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267 lines
10 KiB
C#
267 lines
10 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (c) 2007-2024 ShareX Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using Newtonsoft.Json;
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using ShareX.HelpersLib;
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace ShareX.UploadersLib.FileUploaders
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{
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public class Vault_oooFileUploaderService : FileUploaderService
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{
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public override FileDestination EnumValue { get; } = FileDestination.Vault_ooo;
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public override bool CheckConfig(UploadersConfig config)
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{
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return true;
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}
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public override GenericUploader CreateUploader(UploadersConfig config, TaskReferenceHelper taskInfo)
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{
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return new Vault_ooo();
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}
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}
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public sealed class Vault_ooo : FileUploader
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{
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private const string APIURL = "https://vault.ooo";
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private const int PBKDF2_ITERATIONS = 10000;
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private const int AES_KEY_SIZE = 256; // Bits
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private const int AES_BLOCK_SIZE = 128; // Bits
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private const int BYTE_CHUNK_SIZE = 256 * 1024 * 381; // Copied from web client (99 MB)
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private static readonly DateTime ORIGIN_TIME = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
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public override UploadResult Upload(Stream stream, string fileName)
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{
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#region Calculating sizes
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long fileSize = stream.Length;
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int chunks = (int)Math.Ceiling((double)fileSize / BYTE_CHUNK_SIZE);
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long fullUploadSize = 16; // 16 bytes header
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List<long> uploadSizes = new List<long>();
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uploadSizes.Add(0);
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LoopStartEnd((chunkStart, chunkEnd, i) =>
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{
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int chunkLength = chunkEnd - chunkStart;
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fullUploadSize += chunkLength + 16 - (chunkLength % 16);
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uploadSizes.Add(fullUploadSize);
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}, chunks, fileSize);
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#endregion
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string randomKey = GenerateRandomKey();
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byte[] randomKeyBytes = Encoding.UTF8.GetBytes(randomKey);
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Vault_oooCryptoData cryptoData = DeriveCryptoData(randomKeyBytes);
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#region Building filename
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byte[] fileNameBytes = Encoding.UTF8.GetBytes(fileName);
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string encryptedFileName;
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using (MemoryStream ms = new MemoryStream()) // Encrypting file name
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{
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ms.Write(cryptoData.Salt, 0, cryptoData.Salt.Length);
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byte[] encryptedFn = EncryptBytes(cryptoData, fileNameBytes);
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ms.Write(encryptedFn, 0, encryptedFn.Length);
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encryptedFileName = Helpers.BytesToHex(ms.ToArray());
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}
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string bytesLengthHex = fullUploadSize.ToString("X4"); // To Hex
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DateTime expiryTime = DateTime.UtcNow.AddDays(30); // Defaults from the web client
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string expiryTimeHex = ((long)(expiryTime - ORIGIN_TIME).TotalSeconds).ToString("X4"); // Expiry date in UNIX seconds in hex
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string fullFileName = $"{expiryTimeHex}-b-{bytesLengthHex}-{encryptedFileName}".ToLower();
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#endregion
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Dictionary<string, string> requestHeaders = new Dictionary<string, string>();
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requestHeaders.Add("X-Get-Raw-File", "1");
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Dictionary<string, long> postRequestJson = new Dictionary<string, long>();
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postRequestJson.Add("chunks", chunks);
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postRequestJson.Add("fileLength", fullUploadSize);
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string postResult = SendRequest(HttpMethod.POST, URLHelpers.CombineURL(APIURL, fullFileName), JsonConvert.SerializeObject(postRequestJson), RequestHelpers.ContentTypeJSON, requestHeaders);
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Vault_oooMetaInfo metaInfo = JsonConvert.DeserializeObject<Vault_oooMetaInfo>(postResult);
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if (string.IsNullOrEmpty(metaInfo.UrlPathName))
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throw new InvalidOperationException("No correct metaInfo returned");
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#region Upload in chunks
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List<byte> dumpStash = new List<byte>();
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LoopStartEnd((chunkStart, chunkEnd, i) =>
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{
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int chunkLength = chunkEnd - chunkStart;
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byte[] plainBytes = new byte[chunkLength];
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stream.Read(plainBytes, 0, chunkLength);
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byte[] encryptedBytes = EncryptBytes(cryptoData, plainBytes);
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int prependSize = 0;
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if (dumpStash.Count > 0)
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{
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using (MemoryStream ms = new MemoryStream())
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{
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ms.Write(dumpStash.ToArray(), 0, dumpStash.Count);
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ms.Write(encryptedBytes, 0, encryptedBytes.Length);
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encryptedBytes = ms.ToArray();
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}
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prependSize = dumpStash.Count;
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dumpStash.Clear();
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}
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if (encryptedBytes.Length + (i == 0 ? 16 : 0) > BYTE_CHUNK_SIZE) // 16 bytes for the salt header
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{
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dumpStash.AddRange(encryptedBytes.Skip(BYTE_CHUNK_SIZE - (i == 0 ? 16 : 0)));
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encryptedBytes = encryptedBytes.Take(BYTE_CHUNK_SIZE - (i == 0 ? 16 : 0)).ToArray();
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}
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using (MemoryStream ms = new MemoryStream())
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{
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if (i == 0)
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{
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ms.Write(Encoding.UTF8.GetBytes("Salted__"), 0, 8); // Write header
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ms.Write(cryptoData.Salt, 0, cryptoData.Salt.Length); // 8 bytes
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ms.Write(encryptedBytes, 0, encryptedBytes.Length);
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}
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else
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{
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ms.Write(encryptedBytes, 0, encryptedBytes.Length); // Write encrypted bytes
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}
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NameValueCollection headers = new NameValueCollection();
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headers.Add("X-Get-Raw-File", "1");
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int uploadChunkStart = (int)(uploadSizes[i] - prependSize);
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headers.Add("X-Put-Chunk-Start", uploadChunkStart.ToString());
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headers.Add("X-Put-Chunk-End", (uploadChunkStart + ms.Length).ToString());
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headers.Add("X-Put-JWT", metaInfo.Token);
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SendRequest(HttpMethod.PUT, URLHelpers.CombineURL(APIURL, metaInfo.UrlPathName), ms, "application/octet-stream", null, headers);
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}
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}, chunks, fileSize);
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#endregion
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UploadResult res = new UploadResult();
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res.IsURLExpected = true;
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res.URL = URLHelpers.CombineURL(APIURL, metaInfo.UrlPathName) + "#" + randomKey; // Full url with the encryption key
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return res;
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}
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private delegate void StartEndCallback(int chunkStart, int chunkEnd, int i);
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private static void LoopStartEnd(StartEndCallback callback, int chunks, long fileSize)
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{
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int lastChunkEnd = 0;
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for (int i = 0; i < chunks; i++)
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{
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int chunkStart, chunkEnd;
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if (i == 0)
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{
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chunkStart = 0;
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lastChunkEnd = chunkEnd = (int)Math.Min(fileSize, BYTE_CHUNK_SIZE);
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}
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else
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{
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chunkStart = lastChunkEnd;
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lastChunkEnd = chunkEnd = (int)Math.Min(fileSize, lastChunkEnd + BYTE_CHUNK_SIZE);
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}
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callback(chunkStart, chunkEnd, i);
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}
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}
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#region Crypto
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private static string GenerateRandomKey()
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{
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return Guid.NewGuid().ToString(); // The web client uses random uuids as keys
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}
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private static Vault_oooCryptoData DeriveCryptoData(byte[] key)
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{
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byte[] salt = new byte[8]; // 8 bytes salt like in the web client
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RandomNumberGenerator rng = RandomNumberGenerator.Create(); // Cryptographically secure
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rng.GetBytes(salt);
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Rfc2898DeriveBytes rfcDeriver = new Rfc2898DeriveBytes(key, salt, PBKDF2_ITERATIONS, HashAlgorithmName.SHA256);
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return new Vault_oooCryptoData
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{
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Salt = salt,
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Key = rfcDeriver.GetBytes(AES_KEY_SIZE / 8), // Derive the bytes from the rfcDeriver; Divide by 8 to input byte count
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IV = rfcDeriver.GetBytes(AES_BLOCK_SIZE / 8)
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};
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}
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private static byte[] EncryptBytes(Vault_oooCryptoData crypto, byte[] bytes)
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{
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using (AesManaged aes = new AesManaged())
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{
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aes.Mode = CipherMode.CBC;
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aes.KeySize = AES_KEY_SIZE;
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aes.BlockSize = AES_BLOCK_SIZE;
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aes.Key = crypto.Key;
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aes.IV = crypto.IV;
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using (MemoryStream ms = new MemoryStream())
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{
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using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(crypto.Key, crypto.IV), CryptoStreamMode.Write))
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{
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cs.Write(bytes, 0, bytes.Length); // Write all bytes into the CryptoStream
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cs.Close();
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return ms.ToArray();
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}
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}
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}
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}
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private class Vault_oooCryptoData
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{
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public byte[] Salt { get; set; }
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public byte[] Key { get; set; }
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public byte[] IV { get; set; }
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}
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#endregion
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private class Vault_oooMetaInfo
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{
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[JsonProperty("urlPathName")]
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public string UrlPathName { get; set; }
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[JsonProperty("token")]
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public string Token { get; set; }
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}
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}
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} |