ntlm_auth.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
   Unix SMB/CIFS implementation.

   Winbind status program.

   Copyright (C) Tim Potter      2000-2003
   Copyright (C) Andrew Bartlett <[e-mail]> 2003-2004
   Copyright (C) Francesco Chemolli <[e-mail]> 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 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"
#include "utils/ntlm_auth.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

#define SQUID_BUFFER_SIZE 2010

enum stdio_helper_mode {
	SQUID_2_4_BASIC,
	SQUID_2_5_BASIC,
	SQUID_2_5_NTLMSSP,
	NTLMSSP_CLIENT_1,
	GSS_SPNEGO,
	GSS_SPNEGO_CLIENT,
	NTLM_SERVER_1,
	NUM_HELPER_MODES
};

typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode, 
				     char *buf, int length);

static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode, 
					char *buf, int length);

static void manage_squid_ntlmssp_request (enum stdio_helper_mode stdio_helper_mode, 
					  char *buf, int length);

static void manage_client_ntlmssp_request (enum stdio_helper_mode stdio_helper_mode, 
					   char *buf, int length);

static void manage_gss_spnego_request (enum stdio_helper_mode stdio_helper_mode, 
				       char *buf, int length);

static void manage_gss_spnego_client_request (enum stdio_helper_mode stdio_helper_mode, 
					      char *buf, int length);

static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode, 
					  char *buf, int length);

static const struct {
	enum stdio_helper_mode mode;
	const char *name;
	stdio_helper_function fn;
} stdio_helper_protocols[] = {
	{ SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
	{ SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
	{ SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_squid_ntlmssp_request},
	{ NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_client_ntlmssp_request},
	{ GSS_SPNEGO, "gss-spnego", manage_gss_spnego_request},
	{ GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gss_spnego_client_request},
	{ NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
	{ NUM_HELPER_MODES, NULL, NULL}
};

extern int winbindd_fd;

const char *opt_username;
const char *opt_domain;
const char *opt_workstation;
const char *opt_password;
static DATA_BLOB opt_challenge;
static DATA_BLOB opt_lm_response;
static DATA_BLOB opt_nt_response;
static int request_lm_key;
static int request_user_session_key;

static const char *require_membership_of;
static const char *require_membership_of_sid;

static char winbind_separator(void)
{
	struct winbindd_response response;
	static BOOL got_sep;
	static char sep;

	if (got_sep)
		return sep;

	ZERO_STRUCT(response);

	/* Send off request */

	if (winbindd_request_response(WINBINDD_INFO, NULL, &response) !=
	    NSS_STATUS_SUCCESS) {
		d_printf("could not obtain winbind separator!\n");
		return *lp_winbind_separator();
	}

	sep = response.data.info.winbind_separator;
	got_sep = True;

	if (!sep) {
		d_printf("winbind separator was NULL!\n");
		return *lp_winbind_separator();
	}
	
	return sep;
}

const char *get_winbind_domain(void)
{
	struct winbindd_response response;

	static fstring winbind_domain;
	if (*winbind_domain) {
		return winbind_domain;
	}

	ZERO_STRUCT(response);

	/* Send off request */

	if (winbindd_request_response(WINBINDD_DOMAIN_NAME, NULL, &response) !=
	    NSS_STATUS_SUCCESS) {
		DEBUG(0, ("could not obtain winbind domain name!\n"));
		return lp_workgroup();
	}

	fstrcpy(winbind_domain, response.data.domain_name);

	return winbind_domain;

}

const char *get_winbind_netbios_name(void)
{
	struct winbindd_response response;

	static fstring winbind_netbios_name;

	if (*winbind_netbios_name) {
		return winbind_netbios_name;
	}

	ZERO_STRUCT(response);

	/* Send off request */

	if (winbindd_request_response(WINBINDD_NETBIOS_NAME, NULL, &response) !=
	    NSS_STATUS_SUCCESS) {
		DEBUG(0, ("could not obtain winbind netbios name!\n"));
		return global_myname();
	}

	fstrcpy(winbind_netbios_name, response.data.netbios_name);

	return winbind_netbios_name;

}

DATA_BLOB get_challenge(void) 
{
	static DATA_BLOB chal;
	if (opt_challenge.length)
		return opt_challenge;
	
	chal = data_blob(NULL, 8);

	generate_random_buffer(chal.data, chal.length);
	return chal;
}

/* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
   form DOMAIN/user into a domain and a user */

static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain, 
				     fstring user)
{

	char *p = strchr(domuser,winbind_separator());

	if (!p) {
		return False;
	}
        
	fstrcpy(user, p+1);
	fstrcpy(domain, domuser);
	domain[PTR_DIFF(p, domuser)] = 0;
	strupper_m(domain);

	return True;
}

static BOOL get_require_membership_sid(void) {
	struct winbindd_request request;
	struct winbindd_response response;

	if (!require_membership_of) {
		return True;
	}

	if (require_membership_of_sid) {
		return True;
	}

	/* Otherwise, ask winbindd for the name->sid request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (!parse_ntlm_auth_domain_user(require_membership_of, 
					 request.data.name.dom_name, 
					 request.data.name.name)) {
		DEBUG(0, ("Could not parse %s into seperate domain/name parts!\n", 
			  require_membership_of));
		return False;
	}

	if (winbindd_request_response(WINBINDD_LOOKUPNAME, &request, &response) !=
	    NSS_STATUS_SUCCESS) {
		DEBUG(0, ("Winbindd lookupname failed to resolve %s into a SID!\n", 
			  require_membership_of));
		return False;
	}

	require_membership_of_sid = SMB_STRDUP(response.data.sid.sid);

	if (require_membership_of_sid)
		return True;

	return False;
}
/* Authenticate a user with a plaintext password */

static BOOL check_plaintext_auth(const char *user, const char *pass, 
				 BOOL stdout_diagnostics)
{
	struct winbindd_request request;
	struct winbindd_response response;
        NSS_STATUS result;

	if (!get_require_membership_sid()) {
		return False;
	}

	/* Send off request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	fstrcpy(request.data.auth.user, user);
	fstrcpy(request.data.auth.pass, pass);
	if (require_membership_of_sid)
		fstrcpy(request.data.auth.require_membership_of_sid, require_membership_of_sid);

	result = winbindd_request_response(WINBINDD_PAM_AUTH, &request, &response);

	/* Display response */
	
	if (stdout_diagnostics) {
		if ((result != NSS_STATUS_SUCCESS) && (response.data.auth.nt_status == 0)) {
			d_printf("Reading winbind reply failed! (0x01)\n");
		}
		
		d_printf("%s: %s (0x%x)\n", 
			 response.data.auth.nt_status_string, 
			 response.data.auth.error_string, 
			 response.data.auth.nt_status);
	} else {
		if ((result != NSS_STATUS_SUCCESS) && (response.data.auth.nt_status == 0)) {
			DEBUG(1, ("Reading winbind reply failed! (0x01)\n"));
		}
		
		DEBUG(3, ("%s: %s (0x%x)\n", 
			  response.data.auth.nt_status_string, 
			  response.data.auth.error_string,
			  response.data.auth.nt_status));		
	}
		
        return (result == NSS_STATUS_SUCCESS);
}

/* authenticate a user with an encrypted username/password */

NTSTATUS contact_winbind_auth_crap(const char *username, 
				   const char *domain, 
				   const char *workstation,
				   const DATA_BLOB *challenge, 
				   const DATA_BLOB *lm_response, 
				   const DATA_BLOB *nt_response, 
				   uint32 flags, 
				   uint8 lm_key[8], 
				   uint8 user_session_key[16], 
				   char **error_string, 
				   char **unix_name) 
{
	NTSTATUS nt_status;
        NSS_STATUS result;
	struct winbindd_request request;
	struct winbindd_response response;

	if (!get_require_membership_sid()) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	request.flags = flags;

	request.data.auth_crap.logon_parameters = MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT | MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT;

	if (require_membership_of_sid)
		fstrcpy(request.data.auth_crap.require_membership_of_sid, require_membership_of_sid);

        fstrcpy(request.data.auth_crap.user, username);
	fstrcpy(request.data.auth_crap.domain, domain);

	fstrcpy(request.data.auth_crap.workstation, 
		workstation);

	memcpy(request.data.auth_crap.chal, challenge->data, MIN(challenge->length, 8));

	if (lm_response && lm_response->length) {
		memcpy(request.data.auth_crap.lm_resp, 
		       lm_response->data, 
		       MIN(lm_response->length, sizeof(request.data.auth_crap.lm_resp)));
		request.data.auth_crap.lm_resp_len = lm_response->length;
	}

	if (nt_response && nt_response->length) {
		memcpy(request.data.auth_crap.nt_resp, 
		       nt_response->data, 
		       MIN(nt_response->length, sizeof(request.data.auth_crap.nt_resp)));
                request.data.auth_crap.nt_resp_len = nt_response->length;
	}
	
	result = winbindd_request_response(WINBINDD_PAM_AUTH_CRAP, &request, &response);

	/* Display response */

	if ((result != NSS_STATUS_SUCCESS) && (response.data.auth.nt_status == 0)) {
		nt_status = NT_STATUS_UNSUCCESSFUL;
		if (error_string)
			*error_string = smb_xstrdup("Reading winbind reply failed!");
		free_response(&response);
		return nt_status;
	}
	
	nt_status = (NT_STATUS(response.data.auth.nt_status));
	if (!NT_STATUS_IS_OK(nt_status)) {
		if (error_string) 
			*error_string = smb_xstrdup(response.data.auth.error_string);
		free_response(&response);
		return nt_status;
	}

	if ((flags & WBFLAG_PAM_LMKEY) && lm_key) {
		memcpy(lm_key, response.data.auth.first_8_lm_hash, 
		       sizeof(response.data.auth.first_8_lm_hash));
	}
	if ((flags & WBFLAG_PAM_USER_SESSION_KEY) && user_session_key) {
		memcpy(user_session_key, response.data.auth.user_session_key, 
			sizeof(response.data.auth.user_session_key));
	}

	if (flags & WBFLAG_PAM_UNIX_NAME) {
		*unix_name = SMB_STRDUP((char *)response.extra_data);
		if (!*unix_name) {
			free_response(&response);
			return NT_STATUS_NO_MEMORY;
		}
	}

	free_response(&response);
	return nt_status;
}
				   
static NTSTATUS winbind_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 
{
	static const char zeros[16];
	NTSTATUS nt_status;
	char *error_string;
	uint8 lm_key[8]; 
	uint8 user_sess_key[16]; 
	char *unix_name;

	nt_status = contact_winbind_auth_crap(ntlmssp_state->user, ntlmssp_state->domain,
					      ntlmssp_state->workstation,
					      &ntlmssp_state->chal,
					      &ntlmssp_state->lm_resp,
					      &ntlmssp_state->nt_resp, 
					      WBFLAG_PAM_LMKEY | WBFLAG_PAM_USER_SESSION_KEY | WBFLAG_PAM_UNIX_NAME,
					      lm_key, user_sess_key, 
					      &error_string, &unix_name);

	if (NT_STATUS_IS_OK(nt_status)) {
		if (memcmp(lm_key, zeros, 8) != 0) {
			*lm_session_key = data_blob(NULL, 16);
			memcpy(lm_session_key->data, lm_key, 8);
			memset(lm_session_key->data+8, '\0', 8);
		}
		
		if (memcmp(user_sess_key, zeros, 16) != 0) {
			*user_session_key = data_blob(user_sess_key, 16);
		}
		ntlmssp_state->auth_context = talloc_strdup(ntlmssp_state->mem_ctx, unix_name);
		SAFE_FREE(unix_name);
	} else {
		DEBUG(NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED) ? 0 : 3, 
		      ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n", 
		       ntlmssp_state->domain, ntlmssp_state->user, 
		       ntlmssp_state->workstation, 
		       error_string ? error_string : "unknown error (NULL)"));
		ntlmssp_state->auth_context = NULL;
	}
	return nt_status;
}

static NTSTATUS local_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 
{
	NTSTATUS nt_status;
	uint8 lm_pw[16], nt_pw[16];

	nt_lm_owf_gen (opt_password, nt_pw, lm_pw);
	
	nt_status = ntlm_password_check(ntlmssp_state->mem_ctx, 
					&ntlmssp_state->chal,
					&ntlmssp_state->lm_resp,
					&ntlmssp_state->nt_resp, 
					NULL, NULL,
					ntlmssp_state->user, 
					ntlmssp_state->user, 
					ntlmssp_state->domain,
					lm_pw, nt_pw, user_session_key, lm_session_key);
	
	if (NT_STATUS_IS_OK(nt_status)) {
		ntlmssp_state->auth_context = talloc_asprintf(ntlmssp_state->mem_ctx, 
							      "%s%c%s", ntlmssp_state->domain, 
							      *lp_winbind_separator(), 
							      ntlmssp_state->user);
	} else {
		DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n", 
			  ntlmssp_state->domain, ntlmssp_state->user, ntlmssp_state->workstation, 
			  nt_errstr(nt_status)));
		ntlmssp_state->auth_context = NULL;
	}
	return nt_status;
}

static NTSTATUS ntlm_auth_start_ntlmssp_client(NTLMSSP_STATE **client_ntlmssp_state) 
{
	NTSTATUS status;
	if ( (opt_username == NULL) || (opt_domain == NULL) ) {
		status = NT_STATUS_UNSUCCESSFUL;