diff options
Diffstat (limited to 'lib/dns/opensslrsa_link.c')
| -rw-r--r-- | lib/dns/opensslrsa_link.c | 629 |
1 files changed, 629 insertions, 0 deletions
diff --git a/lib/dns/opensslrsa_link.c b/lib/dns/opensslrsa_link.c new file mode 100644 index 0000000..2609df6 --- /dev/null +++ b/lib/dns/opensslrsa_link.c @@ -0,0 +1,629 @@ +/* + * Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2000-2003 Internet Software Consortium. + * + * 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 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 + * $Id: opensslrsa_link.c,v 1.1.6.11 2006/11/07 21:28:49 marka Exp $ + */ +#ifdef OPENSSL + +#include <config.h> + +#include <isc/entropy.h> +#include <isc/md5.h> +#include <isc/sha1.h> +#include <isc/mem.h> +#include <isc/string.h> +#include <isc/util.h> + +#include <dst/result.h> + +#include "dst_internal.h" +#include "dst_openssl.h" +#include "dst_parse.h" + +#include <openssl/err.h> +#include <openssl/objects.h> +#include <openssl/rsa.h> +#if OPENSSL_VERSION_NUMBER > 0x00908000L +#include <openssl/bn.h> +#endif + +/* + * We don't use configure for windows so enforce the OpenSSL version + * here. Unlike with configure we don't support overriding this test. + */ +#ifdef WIN32 +#if !((OPENSSL_VERSION_NUMBER >= 0x009070cfL && \ + OPENSSL_VERSION_NUMBER < 0x00908000L) || \ + OPENSSL_VERSION_NUMBER >= 0x0090804fL) +#error Please upgrade OpenSSL to 0.9.8d/0.9.7l or greater. +#endif +#endif + + + /* + * XXXMPA Temporarially disable RSA_BLINDING as it requires + * good quality random data that cannot currently be guarenteed. + * XXXMPA Find which versions of openssl use pseudo random data + * and set RSA_FLAG_BLINDING for those. + */ + +#if 0 +#if OPENSSL_VERSION_NUMBER < 0x0090601fL +#define SET_FLAGS(rsa) \ + do { \ + (rsa)->flags &= ~(RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE); \ + (rsa)->flags |= RSA_FLAG_BLINDING; \ + } while (0) +#else +#define SET_FLAGS(rsa) \ + do { \ + (rsa)->flags |= RSA_FLAG_BLINDING; \ + } while (0) +#endif +#endif + +#if OPENSSL_VERSION_NUMBER < 0x0090601fL +#define SET_FLAGS(rsa) \ + do { \ + (rsa)->flags &= ~(RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE); \ + (rsa)->flags &= ~RSA_FLAG_BLINDING; \ + } while (0) +#elif defined(RSA_FLAG_NO_BLINDING) +#define SET_FLAGS(rsa) \ + do { \ + (rsa)->flags &= ~RSA_FLAG_BLINDING; \ + (rsa)->flags |= RSA_FLAG_NO_BLINDING; \ + } while (0) +#else +#define SET_FLAGS(rsa) \ + do { \ + (rsa)->flags &= ~RSA_FLAG_BLINDING; \ + } while (0) +#endif + +static isc_result_t opensslrsa_todns(const dst_key_t *key, isc_buffer_t *data); + +static isc_result_t +opensslrsa_createctx(dst_key_t *key, dst_context_t *dctx) { + UNUSED(key); + REQUIRE(dctx->key->key_alg == DST_ALG_RSAMD5 || + dctx->key->key_alg == DST_ALG_RSASHA1); + + if (dctx->key->key_alg == DST_ALG_RSAMD5) { + isc_md5_t *md5ctx; + + md5ctx = isc_mem_get(dctx->mctx, sizeof(isc_md5_t)); + if (md5ctx == NULL) + return (ISC_R_NOMEMORY); + isc_md5_init(md5ctx); + dctx->opaque = md5ctx; + } else { + isc_sha1_t *sha1ctx; + + sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t)); + if (sha1ctx == NULL) + return (ISC_R_NOMEMORY); + isc_sha1_init(sha1ctx); + dctx->opaque = sha1ctx; + } + + return (ISC_R_SUCCESS); +} + +static void +opensslrsa_destroyctx(dst_context_t *dctx) { + REQUIRE(dctx->key->key_alg == DST_ALG_RSAMD5 || + dctx->key->key_alg == DST_ALG_RSASHA1); + + if (dctx->key->key_alg == DST_ALG_RSAMD5) { + isc_md5_t *md5ctx = dctx->opaque; + + if (md5ctx != NULL) { + isc_md5_invalidate(md5ctx); + isc_mem_put(dctx->mctx, md5ctx, sizeof(isc_md5_t)); + } + } else { + isc_sha1_t *sha1ctx = dctx->opaque; + + if (sha1ctx != NULL) { + isc_sha1_invalidate(sha1ctx); + isc_mem_put(dctx->mctx, sha1ctx, sizeof(isc_sha1_t)); + } + } + dctx->opaque = NULL; +} + +static isc_result_t +opensslrsa_adddata(dst_context_t *dctx, const isc_region_t *data) { + REQUIRE(dctx->key->key_alg == DST_ALG_RSAMD5 || + dctx->key->key_alg == DST_ALG_RSASHA1); + + if (dctx->key->key_alg == DST_ALG_RSAMD5) { + isc_md5_t *md5ctx = dctx->opaque; + isc_md5_update(md5ctx, data->base, data->length); + } else { + isc_sha1_t *sha1ctx = dctx->opaque; + isc_sha1_update(sha1ctx, data->base, data->length); + } + return (ISC_R_SUCCESS); +} + +static isc_result_t +opensslrsa_sign(dst_context_t *dctx, isc_buffer_t *sig) { + dst_key_t *key = dctx->key; + RSA *rsa = key->opaque; + isc_region_t r; + /* note: ISC_SHA1_DIGESTLENGTH > ISC_MD5_DIGESTLENGTH */ + unsigned char digest[ISC_SHA1_DIGESTLENGTH]; + unsigned int siglen = 0; + int status; + int type; + unsigned int digestlen; + char *message; + unsigned long err; + const char* file; + int line; + + REQUIRE(dctx->key->key_alg == DST_ALG_RSAMD5 || + dctx->key->key_alg == DST_ALG_RSASHA1); + + isc_buffer_availableregion(sig, &r); + + if (r.length < (unsigned int) RSA_size(rsa)) + return (ISC_R_NOSPACE); + + if (dctx->key->key_alg == DST_ALG_RSAMD5) { + isc_md5_t *md5ctx = dctx->opaque; + isc_md5_final(md5ctx, digest); + type = NID_md5; + digestlen = ISC_MD5_DIGESTLENGTH; + } else { + isc_sha1_t *sha1ctx = dctx->opaque; + isc_sha1_final(sha1ctx, digest); + type = NID_sha1; + digestlen = ISC_SHA1_DIGESTLENGTH; + } + + status = RSA_sign(type, digest, digestlen, r.base, &siglen, rsa); + if (status == 0) { + err = ERR_peek_error_line(&file, &line); + if (err != 0U) { + message = ERR_error_string(err, NULL); + fprintf(stderr, "%s:%s:%d\n", message, + file ? file : "", line); + } + return (dst__openssl_toresult(DST_R_OPENSSLFAILURE)); + } + + isc_buffer_add(sig, siglen); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +opensslrsa_verify(dst_context_t *dctx, const isc_region_t *sig) { + dst_key_t *key = dctx->key; + RSA *rsa = key->opaque; + /* note: ISC_SHA1_DIGESTLENGTH > ISC_MD5_DIGESTLENGTH */ + unsigned char digest[ISC_SHA1_DIGESTLENGTH]; + int status = 0; + int type; + unsigned int digestlen; + + REQUIRE(dctx->key->key_alg == DST_ALG_RSAMD5 || + dctx->key->key_alg == DST_ALG_RSASHA1); + + if (dctx->key->key_alg == DST_ALG_RSAMD5) { + isc_md5_t *md5ctx = dctx->opaque; + isc_md5_final(md5ctx, digest); + type = NID_md5; + digestlen = ISC_MD5_DIGESTLENGTH; + } else { + isc_sha1_t *sha1ctx = dctx->opaque; + isc_sha1_final(sha1ctx, digest); + type = NID_sha1; + digestlen = ISC_SHA1_DIGESTLENGTH; + } + + if (sig->length < (unsigned int) RSA_size(rsa)) + return (DST_R_VERIFYFAILURE); + + status = RSA_verify(type, digest, digestlen, sig->base, + RSA_size(rsa), rsa); + if (status == 0) + return (dst__openssl_toresult(DST_R_VERIFYFAILURE)); + + return (ISC_R_SUCCESS); +} + +static isc_boolean_t +opensslrsa_compare(const dst_key_t *key1, const dst_key_t *key2) { + int status; + RSA *rsa1, *rsa2; + + rsa1 = (RSA *) key1->opaque; + rsa2 = (RSA *) key2->opaque; + + if (rsa1 == NULL && rsa2 == NULL) + return (ISC_TRUE); + else if (rsa1 == NULL || rsa2 == NULL) + return (ISC_FALSE); + + status = BN_cmp(rsa1->n, rsa2->n) || + BN_cmp(rsa1->e, rsa2->e); + + if (status != 0) + return (ISC_FALSE); + + if (rsa1->d != NULL || rsa2->d != NULL) { + if (rsa1->d == NULL || rsa2->d == NULL) + return (ISC_FALSE); + status = BN_cmp(rsa1->d, rsa2->d) || + BN_cmp(rsa1->p, rsa2->p) || + BN_cmp(rsa1->q, rsa2->q); + + if (status != 0) + return (ISC_FALSE); + } + return (ISC_TRUE); +} + +static isc_result_t +opensslrsa_generate(dst_key_t *key, int exp) { +#if OPENSSL_VERSION_NUMBER > 0x00908000L + BN_GENCB cb; + RSA *rsa = RSA_new(); + BIGNUM *e = BN_new(); + + if (rsa == NULL || e == NULL) + goto err; + + if (exp == 0) { + /* RSA_F4 0x10001 */ + BN_set_bit(e, 0); + BN_set_bit(e, 16); + } else { + /* F5 0x100000001 */ + BN_set_bit(e, 0); + BN_set_bit(e, 32); + } + + BN_GENCB_set_old(&cb, NULL, NULL); + + if (RSA_generate_key_ex(rsa, key->key_size, e, &cb)) { + BN_free(e); + SET_FLAGS(rsa); + key->opaque = rsa; + return (ISC_R_SUCCESS); + } + +err: + if (e != NULL) + BN_free(e); + if (rsa != NULL) + RSA_free(rsa); + return (dst__openssl_toresult(DST_R_OPENSSLFAILURE)); +#else + RSA *rsa; + unsigned long e; + + if (exp == 0) + e = RSA_F4; + else + e = 0x40000003; + rsa = RSA_generate_key(key->key_size, e, NULL, NULL); + if (rsa == NULL) + return (dst__openssl_toresult(DST_R_OPENSSLFAILURE)); + SET_FLAGS(rsa); + key->opaque = rsa; + + return (ISC_R_SUCCESS); +#endif +} + +static isc_boolean_t +opensslrsa_isprivate(const dst_key_t *key) { + RSA *rsa = (RSA *) key->opaque; + return (ISC_TF(rsa != NULL && rsa->d != NULL)); +} + +static void +opensslrsa_destroy(dst_key_t *key) { + RSA *rsa = key->opaque; + RSA_free(rsa); + key->opaque = NULL; +} + + +static isc_result_t +opensslrsa_todns(const dst_key_t *key, isc_buffer_t *data) { + RSA *rsa; + isc_region_t r; + unsigned int e_bytes; + unsigned int mod_bytes; + + REQUIRE(key->opaque != NULL); + + rsa = (RSA *) key->opaque; + + isc_buffer_availableregion(data, &r); + + e_bytes = BN_num_bytes(rsa->e); + mod_bytes = BN_num_bytes(rsa->n); + + if (e_bytes < 256) { /*%< key exponent is <= 2040 bits */ + if (r.length < 1) + return (ISC_R_NOSPACE); + isc_buffer_putuint8(data, (isc_uint8_t) e_bytes); + } else { + if (r.length < 3) + return (ISC_R_NOSPACE); + isc_buffer_putuint8(data, 0); + isc_buffer_putuint16(data, (isc_uint16_t) e_bytes); + } + + if (r.length < e_bytes + mod_bytes) + return (ISC_R_NOSPACE); + isc_buffer_availableregion(data, &r); + + BN_bn2bin(rsa->e, r.base); + r.base += e_bytes; + BN_bn2bin(rsa->n, r.base); + + isc_buffer_add(data, e_bytes + mod_bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +opensslrsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + RSA *rsa; + isc_region_t r; + unsigned int e_bytes; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + rsa = RSA_new(); + if (rsa == NULL) + return (dst__openssl_toresult(ISC_R_NOMEMORY)); + SET_FLAGS(rsa); + + if (r.length < 1) { + RSA_free(rsa); + return (DST_R_INVALIDPUBLICKEY); + } + e_bytes = *r.base++; + r.length--; + + if (e_bytes == 0) { + if (r.length < 2) { + RSA_free(rsa); + return (DST_R_INVALIDPUBLICKEY); + } + e_bytes = ((*r.base++) << 8); + e_bytes += *r.base++; + r.length -= 2; + } + + if (r.length < e_bytes) { + RSA_free(rsa); + return (DST_R_INVALIDPUBLICKEY); + } + rsa->e = BN_bin2bn(r.base, e_bytes, NULL); + r.base += e_bytes; + r.length -= e_bytes; + + rsa->n = BN_bin2bn(r.base, r.length, NULL); + + key->key_size = BN_num_bits(rsa->n); + + isc_buffer_forward(data, r.length); + + key->opaque = (void *) rsa; + + return (ISC_R_SUCCESS); +} + + +static isc_result_t +opensslrsa_tofile(const dst_key_t *key, const char *directory) { + int i; + RSA *rsa; + dst_private_t priv; + unsigned char *bufs[8]; + isc_result_t result; + + if (key->opaque == NULL) + return (DST_R_NULLKEY); + + rsa = (RSA *) key->opaque; + + for (i = 0; i < 8; i++) { + bufs[i] = isc_mem_get(key->mctx, BN_num_bytes(rsa->n)); + if (bufs[i] == NULL) { + result = ISC_R_NOMEMORY; + goto fail; + } + } + + i = 0; + + priv.elements[i].tag = TAG_RSA_MODULUS; + priv.elements[i].length = BN_num_bytes(rsa->n); + BN_bn2bin(rsa->n, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_PUBLICEXPONENT; + priv.elements[i].length = BN_num_bytes(rsa->e); + BN_bn2bin(rsa->e, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_PRIVATEEXPONENT; + priv.elements[i].length = BN_num_bytes(rsa->d); + BN_bn2bin(rsa->d, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_PRIME1; + priv.elements[i].length = BN_num_bytes(rsa->p); + BN_bn2bin(rsa->p, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_PRIME2; + priv.elements[i].length = BN_num_bytes(rsa->q); + BN_bn2bin(rsa->q, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_EXPONENT1; + priv.elements[i].length = BN_num_bytes(rsa->dmp1); + BN_bn2bin(rsa->dmp1, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_EXPONENT2; + priv.elements[i].length = BN_num_bytes(rsa->dmq1); + BN_bn2bin(rsa->dmq1, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.elements[i].tag = TAG_RSA_COEFFICIENT; + priv.elements[i].length = BN_num_bytes(rsa->iqmp); + BN_bn2bin(rsa->iqmp, bufs[i]); + priv.elements[i].data = bufs[i]; + i++; + + priv.nelements = i; + result = dst__privstruct_writefile(key, &priv, directory); + fail: + for (i = 0; i < 8; i++) { + if (bufs[i] == NULL) + break; + isc_mem_put(key->mctx, bufs[i], BN_num_bytes(rsa->n)); + } + return (result); +} + +static isc_result_t +opensslrsa_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t ret; + int i; + RSA *rsa = NULL; + isc_mem_t *mctx = key->mctx; +#define DST_RET(a) {ret = a; goto err;} + + /* read private key file */ + ret = dst__privstruct_parse(key, DST_ALG_RSA, lexer, mctx, &priv); + if (ret != ISC_R_SUCCESS) + return (ret); + + rsa = RSA_new(); + if (rsa == NULL) + DST_RET(ISC_R_NOMEMORY); + SET_FLAGS(rsa); + key->opaque = rsa; + + for (i = 0; i < priv.nelements; i++) { + BIGNUM *bn; + bn = BN_bin2bn(priv.elements[i].data, + priv.elements[i].length, NULL); + if (bn == NULL) + DST_RET(ISC_R_NOMEMORY); + + switch (priv.elements[i].tag) { + case TAG_RSA_MODULUS: + rsa->n = bn; + break; + case TAG_RSA_PUBLICEXPONENT: + rsa->e = bn; + break; + case TAG_RSA_PRIVATEEXPONENT: + rsa->d = bn; + break; + case TAG_RSA_PRIME1: + rsa->p = bn; + break; + case TAG_RSA_PRIME2: + rsa->q = bn; + break; + case TAG_RSA_EXPONENT1: + rsa->dmp1 = bn; + break; + case TAG_RSA_EXPONENT2: + rsa->dmq1 = bn; + break; + case TAG_RSA_COEFFICIENT: + rsa->iqmp = bn; + break; + } + } + dst__privstruct_free(&priv, mctx); + + key->key_size = BN_num_bits(rsa->n); + + return (ISC_R_SUCCESS); + + err: + opensslrsa_destroy(key); + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (ret); +} + +static dst_func_t opensslrsa_functions = { + opensslrsa_createctx, + opensslrsa_destroyctx, + opensslrsa_adddata, + opensslrsa_sign, + opensslrsa_verify, + NULL, /*%< computesecret */ + opensslrsa_compare, + NULL, /*%< paramcompare */ + opensslrsa_generate, + opensslrsa_isprivate, + opensslrsa_destroy, + opensslrsa_todns, + opensslrsa_fromdns, + opensslrsa_tofile, + opensslrsa_parse, + NULL, /*%< cleanup */ +}; + +isc_result_t +dst__opensslrsa_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &opensslrsa_functions; + return (ISC_R_SUCCESS); +} + +#else /* OPENSSL */ + +#include <isc/util.h> + +EMPTY_TRANSLATION_UNIT + +#endif /* OPENSSL */ +/*! \file */ |
