smb_signing.h File Reference

Unix SMB/CIFS implementation. SMB Signing Code. More...

#include "byteorder.h"
#include "md5.h"
#include "smb.h"

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Macros
#define	uchar   unsigned char
#define	uint8   uint8_t

Functions
void	simple_packet_signature_ntlmssp (uint8_t *mac_key, const uchar *buf, uint32 seq_number, unsigned char *calc_md5_mac)

Detailed Description

Unix SMB/CIFS implementation. SMB Signing Code.

Definition in file smb_signing.h.

Macro Definition Documentation

uchar

#define uchar   unsigned char

Definition at line 28 of file smb_signing.h.

uint8

#define uint8   uint8_t

Definition at line 32 of file smb_signing.h.

Function Documentation

simple_packet_signature_ntlmssp()

void simple_packet_signature_ntlmssp	(	uint8_t *	mac_key,
		const uchar *	buf,
		uint32	seq_number,
		unsigned char *	calc_md5_mac
	)

Definition at line 23 of file smb_signing.c.

{
  const size_t offset_end_of_sig = (smb_ss_field + 8);
  unsigned char sequence_buf[8];
  struct MD5Context md5_ctx;
 
  /*
   * Firstly put the sequence number into the first 4 bytes.
   * and zero out the next 4 bytes.
   *
   * We do this here, to avoid modifying the packet.
   */
 
  SIVAL (sequence_buf, 0, seq_number);
  SIVAL (sequence_buf, 4, 0);
 
  /* Calculate the 16 byte MAC - but don't alter the data in the
     incoming packet.
 
     This makes for a bit of fussing about, but it's not too bad.
  */
  MD5Init (&md5_ctx);
 
  /* initialise with the key */
  MD5Update (&md5_ctx, mac_key, 16);
 
  /* copy in the first bit of the SMB header */
  MD5Update (&md5_ctx, buf + 4, smb_ss_field - 4);
 
  /* copy in the sequence number, instead of the signature */
  MD5Update (&md5_ctx, sequence_buf, sizeof (sequence_buf));
 
  /* copy in the rest of the packet in, skipping the signature */
  MD5Update (&md5_ctx, buf + offset_end_of_sig,
             smb_len (buf) - (offset_end_of_sig - 4));
 
  /* calculate the MD5 sig */
  MD5Final (calc_md5_mac, &md5_ctx);
}

References MD5Context::buf, MD5Final(), MD5Init(), MD5Update(), SIVAL, smb_len, and smb_ss_field.

Referenced by nasl_get_sign().

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