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radlogin.c
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radlogin.c
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/*
* radlogin.c RADIUS based /bin/login replacement
*
* Version: $Id: radlogin.c,v 1.9 2008/01/09 07:04:18 sobomax Exp $
*
* Copyright (C) 1995,1996 Lars Fenneberg
* Copyright (C) 2007 The FreeRADIUS Project
*
* See the file COPYRIGHT for the respective terms and conditions.
*
*/
static char rcsid[] =
"$Id: radlogin.c,v 1.9 2008/01/09 07:04:18 sobomax Exp $";
#include <config.h>
#include <includes.h>
#include <freeradius-client.h>
#include <messages.h>
#include <pathnames.h>
#include <radlogin.h>
ENV *env = NULL;
static char *pname = NULL;
static rc_handle *rh = NULL;
static RETSIGTYPE
alarm_handler(int sn)
{
fprintf(stderr, SC_TIMEOUT, rc_conf_int(rh, "login_timeout"));
sleep(1);
exit(ERROR_RC);
}
static int
login_allowed(char *tty)
{
FILE *fp;
char fname[PATH_MAX];
int c;
strcpy(fname, rc_conf_str(rh, "nologin"));
if (access(fname, F_OK) < 0) {
if (tty) {
snprintf(fname, sizeof(fname), "%s.%s", rc_conf_str(rh, "nologin"), tty);
if (access(fname, F_OK) < 0)
return 1;
} else {
return 1;
}
}
if ((fp = fopen(fname, "r")) != NULL)
{
while ((c = fgetc(fp)) != EOF)
{
if (c == '\n')
fputc('\r', stdout);
fputc(c, stdout);
}
fflush(stdout);
fclose(fp);
} else {
printf(SC_NOLOGIN);
}
return 0;
}
static char *
subst_placeholders(char *str, char *tty)
{
char *p,*q;
static char buf[4096];
#if defined(HAVE_UNAME)
struct utsname uts;
#endif
#if !defined(HAVE_STRUCT_UTSNAME_DOMAINNAME) && defined(HAVE_GETDOMAINNAME)
char domainname[256];
#endif
#if defined(HAVE_UNAME)
uname(&uts);
#endif
p = str;
q = buf;
while (*p != '\0') {
switch (*p) {
case '\\':
if (*(p+1) == '\0')
break;
p++;
switch (*p) {
case 'I':
strcpy(q, rcsid);
q += strlen(rcsid);
break;
case 'L':
case 'P':
strcpy(q, tty);
q += strlen(tty);
break;
#if defined(HAVE_UNAME)
case 'S':
strcpy(q, uts.sysname);
q += strlen(uts.sysname);
break;
case 'N':
strcpy(q, uts.nodename);
q += strlen(uts.nodename);
break;
case 'R':
strcpy(q, uts.release);
q += strlen(uts.release);
break;
case 'V':
strcpy(q, uts.version);
q += strlen(uts.version);
break;
case 'M':
strcpy(q, uts.machine);
q += strlen(uts.machine);
break;
#endif
case 'D':
#if defined(HAVE_STRUCT_UTSNAME_DOMAINNAME)
strcpy(q, uts.domainname);
q += strlen(uts.domainname);
#elif defined(HAVE_GETDOMAINNAME)
getdomainname(domainname, sizeof(domainname));
strcpy(q, domainname);
q += strlen(domainname);
#endif
break;
case '\\':
*q = '\\';
q++;
break;
}
break;
#if defined(HAVE_UNAME)
case '@':
strcpy(q, uts.nodename);
q += strlen(uts.nodename);
break;
#endif
case '\n':
strcpy(q,"\r\n");
q += 2;
break;
default:
*q = *p;
q++;
break;
}
p++;
}
*q = '\0';
return buf;
}
static void
usage(void)
{
fprintf(stderr,"Usage: %s [-Vhnd] [-f <config_file>] [-i <client_port>] [-m <login_tries>]\n\n", pname);
fprintf(stderr," -V output version information\n");
fprintf(stderr," -h output this text\n");
fprintf(stderr," -n don't display issue file\n");
fprintf(stderr," -f filename of alternate config file\n");
fprintf(stderr," -i ttyname to send to the server\n");
fprintf(stderr," -m maximum login tries (overrides value in config file)\n");
exit(ERROR_RC);
}
static void
version(void)
{
fprintf(stderr,"%s: %s\n", pname ,rcsid);
exit(ERROR_RC);
}
int
main (int argc, char **argv)
{
char username[128];
char passwd[AUTH_PASS_LEN + 1];
int tries, remaining, c;
uint32_t client_port;
void (*login_func)(rc_handle *, char *);
FILE *fp;
char buf[4096];
char tty[1024], *p;
int noissue = 0;
int maxtries = 0;
char *ttyn = NULL;
char *path_radiusclient_conf = RC_CONFIG_FILE;
extern char *optarg;
extern int optind;
pname = (pname = strrchr(argv[0],'/'))?pname+1:argv[0];
rc_openlog(pname);
while ((c = getopt(argc,argv,"f:m:i:nhV")) > 0)
{
switch(c) {
case 'f':
path_radiusclient_conf = optarg;
break;
case 'i':
ttyn = optarg;
break;
case 'n':
noissue = 1;
break;
case 'm':
maxtries = atoi(optarg);
break;
case 'V':
version();
break;
case 'h':
usage();
break;
default:
exit(ERROR_RC);
break;
}
}
if ((rh = rc_read_config(path_radiusclient_conf)) == NULL)
exit(ERROR_RC);
if (rc_read_dictionary(rh, rc_conf_str(rh, "dictionary")) != 0)
exit (ERROR_RC);
if (rc_read_mapfile(rh, rc_conf_str(rh, "mapfile")) != 0)
exit (ERROR_RC);
if (ttyn != NULL)
{
client_port = rc_map2id(rh, ttyn);
if ((p = strrchr(ttyn, '/')) == NULL)
strncpy(tty, ttyn, sizeof(tty));
else
strncpy(tty, p+1, sizeof(tty));
}
else
{
ttyn = ttyname(0);
if (ttyn)
{
if ((p = strrchr(ttyn, '/')) == NULL)
strncpy(tty, ttyn, sizeof(tty));
else
strncpy(tty, p+1, sizeof(tty));
client_port = rc_map2id(rh, ttyn);
}
else
{
*tty = '\0';
client_port = 0;
}
}
#ifdef SETVBUF_REVERSED
setvbuf(stdout, _IONBF, NULL, 0);
#else
setvbuf(stdout, NULL, _IONBF, 0);
#endif
if ((argc - optind) == 1)
{
strncpy(username,argv[optind], sizeof(username));
}
else
{
*username = '\0';
if (!noissue) {
if (rc_conf_str(rh, "issue") && ((fp = fopen(rc_conf_str(rh, "issue"), "r")) != NULL))
{
while (fgets(buf, sizeof(buf), fp) != NULL)
fputs(subst_placeholders(buf, tty), stdout);
fflush(stdout);
fclose(fp);
} else {
fputs(subst_placeholders(SC_DEFAULT_ISSUE, tty), stdout);
fflush(stdout);
}
}
}
if ((env = rc_new_env(ENV_SIZE)) == NULL)
{
rc_log(LOG_CRIT, "rc_new_env: FATAL: out of memory");
abort();
}
#ifdef SECURITY_DISABLED
if (rc_import_env(env,environ) < 0)
{
rc_log(LOG_CRIT, "rc_import_env: FATAL: not enough space for environment (increase ENV_SIZE)");
abort();
}
#else
rc_add_env(env, "IFS", " ");
rc_add_env(env, "PATH", RC_SECURE_PATH);
#endif
signal(SIGALRM, alarm_handler);
remaining = rc_conf_int(rh, "login_timeout");
if (!maxtries)
maxtries = rc_conf_int(rh, "login_tries");
tries = 1;
while (tries <= maxtries)
{
alarm(remaining);
while (!*username) {
p = rc_getstr (rh, SC_LOGIN, 1);
if (p)
strncpy(username, p, sizeof(username));
else
exit (ERROR_RC);
}
p = rc_getstr(rh, SC_PASSWORD,0);
if (p)
strncpy (passwd, p, sizeof (passwd));
else
exit (ERROR_RC);
remaining = alarm(0);
login_func = NULL;
if (rc_conf_int(rh, "auth_order") & AUTH_LOCAL_FST)
{
login_func = auth_local(username, passwd);
if (!login_func)
if (rc_conf_int(rh, "auth_order") & AUTH_RADIUS_SND)
login_func = auth_radius(rh, client_port, username, passwd);
}
else
{
login_func = auth_radius(rh, client_port, username, passwd);
if (!login_func)
if (rc_conf_int(rh, "auth_order") & AUTH_LOCAL_SND)
login_func = auth_local(username, passwd);
}
memset(passwd, '\0', sizeof(passwd));
if (login_func != NULL) {
if (login_allowed(tty)) {
(*login_func)(rh, username);
} else {
sleep(1);
exit (ERROR_RC);
}
}
*username = '\0';
if ((++tries) <= maxtries) {
alarm(remaining);
sleep(tries * 2);
remaining = alarm(0);
}
}
fprintf(stderr, SC_EXCEEDED);
sleep(1);
exit (ERROR_RC);
}