0c0f068f35
Switch off HAVE_SAVED_UIDS since it activates a code path for temporary privilege dropping which does not work on NixOS. Vixie-cron's sources ship with two implementations. Unfortunately, the one activated by HAVE_SAVED_UIDS (using setuid()) does not work on NixOS. Saved UIDs work only if the program which is using them has the setuid bit set on its own executable, not if called from a setuid wrapper (as we do it in NixOS). The other implementation (using setreuid()) works without problems. Quote from <http://stackoverflow.com/questions/8499296/realuid-saved-uid-effective-uid-whats-going-on>: If you're euid is root and you change the uid, the privileges gets dropped permanently.If effective user id is not root then saved user id is never touched and you can regain the root privilege back anytime you want in your program. Also extend the default PATH with NixOS-specific bin directories as vixie-cron's default is not really usable on NixOS. Re #16518 Closes #16522
38 lines
1.3 KiB
Nix
38 lines
1.3 KiB
Nix
{stdenv, fetchurl, sendmailPath ? "/usr/sbin/sendmail"}:
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stdenv.mkDerivation {
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name = "cron-4.1";
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src = fetchurl {
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url = ftp://ftp.isc.org/isc/cron/cron_4.1.shar;
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sha256 = "16n3dras4b1jh7g958nz1k54pl9pg5fwb3fvjln8z67varvq6if4";
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};
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unpackCmd = "(mkdir cron && cd cron && sh $curSrc)";
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preBuild = ''
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substituteInPlace Makefile --replace ' -o root' ' ' --replace 111 755
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makeFlags="DESTROOT=$out"
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# We want to ignore the $glibc/include/paths.h definition of
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# sendmail path.
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# Also set a usable default PATH (#16518).
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cat >> pathnames.h <<__EOT__
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#undef _PATH_SENDMAIL
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#define _PATH_SENDMAIL "${sendmailPath}"
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#undef _PATH_DEFPATH
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#define _PATH_DEFPATH "/var/setuid-wrappers:/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/run/current-system/sw/bin:/run/current-system/sw/sbin:/usr/bin:/bin"
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__EOT__
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# Implicit saved uids do not work here due to way NixOS uses setuid wrappers
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# (#16518).
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echo "#undef HAVE_SAVED_UIDS" >> externs.h
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'';
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preInstall = "mkdir -p $out/bin $out/sbin $out/share/man/man1 $out/share/man/man5 $out/share/man/man8";
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meta = {
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description = "Daemon for running commands at specific times (Vixie Cron)";
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platforms = stdenv.lib.platforms.linux;
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};
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}
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