/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2011 - 2013 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <limits.h>
#include <string.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>

#include "built_in.h"
#include "xmalloc.h"
#include "curve.h"
#include "ioops.h"
#include "rnd.h"
#include "die.h"
#include "str.h"
#include "curvetun.h"
#include "locking.h"
#include "crypto.h"
#include "config.h"

static void curve25519_init(struct curve25519_struct *curve)
{
	curve->enc_size = curve->dec_size = TUNBUFF_SIZ;

	curve->enc = xmalloc_aligned(curve->enc_size, 16);
	curve->dec = xmalloc_aligned(curve->dec_size, 16);

	spinlock_init(&curve->enc_lock);
	spinlock_init(&curve->dec_lock);
}

static void curve25519_destroy(struct curve25519_struct *curve)
{
        spinlock_destroy(&curve->enc_lock);
        spinlock_destroy(&curve->dec_lock);

	xzfree(curve->enc, curve->enc_size);
	xzfree(curve->dec, curve->dec_size);
}

struct curve25519_struct *curve25519_tfm_alloc(void)
{
	struct curve25519_struct *tfm;

	tfm = xzmalloc_aligned(sizeof(*tfm), 16);
	curve25519_init(tfm);

	return tfm;
}

void curve25519_tfm_free(struct curve25519_struct *tfm)
{
	curve25519_destroy(tfm);
	xzfree(tfm, sizeof(*tfm));
}

void curve25519_tfm_free_void(void *tfm)
{
	curve25519_tfm_free(tfm);
}

void curve25519_proto_init(struct curve25519_proto *proto,
			   unsigned char *pubkey_remote, size_t len)
{
	int result;
	char file[128];
	struct passwd *pw = getpwuid(getuid());
	unsigned char secretkey_own[crypto_box_sec_key_size];
	unsigned char publickey_own[crypto_box_pub_key_size];

	fmemset(secretkey_own, 0, sizeof(secretkey_own));
	fmemset(publickey_own, 0, sizeof(publickey_own));

	if (unlikely(!pubkey_remote || len != sizeof(publickey_own)))
		panic("Invalid argument on curve25519_proto_init!\n");

	slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
	read_blob_or_die(file, secretkey_own, sizeof(secretkey_own));

	crypto_scalarmult_curve25519_base(publickey_own, secretkey_own);
	result = crypto_verify_32(publickey_own, pubkey_remote);

	if (result == 0)
		panic("Remote end has same public key as you have!\n");

	crypto_box_beforenm(proto->key, pubkey_remote, secretkey_own);

	fmemset(proto->enonce, 0, sizeof(proto->enonce));
	fmemset(proto->dnonce, 0, sizeof(proto->dnonce));

	xmemset(secretkey_own, 0, sizeof(secretkey_own));
	xmemset(publickey_own, 0, sizeof(publickey_own));
}

ssize_t curve25519_encode(struct curve25519_struct *curve,
			  struct curve25519_proto *proto,
			  unsigned char *plaintext, size_t size,
			  unsigned char **ciphertext)
{
	int ret, i;
	ssize_t done = size;
	struct taia packet_taia;

	spinlock_lock(&curve->enc_lock);
	if (unlikely(size > curve->enc_size)) {
		done = -ENOMEM;
		goto out;
	}

	taia_now(&packet_taia);
	taia_pack(NONCE_EDN_OFFSET(proto->enonce), &packet_taia);

	fmemset(curve->enc, 0, curve->enc_size);
	ret = crypto_box_afternm(curve->enc, plaintext, size,
				 proto->enonce, proto->key);
	if (unlikely(ret)) {
		done = -EIO;
		goto out;
	}

	fmemcpy(NONCE_PKT_OFFSET(curve->enc),
		NONCE_EDN_OFFSET(proto->enonce), NONCE_LENGTH);
	for (i = 0; i < NONCE_RND_LENGTH; ++i)
		curve->enc[i] = (uint8_t) secrand();

	(*ciphertext) = curve->enc;
out:
	spinlock_unlock(&curve->enc_lock);
	return done;
}

ssize_t curve25519_decode(struct curve25519_struct *curve,
			  struct curve25519_proto *proto,
			  unsigned char *ciphertext, size_t size,
			  unsigned char **plaintext,
			  struct taia *arrival_taia)
{
	int ret;
	ssize_t done = size;
	struct taia packet_taia, tmp_taia;

	spinlock_lock(&curve->dec_lock);
	if (unlikely(size > curve->dec_size || size < NONCE_ALL_LENGTH)) {
		done = size < NONCE_ALL_LENGTH ? 0 : -ENOMEM;
		goto out;
	}

	if (arrival_taia == NULL) {
		taia_now(&tmp_taia);
		arrival_taia = &tmp_taia;
	}

	taia_unpack(NONCE_PKT_OFFSET(ciphertext), &packet_taia);
        if (taia_looks_good(arrival_taia, &packet_taia) == 0) {
		done = 0;
		goto out;
	}

	fmemcpy(NONCE_EDN_OFFSET(proto->dnonce),
		NONCE_PKT_OFFSET(ciphertext), NONCE_LENGTH);
	fmemset(curve->dec, 0, curve->dec_size);

	ret = crypto_box_open_afternm(curve->dec, ciphertext, size,
				      proto->dnonce, proto->key);
	if (unlikely(ret)) {
		done = -EIO;
		goto out;
	}

	(*plaintext) = curve->dec;
out:
	spinlock_unlock(&curve->dec_lock);
	return done;
}

int curve25519_pubkey_hexparse_32(unsigned char *bin, size_t blen,
				  const char *ascii, size_t alen)
{
	int ret = sscanf(ascii,
		     "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:"
		     "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:"
		     "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:"
		     "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx",
		      &bin[0],  &bin[1],  &bin[2],  &bin[3],  &bin[4],
		      &bin[5],  &bin[6],  &bin[7],  &bin[8],  &bin[9],
		     &bin[10], &bin[11], &bin[12], &bin[13], &bin[14],
		     &bin[15], &bin[16], &bin[17], &bin[18], &bin[19],
		     &bin[20], &bin[21], &bin[22], &bin[23], &bin[24],
		     &bin[25], &bin[26], &bin[27], &bin[28], &bin[29],
		     &bin[30], &bin[31]);
	return ret == 32;
}
ccount of that by merging extents,
it did not actually map large extents, but instead was doing a
block by block mapping. Since the journal was only being mapped
on mount, this was not normally noticeable.

With the updated code, it is now possible to use the same extent
mapping system during journal recovery (which will be added in a
later patch). This will allow checking of the integrity of the
journal before any reply of the journal content is attempted. For
this reason the code is moving to bmap.c, since it will be used
more widely in due course.

An exercise left for the reader is to compare the new function
gfs2_map_journal_extents() with gfs2_write_alloc_required()

Additionally, should there be a failure, the error reporting is
also updated to show more detail about what went wrong.

Signed-off-by: Steven Whitehouse &lt;swhiteho@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=b50f227bddf110ae4ea2df1ebdf7e282ad481803'>Diffstat</a></div><table summary='diffstat' class='diffstat'>