/*
* Copyright (c) 1997, 2000, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
package sun.security.x509;
import java.io.IOException;
import sun.security.util.*;
/**
* This class implements the RFC822Name as required by the GeneralNames
* ASN.1 object.
*
* @author Amit Kapoor
* @author Hemma Prafullchandra
* @see GeneralName
* @see GeneralNames
* @see GeneralNameInterface
*/
public class RFC822Name implements GeneralNameInterface
{
private String name;
/**
* Create the RFC822Name object from the passed encoded Der value.
*
* @param derValue the encoded DER RFC822Name.
* @exception IOException on error.
*/
public RFC822Name(DerValue derValue) throws IOException {
name = derValue.getIA5String();
parseName(name);
}
/**
* Create the RFC822Name object with the specified name.
*
* @param name the RFC822Name.
* @throws IOException on invalid input name
*/
public RFC822Name(String name) throws IOException {
parseName(name);
this.name = name;
}
/**
* Parse an RFC822Name string to see if it is a valid
* addr-spec according to IETF RFC822 and RFC2459:
* [local-part@]domain
* <p>
* local-part@ could be empty for an RFC822Name NameConstraint,
* but the domain at least must be non-empty. Case is not
* significant.
*
* @param name the RFC822Name string
* @throws IOException if name is not valid
*/
public void parseName(String name) throws IOException {
if (name == null || name.length() == 0) {
throw new IOException("RFC822Name may not be null or empty");
}
// See if domain is a valid domain name
String domain = name.substring(name.indexOf('@')+1);
if (domain.length() == 0) {
throw new IOException("RFC822Name may not end with @");
} else {
//An RFC822 NameConstraint could start with a ., although
//a DNSName may not
if (domain.startsWith(".")) {
if (domain.length() == 1)
throw new IOException("RFC822Name domain may not be just .");
}
}
}
/**
* Return the type of the GeneralName.
*/
public int getType() {
return (GeneralNameInterface.NAME_RFC822);
}
/**
* Return the actual name value of the GeneralName.
*/
public String getName() {
return name;
}
/**
* Encode the RFC822 name into the DerOutputStream.
*
* @param out the DER stream to encode the RFC822Name to.
* @exception IOException on encoding errors.
*/
public void encode(DerOutputStream out) throws IOException {
out.putIA5String(name);
}
/**
* Convert the name into user readable string.
*/
public String toString() {
return ("RFC822Name: " + name);
}
/**
* Compares this name with another, for equality.
*
* @return true iff the names are equivalent
* according to RFC2459.
*/
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!(obj instanceof RFC822Name))
return false;
RFC822Name other = (RFC822Name)obj;
// RFC2459 mandates that these names are
// not case-sensitive
return name.equalsIgnoreCase(other.name);
}
/**
* Returns the hash code value for this object.
*
* @return a hash code value for this object.
*/
public int hashCode() {
return name.toUpperCase().hashCode();
}
/**
* Return constraint type:<ul>
* <li>NAME_DIFF_TYPE = -1: input name is different type from name (i.e. does not constrain)
* <li>NAME_MATCH = 0: input name matches name
* <li>NAME_NARROWS = 1: input name narrows name
* <li>NAME_WIDENS = 2: input name widens name
* <li>NAME_SAME_TYPE = 3: input name does not match or narrow name, but is same type
* </ul>. These results are used in checking NameConstraints during
* certification path verification.
* <p>
* [RFC2459] When the subjectAltName extension contains an Internet mail address,
* the address MUST be included as an rfc822Name. The format of an
* rfc822Name is an "addr-spec" as defined in RFC 822 [RFC 822]. An
* addr-spec has the form "local-part@domain". Note that an addr-spec
* has no phrase (such as a common name) before it, has no comment (text
* surrounded in parentheses) after it, and is not surrounded by "<" and
* ">". Note that while upper and lower case letters are allowed in an
* RFC 822 addr-spec, no significance is attached to the case.
* <p>
* @param inputName to be checked for being constrained
* @returns constraint type above
* @throws UnsupportedOperationException if name is not exact match, but narrowing and widening are
* not supported for this name type.
*/
public int constrains(GeneralNameInterface inputName) throws UnsupportedOperationException {
int constraintType;
if (inputName == null)
constraintType = NAME_DIFF_TYPE;
else if (inputName.getType() != (GeneralNameInterface.NAME_RFC822)) {
constraintType = NAME_DIFF_TYPE;
} else {
//RFC2459 specifies that case is not significant in RFC822Names
String inName = (((RFC822Name)inputName).getName()).toLowerCase();
String thisName = name.toLowerCase();
if (inName.equals(thisName)) {
constraintType = NAME_MATCH;
} else if (thisName.endsWith(inName)) {
/* if both names contain @, then they had to match exactly */
if (inName.indexOf('@') != -1) {
constraintType = NAME_SAME_TYPE;
} else if (inName.startsWith(".")) {
constraintType = NAME_WIDENS;
} else {
int inNdx = thisName.lastIndexOf(inName);
if (thisName.charAt(inNdx-1) == '@' ) {
constraintType = NAME_WIDENS;
} else {
constraintType = NAME_SAME_TYPE;
}
}
} else if (inName.endsWith(thisName)) {
/* if thisName contains @, then they had to match exactly */
if (thisName.indexOf('@') != -1) {
constraintType = NAME_SAME_TYPE;
} else if (thisName.startsWith(".")) {
constraintType = NAME_NARROWS;
} else {
int ndx = inName.lastIndexOf(thisName);
if (inName.charAt(ndx-1) == '@') {
constraintType = NAME_NARROWS;
} else {
constraintType = NAME_SAME_TYPE;
}
}
} else {
constraintType = NAME_SAME_TYPE;
}
}
return constraintType;
}
/**
* Return subtree depth of this name for purposes of determining
* NameConstraints minimum and maximum bounds.
*
* @returns distance of name from root
* @throws UnsupportedOperationException if not supported for this name type
*/
public int subtreeDepth() throws UnsupportedOperationException {
String subtree=name;
int i=1;
/* strip off name@ portion */
int atNdx = subtree.lastIndexOf('@');
if (atNdx >= 0) {
i++;
subtree=subtree.substring(atNdx+1);
}
/* count dots in dnsname, adding one if dnsname preceded by @ */
for (; subtree.lastIndexOf('.') >= 0; i++) {
subtree=subtree.substring(0,subtree.lastIndexOf('.'));
}
return i;
}
}