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Enforce Cid security rules for getting and adding blocks

Browse Source 
License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>
This commit is contained in:
Jakub Sztandera
2018-03-01 21:21:11 +01:00
parent 903ecd1a7b
commit c30422d790
5 changed files with 100 additions and 7 deletions
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33
blockservice/blockservice.go
View File

@ -10,6 +10,7 @@ import (
"io"
exchange "github.com/ipfs/go-ipfs/exchange"
"github.com/ipfs/go-ipfs/removeme/verifcid"
logging "gx/ipfs/QmRb5jh8z2E8hMGN2tkvs1yHynUanqnZ3UeKwgN1i9P1F8/go-log"
blockstore "gx/ipfs/QmTVDM4LCSUMFNQzbDLL9zQwp8usE6QHymFdh3h8vL9v6b/go-ipfs-blockstore"
@ -130,6 +131,11 @@ func NewSession(ctx context.Context, bs BlockService) *Session {
// TODO pass a context into this if the remote.HasBlock is going to remain here.
func (s *blockService) AddBlock(o blocks.Block) error {
c := o.Cid()
// hash security
err := verifcid.ValidateCid(c)
if err != nil {
return err
}
if s.checkFirst {
if has, err := s.blockstore.Has(c); has || err != nil {
return err
@ -149,6 +155,13 @@ func (s *blockService) AddBlock(o blocks.Block) error {
}
func (s *blockService) AddBlocks(bs []blocks.Block) error {
//hash security
for _, b := range bs {
err := verifcid.ValidateCid(b.Cid())
if err != nil {
return err
}
}
var toput []blocks.Block
if s.checkFirst {
toput = make([]blocks.Block, 0, len(bs))
@ -189,10 +202,15 @@ func (s *blockService) GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block,
f = s.exchange
}
return getBlock(ctx, c, s.blockstore, f)
return getBlock(ctx, c, s.blockstore, f) //hash security
}
func getBlock(ctx context.Context, c *cid.Cid, bs blockstore.Blockstore, f exchange.Fetcher) (blocks.Block, error) {
err := verifcid.ValidateCid(c)
if err != nil {
return nil, err
}
block, err := bs.Get(c)
if err == nil {
return block, nil
@ -224,11 +242,18 @@ func getBlock(ctx context.Context, c *cid.Cid, bs blockstore.Blockstore, f excha
// the returned channel.
// NB: No guarantees are made about order.
func (s *blockService) GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block {
return getBlocks(ctx, ks, s.blockstore, s.exchange)
return getBlocks(ctx, ks, s.blockstore, s.exchange) //hash security
}
func getBlocks(ctx context.Context, ks []*cid.Cid, bs blockstore.Blockstore, f exchange.Fetcher) <-chan blocks.Block {
out := make(chan blocks.Block)
for _, c := range ks {
// hash security
if err := verifcid.ValidateCid(c); err != nil {
log.Errorf("unsafe CID (%s) passed to blockService.GetBlocks: %s", c, err)
}
}
go func() {
defer close(out)
var misses []*cid.Cid
@ -285,12 +310,12 @@ type Session struct {
// GetBlock gets a block in the context of a request session
func (s *Session) GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block, error) {
return getBlock(ctx, c, s.bs, s.ses)
return getBlock(ctx, c, s.bs, s.ses) // hash security
}
// GetBlocks gets blocks in the context of a request session
func (s *Session) GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block {
return getBlocks(ctx, ks, s.bs, s.ses)
return getBlocks(ctx, ks, s.bs, s.ses) // hash security
}
var _ BlockGetter = (*Session)(nil)

5
core/builder.go
View File

@ -15,6 +15,7 @@ import (
dag "github.com/ipfs/go-ipfs/merkledag"
resolver "github.com/ipfs/go-ipfs/path/resolver"
pin "github.com/ipfs/go-ipfs/pin"
"github.com/ipfs/go-ipfs/removeme/verifbs"
repo "github.com/ipfs/go-ipfs/repo"
cfg "github.com/ipfs/go-ipfs/repo/config"
uio "github.com/ipfs/go-ipfs/unixfs/io"
@ -170,7 +171,9 @@ func setupNode(ctx context.Context, n *IpfsNode, cfg *BuildCfg) error {
TempErrFunc: isTooManyFDError,
}
//hash security
bs := bstore.NewBlockstore(rds)
bs = &verifbs.VerifBS{bs}
opts := bstore.DefaultCacheOpts()
conf, err := n.Repo.Config()
@ -196,8 +199,10 @@ func setupNode(ctx context.Context, n *IpfsNode, cfg *BuildCfg) error {
n.Blockstore = bstore.NewGCBlockstore(cbs, n.GCLocker)
if conf.Experimental.FilestoreEnabled {
// hash security
n.Filestore = filestore.NewFilestore(bs, n.Repo.FileManager())
n.Blockstore = bstore.NewGCBlockstore(n.Filestore, n.GCLocker)
n.Blockstore = &verifbs.VerifBSGC{n.Blockstore}
}
rcfg, err := n.Repo.Config()

2
core/commands/add.go
View File

@ -258,7 +258,7 @@ You can now check what blocks have been created by:
exch = offline.Exchange(addblockstore)
}
bserv := blockservice.New(addblockstore, exch)
bserv := blockservice.New(addblockstore, exch) //hash security 001
dserv := dag.NewDAGService(bserv)
outChan := make(chan interface{}, adderOutChanSize)

63
removeme/verifbs/verifbs.go Normal file
View File

@ -0,0 +1,63 @@
package verifbs
import (
"github.com/ipfs/go-ipfs/removeme/verifcid"
bstore "gx/ipfs/QmTVDM4LCSUMFNQzbDLL9zQwp8usE6QHymFdh3h8vL9v6b/go-ipfs-blockstore"
cid "gx/ipfs/QmcZfnkapfECQGcLZaf9B79NRg7cRa9EnZh4LSbkCzwNvY/go-cid"
blocks "gx/ipfs/Qmej7nf81hi2x2tvjRBF3mcp74sQyuDH4VMYDGd1YtXjb2/go-block-format"
)
type VerifBSGC struct {
bstore.GCBlockstore
}
func (bs *VerifBSGC) Put(b blocks.Block) error {
if err := verifcid.ValidateCid(b.Cid()); err != nil {
return err
}
return bs.GCBlockstore.Put(b)
}
func (bs *VerifBSGC) PutMany(blks []blocks.Block) error {
for _, b := range blks {
if err := verifcid.ValidateCid(b.Cid()); err != nil {
return err
}
}
return bs.GCBlockstore.PutMany(blks)
}
func (bs *VerifBSGC) Get(c *cid.Cid) (blocks.Block, error) {
if err := verifcid.ValidateCid(c); err != nil {
return nil, err
}
return bs.GCBlockstore.Get(c)
}
type VerifBS struct {
bstore.Blockstore
}
func (bs *VerifBS) Put(b blocks.Block) error {
if err := verifcid.ValidateCid(b.Cid()); err != nil {
return err
}
return bs.Blockstore.Put(b)
}
func (bs *VerifBS) PutMany(blks []blocks.Block) error {
for _, b := range blks {
if err := verifcid.ValidateCid(b.Cid()); err != nil {
return err
}
}
return bs.Blockstore.PutMany(blks)
}
func (bs *VerifBS) Get(c *cid.Cid) (blocks.Block, error) {
if err := verifcid.ValidateCid(c); err != nil {
return nil, err
}
return bs.Blockstore.Get(c)
}

4
test/sharness/t0050-block.sh
View File

@ -185,11 +185,11 @@ test_expect_success "block get output looks right" '
'
test_expect_success "can set multihash type and length on block put" '
HASH=$(echo "foooo" | ipfs block put --format=raw --mhtype=sha3 --mhlen=16)
HASH=$(echo "foooo" | ipfs block put --format=raw --mhtype=sha3 --mhlen=20)
'
test_expect_success "output looks good" '
test "z25ScPysKoxJBcPxczn9NvuHiZU5" = "$HASH"
test "z83bYcqyBkbx5fuNAcvbdv4pr5RYQiEpK" = "$HASH"
'
test_expect_success "can read block with different hash" '