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https://github.com/sheumann/hush.git
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runit/chpst: "change process state" utility
It's "nice" on steroids - can set uid/gid, mem/cpu limits etc. +3.5k
This commit is contained in:
Denis Vlasenko
parent
7c1ed2e922
commit
fe54458e46
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@ -470,3 +470,4 @@ source networking/Config.in
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source procps/Config.in
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source shell/Config.in
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source sysklogd/Config.in
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source runit/Config.in
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3
Makefile
3
Makefile
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@ -34,7 +34,8 @@ vpath %/Config.in $(srctree)
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DIRS:=applets archival archival/libunarchive coreutils console-tools \
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debianutils editors findutils init miscutils modutils networking \
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networking/libiproute networking/udhcp procps loginutils shell \
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sysklogd util-linux e2fsprogs libpwdgrp coreutils/libcoreutils libbb
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sysklogd util-linux e2fsprogs libpwdgrp coreutils/libcoreutils \
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runit libbb
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SRC_DIRS:=$(patsubst %,$(top_srcdir)/%,$(DIRS))
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@ -63,10 +63,10 @@ int env_main(int argc, char** argv)
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++argv;
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}
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if(opt & 1)
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if (opt & 1)
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environ = cleanenv;
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else if(opt & 2) {
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while(unset_env) {
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else if (opt & 2) {
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while (unset_env) {
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unsetenv(unset_env->data);
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unset_env = unset_env->link;
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}
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@ -70,6 +70,7 @@ USE_CHATTR(APPLET(chattr, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_CHGRP(APPLET(chgrp, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_CHMOD(APPLET(chmod, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_CHOWN(APPLET(chown, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_CHROOT(APPLET(chroot, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
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USE_CHVT(APPLET(chvt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_CKSUM(APPLET(cksum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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@ -106,6 +107,8 @@ USE_ED(APPLET(ed, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_FEATURE_GREP_EGREP_ALIAS(APPLET_NOUSAGE(egrep, grep, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_EJECT(APPLET(eject, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_ENV(APPLET(env, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_ENVDIR(APPLET_ODDNAME(envdir, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, envdir))
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USE_ENVUIDGID(APPLET_ODDNAME(envuidgid, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, envuidgid))
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USE_ETHER_WAKE(APPLET_ODDNAME(ether-wake, ether_wake, _BB_DIR_USR_BIN, _BB_SUID_NEVER, ether_wake))
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USE_EXPR(APPLET(expr, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_FAKEIDENTD(APPLET(fakeidentd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
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@ -244,12 +247,14 @@ USE_SETCONSOLE(APPLET(setconsole, _BB_DIR_SBIN, _BB_SUID_NEVER))
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USE_SETKEYCODES(APPLET(setkeycodes, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_SETLOGCONS(APPLET(setlogcons, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
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USE_SETSID(APPLET(setsid, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_SETUIDGID(APPLET_ODDNAME(setuidgid, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, setuidgid))
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USE_FEATURE_SH_IS_ASH(APPLET_NOUSAGE(sh, ash, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_FEATURE_SH_IS_LASH(APPLET_NOUSAGE(sh, lash, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_FEATURE_SH_IS_MSH(APPLET_NOUSAGE(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
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USE_SLEEP(APPLET(sleep, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_SOFTLIMIT(APPLET_ODDNAME(softlimit, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, softlimit))
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USE_SORT(APPLET(sort, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, _BB_DIR_SBIN, _BB_SUID_NEVER, start_stop_daemon))
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USE_STAT(APPLET(stat, _BB_DIR_BIN, _BB_SUID_NEVER))
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@ -488,12 +488,13 @@ extern void renew_current_security_context(void);
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extern void set_current_security_context(security_context_t sid);
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#endif
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extern int run_parts(char **args, const unsigned char test_mode, char **env);
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extern int restricted_shell ( const char *shell );
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extern void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw );
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extern int correct_password ( const struct passwd *pw );
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extern int restricted_shell(const char *shell);
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extern void setup_environment(const char *shell, int loginshell, int changeenv, const struct passwd *pw);
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extern int correct_password(const struct passwd *pw);
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extern char *pw_encrypt(const char *clear, const char *salt);
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extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);
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extern void xsetenv(const char *key, const char *value);
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extern int xopen(const char *pathname, int flags);
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extern int xopen3(const char *pathname, int flags, int mode);
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extern void xread(int fd, void *buf, size_t count);
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@ -215,6 +215,70 @@
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"ls -l /tmp/foo\n" \
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"-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
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#define chpst_trivial_usage \
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"[-vP012] [-u user[:group]] [-U user[:group]] [-e dir] " \
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"[-/ dir] [-n nice] [-m bytes] [-d bytes] [-o files] " \
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"[-p processes] [-f bytes] [-c bytes] prog args"
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#define chpst_full_usage \
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"Change the process state and run specified program.\n\n" \
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"-u user[:grp] set uid and gid\n" \
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"-U user[:grp] set environment variables UID and GID\n" \
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"-e dir set environment variables as specified by files\n" \
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" in the directory: file=1st_line_of_file\n" \
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"-/ dir chroot to dir\n" \
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"-n inc add inc to nice value\n" \
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"-m bytes limit data segment, stack segment, locked physical pages,\n" \
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" and total of all segment per process to bytes bytes each\n" \
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"-d bytes limit data segment\n" \
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"-o n limit the number of open file descriptors per process to n\n" \
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"-p n limit number of processes per uid to n\n" \
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"-f bytes limit output file size to bytes bytes\n" \
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"-c bytes limit core file size to bytes bytes\n" \
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"-v verbose\n" \
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"-P run prog in a new process group\n" \
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"-0 close standard input\n" \
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"-1 close standard output\n" \
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"-2 close standard error"
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#define setuidgid_trivial_usage \
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"account prog args"
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#define setuidgid_full_usage \
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"Sets uid and gid to account's uid and gid, removing all supplementary\n" \
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"groups, then runs prog"
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#define envuidgid_trivial_usage \
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"account prog args"
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#define envuidgid_full_usage \
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"Sets $UID to account's uid and $GID to account's gid, then runs prog"
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#define envdir_trivial_usage \
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"dir prog args"
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#define envdir_full_usage \
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"Sets various environment variables as specified by files\n" \
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"in the directory dir, then runs prog"
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#define softlimit_trivial_usage \
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"[-a allbytes] [-c corebytes] [-d databytes] [-f filebytes] " \
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"[-l lockbytes] [-m membytes] [-o openfiles] [-p processes] " \
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"[-r residentbytes] [-s stackbytes] [-t cpusecs] prog args"
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#define softlimit_full_usage \
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"Sets soft resource limits as specified by options, then runs prog\n" \
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"\n" \
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"-m n Same as -d n -s n -l n -a n\n" \
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"-d n Limit the data segment per process to n bytes\n" \
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"-s n Limit the stack segment per process to n bytes\n" \
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"-l n Limit the locked physical pages per process to n bytes\n" \
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"-a n Limit the total of all segments per process to n bytes\n" \
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"-o n Limit the number of open file descriptors per process to n\n" \
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"-p n Limit the number of processes per uid to n\n" \
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"Options controlling file sizes:\n" \
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"-f n Limit output file sizes to n bytes\n" \
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"-c n Limit core file sizes to n bytes\n" \
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"Efficiency opts:\n" \
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"-r n Limit the resident set size to n bytes. This limit is not\n" \
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" enforced unless physical memory is full\n" \
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"-t n Limit the CPU time to n seconds. This limit is not enforced\n" \
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" except that the process receives a SIGXCPU signal after n seconds\n" \
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"\n" \
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"Some options may have no effect on some operating systems\n" \
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"n may be =, indicating that soft limit should be set equal to hard limit"
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#define chroot_trivial_usage \
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"NEWROOT [COMMAND...]"
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#define chroot_full_usage \
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@ -42,15 +42,9 @@
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#define DEFAULT_LOGIN_PATH "/bin:/usr/bin"
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#define DEFAULT_ROOT_LOGIN_PATH "/usr/sbin:/bin:/usr/bin:/sbin"
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static void xsetenv ( const char *key, const char *value )
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void setup_environment(const char *shell, int loginshell, int changeenv, const struct passwd *pw)
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{
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if ( setenv ( key, value, 1 ))
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bb_error_msg_and_die (bb_msg_memory_exhausted);
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}
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void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw )
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{
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if ( loginshell ) {
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if (loginshell) {
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const char *term;
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/* Change the current working directory to be the home directory
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@ -59,32 +53,31 @@ void setup_environment ( const char *shell, int loginshell, int changeenv, const
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* directory.
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* Some systems default to HOME=/
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*/
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if ( chdir ( pw-> pw_dir )) {
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xchdir ( "/" );
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fputs ( "warning: cannot change to home directory\n", stderr );
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if (chdir(pw->pw_dir)) {
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xchdir("/");
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fputs("warning: cannot change to home directory\n", stderr);
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}
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/* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
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Unset all other environment variables. */
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term = getenv ("TERM");
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clearenv ( );
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if ( term )
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xsetenv ( "TERM", term );
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xsetenv ( "HOME", pw-> pw_dir );
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xsetenv ( "SHELL", shell );
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xsetenv ( "USER", pw-> pw_name );
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xsetenv ( "LOGNAME", pw-> pw_name );
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xsetenv ( "PATH", ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ));
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term = getenv("TERM");
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clearenv();
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if (term)
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xsetenv("TERM", term);
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xsetenv("HOME", pw->pw_dir);
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xsetenv("SHELL", shell);
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xsetenv("USER", pw->pw_name);
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xsetenv("LOGNAME", pw->pw_name);
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xsetenv("PATH", (pw->pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH));
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}
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else if ( changeenv ) {
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else if (changeenv) {
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/* Set HOME, SHELL, and if not becoming a super-user,
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USER and LOGNAME. */
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xsetenv ( "HOME", pw-> pw_dir );
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xsetenv ( "SHELL", shell );
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if ( pw-> pw_uid ) {
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xsetenv ( "USER", pw-> pw_name );
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xsetenv ( "LOGNAME", pw-> pw_name );
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xsetenv("HOME", pw->pw_dir);
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xsetenv("SHELL", shell);
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if (pw->pw_uid) {
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xsetenv("USER", pw->pw_name);
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xsetenv("LOGNAME", pw->pw_name);
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}
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}
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}
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@ -255,6 +255,14 @@ int wait4pid(int pid)
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}
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#endif
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#ifdef L_xsetenv
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void xsetenv(const char *key, const char *value)
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{
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if(setenv(key, value, 1))
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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}
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#endif
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#ifdef L_itoa
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// Convert unsigned integer to ascii, writing into supplied buffer. A
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// truncated result is always null terminated (unless buflen is 0), and
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