt)
{
SECStatus rv;
PK11SlotInfo *slot;
if (!initialized) {
LOG("Initialize crypto in %s\n", path);
rv = f_NSS_Initialize(path, "", "", "secmod.db", NSS_INIT_NOROOTINIT);
if (rv != SECSuccess) {
throwError(jenv, "NSS_Initialize");
return rv;
}
initialized = true;
}
slot = f_PK11_GetInternalKeySlot();
if (!slot) {
throwError(jenv, "PK11_GetInternalKeySlot");
return SECFailure;
}
if (f_PK11_NeedUserInit(slot)) {
LOG("Initializing key3.db with default blank password.\n");
rv = f_PK11_InitPin(slot, nullptr, nullptr);
if (rv != SECSuccess) {
throwError(jenv, "PK11_InitPin");
return rv;
}
}
SECItem request;
SECItem reply;
reply.data = 0;
reply.len = 0;
if (encrypt) {
// This can print sensitive data. Uncomment if you need it.
// LOG("Encrypting: %s\n", value);
request.data = (unsigned char*)value;
request.len = strlen(value);
SECItem keyid;
keyid.data = 0;
keyid.len = 0;
rv = f_PK11SDR_Encrypt(&keyid, &request, &reply, nullptr);
if (rv != SECSuccess) {
throwError(jenv, "PK11SDR_Encrypt");
goto done;
}
rv = encode(reply.data, reply.len, result);
if (rv != SECSuccess) {
throwError(jenv, "encode");
goto done;
}
LOG("Encrypted: %s\n", *result);
} else {
LOG("Decoding: %s\n", value);
rv = decode(value, &request.data, (int32_t*)&request.len);
if (rv != SECSuccess) {
throwError(jenv, "decode");
return rv;
}
rv = f_PK11SDR_Decrypt(&request, &reply, nullptr);
if (rv != SECSuccess) {
throwError(jenv, "PK11SDR_Decrypt");
goto done;
}
*result = (char *)malloc(reply.len+1);
strncpy(*result, (char *)reply.data, reply.len);
(*result)[reply.len] = '\0';
// This can print sensitive data. Uncomment if you need it.
// LOG("Decoded %i letters: %s\n", reply.len, *result);
free(request.data);
}
done:
f_SECITEM_ZfreeItem(&reply, false);
return rv;
}
/*
* Base64 encodes the data passed in. The caller must deallocate _retval using free();
*/
SECStatus
encode(const unsigned char *data, int32_t dataLen, char **_retval)
{
SECStatus rv = SECSuccess;
char *encoded = f_PL_Base64Encode((const char *)data, dataLen, nullptr);
if (!encoded)
rv = SECFailure;
if (!*encoded)
rv = SECFailure;
if (rv == SECSuccess) {
*_retval = (char *)malloc(strlen(encoded)+1);
strcpy(*_retval, encoded);
}
if (encoded) {
f_PR_Free(encoded);
}
return rv;
}
/*
* Base64 decodes the data passed in. The caller must deallocate result using free();
*/
SECStatus
decode(const char *data, unsigned char **result, int32_t *length)
{
SECStatus rv = SECSuccess;
uint32_t len = strlen(data);
int adjust = 0;
/* Compute length adjustment */
if (len > 0 && data[len-1] == '=') {
adjust++;
if (data[len-2] == '=') adjust++;
}
char *decoded;
decoded = f_PL_Base64Decode(data, len, nullptr);
if (!decoded) {
return SECFailure;
}
if (!*decoded) {
return SECFailure;
}
*length = (len*3)/4 - adjust;
LOG("Decoded %i chars into %i chars\n", len, *length);
*result = (unsigned char*)malloc((size_t)len);
if (!*result) {
rv = SECFailure;
} else {
memcpy((char*)*result, decoded, len);
}
f_PR_Free(decoded);
return rv;
}