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682 lines
17 KiB
C
682 lines
17 KiB
C
/*
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setfiles: based on policycoreutils 2.0.19
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policycoreutils was released under GPL 2.
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Port to BusyBox (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
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*/
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//usage:#define setfiles_trivial_usage
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//usage: "[-dnpqsvW] [-e DIR]... [-o FILE] [-r alt_root_path]"
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//usage: IF_FEATURE_SETFILES_CHECK_OPTION(
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//usage: " [-c policyfile] spec_file"
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//usage: )
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//usage: " pathname"
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//usage:#define setfiles_full_usage "\n\n"
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//usage: "Reset file contexts under pathname according to spec_file\n"
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//usage: IF_FEATURE_SETFILES_CHECK_OPTION(
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//usage: "\n -c FILE Check the validity of the contexts against the specified binary policy"
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//usage: )
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//usage: "\n -d Show which specification matched each file"
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//usage: "\n -l Log changes in file labels to syslog"
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//usage: "\n -n Don't change any file labels"
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//usage: "\n -q Suppress warnings"
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//usage: "\n -r DIR Use an alternate root path"
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//usage: "\n -e DIR Exclude DIR"
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//usage: "\n -F Force reset of context to match file_context for customizable files"
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//usage: "\n -o FILE Save list of files with incorrect context"
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//usage: "\n -s Take a list of files from stdin (instead of command line)"
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//usage: "\n -v Show changes in file labels, if type or role are changing"
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//usage: "\n -vv Show changes in file labels, if type, role, or user are changing"
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//usage: "\n -W Display warnings about entries that had no matching files"
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//usage:
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//usage:#define restorecon_trivial_usage
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//usage: "[-iFnRv] [-e EXCLUDEDIR]... [-o FILE] [-f FILE]"
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//usage:#define restorecon_full_usage "\n\n"
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//usage: "Reset security contexts of files in pathname\n"
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//usage: "\n -i Ignore files that don't exist"
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//usage: "\n -f FILE File with list of files to process"
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//usage: "\n -e DIR Directory to exclude"
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//usage: "\n -R,-r Recurse"
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//usage: "\n -n Don't change any file labels"
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//usage: "\n -o FILE Save list of files with incorrect context"
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//usage: "\n -v Verbose"
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//usage: "\n -vv Show changed labels"
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//usage: "\n -F Force reset of context to match file_context"
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//usage: "\n for customizable files, or the user section,"
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//usage: "\n if it has changed"
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#include "libbb.h"
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#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
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#include <sepol/sepol.h>
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#endif
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#define MAX_EXCLUDES 50
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struct edir {
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char *directory;
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size_t size;
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};
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struct globals {
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FILE *outfile;
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char *policyfile;
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char *rootpath;
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int rootpathlen;
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unsigned count;
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int excludeCtr;
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int errors;
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int verbose; /* getopt32 uses it, has to be int */
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smallint recurse; /* Recursive descent */
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smallint follow_mounts;
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/* Behavior flags determined based on setfiles vs. restorecon */
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smallint expand_realpath; /* Expand paths via realpath */
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smallint abort_on_error; /* Abort the file tree walk upon an error */
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int add_assoc; /* Track inode associations for conflict detection */
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int matchpathcon_flags; /* Flags to matchpathcon */
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dev_t dev_id; /* Device id where target file exists */
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int nerr;
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struct edir excludeArray[MAX_EXCLUDES];
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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void BUG_setfiles_globals_too_big(void);
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#define INIT_G() do { \
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if (sizeof(G) > COMMON_BUFSIZE) \
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BUG_setfiles_globals_too_big(); \
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/* memset(&G, 0, sizeof(G)); - already is */ \
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} while (0)
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#define outfile (G.outfile )
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#define policyfile (G.policyfile )
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#define rootpath (G.rootpath )
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#define rootpathlen (G.rootpathlen )
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#define count (G.count )
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#define excludeCtr (G.excludeCtr )
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#define errors (G.errors )
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#define verbose (G.verbose )
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#define recurse (G.recurse )
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#define follow_mounts (G.follow_mounts )
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#define expand_realpath (G.expand_realpath )
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#define abort_on_error (G.abort_on_error )
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#define add_assoc (G.add_assoc )
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#define matchpathcon_flags (G.matchpathcon_flags)
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#define dev_id (G.dev_id )
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#define nerr (G.nerr )
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#define excludeArray (G.excludeArray )
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/* Must match getopt32 string! */
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enum {
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OPT_d = (1 << 0),
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OPT_e = (1 << 1),
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OPT_f = (1 << 2),
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OPT_i = (1 << 3),
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OPT_l = (1 << 4),
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OPT_n = (1 << 5),
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OPT_p = (1 << 6),
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OPT_q = (1 << 7),
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OPT_r = (1 << 8),
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OPT_s = (1 << 9),
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OPT_v = (1 << 10),
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OPT_o = (1 << 11),
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OPT_F = (1 << 12),
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OPT_W = (1 << 13),
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OPT_c = (1 << 14), /* c only for setfiles */
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OPT_R = (1 << 14), /* R only for restorecon */
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};
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#define FLAG_d_debug (option_mask32 & OPT_d)
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#define FLAG_e (option_mask32 & OPT_e)
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#define FLAG_f (option_mask32 & OPT_f)
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#define FLAG_i_ignore_enoent (option_mask32 & OPT_i)
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#define FLAG_l_take_log (option_mask32 & OPT_l)
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#define FLAG_n_dry_run (option_mask32 & OPT_n)
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#define FLAG_p_progress (option_mask32 & OPT_p)
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#define FLAG_q_quiet (option_mask32 & OPT_q)
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#define FLAG_r (option_mask32 & OPT_r)
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#define FLAG_s (option_mask32 & OPT_s)
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#define FLAG_v (option_mask32 & OPT_v)
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#define FLAG_o (option_mask32 & OPT_o)
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#define FLAG_F_force (option_mask32 & OPT_F)
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#define FLAG_W_warn_no_match (option_mask32 & OPT_W)
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#define FLAG_c (option_mask32 & OPT_c)
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#define FLAG_R (option_mask32 & OPT_R)
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static void qprintf(const char *fmt UNUSED_PARAM, ...)
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{
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/* quiet, do nothing */
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}
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static void inc_err(void)
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{
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nerr++;
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if (nerr > 9 && !FLAG_d_debug) {
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bb_error_msg_and_die("exiting after 10 errors");
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}
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}
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static void add_exclude(const char *directory)
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{
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struct stat sb;
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size_t len;
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if (directory == NULL || directory[0] != '/') {
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bb_error_msg_and_die("full path required for exclude: %s", directory);
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}
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if (lstat(directory, &sb)) {
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bb_error_msg("directory \"%s\" not found, ignoring", directory);
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return;
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}
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if ((sb.st_mode & S_IFDIR) == 0) {
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bb_error_msg("\"%s\" is not a directory: mode %o, ignoring",
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directory, sb.st_mode);
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return;
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}
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if (excludeCtr == MAX_EXCLUDES) {
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bb_error_msg_and_die("maximum excludes %d exceeded", MAX_EXCLUDES);
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}
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len = strlen(directory);
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while (len > 1 && directory[len - 1] == '/') {
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len--;
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}
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excludeArray[excludeCtr].directory = xstrndup(directory, len);
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excludeArray[excludeCtr++].size = len;
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}
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static bool exclude(const char *file)
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{
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int i = 0;
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for (i = 0; i < excludeCtr; i++) {
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if (strncmp(file, excludeArray[i].directory,
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excludeArray[i].size) == 0) {
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if (file[excludeArray[i].size] == '\0'
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|| file[excludeArray[i].size] == '/') {
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return 1;
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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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static int match(const char *name, struct stat *sb, char **con)
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{
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int ret;
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char path[PATH_MAX + 1];
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char *tmp_path = xstrdup(name);
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if (excludeCtr > 0 && exclude(name)) {
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goto err;
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}
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ret = lstat(name, sb);
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if (ret) {
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if (FLAG_i_ignore_enoent && errno == ENOENT) {
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free(tmp_path);
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return 0;
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}
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bb_error_msg("stat(%s)", name);
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goto err;
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}
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if (expand_realpath) {
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if (S_ISLNK(sb->st_mode)) {
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char *p = NULL;
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char *file_sep;
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size_t len = 0;
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if (verbose > 1)
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bb_error_msg("warning! %s refers to a symbolic link, not following last component", name);
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file_sep = strrchr(tmp_path, '/');
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if (file_sep == tmp_path) {
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file_sep++;
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path[0] = '\0';
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p = path;
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} else if (file_sep) {
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*file_sep++ = '\0';
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p = realpath(tmp_path, path);
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} else {
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file_sep = tmp_path;
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p = realpath("./", path);
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}
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if (p)
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len = strlen(p);
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if (!p || len + strlen(file_sep) + 2 > PATH_MAX) {
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bb_perror_msg("realpath(%s) failed", name);
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goto err;
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}
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p += len;
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/* ensure trailing slash of directory name */
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if (len == 0 || p[-1] != '/') {
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*p++ = '/';
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}
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strcpy(p, file_sep);
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name = path;
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if (excludeCtr > 0 && exclude(name))
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goto err;
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} else {
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char *p;
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p = realpath(name, path);
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if (!p) {
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bb_perror_msg("realpath(%s)", name);
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goto err;
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}
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name = p;
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if (excludeCtr > 0 && exclude(name))
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goto err;
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}
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}
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/* name will be what is matched in the policy */
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if (NULL != rootpath) {
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if (0 != strncmp(rootpath, name, rootpathlen)) {
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bb_error_msg("%s is not located in %s",
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name, rootpath);
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goto err;
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}
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name += rootpathlen;
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}
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free(tmp_path);
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if (rootpath != NULL && name[0] == '\0')
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/* this is actually the root dir of the alt root */
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return matchpathcon_index("/", sb->st_mode, con);
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return matchpathcon_index(name, sb->st_mode, con);
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err:
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free(tmp_path);
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return -1;
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}
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/* Compare two contexts to see if their differences are "significant",
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* or whether the only difference is in the user. */
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static bool only_changed_user(const char *a, const char *b)
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{
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if (FLAG_F_force)
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return 0;
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if (!a || !b)
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return 0;
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a = strchr(a, ':'); /* Rest of the context after the user */
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b = strchr(b, ':');
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if (!a || !b)
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return 0;
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return (strcmp(a, b) == 0);
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}
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static int restore(const char *file)
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{
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char *my_file;
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struct stat my_sb;
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int i, j, ret;
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char *context = NULL;
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char *newcon = NULL;
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bool user_only_changed = 0;
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int retval = 0;
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my_file = bb_simplify_path(file);
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i = match(my_file, &my_sb, &newcon);
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if (i < 0) /* No matching specification. */
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goto out;
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if (FLAG_p_progress) {
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count++;
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if (count % 0x400 == 0) { /* every 1024 times */
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count = (count % (80*0x400));
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if (count == 0)
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bb_putchar('\n');
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bb_putchar('*');
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fflush_all();
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}
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}
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/*
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* Try to add an association between this inode and
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* this specification. If there is already an association
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* for this inode and it conflicts with this specification,
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* then use the last matching specification.
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*/
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if (add_assoc) {
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j = matchpathcon_filespec_add(my_sb.st_ino, i, my_file);
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if (j < 0)
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goto err;
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if (j != i) {
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/* There was already an association and it took precedence. */
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goto out;
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}
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}
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if (FLAG_d_debug)
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printf("%s: %s matched by %s\n", applet_name, my_file, newcon);
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/* Get the current context of the file. */
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ret = lgetfilecon_raw(my_file, &context);
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if (ret < 0) {
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if (errno == ENODATA) {
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context = NULL; /* paranoia */
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} else {
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bb_perror_msg("lgetfilecon_raw on %s", my_file);
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goto err;
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}
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user_only_changed = 0;
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} else
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user_only_changed = only_changed_user(context, newcon);
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/*
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* Do not relabel the file if the matching specification is
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* <<none>> or the file is already labeled according to the
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* specification.
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*/
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if ((strcmp(newcon, "<<none>>") == 0)
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|| (context && (strcmp(context, newcon) == 0) && !FLAG_F_force)) {
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goto out;
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}
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if (!FLAG_F_force && context && (is_context_customizable(context) > 0)) {
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if (verbose > 1) {
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bb_error_msg("skipping %s. %s is customizable_types",
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my_file, context);
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}
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goto out;
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}
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if (verbose) {
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/* If we're just doing "-v", trim out any relabels where
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* the user has changed but the role and type are the
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* same. For "-vv", emit everything. */
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if (verbose > 1 || !user_only_changed) {
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bb_info_msg("%s: reset %s context %s->%s",
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applet_name, my_file, context ? context : "", newcon);
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}
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}
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if (FLAG_l_take_log && !user_only_changed) {
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if (context)
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bb_info_msg("relabeling %s from %s to %s", my_file, context, newcon);
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else
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bb_info_msg("labeling %s to %s", my_file, newcon);
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}
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if (outfile && !user_only_changed)
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fprintf(outfile, "%s\n", my_file);
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/*
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* Do not relabel the file if -n was used.
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*/
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if (FLAG_n_dry_run || user_only_changed)
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goto out;
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/*
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* Relabel the file to the specified context.
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*/
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ret = lsetfilecon(my_file, newcon);
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if (ret) {
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bb_perror_msg("lsetfileconon(%s,%s)", my_file, newcon);
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goto err;
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}
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out:
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freecon(context);
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freecon(newcon);
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free(my_file);
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return retval;
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err:
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retval--; /* -1 */
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goto out;
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}
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/*
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* Apply the last matching specification to a file.
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* This function is called by recursive_action on each file during
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* the directory traversal.
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*/
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static int FAST_FUNC apply_spec(
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const char *file,
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struct stat *sb,
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void *userData UNUSED_PARAM,
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int depth UNUSED_PARAM)
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{
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if (!follow_mounts) {
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/* setfiles does not process across different mount points */
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if (sb->st_dev != dev_id) {
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return SKIP;
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}
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}
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errors |= restore(file);
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if (abort_on_error && errors)
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return FALSE;
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return TRUE;
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}
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static int canoncon(const char *path, unsigned lineno, char **contextp)
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{
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static const char err_msg[] ALIGN1 = "%s: line %u has invalid context %s";
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char *tmpcon;
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char *context = *contextp;
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int invalid = 0;
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#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
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if (policyfile) {
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if (sepol_check_context(context) >= 0)
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return 0;
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/* Exit immediately if we're in checking mode. */
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bb_error_msg_and_die(err_msg, path, lineno, context);
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}
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#endif
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if (security_canonicalize_context_raw(context, &tmpcon) < 0) {
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if (errno != ENOENT) {
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invalid = 1;
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inc_err();
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}
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} else {
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free(context);
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*contextp = tmpcon;
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}
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if (invalid) {
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bb_error_msg(err_msg, path, lineno, context);
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}
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return invalid;
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}
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static int process_one(char *name)
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{
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struct stat sb;
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int rc;
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rc = lstat(name, &sb);
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if (rc < 0) {
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if (FLAG_i_ignore_enoent && errno == ENOENT)
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return 0;
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bb_perror_msg("stat(%s)", name);
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goto err;
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}
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dev_id = sb.st_dev;
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if (S_ISDIR(sb.st_mode) && recurse) {
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if (recursive_action(name,
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ACTION_RECURSE,
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apply_spec,
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apply_spec,
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NULL, 0) != TRUE
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) {
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bb_error_msg("error while labeling %s", name);
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goto err;
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}
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} else {
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rc = restore(name);
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if (rc)
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goto err;
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}
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out:
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if (add_assoc) {
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|
if (FLAG_q_quiet)
|
|
set_matchpathcon_printf(&qprintf);
|
|
matchpathcon_filespec_eval();
|
|
set_matchpathcon_printf(NULL);
|
|
matchpathcon_filespec_destroy();
|
|
}
|
|
|
|
return rc;
|
|
|
|
err:
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
|
|
int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int setfiles_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct stat sb;
|
|
int rc, i = 0;
|
|
const char *input_filename = NULL;
|
|
char *buf = NULL;
|
|
size_t buf_len;
|
|
int flags;
|
|
llist_t *exclude_dir = NULL;
|
|
char *out_filename = NULL;
|
|
|
|
INIT_G();
|
|
|
|
if (applet_name[0] == 's') { /* "setfiles" */
|
|
/*
|
|
* setfiles:
|
|
* Recursive descent,
|
|
* Does not expand paths via realpath,
|
|
* Aborts on errors during the file tree walk,
|
|
* Try to track inode associations for conflict detection,
|
|
* Does not follow mounts,
|
|
* Validates all file contexts at init time.
|
|
*/
|
|
recurse = 1;
|
|
abort_on_error = 1;
|
|
add_assoc = 1;
|
|
/* follow_mounts = 0; - already is */
|
|
matchpathcon_flags = MATCHPATHCON_VALIDATE | MATCHPATHCON_NOTRANS;
|
|
} else {
|
|
/*
|
|
* restorecon:
|
|
* No recursive descent unless -r/-R,
|
|
* Expands paths via realpath,
|
|
* Do not abort on errors during the file tree walk,
|
|
* Do not try to track inode associations for conflict detection,
|
|
* Follows mounts,
|
|
* Does lazy validation of contexts upon use.
|
|
*/
|
|
expand_realpath = 1;
|
|
follow_mounts = 1;
|
|
matchpathcon_flags = MATCHPATHCON_NOTRANS;
|
|
/* restorecon only */
|
|
selinux_or_die();
|
|
}
|
|
|
|
set_matchpathcon_flags(matchpathcon_flags);
|
|
|
|
opt_complementary = "e::vv:v--p:p--v:v--q:q--v";
|
|
/* Option order must match OPT_x definitions! */
|
|
if (applet_name[0] == 'r') { /* restorecon */
|
|
flags = getopt32(argv, "de:f:ilnpqrsvo:FWR",
|
|
&exclude_dir, &input_filename, &out_filename, &verbose);
|
|
} else { /* setfiles */
|
|
flags = getopt32(argv, "de:f:ilnpqr:svo:FW"
|
|
IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
|
|
&exclude_dir, &input_filename, &rootpath, &out_filename,
|
|
IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
|
|
&verbose);
|
|
}
|
|
argv += optind;
|
|
|
|
#if ENABLE_FEATURE_SETFILES_CHECK_OPTION
|
|
if ((applet_name[0] == 's') && (flags & OPT_c)) {
|
|
FILE *policystream;
|
|
|
|
policystream = xfopen_for_read(policyfile);
|
|
if (sepol_set_policydb_from_file(policystream) < 0) {
|
|
bb_error_msg_and_die("sepol_set_policydb_from_file on %s", policyfile);
|
|
}
|
|
fclose(policystream);
|
|
|
|
/* Only process the specified file_contexts file, not
|
|
* any .homedirs or .local files, and do not perform
|
|
* context translations. */
|
|
set_matchpathcon_flags(MATCHPATHCON_BASEONLY |
|
|
MATCHPATHCON_NOTRANS |
|
|
MATCHPATHCON_VALIDATE);
|
|
}
|
|
#endif
|
|
|
|
while (exclude_dir)
|
|
add_exclude(llist_pop(&exclude_dir));
|
|
|
|
if (flags & OPT_o) {
|
|
outfile = stdout;
|
|
if (NOT_LONE_CHAR(out_filename, '-')) {
|
|
outfile = xfopen_for_write(out_filename);
|
|
}
|
|
}
|
|
if (applet_name[0] == 'r') { /* restorecon */
|
|
if (flags & (OPT_r | OPT_R))
|
|
recurse = 1;
|
|
} else { /* setfiles */
|
|
if (flags & OPT_r)
|
|
rootpathlen = strlen(rootpath);
|
|
}
|
|
if (flags & OPT_s) {
|
|
input_filename = "-";
|
|
add_assoc = 0;
|
|
}
|
|
|
|
if (applet_name[0] == 's') { /* setfiles */
|
|
/* Use our own invalid context checking function so that
|
|
* we can support either checking against the active policy or
|
|
* checking against a binary policy file. */
|
|
set_matchpathcon_canoncon(&canoncon);
|
|
if (!argv[0])
|
|
bb_show_usage();
|
|
xstat(argv[0], &sb);
|
|
if (!S_ISREG(sb.st_mode)) {
|
|
bb_error_msg_and_die("spec file %s is not a regular file", argv[0]);
|
|
}
|
|
/* Load the file contexts configuration and check it. */
|
|
rc = matchpathcon_init(argv[0]);
|
|
if (rc < 0) {
|
|
bb_simple_perror_msg_and_die(argv[0]);
|
|
}
|
|
if (nerr)
|
|
exit(EXIT_FAILURE);
|
|
argv++;
|
|
}
|
|
|
|
if (input_filename) {
|
|
ssize_t len;
|
|
FILE *f = stdin;
|
|
|
|
if (NOT_LONE_CHAR(input_filename, '-'))
|
|
f = xfopen_for_read(input_filename);
|
|
while ((len = getline(&buf, &buf_len, f)) > 0) {
|
|
buf[len - 1] = '\0';
|
|
errors |= process_one(buf);
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
fclose_if_not_stdin(f);
|
|
} else {
|
|
if (!argv[0])
|
|
bb_show_usage();
|
|
for (i = 0; argv[i]; i++) {
|
|
errors |= process_one(argv[i]);
|
|
}
|
|
}
|
|
|
|
if (FLAG_W_warn_no_match)
|
|
matchpathcon_checkmatches(argv[0]);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP && outfile)
|
|
fclose(outfile);
|
|
|
|
return errors;
|
|
}
|