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/*
* Copyright (c) 1999-2002 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 <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <auth.h>
#include <firewall.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
static const char rcsid[] = "$Sudo: fwtk.c,v 1.17 2003/03/15 20:37:44 millert Exp $";
#endif /* lint */
int
fwtk_init(pw, promptp, auth)
struct passwd *pw;
char **promptp;
sudo_auth *auth;
{
static Cfg *confp; /* Configuration entry struct */
char resp[128]; /* Response from the server */
if ((confp = cfg_read("sudo")) == (Cfg *)-1) {
(void) fprintf(stderr, "%s: cannot read fwtk config.\n", Argv[0]);
return(AUTH_FATAL);
}
if (auth_open(confp)) {
(void) fprintf(stderr, "%s: cannot connect to authentication server.\n",
Argv[0]);
return(AUTH_FATAL);
}
/* Get welcome message from auth server */
if (auth_recv(resp, sizeof(resp))) {
(void) fprintf(stderr,
"%s: lost connection to authentication server.\n", Argv[0]);
return(AUTH_FATAL);
}
if (strncmp(resp, "Authsrv ready", 13) != 0) {
(void) fprintf(stderr,
"%s: authentication server error.\n%s\n", Argv[0], resp);
return(AUTH_FATAL);
}
return(AUTH_SUCCESS);
}
int
fwtk_verify(pw, prompt, auth)
struct passwd *pw;
char *prompt;
sudo_auth *auth;
{
volatile char *pass; /* Password from the user */
volatile char buf[SUDO_PASS_MAX + 12]; /* General prupose buffer */
char resp[128]; /* Response from the server */
int error;
extern int nil_pw;
/* Send username to authentication server. */
(void) snprintf(buf, sizeof(buf), "authorize %s 'sudo'", pw->pw_name);
if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
(void) fprintf(stderr,
"%s: lost connection to authentication server.\n", Argv[0]);
return(AUTH_FATAL);
}
/* Get the password/response from the user. */
if (strncmp(resp, "challenge ", 10) == 0) {
(void) snprintf(buf, sizeof(buf), "%s\nResponse: ", &resp[10]);
pass = tgetpass(buf, def_ival(I_PASSWD_TIMEOUT) * 60, tgetpass_flags);
if (pass && *pass == '\0') {
pass = tgetpass("Response [echo on]: ",
def_ival(I_PASSWD_TIMEOUT) * 60, tgetpass_flags | TGP_ECHO);
}
} else if (strncmp(resp, "password", 8) == 0) {
pass = tgetpass(prompt, def_ival(I_PASSWD_TIMEOUT) * 60,
tgetpass_flags);
} else {
(void) fprintf(stderr, "%s: %s\n", Argv[0], resp);
return(AUTH_FATAL);
}
if (!pass) { /* ^C or error */
nil_pw = 1;
return(AUTH_FAILURE);
} else if (*pass == '\0') /* empty password */
nil_pw = 1;
/* Send the user's response to the server */
(void) snprintf(buf, sizeof(buf), "response '%s'", pass);
if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
(void) fprintf(stderr,
"%s: lost connection to authentication server.\n", Argv[0]);
error = AUTH_FATAL;
goto done;
}
if (strncmp(resp, "ok", 2) == 0) {
error = AUTH_SUCCESS;
goto done;
}
/* Main loop prints "Permission Denied" or insult. */
if (strcmp(resp, "Permission Denied.") != 0)
fprintf(stderr, "%s: %s\n", Argv[0], resp);
error = AUTH_FAILURE;
done:
memset(pass, 0, strlen(pass));
memset(buf, 0, strlen(buf));
return(error);
}
int
fwtk_cleanup(pw, auth)
struct passwd *pw;
sudo_auth *auth;
{
auth_close();
return(AUTH_SUCCESS);
}
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