File: chntpw.c

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chntpw 0.99.6-2
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/*
 * chntpw.c - Offline Password Edit Utility for NT 3.51 4.0 5.0 5.1 6.0 SAM database.
 *
 * This program uses the "ntreg" library to load and access the registry, it's purpose
 * is to reset password based information.
 * There is also a simple commandline based registry editor included.
 * 
 * 2008-mar: Minor other tweaks
 * 2008-mar: Interactive reg ed moved out of this file, into edlib.c
 * 2008-mar: 64 bit compatible patch by Mike Doty, via Alon Bar-Lev
 *           http://bugs.gentoo.org/show_bug.cgi?id=185411
 * 2007-sep: Group handling extended, promotion now public
 * 2007-sep: User edit menu, some changes to user info edit
 * 2007-apr-may: Get and display users group memberships
 * 2007-apr: GNU license. Some bugfixes. Cleaned up some output.
 * 2004-aug: More stuff in regedit. Stringinput bugfixes.
 * 2004-jan: Changed some of the verbose/debug stuff
 * 2003-jan: Changed to use more of struct based V + some small stuff
 * 2003-jan: Support in ntreg for adding keys etc. Editor updated.
 * 2002-dec: New option: Specify user using RID
 * 2002-dec: New option: blank the pass (zero hash lengths).
 * 2001-jul: extra blank password logic (when NT or LANMAN hash missing)
 * 2001-jan: patched & changed to use OpenSSL. Thanks to Denis Ducamp
 * 2000-jun: changing passwords regardless of syskey.
 * 2000-jun: syskey disable works on NT4. Not properly on NT5.
 * 2000-jan: Attempt to detect and disable syskey
 * 1999-feb: Now able to browse registry hives. (write support to come)
 * See HISTORY.txt for more detailed info on history.
 *
 *****
 *
 * Copyright (c) 1997-2008 Petter Nordahl-Hagen.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * See file GPL.txt for the full license.
 * 
 *****
 *
 * Information and ideas taken from pwdump by Jeremy Allison.
 *
 * More info from NTCrack by Jonathan Wilkins.
 * 
 */ 

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <inttypes.h>

#include <openssl/des.h>
#include <openssl/md4.h>
#define uchar u_char
#define MD4Init MD4_Init
#define MD4Update MD4_Update
#define MD4Final MD4_Final

#include "ntreg.h"
#include "sam.h"

const char chntpw_version[] = "chntpw version 0.99.6 080526 (sixtyfour), (c) Petter N Hagen";

extern char *val_types[REG_MAX+1];

/* Global verbosity */
int gverbose = 0;


#define MAX_HIVES 10

/* Array of loaded hives */
struct hive *hive[MAX_HIVES+1];
int no_hives = 0;

/* Icky icky... globals used to refer to hives, will be
 * set when loading, so that hives can be loaded in any order
 */

int H_SAM = -1;
int H_SYS = -1;
int H_SEC = -1;
int H_SOF = -1;

int syskeyreset = 0;
int dirty = 0;
int max_sam_lock = 0;

/*
 * of user with RID 500, because silly MS decided
 * to localize the bloody admin-username!! AAAGHH!
 */
char admuser[129]="Administrator";

/* ============================================================== */

/* Crypto-stuff & support for what we'll do in the V-value */

/* Zero out string for lanman passwd, then uppercase
 * the supplied password and put it in here */

void make_lanmpw(char *p, char *lm, int len)
{
   int i;
   
   for (i=0; i < 15; i++) lm[i] = 0;
   for (i=0; i < len; i++) lm[i] = toupper(p[i]);
}

/*
 * Convert a 7 byte array into an 8 byte des key with odd parity.
 */

void str_to_key(unsigned char *str,unsigned char *key)
{
	int i;

	key[0] = str[0]>>1;
	key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
	key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
	key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
	key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
	key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
	key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
	key[7] = str[6]&0x7F;
	for (i=0;i<8;i++) {
		key[i] = (key[i]<<1);
	}
	DES_set_odd_parity((des_cblock *)key);
}

/*
 * Function to convert the RID to the first decrypt key.
 */

void sid_to_key1(uint32_t sid,unsigned char deskey[8])
{
	unsigned char s[7];

	s[0] = (unsigned char)(sid & 0xFF);
	s[1] = (unsigned char)((sid>>8) & 0xFF);
	s[2] = (unsigned char)((sid>>16) & 0xFF);
	s[3] = (unsigned char)((sid>>24) & 0xFF);
	s[4] = s[0];
	s[5] = s[1];
	s[6] = s[2];

	str_to_key(s,deskey);
}

/*
 * Function to convert the RID to the second decrypt key.
 */

void sid_to_key2(uint32_t sid,unsigned char deskey[8])
{
	unsigned char s[7];
	
	s[0] = (unsigned char)((sid>>24) & 0xFF);
	s[1] = (unsigned char)(sid & 0xFF);
	s[2] = (unsigned char)((sid>>8) & 0xFF);
	s[3] = (unsigned char)((sid>>16) & 0xFF);
	s[4] = s[0];
	s[5] = s[1];
	s[6] = s[2];

	str_to_key(s,deskey);
}

/* DES encrypt, for LANMAN */

void E1(uchar *k, uchar *d, uchar *out)
{
  des_key_schedule ks;
  des_cblock deskey;

  str_to_key(k,(uchar *)deskey);
#ifdef __FreeBSD__
  des_set_key(&deskey,ks);
#else /* __FreeBsd__ */
  des_set_key((des_cblock *)deskey,ks);
#endif /* __FreeBsd__ */
  des_ecb_encrypt((des_cblock *)d,(des_cblock *)out, ks, DES_ENCRYPT);
}


/* Check if hive is SAM, and if it is, extract some
 * global policy information from it, like lockout counts etc
 */

void check_get_samdata(void)
{
  struct accountdb_F *f;
  struct keyval *v;

  if (H_SAM >= 0) {

    /* Get users F value */
    v = get_val2buf(hive[H_SAM], NULL, 0, ACCOUNTDB_F_PATH, REG_BINARY, TPF_VK);
    if (!v) {
      printf("Login counts data not found in SAM\n");
      return;
    }
    printf("\n* SAM policy limits:\n");
    
    f = (struct accountdb_F *)&v->data;
    max_sam_lock = f->locklimit;
    
    printf("Failed logins before lockout is: %d\n",max_sam_lock);
    printf("Minimum password length        : %d\n",f->minpwlen);
    printf("Password history count         : %d\n",f->minpwlen);
    
  }
}


/* Try to decode and possibly change account lockout etc
 * This is \SAM\Domains\Account\Users\<RID>\F
 * It's size seems to always be 0x50.
 * Params: RID - user ID, mode - 0 silent, 1 silent, 2 edit.
 * Returns: ACB bits with high bit set if lockout count is >0
 */

short handle_F(int rid, int mode)
{

  struct user_F *f;
  char s[200];
  struct keyval *v;
  unsigned short acb;
  int b;

  if (H_SAM < 0) return(0);

  /* Get users F value */
  snprintf(s,180,"\\SAM\\Domains\\Account\\Users\\%08X\\F",rid);
  v = get_val2buf(hive[H_SAM], NULL, 0, s, REG_BINARY, TPF_VK_EXACT);
  if (!v) {
    printf("Cannot find value <%s>\n",s);
    return(0);
  }

  if (v->len < 0x48) {
    printf("handle_F: F value is 0x%x bytes, need >= 0x48, unable to check account flags!\n",v->len);
    FREE(v);
    return(0);
  }

  f = (struct user_F *)&v->data;
  acb = f->ACB_bits;

  if (mode == 1) {
    printf("Account bits: 0x%04x =\n",acb);


    for (b=0; b < 15; b++) {
      printf("[%s] %-15.15s | ",
	     (acb & (1<<b)) ? "X" : " ", acb_fields[b] );
      if (b%3 == 2) printf("\n");
    }

    printf("\nFailed login count: %u, while max tries is: %u\n",f->failedcnt,max_sam_lock);
    printf("Total  login count: %u\n",f->logins);
  }
    
  if (mode == 2) {
    acb |= ACB_PWNOEXP;
    acb &= ~ACB_DISABLED;
    acb &= ~ACB_AUTOLOCK;
    f->ACB_bits = acb;
    f->failedcnt = 0;
    put_buf2val(hive[H_SAM], v, 0, s, REG_BINARY,TPF_VK_EXACT);
    printf("Unlocked!\n");
  }
  return (acb | ( (f->failedcnt > 0 && f->failedcnt >= max_sam_lock)<<15 ) | (acb & ACB_AUTOLOCK)<<15 | (acb & ACB_DISABLED)<<15);
}


/* List users membership or check if admin (is in admin group)
 * rid   - users rid
 * check - if 1 just check if admin, do not list
 * returns true if user is admin
 */

int list_user_groups(int rid, int check)
{
  char s[200];
  char g[200];
  char groupname[128];
  int nk = 0;
  struct keyval *m = NULL, *c = NULL;
  struct group_C *cd;
  unsigned int *grps;
  int count = 0, isadmin = 0;
  int i, size, grp, grpnamoffs, grpnamlen;

  if (!rid || (H_SAM < 0)) return(0);
  
  
  /* Get member list for user. Go for the first full SID, it's usually local computer I hope */
  snprintf(s,180,"\\SAM\\Domains\\Builtin\\Aliases\\Members\\S-1-5-21-\\%08X",rid);
  /* Now, the TYPE field is the number of groups the user is member of */
  /* Don't we just love the inconsistent use of fields!! */
  nk = trav_path(hive[H_SAM], 0, s, 0);
  if (!nk) {
    /* This probably means user is not in any group. Seems to be the case
       for a couple of XPs built in support / guest users. So just return */
    if (gverbose) printf("list_user_groups(): Cannot find RID under computer SID <%s>\n",s);
    return(0);
  }
  nk += 4;
  count = get_val_type(hive[H_SAM],nk,"@",TPF_VK_EXACT);
  if (count == -1) {
    printf("list_user_groups(): Cannot find value <%s\\@>\n",s);
    return(0);
  }

  if (!check) printf("User is member of %d groups:\n",count);
  
  /* This is the data size */
  size = get_val_len(hive[H_SAM],nk,"@",TPF_VK_EXACT);
  
  /* It should be 4 bytes for each group */
  if (gverbose) printf("Data size %d bytes.\n",size);
  if (size != count * 4) {
    printf("list_user_groups(): DEBUG: Size is not 4 * count! May not matter anyway. Continuing..\n");
  }
  
  m = get_val2buf(hive[H_SAM], NULL, nk, "@", 0, TPF_VK_EXACT);
  if (!m) {
    printf("list_user_groups(): Could not get value data! Giving up.\n");
    return(0);
  }
  
  grps = (unsigned int *)&m->data;
  for (i = 0; i < count; i++) {
    grp = grps[i];
    if (!check) printf("%08x ",grp);

    if (grp == 0x220) isadmin = 1;

    if (!check) {
      snprintf(g,180,"\\SAM\\Domains\\Builtin\\Aliases\\%08X\\C",grp);
      c = get_val2buf(hive[H_SAM], NULL, 0, g, 0, TPF_VK_EXACT);
      if (c) {
	cd = (struct group_C *)&c->data;
	grpnamoffs = cd->grpname_ofs + 0x34;
	grpnamlen  = cd->grpname_len;
	
	cheap_uni2ascii((char *)cd + grpnamoffs, groupname, grpnamlen);
	
	printf("= %s (which has %d members)\n",groupname,cd->grp_members);
	
      } else {
	printf("Group info for %x not found!\n",grp);
      }
    }
  }
  return(isadmin);
}



/* Promote user into administrators group (group ID 0x220)
 * And remove from all others...
 * rid   - users rid
 * no returns yet
 * THIS IS VERY HACKISH YET
 */

void promote_user(int rid)
{
  char s[200];
  char g[200];
  int nk = 0;
  struct keyval *m = NULL, *c = NULL;
  struct keyval admember = { 4, 0x220 };
  unsigned int *grps, *gcnts;
  int count = 0;
  int i, size, grp;

  if (!rid || (H_SAM < 0)) return;
  
  
  /* Get member list for user. Go for the first full SID, it's usually local computer I hope */
  snprintf(s,180,"\\SAM\\Domains\\Builtin\\Aliases\\Members\\S-1-5-21-\\%08X",rid);
  /* Now, the TYPE field is the number of groups the user is member of */
  /* Don't we just love the inconsistent use of fields!! */
  nk = trav_path(hive[H_SAM], 0, s, 0);
  if (!nk) {
    printf("Cannot find path <%s>\n",s);
    return;
  }
  nk += 4;
  count = get_val_type(hive[H_SAM],nk,"@",TPF_VK);
  if (count == -1) {
    printf("Cannot find value <%s\\@>\n",s);
    return;
  }
  printf("User is member of %d groups.\n",count);
  
  /* This is the data size */
  size = get_val_len(hive[H_SAM],nk,"@",TPF_VK);
  
  /* It should be 4 bytes for each group */
  if (size != count * 4) {
    printf("DEBUG: Data size %d bytes.\n",size);
    printf("DEBUG: Size is not 4 * count! May not matter anyway. Continuing..\n");
  }
  
  m = get_val2buf(hive[H_SAM], NULL, nk, "@", 0, TPF_VK);
  if (!m) {
    printf("Could not get value data! Giving up.\n");
    return;
  }
  
  printf("User was member of groups: ");
  grps = (unsigned int *)&m->data;
  for (i = 0; i < count; i++) {
    grp = grps[i];
    printf("%08x ",grp);
    switch (grp) {
    case 0x220: printf("=Administrators, "); break;
    case 0x221: printf("=Users, "); break;
    case 0x222: printf("=Guests, "); break;
    default: printf(", "); break;
    }
    snprintf(g,180,"\\SAM\\Domains\\Builtin\\Aliases\\%08X\\C",grp);
    c = get_val2buf(hive[H_SAM], NULL, 0, g, 0, TPF_VK);
    if (c) {
      gcnts = (unsigned int *)&c->data;
      gcnts[0xc]--;
      /* Decrease members counter */
      put_buf2val(hive[H_SAM], c, 0, g, 0, TPF_VK);
    } else {
      printf("Group info for %x not found!\n",grp);
    }
  }
#if 1
  printf("\nDeleting user memberships\n");
  
  del_value(hive[H_SAM], nk, "@", TPF_VK);
  
  printf("Adding into only administrators:\n");
  
  if (!add_value(hive[H_SAM], nk, "@", 1)) { /* Type is # of groups, here 1 */
    printf("Failed to add @ value to key\n");
  }
#endif
  put_buf2val(hive[H_SAM], &admember, nk, "@", 0, TPF_VK);
  
  /* Now bumb up administrator groups count */
  c = get_val2buf(hive[H_SAM], NULL, 0, "\\SAM\\Domains\\Builtin\\Aliases\\00000220\\C", 0, TPF_VK);
  if (!c) printf("Group info for 220 (adm) not found!\n");
  gcnts = (unsigned int *)&c->data;
  gcnts[0xc]++;
  put_buf2val(hive[H_SAM], c, 0, "\\SAM\\Domains\\Builtin\\Aliases\\00000220\\C", 0, TPF_VK);
  
  printf("Promotion DONE!\n");
  
}




/* Decode the V-struct, and change the password
 * vofs - offset into SAM buffer, start of V struct
 * rid - the users RID, required for the DES decrypt stage
 *
 * Some of this is ripped & modified from pwdump by Jeremy Allison
 * 
 */
char *change_pw(char *buf, int rid, int vlen, int stat)
{
   
   uchar x1[] = {0x4B,0x47,0x53,0x21,0x40,0x23,0x24,0x25};
   char yn[4];
   int pl;
   char *vp;
   static char username[128],fullname[128];
   char comment[128],homedir[128],md4[32],lanman[32];
   char newunipw[34], newp[20], despw[20], newlanpw[16], newlandes[20];
   int username_offset,username_len;
   int fullname_offset,fullname_len;
   int comment_offset,comment_len;
   int homedir_offset,homedir_len;
   int ntpw_len,lmpw_len,ntpw_offs,lmpw_offs,i;
   int dontchange = 0;
   struct user_V *v;

   des_key_schedule ks1, ks2;
   des_cblock deskey1, deskey2;

   MD4_CTX context;
   unsigned char digest[16];
   unsigned short acb;

   v = (struct user_V *)buf;
   vp = buf;
 
   username_offset = v->username_ofs;
   username_len    = v->username_len; 
   fullname_offset = v->fullname_ofs;
   fullname_len    = v->fullname_len;
   comment_offset  = v->comment_ofs;
   comment_len     = v->comment_len;
   homedir_offset  = v->homedir_ofs;
   homedir_len     = v->homedir_len;
   lmpw_offs       = v->lmpw_ofs;
   lmpw_len        = v->lmpw_len;
   ntpw_offs       = v->ntpw_ofs;
   ntpw_len        = v->ntpw_len;

   if (!rid) {
     printf("No RID given. Unable to change passwords..\n");
     return(0);
   }

   if (gverbose) {
     printf("lmpw_offs: 0x%x, lmpw_len: %d (0x%x)\n",lmpw_offs,lmpw_len,lmpw_len);
     printf("ntpw_offs: 0x%x, ntpw_len: %d (0x%x)\n",ntpw_offs,ntpw_len,ntpw_len);
   }

   *username = 0;
   *fullname = 0;
   *comment = 0;
   *homedir = 0;
   
   if(username_len <= 0 || username_len > vlen ||
      username_offset <= 0 || username_offset >= vlen ||
      comment_len < 0 || comment_len > vlen   ||
      fullname_len < 0 || fullname_len > vlen ||
      homedir_offset < 0 || homedir_offset >= vlen ||
      comment_offset < 0 || comment_offset >= vlen ||
      lmpw_offs < 0 || lmpw_offs >= vlen)
     {
	if (stat != 1) printf("change_pw: Not a legal V struct? (negative struct lengths)\n");
	return(NULL);
     }

   /* Offsets in top of struct is relative to end of pointers, adjust */
   username_offset += 0xCC;
   fullname_offset += 0xCC;
   comment_offset += 0xCC;
   homedir_offset += 0xCC;
   ntpw_offs += 0xCC;
   lmpw_offs += 0xCC;
   
   cheap_uni2ascii(vp + username_offset,username,username_len);
   cheap_uni2ascii(vp + fullname_offset,fullname,fullname_len);
   cheap_uni2ascii(vp + comment_offset,comment,comment_len);
   cheap_uni2ascii(vp + homedir_offset,homedir,homedir_len);
   
#if 0
   /* Reset hash-lengths to 16 if syskey has been reset */
   if (syskeyreset && ntpw_len > 16 && !stat) {
     ntpw_len = 16;
     lmpw_len = 16;
     ntpw_offs -= 4;
     (unsigned int)*(vp+0xa8) = ntpw_offs - 0xcc;
     *(vp + 0xa0) = 16;
     *(vp + 0xac) = 16;
   }
#endif

   if (stat) {
     acb = handle_F(rid,0);
      printf("| %04x | %-30.30s | %-6s | %-8s |\n",
	     rid, username, (list_user_groups(rid,1) ? "ADMIN" : "") , (  acb & 0x8000 ? "dis/lock" : (ntpw_len < 16) ? "*BLANK*" : "")  );
      return(username);
   }

   printf("\nRID     : %04d [%04x]\n",rid,rid);
   printf("Username: %s\n",username);
   printf("fullname: %s\n",fullname);
   printf("comment : %s\n",comment);
   printf("homedir : %s\n\n",homedir);
   
   list_user_groups(rid,0);
   printf("\n");

   acb = handle_F(rid,1);

   if (lmpw_len < 16 && gverbose) {
      printf("** LANMAN password not set. User MAY have a blank password.\n** Usually safe to continue. Normal in Vista\n");
   }

   if (ntpw_len < 16) {
      printf("** No NT MD4 hash found. This user probably has a BLANK password!\n");
      if (lmpw_len < 16) {
	printf("** No LANMAN hash found either. Sorry, cannot change. Try login with no password!\n");
	dontchange = 1;
      } else {
	printf("** LANMAN password IS however set. Will now install new password as NT pass instead.\n");
	printf("** NOTE: Continue at own risk!\n");
	ntpw_offs = lmpw_offs;
	*(vp+0xa8) = ntpw_offs - 0xcc;
	ntpw_len = 16;
	lmpw_len = 0;
      }
   }
   
   if (gverbose) {
     hexprnt("Crypted NT pw: ",(unsigned char *)(vp+ntpw_offs),16);
     hexprnt("Crypted LM pw: ",(unsigned char *)(vp+lmpw_offs),16);
   }

   /* Get the two decrpt keys. */
   sid_to_key1(rid,(unsigned char *)deskey1);
   des_set_key((des_cblock *)deskey1,ks1);
   sid_to_key2(rid,(unsigned char *)deskey2);
   des_set_key((des_cblock *)deskey2,ks2);
   
   /* Decrypt the NT md4 password hash as two 8 byte blocks. */
   des_ecb_encrypt((des_cblock *)(vp+ntpw_offs ),
		   (des_cblock *)md4, ks1, DES_DECRYPT);
   des_ecb_encrypt((des_cblock *)(vp+ntpw_offs + 8),
		   (des_cblock *)&md4[8], ks2, DES_DECRYPT);

   /* Decrypt the lanman password hash as two 8 byte blocks. */
   des_ecb_encrypt((des_cblock *)(vp+lmpw_offs),
		   (des_cblock *)lanman, ks1, DES_DECRYPT);
   des_ecb_encrypt((des_cblock *)(vp+lmpw_offs + 8),
		   (des_cblock *)&lanman[8], ks2, DES_DECRYPT);
      
   if (gverbose) {
     hexprnt("MD4 hash     : ",(unsigned char *)md4,16);
     hexprnt("LANMAN hash  : ",(unsigned char *)lanman,16);
   }

   printf("\n- - - - User Edit Menu:\n");
   printf(" 1 - Clear (blank) user password\n"
	  " 2 - Edit (set new) user password (careful with this on XP or Vista)\n"
	  " 3 - Promote user (make user an administrator)\n");
   printf("%s4 - Unlock and enable user account%s\n", (acb & 0x8000) ? " " : "(", 
	  (acb & 0x8000) ? " [probably locked now]" : ") [seems unlocked already]");
   printf(" q - Quit editing user, back to user select\n");

   pl = fmyinput("Select: [q] > ",newp,16);

   if ( (pl < 1) || (*newp == 'q') || (*newp == 'Q')) return(0);

   if (*newp == '3') {
     printf("NOTE: This function is still experimental, and in some cases it\n"
	    "      may result in stangeness when editing user/group in windows.\n"
	    "      Also, users (like Guest often is) may still be prevented\n"
	    "      from login via security/group policies which is not changed.\n");
     fmyinput("Do you still want to promote the user? (y/n) [n] ",yn,2);
     if (*yn == 'y' || *yn == 'Y') {
       promote_user(rid);
     }
     return(username);
   }

   if (*newp == '4') {
     acb = handle_F(rid,2);
     return(username);
   }

   if (*newp == '2') {

     if (dontchange) {
       printf("Sorry, unable to edit since password seems blank already (thus no space for it)\n");
       return(0);
     }

     pl = fmyinput("New Password: ",newp,16);

     if (pl < 1) {
       printf("No change.\n");
       return(0);
     }

     cheap_ascii2uni(newp,newunipw,pl);
   
     make_lanmpw(newp,newlanpw,pl);

     /*   printf("Ucase Lanman: %s\n",newlanpw); */
   
     MD4Init (&context);
     MD4Update (&context, newunipw, pl<<1);
     MD4Final (digest, &context);
     
     if (gverbose) hexprnt("\nNEW MD4 hash    : ",digest,16);
     
     E1((uchar *)newlanpw,   x1, (uchar *)lanman);
     E1((uchar *)newlanpw+7, x1, (uchar *)lanman+8);
     
     if (gverbose) hexprnt("NEW LANMAN hash : ",(unsigned char *)lanman,16);
     
     /* Encrypt the NT md4 password hash as two 8 byte blocks. */
     des_ecb_encrypt((des_cblock *)digest,
		     (des_cblock *)despw, ks1, DES_ENCRYPT);
     des_ecb_encrypt((des_cblock *)(digest+8),
		     (des_cblock *)&despw[8], ks2, DES_ENCRYPT);
     
     des_ecb_encrypt((des_cblock *)lanman,
		     (des_cblock *)newlandes, ks1, DES_ENCRYPT);
     des_ecb_encrypt((des_cblock *)(lanman+8),
		     (des_cblock *)&newlandes[8], ks2, DES_ENCRYPT);
     
     if (gverbose) {
       hexprnt("NEW DES crypt   : ",(unsigned char *)despw,16);
       hexprnt("NEW LANMAN crypt: ",(unsigned char *)newlandes,16);
     }

     /* Reset hash length to 16 if syskey enabled, this will cause
      * a conversion to syskey-hashes upon next boot */
     if (syskeyreset && ntpw_len > 16) { 
       ntpw_len = 16;
       lmpw_len = 16;
       ntpw_offs -= 4;
       *(vp+0xa8) = (unsigned int)(ntpw_offs - 0xcc);
       *(vp + 0xa0) = 16;
       *(vp + 0xac) = 16;
     }
     
     for (i = 0; i < 16; i++) {
       *(vp+ntpw_offs+i) = (unsigned char)despw[i];
       if (lmpw_len >= 16) *(vp+lmpw_offs+i) = (unsigned char)newlandes[i];
     }

     printf("Password changed!\n");


   } /* new password */

   else if (pl == 1 && *newp == '1') {
     /* Setting hash lengths to zero seems to make NT think it is blank
      * However, since we cant cut the previous hash bytes out of the V value
      * due to missing resize-support of values, it may leak about 40 bytes
      * each time we do this.
      */
     v->ntpw_len = 0;
     v->lmpw_len = 0;

     printf("Password cleared!\n");
   }
   
#if 0
   hexprnt("Pw in buffer: ",(vp+ntpw_offs),16);
   hexprnt("Lm in buffer: ",(vp+lmpw_offs),16);
#endif
   dirty = 1;
   return(username);
}


/* Registry edit wrapper */

void mainloop(void)
{
  regedit_interactive(hive, no_hives);
}


/* List users in SAM file
 * pageit - hmm.. forgot this one for this release..
 */

int list_users(int pageit)
{
  char s[200];
  struct keyval *v;
  int nkofs /* ,vkofs */ ;
  int rid;
  int count = 0, countri = 0;
  struct ex_data ex;

  if (H_SAM < 0) return(1);
  nkofs = trav_path(hive[H_SAM], 0,"\\SAM\\Domains\\Account\\Users\\Names\\",0);
  if (!nkofs) {
    printf("list_users: Cannot find usernames in registry! (is this a SAM-hive?)\n");
    return(1);
  }

  printf("| RID -|---------- Username ------------| Admin? |- Lock? --|\n");

  while ((ex_next_n(hive[H_SAM], nkofs+4, &count, &countri, &ex) > 0)) {

    /* Extract the value out of the username-key, value is RID  */
    snprintf(s,180,"\\SAM\\Domains\\Account\\Users\\Names\\%s\\@",ex.name);
    rid = get_dword(hive[H_SAM], 0, s, TPF_VK_EXACT);
    if (rid == 500) strncpy(admuser,ex.name,128); /* Copy out admin-name */

    /*    printf("name: %s, rid: %d (0x%0x)\n", ex.name, rid, rid); */

    /* Now that we have the RID, build the path to, and get the V-value */
    snprintf(s,180,"\\SAM\\Domains\\Account\\Users\\%08X\\V",rid);
    v = get_val2buf(hive[H_SAM], NULL, 0, s, REG_BINARY, TPF_VK_EXACT);
    if (!v) {
      printf("Cannot find value <%s>\n",s);
      return(1);
    }
    
    if (v->len < 0xcc) {
      printf("list_users: Value <%s> is too short (only %d bytes) to be a SAM user V-struct!\n",
	     s, v->len);
    } else {
      change_pw( (char *)&v->data , rid, v->len, 1);
    }
    FREE(v);
    FREE(ex.name);
  }
  return(0);
}


/* Find a username in the SAM registry, then get it's V-value,
 * and feed it to the password changer.
 */

void find_n_change(char *username)
{
  char s[200];
  struct vk_key *vkkey;
  struct keyval *v;
  int rid = 0;

  if ((H_SAM < 0) || (!username)) return;
  if (*username == '0' && *(username+1) == 'x') sscanf(username,"%i",&rid);
  
  if (!rid) { /* Look up username */
    /* Extract the unnamed value out of the username-key, value is RID  */
    snprintf(s,180,"\\SAM\\Domains\\Account\\Users\\Names\\%s\\@",username);
    rid = get_dword(hive[H_SAM],0,s, TPF_VK_EXACT);
    if (rid == -1) {
      printf("Cannot find value <%s>\n",s);
      return;
    }
  }

  /*
  printf("Username: %s, RID = %d (0x%0x)\n",username,rid,rid);
  */

  /* Now that we have the RID, build the path to, and get the V-value */
  snprintf(s,180,"\\SAM\\Domains\\Account\\Users\\%08X\\V",rid);
  v = get_val2buf(hive[H_SAM], NULL, 0, s, REG_BINARY, TPF_VK_EXACT);
  if (!v) {
    printf("Cannot find value <%s>\n",s);
    return;
  }

  if (v->len < 0xcc) {
    printf("Value <%s> is too short (only %d bytes) to be a SAM user V-struct!\n",
	   s, vkkey->len_data);
  } else {
    change_pw( (char *)&v->data , rid, v->len, 0);
    if (dirty) {
      if (!(put_buf2val(hive[H_SAM], v, 0, s, REG_BINARY, TPF_VK_EXACT))) {
	printf("Failed to write updated <%s> to registry! Password change not completed!\n",s);
      }
    }
  }
  FREE(v);
}

/* Check for presence of syskey and possibly disable it if
 * user wants it.
 * This is tricky, and extremely undocumented!
 * See docs for more info on what's going on when syskey is installed
 */

#undef LSADATA

void handle_syskey(void)
{

  /* This is \SAM\Domains\Account\F */
  struct samkeyf {
    char unknown[0x50];       /* 0x0000 - Unknown. May be machine SID */
    char unknown2[0x14];
    char syskeymode;          /* 0x0064 - Type/mode of syskey in use     */
    char syskeyflags1[0xb];   /* 0x0065 - More flags/settings            */
    char syskeyobf[0x30];     /* 0x0070 - This may very well be the obfuscated syskey */
  };    /* There may be more, usually 8 null-bytes? */

  /* Security\Policy\SecretEncryptionKey\@, only on NT5 */
  /* Probably contains some keyinfo for syskey. Second DWORD seems to be syskeymode */
  struct secpoldata {
    int  unknown1;             /* Some kind of flag? usually 1 */
    int  syskeymode;           /* Is this what we're looking for? */
    int  unknown2;             /* Usually 0? */
    char keydata[0x40];        /* Some kind of scrambled keydata? */
  };

#ifdef LSADATA
  /* SYSTEM\CurrentControlSet\Control\Lsa\Data, only on NT5?? */
  /* Probably contains some keyinfo for syskey. Byte 0x34 seems to be mode */
  struct lsadata {
    char keydata[0x34];        /* Key information */
    int  syskeymode;           /* Is this what we're looking for? */
  };
#endif

  /* void *fdata; */
  struct samkeyf *ff = NULL;
  struct secpoldata *sf = NULL;
  /* struct lsadata *ld = NULL; */
  int /* len, */ i,secboot, samfmode, secmode /* , ldmode */ ;
  struct keyval *samf, *secpol /* , *lsad */ ;
  char *syskeytypes[4] = { "off", "key-in-registry", "enter-passphrase", "key-on-floppy" }; 
  char yn[5];

  printf("\n---------------------> SYSKEY CHECK <-----------------------\n");


  if (H_SAM < 0) {
    printf("ERROR: SAM hive not loaded!\n");
    return;
  }
  samf = get_val2buf(hive[H_SAM], NULL, 0, "\\SAM\\Domains\\Account\\F", REG_BINARY, TPF_VK_EXACT);

  if (samf && samf->len > 0x70 ) {
    ff = (struct samkeyf *)&samf->data;
    samfmode = ff->syskeymode;
  } else {
    samfmode = -1;
  }

  secboot = -1;
  if (H_SYS >= 0) {
    secboot = get_dword(hive[H_SYS], 0, "\\ControlSet001\\Control\\Lsa\\SecureBoot", TPF_VK_EXACT);
  }

  secmode = -1;
  if (H_SEC >=0) {
    secpol = get_val2buf(hive[H_SEC], NULL, 0, "\\Policy\\PolSecretEncryptionKey\\@", REG_NONE, TPF_VK_EXACT);
    if (secpol) {     /* Will not be found in NT 4, take care of that */
      sf = (struct secpoldata *)&secpol->data;
      secmode = sf->syskeymode;
    }
  }

#ifdef LSADATA
  lsad = get_val2buf(hive[H_SYS], NULL, 0, "\\ControlSet001\\Control\\Lsa\\Data\\Pattern", REG_BINARY, TPF_VK_EXACT);

  if (lsad && lsad->len >= 0x38) {
    ld = (struct lsadata *)&lsad->data;
    ldmode = ld->syskeymode;
  } else {
    ldmode = -1;
  }
#endif

  printf("SYSTEM   SecureBoot            : %d -> %s\n", secboot,
	 (secboot < 0 || secboot > 3) ? "Not Set (not installed, good!)" : syskeytypes[secboot]);
  printf("SAM      Account\\F             : %d -> %s\n", samfmode,
	 (samfmode < 0 || samfmode > 3) ? "Not Set" : syskeytypes[samfmode]);
  printf("SECURITY PolSecretEncryptionKey: %d -> %s\n", secmode,
	 (secmode < 0 || secmode > 3) ? "Not Set (OK if this is NT4)" : syskeytypes[secmode]);

#ifdef LSADATA
  printf("SYSTEM   LsaData               : %d -> %s\n\n", ldmode,
	 (ldmode < 0 || ldmode > 3) ? "Not Set (strange?)" : syskeytypes[ldmode]);
#endif

  if (secboot != samfmode && secboot != -1) {
    printf("WARNING: Mismatch in syskey settings in SAM and SYSTEM!\n");
    printf("WARNING: It may be dangerous to continue (however, resetting syskey\n");
    printf("         may very well fix the problem)\n");
  }

  if (secboot > 0 || samfmode > 0) {
    printf("\n***************** SYSKEY IS ENABLED! **************\n");
    printf("This installation very likely has the syskey passwordhash-obfuscator installed\n");
    printf("It's currently in mode = %d, %s-mode\n",secboot,
	   (secboot < 0 || secboot > 3) ? "Unknown" : syskeytypes[secboot]);

    if (no_hives < 2) {
      printf("\nSYSTEM (and possibly SECURITY) hives not loaded, unable to disable syskey!\n");
      printf("Please start the program with at least SAM & SYSTEM-hive filenames as arguments!\n\n");
      return;
    }
    printf("SYSKEY is on! However, DO NOT DISABLE IT UNLESS YOU HAVE TO!\n");
    printf("This program can change passwords even if syskey is on, however\n");
    printf("if you have lost the key-floppy or passphrase you can turn it off,\n");
    printf("but please read the docs first!!!\n");
    printf("\n** IF YOU DON'T KNOW WHAT SYSKEY IS YOU DO NOT NEED TO SWITCH IT OFF!**\n");
    printf("NOTE: On WINDOWS 2000 and XP it will not be possible\n");
    printf("to turn it on again! (and other problems may also show..)\n\n");
    printf("EXTREME WARNING: Do not try this on Vista, it will go into endless re-boots\n\n");
    printf("NOTE: Disabling syskey will invalidate ALL\n");
    printf("passwords, requiring them to be reset. You should at least reset the\n");
    printf("administrator password using this program, then the rest ought to be\n");
    printf("done from NT.\n");

    fmyinput("\nDo you really wish to disable SYSKEY? (y/n) [n] ",yn,2);
    if (*yn == 'y') {
      /* Reset SAM syskey infostruct, fill with zeroes */
      if (ff) { 
	ff->syskeymode = 0;

	for (i = 0; i < 0x3b; i++) {
	  ff->syskeyflags1[i] = 0;
	}

	put_buf2val(hive[H_SAM], samf, 0, "\\SAM\\Domains\\Account\\F", REG_BINARY, TPF_VK_EXACT);

      }
      /* Reset SECURITY infostruct (if any) */
      if (sf) { 
	memset(sf, 0, secpol->len);
	sf->syskeymode = 0;

	put_buf2val(hive[H_SEC], secpol, 0, "\\Policy\\PolSecretEncryptionKey\\@", REG_BINARY, TPF_VK_EXACT);

      }

#if LSADATA
      if (ld) { 

	ld->syskeymode = 0;

	put_buf2val(hive[H_SYS], lsad, 0, "\\ControlSet001\\Control\\Lsa\\Data\\Pattern", REG_BINARY, TPF_VK_EXACT);

      }
#endif

      /* And SYSTEM SecureBoot parameter */

      put_dword(hive[H_SYS], 0, "\\ControlSet001\\Control\\Lsa\\SecureBoot", TPF_VK_EXACT, 0);

      dirty = 1;
      syskeyreset = 1;
      printf("Updating passwordhash-lengths..\n");
      list_users(1);
      printf("* SYSKEY RESET!\nNow please set new administrator password!\n");
    } else {

      syskeyreset = 1;
    }
  } else {
    printf("Syskey not installed!\n");
    return;
  }

}


/* Interactive user edit */
void useredit(void)
{
  char iwho[100];
  int il;

  printf("\n\n===== chntpw Edit User Info & Passwords ====\n\n");

  if (H_SAM < 0) {
    printf("ERROR: SAM registry file (which contains user data) is not loaded!\n\n");
    return;
  }


  list_users(1);
  
  while (1) {
    printf("\nSelect: ! - quit, . - list users, 0x<RID> - User with RID (hex)\n");
    printf("or simply enter the username to change: [%s] ",admuser);
    il = fmyinput("",iwho,32);
    if (il == 1 && *iwho == '.') { printf("\n"); list_users(1); continue; }
    if (il == 1 && *iwho == '!') return;
    if (il == 0) strcpy(iwho,admuser);
    find_n_change(iwho);
  }

}


void recoveryconsole()
{

  int cmd = 0;
  int sec = 0;
  static char *scpath = "\\Microsoft\\Windows NT\\CurrentVersion\\Setup\\RecoveryConsole\\SetCommand";
  static char *slpath = "\\Microsoft\\Windows NT\\CurrentVersion\\Setup\\RecoveryConsole\\SecurityLevel";
  char yn[5];

  if (H_SOF < 0) {
    printf("\nSOFTWARE-hive not loaded, and there's where RecoveryConsole settings are..\n");
    return;
  }

  cmd = get_dword(hive[H_SOF],0,scpath,TPF_VK_EXACT);
  sec = get_dword(hive[H_SOF],0,slpath,TPF_VK_EXACT);

  if (cmd == -1 && sec == -1) {
    printf("\nDid not find registry entries for RecoveryConsole.\n(RecoveryConsole is only in Windows 2000 and XP, not Vista)\n");
    return;
  }

  printf("\nRecoveryConsole:\n- Extended SET command is \t%s\n", cmd>0 ? "ENABLED (1)" : "DISABLED (0)");
  printf("- Administrator password login: %s\n", sec>0 ? "SKIPPED (1)" : "ENFORCED (0)");

  fmyinput("\nDo you want to change it? (y/n) [n] ",yn,2);
  if (*yn == 'y') {
    cmd ^= 1;
    sec ^= 1;
    if (!put_dword(hive[0], 0, scpath, TPF_VK_EXACT, cmd)) printf("Update of SET level failed registry edit\n");
    if (!put_dword(hive[0], 0, slpath, TPF_VK_EXACT, sec)) printf("Update of login level failed registry edit\n");
    printf("Done!\n");
  }

}


/* Interactive menu system */

void interactive(void)
{
  int il;
  char inbuf[20];

  while(1) {
    printf("\n\n<>========<> chntpw Main Interactive Menu <>========<>\n\n"
	   "Loaded hives:");
    for (il = 0; il < no_hives; il++) {
      printf(" <%s>",hive[il]->filename);
    }
    printf("\n\n  1 - Edit user data and passwords\n"
	   "  2 - Syskey status & change\n"
	   "  3 - RecoveryConsole settings\n"
	   "      - - -\n"
	   "  9 - Registry editor, now with full write support!\n"
	   "  q - Quit (you will be asked if there is something to save)\n"
	   "\n\n");

    il = fmyinput("What to do? [1] -> ", inbuf, 10);
    
    if (!il) useredit();
    if (il) {
      switch(inbuf[0]) {
      case '1': useredit(); break;
      case '2': handle_syskey(); break;
      case '3': recoveryconsole(); break;
      case '9': mainloop(); break;
      case 'q': return; break;
      }
    }
  }
}

  

void usage(void) {
   printf("chntpw: change password of a user in a NT/2k/XP/2k3/Vista SAM file, or invoke registry editor.\n"
	  "chntpw [OPTIONS] <samfile> [systemfile] [securityfile] [otherreghive] [...]\n"
	  " -h          This message\n"
	  " -u <user>   Username to change, Administrator is default\n"
	  " -l          list all users in SAM file\n"
	  " -i          Interactive. List users (as -l) then ask for username to change\n"
	  " -e          Registry editor. Now with full write support!\n"
	  " -d          Enter buffer debugger instead (hex editor), \n"
          " -t          Trace. Show hexdump of structs/segments. (deprecated debug function)\n"
          " -v          Be a little more verbose (for debuging)\n"
	  " -L          Write names of changed files to /tmp/changed\n"
	  " -N          No allocation mode. Only (old style) same length overwrites possible\n"
          "See readme file on how to get to the registry files, and what they are.\n"
          "Source/binary freely distributable under GPL v2 license. See README for details.\n"
          "NOTE: This program is somewhat hackish! You are on your own!\n"
	  );
}

int main(int argc, char **argv)
{
   
   int dodebug = 0, list = 2, inter = 0,edit = 0,il,d = 0, dd = 0, logchange = 0, mode = 0;
   extern int /* opterr, */ optind;
   extern char* optarg;
   char *filename,c;
   char *who = "Administrator";
   char iwho[100];
   FILE *ch;     /* Write out names of touched files to this */
   
   char *options = "LNidehltvu:";
   
   printf("%s\n",chntpw_version);
   while((c=getopt(argc,argv,options)) > 0) {
      switch(c) {
       case 'd': dodebug = 1; break;
       case 'e': edit = 1; break;
       case 'L': logchange = 1; break;
       case 'N': mode |= HMODE_NOALLOC; break;
       case 'l': list = 1; who = 0; break;
       case 't': list = 3; who = 0; mode |= HMODE_TRACE; break;
       case 'v': mode |= HMODE_VERBOSE; gverbose = 1; break;
       case 'i': list = 2; who = 0; inter = 1; break;
       case 'u': who = optarg; list = 2; break;
       case 'h': usage(); exit(0); break;
       default: usage(); exit(1); break;
      }
   }
   filename=argv[optind];
   if (!filename || !*filename) {
      usage(); exit(1);
   }
   do {
     if (!(hive[no_hives] = openHive(filename,
				     HMODE_RW|mode))) {
       printf("Unable to open/read a hive, exiting..\n");
       exit(1);
     }
     switch(hive[no_hives]->type) {
       case HTYPE_SAM:      H_SAM = no_hives; break;
       case HTYPE_SOFTWARE: H_SOF = no_hives; break;
       case HTYPE_SYSTEM:   H_SYS = no_hives; break;
       case HTYPE_SECURITY: H_SEC = no_hives; break;
     }
     no_hives++;
     filename = argv[optind+no_hives];
   } while (filename && *filename && no_hives < MAX_HIVES);
      
   if (dodebug) debugit(hive[0]->buffer,hive[0]->size);
   else {

     check_get_samdata();
     if (list && !edit && !inter) {
       if ( list_users(1) ) edit = 1;
     }
     if (edit) mainloop();
     else if (who) { handle_syskey(); find_n_change(who); }

     if (inter) interactive();
   }
   
   if (list != 1) {
     printf("\nHives that have changed:\n #  Name\n");
     for (il = 0; il < no_hives; il++) {
       if (hive[il]->state & HMODE_DIRTY) {
	 if (!logchange) printf("%2d  <%s>\n",il,hive[il]->filename);
	 d = 1;
       }
     }
     if (d) {
       /* Only prompt user if logging of changed files has not been set */
       /* Thus we assume confirmations are done externally if they ask for a list of changes */
       if (!logchange) fmyinput("Write hive files? (y/n) [n] : ",iwho,3);
       if (*iwho == 'y' || logchange) {
	 if (logchange) {
	   ch = fopen("/tmp/changed","w");
	 }
	 for (il = 0; il < no_hives; il++) {
	   if (hive[il]->state & HMODE_DIRTY) {
	     printf("%2d  <%s> - ",il,hive[il]->filename);
	     if (!writeHive(hive[il])) {
	       printf("OK\n");
	       if (logchange) fprintf(ch,"%s ",hive[il]->filename);
	       dd = 2;
	     }
	   }
	 }
	 if (logchange) {
	   fprintf(ch,"\n");
	   fclose(ch);
	 }
       } else {
	 printf("Not written!\n\n");
       }
     } else {
       printf("None!\n\n");
     }
   } /* list only check */
   return(dd);
}