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/*
* Copyright (c) 2013-2025, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <string.h>
#include <openssl/ssl.h>
#include "Crypto.h"
#include "FS.h"
#include "Log.h"
#include "Family.h"
#include "Config.h"
namespace i2p
{
namespace data
{
Families::Families ()
{
}
Families::~Families ()
{
for (auto it : m_SigningKeys)
if (it.second.first) EVP_PKEY_free (it.second.first);
}
void Families::LoadCertificate (const std::string& filename)
{
SSL_CTX * ctx = SSL_CTX_new (TLS_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 * cn = strstr (name, "CN=");
if (cn)
{
cn += 3;
char * family = strstr (cn, ".family");
if (family) family[0] = 0;
auto pkey = X509_get_pubkey (cert);
if (pkey)
{
int curve = 0;
#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
char groupName[20];
if (EVP_PKEY_get_group_name(pkey, groupName, sizeof(groupName), NULL) == 1)
curve = OBJ_txt2nid (groupName);
else
curve = -1;
#endif
if (!curve || curve == NID_X9_62_prime256v1)
{
if (!m_SigningKeys.emplace (cn, std::make_pair(pkey, (int)m_SigningKeys.size () + 1)).second)
{
EVP_PKEY_free (pkey);
LogPrint (eLogError, "Family: Duplicated family name ", cn);
}
}
else
LogPrint (eLogWarning, "Family: elliptic curve ", curve, " is not supported");
}
}
}
SSL_free (ssl);
}
else
LogPrint (eLogError, "Family: Can't open certificate file ", filename);
SSL_CTX_free (ctx);
}
void Families::LoadCertificates ()
{
std::string certDir = i2p::fs::GetCertsDir() + i2p::fs::dirSep + "family";
std::vector<std::string> files;
int numCertificates = 0;
if (!i2p::fs::ReadDir(certDir, files)) {
LogPrint(eLogWarning, "Family: Can't load family certificates from ", certDir);
return;
}
for (const std::string & file : files) {
if (file.compare(file.size() - 4, 4, ".crt") != 0) {
LogPrint(eLogWarning, "Family: ignoring file ", file);
continue;
}
LoadCertificate (file);
numCertificates++;
}
LogPrint (eLogInfo, "Family: ", numCertificates, " certificates loaded");
}
bool Families::VerifyFamily (const std::string& family, const IdentHash& ident,
std::string_view signature, const char * key) const
{
uint8_t buf[100], signatureBuf[64];
size_t len = family.length ();
if (len + 32 > 100)
{
LogPrint (eLogError, "Family: ", family, " is too long");
return false;
}
auto it = m_SigningKeys.find (family);
if (it != m_SigningKeys.end () && it->second.first)
{
memcpy (buf, family.c_str (), len);
memcpy (buf + len, (const uint8_t *)ident, 32);
len += 32;
auto signatureBufLen = Base64ToByteStream (signature, signatureBuf, 64);
if (signatureBufLen == 64)
{
ECDSA_SIG * sig = ECDSA_SIG_new();
ECDSA_SIG_set0 (sig, BN_bin2bn (signatureBuf, 32, NULL), BN_bin2bn (signatureBuf + 32, 32, NULL));
uint8_t sign[72];
uint8_t * s = sign;
auto l = i2d_ECDSA_SIG (sig, &s);
ECDSA_SIG_free(sig);
EVP_MD_CTX * ctx = EVP_MD_CTX_create ();
EVP_DigestVerifyInit (ctx, NULL, EVP_sha256(), NULL, it->second.first);
auto ret = EVP_DigestVerify (ctx, sign, l, buf, len) == 1;
EVP_MD_CTX_destroy (ctx);
return ret;
}
}
// TODO: process key
return true;
}
FamilyID Families::GetFamilyID (const std::string& family) const
{
auto it = m_SigningKeys.find (family);
if (it != m_SigningKeys.end ())
return it->second.second;
return 0;
}
std::string CreateFamilySignature (const std::string& family, const IdentHash& ident)
{
auto filename = i2p::fs::DataDirPath("family", (family + ".key"));
std::string sig;
SSL_CTX * ctx = SSL_CTX_new (TLS_method ());
int ret = SSL_CTX_use_PrivateKey_file (ctx, filename.c_str (), SSL_FILETYPE_PEM);
if (ret)
{
SSL * ssl = SSL_new (ctx);
EVP_PKEY * pkey = SSL_get_privatekey (ssl);
int curve = 0;
#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
char groupName[20];
if (EVP_PKEY_get_group_name(pkey, groupName, sizeof(groupName), NULL) == 1)
curve = OBJ_txt2nid (groupName);
else
curve = -1;
#endif
if (!curve || curve == NID_X9_62_prime256v1)
{
uint8_t buf[100], sign[72], signature[64];
size_t len = family.length ();
memcpy (buf, family.c_str (), len);
memcpy (buf + len, (const uint8_t *)ident, 32);
len += 32;
size_t l = 72;
EVP_MD_CTX * mdctx = EVP_MD_CTX_create ();
EVP_DigestSignInit (mdctx, NULL, EVP_sha256(), NULL, pkey);
EVP_DigestSign (mdctx, sign, &l, buf, len);
EVP_MD_CTX_destroy (mdctx);
const uint8_t * s1 = sign;
ECDSA_SIG * sig1 = d2i_ECDSA_SIG (NULL, &s1, l);
const BIGNUM * r, * s;
ECDSA_SIG_get0 (sig1, &r, &s);
i2p::crypto::bn2buf (r, signature, 32);
i2p::crypto::bn2buf (s, signature + 32, 32);
ECDSA_SIG_free(sig1);
sig = ByteStreamToBase64 (signature, 64);
}
else
LogPrint (eLogWarning, "Family: elliptic curve ", curve, " is not supported");
SSL_free (ssl);
}
else
LogPrint (eLogError, "Family: Can't open keys file: ", filename);
SSL_CTX_free (ctx);
return sig;
}
}
}
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