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