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-rw-r--r--source3/lib/passcheck.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/source3/lib/passcheck.c b/source3/lib/passcheck.c
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+++ b/source3/lib/passcheck.c
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+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ Password and authentication handling
+ Copyright (C) Andrew Tridgell 1992-1998
+
+ 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;
+extern int Protocol;
+
+extern pstring scope;
+extern pstring global_myname;
+extern fstring global_myworkgroup;
+
+
+
+/****************************************************************************
+core of smb password checking routine.
+****************************************************************************/
+static BOOL smb_pwd_check_ntlmv1(char *password, unsigned char *part_passwd,
+ unsigned char *c8,
+ uchar sess_key[16])
+{
+ /* Finish the encryption of part_passwd. */
+ unsigned char p24[24];
+
+ if (part_passwd == NULL)
+ DEBUG(10,("No password set - allowing access\n"));
+ /* No password set - always true ! */
+ if (part_passwd == NULL)
+ return True;
+
+ SMBOWFencrypt(part_passwd, c8, p24);
+ if (sess_key != NULL)
+ {
+ SMBsesskeygen_ntv1(part_passwd, NULL, 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(char *password, size_t pwd_len,
+ unsigned char *part_passwd,
+ unsigned char const *c8,
+ const char *user, const char *domain,
+ char *sess_key)
+{
+ /* Finish the encryption of part_passwd. */
+ unsigned char kr[16];
+ unsigned char resp[16];
+
+ if (part_passwd == NULL)
+ {
+ DEBUG(10,("No password set - allowing access\n"));
+ }
+ /* No password set - always true ! */
+ if (part_passwd == NULL)
+ {
+ return True;
+ }
+
+ ntv2_owf_gen(part_passwd, user, domain, kr);
+ SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, resp);
+ if (sess_key != NULL)
+ {
+ SMBsesskeygen_ntv2(kr, resp, 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.
+****************************************************************************/
+BOOL smb_password_ok(struct smb_passwd *smb_pass, uchar challenge[8],
+ const char *user, const char *domain,
+ uchar *lm_pass, size_t lm_pwd_len,
+ uchar *nt_pass, size_t nt_pwd_len,
+ uchar sess_key[16])
+{
+ if (smb_pass == NULL)
+ {
+ return False;
+ }
+
+ DEBUG(4,("Checking SMB password for user %s\n",
+ smb_pass->unix_name));
+
+ if (smb_pass->acct_ctrl & ACB_DISABLED)
+ {
+ DEBUG(3,("account for user %s was disabled.\n",
+ smb_pass->unix_name));
+ return False;
+ }
+
+ if (challenge == NULL)
+ {
+ DEBUG(1,("no challenge available - password failed\n"));
+ return False;
+ }
+
+ if ((Protocol >= PROTOCOL_NT1) && (smb_pass->smb_nt_passwd != NULL))
+ {
+ /* We have the NT MD4 hash challenge available - see if we can
+ use it (ie. does it exist in the smbpasswd file).
+ */
+ if (lp_server_ntlmv2() != False && nt_pwd_len > 24)
+ {
+ DEBUG(4,("smb_password_ok: Check NTLMv2 password\n"));
+ if (smb_pwd_check_ntlmv2(nt_pass, nt_pwd_len,
+ (uchar *)smb_pass->smb_nt_passwd,
+ challenge, user, domain,
+ sess_key))
+ {
+ return True;
+ }
+ }
+ if (lp_server_ntlmv2() != True && nt_pwd_len == 24)
+ {
+ DEBUG(4,("smb_password_ok: Check NT MD4 password\n"));
+ if (smb_pwd_check_ntlmv1((char *)nt_pass,
+ (uchar *)smb_pass->smb_nt_passwd,
+ challenge,
+ sess_key))
+ {
+ DEBUG(4,("NT MD4 password check succeeded\n"));
+ return True;
+ }
+ }
+ DEBUG(4,("NT MD4 password check failed\n"));
+ }
+
+ if (lp_server_ntlmv2() == True)
+ {
+ DEBUG(4,("Not checking LM MD4 password\n"));
+ return False;
+ }
+
+ /* Try against the lanman password. smb_pass->smb_passwd == NULL means
+ no password, allow access. */
+
+ DEBUG(4,("Checking LM MD4 password\n"));
+
+ if ((smb_pass->smb_passwd == NULL) &&
+ (smb_pass->acct_ctrl & ACB_PWNOTREQ))
+ {
+ DEBUG(4,("no password required for user %s\n",
+ smb_pass->unix_name));
+ return True;
+ }
+
+ if ((smb_pass->smb_passwd != NULL) &&
+ smb_pwd_check_ntlmv1((char *)lm_pass,
+ (uchar *)smb_pass->smb_passwd,
+ challenge, NULL))
+ {
+ DEBUG(4,("LM MD4 password check succeeded\n"));
+ return(True);
+ }
+
+ DEBUG(4,("LM MD4 password check failed\n"));
+
+ return False;
+}
+
+
+/****************************************************************************
+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
+****************************************************************************/
+BOOL pass_check_smb(struct smb_passwd *smb_pass, char *domain, uchar *chal,
+ uchar *lm_pwd, size_t lm_pwd_len,
+ uchar *nt_pwd, size_t nt_pwd_len,
+ struct passwd *pwd, uchar user_sess_key[16])
+{
+ const struct passwd *pass;
+ struct passwd pw;
+ char *user = NULL;
+
+ if (smb_pass == NULL)
+ {
+ DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user));
+ return False;
+ }
+
+ user = smb_pass->unix_name;
+
+ if (lm_pwd == NULL || nt_pwd == NULL)
+ {
+ return False;
+ }
+
+ if (pwd != NULL && user == NULL)
+ {
+ pass = (struct passwd *) pwd;
+ user = pass->pw_name;
+ }
+ else
+ {
+ pass = Get_Pwnam(user,True);
+ if (pass == NULL)
+ {
+ DEBUG(3,("Couldn't find user %s\n",user));
+ return False;
+ }
+ memcpy(&pw, pass, sizeof(struct passwd));
+ pass = &pw;
+ }
+
+ /* Quit if the account was disabled. */
+ if (smb_pass->acct_ctrl & ACB_DISABLED) {
+ DEBUG(3,("account for user %s was disabled.\n", user));
+ return False;
+ }
+
+ /* Ensure the uid's match */
+ if (smb_pass->unix_uid != pass->pw_uid)
+ {
+ DEBUG(3,("Error : UNIX (%d) and SMB (%d) uids in password files do not match !\n", pass->pw_uid, smb_pass->unix_uid));
+ return False;
+ }
+
+ if (lm_pwd[0] == '\0' && IS_BITS_SET_ALL(smb_pass->acct_ctrl, ACB_PWNOTREQ) && lp_null_passwords())
+ {
+ DEBUG(3,("account for user %s has no password and null passwords are allowed.\n", smb_pass->unix_name));
+ return(True);
+ }
+
+ if (smb_password_ok(smb_pass, chal, user, domain,
+ lm_pwd, lm_pwd_len,
+ nt_pwd, nt_pwd_len,
+ user_sess_key))
+ {
+ if (user_sess_key != NULL)
+ {
+#ifdef DEBUG_PASSWORD
+ DEBUG(100,("user session key: "));
+ dump_data(100, user_sess_key, 16);
+#endif
+ }
+ return(True);
+ }
+
+ DEBUG(3,("Error pass_check_smb failed\n"));
+ return False;
+}
+
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