sudo/auth/bsdauth.c

/*
 * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 4. Products derived from this software may not be called "Sudo" nor
 *    may "Sudo" appear in their names without specific prior written
 *    permission from the author.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <sys/param.h>
#include <sys/types.h>
#include <pwd.h>

#include <login_cap.h>
#include <bsd_auth.h>

#include "sudo.h"
#include "sudo_auth.h"

#ifndef lint
static const char rcsid[] = "$Sudo$";
#endif /* lint */

extern char *login_style;		/* from sudo.c */

int
bsdauth_init(pw, promptp, auth)
    struct passwd *pw;
    char **promptp;
    sudo_auth *auth;
{
    static auth_session_t *as;
    extern login_cap_t *lc;			/* from sudo.c */

    if ((as = auth_open()) == NULL) {
	log_error(USE_ERRNO|NO_EXIT|NO_MAIL, 
	    "unable to begin bsd authentication");
	return(AUTH_FATAL);
    }

    /* XXX - maybe sanity check the auth style earlier? */
    login_style = login_getstyle(lc, login_style, "auth-sudo");
    if (login_style == NULL) {
	log_error(NO_EXIT|NO_MAIL, "invalid authentication type");
	auth_close(as);
	return(AUTH_FATAL);
    }

    auth->data = (VOID *) as;
    return(AUTH_SUCCESS);
}

/* XXX - doesn't deal with custom prompts yet (have to use lower-level funcs) */
int
bsdauth_verify(pw, prompt, auth)
    struct passwd *pw;
    char *prompt;
    sudo_auth *auth;
{
    char *s;
    int authok;
    sig_t childkiller;
    auth_session_t *as = (auth_session_t *) auth->data;

    /* save old signal handler */
    childkiller = signal(SIGCHLD, SIG_DFL);

    auth_verify(as, login_style, pw->pw_name, login_class, NULL);

    /* restore old signal handler */
    (void)signal(SIGCHLD, childkiller);

    authok = auth_getstate(as);
    if ((authok & AUTH_ALLOW))
	return(AUTH_SUCCESS);

    if ((s = auth_getvalue(as, "errormsg")) != NULL)
	log_error(NO_EXIT|NO_MAIL, "%s\n", s);
    return(AUTH_FAILURE);
}

int
bsdauth_cleanup(pw, auth)
    struct passwd *pw;
    sudo_auth *auth;
{
    auth_session_t *as = (auth_session_t *) auth->data;

    auth_close(as);

    return(AUTH_SUCCESS);
}