1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
#!/bin/sh
test_description='check handling of .. in submodule names
Exercise the name-checking function on a variety of names, and then give a
real-world setup that confirms we catch this in practice.
'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-pack.sh
test_expect_success 'check names' '
cat >expect <<-\EOF &&
valid
valid/with/paths
EOF
git submodule--helper check-name >actual <<-\EOF &&
valid
valid/with/paths
../foo
/../foo
..\foo
\..\foo
foo/..
foo/../
foo\..
foo\..\
foo/../bar
EOF
test_cmp expect actual
'
test_expect_success 'create innocent subrepo' '
git init innocent &&
git -C innocent commit --allow-empty -m foo
'
test_expect_success 'submodule add refuses invalid names' '
test_must_fail \
git submodule add --name ../../modules/evil "$PWD/innocent" evil
'
test_expect_success 'add evil submodule' '
git submodule add "$PWD/innocent" evil &&
mkdir modules &&
cp -r .git/modules/evil modules &&
write_script modules/evil/hooks/post-checkout <<-\EOF &&
echo >&2 "RUNNING POST CHECKOUT"
EOF
git config -f .gitmodules submodule.evil.update checkout &&
git config -f .gitmodules --rename-section \
submodule.evil submodule.../../modules/evil &&
git add modules &&
git commit -am evil
'
# This step seems like it shouldn't be necessary, since the payload is
# contained entirely in the evil submodule. But due to the vagaries of the
# submodule code, checking out the evil module will fail unless ".git/modules"
# exists. Adding another submodule (with a name that sorts before "evil") is an
# easy way to make sure this is the case in the victim clone.
test_expect_success 'add other submodule' '
git submodule add "$PWD/innocent" another-module &&
git add another-module &&
git commit -am another
'
test_expect_success 'clone evil superproject' '
git clone --recurse-submodules . victim >output 2>&1 &&
! grep "RUNNING POST CHECKOUT" output
'
test_expect_success 'fsck detects evil superproject' '
test_must_fail git fsck
'
test_expect_success 'transfer.fsckObjects detects evil superproject (unpack)' '
rm -rf dst.git &&
git init --bare dst.git &&
git -C dst.git config transfer.fsckObjects true &&
test_must_fail git push dst.git HEAD
'
test_expect_success 'transfer.fsckObjects detects evil superproject (index)' '
rm -rf dst.git &&
git init --bare dst.git &&
git -C dst.git config transfer.fsckObjects true &&
git -C dst.git config transfer.unpackLimit 1 &&
test_must_fail git push dst.git HEAD
'
# Normally our packs contain commits followed by trees followed by blobs. This
# reverses the order, which requires backtracking to find the context of a
# blob. We'll start with a fresh gitmodules-only tree to make it simpler.
test_expect_success 'create oddly ordered pack' '
git checkout --orphan odd &&
git rm -rf --cached . &&
git add .gitmodules &&
git commit -m odd &&
{
pack_header 3 &&
pack_obj $(git rev-parse HEAD:.gitmodules) &&
pack_obj $(git rev-parse HEAD^{tree}) &&
pack_obj $(git rev-parse HEAD)
} >odd.pack &&
pack_trailer odd.pack
'
test_expect_success 'transfer.fsckObjects handles odd pack (unpack)' '
rm -rf dst.git &&
git init --bare dst.git &&
test_must_fail git -C dst.git unpack-objects --strict <odd.pack
'
test_expect_success 'transfer.fsckObjects handles odd pack (index)' '
rm -rf dst.git &&
git init --bare dst.git &&
test_must_fail git -C dst.git index-pack --strict --stdin <odd.pack
'
test_expect_success 'index-pack --strict works for non-repo pack' '
rm -rf dst.git &&
git init --bare dst.git &&
cp odd.pack dst.git &&
test_must_fail git -C dst.git index-pack --strict odd.pack 2>output &&
# Make sure we fail due to bad gitmodules content, not because we
# could not read the blob in the first place.
grep gitmodulesName output
'
test_expect_success 'fsck detects symlinked .gitmodules file' '
git init symlink &&
(
cd symlink &&
# Make the tree directly to avoid index restrictions.
#
# Because symlinks store the target as a blob, choose
# a pathname that could be parsed as a .gitmodules file
# to trick naive non-symlink-aware checking.
tricky="[foo]bar=true" &&
content=$(git hash-object -w ../.gitmodules) &&
target=$(printf "$tricky" | git hash-object -w --stdin) &&
{
printf "100644 blob $content\t$tricky\n" &&
printf "120000 blob $target\t.gitmodules\n"
} | git mktree &&
# Check not only that we fail, but that it is due to the
# symlink detector; this grep string comes from the config
# variable name and will not be translated.
test_must_fail git fsck 2>output &&
test_i18ngrep gitmodulesSymlink output
)
'
test_expect_success 'fsck detects non-blob .gitmodules' '
git init non-blob &&
(
cd non-blob &&
# As above, make the funny tree directly to avoid index
# restrictions.
mkdir subdir &&
cp ../.gitmodules subdir/file &&
git add subdir/file &&
git commit -m ok &&
git ls-tree HEAD | sed s/subdir/.gitmodules/ | git mktree &&
test_must_fail git fsck 2>output &&
test_i18ngrep gitmodulesBlob output
)
'
test_expect_success 'fsck detects corrupt .gitmodules' '
git init corrupt &&
(
cd corrupt &&
echo "[broken" >.gitmodules &&
git add .gitmodules &&
git commit -m "broken gitmodules" &&
git fsck 2>output &&
test_i18ngrep gitmodulesParse output &&
test_i18ngrep ! "bad config" output
)
'
test_expect_success WINDOWS 'prevent git~1 squatting on Windows' '
git init squatting &&
(
cd squatting &&
mkdir a &&
touch a/..git &&
git add a/..git &&
test_tick &&
git commit -m initial &&
modules="$(test_write_lines \
"[submodule \"b.\"]" "url = ." "path = c" \
"[submodule \"b\"]" "url = ." "path = d\\\\a" |
git hash-object -w --stdin)" &&
rev="$(git rev-parse --verify HEAD)" &&
hash="$(echo x | git hash-object -w --stdin)" &&
test_must_fail git update-index --add \
--cacheinfo 160000,$rev,d\\a 2>err &&
test_i18ngrep "Invalid path" err &&
git -c core.protectNTFS=false update-index --add \
--cacheinfo 100644,$modules,.gitmodules \
--cacheinfo 160000,$rev,c \
--cacheinfo 160000,$rev,d\\a \
--cacheinfo 100644,$hash,d./a/x \
--cacheinfo 100644,$hash,d./a/..git &&
test_tick &&
git -c core.protectNTFS=false commit -m "module"
) &&
if test_have_prereq MINGW
then
test_must_fail git -c core.protectNTFS=false \
clone --recurse-submodules squatting squatting-clone 2>err &&
test_i18ngrep -e "directory not empty" -e "not an empty directory" err &&
! grep gitdir squatting-clone/d/a/git~2
fi
'
test_expect_success 'git dirs of sibling submodules must not be nested' '
git init nested &&
test_commit -C nested nested &&
(
cd nested &&
cat >.gitmodules <<-EOF &&
[submodule "hippo"]
url = .
path = thing1
[submodule "hippo/hooks"]
url = .
path = thing2
EOF
git clone . thing1 &&
git clone . thing2 &&
git add .gitmodules thing1 thing2 &&
test_tick &&
git commit -m nested
) &&
test_must_fail git clone --recurse-submodules nested clone 2>err &&
test_i18ngrep "is inside git dir" err
'
test_done
|
