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Merge "Revert to old-style API for EC_KEY handling"

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Kenny Root 2013-09-10 17:55:47 +00:00 committed by Gerrit Code Review
commit c7fe66ead0
4 changed files with 166 additions and 130 deletions
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4
keystore-engine/Android.mk
View file

@ -25,13 +25,15 @@ LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/ssl/engines
LOCAL_SRC_FILES := \
eng_keystore.cpp \
keyhandle.cpp \
ecdsa_meth.cpp \
dsa_meth.cpp \
rsa_meth.cpp
LOCAL_CFLAGS := -fvisibility=hidden -Wall -Werror
LOCAL_C_INCLUDES += \
external/openssl/include
external/openssl/include \
external/openssl
LOCAL_SHARED_LIBRARIES += \
libcrypto \

155
keystore-engine/ecdsa_meth.cpp Normal file
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@ -0,0 +1,155 @@
/*
* Copyright 2013 The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <utils/UniquePtr.h>
//#define LOG_NDEBUG 0
#define LOG_TAG "OpenSSL-keystore-ecdsa"
#include <cutils/log.h>
#include <binder/IServiceManager.h>
#include <keystore/IKeystoreService.h>
#include <openssl/ecdsa.h>
#include <openssl/engine.h>
// TODO replace this with real OpenSSL API when it exists
#include "crypto/ec/ec_lcl.h"
#include "crypto/ecdsa/ecs_locl.h"
#include "methods.h"
using namespace android;
struct ECDSA_SIG_Delete {
void operator()(ECDSA_SIG* p) const {
ECDSA_SIG_free(p);
}
};
typedef UniquePtr<ECDSA_SIG, struct ECDSA_SIG_Delete> Unique_ECDSA_SIG;
static ECDSA_SIG* keystore_ecdsa_do_sign(const unsigned char *dgst, int dlen,
const BIGNUM*, const BIGNUM*, EC_KEY *eckey) {
ALOGV("keystore_ecdsa_do_sign(%p, %d, %p)", dgst, dlen, eckey);
uint8_t* key_id = reinterpret_cast<uint8_t*>(EC_KEY_get_key_method_data(eckey,
ex_data_dup, ex_data_free, ex_data_clear_free));
if (key_id == NULL) {
ALOGE("key had no key_id!");
return 0;
}
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16("android.security.keystore"));
sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
if (service == NULL) {
ALOGE("could not contact keystore");
return 0;
}
int num = ECDSA_size(eckey);
uint8_t* reply = NULL;
size_t replyLen;
int32_t ret = service->sign(String16(reinterpret_cast<const char*>(key_id)), dgst,
dlen, &reply, &replyLen);
if (ret < 0) {
ALOGW("There was an error during dsa_do_sign: could not connect");
return 0;
} else if (ret != 0) {
ALOGW("Error during sign from keystore: %d", ret);
return 0;
} else if (replyLen <= 0) {
ALOGW("No valid signature returned");
return 0;
} else if (replyLen > (size_t) num) {
ALOGW("Signature is too large");
return 0;
}
Unique_ECDSA_SIG ecdsa_sig(d2i_ECDSA_SIG(NULL,
const_cast<const unsigned char**>(reinterpret_cast<unsigned char**>(&reply)),
replyLen));
if (ecdsa_sig.get() == NULL) {
ALOGW("conversion from DER to ECDSA_SIG failed");
return 0;
}
ALOGV("keystore_ecdsa_do_sign(%p, %d, %p) => returning %p len %llu", dgst, dlen, eckey,
ecdsa_sig.get(), replyLen);
return ecdsa_sig.release();
}
static ECDSA_METHOD keystore_ecdsa_meth = {
kKeystoreEngineId, /* name */
keystore_ecdsa_do_sign, /* ecdsa_do_sign */
NULL, /* ecdsa_sign_setup */
NULL, /* ecdsa_do_verify */
0, /* flags */
NULL, /* app_data */
};
static int register_ecdsa_methods() {
const ECDSA_METHOD* ecdsa_meth = ECDSA_OpenSSL();
keystore_ecdsa_meth.ecdsa_do_verify = ecdsa_meth->ecdsa_do_verify;
return 1;
}
int ecdsa_pkey_setup(ENGINE *e, EVP_PKEY *pkey, const char *key_id) {
Unique_EC_KEY eckey(EVP_PKEY_get1_EC_KEY(pkey));
void* oldData = EC_KEY_insert_key_method_data(eckey.get(),
reinterpret_cast<void*>(strdup(key_id)), ex_data_dup, ex_data_free,
ex_data_clear_free);
if (oldData != NULL) {
free(oldData);
}
ECDSA_set_method(eckey.get(), &keystore_ecdsa_meth);
/*
* "ECDSA_set_ENGINE()" should probably be an OpenSSL API. Since it isn't,
* and EC_KEY_free() calls ENGINE_finish(), we need to call ENGINE_init()
* here.
*/
ECDSA_DATA *ecdsa = ecdsa_check(eckey.get());
ENGINE_init(e);
ecdsa->engine = e;
return 1;
}
int ecdsa_register(ENGINE* e) {
if (!ENGINE_set_ECDSA(e, &keystore_ecdsa_meth)
|| !register_ecdsa_methods()) {
ALOGE("Could not set up keystore ECDSA methods");
return 0;
}
return 1;
}

133
keystore-engine/eng_keystore.cpp
View file

@ -66,11 +66,6 @@ int dsa_key_handle;
*/
static pthread_once_t key_handle_control = PTHREAD_ONCE_INIT;
/*
* Used for generic EVP_PKEY* handling (only for EC stuff currently)
*/
static EVP_PKEY_METHOD* keystore_pkey_ec_methods;
/**
* Many OpenSSL APIs take ownership of an argument on success but don't free the argument
* on failure. This means we need to tell our scoped pointers when we've transferred ownership,
@ -103,33 +98,6 @@ static void init_key_handle() {
dsa_key_handle = DSA_get_ex_new_index(0, NULL, keyhandle_new, keyhandle_dup, keyhandle_free);
}
static int pkey_setup(ENGINE *e, EVP_PKEY *pkey, const char *key_id) {
int ret = 1;
switch (EVP_PKEY_type(pkey->type)) {
case EVP_PKEY_EC: {
Unique_EC_KEY eckey(EVP_PKEY_get1_EC_KEY(pkey));
void* oldData = EC_KEY_insert_key_method_data(eckey.get(),
reinterpret_cast<void*>(strdup(key_id)), ex_data_dup, ex_data_free,
ex_data_clear_free);
if (oldData != NULL) {
free(oldData);
}
} break;
default:
ALOGW("Unsupported key type during setup %d", EVP_PKEY_type(pkey->type));
return 0;
}
if (ret != 1) {
return ret;
}
ENGINE_init(e);
pkey->engine = e;
return 1;
}
static EVP_PKEY* keystore_loadkey(ENGINE* e, const char* key_id, UI_METHOD* ui_method,
void* callback_data) {
#if LOG_NDEBUG
@ -179,7 +147,7 @@ static EVP_PKEY* keystore_loadkey(ENGINE* e, const char* key_id, UI_METHOD* ui_m
break;
}
case EVP_PKEY_EC: {
pkey_setup(e, pkey.get(), key_id);
ecdsa_pkey_setup(e, pkey.get(), key_id);
break;
}
default:
@ -194,107 +162,11 @@ static const ENGINE_CMD_DEFN keystore_cmd_defns[] = {
{0, NULL, NULL, 0}
};
static uint8_t* get_key_id(EVP_PKEY* pkey) {
switch (EVP_PKEY_type(pkey->type)) {
case EVP_PKEY_EC: {
Unique_EC_KEY eckey(EVP_PKEY_get1_EC_KEY(pkey));
return reinterpret_cast<uint8_t*>(EC_KEY_get_key_method_data(eckey.get(),
ex_data_dup, ex_data_free, ex_data_clear_free));
} break;
}
return NULL;
}
static int keystore_pkey_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbs_len) {
EVP_PKEY* pkey = EVP_PKEY_CTX_get0_pkey(ctx);
const uint8_t* key_id = get_key_id(pkey);
if (key_id == NULL) {
ALOGW("key_id is empty");
return 0;
}
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16("android.security.keystore"));
sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
if (service == NULL) {
ALOGE("could not contact keystore");
return 0;
}
uint8_t* reply = NULL;
size_t replyLen;
int32_t ret = service->sign(String16(reinterpret_cast<const char*>(key_id)), tbs, tbs_len,
&reply, &replyLen);
if (ret < 0) {
ALOGW("There was an error during signing: could not connect");
free(reply);
return 0;
} else if (ret != 0) {
ALOGW("Error during signing from keystore: %d", ret);
free(reply);
return 0;
} else if (replyLen <= 0) {
ALOGW("No valid signature returned");
return 0;
}
memcpy(sig, reply, replyLen);
free(reply);
*siglen = replyLen;
return 1;
}
static int register_pkey_methods(EVP_PKEY_METHOD** meth, int nid) {
*meth = EVP_PKEY_meth_new(nid, 0);
if (*meth == NULL) {
ALOGE("Failure allocating PKEY methods for NID %d", nid);
return 0;
}
const EVP_PKEY_METHOD* orig = EVP_PKEY_meth_find(nid);
EVP_PKEY_meth_copy(*meth, orig);
EVP_PKEY_meth_set_sign(*meth, NULL, keystore_pkey_sign);
return 1;
}
static int keystore_nids[] = {
EVP_PKEY_EC,
};
static int keystore_pkey_meths(ENGINE*, EVP_PKEY_METHOD** meth, const int **nids, int nid) {
if (meth == NULL) {
*nids = keystore_nids;
return sizeof(keystore_nids) / sizeof(keystore_nids[0]);
}
switch (nid) {
case EVP_PKEY_EC:
*meth = keystore_pkey_ec_methods;
return 1;
}
*meth = NULL;
return 0;
}
static int keystore_engine_setup(ENGINE* e) {
ALOGV("keystore_engine_setup");
if (!register_pkey_methods(&keystore_pkey_ec_methods, EVP_PKEY_EC)) {
ALOGE("Could not set up keystore engine");
return 0;
}
if (!ENGINE_set_id(e, kKeystoreEngineId)
|| !ENGINE_set_name(e, kKeystoreEngineDesc)
|| !ENGINE_set_pkey_meths(e, keystore_pkey_meths)
|| !ENGINE_set_load_privkey_function(e, keystore_loadkey)
|| !ENGINE_set_load_pubkey_function(e, keystore_loadkey)
|| !ENGINE_set_flags(e, 0)
@ -313,6 +185,9 @@ static int keystore_engine_setup(ENGINE* e) {
if (!dsa_register(e)) {
ALOGE("DSA registration failed");
return 0;
} else if (!ecdsa_register(e)) {
ALOGE("ECDSA registration failed");
return 0;
} else if (!rsa_register(e)) {
ALOGE("RSA registration failed");
return 0;

4
keystore-engine/methods.h
View file

@ -61,6 +61,10 @@ void *ex_data_dup(void *);
void ex_data_free(void *);
void ex_data_clear_free(void *);
/* ECDSA */
int ecdsa_register(ENGINE *);
int ecdsa_pkey_setup(ENGINE *, EVP_PKEY*, const char*);
/* DSA */
int dsa_register(ENGINE *);
int dsa_pkey_setup(ENGINE *, EVP_PKEY*, const char*);