mirror of https://github.com/pissnet/pissircd.git
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
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* Extended ban to ban/exempt by certificate fingerprint (+b ~S:certfp)
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* (C) Copyright 2015 The UnrealIRCd Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "unrealircd.h"
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ModuleHeader MOD_HEADER
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= {
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"extbans/certfp",
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"4.2",
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"ExtBan ~S - Ban/exempt by SHA256 TLS certificate fingerprint",
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"UnrealIRCd Team",
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"unrealircd-6",
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};
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/* Forward declarations */
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int extban_certfp_is_ok(BanContext *b);
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const char *extban_certfp_conv_param(BanContext *b, Extban *extban);
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int extban_certfp_is_banned(BanContext *b);
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Extban *register_certfp_extban(ModuleInfo *modinfo)
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{
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ExtbanInfo req;
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memset(&req, 0, sizeof(req));
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req.letter = 'S';
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req.name = "certfp";
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req.is_ok = extban_certfp_is_ok;
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req.conv_param = extban_certfp_conv_param;
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req.is_banned = extban_certfp_is_banned;
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req.is_banned_events = BANCHK_ALL|BANCHK_TKL;
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req.options = EXTBOPT_INVEX|EXTBOPT_TKL;
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return ExtbanAdd(modinfo->handle, req);
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}
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/* Called upon module test */
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MOD_TEST()
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{
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if (!register_certfp_extban(modinfo))
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{
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config_error("could not register extended ban type");
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return MOD_FAILED;
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}
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return MOD_SUCCESS;
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}
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/* Called upon module init */
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MOD_INIT()
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{
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if (!register_certfp_extban(modinfo))
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{
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config_error("could not register extended ban type");
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return MOD_FAILED;
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}
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MARK_AS_OFFICIAL_MODULE(modinfo);
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return MOD_SUCCESS;
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}
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/* Called upon module load */
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MOD_LOAD()
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{
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return MOD_SUCCESS;
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}
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/* Called upon unload */
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MOD_UNLOAD()
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{
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return MOD_SUCCESS;
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}
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#define CERT_FP_LEN 64
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int extban_certfp_usage(Client *client)
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{
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sendnotice(client, "ERROR: ExtBan ~S expects an SHA256 fingerprint in hexadecimal format (no colons). "
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"For example: +e ~S:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef)");
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return EX_DENY;
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}
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int extban_certfp_is_ok(BanContext *b)
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{
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if (b->is_ok_check == EXCHK_PARAM)
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{
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const char *p;
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if (strlen(b->banstr) != CERT_FP_LEN)
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return extban_certfp_usage(b->client);
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for (p = b->banstr; *p; p++)
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if (!isxdigit(*p))
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return extban_certfp_usage(b->client);
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return EX_ALLOW;
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}
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return EX_ALLOW;
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}
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/* Obtain targeted certfp from the ban string */
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const char *extban_certfp_conv_param(BanContext *b, Extban *extban)
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{
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static char retbuf[EVP_MAX_MD_SIZE * 2 + 1];
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char *p;
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strlcpy(retbuf, b->banstr, sizeof(retbuf));
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for (p = retbuf; *p; p++)
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{
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*p = tolower(*p);
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}
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return retbuf;
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}
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int extban_certfp_is_banned(BanContext *b)
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{
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const char *fp = moddata_client_get(b->client, "certfp");
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if (!fp)
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return 0; /* not using TLS */
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if (!strcmp(b->banstr, fp))
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return 1;
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return 0;
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}
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