pampass.c

来自「samba-3.0.22.tar.gz 编译smb服务器的源码」· C语言 代码 · 共 876 行 · 第 1/2 页

		if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
			DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
			return True;
		}
	}
	DEBUG(2,("smb_pam_end: PAM: not initialised"));
	return False;
}

/*
 * Start PAM authentication for specified account
 */

static BOOL smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
{
	int pam_error;
	const char *our_rhost;

	*pamh = (pam_handle_t *)NULL;

	DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));

	pam_error = pam_start("samba", user, pconv, pamh);
	if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
		*pamh = (pam_handle_t *)NULL;
		return False;
	}

	if (rhost == NULL) {
		our_rhost = client_name();
		if (strequal(our_rhost,"UNKNOWN"))
			our_rhost = client_addr();
	} else {
		our_rhost = rhost;
	}

#ifdef PAM_RHOST
	DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
	pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
	if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
		smb_pam_end(*pamh, pconv);
		*pamh = (pam_handle_t *)NULL;
		return False;
	}
#endif
#ifdef PAM_TTY
	DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
	pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
	if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
		smb_pam_end(*pamh, pconv);
		*pamh = (pam_handle_t *)NULL;
		return False;
	}
#endif
	DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
	return True;
}

/*
 * PAM Authentication Handler
 */
static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
{
	int pam_error;
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;

	/*
	 * To enable debugging set in /etc/pam.d/samba:
	 *	auth required /lib/security/pam_pwdb.so nullok shadow audit
	 */
	
	DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
	pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
	switch( pam_error ){
		case PAM_AUTH_ERR:
			DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
			break;
		case PAM_CRED_INSUFFICIENT:
			DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
			break;
		case PAM_AUTHINFO_UNAVAIL:
			DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
			break;
		case PAM_MAXTRIES:
			DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
			break;
		case PAM_ABORT:
			DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
			break;
		default:
			DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
	return nt_status;
}

/* 
 * PAM Account Handler
 */
static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
{
	int pam_error;
	NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;

	DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
	pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
	switch( pam_error ) {
		case PAM_AUTHTOK_EXPIRED:
			DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
			break;
		case PAM_ACCT_EXPIRED:
			DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
			break;
		case PAM_AUTH_ERR:
			DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
			break;
		case PAM_PERM_DENIED:
			DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
			break;
		default:
			DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
	return nt_status;
}

/*
 * PAM Credential Setting
 */

static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
{
	int pam_error;
	NTSTATUS nt_status = NT_STATUS_NO_TOKEN;

	/*
	 * This will allow samba to aquire a kerberos token. And, when
	 * exporting an AFS cell, be able to /write/ to this cell.
	 */

	DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
	pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT)); 
	switch( pam_error ) {
		case PAM_CRED_UNAVAIL:
			DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
			break;
		case PAM_CRED_EXPIRED:
			DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
			break;
		case PAM_CRED_ERR:
			DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
			break;
		default:
			DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
	return nt_status;
}

/*
 * PAM Internal Session Handler
 */
static BOOL smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, BOOL flag)
{
	int pam_error;

#ifdef PAM_TTY
	DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
	pam_error = pam_set_item(pamh, PAM_TTY, tty);
	if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
		return False;
#endif

	if (flag) {
		pam_error = pam_open_session(pamh, PAM_SILENT);
		if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
			return False;
	} else {
		pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
		pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
		if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
			return False;
	}
	return (True);
}

/*
 * Internal PAM Password Changer.
 */

static BOOL smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
{
	int pam_error;

	DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));

	pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */

	switch( pam_error ) {
	case PAM_AUTHTOK_ERR:
		DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
		break;

	/* This doesn't seem to be defined on Solaris. JRA */
#ifdef PAM_AUTHTOK_RECOVER_ERR
	case PAM_AUTHTOK_RECOVER_ERR:
		DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
		break;
#endif

	case PAM_AUTHTOK_LOCK_BUSY:
		DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
		break;
	case PAM_AUTHTOK_DISABLE_AGING:
		DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
		break;
	case PAM_PERM_DENIED:
		DEBUG(0, ("PAM: Permission denied.\n"));
		break;
	case PAM_TRY_AGAIN:
		DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
		break;
	case PAM_USER_UNKNOWN:
		DEBUG(0, ("PAM: User not known to PAM\n"));
		break;
	case PAM_SUCCESS:
		DEBUG(4, ("PAM: Account OK for User: %s\n", user));
		break;
	default:
		DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
	}
 
	if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
		return False;
	}

	/* If this point is reached, the password has changed. */
	return True;
}

/*
 * PAM Externally accessible Session handler
 */

BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
{
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return True;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return False;

	if (!smb_pam_start(&pamh, user, rhost, pconv))
		return False;

	if (!smb_internal_pam_session(pamh, user, tty, True)) {
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

/*
 * PAM Externally accessible Session handler
 */

BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
{
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return True;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return False;

	if (!smb_pam_start(&pamh, user, rhost, pconv))
		return False;

	if (!smb_internal_pam_session(pamh, user, tty, False)) {
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

/*
 * PAM Externally accessible Account handler
 */

NTSTATUS smb_pam_accountcheck(const char * user)
{
	NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return NT_STATUS_OK;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return NT_STATUS_NO_MEMORY;

	if (!smb_pam_start(&pamh, user, NULL, pconv))
		return NT_STATUS_ACCOUNT_DISABLED;

	if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
		DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));

	smb_pam_end(pamh, pconv);
	return nt_status;
}

/*
 * PAM Password Validation Suite
 */

NTSTATUS smb_pam_passcheck(const char * user, const char * password)
{
	pam_handle_t *pamh = NULL;
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
	struct pam_conv *pconv = NULL;

	/*
	 * Note we can't ignore PAM here as this is the only
	 * way of doing auths on plaintext passwords when
	 * compiled --with-pam.
	 */

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
		return NT_STATUS_LOGON_FAILURE;

	if (!smb_pam_start(&pamh, user, NULL, pconv))
		return NT_STATUS_LOGON_FAILURE;

	if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	smb_pam_end(pamh, pconv);
	return nt_status;
}

/*
 * PAM Password Change Suite
 */

BOOL smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
{
	/* Appropriate quantities of root should be obtained BEFORE calling this function */
	struct pam_conv *pconv = NULL;
	pam_handle_t *pamh = NULL;

	if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
		return False;

	if(!smb_pam_start(&pamh, user, NULL, pconv))
		return False;

	if (!smb_pam_chauthtok(pamh, user)) {
		DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

#else

/* If PAM not used, no PAM restrictions on accounts. */
NTSTATUS smb_pam_accountcheck(const char * user)
{
	return NT_STATUS_OK;
}

/* If PAM not used, also no PAM restrictions on sessions. */
BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
{
	return True;
}

/* If PAM not used, also no PAM restrictions on sessions. */
BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
{
	return True;
}
#endif /* WITH_PAM */