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more elevate docs

elevate-erg
Cat Stevens 2018-05-21 12:41:07 -04:00 committed by Doug Coleman
parent a34a68cb06
commit 147407a291
1 changed files with 25 additions and 3 deletions
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basis/elevate/elevate-docs.factor
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USING: arrays elevate.private help.markup help.syntax
io.launcher kernel strings system ;
io.launcher kernel strings system words ;
IN: elevate
: $say-shexw ( children -- )
drop "ShellExecuteW" dup "windows.shell32" lookup-word [ ($link) ] [ $snippet ] if ;
ABOUT: elevate
ARTICLE: "elevate" "Elevated permissions API"
"Ported from " { $url "https://github.com/barneygale/elevate" "Barney Gale's implementation" } " in Python."
"The " { $vocab-link "elevate" } " vocabulary provides abstractions for running programs with elevated (administrator) privileges (permissions). It allows code to relaunch itself or other programs with administrator privileges after requiring a password."
$nl
"This vocabulary is inspired by and ported from " { $url "https://github.com/barneygale/elevate" "Barney Gale's elevate.py" } "."
{ $subsections elevate elevated lowered }
"However, there are many caveats: " { $link "elevate.bugs" }
;
ARTICLE: "elevate.bugs" "Elevate bugs and caveats"
"There are many inherent platform-specific limitations and workarounds in the " { $vocab-link "elevate" } " elevated privileges API. This article explains and documents them for the curious, future maintainers, or those who run into problems."
{ $heading "macOS" }
"On Apple macOS, an Applescript command is attempted for a graphical method before " { $snippet "sudo" } ". Sometimes, this command appears to execute incorrectly due to the group of the user owning the calling process. On macOS, " { $snippet "sudo" } " suffers the drawback mentioned below for applications which do not have a TTY connected."
{ $heading "Linux, *BSD and other Unix-likes" }
"On Linux, " { $snippet "gksudo" } ", " { $snippet "kdesudo" } ", and " { $snippet "pkexec" } " are all attempted graphical methods before " { $snippet "sudo" } "."
{ $list
{ { $snippet "pkexec" } " is the preferred and most secure graphical authentication method on Linux. It is undesirable for Factor applications, because unless a certain rare global registry value is set, " { $snippet "pkexec" } " does not set the " { $snippet "$DISPLAY" } " environment variable, and thus cannot launch graphical applications despite being a graphical program itself. It is tried after " { $snippet "gksudo" } " and " { $snippet "kdesudo" } " but before " { $snippet "sudo" } "." }
{ { $snippet "gksudo" } " and " { $snippet "kdesudo" } " are deprecated, but still present on most GTK- and KDE-based systems, respectively. GTK is more widespread than KDE so " { $snippet "gksudo" } " is tried before " { $snippet "kdesudo" } ". These old-fashioned methods ensure that the launched application can be graphical, so they are preferred for Factor." }
{ { $snippet "sudo" } " is the final and most robust strategy tried on Linux. It is text-based, so it requires the calling process to have an active and accessible terminal (TTY) for user authentication. If the calling Factor application was started from the desktop graphical shell rather than from a TTY, this method will fail." }
}
"On other Unix-like or POSIX-like operating systems, " { $snippet "sudo" } " is the only consistently popular method of authentication, and it suffers the same drawback on other Unix-likes as on Linux."
{ $heading "Windows" }
{ "On Windows, the FFI word " { $say-shexw } " is used with the verb " { $snippet "runas" } " to force the new process to run with User Account Control." }
;
HELP: elevated