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/*
* Copyright (c) 2000-2005, 2007-2008 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#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 <ctype.h>
#include <pwd.h>
#include <signal.h>
#include <login_cap.h>
#include <bsd_auth.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo: bsdauth.c,v 1.23 2008/11/09 14:13:13 millert Exp $";
#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);
}
if (auth_setitem(as, AUTHV_STYLE, login_style) < 0 ||
auth_setitem(as, AUTHV_NAME, pw->pw_name) < 0 ||
auth_setitem(as, AUTHV_CLASS, login_class) < 0) {
log_error(NO_EXIT|NO_MAIL, "unable to setup authentication");
auth_close(as);
return(AUTH_FATAL);
}
auth->data = (void *) as;
return(AUTH_SUCCESS);
}
int
bsdauth_verify(pw, prompt, auth)
struct passwd *pw;
char *prompt;
sudo_auth *auth;
{
char *pass;
char *s;
size_t len;
int authok = 0;
sigaction_t sa, osa;
auth_session_t *as = (auth_session_t *) auth->data;
/* save old signal handler */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
(void) sigaction(SIGCHLD, &sa, &osa);
/*
* If there is a challenge then print that instead of the normal
* prompt. If the user just hits return we prompt again with echo
* turned on, which is useful for challenge/response things like
* S/Key.
*/
if ((s = auth_challenge(as)) == NULL) {
pass = tgetpass(prompt, def_passwd_timeout * 60, tgetpass_flags);
} else {
pass = tgetpass(s, def_passwd_timeout * 60, tgetpass_flags);
if (pass && *pass == '\0') {
if ((prompt = strrchr(s, '\n')))
prompt++;
else
prompt = s;
/*
* Append '[echo on]' to the last line of the challenge and
* reprompt with echo turned on.
*/
len = strlen(prompt) - 1;
while (isspace(prompt[len]) || prompt[len] == ':')
prompt[len--] = '\0';
easprintf(&s, "%s [echo on]: ", prompt);
pass = tgetpass(s, def_passwd_timeout * 60,
tgetpass_flags | TGP_ECHO);
free(s);
}
}
if (pass) {
authok = auth_userresponse(as, pass, 1);
zero_bytes(pass, strlen(pass));
}
/* restore old signal handler */
(void) sigaction(SIGCHLD, &osa, NULL);
if (authok)
return(AUTH_SUCCESS);
if (!pass)
return(AUTH_INTR);
if ((s = auth_getvalue(as, "errormsg")) != NULL)
log_error(NO_EXIT|NO_MAIL, "%s", 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);
}
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