josch/user-unshare
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

map the user outside to the root user inside or otherwise the root user insude cannot access the files owned by the user outside

Browse source
This commit is contained in:
Johannes 'josch' Schauer 2015-10-25 19:50:49 +01:00
parent 32d40e541b
commit ca526df876
1 changed files with 9 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
user-unshare
View file

@ -84,10 +84,11 @@ use Pod::Usage;
# read the files /etc/subuid and /etc/subgid and return the mapping of user and
# group ids, respectively for the given username
sub read_subuid_subgid($) {
my $username = shift;
sub read_subuid_subgid() {
my $username = getpwuid $<;
my ($subid, $num_subid, $fh, $n);
my @result;
# map the current user and group id to the root user by default
my @result = (["u", 0, $<, 1], ["g", 0, $<, 1]);
if (-f "/etc/subuid") {
open $fh, "<", "/etc/subuid" or die "cannot open /etc/subuid for reading: $!";
@ -96,7 +97,8 @@ sub read_subuid_subgid($) {
last if ($n eq $username);
}
close $fh;
push @result, ["u", 0, $subid, $num_subid];
# all other user ids start after root
push @result, ["u", 1, $subid, $num_subid];
}
if ( -f "/etc/subgid") {
@ -106,7 +108,8 @@ sub read_subuid_subgid($) {
last if ($n eq $username);
}
close $fh;
push @result, ["g", 0, $subid, $num_subid];
# all other group ids start after root
push @result, ["g", 1, $subid, $num_subid];
}
return @result;
@ -162,7 +165,7 @@ my $origgid = $(;
# new[ug]idmap is called with the exact values from /etc/sub[ug]id,
# respectively.
if (scalar @idmap == 0) {
@idmap = read_subuid_subgid getpwuid $<;
@idmap = read_subuid_subgid;
}
# Create a pipe for the parent process to signal the child process that it is