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authorAndrew Bartlett <abartlet@samba.org>2003-12-30 07:33:58 +0000
committerAndrew Bartlett <abartlet@samba.org>2003-12-30 07:33:58 +0000
commitadc07646a3057e5c572edb3ebdac2367206aaeef (patch)
tree0a045c21928c9e02f89cbf737995fd71d4644cba /source3/auth
parentbccf3f374b984bf327057daa8d03374b70034d3b (diff)
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Move our basic password checking code from inside the authentication
subsystem into a seperate file - ntlm_check.c. This allows us to call these routines from ntlm_auth. The purpose of this exercise is to allow ntlm_auth (when operating as an NTLMSSP server) to avoid talking to winbind. This should allow for easier debugging. ntlm_auth itself has been reorgainised, so as to share more code between the SPNEGO-wrapped and 'raw' NTLMSSP modes. A new 'client' NTLMSSP mode has been added, for use with a Cyrus-SASL module I am writing (based on vl's work) Andrew Bartlett (This used to be commit 48315e8fd227978e0161be293ad4411b45e3ea5b)
Diffstat (limited to 'source3/auth')
-rw-r--r--source3/auth/auth_sam.c346
1 files changed, 1 insertions, 345 deletions
diff --git a/source3/auth/auth_sam.c b/source3/auth/auth_sam.c
index 04b587343a..ebb1e3d861 100644
--- a/source3/auth/auth_sam.c
+++ b/source3/auth/auth_sam.c
@@ -3,7 +3,7 @@
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Luke Kenneth Casson Leighton 1996-2000
- Copyright (C) Andrew Bartlett 2001
+ Copyright (C) Andrew Bartlett 2001-2003
Copyright (C) Gerald Carter 2003
This program is free software; you can redistribute it and/or modify
@@ -27,350 +27,6 @@
#define DBGC_CLASS DBGC_AUTH
/****************************************************************************
- Core of smb password checking routine.
-****************************************************************************/
-
-static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
- const uchar *part_passwd,
- const DATA_BLOB *sec_blob,
- DATA_BLOB *user_sess_key)
-{
- /* 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;
- }
-
- 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 (user_sess_key != NULL) {
- *user_sess_key = data_blob(NULL, 16);
- SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
- }
-
-
-
-#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
- return (memcmp(p24, nt_response->data, 24) == 0);
-}
-
-/****************************************************************************
- Core of smb password checking routine. (NTLMv2, LMv2)
- Note: The same code works with both NTLMv2 and LMv2.
-****************************************************************************/
-
-static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
- const uchar *part_passwd,
- const DATA_BLOB *sec_blob,
- const char *user, const char *domain,
- DATA_BLOB *user_sess_key)
-{
- /* Finish the encryption of part_passwd. */
- uchar kr[16];
- uchar value_from_encryption[16];
- uchar client_response[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 (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(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.
- */
-
- memcpy(client_response, ntv2_response->data, sizeof(client_response));
-
- if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
- return False;
- }
-
- SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
- if (user_sess_key != NULL) {
- *user_sess_key = data_blob(NULL, 16);
- SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
- }
-
-#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);
- return (memcmp(value_from_encryption, client_response, 16) == 0);
-}
-
-/**
- * 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 nt_pw MD4 unicode password from our passdb or similar
- * @param lm_pw LANMAN ASCII 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)
- */
-
-static NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
- 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 uint8 *lm_pw, const uint8 *nt_pw,
- DATA_BLOB *user_sess_key,
- DATA_BLOB *lm_sess_key)
-{
- static const unsigned char zeros[8];
- if (nt_pw == NULL) {
- DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
- username));
- }
-
- /* Check for cleartext netlogon. Used by Exchange 5.5. */
- if (challenge->length == sizeof(zeros) &&
- (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
-
- DEBUG(4,("sam_password_ok: checking plaintext passwords for user %s\n",
- username));
- if (nt_pw && nt_response->length) {
- unsigned char pwhash[16];
- mdfour(pwhash, nt_response->data, nt_response->length);
- if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("sam_password_ok: NT (Unicode) plaintext password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- } else if (!lp_lanman_auth()) {
- DEBUG(3,("sam_password_ok: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
- username));
-
- } else if (lm_pw && lm_response->length) {
- uchar dospwd[14];
- uchar p16[16];
- ZERO_STRUCT(dospwd);
-
- DEBUG(100, ("DOS password: %s\n"));
- memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
- /* Only the fisrt 14 chars are considered, password need not be null terminated. */
- E_P16((const unsigned char *)dospwd, p16);
-
- dump_data_pw("DOS password (first buffer)\n", dospwd, 14);
- dump_data_pw("DOS password (wire DES hash)\n", p16, 16);
- dump_data_pw("DOS password (passdb DES hash)\n", lm_pw, 16);
- if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("sam_password_ok: LANMAN (ASCII) plaintext password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- } else {
- DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- }
-
- if (nt_response->length != 0 && nt_response->length < 24) {
- DEBUG(2,("sam_password_ok: invalid NT password length (%lu) for user %s\n",
- (unsigned long)nt_response->length, username));
- }
-
- if (nt_response->length >= 24 && nt_pw) {
- if (nt_response->length > 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,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", client_domain));
- if (smb_pwd_check_ntlmv2( nt_response,
- nt_pw, challenge,
- client_username,
- client_domain,
- user_sess_key)) {
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
- if (smb_pwd_check_ntlmv2( nt_response,
- nt_pw, challenge,
- client_username,
- "",
- user_sess_key)) {
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
- return NT_STATUS_WRONG_PASSWORD;
- }
- }
-
- if (lp_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,("sam_password_ok: Checking NT MD4 password\n"));
- if (smb_pwd_check_ntlmv1(nt_response,
- nt_pw, 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 (lp_lanman_auth() && lm_pw) {
- uint8 first_8_lm_hash[16];
- memcpy(first_8_lm_hash, lm_pw, 8);
- memset(first_8_lm_hash + 8, '\0', 8);
- *lm_sess_key = data_blob(first_8_lm_hash, 16);
- }
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- } else {
- DEBUG(2,("sam_password_ok: 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,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- if (lm_response->length < 24) {
- DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n",
- (unsigned long)nt_response->length, username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- if (!lp_lanman_auth()) {
- DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",
- username));
- } else if (!lm_pw) {
- DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",
- username));
- } else {
- DEBUG(4,("sam_password_ok: Checking LM password\n"));
- if (smb_pwd_check_ntlmv1(lm_response,
- lm_pw, challenge,
- NULL)) {
- uint8 first_8_lm_hash[16];
- memcpy(first_8_lm_hash, lm_pw, 8);
- memset(first_8_lm_hash + 8, '\0', 8);
- *user_sess_key = data_blob(first_8_lm_hash, 16);
- *lm_sess_key = data_blob(first_8_lm_hash, 16);
- return NT_STATUS_OK;
- }
- }
-
- if (!nt_pw) {
- DEBUG(4,("sam_password_ok: 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,("sam_password_ok: Checking LMv2 password with domain %s\n", client_domain));
- if (smb_pwd_check_ntlmv2( lm_response,
- nt_pw, challenge,
- client_username,
- client_domain,
- NULL)) {
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
- if (smb_pwd_check_ntlmv2( lm_response,
- nt_pw, challenge,
- client_username,
- "",
- NULL)) {
- 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,("sam_password_ok: Checking NT MD4 password in LM field\n"));
- if (lp_ntlm_auth()) {
- if (smb_pwd_check_ntlmv1(lm_response,
- nt_pw, 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 (lp_lanman_auth() && lm_pw) {
- uint8 first_8_lm_hash[16];
- memcpy(first_8_lm_hash, lm_pw, 8);
- memset(first_8_lm_hash + 8, '\0', 8);
- *user_sess_key = data_blob(first_8_lm_hash, 16);
- *lm_sess_key = data_blob(first_8_lm_hash, 16);
- }
- return NT_STATUS_OK;
- }
- DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
- } else {
- DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
- }
- return NT_STATUS_WRONG_PASSWORD;
-}
-
-/****************************************************************************
Do a specific test for an smb password being correct, given a smb_password and
the lanman and NT responses.
****************************************************************************/