82 lines
2.7 KiB
Plaintext
82 lines
2.7 KiB
Plaintext
== Why is this an issue?
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To prevent URL spoofing, ``++HostnameVerifier.verify()++`` methods should do more than simply ``++return true++``. Doing so may get you quickly past an exception, but that comes at the cost of opening a security hole in your application.
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=== Noncompliant code example
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[source,java]
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----
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SSLContext sslcontext = SSLContext.getInstance( "TLS" );
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sslcontext.init(null, new TrustManager[]{new X509TrustManager() {
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public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
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public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
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public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; }
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}}, new java.security.SecureRandom());
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Client client = ClientBuilder.newBuilder().sslContext(sslcontext).hostnameVerifier(new HostnameVerifier() {
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@Override
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public boolean verify(String requestedHost, SSLSession remoteServerSession) {
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return true; // Noncompliant
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}
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}).build();
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----
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=== Compliant solution
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[source,java]
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----
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SSLContext sslcontext = SSLContext.getInstance( "TLSv1.2" );
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sslcontext.init(null, new TrustManager[]{new X509TrustManager() {
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@Override
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public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
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@Override
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public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
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@Override
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public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; }
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}}, new java.security.SecureRandom());
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Client client = ClientBuilder.newBuilder().sslContext(sslcontext).hostnameVerifier(new HostnameVerifier() {
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@Override
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public boolean verify(String requestedHost, SSLSession remoteServerSession) {
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return requestedHost.equalsIgnoreCase(remoteServerSession.getPeerHost()); // Compliant
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}
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}).build();
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----
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== Resources
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* OWASP - https://owasp.org/www-project-top-ten/2017/A6_2017-Security_Misconfiguration[Top 10 2017 Category A6 - Security Misconfiguration]
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* CWE - https://cwe.mitre.org/data/definitions/295[CWE-295 - Improper Certificate Validation]
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* Derived from FindSecBugs rule https://find-sec-bugs.github.io/bugs.htm#WEAK_HOSTNAME_VERIFIER[WEAK_HOSTNAME_VERIFIER]
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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=== Message
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Do not unconditionally return true in this method.
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=== Highlighting
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return statement
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'''
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== Comments And Links
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(visible only on this page)
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=== on 5 Mar 2018, 15:16:24 Alexandre Gigleux wrote:
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There is no SEI CERT ID for this one in \https://wiki.sei.cmu.edu/confluence/display/java/SEI+CERT+Oracle+Coding+Standard+for+Java
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endif::env-github,rspecator-view[]
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