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/*
* Copyright (c) 1999 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 <security/pam_appl.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
static const char rcsid[] = "$Sudo: pam.c,v 1.14 2000/01/24 03:23:40 millert Exp $";
#endif /* lint */
static int sudo_conv __P((int, PAM_CONST struct pam_message **,
struct pam_response **, VOID *));
static char *def_prompt;
int
pam_init(pw, promptp, auth)
struct passwd *pw;
char **promptp;
sudo_auth *auth;
{
static struct pam_conv pam_conv;
pam_handle_t *pamh;
/* Initial PAM setup */
pam_conv.conv = sudo_conv;
if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
"unable to initialize PAM");
return(AUTH_FATAL);
}
auth->data = (VOID *) pamh;
return(AUTH_SUCCESS);
}
int
pam_verify(pw, prompt, auth)
struct passwd *pw;
char *prompt;
sudo_auth *auth;
{
int error;
const char *s;
pam_handle_t *pamh = (pam_handle_t *) auth->data;
def_prompt = prompt; /* for sudo_conv */
/* PAM_SILENT prevents error messages from going to syslog(3) */
if ((error = pam_authenticate(pamh, PAM_SILENT)) == PAM_SUCCESS)
return(AUTH_SUCCESS);
/* Any error other than PAM_AUTH_ERR or PAM_MAXTRIES is probably fatal. */
if (error != PAM_AUTH_ERR && error != PAM_MAXTRIES) {
if ((s = pam_strerror(pamh, error)))
log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s\n", s);
return(AUTH_FATAL);
}
return(AUTH_FAILURE);
}
int
pam_cleanup(pw, auth)
struct passwd *pw;
sudo_auth *auth;
{
pam_handle_t *pamh = (pam_handle_t *) auth->data;
if (pam_end(pamh, (auth->status == AUTH_SUCCESS)) == PAM_SUCCESS)
return(AUTH_SUCCESS);
else
return(AUTH_FAILURE);
}
/*
* ``Conversation function'' for PAM.
*/
static int
sudo_conv(num_msg, msg, response, appdata_ptr)
int num_msg;
PAM_CONST struct pam_message **msg;
struct pam_response **response;
VOID *appdata_ptr;
{
struct pam_response *pr;
PAM_CONST struct pam_message *pm;
const char *p = def_prompt;
int echo = 0;
extern int nil_pw;
if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
return(PAM_CONV_ERR);
(void) memset((VOID *)*response, 0, num_msg * sizeof(struct pam_response));
for (pr = *response, pm = *msg; num_msg--; pr++, pm++) {
switch (pm->msg_style) {
case PAM_PROMPT_ECHO_ON:
echo = 1;
case PAM_PROMPT_ECHO_OFF:
/* Only override PAM prompt if it matches /^Password: ?/ */
if (strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
&& (pm->msg[9] != ' ' || pm->msg[10] != '\0')))
p = pm->msg;
/* Read the password. */
pr->resp = estrdup((char *) tgetpass(p,
def_ival(I_PW_TIMEOUT) * 60, !echo));
if (*pr->resp == '\0')
nil_pw = 1; /* empty password */
break;
case PAM_TEXT_INFO:
if (pm->msg)
(void) puts(pm->msg);
break;
case PAM_ERROR_MSG:
if (pm->msg) {
(void) fputs(pm->msg, stderr);
(void) fputc('\n', stderr);
}
break;
default:
/* Something odd happened */
/* XXX - should free non-NULL response members */
free(*response);
*response = NULL;
return(PAM_CONV_ERR);
break;
}
}
return(PAM_SUCCESS);
}
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