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https://github.com/samba-team/samba.git
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2b9fb9618a
- check for overflow (very unlikely) in random buffer generation
(This used to be commit 548ec1efef
)
537 lines
15 KiB
C
537 lines
15 KiB
C
/*
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Unix SMB/CIFS implementation.
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SMB parameters and setup
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Copyright (C) Andrew Tridgell 1992-1998
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Modified by Jeremy Allison 1995.
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Copyright (C) Jeremy Allison 1995-2000.
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Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "byteorder.h"
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/*
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This implements the X/Open SMB password encryption
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It takes a password ('unix' string), a 8 byte "crypt key"
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and puts 24 bytes of encrypted password into p24 */
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void SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24])
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{
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uchar p21[21];
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memset(p21,'\0',21);
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E_deshash(passwd, p21);
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SMBOWFencrypt(p21, c8, p24);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
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dump_data(100, (char *)p21, 16);
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dump_data(100, (const char *)c8, 8);
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dump_data(100, (char *)p24, 24);
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#endif
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}
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/**
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* Creates the MD4 Hash of the users password in NT UNICODE.
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* @param passwd password in 'unix' charset.
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* @param p16 return password hashed with md4, caller allocated 16 byte buffer
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*/
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void E_md4hash(const char *passwd, uchar p16[16])
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{
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int len;
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smb_ucs2_t wpwd[129];
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/* Password must be converted to NT unicode - null terminated. */
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push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE);
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/* Calculate length in bytes */
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len = strlen_w(wpwd) * sizeof(int16);
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mdfour(p16, (unsigned char *)wpwd, len);
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ZERO_STRUCT(wpwd);
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}
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/**
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* Creates the DES forward-only Hash of the users password in DOS ASCII charset
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* @param passwd password in 'unix' charset.
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* @param p16 return password hashed with DES, caller allocated 16 byte buffer
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*/
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void E_deshash(const char *passwd, uchar p16[16])
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{
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fstring dospwd;
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ZERO_STRUCT(dospwd);
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/* Password must be converted to DOS charset - null terminated, uppercase. */
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push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
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/* Only the fisrt 14 chars are considered, password need not be null terminated. */
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E_P16((const unsigned char *)dospwd, p16);
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ZERO_STRUCT(dospwd);
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}
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/**
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* Creates the MD4 and DES (LM) Hash of the users password.
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* MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
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* @param passwd password in 'unix' charset.
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* @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
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* @param p16 return password hashed with des, caller allocated 16 byte buffer
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*/
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/* Does both the NT and LM owfs of a user's password */
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void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16])
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{
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/* Calculate the MD4 hash (NT compatible) of the password */
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memset(nt_p16, '\0', 16);
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E_md4hash(pwd, nt_p16);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
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dump_data(120, pwd, strlen(pwd));
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dump_data(100, (char *)nt_p16, 16);
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#endif
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E_deshash(pwd, (uchar *)p16);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
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dump_data(120, pwd, strlen(pwd));
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dump_data(100, (char *)p16, 16);
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#endif
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}
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/* Does both the NTLMv2 owfs of a user's password */
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BOOL ntv2_owf_gen(const uchar owf[16],
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const char *user_in, const char *domain_in, uchar kr_buf[16])
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{
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smb_ucs2_t *user;
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smb_ucs2_t *domain;
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size_t user_byte_len;
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size_t domain_byte_len;
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HMACMD5Context ctx;
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user_byte_len = push_ucs2_allocate(&user, user_in);
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if (user_byte_len == (size_t)-1) {
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DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n"));
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return False;
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}
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domain_byte_len = push_ucs2_allocate(&domain, domain_in);
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if (domain_byte_len == (size_t)-1) {
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DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n"));
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return False;
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}
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strupper_w(user);
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strupper_w(domain);
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SMB_ASSERT(user_byte_len >= 2);
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SMB_ASSERT(domain_byte_len >= 2);
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/* We don't want null termination */
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user_byte_len = user_byte_len - 2;
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domain_byte_len = domain_byte_len - 2;
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hmac_md5_init_limK_to_64(owf, 16, &ctx);
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hmac_md5_update((const unsigned char *)user, user_byte_len, &ctx);
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hmac_md5_update((const unsigned char *)domain, domain_byte_len, &ctx);
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hmac_md5_final(kr_buf, &ctx);
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
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dump_data(100, (const char *)user, user_byte_len);
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dump_data(100, (const char *)domain, domain_byte_len);
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dump_data(100, owf, 16);
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dump_data(100, kr_buf, 16);
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#endif
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SAFE_FREE(user);
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SAFE_FREE(domain);
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return True;
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}
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/* Does the des encryption from the NT or LM MD4 hash. */
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void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
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{
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uchar p21[21];
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ZERO_STRUCT(p21);
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memcpy(p21, passwd, 16);
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E_P24(p21, c8, p24);
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}
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/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
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void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24])
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{
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uchar p21[21];
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memset(p21,'\0',21);
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memcpy(p21, passwd, 8);
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memset(p21 + 8, 0xbd, 8);
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E_P24(p21, ntlmchalresp, p24);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
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dump_data(100, (char *)p21, 21);
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dump_data(100, (const char *)ntlmchalresp, 8);
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dump_data(100, (char *)p24, 24);
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#endif
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}
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/* Does the NT MD4 hash then des encryption. */
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void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24)
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{
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uchar p21[21];
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memset(p21,'\0',21);
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E_md4hash(passwd, p21);
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SMBOWFencrypt(p21, c8, p24);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
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dump_data(100, (char *)p21, 16);
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dump_data(100, (char *)c8, 8);
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dump_data(100, (char *)p24, 24);
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#endif
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}
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BOOL make_oem_passwd_hash(char data[516], const char *passwd,
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const uchar old_pw_hash[16],
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BOOL unicode)
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{
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int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);
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if (new_pw_len > 512)
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{
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DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
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return False;
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}
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/*
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* Now setup the data area.
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* We need to generate a random fill
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* for this area to make it harder to
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* decrypt. JRA.
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*/
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generate_random_buffer((unsigned char *)data, 516, False);
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push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len,
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STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII));
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SIVAL(data, 512, new_pw_len);
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#ifdef DEBUG_PASSWORD
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DEBUG(100,("make_oem_passwd_hash\n"));
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dump_data(100, data, 516);
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#endif
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SamOEMhash((unsigned char *)data,
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(const unsigned char *)old_pw_hash,
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516);
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return True;
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}
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/* Does the md5 encryption from the Key Response for NTLMv2. */
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void SMBOWFencrypt_ntv2(const uchar kr[16],
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const DATA_BLOB *srv_chal,
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const DATA_BLOB *cli_chal,
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uchar resp_buf[16])
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{
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HMACMD5Context ctx;
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hmac_md5_init_limK_to_64(kr, 16, &ctx);
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hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
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hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
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hmac_md5_final(resp_buf, &ctx);
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
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dump_data(100, srv_chal->data, srv_chal->length);
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dump_data(100, cli_chal->data, cli_chal->length);
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dump_data(100, resp_buf, 16);
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#endif
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}
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void SMBsesskeygen_ntv2(const uchar kr[16],
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const uchar * nt_resp, uint8 sess_key[16])
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{
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/* a very nice, 128 bit, variable session key */
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HMACMD5Context ctx;
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hmac_md5_init_limK_to_64(kr, 16, &ctx);
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hmac_md5_update(nt_resp, 16, &ctx);
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hmac_md5_final((unsigned char *)sess_key, &ctx);
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
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dump_data(100, sess_key, 16);
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#endif
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}
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void SMBsesskeygen_ntv1(const uchar kr[16],
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const uchar * nt_resp, uint8 sess_key[16])
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{
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/* yes, this session key does not change - yes, this
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is a problem - but it is 128 bits */
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mdfour((unsigned char *)sess_key, kr, 16);
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
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dump_data(100, sess_key, 16);
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#endif
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}
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void SMBsesskeygen_lmv1(const uchar lm_hash[16],
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const uchar lm_resp[24], /* only uses 8 */
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uint8 sess_key[16])
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{
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/* Calculate the LM session key (effective length 40 bits,
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but changes with each session) */
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uchar p24[24];
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uchar partial_lm_hash[16];
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memcpy(partial_lm_hash, lm_hash, 8);
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memset(partial_lm_hash + 8, 0xbd, 8);
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SMBOWFencrypt(lm_hash, lm_resp, p24);
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memcpy(sess_key, p24, 16);
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sess_key[5] = 0xe5;
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sess_key[6] = 0x38;
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sess_key[7] = 0xb0;
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("SMBsesskeygen_lmv1:\n"));
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dump_data(100, sess_key, 16);
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#endif
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}
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DATA_BLOB NTLMv2_generate_names_blob(const char *hostname,
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const char *domain)
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{
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DATA_BLOB names_blob = data_blob(NULL, 0);
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msrpc_gen(&names_blob, "aaa",
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True, NTLMSSP_NAME_TYPE_DOMAIN, domain,
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True, NTLMSSP_NAME_TYPE_SERVER, hostname,
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True, 0, "");
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return names_blob;
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}
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static DATA_BLOB NTLMv2_generate_client_data(const DATA_BLOB *names_blob)
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{
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uchar client_chal[8];
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DATA_BLOB response = data_blob(NULL, 0);
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char long_date[8];
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NTTIME nttime;
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unix_to_nt_time(&nttime, time(NULL));
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generate_random_buffer(client_chal, sizeof(client_chal), False);
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push_nttime(long_date, 0, &nttime);
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/* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
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msrpc_gen(&response, "ddbbdb",
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0x00000101, /* Header */
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0, /* 'Reserved' */
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long_date, 8, /* Timestamp */
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client_chal, 8, /* client challenge */
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0, /* Unknown */
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names_blob->data, names_blob->length); /* End of name list */
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return response;
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}
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static DATA_BLOB NTLMv2_generate_response(const uchar ntlm_v2_hash[16],
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const DATA_BLOB *server_chal,
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const DATA_BLOB *names_blob)
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{
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uchar ntlmv2_response[16];
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DATA_BLOB ntlmv2_client_data;
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DATA_BLOB final_response;
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/* NTLMv2 */
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/* generate some data to pass into the response function - including
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the hostname and domain name of the server */
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ntlmv2_client_data = NTLMv2_generate_client_data(names_blob);
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/* Given that data, and the challenge from the server, generate a response */
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SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
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final_response = data_blob(NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
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memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
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memcpy(final_response.data+sizeof(ntlmv2_response),
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ntlmv2_client_data.data, ntlmv2_client_data.length);
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data_blob_free(&ntlmv2_client_data);
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return final_response;
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}
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static DATA_BLOB LMv2_generate_response(const uchar ntlm_v2_hash[16],
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const DATA_BLOB *server_chal)
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{
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uchar lmv2_response[16];
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DATA_BLOB lmv2_client_data = data_blob(NULL, 8);
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DATA_BLOB final_response = data_blob(NULL, 24);
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/* LMv2 */
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/* client-supplied random data */
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generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length, False);
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/* Given that data, and the challenge from the server, generate a response */
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SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
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memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
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/* after the first 16 bytes is the random data we generated above,
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so the server can verify us with it */
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memcpy(final_response.data+sizeof(lmv2_response),
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lmv2_client_data.data, lmv2_client_data.length);
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data_blob_free(&lmv2_client_data);
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return final_response;
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}
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BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password,
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const DATA_BLOB *server_chal,
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const DATA_BLOB *names_blob,
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DATA_BLOB *lm_response, DATA_BLOB *nt_response,
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DATA_BLOB *nt_session_key)
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{
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uchar nt_hash[16];
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uchar ntlm_v2_hash[16];
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E_md4hash(password, nt_hash);
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/* We don't use the NT# directly. Instead we use it mashed up with
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the username and domain.
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This prevents username swapping during the auth exchange
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*/
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if (!ntv2_owf_gen(nt_hash, user, domain, ntlm_v2_hash)) {
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return False;
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}
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if (nt_response) {
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*nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal,
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names_blob);
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if (nt_session_key) {
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*nt_session_key = data_blob(NULL, 16);
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/* The NTLMv2 calculations also provide a session key, for signing etc later */
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/* use only the first 16 bytes of nt_response for session key */
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SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, nt_session_key->data);
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}
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}
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/* LMv2 */
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if (lm_response) {
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*lm_response = LMv2_generate_response(ntlm_v2_hash, server_chal);
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}
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return True;
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}
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/***********************************************************
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encode a password buffer with a unicode password. The buffer
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is filled with random data to make it harder to attack.
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************************************************************/
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BOOL encode_pw_buffer(char buffer[516], const char *password, int string_flags)
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{
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uchar new_pw[512];
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size_t new_pw_len;
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new_pw_len = push_string(NULL, new_pw,
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password,
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sizeof(new_pw), string_flags);
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if (new_pw_len > 512) {
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return False;
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}
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memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
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generate_random_buffer((unsigned char *)buffer, 512 - new_pw_len, False);
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/*
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* The length of the new password is in the last 4 bytes of
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* the data buffer.
|
|
*/
|
|
SIVAL(buffer, 512, new_pw_len);
|
|
ZERO_STRUCT(new_pw);
|
|
return True;
|
|
}
|
|
|
|
|
|
/***********************************************************
|
|
decode a password buffer
|
|
*new_pw_len is the length in bytes of the possibly mulitbyte
|
|
returned password including termination.
|
|
************************************************************/
|
|
BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
|
|
int new_pwrd_size, uint32 *new_pw_len)
|
|
{
|
|
int byte_len=0;
|
|
|
|
/*
|
|
Warning !!! : This function is called from some rpc call.
|
|
The password IN the buffer is a UNICODE string.
|
|
The password IN new_pwrd is an ASCII string
|
|
If you reuse that code somewhere else check first.
|
|
*/
|
|
|
|
/* The length of the new password is in the last 4 bytes of the data buffer. */
|
|
|
|
byte_len = IVAL(in_buffer, 512);
|
|
|
|
#ifdef DEBUG_PASSWORD
|
|
dump_data(100, in_buffer, 516);
|
|
#endif
|
|
|
|
/* Password cannot be longer than 128 characters */
|
|
if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
|
|
DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
|
|
DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
|
|
return False;
|
|
}
|
|
|
|
/* decode into the return buffer. Buffer must be a pstring */
|
|
*new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, byte_len, STR_UNICODE);
|
|
|
|
#ifdef DEBUG_PASSWORD
|
|
DEBUG(100,("decode_pw_buffer: new_pwrd: "));
|
|
dump_data(100, (char *)new_pwrd, *new_pw_len);
|
|
DEBUG(100,("multibyte len:%d\n", *new_pw_len));
|
|
DEBUG(100,("original char len:%d\n", byte_len/2));
|
|
#endif
|
|
|
|
return True;
|
|
}
|
|
|