s3-schannel: remove unused schannel_decode/schannel_encode.

Guenther

1 files changed, 0 insertions, 286 deletions

diff --git a/source3/rpc_parse/parse_prs.c b/source3/rpc_parse/parse_prs.c
index 09263b45d4..edccded6c6 100644
--- a/source3/rpc_parse/parse_prs.c
+++ b/source3/rpc_parse/parse_prs.c
@@ -1066,292 +1066,6 @@ bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_
 }
 
 /*******************************************************************
- Create a digest over the entire packet (including the data), and 
- MD5 it with the session key.
- ********************************************************************/
-
-static void schannel_digest(struct schannel_auth_struct *a,
-			  enum dcerpc_AuthLevel auth_level,
-			  struct NL_AUTH_SIGNATURE *verf,
-			  char *data, size_t data_len,
-			  uchar digest_final[16]) 
-{
-	uchar whole_packet_digest[16];
-	uchar zeros[4];
-	struct MD5Context ctx3;
-	uint8_t sig[8];
-
-	ZERO_STRUCT(zeros);
-	ZERO_STRUCT(sig);
-
-	SSVAL(sig,0,verf->SignatureAlgorithm);
-	SSVAL(sig,2,verf->SealAlgorithm);
-	SSVAL(sig,4,verf->Pad);
-	SSVAL(sig,6,verf->Flags);
-
-	/* verfiy the signature on the packet by MD5 over various bits */
-	MD5Init(&ctx3);
-	/* use our sequence number, which ensures the packet is not
-	   out of order */
-	MD5Update(&ctx3, zeros, sizeof(zeros));
-	MD5Update(&ctx3, sig, 8);
-	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
-		MD5Update(&ctx3, verf->Confounder, sizeof(verf->Confounder));
-	}
-	MD5Update(&ctx3, (const unsigned char *)data, data_len);
-	MD5Final(whole_packet_digest, &ctx3);
-	dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
-	
-	/* MD5 this result and the session key, to prove that
-	   only a valid client could had produced this */
-	hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
-}
-
-/*******************************************************************
- Calculate the key with which to encode the data payload 
- ********************************************************************/
-
-static void schannel_get_sealing_key(struct schannel_auth_struct *a,
-				   struct NL_AUTH_SIGNATURE *verf,
-				   uchar sealing_key[16]) 
-{
-	uchar zeros[4];
-	uchar digest2[16];
-	uchar sess_kf0[16];
-	int i;
-
-	ZERO_STRUCT(zeros);
-
-	for (i = 0; i < sizeof(sess_kf0); i++) {
-		sess_kf0[i] = a->sess_key[i] ^ 0xf0;
-	}
-	
-	dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
-	
-	/* MD5 of sess_kf0 and 4 zero bytes */
-	hmac_md5(sess_kf0, zeros, 0x4, digest2);
-	dump_data_pw("digest2:\n", digest2, sizeof(digest2));
-	
-	/* MD5 of the above result, plus 8 bytes of sequence number */
-	hmac_md5(digest2, verf->SequenceNumber, sizeof(verf->SequenceNumber), sealing_key);
-	dump_data_pw("sealing_key:\n", sealing_key, 16);
-}
-
-/*******************************************************************
- Encode or Decode the sequence number (which is symmetric)
- ********************************************************************/
-
-static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
-				       struct NL_AUTH_SIGNATURE *verf)
-{
-	uchar zeros[4];
-	uchar sequence_key[16];
-	uchar digest1[16];
-
-	ZERO_STRUCT(zeros);
-
-	hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
-	dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
-
-	hmac_md5(digest1, verf->Checksum, 8, sequence_key);
-
-	dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
-
-	dump_data_pw("seq_num (before):\n", verf->SequenceNumber, sizeof(verf->SequenceNumber));
-	arcfour_crypt(verf->SequenceNumber, sequence_key, 8);
-	dump_data_pw("seq_num (after):\n", verf->SequenceNumber, sizeof(verf->SequenceNumber));
-}
-
-/*******************************************************************
- Encode a blob of data using the schannel alogrithm, also produceing
- a checksum over the original data.  We currently only support
- signing and sealing togeather - the signing-only code is close, but not
- quite compatible with what MS does.
- ********************************************************************/
-
-void schannel_encode(struct schannel_auth_struct *a, enum dcerpc_AuthLevel auth_level,
-		   enum schannel_direction direction,
-		   struct NL_AUTH_SIGNATURE *verf,
-		   char *data, size_t data_len)
-{
-	uchar digest_final[16];
-	uchar confounder[8];
-	uchar seq_num[8];
-	static const uchar nullbytes[8] = { 0, };
-
-	DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
-	
-	/* fill the 'confounder' with random data */
-	generate_random_buffer(confounder, sizeof(confounder));
-
-	dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
-
-	RSIVAL(seq_num, 0, a->seq_num);
-
-	switch (direction) {
-	case SENDER_IS_INITIATOR:
-		SIVAL(seq_num, 4, 0x80);
-		break;
-	case SENDER_IS_ACCEPTOR:
-		SIVAL(seq_num, 4, 0x0);
-		break;
-	}
-
-	dump_data_pw("verf->SequenceNumber:\n", verf->SequenceNumber, sizeof(verf->SequenceNumber));
-
-	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
-		verf->SealAlgorithm		= NL_SEAL_RC4;
-	} else {
-		verf->SealAlgorithm		= NL_SEAL_NONE;
-	}
-
-	verf->SignatureAlgorithm	= NL_SIGN_HMAC_MD5;
-	verf->Pad			= 0xffff;
-	verf->Flags			= 0x0000;
-
-	memcpy(verf->SequenceNumber, seq_num, sizeof(verf->SequenceNumber));
-	memcpy(verf->Checksum, nullbytes, sizeof(verf->Checksum));
-	memcpy(verf->Confounder, confounder, sizeof(verf->Confounder));
-
-	/* produce a digest of the packet to prove it's legit (before we seal it) */
-	schannel_digest(a, auth_level, verf, data, data_len, digest_final);
-	memcpy(verf->Checksum, digest_final, sizeof(verf->Checksum));
-
-	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
-		uchar sealing_key[16];
-
-		/* get the key to encode the data with */
-		schannel_get_sealing_key(a, verf, sealing_key);
-
-		/* encode the verification data */
-		dump_data_pw("verf->Confounder:\n", verf->Confounder, sizeof(verf->Confounder));
-		arcfour_crypt(verf->Confounder, sealing_key, 8);
-
-		dump_data_pw("verf->Confounder_enc:\n", verf->Confounder, sizeof(verf->Confounder));
-		
-		/* encode the packet payload */
-		dump_data_pw("data:\n", (const unsigned char *)data, data_len);
-		arcfour_crypt((unsigned char *)data, sealing_key, data_len);
-		dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
-	}
-
-	/* encode the sequence number (key based on packet digest) */
-	/* needs to be done after the sealing, as the original version 
-	   is used in the sealing stuff... */
-	schannel_deal_with_seq_num(a, verf);
-
-	return;
-}
-
-/*******************************************************************
- Decode a blob of data using the schannel alogrithm, also verifiying
- a checksum over the original data.  We currently can verify signed messages,
- as well as decode sealed messages
- ********************************************************************/
-
-bool schannel_decode(struct schannel_auth_struct *a, enum dcerpc_AuthLevel auth_level,
-		   enum schannel_direction direction, 
-		   struct NL_AUTH_SIGNATURE *verf, char *data, size_t data_len)
-{
-	uchar digest_final[16];
-
-	static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
-	static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
-	const uchar *schannel_sig = NULL;
-
-	uchar seq_num[8];
-
-	DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
-	
-	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
-		schannel_sig = schannel_seal_sig;
-	} else {
-		schannel_sig = schannel_sign_sig;
-	}
-
-	/* Create the expected sequence number for comparison */
-	RSIVAL(seq_num, 0, a->seq_num);
-
-	switch (direction) {
-	case SENDER_IS_INITIATOR:
-		SIVAL(seq_num, 4, 0x80);
-		break;
-	case SENDER_IS_ACCEPTOR:
-		SIVAL(seq_num, 4, 0x0);
-		break;
-	}
-
-	DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
-	dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
-
-	dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
-
-	/* extract the sequence number (key based on supplied packet digest) */
-	/* needs to be done before the sealing, as the original version 
-	   is used in the sealing stuff... */
-	schannel_deal_with_seq_num(a, verf);
-
-	if (memcmp(verf->SequenceNumber, seq_num, sizeof(seq_num))) {
-		/* don't even bother with the below if the sequence number is out */
-		/* The sequence number is MD5'ed with a key based on the whole-packet
-		   digest, as supplied by the client.  We check that it's a valid 
-		   checksum after the decode, below
-		*/
-		DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
-		dump_data(2, verf->SequenceNumber, sizeof(verf->SequenceNumber));
-		DEBUG(2, ("should be:\n"));
-		dump_data(2, seq_num, sizeof(seq_num));
-
-		return False;
-	}
-
-	if (memcmp(&verf->SignatureAlgorithm, &schannel_sig[0], 2) ||
-	    memcmp(&verf->SealAlgorithm, &schannel_sig[2], 2) ||
-	    memcmp(&verf->Pad, &schannel_sig[4], 2) ||
-	    memcmp(&verf->Flags, &schannel_sig[6], 2)) {
-		/* Validate that the other end sent the expected header */
-		DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
-		dump_data(2, (const uint8_t *)verf, sizeof(schannel_sig));
-		DEBUG(2, ("should be:\n"));
-		dump_data(2, schannel_sig, sizeof(schannel_sig));
-		return False;
-	}
-
-	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
-		uchar sealing_key[16];
-		
-		/* get the key to extract the data with */
-		schannel_get_sealing_key(a, verf, sealing_key);
-
-		/* extract the verification data */
-		dump_data_pw("verf->Confounder:\n", verf->Confounder,
-			     sizeof(verf->Confounder));
-		arcfour_crypt(verf->Confounder, sealing_key, 8);
-
-		dump_data_pw("verf->Confounder_dec:\n", verf->Confounder,
-			     sizeof(verf->Confounder));
-		
-		/* extract the packet payload */
-		dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
-		arcfour_crypt((unsigned char *)data, sealing_key, data_len);
-		dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);	
-	}
-
-	/* digest includes 'data' after unsealing */
-	schannel_digest(a, auth_level, verf, data, data_len, digest_final);
-
-	dump_data_pw("Calculated digest:\n", digest_final, 
-		     sizeof(digest_final));
-	dump_data_pw("verf->Checksum:\n", verf->Checksum,
-		     sizeof(verf->Checksum));
-	
-	/* compare - if the client got the same result as us, then
-	   it must know the session key */
-	return (memcmp(digest_final, verf->Checksum,
-		       sizeof(verf->Checksum)) == 0);
-}
-
-/*******************************************************************
 creates a new prs_struct containing a DATA_BLOB
 ********************************************************************/
 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)