Yeah, yeah... I forgot about 'svn add'... fixing that

1 files changed, 345 insertions, 0 deletions

diff --git a/runit/chpst.c b/runit/chpst.c
new file mode 100644
index 0000000..11ee3d7
--- /dev/null
+++ b/runit/chpst.c
@@ -0,0 +1,345 @@
+#include "busybox.h"
+
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <grp.h>
+
+#include "uidgid.h"
+
+#include <sys/types.h>
+#include <dirent.h>
+
+static unsigned option_mask;
+// Must meatch constants in chpst_main!
+#define OPT_verbose  (option_mask & 0x2000)
+#define OPT_pgrp     (option_mask & 0x4000)
+#define OPT_nostdin  (option_mask & 0x8000)
+#define OPT_nostdout (option_mask & 0x10000)
+#define OPT_nostderr (option_mask & 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 long nicelvl;
+static const char *root;
+
+static void suidgid(char *user, unsigned dogrp)
+{
+	struct uidgid ugid;
+
+	if (!uidgid_get(&ugid, user, dogrp)) {
+		if (dogrp)
+			bb_error_msg_and_die("unknown user/group: %s", user);
+		else
+			bb_error_msg_and_die("unknown account: %s", user);
+	}
+	if (setgroups(ugid.gids, ugid.gid) == -1)
+		bb_perror_msg_and_die("setgroups");
+	xsetgid(*ugid.gid);
+	xsetuid(ugid.uid);
+}
+
+static void euidgid(char *user, unsigned dogrp)
+{
+	struct uidgid ugid;
+
+	if (!uidgid_get(&ugid, user, dogrp)) {
+		if (dogrp)
+			bb_error_msg_and_die("unknown user/group: %s", user);
+		else
+			bb_error_msg_and_die("unknown account: %s", user);
+	}
+	//FIXME: ultoa needed here!
+	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, /* was exiting 111 */
+				                     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, /* was exiting 111 */
+						d->d_name);
+			if (size == 0) {
+				xsetenv(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 (bb_applet_name[3] == 'd') envdir(argc, argv);
+	if (bb_applet_name[1] == 'o') softlimit(argc, argv);
+	if (bb_applet_name[0] == 's') setuidgid(argc, argv);
+	if (bb_applet_name[0] == 'e') envuidgid(argc, argv);
+        // otherwise we are.......... chpst
+
+	{
+		char *m,*d,*o,*p,*f,*c,*r,*t,*n;
+		option_mask = bb_getopt_ulflags(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_mask & 0x1) // -u
+		// if (option_mask & 0x2) // -U
+		// if (option_mask & 0x4) // -e
+		if (option_mask & 0x8) limits = limitl = limita = limitd = bb_xgetularg10(m); // -m
+		if (option_mask & 0x10) limitd = bb_xgetularg10(d); // -d
+		if (option_mask & 0x20) limito = bb_xgetularg10(o); // -o
+		if (option_mask & 0x40) limitp = bb_xgetularg10(p); // -p
+		if (option_mask & 0x80) limitf = bb_xgetularg10(f); // -f
+		if (option_mask & 0x100) limitc = bb_xgetularg10(c); // -c
+		if (option_mask & 0x200) limitr = bb_xgetularg10(r); // -r
+		if (option_mask & 0x400) limitt = bb_xgetularg10(t); // -t
+		// if (option_mask & 0x800) // -/
+		if (option_mask & 0x1000) nicelvl = bb_xgetlarg_bnd_sfx(n, 10, -20, 20, NULL); // -n
+		// The below consts should match #defines at top!
+		//if (option_mask & 0x2000) OPT_verbose = 1; // -v
+		//if (option_mask & 0x4000) OPT_pgrp = 1; // -P
+		//if (option_mask & 0x8000) OPT_nostdin = 1; // -0
+		//if (option_mask & 0x10000) OPT_nostdout = 1; // -1
+		//if (option_mask & 0x20000) OPT_nostderr = 1; // -2
+	}
+	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, 1);
+	if (set_user) suidgid(set_user, 1);
+	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, 0);
+	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, 0);
+	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;
+	option_mask = bb_getopt_ulflags(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_mask & 0x001) limita = bb_xgetularg10(a); // -a
+	if (option_mask & 0x002) limitc = bb_xgetularg10(c); // -c
+	if (option_mask & 0x004) limitd = bb_xgetularg10(d); // -d
+	if (option_mask & 0x008) limitf = bb_xgetularg10(f); // -f
+	if (option_mask & 0x010) limitl = bb_xgetularg10(l); // -l
+	if (option_mask & 0x020) limits = limitl = limita = limitd = bb_xgetularg10(m); // -m
+	if (option_mask & 0x040) limito = bb_xgetularg10(o); // -o
+	if (option_mask & 0x080) limitp = bb_xgetularg10(p); // -p
+	if (option_mask & 0x100) limitr = bb_xgetularg10(r); // -r
+	if (option_mask & 0x200) limits = bb_xgetularg10(s); // -s
+	if (option_mask & 0x400) limitt = bb_xgetularg10(t); // -t
+	argv += optind;
+	if (!argv[0]) bb_show_usage();
+	slimit();
+	execvp(argv[0], argv);
+	bb_perror_msg_and_die("exec %s", argv[0]);
+}