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416 lines
15 KiB
C
416 lines
15 KiB
C
/*
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Serval Distributed Numbering Architecture (DNA)
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Copyright (C) 2010 Paul Gardner-Stephen
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "serval.h"
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#include "str.h"
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#include "rhizome.h"
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#include <stdlib.h>
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int is_rhizome_enabled()
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{
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return confValueGetBoolean("rhizome.enable", 1);
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}
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int is_rhizome_http_enabled()
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{
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return confValueGetBoolean("rhizome.enable", 1)
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&& confValueGetBoolean("rhizome.http.enable", 1)
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&& rhizome_db;
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}
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int is_rhizome_mdp_enabled()
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{
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return confValueGetBoolean("rhizome.enable", 1)
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&& confValueGetBoolean("rhizome.mdp.enable", 1)
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&& rhizome_db;
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}
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int is_rhizome_mdp_server_running()
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{
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return is_rhizome_mdp_enabled();
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}
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int is_rhizome_advertise_enabled()
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{
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return confValueGetBoolean("rhizome.enable", 1)
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&& confValueGetBoolean("rhizome.advertise.enable", 1)
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&& rhizome_db
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&& ( is_rhizome_http_server_running()
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||is_rhizome_mdp_server_running());
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}
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int rhizome_fetch_delay_ms()
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{
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return confValueGetInt64Range("rhizome.fetch_delay_ms", 50, 1, 3600000);
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}
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/* Import a bundle from a pair of files, one containing the manifest and the optional other
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containing the payload. The logic is all in rhizome_bundle_import(). This function just wraps
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that function and manages file and object buffers and lifetimes.
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*/
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int rhizome_bundle_import_files(const char *manifest_path, const char *payload_path, int ttl)
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{
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if (debug & DEBUG_RHIZOME)
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DEBUGF("(manifest_path=%s, payload_path=%s, ttl=%d)",
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manifest_path ? alloca_str_toprint(manifest_path) : "NULL",
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payload_path ? alloca_str_toprint(payload_path) : "NULL",
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ttl
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);
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/* Read manifest file if no manifest was given */
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if (!manifest_path)
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return WHY("No manifest supplied");
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int ret = 0;
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rhizome_manifest *m = rhizome_new_manifest();
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if (!m)
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ret = WHY("Out of manifests");
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else if (rhizome_read_manifest_file(m, manifest_path, 0 /* file not buffer */) == -1)
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ret = WHY("Could not read manifest file");
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else if (rhizome_manifest_verify(m))
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ret = WHY("Verification of manifest file failed");
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else {
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/* Make sure we store signatures */
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m->manifest_bytes=m->manifest_all_bytes;
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m->dataFileName = strdup(payload_path);
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if (rhizome_manifest_check_file(m))
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ret = WHY("Payload does not belong to manifest");
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else
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ret = rhizome_bundle_import(m, ttl);
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}
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if (m)
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rhizome_manifest_free(m);
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return ret;
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}
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/* Import a bundle from a finalised manifest struct. The dataFileName element must give the path
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of a readable file containing the payload unless the payload is null (zero length). The logic is
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all in rhizome_add_manifest(). This function just wraps that function and manages object buffers
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and lifetimes.
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*/
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int rhizome_bundle_import(rhizome_manifest *m, int ttl)
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{
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if (debug & DEBUG_RHIZOME)
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DEBUGF("(m=%p, ttl=%d)", m, ttl);
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/* Add the manifest and its payload to the Rhizome database. */
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if (m->fileLength > 0 && !(m->dataFileName && m->dataFileName[0]))
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return WHY("Missing data file name");
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if (rhizome_manifest_check_file(m))
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return WHY("File does not belong to manifest");
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int ret = rhizome_manifest_check_duplicate(m, NULL);
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if (ret == 0) {
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ret = rhizome_add_manifest(m, ttl);
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if (ret == -1)
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WHY("rhizome_add_manifest() failed");
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}
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return ret;
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}
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int rhizome_manifest_check_sanity(rhizome_manifest *m_in)
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{
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/* Ensure manifest meets basic sanity checks. */
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const char *service = rhizome_manifest_get(m_in, "service", NULL, 0);
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const char *sender = rhizome_manifest_get(m_in, "sender", NULL, 0);
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const char *recipient = rhizome_manifest_get(m_in, "recipient", NULL, 0);
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if (service == NULL || !service[0])
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return WHY("Manifest missing 'service' field");
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if (rhizome_manifest_get_ll(m_in, "date") == -1)
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return WHY("Manifest missing 'date' field");
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if (strcasecmp(service, RHIZOME_SERVICE_FILE) == 0) {
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const char *name = rhizome_manifest_get(m_in, "name", NULL, 0);
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if (name == NULL)
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return WHY("Manifest missing 'name' field");
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} else if (strcasecmp(service, RHIZOME_SERVICE_MESHMS) == 0) {
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if (sender == NULL || !sender[0])
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return WHY("MeshMS Manifest missing 'sender' field");
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if (!str_is_subscriber_id(sender))
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return WHYF("MeshMS Manifest contains invalid 'sender' field: %s", sender);
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if (recipient == NULL || !recipient[0])
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return WHY("MeshMS Manifest missing 'recipient' field");
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if (!str_is_subscriber_id(recipient))
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return WHYF("MeshMS Manifest contains invalid 'recipient' field: %s", recipient);
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} else {
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return WHY("Invalid service type");
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}
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if (debug & DEBUG_RHIZOME)
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DEBUGF("sender='%s'", sender ? sender : "(null)");
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/* passes all sanity checks */
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return 0;
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}
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/*
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A bundle can either be an ordinary manifest-payload pair, or a group description.
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- Group descriptions are manifests with no payload that have the "isagroup" variable set. They
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get stored in the manifests table AND a reference is added to the grouplist table. Any
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manifest, including any group manifest, may be a member of zero or one group. This allows a
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nested, i.e., multi-level group hierarchy where sub-groups will only typically be discovered
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by joining the parent group.
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*/
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int rhizome_manifest_bind_id(rhizome_manifest *m_in)
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{
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if (rhizome_manifest_createid(m_in) == -1)
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return -1;
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/* The ID is implicit in transit, but we need to store it in the file, so that reimporting
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manifests on receiver nodes works easily. We might implement something that strips the id
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variable out of the manifest when sending it, or some other scheme to avoid sending all the
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extra bytes. */
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rhizome_manifest_set(m_in, "id", alloca_tohex_bid(m_in->cryptoSignPublic));
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if (!is_sid_any(m_in->author)) {
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/* Set the BK using the provided authorship information.
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Serval Security Framework defines BK as being:
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BK = privateKey XOR sha512(RS##BID), where BID = cryptoSignPublic,
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and RS is the rhizome secret for the specified author.
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The nice thing about this specification is that:
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privateKey = BK XOR sha512(RS##BID), so the same function can be used
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to encrypt and decrypt the BK field. */
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const unsigned char *rs;
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int rs_len=0;
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unsigned char bkbytes[RHIZOME_BUNDLE_KEY_BYTES];
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if (rhizome_find_secret(m_in->author,&rs_len,&rs)) {
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return WHYF("Failed to obtain RS for %s to calculate BK",
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alloca_tohex_sid(m_in->author));
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}
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if (!rhizome_secret2bk(m_in->cryptoSignPublic,rs,rs_len,bkbytes,m_in->cryptoSignSecret)) {
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char bkhex[RHIZOME_BUNDLE_KEY_STRLEN + 1];
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(void) tohex(bkhex, bkbytes, RHIZOME_BUNDLE_KEY_BYTES);
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if (debug&DEBUG_RHIZOME) DEBUGF("set BK=%s", bkhex);
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rhizome_manifest_set(m_in, "BK", bkhex);
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} else {
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return WHY("Failed to set BK");
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}
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}
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return 0;
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}
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int rhizome_manifest_bind_file(rhizome_manifest *m_in,const char *filename,int encryptP)
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{
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/* Keep payload file name handy for later */
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m_in->dataFileName = strdup(filename);
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/* Keep note as to whether we are supposed to be encrypting this file or not */
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m_in->payloadEncryption=encryptP;
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if (encryptP) rhizome_manifest_set_ll(m_in,"crypt",1);
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else rhizome_manifest_set_ll(m_in,"crypt",0);
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/* Get length of payload. An empty filename means empty payload. */
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if (filename[0]) {
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struct stat stat;
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if (lstat(filename,&stat))
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return WHYF("Could not stat() payload file '%s'",filename);
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m_in->fileLength = stat.st_size;
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} else
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m_in->fileLength = 0;
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if (debug & DEBUG_RHIZOME)
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DEBUGF("filename=%s, fileLength=%lld", filename, m_in->fileLength);
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rhizome_manifest_set_ll(m_in,"filesize",m_in->fileLength);
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/* Compute hash of non-empty payload */
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if (m_in->fileLength != 0) {
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char hexhashbuf[RHIZOME_FILEHASH_STRLEN + 1];
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if (rhizome_hash_file(m_in,filename, hexhashbuf))
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return WHY("Could not hash file.");
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memcpy(&m_in->fileHexHash[0], &hexhashbuf[0], sizeof hexhashbuf);
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rhizome_manifest_set(m_in, "filehash", m_in->fileHexHash);
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m_in->fileHashedP = 1;
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} else {
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m_in->fileHexHash[0] = '\0';
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rhizome_manifest_del(m_in, "filehash");
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m_in->fileHashedP = 0;
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}
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return 0;
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}
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int rhizome_manifest_check_file(rhizome_manifest *m_in)
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{
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long long gotfile = 0;
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if (sqlite_exec_int64(&gotfile, "SELECT COUNT(*) FROM FILES WHERE ID='%s' and datavalid=1;", m_in->fileHexHash) != 1) {
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WHYF("Failed to count files");
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return 0;
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}
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if (gotfile) {
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/* Skipping file checks for bundle, as file is already in the database */
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return 0;
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}
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/* Find out whether the payload is expected to be encrypted or not */
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m_in->payloadEncryption=rhizome_manifest_get_ll(m_in, "crypt");
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/* Check payload file is accessible and discover its length, then check that it
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matches the file size stored in the manifest */
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long long mfilesize = rhizome_manifest_get_ll(m_in, "filesize");
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m_in->fileLength = 0;
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if (m_in->dataFileName && m_in->dataFileName[0]) {
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struct stat stat;
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if (lstat(m_in->dataFileName,&stat) == -1) {
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if (errno != ENOENT || mfilesize != 0)
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return WHYF_perror("stat(%s)", m_in->dataFileName);
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} else {
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m_in->fileLength = stat.st_size;
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}
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}
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if (debug & DEBUG_RHIZOME)
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DEBUGF("filename=%s, fileLength=%lld", m_in->dataFileName ? alloca_str_toprint(m_in->dataFileName) : "NULL", m_in->fileLength);
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if (mfilesize != -1 && mfilesize != m_in->fileLength) {
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WHYF("Manifest.filesize (%lld) != actual file size (%lld)", mfilesize, m_in->fileLength);
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return -1;
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}
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/* If payload is empty, ensure manifest has not file hash, otherwis compute the hash of the
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payload and check that it matches manifest. */
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const char *mhexhash = rhizome_manifest_get(m_in, "filehash", NULL, 0);
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if (m_in->fileLength != 0) {
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char hexhashbuf[RHIZOME_FILEHASH_STRLEN + 1];
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if (rhizome_hash_file(m_in,m_in->dataFileName, hexhashbuf))
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return WHY("Could not hash file.");
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memcpy(&m_in->fileHexHash[0], &hexhashbuf[0], sizeof hexhashbuf);
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m_in->fileHashedP = 1;
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if (!mhexhash) return WHY("manifest contains no file hash");
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if (mhexhash && strcmp(m_in->fileHexHash, mhexhash)) {
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WHYF("Manifest.filehash (%s) does not match payload hash (%s)", mhexhash, m_in->fileHexHash);
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return -1;
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}
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} else {
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if (mhexhash != NULL) {
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WHYF("Manifest.filehash (%s) should be absent for empty payload", mhexhash);
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return -1;
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}
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}
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return 0;
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}
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/* Check if a manifest is already stored for the same payload with the same details.
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This catches the case of "dna rhizome add file <filename>" on the same file more than once.
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(Debounce!) */
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int rhizome_manifest_check_duplicate(rhizome_manifest *m_in, rhizome_manifest **m_out)
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{
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if (debug & DEBUG_RHIZOME) DEBUG("Checking for duplicate");
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if (m_out) *m_out = NULL;
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rhizome_manifest *dupm = NULL;
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if (rhizome_find_duplicate(m_in, &dupm,0 /* version doesn't matter */) == -1)
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return WHY("Errors encountered searching for duplicate manifest");
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if (dupm) {
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/* If the caller wants the duplicate manifest, it must be finalised, otherwise discarded. */
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if (m_out) {
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*m_out = dupm;
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}
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else
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rhizome_manifest_free(dupm);
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if (debug & DEBUG_RHIZOME) DEBUG("Found a duplicate");
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return 2;
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}
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if (debug & DEBUG_RHIZOME) DEBUG("No duplicate found");
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return 0;
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}
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int rhizome_add_manifest(rhizome_manifest *m_in,int ttl)
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{
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if (debug & DEBUG_RHIZOME)
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DEBUGF("rhizome_add_manifest(m_in=%p, ttl=%d)",m_in, ttl);
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if (m_in->finalised==0)
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return WHY("Manifest must be finalised before being stored");
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/* Store time to live, clamped to within legal range */
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m_in->ttl = ttl < 0 ? 0 : ttl > 254 ? 254 : ttl;
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if (rhizome_manifest_check_sanity(m_in))
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return WHY("Sanity checks on manifest failed");
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if (rhizome_manifest_check_file(m_in))
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return WHY("File does not belong to this manifest");
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/* Get manifest version number. */
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m_in->version = rhizome_manifest_get_ll(m_in, "version");
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if (m_in->version==-1)
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return WHY("Manifest must have a version number");
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/* Supply manifest version number if missing, so we can do the version check below */
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if (m_in->version == -1) {
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m_in->version = gettime_ms();
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rhizome_manifest_set_ll(m_in, "version", m_in->version);
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}
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/* If the manifest already has an ID */
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char id[SID_STRLEN + 1];
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if (rhizome_manifest_get(m_in, "id", id, SID_STRLEN + 1)) {
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str_toupper_inplace(id);
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/* Discard the new manifest unless it is newer than the most recent known version with the same ID */
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long long storedversion = -1;
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switch (sqlite_exec_int64(&storedversion, "SELECT version from manifests where id='%s';", id)) {
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case -1:
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return WHY("Select failed");
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case 0:
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if (debug & DEBUG_RHIZOME) DEBUG("No existing manifest");
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break;
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case 1:
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if (debug & DEBUG_RHIZOME) DEBUGF("Found existing version=%lld, new version=%lld", storedversion, m_in->version);
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if (m_in->version < storedversion)
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return WHY("Newer version exists");
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if (m_in->version == storedversion)
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return WHY("Same version of manifest exists, not adding");
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break;
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default:
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return WHY("Select found too many rows!");
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}
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} else {
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/* no manifest ID */
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return WHY("Manifest does not have an ID");
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}
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/* Okay, it is written, and can be put directly into the rhizome database now */
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if (rhizome_store_bundle(m_in) == -1)
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return WHY("rhizome_store_bundle() failed.");
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// This message used in tests; do not modify or remove.
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const char *service = rhizome_manifest_get(m_in, "service", NULL, 0);
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INFOF("RHIZOME ADD MANIFEST service=%s bid=%s version=%lld",
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service ? service : "NULL",
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alloca_tohex_sid(m_in->cryptoSignPublic),
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m_in->version
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);
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monitor_announce_bundle(m_in);
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return 0;
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}
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/* Update an existing Rhizome bundle */
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int rhizome_bundle_push_update(char *id,long long version,unsigned char *data,int appendP)
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{
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return WHY("Not implemented");
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}
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/* When voice traffic is being carried, we need to throttle Rhizome down
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to a more sensible level. Or possibly even supress it entirely.
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*/
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time_ms_t rhizome_voice_timeout = -1;
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int rhizome_saw_voice_traffic()
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{
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/* We are in "voice mode" for a second after sending a voice frame */
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rhizome_voice_timeout=gettime_ms()+1000;
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return 0;
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}
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