src/org/cacert/gigi/pages/account/certs/CertificateRequest.java

   1 package org.cacert.gigi.pages.account.certs;
   2
   3 import java.io.IOException;
   4 import java.io.PrintWriter;
   5 import java.security.GeneralSecurityException;
   6 import java.security.PublicKey;
   7 import java.security.interfaces.DSAPublicKey;
   8 import java.security.interfaces.ECPublicKey;
   9 import java.security.interfaces.RSAPublicKey;
  10 import java.util.Arrays;
  11 import java.util.Base64;
  12 import java.util.HashMap;
  13 import java.util.HashSet;
  14 import java.util.LinkedHashSet;
  15 import java.util.Set;
  16 import java.util.TreeSet;
  17
  18 import javax.servlet.http.HttpServletRequest;
  19
  20 import org.cacert.gigi.GigiApiException;
  21 import org.cacert.gigi.crypto.SPKAC;
  22 import org.cacert.gigi.dbObjects.Certificate;
  23 import org.cacert.gigi.dbObjects.Certificate.CSRType;
  24 import org.cacert.gigi.dbObjects.Certificate.SANType;
  25 import org.cacert.gigi.dbObjects.Certificate.SubjectAlternateName;
  26 import org.cacert.gigi.dbObjects.CertificateOwner;
  27 import org.cacert.gigi.dbObjects.CertificateProfile;
  28 import org.cacert.gigi.dbObjects.CertificateProfile.PropertyTemplate;
  29 import org.cacert.gigi.dbObjects.Digest;
  30 import org.cacert.gigi.dbObjects.Organisation;
  31 import org.cacert.gigi.dbObjects.User;
  32 import org.cacert.gigi.output.template.Scope;
  33 import org.cacert.gigi.output.template.SprintfCommand;
  34 import org.cacert.gigi.util.AuthorizationContext;
  35 import org.cacert.gigi.util.PEM;
  36 import org.cacert.gigi.util.RateLimit;
  37
  38 import sun.security.pkcs.PKCS9Attribute;
  39 import sun.security.pkcs10.PKCS10;
  40 import sun.security.pkcs10.PKCS10Attribute;
  41 import sun.security.pkcs10.PKCS10Attributes;
  42 import sun.security.util.DerInputStream;
  43 import sun.security.util.DerValue;
  44 import sun.security.util.ObjectIdentifier;
  45 import sun.security.x509.AVA;
  46 import sun.security.x509.AlgorithmId;
  47 import sun.security.x509.CertificateExtensions;
  48 import sun.security.x509.DNSName;
  49 import sun.security.x509.ExtendedKeyUsageExtension;
  50 import sun.security.x509.Extension;
  51 import sun.security.x509.GeneralName;
  52 import sun.security.x509.GeneralNameInterface;
  53 import sun.security.x509.GeneralNames;
  54 import sun.security.x509.PKIXExtensions;
  55 import sun.security.x509.RDN;
  56 import sun.security.x509.RFC822Name;
  57 import sun.security.x509.SubjectAlternativeNameExtension;
  58 import sun.security.x509.X500Name;
  59
  60 public class CertificateRequest {
  61
  62     public static final String DEFAULT_CN = "CAcert WoT User";
  63
  64     public static final ObjectIdentifier OID_KEY_USAGE_SSL_SERVER = ObjectIdentifier.newInternal(new int[] {
  65             1, 3, 6, 1, 5, 5, 7, 3, 1
  66     });
  67
  68     public static final ObjectIdentifier OID_KEY_USAGE_SSL_CLIENT = ObjectIdentifier.newInternal(new int[] {
  69             1, 3, 6, 1, 5, 5, 7, 3, 2
  70     });
  71
  72     public static final ObjectIdentifier OID_KEY_USAGE_CODESIGN = ObjectIdentifier.newInternal(new int[] {
  73             1, 3, 6, 1, 5, 5, 7, 3, 3
  74     });
  75
  76     public static final ObjectIdentifier OID_KEY_USAGE_EMAIL_PROTECTION = ObjectIdentifier.newInternal(new int[] {
  77             1, 3, 6, 1, 5, 5, 7, 3, 4
  78     });
  79
  80     public static final ObjectIdentifier OID_KEY_USAGE_TIMESTAMP = ObjectIdentifier.newInternal(new int[] {
  81             1, 3, 6, 1, 5, 5, 7, 3, 8
  82     });
  83
  84     public static final ObjectIdentifier OID_KEY_USAGE_OCSP = ObjectIdentifier.newInternal(new int[] {
  85             1, 3, 6, 1, 5, 5, 7, 3, 9
  86     });
  87
  88     private CSRType csrType;
  89
  90     private final PublicKey pk;
  91
  92     private String csr;
  93
  94     public String name = DEFAULT_CN;
  95
  96     private Set<SubjectAlternateName> SANs;
  97
  98     private Digest selectedDigest = Digest.getDefault();
  99
 100     private CertificateProfile profile = CertificateProfile.getById(1);
 101
 102     private String ou = "";
 103
 104     private AuthorizationContext ctx;
 105
 106     private String pDNS, pMail;
 107
 108     public CertificateRequest(AuthorizationContext c, String csr) throws IOException, GeneralSecurityException, GigiApiException {
 109         this(c, csr, (CertificateProfile) null);
 110     }
 111
 112     public CertificateRequest(AuthorizationContext ctx, String csr, CertificateProfile cp) throws GeneralSecurityException, IOException, IOException {
 113         this.ctx = ctx;
 114         if (cp != null) {
 115             profile = cp;
 116         } else if (ctx.getActor().getAssurancePoints() > 50) {
 117             profile = CertificateProfile.getByName("client-a");
 118         }
 119         byte[] data = PEM.decode("(NEW )?CERTIFICATE REQUEST", csr);
 120         PKCS10 parsed = new PKCS10(data);
 121         PKCS10Attributes atts = parsed.getAttributes();
 122
 123         TreeSet<SubjectAlternateName> SANs = new TreeSet<>();
 124         for (RDN r : parsed.getSubjectName().rdns()) {
 125             for (AVA a : r.avas()) {
 126                 if (a.getObjectIdentifier().equals((Object) PKCS9Attribute.EMAIL_ADDRESS_OID)) {
 127                     SANs.add(new SubjectAlternateName(SANType.EMAIL, a.getValueString()));
 128                 } else if (a.getObjectIdentifier().equals((Object) X500Name.commonName_oid)) {
 129                     String value = a.getValueString();
 130                     if (value.contains(".") && !value.contains(" ")) {
 131                         SANs.add(new SubjectAlternateName(SANType.DNS, value));
 132                     } else {
 133                         name = value;
 134                     }
 135                 } else if (a.getObjectIdentifier().equals((Object) PKIXExtensions.SubjectAlternativeName_Id)) {
 136                     // TODO? parse invalid SANs
 137                 }
 138             }
 139         }
 140
 141         for (PKCS10Attribute b : atts.getAttributes()) {
 142
 143             if ( !b.getAttributeId().equals((Object) PKCS9Attribute.EXTENSION_REQUEST_OID)) {
 144                 // unknown attrib
 145                 continue;
 146             }
 147
 148             for (Extension c : ((CertificateExtensions) b.getAttributeValue()).getAllExtensions()) {
 149                 if (c instanceof SubjectAlternativeNameExtension) {
 150
 151                     SubjectAlternativeNameExtension san = (SubjectAlternativeNameExtension) c;
 152                     GeneralNames obj = san.get(SubjectAlternativeNameExtension.SUBJECT_NAME);
 153                     for (int i = 0; i < obj.size(); i++) {
 154                         GeneralName generalName = obj.get(i);
 155                         GeneralNameInterface peeled = generalName.getName();
 156                         if (peeled instanceof DNSName) {
 157                             SANs.add(new SubjectAlternateName(SANType.DNS, ((DNSName) peeled).getName()));
 158                         } else if (peeled instanceof RFC822Name) {
 159                             SANs.add(new SubjectAlternateName(SANType.EMAIL, ((RFC822Name) peeled).getName()));
 160                         }
 161                     }
 162                 } else if (c instanceof ExtendedKeyUsageExtension) {
 163                     ExtendedKeyUsageExtension ekue = (ExtendedKeyUsageExtension) c;
 164                     String appendix = "";
 165                     if (ctx.getActor().getAssurancePoints() >= 50) {
 166                         appendix = "-a";
 167                     }
 168                     for (String s : ekue.getExtendedKeyUsage()) {
 169                         if (s.equals(OID_KEY_USAGE_SSL_SERVER.toString())) {
 170                             // server
 171                             profile = CertificateProfile.getByName("server" + appendix);
 172                         } else if (s.equals(OID_KEY_USAGE_SSL_CLIENT.toString())) {
 173                             // client
 174                             profile = CertificateProfile.getByName("client" + appendix);
 175                         } else if (s.equals(OID_KEY_USAGE_CODESIGN.toString())) {
 176                             // code sign
 177                         } else if (s.equals(OID_KEY_USAGE_EMAIL_PROTECTION.toString())) {
 178                             // emailProtection
 179                             profile = CertificateProfile.getByName("mail" + appendix);
 180                         } else if (s.equals(OID_KEY_USAGE_TIMESTAMP.toString())) {
 181                             // timestamp
 182                         } else if (s.equals(OID_KEY_USAGE_OCSP.toString())) {
 183                             // OCSP
 184                         }
 185                     }
 186                 } else {
 187                     // Unknown requested extension
 188                 }
 189             }
 190
 191         }
 192         this.SANs = SANs;
 193         pk = parsed.getSubjectPublicKeyInfo();
 194         String sign = getSignatureAlgorithm(data);
 195         guessDigest(sign);
 196
 197         this.csr = csr;
 198         this.csrType = CSRType.CSR;
 199     }
 200
 201     public CertificateRequest(AuthorizationContext ctx, String spkac, String spkacChallenge) throws IOException, GigiApiException, GeneralSecurityException {
 202         this.ctx = ctx;
 203         String cleanedSPKAC = spkac.replaceAll("[\r\n]", "");
 204         byte[] data = Base64.getDecoder().decode(cleanedSPKAC);
 205         SPKAC parsed = new SPKAC(data);
 206         if ( !parsed.getChallenge().equals(spkacChallenge)) {
 207             throw new GigiApiException("Challenge mismatch");
 208         }
 209         pk = parsed.getPubkey();
 210         String sign = getSignatureAlgorithm(data);
 211         guessDigest(sign);
 212         this.SANs = new HashSet<>();
 213         this.csr = "SPKAC=" + cleanedSPKAC;
 214         this.csrType = CSRType.SPKAC;
 215
 216     }
 217
 218     private static String getSignatureAlgorithm(byte[] data) throws IOException {
 219         DerInputStream in = new DerInputStream(data);
 220         DerValue[] seq = in.getSequence(3);
 221         return AlgorithmId.parse(seq[1]).getName();
 222     }
 223
 224     private void guessDigest(String sign) {
 225         if (sign.toLowerCase().startsWith("sha512")) {
 226             selectedDigest = Digest.SHA512;
 227         } else if (sign.toLowerCase().startsWith("sha384")) {
 228             selectedDigest = Digest.SHA384;
 229         }
 230     }
 231
 232     public void checkKeyStrength(PrintWriter out) {
 233         out.println("Type: " + pk.getAlgorithm() + "<br/>");
 234         if (pk instanceof RSAPublicKey) {
 235             out.println("Exponent: " + ((RSAPublicKey) pk).getPublicExponent() + "<br/>");
 236             out.println("Length: " + ((RSAPublicKey) pk).getModulus().bitLength());
 237         } else if (pk instanceof DSAPublicKey) {
 238             DSAPublicKey dpk = (DSAPublicKey) pk;
 239             out.println("Length: " + dpk.getY().bitLength() + "<br/>");
 240             out.println(dpk.getParams());
 241         } else if (pk instanceof ECPublicKey) {
 242             ECPublicKey epk = (ECPublicKey) pk;
 243             out.println("Length-x: " + epk.getW().getAffineX().bitLength() + "<br/>");
 244             out.println("Length-y: " + epk.getW().getAffineY().bitLength() + "<br/>");
 245             out.println(epk.getParams().getCurve());
 246         }
 247     }
 248
 249     private Set<SubjectAlternateName> parseSANBox(String SANs) {
 250         String[] SANparts = SANs.split("[\r\n]+|, *");
 251         Set<SubjectAlternateName> parsedNames = new LinkedHashSet<>();
 252         for (String SANline : SANparts) {
 253             String[] parts = SANline.split(":", 2);
 254             if (parts.length == 1) {
 255                 if (parts[0].trim().equals("")) {
 256                     continue;
 257                 }
 258                 if (parts[0].contains("@")) {
 259                     parsedNames.add(new SubjectAlternateName(SANType.EMAIL, parts[0]));
 260                 } else {
 261                     parsedNames.add(new SubjectAlternateName(SANType.DNS, parts[0]));
 262                 }
 263                 continue;
 264             }
 265             try {
 266                 SANType t = Certificate.SANType.valueOf(parts[0].toUpperCase().trim());
 267                 if (t == null) {
 268                     continue;
 269                 }
 270                 parsedNames.add(new SubjectAlternateName(t, parts[1].trim()));
 271             } catch (IllegalArgumentException e) {
 272                 // invalid enum type
 273                 continue;
 274             }
 275         }
 276         return parsedNames;
 277     }
 278
 279     public Set<SubjectAlternateName> getSANs() {
 280         return SANs;
 281     }
 282
 283     public String getName() {
 284         return name;
 285     }
 286
 287     public synchronized String getOu() {
 288         if (ctx.getTarget() instanceof Organisation) {
 289             return ou;
 290         }
 291         throw new IllegalStateException();
 292     }
 293
 294     public Digest getSelectedDigest() {
 295         return selectedDigest;
 296     }
 297
 298     public CertificateProfile getProfile() {
 299         return profile;
 300     }
 301
 302     public synchronized boolean update(String nameIn, String hashAlg, String profileStr, String newOrgStr, String ou, String SANsStr, PrintWriter out, HttpServletRequest req) throws GigiApiException {
 303         GigiApiException error = new GigiApiException();
 304         this.name = nameIn;
 305         if (hashAlg != null) {
 306             selectedDigest = Digest.valueOf(hashAlg);
 307         }
 308         this.profile = CertificateProfile.getByName(profileStr);
 309         if (ctx.getTarget() instanceof Organisation) {
 310             this.ou = ou;
 311         }
 312
 313         if ( !this.profile.canBeIssuedBy(ctx.getTarget(), ctx.getActor())) {
 314             this.profile = CertificateProfile.getById(1);
 315             error.mergeInto(new GigiApiException("Certificate Profile is invalid."));
 316             throw error;
 317         }
 318
 319         verifySANs(error, profile, parseSANBox(SANsStr), ctx.getTarget());
 320
 321         if ( !error.isEmpty()) {
 322             throw error;
 323         }
 324         return true;
 325     }
 326
 327     private void verifySANs(GigiApiException error, CertificateProfile p, Set<SubjectAlternateName> sANs2, CertificateOwner owner) {
 328         Set<SubjectAlternateName> filteredSANs = new LinkedHashSet<>();
 329         PropertyTemplate domainTemp = p.getTemplates().get("domain");
 330         PropertyTemplate emailTemp = p.getTemplates().get("email");
 331         pDNS = null;
 332         pMail = null;
 333         for (SubjectAlternateName san : sANs2) {
 334             if (san.getType() == SANType.DNS) {
 335                 if (domainTemp != null && owner.isValidDomain(san.getName())) {
 336                     if (pDNS != null && !domainTemp.isMultiple()) {
 337                         // remove
 338                     } else {
 339                         if (pDNS == null) {
 340                             pDNS = san.getName();
 341                         }
 342                         filteredSANs.add(san);
 343                         continue;
 344                     }
 345                 }
 346             } else if (san.getType() == SANType.EMAIL) {
 347                 if (emailTemp != null && owner.isValidEmail(san.getName())) {
 348                     if (pMail != null && !emailTemp.isMultiple()) {
 349                         // remove
 350                     } else {
 351                         if (pMail == null) {
 352                             pMail = san.getName();
 353                         }
 354                         filteredSANs.add(san);
 355                         continue;
 356                     }
 357                 }
 358             }
 359             HashMap<String, Object> vars = new HashMap<>();
 360             vars.put("SAN", san.getType().toString().toLowerCase() + ":" + san.getName());
 361             error.mergeInto(new GigiApiException(new Scope(new SprintfCommand(//
 362                     "The requested Subject alternate name \"{0}\" has been removed.", Arrays.asList("${SAN}")), vars)));
 363         }
 364         SANs = filteredSANs;
 365     }
 366
 367     // domain email name name=WoTUser orga
 368     public synchronized Certificate draft() throws GigiApiException {
 369
 370         GigiApiException error = new GigiApiException();
 371
 372         HashMap<String, String> subject = new HashMap<>();
 373         PropertyTemplate domainTemp = profile.getTemplates().get("domain");
 374         PropertyTemplate emailTemp = profile.getTemplates().get("email");
 375         PropertyTemplate nameTemp = profile.getTemplates().get("name");
 376         PropertyTemplate wotUserTemp = profile.getTemplates().get("name=WoTUser");
 377         verifySANs(error, profile, SANs, ctx.getTarget());
 378
 379         // Ok, let's determine the CN
 380         // the CN is
 381         // 1. the user's "real name", iff the real name is to be included i.e.
 382         // not empty (name), or to be forced to WOTUser
 383
 384         // 2. the user's "primary domain", iff "1." doesn't match and there is a
 385         // primary domain. (domainTemp != null)
 386
 387         String verifiedCN = null;
 388         if (ctx.getTarget() instanceof Organisation) {
 389             if ( !name.equals("")) {
 390                 verifiedCN = name;
 391             }
 392         } else {
 393             verifiedCN = verifyName(error, nameTemp, wotUserTemp, verifiedCN);
 394         }
 395         if (pDNS == null && domainTemp != null && domainTemp.isRequired()) {
 396             error.mergeInto(new GigiApiException("Server Certificates require a DNS name."));
 397         } else if (domainTemp != null && verifiedCN == null) {
 398             // user may add domains
 399             verifiedCN = pDNS;
 400         }
 401         if (verifiedCN != null) {
 402             subject.put("CN", verifiedCN);
 403         }
 404
 405         if (pMail != null) {
 406             if (emailTemp != null) {
 407                 subject.put("EMAIL", pMail);
 408             } else {
 409                 // verify SANs should prevent this
 410                 pMail = null;
 411                 error.mergeInto(new GigiApiException("You may not include an email in this certificate."));
 412             }
 413         } else {
 414             if (emailTemp != null && emailTemp.isRequired()) {
 415                 error.mergeInto(new GigiApiException("You need to include an email in this certificate."));
 416             }
 417         }
 418
 419         if (ctx.getTarget() instanceof Organisation) {
 420             Organisation org = (Organisation) ctx.getTarget();
 421             subject.put("O", org.getName());
 422             subject.put("C", org.getState());
 423             subject.put("ST", org.getProvince());
 424             subject.put("L", org.getCity());
 425             if (ou != null) {
 426                 subject.put("OU", ou);
 427             }
 428         }
 429         System.out.println(subject);
 430         if ( !error.isEmpty()) {
 431             throw error;
 432         }
 433         try {
 434             if (limit.isLimitExceeded(Integer.toString(ctx.getActor().getId()))) {
 435                 throw new GigiApiException("Rate Limit Exceeded");
 436             }
 437             return new Certificate(ctx.getTarget(), ctx.getActor(), subject, selectedDigest, //
 438                     this.csr, this.csrType, profile, SANs.toArray(new SubjectAlternateName[SANs.size()]));
 439         } catch (IOException e) {
 440             e.printStackTrace();
 441         }
 442         return null;
 443     }
 444
 445     // 100 per 10 minutes
 446     private static final RateLimit limit = new RateLimit(100, 10 * 60 * 1000);
 447
 448     private String verifyName(GigiApiException error, PropertyTemplate nameTemp, PropertyTemplate wotUserTemp, String verifiedCN) {
 449         // real names,
 450         // possible configurations: name {y,null,?}, name=WoTUser {y,null}
 451         // semantics:
 452         // y * -> real
 453         // null y -> default
 454         // null null -> null
 455         // ? y -> real, default
 456         // ? null -> real, default, null
 457         boolean realIsOK = false;
 458         boolean nullIsOK = false;
 459         boolean defaultIsOK = false;
 460         if (wotUserTemp != null && ( !wotUserTemp.isRequired() || wotUserTemp.isMultiple())) {
 461             error.mergeInto(new GigiApiException("Internal configuration error detected."));
 462         }
 463         if (nameTemp != null && nameTemp.isRequired() && !nameTemp.isMultiple()) {
 464             realIsOK = true;
 465         } else if (nameTemp == null) {
 466             defaultIsOK = wotUserTemp != null;
 467             nullIsOK = !defaultIsOK;
 468         } else if (nameTemp != null && !nameTemp.isRequired() && !nameTemp.isMultiple()) {
 469             realIsOK = true;
 470             defaultIsOK = true;
 471             nullIsOK = wotUserTemp == null;
 472         } else {
 473             error.mergeInto(new GigiApiException("Internal configuration error detected."));
 474         }
 475         if (ctx.getTarget() instanceof User) {
 476             User u = (User) ctx.getTarget();
 477             if (name != null && u.isValidName(name)) {
 478                 if (realIsOK) {
 479                     verifiedCN = name;
 480                 } else {
 481                     error.mergeInto(new GigiApiException("Your real name is not allowed in this certificate."));
 482                     if (defaultIsOK) {
 483                         name = DEFAULT_CN;
 484                     } else if (nullIsOK) {
 485                         name = "";
 486                     }
 487                 }
 488             } else if (name != null && name.equals(DEFAULT_CN)) {
 489                 if (defaultIsOK) {
 490                     verifiedCN = name;
 491                 } else {
 492                     error.mergeInto(new GigiApiException("The default name is not allowed in this certificate."));
 493                     if (nullIsOK) {
 494                         name = "";
 495                     } else if (realIsOK) {
 496                         name = u.getName().toString();
 497                     }
 498                 }
 499             } else if (name == null || name.equals("")) {
 500                 if (nullIsOK) {
 501                     verifiedCN = "";
 502                 } else {
 503                     error.mergeInto(new GigiApiException("A name is required in this certificate."));
 504                     if (defaultIsOK) {
 505                         name = DEFAULT_CN;
 506                     } else if (realIsOK) {
 507                         name = u.getName().toString();
 508                     }
 509                 }
 510             } else {
 511                 error.mergeInto(new GigiApiException("The name you entered was invalid."));
 512
 513             }
 514             if (wotUserTemp != null) {
 515                 if ( !wotUserTemp.isRequired() || wotUserTemp.isMultiple()) {
 516                     error.mergeInto(new GigiApiException("Internal configuration error detected."));
 517                 }
 518                 if ( !name.equals(DEFAULT_CN)) {
 519                     name = DEFAULT_CN;
 520                     error.mergeInto(new GigiApiException("You may not change the name for this certificate type."));
 521                 } else {
 522                     verifiedCN = DEFAULT_CN;
 523                 }
 524
 525             } else {
 526                 if (nameTemp != null) {
 527                     if (name.equals("")) {
 528                         if (nameTemp.isRequired()) {
 529                             // nothing, but required
 530                             name = DEFAULT_CN;
 531                             error.mergeInto(new GigiApiException("No name entered, but one was required."));
 532                         } else {
 533                             // nothing and not required
 534
 535                         }
 536                     } else if (u.isValidName(name)) {
 537                         verifiedCN = name;
 538                     } else {
 539                         if (nameTemp.isRequired()) {
 540                             error.mergeInto(new GigiApiException("The name entered, does not match the details in your account. You cannot issue certificates with this name. Enter a name that matches the one that has been assured in your account, because a name is required for this certificate type."));
 541                         } else if (name.equals(DEFAULT_CN)) {
 542                             verifiedCN = DEFAULT_CN;
 543                         } else {
 544                             name = DEFAULT_CN;
 545                             error.mergeInto(new GigiApiException("The name entered, does not match the details in your account. You cannot issue certificates with this name. Enter a name that matches the one that has been assured in your account or keep the default name."));
 546                         }
 547                     }
 548                 } else {
 549                     if ( !name.equals("")) {
 550                         name = "";
 551                         error.mergeInto(new GigiApiException("No real name is included in this certificate. The real name, you entered will be ignored."));
 552                     }
 553                 }
 554             }
 555         } else {
 556             if (realIsOK) {
 557                 verifiedCN = name;
 558             } else {
 559                 verifiedCN = "";
 560                 name = "";
 561                 error.mergeInto(new GigiApiException("No real name is included in this certificate. The real name, you entered will be ignored."));
 562             }
 563         }
 564
 565         return verifiedCN;
 566     }
 567 }