hardcoresushi/libgocryptfs
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Author SHA1 Message Date
Sebastian Lackner
7e05e809b7 main: Run 'ensure fds' code early during the program startup. 
The files are apparently processed in alphabetic order, so cli_args.go is
processed before main.go. In order to run before the go-fuse imports, put
the 'ensure fds' code in a separate package. Debug messages are omitted
to avoid additional imports (that might contain other code messing up our
file descriptors).
 2019-01-05 16:12:16 +01:00
Jakob Unterwurzacher
ad15ad9985 main: ensure fds 0,1,2 are always open 
The Go stdlib, as well as the gocryptfs code, relies on the fact
that fds 0,1,2 are always open.

See https://github.com/rfjakob/gocryptfs/issues/320 for details.
 2019-01-05 14:17:51 +01:00
Sebastian Lackner
5055f39bd5 fusefrontend: Allow to set/remove xattr on directory without read permission. 
Setting/removing extended attributes on directories was partially fixed with
commit eff35e60b6. However, on most file systems
it is also possible to do these operations without read access (see tests).

Since we cannot open a write-access fd to a directory, we have to use the
/proc/self/fd trick (already used for ListXAttr) for the other operations aswell.
For simplicity, let's separate the Linux and Darwin code again (basically revert
commit f320b76fd1), and always use the
/proc/self/fd trick on Linux. On Darwin we use the best-effort approach with
openBackingFile() as a fallback.

More discussion about the available options is available in
https://github.com/rfjakob/gocryptfs/issues/308.
 2019-01-05 12:34:40 +01:00
Sebastian Lackner
f17721c364 A few more spelling fixes. 2019-01-05 12:27:55 +01:00
Jakob Unterwurzacher
8c35235c34 Add Makefile 
We are going to use the Makefile to save useful commands
without creating too many shell scripts in the top dir.
 2019-01-05 12:25:38 +01:00
Jakob Unterwurzacher
61a6b24d4e doc: update extractloop results 
Update output and add a nice plot.
 2019-01-05 12:17:17 +01:00
Jakob Unterwurzacher
28139ca91d doc: update XFSTESTS results 2019-01-05 12:06:00 +01:00
Jakob Unterwurzacher
65eded4a22 tests: bump maxCacheFds to 3 
As the dirCache now has 3 entries, the tests should accept
up to 3 extra fds without declaring an fd leak.
 2019-01-04 23:50:01 +01:00
Jakob Unterwurzacher
c32066c5b0 fusefrontend: fix fd leak in dirCache 
The missing break meant that we may find a second
hit in the cache, Dup() a second fd, and leak the first
one.

Thanks @slackner for finding this.
 2019-01-04 23:35:48 +01:00
Jakob Unterwurzacher
8074f12beb nametransform: ReadDirIVAt: return raw syscall error 
Otherwise this can happen, as triggered by xfstests generic/011:

  go-fuse: can't convert error type: openat failed: too many open files

The app then gets a misleading "Function not implemented" error.
 2019-01-04 23:21:27 +01:00
Jakob Unterwurzacher
3473a84963 fusefrontend: print warning when Create() runs out of file descriptors 
We alread have this warning in Open(), but xfstests generic/488
causes "too many open files" via Create. Add the same message so
the user sees what is going on.
 2019-01-04 23:15:04 +01:00
Jakob Unterwurzacher
eff35e60b6 fusefrontend: fix setting xattrs on directories 
Directories cannot be opened read-write. Retry with RDONLY.
 2019-01-04 22:22:24 +01:00
Jakob Unterwurzacher
3365cfc02b fusefrontend: disable dirCache stats printing 
This was inadvertedly kept enabled after benchmarking.
 2019-01-04 22:07:02 +01:00
Sebastian Lackner
fab695fa60 Documentation: Fix MANPAGE-render.bash script. 2019-01-04 22:04:44 +01:00
Jakob Unterwurzacher
23b5c80a04 Update performance.txt 2019-01-04 22:04:14 +01:00
Jakob Unterwurzacher
c0a7a14cde fusefrontend: upgrade to three-entry dirCache 
3 entries should work well for up to three parallel users.
It works well for extractloop.bash (two parallel tar extracts).
 2019-01-04 21:45:03 +01:00
Jakob Unterwurzacher
c1a2a36a79 fsck: don't misdetect a file hole at EOF 
https://github.com/rfjakob/gocryptfs/issues/304 :

A second minor issue is that `if bytes.Equal(buf, allZero) {` compares the whole
buffer, although the last read could have been shorter. This could trigger the
"skip file hole" code at the end of a file although there isn't any hole to
skip.
 2019-01-04 20:26:16 +01:00
Jakob Unterwurzacher
4b1d080673 Update gocryptfs-xray manpage, have MANPAGE-render.bash generate both 
have MANPAGE-render.bash generate both gocryptfs.1 and gocryptfs-xray.1
 2019-01-04 20:12:07 +01:00
Jakob Unterwurzacher
7f0de69fe2 Update changelog and gocryptfs-xray manpage 2019-01-04 20:12:07 +01:00
Sebastian Lackner
117dc3f2cc fusefrontend_reverse: Fix redeclaration of 'entries' variable. 
Go version go1.10.7 linux/amd64 complains with:

 internal/fusefrontend_reverse/rfs.go:333: declaration of "entries" shadows
 declaration at internal/fusefrontend_reverse/rfs.go:327
 2019-01-04 20:11:45 +01:00
Jakob Unterwurzacher
2024616722 xray: print "assuming AES-GCM mode" unless -aessiv is passed 
To alert the user that they can and should choose the
right mode.
 2019-01-04 19:34:15 +01:00
Jakob Unterwurzacher
8c18fb5db9 file-format.md: document AES-SIV block layout 
Fixes https://github.com/rfjakob/gocryptfs/issues/299
 2019-01-04 19:31:41 +01:00
Jakob Unterwurzacher
28584d0d2c xray: recreate test filesytems with -scrypt 10 
Speeds up the dumpmasterkey test *a lot*:

Before:
  ok  	github.com/rfjakob/gocryptfs/gocryptfs-xray/xray_tests	0.398s

After:
  ok  	github.com/rfjakob/gocryptfs/gocryptfs-xray/xray_tests	0.023s
 2019-01-04 19:31:08 +01:00
Jakob Unterwurzacher
8d71f8fe52 xray: add dumpmasterkey test 2019-01-04 19:21:09 +01:00
Jakob Unterwurzacher
44e860d105 xray: add support for inspecting AES-SIV files (-aessiv flag) 
https://github.com/rfjakob/gocryptfs/issues/299 :

In GCM mode the auth tags are at the end of each block, but in
SIV mode the auth tags follow immediately after the nonce. As a
result, in AES-SIV mode the output of gocryptfs-xray is misleading
and does not actually print the auth tag, but just the last
16-byte of the ciphertext.

diff --git a/gocryptfs-xray/xray_main.go b/gocryptfs-xray/xray_main.go index 74c9fb3..5a81caf 100644 ---
a/gocryptfs-xray/xray_main.go +++ b/gocryptfs-xray/xray_main.go @@ -16,9 +16,10 @@ import (
 )

 const ( - ivLen = contentenc.DefaultIVBits / 8 - blockSize = contentenc.DefaultBS + ivLen + cryptocore.AuthTagLen - myName =
"gocryptfs-xray" + ivLen = contentenc.DefaultIVBits / 8 + authTagLen = cryptocore.AuthTagLen + blockSize = contentenc.DefaultBS +
ivLen + cryptocore.AuthTagLen + myName = "gocryptfs-xray"
 )

 func errExit(err error) { @@ -26,13 +27,18 @@ func errExit(err error) { os.Exit(1)
 }

-func prettyPrintHeader(h *contentenc.FileHeader) { +func prettyPrintHeader(h *contentenc.FileHeader, aessiv bool) { id :=
 	hex.EncodeToString(h.ID)
- fmt.Printf("Header: Version: %d, Id: %s\n", h.Version, id) + msg := "Header: Version: %d, Id: %s" + if aessiv { + msg += ",
assuming AES-SIV mode" + } + fmt.Printf(msg+"\n", h.Version, id)
 }

 func main() { dumpmasterkey := flag.Bool("dumpmasterkey", false, "Decrypt and dump the master key") +	aessiv :=
flag.Bool("aessiv", false, "Assume AES-SIV mode instead of AES-GCM")
 	flag.Parse() if flag.NArg() != 1 { fmt.Fprintf(os.Stderr, "Usage: %s [OPTIONS] FILE\n"+ @@ -54,7 +60,7 @@ func main() { if
 	*dumpmasterkey {
 		dumpMasterKey(fn)
 	} else {
- inspectCiphertext(fd) + inspectCiphertext(fd, *aessiv)
 	}
 }

@@ -72,7 +78,7 @@ func dumpMasterKey(fn string) {
 	}
 }

-func inspectCiphertext(fd *os.File) { +func inspectCiphertext(fd *os.File, aessiv bool) { headerBytes := make([]byte,
 	contentenc.HeaderLen) n, err := fd.ReadAt(headerBytes, 0) if err == io.EOF && n == 0 {
@@ -88,34 +94,30 @@ func inspectCiphertext(fd *os.File) { if err != nil { errExit(err)
 	}
-	prettyPrintHeader(header) +	prettyPrintHeader(header, aessiv) var i int64 +	buf := make([]byte, blockSize) for i = 0; ;
 	i++ {
- blockLen := int64(blockSize) off := contentenc.HeaderLen + i*blockSize - iv := make([]byte, ivLen) - _, err := fd.ReadAt(iv, off)
- if err == io.EOF { - break - } else if err != nil { + n, err := fd.ReadAt(buf, off) + if err != nil && err != io.EOF {
 			errExit(err)
 		}
- tag := make([]byte, cryptocore.AuthTagLen) - _, err = fd.ReadAt(tag, off+blockSize-cryptocore.AuthTagLen) - if err == io.EOF { -
fi, err2 := fd.Stat() - if err2 != nil { - errExit(err2) - } - _, err2 = fd.ReadAt(tag, fi.Size()-cryptocore.AuthTagLen) - if err2
!= nil { - errExit(err2) - } - blockLen = (fi.Size() - contentenc.HeaderLen) % blockSize - } else if err != nil { - errExit(err) +
if n == 0 && err == io.EOF { + break + } + // A block contains at least the IV, the Auth Tag and 1 data byte + if n <
ivLen+authTagLen+1 { + errExit(fmt.Errorf("corrupt block: truncated data, len=%d", n)) + } + data := buf[:n] + // Parse block data +
iv := data[:ivLen] + tag := data[len(data)-authTagLen:] + if aessiv { + tag = data[ivLen : ivLen+authTagLen]
 		}
 		fmt.Printf("Block %2d: IV: %s, Tag: %s, Offset: %5d Len: %d\n", - i, hex.EncodeToString(iv),
hex.EncodeToString(tag), off, blockLen) + i, hex.EncodeToString(iv), hex.EncodeToString(tag), off, len(data))
 	}
 }
diff --git a/gocryptfs-xray/xray_tests/aessiv_fs.masterkey.txt b/gocryptfs-xray/xray_tests/aessiv_fs.masterkey.txt new file mode
100644 index 0000000..70835ac --- /dev/null +++ b/gocryptfs-xray/xray_tests/aessiv_fs.masterkey.txt @@ -0,0 +1,5 @@ +Your master key
is: + + 29dd219d-e227ff20-8474469d-9fc9fdc6- + b434ab35-404e808c-489d441e-2c1003f2 + diff --git
a/gocryptfs-xray/xray_tests/aessiv_fs.xray.txt b/gocryptfs-xray/xray_tests/aessiv_fs.xray.txt new file mode 100644 index
0000000..6a48079 --- /dev/null +++ b/gocryptfs-xray/xray_tests/aessiv_fs.xray.txt @@ -0,0 +1,3 @@ +Header: Version: 2, Id:
c2f21142e108952a47edfe16053d2bb9, assuming AES-SIV mode +Block 0: IV: 7621fdc35be7671ac6f369214436e8ff, Tag:
e8108c158b22cad6bb3296645357eb75, Offset: 18 Len: 4128 +Block 1: IV: f096d86a4dc3461ef17655cfcf865b13, Tag:
925f23d647e4ab7add2c8d36362cc5a9, Offset: 4146 Len: 936 diff --git a/gocryptfs-xray/xray_tests/aessiv_fs/Ldq-c4ADpM5iGSSrPjUAqQ
b/gocryptfs-xray/xray_tests/aessiv_fs/Ldq-c4ADpM5iGSSrPjUAqQ new file mode 100644 index 0000000..bfd4dfe Binary files /dev/null and
b/gocryptfs-xray/xray_tests/aessiv_fs/Ldq-c4ADpM5iGSSrPjUAqQ differ diff --git a/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.conf
b/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.conf new file mode 100644 index 0000000..9b8b95f --- /dev/null +++
b/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.conf @@ -0,0 +1,21 @@ +{ + "Creator": "gocryptfs v1.7-beta1-7-g6b94f5e", +
"EncryptedKey": "D0kHfg/pryMO9Ydo15EwpYjNHf3iWKq2GJyNocbjwJt9blEeMoLD5DnoARuDzQs54hblw+9MHwFjCSHYmJrFbA==", + "ScryptObject": { +
"Salt": "ehn0LM/Hy/4QkXAMCZq3c3p0O9G7gu5e3OQSR8MiJ6c=", + "N": 65536, + "R": 8, + "P": 1, + "KeyLen": 32 + }, + "Version": 2, +
"FeatureFlags": [ + "GCMIV128", + "HKDF", + "DirIV", + "EMENames", + "LongNames", + "Raw64", + "AESSIV" + ] +} diff --git
a/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.diriv b/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.diriv new file mode 100644
index 0000000..dd57ce1 --- /dev/null +++ b/gocryptfs-xray/xray_tests/aessiv_fs/gocryptfs.diriv @@ -0,0 +1 @@ +.¨Í1Aiõ&Á4—öÉ \
No newline at end of file diff --git a/gocryptfs-xray/xray_tests/xray_test.go b/gocryptfs-xray/xray_tests/xray_test.go index
a3374b0..8e5fc0c 100644 --- a/gocryptfs-xray/xray_tests/xray_test.go +++ b/gocryptfs-xray/xray_tests/xray_test.go @@ -24,3 +24,20 @@
func TestAesgcmXray(t *testing.T) {
 		fmt.Printf("have:\n%s", string(out))
 	}
 }
+ +func TestAessivXray(t *testing.T) { + expected, err := ioutil.ReadFile("aessiv_fs.xray.txt") + if err != nil { + t.Fatal(err) + }
+ cmd := exec.Command("../gocryptfs-xray", "-aessiv", "aessiv_fs/Ldq-c4ADpM5iGSSrPjUAqQ") + out, err := cmd.CombinedOutput() + if
err != nil { + t.Fatal(err) + } + if bytes.Compare(out, expected) != 0 { + t.Errorf("Unexpected output") +
fmt.Printf("expected:\n%s", string(expected)) + fmt.Printf("have:\n%s", string(out)) + } +}
 2019-01-04 19:10:36 +01:00
Jakob Unterwurzacher
30a8fda0a1 xray: add tests and example aes-gcm fs 
The single test compares the gocryptfs-xray output with the expected output.
 2019-01-04 19:02:36 +01:00
Jakob Unterwurzacher
cb524b60b4 Update changelog 2019-01-04 18:05:37 +01:00
Jakob Unterwurzacher
6b94f5ef51 reverse mode: -exclude: filter out excluded .name files 
Fixes https://github.com/rfjakob/gocryptfs/issues/286 :

While the actual file is properly excluded, the * .name file is still leaked in the directory listing:

```
drwxr-xr-x 2 sebastian sebastian 4,0K Dez 17 14:58 .
drwxr-xr-x 7 sebastian sebastian 4,0K Dez 17 14:45 ..
-r-------- 1 sebastian sebastian  408 Dez 17 14:56 gocryptfs.conf
-r--r--r-- 1 sebastian sebastian   16 Dez 17 14:58 gocryptfs.diriv
-r--r--r-- 1 sebastian sebastian  320 Dez 17 14:58 gocryptfs.longname.3vZ_r3eDPb1_fL3j5VA4rd_bcKWLKT9eaxOVIGK5HFA.name
```
 2019-01-04 17:59:00 +01:00
Jakob Unterwurzacher
58f62ada46 tests: reverse: verify that longname .name files are exluded as well 
Currently fails, will be fixed in the next commit.

https://github.com/rfjakob/gocryptfs/issues/286
 2019-01-04 17:57:57 +01:00
Jakob Unterwurzacher
75a3e2c2ee reverse mode: fix "-exclude" in "-plaintextnames" dir listings 
Excluded files showed up in directory listing like this:

 drwxr-xr-x 2 sebastian sebastian 4,0K Dez 17 14:48 .
 drwxr-xr-x 7 sebastian sebastian 4,0K Dez 17 14:45 ..
 -????????? ? ?         ?            ?            ? abcd
 -r-------- 1 sebastian sebastian  366 Dez 17 14:45 gocryptfs.conf

Fixes https://github.com/rfjakob/gocryptfs/issues/285
 2019-01-04 17:36:06 +01:00
Jakob Unterwurzacher
a2f83acc30 tests: fix VerifyExistence() helper, it missed unstat()able files 
VerifyExistence missed unstat()able files in the directory listing
because ioutil.ReadDir() filtered them out.

https://github.com/rfjakob/gocryptfs/issues/285
 2019-01-04 17:36:06 +01:00
Sebastian Lackner
cdb57ca7e0 fsck: Do not show files/directories without access permissions as corrupt. 
When running as a regular user, error EACCES does not necessarily mean that the
file/directory/xattr is corrupt, but just that we do not have sufficient access
permissions. Add a hint that running as root can be used to check everything.

Fixes: https://github.com/rfjakob/gocryptfs/issues/309
 2019-01-04 09:34:12 +01:00
Sebastian Lackner
acf7e52022 fusefrontend: Allow to create sparse file of size 4096. 
When the old size is zero, there are no existing blocks to merge the
new data with. Directly use Ftruncate if the size is block-aligned.

Fixes https://github.com/rfjakob/gocryptfs/issues/305
 2019-01-04 01:38:47 +01:00
Sebastian Lackner
ab169443fd A few more spelling fixes. 
Found with the 'codespell' utility.
 2019-01-04 01:23:44 +01:00
Jakob Unterwurzacher
c1bd262600 Update README for v1.7-beta1 2019-01-03 20:38:36 +01:00
Jakob Unterwurzacher
7248669e27 travis: bump clone depth to 300 
We are hitting the

	fatal: No names found, cannot describe anything.

problem in the symlink_race branch.
 2019-01-03 18:43:51 +01:00
Jakob Unterwurzacher
1c9fb707fe tests: overengineer extractloop_plot_csv.m a little 
Plot iteration time on second y axis, adjust line styles
 2019-01-03 18:24:14 +01:00
Sebastian Lackner
a1ba4b6576 Omit syscall.O_RDONLY flag when passing O_PATH. 
When O_PATH is specified in flags, flag bits other than O_CLOEXEC, O_DIRECTORY,
and O_NOFOLLOW are ignored.
 2019-01-03 18:24:05 +01:00
Sebastian Lackner
0414ef2572 fusefrontend: Use appropriate flags in decryptPathAt. 2019-01-03 18:24:05 +01:00
Sebastian Lackner
c0640ff3ef fusefrontend: Open directory with syscall.O_DIRECTORY in OpenDir. 2019-01-03 18:24:05 +01:00
Sebastian Lackner
078a431493 fusefrontend: Open directory with syscall.O_DIRECTORY in Rmdir. 2019-01-03 18:24:05 +01:00
Sebastian Lackner
885a341df6 fusefrontend: Do not Clear cache at end of Rmdir function. 
We already do 'defer fs.dirCache.Clear()', so this is no longer required.
 2019-01-03 18:24:05 +01:00
Sebastian Lackner
61241b0588 nametransform: Add implicit syscall.O_RDONLY flag. 2019-01-03 18:24:05 +01:00
Sebastian Lackner
927b3ce4cf syscallcompat: Use O_PATH to open base directory. 
Also remove some unnecessary flags: When O_PATH is specified in flags, flag
bits other than O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored.
 2019-01-03 18:24:05 +01:00
Sebastian Lackner
d86f9914ac fusefrontend: Remove debug code. 
This code was accidentially added in 4f66d66755.
 2019-01-03 18:24:05 +01:00
Jakob Unterwurzacher
71d07b7c73 tests: extractloop: renice to level 19 
Run at low priority to not annoy the user too much.
 2019-01-03 16:14:05 +01:00
Jakob Unterwurzacher
fcdb4bec09 fusefronted: dirCache: fix bug handling "" 
Bug looked like this:

  $ ls -l .
  total 0
  drwxrwxr-x. 2 jakob jakob 60 Jan  3 15:42 foo
  -rw-rw-r--. 1 jakob jakob  0 Jan  3 15:46 x

  $ ls -l .
  ls: cannot access '.': No such file or directory

(only happened when "" was in the dirCache)
 2019-01-03 15:59:54 +01:00
Jakob Unterwurzacher
bb9884549b tests: allow one extra fd in fd leak detector (dirCache) 
The gocryptfs process may keep one fd open for up to one second
in the dirCache.
 2019-01-03 15:38:51 +01:00
Jakob Unterwurzacher
4f66d66755 fusefrontend: add dirCache 2019-01-03 15:31:13 +01:00
Jakob Unterwurzacher
f6dad8d0fa nametransform: simplify WriteDirIV to WriteDirIVAt 
Un-spaghettify the function and let the callers open
the directory.
 2019-01-03 15:31:13 +01:00