Can edit authorized_keys in SSH Services, remove download keyfile support

BTCPayServer.Tests/SeleniumTester.cs

@@ -77,7 +77,7 @@ namespace BTCPayServer.Tests
 
         public string RegisterNewUser(bool isAdmin = false)
         {
-            var usr = RandomUtils.GetUInt256().ToString() + "@a.com";
+            var usr = RandomUtils.GetUInt256().ToString().Substring(64 - 20) + "@a.com";
             Driver.FindElement(By.Id("Register")).Click();
             Driver.FindElement(By.Id("Email")).SendKeys(usr);
             Driver.FindElement(By.Id("Password")).SendKeys("123456");

BTCPayServer.Tests/SeleniumTests.cs

@@ -113,6 +113,16 @@ namespace BTCPayServer.Tests
                 }
                 s.Driver.Navigate().GoToUrl(s.Link("/server/services/ssh"));
                 s.Driver.AssertNoError();
+                s.Driver.FindElement(By.Id("SSHKeyFileContent")).Clear();
+                s.Driver.FindElement(By.Id("SSHKeyFileContent")).SendKeys("tes't\r\ntest2");
+                s.Driver.FindElement(By.Id("submit")).ForceClick();
+                s.Driver.AssertNoError();
+
+                var text = s.Driver.FindElement(By.Id("SSHKeyFileContent")).Text;
+                // Browser replace \n to \r\n, so it is hard to compare exactly what we want
+                Assert.Contains("tes't", text);
+                Assert.Contains("test2", text);
+                Assert.True(s.Driver.PageSource.Contains("authorized_keys has been updated", StringComparison.OrdinalIgnoreCase));
             }
         }
 

BTCPayServer/Controllers/ServerController.cs

@@ -898,17 +898,11 @@ namespace BTCPayServer.Controllers
         }
 
         [Route("server/services/ssh")]
-        public IActionResult SSHService(bool downloadKeyFile = false)
+        public async Task<IActionResult> SSHService()
         {
             var settings = _Options.SSHSettings;
             if (settings == null)
                 return NotFound();
-            if (downloadKeyFile)
-            {
-                if (!System.IO.File.Exists(settings.KeyFile))
-                    return NotFound();
-                return File(System.IO.File.ReadAllBytes(settings.KeyFile), "application/octet-stream", "id_rsa");
-            }
 
             var server = Extensions.IsLocalNetwork(settings.Server) ? this.Request.Host.Host : settings.Server;
             SSHServiceViewModel vm = new SSHServiceViewModel();
@@ -917,9 +911,46 @@ namespace BTCPayServer.Controllers
             vm.Password = settings.Password;
             vm.KeyFilePassword = settings.KeyFilePassword;
             vm.HasKeyFile = !string.IsNullOrEmpty(settings.KeyFile);
+            vm.CanConnect = _sshState.CanUseSSH;
+            if (vm.CanConnect)
+            {
+                try
+                {
+                    using (var sshClient = await _Options.SSHSettings.ConnectAsync())
+                    {
+                        var result = await sshClient.RunBash("cat ~/.ssh/authorized_keys", TimeSpan.FromSeconds(10));
+                        vm.SSHKeyFileContent = result.Output;
+                    }
+                }
+                catch
+                {
+
+                }
+            }
             return View(vm);
         }
 
+        [HttpPost]
+        [Route("server/services/ssh")]
+        public async Task<IActionResult> SSHService(SSHServiceViewModel viewModel)
+        {
+            string newContent = viewModel?.SSHKeyFileContent ?? string.Empty;
+            newContent = newContent.Replace("\r\n", "\n", StringComparison.OrdinalIgnoreCase);
+            try
+            {
+                using (var sshClient = await _Options.SSHSettings.ConnectAsync())
+                {
+                    await sshClient.RunBash($"mkdir -p ~/.ssh && echo '{newContent.EscapeSingleQuotes()}' > ~/.ssh/authorized_keys", TimeSpan.FromSeconds(10));
+                }
+                StatusMessage = "authorized_keys has been updated";
+            }
+            catch (Exception ex)
+            {
+                StatusMessage = $"Error: {ex.Message}";
+            }
+            return RedirectToAction(nameof(SSHService));
+        }
+
         [Route("server/theme")]
         public async Task<IActionResult> Theme()
         {

BTCPayServer/Extensions/SSHClientExtensions.cs

@@ -49,13 +49,18 @@ namespace BTCPayServer
             return tcs.Task;
         }
 
+        public static string EscapeSingleQuotes(this string command)
+        {
+            return command.Replace("'", "'\"'\"'", StringComparison.OrdinalIgnoreCase);
+        }
+
         public static Task<SSHCommandResult> RunBash(this SshClient sshClient, string command, TimeSpan? timeout = null)
         {
             if (sshClient == null)
                 throw new ArgumentNullException(nameof(sshClient));
             if (command == null)
                 throw new ArgumentNullException(nameof(command));
-            command = $"sudo bash -c '{command}'";
+            command = $"bash -c '{command.EscapeSingleQuotes()}'";
             var sshCommand = sshClient.CreateCommand(command);
             if (timeout is TimeSpan v)
                 sshCommand.CommandTimeout = v;

BTCPayServer/Models/ServerViewModels/SSHServiceViewModel.cs

@@ -11,5 +11,7 @@ namespace BTCPayServer.Models.ServerViewModels
         public string Password { get; set; }
         public string KeyFilePassword { get; set; }
         public bool HasKeyFile { get; set; }
+        public bool CanConnect { get; set; }
+        public string SSHKeyFileContent { get; set; }
     }
 }

BTCPayServer/Views/Server/SSHService.cshtml

@@ -5,7 +5,7 @@
 
 
 <h4>SSH settings</h4>
-<partial name="_StatusMessage" for="@TempData["StatusMessage"]" />
+<partial name="_StatusMessage" for="@TempData["TempDataProperty-StatusMessage"]" />
 <div class="row">
     <div class="col-md-6">
         <div asp-validation-summary="All" class="text-danger"></div>
@@ -41,10 +41,29 @@
                     <input asp-for="KeyFilePassword" readonly class="form-control" />
                 </div>
             }
-            @if(Model.HasKeyFile)
+        </div>
+    </div>
+</div>
+
+@if (Model.CanConnect)
 {
-                <a class="btn btn-primary form-control" asp-action="SSHService" asp-route-downloadKeyFile="true">Download Key File</a>
+    <h4>Authorized keys</h4>
+    <div class="row">
+
+        <div class="col-md-8">
+            <div class="form-group">
+                <p>
+                    <span>You can enter here SSH public keys authorized to connect to your server.<br /></span>
+                </p>
+            </div>
+
+            <form method="post">
+                <div class="form-group">
+                    <textarea asp-for="SSHKeyFileContent" rows="20" cols="80" class="form-control"></textarea>
+                    <span asp-validation-for="SSHKeyFileContent" class="text-danger"></span>
+                </div>
+                <button id="submit" type="submit" class="btn btn-primary" value="Save">Save</button>
+            </form>
+        </div>
+    </div>
 }
-        </div>
-    </div>
-</div>