/* 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 Denis Vlasenko <vda.linux@googlemail.com> */ /* Dependencies on runit_lib.c removed */ #include "busybox.h" #include <dirent.h> // Must match constants in chpst_main! #define OPT_verbose (option_mask32 & 0x2000) #define OPT_pgrp (option_mask32 & 0x4000) #define OPT_nostdin (option_mask32 & 0x8000) #define OPT_nostdout (option_mask32 & 0x10000) #define OPT_nostderr (option_mask32 & 0x20000) static char *set_user; static char *env_user; static const char *env_dir; static long limitd = -2; static long limits = -2; static long limitl = -2; static long limita = -2; static long limito = -2; static long limitp = -2; static long limitf = -2; static long limitc = -2; static long limitr = -2; static long limitt = -2; static int nicelvl; static const char *root; static void suidgid(char *user) { struct bb_uidgid_t ugid; if (!uidgid_get(&ugid, user)) { bb_error_msg_and_die("unknown user/group: %s", user); } if (setgroups(1, &ugid.gid) == -1) bb_perror_msg_and_die("setgroups"); xsetgid(ugid.gid); xsetuid(ugid.uid); } static void euidgid(char *user) { struct bb_uidgid_t ugid; if (!uidgid_get(&ugid, user)) { bb_error_msg_and_die("unknown user/group: %s", user); } xsetenv("GID", utoa(ugid.gid)); xsetenv("UID", utoa(ugid.uid)); } 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 (;;) { 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) && env_dir) { if (OPT_verbose) 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); } if (fd >= 0) { char buf[256]; char *tail; int size; size = safe_read(fd, buf, sizeof(buf)-1); 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 = memchr(buf, '\n', sizeof(buf)); /* skip trailing whitespace */; while (1) { if (tail[0]==' ') tail[0] = '\0'; if (tail[0]=='\t') tail[0] = '\0'; if (tail[0]=='\n') tail[0] = '\0'; if (tail == buf) break; tail--; } 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; if (getrlimit(what, &r) == -1) bb_perror_msg_and_die("getrlimit"); 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"); } static void slimit(void) { if (limitd >= -1) { #ifdef RLIMIT_DATA limit(RLIMIT_DATA, limitd); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_DATA"); #endif } if (limits >= -1) { #ifdef RLIMIT_STACK limit(RLIMIT_STACK, limits); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_STACK"); #endif } if (limitl >= -1) { #ifdef RLIMIT_MEMLOCK limit(RLIMIT_MEMLOCK, limitl); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_MEMLOCK"); #endif } if (limita >= -1) { #ifdef RLIMIT_VMEM limit(RLIMIT_VMEM, limita); #else #ifdef RLIMIT_AS limit(RLIMIT_AS, limita); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_VMEM"); #endif #endif } if (limito >= -1) { #ifdef RLIMIT_NOFILE limit(RLIMIT_NOFILE, limito); #else #ifdef RLIMIT_OFILE limit(RLIMIT_OFILE, limito); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_NOFILE"); #endif #endif } if (limitp >= -1) { #ifdef RLIMIT_NPROC limit(RLIMIT_NPROC, limitp); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_NPROC"); #endif } if (limitf >= -1) { #ifdef RLIMIT_FSIZE limit(RLIMIT_FSIZE, limitf); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_FSIZE"); #endif } if (limitc >= -1) { #ifdef RLIMIT_CORE limit(RLIMIT_CORE, limitc); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_CORE"); #endif } if (limitr >= -1) { #ifdef RLIMIT_RSS limit(RLIMIT_RSS, limitr); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_RSS"); #endif } if (limitt >= -1) { #ifdef RLIMIT_CPU limit(RLIMIT_CPU, limitt); #else if (OPT_verbose) bb_error_msg("system does not support %s", "RLIMIT_CPU"); #endif } } /* argv[0] */ static void setuidgid(int, char **); static void envuidgid(int, char **); static void envdir(int, char **); static void softlimit(int, char **); int chpst_main(int argc, char **argv) { if (applet_name[3] == 'd') envdir(argc, argv); if (applet_name[1] == 'o') softlimit(argc, argv); if (applet_name[0] == 's') setuidgid(argc, argv); if (applet_name[0] == 'e') envuidgid(argc, argv); // otherwise we are chpst { char *m,*d,*o,*p,*f,*c,*r,*t,*n; getopt32(argc, argv, "+u:U:e:m:d:o:p:f:c:r:t:/:n:vP012", &set_user,&env_user,&env_dir, &m,&d,&o,&p,&f,&c,&r,&t,&root,&n); // if (option_mask32 & 0x1) // -u // if (option_mask32 & 0x2) // -U // if (option_mask32 & 0x4) // -e if (option_mask32 & 0x8) limits = limitl = limita = limitd = xatoul(m); // -m if (option_mask32 & 0x10) limitd = xatoul(d); // -d if (option_mask32 & 0x20) limito = xatoul(o); // -o if (option_mask32 & 0x40) limitp = xatoul(p); // -p if (option_mask32 & 0x80) limitf = xatoul(f); // -f if (option_mask32 & 0x100) limitc = xatoul(c); // -c if (option_mask32 & 0x200) limitr = xatoul(r); // -r if (option_mask32 & 0x400) limitt = xatoul(t); // -t // if (option_mask32 & 0x800) // -/ if (option_mask32 & 0x1000) nicelvl = xatoi(n); // -n // The below consts should match #defines at top! //if (option_mask32 & 0x2000) OPT_verbose = 1; // -v //if (option_mask32 & 0x4000) OPT_pgrp = 1; // -P //if (option_mask32 & 0x8000) OPT_nostdin = 1; // -0 //if (option_mask32 & 0x10000) OPT_nostdout = 1; // -1 //if (option_mask32 & 0x20000) OPT_nostderr = 1; // -2 } argv += optind; if (!argv || !*argv) bb_show_usage(); if (OPT_pgrp) setsid(); if (env_dir) edir(env_dir); if (root) { xchdir(root); if (chroot(".") == -1) bb_perror_msg_and_die("chroot"); } slimit(); if (nicelvl) { errno = 0; if (nice(nicelvl) == -1) bb_perror_msg_and_die("nice"); } if (env_user) euidgid(env_user); if (set_user) suidgid(set_user); if (OPT_nostdin) close(0); if (OPT_nostdout) close(1); if (OPT_nostderr) close(2); execvp(argv[0], argv); bb_perror_msg_and_die("exec %s", argv[0]); } static void setuidgid(int argc, char **argv) { const char *account; account = *++argv; if (!account) bb_show_usage(); if (!*++argv) bb_show_usage(); suidgid((char*)account); execvp(argv[0], argv); bb_perror_msg_and_die("exec %s", argv[0]); } static void envuidgid(int argc, char **argv) { const char *account; account = *++argv; if (!account) bb_show_usage(); if (!*++argv) bb_show_usage(); euidgid((char*)account); execvp(argv[0], argv); bb_perror_msg_and_die("exec %s", argv[0]); } static void envdir(int argc, char **argv) { const char *dir; dir = *++argv; if (!dir) bb_show_usage(); if (!*++argv) bb_show_usage(); edir(dir); execvp(argv[0], argv); bb_perror_msg_and_die("exec %s", argv[0]); } static void softlimit(int argc, char **argv) { char *a,*c,*d,*f,*l,*m,*o,*p,*r,*s,*t; getopt32(argc, argv, "+a:c:d:f:l:m:o:p:r:s:t:", &a,&c,&d,&f,&l,&m,&o,&p,&r,&s,&t); if (option_mask32 & 0x001) limita = xatoul(a); // -a if (option_mask32 & 0x002) limitc = xatoul(c); // -c if (option_mask32 & 0x004) limitd = xatoul(d); // -d if (option_mask32 & 0x008) limitf = xatoul(f); // -f if (option_mask32 & 0x010) limitl = xatoul(l); // -l if (option_mask32 & 0x020) limits = limitl = limita = limitd = xatoul(m); // -m if (option_mask32 & 0x040) limito = xatoul(o); // -o if (option_mask32 & 0x080) limitp = xatoul(p); // -p if (option_mask32 & 0x100) limitr = xatoul(r); // -r if (option_mask32 & 0x200) limits = xatoul(s); // -s if (option_mask32 & 0x400) limitt = xatoul(t); // -t argv += optind; if (!argv[0]) bb_show_usage(); slimit(); execvp(argv[0], argv); bb_perror_msg_and_die("exec %s", argv[0]); }