version 3.0

ssh/ssh_protocol.cc

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2012-2013 Juli Mallett. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <openssl/bn.h>
+
+#include <common/buffer.h>
+#include <common/endian.h>
+
+#include <ssh/ssh_protocol.h>
+
+void
+SSH::String::encode(Buffer *out, const Buffer& in)
+{
+	SSH::UInt32::encode(out, in.length());
+	if (!in.empty())
+		out->append(in);
+}
+
+void
+SSH::String::encode(Buffer *out, Buffer *in)
+{
+	SSH::String::encode(out, *in);
+	if (!in->empty())
+		in->clear();
+}
+
+bool
+SSH::String::decode(Buffer *out, Buffer *in)
+{
+	uint32_t len;
+
+	if (in->length() < sizeof len)
+		return (false);
+	BigEndian::extract(&len, in);
+	if (len == 0) {
+		in->skip(sizeof len);
+		return (true);
+	}
+
+	if (in->length() < sizeof len + len)
+		return (false);
+
+	in->moveout(out, sizeof len, len);
+	return (true);
+}
+
+void
+SSH::UInt32::encode(Buffer *out, uint32_t in)
+{
+	BigEndian::append(out, in);
+}
+
+bool
+SSH::UInt32::decode(uint32_t *outp, Buffer *in)
+{
+	if (in->length() < sizeof *outp)
+		return (false);
+	BigEndian::extract(outp, in);
+	in->skip(sizeof *outp);
+	return (true);
+}
+
+void
+SSH::MPInt::encode(Buffer *out, const BIGNUM *in)
+{
+	if (BN_is_negative(in)) {
+		HALT("/ssh/mpint/encode") << "Negative numbers not yet implemented.";
+	}
+	uint8_t buf[BN_num_bytes(in)];
+	BN_bn2bin(in, buf);
+	if ((buf[0] & 0x80) == 0x80) {
+		SSH::UInt32::encode(out, sizeof buf + 1);
+		out->append((uint8_t)0x00);
+		out->append(buf, sizeof buf);
+	} else {
+		SSH::UInt32::encode(out, sizeof buf);
+		out->append(buf, sizeof buf);
+	}
+}
+
+bool
+SSH::MPInt::decode(BIGNUM **outp, Buffer *in)
+{
+	uint32_t len;
+	BIGNUM *out;
+
+	if (in->length() < sizeof len)
+		return (false);
+	BigEndian::extract(&len, in);
+	if (len == 0) {
+		out = BN_new();
+		if (out == NULL)
+			return (false);
+		in->skip(sizeof len);
+		BN_zero(out);
+		*outp = out;
+		return (true);
+	}
+
+	if (in->length() < sizeof len + len)
+		return (false);
+
+	uint8_t buf[len];
+	in->copyout(buf, sizeof len, len);
+	out = BN_bin2bn(buf, sizeof buf, NULL);
+	if (out == NULL)
+		return (false);
+	in->skip(sizeof len + len);
+	*outp = out;
+	return (true);
+}
+
+void
+SSH::NameList::encode(Buffer *out, const std::vector<Buffer>& in)
+{
+	Buffer merged;
+
+	merged = Buffer::join(in, ",");
+	SSH::String::encode(out, &merged);
+}
+
+bool
+SSH::NameList::decode(std::vector<Buffer>& out, Buffer *in)
+{
+	Buffer merged;
+
+	if (!SSH::String::decode(&merged, in))
+		return (false);
+
+	out = merged.split(',');
+	return (true);
+}