From ca78d9a5289354f85607f92f68713b25df4fb6ad Mon Sep 17 00:00:00 2001 From: Tom Sepez Date: Wed, 9 Mar 2016 11:51:13 -0800 Subject: Split off IPDF_SecurityHandler and CPDF_StandardSecurityHandler. R=dsinclair@chromium.org Review URL: https://codereview.chromium.org/1781593003 . --- core/include/fpdfapi/fpdf_parser.h | 120 +--- core/include/fpdfapi/ipdf_security_handler.h | 36 ++ core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp | 1 + core/src/fpdfapi/fpdf_parser/cpdf_parser.cpp | 1 + .../fpdf_parser/cpdf_standard_security_handler.cpp | 709 +++++++++++++++++++++ .../fpdf_parser/cpdf_standard_security_handler.h | 105 +++ .../fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp | 694 +------------------- 7 files changed, 854 insertions(+), 812 deletions(-) create mode 100644 core/include/fpdfapi/ipdf_security_handler.h create mode 100644 core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp create mode 100644 core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h (limited to 'core') diff --git a/core/include/fpdfapi/fpdf_parser.h b/core/include/fpdfapi/fpdf_parser.h index 06030701b4..2134d0159b 100644 --- a/core/include/fpdfapi/fpdf_parser.h +++ b/core/include/fpdfapi/fpdf_parser.h @@ -64,125 +64,6 @@ class ScopedSetInsertion { // Indexed by 8-bit char code, contains unicode code points. extern const FX_WORD PDFDocEncoding[256]; -#define FXCIPHER_NONE 0 -#define FXCIPHER_RC4 1 -#define FXCIPHER_AES 2 -#define FXCIPHER_AES2 3 - -class IPDF_SecurityHandler { - public: - virtual ~IPDF_SecurityHandler() {} - - virtual FX_BOOL OnInit(CPDF_Parser* pParser, - CPDF_Dictionary* pEncryptDict) = 0; - - virtual FX_DWORD GetPermissions() = 0; - virtual FX_BOOL GetCryptInfo(int& cipher, - const uint8_t*& buffer, - int& keylen) = 0; - - virtual FX_BOOL IsMetadataEncrypted() = 0; - virtual CPDF_CryptoHandler* CreateCryptoHandler() = 0; -}; - -#define PDF_ENCRYPT_CONTENT 0 - -class CPDF_StandardSecurityHandler : public IPDF_SecurityHandler { - public: - CPDF_StandardSecurityHandler(); - ~CPDF_StandardSecurityHandler() override; - - // IPDF_SecurityHandler: - FX_BOOL OnInit(CPDF_Parser* pParser, CPDF_Dictionary* pEncryptDict) override; - FX_DWORD GetPermissions() override; - FX_BOOL GetCryptInfo(int& cipher, - const uint8_t*& buffer, - int& keylen) override; - FX_BOOL IsMetadataEncrypted() override; - CPDF_CryptoHandler* CreateCryptoHandler() override; - - void OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - const uint8_t* owner_pass, - FX_DWORD owner_size, - FX_DWORD type = PDF_ENCRYPT_CONTENT); - - void OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - FX_DWORD type = PDF_ENCRYPT_CONTENT); - - CFX_ByteString GetUserPassword(const uint8_t* owner_pass, - FX_DWORD pass_size, - int32_t key_len); - int CheckPassword(const uint8_t* password, - FX_DWORD pass_size, - FX_BOOL bOwner, - uint8_t* key, - int key_len); - - private: - int m_Version; - - int m_Revision; - - CPDF_Parser* m_pParser; - - CPDF_Dictionary* m_pEncryptDict; - - FX_BOOL LoadDict(CPDF_Dictionary* pEncryptDict); - FX_BOOL LoadDict(CPDF_Dictionary* pEncryptDict, - FX_DWORD type, - int& cipher, - int& key_len); - - FX_BOOL CheckUserPassword(const uint8_t* password, - FX_DWORD pass_size, - FX_BOOL bIgnoreEncryptMeta, - uint8_t* key, - int32_t key_len); - - FX_BOOL CheckOwnerPassword(const uint8_t* password, - FX_DWORD pass_size, - uint8_t* key, - int32_t key_len); - FX_BOOL AES256_CheckPassword(const uint8_t* password, - FX_DWORD size, - FX_BOOL bOwner, - uint8_t* key); - void AES256_SetPassword(CPDF_Dictionary* pEncryptDict, - const uint8_t* password, - FX_DWORD size, - FX_BOOL bOwner, - const uint8_t* key); - void AES256_SetPerms(CPDF_Dictionary* pEncryptDict, - FX_DWORD permission, - FX_BOOL bEncryptMetadata, - const uint8_t* key); - void OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - const uint8_t* owner_pass, - FX_DWORD owner_size, - FX_BOOL bDefault, - FX_DWORD type); - FX_BOOL CheckSecurity(int32_t key_len); - - FX_DWORD m_Permissions; - - int m_Cipher; - - uint8_t m_EncryptKey[32]; - - int m_KeyLen; -}; - -IPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler(); - class CPDF_CryptoHandler { public: virtual ~CPDF_CryptoHandler() {} @@ -215,6 +96,7 @@ class CPDF_CryptoHandler { void Decrypt(FX_DWORD objnum, FX_DWORD version, CFX_ByteString& str); }; + class CPDF_StandardCryptoHandler : public CPDF_CryptoHandler { public: CPDF_StandardCryptoHandler(); diff --git a/core/include/fpdfapi/ipdf_security_handler.h b/core/include/fpdfapi/ipdf_security_handler.h new file mode 100644 index 0000000000..699cf38c3a --- /dev/null +++ b/core/include/fpdfapi/ipdf_security_handler.h @@ -0,0 +1,36 @@ +// Copyright 2016 PDFium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com + +#ifndef CORE_INCLUDE_FPDFAPI_IPDF_SECURITY_HANDLER_H_ +#define CORE_INCLUDE_FPDFAPI_IPDF_SECURITY_HANDLER_H_ + +#include "core/include/fxcrt/fx_system.h" + +class CPDF_Parser; +class CPDF_Dictionary; +class CPDF_CryptoHandler; + +#define FXCIPHER_NONE 0 +#define FXCIPHER_RC4 1 +#define FXCIPHER_AES 2 +#define FXCIPHER_AES2 3 + +class IPDF_SecurityHandler { + public: + virtual ~IPDF_SecurityHandler(); + virtual FX_BOOL OnInit(CPDF_Parser* pParser, + CPDF_Dictionary* pEncryptDict) = 0; + + virtual FX_DWORD GetPermissions() = 0; + virtual FX_BOOL GetCryptInfo(int& cipher, + const uint8_t*& buffer, + int& keylen) = 0; + + virtual FX_BOOL IsMetadataEncrypted() = 0; + virtual CPDF_CryptoHandler* CreateCryptoHandler() = 0; +}; + +#endif // CORE_INCLUDE_FPDFAPI_IPDF_SECURITY_HANDLER_H_ diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp index 88bd272e1e..4cfafc51b6 100644 --- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp +++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp @@ -13,6 +13,7 @@ #include "core/include/fpdfapi/fpdf_parser.h" #include "core/include/fpdfapi/fpdf_serial.h" #include "core/include/fxcrt/fx_ext.h" +#include "core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h" #include "third_party/base/stl_util.h" #define PDF_OBJECTSTREAM_MAXLENGTH (256 * 1024) diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/src/fpdfapi/fpdf_parser/cpdf_parser.cpp index b7d1012b85..675eec8f3a 100644 --- a/core/src/fpdfapi/fpdf_parser/cpdf_parser.cpp +++ b/core/src/fpdfapi/fpdf_parser/cpdf_parser.cpp @@ -12,6 +12,7 @@ #include "core/include/fpdfapi/fpdf_parser.h" #include "core/include/fxcrt/fx_ext.h" #include "core/include/fxcrt/fx_safe_types.h" +#include "core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h" #include "core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h" #include "core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.h" #include "third_party/base/stl_util.h" diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp new file mode 100644 index 0000000000..84da42ec19 --- /dev/null +++ b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp @@ -0,0 +1,709 @@ +// Copyright 2014 PDFium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com + +#include "core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h" + +#include "core/include/fdrm/fx_crypt.h" +#include "core/include/fpdfapi/cpdf_parser.h" +#include "core/include/fpdfapi/fpdf_parser.h" + +namespace { + +const uint8_t defpasscode[32] = { + 0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, + 0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, + 0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a}; + +void CalcEncryptKey(CPDF_Dictionary* pEncrypt, + const uint8_t* password, + FX_DWORD pass_size, + uint8_t* key, + int keylen, + FX_BOOL bIgnoreMeta, + CPDF_Array* pIdArray) { + int revision = pEncrypt->GetIntegerBy("R"); + uint8_t passcode[32]; + for (FX_DWORD i = 0; i < 32; i++) { + passcode[i] = i < pass_size ? password[i] : defpasscode[i - pass_size]; + } + uint8_t md5[100]; + CRYPT_MD5Start(md5); + CRYPT_MD5Update(md5, passcode, 32); + CFX_ByteString okey = pEncrypt->GetStringBy("O"); + CRYPT_MD5Update(md5, (uint8_t*)okey.c_str(), okey.GetLength()); + FX_DWORD perm = pEncrypt->GetIntegerBy("P"); + CRYPT_MD5Update(md5, (uint8_t*)&perm, 4); + if (pIdArray) { + CFX_ByteString id = pIdArray->GetStringAt(0); + CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); + } + if (!bIgnoreMeta && revision >= 3 && + !pEncrypt->GetIntegerBy("EncryptMetadata", 1)) { + FX_DWORD tag = (FX_DWORD)-1; + CRYPT_MD5Update(md5, (uint8_t*)&tag, 4); + } + uint8_t digest[16]; + CRYPT_MD5Finish(md5, digest); + FX_DWORD copy_len = keylen; + if (copy_len > sizeof(digest)) { + copy_len = sizeof(digest); + } + if (revision >= 3) { + for (int i = 0; i < 50; i++) { + CRYPT_MD5Generate(digest, copy_len, digest); + } + } + FXSYS_memset(key, 0, keylen); + FXSYS_memcpy(key, digest, copy_len); +} + +} // namespace + +IPDF_SecurityHandler::~IPDF_SecurityHandler() {} + +CPDF_StandardSecurityHandler::CPDF_StandardSecurityHandler() { + m_Version = 0; + m_Revision = 0; + m_pParser = NULL; + m_pEncryptDict = NULL; + m_Permissions = 0; + m_Cipher = FXCIPHER_NONE; + m_KeyLen = 0; +} + +CPDF_StandardSecurityHandler::~CPDF_StandardSecurityHandler() {} + +CPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() { + return new CPDF_StandardCryptoHandler; +} + +FX_BOOL CPDF_StandardSecurityHandler::OnInit(CPDF_Parser* pParser, + CPDF_Dictionary* pEncryptDict) { + m_pParser = pParser; + if (!LoadDict(pEncryptDict)) { + return FALSE; + } + if (m_Cipher == FXCIPHER_NONE) { + return TRUE; + } + return CheckSecurity(m_KeyLen); +} +FX_BOOL CPDF_StandardSecurityHandler::CheckSecurity(int32_t key_len) { + CFX_ByteString password = m_pParser->GetPassword(); + if (CheckPassword(password, password.GetLength(), TRUE, m_EncryptKey, + key_len)) { + if (password.IsEmpty()) { + if (!CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey, + key_len)) { + return FALSE; + } + } + return TRUE; + } + return CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey, + key_len); +} +FX_DWORD CPDF_StandardSecurityHandler::GetPermissions() { + return m_Permissions; +} +static FX_BOOL _LoadCryptInfo(CPDF_Dictionary* pEncryptDict, + const CFX_ByteStringC& name, + int& cipher, + int& keylen) { + int Version = pEncryptDict->GetIntegerBy("V"); + cipher = FXCIPHER_RC4; + keylen = 0; + if (Version >= 4) { + CPDF_Dictionary* pCryptFilters = pEncryptDict->GetDictBy("CF"); + if (!pCryptFilters) { + return FALSE; + } + if (name == "Identity") { + cipher = FXCIPHER_NONE; + } else { + CPDF_Dictionary* pDefFilter = pCryptFilters->GetDictBy(name); + if (!pDefFilter) { + return FALSE; + } + int nKeyBits = 0; + if (Version == 4) { + nKeyBits = pDefFilter->GetIntegerBy("Length", 0); + if (nKeyBits == 0) { + nKeyBits = pEncryptDict->GetIntegerBy("Length", 128); + } + } else { + nKeyBits = pEncryptDict->GetIntegerBy("Length", 256); + } + if (nKeyBits < 40) { + nKeyBits *= 8; + } + keylen = nKeyBits / 8; + CFX_ByteString cipher_name = pDefFilter->GetStringBy("CFM"); + if (cipher_name == "AESV2" || cipher_name == "AESV3") { + cipher = FXCIPHER_AES; + } + } + } else { + keylen = Version > 1 ? pEncryptDict->GetIntegerBy("Length", 40) / 8 : 5; + } + if (keylen > 32 || keylen < 0) { + return FALSE; + } + return TRUE; +} + +FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict) { + m_pEncryptDict = pEncryptDict; + m_Version = pEncryptDict->GetIntegerBy("V"); + m_Revision = pEncryptDict->GetIntegerBy("R"); + m_Permissions = pEncryptDict->GetIntegerBy("P", -1); + if (m_Version < 4) { + return _LoadCryptInfo(pEncryptDict, CFX_ByteString(), m_Cipher, m_KeyLen); + } + CFX_ByteString stmf_name = pEncryptDict->GetStringBy("StmF"); + CFX_ByteString strf_name = pEncryptDict->GetStringBy("StrF"); + if (stmf_name != strf_name) { + return FALSE; + } + if (!_LoadCryptInfo(pEncryptDict, strf_name, m_Cipher, m_KeyLen)) { + return FALSE; + } + return TRUE; +} + +FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict, + FX_DWORD type, + int& cipher, + int& key_len) { + m_pEncryptDict = pEncryptDict; + m_Version = pEncryptDict->GetIntegerBy("V"); + m_Revision = pEncryptDict->GetIntegerBy("R"); + m_Permissions = pEncryptDict->GetIntegerBy("P", -1); + CFX_ByteString strf_name, stmf_name; + if (m_Version >= 4) { + stmf_name = pEncryptDict->GetStringBy("StmF"); + strf_name = pEncryptDict->GetStringBy("StrF"); + if (stmf_name != strf_name) { + return FALSE; + } + } + if (!_LoadCryptInfo(pEncryptDict, strf_name, cipher, key_len)) { + return FALSE; + } + m_Cipher = cipher; + m_KeyLen = key_len; + return TRUE; +} + +FX_BOOL CPDF_StandardSecurityHandler::GetCryptInfo(int& cipher, + const uint8_t*& buffer, + int& keylen) { + cipher = m_Cipher; + buffer = m_EncryptKey; + keylen = m_KeyLen; + return TRUE; +} +#define FX_GET_32WORD(n, b, i) \ + { \ + (n) = (FX_DWORD)( \ + ((uint64_t)(b)[(i)] << 24) | ((uint64_t)(b)[(i) + 1] << 16) | \ + ((uint64_t)(b)[(i) + 2] << 8) | ((uint64_t)(b)[(i) + 3])); \ + } +int BigOrder64BitsMod3(uint8_t* data) { + uint64_t ret = 0; + for (int i = 0; i < 4; ++i) { + FX_DWORD value; + FX_GET_32WORD(value, data, 4 * i); + ret <<= 32; + ret |= value; + ret %= 3; + } + return (int)ret; +} +void Revision6_Hash(const uint8_t* password, + FX_DWORD size, + const uint8_t* salt, + const uint8_t* vector, + uint8_t* hash) { + int iBlockSize = 32; + uint8_t sha[128]; + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, password, size); + CRYPT_SHA256Update(sha, salt, 8); + if (vector) { + CRYPT_SHA256Update(sha, vector, 48); + } + uint8_t digest[32]; + CRYPT_SHA256Finish(sha, digest); + CFX_ByteTextBuf buf; + uint8_t* input = digest; + uint8_t* key = input; + uint8_t* iv = input + 16; + uint8_t* E = buf.GetBuffer(); + int iBufLen = buf.GetLength(); + CFX_ByteTextBuf interDigest; + int i = 0; + uint8_t* aes = FX_Alloc(uint8_t, 2048); + while (i < 64 || i < E[iBufLen - 1] + 32) { + int iRoundSize = size + iBlockSize; + if (vector) { + iRoundSize += 48; + } + iBufLen = iRoundSize * 64; + buf.EstimateSize(iBufLen); + E = buf.GetBuffer(); + CFX_ByteTextBuf content; + for (int j = 0; j < 64; ++j) { + content.AppendBlock(password, size); + content.AppendBlock(input, iBlockSize); + if (vector) { + content.AppendBlock(vector, 48); + } + } + CRYPT_AESSetKey(aes, 16, key, 16, TRUE); + CRYPT_AESSetIV(aes, iv); + CRYPT_AESEncrypt(aes, E, content.GetBuffer(), iBufLen); + int iHash = 0; + switch (BigOrder64BitsMod3(E)) { + case 0: + iHash = 0; + iBlockSize = 32; + break; + case 1: + iHash = 1; + iBlockSize = 48; + break; + default: + iHash = 2; + iBlockSize = 64; + break; + } + interDigest.EstimateSize(iBlockSize); + input = interDigest.GetBuffer(); + if (iHash == 0) { + CRYPT_SHA256Generate(E, iBufLen, input); + } else if (iHash == 1) { + CRYPT_SHA384Generate(E, iBufLen, input); + } else if (iHash == 2) { + CRYPT_SHA512Generate(E, iBufLen, input); + } + key = input; + iv = input + 16; + ++i; + } + FX_Free(aes); + if (hash) { + FXSYS_memcpy(hash, input, 32); + } +} +FX_BOOL CPDF_StandardSecurityHandler::AES256_CheckPassword( + const uint8_t* password, + FX_DWORD size, + FX_BOOL bOwner, + uint8_t* key) { + CFX_ByteString okey = + m_pEncryptDict ? m_pEncryptDict->GetStringBy("O") : CFX_ByteString(); + if (okey.GetLength() < 48) { + return FALSE; + } + CFX_ByteString ukey = + m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString(); + if (ukey.GetLength() < 48) { + return FALSE; + } + const uint8_t* pkey = bOwner ? (const uint8_t*)okey : (const uint8_t*)ukey; + uint8_t sha[128]; + uint8_t digest[32]; + if (m_Revision >= 6) { + Revision6_Hash(password, size, (const uint8_t*)pkey + 32, + (bOwner ? (const uint8_t*)ukey : NULL), digest); + } else { + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, password, size); + CRYPT_SHA256Update(sha, pkey + 32, 8); + if (bOwner) { + CRYPT_SHA256Update(sha, ukey, 48); + } + CRYPT_SHA256Finish(sha, digest); + } + if (FXSYS_memcmp(digest, pkey, 32) != 0) { + return FALSE; + } + if (!key) { + return TRUE; + } + if (m_Revision >= 6) { + Revision6_Hash(password, size, (const uint8_t*)pkey + 40, + (bOwner ? (const uint8_t*)ukey : NULL), digest); + } else { + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, password, size); + CRYPT_SHA256Update(sha, pkey + 40, 8); + if (bOwner) { + CRYPT_SHA256Update(sha, ukey, 48); + } + CRYPT_SHA256Finish(sha, digest); + } + CFX_ByteString ekey = m_pEncryptDict + ? m_pEncryptDict->GetStringBy(bOwner ? "OE" : "UE") + : CFX_ByteString(); + if (ekey.GetLength() < 32) { + return FALSE; + } + uint8_t* aes = FX_Alloc(uint8_t, 2048); + CRYPT_AESSetKey(aes, 16, digest, 32, FALSE); + uint8_t iv[16]; + FXSYS_memset(iv, 0, 16); + CRYPT_AESSetIV(aes, iv); + CRYPT_AESDecrypt(aes, key, ekey, 32); + CRYPT_AESSetKey(aes, 16, key, 32, FALSE); + CRYPT_AESSetIV(aes, iv); + CFX_ByteString perms = m_pEncryptDict->GetStringBy("Perms"); + if (perms.IsEmpty()) { + return FALSE; + } + uint8_t perms_buf[16]; + FXSYS_memset(perms_buf, 0, sizeof(perms_buf)); + FX_DWORD copy_len = sizeof(perms_buf); + if (copy_len > (FX_DWORD)perms.GetLength()) { + copy_len = perms.GetLength(); + } + FXSYS_memcpy(perms_buf, (const uint8_t*)perms, copy_len); + uint8_t buf[16]; + CRYPT_AESDecrypt(aes, buf, perms_buf, 16); + FX_Free(aes); + if (buf[9] != 'a' || buf[10] != 'd' || buf[11] != 'b') { + return FALSE; + } + if (FXDWORD_GET_LSBFIRST(buf) != m_Permissions) { + return FALSE; + } + if ((buf[8] == 'T' && !IsMetadataEncrypted()) || + (buf[8] == 'F' && IsMetadataEncrypted())) { + return FALSE; + } + return TRUE; +} + +int CPDF_StandardSecurityHandler::CheckPassword(const uint8_t* password, + FX_DWORD size, + FX_BOOL bOwner, + uint8_t* key, + int32_t key_len) { + if (m_Revision >= 5) { + return AES256_CheckPassword(password, size, bOwner, key); + } + uint8_t keybuf[32]; + if (!key) { + key = keybuf; + } + if (bOwner) { + return CheckOwnerPassword(password, size, key, key_len); + } + return CheckUserPassword(password, size, FALSE, key, key_len) || + CheckUserPassword(password, size, TRUE, key, key_len); +} +FX_BOOL CPDF_StandardSecurityHandler::CheckUserPassword( + const uint8_t* password, + FX_DWORD pass_size, + FX_BOOL bIgnoreEncryptMeta, + uint8_t* key, + int32_t key_len) { + CalcEncryptKey(m_pEncryptDict, password, pass_size, key, key_len, + bIgnoreEncryptMeta, m_pParser->GetIDArray()); + CFX_ByteString ukey = + m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString(); + if (ukey.GetLength() < 16) { + return FALSE; + } + uint8_t ukeybuf[32]; + if (m_Revision == 2) { + FXSYS_memcpy(ukeybuf, defpasscode, 32); + CRYPT_ArcFourCryptBlock(ukeybuf, 32, key, key_len); + } else { + uint8_t test[32], tmpkey[32]; + FX_DWORD copy_len = sizeof(test); + if (copy_len > (FX_DWORD)ukey.GetLength()) { + copy_len = ukey.GetLength(); + } + FXSYS_memset(test, 0, sizeof(test)); + FXSYS_memset(tmpkey, 0, sizeof(tmpkey)); + FXSYS_memcpy(test, ukey.c_str(), copy_len); + for (int i = 19; i >= 0; i--) { + for (int j = 0; j < key_len; j++) { + tmpkey[j] = key[j] ^ i; + } + CRYPT_ArcFourCryptBlock(test, 32, tmpkey, key_len); + } + uint8_t md5[100]; + CRYPT_MD5Start(md5); + CRYPT_MD5Update(md5, defpasscode, 32); + CPDF_Array* pIdArray = m_pParser->GetIDArray(); + if (pIdArray) { + CFX_ByteString id = pIdArray->GetStringAt(0); + CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); + } + CRYPT_MD5Finish(md5, ukeybuf); + return FXSYS_memcmp(test, ukeybuf, 16) == 0; + } + if (FXSYS_memcmp((void*)ukey.c_str(), ukeybuf, 16) == 0) { + return TRUE; + } + return FALSE; +} +CFX_ByteString CPDF_StandardSecurityHandler::GetUserPassword( + const uint8_t* owner_pass, + FX_DWORD pass_size, + int32_t key_len) { + CFX_ByteString okey = m_pEncryptDict->GetStringBy("O"); + uint8_t passcode[32]; + FX_DWORD i; + for (i = 0; i < 32; i++) { + passcode[i] = i < pass_size ? owner_pass[i] : defpasscode[i - pass_size]; + } + uint8_t digest[16]; + CRYPT_MD5Generate(passcode, 32, digest); + if (m_Revision >= 3) { + for (int i = 0; i < 50; i++) { + CRYPT_MD5Generate(digest, 16, digest); + } + } + uint8_t enckey[32]; + FXSYS_memset(enckey, 0, sizeof(enckey)); + FX_DWORD copy_len = key_len; + if (copy_len > sizeof(digest)) { + copy_len = sizeof(digest); + } + FXSYS_memcpy(enckey, digest, copy_len); + int okeylen = okey.GetLength(); + if (okeylen > 32) { + okeylen = 32; + } + uint8_t okeybuf[64]; + FXSYS_memset(okeybuf, 0, sizeof(okeybuf)); + FXSYS_memcpy(okeybuf, okey.c_str(), okeylen); + if (m_Revision == 2) { + CRYPT_ArcFourCryptBlock(okeybuf, okeylen, enckey, key_len); + } else { + for (int i = 19; i >= 0; i--) { + uint8_t tempkey[32]; + FXSYS_memset(tempkey, 0, sizeof(tempkey)); + for (int j = 0; j < m_KeyLen; j++) { + tempkey[j] = enckey[j] ^ i; + } + CRYPT_ArcFourCryptBlock(okeybuf, okeylen, tempkey, key_len); + } + } + int len = 32; + while (len && defpasscode[len - 1] == okeybuf[len - 1]) { + len--; + } + return CFX_ByteString(okeybuf, len); +} +FX_BOOL CPDF_StandardSecurityHandler::CheckOwnerPassword( + const uint8_t* password, + FX_DWORD pass_size, + uint8_t* key, + int32_t key_len) { + CFX_ByteString user_pass = GetUserPassword(password, pass_size, key_len); + if (CheckUserPassword(user_pass, user_pass.GetLength(), FALSE, key, + key_len)) { + return TRUE; + } + return CheckUserPassword(user_pass, user_pass.GetLength(), TRUE, key, + key_len); +} +FX_BOOL CPDF_StandardSecurityHandler::IsMetadataEncrypted() { + return m_pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE); +} + +void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + const uint8_t* owner_pass, + FX_DWORD owner_size, + FX_BOOL bDefault, + FX_DWORD type) { + int cipher = 0, key_len = 0; + if (!LoadDict(pEncryptDict, type, cipher, key_len)) { + return; + } + if (bDefault && (!owner_pass || owner_size == 0)) { + owner_pass = user_pass; + owner_size = user_size; + } + if (m_Revision >= 5) { + int t = (int)time(NULL); + uint8_t sha[128]; + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, (uint8_t*)&t, sizeof t); + CRYPT_SHA256Update(sha, m_EncryptKey, 32); + CRYPT_SHA256Update(sha, (uint8_t*)"there", 5); + CRYPT_SHA256Finish(sha, m_EncryptKey); + AES256_SetPassword(pEncryptDict, user_pass, user_size, FALSE, m_EncryptKey); + if (bDefault) { + AES256_SetPassword(pEncryptDict, owner_pass, owner_size, TRUE, + m_EncryptKey); + AES256_SetPerms(pEncryptDict, m_Permissions, + pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE), + m_EncryptKey); + } + return; + } + if (bDefault) { + uint8_t passcode[32]; + FX_DWORD i; + for (i = 0; i < 32; i++) { + passcode[i] = + i < owner_size ? owner_pass[i] : defpasscode[i - owner_size]; + } + uint8_t digest[16]; + CRYPT_MD5Generate(passcode, 32, digest); + if (m_Revision >= 3) { + for (int i = 0; i < 50; i++) { + CRYPT_MD5Generate(digest, 16, digest); + } + } + uint8_t enckey[32]; + FXSYS_memcpy(enckey, digest, key_len); + for (i = 0; i < 32; i++) { + passcode[i] = i < user_size ? user_pass[i] : defpasscode[i - user_size]; + } + CRYPT_ArcFourCryptBlock(passcode, 32, enckey, key_len); + uint8_t tempkey[32]; + if (m_Revision >= 3) { + for (i = 1; i <= 19; i++) { + for (int j = 0; j < key_len; j++) { + tempkey[j] = enckey[j] ^ (uint8_t)i; + } + CRYPT_ArcFourCryptBlock(passcode, 32, tempkey, key_len); + } + } + pEncryptDict->SetAtString("O", CFX_ByteString(passcode, 32)); + } + CalcEncryptKey(m_pEncryptDict, (uint8_t*)user_pass, user_size, m_EncryptKey, + key_len, FALSE, pIdArray); + if (m_Revision < 3) { + uint8_t tempbuf[32]; + FXSYS_memcpy(tempbuf, defpasscode, 32); + CRYPT_ArcFourCryptBlock(tempbuf, 32, m_EncryptKey, key_len); + pEncryptDict->SetAtString("U", CFX_ByteString(tempbuf, 32)); + } else { + uint8_t md5[100]; + CRYPT_MD5Start(md5); + CRYPT_MD5Update(md5, defpasscode, 32); + if (pIdArray) { + CFX_ByteString id = pIdArray->GetStringAt(0); + CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); + } + uint8_t digest[32]; + CRYPT_MD5Finish(md5, digest); + CRYPT_ArcFourCryptBlock(digest, 16, m_EncryptKey, key_len); + uint8_t tempkey[32]; + for (int i = 1; i <= 19; i++) { + for (int j = 0; j < key_len; j++) { + tempkey[j] = m_EncryptKey[j] ^ (uint8_t)i; + } + CRYPT_ArcFourCryptBlock(digest, 16, tempkey, key_len); + } + CRYPT_MD5Generate(digest, 16, digest + 16); + pEncryptDict->SetAtString("U", CFX_ByteString(digest, 32)); + } +} +void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + const uint8_t* owner_pass, + FX_DWORD owner_size, + FX_DWORD type) { + OnCreate(pEncryptDict, pIdArray, user_pass, user_size, owner_pass, owner_size, + TRUE, type); +} +void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + FX_DWORD type) { + OnCreate(pEncryptDict, pIdArray, user_pass, user_size, NULL, 0, FALSE, type); +} +void CPDF_StandardSecurityHandler::AES256_SetPassword( + CPDF_Dictionary* pEncryptDict, + const uint8_t* password, + FX_DWORD size, + FX_BOOL bOwner, + const uint8_t* key) { + uint8_t sha[128]; + CRYPT_SHA1Start(sha); + CRYPT_SHA1Update(sha, key, 32); + CRYPT_SHA1Update(sha, (uint8_t*)"hello", 5); + uint8_t digest[20]; + CRYPT_SHA1Finish(sha, digest); + CFX_ByteString ukey = pEncryptDict->GetStringBy("U"); + uint8_t digest1[48]; + if (m_Revision >= 6) { + Revision6_Hash(password, size, digest, + (bOwner ? (const uint8_t*)ukey : NULL), digest1); + } else { + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, password, size); + CRYPT_SHA256Update(sha, digest, 8); + if (bOwner) { + CRYPT_SHA256Update(sha, ukey, ukey.GetLength()); + } + CRYPT_SHA256Finish(sha, digest1); + } + FXSYS_memcpy(digest1 + 32, digest, 16); + pEncryptDict->SetAtString(bOwner ? "O" : "U", CFX_ByteString(digest1, 48)); + if (m_Revision >= 6) { + Revision6_Hash(password, size, digest + 8, + (bOwner ? (const uint8_t*)ukey : NULL), digest1); + } else { + CRYPT_SHA256Start(sha); + CRYPT_SHA256Update(sha, password, size); + CRYPT_SHA256Update(sha, digest + 8, 8); + if (bOwner) { + CRYPT_SHA256Update(sha, ukey, ukey.GetLength()); + } + CRYPT_SHA256Finish(sha, digest1); + } + uint8_t* aes = FX_Alloc(uint8_t, 2048); + CRYPT_AESSetKey(aes, 16, digest1, 32, TRUE); + uint8_t iv[16]; + FXSYS_memset(iv, 0, 16); + CRYPT_AESSetIV(aes, iv); + CRYPT_AESEncrypt(aes, digest1, key, 32); + FX_Free(aes); + pEncryptDict->SetAtString(bOwner ? "OE" : "UE", CFX_ByteString(digest1, 32)); +} +void CPDF_StandardSecurityHandler::AES256_SetPerms( + CPDF_Dictionary* pEncryptDict, + FX_DWORD permissions, + FX_BOOL bEncryptMetadata, + const uint8_t* key) { + uint8_t buf[16]; + buf[0] = (uint8_t)permissions; + buf[1] = (uint8_t)(permissions >> 8); + buf[2] = (uint8_t)(permissions >> 16); + buf[3] = (uint8_t)(permissions >> 24); + buf[4] = 0xff; + buf[5] = 0xff; + buf[6] = 0xff; + buf[7] = 0xff; + buf[8] = bEncryptMetadata ? 'T' : 'F'; + buf[9] = 'a'; + buf[10] = 'd'; + buf[11] = 'b'; + uint8_t* aes = FX_Alloc(uint8_t, 2048); + CRYPT_AESSetKey(aes, 16, key, 32, TRUE); + uint8_t iv[16], buf1[16]; + FXSYS_memset(iv, 0, 16); + CRYPT_AESSetIV(aes, iv); + CRYPT_AESEncrypt(aes, buf1, buf, 16); + FX_Free(aes); + pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16)); +} diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h new file mode 100644 index 0000000000..27aeaa8bc0 --- /dev/null +++ b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h @@ -0,0 +1,105 @@ +// Copyright 2016 PDFium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com + +#ifndef CORE_SRC_FPDFAPI_FPDF_PARSER_CPDF_STANDARD_SECURITY_HANDLER_H_ +#define CORE_SRC_FPDFAPI_FPDF_PARSER_CPDF_STANDARD_SECURITY_HANDLER_H_ + +#include "core/include/fpdfapi/ipdf_security_handler.h" +#include "core/include/fxcrt/fx_string.h" +#include "core/include/fxcrt/fx_system.h" + +class CPDF_Array; + +#define PDF_ENCRYPT_CONTENT 0 + +class CPDF_StandardSecurityHandler : public IPDF_SecurityHandler { + public: + CPDF_StandardSecurityHandler(); + ~CPDF_StandardSecurityHandler() override; + + // IPDF_SecurityHandler: + FX_BOOL OnInit(CPDF_Parser* pParser, CPDF_Dictionary* pEncryptDict) override; + FX_DWORD GetPermissions() override; + FX_BOOL GetCryptInfo(int& cipher, + const uint8_t*& buffer, + int& keylen) override; + FX_BOOL IsMetadataEncrypted() override; + CPDF_CryptoHandler* CreateCryptoHandler() override; + + void OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + const uint8_t* owner_pass, + FX_DWORD owner_size, + FX_DWORD type = PDF_ENCRYPT_CONTENT); + + void OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + FX_DWORD type = PDF_ENCRYPT_CONTENT); + + CFX_ByteString GetUserPassword(const uint8_t* owner_pass, + FX_DWORD pass_size, + int32_t key_len); + int CheckPassword(const uint8_t* password, + FX_DWORD pass_size, + FX_BOOL bOwner, + uint8_t* key, + int key_len); + + private: + FX_BOOL LoadDict(CPDF_Dictionary* pEncryptDict); + FX_BOOL LoadDict(CPDF_Dictionary* pEncryptDict, + FX_DWORD type, + int& cipher, + int& key_len); + + FX_BOOL CheckUserPassword(const uint8_t* password, + FX_DWORD pass_size, + FX_BOOL bIgnoreEncryptMeta, + uint8_t* key, + int32_t key_len); + + FX_BOOL CheckOwnerPassword(const uint8_t* password, + FX_DWORD pass_size, + uint8_t* key, + int32_t key_len); + FX_BOOL AES256_CheckPassword(const uint8_t* password, + FX_DWORD size, + FX_BOOL bOwner, + uint8_t* key); + void AES256_SetPassword(CPDF_Dictionary* pEncryptDict, + const uint8_t* password, + FX_DWORD size, + FX_BOOL bOwner, + const uint8_t* key); + void AES256_SetPerms(CPDF_Dictionary* pEncryptDict, + FX_DWORD permission, + FX_BOOL bEncryptMetadata, + const uint8_t* key); + void OnCreate(CPDF_Dictionary* pEncryptDict, + CPDF_Array* pIdArray, + const uint8_t* user_pass, + FX_DWORD user_size, + const uint8_t* owner_pass, + FX_DWORD owner_size, + FX_BOOL bDefault, + FX_DWORD type); + FX_BOOL CheckSecurity(int32_t key_len); + + int m_Version; + int m_Revision; + CPDF_Parser* m_pParser; + CPDF_Dictionary* m_pEncryptDict; + FX_DWORD m_Permissions; + int m_Cipher; + uint8_t m_EncryptKey[32]; + int m_KeyLen; +}; + +#endif // CORE_SRC_FPDFAPI_FPDF_PARSER_CPDF_STANDARD_SECURITY_HANDLER_H_ diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp index 9fe534ec35..acf7e11dca 100644 --- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp +++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp @@ -10,59 +10,9 @@ #include "core/include/fpdfapi/cpdf_parser.h" #include "core/include/fpdfapi/cpdf_simple_parser.h" +#include "core/include/fpdfapi/ipdf_security_handler.h" #include "core/include/fdrm/fx_crypt.h" -const uint8_t defpasscode[32] = { - 0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, - 0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, - 0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a}; -void CalcEncryptKey(CPDF_Dictionary* pEncrypt, - const uint8_t* password, - FX_DWORD pass_size, - uint8_t* key, - int keylen, - FX_BOOL bIgnoreMeta, - CPDF_Array* pIdArray) { - int revision = pEncrypt->GetIntegerBy("R"); - uint8_t passcode[32]; - for (FX_DWORD i = 0; i < 32; i++) { - passcode[i] = i < pass_size ? password[i] : defpasscode[i - pass_size]; - } - uint8_t md5[100]; - CRYPT_MD5Start(md5); - CRYPT_MD5Update(md5, passcode, 32); - CFX_ByteString okey = pEncrypt->GetStringBy("O"); - CRYPT_MD5Update(md5, (uint8_t*)okey.c_str(), okey.GetLength()); - FX_DWORD perm = pEncrypt->GetIntegerBy("P"); - CRYPT_MD5Update(md5, (uint8_t*)&perm, 4); - if (pIdArray) { - CFX_ByteString id = pIdArray->GetStringAt(0); - CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); - } - if (!bIgnoreMeta && revision >= 3 && - !pEncrypt->GetIntegerBy("EncryptMetadata", 1)) { - FX_DWORD tag = (FX_DWORD)-1; - CRYPT_MD5Update(md5, (uint8_t*)&tag, 4); - } - uint8_t digest[16]; - CRYPT_MD5Finish(md5, digest); - FX_DWORD copy_len = keylen; - if (copy_len > sizeof(digest)) { - copy_len = sizeof(digest); - } - if (revision >= 3) { - for (int i = 0; i < 50; i++) { - CRYPT_MD5Generate(digest, copy_len, digest); - } - } - FXSYS_memset(key, 0, keylen); - FXSYS_memcpy(key, digest, copy_len); -} - -CPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() { - return new CPDF_StandardCryptoHandler; -} - struct PDF_CRYPTOITEM { int32_t m_Cipher; int32_t m_KeyLen; @@ -70,648 +20,6 @@ struct PDF_CRYPTOITEM { CPDF_StandardCryptoHandler* m_pCryptoHandler; }; -CPDF_StandardSecurityHandler::CPDF_StandardSecurityHandler() { - m_Version = 0; - m_Revision = 0; - m_pParser = NULL; - m_pEncryptDict = NULL; - m_Permissions = 0; - m_Cipher = FXCIPHER_NONE; - m_KeyLen = 0; -} - -CPDF_StandardSecurityHandler::~CPDF_StandardSecurityHandler() {} -FX_BOOL CPDF_StandardSecurityHandler::OnInit(CPDF_Parser* pParser, - CPDF_Dictionary* pEncryptDict) { - m_pParser = pParser; - if (!LoadDict(pEncryptDict)) { - return FALSE; - } - if (m_Cipher == FXCIPHER_NONE) { - return TRUE; - } - return CheckSecurity(m_KeyLen); -} -FX_BOOL CPDF_StandardSecurityHandler::CheckSecurity(int32_t key_len) { - CFX_ByteString password = m_pParser->GetPassword(); - if (CheckPassword(password, password.GetLength(), TRUE, m_EncryptKey, - key_len)) { - if (password.IsEmpty()) { - if (!CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey, - key_len)) { - return FALSE; - } - } - return TRUE; - } - return CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey, - key_len); -} -FX_DWORD CPDF_StandardSecurityHandler::GetPermissions() { - return m_Permissions; -} -static FX_BOOL _LoadCryptInfo(CPDF_Dictionary* pEncryptDict, - const CFX_ByteStringC& name, - int& cipher, - int& keylen) { - int Version = pEncryptDict->GetIntegerBy("V"); - cipher = FXCIPHER_RC4; - keylen = 0; - if (Version >= 4) { - CPDF_Dictionary* pCryptFilters = pEncryptDict->GetDictBy("CF"); - if (!pCryptFilters) { - return FALSE; - } - if (name == "Identity") { - cipher = FXCIPHER_NONE; - } else { - CPDF_Dictionary* pDefFilter = pCryptFilters->GetDictBy(name); - if (!pDefFilter) { - return FALSE; - } - int nKeyBits = 0; - if (Version == 4) { - nKeyBits = pDefFilter->GetIntegerBy("Length", 0); - if (nKeyBits == 0) { - nKeyBits = pEncryptDict->GetIntegerBy("Length", 128); - } - } else { - nKeyBits = pEncryptDict->GetIntegerBy("Length", 256); - } - if (nKeyBits < 40) { - nKeyBits *= 8; - } - keylen = nKeyBits / 8; - CFX_ByteString cipher_name = pDefFilter->GetStringBy("CFM"); - if (cipher_name == "AESV2" || cipher_name == "AESV3") { - cipher = FXCIPHER_AES; - } - } - } else { - keylen = Version > 1 ? pEncryptDict->GetIntegerBy("Length", 40) / 8 : 5; - } - if (keylen > 32 || keylen < 0) { - return FALSE; - } - return TRUE; -} - -FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict) { - m_pEncryptDict = pEncryptDict; - m_Version = pEncryptDict->GetIntegerBy("V"); - m_Revision = pEncryptDict->GetIntegerBy("R"); - m_Permissions = pEncryptDict->GetIntegerBy("P", -1); - if (m_Version < 4) { - return _LoadCryptInfo(pEncryptDict, CFX_ByteString(), m_Cipher, m_KeyLen); - } - CFX_ByteString stmf_name = pEncryptDict->GetStringBy("StmF"); - CFX_ByteString strf_name = pEncryptDict->GetStringBy("StrF"); - if (stmf_name != strf_name) { - return FALSE; - } - if (!_LoadCryptInfo(pEncryptDict, strf_name, m_Cipher, m_KeyLen)) { - return FALSE; - } - return TRUE; -} - -FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict, - FX_DWORD type, - int& cipher, - int& key_len) { - m_pEncryptDict = pEncryptDict; - m_Version = pEncryptDict->GetIntegerBy("V"); - m_Revision = pEncryptDict->GetIntegerBy("R"); - m_Permissions = pEncryptDict->GetIntegerBy("P", -1); - CFX_ByteString strf_name, stmf_name; - if (m_Version >= 4) { - stmf_name = pEncryptDict->GetStringBy("StmF"); - strf_name = pEncryptDict->GetStringBy("StrF"); - if (stmf_name != strf_name) { - return FALSE; - } - } - if (!_LoadCryptInfo(pEncryptDict, strf_name, cipher, key_len)) { - return FALSE; - } - m_Cipher = cipher; - m_KeyLen = key_len; - return TRUE; -} - -FX_BOOL CPDF_StandardSecurityHandler::GetCryptInfo(int& cipher, - const uint8_t*& buffer, - int& keylen) { - cipher = m_Cipher; - buffer = m_EncryptKey; - keylen = m_KeyLen; - return TRUE; -} -#define FX_GET_32WORD(n, b, i) \ - { \ - (n) = (FX_DWORD)( \ - ((uint64_t)(b)[(i)] << 24) | ((uint64_t)(b)[(i) + 1] << 16) | \ - ((uint64_t)(b)[(i) + 2] << 8) | ((uint64_t)(b)[(i) + 3])); \ - } -int BigOrder64BitsMod3(uint8_t* data) { - uint64_t ret = 0; - for (int i = 0; i < 4; ++i) { - FX_DWORD value; - FX_GET_32WORD(value, data, 4 * i); - ret <<= 32; - ret |= value; - ret %= 3; - } - return (int)ret; -} -void Revision6_Hash(const uint8_t* password, - FX_DWORD size, - const uint8_t* salt, - const uint8_t* vector, - uint8_t* hash) { - int iBlockSize = 32; - uint8_t sha[128]; - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, password, size); - CRYPT_SHA256Update(sha, salt, 8); - if (vector) { - CRYPT_SHA256Update(sha, vector, 48); - } - uint8_t digest[32]; - CRYPT_SHA256Finish(sha, digest); - CFX_ByteTextBuf buf; - uint8_t* input = digest; - uint8_t* key = input; - uint8_t* iv = input + 16; - uint8_t* E = buf.GetBuffer(); - int iBufLen = buf.GetLength(); - CFX_ByteTextBuf interDigest; - int i = 0; - uint8_t* aes = FX_Alloc(uint8_t, 2048); - while (i < 64 || i < E[iBufLen - 1] + 32) { - int iRoundSize = size + iBlockSize; - if (vector) { - iRoundSize += 48; - } - iBufLen = iRoundSize * 64; - buf.EstimateSize(iBufLen); - E = buf.GetBuffer(); - CFX_ByteTextBuf content; - for (int j = 0; j < 64; ++j) { - content.AppendBlock(password, size); - content.AppendBlock(input, iBlockSize); - if (vector) { - content.AppendBlock(vector, 48); - } - } - CRYPT_AESSetKey(aes, 16, key, 16, TRUE); - CRYPT_AESSetIV(aes, iv); - CRYPT_AESEncrypt(aes, E, content.GetBuffer(), iBufLen); - int iHash = 0; - switch (BigOrder64BitsMod3(E)) { - case 0: - iHash = 0; - iBlockSize = 32; - break; - case 1: - iHash = 1; - iBlockSize = 48; - break; - default: - iHash = 2; - iBlockSize = 64; - break; - } - interDigest.EstimateSize(iBlockSize); - input = interDigest.GetBuffer(); - if (iHash == 0) { - CRYPT_SHA256Generate(E, iBufLen, input); - } else if (iHash == 1) { - CRYPT_SHA384Generate(E, iBufLen, input); - } else if (iHash == 2) { - CRYPT_SHA512Generate(E, iBufLen, input); - } - key = input; - iv = input + 16; - ++i; - } - FX_Free(aes); - if (hash) { - FXSYS_memcpy(hash, input, 32); - } -} -FX_BOOL CPDF_StandardSecurityHandler::AES256_CheckPassword( - const uint8_t* password, - FX_DWORD size, - FX_BOOL bOwner, - uint8_t* key) { - CFX_ByteString okey = - m_pEncryptDict ? m_pEncryptDict->GetStringBy("O") : CFX_ByteString(); - if (okey.GetLength() < 48) { - return FALSE; - } - CFX_ByteString ukey = - m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString(); - if (ukey.GetLength() < 48) { - return FALSE; - } - const uint8_t* pkey = bOwner ? (const uint8_t*)okey : (const uint8_t*)ukey; - uint8_t sha[128]; - uint8_t digest[32]; - if (m_Revision >= 6) { - Revision6_Hash(password, size, (const uint8_t*)pkey + 32, - (bOwner ? (const uint8_t*)ukey : NULL), digest); - } else { - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, password, size); - CRYPT_SHA256Update(sha, pkey + 32, 8); - if (bOwner) { - CRYPT_SHA256Update(sha, ukey, 48); - } - CRYPT_SHA256Finish(sha, digest); - } - if (FXSYS_memcmp(digest, pkey, 32) != 0) { - return FALSE; - } - if (!key) { - return TRUE; - } - if (m_Revision >= 6) { - Revision6_Hash(password, size, (const uint8_t*)pkey + 40, - (bOwner ? (const uint8_t*)ukey : NULL), digest); - } else { - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, password, size); - CRYPT_SHA256Update(sha, pkey + 40, 8); - if (bOwner) { - CRYPT_SHA256Update(sha, ukey, 48); - } - CRYPT_SHA256Finish(sha, digest); - } - CFX_ByteString ekey = m_pEncryptDict - ? m_pEncryptDict->GetStringBy(bOwner ? "OE" : "UE") - : CFX_ByteString(); - if (ekey.GetLength() < 32) { - return FALSE; - } - uint8_t* aes = FX_Alloc(uint8_t, 2048); - CRYPT_AESSetKey(aes, 16, digest, 32, FALSE); - uint8_t iv[16]; - FXSYS_memset(iv, 0, 16); - CRYPT_AESSetIV(aes, iv); - CRYPT_AESDecrypt(aes, key, ekey, 32); - CRYPT_AESSetKey(aes, 16, key, 32, FALSE); - CRYPT_AESSetIV(aes, iv); - CFX_ByteString perms = m_pEncryptDict->GetStringBy("Perms"); - if (perms.IsEmpty()) { - return FALSE; - } - uint8_t perms_buf[16]; - FXSYS_memset(perms_buf, 0, sizeof(perms_buf)); - FX_DWORD copy_len = sizeof(perms_buf); - if (copy_len > (FX_DWORD)perms.GetLength()) { - copy_len = perms.GetLength(); - } - FXSYS_memcpy(perms_buf, (const uint8_t*)perms, copy_len); - uint8_t buf[16]; - CRYPT_AESDecrypt(aes, buf, perms_buf, 16); - FX_Free(aes); - if (buf[9] != 'a' || buf[10] != 'd' || buf[11] != 'b') { - return FALSE; - } - if (FXDWORD_GET_LSBFIRST(buf) != m_Permissions) { - return FALSE; - } - if ((buf[8] == 'T' && !IsMetadataEncrypted()) || - (buf[8] == 'F' && IsMetadataEncrypted())) { - return FALSE; - } - return TRUE; -} - -int CPDF_StandardSecurityHandler::CheckPassword(const uint8_t* password, - FX_DWORD size, - FX_BOOL bOwner, - uint8_t* key, - int32_t key_len) { - if (m_Revision >= 5) { - return AES256_CheckPassword(password, size, bOwner, key); - } - uint8_t keybuf[32]; - if (!key) { - key = keybuf; - } - if (bOwner) { - return CheckOwnerPassword(password, size, key, key_len); - } - return CheckUserPassword(password, size, FALSE, key, key_len) || - CheckUserPassword(password, size, TRUE, key, key_len); -} -FX_BOOL CPDF_StandardSecurityHandler::CheckUserPassword( - const uint8_t* password, - FX_DWORD pass_size, - FX_BOOL bIgnoreEncryptMeta, - uint8_t* key, - int32_t key_len) { - CalcEncryptKey(m_pEncryptDict, password, pass_size, key, key_len, - bIgnoreEncryptMeta, m_pParser->GetIDArray()); - CFX_ByteString ukey = - m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString(); - if (ukey.GetLength() < 16) { - return FALSE; - } - uint8_t ukeybuf[32]; - if (m_Revision == 2) { - FXSYS_memcpy(ukeybuf, defpasscode, 32); - CRYPT_ArcFourCryptBlock(ukeybuf, 32, key, key_len); - } else { - uint8_t test[32], tmpkey[32]; - FX_DWORD copy_len = sizeof(test); - if (copy_len > (FX_DWORD)ukey.GetLength()) { - copy_len = ukey.GetLength(); - } - FXSYS_memset(test, 0, sizeof(test)); - FXSYS_memset(tmpkey, 0, sizeof(tmpkey)); - FXSYS_memcpy(test, ukey.c_str(), copy_len); - for (int i = 19; i >= 0; i--) { - for (int j = 0; j < key_len; j++) { - tmpkey[j] = key[j] ^ i; - } - CRYPT_ArcFourCryptBlock(test, 32, tmpkey, key_len); - } - uint8_t md5[100]; - CRYPT_MD5Start(md5); - CRYPT_MD5Update(md5, defpasscode, 32); - CPDF_Array* pIdArray = m_pParser->GetIDArray(); - if (pIdArray) { - CFX_ByteString id = pIdArray->GetStringAt(0); - CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); - } - CRYPT_MD5Finish(md5, ukeybuf); - return FXSYS_memcmp(test, ukeybuf, 16) == 0; - } - if (FXSYS_memcmp((void*)ukey.c_str(), ukeybuf, 16) == 0) { - return TRUE; - } - return FALSE; -} -CFX_ByteString CPDF_StandardSecurityHandler::GetUserPassword( - const uint8_t* owner_pass, - FX_DWORD pass_size, - int32_t key_len) { - CFX_ByteString okey = m_pEncryptDict->GetStringBy("O"); - uint8_t passcode[32]; - FX_DWORD i; - for (i = 0; i < 32; i++) { - passcode[i] = i < pass_size ? owner_pass[i] : defpasscode[i - pass_size]; - } - uint8_t digest[16]; - CRYPT_MD5Generate(passcode, 32, digest); - if (m_Revision >= 3) { - for (int i = 0; i < 50; i++) { - CRYPT_MD5Generate(digest, 16, digest); - } - } - uint8_t enckey[32]; - FXSYS_memset(enckey, 0, sizeof(enckey)); - FX_DWORD copy_len = key_len; - if (copy_len > sizeof(digest)) { - copy_len = sizeof(digest); - } - FXSYS_memcpy(enckey, digest, copy_len); - int okeylen = okey.GetLength(); - if (okeylen > 32) { - okeylen = 32; - } - uint8_t okeybuf[64]; - FXSYS_memset(okeybuf, 0, sizeof(okeybuf)); - FXSYS_memcpy(okeybuf, okey.c_str(), okeylen); - if (m_Revision == 2) { - CRYPT_ArcFourCryptBlock(okeybuf, okeylen, enckey, key_len); - } else { - for (int i = 19; i >= 0; i--) { - uint8_t tempkey[32]; - FXSYS_memset(tempkey, 0, sizeof(tempkey)); - for (int j = 0; j < m_KeyLen; j++) { - tempkey[j] = enckey[j] ^ i; - } - CRYPT_ArcFourCryptBlock(okeybuf, okeylen, tempkey, key_len); - } - } - int len = 32; - while (len && defpasscode[len - 1] == okeybuf[len - 1]) { - len--; - } - return CFX_ByteString(okeybuf, len); -} -FX_BOOL CPDF_StandardSecurityHandler::CheckOwnerPassword( - const uint8_t* password, - FX_DWORD pass_size, - uint8_t* key, - int32_t key_len) { - CFX_ByteString user_pass = GetUserPassword(password, pass_size, key_len); - if (CheckUserPassword(user_pass, user_pass.GetLength(), FALSE, key, - key_len)) { - return TRUE; - } - return CheckUserPassword(user_pass, user_pass.GetLength(), TRUE, key, - key_len); -} -FX_BOOL CPDF_StandardSecurityHandler::IsMetadataEncrypted() { - return m_pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE); -} - -IPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler() { - return new CPDF_StandardSecurityHandler; -} - -void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - const uint8_t* owner_pass, - FX_DWORD owner_size, - FX_BOOL bDefault, - FX_DWORD type) { - int cipher = 0, key_len = 0; - if (!LoadDict(pEncryptDict, type, cipher, key_len)) { - return; - } - if (bDefault && (!owner_pass || owner_size == 0)) { - owner_pass = user_pass; - owner_size = user_size; - } - if (m_Revision >= 5) { - int t = (int)time(NULL); - uint8_t sha[128]; - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, (uint8_t*)&t, sizeof t); - CRYPT_SHA256Update(sha, m_EncryptKey, 32); - CRYPT_SHA256Update(sha, (uint8_t*)"there", 5); - CRYPT_SHA256Finish(sha, m_EncryptKey); - AES256_SetPassword(pEncryptDict, user_pass, user_size, FALSE, m_EncryptKey); - if (bDefault) { - AES256_SetPassword(pEncryptDict, owner_pass, owner_size, TRUE, - m_EncryptKey); - AES256_SetPerms(pEncryptDict, m_Permissions, - pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE), - m_EncryptKey); - } - return; - } - if (bDefault) { - uint8_t passcode[32]; - FX_DWORD i; - for (i = 0; i < 32; i++) { - passcode[i] = - i < owner_size ? owner_pass[i] : defpasscode[i - owner_size]; - } - uint8_t digest[16]; - CRYPT_MD5Generate(passcode, 32, digest); - if (m_Revision >= 3) { - for (int i = 0; i < 50; i++) { - CRYPT_MD5Generate(digest, 16, digest); - } - } - uint8_t enckey[32]; - FXSYS_memcpy(enckey, digest, key_len); - for (i = 0; i < 32; i++) { - passcode[i] = i < user_size ? user_pass[i] : defpasscode[i - user_size]; - } - CRYPT_ArcFourCryptBlock(passcode, 32, enckey, key_len); - uint8_t tempkey[32]; - if (m_Revision >= 3) { - for (i = 1; i <= 19; i++) { - for (int j = 0; j < key_len; j++) { - tempkey[j] = enckey[j] ^ (uint8_t)i; - } - CRYPT_ArcFourCryptBlock(passcode, 32, tempkey, key_len); - } - } - pEncryptDict->SetAtString("O", CFX_ByteString(passcode, 32)); - } - CalcEncryptKey(m_pEncryptDict, (uint8_t*)user_pass, user_size, m_EncryptKey, - key_len, FALSE, pIdArray); - if (m_Revision < 3) { - uint8_t tempbuf[32]; - FXSYS_memcpy(tempbuf, defpasscode, 32); - CRYPT_ArcFourCryptBlock(tempbuf, 32, m_EncryptKey, key_len); - pEncryptDict->SetAtString("U", CFX_ByteString(tempbuf, 32)); - } else { - uint8_t md5[100]; - CRYPT_MD5Start(md5); - CRYPT_MD5Update(md5, defpasscode, 32); - if (pIdArray) { - CFX_ByteString id = pIdArray->GetStringAt(0); - CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength()); - } - uint8_t digest[32]; - CRYPT_MD5Finish(md5, digest); - CRYPT_ArcFourCryptBlock(digest, 16, m_EncryptKey, key_len); - uint8_t tempkey[32]; - for (int i = 1; i <= 19; i++) { - for (int j = 0; j < key_len; j++) { - tempkey[j] = m_EncryptKey[j] ^ (uint8_t)i; - } - CRYPT_ArcFourCryptBlock(digest, 16, tempkey, key_len); - } - CRYPT_MD5Generate(digest, 16, digest + 16); - pEncryptDict->SetAtString("U", CFX_ByteString(digest, 32)); - } -} -void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - const uint8_t* owner_pass, - FX_DWORD owner_size, - FX_DWORD type) { - OnCreate(pEncryptDict, pIdArray, user_pass, user_size, owner_pass, owner_size, - TRUE, type); -} -void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict, - CPDF_Array* pIdArray, - const uint8_t* user_pass, - FX_DWORD user_size, - FX_DWORD type) { - OnCreate(pEncryptDict, pIdArray, user_pass, user_size, NULL, 0, FALSE, type); -} -void CPDF_StandardSecurityHandler::AES256_SetPassword( - CPDF_Dictionary* pEncryptDict, - const uint8_t* password, - FX_DWORD size, - FX_BOOL bOwner, - const uint8_t* key) { - uint8_t sha[128]; - CRYPT_SHA1Start(sha); - CRYPT_SHA1Update(sha, key, 32); - CRYPT_SHA1Update(sha, (uint8_t*)"hello", 5); - uint8_t digest[20]; - CRYPT_SHA1Finish(sha, digest); - CFX_ByteString ukey = pEncryptDict->GetStringBy("U"); - uint8_t digest1[48]; - if (m_Revision >= 6) { - Revision6_Hash(password, size, digest, - (bOwner ? (const uint8_t*)ukey : NULL), digest1); - } else { - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, password, size); - CRYPT_SHA256Update(sha, digest, 8); - if (bOwner) { - CRYPT_SHA256Update(sha, ukey, ukey.GetLength()); - } - CRYPT_SHA256Finish(sha, digest1); - } - FXSYS_memcpy(digest1 + 32, digest, 16); - pEncryptDict->SetAtString(bOwner ? "O" : "U", CFX_ByteString(digest1, 48)); - if (m_Revision >= 6) { - Revision6_Hash(password, size, digest + 8, - (bOwner ? (const uint8_t*)ukey : NULL), digest1); - } else { - CRYPT_SHA256Start(sha); - CRYPT_SHA256Update(sha, password, size); - CRYPT_SHA256Update(sha, digest + 8, 8); - if (bOwner) { - CRYPT_SHA256Update(sha, ukey, ukey.GetLength()); - } - CRYPT_SHA256Finish(sha, digest1); - } - uint8_t* aes = FX_Alloc(uint8_t, 2048); - CRYPT_AESSetKey(aes, 16, digest1, 32, TRUE); - uint8_t iv[16]; - FXSYS_memset(iv, 0, 16); - CRYPT_AESSetIV(aes, iv); - CRYPT_AESEncrypt(aes, digest1, key, 32); - FX_Free(aes); - pEncryptDict->SetAtString(bOwner ? "OE" : "UE", CFX_ByteString(digest1, 32)); -} -void CPDF_StandardSecurityHandler::AES256_SetPerms( - CPDF_Dictionary* pEncryptDict, - FX_DWORD permissions, - FX_BOOL bEncryptMetadata, - const uint8_t* key) { - uint8_t buf[16]; - buf[0] = (uint8_t)permissions; - buf[1] = (uint8_t)(permissions >> 8); - buf[2] = (uint8_t)(permissions >> 16); - buf[3] = (uint8_t)(permissions >> 24); - buf[4] = 0xff; - buf[5] = 0xff; - buf[6] = 0xff; - buf[7] = 0xff; - buf[8] = bEncryptMetadata ? 'T' : 'F'; - buf[9] = 'a'; - buf[10] = 'd'; - buf[11] = 'b'; - uint8_t* aes = FX_Alloc(uint8_t, 2048); - CRYPT_AESSetKey(aes, 16, key, 32, TRUE); - uint8_t iv[16], buf1[16]; - FXSYS_memset(iv, 0, 16); - CRYPT_AESSetIV(aes, iv); - CRYPT_AESEncrypt(aes, buf1, buf, 16); - FX_Free(aes); - pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16)); -} void CPDF_StandardCryptoHandler::CryptBlock(FX_BOOL bEncrypt, FX_DWORD objnum, FX_DWORD gennum, -- cgit v1.2.3