Commit Graph

42 Commits

Author SHA1 Message Date
Jakob Unterwurzacher
b96e3ee271 tlog: stop embedding log.Logger to prevent mistakes
A few places have called tlog.Warn.Print, which directly
calls into log.Logger due to embedding, losing all features
of tlog.

Stop embedding log.Logger to make sure the internal functions
cannot be called accidentially and fix (several!) instances
that did.
2018-02-28 09:02:18 +01:00
Jakob Unterwurzacher
5ad9bda206 cryptocore: make AEADTypeEnum values explicit
We now print the number in a debug message, so define
the numeric values explicitely instead of using iota.

This way you don't have to understand how iota works
to find out what the number means. Lack of understanding
of how iota works is also the reason why the numbers
start at 3 (to keep the current behavoir).
2018-02-18 16:20:38 +01:00
Jakob Unterwurzacher
6c6947126d cryptocore: zero derived keys
Zero the HKDF-derived keys when we don't need them
anymore, and let the variable run of of scope.

https://github.com/rfjakob/gocryptfs/issues/211
2018-02-18 16:07:09 +01:00
Jakob Unterwurzacher
bd78b44389 cryptocore, main: add two comments
While reading the code, I had to think about what it
does, so add a comment that explains it.
2018-02-18 12:41:11 +01:00
Jakob Unterwurzacher
72ddbae1e6 stupidgcm: create private copy of the key
Relieves the caller from worrying about whether they
can overwrite the key.
2018-02-18 12:35:51 +01:00
Jakob Unterwurzacher
18f6c6106c main: try to wipe cryptocore's secret keys on unmount
Raise the bar for recovering keys from memory.

https://github.com/rfjakob/gocryptfs/issues/211
2018-02-18 11:39:10 +01:00
Jakob Unterwurzacher
ed046aa359 Fix misspellings reported by goreportcard.com
https://goreportcard.com/report/github.com/rfjakob/gocryptfs#misspell
2017-08-21 21:06:05 +02:00
Jakob Unterwurzacher
312ea32bb7 cryptocore: add urandom + randprefetch benchmarks
The benchmark that supported the decision for 512-byte
prefetching previously lived outside the repo.

Let's add it where it belongs so it cannot get lost.
2017-08-16 18:33:00 +02:00
Jakob Unterwurzacher
0c520845f3 main: purge masterkey from memory as soon as possible
Remove the "Masterkey" field from fusefrontend.Args because it
should not be stored longer than neccessary. Instead pass the
masterkey as a separate argument to the filesystem initializers.

Then overwrite it with zeros immediately so we don't have
to wait for garbage collection.

Note that the crypto implementation still stores at least a
masterkey-derived value, so this change makes it harder, but not
impossible, to extract the encryption keys from memory.

Suggested at https://github.com/rfjakob/gocryptfs/issues/137
2017-08-11 19:02:26 +02:00
Jakob Unterwurzacher
ccf1a84e41 macos: make testing without openssl work properly
On MacOS, building and testing without openssl is much easier.
The tests should skip tests that fail because of missing openssl
instead of aborting.

Fixes https://github.com/rfjakob/gocryptfs/issues/123
2017-07-14 23:22:15 +02:00
Jakob Unterwurzacher
9837cb0ddc cryptocore: prefetch nonces in the background
Spawn a worker goroutine that reads the next 512-byte block
while the current one is being drained.

This should help reduce waiting times when /dev/urandom is very
slow (like on Linux 3.16 kernels).
2017-06-11 21:29:50 +02:00
Jakob Unterwurzacher
80516ed335 cryptocore: prefetch nonces in 512-byte blocks
On my machine, reading 512-byte blocks from /dev/urandom
(same via getentropy syscall) is a lot faster in terms of
throughput:

Blocksize    Throughput
 16          28.18 MB/s
512          83.75 MB/s

For a single-threaded streaming write, this drops the CPU usage of
nonceGenerator.Get to almost 1/3:

        flat  flat%   sum%        cum   cum%
Before     0     0% 95.08%      0.35s  2.92%  github.com/rfjakob/gocryptfs/internal/cryptocore.(*nonceGenerator).Get
After  0.01s 0.092% 92.34%      0.13s  1.20%  github.com/rfjakob/gocryptfs/internal/cryptocore.(*nonceGenerator).Get

This change makes the nonce reading single-threaded, which may
hurt massively-parallel writes.
2017-06-09 22:05:14 +02:00
Jakob Unterwurzacher
d2be22a07f cryptocore: remove lastNonce check
This check would need locking to be multithreading-safe.
But as it is in the fastpath, just remove it.
rand.Read() already guarantees that the value is random.
2017-06-07 23:08:43 +02:00
Jakob Unterwurzacher
d6ef283c3f cryptocore: improve comments and add tests for hkdfDerive
These should make it easier to re-implement the key derivation
that was enabled with the "HKDF" feature flag.
2017-05-27 14:41:20 +02:00
Jakob Unterwurzacher
edb3e19cb5 fix golint complaints 2017-04-29 14:50:58 +02:00
danim7
f1945c4daa Add -forcedecode
Force decode of encrypted files even if the integrity check fails, instead of
failing with an IO error. Warning messages are still printed to syslog if corrupted
files are encountered.
It can be useful to recover files from disks with bad sectors or other corrupted
media.

Closes https://github.com/rfjakob/gocryptfs/pull/102 .
2017-04-23 23:11:56 +02:00
Jakob Unterwurzacher
d0bc7970f7 full stack: implement HKDF support
...but keep it disabled by default for new filesystems.

We are still missing an example filesystem and CLI arguments
to explicitely enable and disable it.
2017-03-05 21:59:55 +01:00
Jakob Unterwurzacher
b732881518 configfile: switch to 128-bit IVs for master key encryption
There is no security reason for doing this, but it will allow
to consolidate the code once we drop compatibility with gocryptfs v1.2
(and earlier) filesystems.
2017-03-05 18:03:03 +01:00
Jakob Unterwurzacher
966308eeb7 Drop Go 1.4 compatability code everywhere
Yields a nice reduction in code size.
2017-03-05 17:44:14 +01:00
Jakob Unterwurzacher
874e4fb5e9 cryptocore: rename "BackendTypeEnum" -> "AEADTypeEnum"
There are two independent backends, one for name encryption,
the other one, AEAD, for file content.

"BackendTypeEnum" only applies to AEAD (file content), so make that
clear in the name.
2017-03-05 17:10:57 +01:00
Jakob Unterwurzacher
e032539e2c cryptocore: use eme v1.1 interface
Version 1.1 of the EME package (github.com/rfjakob/eme) added
a more convenient interface. Use it.

Note that you have to upgrade your EME package (go get -u)!
2017-03-05 13:58:24 +01:00
Jakob Unterwurzacher
c9f4400e6d Replace all calls to naked panic() with log.Panic()
We want all panics to show up in the syslog.
2016-12-10 11:54:36 +01:00
Jakob Unterwurzacher
aeda9721d0 Fix misspellings
Close https://github.com/rfjakob/gocryptfs/issues/54
2016-10-24 19:18:13 +02:00
Jakob Unterwurzacher
d3b78fea95 reverse: add panics against API abuse
These should help prevent later programming errors.
2016-10-09 17:05:12 +02:00
Jakob Unterwurzacher
a4956fa6bf A few more lint fixes 2016-10-04 23:30:05 +02:00
Valient Gough
b764917cd5 lint fixes 2016-10-04 23:18:33 +02:00
Jakob Unterwurzacher
db5782028a tests: skip tests with -openssl=false on Go 1.4 and lower
Go versions 1.4 and lower lack NewGCMWithNonceSize(), which causes
a panic in the test.
2016-10-04 22:34:12 +02:00
Jakob Unterwurzacher
a00402cc47 cryptocore: rename "gcm" variable to generic "aeadCipher"
As we now also support AES-SIV the old name is no longer
correct.
2016-10-04 00:17:09 +02:00
Jakob Unterwurzacher
bb52937834 cryptocore: derive 512-bit key for AES-SIV
AES-SIV uses 1/2 of the key for authentication, 1/2 for
encryption, so we need a 64-byte key for AES-256. Derive
it from the master key by hashing it with SHA-512.
2016-10-04 00:16:56 +02:00
Jakob Unterwurzacher
e9bb8b800c reverse: switch from GCM-SIV to AES-SIV
GCM-SIV is not yet finalized, and the reference implemenation is
painfully slow at about 2 MB/s. Switch to AES-SIV.
2016-09-26 23:25:13 +02:00
Jakob Unterwurzacher
5f726aaa9d contentenc: add GCM-SIV support
Also add ReverseDummyNonce nonce generation.
2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
7f87ed78f2 cryptocore: add support for GCM-SIV 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
7395b8e990 cryptocore: comment why 96-bit IVs are still supported 2016-07-31 13:36:38 +02:00
Jakob Unterwurzacher
e8a234f658 Add godoc comments to all internal packages 2016-07-06 21:51:25 +02:00
Jakob Unterwurzacher
6c3f97399a Rename internal "toggledlog" package to "tlog"
tlog is used heavily everywhere and deserves a shorter name.

Renamed using sed magic, without any manual rework:

   find * -type f -exec sed -i 's/toggledlog/tlog/g' {} +
2016-06-15 23:30:44 +02:00
Jakob Unterwurzacher
906172938a stupidgcm: skip tests on Go 1.4 and older
Quoting from the patch:

	We compare against Go's built-in GCM implementation. Since stupidgcm only
	supports 128-bit IVs and Go only supports that from 1.5 onward, we cannot
	run these tests on older Go versions.
2016-05-05 00:09:08 +02:00
Jakob Unterwurzacher
66156181ee cryptocore: support Go 1.4 in tests 2016-05-05 00:09:08 +02:00
Jakob Unterwurzacher
39f3a24484 stupidgcm: completely replace spacemonkeygo/openssl 2016-05-04 19:56:07 +02:00
Jakob Unterwurzacher
1bb907b38e cryptocore: add API tests 2016-05-04 19:56:07 +02:00
Jakob Unterwurzacher
b5221c9651 Fix Go 1.4 build failure caused by a refactoring oversight 2016-03-03 00:48:32 +01:00
Jakob Unterwurzacher
c74772bc8d Run go fmt 2016-02-06 20:23:36 +01:00
Jakob Unterwurzacher
2b8cbd9441 Major refactoring: Split up "cryptfs" into several internal packages
"git status" for reference:

deleted:    cryptfs/cryptfs.go
deleted:    cryptfs/names_core.go
modified:   integration_tests/cli_test.go
modified:   integration_tests/helpers.go
renamed:    cryptfs/config_file.go -> internal/configfile/config_file.go
renamed:    cryptfs/config_test.go -> internal/configfile/config_test.go
renamed:    cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore
renamed:    cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf
renamed:    cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf
renamed:    cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf
renamed:    cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf
renamed:    cryptfs/kdf.go -> internal/configfile/kdf.go
renamed:    cryptfs/kdf_test.go -> internal/configfile/kdf_test.go
renamed:    cryptfs/cryptfs_content.go -> internal/contentenc/content.go
new file:   internal/contentenc/content_api.go
renamed:    cryptfs/content_test.go -> internal/contentenc/content_test.go
renamed:    cryptfs/file_header.go -> internal/contentenc/file_header.go
renamed:    cryptfs/intrablock.go -> internal/contentenc/intrablock.go
renamed:    cryptfs/address_translation.go -> internal/contentenc/offsets.go
new file:   internal/cryptocore/crypto_api.go
renamed:    cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go
renamed:    cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go
renamed:    cryptfs/nonce.go -> internal/cryptocore/nonce.go
renamed:    cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go
renamed:    cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash
renamed:    cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go
new file:   internal/nametransform/name_api.go
new file:   internal/nametransform/names_core.go
renamed:    cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go
renamed:    cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go
renamed:    cryptfs/names_test.go -> internal/nametransform/names_test.go
new file:   internal/nametransform/pad16.go
renamed:    cryptfs/log.go -> internal/toggledlog/log.go
renamed:    cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go
renamed:    cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go
modified:   main.go
modified:   masterkey.go
modified:   pathfs_frontend/file.go
modified:   pathfs_frontend/file_holes.go
modified:   pathfs_frontend/fs.go
modified:   pathfs_frontend/fs_dir.go
modified:   pathfs_frontend/names.go
modified:   test.bash
2016-02-06 19:22:35 +01:00