mirror of
https://github.com/sheumann/hush.git
synced 2024-11-09 02:09:01 +00:00
332 lines
8.3 KiB
C
332 lines
8.3 KiB
C
#include "busybox.h"
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#include <dirent.h>
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// Must match constants in chpst_main!
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#define OPT_verbose (option_mask32 & 0x2000)
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#define OPT_pgrp (option_mask32 & 0x4000)
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#define OPT_nostdin (option_mask32 & 0x8000)
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#define OPT_nostdout (option_mask32 & 0x10000)
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#define OPT_nostderr (option_mask32 & 0x20000)
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static char *set_user;
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static char *env_user;
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static const char *env_dir;
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static long limitd = -2;
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static long limits = -2;
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static long limitl = -2;
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static long limita = -2;
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static long limito = -2;
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static long limitp = -2;
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static long limitf = -2;
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static long limitc = -2;
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static long limitr = -2;
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static long limitt = -2;
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static int nicelvl;
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static const char *root;
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static void suidgid(char *user)
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{
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struct bb_uidgid_t ugid;
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if (!uidgid_get(&ugid, user)) {
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bb_error_msg_and_die("unknown user/group: %s", user);
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}
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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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static void euidgid(char *user)
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{
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struct bb_uidgid_t ugid;
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if (!uidgid_get(&ugid, user)) {
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bb_error_msg_and_die("unknown user/group: %s", user);
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}
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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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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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errno = 0;
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d = readdir(dir);
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if (!d) {
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if (errno) bb_perror_msg_and_die("readdir %s", directory_name);
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break;
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}
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if (d->d_name[0] == '.') 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) && env_dir) {
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if (OPT_verbose)
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bb_perror_msg("warning: %s/%s is a directory", directory_name,
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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", directory_name, /* was exiting 111 */
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d->d_name);
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}
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if (fd >= 0) {
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char buf[256];
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char *tail;
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int size;
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size = safe_read(fd, buf, sizeof(buf)-1);
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if (size < 0)
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bb_perror_msg_and_die("read %s/%s", directory_name, /* was exiting 111 */
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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 = memchr(buf, '\n', sizeof(buf));
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/* skip trailing whitespace */;
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while (1) {
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if (tail[0]==' ') tail[0] = '\0';
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if (tail[0]=='\t') tail[0] = '\0';
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if (tail[0]=='\n') tail[0] = '\0';
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if (tail == buf) break;
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tail--;
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}
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xsetenv(d->d_name, buf);
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}
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}
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closedir(dir);
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if (fchdir(wdir) == -1) 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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if (getrlimit(what, &r) == -1) bb_perror_msg_and_die("getrlimit");
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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) bb_perror_msg_and_die("setrlimit");
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}
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static void slimit(void)
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{
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if (limitd >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_DATA");
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#endif
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}
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if (limits >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_STACK");
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#endif
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}
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if (limitl >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_MEMLOCK");
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#endif
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}
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if (limita >= -1) {
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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_verbose)
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bb_error_msg("system does not support %s", "RLIMIT_VMEM");
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#endif
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#endif
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}
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if (limito >= -1) {
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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_verbose)
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bb_error_msg("system does not support %s", "RLIMIT_NOFILE");
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#endif
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#endif
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}
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if (limitp >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_NPROC");
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#endif
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}
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if (limitf >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_FSIZE");
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#endif
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}
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if (limitc >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_CORE");
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#endif
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}
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if (limitr >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_RSS");
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#endif
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}
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if (limitt >= -1) {
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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_verbose) bb_error_msg("system does not support %s", "RLIMIT_CPU");
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#endif
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}
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}
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/* argv[0] */
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static void setuidgid(int, char **);
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static void envuidgid(int, char **);
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static void envdir(int, char **);
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static void softlimit(int, char **);
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int chpst_main(int argc, char **argv)
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{
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if (applet_name[3] == 'd') envdir(argc, argv);
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if (applet_name[1] == 'o') softlimit(argc, argv);
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if (applet_name[0] == 's') setuidgid(argc, argv);
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if (applet_name[0] == 'e') envuidgid(argc, argv);
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// otherwise we are.......... chpst
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{
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char *m,*d,*o,*p,*f,*c,*r,*t,*n;
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getopt32(argc, argv, "+u:U:e:m:d:o:p:f:c:r:t:/:n:vP012",
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&set_user,&env_user,&env_dir,
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&m,&d,&o,&p,&f,&c,&r,&t,&root,&n);
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// if (option_mask32 & 0x1) // -u
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// if (option_mask32 & 0x2) // -U
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// if (option_mask32 & 0x4) // -e
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if (option_mask32 & 0x8) limits = limitl = limita = limitd = xatoul(m); // -m
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if (option_mask32 & 0x10) limitd = xatoul(d); // -d
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if (option_mask32 & 0x20) limito = xatoul(o); // -o
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if (option_mask32 & 0x40) limitp = xatoul(p); // -p
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if (option_mask32 & 0x80) limitf = xatoul(f); // -f
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if (option_mask32 & 0x100) limitc = xatoul(c); // -c
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if (option_mask32 & 0x200) limitr = xatoul(r); // -r
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if (option_mask32 & 0x400) limitt = xatoul(t); // -t
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// if (option_mask32 & 0x800) // -/
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if (option_mask32 & 0x1000) nicelvl = xatoi(n); // -n
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// The below consts should match #defines at top!
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//if (option_mask32 & 0x2000) OPT_verbose = 1; // -v
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//if (option_mask32 & 0x4000) OPT_pgrp = 1; // -P
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//if (option_mask32 & 0x8000) OPT_nostdin = 1; // -0
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//if (option_mask32 & 0x10000) OPT_nostdout = 1; // -1
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//if (option_mask32 & 0x20000) OPT_nostderr = 1; // -2
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}
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argv += optind;
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if (!argv || !*argv) bb_show_usage();
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if (OPT_pgrp) setsid();
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if (env_dir) edir(env_dir);
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if (root) {
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xchdir(root);
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if (chroot(".") == -1)
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bb_perror_msg_and_die("chroot");
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}
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slimit();
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if (nicelvl) {
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errno = 0;
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if (nice(nicelvl) == -1)
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bb_perror_msg_and_die("nice");
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}
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if (env_user) euidgid(env_user);
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if (set_user) suidgid(set_user);
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if (OPT_nostdin) close(0);
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if (OPT_nostdout) close(1);
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if (OPT_nostderr) close(2);
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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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static void setuidgid(int argc, char **argv)
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{
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const char *account;
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account = *++argv;
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if (!account) bb_show_usage();
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if (!*++argv) bb_show_usage();
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suidgid((char*)account);
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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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static void envuidgid(int argc, char **argv)
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{
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const char *account;
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account = *++argv;
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if (!account) bb_show_usage();
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if (!*++argv) bb_show_usage();
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euidgid((char*)account);
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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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static void envdir(int argc, char **argv)
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{
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const char *dir;
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dir = *++argv;
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if (!dir) bb_show_usage();
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if (!*++argv) bb_show_usage();
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edir(dir);
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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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static void softlimit(int argc, char **argv)
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{
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char *a,*c,*d,*f,*l,*m,*o,*p,*r,*s,*t;
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getopt32(argc, argv, "+a:c:d:f:l:m:o:p:r:s:t:",
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&a,&c,&d,&f,&l,&m,&o,&p,&r,&s,&t);
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if (option_mask32 & 0x001) limita = xatoul(a); // -a
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if (option_mask32 & 0x002) limitc = xatoul(c); // -c
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if (option_mask32 & 0x004) limitd = xatoul(d); // -d
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if (option_mask32 & 0x008) limitf = xatoul(f); // -f
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if (option_mask32 & 0x010) limitl = xatoul(l); // -l
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if (option_mask32 & 0x020) limits = limitl = limita = limitd = xatoul(m); // -m
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if (option_mask32 & 0x040) limito = xatoul(o); // -o
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if (option_mask32 & 0x080) limitp = xatoul(p); // -p
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if (option_mask32 & 0x100) limitr = xatoul(r); // -r
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if (option_mask32 & 0x200) limits = xatoul(s); // -s
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if (option_mask32 & 0x400) limitt = xatoul(t); // -t
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argv += optind;
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if (!argv[0]) bb_show_usage();
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slimit();
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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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