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Add new API to load sepolicy rule file

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This commit is contained in:
topjohnwu 2019-12-09 04:14:30 -05:00
parent 08177c3dd8
commit 490e6a6f23
7 changed files with 483 additions and 446 deletions
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3
native/jni/Android.mk
View File

@ -73,6 +73,7 @@ LOCAL_SRC_FILES := \
magiskpolicy/magiskpolicy.cpp \
magiskpolicy/rules.cpp \
magiskpolicy/policydb.cpp \
magiskpolicy/statement.cpp \
magiskpolicy/sepolicy.c
LOCAL_CFLAGS := -DAPPLET_STUB_MAIN=magiskpolicy_main
@ -97,7 +98,6 @@ ifdef BB_INIT
LOCAL_STATIC_LIBRARIES := libsepol libxz libutils
LOCAL_C_INCLUDES := \
jni/include \
jni/magiskpolicy \
$(EXT_PATH)/include \
out \
out/$(TARGET_ARCH_ABI) \
@ -113,6 +113,7 @@ LOCAL_SRC_FILES := \
magiskpolicy/magiskpolicy.cpp \
magiskpolicy/rules.cpp \
magiskpolicy/policydb.cpp \
magiskpolicy/statement.cpp \
magiskpolicy/sepolicy.c
LOCAL_LDFLAGS := -static

8
native/jni/magiskpolicy/magiskpolicy.h → native/jni/include/magiskpolicy.h
View File

@ -1,6 +1,3 @@
/* magiskpolicy.h - Public API for policy patching
*/
#pragma once
#include <stdlib.h>
@ -35,3 +32,8 @@ int sepol_exists(const char *source);
// Built in rules
void sepol_magisk_rules();
// Statement parsing
void parse_statement(const char *statement);
void load_rule_file(const char *file);
void statement_help();

3
native/jni/magiskpolicy/api.cpp
View File

@ -1,4 +1,5 @@
#include "magiskpolicy.h"
#include <magiskpolicy.h>
#include "sepolicy.h"
//#define vprint(fmt, ...) printf(fmt, __VA_ARGS__)

486
native/jni/magiskpolicy/magiskpolicy.cpp
View File

@ -1,459 +1,59 @@
/* magiskpolicy.cpp - Main function for policy patching
*
* Includes all the parsing logic for the policy statements
*/
#include <stdio.h>
#include <limits.h>
#include <vector>
#include <string>
#include <logging.h>
#include <utils.h>
#include <flags.h>
#include <magiskpolicy.h>
#include "sepolicy.h"
#include "magiskpolicy.h"
using namespace std;
static const char *type_msg_1 =
"Type 1:\n"
"\"<rule_name> source_type target_type class perm_set\"\n"
"Rules: allow, deny, auditallow, dontaudit\n";
static const char *type_msg_2 =
"Type 2:\n"
"\"<rule_name> source_type target_type class operation xperm_set\"\n"
"Rules: allowxperm, auditallowxperm, dontauditxperm\n"
"* The only supported operation is ioctl\n"
"* The only supported xperm_set format is range ([low-high])\n";
static const char *type_msg_3 =
"Type 3:\n"
"\"<rule_name> class\"\n"
"Rules: create, permissive, enforcing\n";
static const char *type_msg_4 =
"Type 4:\n"
"\"attradd class attribute\"\n";
static const char *type_msg_5 =
"Type 5:\n"
"\"<rule_name> source_type target_type class default_type\"\n"
"Rules: type_transition, type_change, type_member\n";
static const char *type_msg_6 =
"Type 6:\n"
"\"name_transition source_type target_type class default_type object_name\"\n";
[[noreturn]] static void statements() {
fprintf(stderr,
"One policy statement should be treated as one parameter;\n"
"this means a full policy statement should be enclosed in quotes;\n"
"multiple policy statements can be provided in a single command\n"
"\n"
"The statements has a format of \"<rule_name> [args...]\"\n"
"Multiple types and permissions can be grouped into collections\n"
"wrapped in curly brackets.\n"
"'*' represents a collection containing all valid matches.\n"
"\n"
"Supported policy statements:\n"
"\n"
"%s\n"
"%s\n"
"%s\n"
"%s\n"
"%s\n"
"%s\n"
"Notes:\n"
"* Type 4 - 6 does not support collections\n"
"* Object classes cannot be collections\n"
"* source_type and target_type can also be attributes\n"
"\n"
"Example: allow { s1 s2 } { t1 t2 } class *\n"
"Will be expanded to:\n"
"\n"
"allow s1 t1 class { all permissions }\n"
"allow s1 t2 class { all permissions }\n"
"allow s2 t1 class { all permissions }\n"
"allow s2 t2 class { all permissions }\n"
"\n",
type_msg_1, type_msg_2, type_msg_3, type_msg_4, type_msg_5, type_msg_6);
exit(0);
}
using namespace std::literals;
[[noreturn]] static void usage(char *arg0) {
fprintf(stderr,
FULL_VER(MagiskPolicy) "\n\n"
"Usage: %s [--options...] [policy statements...]\n"
"\n"
"Options:\n"
" --help show help message for policy statements\n"
" --load FILE load policies from FILE\n"
" --load-split load from preloaded sepolicy or compile\n"
" split policies\n"
" --compile-split compile split cil policies\n"
" --save FILE save policies to FILE\n"
" --live directly apply sepolicy live\n"
" --magisk inject built-in rules for a minimal\n"
" Magisk selinux environment\n"
"\n"
"If neither --load or --compile-split is specified, it will load\n"
"from current live policies (" SELINUX_POLICY ")\n"
"\n",
arg0);
FULL_VER(MagiskPolicy) R"EOF(
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);
}
static int parse_bracket(char *tok, char *&stmt, vector<const char *> *vec) {
if (tok == nullptr || tok[0] != '{') {
// Not in a bracket
vec->push_back(tok);
} else {
if (stmt)
stmt[-1] = ' ';
tok = strchr(tok, '{') + 1;
char *end = strchr(tok, '}');
if (end == nullptr) // Bracket not closed
return 1;
*end = '\0';
char *cur;
while ((cur = strtok_r(nullptr, " ", &tok)) != nullptr)
vec->push_back(cur);
stmt = end + 1;
}
return 0;
}
// Pattern 1: action { source } { target } class { permission }
static int parse_pattern_1(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_allow;
break;
case 1:
action_func = sepol_deny;
break;
case 2:
action_func = sepol_auditallow;
break;
case 3:
action_func = sepol_dontaudit;
break;
default:
return 1;
}
int state = 0;
char *cur, *cls;
vector<const char*> source, target, permission;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &source;
break;
case 1:
vec = &target;
break;
case 2:
vec = nullptr;
cls = cur;
break;
case 3:
vec = &permission;
break;
default:
return 1;
}
if (vec && parse_bracket(cur, stmt, vec))
return 1;
++state;
}
if (state != 4 || source.empty() || target.empty() || permission.empty())
return 1;
for (auto src : source)
for (auto tgt : target)
for (auto perm : permission)
if (action_func(src, tgt, cls, perm))
fprintf(stderr, "Error in: %s %s %s %s %s\n", action_str, src, tgt, cls, perm);
return 0;
}
// Pattern 2: action { source } { target } { class } ioctl range
static int parse_pattern_2(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_allowxperm;
break;
case 1:
action_func = sepol_auditallowxperm;
break;
case 2:
action_func = sepol_dontauditxperm;
break;
default:
return 1;
}
int state = 0;
char *cur, *range;
vector<const char *> source, target, classes;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &source;
break;
case 1:
vec = &target;
break;
case 2:
vec = &classes;
break;
case 3:
// Currently only support ioctl
if (strcmp(cur, "ioctl") != 0)
return 1;
vec = nullptr;
break;
case 4:
vec = nullptr;
range = cur;
break;
default:
return 1;
}
if (vec && parse_bracket(cur, stmt, vec))
return 1;
++state;
}
if (state != 5 || source.empty() || target.empty() || classes.empty())
return 1;
for (auto src : source)
for (auto tgt : target)
for (auto cls : classes)
if (action_func(src, tgt, cls, range))
fprintf(stderr, "Error in: %s %s %s %s %s\n", action_str, src, tgt, cls, range);
return 0;
}
// Pattern 3: action { type }
static int parse_pattern_3(int action, const char *action_str, char* stmt) {
int (*action_func)(const char*);
switch (action) {
case 0:
action_func = sepol_create;
break;
case 1:
action_func = sepol_permissive;
break;
case 2:
action_func = sepol_enforce;
break;
default:
return 1;
}
char *cur;
vector<const char *> domains;
while ((cur = strtok_r(nullptr, " {}", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
domains.push_back(cur);
}
if (domains.empty())
return 1;
for (auto dom : domains)
if (action_func(dom))
fprintf(stderr, "Error in: %s %s\n", action_str, dom);
return 0;
}
// Pattern 4: action { class } { attribute }
static int parse_pattern_4(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*);
switch (action) {
case 0:
action_func = sepol_attradd;
break;
default:
return 1;
}
int state = 0;
char *cur;
vector<const char *> classes, attribute;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &classes;
break;
case 1:
vec = &attribute;
break;
default:
return 1;
}
if (parse_bracket(cur, stmt, vec))
return 1;
++state;
}
if (state != 2 || classes.empty() || attribute.empty())
return 1;
for (auto cls : classes)
for (auto attr : attribute)
if (action_func(cls, attr))
fprintf(stderr, "Error in: %s %s %s\n", action_str, cls, attr);
return 0;
}
// Pattern 5: action source target class default
static int parse_pattern_5(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_typetrans;
break;
case 1:
action_func = sepol_typechange;
break;
case 2:
action_func = sepol_typemember;
break;
default:
return 1;
}
int state = 0;
char *cur;
char *source, *target, *cls, *def;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
switch(state) {
case 0:
source = cur;
break;
case 1:
target = cur;
break;
case 2:
cls = cur;
break;
case 3:
def = cur;
break;
default:
return 1;
}
++state;
}
if (state < 4) return 1;
if (action_func(source, target, cls, def))
fprintf(stderr, "Error in: %s %s %s %s %s\n", action_str, source, target, cls, def);
return 0;
}
// Pattern 6: action source target class default filename
static int parse_pattern_6(int action, const char *action_str, char *stmt) {
int state = 0;
char *cur;
char *source, *target, *cls, *def, *filename;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
switch(state) {
case 0:
source = cur;
break;
case 1:
target = cur;
break;
case 2:
cls = cur;
break;
case 3:
def = cur;
break;
case 4:
filename = cur;
break;
default:
return 1;
}
++state;
}
if (state < 4) return 1;
if (sepol_nametrans(source, target, cls, def, filename))
fprintf(stderr, "Error in: %s %s %s %s %s %s\n",
action_str, source, target, cls, def, filename);
return 0;
}
#define add_action(name, type, num) \
else if (strcmp(name, action) == 0) { \
if (parse_pattern_##type(num, name, remain)) \
fprintf(stderr, "Syntax error in '%s'\n\n%s\n", orig.c_str(), type_msg_##type); \
}
static void parse_statement(char *statement) {
char *action, *remain;
// strtok will modify the origin string, duplicate the statement for error messages
string orig(statement);
action = strtok_r(statement, " ", &remain);
if (remain == nullptr) remain = &action[strlen(action)];
if (0) {}
add_action("allow", 1, 0)
add_action("deny", 1, 1)
add_action("auditallow", 1, 2)
add_action("dontaudit", 1, 3)
add_action("allowxperm", 2, 0)
add_action("auditallowxperm", 2, 1)
add_action("dontauditxperm", 2, 2)
add_action("create", 3, 0)
add_action("permissive", 3, 1)
add_action("enforce", 3, 2)
add_action("attradd", 4, 0)
add_action("type_transition", 5, 0)
add_action("type_change", 5, 1)
add_action("type_member", 5, 2)
add_action("name_transition", 6, 0)
else { fprintf(stderr, "Unknown statement: '%s'\n\n", orig.c_str()); }
}
int magiskpolicy_main(int argc, char *argv[]) {
cmdline_logging();
const char *outfile = nullptr;
bool magisk = false, live = false;
const char *out_file = nullptr;
const char *rule_file = 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] == '-') {
if (strcmp(argv[i] + 2, "live") == 0)
auto option = argv[i] + 2;
if (option == "live"sv)
live = true;
else if (strcmp(argv[i] + 2, "magisk") == 0)
else if (option == "magisk"sv)
magisk = true;
else if (strcmp(argv[i] + 2, "load") == 0) {
else if (option == "load"sv) {
if (argv[i + 1] == nullptr)
usage(argv[0]);
if (load_policydb(argv[i + 1])) {
@ -461,23 +61,28 @@ int magiskpolicy_main(int argc, char *argv[]) {
return 1;
}
++i;
} else if (strcmp(argv[i] + 2, "load-split") == 0) {
} else if (option == "load-split"sv) {
if (load_split_cil()) {
fprintf(stderr, "Cannot load split cil\n");
return 1;
}
} else if (strcmp(argv[i] + 2, "compile-split") == 0) {
} else if (option == "compile-split"sv) {
if (compile_split_cil()) {
fprintf(stderr, "Cannot compile split cil\n");
return 1;
}
} else if (strcmp(argv[i] + 2, "save") == 0) {
} else if (option == "save"sv) {
if (argv[i + 1] == nullptr)
usage(argv[0]);
outfile = argv[i + 1];
out_file = argv[i + 1];
++i;
} else if (strcmp(argv[i] + 2, "help") == 0) {
statements();
} 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]);
}
@ -495,6 +100,9 @@ int magiskpolicy_main(int argc, char *argv[]) {
if (magisk)
sepol_magisk_rules();
if (rule_file)
load_rule_file(rule_file);
for (; i < argc; ++i)
parse_statement(argv[i]);
@ -503,8 +111,8 @@ int magiskpolicy_main(int argc, char *argv[]) {
return 1;
}
if (outfile && dump_policydb(outfile)) {
fprintf(stderr, "Cannot dump policy to %s\n", outfile);
if (out_file && dump_policydb(out_file)) {
fprintf(stderr, "Cannot dump policy to %s\n", out_file);
return 1;
}

2
native/jni/magiskpolicy/policydb.cpp
View File

@ -8,8 +8,8 @@
#include <utils.h>
#include <logging.h>
#include <stream.h>
#include <magiskpolicy.h>
#include "magiskpolicy.h"
#include "sepolicy.h"
int load_policydb(const char *file) {

2
native/jni/magiskpolicy/rules.cpp
View File

@ -1,7 +1,7 @@
#include <logging.h>
#include <flags.h>
#include <magiskpolicy.h>
#include "magiskpolicy.h"
#include "sepolicy.h"
static void allowSuClient(const char *target) {

425
native/jni/magiskpolicy/statement.cpp Normal file
View File

@ -0,0 +1,425 @@
#include <cstring>
#include <vector>
#include <string>
#include <magiskpolicy.h>
#include <logging.h>
#include <utils.h>
using namespace std;
static const char *type_msg_1 =
R"EOF(Type 1:
"<rule_name> source_type target_type class perm_set"
Rules: allow, deny, auditallow, dontaudit
)EOF";
static const char *type_msg_2 =
R"EOF(Type 2:
"<rule_name> source_type target_type class operation xperm_set"
Rules: allowxperm, auditallowxperm, dontauditxperm
* The only supported operation is ioctl
* The only supported xperm_set format is range ([low-high])
)EOF";
static const char *type_msg_3 =
R"EOF(Type 3:
"<rule_name> class"
Rules: create, permissive, enforcing
)EOF";
static const char *type_msg_4 =
R"EOF(Type 4:
"attradd class attribute"
)EOF";
static const char *type_msg_5 =
R"EOF(Type 5:
"<rule_name> source_type target_type class default_type"
Rules: type_transition, type_change, type_member
)EOF";
static const char *type_msg_6 =
R"EOF(Type 6:
"name_transition source_type target_type class default_type object_name"
)EOF";
void statement_help() {
fprintf(stderr,
R"EOF(One policy statement should be treated as one parameter;
this means a full policy statement should be enclosed in quotes.
Multiple policy statements can be provided in a single command.
The statements has a format of "<rule_name> [args...]"
Multiple types and permissions can be grouped into collections
wrapped in curly brackets.
'*' represents a collection containing all valid matches.
Supported policy statements:
%s
%s
%s
%s
%s
%s
Notes:
* Type 4 - 6 does not support collections
* Object classes cannot be collections
* source_type and target_type can also be attributes
Example: allow { s1 s2 } { t1 t2 } class *
Will be expanded to:
allow s1 t1 class { all-permissions }
allow s1 t2 class { all-permissions }
allow s2 t1 class { all-permissions }
allow s2 t2 class { all-permissions }
)EOF", type_msg_1, type_msg_2, type_msg_3, type_msg_4, type_msg_5, type_msg_6);
exit(0);
}
static int parse_bracket(char *tok, char *&stmt, vector<const char *> &vec) {
if (tok == nullptr || tok[0] != '{') {
// Not in a bracket
vec.push_back(tok);
} else {
if (stmt)
stmt[-1] = ' ';
tok = strchr(tok, '{') + 1;
char *end = strchr(tok, '}');
if (end == nullptr) // Bracket not closed
return 1;
*end = '\0';
char *cur;
while ((cur = strtok_r(nullptr, " ", &tok)) != nullptr)
vec.push_back(cur);
stmt = end + 1;
}
return 0;
}
// Pattern 1: action { source } { target } class { permission }
static int parse_pattern_1(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_allow;
break;
case 1:
action_func = sepol_deny;
break;
case 2:
action_func = sepol_auditallow;
break;
case 3:
action_func = sepol_dontaudit;
break;
default:
return 1;
}
int state = 0;
char *cur, *cls;
vector<const char*> source, target, permission;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &source;
break;
case 1:
vec = &target;
break;
case 2:
vec = nullptr;
cls = cur;
break;
case 3:
vec = &permission;
break;
default:
return 1;
}
if (vec && parse_bracket(cur, stmt, *vec))
return 1;
++state;
}
if (state != 4 || source.empty() || target.empty() || permission.empty())
return 1;
for (auto src : source)
for (auto tgt : target)
for (auto perm : permission)
if (action_func(src, tgt, cls, perm))
LOGW("Error in: %s %s %s %s %s\n", action_str, src, tgt, cls, perm);
return 0;
}
// Pattern 2: action { source } { target } { class } ioctl range
static int parse_pattern_2(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_allowxperm;
break;
case 1:
action_func = sepol_auditallowxperm;
break;
case 2:
action_func = sepol_dontauditxperm;
break;
default:
return 1;
}
int state = 0;
char *cur, *range;
vector<const char *> source, target, classes;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &source;
break;
case 1:
vec = &target;
break;
case 2:
vec = &classes;
break;
case 3:
// Currently only support ioctl
if (strcmp(cur, "ioctl") != 0)
return 1;
vec = nullptr;
break;
case 4:
vec = nullptr;
range = cur;
break;
default:
return 1;
}
if (vec && parse_bracket(cur, stmt, *vec))
return 1;
++state;
}
if (state != 5 || source.empty() || target.empty() || classes.empty())
return 1;
for (auto src : source)
for (auto tgt : target)
for (auto cls : classes)
if (action_func(src, tgt, cls, range))
LOGW("Error in: %s %s %s %s %s\n", action_str, src, tgt, cls, range);
return 0;
}
// Pattern 3: action { type }
static int parse_pattern_3(int action, const char *action_str, char* stmt) {
int (*action_func)(const char*);
switch (action) {
case 0:
action_func = sepol_create;
break;
case 1:
action_func = sepol_permissive;
break;
case 2:
action_func = sepol_enforce;
break;
default:
return 1;
}
char *cur;
vector<const char *> domains;
while ((cur = strtok_r(nullptr, " {}", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
domains.push_back(cur);
}
if (domains.empty())
return 1;
for (auto dom : domains)
if (action_func(dom))
LOGW("Error in: %s %s\n", action_str, dom);
return 0;
}
// Pattern 4: action { class } { attribute }
static int parse_pattern_4(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*);
switch (action) {
case 0:
action_func = sepol_attradd;
break;
default:
return 1;
}
int state = 0;
char *cur;
vector<const char *> classes, attribute;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
if (cur[0] == '*') cur = ALL;
vector<const char *> *vec;
switch (state) {
case 0:
vec = &classes;
break;
case 1:
vec = &attribute;
break;
default:
return 1;
}
if (parse_bracket(cur, stmt, *vec))
return 1;
++state;
}
if (state != 2 || classes.empty() || attribute.empty())
return 1;
for (auto cls : classes)
for (auto attr : attribute)
if (action_func(cls, attr))
LOGW("Error in: %s %s %s\n", action_str, cls, attr);
return 0;
}
// Pattern 5: action source target class default
static int parse_pattern_5(int action, const char *action_str, char *stmt) {
int (*action_func)(const char*, const char*, const char*, const char*);
switch (action) {
case 0:
action_func = sepol_typetrans;
break;
case 1:
action_func = sepol_typechange;
break;
case 2:
action_func = sepol_typemember;
break;
default:
return 1;
}
int state = 0;
char *cur;
char *source, *target, *cls, *def;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
switch(state) {
case 0:
source = cur;
break;
case 1:
target = cur;
break;
case 2:
cls = cur;
break;
case 3:
def = cur;
break;
default:
return 1;
}
++state;
}
if (state < 4) return 1;
if (action_func(source, target, cls, def))
LOGW("Error in: %s %s %s %s %s\n", action_str, source, target, cls, def);
return 0;
}
// Pattern 6: action source target class default filename
static int parse_pattern_6(int action, const char *action_str, char *stmt) {
int state = 0;
char *cur;
char *source, *target, *cls, *def, *filename;
while ((cur = strtok_r(nullptr, " ", &stmt)) != nullptr) {
switch(state) {
case 0:
source = cur;
break;
case 1:
target = cur;
break;
case 2:
cls = cur;
break;
case 3:
def = cur;
break;
case 4:
filename = cur;
break;
default:
return 1;
}
++state;
}
if (state < 4) return 1;
if (sepol_nametrans(source, target, cls, def, filename))
LOGW("Error in: %s %s %s %s %s %s\n", action_str, source, target, cls, def, filename);
return 0;
}
#define add_action(name, type, num) \
else if (strcmp(name, action) == 0) { \
if (parse_pattern_##type(num, name, remain)) \
LOGW("Syntax error in '%s'\n\n%s\n", statement, type_msg_##type); \
}
void parse_statement(const char *statement) {
char *action, *remain;
// strtok will modify strings, duplicate the statement
string stmt(statement);
action = strtok_r(stmt.data(), " ", &remain);
if (remain == nullptr) {
LOGE("Syntax error in '%s'\n\n", statement);
return;
}
if (0) {}
add_action("allow", 1, 0)
add_action("deny", 1, 1)
add_action("auditallow", 1, 2)
add_action("dontaudit", 1, 3)
add_action("allowxperm", 2, 0)
add_action("auditallowxperm", 2, 1)
add_action("dontauditxperm", 2, 2)
add_action("create", 3, 0)
add_action("permissive", 3, 1)
add_action("enforce", 3, 2)
add_action("attradd", 4, 0)
add_action("type_transition", 5, 0)
add_action("type_change", 5, 1)
add_action("type_member", 5, 2)
add_action("name_transition", 6, 0)
else { LOGW("Unknown statement: '%s'\n\n", statement); }
}
void load_rule_file(const char *file) {
file_readline(file, [](string_view line) -> bool {
if (line.empty() || line[0] == '#')
return true;
parse_statement(line.data());
return true;
}, true);
}