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/*
* Copyright (c) 2014
* 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 "ptrace.h"
#include <iomanip>
#include <string>
#include <sstream>
int parse_ptrace_perms(const char *str_perms, perm32_t *perms, int fail)
{
return parse_X_perms("ptrace", AA_VALID_PTRACE_PERMS, str_perms, perms, fail);
}
void ptrace_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 ptrace rules\n");
if (strcmp(cond_ent->name, "peer") == 0) {
move_conditional_value("ptrace", &peer_label, cond_ent);
} else {
yyerror("invalid ptrace rule conditional \"%s\"\n",
cond_ent->name);
}
}
}
ptrace_rule::ptrace_rule(perm32_t perms_p, struct cond_entry *conds):
perms_rule_t(AA_CLASS_PTRACE), peer_label(NULL)
{
if (perms_p) {
if (perms_p & ~AA_VALID_PTRACE_PERMS)
yyerror("perms contains invalid permissions for ptrace\n");
perms = perms_p;
} else {
perms = AA_VALID_PTRACE_PERMS;
}
move_conditionals(conds);
free_cond_list(conds);
}
ostream &ptrace_rule::dump(ostream &os)
{
class_rule_t::dump(os);
/* override default perm dump */
if (perms != AA_VALID_PTRACE_PERMS) {
os << " (";
if (perms & AA_MAY_READ)
os << "read ";
if (perms & AA_MAY_READBY)
os << "readby ";
if (perms & AA_MAY_TRACE)
os << "trace ";
if (perms & AA_MAY_TRACEDBY)
os << "tracedby ";
os << ")";
}
if (peer_label)
os << " " << peer_label;
os << ",\n";
return os;
}
int ptrace_rule::expand_variables(void)
{
return expand_entry_variables(&peer_label);
}
void ptrace_rule::warn_once(const char *name)
{
rule_t::warn_once(name, "ptrace rules not enforced");
}
int ptrace_rule::gen_policy_re(Profile &prof)
{
std::ostringstream buffer;
std::string buf;
pattern_t ptype;
int pos;
/* ?? do we want to generate the rules in the policy so that it
* the compile could be used on another kernel unchanged??
* Current caching doesn't support this but in the future maybe
*/
if (!features_supports_ptrace) {
warn_once(prof.name);
return RULE_NOT_SUPPORTED;
}
/* always generate a label and ptrace entry */
buffer << "(" << "\\x" << std::setfill('0') << std::setw(2) << std::hex << AA_CLASS_LABEL << "|)";
buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << AA_CLASS_PTRACE;
if (peer_label) {
ptype = convert_aaregex_to_pcre(peer_label, 0, glob_default, buf, &pos);
if (ptype == ePatternInvalid)
goto fail;
buffer << buf;
} else {
buffer << anyone_match_pattern;
}
buf = buffer.str();
if (perms & AA_VALID_PTRACE_PERMS) {
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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