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 10 #include <sys/cdefs.h> 11 __FBSDID("$FreeBSD$"); 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], i, iflag, ngroups; 38 char *username; 39 40 iflag = 0; 41 username = NULL; 42 43 while ((ch = getopt(argc, argv, "iu:")) != -1) { 44 switch (ch) { 45 case 'i': 46 iflag = 1; 47 break; 48 case 'u': 49 username = optarg; 50 break; 51 default: 52 usage(); 53 } 54 } 55 argc -= optind; 56 argv += optind; 57 if (argc < 4) 58 usage(); 59 60 if (username != NULL) { 61 pwd = getpwnam(username); 62 if (pwd == NULL) 63 err(1, "getpwnam: %s", username); 64 lcap = login_getpwclass(pwd); 65 if (lcap == NULL) 66 err(1, "getpwclass: %s", username); 67 ngroups = NGROUPS; 68 if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) 69 err(1, "getgrouplist: %s", username); 70 } 71 if (chdir(argv[0]) != 0) 72 err(1, "chdir: %s", argv[0]); 73 memset(&j, 0, sizeof(j)); 74 j.version = 0; 75 j.path = argv[0]; 76 j.hostname = argv[1]; 77 if (inet_aton(argv[2], &in) == 0) 78 errx(1, "Could not make sense of ip-number: %s", argv[2]); 79 j.ip_number = ntohl(in.s_addr); 80 i = jail(&j); 81 if (i == -1) 82 err(1, "jail"); 83 if (iflag) { 84 printf("%d\n", i); 85 fflush(stdout); 86 } 87 if (username != NULL) { 88 if (setgroups(ngroups, groups) != 0) 89 err(1, "setgroups"); 90 if (setgid(pwd->pw_gid) != 0) 91 err(1, "setgid"); 92 if (setusercontext(lcap, pwd, pwd->pw_uid, 93 LOGIN_SETALL & ~LOGIN_SETGROUP) != 0) 94 err(1, "setusercontext"); 95 login_close(lcap); 96 } 97 if (execv(argv[3], argv + 3) != 0) 98 err(1, "execv: %s", argv[3]); 99 exit(0); 100 } 101 102 static void 103 usage(void) 104 { 105 106 (void)fprintf(stderr, 107 "usage: jail [-i] [-u username] path hostname ip-number command ...\n"); 108 exit(1); 109 } 110