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Diffstat (limited to 'source3/libsmb/smbencrypt.c')
| -rw-r--r-- | source3/libsmb/smbencrypt.c | 898 |
1 files changed, 0 insertions, 898 deletions
diff --git a/source3/libsmb/smbencrypt.c b/source3/libsmb/smbencrypt.c deleted file mode 100644 index 27702b9f42..0000000000 --- a/source3/libsmb/smbencrypt.c +++ /dev/null @@ -1,898 +0,0 @@ -/* - 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 3 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, see <http://www.gnu.org/licenses/>. -*/ - -#include "includes.h" -#include "../lib/util/byteorder.h" - -void SMBencrypt_hash(const uchar lm_hash[16], const uchar *c8, uchar p24[24]) -{ - uchar p21[21]; - - memset(p21,'\0',21); - memcpy(p21, lm_hash, 16); - - SMBOWFencrypt(p21, c8, p24); - -#ifdef DEBUG_PASSWORD - DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n")); - dump_data(100, p21, 16); - dump_data(100, c8, 8); - dump_data(100, p24, 24); -#endif -} - -/* - 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 - - Returns False if password must have been truncated to create LM hash -*/ - -bool SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24]) -{ - bool ret; - uchar lm_hash[16]; - - ret = E_deshash(passwd, lm_hash); - SMBencrypt_hash(lm_hash, c8, p24); - return ret; -} - -/** - * 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 MD5 Hash of a combination of 16 byte salt and 16 byte NT hash. - * @param 16 byte salt. - * @param 16 byte NT hash. - * @param 16 byte return hashed with md5, caller allocated 16 byte buffer - */ - -void E_md5hash(const uchar salt[16], const uchar nthash[16], uchar hash_out[16]) -{ - struct MD5Context tctx; - uchar array[32]; - - memset(hash_out, '\0', 16); - memcpy(array, salt, 16); - memcpy(&array[16], nthash, 16); - MD5Init(&tctx); - MD5Update(&tctx, array, 32); - MD5Final(hash_out, &tctx); -} - -/** - * 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 - * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True - * @note p16 is filled in regardless - */ - -bool E_deshash(const char *passwd, uchar p16[16]) -{ - bool ret = True; - fstring dospwd; - ZERO_STRUCT(dospwd); - - /* Password must be converted to DOS charset - null terminated, uppercase. */ - push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE); - - /* Only the fisrt 14 chars are considered, password need not be null terminated. */ - E_P16((const unsigned char *)dospwd, p16); - - if (strlen(dospwd) > 14) { - ret = False; - } - - ZERO_STRUCT(dospwd); - - return ret; -} - -/** - * 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, (uint8 *)pwd, strlen(pwd)); - dump_data(100, nt_p16, 16); -#endif - - E_deshash(pwd, (uchar *)p16); - -#ifdef DEBUG_PASSWORD - DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n")); - dump_data(120, (uint8 *)pwd, strlen(pwd)); - dump_data(100, 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, - bool upper_case_domain, /* Transform the domain into UPPER case */ - uchar kr_buf[16]) -{ - smb_ucs2_t *user; - smb_ucs2_t *domain; - - size_t user_byte_len; - size_t domain_byte_len; - - HMACMD5Context ctx; - - if (!push_ucs2_talloc(NULL, &user, user_in, &user_byte_len)) { - DEBUG(0, ("push_uss2_talloc() for user failed: %s\n", - strerror(errno))); - return False; - } - - if (!push_ucs2_talloc(NULL, &domain, domain_in, &domain_byte_len)) { - DEBUG(0, ("push_uss2_talloc() for domain failed: %s\n", - strerror(errno))); - TALLOC_FREE(user); - return False; - } - - strupper_w(user); - - if (upper_case_domain) - 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, (uint8 *)user, user_byte_len); - dump_data(100, (uint8 *)domain, domain_byte_len); - dump_data(100, (uint8 *)owf, 16); - dump_data(100, (uint8 *)kr_buf, 16); -#endif - - TALLOC_FREE(user); - TALLOC_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, p21, 21); - dump_data(100, ntlmchalresp, 8); - dump_data(100, p24, 24); -#endif -} - - -/* Does the des encryption. */ - -void SMBNTencrypt_hash(const uchar nt_hash[16], uchar *c8, uchar *p24) -{ - uchar p21[21]; - - memset(p21,'\0',21); - memcpy(p21, nt_hash, 16); - SMBOWFencrypt(p21, c8, p24); - -#ifdef DEBUG_PASSWORD - DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n")); - dump_data(100, p21, 16); - dump_data(100, c8, 8); - dump_data(100, p24, 24); -#endif -} - -/* Does the NT MD4 hash then des encryption. Plaintext version of the above. */ - -void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24) -{ - uchar nt_hash[16]; - E_md4hash(passwd, nt_hash); - SMBNTencrypt_hash(nt_hash, c8, p24); -} - -/* Does the md5 encryption from the Key Response 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]) -{ - /* a very nice, 128 bit, variable session key */ - - 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]) -{ - /* yes, this session key does not change - yes, this - is a problem - but it is 128 bits */ - - mdfour((unsigned char *)sess_key, kr, 16); - -#ifdef DEBUG_PASSWORD - DEBUG(100, ("SMBsesskeygen_ntv1:\n")); - dump_data(100, sess_key, 16); -#endif -} - -void SMBsesskeygen_lm_sess_key(const uchar lm_hash[16], - const uchar lm_resp[24], /* only uses 8 */ - uint8 sess_key[16]) -{ - uchar p24[24]; - uchar partial_lm_hash[16]; - - memcpy(partial_lm_hash, lm_hash, 8); - memset(partial_lm_hash + 8, 0xbd, 8); - - SMBOWFencrypt(partial_lm_hash, lm_resp, p24); - - memcpy(sess_key, p24, 16); - -#ifdef DEBUG_PASSWORD - DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n")); - dump_data(100, sess_key, 16); -#endif -} - -DATA_BLOB NTLMv2_generate_names_blob(const char *hostname, - const char *domain) -{ - DATA_BLOB names_blob = data_blob_null; - - msrpc_gen(&names_blob, "aaa", - NTLMSSP_NAME_TYPE_DOMAIN, domain, - NTLMSSP_NAME_TYPE_SERVER, hostname, - 0, ""); - return names_blob; -} - -static DATA_BLOB NTLMv2_generate_client_data(const DATA_BLOB *names_blob) -{ - uchar client_chal[8]; - DATA_BLOB response = data_blob_null; - char long_date[8]; - - generate_random_buffer(client_chal, sizeof(client_chal)); - - put_long_date(long_date, time(NULL)); - - /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */ - - msrpc_gen(&response, "ddbbdb", - 0x00000101, /* Header */ - 0, /* 'Reserved' */ - long_date, 8, /* Timestamp */ - client_chal, 8, /* client challenge */ - 0, /* Unknown */ - names_blob->data, names_blob->length); /* End of name list */ - - return response; -} - -static DATA_BLOB NTLMv2_generate_response(const uchar ntlm_v2_hash[16], - const DATA_BLOB *server_chal, - const DATA_BLOB *names_blob) -{ - uchar ntlmv2_response[16]; - DATA_BLOB ntlmv2_client_data; - DATA_BLOB final_response; - - /* NTLMv2 */ - /* generate some data to pass into the response function - including - the hostname and domain name of the server */ - ntlmv2_client_data = NTLMv2_generate_client_data(names_blob); - - /* Given that data, and the challenge from the server, generate a response */ - SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response); - - final_response = data_blob(NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length); - - memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response)); - - memcpy(final_response.data+sizeof(ntlmv2_response), - ntlmv2_client_data.data, ntlmv2_client_data.length); - - data_blob_free(&ntlmv2_client_data); - - return final_response; -} - -static DATA_BLOB LMv2_generate_response(const uchar ntlm_v2_hash[16], - const DATA_BLOB *server_chal) -{ - uchar lmv2_response[16]; - DATA_BLOB lmv2_client_data = data_blob(NULL, 8); - DATA_BLOB final_response = data_blob(NULL, 24); - - /* LMv2 */ - /* client-supplied random data */ - generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length); - - /* Given that data, and the challenge from the server, generate a response */ - SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response); - memcpy(final_response.data, lmv2_response, sizeof(lmv2_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(lmv2_response), - lmv2_client_data.data, lmv2_client_data.length); - - data_blob_free(&lmv2_client_data); - - return final_response; -} - -bool SMBNTLMv2encrypt_hash(const char *user, const char *domain, const uchar nt_hash[16], - const DATA_BLOB *server_chal, - const DATA_BLOB *names_blob, - DATA_BLOB *lm_response, DATA_BLOB *nt_response, - DATA_BLOB *user_session_key) -{ - uchar ntlm_v2_hash[16]; - - /* 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, False, ntlm_v2_hash)) { - return False; - } - - if (nt_response) { - *nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, - names_blob); - if (user_session_key) { - *user_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, user_session_key->data); - } - } - - /* LMv2 */ - - if (lm_response) { - *lm_response = LMv2_generate_response(ntlm_v2_hash, server_chal); - } - - return True; -} - -/* Plaintext version of the above. */ - -bool SMBNTLMv2encrypt(const char *user, const char *domain, const char *password, - const DATA_BLOB *server_chal, - const DATA_BLOB *names_blob, - DATA_BLOB *lm_response, DATA_BLOB *nt_response, - DATA_BLOB *user_session_key) -{ - uchar nt_hash[16]; - E_md4hash(password, nt_hash); - - return SMBNTLMv2encrypt_hash(user, domain, nt_hash, - server_chal, - names_blob, - lm_response, nt_response, - user_session_key); -} - -/*********************************************************** - encode a password buffer with a unicode password. The buffer - is filled with random data to make it harder to attack. -************************************************************/ -bool encode_pw_buffer(uint8 buffer[516], const char *password, int string_flags) -{ - uchar new_pw[512]; - size_t new_pw_len; - - /* the incoming buffer can be any alignment. */ - string_flags |= STR_NOALIGN; - - new_pw_len = push_string_check(new_pw, - password, - sizeof(new_pw), string_flags); - - memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len); - - generate_random_buffer(buffer, 512 - new_pw_len); - - /* - * The length of the new password is in the last 4 bytes of - * 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(TALLOC_CTX *ctx, - uint8 in_buffer[516], - char **pp_new_pwrd, - uint32 *new_pw_len, - int string_flags) -{ - int byte_len=0; - - *pp_new_pwrd = NULL; - *new_pw_len = 0; - - /* the incoming buffer can be any alignment. */ - string_flags |= STR_NOALIGN; - - /* - Warning !!! : This function is called from some rpc call. - The password IN the buffer may be 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 the size of the password buffer */ - if ( (byte_len < 0) || (byte_len > 512)) { - 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. */ - *new_pw_len = pull_string_talloc(ctx, - NULL, - 0, - pp_new_pwrd, - &in_buffer[512 - byte_len], - byte_len, - string_flags); - - if (!*pp_new_pwrd || *new_pw_len == 0) { - DEBUG(0, ("decode_pw_buffer: pull_string_talloc failed\n")); - return false; - } - -#ifdef DEBUG_PASSWORD - DEBUG(100,("decode_pw_buffer: new_pwrd: ")); - dump_data(100, (uint8 *)*pp_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; -} - -/*********************************************************** - Decode an arc4 encrypted password change buffer. -************************************************************/ - -void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf[532], const DATA_BLOB *psession_key) -{ - struct MD5Context tctx; - unsigned char key_out[16]; - - /* Confounder is last 16 bytes. */ - - MD5Init(&tctx); - MD5Update(&tctx, &pw_buf[516], 16); - MD5Update(&tctx, psession_key->data, psession_key->length); - MD5Final(key_out, &tctx); - /* arc4 with key_out. */ - SamOEMhash(pw_buf, key_out, 516); -} - -/*********************************************************** - Encrypt/Decrypt used for LSA secrets and trusted domain - passwords. -************************************************************/ - -void sess_crypt_blob(DATA_BLOB *out, const DATA_BLOB *in, const DATA_BLOB *session_key, int forward) -{ - int i, k; - - for (i=0,k=0; - i<in->length; - i += 8, k += 7) { - uint8 bin[8], bout[8], key[7]; - - memset(bin, 0, 8); - memcpy(bin, &in->data[i], MIN(8, in->length-i)); - - if (k + 7 > session_key->length) { - k = (session_key->length - k); - } - memcpy(key, &session_key->data[k], 7); - - des_crypt56(bout, bin, key, forward?1:0); - - memcpy(&out->data[i], bout, MIN(8, in->length-i)); - } -} - -/* Decrypts password-blob with session-key - * @param nt_hash NT hash for the session key - * @param data_in DATA_BLOB encrypted password - * - * Returns cleartext password in CH_UNIX - * Caller must free the returned string - */ - -char *decrypt_trustdom_secret(uint8_t nt_hash[16], DATA_BLOB *data_in) -{ - DATA_BLOB data_out, sess_key; - uint32_t length; - uint32_t version; - fstring cleartextpwd; - - if (!data_in || !nt_hash) - return NULL; - - /* hashed twice with md4 */ - mdfour(nt_hash, nt_hash, 16); - - /* 16-Byte session-key */ - sess_key = data_blob(nt_hash, 16); - if (sess_key.data == NULL) - return NULL; - - data_out = data_blob(NULL, data_in->length); - if (data_out.data == NULL) - return NULL; - - /* decrypt with des3 */ - sess_crypt_blob(&data_out, data_in, &sess_key, 0); - - /* 4 Byte length, 4 Byte version */ - length = IVAL(data_out.data, 0); - version = IVAL(data_out.data, 4); - - if (length > data_in->length - 8) { - DEBUG(0,("decrypt_trustdom_secret: invalid length (%d)\n", length)); - return NULL; - } - - if (version != 1) { - DEBUG(0,("decrypt_trustdom_secret: unknown version number (%d)\n", version)); - return NULL; - } - - rpcstr_pull(cleartextpwd, data_out.data + 8, sizeof(fstring), length, 0 ); - -#ifdef DEBUG_PASSWORD - DEBUG(100,("decrypt_trustdom_secret: length is: %d, version is: %d, password is: %s\n", - length, version, cleartextpwd)); -#endif - - data_blob_free(&data_out); - data_blob_free(&sess_key); - - return SMB_STRDUP(cleartextpwd); - -} - -/* encode a wkssvc_PasswordBuffer: - * - * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of - * 16byte), confounder in front of the 516 byte buffer (instead of after that - * buffer), calling MD5Update() first with session_key and then with confounder - * (vice versa in samr) - Guenther */ - -void encode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx, - const char *pwd, - DATA_BLOB *session_key, - struct wkssvc_PasswordBuffer **pwd_buf) -{ - uint8_t buffer[516]; - struct MD5Context ctx; - struct wkssvc_PasswordBuffer *my_pwd_buf = NULL; - DATA_BLOB confounded_session_key; - int confounder_len = 8; - uint8_t confounder[8]; - - my_pwd_buf = talloc_zero(mem_ctx, struct wkssvc_PasswordBuffer); - if (!my_pwd_buf) { - return; - } - - confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16); - - encode_pw_buffer(buffer, pwd, STR_UNICODE); - - generate_random_buffer((uint8_t *)confounder, confounder_len); - - MD5Init(&ctx); - MD5Update(&ctx, session_key->data, session_key->length); - MD5Update(&ctx, confounder, confounder_len); - MD5Final(confounded_session_key.data, &ctx); - - SamOEMhashBlob(buffer, 516, &confounded_session_key); - - memcpy(&my_pwd_buf->data[0], confounder, confounder_len); - memcpy(&my_pwd_buf->data[8], buffer, 516); - - data_blob_free(&confounded_session_key); - - *pwd_buf = my_pwd_buf; -} - -WERROR decode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx, - struct wkssvc_PasswordBuffer *pwd_buf, - DATA_BLOB *session_key, - char **pwd) -{ - uint8_t buffer[516]; - struct MD5Context ctx; - uint32_t pwd_len; - - DATA_BLOB confounded_session_key; - - int confounder_len = 8; - uint8_t confounder[8]; - - *pwd = NULL; - - if (!pwd_buf) { - return WERR_BAD_PASSWORD; - } - - if (session_key->length != 16) { - DEBUG(10,("invalid session key\n")); - return WERR_BAD_PASSWORD; - } - - confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16); - - memcpy(&confounder, &pwd_buf->data[0], confounder_len); - memcpy(&buffer, &pwd_buf->data[8], 516); - - MD5Init(&ctx); - MD5Update(&ctx, session_key->data, session_key->length); - MD5Update(&ctx, confounder, confounder_len); - MD5Final(confounded_session_key.data, &ctx); - - SamOEMhashBlob(buffer, 516, &confounded_session_key); - - if (!decode_pw_buffer(mem_ctx, buffer, pwd, &pwd_len, STR_UNICODE)) { - data_blob_free(&confounded_session_key); - return WERR_BAD_PASSWORD; - } - - data_blob_free(&confounded_session_key); - - return WERR_OK; -} - -DATA_BLOB decrypt_drsuapi_blob(TALLOC_CTX *mem_ctx, - const DATA_BLOB *session_key, - bool rcrypt, - uint32_t rid, - const DATA_BLOB *buffer) -{ - DATA_BLOB confounder; - DATA_BLOB enc_buffer; - - struct MD5Context md5; - uint8_t _enc_key[16]; - DATA_BLOB enc_key; - - DATA_BLOB dec_buffer; - - uint32_t crc32_given; - uint32_t crc32_calc; - DATA_BLOB checked_buffer; - - DATA_BLOB plain_buffer; - - /* - * the combination "c[3] s[1] e[1] d[0]..." - * was successful!!!!!!!!!!!!!!!!!!!!!!!!!! - */ - - /* - * the first 16 bytes at the beginning are the confounder - * followed by the 4 byte crc32 checksum - */ - if (buffer->length < 20) { - return data_blob_const(NULL, 0); - } - confounder = data_blob_const(buffer->data, 16); - enc_buffer = data_blob_const(buffer->data + 16, buffer->length - 16); - - /* - * build the encryption key md5 over the session key followed - * by the confounder - * - * here the gensec session key is used and - * not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key! - */ - enc_key = data_blob_const(_enc_key, sizeof(_enc_key)); - MD5Init(&md5); - MD5Update(&md5, session_key->data, session_key->length); - MD5Update(&md5, confounder.data, confounder.length); - MD5Final(enc_key.data, &md5); - - /* - * copy the encrypted buffer part and - * decrypt it using the created encryption key using arcfour - */ - dec_buffer = data_blob_talloc(mem_ctx, enc_buffer.data, enc_buffer.length); - if (!dec_buffer.data) { - return data_blob_const(NULL, 0); - } - SamOEMhashBlob(dec_buffer.data, dec_buffer.length, &enc_key); - - /* - * the first 4 byte are the crc32 checksum - * of the remaining bytes - */ - crc32_given = IVAL(dec_buffer.data, 0); - crc32_calc = crc32_calc_buffer(dec_buffer.data + 4 , dec_buffer.length - 4); - if (crc32_given != crc32_calc) { - DEBUG(1,("CRC32: given[0x%08X] calc[0x%08X]\n", - crc32_given, crc32_calc)); - return data_blob_const(NULL, 0); - } - checked_buffer = data_blob_talloc(mem_ctx, dec_buffer.data + 4, dec_buffer.length - 4); - if (!checked_buffer.data) { - return data_blob_const(NULL, 0); - } - - /* - * some attributes seem to be in a usable form after this decryption - * (supplementalCredentials, priorValue, currentValue, trustAuthOutgoing, - * trustAuthIncoming, initialAuthOutgoing, initialAuthIncoming) - * At least supplementalCredentials contains plaintext - * like "Primary:Kerberos" (in unicode form) - * - * some attributes seem to have some additional encryption - * dBCSPwd, unicodePwd, ntPwdHistory, lmPwdHistory - * - * it's the sam_rid_crypt() function, as the value is constant, - * so it doesn't depend on sessionkeys. - */ - if (rcrypt) { - uint32_t i, num_hashes; - - if ((checked_buffer.length % 16) != 0) { - return data_blob_const(NULL, 0); - } - - plain_buffer = data_blob_talloc(mem_ctx, checked_buffer.data, checked_buffer.length); - if (!plain_buffer.data) { - return data_blob_const(NULL, 0); - } - - num_hashes = plain_buffer.length / 16; - for (i = 0; i < num_hashes; i++) { - uint32_t offset = i * 16; - sam_pwd_hash(rid, checked_buffer.data + offset, plain_buffer.data + offset, 0); - } - } else { - plain_buffer = checked_buffer; - } - - return plain_buffer; -} - - |