From 927a8b330435b4c959ad851e32b83d97a6e3001b Mon Sep 17 00:00:00 2001 From: Andrew Bartlett Date: Mon, 16 Mar 2009 13:26:38 +1100 Subject: Move libcli/auth to the top level --- libcli/auth/smbencrypt.c | 595 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 595 insertions(+) create mode 100644 libcli/auth/smbencrypt.c (limited to 'libcli/auth/smbencrypt.c') diff --git a/libcli/auth/smbencrypt.c b/libcli/auth/smbencrypt.c new file mode 100644 index 0000000000..c6118c6568 --- /dev/null +++ b/libcli/auth/smbencrypt.c @@ -0,0 +1,595 @@ +/* + 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 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 . +*/ + +#include "includes.h" +#include "system/time.h" +#include "auth/ntlmssp/ntlmssp.h" +#include "auth/ntlmssp/msrpc_parse.h" +#include "../lib/crypto/crypto.h" +#include "libcli/auth/libcli_auth.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 + + Returns false if password must have been truncated to create LM hash +*/ +bool SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24]) +{ + bool ret; + uint8_t p21[21]; + + memset(p21,'\0',21); + ret = E_deshash(passwd, p21); + + SMBOWFencrypt(p21, c8, p24); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("SMBencrypt: lm#, challenge, response\n")); + dump_data(100, p21, 16); + dump_data(100, c8, 8); + dump_data(100, p24, 24); +#endif + + 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 + */ + +bool E_md4hash(const char *passwd, uint8_t p16[16]) +{ + size_t len; + smb_ucs2_t *wpwd; + bool ret; + + ret = push_ucs2_talloc(NULL, &wpwd, passwd, &len); + if (!ret || len < 2) { + /* We don't want to return fixed data, as most callers + * don't check */ + mdfour(p16, (const uint8_t *)passwd, strlen(passwd)); + return false; + } + + len -= 2; + mdfour(p16, (const uint8_t *)wpwd, len); + + talloc_free(wpwd); + return true; +} + +/** + * 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, uint8_t p16[16]) +{ + bool ret = true; + char dospwd[256]; + ZERO_STRUCT(dospwd); + + /* Password must be converted to DOS charset - null terminated, uppercase. */ + push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE); + + /* Only the first 14 chars are considered, password need not be null terminated. */ + E_P16((const uint8_t *)dospwd, p16); + + if (strlen(dospwd) > 14) { + ret = false; + } + + ZERO_STRUCT(dospwd); + + return ret; +} + +/* Does both the NTLMv2 owfs of a user's password */ +bool ntv2_owf_gen(const uint8_t owf[16], + const char *user_in, const char *domain_in, + bool upper_case_domain, /* Transform the domain into UPPER case */ + uint8_t kr_buf[16]) +{ + smb_ucs2_t *user; + smb_ucs2_t *domain; + size_t user_byte_len; + size_t domain_byte_len; + bool ret; + + HMACMD5Context ctx; + TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in); + + if (!mem_ctx) { + return false; + } + + if (!user_in) { + user_in = ""; + } + + if (!domain_in) { + domain_in = ""; + } + + user_in = strupper_talloc(mem_ctx, user_in); + if (user_in == NULL) { + talloc_free(mem_ctx); + return false; + } + + if (upper_case_domain) { + domain_in = strupper_talloc(mem_ctx, domain_in); + if (domain_in == NULL) { + talloc_free(mem_ctx); + return false; + } + } + + ret = push_ucs2_talloc(mem_ctx, &user, user_in, &user_byte_len ); + if (!ret) { + DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n")); + talloc_free(mem_ctx); + return false; + } + + ret = push_ucs2_talloc(mem_ctx, &domain, domain_in, &domain_byte_len); + if (!ret) { + DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n")); + talloc_free(mem_ctx); + return false; + } + + 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 void *)user, user_byte_len, &ctx); + hmac_md5_update((const void *)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 void *)user, user_byte_len); + dump_data(100, (const void *)domain, domain_byte_len); + dump_data(100, owf, 16); + dump_data(100, kr_buf, 16); +#endif + + talloc_free(mem_ctx); + return true; +} + +/* Does the des encryption from the NT or LM MD4 hash. */ +void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24]) +{ + uint8_t p21[21]; + + ZERO_STRUCT(p21); + + memcpy(p21, passwd, 16); + E_P24(p21, c8, p24); +} + +/* Does the NT MD4 hash then des encryption. */ + +void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24) +{ + uint8_t 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, p21, 16); + dump_data(100, c8, 8); + dump_data(100, p24, 24); +#endif +} + +/* Does the md5 encryption from the Key Response for NTLMv2. */ +void SMBOWFencrypt_ntv2(const uint8_t kr[16], + const DATA_BLOB *srv_chal, + const DATA_BLOB *smbcli_chal, + uint8_t 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(smbcli_chal->data, smbcli_chal->length, &ctx); + hmac_md5_final(resp_buf, &ctx); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n")); + dump_data(100, srv_chal->data, srv_chal->length); + dump_data(100, smbcli_chal->data, smbcli_chal->length); + dump_data(100, resp_buf, 16); +#endif +} + +void SMBsesskeygen_ntv2(const uint8_t kr[16], + const uint8_t * nt_resp, uint8_t 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((uint8_t *)sess_key, &ctx); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBsesskeygen_ntv2:\n")); + dump_data(100, sess_key, 16); +#endif +} + +void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16]) +{ + /* yes, this session key does not change - yes, this + is a problem - but it is 128 bits */ + + mdfour((uint8_t *)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 uint8_t lm_hash[16], + const uint8_t lm_resp[24], /* only uses 8 */ + uint8_t sess_key[16]) +{ + /* Calculate the LM session key (effective length 40 bits, + but changes with each session) */ + uint8_t p24[24]; + uint8_t partial_lm_hash[14]; + + memcpy(partial_lm_hash, lm_hash, 8); + memset(partial_lm_hash + 8, 0xbd, 6); + + des_crypt56(p24, lm_resp, partial_lm_hash, 1); + des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1); + + memcpy(sess_key, p24, 16); + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n")); + dump_data(100, sess_key, 16); +#endif +} + +DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx, + const char *hostname, + const char *domain) +{ + DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0); + + msrpc_gen(mem_ctx, &names_blob, + "aaa", + NTLMSSP_NAME_TYPE_DOMAIN, domain, + NTLMSSP_NAME_TYPE_SERVER, hostname, + 0, ""); + return names_blob; +} + +static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob) +{ + uint8_t client_chal[8]; + DATA_BLOB response = data_blob(NULL, 0); + uint8_t long_date[8]; + NTTIME nttime; + + unix_to_nt_time(&nttime, time(NULL)); + + generate_random_buffer(client_chal, sizeof(client_chal)); + + push_nttime(long_date, 0, nttime); + + /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */ + + msrpc_gen(mem_ctx, &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(TALLOC_CTX *out_mem_ctx, + const uint8_t ntlm_v2_hash[16], + const DATA_BLOB *server_chal, + const DATA_BLOB *names_blob) +{ + uint8_t ntlmv2_response[16]; + DATA_BLOB ntlmv2_client_data; + DATA_BLOB final_response; + + TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0, + "NTLMv2_generate_response internal context"); + + if (!mem_ctx) { + return data_blob(NULL, 0); + } + + /* 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(mem_ctx, 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_talloc(out_mem_ctx, 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); + + talloc_free(mem_ctx); + + return final_response; +} + +static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx, + const uint8_t ntlm_v2_hash[16], + const DATA_BLOB *server_chal) +{ + uint8_t lmv2_response[16]; + DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8); + DATA_BLOB final_response = data_blob_talloc(mem_ctx, 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(TALLOC_CTX *mem_ctx, + const char *user, const char *domain, const uint8_t nt_hash[16], + const DATA_BLOB *server_chal, + const DATA_BLOB *names_blob, + DATA_BLOB *lm_response, DATA_BLOB *nt_response, + DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key) +{ + uint8_t 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, true, ntlm_v2_hash)) { + return false; + } + + if (nt_response) { + *nt_response = NTLMv2_generate_response(mem_ctx, + ntlm_v2_hash, server_chal, + names_blob); + if (user_session_key) { + *user_session_key = data_blob_talloc(mem_ctx, 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(mem_ctx, + ntlm_v2_hash, server_chal); + if (lm_session_key) { + *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16); + + /* The NTLMv2 calculations also provide a session key, for signing etc later */ + /* use only the first 16 bytes of lm_response for session key */ + SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data); + } + } + + return true; +} + +bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx, + 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 *lm_session_key, DATA_BLOB *user_session_key) +{ + uint8_t nt_hash[16]; + E_md4hash(password, nt_hash); + + return SMBNTLMv2encrypt_hash(mem_ctx, + user, domain, nt_hash, server_chal, names_blob, + lm_response, nt_response, lm_session_key, 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_t buffer[516], const char *password, int string_flags) +{ + uint8_t new_pw[512]; + size_t new_pw_len; + + /* the incoming buffer can be any alignment. */ + string_flags |= STR_NOALIGN; + + new_pw_len = push_string(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(uint8_t in_buffer[516], char *new_pwrd, + int new_pwrd_size, int string_flags) +{ + int byte_len=0; + ssize_t converted_pw_len; + + /* 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)) { + return false; + } + + /* decode into the return buffer. Buffer length supplied */ + converted_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, + byte_len, string_flags); + + if (converted_pw_len == -1) { + return false; + } + +#ifdef DEBUG_PASSWORD + DEBUG(100,("decode_pw_buffer: new_pwrd: ")); + dump_data(100, (const uint8_t *)new_pwrd, converted_pw_len); + DEBUG(100,("multibyte len:%d\n", (int)converted_pw_len)); + DEBUG(100,("original char len:%d\n", byte_len/2)); +#endif + + return true; +} + +/*********************************************************** + encode a password buffer with an already unicode password. The + rest of the buffer is filled with random data to make it harder to attack. +************************************************************/ +bool set_pw_in_buffer(uint8_t buffer[516], DATA_BLOB *password) +{ + if (password->length > 512) { + return false; + } + + memcpy(&buffer[512 - password->length], password->data, password->length); + + generate_random_buffer(buffer, 512 - password->length); + + /* + * The length of the new password is in the last 4 bytes of + * the data buffer. + */ + SIVAL(buffer, 512, password->length); + return true; +} + +/*********************************************************** + decode a password buffer + *new_pw_size is the length in bytes of the extracted unicode password +************************************************************/ +bool extract_pw_from_buffer(TALLOC_CTX *mem_ctx, + uint8_t in_buffer[516], DATA_BLOB *new_pass) +{ + int byte_len=0; + + /* 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)) { + return false; + } + + *new_pass = data_blob_talloc(mem_ctx, &in_buffer[512 - byte_len], byte_len); + + if (!new_pass->data) { + return false; + } + + return true; +} -- cgit