mirror of
https://github.com/SELinuxProject/selinux
synced 2024-12-12 09:05:00 +00:00
242a98cd21
We have some useless globals in setfiles that don't need to be. Stop it. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Dan Walsh <dwalsh@redhat.com>
440 lines
9.4 KiB
C
440 lines
9.4 KiB
C
#include "restore.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio_ext.h>
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#include <ctype.h>
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#include <regex.h>
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#include <sys/vfs.h>
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#define __USE_XOPEN_EXTENDED 1 /* nftw */
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#include <libgen.h>
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#ifdef USE_AUDIT
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#include <libaudit.h>
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#ifndef AUDIT_FS_RELABEL
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#define AUDIT_FS_RELABEL 2309
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#endif
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#endif
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/* cmdline opts*/
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static char *policyfile = NULL;
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static int warn_no_match = 0;
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static int null_terminated = 0;
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static struct restore_opts r_opts;
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#define STAT_BLOCK_SIZE 1
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#define SETFILES "setfiles"
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#define RESTORECON "restorecon"
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static int iamrestorecon;
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/* Behavior flags determined based on setfiles vs. restorecon */
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static int ctx_validate; /* Validate contexts */
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static const char *altpath; /* Alternate path to file_contexts */
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void usage(const char *const name)
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{
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if (iamrestorecon) {
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fprintf(stderr,
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"usage: %s [-iFnprRv0] [-e excludedir ] [-o filename ] [-f filename | pathname... ]\n",
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name);
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} else {
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fprintf(stderr,
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"usage: %s [-dnpqvW] [-o filename] [-r alt_root_path ] spec_file pathname...\n"
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"usage: %s -c policyfile spec_file\n"
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"usage: %s -s [-dnpqvW] [-o filename ] spec_file\n", name, name,
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name);
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}
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exit(1);
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}
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static int nerr = 0;
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void inc_err()
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{
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nerr++;
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if (nerr > 9 && !r_opts.debug) {
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fprintf(stderr, "Exiting after 10 errors.\n");
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exit(1);
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}
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}
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void set_rootpath(const char *arg)
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{
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int len;
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r_opts.rootpath = strdup(arg);
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if (NULL == r_opts.rootpath) {
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fprintf(stderr, "%s: insufficient memory for r_opts.rootpath\n",
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r_opts.progname);
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exit(1);
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}
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/* trim trailing /, if present */
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len = strlen(r_opts.rootpath);
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while (len && ('/' == r_opts.rootpath[len - 1]))
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r_opts.rootpath[--len] = 0;
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r_opts.rootpathlen = len;
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}
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int canoncon(char **contextp)
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{
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char *context = *contextp, *tmpcon;
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int rc = 0;
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if (policyfile) {
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if (sepol_check_context(context) < 0) {
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fprintf(stderr, "invalid context %s\n", context);
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exit(1);
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}
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} else if (security_canonicalize_context_raw(context, &tmpcon) == 0) {
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free(context);
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*contextp = tmpcon;
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} else if (errno != ENOENT) {
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rc = -1;
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inc_err();
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}
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return rc;
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}
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#ifndef USE_AUDIT
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static void maybe_audit_mass_relabel(int mass_relabel __attribute__((unused)),
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int mass_relabel_errs __attribute__((unused)))
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{
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#else
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static void maybe_audit_mass_relabel(int mass_relabel, int mass_relabel_errs)
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{
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int audit_fd = -1;
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int rc = 0;
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if (!mass_relabel) /* only audit a forced full relabel */
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return;
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audit_fd = audit_open();
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if (audit_fd < 0) {
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fprintf(stderr, "Error connecting to audit system.\n");
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exit(-1);
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}
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rc = audit_log_user_message(audit_fd, AUDIT_FS_RELABEL,
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"op=mass relabel", NULL, NULL, NULL, !mass_relabel_errs);
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if (rc <= 0) {
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fprintf(stderr, "Error sending audit message: %s.\n",
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strerror(errno));
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/* exit(-1); -- don't exit atm. as fix for eff_cap isn't in most kernels */
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}
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audit_close(audit_fd);
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#endif
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}
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int main(int argc, char **argv)
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{
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struct stat sb;
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int opt, i = 0;
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char *input_filename = NULL;
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int use_input_file = 0;
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char *buf = NULL;
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size_t buf_len;
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int recurse; /* Recursive descent. */
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char *base;
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int mass_relabel = 0, errors = 0;
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memset(&r_opts, 0, sizeof(r_opts));
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/* Initialize variables */
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r_opts.progress = 0;
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r_opts.count = 0;
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r_opts.debug = 0;
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r_opts.change = 1;
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r_opts.verbose = 0;
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r_opts.logging = 0;
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r_opts.rootpath = NULL;
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r_opts.rootpathlen = 0;
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r_opts.outfile = NULL;
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r_opts.force = 0;
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r_opts.hard_links = 1;
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altpath = NULL;
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r_opts.progname = strdup(argv[0]);
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if (!r_opts.progname) {
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fprintf(stderr, "%s: Out of memory!\n", argv[0]);
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exit(1);
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}
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base = basename(r_opts.progname);
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if (!strcmp(base, SETFILES)) {
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/*
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* setfiles:
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* Recursive descent,
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* Does not expand paths via realpath,
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* Aborts on errors during the file tree walk,
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* Try to track inode associations for conflict detection,
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* Does not follow mounts,
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* Validates all file contexts at init time.
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*/
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iamrestorecon = 0;
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recurse = 1;
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r_opts.expand_realpath = 0;
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r_opts.abort_on_error = 1;
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r_opts.add_assoc = 1;
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r_opts.fts_flags = FTS_PHYSICAL | FTS_XDEV;
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ctx_validate = 1;
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} else {
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/*
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* restorecon:
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* No recursive descent unless -r/-R,
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* Expands paths via realpath,
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* Do not abort on errors during the file tree walk,
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* Do not try to track inode associations for conflict detection,
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* Follows mounts,
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* Does lazy validation of contexts upon use.
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*/
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if (strcmp(base, RESTORECON) && !r_opts.quiet)
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printf("Executed with an unrecognized name (%s), defaulting to %s behavior.\n", base, RESTORECON);
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iamrestorecon = 1;
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recurse = 0;
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r_opts.expand_realpath = 1;
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r_opts.abort_on_error = 0;
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r_opts.add_assoc = 0;
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r_opts.fts_flags = FTS_PHYSICAL;
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ctx_validate = 0;
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/* restorecon only: silent exit if no SELinux.
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Allows unconditional execution by scripts. */
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if (is_selinux_enabled() <= 0)
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exit(0);
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}
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/* This must happen before getopt. */
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exclude_non_seclabel_mounts();
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/* Process any options. */
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while ((opt = getopt(argc, argv, "c:de:f:ilnpqrsvo:FRW0")) > 0) {
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switch (opt) {
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case 'c':
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{
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FILE *policystream;
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if (iamrestorecon)
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usage(argv[0]);
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policyfile = optarg;
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policystream = fopen(policyfile, "r");
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if (!policystream) {
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fprintf(stderr,
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"Error opening %s: %s\n",
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policyfile, strerror(errno));
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exit(1);
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}
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__fsetlocking(policystream,
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FSETLOCKING_BYCALLER);
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if (sepol_set_policydb_from_file(policystream) <
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0) {
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fprintf(stderr,
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"Error reading policy %s: %s\n",
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policyfile, strerror(errno));
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exit(1);
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}
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fclose(policystream);
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ctx_validate = 1;
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break;
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}
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case 'e':
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remove_exclude(optarg);
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if (lstat(optarg, &sb) < 0 && errno != EACCES) {
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fprintf(stderr, "Can't stat exclude path \"%s\", %s - ignoring.\n",
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optarg, strerror(errno));
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break;
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}
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if (add_exclude(optarg))
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exit(1);
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break;
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case 'f':
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use_input_file = 1;
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input_filename = optarg;
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break;
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case 'd':
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r_opts.debug = 1;
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break;
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case 'i':
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r_opts.ignore_enoent = 1;
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break;
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case 'l':
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r_opts.logging = 1;
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break;
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case 'F':
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r_opts.force = 1;
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break;
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case 'n':
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r_opts.change = 0;
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break;
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case 'o':
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if (strcmp(optarg, "-") == 0) {
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r_opts.outfile = stdout;
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break;
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}
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r_opts.outfile = fopen(optarg, "w");
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if (!r_opts.outfile) {
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fprintf(stderr, "Error opening %s: %s\n",
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optarg, strerror(errno));
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usage(argv[0]);
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}
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__fsetlocking(r_opts.outfile, FSETLOCKING_BYCALLER);
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break;
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case 'q':
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r_opts.quiet = 1;
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break;
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case 'R':
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case 'r':
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if (iamrestorecon) {
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recurse = 1;
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break;
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}
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if (optind + 1 >= argc) {
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fprintf(stderr, "usage: %s -r rootpath\n",
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argv[0]);
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exit(1);
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}
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if (NULL != r_opts.rootpath) {
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fprintf(stderr,
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"%s: only one -r can be specified\n",
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argv[0]);
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exit(1);
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}
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set_rootpath(argv[optind++]);
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break;
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case 's':
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use_input_file = 1;
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input_filename = "-";
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r_opts.add_assoc = 0;
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break;
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case 'v':
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if (r_opts.progress) {
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fprintf(stderr,
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"Progress and Verbose mutually exclusive\n");
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exit(1);
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}
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r_opts.verbose++;
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break;
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case 'p':
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if (r_opts.verbose) {
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fprintf(stderr,
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"Progress and Verbose mutually exclusive\n");
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usage(argv[0]);
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}
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r_opts.progress = 1;
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break;
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case 'W':
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warn_no_match = 1;
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break;
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case '0':
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null_terminated = 1;
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break;
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case '?':
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usage(argv[0]);
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}
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}
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if (!iamrestorecon) {
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if (policyfile) {
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if (optind != (argc - 1))
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usage(argv[0]);
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} else if (use_input_file) {
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if (optind != (argc - 1)) {
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/* Cannot mix with pathname arguments. */
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usage(argv[0]);
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}
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} else {
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if (optind > (argc - 2))
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usage(argv[0]);
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}
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/* Use our own invalid context checking function so that
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we can support either checking against the active policy or
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checking against a binary policy file. */
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selinux_set_callback(SELINUX_CB_VALIDATE,
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(union selinux_callback)&canoncon);
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if (stat(argv[optind], &sb) < 0) {
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perror(argv[optind]);
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exit(1);
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}
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if (!S_ISREG(sb.st_mode)) {
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fprintf(stderr, "%s: spec file %s is not a regular file.\n",
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argv[0], argv[optind]);
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exit(1);
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}
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altpath = argv[optind];
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optind++;
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}
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/* Load the file contexts configuration and check it. */
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r_opts.selabel_opt_validate = (ctx_validate ? (char *)1 : NULL);
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r_opts.selabel_opt_path = altpath;
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if (nerr)
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exit(1);
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restore_init(&r_opts);
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if (use_input_file) {
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FILE *f = stdin;
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ssize_t len;
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int delim;
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if (strcmp(input_filename, "-") != 0)
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f = fopen(input_filename, "r");
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if (f == NULL) {
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fprintf(stderr, "Unable to open %s: %s\n", input_filename,
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strerror(errno));
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usage(argv[0]);
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}
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__fsetlocking(f, FSETLOCKING_BYCALLER);
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delim = (null_terminated != 0) ? '\0' : '\n';
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while ((len = getdelim(&buf, &buf_len, delim, f)) > 0) {
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buf[len - 1] = 0;
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if (!strcmp(buf, "/"))
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mass_relabel = 1;
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errors |= process_glob(buf, recurse);
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}
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if (strcmp(input_filename, "-") != 0)
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fclose(f);
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} else {
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for (i = optind; i < argc; i++) {
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if (!strcmp(argv[i], "/"))
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mass_relabel = 1;
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errors |= process_glob(argv[i], recurse);
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}
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}
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maybe_audit_mass_relabel(mass_relabel, errors);
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if (warn_no_match)
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selabel_stats(r_opts.hnd);
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selabel_close(r_opts.hnd);
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restore_finish();
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if (r_opts.outfile)
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fclose(r_opts.outfile);
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if (r_opts.progress && r_opts.count >= STAR_COUNT)
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printf("\n");
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exit(errors);
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}
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