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/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 43 jail(p, uap) 44 struct proc *p; 45 struct jail_args /* { 46 syscallarg(struct jail *) jail; 47 } */ *uap; 48 { 49 int error; 50 struct prison *pr; 51 struct jail j; 52 struct chroot_args ca; 53 54 error = suser(p); 55 if (error) 56 return (error); 57 error = copyin(uap->jail, &j, sizeof j); 58 if (error) 59 return (error); 60 if (j.version != 0) 61 return (EINVAL); 62 MALLOC(pr, struct prison *, sizeof *pr , M_PRISON, M_WAITOK); 63 bzero((caddr_t)pr, sizeof *pr); 64 error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0); 65 if (error) 66 goto bail; 67 pr->pr_ip = j.ip_number; 68 69 ca.path = j.path; 70 error = chroot(p, &ca); 71 if (error) 72 goto bail; 73 74 pr->pr_ref++; 75 p->p_prison = pr; 76 p->p_flag |= P_JAILED; 77 return (0); 78 79 bail: 80 FREE(pr, M_PRISON); 81 return (error); 82 } 83 84 int 85 prison_ip(struct proc *p, int flag, u_int32_t *ip) 86 { 87 u_int32_t tmp; 88 89 if (!p->p_prison) 90 return (0); 91 if (flag) 92 tmp = *ip; 93 else 94 tmp = ntohl(*ip); 95 if (tmp == INADDR_ANY) { 96 if (flag) 97 *ip = p->p_prison->pr_ip; 98 else 99 *ip = htonl(p->p_prison->pr_ip); 100 return (0); 101 } 102 if (p->p_prison->pr_ip != tmp) 103 return (1); 104 return (0); 105 } 106 107 void 108 prison_remote_ip(struct proc *p, int flag, u_int32_t *ip) 109 { 110 u_int32_t tmp; 111 112 if (!p || !p->p_prison) 113 return; 114 if (flag) 115 tmp = *ip; 116 else 117 tmp = ntohl(*ip); 118 if (tmp == 0x7f000001) { 119 if (flag) 120 *ip = p->p_prison->pr_ip; 121 else 122 *ip = htonl(p->p_prison->pr_ip); 123 return; 124 } 125 return; 126 } 127 128 int 129 prison_if(struct proc *p, struct sockaddr *sa) 130 { 131 struct sockaddr_in *sai = (struct sockaddr_in*) sa; 132 int ok; 133 134 if ((sai->sin_family != AF_INET) && jail_socket_unixiproute_only) 135 ok = 1; 136 else if (sai->sin_family != AF_INET) 137 ok = 0; 138 else if (p->p_prison->pr_ip != ntohl(sai->sin_addr.s_addr)) 139 ok = 1; 140 else 141 ok = 0; 142 return (ok); 143 } 144