Commit Graph

21 Commits

Author SHA1 Message Date
Jakob Borg
2dc2aa5d21
lib/connections, lib/tlsutil: Handle certName in Go 1.15 (fixes #6867) (#6868)
Our authentication is based on device ID (certificate fingerprint) but
we also check the certificate name for ... historical extra security
reasons. (I don't think this adds anything but it is what it is.) Since
that check breaks in Go 1.15 this change does two things:

- Adds a manual check for the peer certificate CommonName, and if they
  are equal we are happy and don't call the more advanced
  VerifyHostname() function. This allows our old style certificates to
  still pass the check.

- Adds the cert name "syncthing" as a DNS SAN when generating the
  certificate. This is the correct way nowadays and makes VerifyHostname()
  happy in Go 1.15 as well, even without the above patch.
2020-07-30 13:36:11 +02:00
greatroar
273cc9cef8
lib/rand: Various minor fixes (#6752)
crypto/rand output is cryptographically secure by the Go library
documentation's promise. That, rather than strength (= passes randomness
tests) is the property that Syncthing needs).
2020-06-17 10:43:58 +02:00
Jakob Borg
dd92b2b8f4
all: Tweak error creation (#6391)
- In the few places where we wrap errors, use the new Go 1.13 "%w"
  construction instead of %s or %v.

- Where we create errors with constant strings, consistently use
  errors.New and not fmt.Errorf.

- Remove capitalization from errors in the few places where we had that.
2020-03-03 22:40:00 +01:00
Simon Frei
cf312abc72 lib: Wrap errors with errors.Wrap instead of fmt.Errorf (#6181) 2019-11-23 15:20:54 +00:00
Jakob Borg
1d99e5277a all: Cleanups enabled by Go 1.12 2019-11-10 10:16:10 +01:00
Jakob Borg
879f51b027 lib/tlsutil: Remove Go 1.12 TLS 1.3 beta opt-in
Go 1.13 enables this by default.
2019-11-10 09:32:48 +01:00
Jakob Borg
4736cccda1
all: Update certificate lifetimes (fixes #6036) (#6078)
This adds a certificate lifetime parameter to our certificate generation
and hard codes it to twenty years in some uninteresting places. In the
main binary there are a couple of constants but it results in twenty
years for the device certificate and 820 days for the HTTPS one. 820 is
less than the 825 maximum Apple allows nowadays.

This also means we must be prepared for certificates to expire, so I add
some handling for that and generate a new certificate when needed. For
self signed certificates we regenerate a month ahead of time. For other
certificates we leave well enough alone.
2019-10-16 20:31:46 +02:00
Jakob Borg
720a6bf62e lib/tlsutil: Remove hardcoded curve preferences (fixes #5940) (#5942)
They are arguable outdated and we are better off trusting the standard
library than trying to keep up with it ourselves.
2019-08-11 19:01:57 +02:00
Jakob Borg
f24676ba5a
lib/tlsutil: Enable TLS 1.3 when available, on test builds (fixes #5065) (#5558)
* lib/tlsutil: Enable TLS 1.3 when available, on test builds (fixes #5065)

This enables TLS 1.3 negotiation on Go 1.12 by setting the GODEBUG
variable. For now, this just gets enabled on test versions (those with a
dash in the version number).

Users wishing to enable this on production builds can set GODEBUG
manually.

The string representation of connections now includes the TLS version
and cipher suite. This becomes part of the log output on connections.
That is, when talking to an old client:

    Established secure connection .../TLS1.2-TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

and now potentially:

    Established secure connection .../TLS1.3-TLS_AES_128_GCM_SHA256

(The cipher suite was there previously in the log output, but not the
TLS version.)

I also added this info as a new Crypto() method on the connection, and
propagate this out to the API and GUI, where it can be seen in the
connection address hover (although with bad word wrapping sometimes).

* wip

* wip
2019-02-26 11:49:02 +01:00
Jakob Borg
c2ddc83509 all: Revert the underscore sillyness 2019-02-02 12:16:27 +01:00
Jakob Borg
0b2cabbc31
all: Even more boring linter fixes (#5501) 2019-02-02 11:45:17 +01:00
Jakob Borg
8519a24ba6
cmd/*, lib/tlsutil: Refactor TLS stuff (fixes #5256) (#5276)
This changes the TLS and certificate handling in a few ways:

- We always use TLS 1.2, both for sync connections (as previously) and
  the GUI/REST/discovery stuff. This is a tightening of the requirements
  on the GUI. AS far as I can tell from caniusethis.com every browser from
  2013 and forward supports TLS 1.2, so I think we should be fine.

- We always greate ECDSA certificates. Previously we'd create
  ECDSA-with-RSA certificates for sync connections and pure RSA
  certificates for the web stuff. The new default is more modern and the
  same everywhere. These certificates are OK in TLS 1.2.

- We use the Go CPU detection stuff to choose the cipher suites to use,
  indirectly. The TLS package uses CPU capabilities probing to select
  either AES-GCM (fast if we have AES-NI) or ChaCha20 (faster if we
  don't). These CPU detection things aren't exported though, so the tlsutil
  package now does a quick TLS handshake with itself as part of init().
  If the chosen cipher suite was AES-GCM we prioritize that, otherwise we
  prefer ChaCha20. Some might call this ugly. I think it's awesome.
2018-10-21 14:17:50 +09:00
Jakob Borg
4b6e7e7867 lib/tlsutil: Remove undesired bufio from UnionedConnection (ref #4245)
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4335
2017-08-31 07:34:48 +00:00
Jakob Borg
f7fc0c1d3e all: Update license url to https (ref #3976) 2017-02-09 08:04:16 +01:00
Jakob Borg
a4ed50ca85 build, lib: Correct total test coverage calculation
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3483
2016-08-08 16:29:32 +00:00
Jakob Borg
e6b78e5d56 lib/rand: Break out random functions into separate package
The intention for this package is to provide a combination of the
security of crypto/rand and the convenience of math/rand. It should be
the first choice of random data unless ultimate performance is required
and the usage is provably irrelevant from a security standpoint.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3186
2016-05-26 07:02:56 +00:00
Jakob Borg
6d11006b54 Generate ECDSA keys instead of RSA
This replaces the current 3072 bit RSA certificates with 384 bit ECDSA
certificates. The advantage is these certificates are smaller and
essentially instantaneous to generate. According to RFC4492 (ECC Cipher
Suites for TLS), Table 1: Comparable Key Sizes, ECC has comparable
strength to 3072 bit RSA at 283 bits - so we exceed that.

There is no compatibility issue with existing Syncthing code - this is
verified by the integration test ("h2" instance has the new
certificate).

There are browsers out there that don't understand ECC certificates yet,
although I think they're dying out. In the meantime, I've retained the
RSA code for the HTTPS certificate, but pulled it down to 2048 bits. I
don't think a higher security level there is motivated, is this matches
current industry standard for HTTPS certificates.
2015-11-27 09:15:12 +01:00
Jakob Borg
64354b51c9 Generate certs with SHA256 signature instead of SHA1
Doesn't matter at all for BEP, but the same stuff is used by the web UI
and modern browsers are starting to dislike SHA1 extra much.
2015-09-09 12:55:17 +02:00
AudriusButkevicius
3d6ea23511 Clarify names 2015-09-02 22:00:51 +01:00
AudriusButkevicius
61130ea191 Add AcceptNoWrap to DowngradingListener 2015-09-02 21:25:56 +01:00
AudriusButkevicius
3299438cbd Move TLS utilities into a separate package 2015-09-02 21:05:54 +01:00