[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini chmod implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
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| 8 | * to correctly parse '-rwxgoa'
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 11 | */
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| 12 |
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| 13 | /* BB_AUDIT SUSv3 compliant */
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[1770] | 14 | /* BB_AUDIT GNU defects - unsupported long options. */
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[821] | 15 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
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| 16 |
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[1770] | 17 | #include "libbb.h"
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[821] | 18 |
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[1770] | 19 | /* This is a NOEXEC applet. Be very careful! */
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| 20 |
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| 21 |
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| 22 | #define OPT_RECURSE (option_mask32 & 1)
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| 23 | #define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
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| 24 | #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
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| 25 | #define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
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| 26 | #define OPT_STR "R" USE_DESKTOP("vcf")
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| 27 |
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| 28 | /* coreutils:
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| 29 | * chmod never changes the permissions of symbolic links; the chmod
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| 30 | * system call cannot change their permissions. This is not a problem
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| 31 | * since the permissions of symbolic links are never used.
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| 32 | * However, for each symbolic link listed on the command line, chmod changes
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| 33 | * the permissions of the pointed-to file. In contrast, chmod ignores
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| 34 | * symbolic links encountered during recursive directory traversals.
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| 35 | */
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| 36 |
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| 37 | static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
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[821] | 38 | {
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[1770] | 39 | mode_t newmode;
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| 40 |
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| 41 | /* match coreutils behavior */
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| 42 | if (depth == 0) {
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| 43 | /* statbuf holds lstat result, but we need stat (follow link) */
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| 44 | if (stat(fileName, statbuf))
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| 45 | goto err;
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| 46 | } else { /* depth > 0: skip links */
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| 47 | if (S_ISLNK(statbuf->st_mode))
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| 48 | return TRUE;
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| 49 | }
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| 50 | newmode = statbuf->st_mode;
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| 51 |
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| 52 | if (!bb_parse_mode((char *)param, &newmode))
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| 53 | bb_error_msg_and_die("invalid mode: %s", (char *)param);
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| 54 |
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| 55 | if (chmod(fileName, newmode) == 0) {
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| 56 | if (OPT_VERBOSE
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| 57 | || (OPT_CHANGED && statbuf->st_mode != newmode)
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| 58 | ) {
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| 59 | printf("mode of '%s' changed to %04o (%s)\n", fileName,
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| 60 | newmode & 07777, bb_mode_string(newmode)+1);
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| 61 | }
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| 62 | return TRUE;
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| 63 | }
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| 64 | err:
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| 65 | if (!OPT_QUIET)
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| 66 | bb_perror_msg("%s", fileName);
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| 67 | return FALSE;
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[821] | 68 | }
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| 69 |
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[1770] | 70 | int chmod_main(int argc, char **argv);
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| 71 | int chmod_main(int argc, char **argv)
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[821] | 72 | {
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| 73 | int retval = EXIT_SUCCESS;
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[1770] | 74 | char *arg, **argp;
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[821] | 75 | char *smode;
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| 76 |
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[1770] | 77 | /* Convert first encountered -r into ar, -w into aw etc
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| 78 | * so that getopt would not eat it */
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| 79 | argp = argv;
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| 80 | while ((arg = *++argp)) {
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| 81 | /* Mode spec must be the first arg (sans -R etc) */
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| 82 | /* (protect against mishandling e.g. "chmod 644 -r") */
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| 83 | if (arg[0] != '-') {
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| 84 | arg = NULL;
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| 85 | break;
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[821] | 86 | }
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[1770] | 87 | /* An option. Not a -- or valid option? */
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| 88 | if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
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| 89 | arg[0] = 'a';
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| 90 | break;
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| 91 | }
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[821] | 92 | }
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| 93 |
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[1770] | 94 | /* Parse options */
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| 95 | opt_complementary = "-2";
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| 96 | getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
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| 97 | argv += optind;
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[821] | 98 |
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[1770] | 99 | /* Restore option-like mode if needed */
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| 100 | if (arg) arg[0] = '-';
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[821] | 101 |
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| 102 | /* Ok, ready to do the deed now */
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[1770] | 103 | smode = *argv++;
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[821] | 104 | do {
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[1770] | 105 | if (!recursive_action(*argv,
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| 106 | OPT_RECURSE, // recurse
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| 107 | fileAction, // file action
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| 108 | fileAction, // dir action
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| 109 | smode, // user data
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| 110 | 0) // depth
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| 111 | ) {
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[821] | 112 | retval = EXIT_FAILURE;
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| 113 | }
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| 114 | } while (*++argv);
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| 115 |
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| 116 | return retval;
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| 117 | }
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[1770] | 118 |
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| 119 | /*
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| 120 | Security: chmod is too important and too subtle.
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| 121 | This is a test script (busybox chmod versus coreutils).
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| 122 | Run it in empty directory.
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| 123 |
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| 124 | #!/bin/sh
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| 125 | t1="/tmp/busybox chmod"
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| 126 | t2="/usr/bin/chmod"
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| 127 | create() {
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| 128 | rm -rf $1; mkdir $1
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| 129 | (
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| 130 | cd $1 || exit 1
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| 131 | mkdir dir
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| 132 | >up
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| 133 | >file
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| 134 | >dir/file
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| 135 | ln -s dir linkdir
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| 136 | ln -s file linkfile
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| 137 | ln -s ../up dir/up
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| 138 | )
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| 139 | }
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| 140 | tst() {
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| 141 | (cd test1; $t1 $1)
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| 142 | (cd test2; $t2 $1)
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| 143 | (cd test1; ls -lR) >out1
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| 144 | (cd test2; ls -lR) >out2
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| 145 | echo "chmod $1" >out.diff
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| 146 | if ! diff -u out1 out2 >>out.diff; then exit 1; fi
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| 147 | rm out.diff
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| 148 | }
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| 149 | echo "If script produced 'out.diff' file, then at least one testcase failed"
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| 150 | create test1; create test2
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| 151 | tst "a+w file"
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| 152 | tst "a-w dir"
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| 153 | tst "a+w linkfile"
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| 154 | tst "a-w linkdir"
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| 155 | tst "-R a+w file"
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| 156 | tst "-R a-w dir"
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| 157 | tst "-R a+w linkfile"
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| 158 | tst "-R a-w linkdir"
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| 159 | tst "a-r,a+x linkfile"
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| 160 | */
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