/*- * Copyright (c) 1999 Poul-Henning Kamp. * Copyright (c) 2008 Bjoern A. Zeeb. * Copyright (c) 2009 James Gritton. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include "opt_ddb.h" #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static in_addr_t prison_primary_ip4(const struct prison *pr) { return (((const struct in_addr *)prison_ip_get0(pr, PR_INET))->s_addr); } int prison_qcmp_v4(const void *ip1, const void *ip2) { in_addr_t iaa, iab; /* * We need to compare in HBO here to get the list sorted as expected * by the result of the code. Sorting NBO addresses gives you * interesting results. If you do not understand, do not try. */ iaa = ntohl(((const struct in_addr *)ip1)->s_addr); iab = ntohl(((const struct in_addr *)ip2)->s_addr); /* * Do not simply return the difference of the two numbers, the int is * not wide enough. */ if (iaa > iab) return (1); else if (iaa < iab) return (-1); else return (0); } bool prison_valid_v4(const void *ip) { in_addr_t ia = ((const struct in_addr *)ip)->s_addr; /* * We do not have to care about byte order for these * checks so we will do them in NBO. */ return (ia != INADDR_ANY && ia != INADDR_BROADCAST); } /* * Pass back primary IPv4 address of this jail. * * If not restricted return success but do not alter the address. Caller has * to make sure to initialize it correctly (e.g. INADDR_ANY). * * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. * Address returned in NBO. */ int prison_get_ip4(struct ucred *cred, struct in_addr *ia) { struct prison *pr; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP4)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP4)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } ia->s_addr = prison_primary_ip4(pr); mtx_unlock(&pr->pr_mtx); return (0); } /* * Return true if we should do proper source address selection or are not jailed. * We will return false if we should bypass source address selection in favour * of the primary jail IPv4 address. Only in this case *ia will be updated and * returned in NBO. * Return true, even in case this jail does not allow IPv4. */ bool prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) { struct prison *pr; struct in_addr lia; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); if (!jailed(cred)) return (true); pr = cred->cr_prison; if (pr->pr_flags & PR_IP4_SADDRSEL) return (true); lia.s_addr = INADDR_ANY; if (prison_get_ip4(cred, &lia) != 0) return (true); if (lia.s_addr == INADDR_ANY) return (true); ia->s_addr = lia.s_addr; return (false); } /* * Return true if pr1 and pr2 have the same IPv4 address restrictions. */ bool prison_equal_ip4(struct prison *pr1, struct prison *pr2) { if (pr1 == pr2) return (true); /* * No need to lock since the PR_IP4_USER flag can't be altered for * existing prisons. */ while (pr1 != &prison0 && #ifdef VIMAGE !(pr1->pr_flags & PR_VNET) && #endif !(pr1->pr_flags & PR_IP4_USER)) pr1 = pr1->pr_parent; while (pr2 != &prison0 && #ifdef VIMAGE !(pr2->pr_flags & PR_VNET) && #endif !(pr2->pr_flags & PR_IP4_USER)) pr2 = pr2->pr_parent; return (pr1 == pr2); } /* * Make sure our (source) address is set to something meaningful to this * jail. * * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail * doesn't allow IPv4. Address passed in in NBO and returned in NBO. */ int prison_local_ip4(struct ucred *cred, struct in_addr *ia) { struct prison *pr; struct in_addr ia0; int error; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP4)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP4)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } ia0.s_addr = ntohl(ia->s_addr); if (ia0.s_addr == INADDR_ANY) { /* * In case there is only 1 IPv4 address, bind directly. */ if (prison_ip_cnt(pr, PR_INET) == 1) ia->s_addr = prison_primary_ip4(pr); mtx_unlock(&pr->pr_mtx); return (0); } error = prison_check_ip4_locked(pr, ia); if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) { ia->s_addr = prison_primary_ip4(pr); error = 0; } mtx_unlock(&pr->pr_mtx); return (error); } /* * Rewrite destination address in case we will connect to loopback address. * * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. * Address passed in in NBO and returned in NBO. */ int prison_remote_ip4(struct ucred *cred, struct in_addr *ia) { struct prison *pr; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP4)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP4)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } if (ntohl(ia->s_addr) == INADDR_LOOPBACK && prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) { ia->s_addr = prison_primary_ip4(pr); mtx_unlock(&pr->pr_mtx); return (0); } /* * Return success because nothing had to be changed. */ mtx_unlock(&pr->pr_mtx); return (0); } /* * Check if given address belongs to the jail referenced by cred/prison. * * Returns 0 if address belongs to jail, * EADDRNOTAVAIL if the address doesn't belong to the jail. */ int prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia) { if (!(pr->pr_flags & PR_IP4)) return (0); return (prison_ip_check(pr, PR_INET, ia)); } int prison_check_ip4(const struct ucred *cred, const struct in_addr *ia) { struct prison *pr; int error; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP4)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP4)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } error = prison_check_ip4_locked(pr, ia); mtx_unlock(&pr->pr_mtx); return (error); }