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netns: avoid directory traversal

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ip netns keeps track of created namespaces with bind mounts named
/var/run/netns/<namespace>. No input sanitization is done, allowing creation and
deletion of files relatives to /var/run/netns or, if the path is non existent or
invalid, allows to create "untracked" namespaces (invisible to the tool).

This commit denies creation or deletion of namespaces with names contaning
"/" or matching exactly "." or "..".

Signed-off-by: Matteo Croce <mcroce@redhat.com>
This commit is contained in:
Matteo Croce 2017-07-20 00:36:32 +02:00 committed by Stephen Hemminger
parent b09515553f
commit 79928fd055
1 changed files with 10 additions and 0 deletions
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10
ip/ipnetns.c
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@ -766,6 +766,11 @@ static int netns_monitor(int argc, char **argv)
return 0;
}
static int invalid_name(const char *name)
{
return strchr(name, '/') || !strcmp(name, ".") || !strcmp(name, "..");
}
int do_netns(int argc, char **argv)
{
netns_nsid_socket_init();
@ -775,6 +780,11 @@ int do_netns(int argc, char **argv)
return netns_list(0, NULL);
}
if (argc > 1 && invalid_name(argv[1])) {
fprintf(stderr, "Invalid netns name \"%s\"\n", argv[1]);
exit(-1);
}
if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) ||
(matches(*argv, "lst") == 0)) {
netns_map_init();