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LibCrypto: Make a better ASN.1 parser
And use it to parse RSA keys. As a bonus, this one shouldn't be reading out of bounds or messing with the stack (as much) anymore.
This commit is contained in:
AnotherTest
Andreas Kling
parent
4d40864b9d
commit
3fe7ac0924
Notes:
sideshowbarker
2024-07-18 22:19:26 +09:00
Author: https://github.com/alimpfard Commit: https://github.com/SerenityOS/serenity/commit/3fe7ac0924a Pull-request: https://github.com/SerenityOS/serenity/pull/5344 Issue: https://github.com/SerenityOS/serenity/issues/5317
13 changed files with 893 additions and 624 deletions
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@ -322,6 +322,10 @@
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#cmakedefine01 RESOURCE_DEBUG
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#endif
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#ifndef RSA_PARSE_DEBUG
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#cmakedefine01 RSA_PARSE_DEBUG
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#endif
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#ifndef SAFE_SYSCALL_DEBUG
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#cmakedefine01 SAFE_SYSCALL_DEBUG
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#endif
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@ -167,6 +167,7 @@ set(DEBUG_CPP_LANGUAGE_SERVER ON)
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set(DEBUG_AUTOCOMPLETE ON)
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set(FILE_WATCHER_DEBUG ON)
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set(SYSCALL_1_DEBUG ON)
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set(RSA_PARSE_DEBUG ON)
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# False positive: DEBUG is a flag but it works differently.
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# set(DEBUG ON)
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93
Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
Normal file
93
Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
Normal file
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@ -0,0 +1,93 @@
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCrypto/ASN1/ASN1.h>
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namespace Crypto::ASN1 {
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String kind_name(Kind kind)
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{
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switch (kind) {
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case Kind::Eol:
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return "EndOfList";
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case Kind::Boolean:
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return "Boolean";
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case Kind::Integer:
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return "Integer";
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case Kind::BitString:
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return "BitString";
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case Kind::OctetString:
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return "OctetString";
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case Kind::Null:
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return "Null";
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case Kind::ObjectIdentifier:
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return "ObjectIdentifier";
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case Kind::IA5String:
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return "IA5String";
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case Kind::PrintableString:
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return "PrintableString";
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case Kind::Utf8String:
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return "UTF8String";
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case Kind::UTCTime:
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return "UTCTime";
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case Kind::Sequence:
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return "Sequence";
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case Kind::Set:
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return "Set";
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}
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return "InvalidKind";
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}
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String class_name(Class class_)
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{
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switch (class_) {
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case Class::Application:
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return "Application";
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case Class::Context:
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return "Context";
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case Class::Private:
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return "Private";
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case Class::Universal:
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return "Universal";
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}
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return "InvalidClass";
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}
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String type_name(Type type)
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{
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switch (type) {
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case Type::Constructed:
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return "Constructed";
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case Type::Primitive:
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return "Primitive";
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}
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return "InvalidType";
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}
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}
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@ -29,84 +29,45 @@
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#include <AK/Types.h>
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#include <LibCrypto/BigInt/UnsignedBigInteger.h>
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namespace Crypto {
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namespace Crypto::ASN1 {
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namespace ASN1 {
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enum class Kind {
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enum class Kind : u8 {
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Eol,
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Boolean,
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Integer,
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ShortInteger,
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BitString,
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OctetString,
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Null,
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ObjectIdentifier,
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IA5String,
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PrintableString,
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Utf8String,
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UTCTime,
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Choice,
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Sequence,
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Set,
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SetOf
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Boolean = 0x01,
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Integer = 0x02,
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BitString = 0x03,
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OctetString = 0x04,
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Null = 0x05,
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ObjectIdentifier = 0x06,
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IA5String = 0x16,
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PrintableString = 0x13,
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Utf8String = 0x0c,
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UTCTime = 0x017,
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Sequence = 0x10,
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Set = 0x11,
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// Choice = ??,
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};
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static inline StringView kind_name(Kind kind)
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{
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switch (kind) {
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case Kind::Eol:
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return "EndOfList";
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case Kind::Boolean:
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return "Boolean";
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case Kind::Integer:
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return "Integer";
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case Kind::ShortInteger:
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return "ShortInteger";
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case Kind::BitString:
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return "BitString";
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case Kind::OctetString:
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return "OctetString";
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case Kind::Null:
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return "Null";
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case Kind::ObjectIdentifier:
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return "ObjectIdentifier";
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case Kind::IA5String:
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return "IA5String";
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case Kind::PrintableString:
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return "PrintableString";
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case Kind::Utf8String:
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return "UTF8String";
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case Kind::UTCTime:
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return "UTCTime";
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case Kind::Choice:
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return "Choice";
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case Kind::Sequence:
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return "Sequence";
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case Kind::Set:
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return "Set";
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case Kind::SetOf:
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return "SetOf";
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}
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enum class Class : u8 {
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Universal = 0,
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Application = 0x40,
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Context = 0x80,
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Private = 0xc0,
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};
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return "InvalidKind";
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}
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enum class Type : u8 {
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Primitive = 0,
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Constructed = 0x20,
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};
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struct List {
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struct Tag {
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Kind kind;
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void* data;
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size_t size;
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bool used;
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List *prev, *next, *child, *parent;
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Class class_;
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Type type;
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};
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static constexpr void set(List& list, Kind type, void* data, size_t size)
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{
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list.kind = type;
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list.data = data;
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list.size = size;
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list.used = false;
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}
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}
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String kind_name(Kind);
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String class_name(Class);
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String type_name(Type);
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}
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300
Userland/Libraries/LibCrypto/ASN1/DER.cpp
Normal file
300
Userland/Libraries/LibCrypto/ASN1/DER.cpp
Normal file
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@ -0,0 +1,300 @@
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Bitmap.h>
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#include <AK/Utf8View.h>
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#include <LibCrypto/ASN1/DER.h>
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namespace Crypto::ASN1 {
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Result<Tag, DecodeError> Decoder::read_tag()
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{
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auto byte_or_error = read_byte();
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if (byte_or_error.is_error())
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return byte_or_error.error();
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auto byte = byte_or_error.value();
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u8 class_ = byte & 0xc0;
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u8 type = byte & 0x20;
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u8 kind = byte & 0x1f;
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if (kind == 0x1f) {
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kind = 0;
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while (byte & 0x80) {
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auto byte_or_error = read_byte();
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if (byte_or_error.is_error())
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return byte_or_error.error();
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byte = byte_or_error.value();
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kind = (kind << 7) | (byte & 0x7f);
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}
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}
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return Tag { (Kind)kind, (Class)class_, (Type)type };
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}
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Result<size_t, DecodeError> Decoder::read_length()
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{
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auto byte_or_error = read_byte();
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if (byte_or_error.is_error())
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return byte_or_error.error();
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auto byte = byte_or_error.value();
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size_t length = byte;
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if (byte & 0x80) {
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auto count = byte & 0x7f;
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if (count == 0x7f)
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return DecodeError::InvalidInputFormat;
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auto data_or_error = read_bytes(count);
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if (data_or_error.is_error())
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return data_or_error.error();
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auto data = data_or_error.value();
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length = 0;
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if (data.size() > sizeof(size_t))
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return DecodeError::Overflow;
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for (auto&& byte : data)
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length = (length << 8) | (size_t)byte;
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}
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return length;
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}
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Result<u8, DecodeError> Decoder::read_byte()
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{
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if (m_stack.is_empty())
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return DecodeError::NoInput;
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auto& entry = m_stack.last();
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if (entry.is_empty())
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return DecodeError::NotEnoughData;
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auto byte = entry[0];
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entry = entry.slice(1);
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return byte;
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}
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Result<ReadonlyBytes, DecodeError> Decoder::read_bytes(size_t length)
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{
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if (m_stack.is_empty())
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return DecodeError::NoInput;
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auto& entry = m_stack.last();
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if (entry.size() < length)
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return DecodeError::NotEnoughData;
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auto bytes = entry.slice(0, length);
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entry = entry.slice(length);
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return bytes;
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}
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Result<bool, DecodeError> Decoder::decode_boolean(ReadonlyBytes data)
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{
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if (data.size() != 1)
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return DecodeError::InvalidInputFormat;
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return data[0] == 0;
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}
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Result<UnsignedBigInteger, DecodeError> Decoder::decode_arbitrary_sized_integer(ReadonlyBytes data)
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{
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if (data.size() < 1)
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return DecodeError::NotEnoughData;
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if (data.size() > 1
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&& ((data[0] == 0xff && data[1] & 0x80)
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|| (data[0] == 0x00 && !(data[1] & 0x80)))) {
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return DecodeError::InvalidInputFormat;
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}
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bool is_negative = data[0] & 0x80;
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if (is_negative)
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return DecodeError::UnsupportedFormat;
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return UnsignedBigInteger::import_data(data.data(), data.size());
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}
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Result<StringView, DecodeError> Decoder::decode_octet_string(ReadonlyBytes bytes)
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{
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return StringView { bytes.data(), bytes.size() };
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}
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Result<std::nullptr_t, DecodeError> Decoder::decode_null(ReadonlyBytes data)
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{
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if (data.size() != 0)
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return DecodeError::InvalidInputFormat;
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return nullptr;
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}
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Result<Vector<int>, DecodeError> Decoder::decode_object_identifier(ReadonlyBytes data)
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{
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Vector<int> result;
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result.append(0); // Reserved space.
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u32 value = 0;
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for (auto&& byte : data) {
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if (value == 0 && byte == 0x80)
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return DecodeError::InvalidInputFormat;
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value = (value << 7) | (byte & 0x7f);
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if (!(byte & 0x80)) {
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result.append(value);
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value = 0;
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}
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}
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if (result.size() == 1 || result[1] >= 1600)
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return DecodeError::InvalidInputFormat;
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result[0] = result[1] / 40;
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result[1] = result[1] % 40;
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return result;
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}
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Result<StringView, DecodeError> Decoder::decode_printable_string(ReadonlyBytes data)
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{
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Utf8View view { data };
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if (!view.validate())
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return DecodeError::InvalidInputFormat;
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return StringView { data };
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}
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Result<Bitmap, DecodeError> Decoder::decode_bit_string(ReadonlyBytes data)
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{
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if (data.size() < 1)
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return DecodeError::InvalidInputFormat;
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auto unused_bits = data[0];
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// FIXME: It's rather annoying that `Bitmap` is always mutable.
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return Bitmap::wrap(const_cast<u8*>(data.offset_pointer(1)), data.size() * 8 - unused_bits);
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}
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Result<Tag, DecodeError> Decoder::peek()
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{
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if (m_stack.is_empty())
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return DecodeError::NoInput;
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|
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if (eof())
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return DecodeError::EndOfStream;
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if (m_current_tag.has_value())
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return m_current_tag.value();
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auto tag_or_error = read_tag();
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if (tag_or_error.is_error())
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return tag_or_error.error();
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m_current_tag = tag_or_error.value();
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return m_current_tag.value();
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}
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bool Decoder::eof() const
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{
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return m_stack.is_empty() || m_stack.last().is_empty();
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}
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Optional<DecodeError> Decoder::enter()
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{
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if (m_stack.is_empty())
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return DecodeError::NoInput;
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auto tag_or_error = peek();
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if (tag_or_error.is_error())
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return tag_or_error.error();
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auto tag = tag_or_error.value();
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if (tag.type != Type::Constructed)
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return DecodeError::EnteringNonConstructedTag;
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auto length_or_error = read_length();
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if (length_or_error.is_error())
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return length_or_error.error();
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auto length = length_or_error.value();
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auto data_or_error = read_bytes(length);
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if (data_or_error.is_error())
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return data_or_error.error();
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m_current_tag.clear();
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auto data = data_or_error.value();
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m_stack.append(data);
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return {};
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}
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Optional<DecodeError> Decoder::leave()
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{
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if (m_stack.is_empty())
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return DecodeError::NoInput;
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if (m_stack.size() == 1)
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return DecodeError::LeavingMainContext;
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m_stack.take_last();
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m_current_tag.clear();
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return {};
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}
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}
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void AK::Formatter<Crypto::ASN1::DecodeError>::format(FormatBuilder& fmtbuilder, Crypto::ASN1::DecodeError error)
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{
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using Crypto::ASN1::DecodeError;
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switch (error) {
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case DecodeError::NoInput:
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return Formatter<StringView>::format(fmtbuilder, "DecodeError(No input provided)");
|
||||
case DecodeError::NonConformingType:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Tried to read with a non-conforming type)");
|
||||
case DecodeError::EndOfStream:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(End of stream)");
|
||||
case DecodeError::NotEnoughData:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Not enough data)");
|
||||
case DecodeError::EnteringNonConstructedTag:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Tried to enter a primitive tag)");
|
||||
case DecodeError::LeavingMainContext:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Tried to leave the main context)");
|
||||
case DecodeError::InvalidInputFormat:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Input data contained invalid syntax/data)");
|
||||
case DecodeError::Overflow:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Construction would overflow)");
|
||||
case DecodeError::UnsupportedFormat:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Input data format not supported by this parser)");
|
||||
default:
|
||||
return Formatter<StringView>::format(fmtbuilder, "DecodeError(Unknown)");
|
||||
}
|
||||
}
|
||||
|
|
@ -26,449 +26,165 @@
|
|||
|
||||
#pragma once
|
||||
|
||||
#include <AK/Bitmap.h>
|
||||
#include <AK/Result.h>
|
||||
#include <AK/Types.h>
|
||||
#include <LibCrypto/ASN1/ASN1.h>
|
||||
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
|
||||
|
||||
namespace Crypto {
|
||||
namespace Crypto::ASN1 {
|
||||
|
||||
static bool der_decode_integer(const u8* in, size_t length, UnsignedBigInteger& number)
|
||||
{
|
||||
if (length < 3) {
|
||||
dbgln("invalid header size");
|
||||
return false;
|
||||
}
|
||||
|
||||
size_t x { 0 };
|
||||
// must start with 0x02
|
||||
if ((in[x++] & 0x1f) != 0x02) {
|
||||
dbgln("not an integer {} ({} follows)", in[x - 1], in[x]);
|
||||
return false;
|
||||
}
|
||||
|
||||
// decode length
|
||||
size_t z = in[x++];
|
||||
if ((x & 0x80) == 0) {
|
||||
// overflow
|
||||
if (x + z > length) {
|
||||
dbgln("would overflow {} > {}", z + x, length);
|
||||
return false;
|
||||
}
|
||||
|
||||
number = UnsignedBigInteger::import_data(in + x, z);
|
||||
return true;
|
||||
} else {
|
||||
// actual big integer
|
||||
z &= 0x7f;
|
||||
|
||||
// overflow
|
||||
if ((x + z) > length || z > 4 || z == 0) {
|
||||
dbgln("would overflow {} > {}", z + x, length);
|
||||
return false;
|
||||
}
|
||||
|
||||
size_t y = 0;
|
||||
while (z--) {
|
||||
y = ((size_t)(in[x++])) | (y << 8);
|
||||
}
|
||||
|
||||
// overflow
|
||||
if (x + y > length) {
|
||||
dbgln("would overflow {} > {}", y + x, length);
|
||||
return false;
|
||||
}
|
||||
|
||||
number = UnsignedBigInteger::import_data(in + x, y);
|
||||
return true;
|
||||
}
|
||||
|
||||
// see if it's negative
|
||||
if (in[x] & 0x80) {
|
||||
dbgln("negative bigint unsupported in der_decode_integer");
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
static bool der_length_integer(UnsignedBigInteger* num, size_t* out_length)
|
||||
{
|
||||
auto& bigint = *num;
|
||||
size_t value_length = bigint.trimmed_length() * sizeof(u32);
|
||||
auto length = value_length;
|
||||
if (length == 0) {
|
||||
++length;
|
||||
} else {
|
||||
// the number comes with a 0 padding to make it positive in 2's comp
|
||||
// add that zero if the msb is 1, but only if we haven't padded it
|
||||
// ourselves
|
||||
auto ms2b = (u16)(bigint.words()[bigint.trimmed_length() - 1] >> 16);
|
||||
|
||||
if ((ms2b & 0xff00) == 0) {
|
||||
if (!(((u8)ms2b) & 0x80))
|
||||
--length;
|
||||
} else if (ms2b & 0x8000) {
|
||||
++length;
|
||||
}
|
||||
}
|
||||
if (value_length < 128) {
|
||||
++length;
|
||||
} else {
|
||||
++length;
|
||||
while (value_length) {
|
||||
++length;
|
||||
value_length >>= 8;
|
||||
}
|
||||
}
|
||||
// kind
|
||||
++length;
|
||||
*out_length = length;
|
||||
return true;
|
||||
}
|
||||
constexpr static bool der_decode_object_identifier(const u8* in, size_t in_length, u8* words, u8* out_length)
|
||||
{
|
||||
if (in_length < 3)
|
||||
return false; // invalid header
|
||||
|
||||
if (*out_length < 2)
|
||||
return false; // need at least two words
|
||||
|
||||
size_t x { 0 };
|
||||
if ((in[x++] & 0x1f) != 0x06) {
|
||||
return false; // invalid header value
|
||||
}
|
||||
|
||||
size_t length { 0 };
|
||||
if (in[x] < 128) {
|
||||
length = in[x++];
|
||||
} else {
|
||||
if ((in[x] < 0x81) | (in[x] > 0x82))
|
||||
return false; // invalid header
|
||||
|
||||
size_t y = in[x++] & 0x7f;
|
||||
while (y--)
|
||||
length = (length << 8) | (size_t)in[x++];
|
||||
}
|
||||
|
||||
if (length < 1 || length + x > in_length)
|
||||
return false; // invalid length or overflow
|
||||
|
||||
size_t y { 0 }, t { 0 };
|
||||
while (length--) {
|
||||
t = (t << 7) | (in[x] & 0x7f);
|
||||
if (!(in[x++] & 0x80)) {
|
||||
if (y >= *out_length)
|
||||
return false; // overflow
|
||||
|
||||
if (y == 0) {
|
||||
words[0] = t / 40;
|
||||
words[1] = t % 40;
|
||||
y = 2;
|
||||
} else {
|
||||
words[y++] = t;
|
||||
}
|
||||
t = 0;
|
||||
}
|
||||
}
|
||||
*out_length = y;
|
||||
return true;
|
||||
}
|
||||
|
||||
static constexpr size_t der_object_identifier_bits(size_t x)
|
||||
{
|
||||
x &= 0xffffffff;
|
||||
size_t c { 0 };
|
||||
while (x) {
|
||||
++c;
|
||||
x >>= 1;
|
||||
}
|
||||
return c;
|
||||
}
|
||||
|
||||
constexpr static bool der_length_object_identifier(u8* words, size_t num_words, size_t* out_length)
|
||||
{
|
||||
if (num_words < 2)
|
||||
return false;
|
||||
|
||||
if (words[0] > 3 || (words[0] < 2 && words[1] > 39))
|
||||
return false;
|
||||
|
||||
size_t z { 0 };
|
||||
size_t wordbuf = words[0] * 40 + words[1];
|
||||
for (size_t y = 0; y < num_words; ++y) {
|
||||
auto t = der_object_identifier_bits(wordbuf);
|
||||
z = t / 7 + (!!(t % 7)) + (!!(wordbuf == 0));
|
||||
if (y < num_words - 1)
|
||||
wordbuf = words[y + 1];
|
||||
}
|
||||
|
||||
if (z < 128) {
|
||||
z += 2;
|
||||
} else if (z < 256) {
|
||||
z += 3;
|
||||
} else {
|
||||
z += 4;
|
||||
}
|
||||
*out_length = z;
|
||||
return true;
|
||||
}
|
||||
|
||||
constexpr static bool der_length_sequence(ASN1::List* list, size_t in_length, size_t* out_length)
|
||||
{
|
||||
size_t y { 0 }, x { 0 };
|
||||
for (size_t i = 0; i < in_length; ++i) {
|
||||
auto type = list[i].kind;
|
||||
auto size = list[i].size;
|
||||
auto data = list[i].data;
|
||||
|
||||
if (type == ASN1::Kind::Eol)
|
||||
break;
|
||||
|
||||
switch (type) {
|
||||
case ASN1::Kind::Integer:
|
||||
if (!der_length_integer((UnsignedBigInteger*)data, &x)) {
|
||||
return false;
|
||||
}
|
||||
y += x;
|
||||
break;
|
||||
case ASN1::Kind::ObjectIdentifier:
|
||||
if (!der_length_object_identifier((u8*)data, size, &x)) {
|
||||
return false;
|
||||
}
|
||||
y += x;
|
||||
break;
|
||||
case ASN1::Kind::Sequence:
|
||||
if (!der_length_sequence((ASN1::List*)data, size, &x)) {
|
||||
return false;
|
||||
}
|
||||
y += x;
|
||||
break;
|
||||
default:
|
||||
dbgln("Unhandled Kind {}", ASN1::kind_name(type));
|
||||
ASSERT_NOT_REACHED();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (y < 128) {
|
||||
y += 2;
|
||||
} else if (y < 256) {
|
||||
y += 3;
|
||||
} else if (y < 65536) {
|
||||
y += 4;
|
||||
} else if (y < 16777216ul) {
|
||||
y += 5;
|
||||
} else {
|
||||
dbgln("invalid length {}", y);
|
||||
return false;
|
||||
}
|
||||
*out_length = y;
|
||||
return true;
|
||||
}
|
||||
|
||||
static inline bool der_decode_sequence(const u8* in, size_t in_length, ASN1::List* list, size_t out_length, bool ordered = true)
|
||||
{
|
||||
if (in_length < 2) {
|
||||
dbgln("header too small");
|
||||
return false; // invalid header
|
||||
}
|
||||
size_t x { 0 };
|
||||
if (in[x++] != 0x30) {
|
||||
dbgln("not a sequence: {}", in[x - 1]);
|
||||
return false; // not a sequence
|
||||
}
|
||||
size_t block_size { 0 };
|
||||
size_t y { 0 };
|
||||
if (in[x] < 128) {
|
||||
block_size = in[x++];
|
||||
} else if (in[x] & 0x80) {
|
||||
if ((in[x] < 0x81) || (in[x] > 0x83)) {
|
||||
dbgln("invalid length element {}", in[x]);
|
||||
return false;
|
||||
}
|
||||
|
||||
y = in[x++] & 0x7f;
|
||||
|
||||
if (x + y > in_length) {
|
||||
dbgln("would overflow {} > {}", x + y, in_length);
|
||||
return false; // overflow
|
||||
}
|
||||
block_size = 0;
|
||||
while (y--)
|
||||
block_size = (block_size << 8) | (size_t)in[x++];
|
||||
}
|
||||
|
||||
// overflow
|
||||
if (x + block_size > in_length) {
|
||||
dbgln("would overflow {} > {}", x + block_size, in_length);
|
||||
return false;
|
||||
}
|
||||
|
||||
for (size_t i = 0; i < out_length; ++i)
|
||||
list[i].used = false;
|
||||
|
||||
in_length = block_size;
|
||||
for (size_t i = 0; i < out_length; ++i) {
|
||||
size_t z = 0;
|
||||
auto kind = list[i].kind;
|
||||
auto size = list[i].size;
|
||||
auto data = list[i].data;
|
||||
|
||||
if (!ordered && list[i].used) {
|
||||
continue;
|
||||
}
|
||||
|
||||
switch (kind) {
|
||||
case ASN1::Kind::Integer:
|
||||
z = in_length;
|
||||
if (!der_decode_integer(in + x, z, *(UnsignedBigInteger*)data)) {
|
||||
dbgln("could not decode an integer");
|
||||
return false;
|
||||
}
|
||||
if (!der_length_integer((UnsignedBigInteger*)data, &z)) {
|
||||
dbgln("could not figure out the length");
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
case ASN1::Kind::ObjectIdentifier:
|
||||
z = in_length;
|
||||
if (!der_decode_object_identifier(in + x, z, (u8*)data, (u8*)&size)) {
|
||||
if (!ordered)
|
||||
continue;
|
||||
return false;
|
||||
}
|
||||
list[i].size = size;
|
||||
if (!der_length_object_identifier((u8*)data, size, &z)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
case ASN1::Kind::Sequence:
|
||||
if ((in[x] & 0x3f) != 0x30) {
|
||||
dbgln("Not a sequence: {}", (in[x] & 0x3f));
|
||||
return false;
|
||||
}
|
||||
z = in_length;
|
||||
if (!der_decode_sequence(in + x, z, (ASN1::List*)data, size)) {
|
||||
if (!ordered)
|
||||
continue;
|
||||
return false;
|
||||
}
|
||||
if (!der_length_sequence((ASN1::List*)data, size, &z)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
dbgln("Unhandled ASN1 kind {}", ASN1::kind_name(kind));
|
||||
ASSERT_NOT_REACHED();
|
||||
break;
|
||||
}
|
||||
x += z;
|
||||
in_length -= z;
|
||||
list[i].used = true;
|
||||
if (!ordered)
|
||||
i = -1;
|
||||
}
|
||||
for (size_t i = 0; i < out_length; ++i)
|
||||
if (!list[i].used) {
|
||||
dbgln("index {} was not read", i);
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template<size_t element_count>
|
||||
struct der_decode_sequence_many_base {
|
||||
constexpr void set(size_t index, ASN1::Kind kind, size_t size, void* data)
|
||||
{
|
||||
ASN1::set(m_list[index], kind, data, size);
|
||||
}
|
||||
|
||||
constexpr der_decode_sequence_many_base(const u8* in, size_t in_length)
|
||||
: m_in(in)
|
||||
, m_in_length(in_length)
|
||||
{
|
||||
}
|
||||
|
||||
ASN1::List* list() { return m_list; }
|
||||
const u8* in() { return m_in; }
|
||||
size_t in_length() { return m_in_length; }
|
||||
|
||||
protected:
|
||||
ASN1::List m_list[element_count];
|
||||
const u8* m_in;
|
||||
size_t m_in_length;
|
||||
enum class DecodeError {
|
||||
NoInput,
|
||||
NonConformingType,
|
||||
EndOfStream,
|
||||
NotEnoughData,
|
||||
EnteringNonConstructedTag,
|
||||
LeavingMainContext,
|
||||
InvalidInputFormat,
|
||||
Overflow,
|
||||
UnsupportedFormat,
|
||||
};
|
||||
|
||||
template<size_t element_count>
|
||||
struct der_decode_sequence_many : public der_decode_sequence_many_base<element_count> {
|
||||
|
||||
template<typename ElementType, typename... Args>
|
||||
constexpr void construct(size_t index, ASN1::Kind kind, size_t size, ElementType data, Args... args)
|
||||
class Decoder {
|
||||
public:
|
||||
Decoder(ReadonlyBytes data)
|
||||
{
|
||||
der_decode_sequence_many_base<element_count>::set(index, kind, size, (void*)data);
|
||||
construct(index + 1, args...);
|
||||
m_stack.append(data);
|
||||
}
|
||||
|
||||
constexpr void construct(size_t index)
|
||||
// Read a tag without consuming it (and its data).
|
||||
Result<Tag, DecodeError> peek();
|
||||
|
||||
bool eof() const;
|
||||
|
||||
template<typename ValueType>
|
||||
struct TaggedValue {
|
||||
Tag tag;
|
||||
ValueType value;
|
||||
};
|
||||
|
||||
template<typename ValueType>
|
||||
Result<ValueType, DecodeError> read()
|
||||
{
|
||||
ASSERT(index == element_count);
|
||||
if (m_stack.is_empty())
|
||||
return DecodeError::NoInput;
|
||||
|
||||
if (eof())
|
||||
return DecodeError::EndOfStream;
|
||||
|
||||
auto previous_position = m_stack;
|
||||
|
||||
auto tag_or_error = peek();
|
||||
if (tag_or_error.is_error()) {
|
||||
m_stack = move(previous_position);
|
||||
return tag_or_error.error();
|
||||
}
|
||||
|
||||
auto length_or_error = read_length();
|
||||
if (length_or_error.is_error()) {
|
||||
m_stack = move(previous_position);
|
||||
return length_or_error.error();
|
||||
}
|
||||
|
||||
auto tag = tag_or_error.value();
|
||||
auto length = length_or_error.value();
|
||||
|
||||
auto value_or_error = read_value<ValueType>(tag.class_, tag.kind, length);
|
||||
if (value_or_error.is_error()) {
|
||||
m_stack = move(previous_position);
|
||||
return value_or_error.error();
|
||||
}
|
||||
|
||||
m_current_tag.clear();
|
||||
|
||||
return value_or_error.release_value();
|
||||
}
|
||||
|
||||
template<typename... Args>
|
||||
constexpr der_decode_sequence_many(const u8* in, size_t in_length, Args... args)
|
||||
: der_decode_sequence_many_base<element_count>(in, in_length)
|
||||
Optional<DecodeError> enter();
|
||||
Optional<DecodeError> leave();
|
||||
|
||||
private:
|
||||
template<typename ValueType, typename DecodedType>
|
||||
Result<ValueType, DecodeError> with_type_check(DecodedType&& value)
|
||||
{
|
||||
construct(0, args...);
|
||||
if constexpr (requires { ValueType { value }; })
|
||||
return ValueType { value };
|
||||
|
||||
return DecodeError::NonConformingType;
|
||||
}
|
||||
|
||||
constexpr operator bool()
|
||||
template<typename ValueType, typename DecodedType>
|
||||
Result<ValueType, DecodeError> with_type_check(Result<DecodedType, DecodeError>&& value_or_error)
|
||||
{
|
||||
return der_decode_sequence(this->m_in, this->m_in_length, this->m_list, element_count);
|
||||
if (value_or_error.is_error())
|
||||
return value_or_error.error();
|
||||
|
||||
auto&& value = value_or_error.value();
|
||||
if constexpr (requires { ValueType { value }; })
|
||||
return ValueType { value };
|
||||
|
||||
return DecodeError::NonConformingType;
|
||||
}
|
||||
|
||||
template<typename ValueType>
|
||||
Result<ValueType, DecodeError> read_value(Class klass, Kind kind, size_t length)
|
||||
{
|
||||
auto data_or_error = read_bytes(length);
|
||||
if (data_or_error.is_error())
|
||||
return data_or_error.error();
|
||||
auto data = data_or_error.value();
|
||||
|
||||
if (klass != Class::Universal)
|
||||
return with_type_check<ValueType>(data);
|
||||
|
||||
if (kind == Kind::Boolean)
|
||||
return with_type_check<ValueType>(decode_boolean(data));
|
||||
|
||||
if (kind == Kind::Integer)
|
||||
return with_type_check<ValueType>(decode_arbitrary_sized_integer(data));
|
||||
|
||||
if (kind == Kind::OctetString)
|
||||
return with_type_check<ValueType>(decode_octet_string(data));
|
||||
|
||||
if (kind == Kind::Null)
|
||||
return with_type_check<ValueType>(decode_null(data));
|
||||
|
||||
if (kind == Kind::ObjectIdentifier)
|
||||
return with_type_check<ValueType>(decode_object_identifier(data));
|
||||
|
||||
if (kind == Kind::PrintableString || kind == Kind::IA5String || kind == Kind::UTCTime)
|
||||
return with_type_check<ValueType>(decode_printable_string(data));
|
||||
|
||||
if (kind == Kind::Utf8String)
|
||||
return with_type_check<ValueType>(StringView { data.data(), data.size() });
|
||||
|
||||
if (kind == Kind::BitString)
|
||||
return with_type_check<ValueType>(decode_bit_string(data));
|
||||
|
||||
return with_type_check<ValueType>(data);
|
||||
}
|
||||
|
||||
Result<Tag, DecodeError> read_tag();
|
||||
Result<size_t, DecodeError> read_length();
|
||||
Result<u8, DecodeError> read_byte();
|
||||
Result<ReadonlyBytes, DecodeError> read_bytes(size_t length);
|
||||
|
||||
static Result<bool, DecodeError> decode_boolean(ReadonlyBytes);
|
||||
static Result<UnsignedBigInteger, DecodeError> decode_arbitrary_sized_integer(ReadonlyBytes);
|
||||
static Result<StringView, DecodeError> decode_octet_string(ReadonlyBytes);
|
||||
static Result<std::nullptr_t, DecodeError> decode_null(ReadonlyBytes);
|
||||
static Result<Vector<int>, DecodeError> decode_object_identifier(ReadonlyBytes);
|
||||
static Result<StringView, DecodeError> decode_printable_string(ReadonlyBytes);
|
||||
static Result<Bitmap, DecodeError> decode_bit_string(ReadonlyBytes);
|
||||
|
||||
Vector<ReadonlyBytes> m_stack;
|
||||
Optional<Tag> m_current_tag;
|
||||
};
|
||||
|
||||
// FIXME: Move these terrible constructs into their own place
|
||||
constexpr static void decode_b64_block(const u8 in[4], u8 out[3])
|
||||
{
|
||||
out[0] = (u8)(in[0] << 2 | in[1] >> 4);
|
||||
out[1] = (u8)(in[1] << 4 | in[2] >> 2);
|
||||
out[2] = (u8)(((in[2] << 6) & 0xc0) | in[3]);
|
||||
}
|
||||
|
||||
constexpr static char base64_chars[] { "|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq" };
|
||||
constexpr static size_t decode_b64(const u8* in_buffer, size_t in_length, ByteBuffer& out_buffer)
|
||||
{
|
||||
u8 in[4] { 0 }, out[3] { 0 }, v { 0 };
|
||||
size_t i { 0 }, length { 0 };
|
||||
size_t output_offset { 0 };
|
||||
|
||||
const u8* ptr = in_buffer;
|
||||
|
||||
while (ptr <= in_buffer + in_length) {
|
||||
for (length = 0, i = 0; i < 4 && (ptr <= in_buffer + in_length); ++i) {
|
||||
v = 0;
|
||||
while ((ptr <= in_buffer + in_length) && !v) {
|
||||
v = ptr[0];
|
||||
++ptr;
|
||||
v = (u8)((v < 43 || v > 122) ? 0 : base64_chars[v - 43]);
|
||||
if (v)
|
||||
v = (u8)(v == '$' ? 0 : v - 61);
|
||||
}
|
||||
if (ptr <= in_buffer + in_length) {
|
||||
++length;
|
||||
if (v)
|
||||
in[i] = v - 1;
|
||||
|
||||
} else {
|
||||
in[i] = 0;
|
||||
}
|
||||
}
|
||||
if (length) {
|
||||
decode_b64_block(in, out);
|
||||
out_buffer.overwrite(output_offset, out, length - 1);
|
||||
output_offset += length - 1;
|
||||
}
|
||||
}
|
||||
return output_offset;
|
||||
}
|
||||
}
|
||||
template<>
|
||||
struct AK::Formatter<Crypto::ASN1::DecodeError> : Formatter<StringView> {
|
||||
void format(FormatBuilder&, Crypto::ASN1::DecodeError);
|
||||
};
|
||||
|
|
|
|||
72
Userland/Libraries/LibCrypto/ASN1/PEM.cpp
Normal file
72
Userland/Libraries/LibCrypto/ASN1/PEM.cpp
Normal file
|
|
@ -0,0 +1,72 @@
|
|||
/*
|
||||
* Copyright (c) 2021, the SerenityOS developers.
|
||||
* 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.
|
||||
*
|
||||
* 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. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
|
||||
*/
|
||||
|
||||
#include <AK/Base64.h>
|
||||
#include <AK/GenericLexer.h>
|
||||
#include <LibCrypto/ASN1/PEM.h>
|
||||
|
||||
namespace Crypto {
|
||||
|
||||
ByteBuffer decode_pem(ReadonlyBytes data)
|
||||
{
|
||||
GenericLexer lexer { data };
|
||||
ByteBuffer decoded;
|
||||
|
||||
// FIXME: Parse multiple.
|
||||
enum {
|
||||
PreStartData,
|
||||
Started,
|
||||
Ended,
|
||||
} state { PreStartData };
|
||||
while (!lexer.is_eof()) {
|
||||
switch (state) {
|
||||
case PreStartData:
|
||||
if (lexer.consume_specific("-----BEGIN"))
|
||||
state = Started;
|
||||
lexer.consume_line();
|
||||
break;
|
||||
case Started: {
|
||||
if (lexer.consume_specific("-----END")) {
|
||||
state = Ended;
|
||||
lexer.consume_line();
|
||||
break;
|
||||
}
|
||||
auto b64decoded = decode_base64(lexer.consume_line().trim_whitespace(TrimMode::Right));
|
||||
decoded.append(b64decoded.data(), b64decoded.size());
|
||||
break;
|
||||
}
|
||||
case Ended:
|
||||
lexer.consume_all();
|
||||
break;
|
||||
default:
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
return decoded;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -32,44 +32,6 @@
|
|||
|
||||
namespace Crypto {
|
||||
|
||||
static inline ByteBuffer decode_pem(ReadonlyBytes data_in, size_t cert_index = 0)
|
||||
{
|
||||
size_t i { 0 };
|
||||
size_t start_at { 0 };
|
||||
size_t idx { 0 };
|
||||
size_t input_length = data_in.size();
|
||||
auto alloc_len = input_length / 4 * 3;
|
||||
auto output = ByteBuffer::create_uninitialized(alloc_len);
|
||||
|
||||
for (i = 0; i < input_length; i++) {
|
||||
if ((data_in[i] == '\n') || (data_in[i] == '\r'))
|
||||
continue;
|
||||
|
||||
if (data_in[i] != '-') {
|
||||
// Read entire line.
|
||||
while ((i < input_length) && (data_in[i] != '\n'))
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (data_in[i] == '-') {
|
||||
auto end_idx = i;
|
||||
// Read until end of line.
|
||||
while ((i < input_length) && (data_in[i] != '\n'))
|
||||
i++;
|
||||
if (start_at) {
|
||||
if (cert_index > 0) {
|
||||
cert_index--;
|
||||
start_at = 0;
|
||||
} else {
|
||||
idx = decode_b64(data_in.offset(start_at), end_idx - start_at, output);
|
||||
break;
|
||||
}
|
||||
} else
|
||||
start_at = i + 1;
|
||||
}
|
||||
}
|
||||
return output.slice(0, idx);
|
||||
}
|
||||
ByteBuffer decode_pem(ReadonlyBytes);
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,4 +1,7 @@
|
|||
set(SOURCES
|
||||
ASN1/ASN1.cpp
|
||||
ASN1/DER.cpp
|
||||
ASN1/PEM.cpp
|
||||
Authentication/GHash.cpp
|
||||
BigInt/SignedBigInteger.cpp
|
||||
BigInt/UnsignedBigInteger.cpp
|
||||
|
|
|
|||
|
|
@ -26,6 +26,7 @@
|
|||
|
||||
#include <AK/Debug.h>
|
||||
#include <AK/Random.h>
|
||||
#include <AK/ScopeGuard.h>
|
||||
#include <LibCrypto/ASN1/ASN1.h>
|
||||
#include <LibCrypto/ASN1/DER.h>
|
||||
#include <LibCrypto/ASN1/PEM.h>
|
||||
|
|
@ -34,84 +35,194 @@
|
|||
namespace Crypto {
|
||||
namespace PK {
|
||||
|
||||
RSA::KeyPairType RSA::parse_rsa_key(ReadonlyBytes in)
|
||||
static constexpr Array<int, 7> pkcs8_rsa_key_oid { 1, 2, 840, 113549, 1, 1, 1 };
|
||||
|
||||
RSA::KeyPairType RSA::parse_rsa_key(ReadonlyBytes der)
|
||||
{
|
||||
// we are going to assign to at least one of these
|
||||
KeyPairType keypair;
|
||||
// TODO: move ASN parsing logic out
|
||||
u64 t, x, y, z, tmp_oid[16];
|
||||
u8 tmp_buf[4096] { 0 };
|
||||
UnsignedBigInteger n, e, d;
|
||||
ASN1::List pubkey_hash_oid[2], pubkey[2];
|
||||
|
||||
ASN1::set(pubkey_hash_oid[0], ASN1::Kind::ObjectIdentifier, tmp_oid, sizeof(tmp_oid) / sizeof(tmp_oid[0]));
|
||||
ASN1::set(pubkey_hash_oid[1], ASN1::Kind::Null, nullptr, 0);
|
||||
ASN1::Decoder decoder(der);
|
||||
// There are four possible (supported) formats:
|
||||
// PKCS#1 private key
|
||||
// PKCS#1 public key
|
||||
// PKCS#8 private key
|
||||
// PKCS#8 public key
|
||||
|
||||
// DER is weird in that it stores pubkeys as bitstrings
|
||||
// we must first extract that crap
|
||||
ASN1::set(pubkey[0], ASN1::Kind::Sequence, &pubkey_hash_oid, 2);
|
||||
ASN1::set(pubkey[1], ASN1::Kind::Null, nullptr, 0);
|
||||
// They're all a single sequence, so let's check that first
|
||||
{
|
||||
auto result = decoder.peek();
|
||||
if (result.is_error()) {
|
||||
// Bad data.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA key parse failed: {}", result.error());
|
||||
return keypair;
|
||||
}
|
||||
auto tag = result.value();
|
||||
if (tag.kind != ASN1::Kind::Sequence) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA key parse failed: Expected a Sequence but got {}", ASN1::kind_name(tag.kind));
|
||||
return keypair;
|
||||
}
|
||||
}
|
||||
|
||||
dbgln("we were offered {} bytes of input", in.size());
|
||||
// Then enter the sequence
|
||||
{
|
||||
auto error = decoder.enter();
|
||||
if (error.has_value()) {
|
||||
// Something was weird with the input.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA key parse failed: {}", error.value());
|
||||
return keypair;
|
||||
}
|
||||
}
|
||||
|
||||
if (der_decode_sequence(in.data(), in.size(), pubkey, 2)) {
|
||||
// yay, now we have to reassemble the bitstring to a bytestring
|
||||
t = 0;
|
||||
y = 0;
|
||||
z = 0;
|
||||
x = 0;
|
||||
for (; x < pubkey[1].size; ++x) {
|
||||
y = (y << 1) | tmp_buf[x];
|
||||
if (++z == 8) {
|
||||
tmp_buf[t++] = (u8)y;
|
||||
y = 0;
|
||||
z = 0;
|
||||
bool has_read_error = false;
|
||||
|
||||
const auto check_if_pkcs8_rsa_key = [&] {
|
||||
// see if it's a sequence:
|
||||
auto tag_result = decoder.peek();
|
||||
if (tag_result.is_error()) {
|
||||
// Decode error :shrug:
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: {}", tag_result.error());
|
||||
return false;
|
||||
}
|
||||
|
||||
auto tag = tag_result.value();
|
||||
if (tag.kind != ASN1::Kind::Sequence) {
|
||||
// We don't know what this is, but it sure isn't a PKCS#8 key.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: Expected a Sequence but got {}", ASN1::kind_name(tag.kind));
|
||||
return false;
|
||||
}
|
||||
|
||||
// It's a sequence, now let's see if it's actually an RSA key.
|
||||
auto error = decoder.enter();
|
||||
if (error.has_value()) {
|
||||
// Shenanigans!
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: {}", error.value());
|
||||
return false;
|
||||
}
|
||||
|
||||
ScopeGuard leave { [&] {
|
||||
auto error = decoder.leave();
|
||||
if (error.has_value()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA key parse failed: {}", error.value());
|
||||
has_read_error = true;
|
||||
}
|
||||
} };
|
||||
|
||||
// Now let's read the OID.
|
||||
auto oid_result = decoder.read<Vector<int>>();
|
||||
if (oid_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: {}", oid_result.error());
|
||||
return false;
|
||||
}
|
||||
// now the buffer is correct (Sequence { Integer, Integer })
|
||||
if (!der_decode_sequence_many<2>(tmp_buf, t,
|
||||
ASN1::Kind::Integer, 1, &n,
|
||||
ASN1::Kind::Integer, 1, &e)) {
|
||||
// something was fucked up
|
||||
dbgln("bad pubkey: e={} n={}", e, n);
|
||||
|
||||
auto oid = oid_result.release_value();
|
||||
// Now let's check that the OID matches "RSA key"
|
||||
if (oid != pkcs8_rsa_key_oid) {
|
||||
// Oh well. not an RSA key at all.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: Not an RSA key");
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
};
|
||||
|
||||
auto integer_result = decoder.read<UnsignedBigInteger>();
|
||||
|
||||
if (!integer_result.is_error()) {
|
||||
auto first_integer = integer_result.release_value();
|
||||
|
||||
// It's either a PKCS#1 key, or a PKCS#8 private key.
|
||||
// Check for the PKCS#8 private key right away.
|
||||
if (check_if_pkcs8_rsa_key()) {
|
||||
if (has_read_error)
|
||||
return keypair;
|
||||
// Now read the private key, which is actually an octet string containing the PKCS#1 encoded private key.
|
||||
auto data_result = decoder.read<StringView>();
|
||||
if (data_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 private key parse failed: {}", data_result.error());
|
||||
return keypair;
|
||||
}
|
||||
return parse_rsa_key(data_result.value().bytes());
|
||||
}
|
||||
|
||||
if (has_read_error)
|
||||
return keypair;
|
||||
|
||||
// It's not a PKCS#8 key, so it's a PKCS#1 key (or something we don't support)
|
||||
// if the first integer is zero or one, it's a private key.
|
||||
if (first_integer == 0) {
|
||||
// This is a private key, parse the rest.
|
||||
auto modulus_result = decoder.read<UnsignedBigInteger>();
|
||||
if (modulus_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#1 private key parse failed: {}", modulus_result.error());
|
||||
return keypair;
|
||||
}
|
||||
auto modulus = modulus_result.release_value();
|
||||
|
||||
auto public_exponent_result = decoder.read<UnsignedBigInteger>();
|
||||
if (public_exponent_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#1 private key parse failed: {}", public_exponent_result.error());
|
||||
return keypair;
|
||||
}
|
||||
auto public_exponent = public_exponent_result.release_value();
|
||||
|
||||
auto private_exponent_result = decoder.read<UnsignedBigInteger>();
|
||||
if (private_exponent_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#1 private key parse failed: {}", private_exponent_result.error());
|
||||
return keypair;
|
||||
}
|
||||
auto private_exponent = private_exponent_result.release_value();
|
||||
|
||||
// Drop the rest of the fields on the floor, we don't use them.
|
||||
// FIXME: Actually use them...
|
||||
keypair.private_key = { modulus, move(private_exponent), public_exponent };
|
||||
keypair.public_key = { move(modulus), move(public_exponent) };
|
||||
|
||||
return keypair;
|
||||
} else if (first_integer == 1) {
|
||||
// This is a multi-prime key, we don't support that.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#1 private key parse failed: Multi-prime key not supported");
|
||||
return keypair;
|
||||
} else {
|
||||
auto&& modulus = move(first_integer);
|
||||
|
||||
// Try reading a public key, `first_integer` is the modulus.
|
||||
auto public_exponent_result = decoder.read<UnsignedBigInteger>();
|
||||
if (public_exponent_result.is_error()) {
|
||||
// Bad public key.
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#1 public key parse failed: {}", public_exponent_result.error());
|
||||
return keypair;
|
||||
}
|
||||
|
||||
auto public_exponent = public_exponent_result.release_value();
|
||||
keypair.public_key.set(move(modulus), move(public_exponent));
|
||||
|
||||
return keypair;
|
||||
}
|
||||
// correct public key
|
||||
keypair.public_key.set(n, e);
|
||||
return keypair;
|
||||
}
|
||||
|
||||
// could be a private key
|
||||
if (!der_decode_sequence_many<1>(in.data(), in.size(),
|
||||
ASN1::Kind::Integer, 1, &n)) {
|
||||
// that's no key
|
||||
// that's a death star
|
||||
dbgln("that's a death star");
|
||||
return keypair;
|
||||
}
|
||||
} else {
|
||||
// It wasn't a PKCS#1 key, let's try our luck with PKCS#8.
|
||||
if (!check_if_pkcs8_rsa_key())
|
||||
return keypair;
|
||||
|
||||
if (n == 0) {
|
||||
// it is a private key
|
||||
UnsignedBigInteger zero;
|
||||
if (!der_decode_sequence_many<4>(in.data(), in.size(),
|
||||
ASN1::Kind::Integer, 1, &zero,
|
||||
ASN1::Kind::Integer, 1, &n,
|
||||
ASN1::Kind::Integer, 1, &e,
|
||||
ASN1::Kind::Integer, 1, &d)) {
|
||||
dbgln("bad privkey n={} e={} d={}", n, e, d);
|
||||
if (has_read_error)
|
||||
return keypair;
|
||||
|
||||
// Now we have a bit string, which contains the PKCS#1 encoded public key.
|
||||
auto data_result = decoder.read<Bitmap>();
|
||||
if (data_result.is_error()) {
|
||||
dbgln_if(RSA_PARSE_DEBUG, "RSA PKCS#8 public key parse failed: {}", data_result.error());
|
||||
return keypair;
|
||||
}
|
||||
keypair.private_key.set(n, d, e);
|
||||
return keypair;
|
||||
|
||||
// Now just read it as a PKCS#1 DER.
|
||||
auto data = data_result.release_value();
|
||||
// FIXME: This is pretty awkward, maybe just generate a zero'd out ByteBuffer from the parser instead?
|
||||
auto padded_data = ByteBuffer::create_zeroed(data.size_in_bytes());
|
||||
padded_data.overwrite(0, data.data(), data.size_in_bytes());
|
||||
|
||||
return parse_rsa_key(padded_data.bytes());
|
||||
}
|
||||
if (n == 1) {
|
||||
// multiprime key, we don't know how to deal with this
|
||||
dbgln("Unsupported key type");
|
||||
return keypair;
|
||||
}
|
||||
// it's a broken public key
|
||||
keypair.public_key.set(n, 65537);
|
||||
return keypair;
|
||||
}
|
||||
|
||||
void RSA::encrypt(ReadonlyBytes in, Bytes& out)
|
||||
|
|
|
|||
|
|
@ -35,12 +35,13 @@
|
|||
|
||||
namespace Crypto {
|
||||
namespace PK {
|
||||
template<typename Integer = u64>
|
||||
template<typename Integer = UnsignedBigInteger>
|
||||
class RSAPublicKey {
|
||||
public:
|
||||
RSAPublicKey(const Integer& n, const Integer& e)
|
||||
: m_modulus(n)
|
||||
, m_public_exponent(e)
|
||||
RSAPublicKey(Integer n, Integer e)
|
||||
: m_modulus(move(n))
|
||||
, m_public_exponent(move(e))
|
||||
, m_length(m_modulus.trimmed_length() * sizeof(u32))
|
||||
{
|
||||
}
|
||||
|
||||
|
|
@ -57,11 +58,11 @@ public:
|
|||
size_t length() const { return m_length; }
|
||||
void set_length(size_t length) { m_length = length; }
|
||||
|
||||
void set(const Integer& n, const Integer& e)
|
||||
void set(Integer n, Integer e)
|
||||
{
|
||||
m_modulus = n;
|
||||
m_public_exponent = e;
|
||||
m_length = (n.trimmed_length() * sizeof(u32));
|
||||
m_modulus = move(n);
|
||||
m_public_exponent = move(e);
|
||||
m_length = (m_modulus.trimmed_length() * sizeof(u32));
|
||||
}
|
||||
|
||||
private:
|
||||
|
|
@ -73,10 +74,11 @@ private:
|
|||
template<typename Integer = UnsignedBigInteger>
|
||||
class RSAPrivateKey {
|
||||
public:
|
||||
RSAPrivateKey(const Integer& n, const Integer& d, const Integer& e)
|
||||
: m_modulus(n)
|
||||
, m_private_exponent(d)
|
||||
, m_public_exponent(e)
|
||||
RSAPrivateKey(Integer n, Integer d, Integer e)
|
||||
: m_modulus(move(n))
|
||||
, m_private_exponent(move(d))
|
||||
, m_public_exponent(move(e))
|
||||
, m_length(m_modulus.trimmed_length() * sizeof(u32))
|
||||
{
|
||||
}
|
||||
|
||||
|
|
@ -91,12 +93,12 @@ public:
|
|||
size_t length() const { return m_length; }
|
||||
void set_length(size_t length) { m_length = length; }
|
||||
|
||||
void set(const Integer& n, const Integer& d, const Integer& e)
|
||||
void set(Integer n, Integer d, Integer e)
|
||||
{
|
||||
m_modulus = n;
|
||||
m_private_exponent = d;
|
||||
m_public_exponent = e;
|
||||
m_length = (n.length() * sizeof(u32));
|
||||
m_modulus = move(n);
|
||||
m_private_exponent = move(d);
|
||||
m_public_exponent = move(e);
|
||||
m_length = m_modulus.trimmed_length() * sizeof(u32);
|
||||
}
|
||||
|
||||
private:
|
||||
|
|
@ -120,7 +122,7 @@ class RSA : public PKSystem<RSAPrivateKey<IntegerType>, RSAPublicKey<IntegerType
|
|||
public:
|
||||
using KeyPairType = RSAKeyPair<PublicKeyType, PrivateKeyType>;
|
||||
|
||||
static KeyPairType parse_rsa_key(ReadonlyBytes);
|
||||
static KeyPairType parse_rsa_key(ReadonlyBytes der);
|
||||
static KeyPairType generate_key_pair(size_t bits = 256)
|
||||
{
|
||||
IntegerType e { 65537 }; // :P
|
||||
|
|
|
|||
|
|
@ -839,7 +839,7 @@ bool TLSv12::add_client_key(ReadonlyBytes certificate_pem_buffer, ReadonlyBytes
|
|||
if (certificate_pem_buffer.is_empty() || rsa_key.is_empty()) {
|
||||
return true;
|
||||
}
|
||||
auto decoded_certificate = Crypto::decode_pem(certificate_pem_buffer, 0);
|
||||
auto decoded_certificate = Crypto::decode_pem(certificate_pem_buffer);
|
||||
if (decoded_certificate.is_empty()) {
|
||||
dbgln("Certificate not PEM");
|
||||
return false;
|
||||
|
|
|
|||
|
|
@ -1970,8 +1970,9 @@ static void rsa_emsa_pss_test_create()
|
|||
|
||||
static void rsa_test_der_parse()
|
||||
{
|
||||
I_TEST((RSA | ASN1 DER / PEM encoded Key import));
|
||||
auto privkey = R"(-----BEGIN RSA PRIVATE KEY-----
|
||||
{
|
||||
I_TEST((RSA | ASN1 PKCS1 DER / PEM encoded Key import));
|
||||
auto privkey = R"(-----BEGIN RSA PRIVATE KEY-----
|
||||
MIIBOgIBAAJBAJsrIYHxs1YL9tpfodaWs1lJoMdF4kgFisUFSj6nvBhJUlmBh607AlgTaX0E
|
||||
DGPYycXYGZ2n6rqmms5lpDXBpUcCAwEAAQJAUNpPkmtEHDENxsoQBUXvXDYeXdePSiIBJhpU
|
||||
joNOYoR5R9z5oX2cpcyykQ58FC2vKKg+x8N6xczG7qO95tw5UQIhAN354CP/FA+uTeJ6KJ+i
|
||||
|
|
@ -1980,14 +1981,57 @@ IQCTjYI861Y+hjMnlORkGSdvWlTHUj6gjEOh4TlWeJzQoQIgAxMZOQKtxCZUuxFwzRq4xLRG
|
|||
nrDlBQpuxz7bwSyQO7UCIHrYMnDohgNbwtA5ZpW3H1cKKQQvueWm6sxW9P5sUrZ3
|
||||
-----END RSA PRIVATE KEY-----)";
|
||||
|
||||
Crypto::PK::RSA rsa(privkey);
|
||||
if (rsa.public_key().public_exponent() == 65537) {
|
||||
if (rsa.private_key().private_exponent() == "4234603516465654167360850580101327813936403862038934287300450163438938741499875303761385527882335478349599685406941909381269804396099893549838642251053393"_bigint) {
|
||||
PASS;
|
||||
} else
|
||||
FAIL(Invalid private exponent);
|
||||
} else {
|
||||
FAIL(Invalid public exponent);
|
||||
Crypto::PK::RSA rsa(privkey);
|
||||
if (rsa.public_key().public_exponent() == 65537) {
|
||||
if (rsa.private_key().private_exponent() == "4234603516465654167360850580101327813936403862038934287300450163438938741499875303761385527882335478349599685406941909381269804396099893549838642251053393"_bigint) {
|
||||
PASS;
|
||||
} else
|
||||
FAIL(Invalid private exponent);
|
||||
} else {
|
||||
FAIL(Invalid public exponent);
|
||||
}
|
||||
}
|
||||
|
||||
{
|
||||
I_TEST((RSA | ASN1 PKCS8 DER / PEM encoded Key import));
|
||||
auto privkey = R"(-----BEGIN PRIVATE KEY-----
|
||||
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC7ZBYaG9+CcJP7
|
||||
WVFJRI/uw3hljc7WpzeYs8MN82/g9CG1gnEF3P3ZSBdWVr8gnbh05EsSGHKghIce
|
||||
CB7DNrM5Ab0ru04CuODdPx56xCj+4MmzTc/aq79ntmOt131NGHgq9yVwfJqnSpyl
|
||||
OoVw7j/Wg4ciwPDQaeLmD1BsE/W9UsF1km7DWasBpW5br82DpudKgJq2Ixf52+rY
|
||||
TCkMgyWcetx4MfXll4y5ZVtJXCnHJfkCS64EaCqXmClP4ovOuHH4khJ3rW9j4yuL
|
||||
e5ck3PSXOrtOTR43HZkCXzseCkbW7qKSmk/9ZreImOzOgu8vvw7ewLAQR9qYVS6X
|
||||
PXY8IilDAgMBAAECggEBAIV3ld5mt90Z/exqA2Fh+fofMyNxyz5Lv2d9sZHAL5FT
|
||||
kKbND18TtaIKnMSb6Gl8rKJk76slyo7Vlb8oHXEBBsm1mV0KfVenAlHS4QyjpmdT
|
||||
B5Yz97VR2nQuDfUFpHNC2GQRv5LMzQIWPFfaxKxYpRNOfvOb5Gks4bTmd2tjFAYR
|
||||
MCbHgPw1liKA9dYKk4NB0301EY05e4Zz8RjqYHkkmOPD7DnjFbHqcFUjVKK5E3vD
|
||||
WjxNXUbiSudCCN7WLEOyeHZNd+l6kSAVxZuCAp0G3Da5ndXgIStcy4hYi/fL3XQQ
|
||||
bNpxjfhsjlD3tdHNr3NNYDAqxcxpsyO1NCpCIW3ZVrECgYEA7l6gTZ3e9AiSNlMd
|
||||
2O2vNnbQ6UZfsEfu2y7HmpCuNJkFkAnM/1h72Krejnn31rRuR6uCFn4YgQUN9Eq0
|
||||
E1PJCtTay2ucZw5rqtkewT9QzXvVD9eiGM+MF89UzSCC+dOW0/odkD+xP2evnPvG
|
||||
PbXztnuERC1pi0YWLj1YcsfsEX0CgYEAyUA2UtYjnvCcteIy+rURT0aoZ9tDMrG+
|
||||
Es42EURVv1sduVdUst5R+bXx1aDzpCkcdni3TyxeosvTGAZngI3O8ghh1GV7NPZR
|
||||
nkiPXjMnhL0Zf+X9gCA6TFANfPuWhMSGijYsCd46diKGDReGYUnmcN9XopeG1h6i
|
||||
3JiOuVPAIb8CgYBmIcUtfGb6yHFdNV+kgrJ/84ivaqe1MBz3bKO5ZiQ+BRKNFKXx
|
||||
AkiOHSgeg8PdCpH1w1aJrJ1zKmdANIHThiKtsWXNot3wig03tq+mvSox4Mz5bLrX
|
||||
RpYP3ZXIDhYQVMhbKt9f3upi8FoeOQJHjp5Nob6aN5rxQaZfSYmMJHzRQQKBgQCO
|
||||
ALwUGTtLNBYvlKtKEadkG8RKfAFfbOFkXZLy/hfPDRjdJY0DJTIMk+BPT+F6rPOD
|
||||
eMxHllQ0ZMPPiP1RTT5/s4BsISsdhMy0dhiLbGbvF4s9nugPly3rmPTbgp6DkjQo
|
||||
o+7RC7iOkO+rnzTXwxBSBpXMiUTAIx/hrdfPVxQT+wKBgCh7N3OLIOH6EWcW1fif
|
||||
UoENh8rkt/kzm89G1JLwBhuBIBPXUEZt2dS/xSUempqVqFGONpP87gvqxkMTtgCA
|
||||
73KXn/cxHWM2kmXyHA3kQlOYw6WHjpldQAxLE+TRHXO2JUtZ09Mu4rVXX7lmwbTm
|
||||
l3vmuDEF3/Bo1C1HTg0xRV/l
|
||||
-----END PRIVATE KEY-----)";
|
||||
|
||||
Crypto::PK::RSA rsa(privkey);
|
||||
if (rsa.public_key().public_exponent() == 65537) {
|
||||
if (rsa.private_key().private_exponent() == "16848664331299797559656678180469464902267415922431923391961407795209879741791261105581093539484181644099608161661780611501562625272630894063592208758992911105496755004417051031019663332258403844985328863382168329621318366311519850803972480500782200178279692319955495383119697563295214236936264406600739633470565823022975212999060908747002623721589308539473108154612454595201561671949550531384574873324370774408913092560971930541734744950937900805812300970883306404011323308000168926094053141613790857814489531436452649384151085451448183385611208320292948291211969430321231180227006521681776197974694030147965578466993"_bigint) {
|
||||
PASS;
|
||||
} else
|
||||
FAIL(Invalid private exponent);
|
||||
} else {
|
||||
FAIL(Invalid public exponent);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue