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authorDenys Vlasenko <vda.linux@googlemail.com>2014-02-23 22:31:13 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2014-02-23 22:31:13 (GMT)
commitd82046f59f8b3d338bcfe6aa3b786e13c5c54ee3 (patch)
treed5cc2c58ada8df263a83edfb1c39026498ade759
parent8b7e8ae2249ffd9aa2c67536554eb9f6b6636ba5 (diff)
downloadbusybox-d82046f59f8b3d338bcfe6aa3b786e13c5c54ee3.tar.gz
busybox-d82046f59f8b3d338bcfe6aa3b786e13c5c54ee3.tar.bz2
networking/ssl_helper: experimental matrixssl-based ssl helper
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/ssl_helper/README16
-rw-r--r--networking/ssl_helper/ssl_helper.c406
-rwxr-xr-xnetworking/ssl_helper/ssl_helper.sh11
3 files changed, 433 insertions, 0 deletions
diff --git a/networking/ssl_helper/README b/networking/ssl_helper/README
new file mode 100644
index 0000000..4d0508f
--- /dev/null
+++ b/networking/ssl_helper/README
@@ -0,0 +1,16 @@
+Build instructions:
+
+* Unpack matrixssl-3-4-2-open.tgz.
+* Build it: "make"
+* Drop this directory into matrixssl-3-4-2-open/ssl_helper
+* Run ssl_helper.sh to compile and link the helper
+
+Usage: "ssl_helper -d <FILE_DESCRIPTOR>" where FILE_DESCRIPTOR is open to the peer.
+
+In bash, you can do it this way:
+$ ssl_helper -d3 3<>/dev/tcp/HOST/PORT
+
+Stdin will be SSL-encrypted and sent to FILE_DESCRIPTOR.
+Data from FILE_DESCRIPTOR will be decrypted and sent to stdout.
+
+The plan is to adapt it for wget https helper, and for ssl support in nc.
diff --git a/networking/ssl_helper/ssl_helper.c b/networking/ssl_helper/ssl_helper.c
new file mode 100644
index 0000000..d840b1b
--- /dev/null
+++ b/networking/ssl_helper/ssl_helper.c
@@ -0,0 +1,406 @@
+/*
+ * Copyright (c) 2013 INSIDE Secure Corporation
+ * Copyright (c) PeerSec Networks, 2002-2011
+ * All Rights Reserved
+ *
+ * The latest version of this code is available at http://www.matrixssl.org
+ *
+ * This software is open source; 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <time.h>
+#include <poll.h>
+#include <sys/socket.h>
+
+#include "matrixssl/matrixsslApi.h"
+
+//#warning "DO NOT USE THESE DEFAULT KEYS IN PRODUCTION ENVIRONMENTS."
+
+/*
+ * If supporting client authentication, pick ONE identity to auto select a
+ * certificate and private key that support desired algorithms.
+ */
+#define ID_RSA /* RSA Certificate and Key */
+
+#define USE_HEADER_KEYS
+
+/* If the algorithm type is supported, load a CA for it */
+#ifdef USE_HEADER_KEYS
+/* CAs */
+# include "sampleCerts/RSA/ALL_RSA_CAS.h"
+/* Identity Certs and Keys for use with Client Authentication */
+# ifdef ID_RSA
+# define EXAMPLE_RSA_KEYS
+# include "sampleCerts/RSA/2048_RSA.h"
+# include "sampleCerts/RSA/2048_RSA_KEY.h"
+# endif
+#endif
+
+static ssize_t safe_write(int fd, const void *buf, size_t count)
+{
+ ssize_t n;
+
+ do {
+ n = write(fd, buf, count);
+ } while (n < 0 && errno == EINTR);
+
+ return n;
+}
+
+static ssize_t full_write(int fd, const void *buf, size_t len)
+{
+ ssize_t cc;
+ ssize_t total;
+
+ total = 0;
+
+ while (len) {
+ cc = safe_write(fd, buf, len);
+
+ if (cc < 0) {
+ if (total) {
+ /* we already wrote some! */
+ /* user can do another write to know the error code */
+ return total;
+ }
+ return cc; /* write() returns -1 on failure. */
+ }
+
+ total += cc;
+ buf = ((const char *)buf) + cc;
+ len -= cc;
+ }
+
+ return total;
+}
+
+static void say(const char *s, ...)
+{
+ char buf[256];
+ va_list p;
+ int sz;
+
+ va_start(p, s);
+ sz = vsnprintf(buf, sizeof(buf), s, p);
+ full_write(STDERR_FILENO, buf, sz >= 0 && sz < sizeof(buf) ? sz : strlen(buf));
+ va_end(p);
+}
+
+static void die(const char *s, ...)
+{
+ char buf[256];
+ va_list p;
+ int sz;
+
+ va_start(p, s);
+ sz = vsnprintf(buf, sizeof(buf), s, p);
+ full_write(STDERR_FILENO, buf, sz >= 0 && sz < sizeof(buf) ? sz : strlen(buf));
+ exit(1);
+ va_end(p);
+}
+
+#if 0
+# define dbg(...) say(__VA_ARGS__)
+#else
+# define dbg(...) ((void)0)
+#endif
+
+static struct pollfd pfd[2] = {
+ { -1, POLLIN|POLLERR|POLLHUP, 0 },
+ { -1, POLLIN|POLLERR|POLLHUP, 0 },
+};
+#define STDIN pfd[0]
+#define NETWORK pfd[1]
+#define STDIN_READY() (pfd[0].revents & (POLLIN|POLLERR|POLLHUP))
+#define NETWORK_READY() (pfd[1].revents & (POLLIN|POLLERR|POLLHUP))
+
+static int wait_for_input(void)
+{
+ if (STDIN.fd == NETWORK.fd) /* means both are -1 */
+ exit(0);
+ dbg("polling\n");
+ STDIN.revents = NETWORK.revents = 0;
+ return poll(pfd, 2, -1);
+}
+
+static int32 certCb(ssl_t *ssl, psX509Cert_t *cert, int32 alert)
+{
+ /* Example to allow anonymous connections based on a define */
+ if (alert > 0) {
+ return SSL_ALLOW_ANON_CONNECTION; // = 254
+ }
+#if 0
+ /* Validate the 'not before' and 'not after' dates, etc */
+ return PS_FAILURE; /* if we don't like this cert */
+#endif
+ return PS_SUCCESS;
+}
+
+static void close_conn_and_exit(ssl_t *ssl, int fd)
+{
+ unsigned char *buf;
+ int len;
+
+ fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
+ /* Quick attempt to send a closure alert, don't worry about failure */
+ if (matrixSslEncodeClosureAlert(ssl) >= 0) {
+ len = matrixSslGetOutdata(ssl, &buf);
+ if (len > 0) {
+ len = safe_write(fd, buf, len);
+ //if (len > 0) {
+ // matrixSslSentData(ssl, len);
+ //}
+ }
+ }
+ //matrixSslDeleteSession(ssl);
+ shutdown(fd, SHUT_WR);
+ exit(0);
+}
+
+static int encode_data(ssl_t *ssl, const void *data, int len)
+{
+ unsigned char *buf;
+ int available;
+
+ available = matrixSslGetWritebuf(ssl, &buf, len);
+ if (available < 0)
+ die("matrixSslGetWritebuf\n");
+ if (len > available)
+ die("len > available\n");
+ memcpy(buf, data, len);
+ if (matrixSslEncodeWritebuf(ssl, len) < 0)
+ die("matrixSslEncodeWritebuf\n");
+ return len;
+}
+
+static void flush_to_net(ssl_t *ssl, int fd)
+{
+ int rc;
+ int len;
+ unsigned char *buf;
+
+ while ((len = matrixSslGetOutdata(ssl, &buf)) > 0) {
+ dbg("writing net %d bytes\n", len);
+ if (full_write(fd, buf, len) != len)
+ die("write to network\n");
+ rc = matrixSslSentData(ssl, len);
+ if (rc < 0)
+ die("matrixSslSentData\n");
+ }
+}
+
+static void do_io_until_eof_and_exit(int fd, sslKeys_t *keys)
+{
+ int rc;
+ int len;
+ uint32_t len32u;
+ sslSessionId_t *sid;
+ ssl_t *ssl;
+ unsigned char *buf;
+
+ NETWORK.fd = fd;
+ /* Note! STDIN.fd is disabled (-1) until SSL handshake is over:
+ * we do not attempt to feed any user data to MatrixSSL
+ * before it is ready.
+ */
+
+ matrixSslNewSessionId(&sid);
+ rc = matrixSslNewClientSession(&ssl, keys, sid, 0, certCb, NULL, NULL, 0);
+dbg("matrixSslNewClientSession:rc=%d\n", rc);
+ if (rc != MATRIXSSL_REQUEST_SEND)
+ die("matrixSslNewClientSession\n");
+
+ len = 0; /* only to suppress compiler warning */
+ again:
+ switch (rc) {
+ case MATRIXSSL_REQUEST_SEND:
+ dbg("MATRIXSSL_REQUEST_SEND\n");
+ flush_to_net(ssl, fd);
+ goto poll_input;
+
+ case 0:
+ dbg("rc==0\n");
+ flush_to_net(ssl, fd);
+ goto poll_input;
+
+ case MATRIXSSL_REQUEST_CLOSE:
+ /* what does this mean if we are here? */
+ dbg("MATRIXSSL_REQUEST_CLOSE\n");
+ close_conn_and_exit(ssl, fd);
+
+ case MATRIXSSL_HANDSHAKE_COMPLETE:
+ dbg("MATRIXSSL_HANDSHAKE_COMPLETE\n");
+ /* Init complete, can start reading local user's data: */
+ STDIN.fd = STDIN_FILENO;
+ poll_input:
+ wait_for_input();
+ if (STDIN_READY()) {
+ char ibuf[4 * 1024];
+ dbg("reading stdin\n");
+ len = read(STDIN_FILENO, ibuf, sizeof(ibuf));
+ if (len < 0)
+ die("read error on stdin\n");
+ if (len == 0)
+ STDIN.fd = -1;
+ else {
+ len = encode_data(ssl, ibuf, len);
+ if (len) {
+ rc = MATRIXSSL_REQUEST_SEND;
+dbg("rc=%d\n", rc);
+ goto again;
+ }
+ }
+ }
+ read_network:
+ if (NETWORK_READY()) {
+ dbg("%s%s%s\n",
+ (pfd[1].revents & POLLIN) ? "POLLIN" : "",
+ (pfd[1].revents & POLLERR) ? "|POLLERR" : "",
+ (pfd[1].revents & POLLHUP) ? "|POLLHUP" : ""
+ );
+ len = matrixSslGetReadbuf(ssl, &buf);
+ if (len <= 0)
+ die("matrixSslGetReadbuf\n");
+ dbg("reading net up to %d\n", len);
+ len = read(fd, buf, len);
+ dbg("reading net:%d\n", len);
+ if (len < 0)
+ die("read error on network\n");
+ if (len == 0) /*eof*/
+ NETWORK.fd = -1;
+ len32u = len;
+ rc = matrixSslReceivedData(ssl, len, &buf, &len32u);
+dbg("matrixSslReceivedData:rc=%d\n", rc);
+ len = len32u;
+ if (rc < 0)
+ die("matrixSslReceivedData\n");
+ }
+ goto again;
+
+ case MATRIXSSL_APP_DATA:
+ dbg("MATRIXSSL_APP_DATA: writing stdout\n");
+ do {
+ if (full_write(STDOUT_FILENO, buf, len) != len)
+ die("write to stdout\n");
+ len32u = len;
+ rc = matrixSslProcessedData(ssl, &buf, &len32u);
+//this was seen returning rc=0:
+dbg("matrixSslProcessedData:rc=%d\n", rc);
+ len = len32u;
+ } while (rc == MATRIXSSL_APP_DATA);
+ if (pfd[1].fd == -1) {
+ /* Already saw EOF on network, and we processed
+ * and wrote out all ssl data. Signal it:
+ */
+ close(STDOUT_FILENO);
+ }
+ goto again;
+
+ case MATRIXSSL_REQUEST_RECV:
+ dbg("MATRIXSSL_REQUEST_RECV\n");
+ wait_for_input();
+ goto read_network;
+
+ case MATRIXSSL_RECEIVED_ALERT:
+ dbg("MATRIXSSL_RECEIVED_ALERT\n");
+ /* The first byte of the buffer is the level */
+ /* The second byte is the description */
+ if (buf[0] == SSL_ALERT_LEVEL_FATAL)
+ die("Fatal alert\n");
+ /* Closure alert is normal (and best) way to close */
+ if (buf[1] == SSL_ALERT_CLOSE_NOTIFY)
+ close_conn_and_exit(ssl, fd);
+ die("Warning alert\n");
+ len32u = len;
+ rc = matrixSslProcessedData(ssl, &buf, &len32u);
+dbg("matrixSslProcessedData:rc=%d\n", rc);
+ len = len32u;
+ goto again;
+
+ default:
+ /* If rc < 0 it is an error */
+ die("bad rc:%d\n", rc);
+ }
+}
+
+static sslKeys_t* make_keys(void)
+{
+ int rc, CAstreamLen;
+ char *CAstream;
+ sslKeys_t *keys;
+
+ if (matrixSslNewKeys(&keys) < 0)
+ die("matrixSslNewKeys\n");
+
+#ifdef USE_HEADER_KEYS
+ /*
+ * In-memory based keys
+ * Build the CA list first for potential client auth usage
+ */
+ CAstream = NULL;
+ CAstreamLen = sizeof(RSACAS);
+ if (CAstreamLen > 0) {
+ CAstream = psMalloc(NULL, CAstreamLen);
+ memcpy(CAstream, RSACAS, sizeof(RSACAS));
+ }
+
+ #ifdef ID_RSA
+ rc = matrixSslLoadRsaKeysMem(keys, RSA2048, sizeof(RSA2048),
+ RSA2048KEY, sizeof(RSA2048KEY), (unsigned char*)CAstream,
+ CAstreamLen);
+ if (rc < 0)
+ die("matrixSslLoadRsaKeysMem\n");
+ #endif
+
+ if (CAstream)
+ psFree(CAstream);
+#endif /* USE_HEADER_KEYS */
+ return keys;
+}
+
+int main(int argc, char **argv)
+{
+ int fd;
+ char *fd_str;
+
+ if (!argv[1])
+ die("Syntax error\n");
+ if (argv[1][0] != '-')
+ die("Syntax error\n");
+ if (argv[1][1] != 'd')
+ die("Syntax error\n");
+ fd_str = argv[1] + 2;
+ if (!fd_str[0])
+ fd_str = argv[2];
+ if (!fd_str || fd_str[0] < '0' || fd_str[0] > '9')
+ die("Syntax error\n");
+
+ fd = atoi(fd_str);
+ if (fd < 3)
+ die("Syntax error\n");
+
+ if (matrixSslOpen() < 0)
+ die("matrixSslOpen\n");
+
+ do_io_until_eof_and_exit(fd, make_keys());
+ /* does not return */
+
+ return 0;
+}
diff --git a/networking/ssl_helper/ssl_helper.sh b/networking/ssl_helper/ssl_helper.sh
new file mode 100755
index 0000000..dc52de7
--- /dev/null
+++ b/networking/ssl_helper/ssl_helper.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# I use this to build static uclibc based binary using Aboriginal Linux toolchain:
+PREFIX=x86_64-
+STATIC=-static
+# Standard build:
+PREFIX=""
+STATIC=""
+
+${PREFIX}gcc -Os -DPOSIX -I.. -I../sampleCerts -Wall -c ssl_helper.c -o ssl_helper.o
+${PREFIX}gcc $STATIC ssl_helper.o ../libmatrixssl.a -lc ../libmatrixssl.a -o ssl_helper