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authorKyungwook Tak <k.tak@samsung.com>2016-07-18 03:54:40 (GMT)
committerKyungwook Tak <k.tak@samsung.com>2016-07-19 02:32:22 (GMT)
commit99ad3b114bce6ba5743f74c39079d524781134cd (patch)
treee7a247f32834b4d2ba00bbcfcc7a786b52cd8a01
parentf72179753846682e783bbc4dbe1a3a570e7fac23 (diff)
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Support platform upgrade caserefs/changes/34/79634/5
secure-storage is removed since Tizen platform version 3.0. downloaded web apps encryption works based on different key from lower than 3.0. secure-storage used DUK(device unique key with seed(pkgid)) as DEK. If downloaded app cannot find DEK when decrypt, it's considered as encrypted lower than 3.0 case. So webappenc creates DEK and uses algorithm which had been used lower than 3.0 in secure-storage. For now it's hard to save newly created old key in key-manager because migrated web app is considered as global app and the case would be found in decryption time (by web app launcher) who don't have permission to save in system db of key-manager with "/System" label. Permission policy of system db of key-manager should be changed OR migrated app should not be global app (it should be downloaded normal app) to save created key in key-manager. Change-Id: I9b8516184cce9f43b328e290c15127151e5c861e Signed-off-by: Kyungwook Tak <k.tak@samsung.com>
-rw-r--r--srcs/CMakeLists.txt27
-rw-r--r--srcs/decrypt_migrated_wgt.c185
-rw-r--r--srcs/decrypt_migrated_wgt.h31
-rw-r--r--srcs/web_app_enc.c13
4 files changed, 251 insertions, 5 deletions
diff --git a/srcs/CMakeLists.txt b/srcs/CMakeLists.txt
index b95531b..3de6d18 100644
--- a/srcs/CMakeLists.txt
+++ b/srcs/CMakeLists.txt
@@ -1,11 +1,30 @@
+# Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# @file CMakeLists.txt
+# @author
+# @brief
+#
+
################################################################################
# for libwebappenc.so
################################################################################
-
SET(WEB_APP_ENC_SOURCES
- ${CMAKE_CURRENT_SOURCE_DIR}/web_app_enc.c
- ${CMAKE_CURRENT_SOURCE_DIR}/key_handler.c
- ${CMAKE_CURRENT_SOURCE_DIR}/crypto_service.c
+ web_app_enc.c
+ key_handler.c
+ crypto_service.c
+ decrypt_migrated_wgt.c
)
INCLUDE_DIRECTORIES(
diff --git a/srcs/decrypt_migrated_wgt.c b/srcs/decrypt_migrated_wgt.c
new file mode 100644
index 0000000..d240fa4
--- /dev/null
+++ b/srcs/decrypt_migrated_wgt.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ *
+ *
+ * @file decrypt_migrated_wgt.c
+ * @author Kyungwook Tak (k.tak@samsung.com)
+ * @version 1.0
+ * @brief Restore old encryption key for removed secure-storage
+ */
+#include "decrypt_migrated_wgt.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#include <openssl/hmac.h>
+#include <openssl/sha.h>
+#include <openssl/evp.h>
+#include <openssl/crypto.h>
+
+#include "wae_log.h"
+#include "web_app_enc.h"
+
+#define DUK_LEN 16
+
+static int _get_old_duk(const char *pkg_id, unsigned char **pduk, size_t *pduk_len)
+{
+ unsigned char salt[32];
+
+ memset(salt, 0xFF, sizeof(salt));
+
+ unsigned char *duk = (unsigned char *)malloc(sizeof(unsigned char) * ((DUK_LEN * 2) + 1));
+ if (duk == NULL) {
+ WAE_SLOGE("Failed to allocate memory for old duk.");
+ return WAE_ERROR_MEMORY;
+ }
+
+ PKCS5_PBKDF2_HMAC_SHA1(pkg_id, strlen(pkg_id), salt, sizeof(salt), 1, (DUK_LEN * 2), duk);
+ duk[DUK_LEN * 2] = '\0';
+
+ *pduk = duk;
+ *pduk_len = DUK_LEN;
+
+ WAE_SLOGD("get old duk of length: %d", *pduk_len);
+
+ return WAE_ERROR_NONE;
+}
+
+static int _get_old_iv(const unsigned char *src, size_t src_len, unsigned char **piv, size_t *piv_len)
+{
+ unsigned char iv_buf[SHA_DIGEST_LENGTH] = {0, };
+ unsigned int iv_len = 0;
+
+ if (EVP_Digest(src, src_len, iv_buf, &iv_len, EVP_sha1(), NULL) != 1) {
+ WAE_SLOGE("Failed to EVP_Digest for getting old iv");
+ return WAE_ERROR_CRYPTO;
+ }
+
+ unsigned char *iv = (unsigned char *)malloc(sizeof(unsigned char) * sizeof(iv_buf));
+ if (iv == NULL)
+ return WAE_ERROR_MEMORY;
+
+ memcpy(iv, iv_buf, sizeof(iv_buf));
+
+ *piv = iv;
+ *piv_len = iv_len;
+
+ WAE_SLOGD("get old iv of length: %d", *piv_len);
+
+ return WAE_ERROR_NONE;
+}
+
+static int _decrypt(const unsigned char *key, size_t key_len,
+ const unsigned char *iv, size_t iv_len,
+ const unsigned char *data, size_t data_len,
+ unsigned char **pdecrypted, size_t *pdecrypted_len)
+{
+ if (key == NULL || iv == NULL || data == NULL || pdecrypted == NULL ||
+ pdecrypted_len == 0)
+ return WAE_ERROR_INVALID_PARAMETER;
+
+ if (key_len != 16 || iv_len < 16) {
+ WAE_SLOGE("Invalid key or iv size for decrypt by aes_128_cbc algorithm. "
+ "key should be 16 bytes and iv should be bigger than 16 bytes");
+ return WAE_ERROR_INVALID_PARAMETER;
+ }
+
+ const struct evp_cipher_st *algo = EVP_aes_128_cbc();
+
+ EVP_CIPHER_CTX ctx;
+
+ size_t tmp_len = (data_len / algo->block_size + 1) * algo->block_size;
+ int decrypted_len = 0;
+ int final_len = 0;
+
+ unsigned char *decrypted = (unsigned char *)calloc(tmp_len, 1);
+
+ if (decrypted == NULL)
+ return WAE_ERROR_MEMORY;
+
+ EVP_CIPHER_CTX_init(&ctx);
+
+ int ret = EVP_CipherInit(&ctx, algo, key, iv, 0);
+
+ if (ret != 1) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ }
+
+ ret = EVP_CIPHER_CTX_set_padding(&ctx, 1);
+
+ if (ret != 1) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ }
+
+ ret = EVP_CipherUpdate(&ctx, decrypted, &decrypted_len, data, data_len);
+
+ if (ret != 1) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ } else if (decrypted_len <= 0) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ }
+
+ ret = EVP_CipherFinal(&ctx, decrypted + decrypted_len, &final_len);
+
+ if (ret != 1) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ } else if (final_len <= 0) {
+ ret = WAE_ERROR_CRYPTO;
+ goto error;
+ }
+
+ *pdecrypted = decrypted;
+ *pdecrypted_len = decrypted_len + final_len;
+
+ ret = WAE_ERROR_NONE;
+
+error:
+ EVP_CIPHER_CTX_cleanup(&ctx);
+
+ return ret;
+}
+
+int decrypt_by_old_ss_algo(const char *pkg_id, const unsigned char *encrypted, size_t encrypted_len,
+ unsigned char **pdecrypted, size_t *pdecrypted_len)
+{
+ unsigned char *duk = NULL;
+ size_t duk_len = 0;
+ int ret = _get_old_duk(pkg_id, &duk, &duk_len);
+
+ if (ret != WAE_ERROR_NONE)
+ return ret;
+
+ unsigned char *iv = NULL;
+ size_t iv_len = 0;
+ ret = _get_old_iv(duk, duk_len, &iv, &iv_len);
+
+ if (ret != WAE_ERROR_NONE)
+ goto error;
+
+ ret = _decrypt(duk, duk_len, iv, iv_len, encrypted, encrypted_len, pdecrypted, pdecrypted_len);
+
+ WAE_SLOGI("decrypt with old ss algo success of pkg: %s", pkg_id);
+
+error:
+ free(duk);
+ free(iv);
+
+ return WAE_ERROR_NONE;
+}
diff --git a/srcs/decrypt_migrated_wgt.h b/srcs/decrypt_migrated_wgt.h
new file mode 100644
index 0000000..95f481e
--- /dev/null
+++ b/srcs/decrypt_migrated_wgt.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ *
+ *
+ * @file decrypt_migrated_wgt.h
+ * @author Kyungwook Tak (k.tak@samsung.com)
+ * @version 1.0
+ * @brief Restore old encryption key for removed secure-storage
+ */
+#ifndef __WAE_SS_KEY_GENERATOR_H
+#define __WAE_SS_KEY_GENERATOR_H
+
+#include <stddef.h>
+
+int decrypt_by_old_ss_algo(const char *pkg_id,
+ const unsigned char *encrypted, size_t encrypted_len,
+ unsigned char **pdecrypted, size_t *pdecrypted_len);
+
+#endif /* __WAE_SS_KEY_GENERATOR_H */
diff --git a/srcs/web_app_enc.c b/srcs/web_app_enc.c
index dd133d9..a5224ea 100644
--- a/srcs/web_app_enc.c
+++ b/srcs/web_app_enc.c
@@ -23,6 +23,7 @@
#include <stdlib.h>
+#include "decrypt_migrated_wgt.h"
#include "key_handler.h"
#include "crypto_service.h"
#include "wae_log.h"
@@ -70,8 +71,18 @@ int _wae_decrypt_downloaded_web_application(const char *pkg_id, wae_app_type_e a
size_t dek_len = -1;
int ret = get_app_dek(pkg_id, app_type, &dek, &dek_len);
- if (ret != WAE_ERROR_NONE)
+ if (app_type == WAE_DOWNLOADED_GLOBAL_APP && ret == WAE_ERROR_NO_KEY) {
+ WAE_SLOGI("app dek for decrypt downloaded app(%s) doesn't exist. This case would be "
+ "needed secure-storage data migration.", pkg_id);
+
+ ret = decrypt_by_old_ss_algo(pkg_id, data, data_len, pdecrypted_data, pdecrypted_data_len);
+ if (ret != WAE_ERROR_NONE)
+ goto error;
+ else
+ return WAE_ERROR_NONE;
+ } else if (ret != WAE_ERROR_NONE) {
goto error;
+ }
// decrypt
ret = decrypt_aes_cbc(dek, dek_len, data, data_len, pdecrypted_data, pdecrypted_data_len);