| 1 | /*
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| 2 | Copyright (c) 2001-2006, Gerrit Pape
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| 3 | All rights reserved.
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| 4 |
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| 5 | Redistribution and use in source and binary forms, with or without
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| 6 | modification, are permitted provided that the following conditions are met:
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| 7 |
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| 8 | 1. Redistributions of source code must retain the above copyright notice,
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| 9 | this list of conditions and the following disclaimer.
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| 10 | 2. Redistributions in binary form must reproduce the above copyright
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| 11 | notice, this list of conditions and the following disclaimer in the
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| 12 | documentation and/or other materials provided with the distribution.
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| 13 | 3. The name of the author may not be used to endorse or promote products
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| 14 | derived from this software without specific prior written permission.
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| 15 |
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| 16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 26 | */
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| 27 |
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| 28 | /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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| 29 | /* Dependencies on runit_lib.c removed */
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| 30 |
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| 31 | //usage:#define chpst_trivial_usage
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| 32 | //usage: "[-vP012] [-u USER[:GRP]] [-U USER[:GRP]] [-e DIR]\n"
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| 33 | //usage: " [-/ DIR] [-n NICE] [-m BYTES] [-d BYTES] [-o N]\n"
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| 34 | //usage: " [-p N] [-f BYTES] [-c BYTES] PROG ARGS"
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| 35 | //usage:#define chpst_full_usage "\n\n"
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| 36 | //usage: "Change the process state, run PROG\n"
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| 37 | //usage: "\n -u USER[:GRP] Set uid and gid"
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| 38 | //usage: "\n -U USER[:GRP] Set $UID and $GID in environment"
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| 39 | //usage: "\n -e DIR Set environment variables as specified by files"
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| 40 | //usage: "\n in DIR: file=1st_line_of_file"
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| 41 | //usage: "\n -/ DIR Chroot to DIR"
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| 42 | //usage: "\n -n NICE Add NICE to nice value"
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| 43 | //usage: "\n -m BYTES Same as -d BYTES -s BYTES -l BYTES"
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| 44 | //usage: "\n -d BYTES Limit data segment"
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| 45 | //usage: "\n -o N Limit number of open files per process"
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| 46 | //usage: "\n -p N Limit number of processes per uid"
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| 47 | //usage: "\n -f BYTES Limit output file sizes"
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| 48 | //usage: "\n -c BYTES Limit core file size"
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| 49 | //usage: "\n -v Verbose"
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| 50 | //usage: "\n -P Create new process group"
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| 51 | //usage: "\n -0 Close stdin"
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| 52 | //usage: "\n -1 Close stdout"
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| 53 | //usage: "\n -2 Close stderr"
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| 54 | //usage:
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| 55 | //usage:#define envdir_trivial_usage
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| 56 | //usage: "DIR PROG ARGS"
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| 57 | //usage:#define envdir_full_usage "\n\n"
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| 58 | //usage: "Set various environment variables as specified by files\n"
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| 59 | //usage: "in the directory DIR, run PROG"
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| 60 | //usage:
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| 61 | //usage:#define envuidgid_trivial_usage
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| 62 | //usage: "USER PROG ARGS"
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| 63 | //usage:#define envuidgid_full_usage "\n\n"
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| 64 | //usage: "Set $UID to USER's uid and $GID to USER's gid, run PROG"
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| 65 | //usage:
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| 66 | //usage:#define setuidgid_trivial_usage
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| 67 | //usage: "USER PROG ARGS"
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| 68 | //usage:#define setuidgid_full_usage "\n\n"
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| 69 | //usage: "Set uid and gid to USER's uid and gid, drop supplementary group ids,\n"
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| 70 | //usage: "run PROG"
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| 71 | //usage:
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| 72 | //usage:#define softlimit_trivial_usage
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| 73 | //usage: "[-a BYTES] [-m BYTES] [-d BYTES] [-s BYTES] [-l BYTES]\n"
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| 74 | //usage: " [-f BYTES] [-c BYTES] [-r BYTES] [-o N] [-p N] [-t N]\n"
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| 75 | //usage: " PROG ARGS"
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| 76 | //usage:#define softlimit_full_usage "\n\n"
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| 77 | //usage: "Set soft resource limits, then run PROG\n"
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| 78 | //usage: "\n -a BYTES Limit total size of all segments"
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| 79 | //usage: "\n -m BYTES Same as -d BYTES -s BYTES -l BYTES -a BYTES"
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| 80 | //usage: "\n -d BYTES Limit data segment"
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| 81 | //usage: "\n -s BYTES Limit stack segment"
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| 82 | //usage: "\n -l BYTES Limit locked memory size"
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| 83 | //usage: "\n -o N Limit number of open files per process"
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| 84 | //usage: "\n -p N Limit number of processes per uid"
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| 85 | //usage: "\nOptions controlling file sizes:"
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| 86 | //usage: "\n -f BYTES Limit output file sizes"
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| 87 | //usage: "\n -c BYTES Limit core file size"
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| 88 | //usage: "\nEfficiency opts:"
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| 89 | //usage: "\n -r BYTES Limit resident set size"
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| 90 | //usage: "\n -t N Limit CPU time, process receives"
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| 91 | //usage: "\n a SIGXCPU after N seconds"
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| 92 |
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| 93 | #include "libbb.h"
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| 94 | #include <sys/resource.h> /* getrlimit */
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| 95 |
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| 96 | /*
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| 97 | Five applets here: chpst, envdir, envuidgid, setuidgid, softlimit.
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| 98 |
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| 99 | Only softlimit and chpst are taking options:
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| 100 |
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| 101 | # common
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| 102 | -o N Limit number of open files per process
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| 103 | -p N Limit number of processes per uid
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| 104 | -m BYTES Same as -d BYTES -s BYTES -l BYTES [-a BYTES]
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| 105 | -d BYTES Limit data segment
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| 106 | -f BYTES Limit output file sizes
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| 107 | -c BYTES Limit core file size
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| 108 | # softlimit
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| 109 | -a BYTES Limit total size of all segments
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| 110 | -s BYTES Limit stack segment
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| 111 | -l BYTES Limit locked memory size
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| 112 | -r BYTES Limit resident set size
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| 113 | -t N Limit CPU time
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| 114 | # chpst
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| 115 | -u USER[:GRP] Set uid and gid
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| 116 | -U USER[:GRP] Set $UID and $GID in environment
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| 117 | -e DIR Set environment variables as specified by files in DIR
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| 118 | -/ DIR Chroot to DIR
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| 119 | -n NICE Add NICE to nice value
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| 120 | -v Verbose
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| 121 | -P Create new process group
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| 122 | -0 -1 -2 Close fd 0,1,2
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| 123 |
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| 124 | Even though we accept all these options for both softlimit and chpst,
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| 125 | they are not to be advertised on their help texts.
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| 126 | We have enough problems with feature creep in other people's
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| 127 | software, don't want to add our own.
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| 128 |
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| 129 | envdir, envuidgid, setuidgid take no options, but they reuse code which
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| 130 | handles -e, -U and -u.
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| 131 | */
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| 132 |
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| 133 | enum {
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| 134 | OPT_a = (1 << 0) * ENABLE_SOFTLIMIT,
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| 135 | OPT_c = (1 << 1) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 136 | OPT_d = (1 << 2) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 137 | OPT_f = (1 << 3) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 138 | OPT_l = (1 << 4) * ENABLE_SOFTLIMIT,
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| 139 | OPT_m = (1 << 5) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 140 | OPT_o = (1 << 6) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 141 | OPT_p = (1 << 7) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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| 142 | OPT_r = (1 << 8) * ENABLE_SOFTLIMIT,
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| 143 | OPT_s = (1 << 9) * ENABLE_SOFTLIMIT,
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| 144 | OPT_t = (1 << 10) * ENABLE_SOFTLIMIT,
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| 145 | OPT_u = (1 << 11) * (ENABLE_CHPST || ENABLE_SETUIDGID),
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| 146 | OPT_U = (1 << 12) * (ENABLE_CHPST || ENABLE_ENVUIDGID),
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| 147 | OPT_e = (1 << 13) * (ENABLE_CHPST || ENABLE_ENVDIR),
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| 148 | OPT_root = (1 << 14) * ENABLE_CHPST,
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| 149 | OPT_n = (1 << 15) * ENABLE_CHPST,
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| 150 | OPT_v = (1 << 16) * ENABLE_CHPST,
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| 151 | OPT_P = (1 << 17) * ENABLE_CHPST,
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| 152 | OPT_0 = (1 << 18) * ENABLE_CHPST,
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| 153 | OPT_1 = (1 << 19) * ENABLE_CHPST,
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| 154 | OPT_2 = (1 << 20) * ENABLE_CHPST,
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| 155 | };
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| 156 |
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| 157 | /* TODO: use recursive_action? */
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| 158 | static NOINLINE void edir(const char *directory_name)
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| 159 | {
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| 160 | int wdir;
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| 161 | DIR *dir;
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| 162 | struct dirent *d;
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| 163 | int fd;
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| 164 |
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| 165 | wdir = xopen(".", O_RDONLY | O_NDELAY);
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| 166 | xchdir(directory_name);
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| 167 | dir = xopendir(".");
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| 168 | for (;;) {
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| 169 | char buf[256];
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| 170 | char *tail;
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| 171 | int size;
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| 172 |
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| 173 | errno = 0;
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| 174 | d = readdir(dir);
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| 175 | if (!d) {
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| 176 | if (errno)
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| 177 | bb_perror_msg_and_die("readdir %s",
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| 178 | directory_name);
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| 179 | break;
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| 180 | }
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| 181 | if (d->d_name[0] == '.')
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| 182 | continue;
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| 183 | fd = open(d->d_name, O_RDONLY | O_NDELAY);
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| 184 | if (fd < 0) {
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| 185 | if ((errno == EISDIR) && directory_name) {
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| 186 | if (option_mask32 & OPT_v)
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| 187 | bb_perror_msg("warning: %s/%s is a directory",
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| 188 | directory_name, d->d_name);
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| 189 | continue;
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| 190 | }
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| 191 | bb_perror_msg_and_die("open %s/%s",
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| 192 | directory_name, d->d_name);
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| 193 | }
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| 194 | size = full_read(fd, buf, sizeof(buf)-1);
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| 195 | close(fd);
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| 196 | if (size < 0)
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| 197 | bb_perror_msg_and_die("read %s/%s",
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| 198 | directory_name, d->d_name);
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| 199 | if (size == 0) {
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| 200 | unsetenv(d->d_name);
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| 201 | continue;
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| 202 | }
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| 203 | buf[size] = '\n';
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| 204 | tail = strchr(buf, '\n');
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| 205 | /* skip trailing whitespace */
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| 206 | while (1) {
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| 207 | *tail = '\0';
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| 208 | tail--;
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| 209 | if (tail < buf || !isspace(*tail))
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| 210 | break;
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| 211 | }
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| 212 | xsetenv(d->d_name, buf);
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| 213 | }
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| 214 | closedir(dir);
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| 215 | if (fchdir(wdir) == -1)
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| 216 | bb_perror_msg_and_die("fchdir");
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| 217 | close(wdir);
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| 218 | }
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| 219 |
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| 220 | static void limit(int what, long l)
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| 221 | {
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| 222 | struct rlimit r;
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| 223 |
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| 224 | /* Never fails under Linux (except if you pass it bad arguments) */
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| 225 | getrlimit(what, &r);
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| 226 | if ((l < 0) || (l > r.rlim_max))
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| 227 | r.rlim_cur = r.rlim_max;
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| 228 | else
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| 229 | r.rlim_cur = l;
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| 230 | if (setrlimit(what, &r) == -1)
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| 231 | bb_perror_msg_and_die("setrlimit");
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| 232 | }
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| 233 |
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| 234 | int chpst_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 235 | int chpst_main(int argc UNUSED_PARAM, char **argv)
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| 236 | {
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| 237 | struct bb_uidgid_t ugid;
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| 238 | char *set_user = set_user; /* for compiler */
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| 239 | char *env_user = env_user;
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| 240 | char *env_dir = env_dir;
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| 241 | char *root;
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| 242 | char *nicestr;
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| 243 | unsigned limita;
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| 244 | unsigned limitc;
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| 245 | unsigned limitd;
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| 246 | unsigned limitf;
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| 247 | unsigned limitl;
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| 248 | unsigned limitm;
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| 249 | unsigned limito;
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| 250 | unsigned limitp;
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| 251 | unsigned limitr;
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| 252 | unsigned limits;
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| 253 | unsigned limitt;
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| 254 | unsigned opt;
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| 255 |
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| 256 | if ((ENABLE_CHPST && applet_name[0] == 'c')
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| 257 | || (ENABLE_SOFTLIMIT && applet_name[1] == 'o')
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| 258 | ) {
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| 259 | // FIXME: can we live with int-sized limits?
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| 260 | // can we live with 40000 days?
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| 261 | // if yes -> getopt converts strings to numbers for us
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| 262 | opt_complementary = "-1:a+:c+:d+:f+:l+:m+:o+:p+:r+:s+:t+";
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| 263 | opt = getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:u:U:e:"
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| 264 | IF_CHPST("/:n:vP012"),
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| 265 | &limita, &limitc, &limitd, &limitf, &limitl,
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| 266 | &limitm, &limito, &limitp, &limitr, &limits, &limitt,
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| 267 | &set_user, &env_user, &env_dir
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| 268 | IF_CHPST(, &root, &nicestr));
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| 269 | argv += optind;
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| 270 | if (opt & OPT_m) { // -m means -asld
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| 271 | limita = limits = limitl = limitd = limitm;
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| 272 | opt |= (OPT_s | OPT_l | OPT_a | OPT_d);
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| 273 | }
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| 274 | } else {
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| 275 | option_mask32 = opt = 0;
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| 276 | argv++;
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| 277 | if (!*argv)
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| 278 | bb_show_usage();
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| 279 | }
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| 280 |
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| 281 | // envdir?
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| 282 | if (ENABLE_ENVDIR && applet_name[3] == 'd') {
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| 283 | env_dir = *argv++;
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| 284 | opt |= OPT_e;
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| 285 | }
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| 286 |
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| 287 | // setuidgid?
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| 288 | if (ENABLE_SETUIDGID && applet_name[1] == 'e') {
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| 289 | set_user = *argv++;
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| 290 | opt |= OPT_u;
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| 291 | }
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| 292 |
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| 293 | // envuidgid?
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| 294 | if (ENABLE_ENVUIDGID && applet_name[0] == 'e' && applet_name[3] == 'u') {
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| 295 | env_user = *argv++;
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| 296 | opt |= OPT_U;
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| 297 | }
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| 298 |
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| 299 | // we must have PROG [ARGS]
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| 300 | if (!*argv)
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| 301 | bb_show_usage();
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| 302 |
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| 303 | // set limits
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| 304 | if (opt & OPT_d) {
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| 305 | #ifdef RLIMIT_DATA
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| 306 | limit(RLIMIT_DATA, limitd);
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| 307 | #else
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| 308 | if (opt & OPT_v)
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| 309 | bb_error_msg("system does not support RLIMIT_%s",
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| 310 | "DATA");
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| 311 | #endif
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| 312 | }
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| 313 | if (opt & OPT_s) {
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| 314 | #ifdef RLIMIT_STACK
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| 315 | limit(RLIMIT_STACK, limits);
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| 316 | #else
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| 317 | if (opt & OPT_v)
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| 318 | bb_error_msg("system does not support RLIMIT_%s",
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| 319 | "STACK");
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| 320 | #endif
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| 321 | }
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| 322 | if (opt & OPT_l) {
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| 323 | #ifdef RLIMIT_MEMLOCK
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| 324 | limit(RLIMIT_MEMLOCK, limitl);
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| 325 | #else
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| 326 | if (opt & OPT_v)
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| 327 | bb_error_msg("system does not support RLIMIT_%s",
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| 328 | "MEMLOCK");
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| 329 | #endif
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| 330 | }
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| 331 | if (opt & OPT_a) {
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| 332 | #ifdef RLIMIT_VMEM
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| 333 | limit(RLIMIT_VMEM, limita);
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| 334 | #else
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| 335 | #ifdef RLIMIT_AS
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| 336 | limit(RLIMIT_AS, limita);
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| 337 | #else
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| 338 | if (opt & OPT_v)
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| 339 | bb_error_msg("system does not support RLIMIT_%s",
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| 340 | "VMEM");
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| 341 | #endif
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| 342 | #endif
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| 343 | }
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| 344 | if (opt & OPT_o) {
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| 345 | #ifdef RLIMIT_NOFILE
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| 346 | limit(RLIMIT_NOFILE, limito);
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| 347 | #else
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| 348 | #ifdef RLIMIT_OFILE
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| 349 | limit(RLIMIT_OFILE, limito);
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| 350 | #else
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| 351 | if (opt & OPT_v)
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| 352 | bb_error_msg("system does not support RLIMIT_%s",
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| 353 | "NOFILE");
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| 354 | #endif
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| 355 | #endif
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| 356 | }
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| 357 | if (opt & OPT_p) {
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| 358 | #ifdef RLIMIT_NPROC
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| 359 | limit(RLIMIT_NPROC, limitp);
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| 360 | #else
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| 361 | if (opt & OPT_v)
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| 362 | bb_error_msg("system does not support RLIMIT_%s",
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| 363 | "NPROC");
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| 364 | #endif
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| 365 | }
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| 366 | if (opt & OPT_f) {
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| 367 | #ifdef RLIMIT_FSIZE
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| 368 | limit(RLIMIT_FSIZE, limitf);
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| 369 | #else
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| 370 | if (opt & OPT_v)
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| 371 | bb_error_msg("system does not support RLIMIT_%s",
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| 372 | "FSIZE");
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| 373 | #endif
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| 374 | }
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| 375 | if (opt & OPT_c) {
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| 376 | #ifdef RLIMIT_CORE
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| 377 | limit(RLIMIT_CORE, limitc);
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| 378 | #else
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| 379 | if (opt & OPT_v)
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| 380 | bb_error_msg("system does not support RLIMIT_%s",
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| 381 | "CORE");
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| 382 | #endif
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| 383 | }
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| 384 | if (opt & OPT_r) {
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| 385 | #ifdef RLIMIT_RSS
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| 386 | limit(RLIMIT_RSS, limitr);
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| 387 | #else
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| 388 | if (opt & OPT_v)
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| 389 | bb_error_msg("system does not support RLIMIT_%s",
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| 390 | "RSS");
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| 391 | #endif
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| 392 | }
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| 393 | if (opt & OPT_t) {
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| 394 | #ifdef RLIMIT_CPU
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| 395 | limit(RLIMIT_CPU, limitt);
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| 396 | #else
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| 397 | if (opt & OPT_v)
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| 398 | bb_error_msg("system does not support RLIMIT_%s",
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| 399 | "CPU");
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| 400 | #endif
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| 401 | }
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| 402 |
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| 403 | if (opt & OPT_P)
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| 404 | setsid();
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| 405 |
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| 406 | if (opt & OPT_e)
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| 407 | edir(env_dir);
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| 408 |
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| 409 | if (opt & (OPT_u|OPT_U))
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| 410 | xget_uidgid(&ugid, set_user);
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| 411 |
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| 412 | // chrooted jail must have /etc/passwd if we move this after chroot.
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| 413 | // OTOH chroot fails for non-roots.
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| 414 | // Solution: cache uid/gid before chroot, apply uid/gid after.
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| 415 | if (opt & OPT_U) {
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| 416 | xsetenv("GID", utoa(ugid.gid));
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| 417 | xsetenv("UID", utoa(ugid.uid));
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| 418 | }
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| 419 |
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| 420 | if (opt & OPT_root) {
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| 421 | xchroot(root);
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| 422 | }
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| 423 |
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| 424 | if (opt & OPT_u) {
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| 425 | if (setgroups(1, &ugid.gid) == -1)
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| 426 | bb_perror_msg_and_die("setgroups");
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| 427 | xsetgid(ugid.gid);
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| 428 | xsetuid(ugid.uid);
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| 429 | }
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| 430 |
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| 431 | if (opt & OPT_n) {
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|---|
| 432 | errno = 0;
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|---|
| 433 | if (nice(xatoi(nicestr)) == -1)
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| 434 | bb_perror_msg_and_die("nice");
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| 435 | }
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| 436 |
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| 437 | if (opt & OPT_0)
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| 438 | close(STDIN_FILENO);
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| 439 | if (opt & OPT_1)
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| 440 | close(STDOUT_FILENO);
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| 441 | if (opt & OPT_2)
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|---|
| 442 | close(STDERR_FILENO);
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| 443 |
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|---|
| 444 | BB_EXECVP_or_die(argv);
|
|---|
| 445 | }
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