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e5e920d178
io_uring rules have the following format: io_uring [<access_mode>] [<label>], access_mode := 'sqpoll'|'override_creds' label := 'label' '=' <target label> Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>
141 lines
3.3 KiB
C++
141 lines
3.3 KiB
C++
/*
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* Copyright (c) 2023
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* Canonical Ltd. (All rights reserved)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, contact or Canonical Ltd.
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*/
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#include "parser.h"
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#include "profile.h"
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#include "io_uring.h"
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#include <iomanip>
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#include <string>
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#include <iostream>
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#include <sstream>
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void io_uring_rule::move_conditionals(struct cond_entry *conds)
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{
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struct cond_entry *cond_ent;
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list_for_each(conds, cond_ent) {
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/* disallow keyword 'in' (list) */
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if (!cond_ent->eq)
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yyerror("keyword \"in\" is not allowed in io_uring rules\n");
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if (list_len(cond_ent->vals) > 1)
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yyerror("io_uring conditional \"%s\" only supports a single value\n",
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cond_ent->name);
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if (strcmp(cond_ent->name, "label") == 0) {
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move_conditional_value("io_uring", &label, cond_ent);
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} else {
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yyerror("invalid io_uring conditional \"%s\"\n",
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cond_ent->name);
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}
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}
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}
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io_uring_rule::io_uring_rule(perms_t perms_p, struct cond_entry *conds, struct cond_entry *ring_conds):
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perms_rule_t(AA_CLASS_IO_URING), label(NULL)
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{
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if (perms_p) {
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if (perms_p & ~AA_VALID_IO_URING_PERMS) {
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yyerror("perms contains invalid permissions for io_uring\n");
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}
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perms = perms_p;
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} else {
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/* default to all perms */
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perms = AA_VALID_IO_URING_PERMS;
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}
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move_conditionals(conds);
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move_conditionals(ring_conds);
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free_cond_list(conds);
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free_cond_list(ring_conds);
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}
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ostream &io_uring_rule::dump(ostream &os)
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{
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class_rule_t::dump(os);
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if (perms != AA_VALID_IO_URING_PERMS) {
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os << " ( ";
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if (perms & AA_IO_URING_OVERRIDE_CREDS)
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os << "override_creds ";
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if (perms & AA_IO_URING_SQPOLL)
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os << " sqpoll ";
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os << ")";
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}
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if (label)
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os << " label=" << label;
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os << ",\n";
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return os;
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}
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int io_uring_rule::expand_variables(void)
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{
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return 0;
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}
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void io_uring_rule::warn_once(const char *name)
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{
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rule_t::warn_once(name, "io_uring rules not enforced");
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}
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int io_uring_rule::gen_policy_re(Profile &prof)
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{
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std::ostringstream buffer;
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std::string buf, labelbuf;
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if (!features_supports_io_uring) {
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warn_once(prof.name);
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return RULE_NOT_SUPPORTED;
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}
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buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << AA_CLASS_IO_URING;
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buf = buffer.str();
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if (label) {
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if (!convert_entry(labelbuf, label))
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goto fail;
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buffer << labelbuf;
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} else {
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buffer << default_match_pattern;
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}
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if (perms & AA_VALID_IO_URING_PERMS) {
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if (!prof.policy.rules->add_rule(buf.c_str(), rule_mode == RULE_DENY, perms,
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audit == AUDIT_FORCE ? perms : 0,
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dfaflags))
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goto fail;
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if (perms & AA_IO_URING_OVERRIDE_CREDS) {
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buf = buffer.str(); /* update buf to have label */
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if (!prof.policy.rules->add_rule(buf.c_str(), rule_mode == RULE_DENY,
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perms, audit == AUDIT_FORCE ? perms : 0,
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dfaflags))
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goto fail;
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}
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}
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return RULE_OK;
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fail:
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return RULE_ERROR;
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}
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