HibpPasswordProvider.cpp

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/*
 * BastionGuard™
 * Copyright (C) 2025–2026 Calogero Scarnà
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * BastionGuard™ is a trademark of Calogero Scarnà.
 * The BastionGuard™ name and branding are not licensed under the GPL.
 */
 
#include "HibpPasswordProvider.hpp"
#include "../net/HttpClient.hpp"
 
#include <openssl/sha.h>
#include <sstream>
#include <iomanip>
#include <map>
#include <cctype>
 
static std::string sha1HexUpper(const std::string& input)
{
    unsigned char hash[SHA_DIGEST_LENGTH];
    SHA1(reinterpret_cast<const unsigned char*>(input.data()),
         input.size(),
         hash);
 
    std::ostringstream oss;
    oss << std::uppercase << std::hex << std::setfill('0');
 
    for (int i = 0; i < SHA_DIGEST_LENGTH; ++i) {
        oss << std::setw(2) << static_cast<unsigned int>(hash[i]);
    }
 
    return oss.str();
}
 
static inline void rtrim_crlf(std::string& s)
{
    while (!s.empty() && (s.back() == '\r' || s.back() == '\n'))
        s.pop_back();
}
 
PasswordLeakResult
HibpPasswordProvider::checkPassword(const std::string& password)
{
    PasswordLeakResult result;
 
    if (password.empty())
        return result;
 
    const std::string hash = sha1HexUpper(password);
    if (hash.size() != 40)
        return result;
 
    const std::string prefix = hash.substr(0, 5);
    const std::string suffix = hash.substr(5); // 35 chars
 
    const std::string url =
        "https://api.pwnedpasswords.com/range/" + prefix;
 
    std::map<std::string, std::string> headers;
    headers["User-Agent"] = "BastionGuard/IdentityLeak";
    headers["Accept"] = "text/plain";
    headers["Add-Padding"] = "true";
 
    HttpResponse resp = HttpClient::get(url, headers, 15);
    if (resp.status != 200)
        return result;
 
    std::istringstream stream(resp.body);
    std::string line;
 
    while (std::getline(stream, line)) {
        rtrim_crlf(line);
 
        const auto pos = line.find(':');
        if (pos == std::string::npos)
            continue;
 
        const std::string_view lineSuffix(line.data(), pos);
        if (lineSuffix.size() != suffix.size())
            continue;
 
        if (lineSuffix == suffix) {
 
            std::string_view countPart(line.data() + pos + 1,
                                       line.size() - (pos + 1));
 
            unsigned long long count = 0;
            for (char ch : countPart) {
                if (!std::isdigit(static_cast<unsigned char>(ch)))
                    break;
                count = count * 10ULL + static_cast<unsigned long long>(ch - '0');
            }
 
            result.compromised = true;
            result.count = count;
            break;
        }
    }
 
    return result;
}