mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 18:45:28 +00:00
573 lines
14 KiB
C
573 lines
14 KiB
C
#include "magiskpolicy.h"
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#include "sepolicy.h"
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policydb_t *policydb = NULL;
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static void *cmalloc(size_t s) {
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void *t = calloc(s, 1);
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if (t == NULL) {
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fprintf(stderr, "Out of memory\n");
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exit(1);
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}
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return t;
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}
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static int get_attr(char *type, int value) {
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type_datum_t *attr = hashtab_search(policydb->p_types.table, type);
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if (!attr)
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return 1;
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if (attr->flavor != TYPE_ATTRIB)
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return 1;
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return !! ebitmap_get_bit(&policydb->attr_type_map[attr->s.value-1], value-1);
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}
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static int get_attr_id(char *type) {
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type_datum_t *attr = hashtab_search(policydb->p_types.table, type);
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if (!attr)
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return 1;
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if (attr->flavor != TYPE_ATTRIB)
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return 1;
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return attr->s.value;
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}
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static int set_attr(char *type, int value) {
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type_datum_t *attr = hashtab_search(policydb->p_types.table, type);
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if (!attr)
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return 1;
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if (attr->flavor != TYPE_ATTRIB)
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return 1;
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if(ebitmap_set_bit(&policydb->type_attr_map[value-1], attr->s.value-1, 1))
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return 1;
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if(ebitmap_set_bit(&policydb->attr_type_map[attr->s.value-1], value-1, 1))
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return 1;
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return 0;
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}
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static int __add_rule(int s, int t, int c, int p, int effect, int not) {
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avtab_key_t key;
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avtab_datum_t *av;
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int new_rule = 0;
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key.source_type = s;
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key.target_type = t;
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key.target_class = c;
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key.specified = effect;
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av = avtab_search(&policydb->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof(*av));
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new_rule = 1;
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}
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if(not) {
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if (p < 0)
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av->data = 0U;
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else
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av->data &= ~(1U << (p - 1));
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} else {
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if (p < 0)
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av->data = ~0U;
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else
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av->data |= 1U << (p - 1);
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}
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if (new_rule) {
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if (avtab_insert(&policydb->te_avtab, &key, av)) {
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fprintf(stderr, "Error inserting into avtab\n");
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return 1;
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}
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free(av);
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}
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return 0;
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}
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static int add_rule_auto(type_datum_t *src, type_datum_t *tgt, class_datum_t *cls, perm_datum_t *perm, int effect, int not) {
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hashtab_ptr_t cur;
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int ret = 0;
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if (src == NULL) {
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hashtab_for_each(policydb->p_types.table, &cur) {
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src = cur->datum;
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ret |= add_rule_auto(src, tgt, cls, perm, effect, not);
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}
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} else if (tgt == NULL) {
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hashtab_for_each(policydb->p_types.table, &cur) {
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tgt = cur->datum;
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ret |= add_rule_auto(src, tgt, cls, perm, effect, not);
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}
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} else if (cls == NULL) {
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hashtab_for_each(policydb->p_classes.table, &cur) {
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cls = cur->datum;
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ret |= __add_rule(src->s.value, tgt->s.value, cls->s.value, -1, effect, not);
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}
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} else {
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return __add_rule(src->s.value, tgt->s.value, cls->s.value, perm ? perm->s.value : -1, effect, not);
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}
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return ret;
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}
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#define ioctl_driver(x) (x>>8 & 0xFF)
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#define ioctl_func(x) (x & 0xFF)
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static int __add_xperm_rule(int s, int t, int c, uint16_t low, uint16_t high, int effect, int not) {
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avtab_key_t key;
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avtab_datum_t *av;
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int new_rule = 0;
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key.source_type = s;
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key.target_type = t;
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key.target_class = c;
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key.specified = effect;
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av = avtab_search(&policydb->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof(*av));
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av->xperms = cmalloc(sizeof(avtab_extended_perms_t));
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new_rule = 1;
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if (ioctl_driver(low) != ioctl_driver(high)) {
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av->xperms->specified = AVTAB_XPERMS_IOCTLDRIVER;
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av->xperms->driver = 0;
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} else {
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av->xperms->specified = AVTAB_XPERMS_IOCTLFUNCTION;
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av->xperms->driver = ioctl_driver(low);
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}
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}
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if (av->xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
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for (unsigned i = ioctl_driver(low); i <= ioctl_driver(high); ++i) {
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if (not)
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xperm_clear(i, av->xperms->perms);
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else
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xperm_set(i, av->xperms->perms);
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}
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} else {
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for (unsigned i = ioctl_func(low); i <= ioctl_func(high); ++i) {
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if (not)
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xperm_clear(i, av->xperms->perms);
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else
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xperm_set(i, av->xperms->perms);
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}
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}
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if (new_rule) {
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if (avtab_insert(&policydb->te_avtab, &key, av)) {
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fprintf(stderr, "Error inserting into avtab\n");
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return 1;
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}
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free(av);
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}
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return 0;
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}
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static int add_xperm_rule_auto(type_datum_t *src, type_datum_t *tgt, class_datum_t *cls,
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uint16_t low, uint16_t high, int effect, int not) {
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hashtab_ptr_t cur;
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int ret = 0;
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if (src == NULL) {
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hashtab_for_each(policydb->p_types.table, &cur) {
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src = cur->datum;
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ret |= add_xperm_rule_auto(src, tgt, cls, low, high, effect, not);
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}
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} else if (tgt == NULL) {
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hashtab_for_each(policydb->p_types.table, &cur) {
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tgt = cur->datum;
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ret |= add_xperm_rule_auto(src, tgt, cls, low, high, effect, not);
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}
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} else if (cls == NULL) {
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hashtab_for_each(policydb->p_classes.table, &cur) {
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cls = cur->datum;
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ret |= __add_xperm_rule(src->s.value, tgt->s.value, cls->s.value, low, high, effect, not);
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}
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} else {
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return __add_xperm_rule(src->s.value, tgt->s.value, cls->s.value, low, high, effect, not);
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}
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return ret;
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}
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int load_policydb(const char *filename) {
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int fd;
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struct stat sb;
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struct policy_file pf;
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void *map;
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int ret;
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if (policydb)
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destroy_policydb();
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policydb = cmalloc(sizeof(*policydb));
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Can't open '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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if (fstat(fd, &sb) < 0) {
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fprintf(stderr, "Can't stat '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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map = mmap(NULL, sb.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
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fd, 0);
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if (map == MAP_FAILED) {
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fprintf(stderr, "Can't mmap '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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policy_file_init(&pf);
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pf.type = PF_USE_MEMORY;
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pf.data = map;
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pf.len = sb.st_size;
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if (policydb_init(policydb)) {
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fprintf(stderr, "policydb_init: Out of memory!\n");
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return 1;
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}
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ret = policydb_read(policydb, &pf, 0);
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if (ret) {
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fprintf(stderr, "error(s) encountered while parsing configuration\n");
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return 1;
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}
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munmap(map, sb.st_size);
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close(fd);
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return 0;
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}
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int dump_policydb(const char *filename) {
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int fd, ret;
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void *data = NULL;
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size_t len;
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policydb_to_image(NULL, policydb, &data, &len);
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if (data == NULL) {
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fprintf(stderr, "Fail to dump policy image!");
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return 1;
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}
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fd = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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if (fd < 0) {
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fprintf(stderr, "Can't open '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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ret = write(fd, data, len);
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close(fd);
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if (ret < 0) {
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fprintf(stderr, "Could not write policy to %s\n",
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filename);
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return 1;
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}
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return 0;
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}
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void destroy_policydb() {
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policydb_destroy(policydb);
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free(policydb);
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policydb = NULL;
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}
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int create_domain(char *d) {
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symtab_datum_t *src = hashtab_search(policydb->p_types.table, d);
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if(src) {
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fprintf(stderr, "Domain %s already exists\n", d);
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return 1;
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}
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type_datum_t *typedatum = (type_datum_t *) malloc(sizeof(type_datum_t));
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type_datum_init(typedatum);
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typedatum->primary = 1;
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typedatum->flavor = TYPE_TYPE;
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uint32_t value = 0;
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int r = symtab_insert(policydb, SYM_TYPES, strdup(d), typedatum, SCOPE_DECL, 1, &value);
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typedatum->s.value = value;
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if (ebitmap_set_bit(&policydb->global->branch_list->declared.scope[SYM_TYPES], value - 1, 1)) {
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return 1;
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}
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policydb->type_attr_map = realloc(policydb->type_attr_map, sizeof(ebitmap_t) * policydb->p_types.nprim);
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policydb->attr_type_map = realloc(policydb->attr_type_map, sizeof(ebitmap_t) * policydb->p_types.nprim);
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ebitmap_init(&policydb->type_attr_map[value-1]);
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ebitmap_init(&policydb->attr_type_map[value-1]);
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ebitmap_set_bit(&policydb->type_attr_map[value-1], value-1, 1);
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//Add the domain to all roles
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for(unsigned i=0; i<policydb->p_roles.nprim; ++i) {
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//Not sure all those three calls are needed
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ebitmap_set_bit(&policydb->role_val_to_struct[i]->types.negset, value-1, 0);
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ebitmap_set_bit(&policydb->role_val_to_struct[i]->types.types, value-1, 1);
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type_set_expand(&policydb->role_val_to_struct[i]->types, &policydb->role_val_to_struct[i]->cache, policydb, 0);
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}
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src = hashtab_search(policydb->p_types.table, d);
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if(!src)
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return 1;
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if(policydb_index_decls(NULL, policydb))
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return 1;
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if(policydb_index_classes(policydb))
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return 1;
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if(policydb_index_others(NULL, policydb, 0))
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return 1;
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return set_attr("domain", value);
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}
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int set_domain_state(char* s, int state) {
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type_datum_t *type;
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hashtab_ptr_t cur;
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if (s == NULL) {
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hashtab_for_each(policydb->p_types.table, &cur) {
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type = cur->datum;
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if (ebitmap_set_bit(&policydb->permissive_map, type->s.value, state)) {
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fprintf(stderr, "Could not set bit in permissive map\n");
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return 1;
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}
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}
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} else {
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type = hashtab_search(policydb->p_types.table, s);
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if (type == NULL) {
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fprintf(stderr, "type %s does not exist\n", s);
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return 1;
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}
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if (ebitmap_set_bit(&policydb->permissive_map, type->s.value, state)) {
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fprintf(stderr, "Could not set bit in permissive map\n");
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return 1;
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}
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}
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return 0;
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}
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int add_transition(char *s, char *t, char *c, char *d) {
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type_datum_t *src, *tgt, *def;
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class_datum_t *cls;
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avtab_key_t key;
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avtab_datum_t *av;
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int new_rule = 0;
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src = hashtab_search(policydb->p_types.table, s);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", s);
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return 1;
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}
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tgt = hashtab_search(policydb->p_types.table, t);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", t);
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return 1;
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}
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cls = hashtab_search(policydb->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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def = hashtab_search(policydb->p_types.table, d);
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if (def == NULL) {
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fprintf(stderr, "default type %s does not exist\n", d);
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return 1;
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}
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key.source_type = src->s.value;
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key.target_type = tgt->s.value;
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key.target_class = cls->s.value;
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key.specified = AVTAB_TRANSITION;
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av = avtab_search(&policydb->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof(*av));
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new_rule = 1;
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}
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av->data = def->s.value;
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if (new_rule) {
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if (avtab_insert(&policydb->te_avtab, &key, av)) {
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fprintf(stderr, "Error inserting into avtab\n");
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return 1;
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}
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free(av);
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}
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return 0;
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}
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int add_file_transition(char *s, char *t, char *c, char *d, char* filename) {
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type_datum_t *src, *tgt, *def;
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class_datum_t *cls;
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src = hashtab_search(policydb->p_types.table, s);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", s);
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return 1;
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}
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tgt = hashtab_search(policydb->p_types.table, t);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", t);
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return 1;
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}
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cls = hashtab_search(policydb->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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def = hashtab_search(policydb->p_types.table, d);
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if (def == NULL) {
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fprintf(stderr, "default type %s does not exist\n", d);
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return 1;
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}
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filename_trans_t trans_key;
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trans_key.stype = src->s.value;
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trans_key.ttype = tgt->s.value;
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trans_key.tclass = cls->s.value;
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trans_key.name = filename;
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filename_trans_datum_t *trans_datum;
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trans_datum = hashtab_search(policydb->p_types.table, (hashtab_key_t) &trans_key);
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if (trans_datum == NULL) {
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trans_datum = cmalloc(sizeof(*trans_datum));
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hashtab_insert(policydb->filename_trans, (hashtab_key_t) &trans_key, trans_datum);
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}
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// Overwrite existing
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trans_datum->otype = def->s.value;
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return 0;
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}
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int add_typeattribute(char *domainS, char *attr) {
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type_datum_t *domain;
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domain = hashtab_search(policydb->p_types.table, domainS);
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if (domain == NULL) {
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fprintf(stderr, "source type %s does not exist\n", domainS);
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return 1;
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}
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set_attr(attr, domain->s.value);
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int typeId = get_attr_id(attr);
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//Now let's update all constraints!
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//(kernel doesn't support (yet?) type_names rules)
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for(int i=0; i<policydb->p_classes.nprim; ++i) {
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class_datum_t *cl = policydb->class_val_to_struct[i];
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for(constraint_node_t *n = cl->constraints; n ; n=n->next) {
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for(constraint_expr_t *e = n->expr; e; e=e->next) {
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if(e->expr_type == CEXPR_NAMES) {
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if(ebitmap_get_bit(&e->type_names->types, typeId-1)) {
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ebitmap_set_bit(&e->names, domain->s.value-1, 1);
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}
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}
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}
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}
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}
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return 0;
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}
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int add_rule(char *s, char *t, char *c, char *p, int effect, int not) {
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type_datum_t *src = NULL, *tgt = NULL;
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class_datum_t *cls = NULL;
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perm_datum_t *perm = NULL;
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if (s) {
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src = hashtab_search(policydb->p_types.table, s);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", s);
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return 1;
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}
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}
|
|
|
|
if (t) {
|
|
tgt = hashtab_search(policydb->p_types.table, t);
|
|
if (tgt == NULL) {
|
|
fprintf(stderr, "target type %s does not exist\n", t);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (c) {
|
|
cls = hashtab_search(policydb->p_classes.table, c);
|
|
if (cls == NULL) {
|
|
fprintf(stderr, "class %s does not exist\n", c);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (p) {
|
|
if (c == NULL) {
|
|
fprintf(stderr, "No class is specified, cannot add perm [%s] \n", p);
|
|
return 1;
|
|
}
|
|
|
|
if (cls != NULL) {
|
|
perm = hashtab_search(cls->permissions.table, p);
|
|
if (perm == NULL && cls->comdatum != NULL) {
|
|
perm = hashtab_search(cls->comdatum->permissions.table, p);
|
|
}
|
|
if (perm == NULL) {
|
|
fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
return add_rule_auto(src, tgt, cls, perm, effect, not);
|
|
}
|
|
|
|
int add_xperm_rule(char *s, char *t, char *c, char *range, int effect, int not) {
|
|
type_datum_t *src = NULL, *tgt = NULL;
|
|
class_datum_t *cls = NULL;
|
|
|
|
if (s) {
|
|
src = hashtab_search(policydb->p_types.table, s);
|
|
if (src == NULL) {
|
|
fprintf(stderr, "source type %s does not exist\n", s);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (t) {
|
|
tgt = hashtab_search(policydb->p_types.table, t);
|
|
if (tgt == NULL) {
|
|
fprintf(stderr, "target type %s does not exist\n", t);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (c) {
|
|
cls = hashtab_search(policydb->p_classes.table, c);
|
|
if (cls == NULL) {
|
|
fprintf(stderr, "class %s does not exist\n", c);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
uint16_t low, high;
|
|
|
|
if (range) {
|
|
if (strchr(range, '-')){
|
|
sscanf(range, "%hx-%hx", &low, &high);
|
|
} else {
|
|
sscanf(range, "%hx", &low);
|
|
high = low;
|
|
}
|
|
} else {
|
|
low = 0;
|
|
high = 0xFFFF;
|
|
}
|
|
|
|
return add_xperm_rule_auto(src, tgt, cls, low, high, effect, not);
|
|
}
|