b43583c01d
- Change all strcpy() calls to strncpy() to avoid buffer overflow potential - Add ICMP host unreachable support - Logging to syslog if log_file = "syslog:facility" - Now requires libcli 1.5 - All configuration moves to a config structure - Ability to modify and write config on the fly through command-line interface - Config file support is removed, and now handled by the cli - Show hostname in cli prompt - Keep current state type for tunnels - Add uptime command do CLI, which also shows real-time bandwidth utilisation - Add goodbye command to cluster master, which forces droppping a slave - Cache IP address allocation, so that reconnecting users get the same address - Fix tunnel resend timeouts, so that dead tunnels will be cleaned up - Allocate tunnels and radius without using a linked list which had issues - Fix some off-by-one errors in tunnel and session and radius arrays - Save and reload ip address pool when dieing - Check version and size of reloaded data when restarting - Remove plugin_config support - Remove old support for TBF which didn't work anyway. HTB is required to do throttling now. - Add COPYING and Changes files
630 lines
16 KiB
C
630 lines
16 KiB
C
// L2TPNS Radius Stuff
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// $Id: radius.c,v 1.2 2004/03/05 00:09:03 fred_nerk Exp $
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#include <time.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <malloc.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <netinet/in.h>
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#include "md5.h"
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#include "constants.h"
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#include "l2tpns.h"
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#include "plugin.h"
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#include "util.h"
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extern radiust *radius;
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extern sessiont *session;
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extern tunnelt *tunnel;
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extern u32 sessionid;
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extern int radfd;
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extern struct Tstats *_statistics;
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extern struct configt *config;
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const char *radius_state(int state)
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{
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static char *tmp = NULL;
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int i;
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for (i = 0; radius_states[i]; i++)
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if (i == state) return radius_states[i];
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if (tmp == NULL) tmp = (char *)calloc(64, 1);
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sprintf(tmp, "%d", state);
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return tmp;
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}
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// Set up socket for radius requests
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void initrad(void)
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{
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radfd = socket(AF_INET, SOCK_DGRAM, UDP);
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}
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void radiusclear(u8 r, sessionidt s)
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{
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if (s) session[s].radius = 0;
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memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
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}
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static u8 new_radius()
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{
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u8 i;
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for (i = 1; i < MAXRADIUS; i++)
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{
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if (radius[i].state == RADIUSNULL)
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return i;
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}
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log(0, 0, 0, 0, "Can't find a free radius session! This could be bad!\n");
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return 0;
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}
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u8 radiusnew(sessionidt s)
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{
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u8 r;
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if (!(r = new_radius()))
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{
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log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n");
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STAT(radius_overflow);
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return 0;
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};
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memset(&radius[r], 0, sizeof(radius[r]));
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session[s].radius = r;
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radius[r].session = s;
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radius[r].state = RADIUSWAIT;
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return r;
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}
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// Send a RADIUS request
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void radiussend(u8 r, u8 state)
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{
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struct sockaddr_in addr;
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u8 b[4096]; // RADIUS packet
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char pass[129];
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int pl;
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u8 *p;
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sessionidt s;
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#ifdef STAT_CALLS
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STAT(call_radiussend);
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#endif
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s = radius[r].session;
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if (!config->numradiusservers)
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{
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log(0, 0, s, session[s].tunnel, "No RADIUS servers\n");
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return;
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}
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if (!*config->radiussecret)
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{
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log(0, 0, s, session[s].tunnel, "No RADIUS secret\n");
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return;
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}
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if (state != RADIUSAUTH && !config->radius_accounting)
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{
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// Radius accounting is turned off
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radiusclear(r, s);
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return;
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}
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if (radius[r].state != state)
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radius[r].try = 0;
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radius[r].state = state;
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radius[r].retry = backoff(radius[r].try++);
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log(4, 0, s, session[s].tunnel, "Send RADIUS %d state %s try %d\n", r, radius_state(radius[r].state), radius[r].try);
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if (radius[r].try > config->numradiusservers * 2)
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{
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if (s)
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{
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sessionshutdown(s, "RADIUS timeout");
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STAT(radius_timeout);
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}
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else
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{
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STAT(radius_retries);
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radius[r].state = RADIUSWAIT;
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radius[r].retry = 100;
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}
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return ;
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}
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// contruct RADIUS access request
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switch (state)
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{
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case RADIUSAUTH:
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b[0] = 1; // access request
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break;
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case RADIUSSTART:
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case RADIUSSTOP:
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b[0] = 4; // accounting request
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break;
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default:
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log(0, 0, 0, 0, "Unknown radius state %d\n", state);
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}
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b[1] = r; // identifier
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memcpy(b + 4, radius[r].auth, 16);
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p = b + 20;
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if (s)
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{
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*p = 1; // user name
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p[1] = strlen(session[s].user) + 2;
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strcpy(p + 2, session[s].user);
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p += p[1];
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}
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if (state == RADIUSAUTH)
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{
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if (radius[r].chap)
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{
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*p = 3; // CHAP password
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p[1] = 19; // length
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p[2] = radius[r].id; // ID
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memcpy(p + 3, radius[r].pass, 16); // response from CHAP request
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p += p[1];
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*p = 60; // CHAP Challenge
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p[1] = 18; // length
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memcpy(p + 2, radius[r].auth, 16);
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p += p[1];
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}
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else
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{
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strcpy(pass, radius[r].pass);
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pl = strlen(pass);
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while (pl & 15)
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pass[pl++] = 0; // pad
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if (pl)
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{ // encrypt
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hasht hash;
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int p = 0;
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while (p < pl)
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{
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MD5_CTX ctx;
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MD5Init(&ctx);
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MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
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if (p)
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MD5Update(&ctx, pass + p - 16, 16);
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else
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MD5Update(&ctx, radius[r].auth, 16);
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MD5Final(hash, &ctx);
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do
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{
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pass[p] ^= hash[p & 15];
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p++;
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}
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while (p & 15);
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}
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}
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*p = 2; // password
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p[1] = pl + 2;
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if (pl)
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memcpy(p + 2, pass, pl);
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p += p[1];
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}
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}
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else if (state == RADIUSSTART || state == RADIUSSTOP)
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{ // accounting
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*p = 40; // accounting type
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p[1] = 6;
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*(u32 *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
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p += p[1];
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if (s)
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{
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*p = 44; // session ID
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p[1] = 18;
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sprintf(p + 2, "%08X%08X", session[s].id, session[s].opened);
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p += p[1];
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if (state == RADIUSSTOP)
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{ // stop
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*p = 42; // input octets
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(session[s].cin);
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p += p[1];
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*p = 43; // output octets
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(session[s].cout);
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p += p[1];
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*p = 46; // session time
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
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p += p[1];
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*p = 47; // input packets
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(session[s].pin);
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p += p[1];
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*p = 48; // output spackets
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(session[s].pout);
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p += p[1];
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}
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else
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{ // start
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*p = 41; // delay
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
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p += p[1];
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}
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}
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}
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if (s)
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{
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*p = 5; // NAS-Port
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(s);
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p += p[1];
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}
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if (s && session[s].ip)
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{
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*p = 8; // Framed-IP-Address
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p[1] = 6;
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*(u32 *) (p + 2) = htonl(session[s].ip);
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p += p[1];
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}
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if (*session[s].called)
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{
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*p = 30; // called
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p[1] = strlen(session[s].called) + 2;
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strcpy(p + 2, session[s].called);
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p += p[1];
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}
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if (*radius[r].calling)
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{
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*p = 31; // calling
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p[1] = strlen(radius[r].calling) + 2;
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strcpy(p + 2, radius[r].calling);
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p += p[1];
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}
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else if (*session[s].calling)
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{
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*p = 31; // calling
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p[1] = strlen(session[s].calling) + 2;
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strcpy(p + 2, session[s].calling);
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p += p[1];
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}
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// NAS-IP-Address
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*p = 4;
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p[1] = 6;
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*(u32 *)(p + 2) = config->bind_address;
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p += p[1];
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// All AVpairs added
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*(u16 *) (b + 2) = htons(p - b);
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if (state != RADIUSAUTH)
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{
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// Build auth for accounting packet
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char z[16] = {0};
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char hash[16] = {0};
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MD5_CTX ctx;
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MD5Init(&ctx);
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MD5Update(&ctx, b, 4);
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MD5Update(&ctx, z, 16);
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MD5Update(&ctx, b + 20, (p - b) - 20);
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MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
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MD5Final(hash, &ctx);
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memcpy(b + 4, hash, 16);
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memcpy(radius[r].auth, hash, 16);
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}
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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*(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
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addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
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log_hex(5, "RADIUS Send", b, (p - b));
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sendto(radfd, b, p - b, 0, (void *) &addr, sizeof(addr));
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}
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// process RADIUS response
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void processrad(u8 * buf, int len)
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{
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u8 b[MAXCONTROL];
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MD5_CTX ctx;
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u8 r;
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sessionidt s;
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tunnelidt t = 0;
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hasht hash;
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u8 routes = 0;
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#ifdef STAT_CALLS
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STAT(call_processrad);
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#endif
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log_hex(5, "RADIUS Response", buf, len);
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if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
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{
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log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len);
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return ;
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}
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len = ntohs(*(u16 *) (buf + 2));
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r = buf[1];
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s = radius[r].session;
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log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u\n", radius_states[radius[r].state], r, s);
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if (!s && radius[r].state != RADIUSSTOP)
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{
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log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n");
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return;
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}
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if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP)
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{
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log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n");
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return;
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}
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t = session[s].tunnel;
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MD5Init(&ctx);
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MD5Update(&ctx, buf, 4);
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MD5Update(&ctx, radius[r].auth, 16);
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MD5Update(&ctx, buf + 20, len - 20);
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MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
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MD5Final(hash, &ctx);
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do {
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if (memcmp(hash, buf + 4, 16))
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{
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log(0, 0, s, session[s].tunnel, " Incorrect auth on RADIUS response\n");
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radius[r].state = RADIUSWAIT;
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break;
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}
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if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) ||
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((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5))
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{
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log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response %d\n", *buf);
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radius[r].state = RADIUSWAIT;
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break;
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}
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if (radius[r].state == RADIUSAUTH)
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{
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log(4, 0, s, session[s].tunnel, " Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
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// process auth response
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if (radius[r].chap)
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{
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// CHAP
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u8 *p = makeppp(b, 0, 0, t, s, PPPCHAP);
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{
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struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP };
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run_plugins(PLUGIN_POST_AUTH, &packet);
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*buf = packet.auth_allowed ? 2 : 3;
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}
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log(3, 0, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
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(*buf == 2) ? "allowed" : "denied");
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*p = (*buf == 2) ? 3 : 4; // ack/nak
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p[1] = radius[r].id;
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*(u16 *) (p + 2) = ntohs(4); // no message
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tunnelsend(b, (p - b) + 4, t); // send it
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}
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else
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{
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// PAP
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u8 *p = makeppp(b, 0, 0, t, s, PPPPAP);
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{
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struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP };
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run_plugins(PLUGIN_POST_AUTH, &packet);
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*buf = packet.auth_allowed ? 2 : 3;
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}
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log(3, 0, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
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(*buf == 2) ? "allowed" : "denied");
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// ack/nak
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*p = *buf;
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p[1] = radius[r].id;
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*(u16 *) (p + 2) = ntohs(5);
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p[4] = 0; // no message
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tunnelsend(b, (p - b) + 5, t); // send it
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}
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if (*buf == 2)
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{
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// Login successful
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// Extract IP, routes, etc
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u8 *p = buf + 20;
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u8 *e = buf + len;
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for (p = buf + 20; p < e && p[1]; p += p[1])
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{
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if (*p == 8)
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{
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// Statically assigned address
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log(3, 0, s, session[s].tunnel, " Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2)));
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session[s].ip = ntohl(*(u32 *) (p + 2));
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}
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else if (*p == 135)
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{
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// DNS address
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log(3, 0, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
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session[s].dns1 = ntohl(*(u32 *) (p + 2));
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}
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else if (*p == 136)
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{
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// DNS address
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log(3, 0, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
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session[s].dns2 = ntohl(*(u32 *) (p + 2));
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}
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else if (*p == 22)
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{
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// framed-route
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ipt ip = 0, mask = 0;
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u8 u = 0;
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u8 bits = 0;
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u8 *n = p + 2;
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u8 *e = p + p[1];
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while (n < e && (isdigit(*n) || *n == '.'))
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{
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if (*n == '.')
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{
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ip = (ip << 8) + u;
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u = 0;
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}
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else
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u = u * 10 + *n - '0';
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n++;
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}
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ip = (ip << 8) + u;
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if (*n == '/')
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{
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n++;
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while (n < e && isdigit(*n))
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bits = bits * 10 + *n++ - '0';
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mask = (( -1) << (32 - bits));
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}
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else if ((ip >> 24) < 128)
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mask = 0xFF0000;
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else if ((ip >> 24) < 192)
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mask = 0xFFFF0000;
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else
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mask = 0xFFFFFF00;
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if (routes == MAXROUTE)
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{
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log(1, 0, s, session[s].tunnel, " Too many routes\n");
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}
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else
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{
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log(3, 0, s, session[s].tunnel, " Radius reply contains route for %d/%d\n",
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inet_toa(ip),
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inet_toa(mask));
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session[s].route[routes].ip = ip;
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session[s].route[routes].mask = mask;
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routes++;
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}
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}
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else if (*p == 26)
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{
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// Vendor-Specific Attribute
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int vendor = ntohl(*(int *)(p + 2));
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|
char attrib = *(p + 6);
|
|
char attrib_length = *(p + 7) - 2;
|
|
log(3, 0, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
|
|
if (attrib_length == 0) continue;
|
|
if (attrib != 1)
|
|
log(3, 0, s, session[s].tunnel, " Unknown vendor-specific\n");
|
|
else
|
|
{
|
|
char *avpair, *value, *key, *newp;
|
|
avpair = key = calloc(attrib_length + 1, 1);
|
|
memcpy(avpair, p + 8, attrib_length);
|
|
log(3, 0, s, session[s].tunnel, " Cisco-Avpair value: %s\n", avpair);
|
|
do {
|
|
value = strchr(key, '=');
|
|
if (!value) break;
|
|
*value++ = 0;
|
|
|
|
// Trim quotes off reply string
|
|
if (*value == '\'' || *value == '\"')
|
|
{
|
|
char *x;
|
|
value++;
|
|
x = value + strlen(value) - 1;
|
|
if (*x == '\'' || *x == '\"')
|
|
*x = 0;
|
|
}
|
|
|
|
// Run hooks
|
|
newp = strchr(value, ',');
|
|
if (newp) *newp++ = 0;
|
|
{
|
|
struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
|
|
run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
|
|
}
|
|
key = newp;
|
|
} while (newp);
|
|
free(avpair);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (*buf == 3)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user);
|
|
break;
|
|
}
|
|
|
|
// Check for Assign-IP-Address
|
|
if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
|
|
{
|
|
assign_ip_address(s);
|
|
if (session[s].ip)
|
|
log(3, 0, s, t, " No IP allocated by radius. Assigned %s from pool\n",
|
|
inet_toa(htonl(session[s].ip)));
|
|
else
|
|
log(3, 0, s, t, " No IP allocated by radius. None available in pool\n");
|
|
}
|
|
if (!session[s].dns1 && config->default_dns1)
|
|
{
|
|
session[s].dns1 = htonl(config->default_dns1);
|
|
log(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(config->default_dns1));
|
|
}
|
|
if (!session[s].dns2 && config->default_dns2)
|
|
{
|
|
session[s].dns2 = htonl(config->default_dns2);
|
|
log(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(config->default_dns2));
|
|
}
|
|
|
|
if (session[s].ip)
|
|
{
|
|
// Valid Session, set it up
|
|
session[s].sid = 0;
|
|
sessionsetup(t, s, routes);
|
|
}
|
|
else
|
|
{
|
|
log(0, 0, s, t, " End of processrad(), but no valid session exists.\n");
|
|
sessionkill(s, "Can't create valid session");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
log(3, 0, s, t, " RADIUS response in state %d\n", radius[r].state);
|
|
}
|
|
} while (0);
|
|
|
|
// finished with RADIUS
|
|
radiusclear(r, s);
|
|
}
|
|
|
|
// Send a retry for RADIUS/CHAP message
|
|
void radiusretry(u8 r)
|
|
{
|
|
sessionidt s = radius[r].session;
|
|
tunnelidt t = 0;
|
|
#ifdef STAT_CALLS
|
|
STAT(call_radiusretry);
|
|
#endif
|
|
if (s)
|
|
t = session[s].tunnel;
|
|
radius[r].retry = 0;
|
|
switch (radius[r].state)
|
|
{
|
|
case RADIUSCHAP: // sending CHAP down PPP
|
|
sendchap(t, s);
|
|
break;
|
|
case RADIUSIPCP:
|
|
sendipcp(t, s); // send IPCP
|
|
break;
|
|
case RADIUSAUTH: // sending auth to RADIUS server
|
|
radiussend(r, RADIUSAUTH);
|
|
break;
|
|
case RADIUSSTART: // sending start accounting to RADIUS server
|
|
radiussend(r, RADIUSSTART);
|
|
break;
|
|
case RADIUSSTOP: // sending stop accounting to RADIUS server
|
|
radiussend(r, RADIUSSTOP);
|
|
break;
|
|
default:
|
|
case RADIUSNULL: // Not in use
|
|
case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server
|
|
// free up RADIUS task
|
|
radiusclear(r, s);
|
|
log(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void radius_clean()
|
|
{
|
|
int i;
|
|
|
|
log(1, 0, 0, 0, "Cleaning radius session array\n");
|
|
|
|
for (i = 1; i < MAXRADIUS; i++)
|
|
{
|
|
if (radius[i].retry == 0
|
|
|| !session[radius[i].session].opened
|
|
|| session[radius[i].session].die
|
|
|| session[radius[i].session].tunnel == 0)
|
|
radiusclear(i, 0);
|
|
}
|
|
}
|