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git/t/t5560-http-backend.sh
Shawn O. Pearce 34b6cb8bb0 http-backend: Protect GIT_PROJECT_ROOT from /../ requests 
Eons ago HPA taught git-daemon how to protect itself from /../
attacks, which Junio brought back into service in d79374c7b5
("daemon.c and path.enter_repo(): revamp path validation").

I did not carry this into git-http-backend as originally we relied
only upon PATH_TRANSLATED, and assumed the HTTP server had done
its access control checks to validate the resolved path was within
a directory permitting access from the remote client.  This would
usually be sufficient to protect a server from requests for its
/etc/passwd file by http://host/smart/../etc/passwd sorts of URLs.

However in 917adc0360 Mark Lodato added GIT_PROJECT_ROOT as an
additional method of configuring the CGI.  When this environment
variable is used the web server does not generate the final access
path and therefore may blindly pass through "/../etc/passwd"
in PATH_INFO under the assumption that "/../" might have special
meaning to the invoked CGI.

Instead of permitting these sorts of malformed path requests, we
now reject them back at the client, with an error message for the
server log.  This matches git-daemon behavior.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-11-09 16:37:33 -08:00

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#!/bin/sh
test_description='test git-http-backend'
. ./test-lib.sh
if test -n "$NO_CURL"; then
say 'skipping test, git built without http support'
test_done
fi
LIB_HTTPD_PORT=${LIB_HTTPD_PORT-'5560'}
. "$TEST_DIRECTORY"/lib-httpd.sh
start_httpd
find_file() {
cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
find $1 -type f |
sed -e 1q
}
config() {
git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" config $1 $2
}
GET() {
curl --include "$HTTPD_URL/smart/repo.git/$1" >out 2>/dev/null &&
tr '\015' Q <out |
sed '
s/Q$//
1q
' >act &&
echo "HTTP/1.1 $2" >exp &&
test_cmp exp act
}
POST() {
curl --include --data "$2" \
--header "Content-Type: application/x-$1-request" \
"$HTTPD_URL/smart/repo.git/$1" >out 2>/dev/null &&
tr '\015' Q <out |
sed '
s/Q$//
1q
' >act &&
echo "HTTP/1.1 $3" >exp &&
test_cmp exp act
}
log_div() {
echo >>"$HTTPD_ROOT_PATH"/access.log
echo "### $1" >>"$HTTPD_ROOT_PATH"/access.log
echo "###" >>"$HTTPD_ROOT_PATH"/access.log
}
test_expect_success 'setup repository' '
echo content >file &&
git add file &&
git commit -m one &&
mkdir "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
(cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
git --bare init &&
: >objects/info/alternates &&
: >objects/info/http-alternates
) &&
git remote add public "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
git push public master:master &&
(cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
git repack -a -d
) &&
echo other >file &&
git add file &&
git commit -m two &&
git push public master:master &&
LOOSE_URL=$(find_file objects/??) &&
PACK_URL=$(find_file objects/pack/*.pack) &&
IDX_URL=$(find_file objects/pack/*.idx)
'
get_static_files() {
GET HEAD "$1" &&
GET info/refs "$1" &&
GET objects/info/packs "$1" &&
GET objects/info/alternates "$1" &&
GET objects/info/http-alternates "$1" &&
GET $LOOSE_URL "$1" &&
GET $PACK_URL "$1" &&
GET $IDX_URL "$1"
}
test_expect_success 'direct refs/heads/master not found' '
log_div "refs/heads/master"
GET refs/heads/master "404 Not Found"
'
test_expect_success 'static file is ok' '
log_div "getanyfile default"
get_static_files "200 OK"
'
test_expect_success 'static file if http.getanyfile true is ok' '
log_div "getanyfile true"
config http.getanyfile true &&
get_static_files "200 OK"
'
test_expect_success 'static file if http.getanyfile false fails' '
log_div "getanyfile false"
config http.getanyfile false &&
get_static_files "403 Forbidden"
'
test_expect_success 'http.uploadpack default enabled' '
log_div "uploadpack default"
GET info/refs?service=git-upload-pack "200 OK" &&
POST git-upload-pack 0000 "200 OK"
'
test_expect_success 'http.uploadpack true' '
log_div "uploadpack true"
config http.uploadpack true &&
GET info/refs?service=git-upload-pack "200 OK" &&
POST git-upload-pack 0000 "200 OK"
'
test_expect_success 'http.uploadpack false' '
log_div "uploadpack false"
config http.uploadpack false &&
GET info/refs?service=git-upload-pack "403 Forbidden" &&
POST git-upload-pack 0000 "403 Forbidden"
'
test_expect_success 'http.receivepack default disabled' '
log_div "receivepack default"
GET info/refs?service=git-receive-pack "403 Forbidden" &&
POST git-receive-pack 0000 "403 Forbidden"
'
test_expect_success 'http.receivepack true' '
log_div "receivepack true"
config http.receivepack true &&
GET info/refs?service=git-receive-pack "200 OK" &&
POST git-receive-pack 0000 "200 OK"
'
test_expect_success 'http.receivepack false' '
log_div "receivepack false"
config http.receivepack false &&
GET info/refs?service=git-receive-pack "403 Forbidden" &&
POST git-receive-pack 0000 "403 Forbidden"
'
run_backend() {
REQUEST_METHOD=GET \
GIT_PROJECT_ROOT="$HTTPD_DOCUMENT_ROOT_PATH" \
PATH_INFO="$2" \
git http-backend >act.out 2>act.err
}
path_info() {
if test $1 = 0; then
run_backend "$2"
else
test_must_fail run_backend "$2" &&
echo "fatal: '$2': aliased" >exp.err &&
test_cmp exp.err act.err
fi
}
test_expect_success 'http-backend blocks bad PATH_INFO' '
config http.getanyfile true &&
run_backend 0 /repo.git/HEAD &&
run_backend 1 /repo.git/../HEAD &&
run_backend 1 /../etc/passwd &&
run_backend 1 ../etc/passwd &&
run_backend 1 /etc//passwd &&
run_backend 1 /etc/./passwd &&
run_backend 1 /etc/.../passwd &&
run_backend 1 //domain/data.txt
'
cat >exp <<EOF
### refs/heads/master
###
GET /smart/repo.git/refs/heads/master HTTP/1.1 404 -
### getanyfile default
###
GET /smart/repo.git/HEAD HTTP/1.1 200
GET /smart/repo.git/info/refs HTTP/1.1 200
GET /smart/repo.git/objects/info/packs HTTP/1.1 200
GET /smart/repo.git/objects/info/alternates HTTP/1.1 200 -
GET /smart/repo.git/objects/info/http-alternates HTTP/1.1 200 -
GET /smart/repo.git/$LOOSE_URL HTTP/1.1 200
GET /smart/repo.git/$PACK_URL HTTP/1.1 200
GET /smart/repo.git/$IDX_URL HTTP/1.1 200
### getanyfile true
###
GET /smart/repo.git/HEAD HTTP/1.1 200
GET /smart/repo.git/info/refs HTTP/1.1 200
GET /smart/repo.git/objects/info/packs HTTP/1.1 200
GET /smart/repo.git/objects/info/alternates HTTP/1.1 200 -
GET /smart/repo.git/objects/info/http-alternates HTTP/1.1 200 -
GET /smart/repo.git/$LOOSE_URL HTTP/1.1 200
GET /smart/repo.git/$PACK_URL HTTP/1.1 200
GET /smart/repo.git/$IDX_URL HTTP/1.1 200
### getanyfile false
###
GET /smart/repo.git/HEAD HTTP/1.1 403 -
GET /smart/repo.git/info/refs HTTP/1.1 403 -
GET /smart/repo.git/objects/info/packs HTTP/1.1 403 -
GET /smart/repo.git/objects/info/alternates HTTP/1.1 403 -
GET /smart/repo.git/objects/info/http-alternates HTTP/1.1 403 -
GET /smart/repo.git/$LOOSE_URL HTTP/1.1 403 -
GET /smart/repo.git/$PACK_URL HTTP/1.1 403 -
GET /smart/repo.git/$IDX_URL HTTP/1.1 403 -
### uploadpack default
###
GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
POST /smart/repo.git/git-upload-pack HTTP/1.1 200 -
### uploadpack true
###
GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
POST /smart/repo.git/git-upload-pack HTTP/1.1 200 -
### uploadpack false
###
GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 403 -
POST /smart/repo.git/git-upload-pack HTTP/1.1 403 -
### receivepack default
###
GET /smart/repo.git/info/refs?service=git-receive-pack HTTP/1.1 403 -
POST /smart/repo.git/git-receive-pack HTTP/1.1 403 -
### receivepack true
###
GET /smart/repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
POST /smart/repo.git/git-receive-pack HTTP/1.1 200 -
### receivepack false
###
GET /smart/repo.git/info/refs?service=git-receive-pack HTTP/1.1 403 -
POST /smart/repo.git/git-receive-pack HTTP/1.1 403 -
EOF
test_expect_success 'server request log matches test results' '
sed -e "
s/^.* \"//
s/\"//
s/ [1-9][0-9]*\$//
s/^GET /GET /
" >act <"$HTTPD_ROOT_PATH"/access.log &&
test_cmp exp act
'
stop_httpd
test_done
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