70 lines
1.9 KiB
Java
70 lines
1.9 KiB
Java
package eu.siacs.conversations.crypto.sasl;
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import java.security.SecureRandom;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.xml.TagWriter;
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public abstract class SaslMechanism {
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final protected TagWriter tagWriter;
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final protected Account account;
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final protected SecureRandom rng;
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protected enum State {
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INITIAL,
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AUTH_TEXT_SENT,
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RESPONSE_SENT,
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VALID_SERVER_RESPONSE,
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}
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public static class AuthenticationException extends Exception {
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public AuthenticationException(final String message) {
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super(message);
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}
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public AuthenticationException(final Exception inner) {
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super(inner);
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}
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public AuthenticationException(final String message, final Exception exception) {
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super(message, exception);
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}
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}
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public static class InvalidStateException extends AuthenticationException {
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public InvalidStateException(final String message) {
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super(message);
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}
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public InvalidStateException(final State state) {
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this("Invalid state: " + state.toString());
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}
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}
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public SaslMechanism(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
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this.tagWriter = tagWriter;
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this.account = account;
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this.rng = rng;
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}
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/**
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* The priority is used to pin the authentication mechanism. If authentication fails, it MAY be retried with another
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* mechanism of the same priority, but MUST NOT be tried with a mechanism of lower priority (to prevent downgrade
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* attacks).
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*
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* @return An arbitrary int representing the priority
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*/
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public abstract int getPriority();
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public abstract String getMechanism();
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public String getClientFirstMessage() {
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return "";
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}
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public String getResponse(final String challenge) throws AuthenticationException {
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return "";
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}
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}
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