i2pd/Family.cpp
2016-02-19 16:37:41 -05:00

123 lines
3.3 KiB
C++

#include <string.h>
#include "util.h"
#include <openssl/evp.h>
#include <openssl/ssl.h>
#include "Log.h"
#include "Crypto.h"
#include "Family.h"
namespace i2p
{
namespace data
{
Families::Families ()
{
}
Families::~Families ()
{
}
void Families::LoadCertificate (const std::string& filename)
{
SSL_CTX * ctx = SSL_CTX_new (TLSv1_method ());
int ret = SSL_CTX_use_certificate_file (ctx, filename.c_str (), SSL_FILETYPE_PEM);
if (ret)
{
SSL * ssl = SSL_new (ctx);
X509 * cert = SSL_get_certificate (ssl);
if (cert)
{
std::shared_ptr<i2p::crypto::Verifier> verifier;
// extract issuer name
char name[100];
X509_NAME_oneline (X509_get_issuer_name(cert), name, 100);
char * family = strstr (name, ".family");
if (family) family[0] = 0;
auto pkey = X509_get_pubkey (cert);
int keyType = EVP_PKEY_type(pkey->type);
switch (keyType)
{
case EVP_PKEY_DSA:
// TODO:
break;
case EVP_PKEY_EC:
{
EC_KEY * ecKey = EVP_PKEY_get1_EC_KEY (pkey);
if (ecKey)
{
auto group = EC_KEY_get0_group (ecKey);
if (group)
{
int curve = EC_GROUP_get_curve_name (group);
if (curve == NID_X9_62_prime256v1)
{
uint8_t signingKey[64];
BIGNUM * x = BN_new(), * y = BN_new();
EC_POINT_get_affine_coordinates_GFp (group,
EC_KEY_get0_public_key (ecKey), x, y, NULL);
i2p::crypto::bn2buf (x, signingKey, 32);
i2p::crypto::bn2buf (y, signingKey + 32, 32);
BN_free (x); BN_free (y);
verifier = std::make_shared<i2p::crypto::ECDSAP256Verifier>(signingKey);
}
else
LogPrint (eLogWarning, "Family: elliptic curve ", curve, " is not supported");
}
EC_KEY_free (ecKey);
}
break;
}
default:
LogPrint (eLogWarning, "Family: Certificate key type ", keyType, " is not supported");
}
EVP_PKEY_free (pkey);
if (verifier)
m_SigningKeys[name] = verifier;
}
SSL_free (ssl);
}
else
LogPrint (eLogError, "Family: Can't open certificate file ", filename);
SSL_CTX_free (ctx);
}
void Families::LoadCertificates ()
{
boost::filesystem::path familyDir = i2p::util::filesystem::GetCertificatesDir() / "family";
if (!boost::filesystem::exists (familyDir)) return;
int numCertificates = 0;
boost::filesystem::directory_iterator end; // empty
for (boost::filesystem::directory_iterator it (familyDir); it != end; ++it)
{
if (boost::filesystem::is_regular_file (it->status()) && it->path ().extension () == ".crt")
{
LoadCertificate (it->path ().string ());
numCertificates++;
}
}
if (numCertificates > 0)
LogPrint (eLogInfo, "Family: ", numCertificates, " certificates loaded");
}
bool Families::VerifyFamily (const std::string& family, const IdentHash& ident,
const char * signature, const char * key)
{
uint8_t buf[50], signatureBuf[64];
size_t len = family.length (), signatureLen = strlen (signature);
memcpy (buf, family.c_str (), len);
memcpy (buf + len, (const uint8_t *)ident, 32);
len += 32;
Base64ToByteStream (signature, signatureLen, signatureBuf, 64);
auto it = m_SigningKeys.find (family);
if (it != m_SigningKeys.end ())
return it->second->Verify (buf, len, signatureBuf);
// TODO: process key
return true;
}
}
}