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/*
* Copyright (c) 2023
* 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 Canonical Ltd.
*/
#include "common_optarg.h"
#include "parser.h"
#include "profile.h"
#include "io_uring.h"
#include <iomanip>
#include <string>
#include <iostream>
#include <sstream>
void io_uring_rule::move_conditionals(struct cond_entry *conds)
{
struct cond_entry *cond_ent;
list_for_each(conds, cond_ent) {
/* disallow keyword 'in' (list) */
if (!cond_ent->eq)
yyerror("keyword \"in\" is not allowed in io_uring rules\n");
if (list_len(cond_ent->vals) > 1)
yyerror("io_uring conditional \"%s\" only supports a single value\n",
cond_ent->name);
if (strcmp(cond_ent->name, "label") == 0) {
move_conditional_value("io_uring", &label, cond_ent);
} else {
yyerror("invalid io_uring conditional \"%s\"\n",
cond_ent->name);
}
}
}
io_uring_rule::io_uring_rule(perm32_t perms_p, struct cond_entry *conds, struct cond_entry *ring_conds):
perms_rule_t(AA_CLASS_IO_URING), label(NULL)
{
if (perms_p) {
if (perms_p & ~AA_VALID_IO_URING_PERMS) {
yyerror("perms contains invalid permissions for io_uring\n");
}
perms = perms_p;
} else {
/* default to all perms */
perms = AA_VALID_IO_URING_PERMS;
}
move_conditionals(conds);
move_conditionals(ring_conds);
free_cond_list(conds);
free_cond_list(ring_conds);
}
ostream &io_uring_rule::dump(ostream &os)
{
class_rule_t::dump(os);
if (perms != AA_VALID_IO_URING_PERMS) {
os << " ( ";
if (perms & AA_IO_URING_OVERRIDE_CREDS)
os << "override_creds ";
if (perms & AA_IO_URING_SQPOLL)
os << " sqpoll ";
os << ")";
}
if (label)
os << " label=" << label;
os << ",\n";
return os;
}
int io_uring_rule::expand_variables(void)
{
return 0;
}
void io_uring_rule::warn_once(const char *name)
{
rule_t::warn_once(name, "io_uring rules not enforced");
}
int io_uring_rule::gen_policy_re(Profile &prof)
{
std::ostringstream buffer;
std::string buf, labelbuf;
if (!features_supports_io_uring) {
warn_once(prof.name);
return RULE_NOT_SUPPORTED;
}
buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << AA_CLASS_IO_URING;
buf = buffer.str();
if (label) {
if (!convert_entry(labelbuf, label))
goto fail;
buffer << labelbuf;
} else {
buffer << default_match_pattern;
}
if (perms & AA_VALID_IO_URING_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_io_uring 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;
if (perms & AA_IO_URING_OVERRIDE_CREDS) {
buf = buffer.str(); /* update buf to have label */
if (!prof.policy.rules->add_rule(buf.c_str(),
priority, rule_mode,
perms, audit == AUDIT_FORCE ? perms : 0,
parseopts))
goto fail;
}
}
return RULE_OK;
fail:
return RULE_ERROR;
}
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