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Differential D17276 Diff 48455 crypto/heimdal/kdc/kx509.c

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crypto/heimdal/kdc/kx509.c

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static const unsigned char version_2_0[4] = {0 , 0, 2, 0}; static const unsigned char version_2_0[4] = {0 , 0, 2, 0};
static krb5_error_code static krb5_error_code
verify_req_hash(krb5_context context, verify_req_hash(krb5_context context,
const Kx509Request *req, const Kx509Request *req,
krb5_keyblock *key) krb5_keyblock *key)
{ {
unsigned char digest[SHA_DIGEST_LENGTH]; unsigned char digest[SHA_DIGEST_LENGTH];
HMAC_CTX ctx; HMAC_CTX *ctx;
if (req->pk_hash.length != sizeof(digest)) { if (req->pk_hash.length != sizeof(digest)) {
krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED, krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED,
"pk-hash have wrong length: %lu", "pk-hash have wrong length: %lu",
(unsigned long)req->pk_hash.length); (unsigned long)req->pk_hash.length);
return KRB5KDC_ERR_PREAUTH_FAILED; return KRB5KDC_ERR_PREAUTH_FAILED;
} }
HMAC_CTX_init(&ctx); ctx = HMAC_CTX_new();
HMAC_Init_ex(&ctx, if (ctx == NULL) {
krb5_set_error_message(context, ENOMEM,
"HMAC context malloc failed");
return ENOMEM;
}
HMAC_Init_ex(ctx,
key->keyvalue.data, key->keyvalue.length, key->keyvalue.data, key->keyvalue.length,
EVP_sha1(), NULL); EVP_sha1(), NULL);
if (sizeof(digest) != HMAC_size(&ctx)) if (sizeof(digest) != HMAC_size(ctx))
krb5_abortx(context, "runtime error, hmac buffer wrong size in kx509"); krb5_abortx(context, "runtime error, hmac buffer wrong size in kx509");
HMAC_Update(&ctx, version_2_0, sizeof(version_2_0)); HMAC_Update(ctx, version_2_0, sizeof(version_2_0));
HMAC_Update(&ctx, req->pk_key.data, req->pk_key.length); HMAC_Update(ctx, req->pk_key.data, req->pk_key.length);
HMAC_Final(&ctx, digest, 0); HMAC_Final(ctx, digest, 0);
HMAC_CTX_cleanup(&ctx); HMAC_CTX_free(ctx);
if (memcmp(req->pk_hash.data, digest, sizeof(digest)) != 0) { if (memcmp(req->pk_hash.data, digest, sizeof(digest)) != 0) {
krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED, krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED,
"pk-hash is not correct"); "pk-hash is not correct");
return KRB5KDC_ERR_PREAUTH_FAILED; return KRB5KDC_ERR_PREAUTH_FAILED;
} }
return 0; return 0;
} }
static krb5_error_code static krb5_error_code
calculate_reply_hash(krb5_context context, calculate_reply_hash(krb5_context context,
krb5_keyblock *key, krb5_keyblock *key,
Kx509Response *rep) Kx509Response *rep)
{ {
krb5_error_code ret; krb5_error_code ret;
HMAC_CTX ctx; HMAC_CTX *ctx;
HMAC_CTX_init(&ctx); ctx = HMAC_CTX_new();
if (ctx == NULL) {
krb5_set_error_message(context, ENOMEM,
"HMAC context malloc failed");
return ENOMEM;
}
HMAC_Init_ex(&ctx, key->keyvalue.data, key->keyvalue.length, HMAC_Init_ex(ctx, key->keyvalue.data, key->keyvalue.length,
EVP_sha1(), NULL); EVP_sha1(), NULL);
ret = krb5_data_alloc(rep->hash, HMAC_size(&ctx)); ret = krb5_data_alloc(rep->hash, HMAC_size(ctx));
if (ret) { if (ret) {
HMAC_CTX_cleanup(&ctx); HMAC_CTX_free(ctx);
krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM; return ENOMEM;
} }
HMAC_Update(&ctx, version_2_0, sizeof(version_2_0)); HMAC_Update(ctx, version_2_0, sizeof(version_2_0));
if (rep->error_code) { if (rep->error_code) {
int32_t t = *rep->error_code; int32_t t = *rep->error_code;
do { do {
unsigned char p = (t & 0xff); unsigned char p = (t & 0xff);
HMAC_Update(&ctx, &p, 1); HMAC_Update(ctx, &p, 1);
t >>= 8; t >>= 8;
} while (t); } while (t);
} }
if (rep->certificate) if (rep->certificate)
HMAC_Update(&ctx, rep->certificate->data, rep->certificate->length); HMAC_Update(ctx, rep->certificate->data, rep->certificate->length);
if (rep->e_text) if (rep->e_text)
HMAC_Update(&ctx, (unsigned char *)*rep->e_text, strlen(*rep->e_text)); HMAC_Update(ctx, (unsigned char *)*rep->e_text, strlen(*rep->e_text));
HMAC_Final(&ctx, rep->hash->data, 0); HMAC_Final(ctx, rep->hash->data, 0);
HMAC_CTX_cleanup(&ctx); HMAC_CTX_free(ctx);
return 0; return 0;
} }
/* /*
* Build a certifate for `principal´ that will expire at `endtime´. * Build a certifate for `principal´ that will expire at `endtime´.
*/ */
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