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/* Copyright (c) 2021, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <stdio.h>
#include <limits>
#include <vector>
#include <openssl/bytestring.h>
#include <openssl/hpke.h>
#include <openssl/span.h>
#include <openssl/ssl.h>
#include "internal.h"
static const struct argument kArguments[] = {
{
"-out-ech-config-list",
kRequiredArgument,
"The path where the ECHConfigList should be written.",
},
{
"-out-ech-config",
kRequiredArgument,
"The path where the ECHConfig should be written.",
},
{
"-out-private-key",
kRequiredArgument,
"The path where the private key should be written.",
},
{
"-public-name",
kRequiredArgument,
"The public name for the new ECHConfig.",
},
{
"-config-id",
kRequiredArgument,
"The config ID for the new ECHConfig, from 0 to 255. Config IDs may be "
"reused, but should be unique among active configs on a server for "
"performance.",
},
{
"-max-name-length",
kOptionalArgument,
"The length of the longest name in the anonymity set, to guide client "
"padding.",
},
{
"",
kOptionalArgument,
"",
},
};
bool GenerateECH(const std::vector<std::string> &args) {
std::map<std::string, std::string> args_map;
if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
PrintUsage(kArguments);
return false;
}
unsigned config_id;
if (!GetUnsigned(&config_id, "-config-id", 0, args_map) ||
config_id > std::numeric_limits<uint8_t>::max()) {
fprintf(stderr, "Error parsing -config-id argument\n");
return false;
}
unsigned max_name_len = 0;
if (args_map.count("-max-name-length") != 0 &&
!GetUnsigned(&max_name_len, "-max-name-length", 0, args_map)) {
fprintf(stderr, "Error parsing -max-name-length argument\n");
return false;
}
bssl::ScopedEVP_HPKE_KEY key;
uint8_t public_key[EVP_HPKE_MAX_PUBLIC_KEY_LENGTH];
uint8_t private_key[EVP_HPKE_MAX_PRIVATE_KEY_LENGTH];
size_t public_key_len, private_key_len;
if (!EVP_HPKE_KEY_generate(key.get(), EVP_hpke_x25519_hkdf_sha256()) ||
!EVP_HPKE_KEY_public_key(key.get(), public_key, &public_key_len,
sizeof(public_key)) ||
!EVP_HPKE_KEY_private_key(key.get(), private_key, &private_key_len,
sizeof(private_key))) {
fprintf(stderr, "Failed to generate the HPKE keypair\n");
return false;
}
uint8_t *ech_config;
size_t ech_config_len;
if (!SSL_marshal_ech_config(
&ech_config, &ech_config_len, static_cast<uint8_t>(config_id),
key.get(), args_map["-public-name"].c_str(), size_t{max_name_len})) {
fprintf(stderr, "Failed to serialize the ECHConfigList\n");
return false;
}
bssl::UniquePtr<uint8_t> free_ech_config(ech_config);
bssl::ScopedCBB cbb;
CBB body;
if (!CBB_init(cbb.get(), ech_config_len + sizeof(uint16_t)) ||
!CBB_add_u16_length_prefixed(cbb.get(), &body) ||
!CBB_add_bytes(&body, ech_config, ech_config_len) ||
!CBB_flush(cbb.get())) {
fprintf(stderr, "Failed to serialize the ECHConfigList\n");
return false;
}
if (!WriteToFile(
args_map["-out-ech-config-list"],
bssl::MakeConstSpan(CBB_data(cbb.get()), CBB_len(cbb.get()))) ||
!WriteToFile(args_map["-out-ech-config"],
bssl::MakeConstSpan(ech_config, ech_config_len)) ||
!WriteToFile(args_map["-out-private-key"],
bssl::MakeConstSpan(private_key, private_key_len))) {
fprintf(stderr, "Failed to write ECHConfig or private key to file\n");
return false;
}
return true;
}
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