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Diffstat (limited to 'source4/libcli/auth/smbencrypt.c')
| -rw-r--r-- | source4/libcli/auth/smbencrypt.c | 595 |
1 files changed, 0 insertions, 595 deletions
diff --git a/source4/libcli/auth/smbencrypt.c b/source4/libcli/auth/smbencrypt.c deleted file mode 100644 index c6118c6568..0000000000 --- a/source4/libcli/auth/smbencrypt.c +++ /dev/null @@ -1,595 +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 "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; -} |