opensslrsa_link.c revision 4f30395c97ad0586562a433fc6f1b9655fa6ba73
/*
* Copyright (C) 2000, 2001 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 INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM 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 1.17 2001/11/20 21:28:41 gson 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_parse.h"
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/rsa.h>
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));
isc_md5_init(md5ctx);
dctx->opaque = md5ctx;
} else {
isc_sha1_t *sha1ctx;
sha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_sha1_t));
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;
int status;
int type;
unsigned int digestlen;
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_clear_error();
return (DST_R_SIGNFAILURE);
}
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) {
ERR_clear_error();
return (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) {
RSA *rsa;
unsigned long e;
if (exp == 0)
e = RSA_3;
else
e = RSA_F4;
rsa = RSA_generate_key(key->key_size, e, NULL, NULL);
if (rsa == NULL) {
ERR_clear_error();
return (DST_R_OPENSSLFAILURE);
}
rsa->flags &= ~(RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE);
key->opaque = rsa;
return (ISC_R_SUCCESS);
}
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 (ISC_R_NOMEMORY);
rsa->flags &= ~(RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE);
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)
isc_mem_put(key->mctx, bufs[i], BN_num_bytes(rsa->n));
return (result);
}
static isc_result_t
opensslrsa_fromfile(dst_key_t *key, const char *filename) {
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_parsefile(key, DST_ALG_RSA, filename, mctx,
&priv);
if (ret != ISC_R_SUCCESS)
return (ret);
rsa = RSA_new();
if (rsa == NULL)
DST_RET(ISC_R_NOMEMORY);
rsa->flags &= ~(RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE);
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_fromfile,
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 */