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Diffstat (limited to 'source/auth/auth_sam.c')
-rw-r--r-- | source/auth/auth_sam.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/source/auth/auth_sam.c b/source/auth/auth_sam.c new file mode 100644 index 00000000000..ce0b03d942a --- /dev/null +++ b/source/auth/auth_sam.c @@ -0,0 +1,229 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + Password and authentication handling + Copyright (C) Andrew Tridgell 1992-2000 + Copyright (C) Luke Kenneth Casson Leighton 1996-2000 + Copyright (C) Andrew Bartlett 2001 + + 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" + +extern int DEBUGLEVEL; + +/**************************************************************************** +core of smb password checking routine. +****************************************************************************/ +static BOOL smb_pwd_check_ntlmv1(const uchar *password, + const uchar *part_passwd, + const uchar *c8, + uchar user_sess_key[16]) +{ + /* Finish the encryption of part_passwd. */ + uchar p24[24]; + + if (part_passwd == NULL) { + DEBUG(10,("No password set - DISALLOWING access\n")); + /* No password set - always false ! */ + return False; + } + + SMBOWFencrypt(part_passwd, c8, p24); + if (user_sess_key != NULL) + { + SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key); + } + + + +#if DEBUG_PASSWORD + DEBUG(100,("Part password (P16) was |")); + dump_data(100, part_passwd, 16); + DEBUG(100,("Password from client was |")); + dump_data(100, password, 24); + DEBUG(100,("Given challenge was |")); + dump_data(100, c8, 8); + DEBUG(100,("Value from encryption was |")); + dump_data(100, p24, 24); +#endif + return (memcmp(p24, password, 24) == 0); +} + +/**************************************************************************** +core of smb password checking routine. +****************************************************************************/ +static BOOL smb_pwd_check_ntlmv2(const uchar *password, size_t pwd_len, + uchar *part_passwd, + uchar const *c8, + const char *user, const char *domain, + char *user_sess_key) +{ + /* Finish the encryption of part_passwd. */ + uchar kr[16]; + uchar resp[16]; + + if (part_passwd == NULL) + { + DEBUG(10,("No password set - DISALLOWING access\n")); + /* No password set - always False */ + return False; + } + + ntv2_owf_gen(part_passwd, user, domain, kr); + SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, resp); + if (user_sess_key != NULL) + { + SMBsesskeygen_ntv2(kr, resp, user_sess_key); + } + +#if DEBUG_PASSWORD + DEBUG(100,("Part password (P16) was |")); + dump_data(100, part_passwd, 16); + DEBUG(100,("Password from client was |")); + dump_data(100, password, pwd_len); + DEBUG(100,("Given challenge was |")); + dump_data(100, c8, 8); + DEBUG(100,("Value from encryption was |")); + dump_data(100, resp, 16); +#endif + + return (memcmp(resp, password, 16) == 0); +} + + +/**************************************************************************** + Do a specific test for an smb password being correct, given a smb_password and + the lanman and NT responses. +****************************************************************************/ +uint32 smb_password_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info) +{ + uint8 *nt_pw, *lm_pw; + + /* Quit if the account was disabled. */ + if(pdb_get_acct_ctrl(sampass) & ACB_DISABLED) { + DEBUG(1,("Account for user '%s' was disabled.\n", user_info->smb_username.str)); + return(NT_STATUS_ACCOUNT_DISABLED); + } + + if (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) + { + if (lp_null_passwords()) + { + DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", user_info->smb_username.str)); + return(NT_STATUS_NOPROBLEMO); + } + else + { + DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", user_info->smb_username.str)); + return(NT_STATUS_LOGON_FAILURE); + } + } + + if (!user_info || !sampass) + return(NT_STATUS_LOGON_FAILURE); + + DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",user_info->smb_username.str)); + + nt_pw = pdb_get_nt_passwd(sampass); + + if (nt_pw != NULL) { + if ((user_info->nt_resp.len > 24 )) { + /* We have the NT MD4 hash challenge available - see if we can + use it (ie. does it exist in the smbpasswd file). + */ + DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n")); + if (smb_pwd_check_ntlmv2( user_info->nt_resp.buffer, + user_info->nt_resp.len, + nt_pw, + user_info->chal, user_info->requested_username.str, + user_info->requested_domain.str, + server_info->session_key)) + { + return NT_STATUS_NOPROBLEMO; + } + DEBUG(4,("smb_password_ok: NT MD4 password check failed\n")); + + } else if (lp_ntlm_auth() && (user_info->nt_resp.len == 24 )) { + /* We have the NT MD4 hash challenge available - see if we can + use it (ie. does it exist in the smbpasswd file). + */ + DEBUG(4,("smb_password_ok: Checking NT MD4 password\n")); + if (smb_pwd_check_ntlmv1(user_info->nt_resp.buffer, + nt_pw, user_info->chal, + server_info->session_key)) { + DEBUG(4,("smb_password_ok: NT MD4 password check succeeded\n")); + return NT_STATUS_NOPROBLEMO; + } else { + DEBUG(4,("smb_password_ok: NT MD4 password check failed\n")); + return NT_STATUS_WRONG_PASSWORD; + } + } + } + + lm_pw = pdb_get_lanman_passwd(sampass); + + if(lp_lanman_auth() && (lm_pw != NULL) && (user_info->lm_resp.len == 24 )) { + DEBUG(4,("smb_password_ok: Checking LM password\n")); + if (smb_pwd_check_ntlmv1(user_info->lm_resp.buffer, + lm_pw, user_info->chal, + server_info->session_key)) { + DEBUG(4,("smb_password_ok: LM password check succeeded\n")); + return NT_STATUS_NOPROBLEMO; + } else { + DEBUG(4,("smb_password_ok: LM password check failed\n")); + return NT_STATUS_WRONG_PASSWORD; + } + } + + return NT_STATUS_LOGON_FAILURE; +} + + +/**************************************************************************** +check if a username/password is OK assuming the password is a 24 byte +SMB hash +return True if the password is correct, False otherwise +****************************************************************************/ + +uint32 check_smbpasswd_security(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info) +{ + SAM_ACCOUNT *sampass=NULL; + BOOL ret; + uint32 nt_status; + + pdb_init_sam(&sampass); + + /* get the account information */ + ret = pdb_getsampwnam(sampass, user_info->smb_username.str); + if (ret == False) + { + DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->smb_username.str)); + pdb_free_sam(sampass); + return(NT_STATUS_NO_SUCH_USER); + } + + if ((nt_status = smb_password_ok(sampass, user_info, server_info)) != NT_STATUS_NOPROBLEMO) + { + pdb_free_sam(sampass); + return(nt_status); + } + + pdb_free_sam(sampass); + return nt_status; +} + + |