ssh: don't err out on channel request msgs to unknown channels

rfc4254 section 5.4 states that channel request messages sent to an
unrecognized channel should be replied with a `SSH_MSG_CHANNEL_FAILURE`,
rather than erring out and closing the mux. This can occur with servers
like openssh-portable, which can begin to close a channel and also use
that channel for keepalives before it has received a closed response
from the client.

Fixes golang/go#38908

Change-Id: Id68b77e16b2889d3a21d505ed8018f9f457e067a
GitHub-Last-Rev: 8a92f87dc30697d9e3805af695efdf1b1dc8409b
GitHub-Pull-Request: golang/crypto#136
Run-TryBot: Filippo Valsorda <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Filippo Valsorda <>
2 files changed
tree: 38f8157090ddf4f06cd1240f98c8f861557b2c95
  1. acme/
  2. argon2/
  3. bcrypt/
  4. blake2b/
  5. blake2s/
  6. blowfish/
  7. bn256/
  8. cast5/
  9. chacha20/
  10. chacha20poly1305/
  11. cryptobyte/
  12. curve25519/
  13. ed25519/
  14. hkdf/
  15. internal/
  16. md4/
  17. nacl/
  18. ocsp/
  19. openpgp/
  20. otr/
  21. pbkdf2/
  22. pkcs12/
  23. poly1305/
  24. ripemd160/
  25. salsa20/
  26. scrypt/
  27. sha3/
  28. ssh/
  29. tea/
  30. twofish/
  31. xtea/
  32. xts/
  33. .gitattributes
  34. .gitignore
  36. codereview.cfg
  39. go.mod
  40. go.sum

Go Cryptography

This repository holds supplementary Go cryptography libraries.


The easiest way to install is to run go get -u You can also manually git clone the repository to $GOPATH/src/

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see

The main issue tracker for the crypto repository is located at Prefix your issue with “x/crypto:” in the subject line, so it is easy to find.

Note that contributions to the cryptography package receive additional scrutiny due to their sensitive nature. Patches may take longer than normal to receive feedback.