When accepting a signed push (see linkgit:git-push[1]), the signed
push certificate is stored in a blob and an environment variable
`GIT_PUSH_CERT` can be consulted for its object name. See the
-description of `post-receive` hook for an example.
+description of `post-receive` hook for an example. In addition, the
+certificate is verified using GPG and the result is exported with
+the following environment variables:
+
+`GIT_PUSH_CERT_SIGNER`::
+ The name and the e-mail address of the owner of the key that
+ signed the push certificate.
+
+`GIT_PUSH_CERT_KEY`::
+ The GPG key ID of the key that signed the push certificate.
+
+`GIT_PUSH_CERT_STATUS`::
+ The status of GPG verification of the push certificate,
+ using the same mnemonic as used in `%G?` format of `git log`
+ family of commands (see linkgit:git-log[1]).
This hook is called before any refname is updated and before any
fast-forward checks are performed.
0\{40}, otherwise sha1-old and sha1-new should be valid objects in
the repository.
-The `GIT_PUSH_CERT` environment variable can be inspected, just as
+The `GIT_PUSH_CERT*` environment variables can be inspected, just as
in `pre-receive` hook, after accepting a signed push.
Using this hook, it is easy to generate mails describing the updates
to the repository. This example script sends one mail message per
ref listing the commits pushed to the repository, and logs the push
-certificates of signed pushes to a logger
+certificates of signed pushes with good signatures to a logger
service:
#!/bin/sh
mail -s "Changes to ref $ref" commit-list@mydomain
done
# log signed push certificate, if any
- if test -n "${GIT_PUSH_CERT-}"
+ if test -n "${GIT_PUSH_CERT-}" && test ${GIT_PUSH_CERT_STATUS} = G
then
(
git cat-file blob ${GIT_PUSH_CERT}
- ) | mail -s "push certificate" push-log@mydomain
+ ) | mail -s "push certificate from $GIT_PUSH_CERT_SIGNER" push-log@mydomain
fi
exit 0
#include "connected.h"
#include "argv-array.h"
#include "version.h"
+#include "tag.h"
+#include "gpg-interface.h"
static const char receive_pack_usage[] = "git receive-pack <git-dir>";
static int accept_push_cert = 1;
static struct strbuf push_cert = STRBUF_INIT;
static unsigned char push_cert_sha1[20];
+static struct signature_check sigcheck;
static enum deny_action parse_deny_action(const char *var, const char *value)
{
return;
if (!already_done) {
+ struct strbuf gpg_output = STRBUF_INIT;
+ struct strbuf gpg_status = STRBUF_INIT;
+ int bogs /* beginning_of_gpg_sig */;
+
already_done = 1;
if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
hashclr(push_cert_sha1);
+
+ memset(&sigcheck, '\0', sizeof(sigcheck));
+ sigcheck.result = 'N';
+
+ bogs = parse_signature(push_cert.buf, push_cert.len);
+ if (verify_signed_buffer(push_cert.buf, bogs,
+ push_cert.buf + bogs, push_cert.len - bogs,
+ &gpg_output, &gpg_status) < 0) {
+ ; /* error running gpg */
+ } else {
+ sigcheck.payload = push_cert.buf;
+ sigcheck.gpg_output = gpg_output.buf;
+ sigcheck.gpg_status = gpg_status.buf;
+ parse_gpg_output(&sigcheck);
+ }
+
+ strbuf_release(&gpg_output);
+ strbuf_release(&gpg_status);
}
if (!is_null_sha1(push_cert_sha1)) {
argv_array_pushf(&env, "GIT_PUSH_CERT=%s", sha1_to_hex(push_cert_sha1));
+ argv_array_pushf(&env, "GIT_PUSH_CERT_SIGNER=%s",
+ sigcheck.signer ? sigcheck.signer : "");
+ argv_array_pushf(&env, "GIT_PUSH_CERT_KEY=%s",
+ sigcheck.key ? sigcheck.key : "");
+ argv_array_pushf(&env, "GIT_PUSH_CERT_STATUS=%c", sigcheck.result);
+
proc->env = env.argv;
}
}
if test -n "${GIT_PUSH_CERT-}"
then
git cat-file blob $GIT_PUSH_CERT >../push-cert
- fi
+ fi &&
+
+ cat >../push-cert-status <<E_O_F
+ SIGNER=${GIT_PUSH_CERT_SIGNER-nobody}
+ KEY=${GIT_PUSH_CERT_KEY-nokey}
+ STATUS=${GIT_PUSH_CERT_STATUS-nostatus}
+ E_O_F
+
+ EOF
+
+ cat >expect <<-\EOF &&
+ SIGNER=C O Mitter <committer@example.com>
+ KEY=13B6F51ECDDE430D
+ STATUS=G
EOF
git push --signed dst noop ff +noff &&
grep "$(git rev-parse noop ff) refs/heads/ff" dst/push-cert &&
- grep "$(git rev-parse noop noff) refs/heads/noff" dst/push-cert
+ grep "$(git rev-parse noop noff) refs/heads/noff" dst/push-cert &&
+ test_cmp expect dst/push-cert-status
'
test_done