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push: support signing pushes iff the server supports it

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Add a new flag --sign=true (or --sign=false), which means the same
thing as the original --signed (or --no-signed).  Give it a third
value --sign=if-asked to tell push and send-pack to send a push
certificate if and only if the server advertised a push cert nonce.

If not, warn the user that their push may not be as secure as they
thought.

Signed-off-by: Dave Borowitz <dborowitz@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Dave Borowitz
2015-08-19 11:26:46 -04:00
committed by Junio C Hamano
parent 068c77a518
commit 30261094b1
10 changed files with 128 additions and 49 deletions
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43
send-pack.c
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@ -12,6 +12,29 @@
#include "version.h"
#include "sha1-array.h"
#include "gpg-interface.h"
#include "cache.h"
int option_parse_push_signed(const struct option *opt,
const char *arg, int unset)
{
if (unset) {
*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
return 0;
}
switch (git_parse_maybe_bool(arg)) {
case 1:
*(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
return 0;
case 0:
*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
return 0;
}
if (!strcasecmp("if-asked", arg)) {
*(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
return 0;
}
die("bad %s argument: %s", opt->long_name, arg);
}
static int feed_object(const unsigned char *sha1, int fd, int negative)
{
@ -370,14 +393,20 @@ int send_pack(struct send_pack_args *args,
args->use_thin_pack = 0;
if (server_supports("atomic"))
atomic_supported = 1;
if (args->push_cert) {
int len;
if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
int len;
push_cert_nonce = server_feature_value("push-cert", &len);
if (!push_cert_nonce)
if (push_cert_nonce) {
reject_invalid_nonce(push_cert_nonce, len);
push_cert_nonce = xmemdupz(push_cert_nonce, len);
} else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
die(_("the receiving end does not support --signed push"));
reject_invalid_nonce(push_cert_nonce, len);
push_cert_nonce = xmemdupz(push_cert_nonce, len);
} else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
warning(_("not sending a push certificate since the"
" receiving end does not support --signed"
" push"));
}
}
if (!remote_refs) {
@ -413,7 +442,7 @@ int send_pack(struct send_pack_args *args,
if (!args->dry_run)
advertise_shallow_grafts_buf(&req_buf);
if (!args->dry_run && args->push_cert)
if (!args->dry_run && push_cert_nonce)
cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
cap_buf.buf, push_cert_nonce);
@ -452,7 +481,7 @@ int send_pack(struct send_pack_args *args,
for (ref = remote_refs; ref; ref = ref->next) {
char *old_hex, *new_hex;
if (args->dry_run || args->push_cert)
if (args->dry_run || push_cert_nonce)
continue;
if (check_to_send_update(ref, args) < 0)