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signed push: add "pushee" header to push certificate

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Record the URL of the intended recipient for a push (after
anonymizing it if it has authentication material) on a new "pushee
URL" header.  Because the networking configuration (SSH-tunnels,
proxies, etc.) on the pushing user's side varies, the receiving
repository may not know the single canonical URL all the pushing
users would refer it as (besides, many sites allow pushing over
ssh://host/path and https://host/path protocols to the same
repository but with different local part of the path).  So this
value may not be reliably used for replay-attack prevention
purposes, but this will still serve as a human readable hint to
identify the repository the certificate refers to.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2014-08-22 18:15:24 -07:00
parent 4adf569dea
commit 9be89160e7
4 changed files with 13 additions and 0 deletions
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6
Documentation/technical/pack-protocol.txt
View File

@ -484,6 +484,7 @@ references.
push-cert = PKT-LINE("push-cert" NUL capability-list LF)
PKT-LINE("certificate version 0.1" LF)
PKT-LINE("pusher" SP ident LF)
PKT-LINE("pushee" SP url LF)
PKT-LINE(LF)
*PKT-LINE(command LF)
*PKT-LINE(gpg-signature-lines LF)
@ -527,6 +528,11 @@ Currently, the following header fields are defined:
Identify the GPG key in "Human Readable Name <email@address>"
format.
`pushee` url::
The repository URL (anonymized, if the URL contains
authentication material) the user who ran `git push`
intended to push into.
The GPG signature lines are a detached signature for the contents
recorded in the push certificate before the signature block begins.
The detached signature is used to certify that the commands were

5
send-pack.c
View File

@ -240,6 +240,11 @@ static int generate_push_cert(struct strbuf *req_buf,
datestamp(stamp, sizeof(stamp));
strbuf_addf(&cert, "certificate version 0.1\n");
strbuf_addf(&cert, "pusher %s %s\n", signing_key, stamp);
if (args->url && *args->url) {
char *anon_url = transport_anonymize_url(args->url);
strbuf_addf(&cert, "pushee %s\n", anon_url);
free(anon_url);
}
strbuf_addstr(&cert, "\n");
for (ref = remote_refs; ref; ref = ref->next) {

1
send-pack.h
View File

@ -2,6 +2,7 @@
#define SEND_PACK_H
struct send_pack_args {
const char *url;
unsigned verbose:1,
quiet:1,
porcelain:1,

1
transport.c
View File

@ -827,6 +827,7 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
args.url = transport->url;
ret = send_pack(&args, data->fd, data->conn, remote_refs,
&data->extra_have);