the first independent msrpc daemon - lsarpcd.

one horrible cut / paste job from smbd, plus a code split of shared
components between the two.

the job is not _yet_ complete, as i need to be able to do a become_user()
call for security reasons.  i picked lsarpcd first because you don't
_need_ security on it (microsoft botched so badly on this one, it's not
real.  at least they fixed this in nt5 with restrictanonymous=0x2).
fixing this involves sending the current smb and unix credentials down
the unix pipe so that the daemon it eventually goes to can pick them
up at the other end.

i can't believe this all worked!!!
(This used to be commit 2245b0c6d13c7c5886e81f9137b05df883598c26)

1 files changed, 289 insertions, 0 deletions

diff --git a/source3/lib/passcheck.c b/source3/lib/passcheck.c
new file mode 100644
index 0000000000..195a404ff3
--- /dev/null
+++ b/source3/lib/passcheck.c
@@ -0,0 +1,289 @@
+/* 
+   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;
+}
+