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#pike __REAL_VERSION__ 
 
//! 
//! Support for the Apple Keychain format. 
//! 
//! This is used for the files in eg @tt{/System/Library/Keychains@}. 
//! 
 
#ifdef APPLE_KEYCHAIN_DEBUG 
#define WERR(X ...) sprintf("Keychain: " X) 
#else 
#define WERR(X ...) 
#endif 
 
array(Standards.X509.TBSCertificate) certs = ({}); 
 
protected void create(string(8bit)|void keychain) 
{ 
  if (keychain) add_keychain(keychain); 
} 
 
protected Stdio.Buffer read_hbuffer(Stdio.Buffer in) 
{ 
  int len = in->read_int32(); 
  Stdio.Buffer ret = in->read_buffer(len - 4); 
  if (len & 0x03) { 
    int pad = in->read_int(4 - (len & 3)); 
    if (pad && (pad != -1)) { 
      werror("Unexpected content in padding: 0x%06x\n", pad); 
    } 
  } 
  return ret; 
} 
 
protected string(8bit) read_string(Stdio.Buffer in, int len) 
{ 
  string(8bit) res = in->read(len); 
  if (len & 3) { 
    int pad = in->read_int(4 - (len & 3)); 
    if (pad && (pad != -1)) { 
      werror("Unexpected content in padding: 0x%06x\n", pad); 
    } 
  } 
  return res; 
} 
 
protected void parse_cert(Stdio.Buffer buf) 
{ 
  if (sizeof(buf) < 8) return 0; 
 
  /* Each certificate has a header of 60 bytes: 
   * 
   * Offset 
   *   0:       INT32           0x05f4  Total length 
   *   4:       INT32           0x19    Certificate sequence number. 
   *   8:       INT32           0x1c    Unknown (probably some other certs #) 
   *   c:       INT32           0 
   *  10:       INT32BE         0x0436  Certificate DER length. 
   *  14:       INT32           0 
   *  18:       INT32BE         0x0475  Length + (0x75 - 0x36). 
   *  1c:       INT32BE         0x0479 
   *  20:       INT32BE         0x047d 
   *  24:       INT32BE         0x0499 
   *  28:       INT32BE         0x04b5 
   *  2c:       INT32BE         0x0539 
   *  30:       INT32BE         0x05bd 
   *  34:       INT32BE         0x05c5 
   *  38:       INT32BE         0x05dd 
   * 
   * All following items are padded to 32 bits. 
   * 
   *  3c:       STRING          DER certificate with the length as above. 
   * 
   *  43c       INT32           Unknown, seems to always be the value 0x01. 
   *  440       INT32           Flags? Values seen are 0 and 3. 
   *  444       HSTRING         CN? 
   *  45c       HSTRING         CN? 
   *  478       HSTRING         DER CN? 
   *  -         HSTRING         DER CN? 
   *  -         HSTRING         More flags? 
   *  -         HSTRING         DER? 
   *  -         HSTRING         DER? 
   */ 
 
  buf = read_hbuffer(buf); 
 
  int entry_no = buf->read_int32(); 
 
  int unknown = buf->read_int32();  // Other cert no. Often ~3 larger. 
 
  array(int) index = buf->read_ints(12, 4); 
 
  WERR("Certificate index: %O\n", index); 
 
  // This is the DER data for the cert. 
  string(8bit) der = read_string(buf, index[1]); 
 
  int unknown1 = buf->read_int32(); 
  if (unknown1 != 1) { 
    WERR("Certificate #%d has unknown1 != 1: 0x%08x!\n", 
         entry_no, unknown_one); 
  } 
  int version = buf->read_int32();  // X.509 version? 
 
  string(8bit) name = read_string(buf, buf->read_int32()); 
 
  // The alternative name when not identical to name above, 
  // is usually the email adress from the certifivate field 
  // "X509v3 Subject Alternative Name". 
  string(8bit) alternative_name = read_string(buf, buf->read_int32()); 
 
  if (name != alternative_name) { 
    WERR("Cert #%d: Names 1 & 2 differ: %O != %O\n", 
         entry_no, name, alternative_name); 
  } 
 
  // Subject (eg CN="Developer ID Certification Authority"...). 
  string(8bit) subject_der = read_string(buf, buf->read_int32()); 
 
  // Issued by (eg CN="Apple Root CA"...). 
  // Usually the same as Subject (ie self-signed CA). 
  string(8bit) issuer_der = read_string(buf, buf->read_int32()); 
 
  string(8bit) serial_no = read_string(buf, buf->read_int32()); 
 
  // This seems to be the certificate field "X509v3 subjectKeyIdentifier". 
  string(8bit) subject_key_identifier = read_string(buf, buf->read_int32()); 
 
  // Unknown, often the same as subject_key_identifier. 
  // Possibly the subjectKeyIdentifier of the certificate 
  // at position @[unknown] above. 
  string(8bit) der3 = read_string(buf, buf->read_int32()); 
 
  WERR("Cert #%d, Other: #%d, X.509 Version: %d\n" 
       "Name: %O\n" 
       "AltName: %O\n" 
       "Subject: %O\n" 
       "Issuer: %O\n" 
       "Serial no: 0x%s\n" 
       "Subject Key Identifier: 0x%s\n" 
       "Unknown Key Identifier: 0x%s\n" 
       "%s\n", 
       entry_no, unknown, 
       version, 
       name, alternative_name, 
       Standards.ASN1.Decode.secure_der_decode(subject_der), 
       Standards.ASN1.Decode.secure_der_decode(issuer_der), 
       String.string2hex(serial_no), 
       String.string2hex(subject_key_identifier), 
       String.string2hex(der3), 
       Standards.PEM.build("CERTIFICATE", der)); 
 
  Standards.X509.TBSCertificate tbs = 
    Standards.X509->decode_certificate(der); 
  WERR("TBS: %O\n", tbs); 
 
  // NB: We accept all certificates that decode correctly here. 
  //     It is up to the user to actually validate that they 
  //     are proper for use. 
  if (tbs) { 
    WERR("Decoded cert #%d: %O\n", entry_no, name); 
    certs += ({ tbs }); 
  } else { 
    werror("Warning: Failed to decode certificate %O (cert #%d)\n", 
           name, entry_no); 
  } 
 
  if (sizeof(buf)) { 
    WERR("Remaining: %O (%d bytes)\n", buf, sizeof(buf)); 
  } 
} 
 
protected void parse_item(Stdio.Buffer buf) 
{ 
  if (sizeof(buf) < 8) return 0; 
 
  buf = read_hbuffer(buf); 
 
  int type = buf->read_int32(); 
 
  WERR("Item type: %d (0x%08x)\n", type, type); 
 
  array(int) index; 
  int val; 
  switch(type) { 
  case 0x000c:              // Entire file. 
    index = ({}); 
    int offset = 8; 
    do { 
      int i = buf->read_int32(); 
      index += ({ i }); 
      offset += 4; 
    } while (offset < index[0]); 
 
    WERR("Keychain Main Index: \n" 
         "%{  %d,\n%}", 
         index); 
    break; 
  case 0x80001000:  // X509 Certificate table. 
    // Begins with three offsets followed by a NULL. 
    index = ({}); 
    while (val = buf->read_int32()) { 
      index += ({ val }); 
    } 
    WERR("X509 Initial Index: \n" 
         "%{  %d,\n%}", 
         index); 
 
    // Then there's an index table. 
    int num_cert = buf->read_int32(); 
    WERR("Number of certificates: %d\n", num_cert); 
    index = allocate(num_cert); 
    for (int i = 0; i < num_cert; i++) { 
      index[i] = buf->read_int32(); 
    } 
    WERR("X509 Index: \n" 
         "%{  %d,\n%}", 
         index); 
 
    // Then come the certificates. 
    // ... 
    WERR("Certificates:\n"); 
    for (int i = 0; i < num_cert; i++) { 
      parse_cert(buf); 
    } 
 
    while (sizeof(buf)) { 
      Stdio.Buffer sub = read_hbuffer(buf); 
      WERR("Lookup table?: %O\n", sub); 
    } 
    break; 
  default: 
    WERR("Ignored item of type %d (0x%08x) (%d bytes).\n", 
         type, type, sizeof(buf)); 
    return; 
  } 
     
  while (sizeof(buf)) { 
    parse_item(buf); 
  } 
} 
 
void add_keychain(string(8bit) keychain) 
{ 
  if (!has_prefix(keychain, "kych")) return; 
 
  Stdio.Buffer buf = Stdio.Buffer(keychain); 
  buf->read(4); 
 
  /* File format: 
   * 
   * In general: 
   *   32bit big-endian, holerith strings with 32bit length followed 
   *   by data followed by padding to even 32bit. 
   * 
   * Starts with 0x14 bytes of header: 
   * 
   * Offset     Type    Content         Description 
   * 0x00       STRING  "kych"          Magic cookie. 
   * 0x04       INT32   0x10000         Flags? 
   * 0x08       INT32   0x10            Unknown 
   * 0x0c       INT32   0x14            Unknown 
   * 0x10       INT32   0x00            Unknown 
   * 
   * This is followed by a block of data containing the 
   * rest of the file. 
   * 0x14       HSTRING 0x45150         Rest of file. 
   * 0x18       INT32   0x0c            Block type 
   * 0x1c       INT32   0x38            Points to 0x4c if relative to 0x14. 
   * 0x20       INT32   0x364           D:o 0x378 
   * 0x24       INT32   0x1b70          D:o 0x1b84 
   * 0x28       INT32   0x4de8          D:o 0x4dfc 
   * 0x2c       INT32   0x4e10          D:o 0x4e24 
   * 0x30       INT32   0x4f88          D:o 0x4f9c 
   * 0x34       INT32   0x5100          D:o 0x5114 
   * 0x38       INT32   0x5278          D:o 0x528c 
   * 0x3c       INT32   0x52f8          D:o 0x530c 
   * 0x40       INT32   0x5418          D:o 0x542c 
   * 0x44       INT32   0x54d8          D:o 0x54ec      Certs are found here. 
   * 0x48       INT32   0x45068         D:o 0x4507c 
   * 
   * 0x4c       HSTRING 0x32c           Block of data. 
   * 0x50       INT32   0x00            Block type 
   * 
   * 0x378      HSTRING 0x180c          Block of data. 
   * 0x37c      INT32   0x01            Block type 
   * 
   * 0x1b84     HSTRING 0x3278          Block of data 
   * 0x1b88     INT32   0x02            Block type 
   * 
   * 0x4dfc     HSTRING 0x28            Block of data 
   * 0x4e00     INT32   0x06            Block type 
   * 
   * 0x4e24     HSTRING 0x178           Block of data 
   * 0x4e28     INT32   0x0f            Block type 
   * 
   * 0x4f9c     HSTRING 0x178           Block of data 
   * 0x4fa0     INT32   0x10            Block type 
   */ 
 
  string header = buf->read(16); 
 
  WERR("Header: %O\n", header); 
 
  parse_item(buf); 
}