bfb806120a
checkmodule -m and -b are fundamentally incompatible with each other, so reject attempts to use them together. Resolves https://bugzilla.redhat.com/show_bug.cgi?id=1064603 Also fix the error message for -m with -U to use stderr. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
307 lines
7.3 KiB
C
307 lines
7.3 KiB
C
/*
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* Authors: Joshua Brindle <jbrindle@tresys.com>
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* Karl MacMillan <kmacmillan@tresys.com>
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* Jason Tang <jtang@tresys.com>
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*
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*
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* Copyright (C) 2004-5 Tresys Technology, LLC
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*/
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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/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 <errno.h>
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#include <sys/mman.h>
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#include <sepol/policydb/policydb.h>
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#include <sepol/policydb/services.h>
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#include <sepol/policydb/conditional.h>
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#include <sepol/policydb/flask.h>
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#include <sepol/policydb/hierarchy.h>
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#include <sepol/policydb/expand.h>
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#include <sepol/policydb/link.h>
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#include <sepol/policydb/sidtab.h>
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#include "queue.h"
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#include "checkpolicy.h"
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#include "parse_util.h"
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extern char *optarg;
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extern int optind;
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static sidtab_t sidtab;
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extern int mlspol;
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static int handle_unknown = SEPOL_DENY_UNKNOWN;
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static char *txtfile = "policy.conf";
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static char *binfile = "policy";
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unsigned int policy_type = POLICY_BASE;
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unsigned int policyvers = MOD_POLICYDB_VERSION_MAX;
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static int read_binary_policy(policydb_t * p, char *file, char *progname)
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{
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int fd;
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struct stat sb;
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void *map;
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struct policy_file f, *fp;
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fd = open(file, 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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file, 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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file, strerror(errno));
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close(fd);
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return -1;
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}
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map =
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mmap(NULL, sb.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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close(fd);
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if (map == MAP_FAILED) {
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fprintf(stderr, "Can't map '%s': %s\n", file, strerror(errno));
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return -1;
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}
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policy_file_init(&f);
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f.type = PF_USE_MEMORY;
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f.data = map;
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f.len = sb.st_size;
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fp = &f;
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if (policydb_init(p)) {
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fprintf(stderr, "%s: policydb_init: Out of memory!\n",
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progname);
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return -1;
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}
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if (policydb_read(p, fp, 1)) {
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fprintf(stderr,
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"%s: error(s) encountered while parsing configuration\n",
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progname);
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return -1;
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}
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/* Check Policy Consistency */
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if (p->mls) {
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if (!mlspol) {
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fprintf(stderr, "%s: MLS policy, but non-MLS"
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" is specified\n", progname);
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return -1;
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}
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} else {
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if (mlspol) {
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fprintf(stderr, "%s: non-MLS policy, but MLS"
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" is specified\n", progname);
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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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static int write_binary_policy(policydb_t * p, char *file, char *progname)
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{
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FILE *outfp = NULL;
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struct policy_file pf;
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int ret;
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printf("%s: writing binary representation (version %d) to %s\n",
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progname, policyvers, file);
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outfp = fopen(file, "w");
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if (!outfp) {
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perror(file);
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exit(1);
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}
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p->policy_type = policy_type;
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p->policyvers = policyvers;
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p->handle_unknown = handle_unknown;
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policy_file_init(&pf);
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pf.type = PF_USE_STDIO;
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pf.fp = outfp;
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ret = policydb_write(p, &pf);
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if (ret) {
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fprintf(stderr, "%s: error writing %s\n", progname, file);
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return -1;
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}
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fclose(outfp);
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return 0;
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}
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static void usage(char *progname)
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{
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printf("usage: %s [-h] [-V] [-b] [-U handle_unknown] [-m] [-M] [-o FILE] [INPUT]\n", progname);
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printf("Build base and policy modules.\n");
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printf("Options:\n");
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printf(" INPUT build module from INPUT (else read from \"%s\")\n",
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txtfile);
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printf(" -V show policy versions created by this program\n");
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printf(" -b treat input as a binary policy file\n");
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printf(" -h print usage\n");
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printf(" -U OPTION How to handle unknown classes and permissions\n");
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printf(" deny: Deny unknown kernel checks\n");
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printf(" reject: Reject loading of policy with unknowns\n");
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printf(" allow: Allow unknown kernel checks\n");
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printf(" -m build a policy module instead of a base module\n");
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printf(" -M enable MLS policy\n");
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printf(" -o FILE write module to FILE (else just check syntax)\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char *file = txtfile, *outfile = NULL;
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unsigned int binary = 0;
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int ch;
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int show_version = 0;
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policydb_t modpolicydb;
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struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"output", required_argument, NULL, 'o'},
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{"binary", no_argument, NULL, 'b'},
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{"version", no_argument, NULL, 'V'},
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{"handle-unknown", required_argument, NULL, 'U'},
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{"mls", no_argument, NULL, 'M'},
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{NULL, 0, NULL, 0}
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};
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while ((ch = getopt_long(argc, argv, "ho:bVU:mM", long_options, NULL)) != -1) {
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switch (ch) {
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case 'h':
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usage(argv[0]);
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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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case 'b':
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binary = 1;
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file = binfile;
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break;
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case 'V':
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show_version = 1;
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break;
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case 'U':
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if (!strcasecmp(optarg, "deny")) {
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handle_unknown = DENY_UNKNOWN;
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break;
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}
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if (!strcasecmp(optarg, "reject")) {
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handle_unknown = REJECT_UNKNOWN;
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break;
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}
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if (!strcasecmp(optarg, "allow")) {
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handle_unknown = ALLOW_UNKNOWN;
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break;
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}
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usage(argv[0]);
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case 'm':
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policy_type = POLICY_MOD;
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policyvers = MOD_POLICYDB_VERSION_MAX;
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break;
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case 'M':
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mlspol = 1;
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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 (show_version) {
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printf("Module versions %d-%d\n",
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MOD_POLICYDB_VERSION_MIN, MOD_POLICYDB_VERSION_MAX);
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exit(0);
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}
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if (handle_unknown && (policy_type != POLICY_BASE)) {
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fprintf(stderr, "%s: Handling of unknown classes and permissions is only valid in the base module.\n", argv[0]);
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exit(1);
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}
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if (binary && (policy_type != POLICY_BASE)) {
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fprintf(stderr, "%s: -b and -m are incompatible with each other.\n", argv[0]);
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exit(1);
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}
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if (optind != argc) {
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file = argv[optind++];
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if (optind != argc)
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usage(argv[0]);
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}
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printf("%s: loading policy configuration from %s\n", argv[0], file);
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/* Set policydb and sidtab used by libsepol service functions
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to my structures, so that I can directly populate and
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manipulate them. */
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sepol_set_policydb(&modpolicydb);
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sepol_set_sidtab(&sidtab);
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if (binary) {
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if (read_binary_policy(&modpolicydb, file, argv[0]) == -1) {
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exit(1);
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}
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} else {
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if (policydb_init(&modpolicydb)) {
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fprintf(stderr, "%s: out of memory!\n", argv[0]);
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return -1;
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}
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modpolicydb.policy_type = policy_type;
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modpolicydb.mls = mlspol;
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modpolicydb.handle_unknown = handle_unknown;
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if (read_source_policy(&modpolicydb, file, argv[0]) == -1) {
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exit(1);
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}
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if (hierarchy_check_constraints(NULL, &modpolicydb)) {
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return -1;
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}
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}
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if (modpolicydb.policy_type == POLICY_BASE) {
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/* Verify that we can successfully expand the base module. */
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policydb_t kernpolicydb;
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if (policydb_init(&kernpolicydb)) {
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fprintf(stderr, "%s: policydb_init failed\n", argv[0]);
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exit(1);
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}
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if (link_modules(NULL, &modpolicydb, NULL, 0, 0)) {
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fprintf(stderr, "%s: link modules failed\n", argv[0]);
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exit(1);
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}
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if (expand_module(NULL, &modpolicydb, &kernpolicydb, 0, 1)) {
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fprintf(stderr, "%s: expand module failed\n", argv[0]);
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exit(1);
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}
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policydb_destroy(&kernpolicydb);
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}
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if (policydb_load_isids(&modpolicydb, &sidtab))
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exit(1);
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sepol_sidtab_destroy(&sidtab);
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printf("%s: policy configuration loaded\n", argv[0]);
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if (outfile &&
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write_binary_policy(&modpolicydb, outfile, argv[0]) == -1) {
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exit(1);
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}
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policydb_destroy(&modpolicydb);
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return 0;
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}
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/* FLASK */
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