add curl fuzzer (#18)

curl/Dockerfile

@@ -0,0 +1,23 @@
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM ossfuzz/base-libfuzzer
+MAINTAINER dvyukov@google.com
+RUN apt-get install -y make autoconf automake libtool libssl-dev zlib1g-dev
+
+COPY build.sh fuzzer.cc /src/
+
+ENV GIT_URL ""

curl/Jenkinsfile

@@ -0,0 +1,22 @@
+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+def libfuzzerBuild = fileLoader.fromGit('infra/libfuzzer-pipeline.groovy',
+                                        'https://github.com/google/oss-fuzz.git')
+
+libfuzzerBuild {
+  git = "https://github.com/curl/curl.git"
+}

curl/build.sh

@@ -0,0 +1,22 @@
+#!/bin/bash -eu
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+cd /src/curl
+./buildconf
+./configure --disable-shared --enable-debug --enable-maintainer-mode --disable-symbol-hiding --disable-threaded-resolver --enable-ipv6 --with-random=/dev/null
+make -j4
+$CXX $CXXFLAGS /src/fuzzer.cc -Iinclude lib/.libs/libcurl.a -lssl -lcrypto -lz /work/libfuzzer/*.o -o /out/curl_fuzzer $LDFLAGS

curl/fuzzer.cc

@@ -0,0 +1,117 @@
+/*
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+*/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <curl/curl.h>
+
+static const void *cur_data;
+static int cur_size = -1;
+static int server_fd = -1;
+static int client_fd = -1;
+static bool wrote = false;
+
+static void fail(const char *why) {
+  perror(why);
+  exit(1);
+}
+
+static curl_socket_t open_sock(void *ctx, curlsocktype purpose,
+                               struct curl_sockaddr *address) {
+  if (cur_size == -1) fail("not fuzzing");
+  if (server_fd != -1 || client_fd != -1) fail("already connected");
+  int fds[2];
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds)) fail("socketpair");
+  server_fd = fds[0];
+  client_fd = fds[1];
+  if (write(server_fd, cur_data, cur_size) != cur_size) fail("write");
+  if (shutdown(server_fd, SHUT_WR)) fail("shutdown");
+  return client_fd;
+}
+
+static int set_opt(void *ctx, curl_socket_t curlfd, curlsocktype purpose) {
+  return CURL_SOCKOPT_ALREADY_CONNECTED;
+}
+
+static size_t write_callback(char *ptr, size_t size, size_t n, void *ctx) {
+  return size * n;
+}
+
+static size_t read_callback(char *buf, size_t size, size_t n, void *ctx) {
+  if (wrote || size * n == 0) return 0;
+  wrote = true;
+  buf[0] = 'a';
+  return 1;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  cur_data = Data;
+  cur_size = Size;
+  wrote = false;
+  CURL *curl = curl_easy_init();
+  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
+  curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
+  curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, open_sock);
+  curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, set_opt);
+#if defined(FUZZER_FTP)
+  curl_easy_setopt(curl, CURLOPT_URL, "ftp://user@localhost/file.txt");
+#elif defined(FUZZER_IMAP)
+  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+  curl_easy_setopt(curl, CURLOPT_URL, "imap://localhost");
+#elif defined(FUZZER_POP3)
+  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+  curl_easy_setopt(curl, CURLOPT_URL, "pop3://localhost");
+#elif defined(FUZZER_HTTP_UPLOAD)
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
+  curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+#elif defined(FUZZER_HTTP2)
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
+  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYSTATUS, 0L);
+#else
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
+#endif
+  curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+  close(server_fd);
+  close(client_fd);
+  server_fd = -1;
+  client_fd = -1;
+  cur_data = NULL;
+  cur_size = -1;
+  return 0;
+}

curl/http.dict

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+"\x0a\x0d"
+"HTTP/1.0"
+"HTTP/1.1"
+"100"
+"200"
+"301"
+"400"
+"Server:"
+"Last-Modified:"
+"Content-Type:"
+"text/html"
+"charset=UTF-8"
+"Accept-Ranges:"
+"bytes"
+"Content-Length:"
+"Transfer-Encoding:"
+"compress"
+"exi"
+"gzip"
+"identity"
+"pack200-gzip"
+"br"
+"deflate"
+"bzip2"
+"lzma"
+"xz"
+"Content-Encoding:"
+"chunked"
+"Connection:"
+"close"
+"Date:"
+"Expires:"
+"Fri, 31 Dec 1999 23:59:59 GMT"
+"Cache-Control:"
+"no-cache"
+"no-store"
+"must-revalidate"
+"Pragma:"
+"no-cache"
+"Host:"
+

curl/http.options

@@ -0,0 +1,3 @@
+[libfuzzer]
+max_len = 1000
+dict = http.dict