Spring security 同时支持多种加密方式

heasy3

发布于 2021-03-03 11:05:46

7570

发布于 2021-03-03 11:05:46

文章被收录于专栏：用户7614879的专栏

参考文章：http://www.javaboy.org/2020/0618/passwordencoder.html

spring security一系列都是从这里学的非常感谢作者

在security框架中如果没有创建任何一个PasswordEncoder 则会使用默认的，如果在容器中有PasswordEncoder 则会使用容器中的，源码如下：

@Order(InitializeUserDetailsBeanManagerConfigurer.DEFAULT_ORDER)
class InitializeUserDetailsBeanManagerConfigurer extends GlobalAuthenticationConfigurerAdapter {

	static final int DEFAULT_ORDER = Ordered.LOWEST_PRECEDENCE - 5000;

	private final ApplicationContext context;

	/**
	 * @param context
	 */
	InitializeUserDetailsBeanManagerConfigurer(ApplicationContext context) {
		this.context = context;
	}

	@Override
	public void init(AuthenticationManagerBuilder auth) throws Exception {
		auth.apply(new InitializeUserDetailsManagerConfigurer());
	}

	class InitializeUserDetailsManagerConfigurer extends GlobalAuthenticationConfigurerAdapter {

		@Override
		public void configure(AuthenticationManagerBuilder auth) throws Exception {
			if (auth.isConfigured()) {
				return;
			}
			UserDetailsService userDetailsService = getBeanOrNull(UserDetailsService.class);
			if (userDetailsService == null) {
				return;
			}
            //从容器中获取 没有则会返回null
			PasswordEncoder passwordEncoder = getBeanOrNull(PasswordEncoder.class);
			UserDetailsPasswordService passwordManager = getBeanOrNull(UserDetailsPasswordService.class);
            //Provider的构造方法中 设置了默认的
			DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
			provider.setUserDetailsService(userDetailsService);
            //如果不是null 则使用容器中获取的
			if (passwordEncoder != null) {
				provider.setPasswordEncoder(passwordEncoder);
			}
			if (passwordManager != null) {
				provider.setUserDetailsPasswordService(passwordManager);
			}
			provider.afterPropertiesSet();
			auth.authenticationProvider(provider);
		}

		/**
		 * @return a bean of the requested class if there's just a single registered
		 * component, null otherwise.
		 */
		private <T> T getBeanOrNull(Class<T> type) {
			String[] beanNames = InitializeUserDetailsBeanManagerConfigurer.this.context.getBeanNamesForType(type);
			if (beanNames.length != 1) {
				return null;
			}
			return InitializeUserDetailsBeanManagerConfigurer.this.context.getBean(beanNames[0], type);
		}

	}

}

而默认的encoder是一个同时支持多种加密方式的代理对象 provider的构造方法如下：

	public DaoAuthenticationProvider() {
		setPasswordEncoder(PasswordEncoderFactories.createDelegatingPasswordEncoder());
	}

里面的具体实现是

	@SuppressWarnings("deprecation")
	public static PasswordEncoder createDelegatingPasswordEncoder() {
		String encodingId = "bcrypt";
		Map<String, PasswordEncoder> encoders = new HashMap<>();
		encoders.put(encodingId, new BCryptPasswordEncoder());
		encoders.put("ldap", new org.springframework.security.crypto.password.LdapShaPasswordEncoder());
		encoders.put("MD4", new org.springframework.security.crypto.password.Md4PasswordEncoder());
		encoders.put("MD5", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("MD5"));
		encoders.put("noop", org.springframework.security.crypto.password.NoOpPasswordEncoder.getInstance());
		encoders.put("pbkdf2", new Pbkdf2PasswordEncoder());
		encoders.put("scrypt", new SCryptPasswordEncoder());
		encoders.put("SHA-1", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-1"));
		encoders.put("SHA-256",
				new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-256"));
		encoders.put("sha256", new org.springframework.security.crypto.password.StandardPasswordEncoder());
		encoders.put("argon2", new Argon2PasswordEncoder());
		return new DelegatingPasswordEncoder(encodingId, encoders);
	}

可以看到生成了一个DelegatingPasswordEncoder对象使用的ID是bcrypt 也就代表了该encoder 加密时使用的是bcrypt，解密时可以根据密码所带前缀选择不同的解密方式，如果没有带加密前缀，则会使用默认的default方式。

	private PasswordEncoder defaultPasswordEncoderForMatches = new UnmappedIdPasswordEncoder();




	private class UnmappedIdPasswordEncoder implements PasswordEncoder {

		@Override
		public String encode(CharSequence rawPassword) {
			throw new UnsupportedOperationException("encode is not supported");
		}

		@Override
		public boolean matches(CharSequence rawPassword, String prefixEncodedPassword) {
			String id = extractId(prefixEncodedPassword);
			throw new IllegalArgumentException("There is no PasswordEncoder mapped for the id \"" + id + "\"");
		}

	}

可以看到，默认都会直接抛出异常。

前缀带密码是这样的：

{bcrypt}$2a$10$Sb1gAUH4wwazfNiqflKZve4Ubh.spJcxgHG8Cp29DeGya5zsHENqi
{MD5}{Wucj/L8wMTMzFi3oBKWsETNeXbMFaHZW9vCK9mahMHc=}4d43db282b36d7f0421498fdc693f2a2
{noop}123

所以如果需要同时支持多种解密方式，只需要将原本的map扩展一下，使其支持自己写的encoder，并且将默认encoder的设置成你想要的，作为没有前缀时的解密方式即可。

当然直接使用自己写的encoder 在其中加入各种判断也是可以的。看个人选择。

@Bean
public PasswordEncoder passwordEncoder() {
    return MyPasswordEncoderFactories.createDelegatingPasswordEncoder();
}

class MyPasswordEncoderFactories {
 
    @SuppressWarnings("deprecation")
    static PasswordEncoder createDelegatingPasswordEncoder() {
        String encodingId = "bcrypt";
        Map<String, PasswordEncoder> encoders = new HashMap<>();
        encoders.put(encodingId, new BCryptPasswordEncoder());
        encoders.put("ldap", new org.springframework.security.crypto.password.LdapShaPasswordEncoder());
        encoders.put("MD4", new org.springframework.security.crypto.password.Md4PasswordEncoder());
        encoders.put("MD5", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("MD5"));
        encoders.put("noop", org.springframework.security.crypto.password.NoOpPasswordEncoder.getInstance());
        encoders.put("pbkdf2", new Pbkdf2PasswordEncoder());
        encoders.put("scrypt", new SCryptPasswordEncoder());
        encoders.put("SHA-1", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-1"));
        encoders.put("SHA-256", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-256"));
        //加入自定义前缀
        encoders.put("SM3",new MyPasswordEncoder());
        DelegatingPasswordEncoder delegatingPasswordEncoder = new DelegatingPasswordEncoder(encodingId, encoders);
        //指定没有前缀时使用的方式
        delegatingPasswordEncoder.setDefaultPasswordEncoderForMatches(new MyPasswordEncoder());
        return delegatingPasswordEncoder;
    }
 
}

这样就可以使用多种加密方式了。

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原始发表：2021/02/07 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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