124 lines
3.1 KiB
Perl
124 lines
3.1 KiB
Perl
#!/usr/bin/perl
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use warnings;
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use strict;
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use Cwd q{abs_path};
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use Data::Dumper ;
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use IkiWiki;
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package IkiWiki;
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sub gen_wrapper () { #{{{
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$config{srcdir}=abs_path($config{srcdir});
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$config{destdir}=abs_path($config{destdir});
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my $this=abs_path($0);
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if (! -x $this) {
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error(sprintf(gettext("%s doesn't seem to be executable"), $this));
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}
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if ($config{setup}) {
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error(gettext("cannot create a wrapper that uses a setup file"));
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}
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my $wrapper=possibly_foolish_untaint($config{wrapper});
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if (! defined $wrapper || ! length $wrapper) {
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error(gettext("wrapper filename not specified"));
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}
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delete $config{wrapper};
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my @envsave;
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push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
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CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
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HTTP_COOKIE REMOTE_USER} if $config{cgi};
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my $envsave="";
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foreach my $var (@envsave) {
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$envsave.=<<"EOF"
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if ((s=getenv("$var")))
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addenv("$var", s);
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EOF
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}
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$Data::Dumper::Indent=0; # no newlines
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my $configstring=Data::Dumper->Dump([\%config], ['*config']);
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$configstring=~s/\\/\\\\/g;
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$configstring=~s/"/\\"/g;
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$configstring=~s/\n/\\n/g;
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#translators: The first parameter is a filename, and the second is
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#translators: a (probably not translated) error message.
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open(OUT, ">$wrapper.c") || error(sprintf(gettext("failed to write %s: %s"), "$wrapper.c", $!));;
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print OUT <<"EOF";
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/* A wrapper for ikiwiki, can be safely made suid. */
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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extern char **environ;
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char *newenviron[$#envsave+5];
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int i=0;
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addenv(char *var, char *val) {
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char *s=malloc(strlen(var)+1+strlen(val)+1);
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if (!s)
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perror("malloc");
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sprintf(s, "%s=%s", var, val);
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newenviron[i++]=s;
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}
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int main (int argc, char **argv) {
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/* Sanitize environment. */
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char *s;
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$envsave
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newenviron[i++]="HOME=$ENV{HOME}";
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newenviron[i++]="WRAPPED_OPTIONS=$configstring";
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newenviron[i]=NULL;
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environ=newenviron;
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if (setregid(getegid(), -1) != 0 &&
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setregid(getegid(), -1) != 0) {
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perror("failed to drop real gid");
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exit(1);
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}
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if (setreuid(geteuid(), -1) != 0 &&
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setreuid(geteuid(), -1) != 0) {
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perror("failed to drop real uid");
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exit(1);
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}
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execl("$this", "$this", NULL);
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perror("exec $this");
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exit(1);
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}
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EOF
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close OUT;
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my $cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc';
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if (system($cc, "$wrapper.c", "-o", "$wrapper.new") != 0) {
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#translators: The parameter is a C filename.
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error(sprintf(gettext("failed to compile %s"), "$wrapper.c"));
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}
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unlink("$wrapper.c");
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if (defined $config{wrappergroup}) {
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my $gid=(getgrnam($config{wrappergroup}))[2];
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if (! defined $gid) {
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error(sprintf("bad wrappergroup"));
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}
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if (! chown(-1, $gid, "$wrapper.new")) {
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error("chown $wrapper.new: $!");
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}
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}
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if (defined $config{wrappermode} &&
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! chmod(oct($config{wrappermode}), "$wrapper.new")) {
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error("chmod $wrapper.new: $!");
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}
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if (! rename("$wrapper.new", $wrapper)) {
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error("rename $wrapper.new $wrapper: $!");
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}
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#translators: The parameter is a filename.
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printf(gettext("successfully generated %s"), $wrapper);
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print "\n";
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} #}}}
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1
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