diff options
Diffstat (limited to 'contrib/bind9/lib/isccfg/aclconf.c')
| -rw-r--r-- | contrib/bind9/lib/isccfg/aclconf.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/contrib/bind9/lib/isccfg/aclconf.c b/contrib/bind9/lib/isccfg/aclconf.c new file mode 100644 index 000000000000..469989afcebb --- /dev/null +++ b/contrib/bind9/lib/isccfg/aclconf.c @@ -0,0 +1,494 @@ +/* + * Copyright (C) 2004-2012 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2002 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id$ */ + +#include <config.h> + +#include <isc/mem.h> +#include <isc/string.h> /* Required for HP/UX (and others?) */ +#include <isc/util.h> + +#include <isccfg/namedconf.h> +#include <isccfg/aclconf.h> + +#include <dns/acl.h> +#include <dns/iptable.h> +#include <dns/fixedname.h> +#include <dns/log.h> + +#define LOOP_MAGIC ISC_MAGIC('L','O','O','P') + +isc_result_t +cfg_aclconfctx_create(isc_mem_t *mctx, cfg_aclconfctx_t **ret) { + isc_result_t result; + cfg_aclconfctx_t *actx; + + REQUIRE(mctx != NULL); + REQUIRE(ret != NULL && *ret == NULL); + + actx = isc_mem_get(mctx, sizeof(*actx)); + if (actx == NULL) + return (ISC_R_NOMEMORY); + + result = isc_refcount_init(&actx->references, 1); + if (result != ISC_R_SUCCESS) + goto cleanup; + + actx->mctx = NULL; + isc_mem_attach(mctx, &actx->mctx); + ISC_LIST_INIT(actx->named_acl_cache); + + *ret = actx; + return (ISC_R_SUCCESS); + + cleanup: + isc_mem_put(mctx, actx, sizeof(*actx)); + return (result); +} + +void +cfg_aclconfctx_attach(cfg_aclconfctx_t *src, cfg_aclconfctx_t **dest) { + REQUIRE(src != NULL); + REQUIRE(dest != NULL && *dest == NULL); + + isc_refcount_increment(&src->references, NULL); + *dest = src; +} + +void +cfg_aclconfctx_detach(cfg_aclconfctx_t **actxp) { + cfg_aclconfctx_t *actx; + dns_acl_t *dacl, *next; + unsigned int refs; + + REQUIRE(actxp != NULL && *actxp != NULL); + + actx = *actxp; + + isc_refcount_decrement(&actx->references, &refs); + if (refs == 0) { + for (dacl = ISC_LIST_HEAD(actx->named_acl_cache); + dacl != NULL; + dacl = next) + { + next = ISC_LIST_NEXT(dacl, nextincache); + ISC_LIST_UNLINK(actx->named_acl_cache, dacl, + nextincache); + dns_acl_detach(&dacl); + } + isc_mem_putanddetach(&actx->mctx, actx, sizeof(*actx)); + } + + *actxp = NULL; +} + +/* + * Find the definition of the named acl whose name is "name". + */ +static isc_result_t +get_acl_def(const cfg_obj_t *cctx, const char *name, const cfg_obj_t **ret) { + isc_result_t result; + const cfg_obj_t *acls = NULL; + const cfg_listelt_t *elt; + + result = cfg_map_get(cctx, "acl", &acls); + if (result != ISC_R_SUCCESS) + return (result); + for (elt = cfg_list_first(acls); + elt != NULL; + elt = cfg_list_next(elt)) { + const cfg_obj_t *acl = cfg_listelt_value(elt); + const char *aclname = cfg_obj_asstring(cfg_tuple_get(acl, "name")); + if (strcasecmp(aclname, name) == 0) { + if (ret != NULL) { + *ret = cfg_tuple_get(acl, "value"); + } + return (ISC_R_SUCCESS); + } + } + return (ISC_R_NOTFOUND); +} + +static isc_result_t +convert_named_acl(const cfg_obj_t *nameobj, const cfg_obj_t *cctx, + isc_log_t *lctx, cfg_aclconfctx_t *ctx, + isc_mem_t *mctx, unsigned int nest_level, + dns_acl_t **target) +{ + isc_result_t result; + const cfg_obj_t *cacl = NULL; + dns_acl_t *dacl; + dns_acl_t loop; + const char *aclname = cfg_obj_asstring(nameobj); + + /* Look for an already-converted version. */ + for (dacl = ISC_LIST_HEAD(ctx->named_acl_cache); + dacl != NULL; + dacl = ISC_LIST_NEXT(dacl, nextincache)) + { + if (strcasecmp(aclname, dacl->name) == 0) { + if (ISC_MAGIC_VALID(dacl, LOOP_MAGIC)) { + cfg_obj_log(nameobj, lctx, ISC_LOG_ERROR, + "acl loop detected: %s", aclname); + return (ISC_R_FAILURE); + } + dns_acl_attach(dacl, target); + return (ISC_R_SUCCESS); + } + } + /* Not yet converted. Convert now. */ + result = get_acl_def(cctx, aclname, &cacl); + if (result != ISC_R_SUCCESS) { + cfg_obj_log(nameobj, lctx, ISC_LOG_WARNING, + "undefined ACL '%s'", aclname); + return (result); + } + /* + * Add a loop detection element. + */ + memset(&loop, 0, sizeof(loop)); + ISC_LINK_INIT(&loop, nextincache); + DE_CONST(aclname, loop.name); + loop.magic = LOOP_MAGIC; + ISC_LIST_APPEND(ctx->named_acl_cache, &loop, nextincache); + result = cfg_acl_fromconfig(cacl, cctx, lctx, ctx, mctx, + nest_level, &dacl); + ISC_LIST_UNLINK(ctx->named_acl_cache, &loop, nextincache); + loop.magic = 0; + loop.name = NULL; + if (result != ISC_R_SUCCESS) + return (result); + dacl->name = isc_mem_strdup(dacl->mctx, aclname); + if (dacl->name == NULL) + return (ISC_R_NOMEMORY); + ISC_LIST_APPEND(ctx->named_acl_cache, dacl, nextincache); + dns_acl_attach(dacl, target); + return (ISC_R_SUCCESS); +} + +static isc_result_t +convert_keyname(const cfg_obj_t *keyobj, isc_log_t *lctx, isc_mem_t *mctx, + dns_name_t *dnsname) +{ + isc_result_t result; + isc_buffer_t buf; + dns_fixedname_t fixname; + unsigned int keylen; + const char *txtname = cfg_obj_asstring(keyobj); + + keylen = strlen(txtname); + isc_buffer_init(&buf, txtname, keylen); + isc_buffer_add(&buf, keylen); + dns_fixedname_init(&fixname); + result = dns_name_fromtext(dns_fixedname_name(&fixname), &buf, + dns_rootname, 0, NULL); + if (result != ISC_R_SUCCESS) { + cfg_obj_log(keyobj, lctx, ISC_LOG_WARNING, + "key name '%s' is not a valid domain name", + txtname); + return (result); + } + return (dns_name_dup(dns_fixedname_name(&fixname), mctx, dnsname)); +} + +/* + * Recursively pre-parse an ACL definition to find the total number + * of non-IP-prefix elements (localhost, localnets, key) in all nested + * ACLs, so that the parent will have enough space allocated for the + * elements table after all the nested ACLs have been merged in to the + * parent. + */ +static int +count_acl_elements(const cfg_obj_t *caml, const cfg_obj_t *cctx, + isc_boolean_t *has_negative) +{ + const cfg_listelt_t *elt; + const cfg_obj_t *cacl = NULL; + isc_result_t result; + int n = 0; + + if (has_negative != NULL) + *has_negative = ISC_FALSE; + + for (elt = cfg_list_first(caml); + elt != NULL; + elt = cfg_list_next(elt)) { + const cfg_obj_t *ce = cfg_listelt_value(elt); + + /* negated element; just get the value. */ + if (cfg_obj_istuple(ce)) { + ce = cfg_tuple_get(ce, "value"); + if (has_negative != NULL) + *has_negative = ISC_TRUE; + } + + if (cfg_obj_istype(ce, &cfg_type_keyref)) { + n++; + } else if (cfg_obj_islist(ce)) { + isc_boolean_t negative; + n += count_acl_elements(ce, cctx, &negative); + if (negative) + n++; + } else if (cfg_obj_isstring(ce)) { + const char *name = cfg_obj_asstring(ce); + if (strcasecmp(name, "localhost") == 0 || + strcasecmp(name, "localnets") == 0) { + n++; + } else if (strcasecmp(name, "any") != 0 && + strcasecmp(name, "none") != 0) { + result = get_acl_def(cctx, name, &cacl); + if (result == ISC_R_SUCCESS) + n += count_acl_elements(cacl, cctx, + NULL) + 1; + } + } + } + + return n; +} + +isc_result_t +cfg_acl_fromconfig(const cfg_obj_t *caml, + const cfg_obj_t *cctx, + isc_log_t *lctx, + cfg_aclconfctx_t *ctx, + isc_mem_t *mctx, + unsigned int nest_level, + dns_acl_t **target) +{ + isc_result_t result; + dns_acl_t *dacl = NULL, *inneracl = NULL; + dns_aclelement_t *de; + const cfg_listelt_t *elt; + dns_iptable_t *iptab; + int new_nest_level = 0; + + if (nest_level != 0) + new_nest_level = nest_level - 1; + + REQUIRE(target != NULL); + REQUIRE(*target == NULL || DNS_ACL_VALID(*target)); + + if (*target != NULL) { + /* + * If target already points to an ACL, then we're being + * called recursively to configure a nested ACL. The + * nested ACL's contents should just be absorbed into its + * parent ACL. + */ + dns_acl_attach(*target, &dacl); + dns_acl_detach(target); + } else { + /* + * Need to allocate a new ACL structure. Count the items + * in the ACL definition that will require space in the + * elements table. (Note that if nest_level is nonzero, + * *everything* goes in the elements table.) + */ + int nelem; + + if (nest_level == 0) + nelem = count_acl_elements(caml, cctx, NULL); + else + nelem = cfg_list_length(caml, ISC_FALSE); + + result = dns_acl_create(mctx, nelem, &dacl); + if (result != ISC_R_SUCCESS) + return (result); + } + + de = dacl->elements; + for (elt = cfg_list_first(caml); + elt != NULL; + elt = cfg_list_next(elt)) { + const cfg_obj_t *ce = cfg_listelt_value(elt); + isc_boolean_t neg; + + if (cfg_obj_istuple(ce)) { + /* This must be a negated element. */ + ce = cfg_tuple_get(ce, "value"); + neg = ISC_TRUE; + dacl->has_negatives = ISC_TRUE; + } else + neg = ISC_FALSE; + + /* + * If nest_level is nonzero, then every element is + * to be stored as a separate, nested ACL rather than + * merged into the main iptable. + */ + iptab = dacl->iptable; + + if (nest_level != 0) { + result = dns_acl_create(mctx, + cfg_list_length(ce, ISC_FALSE), + &de->nestedacl); + if (result != ISC_R_SUCCESS) + goto cleanup; + iptab = de->nestedacl->iptable; + } + + if (cfg_obj_isnetprefix(ce)) { + /* Network prefix */ + isc_netaddr_t addr; + unsigned int bitlen; + + cfg_obj_asnetprefix(ce, &addr, &bitlen); + + /* + * If nesting ACLs (nest_level != 0), we negate + * the nestedacl element, not the iptable entry. + */ + result = dns_iptable_addprefix(iptab, &addr, bitlen, + ISC_TF(nest_level != 0 || !neg)); + if (result != ISC_R_SUCCESS) + goto cleanup; + + if (nest_level > 0) { + de->type = dns_aclelementtype_nestedacl; + de->negative = neg; + } else + continue; + } else if (cfg_obj_islist(ce)) { + /* + * If we're nesting ACLs, put the nested + * ACL onto the elements list; otherwise + * merge it into *this* ACL. We nest ACLs + * in two cases: 1) sortlist, 2) if the + * nested ACL contains negated members. + */ + if (inneracl != NULL) + dns_acl_detach(&inneracl); + result = cfg_acl_fromconfig(ce, cctx, lctx, + ctx, mctx, new_nest_level, + &inneracl); + if (result != ISC_R_SUCCESS) + goto cleanup; +nested_acl: + if (nest_level > 0 || inneracl->has_negatives) { + de->type = dns_aclelementtype_nestedacl; + de->negative = neg; + if (de->nestedacl != NULL) + dns_acl_detach(&de->nestedacl); + dns_acl_attach(inneracl, + &de->nestedacl); + dns_acl_detach(&inneracl); + /* Fall through. */ + } else { + dns_acl_merge(dacl, inneracl, + ISC_TF(!neg)); + de += inneracl->length; /* elements added */ + dns_acl_detach(&inneracl); + continue; + } + } else if (cfg_obj_istype(ce, &cfg_type_keyref)) { + /* Key name. */ + de->type = dns_aclelementtype_keyname; + de->negative = neg; + dns_name_init(&de->keyname, NULL); + result = convert_keyname(ce, lctx, mctx, + &de->keyname); + if (result != ISC_R_SUCCESS) + goto cleanup; + } else if (cfg_obj_isstring(ce)) { + /* ACL name. */ + const char *name = cfg_obj_asstring(ce); + if (strcasecmp(name, "any") == 0) { + /* Iptable entry with zero bit length. */ + result = dns_iptable_addprefix(iptab, NULL, 0, + ISC_TF(nest_level != 0 || !neg)); + if (result != ISC_R_SUCCESS) + goto cleanup; + + if (nest_level != 0) { + de->type = dns_aclelementtype_nestedacl; + de->negative = neg; + } else + continue; + } else if (strcasecmp(name, "none") == 0) { + /* none == !any */ + /* + * We don't unconditional set + * dacl->has_negatives and + * de->negative to true so we can handle + * "!none;". + */ + result = dns_iptable_addprefix(iptab, NULL, 0, + ISC_TF(nest_level != 0 || neg)); + if (result != ISC_R_SUCCESS) + goto cleanup; + + if (!neg) + dacl->has_negatives = !neg; + + if (nest_level != 0) { + de->type = dns_aclelementtype_nestedacl; + de->negative = !neg; + } else + continue; + } else if (strcasecmp(name, "localhost") == 0) { + de->type = dns_aclelementtype_localhost; + de->negative = neg; + } else if (strcasecmp(name, "localnets") == 0) { + de->type = dns_aclelementtype_localnets; + de->negative = neg; + } else { + if (inneracl != NULL) + dns_acl_detach(&inneracl); + result = convert_named_acl(ce, cctx, lctx, ctx, + mctx, new_nest_level, + &inneracl); + if (result != ISC_R_SUCCESS) + goto cleanup; + + goto nested_acl; + } + } else { + cfg_obj_log(ce, lctx, ISC_LOG_WARNING, + "address match list contains " + "unsupported element type"); + result = ISC_R_FAILURE; + goto cleanup; + } + + /* + * This should only be reached for localhost, localnets + * and keyname elements, and nested ACLs if nest_level is + * nonzero (i.e., in sortlists). + */ + if (de->nestedacl != NULL && + de->type != dns_aclelementtype_nestedacl) + dns_acl_detach(&de->nestedacl); + + dacl->node_count++; + de->node_num = dacl->node_count; + + dacl->length++; + de++; + INSIST(dacl->length <= dacl->alloc); + } + + dns_acl_attach(dacl, target); + result = ISC_R_SUCCESS; + + cleanup: + if (inneracl != NULL) + dns_acl_detach(&inneracl); + dns_acl_detach(&dacl); + return (result); +} |