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/*
* Copyright (c) 2022
* Canonical, Ltd. (All rights reserved)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, contact Novell, Inc. or Canonical
* Ltd.
*/
#include "parser.h"
#include "profile.h"
#include "userns.h"
#include <iomanip>
#include <string>
#include <iostream>
#include <sstream>
void userns_rule::move_conditionals(struct cond_entry *conds)
{
struct cond_entry *cond_ent;
list_for_each(conds, cond_ent) {
/* for now disallow keyword 'in' (list) */
if (!cond_ent->eq)
yyerror("keyword \"in\" is not allowed in userns rules\n");
/* no valid conditionals atm */
yyerror("invalid userns rule conditional \"%s\"\n",
cond_ent->name);
}
}
userns_rule::userns_rule(perm32_t perms_p, struct cond_entry *conds):
perms_rule_t(AA_CLASS_NS)
{
if (perms_p) {
if (perms_p & ~AA_VALID_USERNS_PERMS)
yyerror("perms contains invalid permissions for userns\n");
perms = perms_p;
} else {
/* default to all perms */
perms = AA_VALID_USERNS_PERMS;
}
move_conditionals(conds);
free_cond_list(conds);
}
ostream &userns_rule::dump(ostream &os)
{
class_rule_t::dump(os);
if (perms != AA_VALID_USERNS_PERMS) {
if (perms & AA_USERNS_CREATE)
os << " create";
}
os << ",\n";
return os;
}
int userns_rule::expand_variables(void)
{
return 0;
}
void userns_rule::warn_once(const char *name)
{
rule_t::warn_once(name, "userns rules not enforced");
}
int userns_rule::gen_policy_re(Profile &prof)
{
std::ostringstream buffer;
std::string buf;
if (!features_supports_userns) {
warn_once(prof.name);
return RULE_NOT_SUPPORTED;
}
buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << AA_CLASS_NS;
buf = buffer.str();
if (perms & AA_VALID_USERNS_PERMS) {
if (!prof.policy.rules->add_rule(buf.c_str(), priority,
rule_mode, perms,
audit == AUDIT_FORCE ? perms : 0,
parseopts))
goto fail;
/* add a mediates_userns rule for every rule added. It
* needs to be the same priority
*/
if (!prof.policy.rules->add_rule(buf.c_str(), priority,
RULE_ALLOW, AA_MAY_READ, 0,
parseopts))
goto fail;
}
return RULE_OK;
fail:
return RULE_ERROR;
}
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