A Better Finder Rename 9.50
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Enables access controls on files. Access controls fall into three categories,files from which Ghostscript is permitted to read, ones to which it is permittedto write, and ones over which it has "control" (i.e. delete/rename). Theseaccess controls apply to all files accessed via Ghostscript's internalinterface to the C library file handling. Whilst we have taken considerable pains toensure that all the code we maintain (as well as the so called "contrib" devices,that are devices included in our release packages, but not strictly maintained by theGhostscript development team) uses this interface, we have no control over thirdpartycode.This is an entirely new implementation of SAFER for Ghostscript versions9.50 and later. Earlier versions (see "-dOLDSAFER") relied onstoring the file permission lists in Postscript VM (Virtual Memory), and only appliedfile access permissions to the Postscript file related operators. It relied on restrictingthe function of setpagedevice to avoid the device code from being manipulatedinto opening arbitrary files. The application of the file permissions was done within theinternal context of the Postscript interpreter, and some other aspects of the Postscriptrestrictions were applied in the Postscript environment. With so many of the feature'scapabilities relying on the Postscript context and environment, by using other (Ghostscriptspecific) features maliciously, the restrictions could be overridden.Whilst the path storage and application of the permissions is implemented entirely in C,it is still possible for Postscript to add and remove paths from the permissions lists(see .addcontrolpath) until such time as theaccess controls are enabled (see .activatepathcontrol),any call to .addcontrolpath after .activatepathcontrol will result in aFatal error causing the interpreter to immediately exit.An incompatibility exists between the pre-9.50 and 9.50 and later SAFER.By removing storage and application entirely from the Postscript languageenvironment and internal context, SAFER is no longer affected by Postscriptsave/restore operations. Previously, it was possibleto do the equivalent of:save.setsafePostscript opsrestoreIn that sequence, the Postscript ops would run with SAFER protectionbut after the restore, SAFER would no longer be in force. This is no longer the case.After the call to .setsafe the file controls are in force until theinterpreter exits. As the 9.50 and later implementation no longer restricts theoperation of setpagedevice, and because this capability is extremelyrarely used, we feel the improvement in security warrants the small reduction inflexibility.Path matching is very simple: it is case sensitive, and we do not implement full featured"globbing" or regular expression matching (such complexity would significantlyand negatively impact performance). Further, the string parameter(s) passed to the--permit-file-* option must exactly match the string(s) used to referencethe file(s): for example, you cannot use a absolute path to grant permission, andthen a relative path to reference the file (or vice versa) - the path match will fail.Similarly, you cannot grant permission through one symlink, and then reference a filedirectly, or through an alternative symlink - again, the matching will fail.The following cases are handled:"/path/to/file"Permits access only to the file: "/path/to/file""/path/to/directory/"Permits access to any file in, and only in, the directory: "/path/to/directory""/path/to/directory/*"Permits access to any file in the directory: "/path/to/directory" andany child of that directory.Important Note for Windows Users:The file/path pattern matching is case sensitive, even on Windows. This is achange in behaviour compared to the old code which, on Windows, was caseinsensitive. This is in recognition of changes in Windows behaviour,in that it now supports (although does not enforce) case sensitivity.Four command line parameters permit explicit control of the paths included inthe access control lists:--permit-file-read=pathlist Adds a path, or list of paths, to the "permit read" list. A listof paths is a series of paths separated by the appropriate path list separatorfor your platform (for example, on Unix-like systems it is ":"and on MS Windows it is ";").--permit-file-write=pathlist Adds a path, or list of paths, to the "permit write" list. A listof paths is a series of paths separated by the appropriate path list separatorfor your platform (for example, on Unix-like systems it is ":"and on MS Windows it is ";").--permit-file-control=pathlist Adds a path, or list of paths, to the "permit control" list. A listof paths is a series of paths separated by the appropriate path list separatorfor your platform (for example, on Unix-like systems it is ":"and on MS Windows it is ";").--permit-file-all=pathlist Adds a path, or list of paths, to the all the above lists. A listof paths is a series of paths separated by the appropriate path list separatorfor your platform (for example, on Unix-like systems it is ":"and on MS Windows it is ";").'*' may be used as a wildcard in the above paths to mean "anycharacter other than the directory separator. Do not use twoor more *'s without intervening characters.Finally, paths supplied on the command line (such as those in -I,-sFONTPATH parameters) are added to the permitted reading list.Similarly, paths read during initialisation from Fontmap, cidfmap,and the platform specific font file enumeration (e.g. fontconfig on Unix systems)are automatically added to the permit read lists. -dOLDSAFERNOTE: This enables deprecated code which will shortly be removedUsed in combination with -dSAFER (or .setsafe) enablesthe pre-9.50 SAFER implementation. It is included (for now) in case any users finda case where the 9.50 and later SAFER does not work for them. It meanssuch users can keep working until we have assessed the issue, and distributed a solution.Disables the deletefile and renamefileoperators, and the ability to open piped commands (%pipe%cmd)at all. Only %stdout and %stderr can be openedfor writing. Disables reading of files other than %stdin,those given as a command line argument, or those contained on one of the pathsgiven by LIBPATH and FONTPATH and specified by the system params /FontResourceDirand /GenericResourceDir.This mode also sets the .LockSafetyParamsparameter of the default device, or the device specified with the -sDEVICE= switch to protect against programs that attempt to write to files using theOutputFile device parameter. Note that since the device parameters specifiedon the command line (including OutputFile) are set prior to SAFER mode,the -sOutputFile=... on the command line is unrestricted.
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