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