1 | package net.deterlab.abac; |
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2 | |
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3 | import java.io.*; |
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4 | import java.math.*; |
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5 | import java.text.*; |
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6 | |
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7 | import java.util.*; |
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8 | import java.security.*; |
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9 | import java.security.cert.*; |
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10 | |
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11 | import javax.security.auth.x500.*; |
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12 | |
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13 | import javax.xml.parsers.*; |
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14 | import javax.xml.transform.*; |
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15 | import javax.xml.transform.dom.*; |
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16 | import javax.xml.transform.stream.*; |
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17 | |
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18 | import javax.xml.crypto.*; |
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19 | import javax.xml.crypto.dsig.*; |
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20 | import javax.xml.crypto.dsig.dom.*; |
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21 | import javax.xml.crypto.dsig.keyinfo.*; |
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22 | import javax.xml.crypto.dsig.spec.*; |
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23 | |
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24 | import org.xml.sax.*; |
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25 | import org.w3c.dom.*; |
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26 | |
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27 | import org.bouncycastle.asn1.*; |
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28 | import org.bouncycastle.asn1.x509.*; |
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29 | import org.bouncycastle.x509.*; |
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30 | import org.bouncycastle.x509.util.*; |
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31 | import org.bouncycastle.openssl.*; |
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32 | |
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33 | /** |
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34 | * An ABAC credential formatted as an abac-type GENI credential. |
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35 | * @author <a href="http://abac.deterlab.net">ISI ABAC team</a> |
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36 | * @version 1.4 |
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37 | */ |
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38 | public class GENICredential extends Credential implements Comparable { |
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39 | /** The signed XML representing this credential */ |
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40 | protected Document doc; |
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41 | |
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42 | /** |
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43 | * X509KeySelector implementation from |
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44 | * http://www.outsourcingi.com/art-271-Programming-With-the-Java-XML-Digital-Signature-API.html |
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45 | * . |
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46 | * |
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47 | * Straight ahead extraction of a key from an X509 cert, but it is their |
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48 | * code and hard to improve on. |
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49 | */ |
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50 | static protected class X509KeySelector extends KeySelector { |
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51 | public KeySelectorResult select(KeyInfo keyInfo, |
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52 | KeySelector.Purpose purpose, |
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53 | AlgorithmMethod method, |
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54 | XMLCryptoContext context) |
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55 | throws KeySelectorException { |
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56 | Iterator ki = keyInfo.getContent().iterator(); |
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57 | while (ki.hasNext()) { |
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58 | XMLStructure info = (XMLStructure) ki.next(); |
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59 | if (!(info instanceof X509Data)) |
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60 | continue; |
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61 | X509Data x509Data = (X509Data) info; |
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62 | Iterator xi = x509Data.getContent().iterator(); |
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63 | while (xi.hasNext()) { |
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64 | Object o = xi.next(); |
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65 | if (!(o instanceof X509Certificate)) |
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66 | continue; |
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67 | final PublicKey key = ((X509Certificate)o).getPublicKey(); |
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68 | // Make sure the algorithm is compatible |
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69 | // with the method. |
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70 | if (algEquals(method.getAlgorithm(), key.getAlgorithm())) { |
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71 | return new KeySelectorResult() { |
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72 | public Key getKey() { return key; } |
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73 | }; |
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74 | } |
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75 | } |
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76 | } |
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77 | throw new KeySelectorException("No key found!"); |
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78 | } |
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79 | |
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80 | boolean algEquals(String algURI, String algName) { |
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81 | if ((algName.equalsIgnoreCase("DSA") && |
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82 | algURI.equalsIgnoreCase(SignatureMethod.DSA_SHA1)) || |
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83 | (algName.equalsIgnoreCase("RSA") && |
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84 | |
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85 | algURI.equalsIgnoreCase(SignatureMethod.RSA_SHA1))) { |
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86 | return true; |
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87 | } else { |
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88 | return false; |
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89 | } |
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90 | } |
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91 | } |
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92 | |
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93 | /** |
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94 | * Create an empty Credential. |
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95 | */ |
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96 | public GENICredential() { |
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97 | m_head = m_tail = null; |
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98 | doc = null; |
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99 | id = null; |
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100 | } |
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101 | /** |
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102 | * Create a credential from a head and tail role. This credential has no |
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103 | * underlying certificate, and cannot be exported or used in real proofs. |
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104 | * make_cert can create a certificate for a credential initialized this |
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105 | * way. |
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106 | * @param head the Role at the head of the credential |
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107 | * @param tail the Role at the tail of the credential |
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108 | */ |
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109 | public GENICredential(Role head, Role tail) { |
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110 | m_head = head; |
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111 | m_tail = tail; |
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112 | doc = null; |
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113 | id = null; |
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114 | } |
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115 | |
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116 | /** |
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117 | * Do the credential extraction from an input stream. This parses the |
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118 | * certificate from the input stream and saves it. The contents must be |
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119 | * validated and parsed later. |
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120 | * @param stream the InputStream to read the certificate from. |
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121 | * @return the parsed XML document |
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122 | * @throws IOException if the stream is unparsable |
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123 | */ |
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124 | static protected Document read_certificate(InputStream stream) |
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125 | throws IOException { |
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126 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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127 | DocumentBuilder db = null; |
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128 | Document ldoc = null; |
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129 | |
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130 | if ( dbf == null ) |
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131 | throw new IOException("Cannot get DocumentBuilderFactory!?"); |
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132 | try { |
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133 | /* Note this setting is required to find the properly |
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134 | * namespace-scoped signature block in the credential. |
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135 | */ |
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136 | dbf.setNamespaceAware(true); |
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137 | if ( (db = dbf.newDocumentBuilder()) == null ) |
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138 | throw new IOException("Cannot get DocumentBuilder!?"); |
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139 | ldoc = db.parse(stream); |
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140 | ldoc.normalizeDocument(); |
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141 | return ldoc; |
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142 | } |
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143 | catch (IllegalArgumentException ie) { |
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144 | throw new IOException("null stream", ie); |
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145 | } |
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146 | catch (SAXException se) { |
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147 | throw new IOException(se.getMessage(), se); |
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148 | } |
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149 | catch (Exception e) { |
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150 | throw new IOException(e.getMessage(), e); |
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151 | } |
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152 | |
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153 | } |
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154 | |
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155 | /** |
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156 | * Walk the document and set all instances of an xml:id attribute to be ID |
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157 | * attributes in terms of the java libraries. This is needed for the |
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158 | * signature code to find signed subsections. The "xml:id" is treated as |
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159 | * both a namespace free ID with a colon and as an "id" identifier in the |
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160 | * "xml" namespace so we don't miss it. |
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161 | * @param n the root of the document to mark |
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162 | */ |
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163 | static protected void setIDAttrs(Node n) { |
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164 | if ( n.getNodeType() == Node.ELEMENT_NODE) { |
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165 | Element e = (Element) n; |
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166 | String id = e.getAttribute("xml:id"); |
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167 | |
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168 | if ( id != null && id.length() > 0 ) |
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169 | e.setIdAttribute("xml:id", true); |
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170 | |
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171 | id = e.getAttributeNS("xml", "id"); |
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172 | if ( id != null && id.length() > 0 ) |
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173 | e.setIdAttributeNS("xml", "id", true); |
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174 | } |
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175 | |
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176 | for (Node nn = n.getFirstChild(); nn != null; nn = nn.getNextSibling()) |
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177 | setIDAttrs(nn); |
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178 | } |
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179 | |
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180 | /** |
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181 | * Return the child of Node n that has the given name, if there is one. |
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182 | * @param n a Node to search |
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183 | * @param name the name to search for |
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184 | * @return a Node with the name, may be null |
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185 | */ |
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186 | static protected Node getChildByName(Node n, String name) { |
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187 | if (name == null ) return null; |
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188 | |
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189 | for (Node nn = n.getFirstChild(); nn != null; nn = nn.getNextSibling()) |
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190 | if ( nn.getNodeType() == Node.ELEMENT_NODE && |
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191 | name.equals(nn.getNodeName())) return nn; |
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192 | return null; |
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193 | } |
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194 | |
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195 | /** |
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196 | * Find the X509Certificate in the Signature element and convert it to an |
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197 | * ABAC identity. This assumes a KeyInfo in that section holding an |
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198 | * X509Data section containing the certificate in an X509Certificate |
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199 | * section. Any of that not being found will cause a failure. If the |
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200 | * Identity cannot be created a Gignature exception is thrown. |
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201 | * @param n a Node pointing to a Signature section |
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202 | * @return an Identity constructed frm the X509 Certificate |
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203 | * @throws MissingIssuerException if the Identity cannot be created from the |
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204 | * certificate. |
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205 | */ |
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206 | static protected Identity getIdentity(Node n) |
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207 | throws MissingIssuerException { |
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208 | Identity rv = null; |
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209 | Node nn = getChildByName(n, "KeyInfo"); |
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210 | String certStr = null; |
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211 | |
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212 | if ( nn == null ) return null; |
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213 | if ( ( nn = getChildByName(nn, "X509Data")) == null ) return null; |
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214 | if ( ( nn = getChildByName(nn, "X509Certificate")) == null ) return null; |
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215 | if ( ( certStr = nn.getTextContent()) == null ) return null; |
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216 | try { |
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217 | certStr = "-----BEGIN CERTIFICATE-----\n" + |
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218 | certStr + |
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219 | "\n-----END CERTIFICATE-----"; |
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220 | return new Identity(new StringReader(certStr)); |
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221 | } |
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222 | catch (Exception e) { |
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223 | throw new MissingIssuerException(e.getMessage(), e); |
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224 | } |
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225 | } |
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226 | |
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227 | /** |
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228 | * Initialize a credential from parsed certificate. Validiate it against |
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229 | * the given identities and parse out the roles. Note that catching |
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230 | * java.security.GeneralSecurityException catches most of the exceptions |
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231 | * this throws. |
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232 | * @param ids a Collection of Identities to use in validating the cert |
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233 | * @throws CertInvalidException if the stream is unparsable |
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234 | * @throws MissingIssuerException if none of the Identities can validate the |
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235 | * certificate |
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236 | * @throws BadSignatureException if the signature check fails |
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237 | */ |
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238 | protected void init(Collection<Identity> ids) |
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239 | throws ABACException { |
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240 | |
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241 | XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM"); |
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242 | NodeList nl = doc.getElementsByTagNameNS(XMLSignature.XMLNS, |
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243 | "Signature"); |
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244 | DOMValidateContext valContext = null; |
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245 | XMLSignature signature = null; |
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246 | |
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247 | try { |
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248 | |
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249 | if (nl.getLength() == 0) |
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250 | throw new CertInvalidException("Cannot find Signature element"); |
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251 | |
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252 | setIDAttrs(doc); |
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253 | valContext = new DOMValidateContext(new X509KeySelector(), |
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254 | nl.item(0)); |
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255 | if ( valContext == null ) |
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256 | throw new ABACException("No validation context!?"); |
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257 | |
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258 | signature = fac.unmarshalXMLSignature(valContext); |
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259 | if (signature == null) |
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260 | throw new BadSignatureException("Cannot unmarshal signature"); |
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261 | |
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262 | if (!signature.validate(valContext)) |
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263 | throw new BadSignatureException("bad signature"); |
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264 | |
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265 | load_roles(); |
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266 | |
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267 | id = getIdentity(nl.item(0)); |
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268 | |
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269 | if ( !ids.contains(id) ) ids.add(id); |
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270 | |
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271 | if (!id.getKeyID().equals(m_head.principal())) |
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272 | throw new MissingIssuerException("Issuer ID and left hand " + |
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273 | "side principal disagree"); |
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274 | } |
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275 | catch (ABACException ae) { |
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276 | throw ae; |
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277 | } |
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278 | catch (Exception e) { |
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279 | throw new BadSignatureException(e.getMessage(), e); |
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280 | } |
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281 | } |
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282 | |
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283 | /** |
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284 | * Parse a credential from an InputStream and initialize the role from it. |
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285 | * Combine read_credential(stream) and init(ids). Note that catching |
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286 | * java.security.GeneralSecurityException catches most of the exceptions |
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287 | * this throws. |
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288 | * @param stream the InputStream to read the certificate from. |
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289 | * @param ids a Collection of Identities to use in validating the cert |
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290 | * @throws CertInvalidException if the stream is unparsable |
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291 | * @throws MissingIssuerException if none of the Identities can validate the |
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292 | * certificate |
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293 | * @throws BadSignatureException if the signature check fails |
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294 | */ |
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295 | protected void init(InputStream stream, Collection<Identity> ids) |
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296 | throws ABACException { |
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297 | try { |
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298 | doc = read_certificate(stream); |
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299 | } |
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300 | catch (IOException e) { |
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301 | throw new CertInvalidException("Cannot parse cert", e); |
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302 | } |
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303 | if (doc == null) throw new CertInvalidException("Unknown Format"); |
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304 | init(ids); |
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305 | } |
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306 | |
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307 | /** |
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308 | * Create a credential from an attribute cert in a file. Throws an |
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309 | * exception if the cert file can't be opened or if there's a format |
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310 | * problem with the cert. Note that catching |
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311 | * java.security.GeneralSecurityException catches most of the exceptions |
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312 | * this throws. |
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313 | * @param filename a String containing the filename to read |
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314 | * @param ids a Collection of Identities to use in validating the cert |
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315 | * @throws CertInvalidException if the stream is unparsable |
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316 | * @throws MissingIssuerException if none of the Identities can validate the |
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317 | * certificate |
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318 | * @throws BadSignatureException if the signature check fails |
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319 | */ |
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320 | GENICredential(String filename, Collection<Identity> ids) |
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321 | throws ABACException { |
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322 | try { |
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323 | init(new FileInputStream(filename), ids); |
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324 | } |
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325 | catch (FileNotFoundException e) { |
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326 | throw new CertInvalidException("Bad filename", e); |
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327 | } |
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328 | } |
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329 | |
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330 | /** |
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331 | * Create a credential from an attribute cert in a file. Throws an |
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332 | * exception if the cert file can't be opened or if there's a format |
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333 | * problem with the cert. Note that catching |
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334 | * java.security.GeneralSecurityException catches most of the exceptions |
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335 | * this throws. |
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336 | * @param file the File to read |
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337 | * @param ids a Collection of Identities to use in validating the cert |
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338 | * @throws CertInvalidException if the stream is unparsable |
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339 | * @throws MissingIssuerException if none of the Identities can validate the |
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340 | * certificate |
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341 | * @throws BadSignatureException if the signature check fails |
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342 | */ |
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343 | GENICredential(File file, Collection<Identity> ids) |
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344 | throws ABACException { |
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345 | try { |
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346 | init(new FileInputStream(file), ids); |
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347 | } |
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348 | catch (FileNotFoundException e) { |
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349 | throw new CertInvalidException("Bad filename", e); |
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350 | } |
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351 | } |
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352 | |
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353 | /** |
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354 | * Create a credential from an InputStream. Throws an exception if the |
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355 | * stream can't be parsed or if there's a format problem with the cert. |
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356 | * Note that catching java.security.GeneralSecurityException catches most |
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357 | * of the exceptions this throws. |
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358 | * @param s the InputStream to read |
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359 | * @param ids a Collection of Identities to use in validating the cert |
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360 | * @throws CertInvalidException if the stream is unparsable |
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361 | * @throws MissingIssuerException if none of the Identities can validate the |
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362 | * certificate |
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363 | * @throws BadSignatureException if the signature check fails |
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364 | */ |
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365 | GENICredential(InputStream s, Collection<Identity> ids) |
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366 | throws ABACException { init(s, ids); } |
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367 | |
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368 | /** |
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369 | * Encode the abac credential's XML. This is straight line code that |
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370 | * directly builds the credential. |
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371 | * @return a Node, the place to attach signatures |
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372 | * @throws ABACException if any of the XML construction fails |
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373 | */ |
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374 | protected Node make_rt0_content() throws ABACException { |
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375 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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376 | DocumentBuilder db = null; |
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377 | SimpleDateFormat df = new SimpleDateFormat("yyy-MM-dd'T'HH:mm:ss'Z'"); |
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378 | StringBuffer expBuf = new StringBuffer(); |
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379 | |
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380 | /* This is a weirdness to cope with the GENI format. They have a naked |
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381 | * xml:id specifier without any namespace declarations in the |
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382 | * credential. Notice that this is the opposite of the setting used in |
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383 | * init to read a credential. */ |
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384 | dbf.setNamespaceAware(false); |
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385 | |
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386 | if ( dbf == null ) |
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387 | throw new ABACException("Cannot get DocumentBuilderFactory!?"); |
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388 | |
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389 | try { |
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390 | db = dbf.newDocumentBuilder(); |
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391 | } |
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392 | catch (ParserConfigurationException pe) { |
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393 | throw new ABACException("Cannot get DocumentBuilder!?" + |
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394 | pe.getMessage(), pe); |
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395 | } |
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396 | |
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397 | doc = db.newDocument(); |
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398 | if ( doc == null ) |
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399 | throw new ABACException("No Document"); |
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400 | |
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401 | Element root = doc.createElement("signed-credential"); |
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402 | Element cred = doc.createElement("credential"); |
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403 | Element sig = doc.createElement("signatures"); |
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404 | Element e = doc.createElement("type"); |
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405 | Node text = doc.createTextNode("abac"); |
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406 | |
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407 | doc.appendChild(root); |
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408 | |
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409 | cred.setAttribute("xml:id", "ref0"); |
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410 | /* So that the signing code can find the section to sign */ |
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411 | cred.setIdAttribute("xml:id", true); |
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412 | |
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413 | root.appendChild(cred); |
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414 | e.appendChild(text); |
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415 | cred.appendChild(e); |
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416 | |
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417 | /* XXX: pass in valid time */ |
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418 | df.format(new Date(System.currentTimeMillis() |
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419 | + (3600L * 1000L * 24L * 365L)), expBuf, |
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420 | new FieldPosition(0)); |
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421 | e = doc.createElement("expires"); |
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422 | text = doc.createTextNode(expBuf.toString()); |
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423 | e.appendChild(text); |
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424 | cred.appendChild(e); |
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425 | |
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426 | e = doc.createElement("version"); |
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427 | text = doc.createTextNode("1.0"); |
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428 | e.appendChild(text); |
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429 | cred.appendChild(e); |
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430 | |
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431 | e = doc.createElement("rt0"); |
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432 | text = doc.createTextNode(m_head + "<-" + m_tail); |
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433 | e.appendChild(text); |
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434 | cred.appendChild(e); |
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435 | |
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436 | root.appendChild(sig); |
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437 | return sig; |
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438 | } |
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439 | |
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440 | /** |
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441 | * Create a certificate from this credential issued by the given identity. |
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442 | * This is the signed XML ABAC credential. |
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443 | * @param i the Identity that will issue the certificate |
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444 | * @throws ABACException if xml creation fails |
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445 | * @throws MissingIssuerException if the issuer is bad |
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446 | * @throws BadSignatureException if the signature creation fails |
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447 | */ |
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448 | public void make_cert(Identity i) |
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449 | throws ABACException { |
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450 | X509Certificate cert = i.getCertificate(); |
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451 | KeyPair kp = i.getKeyPair(); |
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452 | PublicKey pubKey = null; |
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453 | PrivateKey privKey = null; |
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454 | if ( cert == null ) |
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455 | throw new MissingIssuerException("No credential in identity?"); |
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456 | if ( kp == null ) |
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457 | throw new MissingIssuerException("No keypair in identity?"); |
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458 | |
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459 | pubKey = kp.getPublic(); |
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460 | if ((privKey = kp.getPrivate()) == null ) |
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461 | throw new MissingIssuerException("No private ket in identity"); |
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462 | |
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463 | XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM"); |
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464 | Reference ref = null; |
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465 | SignedInfo si = null; |
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466 | KeyInfoFactory kif = fac.getKeyInfoFactory(); |
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467 | |
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468 | /* The <Object> doesn't say much, but shuts the compiler up about |
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469 | * unchecked references. The lists are polymorphyc and the signature |
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470 | * libs expect that, so <Object> is the best we can do. |
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471 | */ |
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472 | List<Object> x509Content = new ArrayList<Object>(); |
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473 | List<Object> keyInfo = new ArrayList<Object>(); |
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474 | x509Content.add(cert.getSubjectX500Principal().getName()); |
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475 | x509Content.add(cert); |
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476 | X509Data xd = kif.newX509Data(x509Content); |
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477 | KeyValue kv = null; |
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478 | |
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479 | try { |
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480 | kv = kif.newKeyValue(pubKey); |
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481 | } |
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482 | catch (KeyException ke) { |
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483 | throw new ABACException("Unsupported key format " + |
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484 | ke.getMessage(), ke); |
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485 | } |
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486 | |
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487 | Collections.addAll(keyInfo, kv, xd); |
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488 | |
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489 | KeyInfo ki = kif.newKeyInfo(keyInfo); |
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490 | Node sig = make_rt0_content(); |
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491 | |
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492 | try { |
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493 | ref = fac.newReference("#ref0", |
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494 | fac.newDigestMethod(DigestMethod.SHA1, null), |
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495 | Collections.singletonList( |
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496 | fac.newTransform(Transform.ENVELOPED, |
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497 | (TransformParameterSpec) null)), |
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498 | null, null); |
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499 | |
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500 | si = fac.newSignedInfo( |
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501 | fac.newCanonicalizationMethod( |
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502 | CanonicalizationMethod.INCLUSIVE, |
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503 | (C14NMethodParameterSpec) null), |
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504 | fac.newSignatureMethod(SignatureMethod.RSA_SHA1, null), |
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505 | Collections.singletonList(ref)); |
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506 | |
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507 | DOMSignContext dsc = new DOMSignContext(privKey, sig); |
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508 | XMLSignature signature = fac.newXMLSignature(si, ki); |
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509 | signature.sign(dsc); |
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510 | } |
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511 | catch (Exception me) { |
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512 | throw new BadSignatureException(me.getMessage(), me); |
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513 | } |
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514 | |
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515 | } |
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516 | |
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517 | /** |
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518 | * Load the roles off the attribute cert. |
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519 | * @throws CertInvalidException if the certificate is badly formatted |
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520 | */ |
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521 | private void load_roles() throws CertInvalidException { |
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522 | if ( doc == null ) |
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523 | throw new CertInvalidException("No credential"); |
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524 | |
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525 | String roles = null; |
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526 | NodeList nodes = doc.getElementsByTagName("rt0"); |
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527 | |
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528 | if (nodes == null || nodes.getLength() != 1) |
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529 | throw new CertInvalidException("More than one rt0 element?"); |
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530 | |
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531 | Node node = nodes.item(0); |
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532 | |
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533 | if ( node == null ) |
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534 | throw new CertInvalidException("bad rt0 element?"); |
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535 | |
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536 | if ( (roles = node.getTextContent()) == null ) |
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537 | throw new CertInvalidException("bad rt0 element (no text)?"); |
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538 | |
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539 | String[] parts = roles.split("\\s*<--?\\s*"); |
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540 | if (parts.length != 2) |
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541 | throw new CertInvalidException("Invalid attribute: " + roles); |
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542 | |
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543 | m_head = new Role(parts[0]); |
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544 | m_tail = new Role(parts[1]); |
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545 | } |
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546 | |
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547 | /** |
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548 | * Output the signed GENI ABAC certificate associated with this |
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549 | * Credential to the OutputStream. |
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550 | * @param s the OutputStream on which to write |
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551 | * @throws IOException if there is an error writing. |
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552 | */ |
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553 | public void write(OutputStream s) throws IOException { |
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554 | if ( doc == null ) |
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555 | return; |
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556 | try { |
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557 | TransformerFactory tf = TransformerFactory.newInstance(); |
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558 | Transformer t = tf.newTransformer(); |
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559 | DOMSource source = new DOMSource(doc); |
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560 | StreamResult result = new StreamResult(s); |
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561 | |
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562 | t.transform(source, result); |
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563 | s.flush(); |
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564 | } |
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565 | catch (Exception e) { |
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566 | throw new IOException(e.getMessage(), e); |
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567 | } |
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568 | } |
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569 | /** |
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570 | * Output the signed GENI ABAC certificate associated with this |
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571 | * Credential to the OutputStream. |
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572 | * @param fn a String, the file name on which to write |
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573 | * @throws IOException if there is an error writing. |
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574 | * @throws FileNotFoundExeption if the file path is bogus |
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575 | */ |
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576 | public void write(String fn) throws IOException, FileNotFoundException { |
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577 | write(new FileOutputStream(fn)); |
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578 | } |
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579 | |
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580 | /** |
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581 | * Return true if this Credential has a certificate associated. A jabac |
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582 | * extension. |
---|
583 | * @return true if this Credential has a certificate associated. |
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584 | */ |
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585 | public boolean hasCertificate() { return doc != null; } |
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586 | |
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587 | /** |
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588 | * Return a CredentialCredentialFactorySpecialization for GENICredentials. |
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589 | * Used by the CredentialFactory to parse and generate these kind of |
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590 | * credentials. It basically wraps constuctor calls. |
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591 | * @return a CredentialFactorySpecialization for this kind of credential. |
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592 | */ |
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593 | static public CredentialFactorySpecialization |
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594 | getCredentialFactorySpecialization() { |
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595 | return new CredentialFactorySpecialization() { |
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596 | public Credential[] parseCredential(InputStream is, |
---|
597 | Collection<Identity> ids) throws ABACException { |
---|
598 | return new Credential[] { new GENICredential(is, ids) }; |
---|
599 | } |
---|
600 | public Credential generateCredential(Role head, Role tail) { |
---|
601 | return new GENICredential(head, tail); |
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602 | } |
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603 | }; |
---|
604 | } |
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605 | } |
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