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: src/sys/kern/kern_jail.c,v 1.6.2.3 2001/08/17 01:00:26 rwatson Exp $ 10 * 11 */ 12 13 #include <sys/param.h> 14 #include <sys/types.h> 15 #include <sys/kernel.h> 16 #include <sys/systm.h> 17 #include <sys/errno.h> 18 #include <sys/sysproto.h> 19 #include <sys/malloc.h> 20 #include <sys/proc.h> 21 #include <sys/jail.h> 22 #include <sys/socket.h> 23 #include <sys/sysctl.h> 24 #include <net/if.h> 25 #include <netinet/in.h> 26 27 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 28 29 SYSCTL_NODE(, OID_AUTO, jail, CTLFLAG_RW, 0, 30 "Jail rules"); 31 32 int jail_set_hostname_allowed = 1; 33 SYSCTL_INT(_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW, 34 &jail_set_hostname_allowed, 0, 35 "Processes in jail can set their hostnames"); 36 37 int jail_socket_unixiproute_only = 1; 38 SYSCTL_INT(_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW, 39 &jail_socket_unixiproute_only, 0, 40 "Processes in jail are limited to creating UNIX/IPv4/route sockets only"); 41 42 int jail_sysvipc_allowed = 0; 43 SYSCTL_INT(_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW, 44 &jail_sysvipc_allowed, 0, 45 "Processes in jail can use System V IPC primitives"); 46 47 int 48 jail(p, uap) 49 struct proc *p; 50 struct jail_args /* { 51 syscallarg(struct jail *) jail; 52 } */ *uap; 53 { 54 int error; 55 struct prison *pr; 56 struct jail j; 57 struct chroot_args ca; 58 59 error = suser(p); 60 if (error) 61 return (error); 62 error = copyin(uap->jail, &j, sizeof j); 63 if (error) 64 return (error); 65 if (j.version != 0) 66 return (EINVAL); 67 MALLOC(pr, struct prison *, sizeof *pr , M_PRISON, M_WAITOK); 68 bzero((caddr_t)pr, sizeof *pr); 69 error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0); 70 if (error) 71 goto bail; 72 pr->pr_ip = j.ip_number; 73 74 ca.path = j.path; 75 error = chroot(p, &ca); 76 if (error) 77 goto bail; 78 79 pr->pr_ref++; 80 p->p_prison = pr; 81 p->p_flag |= P_JAILED; 82 return (0); 83 84 bail: 85 FREE(pr, M_PRISON); 86 return (error); 87 } 88 89 int 90 prison_ip(struct proc *p, int flag, u_int32_t *ip) 91 { 92 u_int32_t tmp; 93 94 if (!p->p_prison) 95 return (0); 96 if (flag) 97 tmp = *ip; 98 else 99 tmp = ntohl(*ip); 100 if (tmp == INADDR_ANY) { 101 if (flag) 102 *ip = p->p_prison->pr_ip; 103 else 104 *ip = htonl(p->p_prison->pr_ip); 105 return (0); 106 } 107 if (tmp == INADDR_LOOPBACK) { 108 if (flag) 109 *ip = p->p_prison->pr_ip; 110 else 111 *ip = htonl(p->p_prison->pr_ip); 112 return (0); 113 } 114 if (p->p_prison->pr_ip != tmp) 115 return (1); 116 return (0); 117 } 118 119 void 120 prison_remote_ip(struct proc *p, int flag, u_int32_t *ip) 121 { 122 u_int32_t tmp; 123 124 if (!p || !p->p_prison) 125 return; 126 if (flag) 127 tmp = *ip; 128 else 129 tmp = ntohl(*ip); 130 if (tmp == INADDR_LOOPBACK) { 131 if (flag) 132 *ip = p->p_prison->pr_ip; 133 else 134 *ip = htonl(p->p_prison->pr_ip); 135 return; 136 } 137 return; 138 } 139 140 int 141 prison_if(struct proc *p, struct sockaddr *sa) 142 { 143 struct sockaddr_in *sai = (struct sockaddr_in*) sa; 144 int ok; 145 146 if ((sai->sin_family != AF_INET) && jail_socket_unixiproute_only) 147 ok = 1; 148 else if (sai->sin_family != AF_INET) 149 ok = 0; 150 else if (p->p_prison->pr_ip != ntohl(sai->sin_addr.s_addr)) 151 ok = 1; 152 else 153 ok = 0; 154 return (ok); 155 } 156