[PATCH 4/4] upload-pack: only accept packfile-uris if we advertised it
- From
Jeff King <peff@peff.net>
- Date
- Feb 28, 2024, 22:50 UTC
- Message-ID
- <20240228225050.GA1159078@coredump.intra.peff.net>
- In-Reply-To
- <20240228224625.GA1158651@coredump.intra.peff.net>
Clients are only supposed to request particular capabilities or features if the server advertised them. For the "packfile-uris" feature, we only advertise it if uploadpack.blobpacfileuri is set, but we always accept a request from the client regardless.
In practice this doesn't really hurt anything, as we'd pass the client's protocol list on to pack-objects, which ends up ignoring it. But we should try to follow the protocol spec, and tightening this up may catch buggy or misbehaving clients more easily.
Thanks to recent refactoring, we can hoist the config check from upload_pack_advertise() into upload_pack_config(). Note the subtle handling of a value-less bool (which does not count for triggering an advertisement).
Signed-off-by: Jeff King <peff@peff.net> --- I suspect in the long term that we may have other ways to trigger this feature than the static blobpackfileuri config (e.g., a hook that knows about site-specific packfiles "somehow"). So we may need to update the test later for that, but presumably in the vanilla config we'll continue to skip advertising it.
t/t5702-protocol-v2.sh | 18 ++++++++++++++++++ upload-pack.c | 16 +++++++--------- 2 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh index 6ef4971845..902e42c1c0 100755 --- a/t/t5702-protocol-v2.sh +++ b/t/t5702-protocol-v2.sh @@ -778,6 +778,24 @@ test_expect_success 'archive with custom path does not request v2' ' ! grep ^GIT_PROTOCOL env.trace ' +test_expect_success 'reject client packfile-uris if not advertised' ' + { + packetize command=fetch && + printf 0001 && + packetize packfile-uris https && + packetize done && + printf 0000 + } >input && + test_must_fail env GIT_PROTOCOL=version=2 \ + git upload-pack client <input && + test_must_fail env GIT_PROTOCOL=version=2 \ + git -c uploadpack.blobpackfileuri \ + upload-pack client <input && + GIT_PROTOCOL=version=2 \ + git -c uploadpack.blobpackfileuri=anything \ + upload-pack client <input +' + # Test protocol v2 with 'http://' transport # . "$TEST_DIRECTORY"/lib-httpd.sh diff --git a/upload-pack.c b/upload-pack.c index 491ef51daa..66f4de9d87 100644 --- a/upload-pack.c +++ b/upload-pack.c @@ -113,6 +113,7 @@ struct upload_pack_data { unsigned done : 1; /* v2 only */ unsigned allow_ref_in_want : 1; /* v2 only */ unsigned allow_sideband_all : 1; /* v2 only */ + unsigned allow_packfile_uris : 1; /* v2 only */ unsigned advertise_sid : 1; unsigned sent_capabilities : 1; }; @@ -1362,6 +1363,9 @@ static int upload_pack_config(const char *var, const char *value, data->allow_ref_in_want = git_config_bool(var, value); } else if (!strcmp("uploadpack.allowsidebandall", var)) { data->allow_sideband_all = git_config_bool(var, value); + } else if (!strcmp("uploadpack.blobpackfileuri", var)) { + if (value) + data->allow_packfile_uris = 1; } else if (!strcmp("core.precomposeunicode", var)) { precomposed_unicode = git_config_bool(var, value); } else if (!strcmp("transfer.advertisesid", var)) { @@ -1647,7 +1651,8 @@ static void process_args(struct packet_reader *request, continue; } - if (skip_prefix(arg, "packfile-uris ", &p)) { + if (data->allow_packfile_uris && + skip_prefix(arg, "packfile-uris ", &p)) { string_list_split(&data->uri_protocols, p, ',', -1); continue; } @@ -1847,8 +1852,6 @@ int upload_pack_advertise(struct repository *r, get_upload_pack_config(r, &data); if (value) { - char *str = NULL; - strbuf_addstr(value, "shallow wait-for-done"); if (data.allow_filter) @@ -1860,13 +1863,8 @@ int upload_pack_advertise(struct repository *r, if (data.allow_sideband_all) strbuf_addstr(value, " sideband-all"); - if (!repo_config_get_string(r, - "uploadpack.blobpackfileuri", - &str) && - str) { + if (data.allow_packfile_uris) strbuf_addstr(value, " packfile-uris"); - free(str); - } } upload_pack_data_clear(&data);
-- 2.44.0.rc2.424.gbdbf4d014b