isdn4k-utils/ipppd/radius.c

952 lines
20 KiB
C

/*
* $Id$
*
* Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
* Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
*
*/
#include <syslog.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/ip_fw.h>
#include <radiusclient.h>
#include <ctype.h>
#include "ipppd.h"
#include "fsm.h"
#include "lcp.h"
#include "upap.h"
#include "chap.h"
#include "ipcp.h"
#include "ccp.h"
#include "pathnames.h"
char *ip_ntoa __P((u_int32_t));
int bad_ip_adrs __P((u_int32_t));
char username_realm[255];
char radius_user[MAXNAMELEN];
char *make_username_realm ( char * );
static int client_port;
int called_radius_init = 0;
int auth_order = 0 ;
u_int32_t default_hisaddr = 0 ;
u_int32_t default_ouraddr = 0 ;
u_int32_t default_netmask = 0 ;
extern int idle_time_limit ;
extern int session_time_limit ;
void RestartIdleTimer __P((fsm *));
void RestartSessionTimer __P((fsm *));
struct ifstats
{
long rx_bytes;
long rx_packets;
long tx_bytes;
long tx_packets;
};
/***************************************************************************
*
* Name: radius_init
*
* Purpose: Initializing radiusclient
*
***************************************************************************/
int radius_init()
{
static char *func = "radius_init" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
if (rc_read_config (PATH_RADIUSCLIENT_CONF) != 0)
{
syslog(LOG_ERR, "can't load config file %s in %s",
PATH_RADIUSCLIENT_CONF, func ) ;
return (-1) ;
} ;
if (rc_read_dictionary (rc_conf_str ("dictionary")) != 0)
{
syslog(LOG_ERR , "can't load dictionary file %s in %s" ,
rc_conf_str ("dictionary") , func ) ;
return (-1);
} ;
if (rc_read_mapfile (rc_conf_str ("mapfile")) != 0)
{
syslog(LOG_ERR , "can't load map file %s in %s" ,
rc_conf_str ("mapfile") , func ) ;
return (-1);
} ;
called_radius_init = 1;
return 0;
}
/***************************************************************************
*
* Name: setparams
*
* Purpose: Set's up pppd parameters as received from RADIUS server
*
***************************************************************************/
static int radius_setparams(unit,vp)
int unit;
VALUE_PAIR *vp;
{
fsm *f = &lcp_fsm[unit];
ipcp_options *wo = &ipcp_wantoptions[unit];
u_int32_t remote = 0;
static char *func = "radius_setparams" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
/*
* service type (if not framed then quit),
* new IP address (RADIUS can define static IP for some users),
* new netmask (RADIUS can define netmask),
* idle time limit ( RADIUS can define idle timeout),
* session time limit ( RADIUS can limit session time ),
*/
while (vp)
{
switch (vp->attribute)
{
case PW_SERVICE_TYPE:
/* check for service type */
/* if not FRAMED then exit */
if (vp->lvalue != PW_FRAMED)
{
syslog (LOG_NOTICE,
"RADIUS wrong service type %ld for %s",
vp->lvalue, radius_user );
return (-1);
}
break;
case PW_FRAMED_PROTOCOL:
/* check for framed protocol type */
/* if not PPP then also exit */
if (vp->lvalue != PW_PPP)
{
syslog (LOG_NOTICE,
"RADIUS wrong framed protocol %ld for %s)",
vp->lvalue, radius_user );
return (-1);
}
break;
case PW_FRAMED_IP_ADDRESS:
/* seting up static IP addresses */
/* 0xfffffffe means NAS should select an ip address */
/* 0xffffffff means user should be allowed to select one */
/* the last case probably needs special handling ??? */
remote = vp->lvalue;
if ((remote != 0xfffffffe) && (remote != 0xffffffff))
{
remote = htonl(remote);
if (bad_ip_adrs (remote))
{
syslog (LOG_ERR,
"RADIUS bad remote IP address %s for %s in %s",
ip_ntoa (remote),
radius_user,
func );
return (-1);
}
wo->hisaddr = remote;
syslog (LOG_DEBUG,
"Assigned remote static IP %s in %s",
ip_ntoa (remote), func ) ;
}
break;
case PW_FRAMED_IP_NETMASK:
/* changing netmask has some problems too */
/* Boy have I looked when I was changed */
/* server's config for USR/TC and none of my */
/* linux TS didn't work any more :( */
netmask = htonl (vp->lvalue);
syslog (LOG_DEBUG,
"Assigned netmask %s in %s",
ip_ntoa (netmask), func ) ;
break;
case PW_FRAMED_MTU:
/* Don't know if this is OK but what the hack */
/* anyone using this succesfully ? */
lcp_allowoptions[unit].mru = vp->lvalue;
syslog (LOG_DEBUG,
"Assigned mtu %ld in %s" ,
vp->lvalue , func ) ;
break;
case PW_IDLE_TIMEOUT:
/* This one is operational */
/* have using it for some time */
idle_time_limit = vp->lvalue;
if (idle_time_limit != 0)
{
RestartIdleTimer ( f );
syslog (LOG_DEBUG,
"Assigned idle timeout %ld in %s" ,
vp->lvalue , func ) ;
}
break;
case PW_SESSION_TIMEOUT:
/* This one works also for me */
session_time_limit = vp->lvalue;
if ( session_time_limit != 0 )
{
RestartSessionTimer ( f );
syslog (LOG_DEBUG,
"assigned session timeout %ld in %s" ,
session_time_limit, func ) ;
}
break;
case PW_FILTER_ID:
/* Idea for future implementation */
/* if we get the name of the filter */
/* we can run ipfwadm based script */
/* and have one new functione as the */
/* big boys have. Any volunteers ? */
/* I would look at ip-up imeplementation*/
/* and copied it here */
syslog (LOG_NOTICE,
"Dynamic filtering not implemented yet in %s",
func );
break;
case PW_FRAMED_ROUTING:
/* Idea for future implementation */
/* Have no idea how to implement */
/* for those who runs gated routing */
/* would go by default if i'm not wrong */
syslog (LOG_NOTICE,
"Dynamic routing setup not implemented yet in %s",
func );
break;
}
vp = vp->next;
}
return 0;
}
#ifdef RADIUS_WTMP_LOGGING
/***************************************************************************
*
* Name: radius_wtmp_logging
*
* Purpose: write user into wtmp database
*
***************************************************************************/
static void
radius_wtmp_logging(user,unit)
char *user;
int unit ;
{
char *tty;
static char *func = "radius_wtmp_logging" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
syslog(LOG_DEBUG, "user %s logged in", user);
tty = lns[unit].devnam;
if (strncmp(tty, "/dev/", 5) == 0)
{
tty += 5;
}
logwtmputmp(unit, tty, radius_user, "");
lns[unit].logged_in = TRUE;
}
#endif
/***************************************************************************
*
* Name: radius_buildenv
*
* Purpose:
*
***************************************************************************/
int
radius_buildenv(vp)
VALUE_PAIR *vp ;
{
char name[2048] ;
char value[2048]; /* more than enough */
char *p;
int acount[256];
int attr;
script_setenv("RADIUS_USER_NAME", radius_user);
while (vp)
{
strcpy(name, "RADIUS_");
if (rc_avpair_tostr(vp, name+7, sizeof(name)-7, value,
sizeof(value)) < 0)
{
return 1;
}
/* Translate "-" => "_" and uppercase*/
for(p = name; *p; p++)
{
*p = toupper(*p);
if (*p == '-') *p = '_';
}
/* Add to the attribute count and append the var if necessary. */
if ((attr = vp->attribute) < 256)
{
int count;
if ((count = acount[attr]++) > 0)
{
char buf[10];
sprintf(buf, "_%d", count);
strcat(name,buf);
}
}
script_setenv(name, value);
vp = vp->next;
}
return 0;
}
/****************************************************************************
*
* Name: radius_pap_auth
*
* Purpose: Check the user name and password against RADIUS server
* and add accounting start record of the user if OK.
*
* Returns: UPAP_AUTHNAK: Login failed.
* UPAP_AUTHACK: Login succeeded.
*
****************************************************************************/
int
radius_pap_auth (unit, user, passwd, msg, msglen )
int unit ;
char *user;
char *passwd;
char **msg;
int *msglen;
{
VALUE_PAIR *send ;
VALUE_PAIR *received;
UINT4 av_type;
static char radius_msg[4096];
int result;
static char *func = "radius_pap_auth" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
send = NULL ;
received = NULL;
client_port = rc_map2id (lns[unit].devnam);
av_type = PW_FRAMED;
rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0);
av_type = PW_PPP;
rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0);
strncpy ( radius_user , make_username_realm ( user ) ,
sizeof (radius_user));
rc_avpair_add (&send, PW_USER_NAME, radius_user , 0);
rc_avpair_add (&send, PW_USER_PASSWORD, passwd, 0);
result = rc_auth (client_port, send, &received, radius_msg);
if (result == OK_RC)
{
if (radius_setparams(unit,received) < 0)
{
syslog (LOG_ERR,"Error setting params in %s" ,
func );
result = ERROR_RC;
}
else
{
/* Build the environment for ip-up and ip-down */
script_unsetenv_prefix("RADIUS_");
radius_buildenv(received);
}
}
else
{
syslog (LOG_ERR,"Error sending auth request in %s" , func );
}
rc_avpair_free(received);
rc_avpair_free (send);
*msg = radius_msg;
*msglen = strlen(radius_msg);
#ifdef RADIUS_WTMP_LOGGING
if (result == OK_RC)
{
radius_wtmp_logging(user,unit);
}
#endif
return (result == OK_RC)?UPAP_AUTHACK:UPAP_AUTHNAK;
}
/***************************************************************************
*
* Name: radius_chap_auth
*
* Purpose: CHAP authentication with RADIUS server
*
***************************************************************************/
int
radius_chap_auth (unit,user, remmd, cstate )
int unit ;
char *user;
u_char *remmd;
chap_state *cstate;
{
VALUE_PAIR *send;
VALUE_PAIR *received;
UINT4 av_type;
static char radius_msg[4096];
int result;
u_char cpassword[MD5_SIGNATURE_SIZE+1];
static char *func = "radius_chap_auth" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
/* we handle md5 digest at the moment */
if (cstate->chal_type != CHAP_DIGEST_MD5)
{
syslog(LOG_ERR, "Challenge type not MD5 in %s", func ) ;
return(-1);
}
send = received = NULL;
client_port = rc_map2id (lns[unit].devnam);
av_type = PW_FRAMED;
rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0);
av_type = PW_PPP;
rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0);
rc_avpair_add (&send, PW_USER_NAME, radius_user , 0);
/*
* add the CHAP-Password and CHAP-Challenge fields
*/
cpassword[0] = cstate->chal_id;
memcpy(&cpassword[1], remmd, MD5_SIGNATURE_SIZE);
rc_avpair_add(&send, PW_CHAP_PASSWORD, cpassword, MD5_SIGNATURE_SIZE + 1);
rc_avpair_add(&send, PW_CHAP_CHALLENGE, cstate->challenge, cstate->chal_len);
result = rc_auth (client_port, send, &received, radius_msg);
if (result == OK_RC)
{
if (radius_setparams(unit,received) < 0)
{
syslog (LOG_ERR,"Error setting params in %s" ,
func );
result = ERROR_RC;
}
}
else
{
syslog (LOG_ERR,"Error sending auth request in %s" , func );
}
rc_avpair_free(received);
rc_avpair_free (send);
#ifdef RADIUS_WTMP_LOGGING
if (result == OK_RC)
{
radius_wtmp_logging(user,unit);
}
#endif
return (result == OK_RC)?0:(-1);
}
/***************************************************************************
*
* Name: if_getipacct
*
* Purpose: reads ip accounting information
*
***************************************************************************/
static void
if_getipacct(ifname, ifs)
char *ifname ;
struct ifstats *ifs ;
{
FILE* f = fopen("/proc/net/ip_acct","r");
char buf[256];
char acctif[128];
long dummy;
long direction;
long packets;
long bytes;
int rc;
static char *func = "if_getipacct" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
if (!f)
{
syslog(LOG_ERR, "Can't open /proc/net/ip_acct in %s:" ,
func ) ;
return;
}
fgets(buf, sizeof(buf), f);
acctif[0] = '\0';
while (1)
{
rc = fscanf(f, "%ld/%ld->%ld/%ld %s %ld %ld %ld %ld %ld %ld",
&dummy,&dummy,&dummy,&dummy,acctif,&dummy,
&direction, &dummy, &dummy, &packets, &bytes);
fgets(buf, sizeof(buf), f);
if (rc == EOF)
{
break;
}
if (rc != 11)
{
break;
}
if (strcmp(ifname, acctif) == 0)
{
syslog(LOG_DEBUG, "Interface <%s> found in %s",
acctif, func ) ;
if (direction == 1000) /* incoming bytes */
{
syslog(LOG_DEBUG,
"Incoming bytes/packets = %ld/%ld in %s",
bytes, packets, func ) ;
ifs->rx_bytes = bytes;
ifs->rx_packets = packets;
}
else
{
syslog(LOG_DEBUG,
"Outgoing bytes/packets = %ld/%ld in %s",
bytes, packets, func ) ;
ifs->tx_bytes = bytes;
ifs->tx_packets = packets;
}
}
}
fclose(f);
}
/***************************************************************************
*
* Name: radius_ip_acct_on
*
* Purpose: set up ip accounting rules for this interface
*
***************************************************************************/
static int
radius_ip_acct_on ( unit )
int unit ;
{
static int sockfd = -1;
int ret;
struct ip_fw ip_acct ;
static char *func = "radius_ip_acct_on" ;
syslog ( LOG_DEBUG , "%s: entered" , func ) ;
memset ( &ip_acct , 0x0 , sizeof ( ip_acct ) ) ;
strncpy ( ip_acct.fw_vianame , lns[unit].ifname, IFNAMSIZ ) ;
ip_acct.fw_flg |= IP_FW_F_ACCTIN ;
if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)
{
syslog ( LOG_ERR , "ipfwadm: socket creation failed in %s",
func );
return (-1);
}
ret = setsockopt( sockfd, IPPROTO_IP, IP_ACCT_INSERT, &ip_acct ,
sizeof ( ip_acct) );
close ( sockfd ) ;
if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)
{
syslog ( LOG_ERR , "ipfwadm: socket creation failed in %s",
func );
return (-1);
}
ip_acct.fw_flg &= ~IP_FW_F_ACCTIN ;
ip_acct.fw_flg |= IP_FW_F_ACCTOUT ;
ret = setsockopt( sockfd, IPPROTO_IP, IP_ACCT_INSERT, &ip_acct ,
sizeof ( ip_acct) );
close ( sockfd ) ;
return ret;
};
/***************************************************************************
*
* Name: radius_ip_acct_off
*
* Purpose: destroy ip accounting rules for this interface
*
***************************************************************************/
static int
radius_ip_acct_off ( unit )
int unit ;
{
static int sockfd = -1;
int ret;
struct ip_fw ip_acct ;
static char *func = "radius_ip_acct_on" ;
syslog ( LOG_DEBUG , "%s: entered" , func ) ;
memset ( &ip_acct , 0x0 , sizeof ( ip_acct ) ) ;
strncpy ( ip_acct.fw_vianame , lns[unit].ifname, IFNAMSIZ ) ;
ip_acct.fw_flg |= IP_FW_F_ACCTIN ;
if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)
{
syslog ( LOG_ERR , "ipfwadm: socket creation failed in %s",
func );
return (-1);
}
ret = setsockopt( sockfd, IPPROTO_IP, IP_ACCT_DELETE, &ip_acct ,
sizeof ( ip_acct) );
close ( sockfd ) ;
if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)
{
syslog ( LOG_ERR , "ipfwadm: socket creation failed in %s",
func );
return (-1);
}
ip_acct.fw_flg &= ~IP_FW_F_ACCTIN ;
ip_acct.fw_flg |= IP_FW_F_ACCTOUT ;
ret = setsockopt( sockfd, IPPROTO_IP, IP_ACCT_DELETE, &ip_acct ,
sizeof ( ip_acct) );
close ( sockfd ) ;
return ret;
};
/***************************************************************************
*
* Name: radius_acct_start
*
* Purpose: send acct start message to RADIUS server
*
***************************************************************************/
int
radius_acct_start(unit)
int unit ;
{
UINT4 av_type;
int result;
VALUE_PAIR *send = NULL;
ipcp_options *ho = &ipcp_hisoptions[unit];
u_int32_t hisaddr ;
static char *func = "radius_acct_start" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
client_port = rc_map2id (lns[unit].devnam);
lns[unit].start_time = time (NULL);
radius_ip_acct_on ( unit ) ;
strncpy (lns[unit].session_id, rc_mksid (),
sizeof (lns[unit].session_id) );
rc_avpair_add (&send, PW_ACCT_SESSION_ID, lns[unit].session_id, 0);
rc_avpair_add (&send, PW_USER_NAME, radius_user, 0);
av_type = PW_STATUS_START;
rc_avpair_add (&send, PW_ACCT_STATUS_TYPE, &av_type, 0);
av_type = PW_FRAMED;
rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0);
av_type = PW_PPP;
rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0);
av_type = PW_RADIUS;
rc_avpair_add (&send, PW_ACCT_AUTHENTIC, &av_type, 0);
rc_avpair_add (&send, PW_CALLING_STATION_ID, lns[unit].remote_number, 0);
av_type = PW_ISDN_SYNC ;
rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0);
hisaddr = ho->hisaddr;
av_type = htonl(hisaddr) ;
rc_avpair_add (&send, PW_FRAMED_IP_ADDRESS , &av_type , 0 ) ;
result = rc_acct (client_port, send);
rc_avpair_free(send);
if (result != OK_RC)
{
/* RADIUS server could be down so make this a warning */
syslog (LOG_WARNING,
"Accounting START failed for %s in %s",
radius_user,func );
}
else
{
lns[unit].radius_in = TRUE;
#ifdef RADIUS_WTMP_LOGGING
if ( lns[unit].logged_in == FALSE )
radius_wtmp_logging(user,unit);
#endif
}
return ( result ) ;
}
/***************************************************************************
*
* Name: radius_acct_stop
*
* Purpose: send acct stop message to RADIUS server
*
***************************************************************************/
int
radius_acct_stop (unit)
int unit ;
{
UINT4 av_type;
int result;
VALUE_PAIR *send = NULL;
struct ifstats ifstats;
ipcp_options *ho = &ipcp_hisoptions[unit];
u_int32_t hisaddr ;
static char *func = "radius_acct_stop" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
memset ( &ifstats , 0x0 , sizeof ( ifstats )) ;
if_getipacct(lns[unit].ifname, &ifstats);
radius_ip_acct_off ( unit ) ;
rc_avpair_add (&send, PW_ACCT_SESSION_ID, lns[unit].session_id, 0);
rc_avpair_add (&send, PW_USER_NAME, radius_user, 0);
av_type = PW_STATUS_STOP;
rc_avpair_add (&send, PW_ACCT_STATUS_TYPE, &av_type, 0);
av_type = PW_FRAMED;
rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0);
av_type = PW_PPP;
rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0);
av_type = PW_RADIUS;
rc_avpair_add (&send, PW_ACCT_AUTHENTIC, &av_type, 0);
av_type = time (NULL) - lns[unit].start_time;
rc_avpair_add (&send, PW_ACCT_SESSION_TIME, &av_type, 0);
av_type = ifstats.tx_bytes ;
rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0);
av_type = ifstats.rx_bytes ;
rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0);
av_type = ifstats.tx_packets ;
rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0);
av_type = ifstats.rx_packets ;
rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0);
rc_avpair_add (&send, PW_CALLING_STATION_ID, lns[unit].remote_number, 0);
av_type = PW_ISDN_SYNC ;
rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0);
hisaddr = ho->hisaddr;
av_type = htonl(hisaddr) ;
rc_avpair_add (&send, PW_FRAMED_IP_ADDRESS , &av_type , 0 ) ;
result = rc_acct (client_port, send);
rc_avpair_free(send);
if (result != OK_RC)
{
syslog(LOG_ERR,
"Accounting STOP failed for %s in %s",
radius_user, func);
}
lns[unit].radius_in = FALSE;
return ( result ) ;
}
/***************************************************************************
*
* Name: make_username_realm
*
* Purpose: makes username_realm from user
*
***************************************************************************/
char
*make_username_realm ( user )
char *user ;
{
char *default_realm;
static char *func = "radius_acct_stop" ;
syslog(LOG_DEBUG, "%s: entered", func ) ;
if ( user != NULL )
{
strncpy (username_realm, user,sizeof (username_realm));
}
else
{
strncpy (username_realm, "\0" , sizeof (username_realm));
}
default_realm = rc_conf_str ("default_realm");
if ( (strchr (username_realm, '@') == NULL) &&
default_realm &&
(*default_realm != '\0'))
{
strncat (username_realm, "@",
sizeof (username_realm));
strncat (username_realm, default_realm,
sizeof (username_realm));
}
return ( username_realm ) ;
}