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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.client.config.keys;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import java.util.function.Function;
import org.apache.sshd.common.NamedResource;
import org.apache.sshd.common.config.keys.BuiltinIdentities;
import org.apache.sshd.common.config.keys.FilePasswordProvider;
import org.apache.sshd.common.config.keys.IdentityUtils;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.io.FileInfoExtractor;
import org.apache.sshd.common.util.io.IoUtils;
/**
* Provides keys loading capability from the user's keys folder - e.g., {@code id_rsa}
*
* @author Apache MINA SSHD Project
* @see org.apache.sshd.common.util.security.SecurityUtils#getKeyPairResourceParser()
*/
public final class ClientIdentity {
public static final String ID_FILE_PREFIX = "id_";
public static final String ID_FILE_SUFFIX = "";
public static final Function ID_GENERATOR = ClientIdentity::getIdentityFileName;
private ClientIdentity() {
throw new UnsupportedOperationException("No instance");
}
/**
* @param name The file name - ignored if {@code null}/empty
* @return The identity type - {@code null} if cannot determine it - e.g., does not start with the
* {@link #ID_FILE_PREFIX}
*/
public static String getIdentityType(String name) {
if (GenericUtils.isEmpty(name)
|| (name.length() <= ID_FILE_PREFIX.length())
|| (!name.startsWith(ID_FILE_PREFIX))) {
return null;
} else {
return name.substring(ID_FILE_PREFIX.length());
}
}
public static String getIdentityFileName(NamedResource r) {
return getIdentityFileName((r == null) ? null : r.getName());
}
/**
* @param type The identity type - e.g., {@code rsa} - ignored if {@code null}/empty
* @return The matching file name for the identity - {@code null} if no name
* @see #ID_FILE_PREFIX
* @see #ID_FILE_SUFFIX
* @see IdentityUtils#getIdentityFileName(String, String, String)
*/
public static String getIdentityFileName(String type) {
return IdentityUtils.getIdentityFileName(ID_FILE_PREFIX, type, ID_FILE_SUFFIX);
}
/**
* @param strict If {@code true} then files that do not have the required access rights are
* excluded from consideration
* @param supportedOnly If {@code true} then ignore identities that are not supported internally
* @param provider A {@link FilePasswordProvider} - may be {@code null} if the loaded keys are
* guaranteed not to be encrypted. The argument to
* {@code FilePasswordProvider#getPassword} is the path of the file whose key is to
* be loaded
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link KeyPair} for the identities - {@code null} if no identities available
* (e.g., after filtering unsupported ones or strict permissions)
* @throws IOException If failed to access the file system
* @throws GeneralSecurityException If failed to load the keys
* @see PublicKeyEntry#getDefaultKeysFolderPath()
* @see #loadDefaultIdentities(Path, boolean, FilePasswordProvider, LinkOption...)
*/
public static KeyPairProvider loadDefaultKeyPairProvider(
boolean strict, boolean supportedOnly, FilePasswordProvider provider, LinkOption... options)
throws IOException, GeneralSecurityException {
return loadDefaultKeyPairProvider(PublicKeyEntry.getDefaultKeysFolderPath(), strict, supportedOnly, provider, options);
}
/**
* @param dir The folder to scan for the built-in identities
* @param strict If {@code true} then files that do not have the required access rights are
* excluded from consideration
* @param supportedOnly If {@code true} then ignore identities that are not supported internally
* @param provider A {@link FilePasswordProvider} - may be {@code null} if the loaded keys are
* guaranteed not to be encrypted. The argument to
* {@code FilePasswordProvider#getPassword} is the path of the file whose key is to
* be loaded
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link KeyPair} for the identities - {@code null} if no identities available
* (e.g., after filtering unsupported ones or strict permissions)
* @throws IOException If failed to access the file system
* @throws GeneralSecurityException If failed to load the keys
* @see #loadDefaultIdentities(Path, boolean, FilePasswordProvider, LinkOption...)
* @see IdentityUtils#createKeyPairProvider(Map, boolean)
*/
public static KeyPairProvider loadDefaultKeyPairProvider(
Path dir, boolean strict, boolean supportedOnly, FilePasswordProvider provider, LinkOption... options)
throws IOException, GeneralSecurityException {
Map ids = loadDefaultIdentities(dir, strict, provider, options);
return IdentityUtils.createKeyPairProvider(ids, supportedOnly);
}
/**
* @param strict If {@code true} then files that do not have the required access rights are
* excluded from consideration
* @param provider A {@link FilePasswordProvider} - may be {@code null} if the loaded keys are
* guaranteed not to be encrypted. The argument to
* {@code FilePasswordProvider#getPassword} is the path of the file whose key is to
* be loaded
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link Map} of the found files where key=identity type (case
* insensitive), value=the {@link KeyPair} of the identity
* @throws IOException If failed to access the file system
* @throws GeneralSecurityException If failed to load the keys
* @see PublicKeyEntry#getDefaultKeysFolderPath()
* @see #loadDefaultIdentities(Path, boolean, FilePasswordProvider, LinkOption...)
*/
public static Map loadDefaultIdentities(
boolean strict, FilePasswordProvider provider, LinkOption... options)
throws IOException, GeneralSecurityException {
return loadDefaultIdentities(PublicKeyEntry.getDefaultKeysFolderPath(), strict, provider, options);
}
/**
* @param dir The folder to scan for the built-in identities
* @param strict If {@code true} then files that do not have the required access rights are
* excluded from consideration
* @param provider A {@link FilePasswordProvider} - may be {@code null} if the loaded keys are
* guaranteed not to be encrypted. The argument to
* {@code FilePasswordProvider#getPassword} is the path of the file whose key is to
* be loaded
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link Map} of the found files where key=identity type (case
* insensitive), value=the {@link KeyPair} of the identity
* @throws IOException If failed to access the file system
* @throws GeneralSecurityException If failed to load the keys
* @see BuiltinIdentities
*/
public static Map loadDefaultIdentities(
Path dir, boolean strict, FilePasswordProvider provider, LinkOption... options)
throws IOException, GeneralSecurityException {
return loadIdentities(null, dir, strict, BuiltinIdentities.NAMES, ID_GENERATOR, provider, options);
}
/**
* Scans a folder and loads all available identity files
*
* @param session The {@link SessionContext} for invoking this load command - may be {@code null}
* if not invoked within a session context (e.g., offline tool or session unknown).
* @param dir The {@link Path} of the folder to scan - ignored if not exists
* @param strict If {@code true} then files that do not have the required access rights are
* excluded from consideration
* @param types The identity types - ignored if {@code null}/empty
* @param idGenerator A {@link Function} to derive the file name holding the specified type
* @param provider A {@link FilePasswordProvider} - may be {@code null} if the loaded keys are
* guaranteed not to be encrypted. The argument to
* {@code FilePasswordProvider#getPassword} is the path of the file whose key is to
* be loaded
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link Map} of the found files where key=identity type (case
* insensitive), value=the {@link KeyPair} of the identity
* @throws IOException If failed to access the file system
* @throws GeneralSecurityException If failed to load the keys
*/
public static Map loadIdentities(
SessionContext session, Path dir, boolean strict,
Collection types, Function idGenerator,
FilePasswordProvider provider, LinkOption... options)
throws IOException, GeneralSecurityException {
Map paths = scanIdentitiesFolder(dir, strict, types, idGenerator, options);
return IdentityUtils.loadIdentities(session, paths, provider, IoUtils.EMPTY_OPEN_OPTIONS);
}
/**
* Scans a folder for possible identity files
*
* @param dir The {@link Path} of the folder to scan - ignored if not exists
* @param strict If {@code true} then files that do not have the required access rights are excluded from
* consideration
* @param types The identity types - ignored if {@code null}/empty
* @param idGenerator A {@link Function} to derive the file name holding the specified type
* @param options The {@link LinkOption}s to apply when checking for existence
* @return A {@link Map} of the found files where key=identity type (case insensitive), value=the
* {@link Path} of the file holding the key
* @throws IOException If failed to access the file system
* @see KeyUtils#validateStrictKeyFilePermissions(Path, LinkOption...)
*/
public static Map scanIdentitiesFolder(
Path dir, boolean strict, Collection types, Function idGenerator,
LinkOption... options)
throws IOException {
if (GenericUtils.isEmpty(types)) {
return Collections.emptyMap();
}
if (!Files.exists(dir, options)) {
return Collections.emptyMap();
}
ValidateUtils.checkTrue(FileInfoExtractor.ISDIR.infoOf(dir, options), "Not a directory: %s", dir);
Map paths = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
for (String t : types) {
String fileName = idGenerator.apply(t);
Path p = dir.resolve(fileName);
if (!Files.exists(p, options)) {
continue;
}
if (strict) {
if (KeyUtils.validateStrictKeyFilePermissions(p, options) != null) {
continue;
}
}
Path prev = paths.put(t, p);
ValidateUtils.checkTrue(prev == null, "Multiple mappings for type=%s", t);
}
return paths;
}
}
