Add SFTP host key check example

examples/sftp/src/test/java/org/example/SftpContainerTest.java

@@ -1,6 +1,7 @@
 package org.example;
 
 import com.jcraft.jsch.ChannelSftp;
+import com.jcraft.jsch.HostKey;
 import com.jcraft.jsch.JSch;
 import com.jcraft.jsch.Session;
 import org.junit.jupiter.api.Test;
@@ -10,6 +11,7 @@
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.util.Base64;
 import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -49,4 +51,55 @@ void test() throws Exception {
                 .noneMatch(item -> item.toString().contains("testcontainers/file.txt"));
         }
     }
+
+    @Test
+    void testHostKeyCheck() throws Exception {
+        try (
+            GenericContainer<?> sftp = new GenericContainer<>("atmoz/sftp:alpine-3.7")
+                .withCopyFileToContainer(
+                    MountableFile.forClasspathResource("testcontainers/", 0777),
+                    "/home/foo/upload/testcontainers"
+                )
+                .withCopyFileToContainer(
+                    MountableFile.forClasspathResource("./ssh_host_rsa_key", 0400),
+                    "/etc/ssh/ssh_host_rsa_key"
+                )
+                .withExposedPorts(22)
+                .withCommand("foo:pass:::upload")
+        ) {
+            sftp.start();
+            JSch jsch = new JSch();
+            Session jschSession = jsch.getSession("foo", sftp.getHost(), sftp.getMappedPort(22));
+            jschSession.setPassword("pass");
+            // hostKeyString is string starting with AAAA from file known_hosts or ssh_host_*_key.pub
+            // generate the files with:
+            // ssh-keygen -t rsa -b 3072 -f ssh_host_rsa_key < /dev/null
+            String hostKeyString =
+                "AAAAB3NzaC1yc2EAAAADAQABAAABgQCXMxVRzmFWxfrRB9XiZ/3HNM+xkYYE+IMGuOZD" +
+                "04M2ezU25XjT6cPajzpFmzTxR2qEpRCKHeVnSG5nT6UXQp7760brTN7m5sDasbMnHgYh" +
+                "fC/3of2k6qTR9X/JHRpgwzq5+6FtEe41w1H1dXoNIr4YTKnLijSp8MKqBtPPNUpzEVb9" +
+                "5YKZGdCDoCbbYOyS/Dc8azUDo0mqM542J3nA2Sq9HCP0BAv43hrTAtCZodkB5wo18exb" +
+                "fPKsjGtA3de2npybFoSRbavZmT8L/b2iHZX6FRaqLsbYGKtszCWu5OU7WBX5g5QVlLfO" +
+                "nGQ+LsF6d6pX5LlMwEU14uu4gNPvZFOaZXtHNHZqnBcjd/sMaw5N/atFsPgtQ0vYnrEA" +
+                "D6oDjj0uXMsnmgUWTZBi3q2GBWWPqhE+0ASb2xBQGa+tWWTVYbuuYlA7hUX0URK8FcLw" +
+                "4UOYJjscDjnjlvQkghd2esP5NxV1NXkG2XYNHnf1E/tH4+AHJzy+qOQom7ehda96FZ8=";
+            HostKey hostKey = new HostKey(sftp.getHost(), Base64.getDecoder().decode(hostKeyString));
+            jschSession.getHostKeyRepository().add(hostKey, null);
+            jschSession.connect();
+            ChannelSftp channel = (ChannelSftp) jschSession.openChannel("sftp");
+            channel.connect();
+            assertThat(channel.ls("/upload/testcontainers")).anyMatch(item -> item.toString().contains("file.txt"));
+            assertThat(
+                new BufferedReader(
+                    new InputStreamReader(channel.get("/upload/testcontainers/file.txt"), StandardCharsets.UTF_8)
+                )
+                    .lines()
+                    .collect(Collectors.joining("\n"))
+            )
+                .contains("Testcontainers");
+            channel.rm("/upload/testcontainers/file.txt");
+            assertThat(channel.ls("/upload/testcontainers/"))
+                .noneMatch(item -> item.toString().contains("testcontainers/file.txt"));
+        }
+    }
 }

examples/sftp/src/test/resources/ssh_host_rsa_key

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----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+-----END OPENSSH PRIVATE KEY-----

examples/sftp/src/test/resources/ssh_host_rsa_key.pub

@@ -0,0 +1 @@
+ssh-rsa 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 someone@localhost