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linux-2.2.17-stealth1.diff

linux-2.2.17-stealth1.diff
Posted Sep 6, 2000
Authored by Sean Trifero | Site innu.org

Patch for linux kernel 2.2.17 to discard packets that many OS detection tools use to query the TCP/IP stack. Includes logging of the dropped query packets and packets with bogus flags.

Changes: Now works with kernel v2.2.17.
tags | kernel, tcp
systems | linux
SHA-256 | e372ecaac931c3275b54326bd9081858a084f41c95552cc8459bf05872f8807a

linux-2.2.17-stealth1.diff

Change Mirror Download
diff -urP linux/Documentation/Configure.help linux/Documentation/Configure.help
--- linux/Documentation/Configure.help Mon Sep 4 13:39:15 2000
+++ linux/Documentation/Configure.help Tue Sep 5 10:40:45 2000
@@ -1225,6 +1225,32 @@

If unsure, say Y.

+IP: TCP stack options
+CONFIG_NET_STEALTH
+ If you say Y here, note that these options are now enabled by
+ default; you can disable them by executing the commands
+
+ echo 0 >/proc/sys/net/ipv4/tcp_ignore_ack
+ echo 0 >/proc/sys/net/ipv4/tcp_ignore_bogus
+ echo 0 >/proc/sys/net/ipv4/tcp_ignore_synfin
+
+ at boot time after the proc filesystem has been mounted.
+
+ If you say M here, a module will be built that when inserted will
+ deny the same packets as above. Due to the nightmare of adding
+ sysctl to a module, all module based sysctl options are in
+ /proc/net instead of /proc/sys/net/ipv4 for now.
+
+ If security is more important, say Y or M.
+
+Log all droped packets
+CONFIG_NET_STEALTH_LOG
+ This turns on a logging facility that logs all tcp packets with
+ bad flags. If you said Y to "TCP stack options", say Y.
+
+ note, if you said M to TCP stack options, these will be set Y by
+ default.
+
Sun floppy controller support
CONFIG_BLK_DEV_SUNFD
This is support for floppy drives on Sun SPARC workstations. Say Y
diff -urP linux/arch/alpha/defconfig linux/arch/alpha/defconfig
--- linux/arch/alpha/defconfig Tue Jan 4 13:12:10 2000
+++ linux/arch/alpha/defconfig Tue Sep 5 10:40:49 2000
@@ -102,6 +102,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/arm/defconfig linux/arch/arm/defconfig
--- linux/arch/arm/defconfig Thu Feb 25 13:46:46 1999
+++ linux/arch/arm/defconfig Tue Sep 5 10:40:49 2000
@@ -93,6 +93,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/i386/defconfig linux/arch/i386/defconfig
--- linux/arch/i386/defconfig Wed May 3 20:16:30 2000
+++ linux/arch/i386/defconfig Tue Sep 5 10:40:49 2000
@@ -119,6 +119,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/m68k/defconfig linux/arch/m68k/defconfig
--- linux/arch/m68k/defconfig Thu Feb 25 13:46:46 1999
+++ linux/arch/m68k/defconfig Tue Sep 5 10:40:49 2000
@@ -89,6 +89,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/mips/defconfig linux/arch/mips/defconfig
--- linux/arch/mips/defconfig Mon Aug 9 15:04:38 1999
+++ linux/arch/mips/defconfig Tue Sep 5 10:40:49 2000
@@ -101,6 +101,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/sparc/defconfig linux/arch/sparc/defconfig
--- linux/arch/sparc/defconfig Wed May 3 20:16:32 2000
+++ linux/arch/sparc/defconfig Tue Sep 5 10:40:49 2000
@@ -114,6 +114,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/arch/sparc64/defconfig linux/arch/sparc64/defconfig
--- linux/arch/sparc64/defconfig Mon Sep 4 13:39:16 2000
+++ linux/arch/sparc64/defconfig Tue Sep 5 10:40:49 2000
@@ -145,6 +145,8 @@
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_ALIAS is not set
# CONFIG_SYN_COOKIES is not set
+CONFIG_NET_STEALTH=y
+CONFIG_NET_STEALTH_LOG=y

#
# (it is safe to leave these untouched)
diff -urP linux/include/linux/sysctl.h linux/include/linux/sysctl.h
--- linux/include/linux/sysctl.h Wed Jun 7 17:26:44 2000
+++ linux/include/linux/sysctl.h Tue Sep 5 10:44:18 2000
@@ -228,7 +228,11 @@
NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
NET_IPV4_ALWAYS_DEFRAG=67,
- NET_IPV4_IP_MASQ_UDP_DLOOSE=68
+ NET_IPV4_IP_MASQ_UDP_DLOOSE=68,
+ NET_TCP_STACK_SYNFIN=69,
+ NET_TCP_STACK_BOGUS=70,
+ NET_TCP_STACK_ACK=71
+
};

enum {
diff -urP linux/net/ipv4/Config.in linux/net/ipv4/Config.in
--- linux/net/ipv4/Config.in Wed Jun 7 17:26:44 2000
+++ linux/net/ipv4/Config.in Tue Sep 5 10:45:02 2000
@@ -74,6 +74,10 @@
fi
fi
bool 'IP: TCP syncookie support (not enabled per default)' CONFIG_SYN_COOKIES
+tristate 'IP: TCP stack options (not enabled per default)' CONFIG_NET_STEALTH
+if [ "$CONFIG_NET_STEALTH" = "y" ]; then
+ bool 'Log all droped packets' CONFIG_NET_STEALTH_LOG
+fi
comment '(it is safe to leave these untouched)'
#bool 'IP: PC/TCP compatibility mode' CONFIG_INET_PCTCP
tristate 'IP: Reverse ARP' CONFIG_INET_RARP
diff -urP linux/net/ipv4/Makefile linux/net/ipv4/Makefile
--- linux/net/ipv4/Makefile Mon Jan 4 18:31:35 1999
+++ linux/net/ipv4/Makefile Tue Sep 5 10:45:02 2000
@@ -58,6 +58,10 @@
MX_OBJS += ip_gre.o
endif
endif
+
+ifeq ($(CONFIG_NET_STEALTH),m)
+M_OBJS += stealth.o
+endif

ifeq ($(CONFIG_IP_MASQUERADE),y)
IPV4X_OBJS += ip_masq.o ip_masq_app.o
diff -urP linux/net/ipv4/stealth.c linux/net/ipv4/stealth.c
--- linux/net/ipv4/stealth.c Wed Dec 31 19:00:00 1969
+++ linux/net/ipv4/stealth.c Tue Sep 5 10:46:29 2000
@@ -0,0 +1,264 @@
+/* Stealth module by Derek Callaway <super@innu.org> -- S@IRC
+ * Original patch by Sean Trifero <sean@innu.org> -- solar@IRC
+ * $Id: stealth.c,v 1.3 2000/03/22 15:04:44 super Exp $
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/firewall.h>
+#include <linux/ip_fw.h>
+#include <asm/uaccess.h>
+#ifdef __SMP__
+#define SLOT_NUMBER() (cpu_number_map[smp_processor_id()]*2 + !in_interrupt())
+#else
+#define SLOT_NUMBER() (!in_interrupt())
+#endif
+#define STEALTH_INPUT_CHAIN stealth_chains
+#define STEALTH_FORWARD_CHAIN (stealth_chains->next)
+#define STEALTH_OUTPUT_CHAIN (stealth_chains->next->next)
+
+/* kernel space variables */
+static char kmsg[3][3] = { "1\n\0", "1\n\0", "1\n\0" };
+static char *tcp_ignore_ack = kmsg[0];
+static char *tcp_ignore_bogus = kmsg[1];
+static char *tcp_ignore_synfin = kmsg[2];
+
+/* structures from linux/net/ipv4/ip_fw.c */
+
+/* Head of linked list of fw rules */
+struct ip_counters
+{
+ __u64 pcnt, bcnt; /* Packet and byte counters */
+};
+
+struct ip_reent
+{
+ struct ip_chain *prevchain; /* Pointer to referencing chain */
+ struct ip_fwkernel *prevrule; /* Pointer to referencing rule */
+ struct ip_counters counters;
+};
+
+struct ip_chain
+{
+ ip_chainlabel label; /* Defines the label for each block */
+ struct ip_chain *next; /* Pointer to next block */
+ struct ip_fwkernel *chain; /* Pointer to first rule in block */
+ __u32 refcount; /* Number of refernces to block */
+ int policy; /* Default rule for chain. Only *
+ * used in built in chains */
+ struct ip_reent reent[0]; /* Actually several of these */
+};
+
+static struct ip_chain *stealth_chains;
+
+int stealth_check (struct iphdr *, const char *, __u16 *, struct ip_chain *,
+ struct sk_buff *, unsigned int, int);
+
+int
+stealth_input_check (struct firewall_ops *this, int pf, struct device *dev,
+ void *phdr, void *arg, struct sk_buff **pskb)
+{
+ return (stealth_check (phdr, dev->name,
+ arg, STEALTH_INPUT_CHAIN, *pskb, SLOT_NUMBER (), 0));
+}
+
+int
+stealth_output_check (struct firewall_ops *this, int pf, struct device *dev,
+ void *phdr, void *arg, struct sk_buff **pksb)
+{
+ return (FW_SKIP);
+}
+
+int
+stealth_forward_check (struct firewall_ops *this, int pf, struct device *dev,
+ void *phdr, void *arg, struct sk_buff **pksb)
+{
+ return (FW_SKIP);
+}
+
+struct firewall_ops ipfw_ops = {
+ NULL,
+ stealth_output_check,
+ stealth_input_check,
+ stealth_forward_check,
+ PF_INET,
+ 31337 /* This priority should be adequate. */
+};
+
+int
+stealth_check (struct iphdr *ip,
+ const char *rif,
+ __u16 * redirport,
+ struct ip_chain *chain,
+ struct sk_buff *skb, unsigned int slot, int testing)
+{
+ struct tcphdr *tcp;
+ if (ip->protocol != IPPROTO_TCP)
+ {
+ /* Not a TCP packet, don't worry about it. */
+ return (FW_SKIP);
+ }
+ tcp = (struct tcphdr *) ((__u32 *) ip + ip->ihl);
+ /* Check for those nasty unused bit fields. */
+ if ((*tcp_ignore_bogus != '0') && (tcp->res1 || tcp->res2))
+ {
+ /* I know goto statement should be avoided but I
+ * seriously doubt that this will evolve into
+ * spaghetti code. Furthermore, these jumps are
+ * extremely localized. */
+ goto tcp_bad_flags;
+ }
+ switch (tcp->fin)
+ {
+ case 0:
+ goto done;
+ default:
+ if (((*tcp_ignore_synfin != '0') && (tcp->syn))
+ || ((*tcp_ignore_ack != '0') && (tcp->psh) && (tcp->urg)))
+ {
+ goto tcp_bad_flags;
+ }
+ }
+ if ((*tcp_ignore_bogus != '0') && (!(tcp->ack || tcp->syn || tcp->rst)))
+ {
+ goto tcp_bad_flags;
+ }
+ goto done;
+tcp_bad_flags:
+#ifdef CONFIG_TCPIP_STACK_LOG
+ printk (KERN_INFO
+ "Packet log: badflag DENY %s PROTO=TCP %d.%d.%d.%d:%d "
+ "%d.%d.%d.%d:%d L=%hu:%u:%u S=0x%2.2hX I=%hu:%u:%u "
+ "T=%hu %c%c%c%c%c%c%c%c\n",
+ skb->dev->name, NIPQUAD (skb->nh.iph->saddr),
+ ntohs (skb->h.th->source), NIPQUAD (skb->nh.iph->daddr),
+ ntohs (skb->h.th->dest), ntohs (skb->nh.iph->tot_len), skb->len,
+ skb->len - skb->h.th->doff * 4, skb->nh.iph->tos,
+ ntohs (skb->nh.iph->id), ntohl (skb->h.th->seq),
+ ntohl (skb->h.th->ack_seq), skb->nh.iph->ttl,
+ skb->h.th->res1 ? '1' : '.', skb->h.th->res2 ? '2' : '.',
+ skb->h.th->ack ? 'A' : '.', skb->h.th->syn ? 'S' : '.',
+ skb->h.th->fin ? 'F' : '.', skb->h.th->rst ? 'R' : '.',
+ skb->h.th->psh ? 'P' : '.', skb->h.th->urg ? 'U' : '.');
+}
+#endif
+/* FW_BLOCK acts like ipchains -j DENY */
+return (FW_BLOCK);
+done:
+/* FW_SKIP allows the next chain to evaluate the traffic. */
+return (FW_SKIP);
+}
+
+static ssize_t
+module_output (struct file *file, char *buf, size_t len, loff_t * offset)
+{
+ static unsigned short done = 0;
+ unsigned short x = 0;
+ /* user land storage */
+ char umsg[2] = { 0 };
+ switch (file->f_dentry->d_name.name[11])
+ {
+ case 'a':
+ x = 0;
+ break;
+ case 'b':
+ x = 1;
+ break;
+ case 's':
+ x = 2;
+ }
+ if (done)
+ return (done = 0);
+ umsg[0] = kmsg[x][0], umsg[1] = '\n';
+ put_user (umsg[0], buf);
+ put_user (umsg[1], buf + 1);
+ put_user (umsg[2], buf + 2);
+ return (done = 2);
+}
+
+static ssize_t
+module_input (struct file *file, const char *buf, size_t length,
+ loff_t * offset)
+{
+ unsigned short x = 0;
+ switch (file->f_dentry->d_name.name[11])
+ {
+ case 'a':
+ x = 0;
+ break;
+ case 'b':
+ x = 1;
+ break;
+ case 's':
+ x = 2;
+ }
+ get_user (kmsg[x][0], buf);
+ kmsg[x][1] = 0;
+ return (2);
+}
+
+static int
+module_permission (struct inode *inode, int op)
+{
+ if (op == 4 || (op == 2 && current->euid == 0))
+ return (0);
+ return (-EACCES);
+}
+
+int
+module_open (struct inode *inode, struct file *file)
+{
+ MOD_INC_USE_COUNT;
+ return (0);
+}
+
+int
+module_close (struct inode *inode, struct file *file)
+{
+ MOD_DEC_USE_COUNT;
+ return (0);
+}
+
+/* <linux/fs.h> */
+
+static struct file_operations fops =
+ { NULL, module_output, module_input, NULL, NULL, NULL, NULL, module_open,
+ NULL, module_close };
+static struct inode_operations iops =
+ { &fops, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, module_permission };
+
+/* <linux/proc_fs.h> */
+
+static struct proc_dir_entry bogus =
+ { 0, 16, "tcp_ignore_bogus", S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0, 0, &iops,
+ NULL };
+static struct proc_dir_entry synfin =
+ { 0, 17, "tcp_ignore_synfin", S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0, 0,
+ &iops, NULL };
+static struct proc_dir_entry ack =
+ { 0, 14, "tcp_ignore_ack", S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0, 0, &iops,
+ NULL };
+
+int
+init_module (void)
+{
+ proc_net_register (&bogus);
+ proc_net_register (&synfin);
+ proc_net_register (&ack);
+ register_firewall (PF_INET, &ipfw_ops);
+ return (0);
+}
+
+void
+cleanup_module (void)
+{
+ proc_net_unregister (bogus.low_ino);
+ proc_net_unregister (synfin.low_ino);
+ proc_net_unregister (ack.low_ino);
+ unregister_firewall (PF_INET, &ipfw_ops);
+}
diff -urP linux/net/ipv4/sysctl_net_ipv4.c linux/net/ipv4/sysctl_net_ipv4.c
--- linux/net/ipv4/sysctl_net_ipv4.c Wed Jun 7 17:26:44 2000
+++ linux/net/ipv4/sysctl_net_ipv4.c Tue Sep 5 10:55:08 2000
@@ -64,6 +64,9 @@
extern int sysctl_tcp_rfc1337;
extern int sysctl_tcp_syn_taildrop;
extern int sysctl_max_syn_backlog;
+extern int sysctl_tcp_ignore_synfin;
+extern int sysctl_tcp_ignore_bogus;
+extern int sysctl_tcp_ignore_ack;

/* From icmp.c */
extern int sysctl_icmp_destunreach_time;
@@ -175,6 +178,14 @@
#ifdef CONFIG_SYN_COOKIES
{NET_TCP_SYNCOOKIES, "tcp_syncookies",
&sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
+#endif
+#ifdef CONFIG_NET_STEALTH
+ {NET_TCP_STACK_SYNFIN, "tcp_ignore_synfin",
+ &sysctl_tcp_ignore_synfin, sizeof(int), 0644, NULL, &proc_dointvec},
+ {NET_TCP_STACK_BOGUS, "tcp_ignore_bogus",
+ &sysctl_tcp_ignore_bogus, sizeof(int), 0644, NULL, &proc_dointvec},
+ {NET_TCP_STACK_ACK, "tcp_ignore_ack",
+ &sysctl_tcp_ignore_ack, sizeof(int), 0644, NULL, &proc_dointvec},
#endif
{NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
sizeof(int), 0644, NULL, &proc_dointvec},
diff -urP linux/net/ipv4/tcp_input.c linux/net/ipv4/tcp_input.c
--- linux/net/ipv4/tcp_input.c Mon Sep 4 13:39:29 2000
+++ linux/net/ipv4/tcp_input.c Tue Sep 5 10:50:03 2000
@@ -65,11 +65,21 @@
#include <linux/ipsec.h>

#ifdef CONFIG_SYSCTL
-#define SYNC_INIT 0 /* let the user enable it */
+#define SYNC_INIT 0 /* let the user enable this */
#else
#define SYNC_INIT 1
#endif

+#ifdef CONFIG_NET_STEALTH
+#define TCP_SYNFIN 1
+#define TCP_BOGUS 1
+#define TCP_ACK 1
+#else
+#define TCP_SYNFIN 0
+#define TCP_BOGUS 0
+#define TCP_ACK 0
+#endif
+
extern int sysctl_tcp_fin_timeout;

/* These are on by default so the code paths get tested.
@@ -80,6 +90,10 @@
int sysctl_tcp_sack = 1;

int sysctl_tcp_syncookies = SYNC_INIT;
+int sysctl_tcp_ignore_synfin = TCP_SYNFIN;
+int sysctl_tcp_ignore_bogus = TCP_BOGUS;
+int sysctl_tcp_ignore_ack = TCP_ACK;
+
int sysctl_tcp_stdurg;
int sysctl_tcp_rfc1337;

diff -urP linux/net/ipv4/tcp_ipv4.c linux/net/ipv4/tcp_ipv4.c
--- linux/net/ipv4/tcp_ipv4.c Mon Sep 4 13:39:29 2000
+++ linux/net/ipv4/tcp_ipv4.c Tue Sep 5 10:58:16 2000
@@ -67,6 +67,9 @@
extern int sysctl_tcp_window_scaling;
extern int sysctl_tcp_sack;
extern int sysctl_tcp_syncookies;
+extern int sysctl_tcp_ignore_synfin;
+extern int sysctl_tcp_ignore_bogus;
+extern int sysctl_tcp_ignore_ack;
extern int sysctl_ip_dynaddr;
extern __u32 sysctl_wmem_max;
extern __u32 sysctl_rmem_max;
@@ -1745,6 +1748,21 @@
len < (th->doff * 4))
goto bad_packet;

+ if(sysctl_tcp_ignore_synfin) {
+ if(th->fin && th->syn)
+ goto tcp_bad_flags;
+ }
+
+ if(sysctl_tcp_ignore_bogus) {
+ if(!(th->ack || th->syn || th->rst) || th->res1 || th->res2)
+ goto tcp_bad_flags;
+ }
+
+ if(sysctl_tcp_ignore_ack) {
+ if(th->fin && th->psh && th->urg)
+ goto tcp_bad_flags;
+ }
+
#ifdef CONFIG_IP_TRANSPARENT_PROXY
if (IPCB(skb)->redirport)
sk = tcp_v4_proxy_lookup(th->dest, skb->nh.iph->saddr, th->source,
@@ -1778,6 +1796,32 @@

__skb_queue_tail(&sk->back_log, skb);
return 0;
+
+#ifdef CONFIG_NET_STEALTH_LOG
+tcp_bad_flags:
+ printk(KERN_INFO
+ "Packet log: badflag DENY %s PROTO=TCP %d.%d.%d.%d:%d "
+ "%d.%d.%d.%d:%d L=%hu:%u:%u S=0x%2.2hX I=%hu:%u:%u "
+ "T=%hu %c%c%c%c%c%c%c%c\n",
+ skb->dev->name, NIPQUAD(skb->nh.iph->saddr), ntohs(th->source),
+ NIPQUAD(skb->nh.iph->daddr), ntohs(th->dest),
+ ntohs(skb->nh.iph->tot_len), skb->len, skb->len - th->doff*4,
+ skb->nh.iph->tos, ntohs(skb->nh.iph->id), ntohl(th->seq),
+ ntohl(th->ack_seq), skb->nh.iph->ttl,
+ th->res1 ? '1' : '.',
+ th->res2 ? '2' : '.',
+ th->ack ? 'A' : '.',
+ th->syn ? 'S' : '.',
+ th->fin ? 'F' : '.',
+ th->rst ? 'R' : '.',
+ th->psh ? 'P' : '.',
+ th->urg ? 'U' : '.' );
+ goto bad_packet;
+
+#else
+tcp_bad_flags:
+ goto bad_packet;
+#endif

no_tcp_socket:
tcp_v4_send_reset(skb);

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