Move libcli/auth to the top level

1 files changed, 603 insertions, 0 deletions

diff --git a/libcli/auth/ntlm_check.c b/libcli/auth/ntlm_check.c
new file mode 100644
index 0000000000..0805b1b043
--- /dev/null
+++ b/libcli/auth/ntlm_check.c
@@ -0,0 +1,603 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Password and authentication handling
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
+   Copyright (C) Gerald Carter                             2003
+   Copyright (C) Luke Kenneth Casson Leighton         1996-2000
+   
+   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 "../lib/crypto/crypto.h"
+#include "librpc/gen_ndr/netlogon.h"
+#include "libcli/auth/libcli_auth.h"
+#include "auth/ntlm/ntlm_check.h"
+
+/****************************************************************************
+ Core of smb password checking routine.
+****************************************************************************/
+
+static bool smb_pwd_check_ntlmv1(TALLOC_CTX *mem_ctx,
+				 const DATA_BLOB *nt_response,
+				 const uint8_t *part_passwd,
+				 const DATA_BLOB *sec_blob,
+				 DATA_BLOB *user_sess_key)
+{
+	/* Finish the encryption of part_passwd. */
+	uint8_t p24[24];
+	
+	if (part_passwd == NULL) {
+		DEBUG(10,("No password set - DISALLOWING access\n"));
+		/* No password set - always false ! */
+		return false;
+	}
+	
+	if (sec_blob->length != 8) {
+		DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n", 
+			  (unsigned long)sec_blob->length));
+		return false;
+	}
+	
+	if (nt_response->length != 24) {
+		DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n", 
+			  (unsigned long)nt_response->length));
+		return false;
+	}
+
+	SMBOWFencrypt(part_passwd, sec_blob->data, p24);
+	
+#if DEBUG_PASSWORD
+	DEBUG(100,("Part password (P16) was |\n"));
+	dump_data(100, part_passwd, 16);
+	DEBUGADD(100,("Password from client was |\n"));
+	dump_data(100, nt_response->data, nt_response->length);
+	DEBUGADD(100,("Given challenge was |\n"));
+	dump_data(100, sec_blob->data, sec_blob->length);
+	DEBUGADD(100,("Value from encryption was |\n"));
+	dump_data(100, p24, 24);
+#endif
+	if (memcmp(p24, nt_response->data, 24) == 0) {
+		if (user_sess_key != NULL) {
+			*user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
+			SMBsesskeygen_ntv1(part_passwd, user_sess_key->data);
+		}
+		return true;
+	} 
+	return false;
+}
+
+/****************************************************************************
+ Core of smb password checking routine. (NTLMv2, LMv2)
+ Note:  The same code works with both NTLMv2 and LMv2.
+****************************************************************************/
+
+static bool smb_pwd_check_ntlmv2(TALLOC_CTX *mem_ctx,
+				 const DATA_BLOB *ntv2_response,
+				 const uint8_t *part_passwd,
+				 const DATA_BLOB *sec_blob,
+				 const char *user, const char *domain,
+				 bool upper_case_domain, /* should the domain be transformed into upper case? */
+				 DATA_BLOB *user_sess_key)
+{
+	/* Finish the encryption of part_passwd. */
+	uint8_t kr[16];
+	uint8_t value_from_encryption[16];
+	DATA_BLOB client_key_data;
+
+	if (part_passwd == NULL) {
+		DEBUG(10,("No password set - DISALLOWING access\n"));
+		/* No password set - always false */
+		return false;
+	}
+
+	if (sec_blob->length != 8) {
+		DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n", 
+			  (unsigned long)sec_blob->length));
+		return false;
+	}
+	
+	if (ntv2_response->length < 24) {
+		/* We MUST have more than 16 bytes, or the stuff below will go
+		   crazy.  No known implementation sends less than the 24 bytes
+		   for LMv2, let alone NTLMv2. */
+		DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n", 
+			  (unsigned long)ntv2_response->length));
+		return false;
+	}
+
+	client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
+	/* 
+	   todo:  should we be checking this for anything?  We can't for LMv2, 
+	   but for NTLMv2 it is meant to contain the current time etc.
+	*/
+
+	if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
+		return false;
+	}
+
+	SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
+
+#if DEBUG_PASSWORD
+	DEBUG(100,("Part password (P16) was |\n"));
+	dump_data(100, part_passwd, 16);
+	DEBUGADD(100,("Password from client was |\n"));
+	dump_data(100, ntv2_response->data, ntv2_response->length);
+	DEBUGADD(100,("Variable data from client was |\n"));
+	dump_data(100, client_key_data.data, client_key_data.length);
+	DEBUGADD(100,("Given challenge was |\n"));
+	dump_data(100, sec_blob->data, sec_blob->length);
+	DEBUGADD(100,("Value from encryption was |\n"));
+	dump_data(100, value_from_encryption, 16);
+#endif
+	data_blob_clear_free(&client_key_data);
+	if (memcmp(value_from_encryption, ntv2_response->data, 16) == 0) { 
+		if (user_sess_key != NULL) {
+			*user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
+			SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
+		}
+		return true;
+	}
+	return false;
+}
+
+/****************************************************************************
+ Core of smb password checking routine. (NTLMv2, LMv2)
+ Note:  The same code works with both NTLMv2 and LMv2.
+****************************************************************************/
+
+static bool smb_sess_key_ntlmv2(TALLOC_CTX *mem_ctx,
+				const DATA_BLOB *ntv2_response,
+				const uint8_t *part_passwd,
+				const DATA_BLOB *sec_blob,
+				const char *user, const char *domain,
+				bool upper_case_domain, /* should the domain be transformed into upper case? */
+				DATA_BLOB *user_sess_key)
+{
+	/* Finish the encryption of part_passwd. */
+	uint8_t kr[16];
+	uint8_t value_from_encryption[16];
+	DATA_BLOB client_key_data;
+
+	if (part_passwd == NULL) {
+		DEBUG(10,("No password set - DISALLOWING access\n"));
+		/* No password set - always false */
+		return false;
+	}
+
+	if (sec_blob->length != 8) {
+		DEBUG(0, ("smb_sess_key_ntlmv2: incorrect challenge size (%lu)\n", 
+			  (unsigned long)sec_blob->length));
+		return false;
+	}
+	
+	if (ntv2_response->length < 24) {
+		/* We MUST have more than 16 bytes, or the stuff below will go
+		   crazy.  No known implementation sends less than the 24 bytes
+		   for LMv2, let alone NTLMv2. */
+		DEBUG(0, ("smb_sess_key_ntlmv2: incorrect password length (%lu)\n", 
+			  (unsigned long)ntv2_response->length));
+		return false;
+	}
+
+	client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
+
+	if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
+		return false;
+	}
+
+	SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
+	*user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
+	SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
+	return true;
+}
+
+/**
+ * Compare password hashes against those from the SAM
+ *
+ * @param mem_ctx talloc context
+ * @param client_lanman LANMAN password hash, as supplied by the client
+ * @param client_nt NT (MD4) password hash, as supplied by the client
+ * @param username internal Samba username, for log messages
+ * @param client_username username the client used
+ * @param client_domain domain name the client used (may be mapped)
+ * @param stored_lanman LANMAN password hash, as stored on the SAM
+ * @param stored_nt NT (MD4) password hash, as stored on the SAM
+ * @param user_sess_key User session key
+ * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
+ */
+
+NTSTATUS hash_password_check(TALLOC_CTX *mem_ctx,
+				 bool lanman_auth,
+			     const struct samr_Password *client_lanman,
+			     const struct samr_Password *client_nt,
+			     const char *username, 
+			     const struct samr_Password *stored_lanman, 
+			     const struct samr_Password *stored_nt)
+{
+	if (stored_nt == NULL) {
+		DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n", 
+			 username));
+	}
+
+	if (client_nt && stored_nt) {
+		if (memcmp(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash)) == 0) {
+			return NT_STATUS_OK;
+		} else {
+			DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
+				 username));
+			return NT_STATUS_WRONG_PASSWORD;
+		}
+
+	} else if (client_lanman && stored_lanman) {
+		if (!lanman_auth) {
+			DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
+				 username));
+			return NT_STATUS_WRONG_PASSWORD;
+		}
+		if (strchr_m(username, '@')) {
+			return NT_STATUS_NOT_FOUND;
+		}
+
+		if (memcmp(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash)) == 0) {
+			return NT_STATUS_OK;
+		} else {
+			DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
+				 username));
+			return NT_STATUS_WRONG_PASSWORD;
+		}
+	}
+	if (strchr_m(username, '@')) {
+		return NT_STATUS_NOT_FOUND;
+	}
+	return NT_STATUS_WRONG_PASSWORD;
+}
+
+/**
+ * Check a challenge-response password against the value of the NT or
+ * LM password hash.
+ *
+ * @param mem_ctx talloc context
+ * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
+ * @param nt_response 'unicode' NT response to the challenge, or unicode password
+ * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
+ * @param username internal Samba username, for log messages
+ * @param client_username username the client used
+ * @param client_domain domain name the client used (may be mapped)
+ * @param stored_lanman LANMAN ASCII password from our passdb or similar
+ * @param stored_nt MD4 unicode password from our passdb or similar
+ * @param user_sess_key User session key
+ * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
+ */
+
+NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
+				 bool lanman_auth,
+				 bool ntlm_auth,
+			     uint32_t logon_parameters,
+			     const DATA_BLOB *challenge,
+			     const DATA_BLOB *lm_response,
+			     const DATA_BLOB *nt_response,
+			     const char *username, 
+			     const char *client_username, 
+			     const char *client_domain,
+			     const struct samr_Password *stored_lanman, 
+			     const struct samr_Password *stored_nt, 
+			     DATA_BLOB *user_sess_key, 
+			     DATA_BLOB *lm_sess_key)
+{
+	const static uint8_t zeros[8];
+	DATA_BLOB tmp_sess_key;
+
+	if (stored_nt == NULL) {
+		DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n", 
+			 username));
+	}
+
+	*lm_sess_key = data_blob(NULL, 0);
+	*user_sess_key = data_blob(NULL, 0);
+
+	/* Check for cleartext netlogon. Used by Exchange 5.5. */
+	if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
+	    && challenge->length == sizeof(zeros) 
+	    && (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
+		struct samr_Password client_nt;
+		struct samr_Password client_lm;
+		char *unix_pw = NULL;
+		bool lm_ok;
+
+		DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
+			 username));
+		mdfour(client_nt.hash, nt_response->data, nt_response->length);
+		
+		if (lm_response->length && 
+		    (convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX, 
+					  lm_response->data, lm_response->length, 
+					   (void **)&unix_pw, NULL, false))) {
+			if (E_deshash(unix_pw, client_lm.hash)) {
+				lm_ok = true;
+			} else {
+				lm_ok = false;
+			}
+		} else {
+			lm_ok = false;
+		}
+		return hash_password_check(mem_ctx, 
+					   lanman_auth,
+					   lm_ok ? &client_lm : NULL, 
+					   nt_response->length ? &client_nt : NULL, 
+					   username,  
+					   stored_lanman, stored_nt);
+	}
+
+	if (nt_response->length != 0 && nt_response->length < 24) {
+		DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n", 
+			 (unsigned long)nt_response->length, username));		
+	}
+	
+	if (nt_response->length > 24 && stored_nt) {
+		/* We have the NT MD4 hash challenge available - see if we can
+		   use it 
+		*/
+		DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
+		if (smb_pwd_check_ntlmv2(mem_ctx,
+					 nt_response, 
+					 stored_nt->hash, challenge, 
+					 client_username, 
+					 client_domain,
+					 false,
+					 user_sess_key)) {
+			*lm_sess_key = *user_sess_key;
+			if (user_sess_key->length) {
+				lm_sess_key->length = 8;
+			}
+			return NT_STATUS_OK;
+		}
+		
+		DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
+		if (smb_pwd_check_ntlmv2(mem_ctx,
+					 nt_response, 
+					 stored_nt->hash, challenge, 
+					 client_username, 
+					 client_domain,
+					 true,
+					 user_sess_key)) {
+			*lm_sess_key = *user_sess_key;
+			if (user_sess_key->length) {
+				lm_sess_key->length = 8;
+			}
+			return NT_STATUS_OK;
+		}
+		
+		DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
+		if (smb_pwd_check_ntlmv2(mem_ctx,
+					 nt_response, 
+					 stored_nt->hash, challenge, 
+					 client_username, 
+					 "",
+					 false,
+					 user_sess_key)) {
+			*lm_sess_key = *user_sess_key;
+			if (user_sess_key->length) {
+				lm_sess_key->length = 8;
+			}
+			return NT_STATUS_OK;
+		} else {
+			DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
+		}
+	} else if (nt_response->length == 24 && stored_nt) {
+		if (ntlm_auth) {		
+			/* We have the NT MD4 hash challenge available - see if we can
+			   use it (ie. does it exist in the smbpasswd file).
+			*/
+			DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
+			if (smb_pwd_check_ntlmv1(mem_ctx, 
+						 nt_response, 
+						 stored_nt->hash, challenge,
+						 user_sess_key)) {
+				/* The LM session key for this response is not very secure, 
+				   so use it only if we otherwise allow LM authentication */
+				
+				if (lanman_auth && stored_lanman) {
+					*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
+				}
+				return NT_STATUS_OK;
+			} else {
+				DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
+					 username));
+				return NT_STATUS_WRONG_PASSWORD;
+			}
+		} else {
+			DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
+				 username));			
+			/* no return, becouse we might pick up LMv2 in the LM field */
+		}
+	}
+	
+	if (lm_response->length == 0) {
+		DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
+			 username));
+		return NT_STATUS_WRONG_PASSWORD;
+	}
+	
+	if (lm_response->length < 24) {
+		DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n", 
+			 (unsigned long)nt_response->length, username));		
+		return NT_STATUS_WRONG_PASSWORD;
+	}
+		
+	if (!lanman_auth) {
+		DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
+			 username));
+	} else if (!stored_lanman) {
+		DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
+			 username));
+	} else if (strchr_m(username, '@')) {
+		DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
+			 username));
+	} else {
+		DEBUG(4,("ntlm_password_check: Checking LM password\n"));
+		if (smb_pwd_check_ntlmv1(mem_ctx,
+					 lm_response, 
+					 stored_lanman->hash, challenge,
+					 NULL)) {
+			/* The session key for this response is still very odd.  
+			   It not very secure, so use it only if we otherwise 
+			   allow LM authentication */
+
+			if (lanman_auth && stored_lanman) {
+				uint8_t first_8_lm_hash[16];
+				memcpy(first_8_lm_hash, stored_lanman->hash, 8);
+				memset(first_8_lm_hash + 8, '\0', 8);
+				*user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
+				*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
+			}
+			return NT_STATUS_OK;
+		}
+	}
+	
+	if (!stored_nt) {
+		DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
+		return NT_STATUS_WRONG_PASSWORD;
+	}
+	
+	/* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
+	   - related to Win9X, legacy NAS pass-though authentication
+	*/
+	DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
+	if (smb_pwd_check_ntlmv2(mem_ctx,
+				 lm_response, 
+				 stored_nt->hash, challenge, 
+				 client_username,
+				 client_domain,
+				 false,
+				 &tmp_sess_key)) {
+		if (nt_response->length > 24) {
+			/* If NTLMv2 authentication has preceeded us
+			 * (even if it failed), then use the session
+			 * key from that.  See the RPC-SAMLOGON
+			 * torture test */
+			smb_sess_key_ntlmv2(mem_ctx,
+					    nt_response, 
+					    stored_nt->hash, challenge, 
+					    client_username,
+					    client_domain,
+					    false,
+					    user_sess_key);
+		} else {
+			/* Otherwise, use the LMv2 session key */
+			*user_sess_key = tmp_sess_key;
+		}
+		*lm_sess_key = *user_sess_key;
+		if (user_sess_key->length) {
+			lm_sess_key->length = 8;
+		}
+		return NT_STATUS_OK;
+	}
+	
+	DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
+	if (smb_pwd_check_ntlmv2(mem_ctx,
+				 lm_response, 
+				 stored_nt->hash, challenge, 
+				 client_username,
+				 client_domain,
+				 true,
+				 &tmp_sess_key)) {
+		if (nt_response->length > 24) {
+			/* If NTLMv2 authentication has preceeded us
+			 * (even if it failed), then use the session
+			 * key from that.  See the RPC-SAMLOGON
+			 * torture test */
+			smb_sess_key_ntlmv2(mem_ctx,
+					    nt_response, 
+					    stored_nt->hash, challenge, 
+					    client_username,
+					    client_domain,
+					    true,
+					    user_sess_key);
+		} else {
+			/* Otherwise, use the LMv2 session key */
+			*user_sess_key = tmp_sess_key;
+		}
+		*lm_sess_key = *user_sess_key;
+		if (user_sess_key->length) {
+			lm_sess_key->length = 8;
+		}
+		return NT_STATUS_OK;
+	}
+	
+	DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
+	if (smb_pwd_check_ntlmv2(mem_ctx,
+				 lm_response, 
+				 stored_nt->hash, challenge, 
+				 client_username,
+				 "",
+				 false,
+				 &tmp_sess_key)) {
+		if (nt_response->length > 24) {
+			/* If NTLMv2 authentication has preceeded us
+			 * (even if it failed), then use the session
+			 * key from that.  See the RPC-SAMLOGON
+			 * torture test */
+			smb_sess_key_ntlmv2(mem_ctx,
+					    nt_response, 
+					    stored_nt->hash, challenge, 
+					    client_username,
+					    "",
+					    false,
+					    user_sess_key);
+		} else {
+			/* Otherwise, use the LMv2 session key */
+			*user_sess_key = tmp_sess_key;
+		}
+		*lm_sess_key = *user_sess_key;
+		if (user_sess_key->length) {
+			lm_sess_key->length = 8;
+		}
+		return NT_STATUS_OK;
+	}
+
+	/* Apparently NT accepts NT responses in the LM field
+	   - I think this is related to Win9X pass-though authentication
+	*/
+	DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
+	if (ntlm_auth) {
+		if (smb_pwd_check_ntlmv1(mem_ctx, 
+					 lm_response, 
+					 stored_nt->hash, challenge,
+					 NULL)) {
+			/* The session key for this response is still very odd.  
+			   It not very secure, so use it only if we otherwise 
+			   allow LM authentication */
+
+			if (lanman_auth && stored_lanman) {
+				uint8_t first_8_lm_hash[16];
+				memcpy(first_8_lm_hash, stored_lanman->hash, 8);
+				memset(first_8_lm_hash + 8, '\0', 8);
+				*user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
+				*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
+			}
+			return NT_STATUS_OK;
+		}
+		DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
+	} else {
+		DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
+	}
+
+	/* Try and match error codes */
+	if (strchr_m(username, '@')) {
+		return NT_STATUS_NOT_FOUND;
+	}
+	return NT_STATUS_WRONG_PASSWORD;
+}
+