[svn] - new ip cloaking module
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nenolod
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8aba962d43
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14
ChangeLog
14
ChangeLog
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@ -1,3 +1,17 @@
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jilles 2007/06/30 22:15:35 UTC (20070630-3520)
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Log:
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monitor: send the same message buffer to all users
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monitoring a certain nick; the target field of the
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numeric becomes *, much like server notices
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Changes: Modified:
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+6 -0 trunk/doc/monitor.txt (File Modified)
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+3 -0 trunk/include/send.h (File Modified)
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+3 -15 trunk/src/monitor.c (File Modified)
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+35 -0 trunk/src/send.c (File Modified)
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jilles 2007/06/22 21:59:09 UTC (20070622-3518)
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Log:
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Call add_to_hostname_hash() with correct (orig) hostname.
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@ -1,7 +1,7 @@
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#
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# Makefile.in for ircd/contrib
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#
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# $Id: Makefile.in 3478 2007-05-24 15:10:06Z jilles $
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# $Id: Makefile.in 3522 2007-07-06 07:48:28Z nenolod $
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#
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CC = @CC@
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RM = @RM@
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@ -38,6 +38,7 @@ SRCS = \
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extb_extgecos.c \
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hurt.c \
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ip_cloaking.c \
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ip_cloaking_old.c \
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sno_farconnect.c \
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sno_globalkline.c \
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sno_globaloper.c \
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@ -1,4 +1,4 @@
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/* $Id: ip_cloaking.c 2805 2006-12-05 12:45:43Z jilles $ */
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/* $Id: ip_cloaking.c 3522 2007-07-06 07:48:28Z nenolod $ */
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#include "stdinc.h"
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#include "modules.h"
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@ -42,7 +42,7 @@ mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
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};
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DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
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ip_cloaking_hfnlist, "$Revision: 2805 $");
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ip_cloaking_hfnlist, "$Revision: 3522 $");
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static void
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distribute_hostchange(struct Client *client)
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@ -69,45 +69,82 @@ distribute_hostchange(struct Client *client)
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ClearDynSpoof(client);
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}
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static void
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do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
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#define Nval 0x8c3a48ac
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#define HOSTLEN 63
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#define INITDATA "98fwqefnoiqefv03f423t34gbv3vb89tg432t3b8" /* change this */
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static inline unsigned int
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get_string_entropy(const char *inbuf)
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{
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int cyc;
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unsigned int hosthash = 1, hosthash2 = 1;
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unsigned int maxcycle = strlen(inbuf);
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int len1;
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const char *rest, *next;
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unsigned int accum = 1;
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for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
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hosthash *= (unsigned int) inbuf[cyc];
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while(*inbuf != '\0')
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accum += *inbuf++;
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/* safety: decrement ourselves two steps back */
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for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
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hosthash2 *= (unsigned int) inbuf[cyc];
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/* lets do some bitshifting -- this pretty much destroys the IP
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* sequence, while still providing a checksum. exactly what
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* we're shooting for. --nenolod
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*/
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hosthash += (hosthash2 / KEY);
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hosthash2 += (hosthash / KEY);
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if (ipmask == 0)
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{
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ircsnprintf(outbuf, HOSTLEN, "%s-%X%X",
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ServerInfo.network_name, hosthash2, hosthash);
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len1 = strlen(outbuf);
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rest = strchr(inbuf, '.');
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if (rest == NULL)
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rest = ".";
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/* try to avoid truncation -- jilles */
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while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
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rest = next;
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strlcat(outbuf, rest, HOSTLEN);
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return accum;
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}
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/* calls get_string_entropy() and toasts it against INITDATA */
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static inline unsigned int
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get_string_weighted_entropy(const char *inbuf)
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{
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static int base_entropy = 0;
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unsigned int accum = get_string_entropy(inbuf);
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/* initialize the algorithm if it is not yet ready */
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if (base_entropy == 0)
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base_entropy = get_string_entropy(INITDATA);
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return (Nval * accum) ^ base_entropy;
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}
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static void
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do_host_cloak_ip(const char *inbuf, char *outbuf)
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{
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char *tptr;
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unsigned int accum = get_string_weighted_entropy(inbuf);
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char buf[HOSTLEN];
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strncpy(buf, inbuf, HOSTLEN);
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tptr = strrchr(buf, '.');
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*tptr++ = '\0';
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snprintf(outbuf, HOSTLEN, "%s.%x", buf, accum);
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}
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static void
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do_host_cloak_host(const char *inbuf, char *outbuf)
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{
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char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz";
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char *tptr;
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unsigned int accum = get_string_weighted_entropy(inbuf);
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strncpy(outbuf, inbuf, HOSTLEN);
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/* pass 1: scramble first section of hostname using base26
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* alphabet toasted against the weighted entropy of the string.
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*
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* numbers are not changed at this time, only letters.
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*/
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for (tptr = outbuf; *tptr != '\0'; tptr++)
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{
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if (*tptr == '.')
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break;
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if (isdigit(*tptr) || *tptr == '-')
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continue;
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*tptr = b26_alphabet[(*tptr * accum) % 26];
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}
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/* pass 2: scramble each number in the address */
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for (tptr = outbuf; *tptr != '\0'; tptr++)
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{
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if (isdigit(*tptr))
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{
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*tptr = 48 + ((*tptr * accum) % 10);
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}
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}
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else
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ircsnprintf(outbuf, HOSTLEN, "%X%X.%s",
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hosthash2, hosthash, ServerInfo.network_name);
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}
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static void
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@ -162,9 +199,9 @@ check_new_user(void *vdata)
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}
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source_p->localClient->mangledhost = MyMalloc(HOSTLEN);
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if (!irccmp(source_p->orighost, source_p->sockhost))
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do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 1);
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do_host_cloak_ip(source_p->orighost, source_p->localClient->mangledhost);
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else
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do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0);
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do_host_cloak_host(source_p->orighost, source_p->localClient->mangledhost);
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if (IsDynSpoof(source_p))
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source_p->umodes &= ~user_modes['h'];
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if (source_p->umodes & user_modes['h'])
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@ -0,0 +1,176 @@
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/* $Id: ip_cloaking_old.c 3522 2007-07-06 07:48:28Z nenolod $ */
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#include "stdinc.h"
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#include "modules.h"
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#include "hook.h"
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#include "client.h"
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#include "ircd.h"
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#include "send.h"
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#include "s_conf.h"
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#include "s_user.h"
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#include "s_serv.h"
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#include "tools.h"
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#include "numeric.h"
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/* if you're modifying this module, you'll probably to change this */
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#define KEY 0x13748cfa
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static int
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_modinit(void)
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{
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/* add the usermode to the available slot */
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user_modes['h'] = find_umode_slot();
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construct_umodebuf();
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return 0;
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}
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static void
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_moddeinit(void)
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{
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/* disable the umode and remove it from the available list */
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user_modes['h'] = 0;
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construct_umodebuf();
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}
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static void check_umode_change(void *data);
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static void check_new_user(void *data);
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mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
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{ "umode_changed", (hookfn) check_umode_change },
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{ "new_local_user", (hookfn) check_new_user },
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{ NULL, NULL }
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};
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DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
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ip_cloaking_hfnlist, "$Revision: 3522 $");
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static void
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distribute_hostchange(struct Client *client)
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{
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if (irccmp(client->host, client->orighost))
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sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :is now your hidden host",
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client->host);
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else
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sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :hostname reset",
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client->host);
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sendto_server(NULL, NULL,
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CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
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use_id(&me), use_id(client), client->host);
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sendto_server(NULL, NULL,
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CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
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use_id(&me), use_id(client), client->host);
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sendto_server(NULL, NULL,
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NOCAPS, CAP_TS6, ":%s ENCAP * CHGHOST %s :%s",
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me.name, client->name, client->host);
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if (irccmp(client->host, client->orighost))
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SetDynSpoof(client);
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else
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ClearDynSpoof(client);
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}
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static void
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do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
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{
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int cyc;
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unsigned int hosthash = 1, hosthash2 = 1;
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unsigned int maxcycle = strlen(inbuf);
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int len1;
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const char *rest, *next;
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for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
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hosthash *= (unsigned int) inbuf[cyc];
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/* safety: decrement ourselves two steps back */
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for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
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hosthash2 *= (unsigned int) inbuf[cyc];
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/* lets do some bitshifting -- this pretty much destroys the IP
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* sequence, while still providing a checksum. exactly what
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* we're shooting for. --nenolod
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*/
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hosthash += (hosthash2 / KEY);
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hosthash2 += (hosthash / KEY);
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if (ipmask == 0)
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{
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ircsnprintf(outbuf, HOSTLEN, "%s-%X%X",
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ServerInfo.network_name, hosthash2, hosthash);
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len1 = strlen(outbuf);
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rest = strchr(inbuf, '.');
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if (rest == NULL)
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rest = ".";
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/* try to avoid truncation -- jilles */
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while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
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rest = next;
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strlcat(outbuf, rest, HOSTLEN);
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}
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else
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ircsnprintf(outbuf, HOSTLEN, "%X%X.%s",
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hosthash2, hosthash, ServerInfo.network_name);
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}
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static void
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check_umode_change(void *vdata)
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{
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hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
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struct Client *source_p = data->client;
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if (!MyClient(source_p))
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return;
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/* didn't change +h umode, we don't need to do anything */
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if (!((data->oldumodes ^ source_p->umodes) & user_modes['h']))
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return;
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if (source_p->umodes & user_modes['h'])
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{
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if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
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{
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source_p->umodes &= ~user_modes['h'];
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return;
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}
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if (strcmp(source_p->host, source_p->localClient->mangledhost))
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{
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strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN);
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distribute_hostchange(source_p);
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}
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else /* not really nice, but we need to send this numeric here */
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sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
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source_p->host);
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}
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else if (!(source_p->umodes & user_modes['h']))
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{
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if (source_p->localClient->mangledhost != NULL &&
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!strcmp(source_p->host, source_p->localClient->mangledhost))
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{
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strlcpy(source_p->host, source_p->orighost, HOSTLEN);
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distribute_hostchange(source_p);
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}
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}
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}
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static void
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check_new_user(void *vdata)
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{
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struct Client *source_p = (void *)vdata;
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if (IsIPSpoof(source_p))
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{
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source_p->umodes &= ~user_modes['h'];
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return;
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}
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source_p->localClient->mangledhost = MyMalloc(HOSTLEN);
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if (!irccmp(source_p->orighost, source_p->sockhost))
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do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 1);
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else
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do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0);
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if (IsDynSpoof(source_p))
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source_p->umodes &= ~user_modes['h'];
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if (source_p->umodes & user_modes['h'])
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{
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strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
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if (irccmp(source_p->host, source_p->orighost))
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SetDynSpoof(source_p);
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}
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}
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@ -1 +1 @@
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#define SERNO "20070622-3518"
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#define SERNO "20070630-3520"
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