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 | |
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6 | import java.util.*; |
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7 | import java.util.zip.*; |
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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 net.deterlab.abac.Identity; |
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12 | |
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13 | import org.bouncycastle.asn1.*; |
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14 | import org.bouncycastle.asn1.x509.*; |
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15 | import org.bouncycastle.x509.*; |
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16 | import org.bouncycastle.jce.X509Principal; |
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17 | import org.bouncycastle.jce.provider.X509AttrCertParser; |
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18 | import org.bouncycastle.jce.provider.X509CertificateObject; |
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19 | import org.bouncycastle.openssl.PEMReader; |
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20 | |
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21 | import java.security.PrivateKey; |
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22 | |
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23 | public class Credential implements Comparable { |
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24 | protected static Vector<Identity> s_ids = new Vector<Identity>(); |
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25 | protected static String attrOID = "1.3.6.1.5.5.7.10.4"; |
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26 | protected static String authKeyOID = "2.5.29.35"; |
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27 | |
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28 | /** |
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29 | * A dummy credential. |
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30 | */ |
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31 | public Credential() { |
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32 | m_head = m_tail = null; |
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33 | m_ac = null; |
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34 | m_id = null; |
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35 | } |
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36 | /** |
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37 | * Create a credential from a head and tail role. This is only for testing. |
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38 | * In a real implementation the Credential must be loaded from an X.509 |
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39 | * attribute cert. |
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40 | */ |
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41 | public Credential(Role head, Role tail) { |
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42 | m_head = head; |
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43 | m_tail = tail; |
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44 | m_ac = null; |
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45 | m_id = null; |
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46 | } |
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47 | |
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48 | /** |
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49 | * Do the credential initialization from a filename. |
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50 | */ |
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51 | protected void init(InputStream stream) throws Exception { |
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52 | X509AttrCertParser parser = new X509AttrCertParser(); |
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53 | parser.engineInit(stream); |
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54 | m_ac = (X509V2AttributeCertificate)parser.engineRead(); |
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55 | m_id = null; |
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56 | |
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57 | if ( m_ac == null ) throw new IOException("Invalid Credential Format"); |
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58 | |
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59 | for (Identity id: s_ids) { |
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60 | try { |
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61 | m_ac.verify(id.getCertificate().getPublicKey(), "BC"); |
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62 | m_id = id; |
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63 | break; |
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64 | } |
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65 | catch (InvalidKeyException e) { } |
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66 | } |
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67 | if (m_id == null) throw new InvalidKeyException("Unknown identity"); |
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68 | |
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69 | load_roles(); |
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70 | |
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71 | if (!m_id.getKeyID().equals(m_head.issuer_part())) |
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72 | throw new InvalidKeyException("Unknown identity"); |
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73 | } |
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74 | |
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75 | /** |
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76 | * Create a credential from an attribute cert. Throws an exception if the |
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77 | * cert file can't be opened or if there's a format problem with the cert. |
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78 | */ |
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79 | public Credential(String filename) throws Exception { |
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80 | init(new FileInputStream(filename)); |
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81 | } |
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82 | |
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83 | /** |
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84 | * Create a credential from an attribute cert. Throws an exception if the |
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85 | * cert file can't be opened or if there's a format problem with the cert. |
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86 | */ |
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87 | public Credential(File file) throws Exception { |
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88 | init(new FileInputStream(file)); |
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89 | } |
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90 | |
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91 | /** |
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92 | * Create a credential from an InputStream. |
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93 | */ |
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94 | public Credential(InputStream s) throws Exception { |
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95 | init(s); |
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96 | } |
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97 | |
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98 | /** |
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99 | * Create a certificate from this credential issued by the given identity. |
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100 | * This is just grungy credential generation work. |
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101 | */ |
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102 | public void make_cert(Identity i) { |
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103 | PrivateKey key = i.getKeyPair().getPrivate(); |
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104 | SubjectPublicKeyInfo pki = Identity.extractSubjectPublicKeyInfo( |
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105 | i.getKeyPair().getPublic()); |
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106 | X509V2AttributeCertificateGenerator gen = |
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107 | new X509V2AttributeCertificateGenerator(); |
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108 | |
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109 | gen.setIssuer(new AttributeCertificateIssuer( |
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110 | new X509Principal("CN="+m_head.issuer_part()))); |
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111 | gen.setHolder(new AttributeCertificateHolder( |
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112 | new X509Principal("CN="+m_head.issuer_part()))); |
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113 | gen.setNotAfter(new Date(System.currentTimeMillis() |
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114 | + 3600 * 1000 * 24 * 365)); |
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115 | gen.setNotBefore(new Date(System.currentTimeMillis())); |
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116 | gen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis())); |
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117 | gen.addAttribute(new X509Attribute(attrOID, |
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118 | new DERSequence( |
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119 | new DERSequence( |
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120 | new DERUTF8String(toString()))))); |
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121 | gen.setSignatureAlgorithm("SHA256WithRSAEncryption"); |
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122 | |
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123 | try { |
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124 | // Creddy expects an authority key identifier. |
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125 | gen.addExtension(authKeyOID, false, |
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126 | new AuthorityKeyIdentifier(pki)); |
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127 | // Create the cert. |
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128 | m_ac = (X509V2AttributeCertificate) gen.generate(key, "BC"); |
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129 | } |
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130 | catch (Exception e) { |
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131 | System.err.println(e); |
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132 | } |
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133 | } |
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134 | |
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135 | /** |
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136 | * Load the roles off the attribute cert. Throws a RuntimeException if |
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137 | * there's something wrong with the cert. |
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138 | */ |
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139 | private void load_roles() throws RuntimeException { |
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140 | String roles = null; |
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141 | try { |
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142 | X509Attribute attr = m_ac.getAttributes()[0]; |
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143 | |
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144 | DERSequence java = (DERSequence)attr.getValues()[0]; |
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145 | DERSequence fucking = (DERSequence)java.getObjectAt(0); |
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146 | DERUTF8String sucks = (DERUTF8String)fucking.getObjectAt(0); |
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147 | |
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148 | roles = sucks.getString(); |
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149 | } |
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150 | catch (Exception e) { |
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151 | throw new RuntimeException("Your attribute certificate is funky and I'm not gonna debug it", e); |
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152 | } |
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153 | |
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154 | String[] parts = roles.split("\\s*<--?\\s*"); |
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155 | if (parts.length != 2) |
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156 | throw new RuntimeException("Invalid attribute: " + roles); |
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157 | |
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158 | m_head = new Role(parts[0]); |
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159 | m_tail = new Role(parts[1]); |
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160 | } |
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161 | |
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162 | /** |
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163 | * Two credentials are the same if their roles are the same. |
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164 | */ |
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165 | public boolean equals(Object o) { |
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166 | if ( o instanceof Credential ) { |
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167 | Credential c = (Credential) o; |
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168 | |
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169 | if (m_head == null || m_tail == null ) return false; |
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170 | else return (m_head.equals(c.head()) && m_tail.equals(c.tail())); |
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171 | } |
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172 | else return false; |
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173 | } |
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174 | |
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175 | public int compareTo(Object o) { |
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176 | if (o instanceof Credential) { |
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177 | Credential c = (Credential) o; |
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178 | |
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179 | if (head().equals(c.head())) return tail().compareTo(c.tail()); |
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180 | else return head().compareTo(c.head()); |
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181 | } |
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182 | else return 1; |
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183 | } |
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184 | |
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185 | |
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186 | /** |
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187 | * Get the head role from the credential. |
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188 | */ |
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189 | public Role head() { |
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190 | return m_head; |
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191 | } |
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192 | |
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193 | /** |
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194 | * Get the tail role from the credential |
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195 | */ |
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196 | public Role tail() { |
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197 | return m_tail; |
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198 | } |
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199 | |
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200 | /** |
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201 | * Gets the cert associated with this credential (if any). |
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202 | */ |
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203 | public X509V2AttributeCertificate cert() { |
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204 | return m_ac; |
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205 | } |
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206 | |
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207 | /** |
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208 | * Turn the credential into string form. The format is head <- tail. For |
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209 | * example: A.r1 <- B.r2.r3. |
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210 | */ |
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211 | public String toString() { |
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212 | return m_head + " <- " + m_tail; |
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213 | } |
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214 | |
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215 | public String simpleString() { |
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216 | return m_head.simpleString() + " <- " + m_tail.simpleString(); |
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217 | } |
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218 | |
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219 | public void write(OutputStream s) throws IOException { |
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220 | s.write(m_ac.getEncoded()); |
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221 | s.flush(); |
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222 | } |
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223 | |
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224 | public void write(String fn) throws IOException, FileNotFoundException { |
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225 | write(new FileOutputStream(fn)); |
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226 | } |
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227 | |
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228 | public boolean hasCertificate() { return m_ac != null; } |
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229 | |
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230 | public Identity getID() { return m_id; } |
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231 | |
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232 | /** |
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233 | * Import a zip file. First import all the identities |
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234 | * (pem), then the credentials (der) into the credential graph then any |
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235 | * alias files into the two maps. If keys is not null, any key pairs in |
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236 | * PEM files are put in there. If errors is not null, errors reading files |
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237 | * are added indexed by filename. |
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238 | */ |
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239 | static public Collection<Credential> readZipFile(File zf, |
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240 | Collection<KeyPair> keys, Map<String, Exception> errors) |
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241 | throws IOException { |
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242 | Vector<Credential> creds = new Vector<Credential>(); |
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243 | Vector<ZipEntry> derEntries = new Vector<ZipEntry>(); |
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244 | Map<String, Identity> ids = new TreeMap<String, Identity>(); |
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245 | Map<String, KeyPair> kps = new TreeMap<String, KeyPair>(); |
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246 | |
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247 | ZipFile z = new ZipFile(zf); |
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248 | |
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249 | for (Enumeration<? extends ZipEntry> ze = z.entries(); |
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250 | ze.hasMoreElements();) { |
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251 | ZipEntry f = ze.nextElement(); |
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252 | try { |
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253 | PEMReader r = new PEMReader( |
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254 | new InputStreamReader(z.getInputStream(f))); |
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255 | Object o = readPEM(r); |
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256 | |
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257 | if ( o != null ) { |
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258 | if (o instanceof Identity) { |
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259 | Identity i = (Identity) o; |
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260 | String kid = i.getKeyID(); |
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261 | |
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262 | if (kps.containsKey(kid) ) { |
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263 | i.setKeyPair(kps.get(kid)); |
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264 | kps.remove(kid); |
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265 | } |
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266 | else if (i.getKeyPair() == null ) |
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267 | ids.put(i.getKeyID(), i); |
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268 | |
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269 | Credential.addIdentity(i); |
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270 | } |
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271 | else if (o instanceof KeyPair ) { |
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272 | KeyPair kp = (KeyPair) o; |
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273 | String kid = Identity.extractKeyID(kp.getPublic()); |
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274 | |
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275 | if (ids.containsKey(kid)) { |
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276 | Identity i = ids.get(kid); |
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277 | |
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278 | i.setKeyPair(kp); |
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279 | ids.remove(kid); |
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280 | } |
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281 | else { |
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282 | kps.put(kid, kp); |
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283 | } |
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284 | } |
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285 | } |
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286 | else { |
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287 | // Not a PEM file |
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288 | derEntries.add(f); |
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289 | continue; |
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290 | } |
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291 | } |
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292 | catch (Exception e ) { |
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293 | if (errors != null ) errors.put(f.getName(), e); |
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294 | } |
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295 | } |
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296 | |
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297 | for ( ZipEntry f : derEntries ) { |
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298 | try { |
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299 | creds.add(new Credential(z.getInputStream(f))); |
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300 | } |
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301 | catch (Exception e ) { |
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302 | if (errors != null ) errors.put(f.getName(), e); |
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303 | } |
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304 | } |
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305 | return creds; |
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306 | } |
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307 | |
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308 | static public Collection<Credential> readZipFile(File d) |
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309 | throws IOException { |
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310 | return readZipFile(d, null, null); |
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311 | } |
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312 | static public Collection<Credential> readZipFile(File d, |
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313 | Map<String, Exception> errors) throws IOException { |
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314 | return readZipFile(d, null, errors); |
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315 | } |
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316 | static public Collection<Credential> readZipFile(File d, |
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317 | Collection<KeyPair> keys) throws IOException { |
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318 | return readZipFile(d, keys, null); |
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319 | } |
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320 | |
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321 | protected static Object readPEM(PEMReader r) throws IOException { |
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322 | Identity i = null; |
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323 | KeyPair keys = null; |
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324 | Object o = null; |
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325 | |
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326 | while ( (o = r.readObject()) != null ) { |
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327 | if (o instanceof X509CertificateObject) { |
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328 | if ( i == null ) { |
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329 | try { |
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330 | i = new Identity((X509CertificateObject)o); |
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331 | } |
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332 | catch (Exception e) { |
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333 | // Translate Idenitiy exceptions to IOException |
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334 | throw new IOException(e); |
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335 | } |
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336 | if (keys != null ) { |
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337 | i.setKeyPair(keys); |
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338 | keys = null; |
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339 | } |
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340 | } |
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341 | else throw new IOException("Two certificates"); |
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342 | } |
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343 | else if (o instanceof KeyPair ) { |
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344 | if ( i != null ) i.setKeyPair((KeyPair) o); |
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345 | else keys = (KeyPair) o; |
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346 | } |
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347 | else { |
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348 | throw new IOException("Unexpected PEM object: " + |
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349 | o.getClass().getName()); |
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350 | } |
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351 | } |
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352 | |
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353 | if ( i != null ) return i; |
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354 | else if ( keys != null) return keys; |
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355 | else return null; |
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356 | } |
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357 | |
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358 | /** |
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359 | * Import a directory full of files. First import all the identities |
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360 | * (pem), then the credentials (der) into the credential graph then any |
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361 | * alias files into the two maps. If keys is not null, any key pairs in |
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362 | * PEM files are put in there. If errors is not null, errors reading files |
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363 | * are added indexed by filename. |
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364 | */ |
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365 | static public Collection<Credential> readDirectory(File d, |
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366 | Collection<KeyPair> keys, Map<String, Exception> errors) { |
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367 | Vector<Credential> creds = new Vector<Credential>(); |
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368 | Vector<File> derFiles = new Vector<File>(); |
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369 | Collection<File> files = new Vector<File>(); |
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370 | Map<String, Identity> ids = new TreeMap<String, Identity>(); |
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371 | Map<String, KeyPair> kps = new TreeMap<String, KeyPair>(); |
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372 | |
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373 | if (d.isDirectory() ) |
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374 | for (File f : d.listFiles()) |
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375 | files.add(f); |
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376 | else files.add(d); |
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377 | |
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378 | for (File f: files ) { |
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379 | try { |
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380 | PEMReader r = new PEMReader(new FileReader(f)); |
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381 | Object o = readPEM(r); |
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382 | |
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383 | if ( o != null ) { |
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384 | if (o instanceof Identity) { |
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385 | Identity i = (Identity) o; |
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386 | String kid = i.getKeyID(); |
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387 | |
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388 | if (kps.containsKey(kid) ) { |
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389 | i.setKeyPair(kps.get(kid)); |
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390 | kps.remove(kid); |
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391 | } |
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392 | else if (i.getKeyPair() == null ) |
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393 | ids.put(i.getKeyID(), i); |
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394 | |
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395 | Credential.addIdentity(i); |
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396 | } |
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397 | else if (o instanceof KeyPair ) { |
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398 | KeyPair kp = (KeyPair) o; |
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399 | String kid = Identity.extractKeyID(kp.getPublic()); |
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400 | |
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401 | if (ids.containsKey(kid)) { |
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402 | Identity i = ids.get(kid); |
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403 | |
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404 | i.setKeyPair(kp); |
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405 | ids.remove(kid); |
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406 | } |
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407 | else { |
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408 | kps.put(kid, kp); |
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409 | } |
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410 | } |
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411 | } |
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412 | else { |
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413 | // Not a PEM file |
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414 | derFiles.add(f); |
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415 | continue; |
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416 | } |
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417 | } |
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418 | catch (Exception e ) { |
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419 | if (errors != null ) errors.put(f.getName(), e); |
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420 | } |
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421 | } |
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422 | |
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423 | for ( File f : derFiles ) { |
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424 | try { |
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425 | creds.add(new Credential(f)); |
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426 | } |
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427 | catch (Exception e ) { |
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428 | if (errors != null ) errors.put(f.getName(), e); |
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429 | } |
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430 | } |
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431 | return creds; |
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432 | } |
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433 | |
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434 | static public Collection<Credential> readDirectory(File d) { |
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435 | return readDirectory(d, null, null); |
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436 | } |
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437 | static public Collection<Credential> readDirectory(File d, |
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438 | Map<String, Exception> errors) { |
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439 | return readDirectory(d, null, errors); |
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440 | } |
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441 | static public Collection<Credential> readDirectory(File d, |
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442 | Collection<KeyPair> keys) { |
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443 | return readDirectory(d, keys, null); |
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444 | } |
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445 | |
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446 | static public void writeZipFile(Collection<Credential> creds, File f, |
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447 | boolean allIDs, boolean withPrivateKeys) |
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448 | throws IOException { |
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449 | ZipOutputStream z = new ZipOutputStream(new FileOutputStream(f)); |
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450 | Set<Identity> ids = allIDs ? |
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451 | new TreeSet<Identity>(s_ids) : new TreeSet<Identity>(); |
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452 | |
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453 | int n = 0; |
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454 | for (Credential c: creds) { |
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455 | z.putNextEntry(new ZipEntry("attr" + n++ + ".der")); |
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456 | c.write(z); |
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457 | z.closeEntry(); |
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458 | if ( c.getID() != null && !allIDs) ids.add(c.getID()); |
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459 | } |
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460 | for (Identity i: ids) { |
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461 | z.putNextEntry(new ZipEntry(i.getName() + ".pem")); |
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462 | i.write(z); |
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463 | if (withPrivateKeys) |
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464 | i.writePrivateKey(z); |
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465 | z.closeEntry(); |
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466 | } |
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467 | z.close(); |
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468 | } |
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469 | |
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470 | |
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471 | private Role m_head, m_tail; |
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472 | |
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473 | private X509V2AttributeCertificate m_ac; |
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474 | private Identity m_id; |
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475 | |
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476 | /** |
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477 | * Put the Identity into the set of ids used to validate certificates. |
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478 | * Also put the keyID and name into the translation mappings used by Roles |
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479 | * to pretty print. In the role mapping, if multiple ids use the same |
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480 | * common name they are disambiguated. Only one entry for keyid is |
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481 | * allowed. |
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482 | */ |
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483 | public static void addIdentity(Identity id) { |
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484 | s_ids.add(id); |
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485 | if (id.getName() != null && id.getKeyID() != null) { |
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486 | if ( !Role.key_in_mapping(id.getKeyID()) ) { |
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487 | String name = id.getName(); |
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488 | int n= 1; |
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489 | |
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490 | while (Role.name_in_mapping(name)) { |
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491 | name = id.getName() + n++; |
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492 | } |
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493 | Role.add_mapping(name, id.getKeyID()); |
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494 | } |
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495 | } |
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496 | } |
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497 | public static Collection<Identity> identities() { return s_ids; } |
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498 | public static void clearIdentities() { |
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499 | s_ids.clear(); Role.clear_mapping(); |
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500 | } |
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501 | } |
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