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https://github.com/NixOS/nixpkgs.git
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20b364f4de
After the change from revision 30103, nixos-rebuild suddenly consumed freaky amounts of memory. I had to abort the process after it had allocated well in excess of 30GB(!) of RAM. I'm not sure what is causing this behavior, but undoing that assignment fixes the problem. The other two commits needed to be revoked, too, because they depend on 30103. svn path=/nixos/trunk/; revision=30127
128 lines
3.4 KiB
Nix
128 lines
3.4 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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inherit (config.security) wrapperDir;
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setuidWrapper = pkgs.stdenv.mkDerivation {
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name = "setuid-wrapper";
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buildCommand = ''
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ensureDir $out/bin
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gcc -Wall -O2 -DWRAPPER_DIR=\"${wrapperDir}\" \
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${./setuid-wrapper.c} -o $out/bin/setuid-wrapper
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strip -s $out/bin/setuid-wrapper
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'';
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};
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in
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{
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###### interface
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options = {
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security.setuidPrograms = mkOption {
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default = [];
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description = ''
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Only the programs from system path listed here will be made
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setuid root (through a wrapper program).
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'';
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};
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security.extraSetuidPrograms = mkOption {
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default = [];
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example = ["fusermount"];
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description = ''
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This option lists additional programs that must be made setuid
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root. Obsolete, use setuidPrograms instead.
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'';
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};
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security.setuidOwners = mkOption {
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default = [];
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example =
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[ { program = "sendmail";
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owner = "nobody";
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group = "postdrop";
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setuid = false;
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setgid = true;
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}
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];
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description = ''
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This option allows the ownership and permissions on the setuid
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wrappers for specific programs to be overriden from the
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default (setuid root, but not setgid root).
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'';
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};
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security.wrapperDir = mkOption {
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default = "/var/setuid-wrappers";
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description = ''
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This option defines the path to the setuid wrappers. It
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should generally not be overriden. Some packages in nixpkgs rely on
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wrapperDir == /var/setuid-wrappers
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'';
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};
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};
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###### implementation
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config = {
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security.setuidPrograms =
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[ "fusermount" "wodim" "cdrdao" "growisofs" ];
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system.activationScripts.setuid =
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let
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setuidPrograms =
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(map (x: { program = x; owner = "root"; group = "root"; setuid = true; })
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(config.security.setuidPrograms ++
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config.security.extraSetuidPrograms))
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++ config.security.setuidOwners;
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makeSetuidWrapper =
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{ program
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, source ? ""
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, owner ? "nobody"
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, group ? "nogroup"
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, setuid ? false
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, setgid ? false
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, permissions ? "u+rx,g+x,o+x"
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}:
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''
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source=${if source != "" then source else "$(PATH=$SETUID_PATH type -tP ${program})"}
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if test -z "$source"; then
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# If we can't find the program, fall back to the
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# system profile.
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source=/nix/var/nix/profiles/default/bin/${program}
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fi
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cp ${setuidWrapper}/bin/setuid-wrapper ${wrapperDir}/${program}
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echo -n "$source" > ${wrapperDir}/${program}.real
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chmod 0000 ${wrapperDir}/${program} # to prevent races
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chown ${owner}.${group} ${wrapperDir}/${program}
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chmod "u${if setuid then "+" else "-"}s,g${if setgid then "+" else "-"}s,${permissions}" ${wrapperDir}/${program}
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'';
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in stringAfter [ "users" ]
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''
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# Look in the system path and in the default profile for
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# programs to be wrapped.
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SETUID_PATH=${config.system.path}/bin:${config.system.path}/sbin
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if test -d ${wrapperDir}; then rm -f ${wrapperDir}/*; fi # */
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mkdir -p ${wrapperDir}
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${concatMapStrings makeSetuidWrapper setuidPrograms}
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'';
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};
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}
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