使用OpenSSL从内存而不是文件中读取证书文件

Question

我有一台服务器,可以使用OpenSSL监听HTTPS.为此,我必须提供使用证书.但是,当前实现使用要提供给OpenSSL API的文件名.

我希望从内存中读取证书信息,这样我就不必发送证书文件了.我试图谷歌,但我没有想出任何选择.

有可能吗？如果是这样,我如何使用OpenSSL从内存而不是文件中读取证书文件？

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编辑:以下内容从评论转移到问题.

// CURRENT
void start_server()
{
    const char *fileName = "cert_and_key.pem";
    set_server_ssl_file(fileName);
}
set_server_ssl_file(const char *fileName)
{
    //initialize context
    SSL_CTX_use_certificate_file(CTX, pem, SSL_FILETYPE_PEM); 
    SSL_CTX_use_PrivateKey_file(CTX, pem, SSL_FILETYPE_PEM);
}

//REQUIRED
void start_server()
{
    const char *cert = "--BEGIN CERTIFICATE--............";
    const char *key = "--BEGIN RSA PRIVATE KEY--.......";
    set_server_ssl_options(cert, key);
}
set_server_ssl_options(const char *cert, const char *key)
{
    //IMPLEMENTATION REQUIRED
}

Answer 1

以下代码为我完成了这项工作:

 
SSL_CTX *CTX;
X509 *cert = NULL;
RSA *rsa = NULL;
BIO *cbio, *kbio;
const char *cert_buffer = "";
const char *key_buffer = "";

cbio = BIO_new_mem_buf((void*)cert_buffer, -1);
cert = PEM_read_bio_X509(cbio, NULL, 0, NULL);
assert(cert != NULL);
SSL_CTX_use_certificate(CTX, cert);

kbio = BIO_new_mem_buf((void*)key_buffer, -1);
rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
assert(rsa != NULL);
SSL_CTX_use_RSAPrivateKey(CTX, rsa);

Answer 2

The other snippets will only load one certificate. The content of files like http://curl.haxx.se/ca/cacert.pem that contain a lot of different certificates need a new approach. This is adapted from openssl 1.0.1p (mostly openssl-1.0.1p\crypto\x509\by_file.c, char*buf contains the content of a*.pem file, ctx is a boost::asio::ssl::context), add error handling on your own:

BIO *cbio = BIO_new_mem_buf((void*)buf, (int)length);
X509_STORE  *cts = SSL_CTX_get_cert_store(ctx.native_handle());
if(!cts || !cbio)
   return false;
X509_INFO *itmp;
int i, count = 0, type = X509_FILETYPE_PEM;
STACK_OF(X509_INFO) *inf = PEM_X509_INFO_read_bio(cbio, NULL, NULL, NULL);

if (!inf)
{
    BIO_free(cbio);//cleanup
    return false;
}
//itterate over all entries from the pem file, add them to the x509_store one by one
for (i = 0; i < sk_X509_INFO_num(inf); i++) {
    itmp = sk_X509_INFO_value(inf, i);
    if (itmp->x509) {
          X509_STORE_add_cert(cts, itmp->x509);
          count++;
    }
    if (itmp->crl) {
          X509_STORE_add_crl(cts, itmp->crl);
          count++;
    }
}
sk_X509_INFO_pop_free(inf, X509_INFO_free); //cleanup
BIO_free(cbio);//cleanup

Answer 3

unsigned char *cert_data = (....);
int cert_len = (....);

X509 *cert = d2i_X509(NULL, &cert_data, cert_len);
SSL_CTX_use_certificate(ctx, cert);

unsigned char *pkey_data = /* ... */;
int pkey_len = /* ... */;

RSA *pkey = d2i_RSAPrivateKey(NULL, &pkey_data, pkey_len);
SSL_CTX_use_RSAPrivateKey(ctx, pkey);

不要忘记&之前cert_data和pkey_data- 并注意OpenSSL修改这些指针.