File 50864dcd-CVE-2020-25637.patch of Package libvirt.16766
commit 50864dcda191eb35732dbd80fb6ca251a6bba923
Author: Ján Tomko <jtomko@redhat.com>
Date: Fri Sep 18 16:09:25 2020 +0200
rpc: add support for filtering @acls by uint params
CVE-2020-25637
Add a new field to @acl annotations for filtering by
unsigned int parameters.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Index: libvirt-4.0.0/src/remote/remote_protocol.x
===================================================================
--- libvirt-4.0.0.orig/src/remote/remote_protocol.x
+++ libvirt-4.0.0/src/remote/remote_protocol.x
@@ -3499,6 +3499,7 @@ enum remote_procedure {
*
* - @acl: <object>:<permission>
* - @acl: <object>:<permission>:<flagname>
+ * - @acl: <object>:<permission>::<param>:<value>
*
* Declare the access control requirements for the API. May be repeated
* multiple times, if multiple rules are required.
@@ -3508,6 +3509,8 @@ enum remote_procedure {
* <permission> is one of the permissions in access/viraccessperm.h
* <flagname> indicates the rule only applies if the named flag
* is set in the API call
+ * <param> and <value> can be used to check an unsigned int parameter
+ * against value
*
* - @aclfilter: <object>:<permission>
*
Index: libvirt-4.0.0/src/rpc/gendispatch.pl
===================================================================
--- libvirt-4.0.0.orig/src/rpc/gendispatch.pl
+++ libvirt-4.0.0/src/rpc/gendispatch.pl
@@ -2048,10 +2048,12 @@ elsif ($mode eq "client") {
my @acl;
foreach (@{$acl}) {
my @bits = split /:/;
- push @acl, { object => $bits[0], perm => $bits[1], flags => $bits[2] }
+ push @acl, { object => $bits[0], perm => $bits[1], flags => $bits[2],
+ param => $bits[3], value => $bits[4] }
}
my $checkflags = 0;
+ my $paramtocheck = undef;
for (my $i = 1 ; $i <= $#acl ; $i++) {
if ($acl[$i]->{object} ne $acl[0]->{object}) {
die "acl for '$call->{ProcName}' cannot check different objects";
@@ -2059,6 +2061,9 @@ elsif ($mode eq "client") {
if (defined $acl[$i]->{flags} && length $acl[$i]->{flags}) {
$checkflags = 1;
}
+ if (defined $acl[$i]->{param}) {
+ $paramtocheck = $acl[$i]->{param};
+ }
}
my $apiname = $prefix . $call->{ProcName};
@@ -2092,6 +2097,9 @@ elsif ($mode eq "client") {
if ($checkflags) {
push @argdecls, "unsigned int flags";
}
+ if (defined $paramtocheck) {
+ push @argdecls, "unsigned int " . $paramtocheck;
+ }
my $ret;
my $pass;
@@ -2150,6 +2158,17 @@ elsif ($mode eq "client") {
}
print " ";
}
+ if (defined $acl->{param}) {
+ my $param = $acl->{param};
+ my $value = $acl->{value};
+ if ($value =~ /^\!/) {
+ $value = substr $value, 1;
+ print "($param != ($value)) &&\n";
+ } else {
+ print "($param == ($value)) &&\n";
+ }
+ print " ";
+ }
print "(rv = $method(" . join(", ", @argvars, $perm) . ")) <= 0) {\n";
print " virObjectUnref(mgr);\n";
if ($action eq "Ensure") {