| 1 |
/** |
| 2 |
* clones.C: This file contains functionality implementing clone detection. |
| 3 |
* |
| 4 |
* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team |
| 5 |
* Rights to this code are as documented in COPYING. |
| 6 |
* |
| 7 |
* |
| 8 |
* Portions of this file were derived from sources bearing the following license: |
| 9 |
* Copyright © 2006 Atheme Development Group |
| 10 |
* Rights to this code are documented in doc/LICENCE. |
| 11 |
* |
| 12 |
* $Id: clones.C,v 1.6 2007-09-16 18:54:43 pippijn Exp $ |
| 13 |
*/ |
| 14 |
|
| 15 |
#include <boost/foreach.hpp> |
| 16 |
|
| 17 |
#include "atheme.h" |
| 18 |
#include <libermyth.h> |
| 19 |
#include <ermyth/module.h> |
| 20 |
#include <util/predicates.h> |
| 21 |
|
| 22 |
static char const rcsid[] = "$Id: clones.C,v 1.6 2007-09-16 18:54:43 pippijn Exp $"; |
| 23 |
|
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REGISTER_MODULE ("operserv/clones", false, "The Ermyth Team <http://ermyth.xinutec.org>"); |
| 25 |
|
| 26 |
#define DEFAULT_WARN_CLONES 3 /* IPs with more than this are warned about */ |
| 27 |
#define EXEMPT_GRACE 10 /* exempt IPs exceeding their allowance by this are banned */ |
| 28 |
|
| 29 |
static void os_cmd_clones (sourceinfo_t *si, int parc, char *parv[]); |
| 30 |
static void os_cmd_clones_kline (sourceinfo_t *si, int parc, char *parv[]); |
| 31 |
static void os_cmd_clones_list (sourceinfo_t *si, int parc, char *parv[]); |
| 32 |
static void os_cmd_clones_addexempt (sourceinfo_t *si, int parc, char *parv[]); |
| 33 |
static void os_cmd_clones_delexempt (sourceinfo_t *si, int parc, char *parv[]); |
| 34 |
static void os_cmd_clones_listexempt (sourceinfo_t *si, int parc, char *parv[]); |
| 35 |
|
| 36 |
static void write_exemptdb (void); |
| 37 |
static void load_exemptdb (void); |
| 38 |
|
| 39 |
E cmdvec os_cmdtree; |
| 40 |
E helpvec os_helptree; |
| 41 |
cmdvec os_clones_cmds; |
| 42 |
|
| 43 |
bool kline_enabled; |
| 44 |
|
| 45 |
struct cexcept_t |
| 46 |
{ |
| 47 |
typedef std::vector<cexcept_t *> vector_type; |
| 48 |
|
| 49 |
char *ip; |
| 50 |
int clones; |
| 51 |
char *reason; |
| 52 |
}; |
| 53 |
|
| 54 |
struct hostentry_t |
| 55 |
{ |
| 56 |
char ip[HOSTIPLEN]; |
| 57 |
user_t::vector_type clients; |
| 58 |
time_t lastaction; |
| 59 |
unsigned lastaction_clones; |
| 60 |
}; |
| 61 |
|
| 62 |
static cexcept_t::vector_type clone_exempts; |
| 63 |
|
| 64 |
typedef std::pair<char const * const, hostentry_t *> host_pair; |
| 65 |
typedef std::map<char const * const, hostentry_t *, str_lt> host_map; |
| 66 |
static host_map hostlist; |
| 67 |
|
| 68 |
command_t const os_clones = { "CLONES", N_("Manages network wide clones."), PRIV_AKILL, 4, os_cmd_clones }; |
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|
| 70 |
command_t const os_clones_kline = { "KLINE", N_("Enables/disables klines for excessive clones."), AC_NONE, 1, os_cmd_clones_kline }; |
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command_t const os_clones_list = { "LIST", N_("Lists clones on the network."), AC_NONE, 0, os_cmd_clones_list }; |
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command_t const os_clones_addexempt = { "ADDEXEMPT", N_("Adds a clones exemption."), AC_NONE, 3, os_cmd_clones_addexempt }; |
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command_t const os_clones_delexempt = { "DELEXEMPT", N_("Deletes a clones exemption."), AC_NONE, 1, os_cmd_clones_delexempt }; |
| 74 |
command_t const os_clones_listexempt = { "LISTEXEMPT", N_("Lists clones exemptions."), AC_NONE, 0, os_cmd_clones_listexempt }; |
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|
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static void |
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write_exemptdb (void) |
| 78 |
{ |
| 79 |
FILE *f; |
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|
| 81 |
if (!(f = fopen (DATADIR "/exempts.db.new", "w"))) |
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{ |
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slog (LG_ERROR, "write_exemptdb(): cannot write exempt database: %s", strerror (errno)); |
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return; |
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} |
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|
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fprintf (f, "CK %d\n", kline_enabled ? 1 : 0); |
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foreach (cexcept_t *c, clone_exempts) |
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fprintf (f, "EX %s %d %s\n", c->ip, c->clones, c->reason); |
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|
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fclose (f); |
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|
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if ((rename (DATADIR "/exempts.db.new", DATADIR "/exempts.db")) < 0) |
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{ |
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slog (LG_ERROR, "write_exemptdb(): couldn't rename exempts database."); |
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return; |
| 97 |
} |
| 98 |
} |
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|
| 100 |
static void |
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load_exemptdb (void) |
| 102 |
{ |
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FILE *f; |
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char *item, rBuf[BUFSIZE * 2], *p; |
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|
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if (!(f = fopen (DATADIR "/exempts.db", "r"))) |
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{ |
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slog (LG_DEBUG, "load_exemptdb(): cannot open exempt database: %s", strerror (errno)); |
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return; |
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} |
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|
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while (fgets (rBuf, BUFSIZE * 2, f)) |
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{ |
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item = strtok (rBuf, " "); |
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strip (item); |
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|
| 117 |
if (!strcmp (item, "EX")) |
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{ |
| 119 |
char *ip = strtok (NULL, " "); |
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int clones = atoi (strtok (NULL, " ")); |
| 121 |
char *reason = strtok (NULL, ""); |
| 122 |
|
| 123 |
if (!ip || clones <= 0 || !reason) |
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; /* erroneous, don't add */ |
| 125 |
else |
| 126 |
{ |
| 127 |
cexcept_t *c = new cexcept_t; |
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|
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c->ip = sstrdup (ip); |
| 130 |
c->clones = clones; |
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p = strchr (reason, '\n'); |
| 132 |
if (p != NULL) |
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*p = '\0'; |
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c->reason = sstrdup (reason); |
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clone_exempts.push_back (c); |
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} |
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} |
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else if (!strcmp (item, "CK")) |
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{ |
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char *enable = strtok (NULL, " "); |
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|
| 142 |
if (enable != NULL) |
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kline_enabled = atoi (enable) != 0; |
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} |
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} |
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|
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fclose (f); |
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} |
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|
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static int |
| 151 |
is_exempt (char const * const ip) |
| 152 |
{ |
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/* first check for an exact match */ |
| 154 |
foreach (cexcept_t *c, clone_exempts) |
| 155 |
if (!strcmp (ip, c->ip)) |
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return c->clones; |
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|
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/* then look for cidr */ |
| 159 |
foreach (cexcept_t *c, clone_exempts) |
| 160 |
if (!match_ips (c->ip, ip)) |
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return c->clones; |
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|
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return 0; |
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} |
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|
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static void |
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os_cmd_clones (sourceinfo_t *si, int parc, char *parv[]) |
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{ |
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command_t const *c; |
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char *cmd = parv[0]; |
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|
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/* Bad/missing arg */ |
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if (!cmd) |
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{ |
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command_fail (si, fault::needmoreparams, STR_INSUFFICIENT_PARAMS, "CLONES"); |
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command_fail (si, fault::needmoreparams, _("Syntax: CLONES KLINE|LIST|ADDEXEMPT|DELEXEMPT|LISTEXEMPT [parameters]")); |
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return; |
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} |
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|
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c = os_clones_cmds.find (cmd); |
| 181 |
if (c == NULL) |
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{ |
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command_fail (si, fault::badparams, _("Invalid command. Use \2/%s%s help\2 for a command listing."), (ircd->uses_rcommand == false) ? "msg " : "", opersvs.me->disp); |
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return; |
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} |
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|
| 187 |
c->exec (si->service, si, parc + 1, parv + 1); |
| 188 |
} |
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|
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static void |
| 191 |
os_cmd_clones_kline (sourceinfo_t *si, int parc, char *parv[]) |
| 192 |
{ |
| 193 |
char const *arg = parv[0]; |
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|
| 195 |
if (arg == NULL) |
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arg = ""; |
| 197 |
|
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if (!strcasecmp (arg, "ON")) |
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{ |
| 200 |
if (kline_enabled) |
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{ |
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command_fail (si, fault::nochange, _("CLONES klines are already enabled.")); |
| 203 |
return; |
| 204 |
} |
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kline_enabled = true; |
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command_success_nodata (si, _("Enabled CLONES klines.")); |
| 207 |
wallops ("\2%s\2 enabled CLONES klines", get_oper_name (si)); |
| 208 |
snoop ("CLONES:KLINE:ON: \2%s\2", get_oper_name (si)); |
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logcommand (si, CMDLOG_ADMIN, "CLONES KLINE ON"); |
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write_exemptdb (); |
| 211 |
} |
| 212 |
else if (!strcasecmp (arg, "OFF")) |
| 213 |
{ |
| 214 |
if (!kline_enabled) |
| 215 |
{ |
| 216 |
command_fail (si, fault::nochange, _("CLONES klines are already disabled.")); |
| 217 |
return; |
| 218 |
} |
| 219 |
kline_enabled = false; |
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command_success_nodata (si, _("Disabled CLONES klines.")); |
| 221 |
wallops ("\2%s\2 disabled CLONES klines", get_oper_name (si)); |
| 222 |
snoop ("CLONES:KLINE:OFF: \2%s\2", get_oper_name (si)); |
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logcommand (si, CMDLOG_ADMIN, "CLONES KLINE OFF"); |
| 224 |
write_exemptdb (); |
| 225 |
} |
| 226 |
else |
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{ |
| 228 |
if (kline_enabled) |
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command_success_string (si, "ON", _("CLONES klines are currently enabled.")); |
| 230 |
else |
| 231 |
command_success_string (si, "OFF", _("CLONES klines are currently disabled.")); |
| 232 |
} |
| 233 |
} |
| 234 |
|
| 235 |
static void |
| 236 |
os_cmd_clones_list (sourceinfo_t *si, int parc, char *parv[]) |
| 237 |
{ |
| 238 |
hostentry_t *he; |
| 239 |
int k = 0; |
| 240 |
int allowed = 0; |
| 241 |
|
| 242 |
foreach (host_pair &hp, hostlist) |
| 243 |
{ |
| 244 |
he = hp.second; |
| 245 |
k = he->clients.size (); |
| 246 |
|
| 247 |
if (k > 3) |
| 248 |
{ |
| 249 |
if ((allowed = is_exempt (he->ip))) |
| 250 |
command_success_nodata (si, _("%d from %s (\2EXEMPT\2; allowed %d)"), k, he->ip, allowed); |
| 251 |
else |
| 252 |
command_success_nodata (si, _("%d from %s"), k, he->ip); |
| 253 |
} |
| 254 |
} |
| 255 |
|
| 256 |
command_success_nodata (si, _("End of CLONES LIST")); |
| 257 |
logcommand (si, CMDLOG_ADMIN, "CLONES LIST"); |
| 258 |
} |
| 259 |
|
| 260 |
static void |
| 261 |
os_cmd_clones_addexempt (sourceinfo_t *si, int parc, char *parv[]) |
| 262 |
{ |
| 263 |
char *ip = parv[0]; |
| 264 |
char *clonesstr = parv[1]; |
| 265 |
int clones; |
| 266 |
char *reason = parv[2]; |
| 267 |
cexcept_t *c = NULL; |
| 268 |
|
| 269 |
if (!ip || !clonesstr) |
| 270 |
{ |
| 271 |
command_fail (si, fault::needmoreparams, STR_INSUFFICIENT_PARAMS, "CLONES ADDEXEMPT"); |
| 272 |
command_fail (si, fault::needmoreparams, _("Syntax: CLONES ADDEXEMPT <ip> <clones> <reason>")); |
| 273 |
return; |
| 274 |
} |
| 275 |
|
| 276 |
clones = atoi (clonesstr); |
| 277 |
if (clones <= DEFAULT_WARN_CLONES) |
| 278 |
{ |
| 279 |
command_fail (si, fault::badparams, _("Allowed clones count must be more than %d"), DEFAULT_WARN_CLONES); |
| 280 |
return; |
| 281 |
} |
| 282 |
|
| 283 |
foreach (cexcept_t *t, clone_exempts) |
| 284 |
if (!strcmp (ip, t->ip)) |
| 285 |
c = t; |
| 286 |
|
| 287 |
if (c == NULL) |
| 288 |
{ |
| 289 |
if (!reason) |
| 290 |
{ |
| 291 |
command_fail (si, fault::needmoreparams, STR_INSUFFICIENT_PARAMS, "CLONES ADDEXEMPT"); |
| 292 |
command_fail (si, fault::needmoreparams, _("Syntax: CLONES ADDEXEMPT <ip> <clones> <reason>")); |
| 293 |
return; |
| 294 |
} |
| 295 |
c = new cexcept_t; |
| 296 |
c->ip = sstrdup (ip); |
| 297 |
c->reason = sstrdup (reason); |
| 298 |
clone_exempts.push_back (c); |
| 299 |
command_success_nodata (si, _("Added \2%s\2 to clone exempt list."), ip); |
| 300 |
} |
| 301 |
else |
| 302 |
{ |
| 303 |
if (reason) |
| 304 |
{ |
| 305 |
sfree (c->reason); |
| 306 |
c->reason = sstrdup (reason); |
| 307 |
} |
| 308 |
command_success_nodata (si, _("Updated \2%s\2 in clone exempt list."), ip); |
| 309 |
} |
| 310 |
c->clones = clones; |
| 311 |
|
| 312 |
snoop ("CLONES:ADDEXEMPT: \2%s\2 \2%d\2 (%s) by \2%s\2", ip, clones, c->reason, get_oper_name (si)); |
| 313 |
logcommand (si, CMDLOG_ADMIN, "CLONES ADDEXEMPT %s %d %s", ip, clones, c->reason); |
| 314 |
write_exemptdb (); |
| 315 |
} |
| 316 |
|
| 317 |
static void |
| 318 |
os_cmd_clones_delexempt (sourceinfo_t *si, int parc, char *parv[]) |
| 319 |
{ |
| 320 |
cexcept_t::vector_type::iterator it = clone_exempts.begin (); |
| 321 |
cexcept_t::vector_type::iterator et = clone_exempts.end (); |
| 322 |
char *arg = parv[0]; |
| 323 |
|
| 324 |
if (!arg) |
| 325 |
return; |
| 326 |
|
| 327 |
while (it != et) |
| 328 |
{ |
| 329 |
cexcept_t *c = *it; |
| 330 |
|
| 331 |
if (!strcmp (c->ip, arg)) |
| 332 |
{ |
| 333 |
sfree (c->ip); |
| 334 |
sfree (c->reason); |
| 335 |
delete c; |
| 336 |
clone_exempts.erase (it); |
| 337 |
command_success_nodata (si, _("Removed \2%s\2 from clone exempt list."), arg); |
| 338 |
snoop ("CLONES:DELEXEMPT: \2%s\2 by \2%s\2", arg, get_oper_name (si)); |
| 339 |
logcommand (si, CMDLOG_ADMIN, "CLONES DELEXEMPT %s", arg); |
| 340 |
write_exemptdb (); |
| 341 |
return; |
| 342 |
} |
| 343 |
|
| 344 |
++it; |
| 345 |
} |
| 346 |
|
| 347 |
command_fail (si, fault::nosuch_target, _("\2%s\2 not found in clone exempt list."), arg); |
| 348 |
} |
| 349 |
|
| 350 |
static void |
| 351 |
os_cmd_clones_listexempt (sourceinfo_t *si, int parc, char *parv[]) |
| 352 |
{ |
| 353 |
foreach (cexcept_t *c, clone_exempts) |
| 354 |
command_success_nodata (si, "%s (%d, %s)", c->ip, c->clones, c->reason); |
| 355 |
|
| 356 |
command_success_nodata (si, _("End of CLONES LISTEXEMPT")); |
| 357 |
logcommand (si, CMDLOG_ADMIN, "CLONES LISTEXEMPT"); |
| 358 |
} |
| 359 |
|
| 360 |
static void |
| 361 |
clones_newuser (user_t *u) |
| 362 |
{ |
| 363 |
unsigned i = 0; |
| 364 |
hostentry_t *he; |
| 365 |
host_map::iterator heit; |
| 366 |
unsigned allowed = 0; |
| 367 |
|
| 368 |
/* User has no IP, ignore him */ |
| 369 |
if (is_internal_client (u) || *u->ip == '\0') |
| 370 |
return; |
| 371 |
|
| 372 |
heit = hostlist.find (u->ip); |
| 373 |
if (heit == hostlist.end ()) |
| 374 |
{ |
| 375 |
he = new hostentry_t; |
| 376 |
strlcpy (he->ip, u->ip, sizeof he->ip); |
| 377 |
hostlist[he->ip] = he; |
| 378 |
} |
| 379 |
else |
| 380 |
he = heit->second; |
| 381 |
he->clients.push_back (u); |
| 382 |
i = he->clients.size (); |
| 383 |
|
| 384 |
if (i > DEFAULT_WARN_CLONES) |
| 385 |
{ |
| 386 |
allowed = is_exempt (u->ip); |
| 387 |
|
| 388 |
if (allowed == 0 || i > allowed) |
| 389 |
{ |
| 390 |
if (he->lastaction + 300 < NOW) |
| 391 |
he->lastaction_clones = i; |
| 392 |
else if (i <= he->lastaction_clones) |
| 393 |
return; |
| 394 |
else |
| 395 |
he->lastaction_clones = i; |
| 396 |
he->lastaction = NOW; |
| 397 |
if (allowed == 0 && i < config_options.default_clone_limit) |
| 398 |
snoop ("CLONES: %d clones on %s (%s!%s@%s)", i, u->ip, u->nick, u->user, u->host); |
| 399 |
else if (allowed != 0 && i < allowed + EXEMPT_GRACE) |
| 400 |
snoop ("CLONES: %d clones on %s (%s!%s@%s) (%d allowed)", i, u->ip, u->nick, u->user, u->host, allowed); |
| 401 |
else if (!kline_enabled) |
| 402 |
snoop ("CLONES: %d clones on %s (%s!%s@%s) (TKLINE disabled)", i, u->ip, u->nick, u->user, u->host); |
| 403 |
else |
| 404 |
{ |
| 405 |
snoop ("CLONES: %d clones on %s (%s!%s@%s) (TKLINE due to excess clones)", i, u->ip, u->nick, u->user, u->host); |
| 406 |
slog (LG_INFO, "clones_newuser(): klining *@%s (user %s!%s@%s)", u->ip, u->nick, u->user, u->host); |
| 407 |
phandler->kline_sts ("*", "*", u->ip, 3600, "Excessive clones"); |
| 408 |
} |
| 409 |
} |
| 410 |
} |
| 411 |
} |
| 412 |
|
| 413 |
static void |
| 414 |
clones_userquit (user_t *u) |
| 415 |
{ |
| 416 |
host_map::iterator heit; |
| 417 |
hostentry_t *he; |
| 418 |
|
| 419 |
/* User has no IP, ignore him */ |
| 420 |
if (is_internal_client (u) || *u->ip == '\0') |
| 421 |
return; |
| 422 |
|
| 423 |
heit = hostlist.find (u->ip); |
| 424 |
if (heit == hostlist.end ()) |
| 425 |
{ |
| 426 |
slog (LG_DEBUG, "clones_userquit(): hostentry for %s not found??", u->ip); |
| 427 |
return; |
| 428 |
} |
| 429 |
he = heit->second; |
| 430 |
|
| 431 |
user_t::vector_type::iterator it = find_element (u, he->clients); |
| 432 |
if (it != he->clients.end ()) |
| 433 |
{ |
| 434 |
he->clients.erase (it); |
| 435 |
if (he->clients.empty ()) |
| 436 |
{ |
| 437 |
hostlist.erase (he->ip); |
| 438 |
delete he; |
| 439 |
} |
| 440 |
} |
| 441 |
} |
| 442 |
|
| 443 |
static inline void |
| 444 |
clones_newuser_pair (user_t::pair_type &up) |
| 445 |
{ |
| 446 |
clones_newuser (up.second); |
| 447 |
} |
| 448 |
|
| 449 |
bool |
| 450 |
_modinit (module *m) |
| 451 |
{ |
| 452 |
os_cmdtree << os_clones; |
| 453 |
|
| 454 |
os_clones_cmds << os_clones_kline; |
| 455 |
os_clones_cmds << os_clones_list; |
| 456 |
os_clones_cmds << os_clones_addexempt; |
| 457 |
os_clones_cmds << os_clones_delexempt; |
| 458 |
os_clones_cmds << os_clones_listexempt; |
| 459 |
|
| 460 |
help_addentry (os_helptree, "CLONES", "help/operserv/clones", NULL); |
| 461 |
|
| 462 |
user_t::callback.add.attach (clones_newuser); |
| 463 |
user_t::callback.remove.attach (clones_userquit); |
| 464 |
|
| 465 |
load_exemptdb (); |
| 466 |
|
| 467 |
/* add everyone to host hash */ |
| 468 |
std::for_each (user_t::map.begin (), user_t::map.end (), clones_newuser_pair); |
| 469 |
|
| 470 |
return true; |
| 471 |
} |
| 472 |
|
| 473 |
void |
| 474 |
_moddeinit (void) |
| 475 |
{ |
| 476 |
foreach (host_pair &hp, hostlist) |
| 477 |
delete hp.second; |
| 478 |
|
| 479 |
while (!clone_exempts.empty ()) |
| 480 |
{ |
| 481 |
cexcept_t *c = clone_exempts.back (); |
| 482 |
|
| 483 |
sfree (c->ip); |
| 484 |
sfree (c->reason); |
| 485 |
delete c; |
| 486 |
|
| 487 |
clone_exempts.pop_back (); |
| 488 |
} |
| 489 |
|
| 490 |
os_cmdtree >> os_clones; |
| 491 |
|
| 492 |
os_clones_cmds >> os_clones_kline; |
| 493 |
os_clones_cmds >> os_clones_list; |
| 494 |
os_clones_cmds >> os_clones_addexempt; |
| 495 |
os_clones_cmds >> os_clones_delexempt; |
| 496 |
os_clones_cmds >> os_clones_listexempt; |
| 497 |
|
| 498 |
help_delentry (os_helptree, "CLONES"); |
| 499 |
|
| 500 |
user_t::callback.add.detach (clones_newuser); |
| 501 |
user_t::callback.remove.detach (clones_userquit); |
| 502 |
} |
