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 38 jail(p, uap) 39 struct proc *p; 40 struct jail_args /* { 41 syscallarg(struct jail *) jail; 42 } */ *uap; 43 { 44 int error; 45 struct prison *pr; 46 struct jail j; 47 struct chroot_args ca; 48 49 error = suser(p); 50 if (error) 51 return (error); 52 error = copyin(uap->jail, &j, sizeof j); 53 if (error) 54 return (error); 55 if (j.version != 0) 56 return (EINVAL); 57 MALLOC(pr, struct prison *, sizeof *pr , M_PRISON, M_WAITOK); 58 bzero((caddr_t)pr, sizeof *pr); 59 error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0); 60 if (error) 61 goto bail; 62 pr->pr_ip = j.ip_number; 63 64 ca.path = j.path; 65 error = chroot(p, &ca); 66 if (error) 67 goto bail; 68 69 pr->pr_ref++; 70 p->p_prison = pr; 71 p->p_flag |= P_JAILED; 72 return (0); 73 74 bail: 75 FREE(pr, M_PRISON); 76 return (error); 77 } 78 79 int 80 prison_ip(struct proc *p, int flag, u_int32_t *ip) 81 { 82 u_int32_t tmp; 83 84 if (!p->p_prison) 85 return (0); 86 if (flag) 87 tmp = *ip; 88 else 89 tmp = ntohl(*ip); 90 if (tmp == INADDR_ANY) { 91 if (flag) 92 *ip = p->p_prison->pr_ip; 93 else 94 *ip = htonl(p->p_prison->pr_ip); 95 return (0); 96 } 97 if (p->p_prison->pr_ip != tmp) 98 return (1); 99 return (0); 100 } 101 102 void 103 prison_remote_ip(struct proc *p, int flag, u_int32_t *ip) 104 { 105 u_int32_t tmp; 106 107 if (!p || !p->p_prison) 108 return; 109 if (flag) 110 tmp = *ip; 111 else 112 tmp = ntohl(*ip); 113 if (tmp == 0x7f000001) { 114 if (flag) 115 *ip = p->p_prison->pr_ip; 116 else 117 *ip = htonl(p->p_prison->pr_ip); 118 return; 119 } 120 return; 121 } 122 123 int 124 prison_if(struct proc *p, struct sockaddr *sa) 125 { 126 struct sockaddr_in *sai = (struct sockaddr_in*) sa; 127 int ok; 128 129 if (sai->sin_family != AF_INET) 130 ok = 0; 131 else if (p->p_prison->pr_ip != ntohl(sai->sin_addr.s_addr)) 132 ok = 1; 133 else 134 ok = 0; 135 return (ok); 136 } 137