diff options
| author | Junio C Hamano <gitster@pobox.com> | 2014-08-22 03:45:30 +0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2014-09-18 01:27:40 +0400 |
| commit | b89363e4a5277038629491f8765c0598f366326c (patch) | |
| tree | 254c02373450167a86f33afdeac9cd851859ca00 /Documentation/config.txt | |
| parent | 9be89160e7382a88e56a02bcf38f4694dd6542d6 (diff) | |
signed push: fortify against replay attacks
In order to prevent a valid push certificate for pushing into an
repository from getting replayed in a different push operation, send
a nonce string from the receive-pack process and have the signer
include it in the push certificate. The receiving end uses an HMAC
hash of the path to the repository it serves and the current time
stamp, hashed with a secret seed (the secret seed does not have to
be per-repository but can be defined in /etc/gitconfig) to generate
the nonce, in order to ensure that a random third party cannot forge
a nonce that looks like it originated from it.
The original nonce is exported as GIT_PUSH_CERT_NONCE for the hooks
to examine and match against the value on the "nonce" header in the
certificate to notice a replay, but returned "nonce" header in the
push certificate is examined by receive-pack and the result is
exported as GIT_PUSH_CERT_NONCE_STATUS, whose value would be "OK"
if the nonce recorded in the certificate matches what we expect, so
that the hooks can more easily check.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/config.txt')
| -rw-r--r-- | Documentation/config.txt | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/config.txt b/Documentation/config.txt index 0d01e32888..dd6fd65e9f 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -2038,17 +2038,17 @@ rebase.autostash:: successful rebase might result in non-trivial conflicts. Defaults to false. -receive.acceptpushcert:: - By default, `git receive-pack` will advertise that it - accepts `git push --signed`. Setting this variable to - false disables it (this is a tentative variable that - will go away at the end of this series). - receive.autogc:: By default, git-receive-pack will run "git-gc --auto" after receiving data from git-push and updating refs. You can stop it by setting this variable to false. +receive.certnonceseed:: + By setting this variable to a string, `git receive-pack` + will accept a `git push --signed` and verifies it by using + a "nonce" protected by HMAC using this string as a secret + key. + receive.fsckObjects:: If it is set to true, git-receive-pack will check all received objects. It will abort in the case of a malformed object or a |