1 /* 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD$ 10 * 11 */ 12 13 #include <sys/param.h> 14 #include <sys/jail.h> 15 16 #include <netinet/in.h> 17 #include <arpa/inet.h> 18 19 #include <err.h> 20 #include <grp.h> 21 #include <login_cap.h> 22 #include <pwd.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 static void usage(void); 29 30 int 31 main(int argc, char **argv) 32 { 33 login_cap_t *lcap; 34 struct jail j; 35 struct passwd *pwd; 36 struct in_addr in; 37 int ch, groups[NGROUPS], ngroups; 38 char *username; 39 40 username = NULL; 41 42 while ((ch = getopt(argc, argv, "u:")) != -1) 43 switch (ch) { 44 case 'u': 45 username = optarg; 46 break; 47 default: 48 usage(); 49 break; 50 } 51 argc -= optind; 52 argv += optind; 53 if (argc < 4) 54 usage(); 55 56 if (username != NULL) { 57 pwd = getpwnam(username); 58 if (pwd == NULL) 59 err(1, "getpwnam: %s", username); 60 lcap = login_getpwclass(pwd); 61 if (lcap == NULL) 62 err(1, "getpwclass: %s", username); 63 ngroups = NGROUPS; 64 if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) 65 err(1, "getgrouplist: %s", username); 66 } 67 if (chdir(argv[0]) != 0) 68 err(1, "chdir: %s", argv[0]); 69 memset(&j, 0, sizeof(j)); 70 j.version = 0; 71 j.path = argv[0]; 72 j.hostname = argv[1]; 73 if (inet_aton(argv[2], &in) == 0) 74 errx(1, "Could not make sense of ip-number: %s", argv[2]); 75 j.ip_number = ntohl(in.s_addr); 76 if (jail(&j) != 0) 77 err(1, "jail"); 78 if (username != NULL) { 79 if (setgroups(ngroups, groups) != 0) 80 err(1, "setgroups"); 81 if (setgid(pwd->pw_gid) != 0) 82 err(1, "setgid"); 83 if (setusercontext(lcap, pwd, pwd->pw_uid, 84 LOGIN_SETALL & ~LOGIN_SETGROUP) != 0) 85 err(1, "setusercontext"); 86 } 87 if (execv(argv[3], argv + 3) != 0) 88 err(1, "execv: %s", argv[3]); 89 exit (0); 90 } 91 92 static void 93 usage(void) 94 { 95 96 (void)fprintf(stderr, "%s\n", 97 "Usage: jail [-u username] path hostname ip-number command ..."); 98 exit(1); 99 } 100