/**
* Decrypt the string given as per the current config.
*
* Returns APR_SUCCESS if successful.
*/
static apr_status_t decrypt_string(request_rec * r, const apr_crypto_t *f,
session_crypto_dir_conf *dconf, const char *in, char **out)
{
apr_status_t res;
apr_crypto_key_t *key = NULL;
apr_size_t ivSize = 0;
apr_crypto_block_t *block = NULL;
unsigned char *decrypted = NULL;
apr_size_t decryptedlen, tlen;
apr_size_t decodedlen;
char *decoded;
apr_size_t blockSize = 0;
apr_crypto_block_key_type_e *cipher;
int i = 0;
/* strip base64 from the string */
decoded = apr_palloc(r->pool, apr_base64_decode_len(in));
decodedlen = apr_base64_decode(decoded, in);
decoded[decodedlen] = '\0';
res = crypt_init(r, f, &cipher, dconf);
if (res != APR_SUCCESS) {
return res;
}
/* try each passphrase in turn */
for (; i < dconf->passphrases->nelts; i++) {
const char *passphrase = APR_ARRAY_IDX(dconf->passphrases, i, char *);
apr_size_t len = decodedlen;
char *slider = decoded;
/* encrypt using the first passphrase in the list */
res = apr_crypto_passphrase(&key, &ivSize, passphrase,
strlen(passphrase),
(unsigned char *)decoded, sizeof(apr_uuid_t),
*cipher, APR_MODE_CBC, 1, 4096, f, r->pool);
if (APR_STATUS_IS_ENOKEY(res)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01832)
"the passphrase '%s' was empty", passphrase);
continue;
}
else if (APR_STATUS_IS_EPADDING(res)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01833)
"padding is not supported for cipher");
continue;
}
else if (APR_STATUS_IS_EKEYTYPE(res)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01834)
"the key type is not known");
continue;
}
else if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01835)
"encryption could not be configured.");
continue;
}
/* sanity check - decoded too short? */
if (decodedlen < (sizeof(apr_uuid_t) + ivSize)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r, APLOGNO(01836)
"too short to decrypt, skipping");
res = APR_ECRYPT;
continue;
}
/* bypass the salt at the start of the decoded block */
slider += sizeof(apr_uuid_t);
len -= sizeof(apr_uuid_t);
res = apr_crypto_block_decrypt_init(&block, &blockSize, (unsigned char *)slider, key,
r->pool);
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01837)
"apr_crypto_block_decrypt_init failed");
continue;
}
/* bypass the iv at the start of the decoded block */
slider += ivSize;
len -= ivSize;
/* decrypt the given string */
res = apr_crypto_block_decrypt(&decrypted, &decryptedlen,
(unsigned char *)slider, len, block);
if (res) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01838)
"apr_crypto_block_decrypt failed");
continue;
}
*out = (char *) decrypted;
res = apr_crypto_block_decrypt_finish(decrypted + decryptedlen, &tlen, block);
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, res, r, APLOGNO(01839)
"apr_crypto_block_decrypt_finish failed");
continue;
}
decryptedlen += tlen;
decrypted[decryptedlen] = 0;
break;
}
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, res, r, APLOGNO(01840)
"decryption failed");
}
return res;
}
svn_error_t *
svn_crypto__verify_secret(svn_boolean_t *is_valid,
svn_crypto__ctx_t *ctx,
const svn_string_t *master,
const svn_string_t *ciphertext,
const svn_string_t *iv,
const svn_string_t *salt,
const char *checktext,
apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
svn_error_t *err = SVN_NO_ERROR;
apr_status_t apr_err;
apr_crypto_block_t *block_ctx = NULL;
apr_size_t block_size, iv_len;
apr_crypto_key_t *key = NULL;
unsigned char *result;
apr_size_t result_len = 0, final_len = 0;
svn_checksum_t *result_sum;
*is_valid = FALSE;
/* Initialize the passphrase. */
apr_err = apr_crypto_passphrase(&key, &iv_len,
master->data, master->len,
(unsigned char *)salt->data, salt->len,
APR_KEY_AES_256, APR_MODE_CBC,
FALSE /* doPad */, NUM_ITERATIONS,
ctx->crypto, scratch_pool);
if (apr_err != APR_SUCCESS)
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error creating derived key")));
if (! key)
return svn_error_create(APR_EGENERAL, NULL,
_("Error creating derived key"));
if (iv_len == 0)
return svn_error_create(APR_EGENERAL, NULL,
_("Unexpected IV length returned"));
if (iv_len != iv->len)
return svn_error_create(SVN_ERR_INCORRECT_PARAMS, NULL,
_("Provided IV has incorrect length"));
apr_err = apr_crypto_block_decrypt_init(&block_ctx, &block_size,
(unsigned char *)iv->data,
key, scratch_pool);
if ((apr_err != APR_SUCCESS) || (! block_ctx))
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error initializing block decryption")));
apr_err = apr_crypto_block_decrypt(NULL, &result_len,
(unsigned char *)ciphertext->data,
ciphertext->len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error fetching result length"));
goto cleanup;
}
result = apr_palloc(scratch_pool, result_len);
apr_err = apr_crypto_block_decrypt(&result, &result_len,
(unsigned char *)ciphertext->data,
ciphertext->len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error during block decryption"));
goto cleanup;
}
apr_err = apr_crypto_block_decrypt_finish(result + result_len, &final_len,
block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error finalizing block decryption"));
goto cleanup;
}
/* ### FIXME: This should be a SHA-256. */
SVN_ERR(svn_checksum(&result_sum, svn_checksum_sha1, result,
result_len + final_len, scratch_pool));
*is_valid = strcmp(checktext,
svn_checksum_to_cstring(result_sum, scratch_pool)) == 0;
cleanup:
apr_crypto_block_cleanup(block_ctx);
return err;
#else /* SVN_HAVE_CRYPTO */
*is_valid = FALSE;
return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
"Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}
static unsigned char *decrypt_block(abts_case *tc, apr_pool_t *pool,
const apr_crypto_driver_t *driver, const apr_crypto_t *f,
const apr_crypto_key_t *key, unsigned char *cipherText,
apr_size_t cipherTextLen, unsigned char **plainText,
apr_size_t *plainTextLen, const unsigned char *iv,
apr_size_t *blockSize, const char *description) {
apr_crypto_block_t *block = NULL;
const apu_err_t *result = NULL;
apr_size_t len = 0;
apr_status_t rv;
if (!driver || !f || !key || !cipherText) {
return NULL;
}
/* init the decryption */
rv = apr_crypto_block_decrypt_init(pool, f, key, iv, &block,
blockSize);
if (APR_ENOTIMPL == rv) {
ABTS_NOT_IMPL(tc, "apr_crypto_block_decrypt_init returned APR_ENOTIMPL");
} else {
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "decrypt_init: %s %s native error %d: %s (%s)\n",
description, apr_crypto_driver_name(driver), result->rc,
result->reason ? result->reason : "",
result->msg ? result->msg : "");
}
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_init returned APR_ENOKEY", rv != APR_ENOKEY);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_init returned APR_ENOIV", rv != APR_ENOIV);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_init returned APR_EKEYTYPE", rv != APR_EKEYTYPE);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_init returned APR_EKEYLENGTH", rv != APR_EKEYLENGTH);
ABTS_ASSERT(tc, "failed to apr_crypto_block_decrypt_init", rv == APR_SUCCESS);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_init returned NULL context", block != NULL);
}
if (!block || rv) {
return NULL;
}
/* decrypt the block */
rv = apr_crypto_block_decrypt(f, block, plainText, plainTextLen,
cipherText, cipherTextLen);
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "decrypt: %s %s native error %d: %s (%s)\n",
description, apr_crypto_driver_name(driver), result->rc,
result->reason ? result->reason : "",
result->msg ? result->msg : "");
}
ABTS_ASSERT(tc, "apr_crypto_block_decrypt returned APR_ECRYPT", rv != APR_ECRYPT);
ABTS_ASSERT(tc, "failed to apr_crypto_block_decrypt", rv == APR_SUCCESS);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt failed to allocate buffer", *plainText != NULL);
if (rv) {
return NULL;
}
/* finalise the decryption */
rv = apr_crypto_block_decrypt_finish(f, block, *plainText
+ *plainTextLen, &len);
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "decrypt_finish: %s %s native error %d: %s (%s)\n",
description, apr_crypto_driver_name(driver), result->rc,
result->reason ? result->reason : "",
result->msg ? result->msg : "");
}
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_finish returned APR_ECRYPT", rv != APR_ECRYPT);
ABTS_ASSERT(tc, "apr_crypto_block_decrypt_finish returned APR_EPADDING", rv != APR_EPADDING);
ABTS_ASSERT(tc, "failed to apr_crypto_block_decrypt_finish", rv == APR_SUCCESS);
if (rv) {
return NULL;
}
*plainTextLen += len;
apr_crypto_block_cleanup(f, block);
return *plainText;
}
svn_error_t *
svn_crypto__decrypt_password(const char **plaintext,
svn_crypto__ctx_t *ctx,
const svn_string_t *ciphertext,
const svn_string_t *iv,
const svn_string_t *salt,
const svn_string_t *master,
apr_pool_t *result_pool,
apr_pool_t *scratch_pool)
{
#ifdef SVN_HAVE_CRYPTO
svn_error_t *err = SVN_NO_ERROR;
apr_status_t apr_err;
apr_crypto_block_t *block_ctx = NULL;
apr_size_t block_size, iv_len;
apr_crypto_key_t *key = NULL;
unsigned char *result;
apr_size_t result_len = 0, final_len = 0;
/* Initialize the passphrase. */
apr_err = apr_crypto_passphrase(&key, &iv_len,
master->data, master->len,
(unsigned char *)salt->data, salt->len,
APR_KEY_AES_256, APR_MODE_CBC,
FALSE /* doPad */, NUM_ITERATIONS,
ctx->crypto, scratch_pool);
if (apr_err != APR_SUCCESS)
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error creating derived key")));
if (! key)
return svn_error_create(APR_EGENERAL, NULL,
_("Error creating derived key"));
if (iv_len == 0)
return svn_error_create(APR_EGENERAL, NULL,
_("Unexpected IV length returned"));
if (iv_len != iv->len)
return svn_error_create(SVN_ERR_INCORRECT_PARAMS, NULL,
_("Provided IV has incorrect length"));
apr_err = apr_crypto_block_decrypt_init(&block_ctx, &block_size,
(unsigned char *)iv->data,
key, scratch_pool);
if ((apr_err != APR_SUCCESS) || (! block_ctx))
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error initializing block decryption")));
apr_err = apr_crypto_block_decrypt(NULL, &result_len,
(unsigned char *)ciphertext->data,
ciphertext->len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error fetching result length"));
goto cleanup;
}
result = apr_palloc(scratch_pool, result_len);
apr_err = apr_crypto_block_decrypt(&result, &result_len,
(unsigned char *)ciphertext->data,
ciphertext->len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error during block decryption"));
goto cleanup;
}
apr_err = apr_crypto_block_decrypt_finish(result + result_len, &final_len,
block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error finalizing block decryption"));
goto cleanup;
}
/* Copy the non-random bits of the resulting plaintext, skipping the
prefix and ignoring any trailing padding. */
*plaintext = apr_pstrndup(result_pool,
(const char *)(result + RANDOM_PREFIX_LEN),
result_len + final_len - RANDOM_PREFIX_LEN);
cleanup:
apr_crypto_block_cleanup(block_ctx);
return err;
#else /* SVN_HAVE_CRYPTO */
return svn_error_create(SVN_ERR_UNSUPPORTED_FEATURE, NULL,
"Cryptographic support is not available");
#endif /* SVN_HAVE_CRYPTO */
}
