/**
* Encrypt the string given as per the current config.
*
* Returns APR_SUCCESS if successful.
*/
static apr_status_t encrypt_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 *encrypt = NULL;
unsigned char *combined = NULL;
apr_size_t encryptlen, tlen;
char *base64;
apr_size_t blockSize = 0;
const unsigned char *iv = NULL;
apr_uuid_t salt;
apr_crypto_block_key_type_e *cipher;
const char *passphrase;
/* by default, return an empty string */
*out = "";
/* don't attempt to encrypt an empty string, trying to do so causes a segfault */
if (!in || !*in) {
return APR_SUCCESS;
}
/* use a uuid as a salt value, and prepend it to our result */
apr_uuid_get(&salt);
res = crypt_init(r, f, &cipher, dconf);
if (res != APR_SUCCESS) {
return res;
}
/* encrypt using the first passphrase in the list */
passphrase = APR_ARRAY_IDX(dconf->passphrases, 0, char *);
res = apr_crypto_passphrase(&key, &ivSize, passphrase,
strlen(passphrase),
(unsigned char *) (&salt), 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_ERR, res, r, APLOGNO(01825)
"the passphrase '%s' was empty", passphrase);
}
if (APR_STATUS_IS_EPADDING(res)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01826)
"padding is not supported for cipher");
}
if (APR_STATUS_IS_EKEYTYPE(res)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01827)
"the key type is not known");
}
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01828)
"encryption could not be configured.");
return res;
}
res = apr_crypto_block_encrypt_init(&block, &iv, key, &blockSize, r->pool);
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01829)
"apr_crypto_block_encrypt_init failed");
return res;
}
/* encrypt the given string */
res = apr_crypto_block_encrypt(&encrypt, &encryptlen, (unsigned char *)in,
strlen(in), block);
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01830)
"apr_crypto_block_encrypt failed");
return res;
}
res = apr_crypto_block_encrypt_finish(encrypt + encryptlen, &tlen, block);
if (APR_SUCCESS != res) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, res, r, APLOGNO(01831)
"apr_crypto_block_encrypt_finish failed");
return res;
}
encryptlen += tlen;
/* prepend the salt and the iv to the result */
combined = apr_palloc(r->pool, ivSize + encryptlen + sizeof(apr_uuid_t));
memcpy(combined, &salt, sizeof(apr_uuid_t));
memcpy(combined + sizeof(apr_uuid_t), iv, ivSize);
memcpy(combined + sizeof(apr_uuid_t) + ivSize, encrypt, encryptlen);
/* base64 encode the result */
base64 = apr_palloc(r->pool, apr_base64_encode_len(ivSize + encryptlen +
sizeof(apr_uuid_t) + 1)
* sizeof(char));
apr_base64_encode(base64, (const char *) combined,
ivSize + encryptlen + sizeof(apr_uuid_t));
*out = base64;
return res;
}
svn_error_t *
svn_crypto__generate_secret_checktext(const svn_string_t **ciphertext,
const svn_string_t **iv,
const svn_string_t **salt,
const char **checktext,
svn_crypto__ctx_t *ctx,
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;
const unsigned char *salt_vector;
const unsigned char *iv_vector;
const unsigned char *stuff_vector;
apr_size_t iv_len;
apr_crypto_key_t *key = NULL;
apr_status_t apr_err;
apr_crypto_block_t *block_ctx = NULL;
apr_size_t block_size;
apr_size_t result_len;
unsigned char *result;
apr_size_t ignored_result_len = 0;
apr_size_t stuff_len;
svn_checksum_t *stuff_sum;
SVN_ERR_ASSERT(ctx != NULL);
/* Generate the salt. */
SVN_ERR(get_random_bytes(&salt_vector, ctx, SALT_LEN, result_pool));
/* Initialize the passphrase. */
apr_err = apr_crypto_passphrase(&key, &iv_len,
master->data, master->len,
salt_vector, 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"));
/* Generate the proper length IV. */
SVN_ERR(get_random_bytes(&iv_vector, ctx, iv_len, result_pool));
/* Initialize block encryption. */
apr_err = apr_crypto_block_encrypt_init(&block_ctx, &iv_vector, key,
&block_size, scratch_pool);
if ((apr_err != APR_SUCCESS) || (! block_ctx))
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error initializing block encryption")));
/* Generate a blob of random data, block-aligned per the
requirements of the encryption algorithm, but with a minimum size
of our choosing. */
#define MIN_STUFF_LEN 32
if (MIN_STUFF_LEN % block_size)
stuff_len = MIN_STUFF_LEN + (block_size - (MIN_STUFF_LEN % block_size));
else
stuff_len = MIN_STUFF_LEN;
SVN_ERR(get_random_bytes(&stuff_vector, ctx, stuff_len, scratch_pool));
/* ### FIXME: This should be a SHA-256. */
SVN_ERR(svn_checksum(&stuff_sum, svn_checksum_sha1, stuff_vector,
stuff_len, scratch_pool));
/* Get the length that we need to allocate. */
apr_err = apr_crypto_block_encrypt(NULL, &result_len, stuff_vector,
stuff_len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error fetching result length"));
goto cleanup;
}
/* Allocate our result buffer. */
result = apr_palloc(result_pool, result_len);
/* Encrypt the block. */
apr_err = apr_crypto_block_encrypt(&result, &result_len, stuff_vector,
stuff_len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error during block encryption"));
goto cleanup;
}
/* Finalize the block encryption. Since we padded everything, this should
not produce any more encrypted output. */
apr_err = apr_crypto_block_encrypt_finish(NULL,
&ignored_result_len,
block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error finalizing block encryption"));
goto cleanup;
}
*ciphertext = wrap_as_string(result, result_len, result_pool);
*iv = wrap_as_string(iv_vector, iv_len, result_pool);
*salt = wrap_as_string(salt_vector, SALT_LEN, result_pool);
*checktext = svn_checksum_to_cstring(stuff_sum, result_pool);
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 */
}
static unsigned char *encrypt_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, const unsigned char *in,
const apr_size_t inlen, unsigned char **cipherText,
apr_size_t *cipherTextLen, 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 || !in) {
return NULL;
}
/* init the encryption */
rv = apr_crypto_block_encrypt_init(pool, f, key, iv, &block,
blockSize);
if (APR_ENOTIMPL == rv) {
ABTS_NOT_IMPL(tc, "apr_crypto_block_encrypt_init returned APR_ENOTIMPL");
} else {
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "encrypt_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_encrypt_init returned APR_ENOKEY", rv != APR_ENOKEY);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt_init returned APR_ENOIV", rv != APR_ENOIV);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt_init returned APR_EKEYTYPE", rv != APR_EKEYTYPE);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt_init returned APR_EKEYLENGTH", rv != APR_EKEYLENGTH);
ABTS_ASSERT(tc, "failed to apr_crypto_block_encrypt_init", rv == APR_SUCCESS);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt_init returned NULL context", block != NULL);
}
if (!block || rv) {
return NULL;
}
/* encrypt the block */
rv = apr_crypto_block_encrypt(f, block, cipherText,
cipherTextLen, in, inlen);
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "encrypt: %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_encrypt returned APR_ECRYPT", rv != APR_ECRYPT);
ABTS_ASSERT(tc, "failed to apr_crypto_block_encrypt", rv == APR_SUCCESS);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt failed to allocate buffer", *cipherText != NULL);
if (rv) {
return NULL;
}
/* finalise the encryption */
rv = apr_crypto_block_encrypt_finish(f, block, *cipherText
+ *cipherTextLen, &len);
if (APR_SUCCESS != rv) {
apr_crypto_error(f, &result);
fprintf(stderr, "encrypt_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_encrypt_finish returned APR_ECRYPT", rv != APR_ECRYPT);
ABTS_ASSERT(tc, "apr_crypto_block_encrypt_finish returned APR_EPADDING", rv != APR_EPADDING);
ABTS_ASSERT(tc, "failed to apr_crypto_block_encrypt_finish", rv == APR_SUCCESS);
*cipherTextLen += len;
apr_crypto_block_cleanup(f, block);
if (rv) {
return NULL;
}
return *cipherText;
}
svn_error_t *
svn_crypto__encrypt_password(const svn_string_t **ciphertext,
const svn_string_t **iv,
const svn_string_t **salt,
svn_crypto__ctx_t *ctx,
const char *password,
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;
const unsigned char *salt_vector;
const unsigned char *iv_vector;
apr_size_t iv_len;
apr_crypto_key_t *key = NULL;
apr_status_t apr_err;
const unsigned char *prefix;
apr_crypto_block_t *block_ctx = NULL;
apr_size_t block_size;
unsigned char *assembled;
apr_size_t password_len, assembled_len = 0;
apr_size_t result_len;
unsigned char *result;
apr_size_t ignored_result_len = 0;
SVN_ERR_ASSERT(ctx != NULL);
/* Generate the salt. */
#define SALT_LEN 8
SVN_ERR(get_random_bytes(&salt_vector, ctx, SALT_LEN, result_pool));
/* Initialize the passphrase. */
apr_err = apr_crypto_passphrase(&key, &iv_len,
master->data, master->len,
salt_vector, 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"));
/* Generate the proper length IV. */
SVN_ERR(get_random_bytes(&iv_vector, ctx, iv_len, result_pool));
/* Initialize block encryption. */
apr_err = apr_crypto_block_encrypt_init(&block_ctx, &iv_vector, key,
&block_size, scratch_pool);
if ((apr_err != APR_SUCCESS) || (! block_ctx))
return svn_error_trace(crypto_error_create(
ctx, apr_err,
_("Error initializing block encryption")));
/* Generate a 4-byte prefix. */
SVN_ERR(get_random_bytes(&prefix, ctx, RANDOM_PREFIX_LEN, scratch_pool));
/* Combine our prefix, original password, and appropriate padding.
We won't bother padding if the prefix and password combined
perfectly align on the block boundary. If they don't,
however, we'll drop a NUL byte after the password and pad with
random stuff after that to the block boundary. */
password_len = strlen(password);
assembled_len = RANDOM_PREFIX_LEN + password_len;
if ((assembled_len % block_size) == 0)
{
assembled = apr_palloc(scratch_pool, assembled_len);
memcpy(assembled, prefix, RANDOM_PREFIX_LEN);
memcpy(assembled + RANDOM_PREFIX_LEN, password, password_len);
}
else
{
const unsigned char *padding;
apr_size_t pad_len = block_size - (assembled_len % block_size) - 1;
SVN_ERR(get_random_bytes(&padding, ctx, pad_len, scratch_pool));
assembled_len = assembled_len + 1 + pad_len;
assembled = apr_palloc(scratch_pool, assembled_len);
memcpy(assembled, prefix, RANDOM_PREFIX_LEN);
memcpy(assembled + RANDOM_PREFIX_LEN, password, password_len);
*(assembled + RANDOM_PREFIX_LEN + password_len) = '\0';
memcpy(assembled + RANDOM_PREFIX_LEN + password_len + 1,
padding, pad_len);
}
/* Get the length that we need to allocate. */
apr_err = apr_crypto_block_encrypt(NULL, &result_len, assembled,
assembled_len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error fetching result length"));
goto cleanup;
}
/* Allocate our result buffer. */
result = apr_palloc(result_pool, result_len);
/* Encrypt the block. */
apr_err = apr_crypto_block_encrypt(&result, &result_len, assembled,
assembled_len, block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error during block encryption"));
goto cleanup;
}
/* Finalize the block encryption. Since we padded everything, this should
not produce any more encrypted output. */
apr_err = apr_crypto_block_encrypt_finish(NULL,
&ignored_result_len,
block_ctx);
if (apr_err != APR_SUCCESS)
{
err = crypto_error_create(ctx, apr_err,
_("Error finalizing block encryption"));
goto cleanup;
}
*ciphertext = wrap_as_string(result, result_len, result_pool);
*iv = wrap_as_string(iv_vector, iv_len, result_pool);
*salt = wrap_as_string(salt_vector, SALT_LEN, result_pool);
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 */
}