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fix a potential buffer overflow when writing keys to disk.

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This commit is contained in:
Brian Wellington 2000-09-25 23:19:39 +00:00
parent cc8a68d56f
commit a06c40460a
1 changed files with 63 additions and 46 deletions
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109
lib/dns/sec/dst/opensslrsa_link.c
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@ -19,7 +19,7 @@
/* /*
* Principal Author: Brian Wellington * Principal Author: Brian Wellington
* $Id: opensslrsa_link.c,v 1.1 2000/09/16 01:12:21 bwelling Exp $ * $Id: opensslrsa_link.c,v 1.2 2000/09/25 23:19:39 bwelling Exp $
*/ */
#if defined(OPENSSL) #if defined(OPENSSL)
@ -340,70 +340,87 @@ opensslrsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
static isc_result_t static isc_result_t
opensslrsa_tofile(const dst_key_t *key, const char *directory) { opensslrsa_tofile(const dst_key_t *key, const char *directory) {
int cnt = 0; int i;
RSA *rsa; RSA *rsa;
dst_private_t priv; dst_private_t priv;
unsigned char bufs[8][128]; unsigned char *bufs[8];
isc_result_t result;
if (key->opaque == NULL) if (key->opaque == NULL)
return (DST_R_NULLKEY); return (DST_R_NULLKEY);
rsa = (RSA *) key->opaque; rsa = (RSA *) key->opaque;
priv.elements[cnt].tag = TAG_RSA_MODULUS; for (i = 0; i < 8; i++) {
priv.elements[cnt].length = BN_num_bytes(rsa->n); bufs[i] = isc_mem_get(key->mctx, BN_num_bytes(rsa->n));
BN_bn2bin(rsa->n, bufs[cnt]); if (bufs[i] == NULL) {
priv.elements[cnt].data = bufs[cnt]; result = ISC_R_NOMEMORY;
cnt++; goto fail;
}
}
priv.elements[cnt].tag = TAG_RSA_PUBLICEXPONENT; i = 0;
priv.elements[cnt].length = BN_num_bytes(rsa->e);
BN_bn2bin(rsa->e, bufs[cnt]);
priv.elements[cnt].data = bufs[cnt];
cnt++;
priv.elements[cnt].tag = TAG_RSA_PRIVATEEXPONENT; priv.elements[i].tag = TAG_RSA_MODULUS;
priv.elements[cnt].length = BN_num_bytes(rsa->d); priv.elements[i].length = BN_num_bytes(rsa->n);
BN_bn2bin(rsa->d, bufs[cnt]); BN_bn2bin(rsa->n, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.elements[cnt].tag = TAG_RSA_PRIME1; priv.elements[i].tag = TAG_RSA_PUBLICEXPONENT;
priv.elements[cnt].length = BN_num_bytes(rsa->p); priv.elements[i].length = BN_num_bytes(rsa->e);
BN_bn2bin(rsa->p, bufs[cnt]); BN_bn2bin(rsa->e, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.elements[cnt].tag = TAG_RSA_PRIME2; priv.elements[i].tag = TAG_RSA_PRIVATEEXPONENT;
priv.elements[cnt].length = BN_num_bytes(rsa->q); priv.elements[i].length = BN_num_bytes(rsa->d);
BN_bn2bin(rsa->q, bufs[cnt]); BN_bn2bin(rsa->d, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.elements[cnt].tag = TAG_RSA_EXPONENT1; priv.elements[i].tag = TAG_RSA_PRIME1;
priv.elements[cnt].length = BN_num_bytes(rsa->dmp1); priv.elements[i].length = BN_num_bytes(rsa->p);
BN_bn2bin(rsa->dmp1, bufs[cnt]); BN_bn2bin(rsa->p, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.elements[cnt].tag = TAG_RSA_EXPONENT2; priv.elements[i].tag = TAG_RSA_PRIME2;
priv.elements[cnt].length = BN_num_bytes(rsa->dmq1); priv.elements[i].length = BN_num_bytes(rsa->q);
BN_bn2bin(rsa->dmq1, bufs[cnt]); BN_bn2bin(rsa->q, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.elements[cnt].tag = TAG_RSA_COEFFICIENT; priv.elements[i].tag = TAG_RSA_EXPONENT1;
priv.elements[cnt].length = BN_num_bytes(rsa->iqmp); priv.elements[i].length = BN_num_bytes(rsa->dmp1);
BN_bn2bin(rsa->iqmp, bufs[cnt]); BN_bn2bin(rsa->dmp1, bufs[i]);
priv.elements[cnt].data = bufs[cnt]; priv.elements[i].data = bufs[i];
cnt++; i++;
priv.nelements = cnt; priv.elements[i].tag = TAG_RSA_EXPONENT2;
return (dst__privstruct_writefile(key, &priv, directory)); 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 static isc_result_t
opensslrsa_fromfile(dst_key_t *key, const isc_uint16_t id, const char *filename) opensslrsa_fromfile(dst_key_t *key, const isc_uint16_t id,
const char *filename)
{ {
dst_private_t priv; dst_private_t priv;
isc_result_t ret; isc_result_t ret;