mirror of
https://github.com/sheumann/hush.git
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389 lines
9.6 KiB
C
389 lines
9.6 KiB
C
/*
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Copyright (c) 2001-2006, Gerrit Pape
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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/* Dependencies on runit_lib.c removed */
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#include "libbb.h"
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#include <dirent.h>
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/*
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Five applets here: chpst, envdir, envuidgid, setuidgid, softlimit.
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Only softlimit and chpst are taking options:
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# common
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-o N Limit number of open files per process
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-p N Limit number of processes per uid
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-m BYTES Same as -d BYTES -s BYTES -l BYTES [-a BYTES]
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-d BYTES Limit data segment
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-f BYTES Limit output file sizes
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-c BYTES Limit core file size
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# softlimit
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-a BYTES Limit total size of all segments
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-s BYTES Limit stack segment
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-l BYTES Limit locked memory size
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-r BYTES Limit resident set size
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-t N Limit CPU time
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# chpst
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-u USER[:GRP] Set uid and gid
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-U USER[:GRP] Set $UID and $GID in environment
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-e DIR Set environment variables as specified by files in DIR
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-/ DIR Chroot to DIR
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-n NICE Add NICE to nice value
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-v Verbose
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-P Create new process group
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-0 -1 -2 Close fd 0,1,2
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Even though we accept all these options for both softlimit and chpst,
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they are not to be advertised on their help texts.
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We have enough problems with feature creep in other people's
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software, don't want to add our own.
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envdir, envuidgid, setuidgid take no options, but they reuse code which
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handles -e, -U and -u.
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*/
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enum {
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OPT_a = (1 << 0) * ENABLE_SOFTLIMIT,
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OPT_c = (1 << 1) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_d = (1 << 2) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_f = (1 << 3) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_l = (1 << 4) * ENABLE_SOFTLIMIT,
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OPT_m = (1 << 5) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_o = (1 << 6) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_p = (1 << 7) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
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OPT_r = (1 << 8) * ENABLE_SOFTLIMIT,
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OPT_s = (1 << 9) * ENABLE_SOFTLIMIT,
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OPT_t = (1 << 10) * ENABLE_SOFTLIMIT,
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OPT_u = (1 << 11) * (ENABLE_CHPST || ENABLE_SETUIDGID),
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OPT_U = (1 << 12) * (ENABLE_CHPST || ENABLE_ENVUIDGID),
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OPT_e = (1 << 13) * (ENABLE_CHPST || ENABLE_ENVDIR),
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OPT_root = (1 << 14) * ENABLE_CHPST,
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OPT_n = (1 << 15) * ENABLE_CHPST,
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OPT_v = (1 << 16) * ENABLE_CHPST,
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OPT_P = (1 << 17) * ENABLE_CHPST,
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OPT_0 = (1 << 18) * ENABLE_CHPST,
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OPT_1 = (1 << 19) * ENABLE_CHPST,
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OPT_2 = (1 << 20) * ENABLE_CHPST,
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};
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static void edir(const char *directory_name)
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{
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int wdir;
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DIR *dir;
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struct dirent *d;
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int fd;
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wdir = xopen(".", O_RDONLY | O_NDELAY);
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xchdir(directory_name);
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dir = opendir(".");
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if (!dir)
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bb_perror_msg_and_die("opendir %s", directory_name);
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for (;;) {
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char buf[256];
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char *tail;
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int size;
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errno = 0;
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d = readdir(dir);
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if (!d) {
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if (errno)
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bb_perror_msg_and_die("readdir %s",
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directory_name);
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break;
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}
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if (d->d_name[0] == '.')
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continue;
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fd = open(d->d_name, O_RDONLY | O_NDELAY);
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if (fd < 0) {
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if ((errno == EISDIR) && directory_name) {
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if (option_mask32 & OPT_v)
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bb_perror_msg("warning: %s/%s is a directory",
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directory_name, d->d_name);
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continue;
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} else
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bb_perror_msg_and_die("open %s/%s",
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directory_name, d->d_name);
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}
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size = full_read(fd, buf, sizeof(buf)-1);
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close(fd);
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if (size < 0)
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bb_perror_msg_and_die("read %s/%s",
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directory_name, d->d_name);
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if (size == 0) {
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unsetenv(d->d_name);
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continue;
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}
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buf[size] = '\n';
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tail = strchr(buf, '\n');
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/* skip trailing whitespace */
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while (1) {
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*tail = '\0';
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tail--;
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if (tail < buf || !isspace(*tail))
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break;
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}
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xsetenv(d->d_name, buf);
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}
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closedir(dir);
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if (fchdir(wdir) == -1)
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bb_perror_msg_and_die("fchdir");
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close(wdir);
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}
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static void limit(int what, long l)
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{
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struct rlimit r;
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/* Never fails under Linux (except if you pass it bad arguments) */
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getrlimit(what, &r);
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if ((l < 0) || (l > r.rlim_max))
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r.rlim_cur = r.rlim_max;
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else
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r.rlim_cur = l;
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if (setrlimit(what, &r) == -1)
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bb_perror_msg_and_die("setrlimit");
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}
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int chpst_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int chpst_main(int argc UNUSED_PARAM, char **argv)
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{
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struct bb_uidgid_t ugid;
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char *set_user = set_user; /* for compiler */
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char *env_user = env_user;
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char *env_dir = env_dir;
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char *root;
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char *nicestr;
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unsigned limita;
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unsigned limitc;
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unsigned limitd;
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unsigned limitf;
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unsigned limitl;
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unsigned limitm;
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unsigned limito;
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unsigned limitp;
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unsigned limitr;
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unsigned limits;
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unsigned limitt;
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unsigned opt;
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if ((ENABLE_CHPST && applet_name[0] == 'c')
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|| (ENABLE_SOFTLIMIT && applet_name[1] == 'o')
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) {
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// FIXME: can we live with int-sized limits?
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// can we live with 40000 days?
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// if yes -> getopt converts strings to numbers for us
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opt_complementary = "-1:a+:c+:d+:f+:l+:m+:o+:p+:r+:s+:t+";
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opt = getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:u:U:e:"
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USE_CHPST("/:n:vP012"),
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&limita, &limitc, &limitd, &limitf, &limitl,
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&limitm, &limito, &limitp, &limitr, &limits, &limitt,
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&set_user, &env_user, &env_dir
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USE_CHPST(, &root, &nicestr));
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argv += optind;
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if (opt & OPT_m) { // -m means -asld
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limita = limits = limitl = limitd = limitm;
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opt |= (OPT_s | OPT_l | OPT_a | OPT_d);
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}
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} else {
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option_mask32 = opt = 0;
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argv++;
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if (!*argv)
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bb_show_usage();
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}
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// envdir?
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if (ENABLE_ENVDIR && applet_name[3] == 'd') {
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env_dir = *argv++;
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opt |= OPT_e;
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}
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// setuidgid?
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if (ENABLE_SETUIDGID && applet_name[1] == 'e') {
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set_user = *argv++;
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opt |= OPT_u;
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}
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// envuidgid?
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if (ENABLE_ENVUIDGID && applet_name[0] == 'e' && applet_name[3] == 'u') {
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env_user = *argv++;
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opt |= OPT_U;
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}
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// we must have PROG [ARGS]
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if (!*argv)
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bb_show_usage();
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// set limits
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if (opt & OPT_d) {
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#ifdef RLIMIT_DATA
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limit(RLIMIT_DATA, limitd);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"DATA");
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#endif
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}
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if (opt & OPT_s) {
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#ifdef RLIMIT_STACK
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limit(RLIMIT_STACK, limits);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"STACK");
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#endif
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}
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if (opt & OPT_l) {
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#ifdef RLIMIT_MEMLOCK
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limit(RLIMIT_MEMLOCK, limitl);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"MEMLOCK");
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#endif
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}
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if (opt & OPT_a) {
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#ifdef RLIMIT_VMEM
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limit(RLIMIT_VMEM, limita);
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#else
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#ifdef RLIMIT_AS
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limit(RLIMIT_AS, limita);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"VMEM");
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#endif
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#endif
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}
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if (opt & OPT_o) {
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#ifdef RLIMIT_NOFILE
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limit(RLIMIT_NOFILE, limito);
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#else
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#ifdef RLIMIT_OFILE
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limit(RLIMIT_OFILE, limito);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"NOFILE");
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#endif
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#endif
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}
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if (opt & OPT_p) {
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#ifdef RLIMIT_NPROC
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limit(RLIMIT_NPROC, limitp);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"NPROC");
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#endif
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}
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if (opt & OPT_f) {
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#ifdef RLIMIT_FSIZE
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limit(RLIMIT_FSIZE, limitf);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"FSIZE");
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#endif
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}
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if (opt & OPT_c) {
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#ifdef RLIMIT_CORE
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limit(RLIMIT_CORE, limitc);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"CORE");
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#endif
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}
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if (opt & OPT_r) {
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#ifdef RLIMIT_RSS
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limit(RLIMIT_RSS, limitr);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"RSS");
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#endif
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}
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if (opt & OPT_t) {
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#ifdef RLIMIT_CPU
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limit(RLIMIT_CPU, limitt);
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#else
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if (opt & OPT_v)
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bb_error_msg("system does not support RLIMIT_%s",
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"CPU");
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#endif
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}
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if (opt & OPT_P)
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setsid();
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if (opt & OPT_e)
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edir(env_dir);
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// FIXME: chrooted jail must have /etc/passwd if we move this after chroot!
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// OTOH chroot fails for non-roots!
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// SOLUTION: cache uid/gid before chroot, apply uid/gid after
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if (opt & OPT_U) {
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xget_uidgid(&ugid, env_user);
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xsetenv("GID", utoa(ugid.gid));
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xsetenv("UID", utoa(ugid.uid));
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}
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if (opt & OPT_u) {
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xget_uidgid(&ugid, set_user);
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}
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if (opt & OPT_root) {
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xchdir(root);
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xchroot(".");
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}
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if (opt & OPT_u) {
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if (setgroups(1, &ugid.gid) == -1)
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bb_perror_msg_and_die("setgroups");
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xsetgid(ugid.gid);
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xsetuid(ugid.uid);
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}
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if (opt & OPT_n) {
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errno = 0;
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if (nice(xatoi(nicestr)) == -1)
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bb_perror_msg_and_die("nice");
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}
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if (opt & OPT_0)
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close(STDIN_FILENO);
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if (opt & OPT_1)
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close(STDOUT_FILENO);
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if (opt & OPT_2)
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close(STDERR_FILENO);
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BB_EXECVP(argv[0], argv);
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bb_perror_msg_and_die("exec %s", argv[0]);
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}
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