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tools: virt-login-shell: Fix group list bounds checking

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The list certainly isn't zero terminated and it would disallow usage of
group 'root'. Pass in the array size and match against it.
This commit is contained in:
Peter Krempa 2016-06-17 14:50:44 +02:00
parent 0a07bf3dc5
commit 94f93d7071
1 changed files with 4 additions and 3 deletions
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7
tools/virt-login-shell.c
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@ -47,7 +47,8 @@ static const char *conf_file = SYSCONFDIR "/libvirt/virt-login-shell.conf";
static int virLoginShellAllowedUser(virConfPtr conf, static int virLoginShellAllowedUser(virConfPtr conf,
const char *name, const char *name,
gid_t *groups) gid_t *groups,
size_t ngroups)
{ {
virConfValuePtr p; virConfValuePtr p;
int ret = -1; int ret = -1;
@ -74,7 +75,7 @@ static int virLoginShellAllowedUser(virConfPtr conf,
ptr = &pp->str[1]; ptr = &pp->str[1];
if (!*ptr) if (!*ptr)
continue; continue;
for (i = 0; groups[i]; i++) { for (i = 0; i < ngroups; i++) {
if (!(gname = virGetGroupName(groups[i]))) if (!(gname = virGetGroupName(groups[i])))
continue; continue;
if (fnmatch(ptr, gname, 0) == 0) { if (fnmatch(ptr, gname, 0) == 0) {
@ -306,7 +307,7 @@ main(int argc, char **argv)
if ((ngroups = virGetGroupList(uid, gid, &groups)) < 0) if ((ngroups = virGetGroupList(uid, gid, &groups)) < 0)
goto cleanup; goto cleanup;
if (virLoginShellAllowedUser(conf, name, groups) < 0) if (virLoginShellAllowedUser(conf, name, groups, ngroups) < 0)
goto cleanup; goto cleanup;
if (virLoginShellGetShellArgv(conf, &shargv, &shargvlen) < 0) if (virLoginShellGetShellArgv(conf, &shargv, &shargvlen) < 0)