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8c735b11de
We added an "object-info" capability to the v2 upload-pack protocol in
a2ba162cda (object-info: support for retrieving object info,
2021-04-20). In the almost 3 years since, we have not added any
client-side support, and it does not appear to exist in other
implementations either (JGit understands the verb on the server side,
but not on the client side).
Since this largely unused code is accessible over the network by
default, it increases the attack surface of upload-pack. I don't know of
any particularly severe problem, but one issue is that because of the
request/response nature of the v2 protocol, it will happily read an
unbounded number of packets, adding each one to a string list (without
regard to whether they are objects we know about, duplicates, etc).
This may be something we want to improve in the long run, but in the
short term it makes sense to disable the feature entirely. We'll add a
config option as an escape hatch for anybody who wants to develop the
feature further.
A more gentle option would be to add the config option to let people
disable it manually, but leave it enabled by default. But given that
there's no client side support, that seems like the wrong balance with
security.
Disabling by default will slow adoption a bit once client-side support
does become available (there were some patches[1] in 2022, but nothing
got merged and there's been nothing since). But clients have to deal
with older servers that do not understand the option anyway (and the
capability system handles that), so it will just be a matter of servers
flipping their config at that point (and hopefully once any unbounded
allocations have been addressed).
[jk: this is a patch that GitHub has been running for several years, but
rebased forward and with a new commit message for upstream]
[1] https://lore.kernel.org/git/20220208231911.725273-1-calvinwan@google.com/
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
405 lines
9.5 KiB
Bash
Executable file
405 lines
9.5 KiB
Bash
Executable file
#!/bin/sh
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test_description='test protocol v2 server commands'
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GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
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export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
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TEST_PASSES_SANITIZE_LEAK=true
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. ./test-lib.sh
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test_expect_success 'test capability advertisement' '
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test_oid_cache <<-EOF &&
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wrong_algo sha1:sha256
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wrong_algo sha256:sha1
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EOF
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cat >expect.base <<-EOF &&
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version 2
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agent=git/$(git version | cut -d" " -f3)
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ls-refs=unborn
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fetch=shallow wait-for-done
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server-option
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object-format=$(test_oid algo)
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EOF
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cat >expect.trailer <<-EOF &&
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0000
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EOF
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cat expect.base expect.trailer >expect &&
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GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
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--advertise-capabilities >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'stateless-rpc flag does not list capabilities' '
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# Empty request
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test-tool pkt-line pack >in <<-EOF &&
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0000
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EOF
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test-tool serve-v2 --stateless-rpc >out <in &&
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test_must_be_empty out &&
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# EOF
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test-tool serve-v2 --stateless-rpc >out &&
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test_must_be_empty out
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'
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test_expect_success 'request invalid capability' '
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test-tool pkt-line pack >in <<-EOF &&
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foobar
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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test_grep "unknown capability" err
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'
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test_expect_success 'request with no command' '
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test-tool pkt-line pack >in <<-EOF &&
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agent=git/test
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object-format=$(test_oid algo)
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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test_grep "no command requested" err
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'
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test_expect_success 'request invalid command' '
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test-tool pkt-line pack >in <<-EOF &&
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command=foo
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object-format=$(test_oid algo)
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agent=git/test
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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test_grep "invalid command" err
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'
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test_expect_success 'request capability as command' '
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test-tool pkt-line pack >in <<-EOF &&
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command=agent
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object-format=$(test_oid algo)
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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grep invalid.command.*agent err
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'
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test_expect_success 'request command as capability' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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fetch
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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grep unknown.capability err
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'
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test_expect_success 'requested command is command=value' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs=whatever
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object-format=$(test_oid algo)
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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grep invalid.command.*ls-refs=whatever err
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'
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test_expect_success 'wrong object-format' '
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test-tool pkt-line pack >in <<-EOF &&
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command=fetch
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agent=git/test
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object-format=$(test_oid wrong_algo)
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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test_grep "mismatched object format" err
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'
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# Test the basics of ls-refs
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#
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test_expect_success 'setup some refs and tags' '
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test_commit one &&
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git branch dev main &&
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test_commit two &&
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git symbolic-ref refs/heads/release refs/heads/main &&
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git tag -a -m "annotated tag" annotated-tag
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'
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test_expect_success 'basics of ls-refs' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse HEAD) HEAD
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$(git rev-parse refs/heads/dev) refs/heads/dev
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$(git rev-parse refs/heads/main) refs/heads/main
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$(git rev-parse refs/heads/release) refs/heads/release
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$(git rev-parse refs/tags/annotated-tag) refs/tags/annotated-tag
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$(git rev-parse refs/tags/one) refs/tags/one
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$(git rev-parse refs/tags/two) refs/tags/two
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'ls-refs complains about unknown options' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0001
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no-such-arg
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0000
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
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grep unexpected.line.*no-such-arg err
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'
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test_expect_success 'basic ref-prefixes' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0001
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ref-prefix refs/heads/main
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ref-prefix refs/tags/one
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse refs/heads/main) refs/heads/main
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$(git rev-parse refs/tags/one) refs/tags/one
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'refs/heads prefix' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0001
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ref-prefix refs/heads/
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse refs/heads/dev) refs/heads/dev
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$(git rev-parse refs/heads/main) refs/heads/main
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$(git rev-parse refs/heads/release) refs/heads/release
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'ignore very large set of prefixes' '
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# generate a large number of ref-prefixes that we expect
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# to match nothing; the value here exceeds TOO_MANY_PREFIXES
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# from ls-refs.c.
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{
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echo command=ls-refs &&
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echo object-format=$(test_oid algo) &&
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echo 0001 &&
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perl -le "print \"ref-prefix refs/heads/\$_\" for (1..65536)" &&
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echo 0000
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} |
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test-tool pkt-line pack >in &&
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# and then confirm that we see unmatched prefixes anyway (i.e.,
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# that the prefix was not applied).
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cat >expect <<-EOF &&
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$(git rev-parse HEAD) HEAD
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$(git rev-parse refs/heads/dev) refs/heads/dev
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$(git rev-parse refs/heads/main) refs/heads/main
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$(git rev-parse refs/heads/release) refs/heads/release
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$(git rev-parse refs/tags/annotated-tag) refs/tags/annotated-tag
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$(git rev-parse refs/tags/one) refs/tags/one
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$(git rev-parse refs/tags/two) refs/tags/two
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'peel parameter' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0001
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peel
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ref-prefix refs/tags/
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse refs/tags/annotated-tag) refs/tags/annotated-tag peeled:$(git rev-parse refs/tags/annotated-tag^{})
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$(git rev-parse refs/tags/one) refs/tags/one
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$(git rev-parse refs/tags/two) refs/tags/two
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'symrefs parameter' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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0001
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symrefs
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ref-prefix refs/heads/
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse refs/heads/dev) refs/heads/dev
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$(git rev-parse refs/heads/main) refs/heads/main
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$(git rev-parse refs/heads/release) refs/heads/release symref-target:refs/heads/main
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'sending server-options' '
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test-tool pkt-line pack >in <<-EOF &&
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command=ls-refs
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object-format=$(test_oid algo)
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server-option=hello
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server-option=world
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0001
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ref-prefix HEAD
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0000
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EOF
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cat >expect <<-EOF &&
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$(git rev-parse HEAD) HEAD
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'unexpected lines are not allowed in fetch request' '
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git init server &&
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test-tool pkt-line pack >in <<-EOF &&
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command=fetch
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object-format=$(test_oid algo)
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0001
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this-is-not-a-command
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0000
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EOF
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(
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cd server &&
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test_must_fail test-tool serve-v2 --stateless-rpc
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) <in >/dev/null 2>err &&
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grep "unexpected line: .this-is-not-a-command." err
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'
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# Test the basics of object-info
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#
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test_expect_success 'basics of object-info' '
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test_config transfer.advertiseObjectInfo true &&
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test-tool pkt-line pack >in <<-EOF &&
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command=object-info
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object-format=$(test_oid algo)
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0001
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size
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oid $(git rev-parse two:two.t)
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oid $(git rev-parse two:two.t)
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0000
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EOF
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cat >expect <<-EOF &&
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size
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$(git rev-parse two:two.t) $(wc -c <two.t | xargs)
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$(git rev-parse two:two.t) $(wc -c <two.t | xargs)
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0000
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EOF
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test-tool serve-v2 --stateless-rpc <in >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'test capability advertisement with uploadpack.advertiseBundleURIs' '
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test_config uploadpack.advertiseBundleURIs true &&
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cat >expect.extra <<-EOF &&
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bundle-uri
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EOF
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cat expect.base \
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expect.extra \
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expect.trailer >expect &&
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GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
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--advertise-capabilities >out &&
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test-tool pkt-line unpack <out >actual &&
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test_cmp expect actual
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'
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test_expect_success 'basics of bundle-uri: dies if not enabled' '
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test-tool pkt-line pack >in <<-EOF &&
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command=bundle-uri
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0000
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EOF
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cat >err.expect <<-\EOF &&
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fatal: invalid command '"'"'bundle-uri'"'"'
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EOF
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cat >expect <<-\EOF &&
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ERR serve: invalid command '"'"'bundle-uri'"'"'
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc <in >out 2>err.actual &&
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test_cmp err.expect err.actual &&
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test_must_be_empty out
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'
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test_expect_success 'object-info missing from capabilities when disabled' '
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test_config transfer.advertiseObjectInfo false &&
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GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
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--advertise-capabilities >out &&
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test-tool pkt-line unpack <out >actual &&
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! grep object.info actual
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'
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test_expect_success 'object-info commands rejected when disabled' '
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test_config transfer.advertiseObjectInfo false &&
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test-tool pkt-line pack >in <<-EOF &&
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command=object-info
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EOF
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test_must_fail test-tool serve-v2 --stateless-rpc <in 2>err &&
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grep invalid.command err
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'
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test_done
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