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| -rw-r--r-- | .gitignore | 46 | ||||
| -rw-r--r-- | LICENSE | 202 | ||||
| -rw-r--r-- | Makefile.am | 55 | ||||
| -rw-r--r-- | configure.ac | 46 | ||||
| -rw-r--r-- | m4/ax_cxx_compile_stdcxx_11.m4 | 142 | ||||
| -rw-r--r-- | src/lib.urp | 5 | ||||
| -rw-r--r-- | src/random.cc | 91 | ||||
| -rw-r--r-- | src/random.h | 32 | ||||
| -rw-r--r-- | src/random.urs | 21 |
9 files changed, 640 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ac66a6c --- /dev/null +++ b/.gitignore @@ -0,0 +1,46 @@ +# -*- conf -*- + +# Editor backup files +*~ +\#* +.\#* + +# aclocal +aclocal.m4 +autom4te.cache/ + +# libtoolize +ltmain.sh +m4/libtool.m4 +m4/ltoptions.m4 +m4/ltsugar.m4 +m4/ltversion.m4 +m4/lt~obsolete.m4 + +# autoconf +configure + +# automake +Makefile.in +compile +config.guess +config.sub +depcomp +install-sh +missing + +# configure +.deps/ +Makefile +config.log +config.status +config.urp +libtool + +# make +.dirstamp +*.la +*.lo +*.o + +.libs/ @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..26bb36b --- /dev/null +++ b/Makefile.am @@ -0,0 +1,55 @@ +# Copyright 2015 the Massachusetts Institute of Technology +# +# 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. + +ACLOCAL_AMFLAGS = -I m4 + +CPPFLAGS = \ + -Wall \ + -D_FORTIFY_SOURCE=2 \ + @OpenSSL_CFLAGS@ + +CXXFLAGS = \ + -std=c++11 \ + -ftrapv \ + -fstack-protector-strong --param=ssp-buffer-size=4 \ + -fPIE \ + -O2 \ + @OpenSSL_CFLAGS@ + +CXXFLAGS += \ + -Weverything \ + -Wno-c++98-compat + +LDFLAGS = \ + -Wl,-Bsymbolic-functions \ + -Wl,-z,relro \ + -pie + +lib_LTLIBRARIES = liburweb_crypto_random_openssl.la + +liburweb_crypto_random_openssl_la_SOURCES = src/random.cc +liburweb_crypto_random_openssl_la_DATA = \ + src/lib.urp \ + src/random.h \ + src/random.urs + +liburweb_crypto_random_openssl_la_LIBADD = @OpenSSL_LIBS@ -lurweb +liburweb_crypto_random_openssl_la_LDFLAGS = \ + -export-symbols-regex '^uw_Random_' + +liburweb_crypto_random_openssl_ladir = $(datadir)/urweb/ur/crypto-random-openssl + +EXTRA_DIST = \ + LICENSE \ + $(liburweb_crypto_random_openssl_la_DATA) diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..38a9f52 --- /dev/null +++ b/configure.ac @@ -0,0 +1,46 @@ +# Copyright 2015 the Massachusetts Institute of Technology +# +# Licensed under the Apache License, Version 2.0 (the "License"); you may not +# use this file except in compliance with the License. You may obtain a copy of +# the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +# License for the specific language governing permissions and limitations under +# the License. + +AC_INIT([urweb-crypto-random-openssl], [1.0.0], [bbaren@mit.edu]) +AM_INIT_AUTOMAKE([no-dist-gzip dist-xz foreign subdir-objects]) +LT_INIT + +AC_CONFIG_MACRO_DIR([m4]) + +AC_PROG_CXX([clang++]) +AX_CXX_COMPILE_STDCXX_11([noext], [mandatory]) + +AC_CHECK_HEADERS([openssl/rand.h], + [], + [AC_MSG_FAILURE([OpenSSL headers are required])]) +PKG_CHECK_MODULES([OpenSSL], [openssl]) + +AC_CHECK_HEADERS([urweb/urweb_cpp.h], + [], + [AC_MSG_FAILURE([Ur/Web headers are required])]) +save_LIBS=$LIBS +LIBS="$LIBS -lurweb" +AC_LINK_IFELSE([AC_LANG_CALL( + [int uw_init_client_data; + int uw_copy_client_data; + int uw_global_custom; + int uw_do_expunge; + int uw_post_expunge; + int uw_free_client_data;], + [uw_error])], + [], + [AC_MSG_FAILURE([could not link with -lurweb])]) +LIBS=$save_LIBS + +AC_OUTPUT([Makefile]) diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4 new file mode 100644 index 0000000..163a4c6 --- /dev/null +++ b/m4/ax_cxx_compile_stdcxx_11.m4 @@ -0,0 +1,142 @@ +# ============================================================================ +# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html +# ============================================================================ +# +# SYNOPSIS +# +# AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional]) +# +# DESCRIPTION +# +# Check for baseline language coverage in the compiler for the C++11 +# standard; if necessary, add switches to CXXFLAGS to enable support. +# +# The first argument, if specified, indicates whether you insist on an +# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. +# -std=c++11). If neither is specified, you get whatever works, with +# preference for an extended mode. +# +# The second argument, if specified 'mandatory' or if left unspecified, +# indicates that baseline C++11 support is required and that the macro +# should error out if no mode with that support is found. If specified +# 'optional', then configuration proceeds regardless, after defining +# HAVE_CXX11 if and only if a supporting mode is found. +# +# LICENSE +# +# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com> +# Copyright (c) 2012 Zack Weinberg <zackw@panix.com> +# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> +# Copyright (c) 2014 Alexey Sokolov <sokolov@google.com> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. This file is offered as-is, without any +# warranty. + +#serial 4 + +m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[ + template <typename T> + struct check + { + static_assert(sizeof(int) <= sizeof(T), "not big enough"); + }; + + struct Base { + virtual void f() {} + }; + struct Child : public Base { + virtual void f() override {} + }; + + typedef check<check<bool>> right_angle_brackets; + + int a; + decltype(a) b; + + typedef check<int> check_type; + check_type c; + check_type&& cr = static_cast<check_type&&>(c); + + auto d = a; + auto l = [](){}; +]]) + +AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl + m4_if([$1], [], [], + [$1], [ext], [], + [$1], [noext], [], + [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl + m4_if([$2], [], [ax_cxx_compile_cxx11_required=true], + [$2], [mandatory], [ax_cxx_compile_cxx11_required=true], + [$2], [optional], [ax_cxx_compile_cxx11_required=false], + [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])]) + AC_LANG_PUSH([C++])dnl + ac_success=no + AC_CACHE_CHECK(whether $CXX supports C++11 features by default, + ax_cv_cxx_compile_cxx11, + [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [ax_cv_cxx_compile_cxx11=yes], + [ax_cv_cxx_compile_cxx11=no])]) + if test x$ax_cv_cxx_compile_cxx11 = xyes; then + ac_success=yes + fi + + m4_if([$1], [noext], [], [dnl + if test x$ac_success = xno; then + for switch in -std=gnu++11 -std=gnu++0x; do + cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch]) + AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch, + $cachevar, + [ac_save_CXXFLAGS="$CXXFLAGS" + CXXFLAGS="$CXXFLAGS $switch" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [eval $cachevar=yes], + [eval $cachevar=no]) + CXXFLAGS="$ac_save_CXXFLAGS"]) + if eval test x\$$cachevar = xyes; then + CXXFLAGS="$CXXFLAGS $switch" + ac_success=yes + break + fi + done + fi]) + + m4_if([$1], [ext], [], [dnl + if test x$ac_success = xno; then + for switch in -std=c++11 -std=c++0x; do + cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch]) + AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch, + $cachevar, + [ac_save_CXXFLAGS="$CXXFLAGS" + CXXFLAGS="$CXXFLAGS $switch" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [eval $cachevar=yes], + [eval $cachevar=no]) + CXXFLAGS="$ac_save_CXXFLAGS"]) + if eval test x\$$cachevar = xyes; then + CXXFLAGS="$CXXFLAGS $switch" + ac_success=yes + break + fi + done + fi]) + AC_LANG_POP([C++]) + if test x$ax_cxx_compile_cxx11_required = xtrue; then + if test x$ac_success = xno; then + AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.]) + fi + else + if test x$ac_success = xno; then + HAVE_CXX11=0 + AC_MSG_NOTICE([No compiler with C++11 support was found]) + else + HAVE_CXX11=1 + AC_DEFINE(HAVE_CXX11,1, + [define if the compiler supports basic C++11 syntax]) + fi + + AC_SUBST(HAVE_CXX11) + fi +]) diff --git a/src/lib.urp b/src/lib.urp new file mode 100644 index 0000000..62b02ba --- /dev/null +++ b/src/lib.urp @@ -0,0 +1,5 @@ +ffi random +benignEffectful Random.bytes +benignEffectful Random.int +include random.h +link -lurweb_crypto_random_openssl -lcrypto diff --git a/src/random.cc b/src/random.cc new file mode 100644 index 0000000..12deaf0 --- /dev/null +++ b/src/random.cc @@ -0,0 +1,91 @@ +// Copyright (C) 2015 the Massachusetts Institute of Technology +// +// 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 "random.h" + +#include <cstddef> +#include <limits> + +#include <openssl/rand.h> +extern "C" { +#include <urweb/urweb_cpp.h> +} + +static_assert(sizeof(char) == 1, "char is not a single byte"); +static_assert(sizeof(unsigned char) == 1, "unsigned char is not a single byte"); + +namespace { + +// Asserts a condition without crashing or releasing information about where the +// error occurred. This function is essential for web programming, where an +// attacker should not be able to bring down the app by causing an assertion +// failure. +void Assert(uw_context* const context, const bool condition, + const failure_kind action, const char* const message) { + if (!condition) { + uw_error(context, action, message); + } +} + +void Assert(uw_context* const context, + const bool condition, const char* const message) { + Assert(context, condition, FATAL, message); +} + +char* RandomBytes(struct uw_context* const context, const int n_bytes) { + Assert(context, 0 <= n_bytes, + "cannot produce a negative number of random bytes"); + // Allocate for the result. Ensure that no precision gets lost when casting + // from int to std::size_t. + static_assert(std::numeric_limits<int>::max() + <= std::numeric_limits<std::size_t>::max(), + "int is larger than expected"); + unsigned char* const result_bytes = + static_cast<unsigned char*>(uw_malloc(context, + static_cast<std::size_t>(n_bytes))); + // Fill it with random data. + Assert(context, RAND_bytes(result_bytes, n_bytes) == 1, BOUNDED_RETRY, + "cannot generate random data"); + return reinterpret_cast<char*>(result_bytes); +} + +} // namespace + +uw_Basis_int uw_Random_int(struct uw_context* const context) { + return *reinterpret_cast<uw_Basis_int*>(RandomBytes(context, + sizeof(uw_Basis_int))); +} + +uw_Basis_blob uw_Random_bytes(struct uw_context* const context, + const uw_Basis_int ur_n_bytes) { + // We need to use ur_n_bytes as a number of different types in this function. + // The smallest one, however, is almost certainly int. Ensure that that's the + // case. + static_assert(std::numeric_limits<int>::max() + <= std::numeric_limits<std::size_t>::max(), + "int is larger than expected"); + static_assert(std::numeric_limits<int>::max() + <= std::numeric_limits<uw_Basis_int>::max(), + "int is larger than expected"); + // Ensure that we don't lose precision when converting ur_n_bytes to int, and + // do so. + Assert(context, 0 <= ur_n_bytes, + "cannot produce a negative number of random bytes"); + Assert(context, ur_n_bytes < std::numeric_limits<int>::max(), + "requested number of bytes is larger than supported"); + const int n_bytes = static_cast<int>(ur_n_bytes); + // Generate random data. + return uw_Basis_blob{static_cast<std::size_t>(n_bytes), + RandomBytes(context, n_bytes)}; +} diff --git a/src/random.h b/src/random.h new file mode 100644 index 0000000..4d05ac3 --- /dev/null +++ b/src/random.h @@ -0,0 +1,32 @@ +// Copyright (C) 2015 the Massachusetts Institute of Technology +// +// 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. + +#ifndef URWEB_CRYPTO_RANDOM_OPENSSL_RANDOM_H +#define URWEB_CRYPTO_RANDOM_OPENSSL_RANDOM_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include <urweb/urweb_cpp.h> + +uw_Basis_int uw_Random_int(struct uw_context*); + +uw_Basis_blob uw_Random_bytes(struct uw_context*, const uw_Basis_int); + +#ifdef __cplusplus +} +#endif + +#endif // URWEB_CRYPTO_RANDOM_OPENSSL_RANDOM_H diff --git a/src/random.urs b/src/random.urs new file mode 100644 index 0000000..284336b --- /dev/null +++ b/src/random.urs @@ -0,0 +1,21 @@ +(* Copyright 2015 the Massachusetts Institute of Technology + +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. *) + +(* Generates a random int, chosen uniformly using a cryptographically secure +entropy pool. *) +val int : transaction int + +(* Returns a blob containing the specified number of cryptographically secure +pseudorandom bytes. You must specify a nonnegative number equal or less than +INT_MAX as defined by your platform. *) +val bytes : int -> transaction blob |