499 lines
13 KiB
C
499 lines
13 KiB
C
/* magiskpolicy.c - Main function for policy patching
|
|
*
|
|
* Includes all the parsing logic for the policy statements
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "sepolicy.h"
|
|
#include "vector.h"
|
|
#include "magiskpolicy.h"
|
|
#include "magisk.h"
|
|
|
|
static int syntax_err = 0;
|
|
static char err_msg[ARG_MAX];
|
|
|
|
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 \"<action> [args...]\"\n"
|
|
"Use '*' in args to represent every possible match.\n"
|
|
"Collections wrapped in curly brackets can also be used as args.\n"
|
|
"\n"
|
|
"Supported policy statements:\n"
|
|
"\n"
|
|
"Type 1:\n"
|
|
"\"<action> source-class target-class permission-class permission\"\n"
|
|
"Action: allow, deny, auditallow, auditdeny\n"
|
|
"\n"
|
|
"Type 2:\n"
|
|
"\"<action> source-class target-class permission-class ioctl range\"\n"
|
|
"Action: allowxperm, auditallowxperm, dontauditxperm\n"
|
|
"\n"
|
|
"Type 3:\n"
|
|
"\"<action> class\"\n"
|
|
"Action: create, permissive, enforcing\n"
|
|
"\n"
|
|
"Type 4:\n"
|
|
"\"attradd class attribute\"\n"
|
|
"\n"
|
|
"Type 5:\n"
|
|
"\"typetrans source-class target-class permission-class default-class (optional: object-name)\"\n"
|
|
"\n"
|
|
"Notes:\n"
|
|
"- typetrans does not support the all match '*' syntax\n"
|
|
"- permission-class cannot be collections\n"
|
|
"- source-class and target-class can also be attributes\n"
|
|
"\n"
|
|
"Example: allow { source1 source2 } { target1 target2 } permission-class *\n"
|
|
"Will be expanded to:\n"
|
|
"\n"
|
|
"allow source1 target1 permission-class { all-permissions }\n"
|
|
"allow source1 target2 permission-class { all-permissions }\n"
|
|
"allow source2 target1 permission-class { all-permissions }\n"
|
|
"allow source2 target2 permission-class { all-permissions }\n"
|
|
"\n"
|
|
);
|
|
}
|
|
|
|
static void usage(char *arg0) {
|
|
fprintf(stderr,
|
|
"MagiskPolicy v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") (by topjohnwu)\n\n"
|
|
"Usage: %s [--options...] [policy statements...]\n"
|
|
"\n"
|
|
"Options:\n"
|
|
" --live directly apply sepolicy live\n"
|
|
" --magisk inject built-in rules for a Magisk\n"
|
|
" selinux environment\n"
|
|
" --load FILE load policies from FILE\n"
|
|
" --compile-split compile and load split cil policies\n"
|
|
" from system and vendor just like init\n"
|
|
" --save FILE save policies to FILE\n"
|
|
"\n"
|
|
"If neither --load or --compile-split is specified, it will load\n"
|
|
"from current live policies (" SELINUX_POLICY ")\n"
|
|
"\n"
|
|
, arg0);
|
|
statements();
|
|
exit(1);
|
|
}
|
|
|
|
// Pattern 1: action { source } { target } class { permission }
|
|
static int parse_pattern_1(int action, char* statement) {
|
|
int state = 0, in_bracket = 0;
|
|
char *tok, *class, *saveptr;
|
|
struct vector source, target, permission;
|
|
vec_init(&source);
|
|
vec_init(&target);
|
|
vec_init(&permission);
|
|
tok = strtok_r(statement, " ", &saveptr);
|
|
while (tok != NULL) {
|
|
if (tok[0] == '{') {
|
|
if (in_bracket || state == 2) return 1;
|
|
in_bracket = 1;
|
|
if (tok[1]) {
|
|
++tok;
|
|
continue;
|
|
}
|
|
} else if (tok[strlen(tok) - 1] == '}') {
|
|
if (!in_bracket || state == 2) return 1;
|
|
in_bracket = 0;
|
|
if (strlen(tok) - 1) {
|
|
tok[strlen(tok) - 1] = '\0';
|
|
continue;
|
|
}
|
|
} else {
|
|
if (tok[0] == '*') tok = ALL;
|
|
struct vector *vec;
|
|
switch (state) {
|
|
case 0:
|
|
vec = &source;
|
|
break;
|
|
case 1:
|
|
vec = ⌖
|
|
break;
|
|
case 2:
|
|
vec = NULL;
|
|
class = tok;
|
|
break;
|
|
case 3:
|
|
vec = &permission;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
vec_push_back(vec, tok);
|
|
}
|
|
if (!in_bracket) ++state;
|
|
tok = strtok_r(NULL, " ", &saveptr);
|
|
}
|
|
if (state != 4) return 1;
|
|
for(int i = 0; i < source.size; ++i)
|
|
for (int j = 0; j < target.size; ++j)
|
|
for (int k = 0; k < permission.size; ++k) {
|
|
int (*action_func)(char*, char*, char*, char*);
|
|
char *action_str;
|
|
switch (action) {
|
|
case 0:
|
|
action_func = sepol_allow;
|
|
action_str = "allow";
|
|
break;
|
|
case 1:
|
|
action_func = sepol_deny;
|
|
action_str = "deny";
|
|
break;
|
|
case 2:
|
|
action_func = sepol_auditallow;
|
|
action_str = "auditallow";
|
|
break;
|
|
case 3:
|
|
action_func = sepol_auditdeny;
|
|
action_str = "auditdeny";
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
if (action_func(source.data[i], target.data[j], class, permission.data[k]))
|
|
fprintf(stderr, "Error in: %s %s %s %s %s\n",
|
|
action_str, (char *) source.data[i], (char *) target.data[j], class, (char *) permission.data[k]);
|
|
}
|
|
vec_destroy(&source);
|
|
vec_destroy(&target);
|
|
vec_destroy(&permission);
|
|
return 0;
|
|
}
|
|
|
|
// Pattern 2: action { class } { attribute }
|
|
static int parse_pattern_2(int action, char* statement) {
|
|
int state = 0, in_bracket = 0;
|
|
char *tok, *saveptr;
|
|
struct vector class, attribute;
|
|
vec_init(&class);
|
|
vec_init(&attribute);
|
|
tok = strtok_r(statement, " ", &saveptr);
|
|
while (tok != NULL) {
|
|
if (tok[0] == '{') {
|
|
if (in_bracket) return 1;
|
|
in_bracket = 1;
|
|
if (tok[1]) {
|
|
++tok;
|
|
continue;
|
|
}
|
|
} else if (tok[strlen(tok) - 1] == '}') {
|
|
if (!in_bracket) return 1;
|
|
in_bracket = 0;
|
|
if (strlen(tok) - 1) {
|
|
tok[strlen(tok) - 1] = '\0';
|
|
continue;
|
|
}
|
|
} else {
|
|
if (tok[0] == '*') tok = ALL;
|
|
struct vector *vec;
|
|
switch (state) {
|
|
case 0:
|
|
vec = &class;
|
|
break;
|
|
case 1:
|
|
vec = &attribute;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
vec_push_back(vec, tok);
|
|
}
|
|
if (!in_bracket) ++state;
|
|
tok = strtok_r(NULL, " ", &saveptr);
|
|
}
|
|
if (state != 2) return 1;
|
|
for(int i = 0; i < class.size; ++i)
|
|
for (int j = 0; j < attribute.size; ++j) {
|
|
int (*action_func)(char*, char*);
|
|
char *action_str;
|
|
switch (action) {
|
|
case 0:
|
|
action_func = sepol_attradd;
|
|
action_str = "attradd";
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
if (action_func(class.data[i], attribute.data[j]))
|
|
fprintf(stderr, "Error in: %s %s %s\n",
|
|
action_str, (char *) class.data[i], (char *) attribute.data[j]);
|
|
}
|
|
vec_destroy(&class);
|
|
vec_destroy(&attribute);
|
|
return 0;
|
|
}
|
|
|
|
// Pattern 3: action { type }
|
|
static int parse_pattern_3(int action, char* statement) {
|
|
char *tok, *saveptr;
|
|
struct vector classes;
|
|
vec_init(&classes);
|
|
tok = strtok_r(statement, " {}", &saveptr);
|
|
while (tok != NULL) {
|
|
if (tok[0] == '*') tok = ALL;
|
|
vec_push_back(&classes, tok);
|
|
tok = strtok_r(NULL, " {}", &saveptr);
|
|
}
|
|
for (int i = 0; i < classes.size; ++i) {
|
|
int (*action_func)(char*);
|
|
char *action_str;
|
|
switch (action) {
|
|
case 0:
|
|
action_func = sepol_create;
|
|
action_str = "create";
|
|
break;
|
|
case 1:
|
|
action_func = sepol_permissive;
|
|
action_str = "permissive";
|
|
break;
|
|
case 2:
|
|
action_func = sepol_enforce;
|
|
action_str = "enforce";
|
|
break;
|
|
}
|
|
if (action_func(classes.data[i]))
|
|
fprintf(stderr, "Error in: %s %s\n", action_str, (char *) classes.data[i]);
|
|
}
|
|
vec_destroy(&classes);
|
|
return 0;
|
|
}
|
|
|
|
// Pattern 4: action source target class default (filename)
|
|
static int parse_pattern_4(int action, char* statement) {
|
|
int state = 0;
|
|
char *tok, *saveptr;
|
|
char *source, *target, *class, *def, *filename = NULL;
|
|
tok = strtok_r(statement, " ", &saveptr);
|
|
while (tok != NULL) {
|
|
switch(state) {
|
|
case 0:
|
|
source = tok;
|
|
break;
|
|
case 1:
|
|
target = tok;
|
|
break;
|
|
case 2:
|
|
class = tok;
|
|
break;
|
|
case 3:
|
|
def = tok;
|
|
break;
|
|
case 4:
|
|
filename = tok;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
tok = strtok_r(NULL, " ", &saveptr);
|
|
++state;
|
|
}
|
|
if (state < 4) return 1;
|
|
if (sepol_typetrans(source, target, class, def, filename))
|
|
fprintf(stderr, "Error in: typetrans %s %s %s %s %s\n", source, target, class, def, filename ? filename : "");
|
|
return 0;
|
|
}
|
|
|
|
// Pattern 5: action { source } { target } { class } ioctl range
|
|
static int parse_pattern_5(int action, char* statement) {
|
|
int state = 0, in_bracket = 0;
|
|
char *tok, *range, *saveptr;
|
|
struct vector source, target, class;
|
|
vec_init(&source);
|
|
vec_init(&target);
|
|
vec_init(&class);
|
|
tok = strtok_r(statement, " ", &saveptr);
|
|
while (tok != NULL) {
|
|
if (tok[0] == '{') {
|
|
if (in_bracket || state == 3 || state == 4) return 1;
|
|
in_bracket = 1;
|
|
if (tok[1]) {
|
|
++tok;
|
|
continue;
|
|
}
|
|
} else if (tok[strlen(tok) - 1] == '}') {
|
|
if (!in_bracket || state == 3 || state == 4) return 1;
|
|
in_bracket = 0;
|
|
if (strlen(tok) - 1) {
|
|
tok[strlen(tok) - 1] = '\0';
|
|
continue;
|
|
}
|
|
} else {
|
|
if (tok[0] == '*') tok = ALL;
|
|
struct vector *vec;
|
|
switch (state) {
|
|
case 0:
|
|
vec = &source;
|
|
break;
|
|
case 1:
|
|
vec = ⌖
|
|
break;
|
|
case 2:
|
|
vec = &class;
|
|
break;
|
|
case 3:
|
|
// Should always be ioctl
|
|
vec = NULL;
|
|
break;
|
|
case 4:
|
|
vec = NULL;
|
|
range = tok;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
vec_push_back(vec, tok);
|
|
}
|
|
if (!in_bracket) ++state;
|
|
tok = strtok_r(NULL, " ", &saveptr);
|
|
}
|
|
if (state != 5) return 1;
|
|
for(int i = 0; i < source.size; ++i)
|
|
for (int j = 0; j < target.size; ++j)
|
|
for (int k = 0; k < class.size; ++k) {
|
|
int (*action_func)(char*, char*, char*, char*);
|
|
char *action_str;
|
|
switch (action) {
|
|
case 0:
|
|
action_func = sepol_allowxperm;
|
|
action_str = "allowxperm";
|
|
break;
|
|
case 1:
|
|
action_func = sepol_auditallowxperm;
|
|
action_str = "auditallowxperm";
|
|
break;
|
|
case 2:
|
|
action_func = sepol_dontauditxperm;
|
|
action_str = "dontauditxperm";
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
if (action_func(source.data[i], target.data[j], class.data[k], range))
|
|
fprintf(stderr, "Error in: %s %s %s %s %s\n",
|
|
action_str, (char *) source.data[i], (char *) target.data[j], (char *) class.data[k], range);
|
|
}
|
|
vec_destroy(&source);
|
|
vec_destroy(&target);
|
|
vec_destroy(&class);
|
|
return 0;
|
|
}
|
|
|
|
static void syntax_error_msg() {
|
|
fprintf(stderr, "Syntax error in \"%s\"\n", err_msg);
|
|
syntax_err = 1;
|
|
}
|
|
|
|
int magiskpolicy_main(int argc, char *argv[]) {
|
|
char *outfile = NULL, *tok, *saveptr;
|
|
int magisk = 0;
|
|
struct vector rules;
|
|
|
|
vec_init(&rules);
|
|
|
|
if (argc < 2) usage(argv[0]);
|
|
for (int i = 1; i < argc; ++i) {
|
|
if (argv[i][0] == '-' && argv[i][1] == '-') {
|
|
if (strcmp(argv[i] + 2, "live") == 0)
|
|
outfile = SELINUX_LOAD;
|
|
else if (strcmp(argv[i] + 2, "magisk") == 0)
|
|
magisk = 1;
|
|
else if (strcmp(argv[i] + 2, "load") == 0) {
|
|
if (i + 1 >= argc)
|
|
usage(argv[0]);
|
|
if (load_policydb(argv[i + 1])) {
|
|
fprintf(stderr, "Cannot load policy from %s\n", argv[i + 1]);
|
|
return 1;
|
|
}
|
|
++i;
|
|
} else if (strcmp(argv[i] + 2, "compile-split") == 0) {
|
|
if (compile_split_cil()) {
|
|
fprintf(stderr, "Cannot compile split cil\n");
|
|
return 1;
|
|
}
|
|
} else if (strcmp(argv[i] + 2, "save") == 0) {
|
|
if (i + 1 >= argc)
|
|
usage(argv[0]);
|
|
outfile = argv[i + 1];
|
|
++i;
|
|
} else {
|
|
usage(argv[0]);
|
|
}
|
|
} else {
|
|
vec_push_back(&rules, argv[i]);
|
|
}
|
|
}
|
|
|
|
// Use current policy if nothing is loaded
|
|
if(policydb == NULL && load_policydb(SELINUX_POLICY)) {
|
|
fprintf(stderr, "Cannot load policy from " SELINUX_POLICY "\n");
|
|
return 1;
|
|
}
|
|
|
|
if (magisk)
|
|
sepol_magisk_rules();
|
|
|
|
for (int i = 0; i < rules.size; ++i) {
|
|
// Since strtok will modify the origin string, copy the policy for error messages
|
|
strcpy(err_msg, rules.data[i]);
|
|
tok = strtok_r(rules.data[i], " ", &saveptr);
|
|
if (strcmp(tok, "allow") == 0) {
|
|
if (parse_pattern_1(0, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "deny") == 0) {
|
|
if (parse_pattern_1(1, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "auditallow") == 0) {
|
|
if (parse_pattern_1(2, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "auditdeny") == 0) {
|
|
if (parse_pattern_1(3, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "attradd") == 0) {
|
|
if (parse_pattern_2(0, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "create") == 0) {
|
|
if (parse_pattern_3(0, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "permissive") == 0) {
|
|
if (parse_pattern_3(1, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "enforce") == 0) {
|
|
if (parse_pattern_3(2, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "typetrans") == 0) {
|
|
if (parse_pattern_4(0, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "allowxperm") == 0) {
|
|
if (parse_pattern_5(0, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "auditallowxperm") == 0) {
|
|
if (parse_pattern_5(1, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else if (strcmp(tok, "dontauditxperm") == 0) {
|
|
if (parse_pattern_5(2, rules.data[i] + strlen(tok) + 1))
|
|
syntax_error_msg();
|
|
} else {
|
|
syntax_error_msg();
|
|
}
|
|
}
|
|
|
|
if (syntax_err)
|
|
statements();
|
|
|
|
vec_destroy(&rules);
|
|
|
|
if (outfile && dump_policydb(outfile)) {
|
|
fprintf(stderr, "Cannot dump policy to %s\n", outfile);
|
|
return 1;
|
|
}
|
|
|
|
destroy_policydb();
|
|
return 0;
|
|
}
|