/*
This file is part of GNUnet
- (C) 2003, 2004, 2005, 2006, 2007, 2008 Christian Grothoff (and other contributing authors)
+ (C) 2003, 2004, 2005, 2006, 2007, 2008, 2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
-
/**
* @file util/pseudonym.c
* @brief helper functions
* @author Christian Grothoff
+ *
+ * TODO:
+ * - all cryptographic operations are currently NOT implemented and
+ * provided by stubs that merely pretend to work!
*/
-
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_container_lib.h"
#include "gnunet_disk_lib.h"
#include "gnunet_pseudonym_lib.h"
+#include "gnunet_bio_lib.h"
+#include <gcrypt.h>
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+#define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
+
+#define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
+
+/**
+ * Log an error message at log-level 'level' that indicates
+ * a failure of the command 'cmd' with the message given
+ * by gcry_strerror(rc).
+ */
+#define LOG_GCRY(level, cmd, rc) do { LOG(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, gcry_strerror(rc)); } while(0);
+
+/**
+ * Name of the directory which stores meta data for pseudonym
+ */
+#define PS_METADATA_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonym" DIR_SEPARATOR_STR "metadata" DIR_SEPARATOR_STR
+
+/**
+ * Name of the directory which stores names for pseudonyms
+ */
+#define PS_NAMES_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonym" DIR_SEPARATOR_STR "names" DIR_SEPARATOR_STR
-#define PS_METADATA_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonyms/metadata" DIR_SEPARATOR_STR
-#define PS_NAMES_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonyms/names" DIR_SEPARATOR_STR
-struct DiscoveryCallback
+/**
+ * Configuration section we use.
+ */
+#define GNUNET_CLIENT_SERVICE_NAME "client"
+
+
+/* ************************* Disk operations (pseudonym data mgmt) **************** */
+
+/**
+ * Registered callbacks for discovery of pseudonyms.
+ */
+struct GNUNET_PSEUDONYM_DiscoveryHandle
{
- struct DiscoveryCallback *next;
+ /**
+ * This is a doubly linked list.
+ */
+ struct GNUNET_PSEUDONYM_DiscoveryHandle *next;
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct GNUNET_PSEUDONYM_DiscoveryHandle *prev;
+
+ /**
+ * Function to call each time a pseudonym is discovered.
+ */
GNUNET_PSEUDONYM_Iterator callback;
- void *closure;
+
+ /**
+ * Closure for callback.
+ */
+ void *callback_cls;
};
-static struct DiscoveryCallback *head;
+
+/**
+ * Head of the linked list of functions to call when
+ * new pseudonyms are added.
+ */
+static struct GNUNET_PSEUDONYM_DiscoveryHandle *disco_head;
+
+/**
+ * Tail of the linked list of functions to call when
+ * new pseudonyms are added.
+ */
+static struct GNUNET_PSEUDONYM_DiscoveryHandle *disco_tail;
+
/**
* Internal notification about new tracked URI.
+ *
+ * @param pseudonym public key of the pseudonym
+ * @param md meta data to be written
+ * @param rating rating of pseudonym
*/
static void
-internal_notify (const GNUNET_HashCode * id,
+internal_notify (const struct GNUNET_PseudonymIdentifier *pseudonym,
const struct GNUNET_CONTAINER_MetaData *md, int rating)
{
- struct DiscoveryCallback *pos;
+ struct GNUNET_PSEUDONYM_DiscoveryHandle *pos;
- pos = head;
- while (pos != NULL)
- {
- pos->callback (pos->closure, id, md, rating);
- pos = pos->next;
- }
+ for (pos = disco_head; NULL != pos; pos = pos->next)
+ pos->callback (pos->callback_cls, pseudonym, NULL, NULL, md, rating);
}
+
/**
* Register callback to be invoked whenever we discover
* a new pseudonym.
+ * Will immediately call provided iterator callback for all
+ * already discovered pseudonyms.
+ *
+ * @param cfg configuration to use
+ * @param iterator iterator over pseudonym
+ * @param iterator_cls point to a closure
+ * @return registration handle
*/
-int
-GNUNET_PSEUDONYM_discovery_callback_register (struct
- GNUNET_CONFIGURATION_Handle
- *cfg,
- GNUNET_PSEUDONYM_Iterator
- iterator, void *closure)
+struct GNUNET_PSEUDONYM_DiscoveryHandle *
+GNUNET_PSEUDONYM_discovery_callback_register (const struct
+ GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_PSEUDONYM_Iterator iterator,
+ void *iterator_cls)
{
- struct DiscoveryCallback *list;
-
- list = GNUNET_malloc (sizeof (struct DiscoveryCallback));
- list->callback = iterator;
- list->closure = closure;
- list->next = head;
- head = list;
- GNUNET_PSEUDONYM_list_all (cfg, iterator, closure);
- return GNUNET_OK;
+ struct GNUNET_PSEUDONYM_DiscoveryHandle *dh;
+
+ dh = GNUNET_malloc (sizeof (struct GNUNET_PSEUDONYM_DiscoveryHandle));
+ dh->callback = iterator;
+ dh->callback_cls = iterator_cls;
+ GNUNET_CONTAINER_DLL_insert (disco_head, disco_tail, dh);
+ GNUNET_PSEUDONYM_list_all (cfg, iterator, iterator_cls);
+ return dh;
}
+
/**
* Unregister pseudonym discovery callback.
+ *
+ * @param dh registration to unregister
*/
-int
-GNUNET_PSEUDONYM_discovery_callback_unregister (GNUNET_PSEUDONYM_Iterator
- iterator, void *closure)
+void
+GNUNET_PSEUDONYM_discovery_callback_unregister (struct GNUNET_PSEUDONYM_DiscoveryHandle *dh)
{
- struct DiscoveryCallback *prev;
- struct DiscoveryCallback *pos;
-
- prev = NULL;
- pos = head;
- while ((pos != NULL) &&
- ((pos->callback != iterator) || (pos->closure != closure)))
- {
- prev = pos;
- pos = pos->next;
- }
- if (pos == NULL)
- return GNUNET_SYSERR;
- if (prev == NULL)
- head = pos->next;
- else
- prev->next = pos->next;
- GNUNET_free (pos);
- return GNUNET_OK;
+ GNUNET_CONTAINER_DLL_remove (disco_head, disco_tail, dh);
+ GNUNET_free (dh);
}
/**
* Get the filename (or directory name) for the given
* pseudonym identifier and directory prefix.
+ *
+ * @param cfg configuration to use
+ * @param prefix path components to append to the private directory name
+ * @param pseudonym the pseudonym, can be NULL
+ * @return filename of the pseudonym (if pseudonym != NULL) or directory with the data (if pseudonym == NULL)
*/
static char *
-get_data_filename (struct GNUNET_CONFIGURATION_Handle
- *cfg, const char *prefix, const GNUNET_HashCode * psid)
+get_data_filename (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const char *prefix,
+ const struct GNUNET_PseudonymIdentifier *pseudonym)
{
struct GNUNET_CRYPTO_HashAsciiEncoded enc;
+ struct GNUNET_HashCode psid;
- if (psid != NULL)
- GNUNET_CRYPTO_hash_to_enc (psid, &enc);
- return GNUNET_DISK_get_home_filename (cfg,
- GNUNET_CLIENT_SERVICE_NAME,
- prefix,
- (psid ==
- NULL) ? NULL : (const char *) &enc,
+ if (NULL != pseudonym)
+ {
+ GNUNET_CRYPTO_hash (pseudonym,
+ sizeof (struct GNUNET_PseudonymIdentifier),
+ &psid);
+ GNUNET_CRYPTO_hash_to_enc (&psid, &enc);
+ }
+ return GNUNET_DISK_get_home_filename (cfg,
+ GNUNET_CLIENT_SERVICE_NAME, prefix,
+ (NULL == pseudonym)
+ ? NULL
+ : (const char *) &enc,
NULL);
}
-static void
-write_pseudonym_info (struct GNUNET_CONFIGURATION_Handle *cfg,
- const GNUNET_HashCode * nsid,
- const struct GNUNET_CONTAINER_MetaData *meta,
- int32_t ranking, const char *ns_name)
+
+/**
+ * Get the filename (or directory name) for the given
+ * hash code and directory prefix.
+ *
+ * @param cfg configuration to use
+ * @param prefix path components to append to the private directory name
+ * @param hc some hash code
+ * @return filename of the pseudonym (if hc != NULL) or directory with the data (if hc == NULL)
+ */
+static char *
+get_data_filename_hash (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const char *prefix,
+ const struct GNUNET_HashCode *hc)
+{
+ struct GNUNET_CRYPTO_HashAsciiEncoded enc;
+
+ if (NULL != hc)
+ GNUNET_CRYPTO_hash_to_enc (hc, &enc);
+ return GNUNET_DISK_get_home_filename (cfg,
+ GNUNET_CLIENT_SERVICE_NAME, prefix,
+ (NULL == hc)
+ ? NULL
+ : (const char *) &enc,
+ NULL);
+}
+
+
+/**
+ * Set the pseudonym metadata, rank and name.
+ * Writes the pseudonym infomation into a file
+ *
+ * @param cfg overall configuration
+ * @param pseudonym id of the pseudonym
+ * @param name name to set. Must be the non-unique version of it.
+ * May be NULL, in which case it erases pseudonym's name!
+ * @param md metadata to set
+ * May be NULL, in which case it erases pseudonym's metadata!
+ * @param rank rank to assign
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int
+GNUNET_PSEUDONYM_set_info (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
+ const char *name,
+ const struct GNUNET_CONTAINER_MetaData *md,
+ int32_t rank)
{
- unsigned int size;
- unsigned int tag;
- unsigned int off;
- char *buf;
char *fn;
+ struct GNUNET_BIO_WriteHandle *fileW;
- fn = get_data_filename (cfg, PS_METADATA_DIR, nsid);
- GNUNET_assert (fn != NULL);
- size = GNUNET_CONTAINER_meta_data_get_serialized_size (meta,
- GNUNET_CONTAINER_META_DATA_SERIALIZE_FULL);
- tag = size + sizeof (int) + 1;
- off = 0;
- if (ns_name != NULL)
- {
- off = strlen (ns_name);
- tag += off;
- }
- buf = GNUNET_malloc (tag);
- ((int *) buf)[0] = htonl (ranking); /* ranking */
- if (ns_name != NULL)
- {
- memcpy (&buf[sizeof (int)], ns_name, off + 1);
- }
- else
- {
- buf[sizeof (int)] = '\0';
- }
- GNUNET_assert
- (size == GNUNET_CONTAINER_meta_data_serialize (meta,
- &buf[sizeof
- (int) +
- off + 1],
- size,
- GNUNET_CONTAINER_META_DATA_SERIALIZE_FULL));
- GNUNET_DISK_fn_write (fn, buf, tag, GNUNET_DISK_PERM_USER_READ
- | GNUNET_DISK_PERM_USER_WRITE | GNUNET_DISK_PERM_GROUP_READ);
+ fn = get_data_filename (cfg, PS_METADATA_DIR, pseudonym);
+ if (NULL == (fileW = GNUNET_BIO_write_open (fn)))
+ {
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ if ((GNUNET_OK != GNUNET_BIO_write (fileW, pseudonym,
+ sizeof (struct GNUNET_PseudonymIdentifier))) ||
+ (GNUNET_OK != GNUNET_BIO_write_int32 (fileW, rank)) ||
+ (GNUNET_OK != GNUNET_BIO_write_string (fileW, name)) ||
+ (GNUNET_OK != GNUNET_BIO_write_meta_data (fileW, md)))
+ {
+ (void) GNUNET_BIO_write_close (fileW);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fn));
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK != GNUNET_BIO_write_close (fileW))
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fn));
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
GNUNET_free (fn);
- GNUNET_free (buf);
/* create entry for pseudonym name in names */
- GNUNET_free_non_null (GNUNET_PSEUDONYM_id_to_name (cfg, nsid));
+ if (NULL != name)
+ GNUNET_free_non_null (GNUNET_PSEUDONYM_name_uniquify (cfg, pseudonym,
+ name, NULL));
+ return GNUNET_OK;
}
+
+/**
+ * Read pseudonym infomation from a file
+ *
+ * @param cfg configuration to use
+ * @param pseudonym hash code of a pseudonym
+ * @param meta meta data to be read from a file
+ * @param rank rank of a pseudonym
+ * @param ns_name name of a pseudonym
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
static int
-read_info (struct GNUNET_CONFIGURATION_Handle *cfg,
- const GNUNET_HashCode * nsid,
+read_info (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
struct GNUNET_CONTAINER_MetaData **meta,
- int32_t * ranking, char **ns_name)
+ int32_t *rank,
+ char **ns_name)
{
- unsigned long long len;
- unsigned int size;
- unsigned int zend;
- struct stat sbuf;
- char *buf;
+ struct GNUNET_PseudonymIdentifier pd;
char *fn;
+ char *emsg;
+ struct GNUNET_BIO_ReadHandle *fileR;
- if (meta != NULL)
+ fn = get_data_filename (cfg, PS_METADATA_DIR, pseudonym);
+ if (GNUNET_YES !=
+ GNUNET_DISK_file_test (fn))
+ {
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ if (NULL == (fileR = GNUNET_BIO_read_open (fn)))
+ {
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ emsg = NULL;
+ *ns_name = NULL;
+ if ( (GNUNET_OK != GNUNET_BIO_read (fileR, "pseudonym", &pd, sizeof (pd))) ||
+ (0 != memcmp (&pd, pseudonym, sizeof (pd))) ||
+ (GNUNET_OK != GNUNET_BIO_read_int32 (fileR, rank)) ||
+ (GNUNET_OK !=
+ GNUNET_BIO_read_string (fileR, "Read string error!", ns_name, 200)) ||
+ (GNUNET_OK !=
+ GNUNET_BIO_read_meta_data (fileR, "Read meta data error!", meta)) )
+ {
+ (void) GNUNET_BIO_read_close (fileR, &emsg);
+ GNUNET_free_non_null (emsg);
+ GNUNET_free_non_null (*ns_name);
+ *ns_name = NULL;
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fn));
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK != GNUNET_BIO_read_close (fileR, &emsg))
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to parse metadata about pseudonym from file `%s': %s\n"), fn,
+ emsg);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fn));
+ GNUNET_CONTAINER_meta_data_destroy (*meta);
*meta = NULL;
- if (ns_name != NULL)
+ GNUNET_free_non_null (*ns_name);
*ns_name = NULL;
- fn = get_data_filename (cfg, PS_METADATA_DIR, nsid);
- GNUNET_assert (fn != NULL);
-
- if ((0 != STAT (fn, &sbuf))
- || (GNUNET_OK != GNUNET_DISK_file_size (fn, &len, GNUNET_YES)))
- {
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- if (len <= sizeof (int) + 1)
- {
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- if (len > 16 * 1024 * 1024)
- {
- /* too big, must be invalid! remove! */
- GNUNET_break (0);
- if (0 != UNLINK (fn))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink", fn);
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- buf = GNUNET_malloc (len);
- if (len != GNUNET_DISK_fn_read (fn, buf, len))
- {
- GNUNET_free (buf);
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- if (ranking != NULL)
- *ranking = ntohl (((int *) buf)[0]);
- zend = sizeof (int);
- while ((zend < len) && (buf[zend] != '\0'))
- zend++;
- if (zend == len)
- {
- GNUNET_free (buf);
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- if (ns_name != NULL)
- {
- if (zend != sizeof (int))
- *ns_name = GNUNET_strdup (&buf[sizeof (int)]);
- else
- *ns_name = NULL;
- }
- zend++;
- size = len - zend;
- if (meta != NULL)
- {
- *meta = GNUNET_CONTAINER_meta_data_deserialize (&buf[zend], size);
- if ((*meta) == NULL)
- {
- /* invalid data! remove! */
- GNUNET_break (0);
- if (0 != UNLINK (fn))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
- "unlink", fn);
- GNUNET_free (buf);
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- }
+ GNUNET_free_non_null (emsg);
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
GNUNET_free (fn);
- GNUNET_free (buf);
return GNUNET_OK;
}
-
/**
- * Return the unique, human readable name for the given namespace.
+ * Return unique variant of the namespace name. Use it after
+ * GNUNET_PSEUDONYM_get_info() to make sure that name is unique.
*
- * @return NULL on failure (should never happen)
+ * @param cfg configuration
+ * @param pseudonym public key of the pseudonym
+ * @param name name to uniquify
+ * @param suffix if not NULL, filled with the suffix value
+ * @return NULL on failure (should never happen), name on success.
+ * Free the name with GNUNET_free().
*/
char *
-GNUNET_PSEUDONYM_id_to_name (struct GNUNET_CONFIGURATION_Handle *cfg,
- const GNUNET_HashCode * nsid)
+GNUNET_PSEUDONYM_name_uniquify (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
+ const char *name,
+ unsigned int *suffix)
{
- struct GNUNET_CONTAINER_MetaData *meta;
- char *name;
- GNUNET_HashCode nh;
+ struct GNUNET_HashCode nh;
+ struct GNUNET_PseudonymIdentifier pi;
+ uint64_t len;
char *fn;
- unsigned long long len;
- struct GNUNET_IO_Handle *fh;
+ struct GNUNET_DISK_FileHandle *fh;
unsigned int i;
unsigned int idx;
char *ret;
struct stat sbuf;
- meta = NULL;
- name = NULL;
- if (GNUNET_OK == read_info (cfg, nsid, &meta, NULL, &name))
- {
- if ((meta != NULL) && (name == NULL))
- name = GNUNET_CONTAINER_meta_data_get_first_by_types (meta,
- EXTRACTOR_TITLE,
- EXTRACTOR_FILENAME,
- EXTRACTOR_DESCRIPTION,
- EXTRACTOR_SUBJECT,
- EXTRACTOR_PUBLISHER,
- EXTRACTOR_AUTHOR,
- EXTRACTOR_COMMENT,
- EXTRACTOR_SUMMARY,
- EXTRACTOR_OWNER,
- -1);
- if (meta != NULL)
- {
- GNUNET_CONTAINER_meta_data_destroy (meta);
- meta = NULL;
- }
- }
- if (name == NULL)
- name = GNUNET_strdup (_("no-name"));
GNUNET_CRYPTO_hash (name, strlen (name), &nh);
- fn = get_data_filename (cfg, PS_NAMES_DIR, &nh);
- GNUNET_assert (fn != NULL);
-
+ fn = get_data_filename_hash (cfg, PS_NAMES_DIR, &nh);
len = 0;
if (0 == STAT (fn, &sbuf))
- GNUNET_DISK_file_size (fn, &len, GNUNET_YES);
- fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_CREATE
- | GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_PERM_USER_READ
- | GNUNET_DISK_PERM_USER_WRITE);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_size (fn, &len, GNUNET_YES, GNUNET_YES));
+ fh = GNUNET_DISK_file_open (fn,
+ GNUNET_DISK_OPEN_CREATE |
+ GNUNET_DISK_OPEN_READWRITE,
+ GNUNET_DISK_PERM_USER_READ |
+ GNUNET_DISK_PERM_USER_WRITE);
i = 0;
idx = -1;
- while ((len >= sizeof (GNUNET_HashCode)) &&
- (sizeof (GNUNET_HashCode)
- == GNUNET_DISK_file_read (fh, &nh, sizeof (GNUNET_HashCode))))
- {
- if (0 == memcmp (&nh, nsid, sizeof (GNUNET_HashCode)))
- {
- idx = i;
- break;
- }
- i++;
- len -= sizeof (GNUNET_HashCode);
- }
- if (idx == -1)
+ while ((len >= sizeof (struct GNUNET_PseudonymIdentifier)) &&
+ (sizeof (struct GNUNET_PseudonymIdentifier) ==
+ GNUNET_DISK_file_read (fh, &pi, sizeof (struct GNUNET_PseudonymIdentifier))))
+ {
+ if (0 == memcmp (&pi, pseudonym, sizeof (struct GNUNET_PseudonymIdentifier)))
{
idx = i;
- if (sizeof (GNUNET_HashCode) !=
- GNUNET_DISK_file_write (fh, nsid, sizeof (GNUNET_HashCode)))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
+ break;
}
- GNUNET_DISK_file_close (&fh);
+ i++;
+ len -= sizeof (struct GNUNET_HashCode);
+ }
+ if (-1 == idx)
+ {
+ idx = i;
+ if (sizeof (struct GNUNET_PseudonymIdentifier) !=
+ GNUNET_DISK_file_write (fh, pseudonym, sizeof (struct GNUNET_PseudonymIdentifier)))
+ LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "write", fn);
+ }
+ GNUNET_DISK_file_close (fh);
ret = GNUNET_malloc (strlen (name) + 32);
GNUNET_snprintf (ret, strlen (name) + 32, "%s-%u", name, idx);
- GNUNET_free (name);
+ if (suffix != NULL)
+ *suffix = idx;
GNUNET_free (fn);
return ret;
}
+
+/**
+ * Get namespace name, metadata and rank
+ * This is a wrapper around internal read_info() call, and ensures that
+ * returned data is not invalid (not NULL).
+ *
+ * @param cfg configuration
+ * @param pseudonym public key of the pseudonym
+ * @param ret_meta a location to store metadata pointer. NULL, if metadata
+ * is not needed. Destroy with GNUNET_CONTAINER_meta_data_destroy().
+ * @param ret_rank a location to store rank. NULL, if rank not needed.
+ * @param ret_name a location to store human-readable name. Name is not unique.
+ * NULL, if name is not needed. Free with GNUNET_free().
+ * @param name_is_a_dup is set to GNUNET_YES, if ret_name was filled with
+ * a duplicate of a "no-name" placeholder
+ * @return GNUNET_OK on success. GNUENT_SYSERR if the data was
+ * unobtainable (in that case ret_* are filled with placeholders -
+ * empty metadata container, rank -1 and a "no-name" name).
+ */
+int
+GNUNET_PSEUDONYM_get_info (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
+ struct GNUNET_CONTAINER_MetaData **ret_meta,
+ int32_t *ret_rank,
+ char **ret_name,
+ int *name_is_a_dup)
+{
+ struct GNUNET_CONTAINER_MetaData *meta;
+ char *name;
+ int32_t rank = -1;
+
+ meta = NULL;
+ name = NULL;
+ if (GNUNET_OK == read_info (cfg, pseudonym, &meta, &rank, &name))
+ {
+ if ((meta != NULL) && (name == NULL))
+ name =
+ GNUNET_CONTAINER_meta_data_get_first_by_types (meta,
+ EXTRACTOR_METATYPE_TITLE,
+ EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME,
+ EXTRACTOR_METATYPE_FILENAME,
+ EXTRACTOR_METATYPE_DESCRIPTION,
+ EXTRACTOR_METATYPE_SUBJECT,
+ EXTRACTOR_METATYPE_PUBLISHER,
+ EXTRACTOR_METATYPE_AUTHOR_NAME,
+ EXTRACTOR_METATYPE_COMMENT,
+ EXTRACTOR_METATYPE_SUMMARY,
+ -1);
+ if (ret_name != NULL)
+ {
+ if (name == NULL)
+ {
+ name = GNUNET_strdup (_("no-name"));
+ if (name_is_a_dup != NULL)
+ *name_is_a_dup = GNUNET_YES;
+ }
+ else if (name_is_a_dup != NULL)
+ *name_is_a_dup = GNUNET_NO;
+ *ret_name = name;
+ }
+ else if (name != NULL)
+ GNUNET_free (name);
+
+ if (ret_meta != NULL)
+ {
+ if (meta == NULL)
+ meta = GNUNET_CONTAINER_meta_data_create ();
+ *ret_meta = meta;
+ }
+ else if (meta != NULL)
+ GNUNET_CONTAINER_meta_data_destroy (meta);
+
+ if (ret_rank != NULL)
+ *ret_rank = rank;
+
+ return GNUNET_OK;
+ }
+ if (ret_name != NULL)
+ *ret_name = GNUNET_strdup (_("no-name"));
+ if (ret_meta != NULL)
+ *ret_meta = GNUNET_CONTAINER_meta_data_create ();
+ if (ret_rank != NULL)
+ *ret_rank = -1;
+ if (name_is_a_dup != NULL)
+ *name_is_a_dup = GNUNET_YES;
+ return GNUNET_SYSERR;
+}
+
+
/**
* Get the namespace ID belonging to the given namespace name.
*
- * @return GNUNET_OK on success
+ * @param cfg configuration to use
+ * @param ns_uname unique (!) human-readable name for the namespace
+ * @param pseudonym set to public key of pseudonym based on 'ns_uname'
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
*/
int
-GNUNET_PSEUDONYM_name_to_id (struct GNUNET_CONFIGURATION_Handle *cfg,
- const char *ns_uname, GNUNET_HashCode * nsid)
+GNUNET_PSEUDONYM_name_to_id (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const char *ns_uname,
+ struct GNUNET_PseudonymIdentifier *pseudonym)
{
size_t slen;
- unsigned long long len;
+ uint64_t len;
unsigned int idx;
char *name;
- GNUNET_HashCode nh;
+ struct GNUNET_HashCode nh;
char *fn;
- struct GNUNET_IO_Handle *fh;
+ struct GNUNET_DISK_FileHandle *fh;
idx = -1;
slen = strlen (ns_uname);
- while ((slen > 0) && (1 != sscanf (&ns_uname[slen - 1], "-%u", &idx)))
+ while ((slen > 0) && (1 != SSCANF (&ns_uname[slen - 1], "-%u", &idx)))
slen--;
- if (slen == 0)
+ if (0 == slen)
return GNUNET_SYSERR;
name = GNUNET_strdup (ns_uname);
name[slen - 1] = '\0';
+
GNUNET_CRYPTO_hash (name, strlen (name), &nh);
GNUNET_free (name);
- fn = get_data_filename (cfg, PS_NAMES_DIR, &nh);
- GNUNET_assert (fn != NULL);
+ fn = get_data_filename_hash (cfg, PS_NAMES_DIR, &nh);
if ((GNUNET_OK != GNUNET_DISK_file_test (fn) ||
- (GNUNET_OK != GNUNET_DISK_file_size (fn, &len, GNUNET_YES))) ||
- ((idx + 1) * sizeof (GNUNET_HashCode) > len))
- {
- GNUNET_free (fn);
- return GNUNET_SYSERR;
- }
- fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_CREATE
- | GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_PERM_USER_READ
- | GNUNET_DISK_PERM_USER_WRITE);
+ (GNUNET_OK != GNUNET_DISK_file_size (fn, &len, GNUNET_YES, GNUNET_YES))) ||
+ ((idx + 1) * sizeof (struct GNUNET_PseudonymIdentifier) > len))
+ {
+ GNUNET_free (fn);
+ return GNUNET_SYSERR;
+ }
+ fh = GNUNET_DISK_file_open (fn,
+ GNUNET_DISK_OPEN_CREATE |
+ GNUNET_DISK_OPEN_READWRITE,
+ GNUNET_DISK_PERM_USER_READ |
+ GNUNET_DISK_PERM_USER_WRITE);
GNUNET_free (fn);
- GNUNET_DISK_file_seek (fh, idx * sizeof (GNUNET_HashCode), GNUNET_SEEK_SET);
- if (sizeof (GNUNET_HashCode) != GNUNET_DISK_file_read (fh, nsid, sizeof (GNUNET_HashCode)))
- {
- GNUNET_DISK_file_close (&fh);
- return GNUNET_SYSERR;
- }
- GNUNET_DISK_file_close (&fh);
+ if (GNUNET_SYSERR ==
+ GNUNET_DISK_file_seek (fh, idx * sizeof (struct GNUNET_PseudonymIdentifier),
+ GNUNET_DISK_SEEK_SET))
+ {
+ GNUNET_DISK_file_close (fh);
+ return GNUNET_SYSERR;
+ }
+ if (sizeof (struct GNUNET_PseudonymIdentifier) !=
+ GNUNET_DISK_file_read (fh, pseudonym, sizeof (struct GNUNET_PseudonymIdentifier)))
+ {
+ GNUNET_DISK_file_close (fh);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_DISK_file_close (fh);
return GNUNET_OK;
}
-
+/**
+ * struct used to list the pseudonym
+ */
struct ListPseudonymClosure
{
+
+ /**
+ * iterator over pseudonym
+ */
GNUNET_PSEUDONYM_Iterator iterator;
- void *closure;
- struct GNUNET_CONFIGURATION_Handle *cfg;
+
+ /**
+ * Closure for iterator.
+ */
+ void *iterator_cls;
+
+ /**
+ * Configuration to use.
+ */
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
};
+
+
+/**
+ * Helper function to list all available pseudonyms
+ *
+ * @param cls point to a struct ListPseudonymClosure
+ * @param fullname name of pseudonym
+ */
static int
list_pseudonym_helper (void *cls, const char *fullname)
{
- struct ListPseudonymClosure *c = cls;
- int ret;
- GNUNET_HashCode id;
- int rating;
+ struct ListPseudonymClosure *lpc = cls;
+ struct GNUNET_PseudonymIdentifier pd;
+ char *emsg;
+ struct GNUNET_BIO_ReadHandle *fileR;
+ int32_t rank;
+ char *ns_name;
struct GNUNET_CONTAINER_MetaData *meta;
- const char *fn;
+ int ret;
+ char *name_unique;
- if (strlen (fullname) < sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded))
- return GNUNET_OK;
- fn =
- &fullname[strlen (fullname) + 1 -
- sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
- if (fn[-1] != DIR_SEPARATOR)
- return GNUNET_OK;
+ if (NULL == (fileR = GNUNET_BIO_read_open (fullname)))
+ return GNUNET_SYSERR;
+ emsg = NULL;
+ ns_name = NULL;
+ if ( (GNUNET_OK != GNUNET_BIO_read (fileR, "pseudonym", &pd, sizeof (pd))) ||
+ (GNUNET_OK != GNUNET_BIO_read_int32 (fileR, &rank)) ||
+ (GNUNET_OK !=
+ GNUNET_BIO_read_string (fileR, "Read string error!", &ns_name, 200)) ||
+ (GNUNET_OK !=
+ GNUNET_BIO_read_meta_data (fileR, "Read meta data error!", &meta)) )
+ {
+ (void) GNUNET_BIO_read_close (fileR, &emsg);
+ GNUNET_free_non_null (emsg);
+ GNUNET_free_non_null (ns_name);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fullname));
+ return GNUNET_SYSERR;
+ }
+ if (NULL == ns_name)
+ ns_name = GNUNET_strdup (_("no-name"));
+ if (GNUNET_OK != GNUNET_BIO_read_close (fileR, &emsg))
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to parse metadata about pseudonym from file `%s': %s\n"), fullname,
+ emsg);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_directory_remove (fullname));
+ GNUNET_CONTAINER_meta_data_destroy (meta);
+ GNUNET_free (ns_name);
+ GNUNET_free_non_null (emsg);
+ return GNUNET_SYSERR;
+ }
ret = GNUNET_OK;
- if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (fn, &id))
- return GNUNET_OK; /* invalid name */
- if (GNUNET_OK != read_info (c->cfg, &id, &meta, &rating, NULL))
- return GNUNET_OK; /* ignore entry */
- if (c->iterator != NULL)
- ret = c->iterator (c->closure, &id, meta, rating);
+ name_unique = GNUNET_PSEUDONYM_name_uniquify (lpc->cfg, &pd, ns_name, NULL);
+ if (NULL != lpc->iterator)
+ ret = lpc->iterator (lpc->iterator_cls, &pd, ns_name, name_unique, meta, rank);
+ GNUNET_free (ns_name);
+ GNUNET_free_non_null (name_unique);
GNUNET_CONTAINER_meta_data_destroy (meta);
return ret;
}
+
/**
* List all available pseudonyms.
+ *
+ * @param cfg overall configuration
+ * @param iterator function to call for each pseudonym
+ * @param iterator_cls closure for iterator
+ * @return number of pseudonyms found
*/
int
-GNUNET_PSEUDONYM_list_all (struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_PSEUDONYM_Iterator iterator, void *closure)
+GNUNET_PSEUDONYM_list_all (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_PSEUDONYM_Iterator iterator,
+ void *iterator_cls)
{
struct ListPseudonymClosure cls;
char *fn;
int ret;
cls.iterator = iterator;
- cls.closure = closure;
+ cls.iterator_cls = iterator_cls;
cls.cfg = cfg;
fn = get_data_filename (cfg, PS_METADATA_DIR, NULL);
GNUNET_assert (fn != NULL);
return ret;
}
+
/**
- * Change the ranking of a pseudonym.
+ * Change the rank of a pseudonym.
*
- * @param nsid id of the pseudonym
- * @param delta by how much should the rating be
- * changed?
+ * @param cfg overall configuration
+ * @param pseudonym the pseudonym
+ * @param delta by how much should the rating be changed?
* @return new rating of the pseudonym
*/
int
-GNUNET_PSEUDONYM_rank (struct GNUNET_CONFIGURATION_Handle *cfg,
- const GNUNET_HashCode * nsid, int delta)
+GNUNET_PSEUDONYM_rank (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
+ int32_t delta)
{
struct GNUNET_CONTAINER_MetaData *meta;
int ret;
- int32_t ranking;
+ int32_t rank;
char *name;
name = NULL;
- ret = read_info (cfg, nsid, &meta, &ranking, &name);
+ ret = read_info (cfg, pseudonym, &meta, &rank, &name);
if (ret == GNUNET_SYSERR)
- {
- ranking = 0;
- meta = GNUNET_CONTAINER_meta_data_create ();
- }
- ranking += delta;
- write_pseudonym_info (cfg, nsid, meta, ranking, name);
+ {
+ rank = 0;
+ meta = GNUNET_CONTAINER_meta_data_create ();
+ }
+ rank += delta;
+ GNUNET_PSEUDONYM_set_info (cfg, pseudonym, name, meta, rank);
GNUNET_CONTAINER_meta_data_destroy (meta);
GNUNET_free_non_null (name);
- return ranking;
+ return rank;
}
-/**
- * Insert metadata into existing MD record (passed as cls).
- */
-static int
-merge_meta_helper (EXTRACTOR_KeywordType type, const char *data, void *cls)
-{
- struct GNUNET_CONTAINER_MetaData *meta = cls;
- GNUNET_CONTAINER_meta_data_insert (meta, type, data);
- return GNUNET_OK;
-}
-
-
/**
* Add a pseudonym to the set of known pseudonyms.
* For all pseudonym advertisements that we discover
- * FSUI should automatically call this function.
+ * FS should automatically call this function.
*
- * @param id the pseudonym identifier
+ * @param cfg overall configuration
+ * @param pseudonym the pseudonym to add
+ * @param meta metadata for the pseudonym
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
*/
-void
-GNUNET_PSEUDONYM_add (struct GNUNET_CONFIGURATION_Handle *cfg,
- const GNUNET_HashCode * id,
+int
+GNUNET_PSEUDONYM_add (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *pseudonym,
const struct GNUNET_CONTAINER_MetaData *meta)
{
char *name;
- int32_t ranking;
+ int32_t rank;
struct GNUNET_CONTAINER_MetaData *old;
char *fn;
struct stat sbuf;
+ int ret;
- ranking = 0;
- fn = get_data_filename (cfg, PS_METADATA_DIR, id);
+ rank = 0;
+ fn = get_data_filename (cfg, PS_METADATA_DIR, pseudonym);
GNUNET_assert (fn != NULL);
if ((0 == STAT (fn, &sbuf)) &&
- (GNUNET_OK == read_info (cfg, id, &old, &ranking, &name)))
+ (GNUNET_OK == read_info (cfg, pseudonym, &old, &rank, &name)))
+ {
+ GNUNET_CONTAINER_meta_data_merge (old, meta);
+ ret = GNUNET_PSEUDONYM_set_info (cfg, pseudonym, name, old, rank);
+ GNUNET_CONTAINER_meta_data_destroy (old);
+ GNUNET_free_non_null (name);
+ }
+ else
+ {
+ ret = GNUNET_PSEUDONYM_set_info (cfg, pseudonym, NULL, meta, rank);
+ }
+ GNUNET_free (fn);
+ internal_notify (pseudonym, meta, rank);
+ return ret;
+}
+
+
+/* ***************************** cryptographic operations ************************* */
+
+/**
+ * Handle for a pseudonym (private key).
+ */
+struct GNUNET_PseudonymHandle
+{
+ /**
+ * 256-bit 'd' secret value (mod 'n', where n is 256-bit for NIST P-256).
+ */
+ unsigned char d[256 / 8];
+
+ /**
+ * Public key corresponding to the private key.
+ */
+ struct GNUNET_PseudonymIdentifier public_key;
+};
+
+
+/**
+ * If target != size, move target bytes to the end of the size-sized
+ * buffer and zero out the first target-size bytes.
+ *
+ * @param buf original buffer
+ * @param size number of bytes in the buffer
+ * @param target target size of the buffer
+ */
+static void
+adjust (unsigned char *buf, size_t size, size_t target)
+{
+ if (size < target)
+ {
+ memmove (&buf[target - size], buf, size);
+ memset (buf, 0, target - size);
+ }
+}
+
+
+/**
+ * Extract values from an S-expression.
+ *
+ * @param array where to store the result(s)
+ * @param sexp S-expression to parse
+ * @param topname top-level name in the S-expression that is of interest
+ * @param elems names of the elements to extract
+ * @return 0 on success
+ */
+static int
+key_from_sexp (gcry_mpi_t * array, gcry_sexp_t sexp, const char *topname,
+ const char *elems)
+{
+ gcry_sexp_t list;
+ gcry_sexp_t l2;
+ const char *s;
+ unsigned int i;
+ unsigned int idx;
+
+ if (! (list = gcry_sexp_find_token (sexp, topname, 0)))
+ return 1;
+ l2 = gcry_sexp_cadr (list);
+ gcry_sexp_release (list);
+ list = l2;
+ if (! list)
+ return 2;
+ idx = 0;
+ for (s = elems; *s; s++, idx++)
+ {
+ if (! (l2 = gcry_sexp_find_token (list, s, 1)))
{
- GNUNET_CONTAINER_meta_data_get_contents (meta, &merge_meta_helper, old);
- write_pseudonym_info (cfg, id, old, ranking, name);
- GNUNET_CONTAINER_meta_data_destroy (old);
- GNUNET_free_non_null (name);
+ for (i = 0; i < idx; i++)
+ {
+ gcry_free (array[i]);
+ array[i] = NULL;
+ }
+ gcry_sexp_release (list);
+ return 3; /* required parameter not found */
}
- else
+ array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
+ gcry_sexp_release (l2);
+ if (! array[idx])
{
- write_pseudonym_info (cfg, id, meta, ranking, NULL);
+ for (i = 0; i < idx; i++)
+ {
+ gcry_free (array[i]);
+ array[i] = NULL;
+ }
+ gcry_sexp_release (list);
+ return 4; /* required parameter is invalid */
}
- GNUNET_free (fn);
- internal_notify (id, meta, ranking);
+ }
+ gcry_sexp_release (list);
+ return 0;
+}
+
+
+/**
+ * Create a pseudonym.
+ *
+ * @param filename name of the file to use for storage, NULL for in-memory only
+ * @return handle to the private key of the pseudonym
+ */
+struct GNUNET_PseudonymHandle *
+GNUNET_PSEUDONYM_create (const char *filename)
+{
+ struct GNUNET_PseudonymHandle *ph;
+ ssize_t ret;
+ gcry_sexp_t r_key;
+ gcry_sexp_t params;
+ gcry_error_t rc;
+ gcry_mpi_t skey[2];
+ size_t size;
+
+ ph = GNUNET_malloc (sizeof (struct GNUNET_PseudonymHandle));
+ if ( (NULL != filename) &&
+ (GNUNET_YES == GNUNET_DISK_file_test (filename)) )
+ {
+ ret = GNUNET_DISK_fn_read (filename, ph,
+ sizeof (struct GNUNET_PseudonymHandle));
+ /* Note: we don't do any validation here, maybe we should? */
+ if (sizeof (struct GNUNET_PseudonymHandle) == ret)
+ return ph;
+ }
+ if (0 != (rc = gcry_sexp_build (¶ms, NULL,
+ "(genkey(ecdsa(curve \"NIST P-256\")))")))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
+ return NULL;
+ }
+ if (0 != (rc = gcry_pk_genkey (&r_key, params)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
+ return NULL;
+ }
+ /* NOTE: treating a point as a normal MPI value; hopefully that works... */
+ rc = key_from_sexp (skey, r_key, "private-key", "dq");
+ if (0 != rc)
+ rc = key_from_sexp (skey, r_key, "private-key", "dq");
+ if (0 != rc)
+ rc = key_from_sexp (skey, r_key, "ecc", "dq");
+ gcry_sexp_release (r_key);
+ size = sizeof (ph->d);
+ GNUNET_assert (0 ==
+ gcry_mpi_print (GCRYMPI_FMT_USG, ph->d, size, &size,
+ skey[0]));
+ adjust (ph->d, size, sizeof (ph->d));
+ size = sizeof (ph->public_key.q);
+ GNUNET_assert (0 ==
+ gcry_mpi_print (GCRYMPI_FMT_USG, ph->public_key.q, size, &size,
+ skey[1]));
+ adjust (ph->public_key.q, size, sizeof (ph->public_key.q));
+ gcry_mpi_release (skey[0]);
+ gcry_mpi_release (skey[1]);
+ if (NULL != filename)
+ {
+ ret = GNUNET_DISK_fn_write (filename, ph, sizeof (struct GNUNET_PseudonymHandle),
+ GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
+ if (sizeof (struct GNUNET_PseudonymHandle) != ret)
+ {
+ GNUNET_free (ph);
+ return NULL;
+ }
+ }
+ return ph;
+}
+
+
+/**
+ * Create a pseudonym, from a file that must already exist.
+ *
+ * @param filename name of the file to use for storage, NULL for in-memory only
+ * @return handle to the private key of the pseudonym
+ */
+struct GNUNET_PseudonymHandle *
+GNUNET_PSEUDONYM_create_from_existing_file (const char *filename)
+{
+ struct GNUNET_PseudonymHandle *ph;
+ ssize_t ret;
+
+ ph = GNUNET_malloc (sizeof (struct GNUNET_PseudonymHandle));
+ ret = GNUNET_DISK_fn_read (filename, ph,
+ sizeof (struct GNUNET_PseudonymHandle));
+ if (sizeof (struct GNUNET_PseudonymHandle) != ret)
+ {
+ GNUNET_free (ph);
+ return NULL;
+ }
+ /* Note: we don't do any validation here; maybe we should? */
+ return ph;
+}
+
+
+/**
+ * Get the handle for the 'anonymous' pseudonym shared by all users.
+ * That pseudonym uses a fixed 'secret' for the private key; this
+ * construction is useful to make anonymous and pseudonymous APIs
+ * (and packets) indistinguishable on the network. See #2564.
+ *
+ * @return handle to the (non-secret) private key of the 'anonymous' pseudonym
+ */
+struct GNUNET_PseudonymHandle *
+GNUNET_PSEUDONYM_get_anonymous_pseudonym_handle ()
+{
+ struct GNUNET_PseudonymHandle *ph;
+
+ ph = GNUNET_malloc (sizeof (struct GNUNET_PseudonymHandle));
+ /* FIXME: if we use 'd=0' for the anonymous handle (as per#2564),
+ then I believe the public key should be also zero, as Q=0P=0.
+ However, libgcrypt's point representation is completely internal,
+ and treats a z-coordinate of zero as infinity, so we likely need
+ to set it to (0,0,1) internally --- or actually calculate Q=qP
+ explicitly. Either way, we don't have an API to do so yet :-(.
+ */
+ GNUNET_break (0);
+ return ph;
+}
+
+
+/**
+ * Destroy a pseudonym handle. Does NOT remove the private key from
+ * the disk.
+ *
+ * @param ph pseudonym handle to destroy
+ */
+void
+GNUNET_PSEUDONYM_destroy (struct GNUNET_PseudonymHandle *ph)
+{
+ GNUNET_free (ph);
+}
+
+
+/**
+ * Convert the data specified in the given purpose argument to an
+ * S-expression suitable for signature operations.
+ *
+ * @param purpose data to convert
+ * @return converted s-expression
+ */
+static gcry_sexp_t
+data_to_pkcs1 (const struct GNUNET_PseudonymSignaturePurpose *purpose)
+{
+ struct GNUNET_CRYPTO_ShortHashCode hc;
+ size_t bufSize;
+ gcry_sexp_t data;
+
+ GNUNET_CRYPTO_short_hash (purpose, ntohl (purpose->size), &hc);
+#define FORMATSTRING "(4:data(5:flags3:raw)(5:value32:01234567890123456789012345678901))"
+ bufSize = strlen (FORMATSTRING) + 1;
+ {
+ char buff[bufSize];
+
+ memcpy (buff, FORMATSTRING, bufSize);
+ memcpy (&buff
+ [bufSize -
+ strlen
+ ("01234567890123456789012345678901))")
+ - 1], &hc, sizeof (struct GNUNET_CRYPTO_ShortHashCode));
+ GNUNET_assert (0 == gcry_sexp_new (&data, buff, bufSize, 0));
+ }
+#undef FORMATSTRING
+ return data;
+}
+
+
+/**
+ * Cryptographically sign some data with the pseudonym.
+ *
+ * @param ph private key used for signing (corresponds to 'x' in #2564)
+ * @param purpose data to sign
+ * @param seed hash of the plaintext of the data that we are signing,
+ * used for deterministic PRNG for anonymous signing;
+ * corresponds to 'k' in section 2.7 of #2564
+ * @param signing_key modifier to apply to the private key for signing;
+ * corresponds to 'h' in section 2.3 of #2564.
+ * @param signature where to store the signature
+ * @return GNUNET_SYSERR on failure
+ */
+int
+GNUNET_PSEUDONYM_sign (struct GNUNET_PseudonymHandle *ph,
+ const struct GNUNET_PseudonymSignaturePurpose *purpose,
+ const struct GNUNET_HashCode *seed,
+ const struct GNUNET_HashCode *signing_key,
+ struct GNUNET_PseudonymSignature *signature)
+{
+ size_t size;
+ size_t erroff;
+ gcry_mpi_t x;
+ gcry_mpi_t k;
+ gcry_mpi_t h;
+ gcry_mpi_t d;
+ gcry_mpi_t n; /* n from P-256 */
+ gcry_sexp_t spriv;
+ gcry_sexp_t data;
+ gcry_sexp_t result;
+ gcry_mpi_t rs[2];
+ int rc;
+
+ /* get private key 'x' from pseudonym */
+ size = sizeof (ph->d);
+ if (0 != (rc = gcry_mpi_scan (&x, GCRYMPI_FMT_USG,
+ &ph->d,
+ size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ return GNUNET_SYSERR;
+ }
+ /* get 'h' value from signing key */
+ size = sizeof (struct GNUNET_HashCode);
+ if (0 != (rc = gcry_mpi_scan (&h, GCRYMPI_FMT_USG,
+ signing_key,
+ size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ gcry_mpi_release (x);
+ return GNUNET_SYSERR;
+ }
+
+ /* initialize 'n' from P-256; hex copied from libgcrypt code */
+ if (0 != (rc = gcry_mpi_scan (&n, GCRYMPI_FMT_HEX,
+ "0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551", 0, NULL)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ gcry_mpi_release (x);
+ gcry_mpi_release (h);
+ return GNUNET_SYSERR;
+ }
+
+ /* calculate d = x + h mod n */
+ d = gcry_mpi_new (256);
+ gcry_mpi_addm (d, x, h, n);
+ gcry_mpi_release (x);
+ gcry_mpi_release (h);
+ gcry_mpi_release (n);
+
+ /* now build sexpression with the signing key;
+ NOTE: libgcrypt docs say that we should specify 'Q', but
+ with the current API we cannot calculate Q=dP, so hopefully
+ libgcrypt will derive it from 'd' for us... */
+ if (0 != (rc = gcry_sexp_build (&spriv, &erroff,
+ "(private-key(ecc(curve \"NIST P-256\")(d %m)))",
+ d)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
+ gcry_mpi_release (d);
+ return GNUNET_SYSERR;
+ }
+ gcry_mpi_release (d);
+ /* prepare data for signing */
+ data = data_to_pkcs1 (purpose);
+
+ /* get 'k' value from seed, if available */
+ if (NULL != seed)
+ {
+ size = sizeof (struct GNUNET_HashCode);
+ if (0 != (rc = gcry_mpi_scan (&k, GCRYMPI_FMT_USG,
+ seed,
+ size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ gcry_mpi_release (x);
+ return GNUNET_SYSERR;
+ }
+ }
+
+ /* actually create signature */
+ /* FIXME: need API to pass 'k' if 'seed' was non-NULL! */
+ if (0 != (rc = gcry_pk_sign (&result, data, spriv)))
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("ECC signing failed at %s:%d: %s\n"), __FILE__,
+ __LINE__, gcry_strerror (rc));
+ gcry_sexp_release (data);
+ gcry_sexp_release (spriv);
+ if (NULL != seed)
+ gcry_mpi_release (k);
+ memset (signature, 0, sizeof (struct GNUNET_PseudonymSignature));
+ return GNUNET_SYSERR;
+ }
+ if (NULL != seed)
+ gcry_mpi_release (k);
+ gcry_sexp_release (data);
+ gcry_sexp_release (spriv);
+
+ /* extract 'r' and 's' values from sexpression 'result' and store in 'signature';
+ FIXME: libgcrypt does not document format of s-expression returned for ECC
+ signatures; so "ecc" here is just a guess. */
+ if (0 != (rc = key_from_sexp (rs, result, "ecc", "rs")))
+ {
+ GNUNET_break (0);
+ gcry_sexp_release (result);
+ return GNUNET_SYSERR;
+ }
+ gcry_sexp_release (result);
+ size = sizeof (signature->sig_r);
+ if (0 != (rc = gcry_mpi_print (GCRYMPI_FMT_USG, (unsigned char *) signature->sig_r, size,
+ &size, rs[0])))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_print", rc);
+ gcry_mpi_release (rs[0]);
+ gcry_mpi_release (rs[1]);
+ return GNUNET_SYSERR;
+ }
+ gcry_mpi_release (rs[0]);
+ size = sizeof (signature->sig_s);
+ if (0 != (rc = gcry_mpi_print (GCRYMPI_FMT_USG, (unsigned char *) signature->sig_s, size,
+ &size, rs[1])))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_print", rc);
+ gcry_mpi_release (rs[1]);
+ return GNUNET_SYSERR;
+ }
+ gcry_mpi_release (rs[1]);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Given a pseudonym and a signing key, derive the corresponding public
+ * key that would be used to verify the resulting signature.
+ *
+ * @param pseudonym the public key (g^x in DSA, dQ in ECDSA)
+ * @param signing_key input to derive 'h' (see section 2.4 of #2564)
+ * @param verification_key resulting public key to verify the signature
+ * created from the 'ph' of 'pseudonym' and the 'signing_key';
+ * the value stored here can then be given to GNUNET_PSEUDONYM_verify.
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int
+GNUNET_PSEUDONYM_derive_verification_key (struct GNUNET_PseudonymIdentifier *pseudonym,
+ const struct GNUNET_HashCode *signing_key,
+ struct GNUNET_PseudonymIdentifier *verification_key)
+{
+ struct GNUNET_HashCode hc;
+ struct GNUNET_HashCode x;
+ gcry_mpi_t h;
+ size_t size;
+ int rc;
+
+ /* get 'h' value from signing key */
+ size = sizeof (struct GNUNET_HashCode);
+ if (0 != (rc = gcry_mpi_scan (&h, GCRYMPI_FMT_USG,
+ signing_key,
+ size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ return GNUNET_SYSERR;
+ }
+ /* FIXME: calculate hQ --- need point multiplication API! */
+ gcry_mpi_release (h);
+ /* FIXME: calculate V = dQ + hQ --- need point addition API! */
+
+ GNUNET_break (0);
+ GNUNET_CRYPTO_hash (pseudonym, sizeof (*pseudonym), &hc);
+ GNUNET_CRYPTO_hash_xor (&hc, signing_key, &x);
+ memset (verification_key, 0, sizeof (struct GNUNET_PseudonymIdentifier));
+ memcpy (verification_key, &x, GNUNET_MIN (sizeof (x), sizeof (*verification_key)));
+ return GNUNET_OK;
+}
+
+
+/**
+ * Verify a signature made with a pseudonym.
+ *
+ * @param purpose data that was signed
+ * @param signature signature to verify
+ * @param verification_key public key to use for checking the signature;
+ * corresponds to 'g^(x+h)' in section 2.4 of #2564.
+ * @return GNUNET_OK on success (signature valid, 'pseudonym' set),
+ * GNUNET_SYSERR if the signature is invalid
+ */
+int
+GNUNET_PSEUDONYM_verify (const struct GNUNET_PseudonymSignaturePurpose *purpose,
+ const struct GNUNET_PseudonymSignature *signature,
+ const struct GNUNET_PseudonymIdentifier *verification_key)
+{
+#if FUTURE
+ gcry_sexp_t data;
+ gcry_sexp_t sig_sexpr;
+ gcry_sexp_t pk_sexpr;
+ size_t size;
+ gcry_mpi_t r;
+ gcry_mpi_t s;
+ gcry_mpi_t q;
+ size_t erroff;
+ int rc;
+
+ /* build s-expression for signature */
+ size = sizeof (signature->sig_r);
+ if (0 != (rc = gcry_mpi_scan (&r, GCRYMPI_FMT_USG,
+ signature->sig_r, size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ return GNUNET_SYSERR;
+ }
+ size = sizeof (signature->sig_s);
+ if (0 != (rc = gcry_mpi_scan (&s, GCRYMPI_FMT_USG,
+ signature->sig_s, size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ gcry_mpi_release (r);
+ return GNUNET_SYSERR;
+ }
+ if (0 != (rc = gcry_sexp_build (&sig_sexpr, &erroff, "(sig-val(ecc(r %m)(s %m)))",
+ r, s)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
+ gcry_mpi_release (r);
+ gcry_mpi_release (s);
+ return GNUNET_SYSERR;
+ }
+ gcry_mpi_release (r);
+ gcry_mpi_release (s);
+
+ /* build s-expression for data that was signed */
+ data = data_to_pkcs1 (purpose);
+
+ /* build s-expression for public key */
+ /* NOTE: treating a point as a normal MPI value; hopefully that works... */
+ size = sizeof (verification_key->q);
+ if (0 != (rc = gcry_mpi_scan (&q, GCRYMPI_FMT_USG,
+ verification_key->q, size, &size)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
+ gcry_sexp_release (data);
+ gcry_sexp_release (sig_sexpr);
+ return GNUNET_SYSERR;
+ }
+ if (0 != (rc = gcry_sexp_build (&sig_sexpr, &erroff, "(public-key(ecc(curve \"NIST P-256\")(q %m)))",
+ q)))
+ {
+ LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
+ gcry_mpi_release (q);
+ gcry_sexp_release (data);
+ gcry_sexp_release (sig_sexpr);
+ return GNUNET_SYSERR;
+ }
+ gcry_mpi_release (q);
+
+ /* finally, verify the signature */
+ rc = gcry_pk_verify (sig_sexpr, data, pk_sexpr);
+ gcry_sexp_release (sig_sexpr);
+ gcry_sexp_release (data);
+ gcry_sexp_release (pk_sexpr);
+ if (rc)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("RSA signature verification failed at %s:%d: %s\n"), __FILE__,
+ __LINE__, gcry_strerror (rc));
+ return GNUNET_SYSERR;
+ }
+#else
+ GNUNET_break (0);
+#endif
+ return GNUNET_OK;
}
+/**
+ * Get the identifier (public key) of a pseudonym.
+ *
+ * @param ph pseudonym handle with the private key
+ * @param pseudonym pseudonym identifier (set based on 'ph')
+ */
+void
+GNUNET_PSEUDONYM_get_identifier (struct GNUNET_PseudonymHandle *ph,
+ struct GNUNET_PseudonymIdentifier *pseudonym)
+{
+ memcpy (pseudonym, &ph->public_key,
+ sizeof (struct GNUNET_PseudonymIdentifier));
+}
+/**
+ * Remove pseudonym from the set of known pseudonyms.
+ *
+ * @param cfg overall configuration
+ * @param id the pseudonym identifier
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int
+GNUNET_PSEUDONYM_remove (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PseudonymIdentifier *id)
+{
+ char *fn;
+ int result;
+
+ fn = get_data_filename (cfg, PS_METADATA_DIR, id);
+ if (NULL == fn)
+ return GNUNET_SYSERR;
+ result = UNLINK (fn);
+ GNUNET_free (fn);
+ return (0 == result) ? GNUNET_OK : GNUNET_SYSERR;
+}
/* end of pseudonym.c */
projects / oweals / gnunet.git / blobdiff