1#!/bin/bash -eu 2# Copyright 2021 Google LLC 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15# 16################################################################################ 17 18BASE=${SRC}/openvpn/src/openvpn 19 20apply_sed_changes() { 21 sed -i 's/read(/fuzz_read(/g' ${BASE}/console_systemd.c 22 sed -i 's/fgets(/fuzz_fgets(/g' ${BASE}/console_builtin.c 23 sed -i 's/fgets(/fuzz_fgets(/g' ${BASE}/misc.c 24 sed -i 's/#include "forward.h"/#include "fuzz_header.h"\n#include "forward.h"/g' ${BASE}/proxy.c 25 sed -i 's/select(/fuzz_select(/g' ${BASE}/proxy.c 26 sed -i 's/send(/fuzz_send(/g' ${BASE}/proxy.c 27 sed -i 's/recv(/fuzz_recv(/g' ${BASE}/proxy.c 28 sed -i 's/isatty/fuzz_isatty/g' ${BASE}/console_builtin.c 29 30 sed -i 's/fopen/fuzz_fopen/g' ${BASE}/console_builtin.c 31 sed -i 's/fclose/fuzz_fclose/g' ${BASE}/console_builtin.c 32 33 sed -i 's/sendto/fuzz_sendto/g' ${BASE}/socket.h 34 sed -i 's/#include "misc.h"/#include "misc.h"\nextern size_t fuzz_sendto(int sockfd, void *buf, size_t len, int flags, struct sockaddr *dest_addr, socklen_t addrlen);/g' ${BASE}/socket.h 35 36 sed -i 's/fp = (flags/fp = stdout;\n\/\//g' ${BASE}/error.c 37 38 sed -i 's/crypto_msg(M_FATAL/crypto_msg(M_WARN/g' ${BASE}/crypto_openssl.c 39 sed -i 's/msg(M_FATAL, \"Cipher/return;msg(M_FATAL, \"Cipher/g' ${BASE}/crypto.c 40 sed -i 's/msg(M_FATAL/msg(M_WARN/g' ${BASE}/crypto.c 41 42 sed -i 's/= write/= fuzz_write/g' ${BASE}/packet_id.c 43} 44 45# Changes in the code so we can fuzz it. 46git apply $SRC/crypto_patch.txt 47 48echo "" >> ${BASE}/openvpn.c 49echo "#include \"fake_fuzz_header.h\"" >> ${BASE}/openvpn.c 50echo "ssize_t fuzz_get_random_data(void *buf, size_t len) { return 0; }" >> ${BASE}/fake_fuzz_header.h 51echo "int fuzz_success;" >> ${BASE}/fake_fuzz_header.h 52 53# Apply hooking changes 54apply_sed_changes 55 56# Copy corpuses out 57zip -r $OUT/fuzz_verify_cert_seed_corpus.zip $SRC/boringssl/fuzz/cert_corpus 58 59# Build openvpn 60autoreconf -ivf 61./configure --disable-lz4 --with-crypto-library=openssl OPENSSL_LIBS="-L/usr/local/ssl/ -lssl -lcrypto" OPENSSL_CFLAGS="-I/usr/local/ssl/include/" 62make 63 64# Make openvpn object files into a library we can link fuzzers to 65cd src/openvpn 66rm openvpn.o 67ar r libopenvpn.a *.o 68 69# Compile our fuzz helper 70$CXX $CXXFLAGS -g -c $SRC/fuzz_randomizer.cpp -o $SRC/fuzz_randomizer.o 71 72# Compile the fuzzers 73for fuzzname in dhcp misc base64 proxy buffer route packet_id mroute list verify_cert forward crypto; do 74 $CC -DHAVE_CONFIG_H -I. -I../.. -I../../include -I../../src/compat \ 75 -DPLUGIN_LIBDIR=\"/usr/local/lib/openvpn/plugins\" -std=c99 $CFLAGS \ 76 -c $SRC/fuzz_${fuzzname}.c -o $SRC/fuzz_${fuzzname}.o 77 78 # Link with CXX 79 $CXX ${CXXFLAGS} ${LIB_FUZZING_ENGINE} $SRC/fuzz_${fuzzname}.o -o $OUT/fuzz_${fuzzname} $SRC/fuzz_randomizer.o \ 80 libopenvpn.a ../../src/compat/.libs/libcompat.a /usr/lib/x86_64-linux-gnu/libnsl.a \ 81 /usr/lib/x86_64-linux-gnu/libresolv.a /usr/lib/x86_64-linux-gnu/liblzo2.a \ 82 -lssl -lcrypto -ldl 83done 84