fishlim: Add /keyx for DH1080 key exchange
Losely based upon work from PR #1440 Fixes #653
This commit is contained in:
Patrick Griffis
parent
65abf5c532
commit
dba19a961b
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@ -1,9 +1,9 @@
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EXTRA_DIST = INSTALL LICENSE fish.h irc.h keystore.h plugin_hexchat.h
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EXTRA_DIST = INSTALL LICENSE fish.h irc.h keystore.h plugin_hexchat.h dh1080.h
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libdir = $(hexchatlibdir)
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lib_LTLIBRARIES = fishlim.la
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fishlim_la_SOURCES = fish.c irc.c keystore.c plugin_hexchat.c
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fishlim_la_SOURCES = fish.c irc.c keystore.c plugin_hexchat.c dh1080.c
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fishlim_la_LDFLAGS = $(PLUGIN_LDFLAGS) -module
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fishlim_la_LIBADD = $(GLIB_LIBS) $(OPENSSL_LIBS)
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fishlim_la_CPPFLAGS = -I$(top_srcdir)/src/common
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@ -0,0 +1,209 @@
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/* HexChat
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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 2 of the License, or
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* (at your option) 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* For Diffie-Hellman key-exchange a 1080bit germain prime is used, the
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* generator g=2 renders a field Fp from 1 to p-1. Therefore breaking it
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* means to solve a discrete logarithm problem with no less than 1080bit.
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*
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* Base64 format is used to send the public keys over IRC.
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*
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* The calculated secret key is hashed with SHA-256, the result is converted
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* to base64 for final use with blowfish.
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*/
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#include "dh1080.h"
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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#include <openssl/sha.h>
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#include <string.h>
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#include <glib.h>
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#define DH1080_PRIME_BITS 1080
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#define DH1080_PRIME_BYTES 135
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#define SHA256_DIGEST_LENGTH 32
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#define B64ABC "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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#define MEMZERO(x) memset(x, 0x00, (sizeof(x)/sizeof(*x)) )
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/* All clients must use the same prime number to be able to keyx */
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static const guchar prime1080[DH1080_PRIME_BYTES] =
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{
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0xFB, 0xE1, 0x02, 0x2E, 0x23, 0xD2, 0x13, 0xE8, 0xAC, 0xFA, 0x9A, 0xE8, 0xB9, 0xDF, 0xAD, 0xA3, 0xEA,
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0x6B, 0x7A, 0xC7, 0xA7, 0xB7, 0xE9, 0x5A, 0xB5, 0xEB, 0x2D, 0xF8, 0x58, 0x92, 0x1F, 0xEA, 0xDE, 0x95,
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0xE6, 0xAC, 0x7B, 0xE7, 0xDE, 0x6A, 0xDB, 0xAB, 0x8A, 0x78, 0x3E, 0x7A, 0xF7, 0xA7, 0xFA, 0x6A, 0x2B,
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0x7B, 0xEB, 0x1E, 0x72, 0xEA, 0xE2, 0xB7, 0x2F, 0x9F, 0xA2, 0xBF, 0xB2, 0xA2, 0xEF, 0xBE, 0xFA, 0xC8,
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0x68, 0xBA, 0xDB, 0x3E, 0x82, 0x8F, 0xA8, 0xBA, 0xDF, 0xAD, 0xA3, 0xE4, 0xCC, 0x1B, 0xE7, 0xE8, 0xAF,
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0xE8, 0x5E, 0x96, 0x98, 0xA7, 0x83, 0xEB, 0x68, 0xFA, 0x07, 0xA7, 0x7A, 0xB6, 0xAD, 0x7B, 0xEB, 0x61,
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0x8A, 0xCF, 0x9C, 0xA2, 0x89, 0x7E, 0xB2, 0x8A, 0x61, 0x89, 0xEF, 0xA0, 0x7A, 0xB9, 0x9A, 0x8A, 0x7F,
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0xA9, 0xAE, 0x29, 0x9E, 0xFA, 0x7B, 0xA6, 0x6D, 0xEA, 0xFE, 0xFB, 0xEF, 0xBF, 0x0B, 0x7D, 0x8B
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};
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static DH *g_dh;
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int
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dh1080_init (void)
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{
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g_return_val_if_fail (g_dh == NULL, 0);
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if ((g_dh = DH_new()))
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{
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int codes;
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g_dh->p = BN_bin2bn (prime1080, DH1080_PRIME_BYTES, NULL);
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g_dh->g = BN_new ();
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g_assert (g_dh->p != NULL && g_dh->g != NULL);
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BN_set_word(g_dh->g, 2);
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if (DH_check (g_dh, &codes))
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return codes == 0;
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}
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return 0;
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}
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void
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dh1080_deinit (void)
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{
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g_clear_pointer (&g_dh, DH_free);
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}
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static inline int
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DH_verifyPubKey (BIGNUM *pk)
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{
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int codes;
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return DH_check_pub_key (g_dh, pk, &codes) && codes == 0;
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}
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static guchar *
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dh1080_decode_b64 (const char *data, gsize *out_len)
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{
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GString *str = g_string_new (data);
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guchar *ret;
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if (str->len % 4 == 1 && str->str[str->len - 1] == 'A')
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g_string_truncate (str, str->len - 1);
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while (str->len % 4 != 0)
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g_string_append_c (str, '=');
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ret = g_base64_decode_inplace (str->str, out_len);
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g_string_free (str, FALSE);
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return ret;
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}
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static char *
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dh1080_encode_b64 (const guchar *data, gsize data_len)
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{
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char *ret = g_base64_encode (data, data_len);
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char *p;
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if (!(p = strchr (ret, '=')))
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{
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char *new_ret = g_new(char, strlen(ret) + 2);
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strcpy (new_ret, ret);
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strcat (new_ret, "A");
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g_free (ret);
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ret = new_ret;
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}
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else
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{
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*p = '\0';
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}
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return ret;
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}
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int
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dh1080_generate_key (char **priv_key, char **pub_key)
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{
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guchar buf[DH1080_PRIME_BYTES];
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int len;
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DH *dh;
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g_assert (priv_key != NULL);
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g_assert (pub_key != NULL);
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dh = DHparams_dup (g_dh);
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if (!dh)
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return 0;
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if (!DH_generate_key (dh))
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{
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DH_free (dh);
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return 0;
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}
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MEMZERO (buf);
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len = BN_bn2bin (dh->priv_key, buf);
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*priv_key = dh1080_encode_b64 (buf, len);
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MEMZERO (buf);
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len = BN_bn2bin(dh->pub_key, buf);
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*pub_key = dh1080_encode_b64 (buf, len);
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OPENSSL_cleanse (buf, sizeof (buf));
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DH_free (dh);
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return 1;
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}
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int
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dh1080_compute_key (const char *priv_key, const char *pub_key, char **secret_key)
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{
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char *pub_key_data;
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gsize pub_key_len;
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BIGNUM *pk;
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DH *dh;
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g_assert (secret_key != NULL);
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/* Verify base64 strings */
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if (strspn (priv_key, B64ABC) != strlen (priv_key)
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|| strspn (pub_key, B64ABC) != strlen (pub_key))
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return 0;
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dh = DHparams_dup (g_dh);
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pub_key_data = dh1080_decode_b64 (pub_key, &pub_key_len);
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pk = BN_bin2bn (pub_key_data, pub_key_len, NULL);
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if (DH_verifyPubKey (pk))
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{
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guchar shared_key[DH1080_PRIME_BYTES] = { 0 };
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guchar sha256[SHA256_DIGEST_LENGTH] = { 0 };
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char *priv_key_data;
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gsize priv_key_len;
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int shared_len;
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priv_key_data = dh1080_decode_b64 (priv_key, &priv_key_len);
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dh->priv_key = BN_bin2bn(priv_key_data, priv_key_len, NULL);
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shared_len = DH_compute_key (shared_key, pk, dh);
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SHA256(shared_key, shared_len, sha256);
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*secret_key = dh1080_encode_b64 (sha256, sizeof(sha256));
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OPENSSL_cleanse (priv_key_data, priv_key_len);
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g_free (priv_key_data);
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}
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BN_free (pk);
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DH_free (dh);
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g_free (pub_key_data);
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return 1;
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}
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@ -0,0 +1,24 @@
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/* HexChat
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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 2 of the License, or
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* (at your option) 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#pragma once
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int dh1080_generate_key (char **, char **);
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int dh1080_compute_key (const char *, const char *, char **);
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int dh1080_init (void);
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void dh1080_deinit (void);
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@ -53,13 +53,14 @@
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<None Include="fishlim.def" />
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="bool.h" />
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<ClInclude Include="dh1080.h" />
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<ClInclude Include="fish.h" />
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<ClInclude Include="irc.h" />
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<ClInclude Include="keystore.h" />
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<ClInclude Include="plugin_hexchat.h" />
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="dh1080.c" />
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<ClCompile Include="fish.c" />
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<ClCompile Include="irc.c" />
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<ClCompile Include="keystore.c" />
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@ -50,7 +50,9 @@ gboolean irc_parse_message(const char *words[],
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if (command) *command = words[w];
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w++;
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if (parameters_offset)
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*parameters_offset = w;
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return TRUE;
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}
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@ -32,6 +32,7 @@
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#define HEXCHAT_MAX_WORDS 32
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#include "fish.h"
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#include "dh1080.h"
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#include "keystore.h"
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#include "irc.h"
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@ -41,8 +42,11 @@ static const char plugin_version[] = "0.0.17";
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static const char usage_setkey[] = "Usage: SETKEY [<nick or #channel>] <password>, sets the key for a channel or nick";
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static const char usage_delkey[] = "Usage: DELKEY <nick or #channel>, deletes the key for a channel or nick";
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static const char usage_keyx[] = "Usage: KEYX [<nick>], performs DH1080 key-exchange with <nick>";
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static hexchat_plugin *ph;
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static GHashTable *pending_exchanges;
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/**
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@ -58,6 +62,38 @@ gchar *get_config_filename(void) {
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return filename_fs;
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}
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static inline gboolean irc_is_query (const char *name) {
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const char *chantypes = hexchat_list_str (ph, NULL, "chantypes");
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return strchr (chantypes, name[0]) == NULL;
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}
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static hexchat_context *find_context_on_network (const char *name) {
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hexchat_list *channels;
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hexchat_context *ret = NULL;
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int id;
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if (hexchat_get_prefs(ph, "id", NULL, &id) != 2)
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return NULL;
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channels = hexchat_list_get(ph, "channels");
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if (!channels)
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return NULL;
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while (hexchat_list_next(ph, channels)) {
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int chan_id = hexchat_list_int(ph, channels, "id");
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const char *chan_name = hexchat_list_str(ph, channels, "channel");
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if (chan_id == id && chan_name && hexchat_nickcmp (ph, chan_name, name) == 0) {
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ret = (hexchat_context*)hexchat_list_str(ph, channels, "context");
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break;
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}
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};
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hexchat_list_free(ph, channels);
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return ret;
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}
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int irc_nick_cmp(const char *a, const char *b) {
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return hexchat_nickcmp (ph, a, b);
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}
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@ -191,6 +227,83 @@ static int handle_incoming(char *word[], char *word_eol[], hexchat_event_attrs *
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return HEXCHAT_EAT_NONE;
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}
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static int handle_keyx_notice(char *word[], char *word_eol[], void *userdata) {
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const char *dh_message = word[4];
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const char *dh_pubkey = word[5];
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hexchat_context *query_ctx;
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const char *prefix;
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gboolean cbc;
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char *sender, *secret_key, *priv_key = NULL;
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if (!*dh_message || !*dh_pubkey || strlen(dh_pubkey) != 181)
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return HEXCHAT_EAT_NONE;
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if (!irc_parse_message((const char**)word, &prefix, NULL, NULL) || !prefix)
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return HEXCHAT_EAT_NONE;
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sender = irc_prefix_get_nick(prefix);
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query_ctx = find_context_on_network(sender);
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if (query_ctx)
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hexchat_set_context(ph, query_ctx);
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dh_message++; /* : prefix */
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if (*dh_message == '+' || *dh_message == '-')
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dh_message++; /* identify-msg */
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cbc = g_strcmp0 (word[6], "CBC") == 0;
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if (!strcmp(dh_message, "DH1080_INIT")) {
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char *pub_key;
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if (cbc) {
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hexchat_print(ph, "Recieved key exchange for CBC mode which is not supported.");
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goto cleanup;
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}
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hexchat_printf(ph, "Received public key from %s, sending mine...", sender);
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if (dh1080_generate_key(&priv_key, &pub_key)) {
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hexchat_commandf(ph, "quote NOTICE %s :DH1080_FINISH %s", sender, pub_key);
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g_free(pub_key);
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} else {
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hexchat_print(ph, "Failed to generate keys");
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goto cleanup;
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}
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} else if (!strcmp (dh_message, "DH1080_FINISH")) {
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char *sender_lower = g_ascii_strdown(sender, -1);
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/* FIXME: Properly respect irc casing */
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priv_key = g_hash_table_lookup(pending_exchanges, sender_lower);
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g_hash_table_steal(pending_exchanges, sender_lower);
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g_free(sender_lower);
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if (cbc) {
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hexchat_print(ph, "Recieved key exchange for CBC mode which is not supported.");
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goto cleanup;
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}
|
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|
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if (!priv_key) {
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hexchat_printf(ph, "Recieved a key exchange response for unknown user: %s", sender);
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goto cleanup;
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}
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} else {
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/* Regular notice */
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g_free(sender);
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return HEXCHAT_EAT_NONE;
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}
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if (dh1080_compute_key(priv_key, dh_pubkey, &secret_key)) {
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keystore_store_key(sender, secret_key);
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hexchat_printf(ph, "Stored new key for %s", sender);
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g_free(secret_key);
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} else {
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hexchat_print(ph, "Failed to create secret key!");
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}
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cleanup:
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g_free(sender);
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g_free(priv_key);
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return HEXCHAT_EAT_ALL;
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}
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/**
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* Command handler for /setkey
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*/
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@ -248,6 +361,43 @@ static int handle_delkey(char *word[], char *word_eol[], void *userdata) {
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return HEXCHAT_EAT_HEXCHAT;
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}
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static int handle_keyx(char *word[], char *word_eol[], void *userdata) {
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const char *target = word[2];
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hexchat_context *query_ctx = NULL;
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char *pub_key, *priv_key;
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int ctx_type;
|
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if (*target)
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query_ctx = find_context_on_network(target);
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else {
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target = hexchat_get_info(ph, "channel");
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query_ctx = hexchat_get_context (ph);
|
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}
|
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|
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if (query_ctx) {
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hexchat_set_context(ph, query_ctx);
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ctx_type = hexchat_list_int(ph, NULL, "type");
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}
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if ((query_ctx && ctx_type != 3) || (!query_ctx && !irc_is_query(target))) {
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hexchat_print(ph, "You can only exchange keys with individuals");
|
||||
return HEXCHAT_EAT_ALL;
|
||||
}
|
||||
|
||||
if (dh1080_generate_key(&priv_key, &pub_key)) {
|
||||
g_hash_table_replace (pending_exchanges, g_ascii_strdown(target, -1), priv_key);
|
||||
|
||||
hexchat_commandf(ph, "quote NOTICE %s :DH1080_INIT %s", target, pub_key);
|
||||
hexchat_printf(ph, "Sent public key to %s, waiting for reply...", target);
|
||||
|
||||
g_free(pub_key);
|
||||
} else {
|
||||
hexchat_print(ph, "Failed to generate keys");
|
||||
}
|
||||
|
||||
return HEXCHAT_EAT_ALL;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the plugin name version information.
|
||||
*/
|
||||
|
|
@ -276,21 +426,31 @@ int hexchat_plugin_init(hexchat_plugin *plugin_handle,
|
|||
/* Register commands */
|
||||
hexchat_hook_command(ph, "SETKEY", HEXCHAT_PRI_NORM, handle_setkey, usage_setkey, NULL);
|
||||
hexchat_hook_command(ph, "DELKEY", HEXCHAT_PRI_NORM, handle_delkey, usage_delkey, NULL);
|
||||
hexchat_hook_command(ph, "KEYX", HEXCHAT_PRI_NORM, handle_keyx, usage_keyx, NULL);
|
||||
|
||||
/* Add handlers */
|
||||
hexchat_hook_command(ph, "", HEXCHAT_PRI_NORM, handle_outgoing, NULL, NULL);
|
||||
hexchat_hook_server(ph, "NOTICE", HEXCHAT_PRI_HIGHEST, handle_keyx_notice, NULL);
|
||||
hexchat_hook_server_attrs(ph, "NOTICE", HEXCHAT_PRI_NORM, handle_incoming, NULL);
|
||||
hexchat_hook_server_attrs(ph, "PRIVMSG", HEXCHAT_PRI_NORM, handle_incoming, NULL);
|
||||
/* hexchat_hook_server(ph, "RAW LINE", HEXCHAT_PRI_NORM, handle_debug, NULL); */
|
||||
hexchat_hook_server_attrs(ph, "TOPIC", HEXCHAT_PRI_NORM, handle_incoming, NULL);
|
||||
hexchat_hook_server_attrs(ph, "332", HEXCHAT_PRI_NORM, handle_incoming, NULL);
|
||||
|
||||
if (!dh1080_init())
|
||||
return 0;
|
||||
|
||||
pending_exchanges = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
|
||||
|
||||
hexchat_printf(ph, "%s plugin loaded\n", plugin_name);
|
||||
/* Return success */
|
||||
return 1;
|
||||
}
|
||||
|
||||
int hexchat_plugin_deinit(void) {
|
||||
g_clear_pointer(&pending_exchanges, g_hash_table_destroy);
|
||||
dh1080_deinit();
|
||||
|
||||
hexchat_printf(ph, "%s plugin unloaded\n", plugin_name);
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue