s3: Move check_sam_security to auth/check_sam.c

1 files changed, 512 insertions, 0 deletions

diff --git a/source3/auth/check_samsec.c b/source3/auth/check_samsec.c
new file mode 100644
index 0000000000..bd8cb4bb64
--- /dev/null
+++ b/source3/auth/check_samsec.c
@@ -0,0 +1,512 @@
+/*
+   Unix SMB/CIFS implementation.
+   Password and authentication handling
+   Copyright (C) Andrew Tridgell              1992-2000
+   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
+   Copyright (C) Andrew Bartlett              2001-2003
+   Copyright (C) Gerald Carter                2003
+
+   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 "../libcli/auth/libcli_auth.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+/****************************************************************************
+ Do a specific test for an smb password being correct, given a smb_password and
+ the lanman and NT responses.
+****************************************************************************/
+
+static NTSTATUS sam_password_ok(TALLOC_CTX *mem_ctx,
+				const char *username,
+				uint32_t acct_ctrl,
+				const DATA_BLOB *challenge,
+				const uint8_t *lm_pw,
+				const uint8_t *nt_pw,
+				const struct auth_usersupplied_info *user_info,
+				DATA_BLOB *user_sess_key,
+				DATA_BLOB *lm_sess_key)
+{
+	struct samr_Password _lm_hash, _nt_hash, _client_lm_hash, _client_nt_hash;
+	struct samr_Password *lm_hash = NULL;
+	struct samr_Password *nt_hash = NULL;
+	struct samr_Password *client_lm_hash = NULL;
+	struct samr_Password *client_nt_hash = NULL;
+
+	*user_sess_key = data_blob_null;
+	*lm_sess_key = data_blob_null;
+
+	if (acct_ctrl & ACB_PWNOTREQ) {
+		if (lp_null_passwords()) {
+			DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
+			return NT_STATUS_OK;
+		} else {
+			DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
+			return NT_STATUS_LOGON_FAILURE;
+		}
+	}
+
+	if (lm_pw) {
+		memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
+		lm_hash = &_lm_hash;
+	}
+	if (nt_pw) {
+		memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
+		nt_hash = &_nt_hash;
+	}
+	if (user_info->lm_interactive_pwd.data && sizeof(_client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
+		memcpy(_client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(_lm_hash.hash));
+		client_lm_hash = &_client_lm_hash;
+	}
+	if (user_info->nt_interactive_pwd.data && sizeof(_client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
+		memcpy(_client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(_nt_hash.hash));
+		client_nt_hash = &_client_nt_hash;
+	}
+
+	if (client_lm_hash || client_nt_hash) {
+		*user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
+		if (!user_sess_key->data) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
+		return hash_password_check(mem_ctx, lp_lanman_auth(),
+					   client_lm_hash,
+					   client_nt_hash,
+					   username,
+					   lm_hash,
+					   nt_hash);
+	} else {
+		return ntlm_password_check(mem_ctx, lp_lanman_auth(),
+					   lp_ntlm_auth(),
+					   user_info->logon_parameters,
+					   challenge,
+					   &user_info->lm_resp, &user_info->nt_resp,
+					   username,
+					   user_info->smb_name,
+					   user_info->client_domain,
+					   lm_hash,
+					   nt_hash,
+					   user_sess_key, lm_sess_key);
+	}
+}
+
+/****************************************************************************
+ Check if a user is allowed to logon at this time. Note this is the
+ servers local time, as logon hours are just specified as a weekly
+ bitmask.
+****************************************************************************/
+
+static bool logon_hours_ok(struct samu *sampass)
+{
+	/* In logon hours first bit is Sunday from 12AM to 1AM */
+	const uint8 *hours;
+	struct tm *utctime;
+	time_t lasttime;
+	const char *asct;
+	uint8 bitmask, bitpos;
+
+	hours = pdb_get_hours(sampass);
+	if (!hours) {
+		DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
+		return True;
+	}
+
+	lasttime = time(NULL);
+	utctime = gmtime(&lasttime);
+	if (!utctime) {
+		DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
+			pdb_get_username(sampass) ));
+		return False;
+	}
+
+	/* find the corresponding byte and bit */
+	bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
+	bitmask = 1 << (bitpos % 8);
+
+	if (! (hours[bitpos/8] & bitmask)) {
+		struct tm *t = localtime(&lasttime);
+		if (!t) {
+			asct = "INVALID TIME";
+		} else {
+			asct = asctime(t);
+			if (!asct) {
+				asct = "INVALID TIME";
+			}
+		}
+
+		DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
+			  "logon at this time (%s).\n",
+			  pdb_get_username(sampass), asct ));
+		return False;
+	}
+
+	asct = asctime(utctime);
+	DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
+		pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
+
+	return True;
+}
+
+/****************************************************************************
+ Do a specific test for a struct samu being valid for this connection
+ (ie not disabled, expired and the like).
+****************************************************************************/
+
+static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
+			       struct samu *sampass,
+			       const struct auth_usersupplied_info *user_info)
+{
+	uint32	acct_ctrl = pdb_get_acct_ctrl(sampass);
+	char *workstation_list;
+	time_t kickoff_time;
+
+	DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
+
+	/* Quit if the account was disabled. */
+	if (acct_ctrl & ACB_DISABLED) {
+		DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
+		return NT_STATUS_ACCOUNT_DISABLED;
+	}
+
+	/* Quit if the account was locked out. */
+	if (acct_ctrl & ACB_AUTOLOCK) {
+		DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
+		return NT_STATUS_ACCOUNT_LOCKED_OUT;
+	}
+
+	/* Quit if the account is not allowed to logon at this time. */
+	if (! logon_hours_ok(sampass)) {
+		return NT_STATUS_INVALID_LOGON_HOURS;
+	}
+
+	/* Test account expire time */
+
+	kickoff_time = pdb_get_kickoff_time(sampass);
+	if (kickoff_time != 0 && time(NULL) > kickoff_time) {
+		DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
+		DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
+		return NT_STATUS_ACCOUNT_EXPIRED;
+	}
+
+	if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
+		time_t must_change_time = pdb_get_pass_must_change_time(sampass);
+		time_t last_set_time = pdb_get_pass_last_set_time(sampass);
+
+		/* check for immediate expiry "must change at next logon"
+		 * for a user account. */
+		if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
+			DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
+			return NT_STATUS_PASSWORD_MUST_CHANGE;
+		}
+
+		/* check for expired password */
+		if (must_change_time < time(NULL) && must_change_time != 0) {
+			DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
+			DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
+			return NT_STATUS_PASSWORD_EXPIRED;
+		}
+	}
+
+	/* Test workstation. Workstation list is comma separated. */
+
+	workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
+	if (!workstation_list)
+		return NT_STATUS_NO_MEMORY;
+
+	if (*workstation_list) {
+		bool invalid_ws = True;
+		char *tok = NULL;
+		const char *s = workstation_list;
+		char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
+
+		if (machine_name == NULL)
+			return NT_STATUS_NO_MEMORY;
+
+		while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
+			DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
+				  tok, user_info->wksta_name));
+			if(strequal(tok, user_info->wksta_name)) {
+				invalid_ws = False;
+				break;
+			}
+			if (tok[0] == '+') {
+				DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
+					machine_name, tok + 1));
+				if (user_in_group(machine_name, tok + 1)) {
+					invalid_ws = False;
+					break;
+				}
+			}
+			TALLOC_FREE(tok);
+		}
+		TALLOC_FREE(tok);
+		TALLOC_FREE(machine_name);
+
+		if (invalid_ws)
+			return NT_STATUS_INVALID_WORKSTATION;
+	}
+
+	if (acct_ctrl & ACB_DOMTRUST) {
+		DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
+		return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
+	}
+
+	if (acct_ctrl & ACB_SVRTRUST) {
+		if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
+			DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
+			return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
+		}
+	}
+
+	if (acct_ctrl & ACB_WSTRUST) {
+		if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
+			DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
+			return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
+		}
+	}
+	return NT_STATUS_OK;
+}
+
+/**
+ * Check whether the given password is one of the last two
+ * password history entries. If so, the bad pwcount should
+ * not be incremented even thought the actual password check
+ * failed.
+ */
+static bool need_to_increment_bad_pw_count(
+	const DATA_BLOB *challenge,
+	struct samu* sampass,
+	const struct auth_usersupplied_info *user_info)
+{
+	uint8_t i;
+	const uint8_t *pwhistory;
+	uint32_t pwhistory_len;
+	uint32_t policy_pwhistory_len;
+	uint32_t acct_ctrl;
+	const char *username;
+	TALLOC_CTX *mem_ctx = talloc_stackframe();
+	bool result = true;
+
+	pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY,
+			       &policy_pwhistory_len);
+	if (policy_pwhistory_len == 0) {
+		goto done;
+	}
+
+	pwhistory = pdb_get_pw_history(sampass, &pwhistory_len);
+	if (!pwhistory || pwhistory_len == 0) {
+		goto done;
+	}
+
+	acct_ctrl = pdb_get_acct_ctrl(sampass);
+	username = pdb_get_username(sampass);
+
+	for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) {
+		static const uint8_t zero16[SALTED_MD5_HASH_LEN];
+		const uint8_t *salt;
+		const uint8_t *nt_pw;
+		NTSTATUS status;
+		DATA_BLOB user_sess_key = data_blob_null;
+		DATA_BLOB lm_sess_key = data_blob_null;
+
+		salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
+		nt_pw = salt + PW_HISTORY_SALT_LEN;
+
+		if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) {
+			/* skip zero password hash */
+			continue;
+		}
+
+		if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) {
+			/* skip nonzero salt (old format entry) */
+			continue;
+		}
+
+		status = sam_password_ok(mem_ctx,
+					 username, acct_ctrl,
+					 challenge,
+					 NULL, nt_pw,
+					 user_info, &user_sess_key, &lm_sess_key);
+		if (NT_STATUS_IS_OK(status)) {
+			result = false;
+			break;
+		}
+	}
+
+done:
+	TALLOC_FREE(mem_ctx);
+	return result;
+}
+
+/****************************************************************************
+check if a username/password is OK assuming the password is a 24 byte
+SMB hash supplied in the user_info structure
+return an NT_STATUS constant.
+****************************************************************************/
+
+NTSTATUS check_sam_security(const DATA_BLOB *challenge,
+			    TALLOC_CTX *mem_ctx,
+			    const struct auth_usersupplied_info *user_info,
+			    struct auth_serversupplied_info **server_info)
+{
+	struct samu *sampass=NULL;
+	bool ret;
+	NTSTATUS nt_status;
+	NTSTATUS update_login_attempts_status;
+	DATA_BLOB user_sess_key = data_blob_null;
+	DATA_BLOB lm_sess_key = data_blob_null;
+	bool updated_autolock = False, updated_badpw = False;
+	const char *username;
+	const uint8_t *nt_pw;
+	const uint8_t *lm_pw;
+
+	/* the returned struct gets kept on the server_info, by means
+	   of a steal further down */
+
+	sampass = samu_new(mem_ctx);
+	if (sampass == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* get the account information */
+
+	become_root();
+	ret = pdb_getsampwnam(sampass, user_info->internal_username);
+	unbecome_root();
+
+	if (ret == False) {
+		DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
+			 "passdb.\n", user_info->internal_username));
+		TALLOC_FREE(sampass);
+		return NT_STATUS_NO_SUCH_USER;
+	}
+
+	username = pdb_get_username(sampass);
+	nt_pw = pdb_get_nt_passwd(sampass);
+	lm_pw = pdb_get_lanman_passwd(sampass);
+
+	/* see if autolock flag needs to be updated */
+	if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
+		pdb_update_autolock_flag(sampass, &updated_autolock);
+	/* Quit if the account was locked out. */
+	if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
+		DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
+		return NT_STATUS_ACCOUNT_LOCKED_OUT;
+	}
+
+	nt_status = sam_password_ok(mem_ctx,
+				    username, pdb_get_acct_ctrl(sampass),
+				    challenge, lm_pw, nt_pw,
+				    user_info, &user_sess_key, &lm_sess_key);
+
+	/* Notify passdb backend of login success/failure. If not
+	   NT_STATUS_OK the backend doesn't like the login */
+
+	update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		bool increment_bad_pw_count = false;
+
+		if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
+		    pdb_get_acct_ctrl(sampass) & ACB_NORMAL &&
+		    NT_STATUS_IS_OK(update_login_attempts_status))
+		{
+			increment_bad_pw_count =
+				need_to_increment_bad_pw_count(
+					challenge, sampass, user_info);
+		}
+
+		if (increment_bad_pw_count) {
+			pdb_increment_bad_password_count(sampass);
+			updated_badpw = True;
+		} else {
+			pdb_update_bad_password_count(sampass,
+						      &updated_badpw);
+		}
+		if (updated_autolock || updated_badpw){
+			NTSTATUS status;
+
+			become_root();
+			status = pdb_update_sam_account(sampass);
+			unbecome_root();
+
+			if (!NT_STATUS_IS_OK(status)) {
+				DEBUG(1, ("Failed to modify entry: %s\n",
+					  nt_errstr(status)));
+			}
+		}
+		goto done;
+	}
+
+	if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
+	    (pdb_get_bad_password_count(sampass) > 0)){
+		pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
+		pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
+		updated_badpw = True;
+	}
+
+	if (updated_autolock || updated_badpw){
+		NTSTATUS status;
+
+		become_root();
+		status = pdb_update_sam_account(sampass);
+		unbecome_root();
+
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to modify entry: %s\n",
+				  nt_errstr(status)));
+		}
+	}
+
+	nt_status = sam_account_ok(mem_ctx, sampass, user_info);
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		goto done;
+	}
+
+	become_root();
+	nt_status = make_server_info_sam(server_info, sampass);
+	unbecome_root();
+	/*
+	 * sampass has been stolen to server_info.
+	 * So NULL it out to prevent segfaults.
+	 */
+	sampass = NULL;
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
+		goto done;
+	}
+
+	(*server_info)->user_session_key =
+		data_blob_talloc(*server_info, user_sess_key.data,
+				 user_sess_key.length);
+	data_blob_free(&user_sess_key);
+
+	(*server_info)->lm_session_key =
+		data_blob_talloc(*server_info, lm_sess_key.data,
+				 lm_sess_key.length);
+	data_blob_free(&lm_sess_key);
+
+	(*server_info)->nss_token |= user_info->was_mapped;
+
+done:
+	TALLOC_FREE(sampass);
+	data_blob_free(&user_sess_key);
+	data_blob_free(&lm_sess_key);
+	return nt_status;
+}