490 lines
14 KiB
C
490 lines
14 KiB
C
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/*
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* Copyright (c) 2007-2014, Cameron Rich
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*
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* All rights reserved.
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the axTLS project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Load certificates/keys into memory. These can be in many different formats.
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* PEM support and other formats can be processed here.
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*
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* The PEM private keys may be optionally encrypted with AES128 or AES256.
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* The encrypted PEM keys were generated with something like:
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*
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* openssl genrsa -aes128 -passout pass:abcd -out axTLS.key_aes128.pem 512
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "os_port.h"
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#include "ssl.h"
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static int do_obj(SSL_CTX *ssl_ctx, int obj_type,
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SSLObjLoader *ssl_obj, const char *password);
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#ifdef CONFIG_SSL_HAS_PEM
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static int ssl_obj_PEM_load(SSL_CTX *ssl_ctx, int obj_type,
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SSLObjLoader *ssl_obj, const char *password);
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#endif
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/*
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* Load a file into memory that is in binary DER (or ascii PEM) format.
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*/
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EXP_FUNC int STDCALL ssl_obj_load(SSL_CTX *ssl_ctx, int obj_type,
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const char *filename, const char *password)
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{
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#ifndef CONFIG_SSL_SKELETON_MODE
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static const char * const begin = "-----BEGIN";
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int ret = SSL_OK;
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SSLObjLoader *ssl_obj = NULL;
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if (filename == NULL)
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{
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ret = SSL_ERROR_INVALID_KEY;
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goto error;
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}
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ssl_obj = (SSLObjLoader *)calloc(1, sizeof(SSLObjLoader));
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ssl_obj->len = get_file(filename, &ssl_obj->buf);
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if (ssl_obj->len <= 0)
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{
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ret = SSL_ERROR_INVALID_KEY;
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goto error;
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}
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/* is the file a PEM file? */
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if (strstr((char *)ssl_obj->buf, begin) != NULL)
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{
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#ifdef CONFIG_SSL_HAS_PEM
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ret = ssl_obj_PEM_load(ssl_ctx, obj_type, ssl_obj, password);
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#else
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#ifdef CONFIG_SSL_FULL_MODE
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printf("%s", unsupported_str);
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#endif
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ret = SSL_ERROR_NOT_SUPPORTED;
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#endif
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}
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else
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ret = do_obj(ssl_ctx, obj_type, ssl_obj, password);
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error:
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ssl_obj_free(ssl_obj);
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return ret;
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#else
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#ifdef CONFIG_SSL_FULL_MODE
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printf("%s", unsupported_str);
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#endif
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return SSL_ERROR_NOT_SUPPORTED;
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#endif /* CONFIG_SSL_SKELETON_MODE */
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}
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/*
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* Transfer binary data into the object loader.
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*/
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EXP_FUNC int STDCALL ssl_obj_memory_load(SSL_CTX *ssl_ctx, int mem_type,
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const uint8_t *data, int len, const char *password)
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{
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int ret;
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SSLObjLoader *ssl_obj;
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ssl_obj = (SSLObjLoader *)calloc(1, sizeof(SSLObjLoader));
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ssl_obj->buf = (uint8_t *)malloc(len);
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memcpy(ssl_obj->buf, data, len);
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ssl_obj->len = len;
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ret = do_obj(ssl_ctx, mem_type, ssl_obj, password);
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ssl_obj_free(ssl_obj);
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return ret;
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}
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/*
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* Actually work out what we are doing
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*/
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static int do_obj(SSL_CTX *ssl_ctx, int obj_type,
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SSLObjLoader *ssl_obj, const char *password)
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{
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int ret = SSL_OK;
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switch (obj_type)
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{
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case SSL_OBJ_RSA_KEY:
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ret = add_private_key(ssl_ctx, ssl_obj);
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break;
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case SSL_OBJ_X509_CERT:
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ret = add_cert(ssl_ctx, ssl_obj->buf, ssl_obj->len);
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break;
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#ifdef CONFIG_SSL_CERT_VERIFICATION
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case SSL_OBJ_X509_CACERT:
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add_cert_auth(ssl_ctx, ssl_obj->buf, ssl_obj->len);
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break;
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#endif
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#ifdef CONFIG_SSL_USE_PKCS12
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case SSL_OBJ_PKCS8:
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ret = pkcs8_decode(ssl_ctx, ssl_obj, password);
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break;
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case SSL_OBJ_PKCS12:
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ret = pkcs12_decode(ssl_ctx, ssl_obj, password);
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break;
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#endif
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default:
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#ifdef CONFIG_SSL_FULL_MODE
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printf("%s", unsupported_str);
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#endif
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ret = SSL_ERROR_NOT_SUPPORTED;
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break;
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}
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return ret;
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}
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/*
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* Clean up our mess.
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*/
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void ssl_obj_free(SSLObjLoader *ssl_obj)
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{
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if (ssl_obj)
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{
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free(ssl_obj->buf);
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free(ssl_obj);
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}
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}
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/*
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* Support for PEM encoded keys/certificates.
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*/
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#ifdef CONFIG_SSL_HAS_PEM
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#define NUM_PEM_TYPES 4
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#define IV_SIZE 16
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#define IS_RSA_PRIVATE_KEY 0
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#define IS_ENCRYPTED_PRIVATE_KEY 1
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#define IS_PRIVATE_KEY 2
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#define IS_CERTIFICATE 3
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static const char * const begins[NUM_PEM_TYPES] =
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{
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"-----BEGIN RSA PRIVATE KEY-----",
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"-----BEGIN ENCRYPTED PRIVATE KEY-----",
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"-----BEGIN PRIVATE KEY-----",
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"-----BEGIN CERTIFICATE-----",
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};
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static const char * const ends[NUM_PEM_TYPES] =
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{
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"-----END RSA PRIVATE KEY-----",
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"-----END ENCRYPTED PRIVATE KEY-----",
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"-----END PRIVATE KEY-----",
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"-----END CERTIFICATE-----",
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};
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static const char * const aes_str[2] =
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{
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"DEK-Info: AES-128-CBC,",
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"DEK-Info: AES-256-CBC,"
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};
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/**
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* Take a base64 blob of data and decrypt it (using AES) into its
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* proper ASN.1 form.
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*/
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static int pem_decrypt(const char *where, const char *end,
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const char *password, SSLObjLoader *ssl_obj)
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{
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int ret = -1;
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int is_aes_256 = 0;
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char *start = NULL;
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uint8_t iv[IV_SIZE];
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int i, pem_size;
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MD5_CTX md5_ctx;
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AES_CTX aes_ctx;
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uint8_t key[32]; /* AES256 size */
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if (password == NULL || strlen(password) == 0)
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{
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#ifdef CONFIG_SSL_FULL_MODE
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printf("Error: Need a password for this PEM file\n");
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#endif
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goto error;
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}
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if ((start = strstr((const char *)where, aes_str[0]))) /* AES128? */
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{
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start += strlen(aes_str[0]);
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}
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else if ((start = strstr((const char *)where, aes_str[1]))) /* AES256? */
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{
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is_aes_256 = 1;
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start += strlen(aes_str[1]);
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}
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else
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{
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#ifdef CONFIG_SSL_FULL_MODE
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printf("Error: Unsupported password cipher\n");
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#endif
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goto error;
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}
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/* convert from hex to binary - assumes uppercase hex */
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for (i = 0; i < IV_SIZE; i++)
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{
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char c = *start++ - '0';
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iv[i] = (c > 9 ? c + '0' - 'A' + 10 : c) << 4;
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c = *start++ - '0';
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iv[i] += (c > 9 ? c + '0' - 'A' + 10 : c);
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}
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while (*start == '\r' || *start == '\n')
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start++;
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/* turn base64 into binary */
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pem_size = (int)(end-start);
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if (base64_decode(start, pem_size, ssl_obj->buf, &ssl_obj->len) != 0)
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goto error;
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/* work out the key */
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MD5_Init(&md5_ctx);
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MD5_Update(&md5_ctx, (const uint8_t *)password, strlen(password));
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MD5_Update(&md5_ctx, iv, SALT_SIZE);
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MD5_Final(key, &md5_ctx);
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if (is_aes_256)
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{
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MD5_Init(&md5_ctx);
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MD5_Update(&md5_ctx, key, MD5_SIZE);
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MD5_Update(&md5_ctx, (const uint8_t *)password, strlen(password));
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MD5_Update(&md5_ctx, iv, SALT_SIZE);
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MD5_Final(&key[MD5_SIZE], &md5_ctx);
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}
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/* decrypt using the key/iv */
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AES_set_key(&aes_ctx, key, iv, is_aes_256 ? AES_MODE_256 : AES_MODE_128);
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AES_convert_key(&aes_ctx);
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AES_cbc_decrypt(&aes_ctx, ssl_obj->buf, ssl_obj->buf, ssl_obj->len);
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ret = 0;
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error:
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return ret;
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}
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/**
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* Take a base64 blob of data and turn it into its proper ASN.1 form.
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*/
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static int new_pem_obj(SSL_CTX *ssl_ctx, int is_cacert, char *where,
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int remain, const char *password)
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{
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int ret = SSL_ERROR_BAD_CERTIFICATE;
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SSLObjLoader *ssl_obj = NULL;
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while (remain > 0)
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{
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int i, pem_size, obj_type;
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char *start = NULL, *end = NULL;
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for (i = 0; i < NUM_PEM_TYPES; i++)
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{
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if ((start = strstr(where, begins[i])) &&
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(end = strstr(where, ends[i])))
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{
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remain -= (int)(end-where);
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start += strlen(begins[i]);
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pem_size = (int)(end-start);
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ssl_obj = (SSLObjLoader *)calloc(1, sizeof(SSLObjLoader));
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/* 4/3 bigger than what we need but so what */
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ssl_obj->buf = (uint8_t *)calloc(1, pem_size);
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ssl_obj->len = pem_size;
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if (i == IS_RSA_PRIVATE_KEY &&
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strstr(start, "Proc-Type:") &&
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strstr(start, "4,ENCRYPTED"))
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{
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/* check for encrypted PEM file */
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if (pem_decrypt(start, end, password, ssl_obj) < 0)
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{
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ret = SSL_ERROR_BAD_CERTIFICATE;
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goto error;
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}
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}
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else
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{
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ssl_obj->len = pem_size;
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if (base64_decode(start, pem_size,
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ssl_obj->buf, &ssl_obj->len) != 0)
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{
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ret = SSL_ERROR_BAD_CERTIFICATE;
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goto error;
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}
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}
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switch (i)
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{
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case IS_RSA_PRIVATE_KEY:
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obj_type = SSL_OBJ_RSA_KEY;
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break;
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case IS_ENCRYPTED_PRIVATE_KEY:
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case IS_PRIVATE_KEY:
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obj_type = SSL_OBJ_PKCS8;
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break;
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case IS_CERTIFICATE:
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obj_type = is_cacert ?
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SSL_OBJ_X509_CACERT : SSL_OBJ_X509_CERT;
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break;
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default:
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ret = SSL_ERROR_BAD_CERTIFICATE;
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goto error;
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}
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/* In a format we can now understand - so process it */
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if ((ret = do_obj(ssl_ctx, obj_type, ssl_obj, password)))
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goto error;
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end += strlen(ends[i]);
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remain -= strlen(ends[i]);
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while (remain > 0 && (*end == '\r' || *end == '\n'))
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{
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end++;
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remain--;
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}
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||
|
|
where = end;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ssl_obj_free(ssl_obj);
|
||
|
|
ssl_obj = NULL;
|
||
|
|
if (start == NULL)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
error:
|
||
|
|
ssl_obj_free(ssl_obj);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Load a file into memory that is in ASCII PEM format.
|
||
|
|
*/
|
||
|
|
static int ssl_obj_PEM_load(SSL_CTX *ssl_ctx, int obj_type,
|
||
|
|
SSLObjLoader *ssl_obj, const char *password)
|
||
|
|
{
|
||
|
|
char *start;
|
||
|
|
|
||
|
|
/* add a null terminator */
|
||
|
|
ssl_obj->len++;
|
||
|
|
ssl_obj->buf = (uint8_t *)realloc(ssl_obj->buf, ssl_obj->len);
|
||
|
|
ssl_obj->buf[ssl_obj->len-1] = 0;
|
||
|
|
start = (char *)ssl_obj->buf;
|
||
|
|
return new_pem_obj(ssl_ctx, obj_type == SSL_OBJ_X509_CACERT,
|
||
|
|
start, ssl_obj->len, password);
|
||
|
|
}
|
||
|
|
#endif /* CONFIG_SSL_HAS_PEM */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Load the key/certificates in memory depending on compile-time and user
|
||
|
|
* options.
|
||
|
|
*/
|
||
|
|
int load_key_certs(SSL_CTX *ssl_ctx)
|
||
|
|
{
|
||
|
|
int ret = SSL_OK;
|
||
|
|
uint32_t options = ssl_ctx->options;
|
||
|
|
#ifdef CONFIG_SSL_GENERATE_X509_CERT
|
||
|
|
uint8_t *cert_data = NULL;
|
||
|
|
int cert_size;
|
||
|
|
static const char *dn[] =
|
||
|
|
{
|
||
|
|
CONFIG_SSL_X509_COMMON_NAME,
|
||
|
|
CONFIG_SSL_X509_ORGANIZATION_NAME,
|
||
|
|
CONFIG_SSL_X509_ORGANIZATION_UNIT_NAME
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* do the private key first */
|
||
|
|
if (strlen(CONFIG_SSL_PRIVATE_KEY_LOCATION) > 0)
|
||
|
|
{
|
||
|
|
if ((ret = ssl_obj_load(ssl_ctx, SSL_OBJ_RSA_KEY,
|
||
|
|
CONFIG_SSL_PRIVATE_KEY_LOCATION,
|
||
|
|
CONFIG_SSL_PRIVATE_KEY_PASSWORD)) < 0)
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
else if (!(options & SSL_NO_DEFAULT_KEY))
|
||
|
|
{
|
||
|
|
#if defined(CONFIG_SSL_USE_DEFAULT_KEY) || defined(CONFIG_SSL_SKELETON_MODE)
|
||
|
|
static const /* saves a few more bytes */
|
||
|
|
#include "private_key.h"
|
||
|
|
|
||
|
|
ssl_obj_memory_load(ssl_ctx, SSL_OBJ_RSA_KEY, default_private_key,
|
||
|
|
default_private_key_len, NULL);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* now load the certificate */
|
||
|
|
#ifdef CONFIG_SSL_GENERATE_X509_CERT
|
||
|
|
if ((cert_size = ssl_x509_create(ssl_ctx, 0, dn, &cert_data)) < 0)
|
||
|
|
{
|
||
|
|
ret = cert_size;
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
ssl_obj_memory_load(ssl_ctx, SSL_OBJ_X509_CERT, cert_data, cert_size, NULL);
|
||
|
|
free(cert_data);
|
||
|
|
#else
|
||
|
|
if (strlen(CONFIG_SSL_X509_CERT_LOCATION))
|
||
|
|
{
|
||
|
|
if ((ret = ssl_obj_load(ssl_ctx, SSL_OBJ_X509_CERT,
|
||
|
|
CONFIG_SSL_X509_CERT_LOCATION, NULL)) < 0)
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
else if (!(options & SSL_NO_DEFAULT_KEY))
|
||
|
|
{
|
||
|
|
#if defined(CONFIG_SSL_USE_DEFAULT_KEY) || defined(CONFIG_SSL_SKELETON_MODE)
|
||
|
|
static const /* saves a few bytes and RAM */
|
||
|
|
#include "cert.h"
|
||
|
|
ssl_obj_memory_load(ssl_ctx, SSL_OBJ_X509_CERT,
|
||
|
|
default_certificate, default_certificate_len, NULL);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
error:
|
||
|
|
#ifdef CONFIG_SSL_FULL_MODE
|
||
|
|
if (ret)
|
||
|
|
{
|
||
|
|
printf("Error: Certificate or key not loaded\n");
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
}
|