summaryrefslogtreecommitdiffstats
path: root/ipcipher.cc
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--ipcipher.cc187
1 files changed, 187 insertions, 0 deletions
diff --git a/ipcipher.cc b/ipcipher.cc
new file mode 100644
index 0000000..1d64cc9
--- /dev/null
+++ b/ipcipher.cc
@@ -0,0 +1,187 @@
+#include "ipcipher.hh"
+#include "ext/ipcrypt/ipcrypt.h"
+#include <cassert>
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+
+#ifdef HAVE_IPCIPHER
+/*
+int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
+ const unsigned char *salt, int saltlen, int iter,
+ int keylen, unsigned char *out);
+*/
+std::string makeIPCipherKey(const std::string& password)
+{
+ static const char salt[] = "ipcipheripcipher";
+ unsigned char out[16];
+
+ PKCS5_PBKDF2_HMAC_SHA1(password.c_str(), password.size(), (const unsigned char*)salt, sizeof(salt) - 1, 50000, sizeof(out), out);
+
+ return std::string((const char*)out, (const char*)out + sizeof(out));
+}
+
+static ComboAddress encryptCA4(const ComboAddress& ca, const std::string& key)
+{
+ if (key.size() != 16) {
+ throw std::runtime_error("Need 128 bits of key for ipcrypt");
+ }
+
+ ComboAddress ret = ca;
+
+ // always returns 0, has no failure mode
+ ipcrypt_encrypt((unsigned char*)&ret.sin4.sin_addr.s_addr,
+ (const unsigned char*)&ca.sin4.sin_addr.s_addr,
+ (const unsigned char*)key.c_str());
+
+ return ret;
+}
+
+static ComboAddress decryptCA4(const ComboAddress& ca, const std::string& key)
+{
+ if (key.size() != 16) {
+ throw std::runtime_error("Need 128 bits of key for ipcrypt");
+ }
+
+ ComboAddress ret = ca;
+
+ // always returns 0, has no failure mode
+ ipcrypt_decrypt((unsigned char*)&ret.sin4.sin_addr.s_addr,
+ (const unsigned char*)&ca.sin4.sin_addr.s_addr,
+ (const unsigned char*)key.c_str());
+
+ return ret;
+}
+
+static ComboAddress encryptCA6(const ComboAddress& address, const std::string& key)
+{
+ if (key.size() != 16) {
+ throw std::runtime_error("Need 128 bits of key for ipcrypt");
+ }
+
+ ComboAddress ret = address;
+
+#if OPENSSL_VERSION_MAJOR >= 3
+ auto ctx = std::unique_ptr<EVP_CIPHER_CTX, decltype(&EVP_CIPHER_CTX_free)>(EVP_CIPHER_CTX_new(), &EVP_CIPHER_CTX_free);
+ if (ctx == nullptr) {
+ throw pdns::OpenSSL::error("encryptCA6: Could not initialize cipher context");
+ }
+
+ auto aes128cbc = std::unique_ptr<EVP_CIPHER, decltype(&EVP_CIPHER_free)>(EVP_CIPHER_fetch(nullptr, "AES-128-CBC", nullptr), &EVP_CIPHER_free);
+
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ if (EVP_EncryptInit(ctx.get(), aes128cbc.get(), reinterpret_cast<const unsigned char*>(key.c_str()), nullptr) == 0) {
+ throw pdns::OpenSSL::error("encryptCA6: Could not initialize encryption algorithm");
+ }
+
+ // Disable padding
+ const auto inSize = sizeof(address.sin6.sin6_addr.s6_addr);
+ static_assert(inSize == 16, "We disable padding and so we must assume a data size of 16 bytes");
+ const auto blockSize = EVP_CIPHER_get_block_size(aes128cbc.get());
+ assert(blockSize == 16);
+ EVP_CIPHER_CTX_set_padding(ctx.get(), 0);
+
+ int updateLen = 0;
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ const auto* input = reinterpret_cast<const unsigned char*>(&address.sin6.sin6_addr.s6_addr);
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ auto* output = reinterpret_cast<unsigned char*>(&ret.sin6.sin6_addr.s6_addr);
+ if (EVP_EncryptUpdate(ctx.get(), output, &updateLen, input, static_cast<int>(inSize)) == 0) {
+ throw pdns::OpenSSL::error("encryptCA6: Could not encrypt address");
+ }
+
+ int finalLen = 0;
+ if (EVP_EncryptFinal_ex(ctx.get(), output + updateLen, &finalLen) == 0) {
+ throw pdns::OpenSSL::error("encryptCA6: Could not finalize address encryption");
+ }
+
+ assert(updateLen + finalLen == inSize);
+#else
+ AES_KEY wctx;
+ AES_set_encrypt_key((const unsigned char*)key.c_str(), 128, &wctx);
+ AES_encrypt((const unsigned char*)&address.sin6.sin6_addr.s6_addr,
+ (unsigned char*)&ret.sin6.sin6_addr.s6_addr, &wctx);
+#endif
+
+ return ret;
+}
+
+static ComboAddress decryptCA6(const ComboAddress& address, const std::string& key)
+{
+ if (key.size() != 16) {
+ throw std::runtime_error("Need 128 bits of key for ipcrypt");
+ }
+
+ ComboAddress ret = address;
+
+#if OPENSSL_VERSION_MAJOR >= 3
+ auto ctx = std::unique_ptr<EVP_CIPHER_CTX, decltype(&EVP_CIPHER_CTX_free)>(EVP_CIPHER_CTX_new(), &EVP_CIPHER_CTX_free);
+ if (ctx == nullptr) {
+ throw pdns::OpenSSL::error("decryptCA6: Could not initialize cipher context");
+ }
+
+ auto aes128cbc = std::unique_ptr<EVP_CIPHER, decltype(&EVP_CIPHER_free)>(EVP_CIPHER_fetch(nullptr, "AES-128-CBC", nullptr), &EVP_CIPHER_free);
+
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ if (EVP_DecryptInit(ctx.get(), aes128cbc.get(), reinterpret_cast<const unsigned char*>(key.c_str()), nullptr) == 0) {
+ throw pdns::OpenSSL::error("decryptCA6: Could not initialize decryption algorithm");
+ }
+
+ // Disable padding
+ const auto inSize = sizeof(address.sin6.sin6_addr.s6_addr);
+ static_assert(inSize == 16, "We disable padding and so we must assume a data size of 16 bytes");
+ const auto blockSize = EVP_CIPHER_get_block_size(aes128cbc.get());
+ assert(blockSize == 16);
+ EVP_CIPHER_CTX_set_padding(ctx.get(), 0);
+
+ int updateLen = 0;
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ const auto* input = reinterpret_cast<const unsigned char*>(&address.sin6.sin6_addr.s6_addr);
+ // NOLINTNEXTLINE(*-cast): Using OpenSSL C APIs.
+ auto* output = reinterpret_cast<unsigned char*>(&ret.sin6.sin6_addr.s6_addr);
+ if (EVP_DecryptUpdate(ctx.get(), output, &updateLen, input, static_cast<int>(inSize)) == 0) {
+ throw pdns::OpenSSL::error("decryptCA6: Could not decrypt address");
+ }
+
+ int finalLen = 0;
+ if (EVP_DecryptFinal_ex(ctx.get(), output + updateLen, &finalLen) == 0) {
+ throw pdns::OpenSSL::error("decryptCA6: Could not finalize address decryption");
+ }
+
+ assert(updateLen + finalLen == inSize);
+#else
+ AES_KEY wctx;
+ AES_set_decrypt_key((const unsigned char*)key.c_str(), 128, &wctx);
+ AES_decrypt((const unsigned char*)&address.sin6.sin6_addr.s6_addr,
+ (unsigned char*)&ret.sin6.sin6_addr.s6_addr, &wctx);
+#endif
+
+ return ret;
+}
+
+ComboAddress encryptCA(const ComboAddress& ca, const std::string& key)
+{
+ if (ca.sin4.sin_family == AF_INET) {
+ return encryptCA4(ca, key);
+ }
+
+ if (ca.sin4.sin_family == AF_INET6) {
+ return encryptCA6(ca, key);
+ }
+
+ throw std::runtime_error("ipcrypt can't encrypt non-IP addresses");
+}
+
+ComboAddress decryptCA(const ComboAddress& ca, const std::string& key)
+{
+ if (ca.sin4.sin_family == AF_INET) {
+ return decryptCA4(ca, key);
+ }
+
+ if (ca.sin4.sin_family == AF_INET6) {
+ return decryptCA6(ca, key);
+ }
+
+ throw std::runtime_error("ipcrypt can't decrypt non-IP addresses");
+}
+
+#endif /* HAVE_IPCIPHER */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 04:55:06 +0000