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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <crypt.h>
#include <pwd.h>
#include <shadow.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include "../../libpam/pam_impl.h"
#include <libintl.h>
/*
* Various useful files and string constants
*/
#define DIAL_FILE "/etc/dialups"
#define DPASS_FILE "/etc/d_passwd"
#define SHELL "/usr/bin/sh"
#define SCPYN(a, b) (void) strncpy(a, b, sizeof (a))
/*
* pam_sm_authenticate - This is the top level function in the
* module called by pam_auth_port in the framework
* Returns: PAM_AUTH_ERR on failure, 0 on success
*/
/*ARGSUSED*/
int
pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
char *ttyn, *user;
FILE *fp;
char defpass[30];
char line[80];
char *p1 = NULL, *p2 = NULL;
struct passwd pwd;
char pwd_buffer[1024];
char *password = NULL;
int retcode;
int i;
int debug = 0;
int res;
for (i = 0; i < argc; i++) {
if (strcasecmp(argv[i], "debug") == 0)
debug = 1;
else
syslog(LOG_DEBUG, "illegal option %s", argv[i]);
}
if ((retcode = pam_get_user(pamh, &user, NULL))
!= PAM_SUCCESS ||
(retcode = pam_get_item(pamh, PAM_TTY, (void **)&ttyn))
!= PAM_SUCCESS)
return (retcode);
if (debug) {
syslog(LOG_DEBUG,
"Dialpass authenticate user = %s, ttyn = %s",
user ? user : "NULL", ttyn ? ttyn : "NULL");
}
if (ttyn == NULL || *ttyn == '\0') {
char *service;
(void) pam_get_item(pamh, PAM_SERVICE, (void **)&service);
syslog(LOG_ERR, "pam_dial_auth: terminal-device not specified"
"by %s, returning %s.", service,
pam_strerror(pamh, PAM_SERVICE_ERR));
return (PAM_SERVICE_ERR);
}
if (getpwnam_r(user, &pwd, pwd_buffer, sizeof (pwd_buffer)) == NULL)
return (PAM_USER_UNKNOWN);
if ((fp = fopen(DIAL_FILE, "rF")) == NULL)
return (PAM_IGNORE);
while ((p1 = fgets(line, sizeof (line), fp)) != NULL) {
while (*p1 != '\n' && *p1 != ' ' && *p1 != '\t')
p1++;
*p1 = '\0';
if (strcmp(line, ttyn) == 0)
break;
}
(void) fclose(fp);
if ((fp = fopen(DPASS_FILE, "rF")) == NULL) {
syslog(LOG_ERR, "pam_dial_auth: %s without %s, returning %s.",
DIAL_FILE, DPASS_FILE,
pam_strerror(pamh, PAM_SYSTEM_ERR));
(void) memset(line, 0, sizeof (line));
return (PAM_SYSTEM_ERR);
}
if (p1 == NULL) {
(void) fclose(fp);
(void) memset(line, 0, sizeof (line));
return (PAM_IGNORE);
}
defpass[0] = '\0';
while ((p1 = fgets(line, sizeof (line)-1, fp)) != NULL) {
while (*p1 && *p1 != ':')
p1++;
*p1++ = '\0';
p2 = p1;
while (*p1 && *p1 != ':')
p1++;
*p1 = '\0';
if (pwd.pw_shell != NULL && strcmp(pwd.pw_shell, line) == 0)
break;
if (strcmp(SHELL, line) == 0)
SCPYN(defpass, p2);
p2 = NULL;
}
(void) memset(line, 0, sizeof (line));
(void) fclose(fp);
if (p2 == NULL)
p2 = defpass;
if (*p2 != '\0') {
res = __pam_get_authtok(pamh, PAM_PROMPT, PAM_AUTHTOK,
dgettext(TEXT_DOMAIN, "Dialup Password: "), &password);
if (res != PAM_SUCCESS) {
return (res);
}
if (strcmp(crypt(password, p2), p2) != 0) {
(void) memset(password, 0, strlen(password));
free(password);
return (PAM_AUTH_ERR);
}
(void) memset(password, 0, strlen(password));
free(password);
}
return (PAM_SUCCESS);
}
/*
* dummy pam_sm_setcred - does nothing
*/
/*ARGSUSED*/
int
pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
return (PAM_IGNORE);
}
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