Magisk/native/jni/magiskpolicy/magiskpolicy.cpp

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#include <utils.hpp>
#include <magiskpolicy.hpp>
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#include "sepolicy.hpp"
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using namespace std::literals;
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[[noreturn]] static void usage(char *arg0) {
fprintf(stderr,
R"EOF(MagiskPolicy - Sepolicy Patch Tool
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Usage: %s [--options...] [policy statements...]
Options:
--help show help message for policy statements
--load FILE load policies from FILE
--load-split load from precompiled sepolicy or compile
split policies
--compile-split compile split cil policies
--save FILE save policies to FILE
--live directly apply sepolicy live
--magisk inject built-in rules for a minimal
Magisk selinux environment
--apply FILE apply rules from FILE, read and parsed
line by line as policy statements
If neither --load or --compile-split is specified, it will load
from current live policies (/sys/fs/selinux/policy)
)EOF", arg0);
exit(1);
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}
int magiskpolicy_main(int argc, char *argv[]) {
cmdline_logging();
const char *out_file = nullptr;
const char *rule_file = nullptr;
sepolicy *sepol = nullptr;
bool magisk = false;
bool live = false;
if (argc < 2) usage(argv[0]);
int i = 1;
for (; i < argc; ++i) {
// Parse options
if (argv[i][0] == '-' && argv[i][1] == '-') {
auto option = argv[i] + 2;
if (option == "live"sv)
live = true;
else if (option == "magisk"sv)
magisk = true;
else if (option == "load"sv) {
if (argv[i + 1] == nullptr)
usage(argv[0]);
sepol = sepolicy::from_file(argv[i + 1]);
if (!sepol) {
fprintf(stderr, "Cannot load policy from %s\n", argv[i + 1]);
return 1;
}
++i;
} else if (option == "load-split"sv) {
sepol = sepolicy::from_split();
if (!sepol) {
fprintf(stderr, "Cannot load split cil\n");
return 1;
}
} else if (option == "compile-split"sv) {
sepol = sepolicy::compile_split();
if (!sepol) {
fprintf(stderr, "Cannot compile split cil\n");
return 1;
}
} else if (option == "save"sv) {
if (argv[i + 1] == nullptr)
usage(argv[0]);
out_file = argv[i + 1];
++i;
} else if (option == "apply"sv) {
if (argv[i + 1] == nullptr)
usage(argv[0]);
rule_file = argv[i + 1];
++i;
} else if (option == "help"sv) {
statement_help();
} else {
usage(argv[0]);
}
} else {
break;
}
}
// Use current policy if nothing is loaded
if (sepol == nullptr && !(sepol = sepolicy::from_file(SELINUX_POLICY))) {
fprintf(stderr, "Cannot load policy from " SELINUX_POLICY "\n");
return 1;
}
if (magisk)
sepol->magisk_rules();
if (rule_file)
sepol->load_rule_file(rule_file);
for (; i < argc; ++i)
sepol->parse_statement(argv[i]);
if (live && !sepol->to_file(SELINUX_LOAD)) {
fprintf(stderr, "Cannot apply policy\n");
return 1;
}
if (out_file && !sepol->to_file(out_file)) {
fprintf(stderr, "Cannot dump policy to %s\n", out_file);
return 1;
}
delete sepol;
return 0;
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}