dnl These are defined in files in m4/
-AM_PATH_LIBGCRYPT([], [], [AC_MSG_ERROR([Libgcrypt not found.]); break])
+AC_ARG_WITH(libgcrypt, AC_HELP_STRING([--with-libgcrypt], [enable use of libgcrypt instead of OpenSSL])], [])
+
+AM_PATH_LIBGCRYPT([], [], [])
tinc_OPENSSL
tinc_ZLIB
tinc_LZO
+if test "$with_libgcrypt" = yes; then
+ AC_MSG_ERROR([Libgcrypt support not fully implemented yet.]);
+ break;
+else
+ ln -sf openssl/crypto.c openssl/crypto.h openssl/cipher.c openssl/cipher.h openssl/digest.c openssl/digest.h openssl/rsa.c openssl/rsa.h src/
+fi
+
+
dnl Check if support for jumbograms is requested
AC_ARG_ENABLE(jumbograms,
AS_HELP_STRING([--enable-jumbograms], [enable support for jumbograms (packets up to 9000 bytes)]),
EXTRA_DIST = linux/device.c bsd/device.c solaris/device.c cygwin/device.c mingw/device.c mingw/common.h raw_socket/device.c uml_socket/device.c
-tincd_SOURCES = conf.c connection.c control.c edge.c graph.c logger.c meta.c net.c net_packet.c net_setup.c \
+tincd_SOURCES = cipher.c conf.c connection.c control.c crypto.c digest.c edge.c graph.c logger.c meta.c net.c net_packet.c net_setup.c \
net_socket.c netutl.c node.c process.c protocol.c protocol_auth.c protocol_edge.c protocol_misc.c \
protocol_key.c protocol_subnet.c route.c rsa.c subnet.c tincd.c
INCLUDES = @INCLUDES@ -I$(top_builddir) -I$(top_srcdir)/lib
-noinst_HEADERS = conf.h connection.h control.h device.h edge.h graph.h logger.h meta.h net.h netutl.h node.h process.h \
+noinst_HEADERS = cipher.h conf.h connection.h control.h crypto.h device.h digest.h edge.h graph.h logger.h meta.h net.h netutl.h node.h process.h \
protocol.h route.h rsa.h subnet.h
LIBS = @LIBS@ @LIBINTL@
tincd_LDADD = \
- $(top_builddir)/lib/libvpn.a \
- $(LIBGCRYPT_LIBS)
+ $(top_builddir)/lib/libvpn.a
tincctl_LDADD = \
$(top_builddir)/lib/libvpn.a
localedir = $(datadir)/locale
AM_CFLAGS = @CFLAGS@ -DCONFDIR=\"$(sysconfdir)\" -DLOCALEDIR=\"$(localedir)\" -DLOCALSTATEDIR=\"$(localstatedir)\"
-tinc_CPPFLAGS = $(LIBGCRYPT_CFLAGS)
dist-hook:
rm -f `find . -type l`
+++ /dev/null
-/*
- cipher.c -- Symmetric block cipher handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#include "system.h"
-
-#include "cipher.h"
-#include "logger.h"
-#include "xalloc.h"
-
-static struct {
- const char *name;
- int algo;
- int mode;
- int nid;
-} ciphertable[] = {
- {"none", GCRY_CIPHER_NONE, GCRY_CIPHER_MODE_NONE, 0},
-
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_ECB, 92},
- {"blowfish", GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CBC, 91},
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CFB, 93},
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB, 94},
-
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 418},
- {"aes", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 419},
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 421},
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_OFB, 420},
-
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_ECB, 422},
- {"aes192", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC, 423},
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CFB, 425},
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_OFB, 424},
-
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, 426},
- {"aes256", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, 427},
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 429},
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, 428},
-};
-
-static bool nametocipher(const char *name, int *algo, int *mode) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(ciphertable[i].name && !strcasecmp(name, ciphertable[i].name)) {
- *algo = ciphertable[i].algo;
- *mode = ciphertable[i].mode;
- return true;
- }
- }
-
- return false;
-}
-
-static bool nidtocipher(int nid, int *algo, int *mode) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(nid == ciphertable[i].nid) {
- *algo = ciphertable[i].algo;
- *mode = ciphertable[i].mode;
- return true;
- }
- }
-
- return false;
-}
-
-static bool ciphertonid(int algo, int mode, int *nid) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(algo == ciphertable[i].algo && mode == ciphertable[i].mode) {
- *nid = ciphertable[i].nid;
- return true;
- }
- }
-
- return false;
-}
-
-static bool cipher_open(cipher_t *cipher, int algo, int mode) {
- gcry_error_t err;
-
- if(!ciphertonid(algo, mode, &cipher->nid)) {
- logger(LOG_DEBUG, _("Cipher %d mode %d has no corresponding nid!"), algo, mode);
- return false;
- }
-
- if((err = gcry_cipher_open(&cipher->handle, algo, mode, 0))) {
- logger(LOG_DEBUG, _("Unable to intialise cipher %d mode %d!"), algo, mode);
- return false;
- }
-
- cipher->keylen = gcry_cipher_get_algo_keylen(algo);
- if(mode == GCRY_CIPHER_MODE_ECB || mode == GCRY_CIPHER_MODE_CBC)
- cipher->blklen = gcry_cipher_get_algo_blklen(algo);
- else
- cipher->blklen = 0;
- cipher->key = xmalloc(cipher->keylen + cipher->blklen);
-
- return true;
-}
-
-bool cipher_open_by_name(cipher_t *cipher, const char *name) {
- int algo, mode;
-
- if(!nametocipher(name, &algo, &mode)) {
- logger(LOG_DEBUG, _("Unknown cipher name '%s'!"), name);
- return false;
- }
-
- return cipher_open(cipher, algo, mode);
-}
-
-bool cipher_open_by_nid(cipher_t *cipher, int nid) {
- int algo, mode;
-
- if(!nidtocipher(nid, &algo, &mode)) {
- logger(LOG_DEBUG, _("Unknown cipher ID %d!"), nid);
- return false;
- }
-
- return cipher_open(cipher, algo, mode);
-}
-
-bool cipher_open_blowfish_ofb(cipher_t *cipher) {
- return cipher_open(cipher, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB);
-}
-
-void cipher_close(cipher_t *cipher) {
- if(cipher->handle) {
- gcry_cipher_close(cipher->handle);
- cipher->handle = NULL;
- }
-
- if(cipher->key) {
- free(cipher->key);
- cipher->key = NULL;
- }
-}
-
-size_t cipher_keylength(const cipher_t *cipher) {
- return cipher->keylen + cipher->blklen;
-}
-
-void cipher_get_key(const cipher_t *cipher, void *key) {
- memcpy(key, cipher->key, cipher->keylen + cipher->blklen);
-}
-
-bool cipher_set_key(cipher_t *cipher, void *key) {
- memcpy(cipher->key, key, cipher->keylen + cipher->blklen);
-
- gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
- gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
-
- return true;
-}
-
-bool cipher_regenerate_key(cipher_t *cipher) {
- gcry_create_nonce(cipher->key, cipher->keylen + cipher->blklen);
-
- gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
- gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
-
- return true;
-}
-
-bool cipher_add_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
- size_t reqlen;
-
- if(cipher->blklen == 1) {
- *outlen = inlen;
- return true;
- }
-
- reqlen = ((inlen + 1) / cipher->blklen) * cipher->blklen;
- if(reqlen > *outlen)
- return false;
-
- // add padding
-
- *outlen = reqlen;
- return true;
-}
-
-bool cipher_remove_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
- size_t origlen;
-
- if(cipher->blklen == 1) {
- *outlen = inlen;
- return true;
- }
-
- if(inlen % cipher->blklen)
- return false;
-
- // check and remove padding
-
- *outlen = origlen;
- return true;
-}
-
-bool cipher_encrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen) {
- gcry_error_t err;
-
- if((err = gcry_cipher_encrypt(cipher->handle, outdata, inlen, indata, inlen))) {
- logger(LOG_ERR, _("Error while encrypting"));
- return false;
- }
-
- return true;
-}
-
-bool cipher_decrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen) {
- gcry_error_t err;
-
- if((err = gcry_cipher_decrypt(cipher->handle, outdata, inlen, indata, inlen))) {
- logger(LOG_ERR, _("Error while encrypting"));
- return false;
- }
-
- return true;
-}
-
-void cipher_reset(cipher_t *cipher) {
- gcry_cipher_reset(cipher->handle);
- gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
-}
-
-int cipher_get_nid(const cipher_t *cipher) {
- return cipher->nid;
-}
-
-bool cipher_active(const cipher_t *cipher) {
- return cipher->nid != 0;
-}
+++ /dev/null
-/*
- cipher.h -- header file cipher.c
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#ifndef __TINC_CIPHER_H__
-#define __TINC_CIPHER_H__
-
-#include <gcrypt.h>
-
-typedef struct cipher {
- gcry_cipher_hd_t handle;
- char *key;
- int nid;
- uint16_t keylen;
- uint16_t blklen;
-} cipher_t;
-
-extern bool cipher_open_by_name(struct cipher *, const char *);
-extern bool cipher_open_by_nid(struct cipher *, int);
-extern bool cipher_open_blowfish_ofb(struct cipher *);
-extern void cipher_close(struct cipher *);
-extern size_t cipher_keylength(const struct cipher *);
-extern void cipher_get_key(const struct cipher *, void *);
-extern bool cipher_set_key(struct cipher *, void *);
-extern bool cipher_regenerate_key(struct cipher *);
-extern void cipher_reset(struct cipher *);
-extern bool cipher_encrypt(struct cipher *, void *indata, size_t inlen, void *outdata, size_t *outlen);
-extern bool cipher_decrypt(struct cipher *, void *indata, size_t inlen, void *outdata, size_t *outlen);
-extern int cipher_get_nid(const struct cipher *);
-extern bool cipher_active(const struct cipher *);
-
-#endif
#include "system.h"
#include "splay_tree.h"
+#include "cipher.h"
#include "conf.h"
#include "list.h"
#include "logger.h"
if(c->hostname)
free(c->hostname);
- if(c->inkey)
- free(c->inkey);
-
- if(c->outkey)
- free(c->outkey);
-
- if(c->mychallenge)
- free(c->mychallenge);
+ cipher_close(&c->incipher);
+ cipher_close(&c->outcipher);
if(c->hischallenge)
free(c->hischallenge);
#ifndef __TINC_CONNECTION_H__
#define __TINC_CONNECTION_H__
-//#include <openssl/rsa.h>
-#include <openssl/evp.h>
-
#include <event.h>
+#include "cipher.h"
+#include "digest.h"
#include "rsa.h"
#include "splay_tree.h"
struct node_t *node; /* node associated with the other end */
struct edge_t *edge; /* edge associated with this connection */
- //RSA *rsa_key; /* his public/private key */
- struct rsa_key_t rsa_key; /* his public/private key */
- const EVP_CIPHER *incipher; /* Cipher he will use to send data to us */
- const EVP_CIPHER *outcipher; /* Cipher we will use to send data to him */
- EVP_CIPHER_CTX *inctx; /* Context of encrypted meta data that will come from him to us */
- EVP_CIPHER_CTX *outctx; /* Context of encrypted meta data that will be sent from us to him */
- char *inkey; /* His symmetric meta key + iv */
- char *outkey; /* Our symmetric meta key + iv */
- int inkeylength; /* Length of his key + iv */
- int outkeylength; /* Length of our key + iv */
- const EVP_MD *indigest;
- const EVP_MD *outdigest;
+ rsa_t rsa; /* his public/private key */
+ cipher_t incipher; /* Cipher he will use to send data to us */
+ cipher_t outcipher; /* Cipher we will use to send data to him */
+ digest_t indigest;
+ digest_t outdigest;
+
int inmaclength;
int outmaclength;
int incompression;
int outcompression;
- char *mychallenge; /* challenge we received from him */
- char *hischallenge; /* challenge we sent to him */
+
+ char *hischallenge; /* The challenge we sent to him */
struct bufferevent *buffer; /* buffer events on this metadata connection */
struct event inevent; /* input event on this metadata connection */
+++ /dev/null
-/*
- digest.c -- Digest handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#include "system.h"
-
-#include "digest.h"
-#include "logger.h"
-
-static struct {
- const char *name;
- int algo;
- int nid;
-} digesttable[] = {
- {"none", GCRY_MD_NONE, 0},
- {"sha1", GCRY_MD_SHA1, 64},
- {"sha256", GCRY_MD_SHA256, 672},
- {"sha384", GCRY_MD_SHA384, 673},
- {"sha512", GCRY_MD_SHA512, 674},
-};
-
-static bool nametodigest(const char *name, int *algo) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(digesttable[i].name && !strcasecmp(name, digesttable[i].name)) {
- *algo = digesttable[i].algo;
- return true;
- }
- }
-
- return false;
-}
-
-static bool nidtodigest(int nid, int *algo) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(nid == digesttable[i].nid) {
- *algo = digesttable[i].algo;
- return true;
- }
- }
-
- return false;
-}
-
-static bool digesttonid(int algo, int *nid) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(algo == digesttable[i].algo) {
- *nid = digesttable[i].nid;
- return true;
- }
- }
-
- return false;
-}
-
-static bool digest_open(digest_t *digest, int algo) {
- if(!digesttonid(algo, &digest->nid)) {
- logger(LOG_DEBUG, _("Digest %d has no corresponding nid!"), algo);
- return false;
- }
-
- digest->len = gcry_md_get_algo_dlen(algo);
-
- return true;
-}
-
-bool digest_open_by_name(digest_t *digest, const char *name) {
- int algo;
-
- if(!nametodigest(name, &algo)) {
- logger(LOG_DEBUG, _("Unknown digest name '%s'!"), name);
- return false;
- }
-
- return digest_open(digest, algo);
-}
-
-bool digest_open_by_nid(digest_t *digest, int nid) {
- int algo;
-
- if(!nidtodigest(nid, &algo)) {
- logger(LOG_DEBUG, _("Unknown digest ID %d!"), nid);
- return false;
- }
-
- return digest_open(digest, algo);
-}
-
-bool digest_open_sha1(digest_t *digest) {
- return digest_open(digest, GCRY_MD_SHA1);
-}
-
-void digest_close(digest_t *digest) {
-}
-
-bool digest_create(digest_t *digest, void *indata, size_t inlen, void *outdata) {
- gcry_md_hash_buffer(digest->algo, outdata, indata, inlen);
- return true;
-}
-
-bool digest_verify(digest_t *digest, void *indata, size_t inlen, void *cmpdata) {
- char outdata[digest->len];
-
- gcry_md_hash_buffer(digest->algo, outdata, indata, inlen);
- return !memcmp(indata, outdata, digest->len);
-}
-
-int digest_get_nid(const digest_t *digest) {
- return digest->nid;
-}
-
-size_t digest_length(const digest_t *digest) {
- return digest->len;
-}
-
-bool digest_active(const digest_t *digest) {
- return digest->algo != GCRY_MD_NONE;
-}
+++ /dev/null
-/*
- digest.h -- header file digest.c
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#ifndef __TINC_DIGEST_H__
-#define __TINC_DIGEST_H__
-
-#include <gcrypt.h>
-
-typedef struct digest {
- int algo;
- int nid;
- uint16_t len;
-} digest_t;
-
-bool digest_open_by_name(struct digest *, const char *);
-bool digest_open_by_nid(struct digest *, int);
-bool digest_open_sha1(struct digest *);
-void digest_close(struct digest *);
-bool digest_create(struct digest *, void *indata, size_t inlen, void *outdata);
-bool digest_verify(struct digest *, void *indata, size_t inlen, void *digestdata);
-int digest_get_nid(const struct digest *);
-size_t digest_length(const struct digest *);
-bool digest_active(const struct digest *);
-
-#endif
--- /dev/null
+/*
+ cipher.c -- Symmetric block cipher handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include "cipher.h"
+#include "logger.h"
+#include "xalloc.h"
+
+static struct {
+ const char *name;
+ int algo;
+ int mode;
+ int nid;
+} ciphertable[] = {
+ {"none", GCRY_CIPHER_NONE, GCRY_CIPHER_MODE_NONE, 0},
+
+ {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_ECB, 92},
+ {"blowfish", GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CBC, 91},
+ {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CFB, 93},
+ {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB, 94},
+
+ {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 418},
+ {"aes", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 419},
+ {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 421},
+ {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_OFB, 420},
+
+ {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_ECB, 422},
+ {"aes192", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC, 423},
+ {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CFB, 425},
+ {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_OFB, 424},
+
+ {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, 426},
+ {"aes256", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, 427},
+ {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 429},
+ {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, 428},
+};
+
+static bool nametocipher(const char *name, int *algo, int *mode) {
+ int i;
+
+ for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
+ if(ciphertable[i].name && !strcasecmp(name, ciphertable[i].name)) {
+ *algo = ciphertable[i].algo;
+ *mode = ciphertable[i].mode;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool nidtocipher(int nid, int *algo, int *mode) {
+ int i;
+
+ for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
+ if(nid == ciphertable[i].nid) {
+ *algo = ciphertable[i].algo;
+ *mode = ciphertable[i].mode;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool ciphertonid(int algo, int mode, int *nid) {
+ int i;
+
+ for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
+ if(algo == ciphertable[i].algo && mode == ciphertable[i].mode) {
+ *nid = ciphertable[i].nid;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool cipher_open(cipher_t *cipher, int algo, int mode) {
+ gcry_error_t err;
+
+ if(!ciphertonid(algo, mode, &cipher->nid)) {
+ logger(LOG_DEBUG, _("Cipher %d mode %d has no corresponding nid!"), algo, mode);
+ return false;
+ }
+
+ if((err = gcry_cipher_open(&cipher->handle, algo, mode, 0))) {
+ logger(LOG_DEBUG, _("Unable to intialise cipher %d mode %d: %s"), algo, mode, gcry_strerror(err));
+ return false;
+ }
+
+ cipher->keylen = gcry_cipher_get_algo_keylen(algo);
+ if(mode == GCRY_CIPHER_MODE_ECB || mode == GCRY_CIPHER_MODE_CBC)
+ cipher->blklen = gcry_cipher_get_algo_blklen(algo);
+ else
+ cipher->blklen = 0;
+ cipher->key = xmalloc(cipher->keylen + cipher->blklen);
+
+ return true;
+}
+
+bool cipher_open_by_name(cipher_t *cipher, const char *name) {
+ int algo, mode;
+
+ if(!nametocipher(name, &algo, &mode)) {
+ logger(LOG_DEBUG, _("Unknown cipher name '%s'!"), name);
+ return false;
+ }
+
+ return cipher_open(cipher, algo, mode);
+}
+
+bool cipher_open_by_nid(cipher_t *cipher, int nid) {
+ int algo, mode;
+
+ if(!nidtocipher(nid, &algo, &mode)) {
+ logger(LOG_DEBUG, _("Unknown cipher ID %d!"), nid);
+ return false;
+ }
+
+ return cipher_open(cipher, algo, mode);
+}
+
+bool cipher_open_blowfish_ofb(cipher_t *cipher) {
+ return cipher_open(cipher, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB);
+}
+
+void cipher_close(cipher_t *cipher) {
+ if(cipher->handle) {
+ gcry_cipher_close(cipher->handle);
+ cipher->handle = NULL;
+ }
+
+ if(cipher->key) {
+ free(cipher->key);
+ cipher->key = NULL;
+ }
+}
+
+size_t cipher_keylength(const cipher_t *cipher) {
+ return cipher->keylen + cipher->blklen;
+}
+
+void cipher_get_key(const cipher_t *cipher, void *key) {
+ memcpy(key, cipher->key, cipher->keylen + cipher->blklen);
+}
+
+bool cipher_set_key(cipher_t *cipher, void *key, bool encrypt) {
+ memcpy(cipher->key, key, cipher->keylen + cipher->blklen);
+
+ gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
+ gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
+
+ return true;
+}
+
+bool cipher_set_key(cipher_t *cipher, void *key, size_t len, bool encrypt) {
+ memcpy(cipher->key, key + len - cipher->keylen, cipher->keylen + cipher->blklen);
+ memcpy(cipher->key + cipher->keylen, key + len - cipher->keylen - cipher->blklen, cipher->blklen);
+
+ gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
+ gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
+
+ return true;
+}
+
+bool cipher_regenerate_key(cipher_t *cipher, bool encrypt) {
+ gcry_create_nonce(cipher->key, cipher->keylen + cipher->blklen);
+
+ gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
+ gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
+
+ return true;
+}
+
+static bool cipher_add_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
+ size_t reqlen;
+
+ if(cipher->blklen == 1) {
+ *outlen = inlen;
+ return true;
+ }
+
+ reqlen = ((inlen + 1) / cipher->blklen) * cipher->blklen;
+ if(reqlen > *outlen)
+ return false;
+
+ // add padding
+
+ *outlen = reqlen;
+ return true;
+}
+
+static bool cipher_remove_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
+ size_t origlen;
+
+ if(cipher->blklen == 1) {
+ *outlen = inlen;
+ return true;
+ }
+
+ if(inlen % cipher->blklen)
+ return false;
+
+ // check and remove padding
+
+ *outlen = origlen;
+ return true;
+}
+
+bool cipher_encrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) {
+ gcry_error_t err;
+
+ // To be fixed
+
+ if((err = gcry_cipher_encrypt(cipher->handle, outdata, inlen, indata, inlen))) {
+ logger(LOG_ERR, _("Error while encrypting: %s"), gcry_strerror(err));
+ return false;
+ }
+
+ return true;
+}
+
+bool cipher_decrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) {
+ gcry_error_t err;
+
+ // To be fixed
+
+ if((err = gcry_cipher_decrypt(cipher->handle, outdata, inlen, indata, inlen))) {
+ logger(LOG_ERR, _("Error while decrypting: %s"), gcry_strerror(err));
+ return false;
+ }
+
+ return true;
+}
+
+int cipher_get_nid(const cipher_t *cipher) {
+ return cipher->nid;
+}
+
+bool cipher_active(const cipher_t *cipher) {
+ return cipher->nid != 0;
+}
--- /dev/null
+/*
+ cipher.h -- header file cipher.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_CIPHER_H__
+#define __TINC_CIPHER_H__
+
+#include <gcrypt.h>
+
+typedef struct cipher {
+ gcry_cipher_hd_t handle;
+ char *key;
+ int nid;
+ uint16_t keylen;
+ uint16_t blklen;
+} cipher_t;
+
+extern bool cipher_open_by_name(struct cipher *, const char *);
+extern bool cipher_open_by_nid(struct cipher *, int);
+extern bool cipher_open_blowfish_ofb(struct cipher *);
+extern void cipher_close(struct cipher *);
+extern size_t cipher_keylength(const struct cipher *);
+extern void cipher_get_key(const struct cipher *, void *, bool);
+extern bool cipher_set_key(struct cipher *, void *, bool);
+extern bool cipher_set_key_from_rsa(struct cipher *, void *, size_t, bool);
+extern bool cipher_regenerate_key(struct cipher *);
+extern bool cipher_encrypt(struct cipher *, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot);
+extern bool cipher_decrypt(struct cipher *, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot);
+extern int cipher_get_nid(const struct cipher *);
+extern bool cipher_active(const struct cipher *);
+
+#endif
--- /dev/null
+/*
+ crypto.c -- Cryptographic miscellaneous functions and initialisation
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <gcrypt.h>
+
+#include "crypto.h"
+
+void crypto_init() {
+}
+
+void crypto_exit() {
+}
+
+void randomize(void *out, size_t outlen) {
+ gcry_create_nonce(out, outlen);
+}
--- /dev/null
+/*
+ crypto.h -- header for crypto.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_CRYPTO_H__
+#define __TINC_CRYPTO_H__
+
+extern void crypto_init();
+extern void crypto_exit();
+extern void randomize(void *, size_t);
+
+#endif
--- /dev/null
+/*
+ digest.c -- Digest handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include "digest.h"
+#include "logger.h"
+
+static struct {
+ const char *name;
+ int algo;
+ int nid;
+} digesttable[] = {
+ {"none", GCRY_MD_NONE, 0},
+ {"sha1", GCRY_MD_SHA1, 64},
+ {"sha256", GCRY_MD_SHA256, 672},
+ {"sha384", GCRY_MD_SHA384, 673},
+ {"sha512", GCRY_MD_SHA512, 674},
+};
+
+static bool nametodigest(const char *name, int *algo) {
+ int i;
+
+ for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
+ if(digesttable[i].name && !strcasecmp(name, digesttable[i].name)) {
+ *algo = digesttable[i].algo;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool nidtodigest(int nid, int *algo) {
+ int i;
+
+ for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
+ if(nid == digesttable[i].nid) {
+ *algo = digesttable[i].algo;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool digesttonid(int algo, int *nid) {
+ int i;
+
+ for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
+ if(algo == digesttable[i].algo) {
+ *nid = digesttable[i].nid;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool digest_open(digest_t *digest, int algo) {
+ if(!digesttonid(algo, &digest->nid)) {
+ logger(LOG_DEBUG, _("Digest %d has no corresponding nid!"), algo);
+ return false;
+ }
+
+ digest->len = gcry_md_get_algo_dlen(algo);
+
+ return true;
+}
+
+bool digest_open_by_name(digest_t *digest, const char *name) {
+ int algo;
+
+ if(!nametodigest(name, &algo)) {
+ logger(LOG_DEBUG, _("Unknown digest name '%s'!"), name);
+ return false;
+ }
+
+ return digest_open(digest, algo);
+}
+
+bool digest_open_by_nid(digest_t *digest, int nid) {
+ int algo;
+
+ if(!nidtodigest(nid, &algo)) {
+ logger(LOG_DEBUG, _("Unknown digest ID %d!"), nid);
+ return false;
+ }
+
+ return digest_open(digest, algo);
+}
+
+bool digest_open_sha1(digest_t *digest) {
+ return digest_open(digest, GCRY_MD_SHA1);
+}
+
+void digest_close(digest_t *digest) {
+}
+
+bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) {
+ gcry_md_hash_buffer(digest->algo, outdata, indata, inlen);
+ return true;
+}
+
+bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const void *cmpdata) {
+ char outdata[digest->len];
+
+ gcry_md_hash_buffer(digest->algo, outdata, indata, inlen);
+ return !memcmp(cmpdata, outdata, digest->len);
+}
+
+int digest_get_nid(const digest_t *digest) {
+ return digest->nid;
+}
+
+size_t digest_length(const digest_t *digest) {
+ return digest->len;
+}
+
+bool digest_active(const digest_t *digest) {
+ return digest->algo != GCRY_MD_NONE;
+}
--- /dev/null
+/*
+ digest.h -- header file digest.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_DIGEST_H__
+#define __TINC_DIGEST_H__
+
+#include <gcrypt.h>
+
+typedef struct digest {
+ int algo;
+ int nid;
+ uint16_t len;
+} digest_t;
+
+static bool digest_open_by_name(struct digest *, const char *);
+static bool digest_open_by_nid(struct digest *, int);
+static bool digest_open_sha1(struct digest *);
+static void digest_close(struct digest *);
+static bool digest_create(struct digest *, const void *indata, size_t inlen, void *outdata);
+static bool digest_verify(struct digest *, const void *indata, size_t inlen, const void *digestdata);
+static int digest_get_nid(const struct digest *);
+static size_t digest_length(const struct digest *);
+static bool digest_active(const struct digest *);
+
+#endif
--- /dev/null
+/*
+ rsa.c -- RSA key handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <gcrypt.h>
+
+#include "logger.h"
+#include "rsa.h"
+
+// Base64 encoding/decoding tables
+
+static const uint8_t b64d[128] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
+ 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+ 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+ 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
+ 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
+ 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
+ 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
+ 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
+ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
+ 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+ 0x31, 0x32, 0x33, 0xff, 0xff, 0xff,
+ 0xff, 0xff
+};
+
+static const char b64e[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+// PEM encoding/decoding functions
+
+static bool pem_decode(FILE *fp, const char *header, uint8_t *buf, size_t size, size_t *outsize) {
+ bool decode = false;
+ char line[1024];
+ uint16_t word = 0;
+ int shift = 10;
+ size_t i, j = 0;
+
+ while(!feof(fp)) {
+ if(!fgets(line, sizeof line, fp))
+ return false;
+
+ if(!decode && !strncmp(line, "-----BEGIN ", 11)) {
+ if(!strncmp(line + 11, header, strlen(header)))
+ decode = true;
+ continue;
+ }
+
+ if(decode && !strncmp(line, "-----END", 8)) {
+ break;
+ }
+
+ if(!decode)
+ continue;
+
+ for(i = 0; line[i] >= ' '; i++) {
+ if(line[i] >= 128 || line[i] < 0 || b64d[(int)line[i]] == 0xff)
+ break;
+ word |= b64d[(int)line[i]] << shift;
+ shift -= 6;
+ if(shift <= 2) {
+ if(j > size) {
+ errno = ENOMEM;
+ return false;
+ }
+
+ buf[j++] = word >> 8;
+ word <<= 8;
+ shift += 8;
+ }
+ }
+ }
+
+ if(outsize)
+ *outsize = j;
+ return true;
+}
+
+
+// BER decoding functions
+
+static int ber_read_id(unsigned char **p, size_t *buflen) {
+ if(*buflen <= 0)
+ return -1;
+
+ if((**p & 0x1f) == 0x1f) {
+ int id = 0;
+ bool more;
+ while(*buflen > 0) {
+ id <<= 7;
+ id |= **p & 0x7f;
+ more = *(*p)++ & 0x80;
+ (*buflen)--;
+ if(!more)
+ break;
+ }
+ return id;
+ } else {
+ (*buflen)--;
+ return *(*p)++ & 0x1f;
+ }
+}
+
+static size_t ber_read_len(unsigned char **p, size_t *buflen) {
+ if(*buflen <= 0)
+ return -1;
+
+ if(**p & 0x80) {
+ size_t result = 0;
+ int len = *(*p)++ & 0x7f;
+ (*buflen)--;
+ if(len > *buflen)
+ return 0;
+
+ while(len--) {
+ result <<= 8;
+ result |= *(*p)++;
+ (*buflen)--;
+ }
+
+ return result;
+ } else {
+ (*buflen)--;
+ return *(*p)++;
+ }
+}
+
+
+static bool ber_read_sequence(unsigned char **p, size_t *buflen, size_t *result) {
+ int tag = ber_read_id(p, buflen);
+ size_t len = ber_read_len(p, buflen);
+
+ if(tag == 0x10) {
+ if(result)
+ *result = len;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static bool ber_read_mpi(unsigned char **p, size_t *buflen, gcry_mpi_t *mpi) {
+ int tag = ber_read_id(p, buflen);
+ size_t len = ber_read_len(p, buflen);
+ gcry_error_t err = 0;
+
+ if(tag != 0x02 || len > *buflen)
+ return false;
+
+ if(mpi)
+ err = gcry_mpi_scan(mpi, GCRYMPI_FMT_USG, *p, len, NULL);
+
+ *p += len;
+ *buflen -= len;
+
+ return mpi ? !err : true;
+}
+
+bool rsa_set_hex_public_key(rsa_t *rsa, char *n, char *e) {
+ gcry_error_t err = 0;
+
+ err = gcry_mpi_scan(&rsa->n, GCRY_FMT_HEX, n, 0, NULL)
+ ?: gcry_mpi_scan(&rsa->e, GCRY_FMT_HEX, n, 0, NULL);
+
+ if(err) {
+ logger(LOG_ERR, _("Error while reading RSA public key: %s"), gcry_strerror(errno));
+ return false;
+ }
+}
+
+bool rsa_set_hex_private_key(rsa_t *rsa, char *n, char *e, char *d) {
+ gcry_error_t err = 0;
+
+ err = gcry_mpi_scan(&rsa->n, GCRY_FMT_HEX, n, 0, NULL)
+ ?: gcry_mpi_scan(&rsa->e, GCRY_FMT_HEX, n, 0, NULL)
+ ?: gcry_mpi_scan(&rsa->d, GCRY_FMT_HEX, n, 0, NULL);
+
+ if(err) {
+ logger(LOG_ERR, _("Error while reading RSA public key: %s"), gcry_strerror(errno));
+ return false;
+ }
+}
+
+// Read PEM RSA keys
+
+bool read_pem_rsa_public_key(rsa_t *rsa, FILE *fp) {
+ uint8_t derbuf[8096], *derp = derbuf;
+ size_t derlen;
+
+ if(!pem_decode(fp, "RSA PUBLIC KEY", derbuf, sizeof derbuf, &derlen)) {
+ logger(LOG_ERR, _("Unable to read RSA public key: %s"), strerror(errno));
+ return NULL;
+ }
+
+ if(!ber_read_sequence(&derp, &derlen, NULL)
+ || !ber_read_mpi(&derp, &derlen, &rsa->n)
+ || !ber_read_mpi(&derp, &derlen, &rsa->e)
+ || derlen) {
+ logger(LOG_ERR, _("Error while decoding RSA public key"));
+ return NULL;
+ }
+
+ return true;
+}
+
+bool read_pem_rsa_private_key(rsa_t *rsa, FILE *fp) {
+ uint8_t derbuf[8096], *derp = derbuf;
+ size_t derlen;
+
+ if(!pem_decode(fp, "RSA PRIVATE KEY", derbuf, sizeof derbuf, &derlen)) {
+ logger(LOG_ERR, _("Unable to read RSA private key: %s"), strerror(errno));
+ return NULL;
+ }
+
+ if(!ber_read_sequence(&derp, &derlen, NULL)
+ || !ber_read_mpi(&derp, &derlen, NULL)
+ || !ber_read_mpi(&derp, &derlen, &rsa->n)
+ || !ber_read_mpi(&derp, &derlen, &rsa->e)
+ || !ber_read_mpi(&derp, &derlen, &rsa->d)
+ || !ber_read_mpi(&derp, &derlen, NULL) // p
+ || !ber_read_mpi(&derp, &derlen, NULL) // q
+ || !ber_read_mpi(&derp, &derlen, NULL)
+ || !ber_read_mpi(&derp, &derlen, NULL)
+ || !ber_read_mpi(&derp, &derlen, NULL) // u
+ || derlen) {
+ logger(LOG_ERR, _("Error while decoding RSA private key"));
+ return NULL;
+ }
+
+ return true;
+}
+
+size_t rsa_size(rsa_t *rsa) {
+ return (gcry_mpi_get_nbits(rsa->n) + 7) / 8;
+}
+
+/* Well, libgcrypt has functions to handle RSA keys, but they suck.
+ * So we just use libgcrypt's mpi functions, and do the math ourselves.
+ */
+
+// TODO: get rid of this macro, properly clean up gcry_ structures after use
+#define check(foo) { gcry_error_t err = (foo); if(err) {logger(LOG_ERR, "gcrypt error %s/%s at %s:%d\n", gcry_strsource(err), gcry_strerror(err), __FILE__, __LINE__); return false; }}
+
+bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out) {
+ gcry_mpi_t inmpi;
+ check(gcry_mpi_scan(&inmpi, GCRYMPI_FMT_USG, in, len, NULL));
+
+ gcry_mpi_t outmpi = gcry_mpi_new(len * 8);
+ gcry_mpi_powm(outmpi, inmpi, rsa->e, rsa->n);
+
+ check(gcry_mpi_print(GCRYMPI_FMT_USG, out,len, NULL, outmpi));
+
+ return true;
+}
+
+bool rsa_public_decrypt(rsa_t *rsa, void *in, size_t len, void *out) {
+ gcry_mpi_t inmpi;
+ check(gcry_mpi_scan(&inmpi, GCRYMPI_FMT_USG, in, len, NULL));
+
+ gcry_mpi_t outmpi = gcry_mpi_new(len * 8);
+ gcry_mpi_powm(outmpi, inmpi, rsa->d, rsa->n);
+
+ check(gcry_mpi_print(GCRYMPI_FMT_USG, out,len, NULL, outmpi));
+
+ return true;
+}
--- /dev/null
+/*
+ rsa.h -- RSA key handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_RSA_H__
+#define __TINC_RSA_H__
+
+#include <gcrypt.h>
+
+typedef struct rsa {
+ gcry_mpi_t n;
+ gcry_mpi_t e;
+ gcry_mpi_t d;
+} rsa_t;
+
+extern bool rsa_set_hex_public_key(rsa_t *rsa, char *n, char *e);
+extern bool rsa_set_hex_private_key(rsa_t *rsa, char *n, char *e, char *d);
+extern bool rsa_read_pem_public_key(rsa_t *rsa, FILE *fp);
+extern bool rsa_read_pem_private_key(rsa_t *rsa, FILE *fp);
+extern size_t rsa_size(rsa_t *rsa);
+extern bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out);
+extern bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out);
+
+#endif
#include "system.h"
-#include <openssl/err.h>
-#include <openssl/evp.h>
-
#include "splay_tree.h"
+#include "cipher.h"
#include "connection.h"
#include "logger.h"
#include "meta.h"
#include "xalloc.h"
bool send_meta(connection_t *c, const char *buffer, int length) {
- int outlen;
- int result;
cp();
- ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
- c->name, c->hostname);
+ ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length, c->name, c->hostname);
/* Add our data to buffer */
if(c->status.encryptout) {
char outbuf[length];
+ size_t outlen = length;
- result = EVP_EncryptUpdate(c->outctx, (unsigned char *)outbuf, &outlen, (unsigned char *)buffer, length);
- if(!result || outlen != length) {
- logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ if(!cipher_encrypt(&c->outcipher, buffer, length, outbuf, &outlen, false) || outlen != length) {
+ logger(LOG_ERR, _("Error while encrypting metadata to %s (%s)"), c->name, c->hostname);
return false;
}
- logger(LOG_DEBUG, _("Encrypted write %p %p %p %d"), c, c->buffer, outbuf, length);
bufferevent_write(c->buffer, (void *)outbuf, length);
- logger(LOG_DEBUG, _("Done."));
} else {
- logger(LOG_DEBUG, _("Unencrypted write %p %p %p %d"), c, c->buffer, buffer, length);
bufferevent_write(c->buffer, (void *)buffer, length);
- logger(LOG_DEBUG, _("Done."));
}
return true;
}
bool receive_meta(connection_t *c) {
- int result, inlen, outlen;
+ size_t inlen;
char inbuf[MAXBUFSIZE];
char *bufp = inbuf, *endp;
else
endp = bufp + inlen;
- logger(LOG_DEBUG, _("Received unencrypted %ld of %d bytes"), endp - bufp, inlen);
-
evbuffer_add(c->buffer->input, bufp, endp - bufp);
inlen -= endp - bufp;
bufp = endp;
} else {
- logger(LOG_DEBUG, _("Received encrypted %d bytes"), inlen);
+ size_t outlen = inlen;
evbuffer_expand(c->buffer->input, inlen);
- result = EVP_DecryptUpdate(c->inctx, (unsigned char *)c->buffer->input->buffer, &outlen, (unsigned char *)bufp, inlen);
- if(!result || outlen != inlen) {
- logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+
+ if(!cipher_decrypt(&c->incipher, bufp, inlen, c->buffer->input->buffer, &outlen, false) || inlen != outlen) {
+ logger(LOG_ERR, _("Error while decrypting metadata from %s (%s)"), c->name, c->hostname);
return false;
}
- c->buffer->input->off += inlen;
+ c->buffer->input->off += inlen;
inlen = 0;
}
char *request = evbuffer_readline(c->buffer->input);
if(request) {
- receive_request(c, request);
+ bool result = receive_request(c, request);
free(request);
+ if(!result)
+ return false;
continue;
} else {
break;
#include "system.h"
-#include <openssl/rand.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-#include <openssl/pem.h>
-#include <openssl/hmac.h>
-
#include <zlib.h>
#include LZO1X_H
#include "splay_tree.h"
+#include "cipher.h"
#include "conf.h"
#include "connection.h"
+#include "crypto.h"
+#include "digest.h"
#include "device.h"
#include "ethernet.h"
#include "graph.h"
#endif
int keylifetime = 0;
-EVP_CIPHER_CTX packet_ctx;
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
static void send_udppacket(node_t *, vpn_packet_t *);
len = 64;
memset(packet.data, 0, 14);
- RAND_pseudo_bytes(packet.data + 14, len - 14);
+ randomize(packet.data + 14, len - 14);
packet.len = len;
ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname);
vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
int nextpkt = 0;
vpn_packet_t *outpkt = pkt[0];
- int outlen, outpad;
- unsigned char hmac[EVP_MAX_MD_SIZE];
+ size_t outlen;
int i;
cp();
/* Check packet length */
- if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) {
+ if(inpkt->len < sizeof(inpkt->seqno) + digest_length(&myself->digest)) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
n->name, n->hostname);
return;
/* Check the message authentication code */
- if(myself->digest && myself->maclength) {
- inpkt->len -= myself->maclength;
- HMAC(myself->digest, myself->key, myself->keylength,
- (unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL);
-
- if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
- n->name, n->hostname);
- return;
- }
+ if(digest_active(&myself->digest) && !digest_verify(&myself->digest, &inpkt->seqno, inpkt->len, &inpkt->seqno + inpkt->len)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
+ return;
}
/* Decrypt the packet */
- if(myself->cipher) {
+ if(cipher_active(&myself->cipher)) {
outpkt = pkt[nextpkt++];
+ outlen = MAXSIZE;
- if(!EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL)
- || !EVP_DecryptUpdate(&packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
- (unsigned char *) &inpkt->seqno, inpkt->len)
- || !EVP_DecryptFinal_ex(&packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
- n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+ if(!cipher_decrypt(&myself->cipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s)"), n->name, n->hostname);
return;
}
- outpkt->len = outlen + outpad;
+ outpkt->len = outlen;
inpkt = outpkt;
}
int nextpkt = 0;
vpn_packet_t *outpkt;
int origlen;
- int outlen, outpad;
+ size_t outlen;
vpn_packet_t *copy;
static int priority = 0;
int origpriority;
/* Encrypt the packet */
- if(n->cipher) {
+ if(cipher_active(&n->cipher)) {
outpkt = pkt[nextpkt++];
+ outlen = MAXSIZE;
- if(!EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL)
- || !EVP_EncryptUpdate(&n->packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
- (unsigned char *) &inpkt->seqno, inpkt->len)
- || !EVP_EncryptFinal_ex(&n->packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
- ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
- n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+ if(!cipher_encrypt(&n->cipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
+ ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s)"), n->name, n->hostname);
goto end;
}
- outpkt->len = outlen + outpad;
+ outpkt->len = outlen;
inpkt = outpkt;
}
/* Add the message authentication code */
- if(n->digest && n->maclength) {
- HMAC(n->digest, n->key, n->keylength, (unsigned char *) &inpkt->seqno,
- inpkt->len, (unsigned char *) &inpkt->seqno + inpkt->len, NULL);
- inpkt->len += n->maclength;
+ if(digest_active(&n->digest)) {
+ digest_create(&n->digest, &inpkt->seqno, inpkt->len, &inpkt->seqno + inpkt->len);
+ inpkt->len += digest_length(&n->digest);
}
/* Determine which socket we have to use */
#include "system.h"
-#include <gcrypt.h>
-
-#include <openssl/pem.h>
-#include <openssl/rsa.h>
-#include <openssl/rand.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-
#include "splay_tree.h"
+#include "cipher.h"
#include "conf.h"
#include "connection.h"
#include "control.h"
#include "device.h"
+#include "digest.h"
#include "graph.h"
#include "logger.h"
#include "net.h"
bool read_rsa_public_key(connection_t *c) {
FILE *fp;
char *fname;
+ char *n;
bool result;
cp();
+ /* First, check for simple PublicKey statement */
+
+ if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
+ result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
+ free(n);
+ return result;
+ }
+
+ /* Else, check for PublicKeyFile statement and read it */
+
if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
asprintf(&fname, "%s/hosts/%s", confbase, c->name);
return false;
}
- result = read_pem_rsa_public_key(fp, &c->rsa_key);
+ result = rsa_read_pem_public_key(&c->rsa, fp);
fclose(fp);
if(!result)
bool read_rsa_private_key() {
FILE *fp;
char *fname;
+ char *n, *d;
bool result;
cp();
+ /* First, check for simple PrivateKey statement */
+
+ if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
+ if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &n)) {
+ logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
+ free(d);
+ return false;
+ }
+ result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
+ free(n);
+ free(d);
+ return true;
+ }
+
+ /* Else, check for PrivateKeyFile statement and read it */
+
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
asprintf(&fname, "%s/rsa_key.priv", confbase);
logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
#endif
- result = read_pem_rsa_private_key(fp, &myself->connection->rsa_key);
+ result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
fclose(fp);
if(!result)
}
void regenerate_key() {
- RAND_pseudo_bytes((unsigned char *)myself->key, myself->keylength);
+ ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
+
+ if(!cipher_regenerate_key(&myself->cipher, true)) {
+ logger(LOG_ERR, _("Error regenerating key!"));
+ abort();
+ }
if(timeout_initialized(&keyexpire_event)) {
- ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
event_del(&keyexpire_event);
send_key_changed(broadcast, myself);
} else {
}
event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
-
- if(myself->cipher) {
- EVP_CIPHER_CTX_init(&packet_ctx);
- if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, (unsigned char *)myself->key, (unsigned char *)myself->key + myself->cipher->key_len)) {
- logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
- myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
- abort();
- }
-
- }
}
/*
/* Generate packet encryption key */
- if(get_config_string
- (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
- if(!strcasecmp(cipher, "none")) {
- myself->cipher = NULL;
- } else {
- myself->cipher = EVP_get_cipherbyname(cipher);
-
- if(!myself->cipher) {
- logger(LOG_ERR, _("Unrecognized cipher type!"));
- return false;
- }
- }
- } else
- myself->cipher = EVP_bf_cbc();
-
- if(myself->cipher)
- myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
- else
- myself->keylength = 1;
-
- myself->connection->outcipher = EVP_bf_ofb();
+ if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
+ cipher = xstrdup("blowfish");
- myself->key = xmalloc(myself->keylength);
+ if(!cipher_open_by_name(&myself->cipher, cipher)) {
+ logger(LOG_ERR, _("Unrecognized cipher type!"));
+ return false;
+ }
if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
keylifetime = 3600;
regenerate_key();
+
/* Check if we want to use message authentication codes... */
- if(get_config_string
- (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
- if(!strcasecmp(digest, "none")) {
- myself->digest = NULL;
- } else {
- myself->digest = EVP_get_digestbyname(digest);
-
- if(!myself->digest) {
- logger(LOG_ERR, _("Unrecognized digest type!"));
- return false;
- }
- }
- } else
- myself->digest = EVP_sha1();
-
- myself->connection->outdigest = EVP_sha1();
-
- if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
- &myself->maclength)) {
- if(myself->digest) {
- if(myself->maclength > myself->digest->md_size) {
- logger(LOG_ERR, _("MAC length exceeds size of digest!"));
- return false;
- } else if(myself->maclength < 0) {
- logger(LOG_ERR, _("Bogus MAC length!"));
- return false;
- }
- }
- } else
- myself->maclength = 4;
+ if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
+ digest = xstrdup("sha1");
- myself->connection->outmaclength = 0;
+ if(!digest_open_by_name(&myself->digest, digest)) {
+ logger(LOG_ERR, _("Unrecognized digest type!"));
+ return false;
+ }
+
+ if(!get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
+
+ if(digest_active(&myself->digest)) {
+ if(myself->maclength > digest_length(&myself->digest)) {
+ logger(LOG_ERR, _("MAC length exceeds size of digest!"));
+ return false;
+ } else if(myself->maclength < 0) {
+ logger(LOG_ERR, _("Bogus MAC length!"));
+ return false;
+ }
+ }
/* Compression */
- if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
- &myself->compression)) {
+ if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->compression)) {
if(myself->compression < 0 || myself->compression > 11) {
logger(LOG_ERR, _("Bogus compression level!"));
return false;
if(!setup_device())
return false;
- event_set(&device_ev, device_fd, EV_READ|EV_PERSIST,
- handle_device_data, NULL);
+ event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
+
if (event_add(&device_ev, NULL) < 0) {
logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
close_device();
n->subnet_tree = new_subnet_tree();
n->edge_tree = new_edge_tree();
n->queue = list_alloc((list_action_t) free);
- EVP_CIPHER_CTX_init(&n->packet_ctx);
n->mtu = MTU;
n->maxmtu = MTU;
if(n->queue)
list_delete_list(n->queue);
- if(n->key)
- free(n->key);
-
if(n->subnet_tree)
free_subnet_tree(n->subnet_tree);
sockaddrfree(&n->address);
- EVP_CIPHER_CTX_cleanup(&n->packet_ctx);
+ cipher_close(&n->cipher);
+ digest_close(&n->digest);
event_del(&n->mtuevent);
for(node = node_tree->head; node; node = node->next) {
n = node->data;
logger(LOG_DEBUG, _(" %s at %s cipher %d digest %d maclength %d compression %d options %lx status %04x nexthop %s via %s pmtu %d (min %d max %d)"),
- n->name, n->hostname, n->cipher ? n->cipher->nid : 0,
- n->digest ? n->digest->type : 0, n->maclength, n->compression,
+ n->name, n->hostname, cipher_get_nid(&n->cipher),
+ digest_get_nid(&n->digest), n->maclength, n->compression,
n->options, *(uint32_t *)&n->status, n->nexthop ? n->nexthop->name : "-",
n->via ? n->via->name : "-", n->mtu, n->minmtu, n->maxmtu);
}
#define __TINC_NODE_H__
#include "splay_tree.h"
+#include "cipher.h"
#include "connection.h"
+#include "digest.h"
#include "list.h"
#include "subnet.h"
node_status_t status;
- const EVP_CIPHER *cipher; /* Cipher type for UDP packets */
- char *key; /* Cipher key and iv */
- int keylength; /* Cipher key and iv length */
- EVP_CIPHER_CTX packet_ctx; /* Cipher context */
-
- const EVP_MD *digest; /* Digest type for MAC */
- int maclength; /* Length of MAC */
+ cipher_t cipher; /* Cipher for UDP packets */
+ digest_t digest; /* Digest for UDP packets */
+ int maclength; /* Portion of digest to use */
int compression; /* Compressionlevel, 0 = no compression */
--- /dev/null
+/*
+ cipher.c -- Symmetric block cipher handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <openssl/rand.h>
+#include <openssl/err.h>
+
+#include "cipher.h"
+#include "logger.h"
+#include "xalloc.h"
+
+static bool cipher_open(cipher_t *cipher) {
+ cipher->keylen = cipher->cipher->key_len;
+ cipher->blklen = cipher->cipher->iv_len;
+
+ cipher->key = xmalloc(cipher->keylen + cipher->blklen);
+
+ EVP_CIPHER_CTX_init(&cipher->ctx);
+
+ return true;
+}
+
+bool cipher_open_by_name(cipher_t *cipher, const char *name) {
+ cipher->cipher = EVP_get_cipherbyname(name);
+
+ if(cipher->cipher)
+ return cipher_open(cipher);
+
+ logger(LOG_DEBUG, _("Unknown cipher name '%s'!"), name);
+ return false;
+}
+
+bool cipher_open_by_nid(cipher_t *cipher, int nid) {
+ cipher->cipher = EVP_get_cipherbynid(nid);
+
+ if(cipher->cipher)
+ return cipher_open(cipher);
+
+ logger(LOG_DEBUG, _("Unknown cipher nid %d!"), nid);
+ return false;
+}
+
+bool cipher_open_blowfish_ofb(cipher_t *cipher) {
+ cipher->cipher = EVP_bf_ofb();
+ return cipher_open(cipher);
+}
+
+void cipher_close(cipher_t *cipher) {
+ EVP_CIPHER_CTX_cleanup(&cipher->ctx);
+
+ if(cipher->key) {
+ free(cipher->key);
+ cipher->key = NULL;
+ }
+}
+
+size_t cipher_keylength(const cipher_t *cipher) {
+ return cipher->keylen + cipher->blklen;
+}
+
+void cipher_get_key(const cipher_t *cipher, void *key) {
+ memcpy(key, cipher->key, cipher->keylen + cipher->blklen);
+}
+
+bool cipher_set_key(cipher_t *cipher, void *key, bool encrypt) {
+ memcpy(cipher->key, key, cipher->keylen + cipher->blklen);
+ bool result;
+
+ if(encrypt)
+ result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+ else
+ result = EVP_DecryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+
+ if(result)
+ return true;
+
+ logger(LOG_ERR, _("Error while setting key: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool cipher_set_key_from_rsa(cipher_t *cipher, void *key, size_t len, bool encrypt) {
+ memcpy(cipher->key, key + len - (size_t)cipher->keylen, cipher->keylen);
+ memcpy(cipher->key + cipher->keylen, key + len - (size_t)cipher->keylen - (size_t)cipher->blklen, cipher->blklen);
+ bool result;
+
+ if(encrypt)
+ result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+ else
+ result = EVP_DecryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+
+ if(result)
+ return true;
+
+ logger(LOG_ERR, _("Error while setting key: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool cipher_regenerate_key(cipher_t *cipher, bool encrypt) {
+ bool result;
+
+ RAND_pseudo_bytes((unsigned char *)cipher->key, cipher->keylen + cipher->blklen);
+
+ if(encrypt)
+ result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+ else
+ result = EVP_DecryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)cipher->key, (unsigned char *)cipher->key + cipher->keylen);
+
+ if(result)
+ return true;
+
+ logger(LOG_ERR, _("Error while regenerating key: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool cipher_encrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) {
+ if(oneshot) {
+ int len = *outlen, pad;
+ if(EVP_EncryptInit_ex(&cipher->ctx, NULL, NULL, NULL, NULL)
+ &&EVP_EncryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)
+ && EVP_EncryptFinal(&cipher->ctx, outdata + len, &pad)) {
+ *outlen = len + pad;
+ return true;
+ }
+ } else {
+ int len = *outlen;
+ if(EVP_EncryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)) {
+ *outlen = len;
+ return true;
+ }
+ }
+
+ logger(LOG_ERR, _("Error while encrypting: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool cipher_decrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) {
+ if(oneshot) {
+ int len = *outlen, pad;
+ if(EVP_DecryptInit_ex(&cipher->ctx, NULL, NULL, NULL, NULL)
+ && EVP_DecryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)
+ && EVP_DecryptFinal(&cipher->ctx, outdata + len, &pad)) {
+ *outlen = len + pad;
+ return true;
+ }
+ } else {
+ int len = *outlen;
+ if(EVP_EncryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)) {
+ *outlen = len;
+ return true;
+ }
+ }
+
+ logger(LOG_ERR, _("Error while encrypting: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+int cipher_get_nid(const cipher_t *cipher) {
+ return cipher->cipher ? cipher->cipher->nid : 0;
+}
+
+bool cipher_active(const cipher_t *cipher) {
+ return cipher->cipher && cipher->cipher->nid != 0;
+}
--- /dev/null
+/*
+ cipher.h -- header file cipher.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_CIPHER_H__
+#define __TINC_CIPHER_H__
+
+#include <openssl/evp.h>
+
+typedef struct cipher {
+ EVP_CIPHER_CTX ctx;
+ const EVP_CIPHER *cipher;
+ char *key;
+ uint16_t keylen;
+ uint16_t blklen;
+} cipher_t;
+
+extern bool cipher_open_by_name(cipher_t *, const char *);
+extern bool cipher_open_by_nid(cipher_t *, int);
+extern bool cipher_open_blowfish_ofb(cipher_t *);
+extern void cipher_close(cipher_t *);
+extern size_t cipher_keylength(const cipher_t *);
+extern void cipher_get_key(const cipher_t *, void *);
+extern bool cipher_set_key(cipher_t *, void *, bool);
+extern bool cipher_set_key_from_rsa(cipher_t *, void *, size_t, bool);
+extern bool cipher_regenerate_key(cipher_t *, bool);
+extern bool cipher_encrypt(cipher_t *, void *indata, size_t inlen, void *outdata, size_t *outlen, bool);
+extern bool cipher_decrypt(cipher_t *, void *indata, size_t inlen, void *outdata, size_t *outlen, bool);
+extern int cipher_get_nid(const cipher_t *);
+extern bool cipher_active(const cipher_t *);
+
+#endif
--- /dev/null
+/*
+ crypto.c -- Cryptographic miscellaneous functions and initialisation
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <openssl/rand.h>
+#include <openssl/evp.h>
+#include <openssl/engine.h>
+
+#include "crypto.h"
+
+void crypto_init() {
+ RAND_load_file("/dev/urandom", 1024);
+
+ ENGINE_load_builtin_engines();
+ ENGINE_register_all_complete();
+
+ OpenSSL_add_all_algorithms();
+}
+
+void crypto_exit() {
+ EVP_cleanup();
+}
+
+void randomize(void *out, size_t outlen) {
+ RAND_pseudo_bytes(out, outlen);
+}
--- /dev/null
+/*
+ crypto.h -- header for crypto.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_CRYPTO_H__
+#define __TINC_CRYPTO_H__
+
+extern void crypto_init();
+extern void crypto_exit();
+extern void randomize(void *, size_t);
+
+#endif
--- /dev/null
+/*
+ digest.c -- Digest handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <openssl/err.h>
+
+#include "digest.h"
+#include "logger.h"
+
+bool digest_open_by_name(digest_t *digest, const char *name) {
+ digest->digest = EVP_get_digestbyname(name);
+ if(digest->digest)
+ return true;
+
+ logger(LOG_DEBUG, _("Unknown digest name '%s'!"), name);
+ return false;
+}
+
+bool digest_open_by_nid(digest_t *digest, int nid) {
+ digest->digest = EVP_get_digestbynid(nid);
+ if(digest->digest)
+ return true;
+
+ logger(LOG_DEBUG, _("Unknown digest nid %d!"), nid);
+ return false;
+}
+
+bool digest_open_sha1(digest_t *digest) {
+ digest->digest = EVP_sha1();
+ return true;
+}
+
+void digest_close(digest_t *digest) {
+}
+
+bool digest_create(digest_t *digest, void *indata, size_t inlen, void *outdata) {
+ EVP_MD_CTX ctx;
+
+ if(EVP_DigestInit(&ctx, digest->digest)
+ && EVP_DigestUpdate(&ctx, indata, inlen)
+ && EVP_DigestFinal(&ctx, outdata, NULL))
+ return true;
+
+ logger(LOG_DEBUG, _("Error creating digest: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool digest_verify(digest_t *digest, void *indata, size_t inlen, void *cmpdata) {
+ size_t len = EVP_MD_size(digest->digest);
+ char outdata[len];
+
+ return digest_create(digest, indata, inlen, outdata) && !memcmp(cmpdata, outdata, len);
+}
+
+int digest_get_nid(const digest_t *digest) {
+ return digest->digest ? digest->digest->type : 0;
+}
+
+size_t digest_length(const digest_t *digest) {
+ return EVP_MD_size(digest->digest);
+}
+
+bool digest_active(const digest_t *digest) {
+ return digest->digest && digest->digest->type != 0;
+}
--- /dev/null
+/*
+ digest.h -- header file digest.c
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_DIGEST_H__
+#define __TINC_DIGEST_H__
+
+#include <openssl/evp.h>
+
+typedef struct digest {
+ const EVP_MD *digest;
+} digest_t;
+
+extern bool digest_open_by_name(struct digest *, const char *);
+extern bool digest_open_by_nid(struct digest *, int);
+extern bool digest_open_sha1(struct digest *);
+extern void digest_close(struct digest *);
+extern bool digest_create(struct digest *, void *indata, size_t inlen, void *outdata);
+extern bool digest_verify(struct digest *, void *indata, size_t inlen, void *digestdata);
+extern int digest_get_nid(const struct digest *);
+extern size_t digest_length(const struct digest *);
+extern bool digest_active(const struct digest *);
+
+#endif
--- /dev/null
+/*
+ rsa.c -- RSA key handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#include "system.h"
+
+#include <openssl/pem.h>
+#include <openssl/err.h>
+
+#include "logger.h"
+#include "rsa.h"
+
+// Set RSA keys
+
+bool rsa_set_hex_public_key(rsa_t *rsa, char *n, char *e) {
+ *rsa = RSA_new();
+ BN_hex2bn(&(*rsa)->n, n);
+ BN_hex2bn(&(*rsa)->e, e);
+ return true;
+}
+
+bool rsa_set_hex_private_key(rsa_t *rsa, char *n, char *e, char *d) {
+ *rsa = RSA_new();
+ BN_hex2bn(&(*rsa)->n, n);
+ BN_hex2bn(&(*rsa)->e, e);
+ BN_hex2bn(&(*rsa)->d, d);
+ return true;
+}
+
+// Read PEM RSA keys
+
+bool rsa_read_pem_public_key(rsa_t *rsa, FILE *fp) {
+ *rsa = PEM_read_RSAPublicKey(fp, rsa, NULL, NULL);
+
+ if(*rsa)
+ return true;
+
+ *rsa = PEM_read_RSA_PUBKEY(fp, rsa, NULL, NULL);
+
+ if(*rsa)
+ return true;
+
+ logger(LOG_ERR, _("Unable to read RSA public key: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool rsa_read_pem_private_key(rsa_t *rsa, FILE *fp) {
+ *rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+
+ if(*rsa)
+ return true;
+
+ logger(LOG_ERR, _("Unable to read RSA private key: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+size_t rsa_size(rsa_t *rsa) {
+ return RSA_size(*rsa);
+}
+
+bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out) {
+ if(RSA_public_encrypt(len, in, out, *rsa, RSA_NO_PADDING) == len)
+ return true;
+
+ logger(LOG_ERR, _("Unable to perform RSA encryption: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
+
+bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out) {
+ if(RSA_private_decrypt(len, in, out, *rsa, RSA_NO_PADDING) == len)
+ return true;
+
+ logger(LOG_ERR, _("Unable to perform RSA decryption: %s"), ERR_error_string(ERR_get_error(), NULL));
+ return false;
+}
--- /dev/null
+/*
+ rsa.h -- RSA key handling
+ Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+*/
+
+#ifndef __TINC_RSA_H__
+#define __TINC_RSA_H__
+
+#include <openssl/rsa.h>
+
+typedef RSA *rsa_t;
+
+extern bool rsa_set_hex_public_key(rsa_t *rsa, char *n, char *e);
+extern bool rsa_set_hex_private_key(rsa_t *rsa, char *n, char *e, char *d);
+extern bool rsa_read_pem_public_key(rsa_t *rsa, FILE *fp);
+extern bool rsa_read_pem_private_key(rsa_t *rsa, FILE *fp);
+extern size_t rsa_size(rsa_t *rsa);
+extern bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t inlen, void *out);
+extern bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t inlen, void *out);
+
+#endif
#include "system.h"
-#include <openssl/sha.h>
-#include <openssl/rand.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-
#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
+#include "crypto.h"
#include "edge.h"
#include "graph.h"
#include "logger.h"
}
bool send_metakey(connection_t *c) {
- char *buffer;
- unsigned int len;
- bool x;
+ size_t len = rsa_size(&c->rsa);
+ char key[len];
+ char enckey[len];
+ char hexkey[2 * len + 1];
cp();
- len = get_rsa_size(&c->rsa_key);
-
- /* Allocate buffers for the meta key */
-
- buffer = alloca(2 * len + 1);
+ if(!cipher_open_blowfish_ofb(&c->outcipher))
+ return false;
- if(!c->outkey)
- c->outkey = xmalloc(len);
+ if(!digest_open_sha1(&c->outdigest))
+ return false;
- if(!c->outctx)
- c->outctx = xmalloc_and_zero(sizeof(*c->outctx));
- cp();
- /* Copy random data to the buffer */
+ /* Create a random key */
- RAND_pseudo_bytes((unsigned char *)c->outkey, len);
+ randomize(key, len);
/* The message we send must be smaller than the modulus of the RSA key.
By definition, for a key of k bits, the following formula holds:
This can be done by setting the most significant bit to zero.
*/
- c->outkey[0] &= 0x7F;
+ key[0] &= 0x7F;
+
+ cipher_set_key_from_rsa(&c->outcipher, key, len, true);
ifdebug(SCARY_THINGS) {
- bin2hex(c->outkey, buffer, len);
- buffer[len * 2] = '\0';
- logger(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"),
- buffer);
+ bin2hex(key, hexkey, len);
+ hexkey[len * 2] = '\0';
+ logger(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), hexkey);
}
/* Encrypt the random data
with a length equal to that of the modulus of the RSA key.
*/
- if(!rsa_public_encrypt(len, (unsigned char *)c->outkey, (unsigned char *)buffer, &c->rsa_key)) {
- logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
- c->name, c->hostname);
+ if(!rsa_public_encrypt(&c->rsa, key, len, enckey)) {
+ logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
return false;
}
/* Convert the encrypted random data to a hexadecimal formatted string */
- bin2hex(buffer, buffer, len);
- buffer[len * 2] = '\0';
+ bin2hex(enckey, hexkey, len);
+ hexkey[len * 2] = '\0';
/* Send the meta key */
- x = send_request(c, "%d %d %d %d %d %s", METAKEY,
- c->outcipher ? c->outcipher->nid : 0,
- c->outdigest ? c->outdigest->type : 0, c->outmaclength,
- c->outcompression, buffer);
-
- /* Further outgoing requests are encrypted with the key we just generated */
-
- if(c->outcipher) {
- if(!EVP_EncryptInit(c->outctx, c->outcipher,
- (unsigned char *)c->outkey + len - c->outcipher->key_len,
- (unsigned char *)c->outkey + len - c->outcipher->key_len -
- c->outcipher->iv_len)) {
- logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- c->status.encryptout = true;
- }
-
- return x;
+ bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
+ cipher_get_nid(&c->outcipher),
+ digest_get_nid(&c->outdigest), c->outmaclength,
+ c->outcompression, hexkey);
+
+ c->status.encryptout = true;
+ return result;
}
bool metakey_h(connection_t *c, char *request) {
- char buffer[MAX_STRING_SIZE];
+ char hexkey[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
- int len;
+ size_t len = rsa_size(&myself->connection->rsa);
+ char enckey[len];
+ char key[len];
cp();
- if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
- c->hostname);
+ if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
+ logger(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname);
return false;
}
- len = get_rsa_size(&myself->connection->rsa_key);
-
/* Check if the length of the meta key is all right */
- if(strlen(buffer) != len * 2) {
+ if(strlen(hexkey) != len * 2) {
logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
return false;
}
- /* Allocate buffers for the meta key */
-
- if(!c->inkey)
- c->inkey = xmalloc(len);
-
- if(!c->inctx)
- c->inctx = xmalloc_and_zero(sizeof(*c->inctx));
-
/* Convert the challenge from hexadecimal back to binary */
- hex2bin(buffer, buffer, len);
+ hex2bin(hexkey, enckey, len);
/* Decrypt the meta key */
- if(!rsa_private_decrypt(len, (unsigned char *)buffer, (unsigned char *)c->inkey, &myself->connection->rsa_key)) {
+ if(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
return false;
}
ifdebug(SCARY_THINGS) {
- bin2hex(c->inkey, buffer, len);
- buffer[len * 2] = '\0';
- logger(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
+ bin2hex(key, hexkey, len);
+ hexkey[len * 2] = '\0';
+ logger(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), hexkey);
}
- /* All incoming requests will now be encrypted. */
-
/* Check and lookup cipher and digest algorithms */
- if(cipher) {
- c->incipher = EVP_get_cipherbynid(cipher);
-
- if(!c->incipher) {
- logger(LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
- return false;
- }
-
- if(!EVP_DecryptInit(c->inctx, c->incipher,
- (unsigned char *)c->inkey + len - c->incipher->key_len,
- (unsigned char *)c->inkey + len - c->incipher->key_len -
- c->incipher->iv_len)) {
- logger(LOG_ERR, _("Error during initialisation of cipher from %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- c->status.decryptin = true;
- } else {
- c->incipher = NULL;
+ if(!cipher_open_by_nid(&c->incipher, cipher) || !cipher_set_key_from_rsa(&c->incipher, key, len, false)) {
+ logger(LOG_ERR, _("Error during initialisation of cipher from %s (%s)"), c->name, c->hostname);
+ return false;
}
- c->inmaclength = maclength;
-
- if(digest) {
- c->indigest = EVP_get_digestbynid(digest);
-
- if(!c->indigest) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
- return false;
- }
-
- if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
- logger(LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
- return false;
- }
- } else {
- c->indigest = NULL;
+ if(!digest_open_by_nid(&c->indigest, digest)) {
+ logger(LOG_ERR, _("Error during initialisation of digest from %s (%s)"), c->name, c->hostname);
+ return false;
}
- c->incompression = compression;
+ c->status.decryptin = true;
c->allow_request = CHALLENGE;
}
bool send_challenge(connection_t *c) {
- char *buffer;
- int len;
+ size_t len = rsa_size(&c->rsa);
+ char buffer[len * 2 + 1];
cp();
- /* CHECKME: what is most reasonable value for len? */
-
- len = get_rsa_size(&c->rsa_key);
-
- /* Allocate buffers for the challenge */
-
- buffer = alloca(2 * len + 1);
-
if(!c->hischallenge)
c->hischallenge = xmalloc(len);
/* Copy random data to the buffer */
- RAND_pseudo_bytes((unsigned char *)c->hischallenge, len);
+ randomize(c->hischallenge, len);
/* Convert to hex */
bool challenge_h(connection_t *c, char *request) {
char buffer[MAX_STRING_SIZE];
- int len;
+ size_t len = rsa_size(&myself->connection->rsa);
+ size_t digestlen = digest_length(&c->outdigest);
+ char digest[digestlen];
cp();
if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name,
- c->hostname);
+ logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname);
return false;
}
- len = get_rsa_size(&myself->connection->rsa_key);
-
/* Check if the length of the challenge is all right */
if(strlen(buffer) != len * 2) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, "wrong challenge length");
+ logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length");
return false;
}
- /* Allocate buffers for the challenge */
-
- if(!c->mychallenge)
- c->mychallenge = xmalloc(len);
-
/* Convert the challenge from hexadecimal back to binary */
- hex2bin(buffer, c->mychallenge, len);
+ hex2bin(buffer, buffer, len);
c->allow_request = CHAL_REPLY;
- /* Rest is done by send_chal_reply() */
-
- return send_chal_reply(c);
-}
-
-bool send_chal_reply(connection_t *c) {
- char hash[EVP_MAX_MD_SIZE * 2 + 1];
- EVP_MD_CTX ctx;
-
cp();
/* Calculate the hash from the challenge we received */
- if(!EVP_DigestInit(&ctx, c->indigest)
- || !EVP_DigestUpdate(&ctx, c->mychallenge, get_rsa_size(&myself->connection->rsa_key))
- || !EVP_DigestFinal(&ctx, (unsigned char *)hash, NULL)) {
- logger(LOG_ERR, _("Error during calculation of response for %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
+ digest_create(&c->indigest, buffer, len, digest);
/* Convert the hash to a hexadecimal formatted string */
- bin2hex(hash, hash, c->indigest->md_size);
- hash[c->indigest->md_size * 2] = '\0';
+ bin2hex(digest, buffer, digestlen);
+ buffer[digestlen * 2] = '\0';
/* Send the reply */
- return send_request(c, "%d %s", CHAL_REPLY, hash);
+ return send_request(c, "%d %s", CHAL_REPLY, buffer);
}
bool chal_reply_h(connection_t *c, char *request) {
char hishash[MAX_STRING_SIZE];
- char myhash[EVP_MAX_MD_SIZE];
- EVP_MD_CTX ctx;
cp();
/* Check if the length of the hash is all right */
- if(strlen(hishash) != c->outdigest->md_size * 2) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, _("wrong challenge reply length"));
+ if(strlen(hishash) != digest_length(&c->outdigest) * 2) {
+ logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length"));
return false;
}
/* Convert the hash to binary format */
- hex2bin(hishash, hishash, c->outdigest->md_size);
-
- /* Calculate the hash from the challenge we sent */
-
- if(!EVP_DigestInit(&ctx, c->outdigest)
- || !EVP_DigestUpdate(&ctx, c->hischallenge, get_rsa_size(&c->rsa_key))
- || !EVP_DigestFinal(&ctx, (unsigned char *)myhash, NULL)) {
- logger(LOG_ERR, _("Error during calculation of response from %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- /* Verify the incoming hash with the calculated hash */
+ hex2bin(hishash, hishash, digest_length(&c->outdigest));
- if(memcmp(hishash, myhash, c->outdigest->md_size)) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, _("wrong challenge reply"));
-
- ifdebug(SCARY_THINGS) {
- bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
- hishash[SHA_DIGEST_LENGTH * 2] = '\0';
- logger(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
- }
+ /* Verify the hash */
+ if(!digest_verify(&c->outdigest, c->hischallenge, rsa_size(&c->rsa), hishash)) {
+ logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply"));
return false;
}
Send an acknowledgement with the rest of the information needed.
*/
+ free(c->hischallenge);
c->allow_request = ACK;
return send_ack(c);
#include "system.h"
-#include <openssl/evp.h>
-#include <openssl/err.h>
-
#include "splay_tree.h"
+#include "cipher.h"
#include "connection.h"
#include "logger.h"
#include "net.h"
#include "utils.h"
#include "xalloc.h"
-bool mykeyused = false;
+static bool mykeyused = false;
bool send_key_changed(connection_t *c, const node_t *n) {
cp();
}
bool send_ans_key(connection_t *c, const node_t *from, const node_t *to) {
- char *key;
+ size_t keylen = cipher_keylength(&from->cipher);
+ char key[keylen];
cp();
- key = alloca(2 * from->keylength + 1);
- bin2hex(from->key, key, from->keylength);
- key[from->keylength * 2] = '\0';
+ cipher_get_key(&from->cipher, key);
+ bin2hex(key, key, keylen);
+ key[keylen * 2] = '\0';
return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
from->name, to->name, key,
- from->cipher ? from->cipher->nid : 0,
- from->digest ? from->digest->type : 0, from->maclength,
+ cipher_get_nid(&from->cipher),
+ digest_get_nid(&from->digest), from->maclength,
from->compression);
}
return send_request(to->nexthop->connection, "%s", request);
}
- /* Update our copy of the origin's packet key */
-
- if(from->key)
- free(from->key);
-
- from->key = xstrdup(key);
- from->keylength = strlen(key) / 2;
- hex2bin(from->key, from->key, from->keylength);
- from->key[from->keylength] = '\0';
-
- from->status.validkey = true;
- from->status.waitingforkey = false;
- from->sent_seqno = 0;
-
/* Check and lookup cipher and digest algorithms */
- if(cipher) {
- from->cipher = EVP_get_cipherbynid(cipher);
-
- if(!from->cipher) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name,
- from->hostname);
- return false;
- }
+ if(!cipher_open_by_nid(&from->cipher, cipher)) {
+ logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
+ return false;
+ }
- if(from->keylength != from->cipher->key_len + from->cipher->iv_len) {
- logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name,
- from->hostname);
- return false;
- }
- } else {
- from->cipher = NULL;
+ if(strlen(key) / 2 != cipher_keylength(&from->cipher)) {
+ logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
+ return false;
}
from->maclength = maclength;
- if(digest) {
- from->digest = EVP_get_digestbynid(digest);
-
- if(!from->digest) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name,
- from->hostname);
- return false;
- }
+ if(!digest_open_by_nid(&from->digest, digest)) {
+ logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
+ return false;
+ }
- if(from->maclength > from->digest->md_size || from->maclength < 0) {
- logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"),
- from->name, from->hostname);
- return false;
- }
- } else {
- from->digest = NULL;
+ if(from->maclength > digest_length(&from->digest) || from->maclength < 0) {
+ logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
+ return false;
}
if(compression < 0 || compression > 11) {
from->compression = compression;
- if(from->cipher)
- if(!EVP_EncryptInit_ex(&from->packet_ctx, from->cipher, NULL, (unsigned char *)from->key, (unsigned char *)from->key + from->cipher->key_len)) {
- logger(LOG_ERR, _("Error during initialisation of key from %s (%s): %s"),
- from->name, from->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
+ /* Update our copy of the origin's packet key */
+
+ hex2bin(key, key, cipher_keylength(&from->cipher));
+ cipher_set_key(&from->cipher, key, false);
+
+ from->status.validkey = true;
+ from->status.waitingforkey = false;
+ from->sent_seqno = 0;
if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
send_mtu_probe(from);
+++ /dev/null
-/*
- rsa.c -- RSA key handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#include "system.h"
-
-#include <gcrypt.h>
-
-#include "logger.h"
-#include "rsa.h"
-
-// Base64 encoding/decoding tables
-
-static const uint8_t b64d[128] = {
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
- 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
- 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
- 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
- 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
- 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
- 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
- 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
- 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
- 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
- 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
- 0x31, 0x32, 0x33, 0xff, 0xff, 0xff,
- 0xff, 0xff
-};
-
-static const char b64e[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-// PEM encoding/decoding functions
-
-static bool pem_decode(FILE *fp, const char *header, uint8_t *buf, size_t size, size_t *outsize) {
- bool decode = false;
- char line[1024];
- uint16_t word = 0;
- int shift = 10;
- size_t i, j = 0;
-
- while(!feof(fp)) {
- if(!fgets(line, sizeof line, fp))
- return false;
-
- if(!decode && !strncmp(line, "-----BEGIN ", 11)) {
- if(!strncmp(line + 11, header, strlen(header)))
- decode = true;
- continue;
- }
-
- if(decode && !strncmp(line, "-----END", 8)) {
- break;
- }
-
- if(!decode)
- continue;
-
- for(i = 0; line[i] >= ' '; i++) {
- if(line[i] >= 128 || line[i] < 0 || b64d[(int)line[i]] == 0xff)
- break;
- word |= b64d[(int)line[i]] << shift;
- shift -= 6;
- if(shift <= 2) {
- if(j > size) {
- errno = ENOMEM;
- return false;
- }
-
- buf[j++] = word >> 8;
- word <<= 8;
- shift += 8;
- }
- }
- }
-
- if(outsize)
- *outsize = j;
- return true;
-}
-
-
-// BER decoding functions
-
-static int ber_read_id(unsigned char **p, size_t *buflen) {
- if(*buflen <= 0)
- return -1;
-
- if((**p & 0x1f) == 0x1f) {
- int id = 0;
- bool more;
- while(*buflen > 0) {
- id <<= 7;
- id |= **p & 0x7f;
- more = *(*p)++ & 0x80;
- (*buflen)--;
- if(!more)
- break;
- }
- return id;
- } else {
- (*buflen)--;
- return *(*p)++ & 0x1f;
- }
-}
-
-static size_t ber_read_len(unsigned char **p, size_t *buflen) {
- if(*buflen <= 0)
- return -1;
-
- if(**p & 0x80) {
- size_t result = 0;
- int len = *(*p)++ & 0x7f;
- (*buflen)--;
- if(len > *buflen)
- return 0;
-
- while(len--) {
- result <<= 8;
- result |= *(*p)++;
- (*buflen)--;
- }
-
- return result;
- } else {
- (*buflen)--;
- return *(*p)++;
- }
-}
-
-
-static bool ber_read_sequence(unsigned char **p, size_t *buflen, size_t *result) {
- int tag = ber_read_id(p, buflen);
- size_t len = ber_read_len(p, buflen);
-
- if(tag == 0x10) {
- if(result)
- *result = len;
- return true;
- } else {
- return false;
- }
-}
-
-static bool ber_read_mpi(unsigned char **p, size_t *buflen, gcry_mpi_t *mpi) {
- int tag = ber_read_id(p, buflen);
- size_t len = ber_read_len(p, buflen);
- gcry_error_t err = 0;
-
- if(tag != 0x02 || len > *buflen)
- return false;
-
- if(mpi)
- err = gcry_mpi_scan(mpi, GCRYMPI_FMT_USG, *p, len, NULL);
-
- *p += len;
- *buflen -= len;
-
- return mpi ? !err : true;
-}
-
-// Read PEM RSA keys
-
-bool read_pem_rsa_public_key(FILE *fp, rsa_key_t *key) {
- uint8_t derbuf[8096], *derp = derbuf;
- size_t derlen;
-
- if(!pem_decode(fp, "RSA PUBLIC KEY", derbuf, sizeof derbuf, &derlen)) {
- logger(LOG_ERR, _("Unable to read RSA public key: %s"), strerror(errno));
- return NULL;
- }
-
- if(!ber_read_sequence(&derp, &derlen, NULL)
- || !ber_read_mpi(&derp, &derlen, &key->n)
- || !ber_read_mpi(&derp, &derlen, &key->e)
- || derlen) {
- logger(LOG_ERR, _("Error while decoding RSA public key"));
- return NULL;
- }
-
- return true;
-}
-
-bool read_pem_rsa_private_key(FILE *fp, rsa_key_t *key) {
- uint8_t derbuf[8096], *derp = derbuf;
- size_t derlen;
-
- if(!pem_decode(fp, "RSA PRIVATE KEY", derbuf, sizeof derbuf, &derlen)) {
- logger(LOG_ERR, _("Unable to read RSA private key: %s"), strerror(errno));
- return NULL;
- }
-
- if(!ber_read_sequence(&derp, &derlen, NULL)
- || !ber_read_mpi(&derp, &derlen, NULL)
- || !ber_read_mpi(&derp, &derlen, &key->n)
- || !ber_read_mpi(&derp, &derlen, &key->e)
- || !ber_read_mpi(&derp, &derlen, &key->d)
- || !ber_read_mpi(&derp, &derlen, NULL) // p
- || !ber_read_mpi(&derp, &derlen, NULL) // q
- || !ber_read_mpi(&derp, &derlen, NULL)
- || !ber_read_mpi(&derp, &derlen, NULL)
- || !ber_read_mpi(&derp, &derlen, NULL) // u
- || derlen) {
- logger(LOG_ERR, _("Error while decoding RSA private key"));
- return NULL;
- }
-
- return true;
-}
-
-unsigned int get_rsa_size(rsa_key_t *key) {
- return (gcry_mpi_get_nbits(key->n) + 7) / 8;
-}
-
-/* Well, libgcrypt has functions to handle RSA keys, but they suck.
- * So we just use libgcrypt's mpi functions, and do the math ourselves.
- */
-
-// TODO: get rid of this macro, properly clean up gcry_ structures after use
-#define check(foo) { gcry_error_t err = (foo); if(err) {logger(LOG_ERR, "gcrypt error %s/%s at %s:%d\n", gcry_strsource(err), gcry_strerror(err), __FILE__, __LINE__); return false; }}
-
-bool rsa_public_encrypt(size_t len, void *in, void *out, rsa_key_t *key) {
- gcry_mpi_t inmpi;
- check(gcry_mpi_scan(&inmpi, GCRYMPI_FMT_USG, in, len, NULL));
-
- gcry_mpi_t outmpi = gcry_mpi_new(len * 8);
- gcry_mpi_powm(outmpi, inmpi, key->e, key->n);
-
- check(gcry_mpi_print(GCRYMPI_FMT_USG, out,len, NULL, outmpi));
-
- return true;
-}
-
-bool rsa_private_decrypt(size_t len, void *in, void *out, rsa_key_t *key) {
- gcry_mpi_t inmpi;
- check(gcry_mpi_scan(&inmpi, GCRYMPI_FMT_USG, in, len, NULL));
-
- gcry_mpi_t outmpi = gcry_mpi_new(len * 8);
- gcry_mpi_powm(outmpi, inmpi, key->d, key->n);
-
- check(gcry_mpi_print(GCRYMPI_FMT_USG, out,len, NULL, outmpi));
-
- return true;
-}
+++ /dev/null
-/*
- rsa.h -- RSA key handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-*/
-
-#ifndef __TINC_RSA_H__
-#define __TINC_RSA_H__
-
-#include <gcrypt.h>
-
-typedef struct rsa_key_t {
- gcry_mpi_t n;
- gcry_mpi_t e;
- gcry_mpi_t d;
-} rsa_key_t;
-
-extern bool read_pem_rsa_public_key(FILE *fp, struct rsa_key_t *key);
-extern bool read_pem_rsa_private_key(FILE *fp, struct rsa_key_t *key);
-extern unsigned int get_rsa_size(struct rsa_key_t *key);
-extern bool rsa_public_encrypt(size_t len, void *in, void *out, struct rsa_key_t *key);
-extern bool rsa_private_decrypt(size_t len, void *in, void *out, struct rsa_key_t *key);
-
-
-#endif
#include <sys/mman.h>
#endif
-#include <openssl/rand.h>
-#include <openssl/rsa.h>
-#include <openssl/pem.h>
-#include <openssl/evp.h>
-#include <openssl/engine.h>
-
#include LZO1X_H
#include <getopt.h>
#include "conf.h"
#include "control.h"
+#include "crypto.h"
#include "device.h"
#include "logger.h"
#include "net.h"
/* Slllluuuuuuurrrrp! */
srand(time(NULL));
- RAND_load_file("/dev/urandom", 1024);
-
- ENGINE_load_builtin_engines();
- ENGINE_register_all_complete();
-
- OpenSSL_add_all_algorithms();
+ crypto_init();
if(!read_server_config())
return 1;
exit_control();
#endif
- EVP_cleanup();
-
+ crypto_exit();
+
return status;
}
projects / meshlink / commitdiff