/* * Portions Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC") * Portions Copyright (C) 1999-2003 Internet Software Consortium. * Portions Copyright (C) 1995-2000 by Network Associates, Inc. * * Permission to use, copy, modify, and 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 AND NETWORK ASSOCIATES 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. */ /* * Principal Author: Brian Wellington * $ISC: dst_api.c,v 1.1.6.7 2006/01/27 23:57:44 marka Exp $ */ /*! \file */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dst_internal.h" #define DST_AS_STR(t) ((t).value.as_textregion.base) static dst_func_t *dst_t_func[DST_MAX_ALGS]; static isc_entropy_t *dst_entropy_pool = NULL; static unsigned int dst_entropy_flags = 0; static isc_boolean_t dst_initialized = ISC_FALSE; isc_mem_t *dst__memory_pool = NULL; /* * Static functions. */ static dst_key_t * get_key_struct(dns_name_t *name, unsigned int alg, unsigned int flags, unsigned int protocol, unsigned int bits, dns_rdataclass_t rdclass, isc_mem_t *mctx); static isc_result_t write_public_key(const dst_key_t *key, int type, const char *directory); static isc_result_t buildfilename(dns_name_t *name, dns_keytag_t id, unsigned int alg, unsigned int type, const char *directory, isc_buffer_t *out); static isc_result_t computeid(dst_key_t *key); static isc_result_t frombuffer(dns_name_t *name, unsigned int alg, unsigned int flags, unsigned int protocol, dns_rdataclass_t rdclass, isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp); static isc_result_t algorithm_status(unsigned int alg); static isc_result_t addsuffix(char *filename, unsigned int len, const char *ofilename, const char *suffix); #define RETERR(x) \ do { \ result = (x); \ if (result != ISC_R_SUCCESS) \ goto out; \ } while (0) #define CHECKALG(alg) \ do { \ isc_result_t _r; \ _r = algorithm_status(alg); \ if (_r != ISC_R_SUCCESS) \ return (_r); \ } while (0); \ static void * default_memalloc(void *arg, size_t size) { UNUSED(arg); if (size == 0U) size = 1; return (malloc(size)); } static void default_memfree(void *arg, void *ptr) { UNUSED(arg); free(ptr); } isc_result_t dst_lib_init(isc_mem_t *mctx, isc_entropy_t *ectx, unsigned int eflags) { isc_result_t result; REQUIRE(mctx != NULL && ectx != NULL); REQUIRE(dst_initialized == ISC_FALSE); dst__memory_pool = NULL; #ifdef OPENSSL UNUSED(mctx); /* * When using --with-openssl, there seems to be no good way of not * leaking memory due to the openssl error handling mechanism. * Avoid assertions by using a local memory context and not checking * for leaks on exit. Note: as there are leaks we cannot use * ISC_MEMFLAG_INTERNAL as it will free up memory still being used * by libcrypto. */ result = isc_mem_createx2(0, 0, default_memalloc, default_memfree, NULL, &dst__memory_pool, 0); if (result != ISC_R_SUCCESS) return (result); isc_mem_setdestroycheck(dst__memory_pool, ISC_FALSE); #else isc_mem_attach(mctx, &dst__memory_pool); #endif isc_entropy_attach(ectx, &dst_entropy_pool); dst_entropy_flags = eflags; dst_result_register(); memset(dst_t_func, 0, sizeof(dst_t_func)); RETERR(dst__hmacmd5_init(&dst_t_func[DST_ALG_HMACMD5])); RETERR(dst__hmacsha1_init(&dst_t_func[DST_ALG_HMACSHA1])); RETERR(dst__hmacsha224_init(&dst_t_func[DST_ALG_HMACSHA224])); RETERR(dst__hmacsha256_init(&dst_t_func[DST_ALG_HMACSHA256])); RETERR(dst__hmacsha384_init(&dst_t_func[DST_ALG_HMACSHA384])); RETERR(dst__hmacsha512_init(&dst_t_func[DST_ALG_HMACSHA512])); #ifdef OPENSSL RETERR(dst__openssl_init()); RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSAMD5])); RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSASHA1])); #ifdef HAVE_OPENSSL_DSA RETERR(dst__openssldsa_init(&dst_t_func[DST_ALG_DSA])); #endif RETERR(dst__openssldh_init(&dst_t_func[DST_ALG_DH])); #endif /* OPENSSL */ #ifdef GSSAPI RETERR(dst__gssapi_init(&dst_t_func[DST_ALG_GSSAPI])); #endif dst_initialized = ISC_TRUE; return (ISC_R_SUCCESS); out: dst_lib_destroy(); return (result); } void dst_lib_destroy(void) { int i; RUNTIME_CHECK(dst_initialized == ISC_TRUE); dst_initialized = ISC_FALSE; for (i = 0; i < DST_MAX_ALGS; i++) if (dst_t_func[i] != NULL && dst_t_func[i]->cleanup != NULL) dst_t_func[i]->cleanup(); #ifdef OPENSSL dst__openssl_destroy(); #endif if (dst__memory_pool != NULL) isc_mem_detach(&dst__memory_pool); if (dst_entropy_pool != NULL) isc_entropy_detach(&dst_entropy_pool); } isc_boolean_t dst_algorithm_supported(unsigned int alg) { REQUIRE(dst_initialized == ISC_TRUE); if (alg >= DST_MAX_ALGS || dst_t_func[alg] == NULL) return (ISC_FALSE); return (ISC_TRUE); } isc_result_t dst_context_create(dst_key_t *key, isc_mem_t *mctx, dst_context_t **dctxp) { dst_context_t *dctx; isc_result_t result; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(mctx != NULL); REQUIRE(dctxp != NULL && *dctxp == NULL); if (key->func->createctx == NULL) return (DST_R_UNSUPPORTEDALG); if (key->opaque == NULL) return (DST_R_NULLKEY); dctx = isc_mem_get(mctx, sizeof(dst_context_t)); if (dctx == NULL) return (ISC_R_NOMEMORY); dctx->key = key; dctx->mctx = mctx; result = key->func->createctx(key, dctx); if (result != ISC_R_SUCCESS) { isc_mem_put(mctx, dctx, sizeof(dst_context_t)); return (result); } dctx->magic = CTX_MAGIC; *dctxp = dctx; return (ISC_R_SUCCESS); } void dst_context_destroy(dst_context_t **dctxp) { dst_context_t *dctx; REQUIRE(dctxp != NULL && VALID_CTX(*dctxp)); dctx = *dctxp; INSIST(dctx->key->func->destroyctx != NULL); dctx->key->func->destroyctx(dctx); dctx->magic = 0; isc_mem_put(dctx->mctx, dctx, sizeof(dst_context_t)); *dctxp = NULL; } isc_result_t dst_context_adddata(dst_context_t *dctx, const isc_region_t *data) { REQUIRE(VALID_CTX(dctx)); REQUIRE(data != NULL); INSIST(dctx->key->func->adddata != NULL); return (dctx->key->func->adddata(dctx, data)); } isc_result_t dst_context_sign(dst_context_t *dctx, isc_buffer_t *sig) { dst_key_t *key; REQUIRE(VALID_CTX(dctx)); REQUIRE(sig != NULL); key = dctx->key; CHECKALG(key->key_alg); if (key->opaque == NULL) return (DST_R_NULLKEY); if (key->func->sign == NULL) return (DST_R_NOTPRIVATEKEY); if (key->func->isprivate == NULL || key->func->isprivate(key) == ISC_FALSE) return (DST_R_NOTPRIVATEKEY); return (key->func->sign(dctx, sig)); } isc_result_t dst_context_verify(dst_context_t *dctx, isc_region_t *sig) { REQUIRE(VALID_CTX(dctx)); REQUIRE(sig != NULL); CHECKALG(dctx->key->key_alg); if (dctx->key->opaque == NULL) return (DST_R_NULLKEY); if (dctx->key->func->verify == NULL) return (DST_R_NOTPUBLICKEY); return (dctx->key->func->verify(dctx, sig)); } isc_result_t dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv, isc_buffer_t *secret) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(pub) && VALID_KEY(priv)); REQUIRE(secret != NULL); CHECKALG(pub->key_alg); CHECKALG(priv->key_alg); if (pub->opaque == NULL || priv->opaque == NULL) return (DST_R_NULLKEY); if (pub->key_alg != priv->key_alg || pub->func->computesecret == NULL || priv->func->computesecret == NULL) return (DST_R_KEYCANNOTCOMPUTESECRET); if (dst_key_isprivate(priv) == ISC_FALSE) return (DST_R_NOTPRIVATEKEY); return (pub->func->computesecret(pub, priv, secret)); } isc_result_t dst_key_tofile(const dst_key_t *key, int type, const char *directory) { isc_result_t ret = ISC_R_SUCCESS; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0); CHECKALG(key->key_alg); if (key->func->tofile == NULL) return (DST_R_UNSUPPORTEDALG); if (type & DST_TYPE_PUBLIC) { ret = write_public_key(key, type, directory); if (ret != ISC_R_SUCCESS) return (ret); } if ((type & DST_TYPE_PRIVATE) && (key->key_flags & DNS_KEYFLAG_TYPEMASK) != DNS_KEYTYPE_NOKEY) return (key->func->tofile(key, directory)); else return (ISC_R_SUCCESS); } isc_result_t dst_key_fromfile(dns_name_t *name, dns_keytag_t id, unsigned int alg, int type, const char *directory, isc_mem_t *mctx, dst_key_t **keyp) { char filename[ISC_DIR_NAMEMAX]; isc_buffer_t b; dst_key_t *key; isc_result_t result; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(dns_name_isabsolute(name)); REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0); REQUIRE(mctx != NULL); REQUIRE(keyp != NULL && *keyp == NULL); CHECKALG(alg); isc_buffer_init(&b, filename, sizeof(filename)); result = buildfilename(name, id, alg, type, directory, &b); if (result != ISC_R_SUCCESS) return (result); key = NULL; result = dst_key_fromnamedfile(filename, type, mctx, &key); if (result != ISC_R_SUCCESS) return (result); result = computeid(key); if (result != ISC_R_SUCCESS) { dst_key_free(&key); return (result); } if (!dns_name_equal(name, key->key_name) || id != key->key_id || alg != key->key_alg) { dst_key_free(&key); return (DST_R_INVALIDPRIVATEKEY); } key->key_id = id; *keyp = key; return (ISC_R_SUCCESS); } isc_result_t dst_key_fromnamedfile(const char *filename, int type, isc_mem_t *mctx, dst_key_t **keyp) { isc_result_t result; dst_key_t *pubkey = NULL, *key = NULL; dns_keytag_t id; char *newfilename = NULL; int newfilenamelen = 0; isc_lex_t *lex = NULL; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(filename != NULL); REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0); REQUIRE(mctx != NULL); REQUIRE(keyp != NULL && *keyp == NULL); newfilenamelen = strlen(filename) + 5; newfilename = isc_mem_get(mctx, newfilenamelen); if (newfilename == NULL) return (ISC_R_NOMEMORY); result = addsuffix(newfilename, newfilenamelen, filename, ".key"); INSIST(result == ISC_R_SUCCESS); result = dst_key_read_public(newfilename, type, mctx, &pubkey); isc_mem_put(mctx, newfilename, newfilenamelen); newfilename = NULL; if (result != ISC_R_SUCCESS) return (result); if ((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) == DST_TYPE_PUBLIC || (pubkey->key_flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY) { result = computeid(pubkey); if (result != ISC_R_SUCCESS) { dst_key_free(&pubkey); return (result); } *keyp = pubkey; return (ISC_R_SUCCESS); } result = algorithm_status(pubkey->key_alg); if (result != ISC_R_SUCCESS) { dst_key_free(&pubkey); return (result); } key = get_key_struct(pubkey->key_name, pubkey->key_alg, pubkey->key_flags, pubkey->key_proto, 0, pubkey->key_class, mctx); id = pubkey->key_id; dst_key_free(&pubkey); if (key == NULL) return (ISC_R_NOMEMORY); if (key->func->parse == NULL) RETERR(DST_R_UNSUPPORTEDALG); newfilenamelen = strlen(filename) + 9; newfilename = isc_mem_get(mctx, newfilenamelen); if (newfilename == NULL) RETERR(ISC_R_NOMEMORY); result = addsuffix(newfilename, newfilenamelen, filename, ".private"); INSIST(result == ISC_R_SUCCESS); RETERR(isc_lex_create(mctx, 1500, &lex)); RETERR(isc_lex_openfile(lex, newfilename)); isc_mem_put(mctx, newfilename, newfilenamelen); RETERR(key->func->parse(key, lex)); isc_lex_destroy(&lex); RETERR(computeid(key)); if (id != key->key_id) RETERR(DST_R_INVALIDPRIVATEKEY); *keyp = key; return (ISC_R_SUCCESS); out: if (newfilename != NULL) isc_mem_put(mctx, newfilename, newfilenamelen); if (lex != NULL) isc_lex_destroy(&lex); dst_key_free(&key); return (result); } isc_result_t dst_key_todns(const dst_key_t *key, isc_buffer_t *target) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(target != NULL); CHECKALG(key->key_alg); if (key->func->todns == NULL) return (DST_R_UNSUPPORTEDALG); if (isc_buffer_availablelength(target) < 4) return (ISC_R_NOSPACE); isc_buffer_putuint16(target, (isc_uint16_t)(key->key_flags & 0xffff)); isc_buffer_putuint8(target, (isc_uint8_t)key->key_proto); isc_buffer_putuint8(target, (isc_uint8_t)key->key_alg); if (key->key_flags & DNS_KEYFLAG_EXTENDED) { if (isc_buffer_availablelength(target) < 2) return (ISC_R_NOSPACE); isc_buffer_putuint16(target, (isc_uint16_t)((key->key_flags >> 16) & 0xffff)); } if (key->opaque == NULL) /*%< NULL KEY */ return (ISC_R_SUCCESS); return (key->func->todns(key, target)); } isc_result_t dst_key_fromdns(dns_name_t *name, dns_rdataclass_t rdclass, isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) { isc_uint8_t alg, proto; isc_uint32_t flags, extflags; dst_key_t *key = NULL; dns_keytag_t id; isc_region_t r; isc_result_t result; REQUIRE(dst_initialized); isc_buffer_remainingregion(source, &r); if (isc_buffer_remaininglength(source) < 4) return (DST_R_INVALIDPUBLICKEY); flags = isc_buffer_getuint16(source); proto = isc_buffer_getuint8(source); alg = isc_buffer_getuint8(source); id = dst_region_computeid(&r, alg); if (flags & DNS_KEYFLAG_EXTENDED) { if (isc_buffer_remaininglength(source) < 2) return (DST_R_INVALIDPUBLICKEY); extflags = isc_buffer_getuint16(source); flags |= (extflags << 16); } result = frombuffer(name, alg, flags, proto, rdclass, source, mctx, &key); if (result != ISC_R_SUCCESS) return (result); key->key_id = id; *keyp = key; return (ISC_R_SUCCESS); } isc_result_t dst_key_frombuffer(dns_name_t *name, unsigned int alg, unsigned int flags, unsigned int protocol, dns_rdataclass_t rdclass, isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) { dst_key_t *key = NULL; isc_result_t result; REQUIRE(dst_initialized); result = frombuffer(name, alg, flags, protocol, rdclass, source, mctx, &key); if (result != ISC_R_SUCCESS) return (result); result = computeid(key); if (result != ISC_R_SUCCESS) { dst_key_free(&key); return (result); } *keyp = key; return (ISC_R_SUCCESS); } isc_result_t dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(target != NULL); CHECKALG(key->key_alg); if (key->func->todns == NULL) return (DST_R_UNSUPPORTEDALG); return (key->func->todns(key, target)); } isc_result_t dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer) { isc_lex_t *lex = NULL; isc_result_t result = ISC_R_SUCCESS; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(!dst_key_isprivate(key)); REQUIRE(buffer != NULL); if (key->func->parse == NULL) RETERR(DST_R_UNSUPPORTEDALG); RETERR(isc_lex_create(key->mctx, 1500, &lex)); RETERR(isc_lex_openbuffer(lex, buffer)); RETERR(key->func->parse(key, lex)); out: if (lex != NULL) isc_lex_destroy(&lex); return (result); } isc_result_t dst_key_fromgssapi(dns_name_t *name, void *opaque, isc_mem_t *mctx, dst_key_t **keyp) { dst_key_t *key; REQUIRE(opaque != NULL); REQUIRE(keyp != NULL && *keyp == NULL); key = get_key_struct(name, DST_ALG_GSSAPI, 0, DNS_KEYPROTO_DNSSEC, 0, dns_rdataclass_in, mctx); if (key == NULL) return (ISC_R_NOMEMORY); key->opaque = opaque; *keyp = key; return (ISC_R_SUCCESS); } isc_result_t dst_key_generate(dns_name_t *name, unsigned int alg, unsigned int bits, unsigned int param, unsigned int flags, unsigned int protocol, dns_rdataclass_t rdclass, isc_mem_t *mctx, dst_key_t **keyp) { dst_key_t *key; isc_result_t ret; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(dns_name_isabsolute(name)); REQUIRE(mctx != NULL); REQUIRE(keyp != NULL && *keyp == NULL); CHECKALG(alg); key = get_key_struct(name, alg, flags, protocol, bits, rdclass, mctx); if (key == NULL) return (ISC_R_NOMEMORY); if (bits == 0) { /*%< NULL KEY */ key->key_flags |= DNS_KEYTYPE_NOKEY; *keyp = key; return (ISC_R_SUCCESS); } if (key->func->generate == NULL) { dst_key_free(&key); return (DST_R_UNSUPPORTEDALG); } ret = key->func->generate(key, param); if (ret != ISC_R_SUCCESS) { dst_key_free(&key); return (ret); } ret = computeid(key); if (ret != ISC_R_SUCCESS) { dst_key_free(&key); return (ret); } *keyp = key; return (ISC_R_SUCCESS); } isc_boolean_t dst_key_compare(const dst_key_t *key1, const dst_key_t *key2) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key1)); REQUIRE(VALID_KEY(key2)); if (key1 == key2) return (ISC_TRUE); if (key1 == NULL || key2 == NULL) return (ISC_FALSE); if (key1->key_alg == key2->key_alg && key1->key_id == key2->key_id && key1->func->compare != NULL && key1->func->compare(key1, key2) == ISC_TRUE) return (ISC_TRUE); else return (ISC_FALSE); } isc_boolean_t dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key1)); REQUIRE(VALID_KEY(key2)); if (key1 == key2) return (ISC_TRUE); if (key1 == NULL || key2 == NULL) return (ISC_FALSE); if (key1->key_alg == key2->key_alg && key1->func->paramcompare != NULL && key1->func->paramcompare(key1, key2) == ISC_TRUE) return (ISC_TRUE); else return (ISC_FALSE); } void dst_key_free(dst_key_t **keyp) { isc_mem_t *mctx; dst_key_t *key; REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(keyp != NULL && VALID_KEY(*keyp)); key = *keyp; mctx = key->mctx; if (key->opaque != NULL) { INSIST(key->func->destroy != NULL); key->func->destroy(key); } dns_name_free(key->key_name, mctx); isc_mem_put(mctx, key->key_name, sizeof(dns_name_t)); memset(key, 0, sizeof(dst_key_t)); isc_mem_put(mctx, key, sizeof(dst_key_t)); *keyp = NULL; } isc_boolean_t dst_key_isprivate(const dst_key_t *key) { REQUIRE(VALID_KEY(key)); INSIST(key->func->isprivate != NULL); return (key->func->isprivate(key)); } isc_result_t dst_key_buildfilename(const dst_key_t *key, int type, const char *directory, isc_buffer_t *out) { REQUIRE(VALID_KEY(key)); REQUIRE(type == DST_TYPE_PRIVATE || type == DST_TYPE_PUBLIC || type == 0); return (buildfilename(key->key_name, key->key_id, key->key_alg, type, directory, out)); } isc_result_t dst_key_sigsize(const dst_key_t *key, unsigned int *n) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(n != NULL); /* XXXVIX this switch statement is too sparse to gen a jump table. */ switch (key->key_alg) { case DST_ALG_RSAMD5: case DST_ALG_RSASHA1: *n = (key->key_size + 7) / 8; break; case DST_ALG_DSA: *n = DNS_SIG_DSASIGSIZE; break; case DST_ALG_HMACMD5: *n = 16; break; case DST_ALG_HMACSHA1: *n = ISC_SHA1_DIGESTLENGTH; break; case DST_ALG_HMACSHA224: *n = ISC_SHA224_DIGESTLENGTH; break; case DST_ALG_HMACSHA256: *n = ISC_SHA256_DIGESTLENGTH; break; case DST_ALG_HMACSHA384: *n = ISC_SHA384_DIGESTLENGTH; break; case DST_ALG_HMACSHA512: *n = ISC_SHA512_DIGESTLENGTH; break; case DST_ALG_GSSAPI: *n = 128; /*%< XXX */ break; case DST_ALG_DH: default: return (DST_R_UNSUPPORTEDALG); } return (ISC_R_SUCCESS); } isc_result_t dst_key_secretsize(const dst_key_t *key, unsigned int *n) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); REQUIRE(n != NULL); if (key->key_alg == DST_ALG_DH) *n = (key->key_size + 7) / 8; else return (DST_R_UNSUPPORTEDALG); return (ISC_R_SUCCESS); } /*** *** Static methods ***/ /*% * Allocates a key structure and fills in some of the fields. */ static dst_key_t * get_key_struct(dns_name_t *name, unsigned int alg, unsigned int flags, unsigned int protocol, unsigned int bits, dns_rdataclass_t rdclass, isc_mem_t *mctx) { dst_key_t *key; isc_result_t result; key = (dst_key_t *) isc_mem_get(mctx, sizeof(dst_key_t)); if (key == NULL) return (NULL); memset(key, 0, sizeof(dst_key_t)); key->magic = KEY_MAGIC; key->key_name = isc_mem_get(mctx, sizeof(dns_name_t)); if (key->key_name == NULL) { isc_mem_put(mctx, key, sizeof(dst_key_t)); return (NULL); } dns_name_init(key->key_name, NULL); result = dns_name_dup(name, mctx, key->key_name); if (result != ISC_R_SUCCESS) { isc_mem_put(mctx, key->key_name, sizeof(dns_name_t)); isc_mem_put(mctx, key, sizeof(dst_key_t)); return (NULL); } key->key_alg = alg; key->key_flags = flags; key->key_proto = protocol; key->mctx = mctx; key->opaque = NULL; key->key_size = bits; key->key_class = rdclass; key->func = dst_t_func[alg]; return (key); } /*% * Reads a public key from disk */ isc_result_t dst_key_read_public(const char *filename, int type, isc_mem_t *mctx, dst_key_t **keyp) { u_char rdatabuf[DST_KEY_MAXSIZE]; isc_buffer_t b; dns_fixedname_t name; isc_lex_t *lex = NULL; isc_token_t token; isc_result_t ret; dns_rdata_t rdata = DNS_RDATA_INIT; unsigned int opt = ISC_LEXOPT_DNSMULTILINE; dns_rdataclass_t rdclass = dns_rdataclass_in; isc_lexspecials_t specials; isc_uint32_t ttl; isc_result_t result; dns_rdatatype_t keytype; /* * Open the file and read its formatted contents * File format: * domain.name [ttl] [class] [KEY|DNSKEY] */ /* 1500 should be large enough for any key */ ret = isc_lex_create(mctx, 1500, &lex); if (ret != ISC_R_SUCCESS) goto cleanup; memset(specials, 0, sizeof(specials)); specials['('] = 1; specials[')'] = 1; specials['"'] = 1; isc_lex_setspecials(lex, specials); isc_lex_setcomments(lex, ISC_LEXCOMMENT_DNSMASTERFILE); ret = isc_lex_openfile(lex, filename); if (ret != ISC_R_SUCCESS) goto cleanup; #define NEXTTOKEN(lex, opt, token) { \ ret = isc_lex_gettoken(lex, opt, token); \ if (ret != ISC_R_SUCCESS) \ goto cleanup; \ } #define BADTOKEN() { \ ret = ISC_R_UNEXPECTEDTOKEN; \ goto cleanup; \ } /* Read the domain name */ NEXTTOKEN(lex, opt, &token); if (token.type != isc_tokentype_string) BADTOKEN(); dns_fixedname_init(&name); isc_buffer_init(&b, DST_AS_STR(token), strlen(DST_AS_STR(token))); isc_buffer_add(&b, strlen(DST_AS_STR(token))); ret = dns_name_fromtext(dns_fixedname_name(&name), &b, dns_rootname, ISC_FALSE, NULL); if (ret != ISC_R_SUCCESS) goto cleanup; /* Read the next word: either TTL, class, or 'KEY' */ NEXTTOKEN(lex, opt, &token); /* If it's a TTL, read the next one */ result = dns_ttl_fromtext(&token.value.as_textregion, &ttl); if (result == ISC_R_SUCCESS) NEXTTOKEN(lex, opt, &token); if (token.type != isc_tokentype_string) BADTOKEN(); ret = dns_rdataclass_fromtext(&rdclass, &token.value.as_textregion); if (ret == ISC_R_SUCCESS) NEXTTOKEN(lex, opt, &token); if (token.type != isc_tokentype_string) BADTOKEN(); if (strcasecmp(DST_AS_STR(token), "DNSKEY") == 0) keytype = dns_rdatatype_dnskey; else if (strcasecmp(DST_AS_STR(token), "KEY") == 0) keytype = dns_rdatatype_key; /*%< SIG(0), TKEY */ else BADTOKEN(); if (((type & DST_TYPE_KEY) != 0 && keytype != dns_rdatatype_key) || ((type & DST_TYPE_KEY) == 0 && keytype != dns_rdatatype_dnskey)) { ret = DST_R_BADKEYTYPE; goto cleanup; } isc_buffer_init(&b, rdatabuf, sizeof(rdatabuf)); ret = dns_rdata_fromtext(&rdata, rdclass, keytype, lex, NULL, ISC_FALSE, mctx, &b, NULL); if (ret != ISC_R_SUCCESS) goto cleanup; ret = dst_key_fromdns(dns_fixedname_name(&name), rdclass, &b, mctx, keyp); if (ret != ISC_R_SUCCESS) goto cleanup; cleanup: if (lex != NULL) isc_lex_destroy(&lex); return (ret); } static isc_boolean_t issymmetric(const dst_key_t *key) { REQUIRE(dst_initialized == ISC_TRUE); REQUIRE(VALID_KEY(key)); /* XXXVIX this switch statement is too sparse to gen a jump table. */ switch (key->key_alg) { case DST_ALG_RSAMD5: case DST_ALG_RSASHA1: case DST_ALG_DSA: case DST_ALG_DH: return (ISC_FALSE); case DST_ALG_HMACMD5: case DST_ALG_GSSAPI: return (ISC_TRUE); default: return (ISC_FALSE); } } /*% * Writes a public key to disk in DNS format. */ static isc_result_t write_public_key(const dst_key_t *key, int type, const char *directory) { FILE *fp; isc_buffer_t keyb, textb, fileb, classb; isc_region_t r; char filename[ISC_DIR_NAMEMAX]; unsigned char key_array[DST_KEY_MAXSIZE]; char text_array[DST_KEY_MAXTEXTSIZE]; char class_array[10]; isc_result_t ret; dns_rdata_t rdata = DNS_RDATA_INIT; isc_fsaccess_t access; REQUIRE(VALID_KEY(key)); isc_buffer_init(&keyb, key_array, sizeof(key_array)); isc_buffer_init(&textb, text_array, sizeof(text_array)); isc_buffer_init(&classb, class_array, sizeof(class_array)); ret = dst_key_todns(key, &keyb); if (ret != ISC_R_SUCCESS) return (ret); isc_buffer_usedregion(&keyb, &r); dns_rdata_fromregion(&rdata, key->key_class, dns_rdatatype_dnskey, &r); ret = dns_rdata_totext(&rdata, (dns_name_t *) NULL, &textb); if (ret != ISC_R_SUCCESS) return (DST_R_INVALIDPUBLICKEY); ret = dns_rdataclass_totext(key->key_class, &classb); if (ret != ISC_R_SUCCESS) return (DST_R_INVALIDPUBLICKEY); /* * Make the filename. */ isc_buffer_init(&fileb, filename, sizeof(filename)); ret = dst_key_buildfilename(key, DST_TYPE_PUBLIC, directory, &fileb); if (ret != ISC_R_SUCCESS) return (ret); /* * Create public key file. */ if ((fp = fopen(filename, "w")) == NULL) return (DST_R_WRITEERROR); if (issymmetric(key)) { access = 0; isc_fsaccess_add(ISC_FSACCESS_OWNER, ISC_FSACCESS_READ | ISC_FSACCESS_WRITE, &access); (void)isc_fsaccess_set(filename, access); } ret = dns_name_print(key->key_name, fp); if (ret != ISC_R_SUCCESS) { fclose(fp); return (ret); } fprintf(fp, " "); isc_buffer_usedregion(&classb, &r); fwrite(r.base, 1, r.length, fp); if ((type & DST_TYPE_KEY) != 0) fprintf(fp, " KEY "); else fprintf(fp, " DNSKEY "); isc_buffer_usedregion(&textb, &r); fwrite(r.base, 1, r.length, fp); fputc('\n', fp); fclose(fp); return (ISC_R_SUCCESS); } static isc_result_t buildfilename(dns_name_t *name, dns_keytag_t id, unsigned int alg, unsigned int type, const char *directory, isc_buffer_t *out) { const char *suffix = ""; unsigned int len; isc_result_t result; REQUIRE(out != NULL); if ((type & DST_TYPE_PRIVATE) != 0) suffix = ".private"; else if (type == DST_TYPE_PUBLIC) suffix = ".key"; if (directory != NULL) { if (isc_buffer_availablelength(out) < strlen(directory)) return (ISC_R_NOSPACE); isc_buffer_putstr(out, directory); if (strlen(directory) > 0U && directory[strlen(directory) - 1] != '/') isc_buffer_putstr(out, "/"); } if (isc_buffer_availablelength(out) < 1) return (ISC_R_NOSPACE); isc_buffer_putstr(out, "K"); result = dns_name_tofilenametext(name, ISC_FALSE, out); if (result != ISC_R_SUCCESS) return (result); len = 1 + 3 + 1 + 5 + strlen(suffix) + 1; if (isc_buffer_availablelength(out) < len) return (ISC_R_NOSPACE); snprintf((char *) isc_buffer_used(out), isc_buffer_availablelength(out), "+%03d+%05d%s", alg, id, suffix); isc_buffer_add(out, len); return (ISC_R_SUCCESS); } static isc_result_t computeid(dst_key_t *key) { isc_buffer_t dnsbuf; unsigned char dns_array[DST_KEY_MAXSIZE]; isc_region_t r; isc_result_t ret; isc_buffer_init(&dnsbuf, dns_array, sizeof(dns_array)); ret = dst_key_todns(key, &dnsbuf); if (ret != ISC_R_SUCCESS) return (ret); isc_buffer_usedregion(&dnsbuf, &r); key->key_id = dst_region_computeid(&r, key->key_alg); return (ISC_R_SUCCESS); } static isc_result_t frombuffer(dns_name_t *name, unsigned int alg, unsigned int flags, unsigned int protocol, dns_rdataclass_t rdclass, isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) { dst_key_t *key; isc_result_t ret; REQUIRE(dns_name_isabsolute(name)); REQUIRE(source != NULL); REQUIRE(mctx != NULL); REQUIRE(keyp != NULL && *keyp == NULL); key = get_key_struct(name, alg, flags, protocol, 0, rdclass, mctx); if (key == NULL) return (ISC_R_NOMEMORY); if (isc_buffer_remaininglength(source) > 0) { ret = algorithm_status(alg); if (ret != ISC_R_SUCCESS) { dst_key_free(&key); return (ret); } if (key->func->fromdns == NULL) { dst_key_free(&key); return (DST_R_UNSUPPORTEDALG); } ret = key->func->fromdns(key, source); if (ret != ISC_R_SUCCESS) { dst_key_free(&key); return (ret); } } *keyp = key; return (ISC_R_SUCCESS); } static isc_result_t algorithm_status(unsigned int alg) { REQUIRE(dst_initialized == ISC_TRUE); if (dst_algorithm_supported(alg)) return (ISC_R_SUCCESS); #ifndef OPENSSL if (alg == DST_ALG_RSAMD5 || alg == DST_ALG_RSASHA1 || alg == DST_ALG_DSA || alg == DST_ALG_DH || alg == DST_ALG_HMACMD5) return (DST_R_NOCRYPTO); #endif return (DST_R_UNSUPPORTEDALG); } static isc_result_t addsuffix(char *filename, unsigned int len, const char *ofilename, const char *suffix) { int olen = strlen(ofilename); int n; if (olen > 1 && ofilename[olen - 1] == '.') olen -= 1; else if (olen > 8 && strcmp(ofilename + olen - 8, ".private") == 0) olen -= 8; else if (olen > 4 && strcmp(ofilename + olen - 4, ".key") == 0) olen -= 4; n = snprintf(filename, len, "%.*s%s", olen, ofilename, suffix); if (n == -1) return (ISC_R_FAILURE); if ((unsigned int)n >= len) return (ISC_R_NOSPACE); return (ISC_R_SUCCESS); } isc_result_t dst__entropy_getdata(void *buf, unsigned int len, isc_boolean_t pseudo) { unsigned int flags = dst_entropy_flags; if (pseudo) flags &= ~ISC_ENTROPY_GOODONLY; return (isc_entropy_getdata(dst_entropy_pool, buf, len, NULL, flags)); }