1 /*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_ddb.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/types.h> 38 #include <sys/kernel.h> 39 #include <sys/systm.h> 40 #include <sys/errno.h> 41 #include <sys/sysproto.h> 42 #include <sys/malloc.h> 43 #include <sys/osd.h> 44 #include <sys/priv.h> 45 #include <sys/proc.h> 46 #include <sys/taskqueue.h> 47 #include <sys/fcntl.h> 48 #include <sys/jail.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/racct.h> 52 #include <sys/refcount.h> 53 #include <sys/sx.h> 54 #include <sys/namei.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/socket.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/vnode.h> 61 62 #include <net/if.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 67 static void 68 prison_bcopy_primary_ip6(const struct prison *pr, struct in6_addr *ia6) 69 { 70 71 bcopy(prison_ip_get0(pr, PR_INET6), ia6, sizeof(struct in6_addr)); 72 } 73 74 int 75 prison_qcmp_v6(const void *ip1, const void *ip2) 76 { 77 const struct in6_addr *ia6a, *ia6b; 78 int i, rc; 79 80 ia6a = (const struct in6_addr *)ip1; 81 ia6b = (const struct in6_addr *)ip2; 82 83 rc = 0; 84 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 85 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 86 rc = 1; 87 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 88 rc = -1; 89 } 90 return (rc); 91 } 92 93 bool 94 prison_valid_v6(const void *ip) 95 { 96 const struct in6_addr *ia = ip; 97 98 return (!IN6_IS_ADDR_UNSPECIFIED(ia)); 99 } 100 101 /* 102 * Pass back primary IPv6 address for this jail. 103 * 104 * If not restricted return success but do not alter the address. Caller has 105 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 106 * 107 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 108 */ 109 int 110 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 111 { 112 struct prison *pr; 113 114 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 115 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 116 117 pr = cred->cr_prison; 118 if (!(pr->pr_flags & PR_IP6)) 119 return (0); 120 mtx_lock(&pr->pr_mtx); 121 if (!(pr->pr_flags & PR_IP6)) { 122 mtx_unlock(&pr->pr_mtx); 123 return (0); 124 } 125 if (pr->pr_addrs[PR_INET6] == NULL) { 126 mtx_unlock(&pr->pr_mtx); 127 return (EAFNOSUPPORT); 128 } 129 130 prison_bcopy_primary_ip6(pr, ia6); 131 mtx_unlock(&pr->pr_mtx); 132 return (0); 133 } 134 135 /* 136 * Return true if we should do proper source address selection or are not jailed. 137 * We will return false if we should bypass source address selection in favour 138 * of the primary jail IPv6 address. Only in this case *ia will be updated and 139 * returned in NBO. 140 * Return true, even in case this jail does not allow IPv6. 141 */ 142 bool 143 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 144 { 145 struct prison *pr; 146 struct in6_addr lia6; 147 148 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 149 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 150 151 if (!jailed(cred)) 152 return (true); 153 154 pr = cred->cr_prison; 155 if (pr->pr_flags & PR_IP6_SADDRSEL) 156 return (true); 157 158 lia6 = in6addr_any; 159 if (prison_get_ip6(cred, &lia6) != 0) 160 return (true); 161 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 162 return (true); 163 164 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 165 return (false); 166 } 167 168 /* 169 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 170 */ 171 bool 172 prison_equal_ip6(struct prison *pr1, struct prison *pr2) 173 { 174 175 if (pr1 == pr2) 176 return (true); 177 178 while (pr1 != &prison0 && 179 #ifdef VIMAGE 180 !(pr1->pr_flags & PR_VNET) && 181 #endif 182 !(pr1->pr_flags & PR_IP6_USER)) 183 pr1 = pr1->pr_parent; 184 while (pr2 != &prison0 && 185 #ifdef VIMAGE 186 !(pr2->pr_flags & PR_VNET) && 187 #endif 188 !(pr2->pr_flags & PR_IP6_USER)) 189 pr2 = pr2->pr_parent; 190 return (pr1 == pr2); 191 } 192 193 /* 194 * Make sure our (source) address is set to something meaningful to this jail. 195 * 196 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 197 * when needed while binding. 198 * 199 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 200 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 201 * doesn't allow IPv6. 202 */ 203 int 204 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 205 { 206 struct prison *pr; 207 int error; 208 209 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 210 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 211 212 pr = cred->cr_prison; 213 if (!(pr->pr_flags & PR_IP6)) 214 return (0); 215 mtx_lock(&pr->pr_mtx); 216 if (!(pr->pr_flags & PR_IP6)) { 217 mtx_unlock(&pr->pr_mtx); 218 return (0); 219 } 220 if (pr->pr_addrs[PR_INET6] == NULL) { 221 mtx_unlock(&pr->pr_mtx); 222 return (EAFNOSUPPORT); 223 } 224 225 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 226 /* 227 * In case there is only 1 IPv6 address, and v6only is true, 228 * then bind directly. 229 */ 230 if (v6only != 0 && prison_ip_cnt(pr, PR_INET6) == 1) 231 prison_bcopy_primary_ip6(pr, ia6); 232 mtx_unlock(&pr->pr_mtx); 233 return (0); 234 } 235 236 error = prison_check_ip6_locked(pr, ia6); 237 if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) { 238 prison_bcopy_primary_ip6(pr, ia6); 239 error = 0; 240 } 241 242 mtx_unlock(&pr->pr_mtx); 243 return (error); 244 } 245 246 /* 247 * Rewrite destination address in case we will connect to loopback address. 248 * 249 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 250 */ 251 int 252 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 253 { 254 struct prison *pr; 255 256 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 257 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 258 259 pr = cred->cr_prison; 260 if (!(pr->pr_flags & PR_IP6)) 261 return (0); 262 mtx_lock(&pr->pr_mtx); 263 if (!(pr->pr_flags & PR_IP6)) { 264 mtx_unlock(&pr->pr_mtx); 265 return (0); 266 } 267 if (pr->pr_addrs[PR_INET6] == NULL) { 268 mtx_unlock(&pr->pr_mtx); 269 return (EAFNOSUPPORT); 270 } 271 272 if (IN6_IS_ADDR_LOOPBACK(ia6) && 273 prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) { 274 prison_bcopy_primary_ip6(pr, ia6); 275 mtx_unlock(&pr->pr_mtx); 276 return (0); 277 } 278 279 /* 280 * Return success because nothing had to be changed. 281 */ 282 mtx_unlock(&pr->pr_mtx); 283 return (0); 284 } 285 286 /* 287 * Check if given address belongs to the jail referenced by cred/prison. 288 * 289 * Returns 0 if address belongs to jail, 290 * EADDRNOTAVAIL if the address doesn't belong to the jail. 291 */ 292 int 293 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6) 294 { 295 296 if (!(pr->pr_flags & PR_IP6)) 297 return (0); 298 299 return (prison_ip_check(pr, PR_INET6, ia6)); 300 } 301 302 int 303 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6) 304 { 305 struct prison *pr; 306 int error; 307 308 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 309 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 310 311 pr = cred->cr_prison; 312 if (!(pr->pr_flags & PR_IP6)) 313 return (0); 314 mtx_lock(&pr->pr_mtx); 315 if (!(pr->pr_flags & PR_IP6)) { 316 mtx_unlock(&pr->pr_mtx); 317 return (0); 318 } 319 if (pr->pr_addrs[PR_INET6] == NULL) { 320 mtx_unlock(&pr->pr_mtx); 321 return (EAFNOSUPPORT); 322 } 323 324 error = prison_check_ip6_locked(pr, ia6); 325 mtx_unlock(&pr->pr_mtx); 326 return (error); 327 } 328