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/*
* Copyright (C) 2013 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "sshkey_builder.h"
#include <bio/bio_reader.h>
#include <utils/debug.h>
/**
* Load a generic public key from an SSH key blob
*/
static sshkey_public_key_t *parse_public_key(chunk_t blob)
{
bio_reader_t *reader;
chunk_t format;
reader = bio_reader_create(blob);
if (!reader->read_data32(reader, &format))
{
DBG1(DBG_LIB, "invalid key format in SSH key");
reader->destroy(reader);
return NULL;
}
if (chunk_equals(format, chunk_from_str("ssh-rsa")))
{
chunk_t n, e;
if (!reader->read_data32(reader, &e) ||
!reader->read_data32(reader, &n))
{
DBG1(DBG_LIB, "invalid RSA key in SSH key");
reader->destroy(reader);
return NULL;
}
reader->destroy(reader);
return lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
BUILD_RSA_MODULUS, n, BUILD_RSA_PUB_EXP, e, BUILD_END);
}
DBG1(DBG_LIB, "unsupported SSH key format %.*s", (int)format.len,
format.ptr);
reader->destroy(reader);
return NULL;
}
/**
* See header.
*/
sshkey_public_key_t *sshkey_public_key_load(key_type_t type, va_list args)
{
chunk_t blob = chunk_empty;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_SSHKEY:
blob = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
if (blob.ptr && type == KEY_ANY)
{
return parse_public_key(blob);
}
return NULL;
}
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