The first packet (ClientHello Handshake) can be constructed and is accepted

by SSL servers. Framework.c allows me to test the library against a given
https server.

src/crypto/framework.c

@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include "ssl.h"
+
+int main(int argc, char *argv[])
+{
+  SSL_t ssl;
+  int sockfd, portno, rc;
+  struct sockaddr_in serv_addr;
+  struct hostent *server;
+
+  portno = 443;
+  sockfd = socket(AF_INET,SOCK_STREAM,0);
+  if(sockfd<0){
+    fprintf(stderr,"Error creating socket\n");
+    exit(sockfd);
+  }
+
+  server = gethostbyname(argv[1]);
+  if(server==NULL){
+    fprintf(stderr,"Error looking up host %s\n",argv[1]);
+    exit(1);
+  }
+
+  /**
+   *matrixSslOpen()
+   *matrixSslReadKeys()
+   **/
+  printf("Calling CreateSSLHello()\n");
+  rc = CreateSSLHello(&ssl);
+  printf("Finished calling CreateSSLHello()\n");
+
+  bzero((char *) &serv_addr, sizeof(serv_addr));
+  serv_addr.sin_family = AF_INET;
+  bcopy((char *)server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);
+  serv_addr.sin_port = htons(portno);
+  if(connect(sockfd,(struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0){
+    fprintf(stderr,"ERROR connecting to server\n");
+    exit(1);
+  }
+
+  PrintSSLPacket(&ssl);
+
+  printf("Write ssl.buffer\n");
+  write(sockfd,ssl.buffer,ssl.length);
+  printf("Finished writing\n");
+  ssl.length = read(sockfd,ssl.buffer,ssl.max_size);
+  ReadSSLHello(&ssl);
+
+  /**
+   *matrixSslNewSession()
+   *matrixSslSetCetValidator()
+   *encodeSslHandshake()
+
+   *write handshake buffer
+
+   *readSslResponse() <-+
+                        |
+   *read return code    |-- similar/same function??
+                        |
+   *sslEncode()         |
+   *sslDecode() <-------+
+   
+   *encodeSslCloseAlert()
+   
+   *write close alert buffer
+   **/
+   close(sockfd);
+
+  /**
+   *sslClose()
+   * -free connection
+   * -free keys
+   * -close pki interface
+   **/
+
+  return 0;
+}

src/crypto/ssl.c

@@ -0,0 +1,133 @@
+#include "ssl.h"
+#include "ssl_constructs.h"
+#include <string.h> // for bcopy()
+#include <time.h> // for time()
+#include <stdlib.h> // for rand(), htons?, htonl?
+// note net byte order is big-endian
+// Need to set error codes
+
+int CreateSSLHello(SSL_t *ssl)
+{
+  printf("In CreateSSLHello()\n",ssl);
+
+  // Initalize the structure
+  bzero(ssl,sizeof(SSL_t));
+  //ssl->max_size = sizeof(ssl->buffer);
+  ssl->max_size = 18456;
+
+  // Declare variables
+  int i; void *ptr;
+
+  // Set pointers into buffer
+  SSLPlaintext *record = (SSLPlaintext *)ssl->buffer;
+  Handshake *handshake = (Handshake *)record->fragment;
+  // the body starts right after the handshake
+  printf("sizeof(Handshake) = %d\n",sizeof(Handshake));
+  ClientHello *hello = (ClientHello *)(handshake + 1);
+
+  printf("record->%#x, handshake->%#x, hello->%#x\n",record,handshake,hello);
+
+  // Construct ClientHello Message
+  hello->client_version = version;
+  i = htonl(time(NULL));
+  bcopy(&i,hello->random.gmt_unix_time,4);
+  for(i=0;i<28;i++){ hello->random.random_bytes[i] = (uint8)rand(); }
+  hello->session_id_length = 0;
+  hello->session_id = &hello->session_id_length;
+  hello->session_id_end = hello->session_id;
+  hello->cipher_suites_length = (CipherSuiteLength *)(hello->session_id_end + 1);
+  hello->cipher_suites = (hello->cipher_suites_length + 1);
+  hello->cipher_suites_end = hello->cipher_suites;
+  i = htons(2*5); // 2 bytes per Suite * 5 Suites
+  bcopy(&i,hello->cipher_suites_length,2);
+  bcopy(SSL_NULL_WITH_NULL_NULL,hello->cipher_suites_end,sizeof(CipherSuite));
+  *hello->cipher_suites_end++;
+  bcopy(SSL_DH_DSS_EXPORT_WITH_DES40_CBC_SHA,hello->cipher_suites_end,sizeof(CipherSuite));
+  *hello->cipher_suites_end++;
+  bcopy(SSL_DH_DSS_WITH_DES_CBC_SHA,hello->cipher_suites_end,sizeof(CipherSuite));
+  *hello->cipher_suites_end++;
+  bcopy(SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA,hello->cipher_suites_end,sizeof(CipherSuite));
+  *hello->cipher_suites_end++;
+  bcopy(SSL_DH_anon_WITH_RC4_128_MD5,hello->cipher_suites_end,sizeof(CipherSuite));
+  hello->compression_methods_length = (CompressionMethodLength *)(hello->cipher_suites_end + 1);
+  hello->compression_methods = (hello->compression_methods_length + 1);
+  hello->compression_methods_end = hello->compression_methods;
+  *hello->compression_methods_length = 1;
+  *hello->compression_methods_end = compression_method_null;
+
+  // Construct Handshake Message
+  handshake->msg_type = handshake_type_client_hello;
+  i = (void *)(hello->compression_methods_end + 1) - (void *)hello;
+  printf("Handshake.length = %d\n", i);
+  handshake->length[0] = (char)*(&i+8);
+  handshake->length[1] = (char)*(&i+8);
+  handshake->length[2] = (char)i;
+  //bcopy((&i+1),handshake->length,3); // +1 so we copy 3 bytes
+
+  // Construct SSL Record
+  printf("sizeof(ContentType)=%d\n",sizeof(ContentType));
+  printf("sizeof(uint8)=%d\n",sizeof(uint8));
+  record->type = content_type_handshake;
+  record->version = version;
+  i += sizeof(Handshake);
+  printf("SSLPlaintext.length = %d\n",i);
+  record->length[0] = (char)*(&i+8);
+  record->length[1] = (char)i;
+  //bcopy(&i,record->length,4); // length of handshake
+
+  // Set total size of message
+  i += sizeof(ContentType) + sizeof(ProtocolVersion) + sizeof(uint16);
+  ssl->length = i;
+  printf("End of CreateSSLHello\n");
+  return 0;
+}
+
+void PrintSSLPacket(SSL_t *ssl)
+{
+  printf("Printing packet with length:%d\n", ssl->length);
+  char *ptr = ssl->buffer;
+  char *begin = ptr;
+  char *tmp;
+  char *end = ssl->buffer + ssl->length;
+  printf("Record Layer:\n");
+  printf("\tContentType: %2hhX\n",(char)*ptr++);
+  printf("\tVersion: %2hhX %2hhX\n", (char)*ptr++, (char)*ptr++);
+  printf("\tLength: %2hhX %2hhX\n", (char)*ptr++, (char)*ptr++);
+
+  printf("Handshake:\n");
+  printf("\tType: %2hhX\n", (char)*ptr++);
+  printf("\tLength: %2hhX %2hhX %2hhX\n", (char)*ptr++, (char)*ptr++, (char)*ptr++);
+  printf("\tVersion: %2hhX %2hhX\n", (char)*ptr++, (char)*ptr++);
+  printf("\tgmt_unix_time: %2hhX %2hhX %2hhX %2hhX\n", (char)*ptr++, (char)*ptr++, (char)*ptr++, (char)*ptr++);
+  printf("\trandom: ");
+  tmp = ptr + 28;
+  for(;ptr<tmp;ptr++){printf("%2hhX ", (char)*ptr);}
+
+  printf("\n\nHexDump:\n");
+
+  int ctr = 0;
+  for(;begin<end;begin++){printf("%2hhX ",(char)*begin);if(++ctr%10==0){printf("\n");}}
+  printf("\n\n");
+}
+
+int ReadSSLHello(SSL_t *ssl)
+{
+  SSLCiphertext *ct = (SSLCiphertext *)ssl->buffer;
+
+  if(ct->type == content_type_alert){
+    // assuming text is still plaintext
+    Alert *a = (Alert *)&ct->fragment;
+    if(a->level == alert_level_fatal){
+      printf("Fatal Alert %d, connection terminated\n",a->description);
+      return (1);
+    }else if(a->level == alert_level_warning){
+      printf("Warning Alert %d\n", a->description);
+    }else{
+      printf("Unknown alert level %d\n", a->level);
+    }
+  }else{
+    printf("SSL type %d\n",ct->type);
+  }
+  return (0);
+}
+

src/crypto/ssl.h

@@ -0,0 +1,19 @@
+// At the moment I have hard coded one buffer. The size
+//  is the max size of SSLCiphertext.length (so, actually it should
+//  be increased to include the other information in the struct)
+// I might need to make a new, or split the current, buffer because
+//  I have to have space to read in and write out, as well as keep
+//  any data that has not been translated.
+// It works for now.
+typedef struct _ssl_t{
+  char buffer[18456];
+  int length;
+  int max_size; // can't define const here
+  // Current CipherSuite 
+  // Client random / Server random ???
+  // pointers to different crypto functions
+} SSL_t;
+
+int CreateSSLHello(SSL_t *ssl);
+int ReadSSLHello(SSL_t *ssl);
+void PrintSSLPacket(SSL_t *ssl);

src/crypto/ssl_constructs.h

@@ -1,4 +1,6 @@
 // Note: This file still needs some work.
+// Note: I had to redefine the enums to a set of const values,
+//   so that the size of the variable would be correct.
 
 // Typedefs
 // (As defined by the SSL v3.0 RFC Draft)
@@ -14,15 +16,13 @@ typedef struct _ProtocolVersion{
   uint8 major, minor;
 } ProtocolVersion;
 
-ProtocolVersion version = { 3, 0 };
+const ProtocolVersion version = { 3, 0 };
 
-typedef enum _ContentType{
-  content_type_change_cipher_spec_type=20,
-  content_type_alert=21,
-  content_type_handshake=22,
-  content_type_application_data=23,
-  content_type_size=255 // to force size
-} ContentType;
+typedef uint8 ContentType;
+const ContentType content_type_change_cipher_spec_type = 20;
+const ContentType content_type_alert = 21;
+const ContentType content_type_handshake = 22;
+const ContentType content_type_application_data = 23;
 
 typedef struct _SSLPlaintext{
   ContentType type;
@@ -38,6 +38,14 @@ typedef struct _SSLCompressed{
   uint8 fragment[17408]; // SSLCompressed.length
 } SSLCompressed;
 
+typedef struct _SSLCiphertext{
+  ContentType type;
+  ProtocolVersion version;
+  uint16 length;
+  uint8 fragment; // so we have a pointer to the data, and don't have to do math
+  // fragment; type GenericStreamCipher or GenericBlockCipher
+} SSLCiphertext; // recast to get fragment
+
 typedef struct _GenericStreamCipher{
   uint8 content[17408]; // SSLCompressed.length
   uint8 MAC[]; // CipherSpec.hash_size
@@ -72,27 +80,23 @@ typedef struct _ChangeCipherSpec{
 } ChangeCipherSpec;
 
 // Alert messages
-typedef enum _AlertLevel{
-  alert_level_warning=1,
-  alert_level_fatal=2,
-  alert_level_size=255 
-} AlertLevel;
-
-typedef enum _AlertDescription{
-  alert_description_close_notify=0,
-  alert_description_unexpected_message=10,
-  alert_description_bad_record_mac=20,
-  alert_description_decompression_failure=30,
-  alert_description_handshake_failure=40,
-  alert_description_no_certificate=41,
-  alert_description_bad_certificate=42,
-  alert_description_unsupported_certificate=43,
-  alert_description_certificate_revoked=44,
-  alert_description_certificate_expired=45,
-  alert_description_certificate_unknown=46,
-  alert_description_illegal_parameter=47,
-  alert_description_size=255
-} AlertDescription;
+typedef uint8 AlertLevel;
+const AlertLevel alert_level_warning = 1;
+const AlertLevel alert_level_fatal=2;
+
+typedef uint8 AlertDescription;
+const AlertDescription alert_description_close_notify = 0;
+const AlertDescription alert_description_unexpected_message = 10;
+const AlertDescription alert_description_bad_record_mac = 20;
+const AlertDescription alert_description_decompression_failure = 30;
+const AlertDescription alert_description_handshake_failure = 40;
+const AlertDescription alert_description_no_certificate = 41;
+const AlertDescription alert_description_bad_certificate = 42;
+const AlertDescription alert_description_unsupported_certificate = 43;
+const AlertDescription alert_description_certificate_revoked = 44;
+const AlertDescription alert_description_certificate_expired = 45;
+const AlertDescription alert_description_certificate_unknown = 46;
+const AlertDescription alert_description_illegal_parameter = 47;
 
 typedef struct _Alert{
   AlertLevel level;
@@ -101,23 +105,22 @@ typedef struct _Alert{
 
 // Handshake protocol
 // What is the best way to have a generic pointer to the body struct??
-typedef enum _HandshakeType{
-  handshake_type_hello_request=0,
-  handshake_type_client_hello=1,
-  handshake_type_server_hello=2,
-  handshake_type_certificate=11,
-  handshake_type_server_key_exchange=12,
-  handshake_type_certificate_request=13,
-  handshake_type_server_done=14,
-  handshake_type_certificate_verify=15,
-  handshake_type_client_key_exchange=16,
-  handshake_type_finished=20,
-  handshake_type_size=255
-} HandshakeType;
+typedef uint8 HandshakeType;
+const HandshakeType handshake_type_hello_request = 0;
+const HandshakeType handshake_type_client_hello = 1;
+const HandshakeType handshake_type_server_hello = 2;
+const HandshakeType handshake_type_certificate = 11;
+const HandshakeType handshake_type_server_key_exchange = 12;
+const HandshakeType handshake_type_certificate_request = 13;
+const HandshakeType handshake_type_server_done = 14;
+const HandshakeType handshake_type_certificate_verify = 15;
+const HandshakeType handshake_type_client_key_exchange = 16;
+const HandshakeType handshake_type_finished = 20;
 
 typedef struct _Handshake{
   HandshakeType msg_type;
   uint24 length;
+  // body; // one of HandshakeType structs
 } Handshake; // generic Handshake, need to recast to get body
 
 // Hello messages
@@ -134,21 +137,38 @@ typedef struct _Random{
   uint8 random_bytes[28];
 } Random;
 
-typedef uint8 SessionID[32]; // <0..32>
+//typedef uint8 SessionID[32]; // <0..32>
+typedef uint8 SessionIDLength;
+typedef uint8 SessionID;
+
+typedef uint16 CipherSuiteLength;
 typedef uint8 CipherSuite[2];
 
-typedef enum _CompressionMethod{ compression_method_null=0, compression_method_size=255 } CompressionMethod;
+typedef uint8 CompressionMethodLength;
+typedef uint8 CompressionMethod;
+const CompressionMethod compression_method_null = 0;
+
 
 typedef struct _ClientHello{
   ProtocolVersion client_version;
   Random random;
-  SessionID session_id;
-  CipherSuite cipher_suites[32768]; // <2..2^16-1> = 65,536 bytes and CipherSuite is 2 bytes
-  CompressionMethod compression_methods[256]; // <0..2^8-1> = 256 bytes and CompressionMethod is 1 byte
+  SessionIDLength session_id_length;
+  SessionID *session_id;
+  SessionID *session_id_end;
+  CipherSuiteLength *cipher_suites_length;
+  CipherSuite *cipher_suites; // min size is one entry
+  CipherSuite *cipher_suites_end;
+  //CipherSuite cipher_suites[32768]; // <2..2^16-1> = 65,536 bytes and CipherSuite is 2 bytes
+  CompressionMethodLength *compression_methods_length;
+  CompressionMethod *compression_methods;
+  CompressionMethod *compression_methods_end;
+  //CompressionMethod *compression_methods; // min size is zero
+  //CompressionMethod compression_methods[256]; // <0..2^8-1> = 256 bytes and CompressionMethod is 1 byte
 } ClientHello;
 
 typedef struct _ClientHelloHandshake{
-  HandshakeType msg_type;
+  //HandshakeType msg_type;
+  uint8 msg_type;
   uint24 length;
   ClientHello body;
 } ClientHelloHandshake;
@@ -175,11 +195,10 @@ typedef struct _Certificate{
   // for some reason the size of certificate_list and ASN1Cert is the same, so only one certificate in the list
 } Certificate;
 
-typedef enum _KeyExchangeAlgorithm{
-  key_exchange_algorithm_rsa,
-  key_exchange_algorithm_diffie_hellman,
-  key_exchange_algorithm_fortezza_kea 
-} KeyExchangeAlgorithm;
+typedef uint8 KeyExchangeAlgorithm;
+const KeyExchangeAlgorithm key_exchange_algorithm_rsa = 0;
+const KeyExchangeAlgorithm key_exchange_algorithm_diffie_hellman = 1;
+const KeyExchangeAlgorithm key_exchange_algorithm_fortezza_kea = 2;
 
 typedef struct _AnonSignature{
   struct {};
@@ -218,22 +237,19 @@ typedef struct _ServerRSAKeyExchange{
   Signature signed_params;
 } ServerRSAKeyExchange;
 
-typedef enum _SignatureAlgorithm{
-  signature_algorithm_anonymous,
-  signature_algorithm_rsa,
-  signature_algorithm_dsa 
-} SignatureAlgorithm;
-
-typedef enum _CertificateType{
-  certificate_type_RSA_sign=1,
-  certificate_type_DSS_sign=2,
-  certificate_type_RSA_fixed_DH=3,
-  certificate_type_DSS_fixed_DH=4,
-  certificate_type_RSA_ephemeral_DH=5,
-  certificate_type_DSS_ephemeral_DH=6,
-  certificate_type_FORTEZZA_MISSI=20,
-  certificate_type_size=255
-} CertificateType;
+typedef uint8 SignatureAlgorithm;
+const SignatureAlgorithm signature_algorithm_anonymous = 0;
+const SignatureAlgorithm signature_algorithm_rsa = 1;
+const SignatureAlgorithm signature_algorithm_dsa = 2;
+
+typedef uint8 CertificateType;
+const CertificateType certificate_type_RSA_sign = 1;
+const CertificateType certificate_type_DSS_sign = 2;
+const CertificateType certificate_type_RSA_fixed_DH = 3;
+const CertificateType certificate_type_DSS_fixed_DH = 4;
+const CertificateType certificate_type_RSA_ephemeral_DH = 5;
+const CertificateType certificate_type_DSS_ephemeral_DH = 6;
+const CertificateType certificate_type_FORTEZZA_MISSI = 20;
 
 typedef uint8 DistinguishedName[65536]; // <1..2^16-1> = 65,536
 
@@ -259,7 +275,9 @@ typedef struct _RSAClientKeyExchange{
   EncryptedPreMasterSecret exchange_keys;
 } RSAClientKeyExchange;
 
-typedef enum _PublicValueEncoding{ public_value_encoding_implicit, public_value_encoding_explicit } PublicValueEncoding;
+typedef uint8 PublicValueEncoding;
+const PublicValueEncoding public_value_encoding_implicit = 0;
+const PublicValueEncoding public_value_encoding_explicit = 1;
 
 typedef struct _ClientDiffieHellmanPublic{
   // This is a select on PublicValueEncoding,  and I chose the larger size
@@ -281,25 +299,35 @@ typedef struct _Finished{
 } Finished;
 
 // The CipherSuite
-CipherSuite SSL_NULL_WITH_NULL_NULL                     = { 0x00, 0x00 };
+CipherSuite SSL_NULL_WITH_NULL_NULL                     = { 0x00, 0x13 };
 CipherSuite SSL_DH_DSS_EXPORT_WITH_DES40_CBC_SHA        = { 0x00, 0x0B };
 CipherSuite SSL_DH_DSS_WITH_DES_CBC_SHA                 = { 0x00, 0x0C };
+CipherSuite SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA       = { 0x00, 0x11 };
 CipherSuite SSL_DH_anon_EXPORT_WITH_RC4_40_MD5          = { 0x00, 0x17 };
 CipherSuite SSL_DH_anon_WITH_RC4_128_MD5                = { 0x00, 0x18 };
 
 // The CipherSpec
-typedef enum _CipherType{ cipher_type_stream, cipher_type_block } CipherType;
-typedef enum _IsExportable{ is_exportable_true, is_exportable_false } IsExportable;
-typedef enum _BulkCipherAlgorithm{
-  bulk_cipher_algorithm_null,
-  bulk_cipher_algorithm_rc4,
-  bulk_cipher_algorithm_rc2,
-  bulk_cipher_algorithm_des,
-  bulk_cipher_algorithm_3des,
-  bulk_cipher_algorithm_des40,
-  bulk_cipher_algorithm_fortezza 
-} BulkCipherAlgorithm;
-typedef enum _MACAlgorithm{ mac_algorithm_null, mac_algorithm_md5, mac_algorithm_sha } MACAlgorithm;
+typedef uint8 CipherType;
+const CipherType cipher_type_stream = 0;
+const CipherType cipher_type_block = 1;
+
+typedef uint8 IsExportable;
+const IsExportable is_exportable_true = 0;
+const IsExportable is_exportable_false = 1;
+
+typedef uint8 BulkCipherAlgorithm;
+const BulkCipherAlgorithm bulk_cipher_algorithm_null = 0;
+const BulkCipherAlgorithm bulk_cipher_algorithm_rc4 = 1;
+const BulkCipherAlgorithm bulk_cipher_algorithm_rc2 = 2;
+const BulkCipherAlgorithm bulk_cipher_algorithm_des = 3;
+const BulkCipherAlgorithm bulk_cipher_algorithm_3des = 4;
+const BulkCipherAlgorithm bulk_cipher_algorithm_des40 = 5;
+const BulkCipherAlgorithm bulk_cipher_algorithm_fortezza = 6;
+
+typedef uint8 MACAlgorithm;
+const MACAlgorithm mac_algorithm_null = 0;
+const MACAlgorithm mac_algorithm_md5 = 1;
+const MACAlgorithm mac_algorithm_sha = 2;
 
 typedef struct _CipherSpec{
   BulkCipherAlgorithm bulk_cipher_algorithm;