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Diffstat (limited to 'source4/libcli/util/smbencrypt.c')
| -rw-r--r-- | source4/libcli/util/smbencrypt.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/source4/libcli/util/smbencrypt.c b/source4/libcli/util/smbencrypt.c new file mode 100644 index 0000000000..00c2b58146 --- /dev/null +++ b/source4/libcli/util/smbencrypt.c @@ -0,0 +1,418 @@ +/* + Unix SMB/CIFS implementation. + SMB parameters and setup + Copyright (C) Andrew Tridgell 1992-1998 + Modified by Jeremy Allison 1995. + Copyright (C) Jeremy Allison 1995-2000. + Copyright (C) Luke Kennethc Casson Leighton 1996-2000. + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003 + + 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; either version 2 of the License, or + (at your option) any later version. + + 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. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "byteorder.h" + +/* + This implements the X/Open SMB password encryption + It takes a password ('unix' string), a 8 byte "crypt key" + and puts 24 bytes of encrypted password into p24 */ +void SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24]) +{ + uchar p21[21]; + + memset(p21,'\0',21); + E_deshash(passwd, p21); + + SMBOWFencrypt(p21, c8, p24); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("SMBencrypt: lm#, challenge, response\n")); + dump_data(100, (char *)p21, 16); + dump_data(100, (const char *)c8, 8); + dump_data(100, (char *)p24, 24); +#endif +} + +/** + * Creates the MD4 Hash of the users password in NT UNICODE. + * @param passwd password in 'unix' charset. + * @param p16 return password hashed with md4, caller allocated 16 byte buffer + */ + +void E_md4hash(const char *passwd, uchar p16[16]) +{ + int len; + smb_ucs2_t wpwd[129]; + + /* Password must be converted to NT unicode - null terminated. */ + push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE); + /* Calculate length in bytes */ + len = strlen_w(wpwd) * sizeof(int16); + + mdfour(p16, (unsigned char *)wpwd, len); + ZERO_STRUCT(wpwd); +} + +/** + * Creates the DES forward-only Hash of the users password in DOS ASCII charset + * @param passwd password in 'unix' charset. + * @param p16 return password hashed with DES, caller allocated 16 byte buffer + */ + +void E_deshash(const char *passwd, uchar p16[16]) +{ + fstring dospwd; + ZERO_STRUCT(dospwd); + ZERO_STRUCTP(p16); + + /* Password must be converted to DOS charset - null terminated, uppercase. */ + push_ascii(dospwd, (const char *)passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE); + + /* Only the fisrt 14 chars are considered, password need not be null terminated. */ + E_P16(dospwd, p16); + + ZERO_STRUCT(dospwd); +} + +/** + * Creates the MD4 and DES (LM) Hash of the users password. + * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password. + * @param passwd password in 'unix' charset. + * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer + * @param p16 return password hashed with des, caller allocated 16 byte buffer + */ + +/* Does both the NT and LM owfs of a user's password */ +void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16]) +{ + /* Calculate the MD4 hash (NT compatible) of the password */ + memset(nt_p16, '\0', 16); + E_md4hash(pwd, nt_p16); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n")); + dump_data(120, pwd, strlen(pwd)); + dump_data(100, (char *)nt_p16, 16); +#endif + + E_deshash(pwd, (uchar *)p16); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n")); + dump_data(120, pwd, strlen(pwd)); + dump_data(100, (char *)p16, 16); +#endif +} + +/* Does both the NTLMv2 owfs of a user's password */ +BOOL ntv2_owf_gen(const uchar owf[16], + const char *user_in, const char *domain_in, uchar kr_buf[16]) +{ + smb_ucs2_t *user; + smb_ucs2_t *domain; + + size_t user_byte_len; + size_t domain_byte_len; + + HMACMD5Context ctx; + + user_byte_len = push_ucs2_allocate(&user, user_in); + if (user_byte_len == (size_t)-1) { + DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n")); + return False; + } + + domain_byte_len = push_ucs2_allocate(&domain, domain_in); + if (domain_byte_len == (size_t)-1) { + DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n")); + return False; + } + + strupper_w(user); + strupper_w(domain); + + SMB_ASSERT(user_byte_len >= 2); + SMB_ASSERT(domain_byte_len >= 2); + + /* We don't want null termination */ + user_byte_len = user_byte_len - 2; + domain_byte_len = domain_byte_len - 2; + + hmac_md5_init_limK_to_64(owf, 16, &ctx); + hmac_md5_update((const unsigned char *)user, user_byte_len, &ctx); + hmac_md5_update((const unsigned char *)domain, domain_byte_len, &ctx); + hmac_md5_final(kr_buf, &ctx); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n")); + dump_data(100, (const char *)user, user_byte_len); + dump_data(100, (const char *)domain, domain_byte_len); + dump_data(100, owf, 16); + dump_data(100, kr_buf, 16); +#endif + + SAFE_FREE(user); + SAFE_FREE(domain); + return True; +} + +/* Does the des encryption from the NT or LM MD4 hash. */ +void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24]) +{ + uchar p21[21]; + + ZERO_STRUCT(p21); + + memcpy(p21, passwd, 16); + E_P24(p21, c8, p24); +} + +/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */ +void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24]) +{ + uchar p21[21]; + + memset(p21,'\0',21); + memcpy(p21, passwd, 8); + memset(p21 + 8, 0xbd, 8); + + E_P24(p21, ntlmchalresp, p24); +#ifdef DEBUG_PASSWORD + DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n")); + dump_data(100, (char *)p21, 21); + dump_data(100, (const char *)ntlmchalresp, 8); + dump_data(100, (char *)p24, 24); +#endif +} + + +/* Does the NT MD4 hash then des encryption. */ + +void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24) +{ + uchar p21[21]; + + memset(p21,'\0',21); + + E_md4hash(passwd, p21); + SMBOWFencrypt(p21, c8, p24); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n")); + dump_data(100, (char *)p21, 16); + dump_data(100, (char *)c8, 8); + dump_data(100, (char *)p24, 24); +#endif +} + +BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode) +{ + int new_pw_len = strlen(passwd) * (unicode ? 2 : 1); + + if (new_pw_len > 512) + { + DEBUG(0,("make_oem_passwd_hash: new password is too long.\n")); + return False; + } + + /* + * Now setup the data area. + * We need to generate a random fill + * for this area to make it harder to + * decrypt. JRA. + */ + generate_random_buffer((unsigned char *)data, 516, False); + push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len, + STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII)); + SIVAL(data, 512, new_pw_len); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("make_oem_passwd_hash\n")); + dump_data(100, data, 516); +#endif + SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516); + + return True; +} + +/* Does the md5 encryption from the NT hash for NTLMv2. */ +void SMBOWFencrypt_ntv2(const uchar kr[16], + const DATA_BLOB srv_chal, + const DATA_BLOB cli_chal, + uchar resp_buf[16]) +{ + HMACMD5Context ctx; + + hmac_md5_init_limK_to_64(kr, 16, &ctx); + hmac_md5_update(srv_chal.data, srv_chal.length, &ctx); + hmac_md5_update(cli_chal.data, cli_chal.length, &ctx); + hmac_md5_final(resp_buf, &ctx); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n")); + dump_data(100, srv_chal.data, srv_chal.length); + dump_data(100, cli_chal.data, cli_chal.length); + dump_data(100, resp_buf, 16); +#endif +} + +void SMBsesskeygen_ntv2(const uchar kr[16], + const uchar * nt_resp, uint8 sess_key[16]) +{ + HMACMD5Context ctx; + + hmac_md5_init_limK_to_64(kr, 16, &ctx); + hmac_md5_update(nt_resp, 16, &ctx); + hmac_md5_final((unsigned char *)sess_key, &ctx); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBsesskeygen_ntv2:\n")); + dump_data(100, sess_key, 16); +#endif +} + +void SMBsesskeygen_ntv1(const uchar kr[16], + const uchar * nt_resp, uint8 sess_key[16]) +{ + mdfour((unsigned char *)sess_key, kr, 16); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBsesskeygen_ntv1:\n")); + dump_data(100, sess_key, 16); +#endif +} + +DATA_BLOB NTLMv2_generate_response(uchar ntlm_v2_hash[16], + DATA_BLOB server_chal, size_t client_chal_length) +{ + uchar ntlmv2_response[16]; + DATA_BLOB ntlmv2_client_data; + DATA_BLOB final_response; + + /* NTLMv2 */ + + /* We also get to specify some random data */ + ntlmv2_client_data = data_blob(NULL, client_chal_length); + generate_random_buffer(ntlmv2_client_data.data, ntlmv2_client_data.length, False); + + /* Given that data, and the challenge from the server, generate a response */ + SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, ntlmv2_client_data, ntlmv2_response); + + /* put it into nt_response, for the code below to put into the packet */ + final_response = data_blob(NULL, ntlmv2_client_data.length + sizeof(ntlmv2_response)); + memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response)); + /* after the first 16 bytes is the random data we generated above, so the server can verify us with it */ + memcpy(final_response.data + sizeof(ntlmv2_response), ntlmv2_client_data.data, ntlmv2_client_data.length); + data_blob_free(&ntlmv2_client_data); + + return final_response; +} + +BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password, + const DATA_BLOB server_chal, + DATA_BLOB *lm_response, DATA_BLOB *nt_response, + DATA_BLOB *session_key) +{ + uchar nt_hash[16]; + uchar ntlm_v2_hash[16]; + E_md4hash(password, nt_hash); + + /* We don't use the NT# directly. Instead we use it mashed up with + the username and domain. + This prevents username swapping during the auth exchange + */ + if (!ntv2_owf_gen(nt_hash, user, domain, ntlm_v2_hash)) { + return False; + } + + *nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 64 /* pick a number, > 8 */); + + /* LMv2 */ + + *lm_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 8); + + *session_key = data_blob(NULL, 16); + + /* The NTLMv2 calculations also provide a session key, for signing etc later */ + /* use only the first 16 bytes of nt_response for session key */ + SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, session_key->data); + + return True; +} + +/*********************************************************** + encode a password buffer. The caller gets to figure out + what to put in it. +************************************************************/ +BOOL encode_pw_buffer(char buffer[516], char *new_pw, int new_pw_length) +{ + generate_random_buffer((unsigned char *)buffer, 516, True); + + memcpy(&buffer[512 - new_pw_length], new_pw, new_pw_length); + + /* + * The length of the new password is in the last 4 bytes of + * the data buffer. + */ + SIVAL(buffer, 512, new_pw_length); + + 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; +} |