152 lines
4.8 KiB
C++
152 lines
4.8 KiB
C++
/*
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* Copyright 2013 The Android Open Source Project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <UniquePtr.h>
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//#define LOG_NDEBUG 0
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#define LOG_TAG "OpenSSL-keystore-dsa"
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#include <cutils/log.h>
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#include <binder/IServiceManager.h>
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#include <keystore/IKeystoreService.h>
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#include <openssl/dsa.h>
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#include <openssl/engine.h>
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#include "methods.h"
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using namespace android;
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struct DSA_SIG_Delete {
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void operator()(DSA_SIG* p) const {
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DSA_SIG_free(p);
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}
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};
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typedef UniquePtr<DSA_SIG, struct DSA_SIG_Delete> Unique_DSA_SIG;
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static DSA_SIG* keystore_dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) {
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ALOGV("keystore_dsa_do_sign(%p, %d, %p)", dgst, dlen, dsa);
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uint8_t* key_id = reinterpret_cast<uint8_t*>(DSA_get_ex_data(dsa, dsa_key_handle));
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if (key_id == NULL) {
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ALOGE("key had no key_id!");
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return 0;
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}
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sp<IServiceManager> sm = defaultServiceManager();
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sp<IBinder> binder = sm->getService(String16("android.security.keystore"));
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sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
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if (service == NULL) {
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ALOGE("could not contact keystore");
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return 0;
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}
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int num = DSA_size(dsa);
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uint8_t* reply = NULL;
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size_t replyLen;
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int32_t ret = service->sign(String16(reinterpret_cast<const char*>(key_id)), dgst,
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dlen, &reply, &replyLen);
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if (ret < 0) {
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ALOGW("There was an error during dsa_do_sign: could not connect");
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return 0;
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} else if (ret != 0) {
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ALOGW("Error during sign from keystore: %d", ret);
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return 0;
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} else if (replyLen <= 0) {
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ALOGW("No valid signature returned");
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return 0;
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} else if (replyLen > (size_t) num) {
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ALOGW("Signature is too large");
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return 0;
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}
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Unique_DSA_SIG dsa_sig(d2i_DSA_SIG(NULL,
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const_cast<const unsigned char**>(reinterpret_cast<unsigned char**>(&reply)),
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replyLen));
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if (dsa_sig.get() == NULL) {
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ALOGW("conversion from DER to DSA_SIG failed");
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return 0;
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}
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ALOGV("keystore_dsa_do_sign(%p, %d, %p) => returning %p len %zu", dgst, dlen, dsa,
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dsa_sig.get(), replyLen);
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return dsa_sig.release();
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}
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static DSA_METHOD keystore_dsa_meth = {
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kKeystoreEngineId, /* name */
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keystore_dsa_do_sign, /* dsa_do_sign */
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NULL, /* dsa_sign_setup */
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NULL, /* dsa_do_verify */
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NULL, /* dsa_mod_exp */
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NULL, /* bn_mod_exp */
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NULL, /* init */
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NULL, /* finish */
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0, /* flags */
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NULL, /* app_data */
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NULL, /* dsa_paramgen */
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NULL, /* dsa_keygen */
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};
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static int register_dsa_methods() {
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const DSA_METHOD* dsa_meth = DSA_OpenSSL();
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keystore_dsa_meth.dsa_do_verify = dsa_meth->dsa_do_verify;
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return 1;
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}
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int dsa_pkey_setup(ENGINE *e, EVP_PKEY *pkey, const char *key_id) {
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Unique_DSA dsa(EVP_PKEY_get1_DSA(pkey));
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if (!DSA_set_ex_data(dsa.get(), dsa_key_handle, reinterpret_cast<void*>(strdup(key_id)))) {
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ALOGW("Could not set ex_data for loaded DSA key");
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return 0;
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}
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DSA_set_method(dsa.get(), &keystore_dsa_meth);
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/*
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* "DSA_set_ENGINE()" should probably be an OpenSSL API. Since it isn't,
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* and EVP_PKEY_free() calls ENGINE_finish(), we need to call ENGINE_init()
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* here.
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*/
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ENGINE_init(e);
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dsa->engine = e;
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return 1;
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}
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int dsa_register(ENGINE* e) {
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if (!ENGINE_set_DSA(e, &keystore_dsa_meth)
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|| !register_dsa_methods()) {
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ALOGE("Could not set up keystore DSA methods");
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return 0;
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}
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return 1;
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}
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