5b242e8c08
program under specific user's credentials, clean the environment and set only a few variables. PR: bin/70024 Submitted by: demon MFC after: 1 month
155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <login_cap.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void);
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extern char **environ;
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#define GET_USER_INFO do { \
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pwd = getpwnam(username); \
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if (pwd == NULL) { \
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if (errno) \
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err(1, "getpwnam: %s", username); \
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else \
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errx(1, "%s: no such user", username); \
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} \
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lcap = login_getpwclass(pwd); \
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if (lcap == NULL) \
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err(1, "getpwclass: %s", username); \
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ngroups = NGROUPS; \
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if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) \
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err(1, "getgrouplist: %s", username); \
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} while (0)
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int
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main(int argc, char **argv)
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{
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login_cap_t *lcap;
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struct jail j;
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struct passwd *pwd;
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struct in_addr in;
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int ch, groups[NGROUPS], i, iflag, lflag, ngroups, uflag, Uflag;
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char path[PATH_MAX], *username;
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static char *cleanenv;
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const char *shell, *p;
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iflag = lflag = uflag = Uflag = 0;
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username = cleanenv = NULL;
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while ((ch = getopt(argc, argv, "ilu:U:")) != -1) {
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switch (ch) {
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case 'i':
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iflag = 1;
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break;
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case 'u':
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username = optarg;
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uflag = 1;
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break;
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case 'U':
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username = optarg;
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Uflag = 1;
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break;
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case 'l':
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lflag = 1;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 4)
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usage();
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if (uflag && Uflag)
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usage();
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if (lflag && username == NULL)
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usage();
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if (uflag)
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GET_USER_INFO;
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if (realpath(argv[0], path) == NULL)
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err(1, "realpath: %s", argv[0]);
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if (chdir(path) != 0)
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err(1, "chdir: %s", path);
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memset(&j, 0, sizeof(j));
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j.version = 0;
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j.path = path;
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j.hostname = argv[1];
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if (inet_aton(argv[2], &in) == 0)
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errx(1, "Could not make sense of ip-number: %s", argv[2]);
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j.ip_number = ntohl(in.s_addr);
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i = jail(&j);
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if (i == -1)
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err(1, "jail");
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if (iflag) {
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printf("%d\n", i);
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fflush(stdout);
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}
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if (username != NULL) {
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if (Uflag)
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GET_USER_INFO;
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if (lflag) {
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p = getenv("TERM");
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environ = &cleanenv;
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}
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if (setgroups(ngroups, groups) != 0)
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err(1, "setgroups");
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if (setgid(pwd->pw_gid) != 0)
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err(1, "setgid");
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if (setusercontext(lcap, pwd, pwd->pw_uid,
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LOGIN_SETALL & ~LOGIN_SETGROUP) != 0)
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err(1, "setusercontext");
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login_close(lcap);
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}
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if (lflag) {
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if (*pwd->pw_shell)
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shell = pwd->pw_shell;
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else
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shell = _PATH_BSHELL;
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if (chdir(pwd->pw_dir) < 0)
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errx(1, "no home directory");
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setenv("HOME", pwd->pw_dir, 1);
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setenv("SHELL", shell, 1);
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setenv("USER", pwd->pw_name, 1);
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if (p)
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setenv("TERM", p, 1);
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}
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if (execv(argv[3], argv + 3) != 0)
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err(1, "execv: %s", argv[3]);
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "%s%s\n",
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"usage: jail [-i] [-l -u username | -U username]",
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" path hostname ip-number command ...");
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exit(1);
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}
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