forked from MarcoBuster/Magisk
initial commit
This commit is contained in:
Joshua Brindle
commit
0099ff1321
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@ -0,0 +1,10 @@
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PREFIX ?= $(DESTDIR)/usr
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BINDIR ?= $(PREFIX)/bin
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LIBDIR ?= $(PREFIX)/lib/x86_64-linux-gnu
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CFLAGS ?= -g -Wall -Werror -Wshadow -O2 -pipe -fno-strict-aliasing
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LDLIBS=$(LIBDIR)/libsepol.a
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all: sepolicy-inject
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sepolicy-inject: sepolicy-inject.c
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Injects allow rules into binary SELinux kernel policies
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joshua@QuarkZilla:~/sepolicy-inject$ ./sepolicy-inject -s shell -t system -c file -p read -P sepolicy -o sepolicy2
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libsepol.policydb_index_others: security: 1 users, 2 roles, 518 types, 14 bools
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libsepol.policydb_index_others: security: 1 sens, 1024 cats
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libsepol.policydb_index_others: security: 84 classes, 4539 rules, 162 cond rules
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joshua@QuarkZilla:~/sepolicy-inject$ sesearch -A -s shell -t system -c file sepolicy
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Found 1 semantic av rules:
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allow appdomain domain : file { ioctl read getattr lock open } ;
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joshua@QuarkZilla:~/sepolicy-inject$ sesearch -A -s shell -t system -c file sepolicy2
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Found 2 semantic av rules:
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allow shell system : file read ;
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allow appdomain domain : file { ioctl read getattr lock open } ;
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#include <getopt.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sepol/policydb/policydb.h>
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#include <sepol/policydb/services.h>
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void usage(char *arg0) {
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fprintf(stderr, "%s -s <source type> -t <target type> -c <class> -p <perm> -P <policy file> -o <output file>\n", arg0);
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exit(1);
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}
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void *cmalloc(size_t s) {
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void *t = malloc(s);
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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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int add_rule(char *s, char *t, char *c, char *p, policydb_t *policy) {
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type_datum_t *src, *tgt;
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class_datum_t *cls;
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perm_datum_t *perm;
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avtab_datum_t *av;
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avtab_key_t key;
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src = hashtab_search(policy->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(policy->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(policy->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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perm = hashtab_search(cls->permissions.table, p);
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if (perm == NULL) {
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if (cls->comdatum == NULL) {
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fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
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return 1;
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}
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perm = hashtab_search(cls->comdatum->permissions.table, p);
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if (perm == NULL) {
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fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
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return 1;
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}
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}
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// See if there is already a rule
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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_ALLOWED;
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av = avtab_search(&policy->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof av);
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av->data |= 1U << (perm->s.value - 1);
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int ret = avtab_insert(&policy->te_avtab, &key, av);
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if (ret) {
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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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}
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av->data |= 1U << (perm->s.value - 1);
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return 0;
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}
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int load_policy(char *filename, policydb_t *policydb, struct policy_file *pf) {
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int fd;
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struct stat sb;
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void *map;
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int ret;
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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, 1);
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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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return 0;
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}
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int main(int argc, char **argv)
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{
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char *policy = NULL, *source = NULL, *target = NULL, *class = NULL, *perm = NULL, *outfile = NULL;
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policydb_t policydb;
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struct policy_file pf, outpf;
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sidtab_t sidtab;
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char ch;
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FILE *fp;
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struct option long_options[] = {
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{"source", required_argument, NULL, 's'},
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{"target", required_argument, NULL, 't'},
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{"class", required_argument, NULL, 'c'},
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{"perm", required_argument, NULL, 'p'},
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{"policy", required_argument, NULL, 'P'},
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{"output", required_argument, NULL, 'o'},
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{NULL, 0, NULL, 0}
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};
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while ((ch = getopt_long(argc, argv, "s:t:c:p:P:o:", long_options, NULL)) != -1) {
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switch (ch) {
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case 's':
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source = optarg;
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break;
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case 't':
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target = optarg;
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break;
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case 'c':
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class = optarg;
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break;
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case 'p':
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perm = optarg;
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break;
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case 'P':
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policy = optarg;
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break;
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case 'o':
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outfile = optarg;
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break;
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default:
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usage(argv[0]);
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}
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}
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if (!source || !target || !class || !perm || !policy)
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usage(argv[0]);
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sepol_set_policydb(&policydb);
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sepol_set_sidtab(&sidtab);
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if (load_policy(policy, &policydb, &pf)) {
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fprintf(stderr, "Could not load policy\n");
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return 1;
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}
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if (policydb_load_isids(&policydb, &sidtab))
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return 1;
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if (add_rule(source, target, class, perm, &policydb)) {
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fprintf(stderr, "Could not add rule\n");
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return 1;
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}
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fp = fopen(outfile, "w");
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if (!fp) {
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fprintf(stderr, "Could not open outfile\n");
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return 1;
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}
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policy_file_init(&outpf);
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outpf.type = PF_USE_STDIO;
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outpf.fp = fp;
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if (policydb_write(&policydb, &outpf)) {
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fprintf(stderr, "Could not write policy\n");
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return 1;
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}
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policydb_destroy(&policydb);
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fclose(fp);
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return 0;
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}
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