TheArchive/Magisk
1
0
Fork 0
mirror of https://github.com/topjohnwu/Magisk.git synced 2024-11-24 18:45:28 +00:00
Code Issues Packages Projects Releases Wiki Activity
9de3c582c0
Magisk/magiskpolicy.c
topjohnwu 670397a73e Add extended permission support
2017-04-20 04:04:09 +08:00

455 lines
13 KiB
C
Raw Blame History

/* 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"
"\"typetrans source-class target-class permission-class default-class (optional: object-name)\"\n"
"\"allowxperm #source-class #target-class #permission-class ioctl range\"\n"
"\"auditallowxperm #source-class #target-class #permission-class ioctl range\"\n"
"\"dontauditxperm #source-class #target-class #permission-class ioctl range\"\n"
"\"create #class\"\n"
"\"permissive #class\"\n"
"\"enforcing #class\"\n"
"\"attradd #class #attribute\"\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 = &target;
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;
}
// 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, *temp;
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;
switch (state) {
case 0:
temp = &source;
break;
case 1:
temp = &target;
break;
case 2:
temp = &class;
break;
case 3:
// Should always be ioctl
temp = NULL;
break;
case 4:
temp = NULL;
range = tok;
break;
default:
return 1;
}
vec_push_back(temp, 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)
switch (action) {
case 0:
if (sepol_allowxperm(source.data[i], target.data[j], class.data[k], range))
fprintf(stderr, "Error in: allowxperm %s %s %s %s\n", source.data[i], target.data[j], class.data[k], range);
break;
case 1:
if (sepol_auditallowxperm(source.data[i], target.data[j], class.data[k], range))
fprintf(stderr, "Error in: auditallowxperm %s %s %s %s\n", source.data[i], target.data[j], class.data[k], range);
break;
case 2:
if (sepol_dontauditxperm(source.data[i], target.data[j], class.data[k], range))
fprintf(stderr, "Error in: dontauditxperm %s %s %s %s\n", source.data[i], target.data[j], class.data[k], range);
break;
default:
return 1;
}
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 *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 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 (live)
if (dump_policydb("/sys/fs/selinux/load"))
return 1;
if (outfile) {
unlink(outfile);
if (dump_policydb(outfile))
return 1;
}
destroy_policydb();
return 0;
}
Reference in New Issue View Git Blame Copy Permalink