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git/t/t5570-git-daemon.sh
Jeff King ed15e58efe daemon: fix length computation in newline stripping
When git-daemon gets a pktline request, we strip off any
trailing newline, replacing it with a NUL. Clients prior to
5ad312bede (in git v1.4.0) would send:

  git-upload-pack repo.git\n

and we need to strip it off to understand their request.
After 5ad312bede, we send the host attribute but no newline,
like:

  git-upload-pack repo.git\0host=example.com\0

Both of these are parsed correctly by git-daemon. But if
some client were to combine the two:

  git-upload-pack repo.git\n\0host=example.com\0

we don't parse it correctly. The problem is that we use the
"len" variable to record the position of the NUL separator,
but then decrement it when we strip the newline. So we start
with:

  git-upload-pack repo.git\n\0host=example.com\0
                             ^-- len

and end up with:

  git-upload-pack repo.git\0\0host=example.com\0
                           ^-- len

This is arguably correct, since "len" tells us the length of
the initial string, but we don't actually use it for that.
What we do use it for is finding the offset of the extended
attributes; they used to be at len+1, but are now at len+2.

We can solve that by just leaving "len" where it is. We
don't have to care about the length of the shortened string,
since we just treat it like a C string.

No version of Git ever produced such a string, but it seems
like the daemon code meant to handle this case (and it seems
like a reasonable thing for somebody to do in a 3rd-party
implementation).

Reported-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-01-25 13:50:17 -08:00

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#!/bin/sh
test_description='test fetching over git protocol'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-git-daemon.sh
start_git_daemon
check_verbose_connect () {
grep -F "Looking up 127.0.0.1 ..." stderr &&
grep -F "Connecting to 127.0.0.1 (port " stderr &&
grep -F "done." stderr
}
test_expect_success 'setup repository' '
git config push.default matching &&
echo content >file &&
git add file &&
git commit -m one
'
test_expect_success 'create git-accessible bare repository' '
mkdir "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git" &&
(cd "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git" &&
git --bare init &&
: >git-daemon-export-ok
) &&
git remote add public "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git" &&
git push public master:master
'
test_expect_success 'clone git repository' '
git clone -v "$GIT_DAEMON_URL/repo.git" clone 2>stderr &&
check_verbose_connect &&
test_cmp file clone/file
'
test_expect_success 'fetch changes via git protocol' '
echo content >>file &&
git commit -a -m two &&
git push public &&
(cd clone && git pull -v) 2>stderr &&
check_verbose_connect &&
test_cmp file clone/file
'
test_expect_success 'no-op fetch -v stderr is as expected' '
(cd clone && git fetch -v) 2>stderr &&
check_verbose_connect
'
test_expect_success 'no-op fetch without "-v" is quiet' '
(cd clone && git fetch) 2>stderr &&
! test -s stderr
'
test_expect_success 'remote detects correct HEAD' '
git push public master:other &&
(cd clone &&
git remote set-head -d origin &&
git remote set-head -a origin &&
git symbolic-ref refs/remotes/origin/HEAD > output &&
echo refs/remotes/origin/master > expect &&
test_cmp expect output
)
'
test_expect_success 'prepare pack objects' '
cp -R "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo.git "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_pack.git &&
(cd "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_pack.git &&
git --bare repack -a -d
)
'
test_expect_success 'fetch notices corrupt pack' '
cp -R "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_pack.git "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_bad1.git &&
(cd "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_bad1.git &&
p=$(ls objects/pack/pack-*.pack) &&
chmod u+w $p &&
printf %0256d 0 | dd of=$p bs=256 count=1 seek=1 conv=notrunc
) &&
mkdir repo_bad1.git &&
(cd repo_bad1.git &&
git --bare init &&
test_must_fail git --bare fetch "$GIT_DAEMON_URL/repo_bad1.git" &&
test 0 = $(ls objects/pack/pack-*.pack | wc -l)
)
'
test_expect_success 'fetch notices corrupt idx' '
cp -R "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_pack.git "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_bad2.git &&
(cd "$GIT_DAEMON_DOCUMENT_ROOT_PATH"/repo_bad2.git &&
p=$(ls objects/pack/pack-*.idx) &&
chmod u+w $p &&
printf %0256d 0 | dd of=$p bs=256 count=1 seek=1 conv=notrunc
) &&
mkdir repo_bad2.git &&
(cd repo_bad2.git &&
git --bare init &&
test_must_fail git --bare fetch "$GIT_DAEMON_URL/repo_bad2.git" &&
test 0 = $(ls objects/pack | wc -l)
)
'
test_remote_error()
{
do_export=YesPlease
while test $# -gt 0
do
case $1 in
-x)
shift
chmod -x "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git"
;;
-n)
shift
do_export=
;;
*)
break
esac
done
msg=$1
shift
cmd=$1
shift
repo=$1
shift || error "invalid number of arguments"
if test -x "$GIT_DAEMON_DOCUMENT_ROOT_PATH/$repo"
then
if test -n "$do_export"
then
: >"$GIT_DAEMON_DOCUMENT_ROOT_PATH/$repo/git-daemon-export-ok"
else
rm -f "$GIT_DAEMON_DOCUMENT_ROOT_PATH/$repo/git-daemon-export-ok"
fi
fi
test_must_fail git "$cmd" "$GIT_DAEMON_URL/$repo" "$@" 2>output &&
test_i18ngrep "fatal: remote error: $msg: /$repo" output &&
ret=$?
chmod +x "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git"
(exit $ret)
}
msg="access denied or repository not exported"
test_expect_success 'clone non-existent' "test_remote_error '$msg' clone nowhere.git "
test_expect_success 'push disabled' "test_remote_error '$msg' push repo.git master"
test_expect_success 'read access denied' "test_remote_error -x '$msg' fetch repo.git "
test_expect_success 'not exported' "test_remote_error -n '$msg' fetch repo.git "
stop_git_daemon
start_git_daemon --informative-errors
test_expect_success 'clone non-existent' "test_remote_error 'no such repository' clone nowhere.git "
test_expect_success 'push disabled' "test_remote_error 'service not enabled' push repo.git master"
test_expect_success 'read access denied' "test_remote_error -x 'no such repository' fetch repo.git "
test_expect_success 'not exported' "test_remote_error -n 'repository not exported' fetch repo.git "
stop_git_daemon
start_git_daemon --interpolated-path="$GIT_DAEMON_DOCUMENT_ROOT_PATH/%H%D"
test_expect_success 'access repo via interpolated hostname' '
repo="$GIT_DAEMON_DOCUMENT_ROOT_PATH/localhost/interp.git" &&
git init --bare "$repo" &&
git push "$repo" HEAD &&
>"$repo"/git-daemon-export-ok &&
GIT_OVERRIDE_VIRTUAL_HOST=localhost \
git ls-remote "$GIT_DAEMON_URL/interp.git" &&
GIT_OVERRIDE_VIRTUAL_HOST=LOCALHOST \
git ls-remote "$GIT_DAEMON_URL/interp.git"
'
test_expect_success 'hostname cannot break out of directory' '
repo="$GIT_DAEMON_DOCUMENT_ROOT_PATH/../escape.git" &&
git init --bare "$repo" &&
git push "$repo" HEAD &&
>"$repo"/git-daemon-export-ok &&
test_must_fail \
env GIT_OVERRIDE_VIRTUAL_HOST=.. \
git ls-remote "$GIT_DAEMON_URL/escape.git"
'
test_expect_success 'daemon log records all attributes' '
cat >expect <<-\EOF &&
Extended attribute "host": localhost
Extended attribute "protocol": version=1
EOF
>daemon.log &&
GIT_OVERRIDE_VIRTUAL_HOST=localhost \
git -c protocol.version=1 \
ls-remote "$GIT_DAEMON_URL/interp.git" &&
grep -i extended.attribute daemon.log | cut -d" " -f2- >actual &&
test_cmp expect actual
'
test_expect_success FAKENC 'hostname interpolation works after LF-stripping' '
{
printf "git-upload-pack /interp.git\n\0host=localhost" | packetize
printf "0000"
} >input &&
fake_nc "$GIT_DAEMON_HOST_PORT" <input >output &&
depacketize <output >output.raw &&
# just pick out the value of master, which avoids any protocol
# particulars
perl -lne "print \$1 if m{^(\\S+) refs/heads/master}" <output.raw >actual &&
git -C "$repo" rev-parse master >expect &&
test_cmp expect actual
'
stop_git_daemon
test_done