======================================================================== * crt/aws-c-common/README.md ======================================================================== ## AWS C Common [![GitHub](https://img.shields.io/github/license/awslabs/aws-c-common.svg)](https://github.com/awslabs/aws-c-common/blob/main/LICENSE) Core c99 package for AWS SDK for C. Includes cross-platform primitives, configuration, data structures, and error handling. ## License This library is licensed under the Apache 2.0 License. ## Usage ### Building aws-c-common uses CMake for setting up build environments. This library has no non-kernel dependencies so the build is quite simple. For example: git clone git@github.com:awslabs/aws-c-common.git aws-c-common mkdir aws-c-common-build cd aws-c-common-build cmake ../aws-c-common make -j 12 make test sudo make install Keep in mind that CMake supports multiple build systems, so for each platform you can pass your own build system as the `-G` option. For example: cmake -GNinja ../aws-c-common ninja build ninja test sudo ninja install Or on windows, cmake -G "Visual Studio 14 2015 Win64" ../aws-c-common msbuild.exe ALL_BUILD.vcproj ### CMake Options * -DCMAKE_CLANG_TIDY=/path/to/clang-tidy (or just clang-tidy or clang-tidy-7.0 if it is in your PATH) - Runs clang-tidy as part of your build. * -DENABLE_SANITIZERS=ON - Enables gcc/clang sanitizers, by default this adds -fsanitizer=address,undefined to the compile flags for projects that call aws_add_sanitizers. * -DENABLE_FUZZ_TESTS=ON - Includes fuzz tests in the unit test suite. Off by default, because fuzz tests can take a long time. Set -DFUZZ_TESTS_MAX_TIME=N to determine how long to run each fuzz test (default 60s). * -DCMAKE_INSTALL_PREFIX=/path/to/install - Standard way of installing to a user defined path. If specified when configuring aws-c-common, ensure the same prefix is specified when configuring other aws-c-* SDKs. * -DAWS_STATIC_MSVC_RUNTIME_LIBRARY=ON - Windows-only. Turn ON to use the statically-linked MSVC runtime lib, instead of the DLL. ### API style and conventions Every API has a specific set of styles and conventions. We'll outline them here. These conventions are followed in every library in the AWS C SDK ecosystem. #### Error handling Every function that returns an `int` type, returns `AWS_OP_SUCCESS` ( 0 ) or `AWS_OP_ERR` (-1) on failure. To retrieve the error code, use the function `aws_last_error()`. Each error code also has a corresponding error string that can be accessed via the `aws_error_str()` function. In addition, you can install both a global and a thread local error handler by using the `aws_set_global_error_handler_fn()` and `aws_set_thread_local_error_handler_fn()` functions. All error functions are in the `include/aws/common/error.h` header file. #### Naming Any function that allocates and initializes an object will be suffixed with `new` (e.g. `aws_myobj_new()`). Similarly, these objects will always have a corresponding function with a `destroy` suffix. The `new` functions will return the allocated object on success and `NULL` on failure. To respond to the error, call `aws_last_error()`. If several `new` or `destroy` functions are available, the variants should be named like `new_x` or `destroy_x` (e.g. `aws_myobj_new_copy()` or `aws_myobj_destroy_secure()`). Any function that initializes an existing object will be suffixed with `init` (e.g. `aws_myobj_init()`. These objects will have a corresponding `clean_up` function if necessary. In these cases, you are responsible for making the decisions for how your object is allocated. The `init` functions return `AWS_OP_SUCCESS` ( 0 ) or `AWS_OP_ERR` (-1) on failure. If several `init` or `clean_up` functions are available, they should be named like `init_x` or `clean_up_x` (e.g. `aws_myobj_init_static()` or `aws_myobj_clean_up_secure()`). ## Contributing If you are contributing to this code-base, first off, THANK YOU!. There are a few things to keep in mind to minimize the pull request turn around time. ### Coding "guidelines" These "guidelines" are followed in every library in the AWS C SDK ecosystem. #### Memory Management * All APIs that need to be able to allocate memory, must take an instance of `aws_allocator` and use that. No `malloc()` or `free()` calls should be made directly. * If an API does not allocate the memory, it does not free it. All allocations and deallocations should take place at the same level. For example, if a user allocates memory, the user is responsible for freeing it. There will inevitably be a few exceptions to this rule, but they will need significant justification to make it through the code-review. * All functions that allocate memory must raise an `AWS_ERROR_OOM` error code upon allocation failures. If it is a `new()` function it should return NULL. If it is an `init()` function, it should return `AWS_OP_ERR`. #### Threading * Occasionally a thread is necessary. In those cases, prefer for memory not to be shared between threads. If memory must cross a thread barrier it should be a complete ownership hand-off. Bias towards, "if I need a mutex, I'm doing it wrong". * Do not sleep or block .... ever .... under any circumstances, in non-test-code. * Do not expose blocking APIs. ### Error Handling * For APIs returning an `int` error code. The only acceptable return types are `AWS_OP_SUCCESS` and `AWS_OP_ERR`. Before returning control to the caller, if you have an error to raise, use the `aws_raise_error()` function. * For APIs returning an allocated instance of an object, return the memory on success, and `NULL` on failure. Before returning control to the caller, if you have an error to raise, use the `aws_raise_error()` function. #### Log Subjects & Error Codes The logging & error handling infrastructure is designed to support multiple libraries. For this to work, AWS maintained libraries have pre-slotted log subjects & error codes for each library. The currently allocated ranges are: | Range | Library Name | | --- | --- | | [0x0000, 0x0400) | aws-c-common | | [0x0400, 0x0800) | aws-c-io | | [0x0800, 0x0C00) | aws-c-http | | [0x0C00, 0x1000) | aws-c-compression | | [0x1000, 0x1400) | aws-c-eventstream | | [0x1400, 0x1800) | aws-c-mqtt | | [0x1800, 0x1C00) | aws-c-auth | | [0x1C00, 0x2000) | aws-c-cal | | [0x2000, 0x2400) | aws-crt-cpp | | [0x2400, 0x2800) | aws-crt-java | | [0x2800, 0x2C00) | aws-crt-python | | [0x2C00, 0x3000) | aws-crt-nodejs | | [0x3000, 0x3400) | aws-crt-dotnet | | [0x3400, 0x3800) | aws-c-iot | | [0x3800, 0x3C00) | aws-c-s3 | | [0x3C00, 0x4000) | aws-c-sdkutils | | [0x4000, 0x4400) | (reserved for future project) | | [0x4400, 0x4800) | (reserved for future project) | Each library should begin its error and log subject values at the beginning of its range and follow in sequence (don't skip codes). Upon adding an AWS maintained library, a new enum range must be approved and added to the above table. ### Testing We have a high bar for test coverage, and PRs fixing bugs or introducing new functionality need to have tests before they will be accepted. A couple of tips: #### Aws Test Harness We provide a test harness for writing unit tests. This includes an allocator that will fail your test if you have any memory leaks, as well as some `ASSERT` macros. To write a test: * Create a *.c test file in the tests directory of the project. * Implement one or more tests with the signature `int test_case_name(struct aws_allocator *, void *ctx)` * Use the `AWS_TEST_CASE` macro to declare the test. * Include your test in the `tests/main.c` file. * Include your test in the `tests/CMakeLists.txt` file. ### Coding Style * No Tabs. * Indent is 4 spaces. * K & R style for braces. * Space after if, before the `(`. * `else` and `else if` stay on the same line as the closing brace. Example: if (condition) { do_something(); } else { do_something_else(); } * Avoid C99 features in header files. For some types such as bool, uint32_t etc..., these are defined if not available for the language standard being used in `aws/common/common.h`, so feel free to use them. * For C++ compatibility, don't put const members in structs. * Avoid C++ style comments e.g. `//` in header files and prefer block style (`/* */`) for long blocks of text. C++ style comments are fine in C files. * All public API functions need C++ guards and Windows dll semantics. * Use Unix line endings. * Where implementation hiding is desired for either ABI or runtime polymorphism reasons, use the `void *impl` pattern. v-tables should be the last member in the struct. * For #ifdef, put a # as the first character on the line and then indent the compilation branches. Example: #ifdef FOO do_something(); # ifdef BAR do_something_else(); # endif #endif * For all error code names with the exception of aws-c-common, use `AWS_ERROR__`. * All error strings should be written using correct English grammar. * SNAKE_UPPER_CASE constants, macros, and enum members. * snake_lower_case everything else. * `static` (local file scope) variables that are not `const` are prefixed by `s_` and lower snake case. * Global variables not prefixed as `const` are prefixed by `g_` and lower snake case. * Thread local variables are prefixed as `tl_` and lower snake case. * Macros and `const` variables are upper snake case. * For constants, prefer anonymous enums. * Don't typedef structs. It breaks forward declaration ability. * Don't typedef enums. It breaks forward declaration ability. * typedef function definitions for use as function pointers as values and suffixed with _fn. Do this: typedef int(fn_name_fn)(void *); Not this: typedef int(*fn_name_fn)(void *); * If a callback may be async, then always have it be async. Callbacks that are sometimes async and sometimes sync are hard to code around and lead to bugs (see [this blog post](https://blog.ometer.com/2011/07/24/callbacks-synchronous-and-asynchronous/)). Unfortunately many callbacks in this codebase currently violate this rule, so be careful. But do not add any more. * Every source and header file must have a copyright header (The standard AWS one for apache 2). * Use standard include guards (e.g. #IFNDEF HEADER_NAME #define HEADER_NAME etc...). * Include order should be: the header for the translation unit for the .c file newline header files in a directory in alphabetical order newline header files not in a directory (system and stdlib headers) * Platform specifics should be handled in c files and partitioned by directory. * Do not use `extern inline`. It's too unpredictable between compiler versions and language standards. * Namespace all definitions in header files with `aws_?__`. Lib name is not always required if a conflict is not likely and it provides better ergonomics. * `init`, `clean_up`, `new`, `destroy` are suffixed to the function names for their object. Example: AWS_COMMON_API int aws_module_init(aws_module_t *module); AWS_COMMON_API void aws_module_clean_up(aws_module_t *module); AWS_COMMON_API aws_module_t *aws_module_new(aws_allocator_t *allocator); AWS_COMMON_API void aws_module_destroy(aws_module_t *module); * Avoid c-strings, and don't write code that depends on `NULL` terminators. Expose `struct aws_byte_buf` APIs and let the user figure it out. * There is only one valid character encoding-- UTF-8. Try not to ever need to care about character encodings, but where you do, the working assumption should always be UTF-8 unless it's something we don't get a choice in (e.g. a protocol explicitly mandates a character set). * If you are adding/using a compiler specific keyword, macro, or intrinsic, hide it behind a platform independent macro definition. This mainly applies to header files. Obviously, if you are writing a file that will only be built on a certain platform, you have more liberty on this. * When checking more than one error condition, check and log each condition separately with a unique message. Do this: if (options->callback == NULL) { AWS_LOGF_ERROR(AWS_LS_SOME_SUBJECT, "Invalid options - callback is null"); return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT); } if (options->allocator == NULL) { AWS_LOGF_ERROR(AWS_LS_SOME_SUBJECT, "Invalid options - allocator is null"); return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT); } Not this: if (options->callback == NULL || options->allocator == NULL) { AWS_LOGF_ERROR(AWS_LS_SOME_SUBJECT, "Invalid options - something is null"); return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT); } ## CBMC To learn more about CBMC and proofs specifically, review the training material [here](https://model-checking.github.io/cbmc-training). The `verification/cbmc/proofs` directory contains CBMC proofs. In order to run these proofs you will need to install CBMC and other tools by following the instructions [here](https://model-checking.github.io/cbmc-training/installation.html). ======================================================================== * LICENSE, crt/aws-c-auth/LICENSE, crt/aws-c-common/LICENSE, crt/aws-c-compression/LICENSE, crt/aws-c-event-stream/LICENSE, crt/aws-c-http/LICENSE, crt/aws-c-io/LICENSE, crt/aws-c-mqtt/LICENSE, crt/s2n/LICENSE ======================================================================== Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. 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New files from AWS-LC are made available under the Apache-2.0 license OR the ISC license. These licenses are reproduced at the bottom of this file. BoringSSL licensing ------------------- BoringSSL is a fork of OpenSSL. As such, large parts of it fall under OpenSSL licensing. Files that are completely new have a Google copyright and an ISC license. This license is reproduced at the bottom of this file. Files in third_party/ have their own licenses, as described therein. The MIT license, for third_party/fiat, which, unlike other third_party directories, is compiled into non-test libraries, is included below. The OpenSSL toolkit stays under a dual license, i.e. both the conditions of the OpenSSL License and the original SSLeay license apply to the toolkit. See below for the actual license texts. Actually both licenses are BSD-style Open Source licenses. In case of any license issues related to OpenSSL please contact openssl-core@openssl.org. The following are Google-internal bug numbers where explicit permission from some authors is recorded for use of their work. (This is purely for our own record keeping.) 27287199 27287880 27287883 263291445 OpenSSL License --------------- /* ==================================================================== * Copyright (c) 1998-2011 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. 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This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ Original SSLeay License ----------------------- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. 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IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ ISC license used for completely new code in BoringSSL: /* Copyright (c) 2015, Google Inc. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. 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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. The code in third_party/jitterentropy is distributed under the 3-Clause BSD License. Amazon expressly elects to distribute the package under the 3-Clause BSD License and NOT under GNU General Public License Version 2: Copyright (C) 2017 - 2021, Stephan Mueller Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, and the entire permission notice in its entirety, including the disclaimer of warranties. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. The code in crypto/kyber/pqcrystals-kyber_kyber512_ref carries the Public Domain license: Public Domain (https://creativecommons.org/share-your-work/public-domain/cc0/) For Keccak and AES we are using public-domain code from sources and by authors listed in comments on top of the respective files. Licenses for support code ------------------------- Parts of the TLS test suite are under the Go license (BSD-3-Clause). This code is not included in BoringSSL (i.e. libcrypto and libssl) when compiled, however, so distributing code linked against BoringSSL does not trigger this license: Copyright (c) 2009 The Go Authors. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Google Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 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You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS ISC license for AWS-LC content ------------------------------------- Copyright Amazon.com, Inc. or its affiliates. Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ======================================================================== * crt/aws-lc/third_party/fiat/LICENSE ======================================================================== The MIT License (MIT) Copyright (c) 2015-2020 the fiat-crypto authors (see https://github.com/mit-plv/fiat-crypto/blob/master/AUTHORS). Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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