365 lines
10 KiB
C
365 lines
10 KiB
C
/* magiskpolicy.c - Main function for policy patching
|
|
*
|
|
* Includes all the parsing logic for the policy statements
|
|
*/
|
|
|
|
#ifdef INDEP_BINARY
|
|
int magiskpolicy_main(int argc, char *argv[]);
|
|
int main(int argc, char *argv[]) {
|
|
return magiskpolicy_main(argc, argv);
|
|
}
|
|
#else
|
|
#include "magisk.h"
|
|
#endif
|
|
|
|
#include "magiskpolicy.h"
|
|
#include "sepolicy.h"
|
|
|
|
static int syntax_err = 0;
|
|
static char err_msg[ARG_MAX];
|
|
|
|
static void statements() {
|
|
fprintf(stderr,
|
|
"\nSupported policy statements:\n"
|
|
"\n"
|
|
"\"allow #source-class #target-class permission-class #permission\"\n"
|
|
"\"deny #source-class #target-class permission-class #permission\"\n"
|
|
"\"auditallow #source-class #target-class permission-class #permission\"\n"
|
|
"\"auditdeny #source-class #target-class permission-class #permission\"\n"
|
|
"\"create #class\"\n"
|
|
"\"permissive #class\"\n"
|
|
"\"enforcing #class\"\n"
|
|
"\"attradd #class #attribute\"\n"
|
|
"\"typetrans source-class target-class permission-class default-class (optional: object-name)\"\n"
|
|
"\nsource-class and target-class can be attributes (patches the whole group)\n"
|
|
"All sections (except typetrans) can be replaced with \'*\' to patch every possible matches\n"
|
|
"Sections marked with \'#\' can be replaced with collections in curly brackets\n"
|
|
"e.g: allow { source1 source2 } { target1 target2 } permission-class { permission1 permission2 }\n"
|
|
"Will be expanded to:\n"
|
|
"allow source1 target1 permission-class permission1\n"
|
|
"allow source1 target1 permission-class permission2\n"
|
|
"allow source1 target2 permission-class permission1\n"
|
|
"allow source1 target2 permission-class permission2\n"
|
|
"allow source2 target1 permission-class permission1\n"
|
|
"allow source2 target1 permission-class permission2\n"
|
|
"allow source2 target2 permission-class permission1\n"
|
|
"allow source2 target2 permission-class permission2\n"
|
|
"\n"
|
|
);
|
|
}
|
|
|
|
static void usage(char *arg0) {
|
|
fprintf(stderr,
|
|
"%s [--options...] [policystatements...]\n\n"
|
|
"Options:\n"
|
|
" --live: directly load patched policy to device\n"
|
|
// " --magisk: complete (very large!) patches for Magisk and MagiskSU\n"
|
|
" --minimal: minimal patches, used for boot image patches\n"
|
|
" --load <infile>: load policies from <infile>\n"
|
|
" (load from current policies if not specified)\n"
|
|
" --save <outfile>: save policies to <outfile>\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, *temp;
|
|
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;
|
|
switch (state) {
|
|
case 0:
|
|
temp = &source;
|
|
break;
|
|
case 1:
|
|
temp = ⌖
|
|
break;
|
|
case 2:
|
|
temp = NULL;
|
|
class = tok;
|
|
break;
|
|
case 3:
|
|
temp = &permission;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
vec_push_back(temp, 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)
|
|
switch (action) {
|
|
case 0:
|
|
if (sepol_allow(source.data[i], target.data[j], class, permission.data[k]))
|
|
fprintf(stderr, "Error in: allow %s %s %s %s\n", source.data[i], target.data[j], class, permission.data[k]);
|
|
break;
|
|
case 1:
|
|
if (sepol_deny(source.data[i], target.data[j], class, permission.data[k]))
|
|
fprintf(stderr, "Error in: deny %s %s %s %s\n", source.data[i], target.data[j], class, permission.data[k]);
|
|
break;
|
|
case 2:
|
|
if (sepol_auditallow(source.data[i], target.data[j], class, permission.data[k]))
|
|
fprintf(stderr, "Error in: auditallow %s %s %s %s\n", source.data[i], target.data[j], class, permission.data[k]);
|
|
break;
|
|
case 3:
|
|
if (sepol_auditdeny(source.data[i], target.data[j], class, permission.data[k]))
|
|
fprintf(stderr, "Error in: auditdeny %s %s %s %s\n", source.data[i], target.data[j], class, permission.data[k]);
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
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, *temp;
|
|
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;
|
|
switch (state) {
|
|
case 0:
|
|
temp = &class;
|
|
break;
|
|
case 1:
|
|
temp = &attribute;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
vec_push_back(temp, 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)
|
|
switch (action) {
|
|
case 0:
|
|
if (sepol_attradd(class.data[i], attribute.data[j]))
|
|
fprintf(stderr, "Error in: attradd %s %s\n", class.data[i], attribute.data[j]);
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
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) {
|
|
switch (action) {
|
|
case 0:
|
|
if (sepol_create(classes.data[i]))
|
|
fprintf(stderr, "Domain %s already exists\n", classes.data[i]);
|
|
break;
|
|
case 1:
|
|
if (sepol_permissive(classes.data[i]))
|
|
fprintf(stderr, "Error in: permissive %s\n", classes.data[i]);
|
|
break;
|
|
case 2:
|
|
if (sepol_enforce(classes.data[i]))
|
|
fprintf(stderr, "Error in: enforce %s\n", classes.data[i]);
|
|
break;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
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 *infile = NULL, *outfile = NULL, *tok, *saveptr;
|
|
int live = 0, minimal = 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], "--live") == 0)
|
|
live = 1;
|
|
else if (strcmp(argv[i], "--minimal") == 0)
|
|
minimal = 1;
|
|
else if (strcmp(argv[i], "--load") == 0) {
|
|
if (i + 1 >= argc) usage(argv[0]);
|
|
infile = argv[i + 1];
|
|
i += 1;
|
|
} else if (strcmp(argv[i], "--save") == 0) {
|
|
if (i + 1 >= argc) usage(argv[0]);
|
|
outfile = argv[i + 1];
|
|
i += 1;
|
|
} else
|
|
usage(argv[0]);
|
|
} else
|
|
vec_push_back(&rules, argv[i]);
|
|
}
|
|
|
|
// Use current policy if not specified
|
|
if(!infile)
|
|
infile = "/sys/fs/selinux/policy";
|
|
|
|
if (load_policydb(infile)) {
|
|
fprintf(stderr, "Could not load policy\n");
|
|
return 1;
|
|
}
|
|
|
|
if (minimal)
|
|
sepol_min_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 {
|
|
syntax_error_msg();
|
|
}
|
|
}
|
|
|
|
if (syntax_err)
|
|
statements();
|
|
|
|
vec_destroy(&rules);
|
|
|
|
if (live)
|
|
if (dump_policydb("/sys/fs/selinux/load"))
|
|
return 1;
|
|
|
|
if (outfile) {
|
|
unlink(outfile);
|
|
if (dump_policydb(outfile))
|
|
return 1;
|
|
}
|
|
|
|
destroy_policydb();
|
|
return 0;
|
|
}
|