/**Allocate memory for Elektra.
*
* Memory will be set to 0.
*
* @param size the requested size
* @see elektraMalloc
*/
void * elektraCalloc (size_t size)
{
ELEKTRA_ASSERT (size, "Size to allocate is zero (implementation defined behavior)");
void * ret = calloc (1, size);
ELEKTRA_ASSERT (ret, "Memory allocation failed with size %zu", size);
return ret;
}
/**
* @internal
*
* @brief Unescapes (a part of) a key name.
*
* As described in Syntax for Key Names, slashes are
* prefixed with a \\ (or uneven number thereof). This method removes all \\ that are such
* escape characters.
*
* The new string will be written to dest.
* May only need half the storage than the source string.
* It is not safe to use the same string for source and dest.
*
* @param source the source to read from
* @param size the number of bytes to process from source
* @param dest the destination to write to
*
* @return the destination pointer how far it was written to
*/
char * elektraUnescapeKeyNamePart (const char * source, size_t size, char * dest)
{
const char * sp = source;
char * dp = dest;
size_t count = 0;
ELEKTRA_ASSERT (sp != NULL && dp != NULL, "Got null pointer sp: %p dp: %p", (void *) sp, (void *) dp);
while (size)
{
if (*sp == '\\')
{
++count;
}
else if (*sp == '/')
{
// we escape a part, so there had to be a backslash
ELEKTRA_ASSERT (count > 0, "no backslash found, count is %zu", count);
ELEKTRA_ASSERT ((count % 2) == 1, "counted uneven number of backslashes: %zu", count);
count /= 2;
while (count)
{
*dp = '\\';
++dp;
--count;
}
*dp = *sp;
++dp;
}
else
{
// output delayed backslashes
while (count)
{
*dp = '\\';
++dp;
--count;
}
*dp = *sp;
++dp;
}
++sp;
--size;
}
ELEKTRA_ASSERT ((count % 2) == 0, "uneven number of backslashes: %zu", count);
count /= 2;
while (count)
{
*dp = '\\';
++dp;
--count;
}
return dp;
}
/**Copy string into new allocated memory.
*
* You need to free the memory yourself.
*
* @note that size is determined at runtime.
* So if you have a size information, don't use
* that function.
*
* @param s the null-terminated string to duplicate
*
* @ingroup internal
* @return 0 if out of memory, a pointer otherwise
* @pre s must be a c-string.
* @see elektraFree
* @see elektraStrLen
* @see elektraStrNDup
*/
char * elektraStrDup (const char * s)
{
void * tmp = 0;
size_t l = 0;
ELEKTRA_ASSERT (s, "Tried to duplicate null pointer");
l = elektraStrLen (s);
ELEKTRA_ASSERT (l, "Size of string to duplicate is zero");
tmp = elektraMalloc (l);
if (tmp) memcpy (tmp, s, l);
return tmp;
}
/**
* @internal
*
* @brief Write number backslashes to dest
*
* @param dest where to write to, will be updated to position after
* the written backslashes
* @param number of backslashes to write
*/
static void elektraWriteBackslashes (char ** dest, size_t number)
{
ELEKTRA_ASSERT (dest, "Got null pointer");
ELEKTRA_ASSERT (*dest, "Got null pointer (*dest)");
char * dp = *dest;
while (number)
{
*dp = '\\';
++dp;
--number;
}
*dest = dp;
}
/**
* @brief derive the cryptographic key and IV for a given (Elektra) Key k
* @param config KeySet holding the plugin/backend configuration
* @param errorKey holds an error description in case of failure
* @param masterKey holds the decrypted master password from the plugin configuration
* @param k the (Elektra)-Key to be encrypted
* @param cKey (Elektra)-Key holding the cryptographic material
* @param cIv (Elektra)-Key holding the initialization vector
* @retval -1 on failure. errorKey holds the error description.
* @retval 1 on success
*/
static int getKeyIvForDecryption (KeySet * config, Key * errorKey, Key * masterKey, Key * k, Key * cKey, Key * cIv)
{
gcry_error_t gcry_err;
kdb_octet_t keyBuffer[KEY_BUFFER_SIZE];
kdb_octet_t * saltBuffer = NULL;
kdb_unsigned_long_t saltBufferLen = 0;
ELEKTRA_ASSERT (masterKey != NULL, "Parameter `masterKey` must not be NULL");
// get the salt
if (CRYPTO_PLUGIN_FUNCTION (getSaltFromPayload) (errorKey, k, &saltBuffer, &saltBufferLen) != 1)
{
return -1; // error set by CRYPTO_PLUGIN_FUNCTION(getSaltFromPayload)()
}
// get the iteration count
const kdb_unsigned_long_t iterations = CRYPTO_PLUGIN_FUNCTION (getIterationCount) (errorKey, config);
// derive the cryptographic key and the IV
if ((gcry_err = gcry_kdf_derive (keyValue (masterKey), keyGetValueSize (masterKey), GCRY_KDF_PBKDF2, GCRY_MD_SHA512, saltBuffer,
saltBufferLen, iterations, KEY_BUFFER_SIZE, keyBuffer)))
{
ELEKTRA_SET_ERRORF (ELEKTRA_ERROR_CRYPTO_INTERNAL_ERROR, errorKey,
"Failed to restore the cryptographic key for decryption because: %s", gcry_strerror (gcry_err));
return -1;
}
keySetBinary (cKey, keyBuffer, ELEKTRA_CRYPTO_GCRY_KEYSIZE);
keySetBinary (cIv, keyBuffer + ELEKTRA_CRYPTO_GCRY_KEYSIZE, ELEKTRA_CRYPTO_GCRY_BLOCKSIZE);
return 1;
}
/**
* @brief derive the cryptographic key and IV for a given (Elektra) Key k
* @param config KeySet holding the plugin/backend configuration
* @param errorKey holds an error description in case of failure
* @param masterKey holds the decrypted master password from the plugin configuration
* @param k the (Elektra)-Key to be encrypted
* @param cKey (Elektra)-Key holding the cryptographic material
* @param cIv (Elektra)-Key holding the initialization vector
* @retval -1 on failure. errorKey holds the error description.
* @retval 1 on success
*/
static int getKeyIvForDecryption (KeySet * config, Key * errorKey, Key * masterKey, Key * k, Key * cKey, Key * cIv)
{
kdb_octet_t keyBuffer[KEY_BUFFER_SIZE];
kdb_octet_t * saltBuffer = NULL;
kdb_unsigned_long_t saltBufferLen = 0;
ELEKTRA_ASSERT (masterKey != NULL, "Parameter `masterKey` must not be NULL");
// get the salt
if (CRYPTO_PLUGIN_FUNCTION (getSaltFromPayload) (errorKey, k, &saltBuffer, &saltBufferLen) != 1)
{
return -1; // error set by CRYPTO_PLUGIN_FUNCTION(getSaltFromPayload)()
}
// get the iteration count
const kdb_unsigned_long_t iterations = CRYPTO_PLUGIN_FUNCTION (getIterationCount) (errorKey, config);
// derive the cryptographic key and the IV
pthread_mutex_lock (&mutex_ssl);
if (!PKCS5_PBKDF2_HMAC_SHA1 (keyValue (masterKey), keyGetValueSize (masterKey), saltBuffer, saltBufferLen, iterations,
KEY_BUFFER_SIZE, keyBuffer))
{
ELEKTRA_SET_ERRORF (ELEKTRA_ERROR_CRYPTO_INTERNAL_ERROR, errorKey,
"Failed to restore the cryptographic key for decryption. Libcrypto returned the error code: %lu",
ERR_get_error ());
pthread_mutex_unlock (&mutex_ssl);
return -1;
}
pthread_mutex_unlock (&mutex_ssl);
keySetBinary (cKey, keyBuffer, ELEKTRA_CRYPTO_SSL_KEYSIZE);
keySetBinary (cIv, keyBuffer + ELEKTRA_CRYPTO_SSL_KEYSIZE, ELEKTRA_CRYPTO_SSL_BLOCKSIZE);
return 1;
}
static resolverHandle * elektraGetResolverHandle (Plugin * handle, Key * parentKey)
{
resolverHandles * pks = elektraPluginGetData (handle);
ELEKTRA_ASSERT (pks != NULL, "Unable to retrieve plugin data for handle %p with parentKey %s", (void *) handle,
keyName (parentKey));
switch (keyGetNamespace (parentKey))
{
case KEY_NS_SPEC:
return &pks->spec;
case KEY_NS_DIR:
return &pks->dir;
case KEY_NS_USER:
return &pks->user;
case KEY_NS_SYSTEM:
return &pks->system;
case KEY_NS_PROC:
case KEY_NS_EMPTY:
case KEY_NS_NONE:
case KEY_NS_META:
case KEY_NS_CASCADING:
return 0;
}
return 0;
}
/**
* @internal
*
* @brief Unescapes a key name.
*
* Writes a null terminated sequence of key name parts to dest.
*
* May only need half the storage than the source string.
* It is not safe to use the same string for source and dest.
**/
size_t elektraUnescapeKeyName (const char * source, char * dest)
{
const char * sp = source;
char * dp = dest;
size_t size = 0;
ELEKTRA_ASSERT (sp != NULL && dp != NULL, "Got null pointer sp: %p dp: %p", (void *) sp, (void *) dp);
if (*sp == '/')
{
// handling for cascading names
*dp = 0;
++dp;
}
while (*(sp = keyNameGetOneLevel (sp + size, &size)))
{
if (!elektraUnescapeKeyNamePartBegin (sp, size, &dp))
{
dp = elektraUnescapeKeyNamePart (sp, size, dp);
}
*dp = 0;
++dp;
}
return dp - dest;
}
/**
* Calculates the length in bytes of a string.
*
* This function differs from strlen() because it is Unicode and multibyte
* chars safe. While strlen() counts characters and ignores the final NULL,
* elektraStrLen() count bytes including the ending NULL.
*
* It must not be used to search for / in the name, because it does not
* consider escaping. Instead use the unescaped name.
*
* @see keyUnescapedName()
*
* @ingroup internal
* @param s the string to get the length from
* @return number of bytes used by the string, including the final NULL.
* @ingroup internal
*/
size_t elektraStrLen (const char * s)
{
ELEKTRA_ASSERT (s, "Got null pointer");
char * found = strchr (s, 0);
if (found) return found - s + 1;
return 0;
}
/**
* @brief Builds together a format string by the plugin's configuration
*
* @param handle to plugin
* @param first format string for key
* @param second format string for value
*
* @return newly allocated format (to be freed with elektraFree);
*/
static char * getFormat (Plugin * handle, const char * first, const char * second)
{
char * format;
Key * key = ksLookupByName (elektraPluginGetConfig (handle), "/format", 0);
if (!key)
{
format = elektraStrDup ("%s = %s\n");
}
else
{
const size_t maxFactor = 2; // at maximum every char is a %, %% -> %%%%
const size_t newLineAtEnd = 2;
const size_t userFormatSize = keyGetValueSize (key);
format = elektraMalloc (userFormatSize * maxFactor + newLineAtEnd);
const char * userFormat = keyString (key);
int gotPercent = 0;
size_t j = 0;
for (size_t i = 0; i < userFormatSize; ++i, ++j)
{
const char c = userFormat[i];
if (gotPercent)
{
if (c == '%')
{
// escaped %% -> %%%%
format[j++] = '%';
format[j++] = '%';
format[j] = '%';
}
else
{
// single % -> %s
format[j++] = 's';
format[j] = c;
}
gotPercent = 0;
}
else if (c == '%')
{
format[j] = c;
gotPercent = 1;
}
else
{
format[j] = c;
}
}
--j; // discard null byte that is already there
ELEKTRA_ASSERT (format[j] == '\0', "should be null byte at end of string but was %c", format[j]);
format[j++] = '\n';
format[j] = '\0';
}
char * ret = elektraFormat (format, first, second);
elektraFree (format);
return ret;
}
/**
* Validates whether the supplied keyname is valid.
*
* The function looks for tangling escape characters in the end
* and for a minimum length.
*
* Does not check for valid namespaces
*
* @pre size must be at least 2
*
* @param name the key name that is to be checked
* @param size a elektraStrLen of the key name
* @retval true if the supplied keyname part is valid
* @retval false if its invalid
*/
int elektraValidateKeyName (const char * name, size_t size)
{
ELEKTRA_ASSERT (name, "Got null pointer");
ELEKTRA_ASSERT (size >= 2, "size too small %zu", size);
size_t escapeCount = 0;
size -= 2; // forward null character to last character
// now do backwards iteration
while (size && name[size] == '\\')
{
++escapeCount;
--size;
}
return (escapeCount % 2) == 0; // only allow equal number of escapes in the end
}
/**
* @brief Does string formatting in fresh allocated memory
*
* @param format as in printf()
* @param ... as in printf()
*
* @return new allocated memory (free with elektraFree)
*/
char * elektraFormat (const char * format, ...)
{
ELEKTRA_ASSERT (format, "Got null pointer");
va_list va;
va_start (va, format);
char * ret = elektraVFormat (format, va);
va_end (va);
return ret;
}
/**Copy buffer into new allocated memory.
*
* You need to free the memory yourself.
*
* This function also works with \\0 characters
* in the buffer. The length is taken as given,
* it must be correct.
*
* @return 0 if out of memory, a pointer otherwise
* @param s must be a allocated buffer
* @param l the length of s
* @ingroup internal
*/
char * elektraStrNDup (const char * s, size_t l)
{
void * tmp = 0;
ELEKTRA_ASSERT (l, "Size for string duplicate is zero");
tmp = elektraMalloc (l);
if (tmp) memcpy (tmp, s, l);
return tmp;
}
/**Reallocate Storage in a save way.
*
*@code
if (elektraRealloc ((void **) & buffer, new_length) < 0) {
// here comes the failure handler
// you can still use the old buffer
#if DEBUG
fprintf (stderr, "Reallocation error\n");
#endif
elektraFree (buffer);
buffer = 0;
// return with error
}
*@endcode
*
* @param buffer is a pointer to a elektraMalloc
* @param size is the new size for the memory
* @retval -1 on failure
* @retval 0 on success
* @ingroup internal
*/
int elektraRealloc (void ** buffer, size_t size)
{
ELEKTRA_ASSERT (size, "Size to allocate is zero (implementation defined behavior)");
void * ptr;
void * svr = *buffer;
ptr = realloc (*buffer, size);
ELEKTRA_ASSERT (ptr, "Memory (re)allocation failed with size %zu", size);
if (ptr == NULL)
{
*buffer = svr; /* restore old buffer*/
return -1;
}
else
{
*buffer = ptr;
return 0;
}
}
/**
* @brief Filter out keys not in the correct keyset
*
* @param split the split where to do it
* @param i for which split
* @param warningKey the key
* @param handle where to do backend lookups
*
* @retval -1 on error (no backend, wrong namespace)
* @retval 0 otherwise
*/
static int elektraSplitPostprocess (Split * split, int i, Key * warningKey, KDB * handle)
{
Key * cur = 0;
Backend * curHandle = 0;
ksRewind (split->keysets[i]);
while ((cur = ksNext (split->keysets[i])) != 0)
{
curHandle = elektraMountGetBackend (handle, cur);
if (!curHandle) return -1;
keyClearSync (cur);
if (curHandle != split->handles[i])
{
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it is hidden by other mountpoint");
}
else
switch (keyGetNamespace (cur))
{
case KEY_NS_SPEC:
if (!keyIsSpec (split->parents[i]))
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it is not spec");
break;
case KEY_NS_DIR:
if (!keyIsDir (split->parents[i]))
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it is not dir");
break;
case KEY_NS_USER:
if (!keyIsUser (split->parents[i]))
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it is not user");
break;
case KEY_NS_SYSTEM:
if (!keyIsSystem (split->parents[i]))
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it is not system");
break;
case KEY_NS_PROC:
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it has a proc key name");
break;
case KEY_NS_EMPTY:
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it has an empty name");
break;
case KEY_NS_META:
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it has a meta name");
break;
case KEY_NS_CASCADING:
elektraDropCurrentKey (split->keysets[i], warningKey, curHandle, "it has a cascading name");
break;
case KEY_NS_NONE:
ELEKTRA_ASSERT (0 && "wrong key namespace, should not be none");
return -1;
}
}
return 0;
}
/**
* @brief Does string formatting in fresh allocated memory
*
* @param format as in vprintf()
* @param arg_list as in vprintf()
*
* @return new allocated memory (free with elektraFree)
*/
char * elektraVFormat (const char * format, va_list arg_list)
{
ELEKTRA_ASSERT (format, "Got null pointer");
static int const default_size = 512;
char * buffer = elektraMalloc (default_size);
if (!buffer) return 0;
va_list arg_list_adj;
va_copy (arg_list_adj, arg_list);
int const calculated_length = vsnprintf (buffer, default_size, format, arg_list);
if (calculated_length == -1)
{
va_end (arg_list_adj);
elektraFree (buffer);
// before Glibc 2.0.6, always -1 is returned
// we won't do Glibc job, please upgrade
return 0;
}
if (calculated_length < default_size)
{
va_end (arg_list_adj);
// content was written successfully into
// default sized buffer
return buffer;
}
// String is longer than default_size.
// Allocate an intermediate buffer
// according to the calculated length from our last try
size_t const adjusted_buffer_size = calculated_length + 1;
elektraRealloc ((void **) &buffer, adjusted_buffer_size);
if (!buffer)
{
va_end (arg_list_adj);
return 0;
}
int const ret = vsnprintf (buffer, adjusted_buffer_size, format, arg_list_adj);
va_end (arg_list_adj);
if (ret == -1)
{
elektraFree (buffer);
return 0;
}
return buffer;
}
/**
* @see kdbnotificationinternal.h ::ElektraNotificationPluginRegisterCallback
*/
int elektraInternalnotificationRegisterCallback (Plugin * handle, Key * key, ElektraNotificationChangeCallback callback, void * context)
{
PluginState * pluginState = elektraPluginGetData (handle);
ELEKTRA_ASSERT (pluginState != NULL, "plugin state was not initialized properly");
KeyRegistration * registeredKey = elektraInternalnotificationAddNewRegistration (pluginState, key, callback, context, 0);
if (registeredKey == NULL)
{
return 0;
}
return 1;
}
/**
* @internal
*
* @brief Escapes character in the part of a key name.
*
* As described in Syntax for Key Names, special characters will be
* prefixed with a \\. No existing escaping is assumed. That means
* that even sequences that look like escapings will be escaped again.
* For example, \\/ will be escaped (or quoted) to \\\\\\/.
*
* The string will be written to dest.
*
* @note May need twice the storage than the source string.
* Do not use the source string as destination string.
*
* @param source the source pointer where escaping should start
* @param dest the destination to write to (twice the size as sp)
*
* @return pointer to destination
*/
char * elektraEscapeKeyNamePart (const char * source, char * dest)
{
if (elektraEscapeKeyNamePartBegin (source, dest))
{
return dest;
}
size_t count = 0;
const char * sp = source;
char * dp = dest;
ELEKTRA_ASSERT (sp != NULL && dp != NULL, "Got null pointer sp: %p dp: %p", (void *) sp, (void *) dp);
while (*sp)
{
if (*sp == '\\')
{
++count;
}
else if (*sp == '/')
{
// escape every slash
*dp = '\\';
++dp;
// and print escaped slashes
while (count)
{
*dp = '\\';
++dp;
--count;
}
}
else
{
count = 0;
}
*dp = *sp;
++dp;
++sp;
}
// print other escaped backslashes at end of part
while (count)
{
*dp = '\\';
++dp;
--count;
}
*dp = 0;
return dest;
}
/**
* @brief Remove one part of split.
*
* @param split the split object to work with
* @param where the position to cut away
*
* @pre where must be within the size of the split
* @post split will be removed
*
* @ingroup split
*/
void elektraSplitRemove (Split * split, size_t where)
{
ELEKTRA_ASSERT (where < split->size && "cannot remove behind size");
ksDel (split->keysets[where]);
keyDel (split->parents[where]);
--split->size; // reduce size
for (size_t i = where; i < split->size; ++i)
{
split->keysets[i] = split->keysets[i + 1];
split->handles[i] = split->handles[i + 1];
split->parents[i] = split->parents[i + 1];
split->syncbits[i] = split->syncbits[i + 1];
}
}
ssize_t elektraKeySetName(Key *key, const char *newName,
option_t options)
{
if (!key) return -1;
if (test_bit(key->flags, KEY_FLAG_RO_NAME)) return -1;
elektraRemoveKeyName(key);
if (!(options & KEY_META_NAME)) keySetOwner (key, NULL);
switch (keyGetNameNamespace(newName))
{
case KEY_NS_NONE: ELEKTRA_ASSERT(0);
case KEY_NS_EMPTY:
elektraFinalizeEmptyName(key);
return 0; // as documented
case KEY_NS_CASCADING: key->keyUSize=1;key->keySize=sizeof("/"); break;
case KEY_NS_SPEC: key->keyUSize=key->keySize=sizeof("spec"); break;
case KEY_NS_PROC: key->keyUSize=key->keySize=sizeof("proc"); break;
case KEY_NS_DIR: key->keyUSize=key->keySize=sizeof("dir"); break;
case KEY_NS_USER: elektraHandleUserName(key, newName); break;
case KEY_NS_SYSTEM: key->keyUSize=key->keySize=sizeof("system"); break;
case KEY_NS_META:
if (!(options & KEY_META_NAME)) return -1;
keyNameGetOneLevel(newName,&key->keySize);
key->keyUSize = ++ key->keySize; // for null
break;
} // Note that we abused keyUSize for cascading and user:owner
const size_t length = elektraStrLen(newName);
key->key=elektraMalloc(key->keySize*2);
memcpy(key->key, newName, key->keySize);
if (length == key->keyUSize || length == key->keySize)
{ // use || because full length is keyUSize in user, but keySize for /
// newName consisted of root only
elektraFinalizeName(key);
return key->keyUSize;
}
if (elektraOnlySlashes(newName+key->keyUSize-1))
{
elektraFinalizeName(key);
return key->keySize;
}
key->key[key->keySize-1] = '\0';
const ssize_t ret = keyAddName(key, newName+key->keyUSize);
if (ret == -1) elektraRemoveKeyName(key);
else return key->keySize;
return ret;
}
/**
* @brief Compare two memory regions but make cmp chars uppercase before
* comparison.
*
* @param s1 The first string to be compared
* @param s2 The second string to be compared
* @param size to be compared
*
* @ingroup internal
* @return a negative number if s1 is less than s2
* @retval 0 if s1 matches s2
* @return a positive number if s1 is greater than s2
*/
int elektraMemCaseCmp (const char * s1, const char * s2, size_t size)
{
size_t i;
ELEKTRA_ASSERT (s1 != NULL && s2 != NULL, "Got null pointer s1: %p s2: %p", (void *) s1, (void *) s2);
for (i = 0; i < size; i++)
{
const unsigned char cmp1 = s1[i];
const unsigned char cmp2 = s2[i];
const int CMP1 = toupper (cmp1);
const int CMP2 = toupper (cmp2);
const int diff = CMP1 - CMP2;
if (diff) return diff;
}
return 0;
}
/**
* @brief derive the cryptographic key and IV for a given (Elektra) Key k
* @param config KeySet holding the plugin/backend configuration
* @param errorKey holds an error description in case of failure
* @param masterKey holds the decrypted master password from the plugin configuration
* @param k the (Elektra)-Key to be encrypted
* @param cKey (Elektra)-Key holding the cryptographic material
* @param cIv (Elektra)-Key holding the initialization vector
* @retval -1 on failure. errorKey holds the error description.
* @retval 1 on success
*/
static int getKeyIvForEncryption (KeySet * config, Key * errorKey, Key * masterKey, Key * k, Key * cKey, Key * cIv)
{
kdb_octet_t salt[ELEKTRA_CRYPTO_DEFAULT_SALT_LEN] = { 0 };
kdb_octet_t keyBuffer[KEY_BUFFER_SIZE] = { 0 };
char * saltHexString = NULL;
ELEKTRA_ASSERT (masterKey != NULL, "Parameter `masterKey` must not be NULL");
// generate the salt
pthread_mutex_lock (&mutex_ssl);
if (!RAND_bytes (salt, ELEKTRA_CRYPTO_DEFAULT_SALT_LEN - 1))
{
ELEKTRA_SET_ERRORF (ELEKTRA_ERROR_CRYPTO_INTERNAL_ERROR, errorKey, "failed to generate random salt with error code %lu",
ERR_get_error ());
pthread_mutex_unlock (&mutex_ssl);
return -1;
}
pthread_mutex_unlock (&mutex_ssl);
saltHexString = ELEKTRA_PLUGIN_FUNCTION (ELEKTRA_PLUGIN_NAME_C, base64Encode) (salt, sizeof (salt));
if (!saltHexString)
{
ELEKTRA_SET_ERROR (87, errorKey, "Memory allocation failed");
return -1;
}
keySetMeta (k, ELEKTRA_CRYPTO_META_SALT, saltHexString);
elektraFree (saltHexString);
// read iteration count
const kdb_unsigned_long_t iterations = CRYPTO_PLUGIN_FUNCTION (getIterationCount) (errorKey, config);
// generate/derive the cryptographic key and the IV
pthread_mutex_lock (&mutex_ssl);
if (!PKCS5_PBKDF2_HMAC_SHA1 (keyValue (masterKey), keyGetValueSize (masterKey), salt, sizeof (salt), iterations, KEY_BUFFER_SIZE,
keyBuffer))
{
ELEKTRA_SET_ERRORF (ELEKTRA_ERROR_CRYPTO_INTERNAL_ERROR, errorKey,
"Failed to create a cryptographic key for encryption. Libcrypto returned error code: %lu",
ERR_get_error ());
pthread_mutex_unlock (&mutex_ssl);
return -1;
}
pthread_mutex_unlock (&mutex_ssl);
keySetBinary (cKey, keyBuffer, ELEKTRA_CRYPTO_SSL_KEYSIZE);
keySetBinary (cIv, keyBuffer + ELEKTRA_CRYPTO_SSL_KEYSIZE, ELEKTRA_CRYPTO_SSL_BLOCKSIZE);
return 1;
}
/**
* Copies the key array2 into where array1 points.
* It copies size elements.
*
* Overlapping is prohibited, use elektraMemmove() instead.
*
* @param array1 the destination
* @param array2 the source
* @param size how many pointer to Keys to copy
* @retval -1 on null pointers
* @retval 0 if nothing was done
* @return size how many keys were copied
*/
ssize_t elektraMemcpy (Key ** array1, Key ** array2, size_t size)
{
if (!array1) return -1;
if (!array2) return -1;
if (size > SSIZE_MAX) return -1;
if (size == 0) return 0;
#if DEBUG
char * a = (char *) array1;
char * b = (char *) array2;
for (size_t i = 0; i < size; i++)
{
ELEKTRA_ASSERT (a + i != b && b + i != a, "memcpy overlap: %p and %p with size %zu", (void *) a, (void *) b, size);
}
#endif
memcpy (array1, array2, size * sizeof (Key *));
return size;
}
/**
* @internal
*
* Escapes (a part of) a key name.
*/
int elektraEscapeKeyNamePartBegin (const char * source, char * dest)
{
const char * sp = source;
char * dp = dest;
ELEKTRA_ASSERT (sp != NULL && dp != NULL, "Got null pointer sp: %p dp: %p", (void *) sp, (void *) dp);
if (!strcmp ("", sp))
{
strcpy (dp, "%");
return 1;
}
size_t skippedBackslashes = 0;
// skip all backslashes at start of a name
while (*sp == '\\')
{
++sp;
++skippedBackslashes;
}
if (!strcmp ("%", sp))
{
elektraWriteBackslashes (&dp, skippedBackslashes);
strcpy (dp, "\\%");
return 1;
}
if (!strcmp (".", sp))
{
elektraWriteBackslashes (&dp, skippedBackslashes);
strcpy (dp, "\\.");
return 1;
}
if (!strcmp ("..", sp))
{
elektraWriteBackslashes (&dp, skippedBackslashes);
strcpy (dp, "\\..");
return 1;
}
return 0;
}
/**
* @internal
*
* @brief Check if an update is needed at all
*
* @retval -1 an error occurred
* @retval 0 no update needed
* @retval number of plugins which need update
*/
static int elektraGetCheckUpdateNeeded (Split * split, Key * parentKey)
{
int updateNeededOccurred = 0;
for (size_t i = 0; i < split->size; i++)
{
int ret = -1;
Backend * backend = split->handles[i];
clear_bit (split->syncbits[i], 1);
if (backend->getplugins[RESOLVER_PLUGIN] && backend->getplugins[RESOLVER_PLUGIN]->kdbGet)
{
ksRewind (split->keysets[i]);
keySetName (parentKey, keyName (split->parents[i]));
keySetString (parentKey, "");
ret = backend->getplugins[RESOLVER_PLUGIN]->kdbGet (backend->getplugins[RESOLVER_PLUGIN], split->keysets[i],
parentKey);
// store resolved filename
keySetString (split->parents[i], keyString (parentKey));
// no keys in that backend
backendUpdateSize (backend, split->parents[i], 0);
}
// TODO: set error in else case!
switch (ret)
{
case 1:
// Seems like we need to sync that
set_bit (split->syncbits[i], SPLIT_FLAG_SYNC);
++updateNeededOccurred;
break;
case 0:
// Nothing to do here
break;
default:
ELEKTRA_ASSERT (0, "resolver did not return 1 0 -1, but %d", ret);
case -1:
// Ohh, an error occurred, lets stop the
// process.
return -1;
}
}
return updateNeededOccurred;
}
/**
* @brief Allows one to Export Methods for a Plugin.
*
* This function must be called within ELEKTRA_PLUGIN_EXPORT.
* It define the plugin's methods that will be exported.
*
* All KDB methods implemented by the plugin basically could
* have random names (convention is elektraName*), except
* ELEKTRA_PLUGIN_EXPORT.
*
* This is the single symbol that will be looked up
* when loading the plugin, and the first method of the backend
* implementation that will be called.
*
* You need to use a macro so that both dynamic and static loading
* of the plugin works. For example for the doc plugin:
* @snippet doc.c export
*
* The first parameter is the name of the plugin.
* Then every plugin should have:
* @c ELEKTRA_PLUGIN_OPEN,
* @c ELEKTRA_PLUGIN_CLOSE,
* @c ELEKTRA_PLUGIN_GET,
* @c ELEKTRA_PLUGIN_SET and optionally
* @c ELEKTRA_PLUGIN_ERROR.
*
* The list is terminated with
* @c ELEKTRA_PLUGIN_END.
*
* You must use static "char arrays" in a read only segment.
* Don't allocate storage, it won't be freed.
*
* @param pluginName the name of this plugin
* @return an object that contains all plugin information needed by
* libelektra.so
* @ingroup plugin
*/
Plugin * elektraPluginExport (const char * pluginName, ...)
{
va_list va;
Plugin * returned;
plugin_t method = 0;
if (pluginName == 0) return 0;
returned = elektraCalloc (sizeof (struct _Plugin));
/* Start processing parameters */
va_start (va, pluginName);
returned->name = pluginName;
while ((method = va_arg (va, plugin_t)))
{
switch (method)
{
case ELEKTRA_PLUGIN_OPEN:
returned->kdbOpen = va_arg (va, kdbOpenPtr);
break;
case ELEKTRA_PLUGIN_CLOSE:
returned->kdbClose = va_arg (va, kdbClosePtr);
break;
case ELEKTRA_PLUGIN_GET:
returned->kdbGet = va_arg (va, kdbGetPtr);
break;
case ELEKTRA_PLUGIN_SET:
returned->kdbSet = va_arg (va, kdbSetPtr);
break;
case ELEKTRA_PLUGIN_ERROR:
returned->kdbError = va_arg (va, kdbErrorPtr);
break;
default:
ELEKTRA_ASSERT (0, "plugin passed something unexpected");
// fallthrough, will end here
case ELEKTRA_PLUGIN_END:
va_end (va);
return returned;
}
}
return returned;
}
/**
* @brief derive the cryptographic key and IV for a given (Elektra) Key k
* @param config KeySet holding the plugin/backend configuration
* @param errorKey holds an error description in case of failure
* @param masterKey holds the decrypted master password from the plugin configuration
* @param k the (Elektra)-Key to be encrypted
* @param cKey (Elektra)-Key holding the cryptographic material
* @param cIv (Elektra)-Key holding the initialization vector
* @retval -1 on failure. errorKey holds the error description.
* @retval 1 on success
*/
static int getKeyIvForEncryption (KeySet * config, Key * errorKey, Key * masterKey, Key * k, Key * cKey, Key * cIv)
{
gcry_error_t gcry_err;
kdb_octet_t salt[ELEKTRA_CRYPTO_DEFAULT_SALT_LEN];
kdb_octet_t keyBuffer[KEY_BUFFER_SIZE];
char * saltHexString = NULL;
ELEKTRA_ASSERT (masterKey != NULL, "Parameter `masterKey` must not be NULL");
// generate the salt
gcry_create_nonce (salt, sizeof (salt));
const int encodingResult = CRYPTO_PLUGIN_FUNCTION (base64Encode) (errorKey, salt, sizeof (salt), &saltHexString);
if (encodingResult < 0)
{
// error in libinvoke - errorKey has been set by base64Encode
return -1;
}
if (!saltHexString)
{
ELEKTRA_SET_ERROR (87, errorKey, "Memory allocation failed");
return -1;
}
keySetMeta (k, ELEKTRA_CRYPTO_META_SALT, saltHexString);
elektraFree (saltHexString);
// read iteration count
const kdb_unsigned_long_t iterations = CRYPTO_PLUGIN_FUNCTION (getIterationCount) (errorKey, config);
// generate/derive the cryptographic key and the IV
if ((gcry_err = gcry_kdf_derive (keyValue (masterKey), keyGetValueSize (masterKey), GCRY_KDF_PBKDF2, GCRY_MD_SHA512, salt,
sizeof (salt), iterations, KEY_BUFFER_SIZE, keyBuffer)))
{
ELEKTRA_SET_ERRORF (ELEKTRA_ERROR_CRYPTO_INTERNAL_ERROR, errorKey,
"Failed to create a cryptographic key for encryption because: %s", gcry_strerror (gcry_err));
return -1;
}
keySetBinary (cKey, keyBuffer, ELEKTRA_CRYPTO_GCRY_KEYSIZE);
keySetBinary (cIv, keyBuffer + ELEKTRA_CRYPTO_GCRY_KEYSIZE, ELEKTRA_CRYPTO_GCRY_BLOCKSIZE);
return 1;
}
static void elektraHandleUserName (Key * key, const char * newName)
{
const size_t userLength = sizeof ("user");
key->keyUSize = key->keySize = userLength;
const char delim = newName[userLength - 1];
// no owner, we are finished
if (delim == '/' || delim == '\0') return;
ELEKTRA_ASSERT (delim == ':');
// handle owner (compatibility, to be removed)
keyNameGetOneLevel (newName, &key->keyUSize);
const size_t ownerLength = key->keyUSize - userLength;
++key->keyUSize;
char * owner = elektraMalloc (ownerLength + 1);
if (!owner) return; // out of memory, ok for owner
strncpy (owner, newName + userLength, ownerLength);
owner[ownerLength] = 0;
keySetOwner (key, owner);
elektraFree (owner);
}
static resolverHandle * elektraGetResolverHandle (Plugin * handle, Key * parentKey)
{
resolverHandles * pks = elektraPluginGetData (handle);
switch (keyGetNamespace (parentKey))
{
case KEY_NS_SPEC:
return &pks->spec;
case KEY_NS_DIR:
return &pks->dir;
case KEY_NS_USER:
return &pks->user;
case KEY_NS_SYSTEM:
return &pks->system;
case KEY_NS_PROC:
case KEY_NS_EMPTY:
case KEY_NS_NONE:
case KEY_NS_META:
case KEY_NS_CASCADING:
break;
}
ELEKTRA_ASSERT (0, "namespace %d not valid for resolving", keyGetNamespace (parentKey));
return 0;
}
/**
* Updates all KeyRegistrations according to data from the given KeySet
* @internal
*
* @param plugin internal plugin handle
* @param keySet key set retrieved from hooks
* e.g. elektraInternalnotificationGet or elektraInternalnotificationSet)
*
*/
void elektraInternalnotificationUpdateRegisteredKeys (Plugin * plugin, KeySet * keySet)
{
PluginState * pluginState = elektraPluginGetData (plugin);
ELEKTRA_ASSERT (pluginState != NULL, "plugin state was not initialized properly");
KeyRegistration * registeredKey = pluginState->head;
while (registeredKey != NULL)
{
int changed = 0;
Key * key;
if (registeredKey->sameOrBelow)
{
Key * checkKey = keyNew (registeredKey->name, KEY_END);
if (keySetContainsSameOrBelow (checkKey, keySet))
{
changed = 1;
key = checkKey;
}
else
{
keyDel (checkKey);
}
}
else
{
key = ksLookupByName (keySet, registeredKey->name, 0);
if (key != NULL)
{
// Detect changes for string keys
if (!keyIsString (key))
{
// always notify for binary keys
changed = 1;
}
else
{
const char * currentValue = keyString (key);
changed = registeredKey->lastValue == NULL || strcmp (currentValue, registeredKey->lastValue) != 0;
if (changed)
{
// Save last value
char * buffer = elektraStrDup (currentValue);
if (buffer)
{
if (registeredKey->lastValue != NULL)
{
// Free previous value
elektraFree (registeredKey->lastValue);
}
registeredKey->lastValue = buffer;
}
}
}
}
}
if (changed)
{
ELEKTRA_LOG_DEBUG ("found changed registeredKey=%s with string value \"%s\". using context or variable=%p",
registeredKey->name, keyString (key), registeredKey->context);
// Invoke callback
ElektraNotificationChangeCallback callback = *(ElektraNotificationChangeCallback) registeredKey->callback;
callback (key, registeredKey->context);
if (registeredKey->sameOrBelow)
{
keyDel (key);
}
}
// proceed with next registered key
registeredKey = registeredKey->next;
}
}
