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rc: pptpd.c: rewrite pptpd FW rules

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- avoid problems while starting/stopping in the GUI (and also in other cases)
- remove FW rules if start of pptpd failed
- use logmsg()
- some other fixes
arm-master
pedro 3 years ago
parent 4f65bc73a5
commit c2dc4fc3ea
3 changed files with 123 additions and 74 deletions
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17
release/src-rt-6.x.4708/router/rc/firewall.c
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@ -805,14 +805,6 @@ static void mangle_table(void)
}
}
#endif
#ifdef TCONFIG_PPTPD
/* pptp server: bypass CTF if enabled */
if (nvram_match("pptpd_enable", "1") && !nvram_get_int("ctf_disable")) {
ipt_write("-A PREROUTING -p tcp --dport 1723 -j MARK --set-mark 0x01/0x7\n"
"-A PREROUTING -p 47 -j MARK --set-mark 0x01/0x7\n");
}
#endif
#endif /* TCONFIG_BCMARM */
ipt_routerpolicy();
@ -1329,11 +1321,6 @@ static void filter_input(void)
ipt_write("-A INPUT -p udp --dport 520 -j ACCEPT\n");
#ifdef TCONFIG_PPTPD
/* Add for pptp server */
if (nvram_match("pptpd_enable", "1"))
ipt_write("-A INPUT -p tcp --dport 1723 -j ACCEPT\n"
"-A INPUT -p 47 -j ACCEPT\n");
/* Add for pptp client */
pptp_client_firewall("INPUT", "", ipt_write);
#endif
@ -2210,6 +2197,10 @@ int start_firewall(void)
unlink("/var/webmon/domain");
unlink("/var/webmon/search");
#ifdef TCONFIG_PPTPD
run_pptpd_firewall_script();
#endif
#ifdef TCONFIG_NGINX
/* Web Server WAN access */
run_nginx_firewall_script();

177
release/src-rt-6.x.4708/router/rc/pptpd.c
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@ -38,6 +38,12 @@
#define PPTPD_SECRETS PPTPD_DIR"/chap-secrets"
#define PPTPD_CONNECTED PPTPD_DIR"/pptpd_connected"
#define PPTPD_SHUTDOWN PPTPD_DIR"/pptpd_shutdown"
#define PPTPD_FW_SCRIPT PPTPD_DIR"/pptpd-fw.sh"
#define PPTPD_FW_DEL_SCRIPT PPTPD_DIR"/pptpd-clear-fw-tmp.sh"
/* needed by logmsg() */
#define LOGMSG_DISABLE DISABLE_SYSLOG_OSM
#define LOGMSG_NVDEBUG "pptpd_debug"
static char *ip2bcast(char *ip, char *netmask, char *buf, const size_t buf_sz)
@ -79,15 +85,90 @@ static void write_chap_secret(char *file)
fclose(fp);
}
void start_pptpd(int force)
static void build_pptpd_firewall(void)
{
FILE *fp;
int count = 0, nowins = 0, pptpd_opt;
char bcast[32];
#ifdef TCONFIG_BCMARM
int ctf_disable = nvram_get_int("ctf_disable");
#endif /* TCONFIG_BCMARM */
chains_log_detection();
memset(bcast, 0, sizeof(bcast));
ip2bcast(nvram_safe_get("lan_ipaddr"), nvram_safe_get("lan_netmask"), bcast, sizeof(bcast));
/* ip-up */
if (!(fp = fopen(PPTPD_UP_SCRIPT, "w"))) {
perror(PPTPD_UP_SCRIPT);
return;
}
fprintf(fp, "#!/bin/sh\n"
"echo \"$PPPD_PID $1 $5 $6 $PEERNAME $(date +%%s)\" >> "PPTPD_CONNECTED"\n"
"iptables -I INPUT -i $1 -j %s\n"
"iptables -I FORWARD -i $1 -j ACCEPT\n"
"iptables -I FORWARD -o $1 -j ACCEPT\n"
"iptables -I FORWARD -i $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu\n"
"iptables -t nat -I PREROUTING -i $1 -p udp -m udp --sport 9 -j DNAT --to-destination %s\n" /* rule for wake on lan over pptp tunnel */
"%s\n",
chain_in_accept,
bcast,
nvram_safe_get("pptpd_ipup_script"));
#ifdef TCONFIG_BCMARM
if (!ctf_disable) /* bypass CTF if enabled */
fprintf(fp, "iptables -t mangle -A FORWARD -i $1 -m state --state NEW -j MARK --set-mark 0x01/0x7\n");
#endif /* TCONFIG_BCMARM */
fclose(fp);
/* ip-down */
if (!(fp = fopen(PPTPD_DOWN_SCRIPT, "w"))) {
perror(PPTPD_DOWN_SCRIPT);
return;
}
fprintf(fp, "#!/bin/sh\n"
"grep -v $1 "PPTPD_CONNECTED" > "PPTPD_CONNECTED".new\n"
"mv "PPTPD_CONNECTED".new "PPTPD_CONNECTED"\n"
"iptables -D FORWARD -i $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu\n"
"iptables -D INPUT -i $1 -j %s\n"
"iptables -D FORWARD -i $1 -j ACCEPT\n"
"iptables -D FORWARD -o $1 -j ACCEPT\n"
"iptables -t nat -D PREROUTING -i $1 -p udp -m udp --sport 9 -j DNAT --to-destination %s\n" /* rule for wake on lan over pptp tunnel */
"%s\n",
chain_in_accept,
bcast,
nvram_safe_get("pptpd_ipdown_script"));
#ifdef TCONFIG_BCMARM
if (!ctf_disable) /* bypass CTF if enabled */
fprintf(fp, "iptables -t mangle -D FORWARD -i $1 -m state --state NEW -j MARK --set-mark 0x01/0x7\n");
#endif /* TCONFIG_BCMARM */
fclose(fp);
/* firewall */
if (!(fp = fopen(PPTPD_FW_SCRIPT, "w"))) {
perror(PPTPD_FW_SCRIPT);
return;
}
fprintf(fp, "#!/bin/sh\n"
"iptables -A INPUT -p tcp --dport 1723 -j ACCEPT\n"
"iptables -A INPUT -p 47 -j ACCEPT\n");
#ifdef TCONFIG_BCMARM
if (!ctf_disable) /* bypass CTF if enabled */
fprintf(fp, "iptables -t mangle -A PREROUTING -p tcp --dport 1723 -j MARK --set-mark 0x01/0x7\n"
"iptables -t mangle -A PREROUTING -p 47 -j MARK --set-mark 0x01/0x7\n");
}
#endif /* TCONFIG_BCMARM */
fclose(fp);
chmod(PPTPD_UP_SCRIPT, 0744);
chmod(PPTPD_DOWN_SCRIPT, 0744);
chmod(PPTPD_FW_SCRIPT, 0744);
}
void start_pptpd(int force)
{
FILE *fp;
int count = 0, nowins = 0, pptpd_opt, ret;
/* only if enabled or forced */
if (!nvram_get_int("pptpd_enable") && force == 0)
return;
@ -169,7 +250,7 @@ void start_pptpd(int force)
if (strlen(nvram_safe_get("pptpd_wins2")))
fprintf(fp, "ms-wins %s\n", nvram_safe_get("pptpd_wins2"));
fprintf(fp, "minunit 10\n" /* force ppp interface starting from 10 */
fprintf(fp, "minunit 10\n" /* force ppp interface starting from 10 */
"%s\n\n", nvram_safe_get("pptpd_custom"));
fclose(fp);
@ -222,61 +303,23 @@ void start_pptpd(int force)
fclose(fp);
memset(bcast, 0, 32);
ip2bcast(nvram_safe_get("lan_ipaddr"), nvram_safe_get("lan_netmask"), bcast, sizeof(bcast));
chains_log_detection();
/* Create ip-up and ip-down scripts that are unique to pptpd to avoid interference with pppoe and pptpc */
fp = fopen(PPTPD_UP_SCRIPT, "w");
fprintf(fp, "#!/bin/sh\n"
"echo \"$PPPD_PID $1 $5 $6 $PEERNAME $(date +%%s)\" >> "PPTPD_CONNECTED"\n"
"iptables -I INPUT -i $1 -j %s\n"
"iptables -I FORWARD -i $1 -j ACCEPT\n"
"iptables -I FORWARD -o $1 -j ACCEPT\n"
"iptables -I FORWARD -i $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu\n"
"iptables -t nat -I PREROUTING -i $1 -p udp -m udp --sport 9 -j DNAT --to-destination %s\n" /* rule for wake on lan over pptp tunnel */
"%s\n",
chain_in_accept,
bcast,
nvram_safe_get("pptpd_ipup_script"));
#ifdef TCONFIG_BCMARM
if (!ctf_disable) /* bypass CTF if enabled */
fprintf(fp, "iptables -t mangle -A FORWARD -i $1 -m state --state NEW -j MARK --set-mark 0x01/0x7\n");
#endif /* TCONFIG_BCMARM */
fclose(fp);
fp = fopen(PPTPD_DOWN_SCRIPT, "w");
fprintf(fp, "#!/bin/sh\n"
"grep -v $1 "PPTPD_CONNECTED" > "PPTPD_CONNECTED".new\n"
"mv "PPTPD_CONNECTED".new "PPTPD_CONNECTED"\n"
"iptables -D FORWARD -i $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu\n"
"iptables -D INPUT -i $1 -j %s\n"
"iptables -D FORWARD -i $1 -j ACCEPT\n"
"iptables -D FORWARD -o $1 -j ACCEPT\n"
"iptables -t nat -D PREROUTING -i $1 -p udp -m udp --sport 9 -j DNAT --to-destination %s\n" /* rule for wake on lan over pptp tunnel */
"%s\n",
chain_in_accept,
bcast,
nvram_safe_get("pptpd_ipdown_script"));
#ifdef TCONFIG_BCMARM
if (!ctf_disable) /* bypass CTF if enabled */
fprintf(fp, "iptables -t mangle -D FORWARD -i $1 -m state --state NEW -j MARK --set-mark 0x01/0x7\n");
#endif /* TCONFIG_BCMARM */
fclose(fp);
chmod(PPTPD_UP_SCRIPT, 0744);
chmod(PPTPD_DOWN_SCRIPT, 0744);
/* Extract chap-secrets from nvram */
write_chap_secret(PPTPD_SECRETS);
chmod(PPTPD_SECRETS, 0600);
build_pptpd_firewall();
run_pptpd_firewall_script();
/* Execute pptpd daemon */
eval("pptpd", "-c", PPTPD_CONFFILE, "-o", PPTPD_OPTIONS, "-C", "50");
ret = eval("pptpd", "-c", PPTPD_CONFFILE, "-o", PPTPD_OPTIONS, "-C", "50");
if (ret) {
logmsg(LOG_ERR, "starting pptpd failed - check configuration ...");
stop_pptpd();
}
else
logmsg(LOG_INFO, "pptpd is started");
}
void stop_pptpd(void)
@ -306,18 +349,17 @@ void stop_pptpd(void)
killall_tk_period_wait("pptpd", 50);
killall_tk_period_wait("bcrelay", 50);
logmsg(LOG_INFO, "pptpd is stopped");
/* Delete all files for this server */
unlink(PPTPD_SHUTDOWN);
eval("rm", "-rf", PPTPD_CONFFILE, PPTPD_OPTIONS, PPTPD_DOWN_SCRIPT, PPTPD_UP_SCRIPT, PPTPD_SECRETS);
run_del_firewall_script(PPTPD_FW_SCRIPT, PPTPD_FW_DEL_SCRIPT);
/* Attempt to remove directory. Will fail if not empty */
rmdir(PPTPD_DIR);
/* clean-up */
system("/bin/rm -rf "PPTPD_DIR);
}
void write_pptpd_dnsmasq_config(FILE* f) {
if (nvram_get_int("pptpd_enable"))
void write_pptpd_dnsmasq_config(FILE* f)
{
if (pidof("pptpd") > 0)
fprintf(f, "interface=ppp1*\n" /* Listen on the ppp1* interfaces (wildcard *); we start with 10 and up ... see minunit 10 */
"no-dhcp-interface=ppp1*\n" /* Do not provide DHCP, but do provide DNS service */
"interface=vlan*\n" /* Listen on the vlan* interfaces (wildcard *) */
@ -325,3 +367,18 @@ void write_pptpd_dnsmasq_config(FILE* f) {
"interface=eth*\n" /* Listen on the eth* interfaces (wildcard *) */
"no-dhcp-interface=eth*\n"); /* Do not provide DHCP, but do provide DNS service */
}
void run_pptpd_firewall_script(void)
{
FILE *fp;
/* first remove existing firewall rule(s) */
run_del_firewall_script(PPTPD_FW_SCRIPT, PPTPD_FW_DEL_SCRIPT);
/* then (re-)add firewall rule(s) */
if ((fp = fopen(PPTPD_FW_SCRIPT, "r"))) {
fclose(fp);
logmsg(LOG_DEBUG, "*** %s: running firewall script: %s", __FUNCTION__, PPTPD_FW_SCRIPT);
eval(PPTPD_FW_SCRIPT);
}
}

3
release/src-rt-6.x.4708/router/rc/rc.h
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@ -549,11 +549,12 @@ extern void start_ups();
extern void stop_ups();
#endif
/* pptp.c */
/* pptpd.c */
#ifdef TCONFIG_PPTPD
extern void start_pptpd(int force);
extern void stop_pptpd(void);
extern void write_pptpd_dnsmasq_config(FILE* f);
extern void run_pptpd_firewall_script(void);
#endif
/* openvpn.c */

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