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Diffstat (limited to 'stoc/source/security/permissions.cxx')
| -rw-r--r-- | stoc/source/security/permissions.cxx | 604 |
1 files changed, 604 insertions, 0 deletions
diff --git a/stoc/source/security/permissions.cxx b/stoc/source/security/permissions.cxx new file mode 100644 index 000000000..1799f9c8c --- /dev/null +++ b/stoc/source/security/permissions.cxx @@ -0,0 +1,604 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + + +#include <vector> + +#include <osl/process.h> +#include <osl/socket.hxx> +#include <osl/mutex.hxx> + +#include <rtl/string.hxx> +#include <rtl/ustrbuf.hxx> +#include <sal/log.hxx> +#include <o3tl/string_view.hxx> + +#include <com/sun/star/security/RuntimePermission.hpp> +#include <com/sun/star/security/AllPermission.hpp> +#include <com/sun/star/io/FilePermission.hpp> +#include <com/sun/star/connection/SocketPermission.hpp> +#include <com/sun/star/security/AccessControlException.hpp> +#include <com/sun/star/uno/Sequence.hxx> + +#include "permissions.h" + +using namespace ::std; +using namespace ::osl; +using namespace ::com::sun::star; +using namespace css::uno; + +namespace stoc_sec +{ + + +static sal_Int32 makeMask( + OUString const & items, char const * const * strings ) +{ + sal_Int32 mask = 0; + + sal_Int32 n = 0; + do + { + OUString item( o3tl::trim(o3tl::getToken(items, 0, ',', n )) ); + if ( item.isEmpty()) + continue; + sal_Int32 nPos = 0; + while (strings[ nPos ]) + { + if (item.equalsAscii( strings[ nPos ] )) + { + mask |= (0x80000000 >> nPos); + break; + } + ++nPos; + } +#if OSL_DEBUG_LEVEL > 0 + if (! strings[ nPos ]) + { + SAL_WARN("stoc", "ignoring unknown socket action: " << item ); + } +#endif + } + while (n >= 0); // all items + return mask; +} + +static OUString makeStrings( + sal_Int32 mask, char const * const * strings ) +{ + OUStringBuffer buf( 48 ); + while (mask) + { + if (0x80000000 & mask) + { + buf.appendAscii( *strings ); + if ((mask << 1) != 0) // more items following + buf.append( ',' ); + } + mask = (mask << 1); + ++strings; + } + return buf.makeStringAndClear(); +} + +namespace { + +class SocketPermission : public Permission +{ + static char const * s_actions []; + sal_Int32 m_actions; + + OUString m_host; + sal_Int32 m_lowerPort; + sal_Int32 m_upperPort; + mutable OUString m_ip; + mutable bool m_resolveErr; + mutable bool m_resolvedHost; + bool m_wildCardHost; + + inline bool resolveHost() const; + +public: + SocketPermission( + connection::SocketPermission const & perm, + ::rtl::Reference< Permission > const & next = ::rtl::Reference< Permission >() ); + virtual bool implies( Permission const & perm ) const override; + virtual OUString toString() const override; +}; + +} + +char const * SocketPermission::s_actions [] = { "accept", "connect", "listen", "resolve", nullptr }; + +SocketPermission::SocketPermission( + connection::SocketPermission const & perm, + ::rtl::Reference< Permission > const & next ) + : Permission( SOCKET, next ) + , m_actions( makeMask( perm.Actions, s_actions ) ) + , m_host( perm.Host ) + , m_lowerPort( 0 ) + , m_upperPort( 65535 ) + , m_resolveErr( false ) + , m_resolvedHost( false ) + , m_wildCardHost( !perm.Host.isEmpty() && '*' == perm.Host.pData->buffer[ 0 ] ) +{ + if (0xe0000000 & m_actions) // if any (except resolve) is given => resolve implied + m_actions |= 0x10000000; + + // separate host from portrange + sal_Int32 colon = m_host.indexOf( ':' ); + if (colon < 0) // port [range] not given + return; + + sal_Int32 minus = m_host.indexOf( '-', colon +1 ); + if (minus < 0) + { + m_lowerPort = m_upperPort = o3tl::toInt32(m_host.subView( colon +1 )); + } + else if (minus == (colon +1)) // -N + { + m_upperPort = o3tl::toInt32(m_host.subView( minus +1 )); + } + else if (minus == (m_host.getLength() -1)) // N- + { + m_lowerPort = o3tl::toInt32(m_host.subView( colon +1, m_host.getLength() -1 -colon -1 )); + } + else // A-B + { + m_lowerPort = o3tl::toInt32(m_host.subView( colon +1, minus - colon -1 )); + m_upperPort = o3tl::toInt32(m_host.subView( minus +1 )); + } + m_host = m_host.copy( 0, colon ); +} + +inline bool SocketPermission::resolveHost() const +{ + if (m_resolveErr) + return false; + + if (! m_resolvedHost) + { + // dns lookup + SocketAddr addr; + SocketAddr::resolveHostname( m_host, addr ); + OUString ip; + m_resolveErr = (::osl_Socket_Ok != ::osl_getDottedInetAddrOfSocketAddr( + addr.getHandle(), &ip.pData )); + if (m_resolveErr) + return false; + + MutexGuard guard( Mutex::getGlobalMutex() ); + if (! m_resolvedHost) + { + m_ip = ip; + m_resolvedHost = true; + } + } + return m_resolvedHost; +} + +bool SocketPermission::implies( Permission const & perm ) const +{ + // check type + if (SOCKET != perm.m_type) + return false; + SocketPermission const & demanded = static_cast< SocketPermission const & >( perm ); + + // check actions + if ((m_actions & demanded.m_actions) != demanded.m_actions) + return false; + + // check ports + if (demanded.m_lowerPort < m_lowerPort) + return false; + if (demanded.m_upperPort > m_upperPort) + return false; + + // quick check host (DNS names: RFC 1034/1035) + if (m_host.equalsIgnoreAsciiCase( demanded.m_host )) + return true; + // check for host wildcards + if (m_wildCardHost) + { + OUString const & demanded_host = demanded.m_host; + if (demanded_host.getLength() <= m_host.getLength()) + return false; + sal_Int32 len = m_host.getLength() -1; // skip star + return (0 == ::rtl_ustr_compareIgnoreAsciiCase_WithLength( + demanded_host.getStr() + demanded_host.getLength() - len, len, + m_host.pData->buffer + 1, len )); + } + if (demanded.m_wildCardHost) + return false; + + // compare IP addresses + if (! resolveHost()) + return false; + if (! demanded.resolveHost()) + return false; + return m_ip == demanded.m_ip; +} + +OUString SocketPermission::toString() const +{ + OUStringBuffer buf( 48 ); + // host + buf.append( "com.sun.star.connection.SocketPermission (host=\"" ); + buf.append( m_host ); + if (m_resolvedHost) + { + buf.append( '[' ); + buf.append( m_ip ); + buf.append( ']' ); + } + // port + if (0 != m_lowerPort || 65535 != m_upperPort) + { + buf.append( ':' ); + if (m_lowerPort > 0) + buf.append( m_lowerPort ); + if (m_upperPort > m_lowerPort) + { + buf.append( '-' ); + if (m_upperPort < 65535) + buf.append( m_upperPort ); + } + } + // actions + buf.append( "\", actions=\"" ); + buf.append( makeStrings( m_actions, s_actions ) ); + buf.append( "\")" ); + return buf.makeStringAndClear(); +} + +namespace { + +class FilePermission : public Permission +{ + static char const * s_actions []; + sal_Int32 m_actions; + + OUString m_url; + bool m_allFiles; + +public: + FilePermission( + io::FilePermission const & perm, + ::rtl::Reference< Permission > const & next = ::rtl::Reference< Permission >() ); + virtual bool implies( Permission const & perm ) const override; + virtual OUString toString() const override; +}; + +} + +char const * FilePermission::s_actions [] = { "read", "write", "execute", "delete", nullptr }; + +static OUString const & getWorkingDir() +{ + static OUString s_workingDir = []() { + OUString workingDir; + ::osl_getProcessWorkingDir(&workingDir.pData); + return workingDir; + }(); + return s_workingDir; +} + +FilePermission::FilePermission( + io::FilePermission const & perm, + ::rtl::Reference< Permission > const & next ) + : Permission( FILE, next ) + , m_actions( makeMask( perm.Actions, s_actions ) ) + , m_url( perm.URL ) + , m_allFiles( perm.URL == "<<ALL FILES>>" ) +{ + if ( m_allFiles) + return; + + if ( m_url == "*" ) + { + m_url = getWorkingDir() + "/*"; + } + else if ( m_url == "-" ) + { + m_url = getWorkingDir() + "/-"; + } + else if (!m_url.startsWith("file:///")) + { + // relative path + OUString out; + oslFileError rc = ::osl_getAbsoluteFileURL( + getWorkingDir().pData, perm.URL.pData, &out.pData ); + m_url = (osl_File_E_None == rc ? out : perm.URL); // fallback + } +#ifdef _WIN32 + // correct win drive letters + if (9 < m_url.getLength() && '|' == m_url[ 9 ]) // file:///X| + { + constexpr OUStringLiteral s_colon = u":"; + // common case in API is a ':' (sal), so convert '|' to ':' + m_url = m_url.replaceAt( 9, 1, s_colon ); + } +#endif +} + +bool FilePermission::implies( Permission const & perm ) const +{ + // check type + if (FILE != perm.m_type) + return false; + FilePermission const & demanded = static_cast< FilePermission const & >( perm ); + + // check actions + if ((m_actions & demanded.m_actions) != demanded.m_actions) + return false; + + // check url + if (m_allFiles) + return true; + if (demanded.m_allFiles) + return false; + +#ifdef _WIN32 + if (m_url.equalsIgnoreAsciiCase( demanded.m_url )) + return true; +#else + if (m_url == demanded.m_url ) + return true; +#endif + if (m_url.getLength() > demanded.m_url.getLength()) + return false; + // check /- wildcard: all files and recursive in that path + if (m_url.endsWith("/-")) + { + // demanded url must start with granted path (including path trailing path sep) + sal_Int32 len = m_url.getLength() -1; +#ifdef _WIN32 + return (0 == ::rtl_ustr_compareIgnoreAsciiCase_WithLength( + demanded.m_url.pData->buffer, len, m_url.pData->buffer, len )); +#else + return (0 == ::rtl_ustr_reverseCompare_WithLength( + demanded.m_url.pData->buffer, len, m_url.pData->buffer, len )); +#endif + } + // check /* wildcard: all files in that path (not recursive!) + if (m_url.endsWith("/*")) + { + // demanded url must start with granted path (including path trailing path sep) + sal_Int32 len = m_url.getLength() -1; +#ifdef _WIN32 + return ((0 == ::rtl_ustr_compareIgnoreAsciiCase_WithLength( + demanded.m_url.pData->buffer, len, m_url.pData->buffer, len )) && + (0 > demanded.m_url.indexOf( '/', len ))); // in addition, no deeper paths +#else + return ((0 == ::rtl_ustr_reverseCompare_WithLength( + demanded.m_url.pData->buffer, len, m_url.pData->buffer, len )) && + (0 > demanded.m_url.indexOf( '/', len ))); // in addition, no deeper paths +#endif + } + return false; +} + +OUString FilePermission::toString() const +{ + return + // url + "com.sun.star.io.FilePermission (url=\"" + m_url + // actions + + "\", actions=\"" + makeStrings( m_actions, s_actions ) + "\")"; +} + +namespace { + +class RuntimePermission : public Permission +{ + OUString m_name; + +public: + RuntimePermission( + security::RuntimePermission const & perm, + ::rtl::Reference< Permission > const & next = ::rtl::Reference< Permission >() ) + : Permission( RUNTIME, next ) + , m_name( perm.Name ) + {} + virtual bool implies( Permission const & perm ) const override; + virtual OUString toString() const override; +}; + +} + +bool RuntimePermission::implies( Permission const & perm ) const +{ + // check type + if (RUNTIME != perm.m_type) + return false; + RuntimePermission const & demanded = static_cast< RuntimePermission const & >( perm ); + + // check name + return m_name == demanded.m_name; +} + +OUString RuntimePermission::toString() const +{ + return "com.sun.star.security.RuntimePermission (name=\"" + + m_name + "\")"; +} + + +bool AllPermission::implies( Permission const & ) const +{ + return true; +} + +OUString AllPermission::toString() const +{ + return "com.sun.star.security.AllPermission"; +} + + +PermissionCollection::PermissionCollection( + Sequence< Any > const & permissions, PermissionCollection const & addition ) + : m_head( addition.m_head ) +{ + Any const * perms = permissions.getConstArray(); + for ( sal_Int32 nPos = permissions.getLength(); nPos--; ) + { + Any const & perm = perms[ nPos ]; + Type const & perm_type = perm.getValueType(); + + // supported permission types + if (perm_type.equals( cppu::UnoType<io::FilePermission>::get())) + { + m_head = new FilePermission( + *static_cast< io::FilePermission const * >( perm.pData ), m_head ); + } + else if (perm_type.equals( cppu::UnoType<connection::SocketPermission>::get())) + { + m_head = new SocketPermission( + *static_cast< connection::SocketPermission const * >( perm.pData ), m_head ); + } + else if (perm_type.equals( cppu::UnoType<security::RuntimePermission>::get())) + { + m_head = new RuntimePermission( + *static_cast< security::RuntimePermission const * >( perm.pData ), m_head ); + } + else if (perm_type.equals( cppu::UnoType<security::AllPermission>::get())) + { + m_head = new AllPermission( m_head ); + } + else + { + throw RuntimeException( "checking for unsupported permission type: " + perm_type.getTypeName() ); + } + } +} +#ifdef __DIAGNOSE + +Sequence< OUString > PermissionCollection::toStrings() const +{ + vector< OUString > strings; + strings.reserve( 8 ); + for ( Permission * perm = m_head.get(); perm; perm = perm->m_next.get() ) + { + strings.push_back( perm->toString() ); + } + return Sequence< OUString >( strings.data(), strings.size() ); +} +#endif + +static bool implies( + ::rtl::Reference< Permission > const & head, Permission const & demanded ) +{ + for ( Permission * perm = head.get(); perm; perm = perm->m_next.get() ) + { + if (perm->implies( demanded )) + return true; + } + return false; +} + +#ifdef __DIAGNOSE + +static void demanded_diag( + Permission const & perm ) +{ + OUStringBuffer buf( 48 ); + buf.append( "demanding " ); + buf.append( perm.toString() ); + buf.append( " => ok." ); + OString str( + OUStringToOString( buf.makeStringAndClear(), RTL_TEXTENCODING_ASCII_US ) ); + SAL_INFO("stoc",( "%s", str.getStr() ); +} +#endif + +static void throwAccessControlException( + Permission const & perm, Any const & demanded_perm ) +{ + throw security::AccessControlException( + "access denied: " + perm.toString(), + Reference< XInterface >(), demanded_perm ); +} + +void PermissionCollection::checkPermission( Any const & perm ) const +{ + Type const & demanded_type = perm.getValueType(); + + // supported permission types + // stack object of SimpleReferenceObject are ok, as long as they are not + // assigned to a ::rtl::Reference<> (=> delete this) + if (demanded_type.equals( cppu::UnoType<io::FilePermission>::get())) + { + FilePermission demanded( + *static_cast< io::FilePermission const * >( perm.pData ) ); + if (implies( m_head, demanded )) + { +#ifdef __DIAGNOSE + demanded_diag( demanded ); +#endif + return; + } + throwAccessControlException( demanded, perm ); + } + else if (demanded_type.equals( cppu::UnoType<connection::SocketPermission>::get())) + { + SocketPermission demanded( + *static_cast< connection::SocketPermission const * >( perm.pData ) ); + if (implies( m_head, demanded )) + { +#ifdef __DIAGNOSE + demanded_diag( demanded ); +#endif + return; + } + throwAccessControlException( demanded, perm ); + } + else if (demanded_type.equals( cppu::UnoType<security::RuntimePermission>::get())) + { + RuntimePermission demanded( + *static_cast< security::RuntimePermission const * >( perm.pData ) ); + if (implies( m_head, demanded )) + { +#ifdef __DIAGNOSE + demanded_diag( demanded ); +#endif + return; + } + throwAccessControlException( demanded, perm ); + } + else if (demanded_type.equals( cppu::UnoType<security::AllPermission>::get())) + { + AllPermission demanded; + if (implies( m_head, demanded )) + { +#ifdef __DIAGNOSE + demanded_diag( demanded ); +#endif + return; + } + throwAccessControlException( demanded, perm ); + } + else + { + throw RuntimeException( "checking for unsupported permission type: " + demanded_type.getTypeName() ); + } +} + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |