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309 lines
9.5 KiB
C
309 lines
9.5 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 <stdlib.h>
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#include <assert.h>
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#include "serval.h"
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#include "conf.h"
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#include "str.h"
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#include "rhizome.h"
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#include "dataformats.h"
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int is_rhizome_enabled()
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{
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return config.rhizome.enable;
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}
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int is_rhizome_http_enabled()
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{
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return config.rhizome.enable
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&& config.rhizome.http.enable
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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 config.rhizome.enable
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&& config.rhizome.mdp.enable
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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 config.rhizome.enable
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&& config.rhizome.advertise.enable
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&& rhizome_db
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&& (is_rhizome_http_server_running() || 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 config.rhizome.fetch_delay_ms;
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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(rhizome_manifest *m, const char *manifest_path, const char *filepath)
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{
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if (config.debug.rhizome)
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DEBUGF("(manifest_path=%s, filepath=%s)",
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manifest_path ? alloca_str_toprint(manifest_path) : "NULL",
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filepath ? alloca_str_toprint(filepath) : "NULL");
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unsigned char buffer[MAX_MANIFEST_BYTES];
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size_t buffer_len = 0;
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// manifest has been appended to the end of the file.
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if (strcmp(manifest_path, filepath)==0){
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unsigned char marker[4];
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int ret=0;
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FILE *f = fopen(filepath, "r");
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if (f == NULL)
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return WHYF_perror("Could not open manifest file %s for reading.", filepath);
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if (fseek(f, -sizeof(marker), SEEK_END))
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ret=WHY_perror("Unable to seek to end of file");
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if (ret==0){
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ret = fread(marker, 1, sizeof(marker), f);
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if (ret==sizeof(marker))
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ret=0;
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else
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ret=WHY_perror("Unable to read end of manifest marker");
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}
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if (ret==0){
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if (marker[2]!=0x41 || marker[3]!=0x10)
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ret=WHYF("Expected 0x4110 marker at end of file");
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}
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if (ret==0){
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buffer_len = read_uint16(marker);
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if (buffer_len < 1 || buffer_len > MAX_MANIFEST_BYTES)
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ret=WHYF("Invalid manifest length %zu", buffer_len);
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}
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if (ret==0){
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if (fseek(f, -(buffer_len+sizeof(marker)), SEEK_END))
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ret=WHY_perror("Unable to seek to end of file");
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}
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if (ret==0){
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ret = fread(buffer, 1, buffer_len, f);
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if (ret==buffer_len)
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ret=0;
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else
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ret=WHY_perror("Unable to read manifest contents");
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}
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fclose(f);
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if (ret)
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return ret;
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manifest_path=(char*)buffer;
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}
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if (rhizome_read_manifest_file(m, manifest_path, buffer_len) == -1)
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return WHY("could not read manifest file");
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if (!rhizome_manifest_validate(m))
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return WHY("manifest is invalid");
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if (!rhizome_manifest_verify(m))
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return WHY("could not verify manifest");
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/* Do we already have this manifest or newer? */
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int64_t dbVersion = -1;
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if (sqlite_exec_int64(&dbVersion, "SELECT version FROM MANIFESTS WHERE id = ?;", RHIZOME_BID_T, &m->cryptoSignPublic, END) == -1)
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return WHY("Select failure");
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if (dbVersion>=m->version)
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return 2;
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int status = rhizome_import_file(m, filepath);
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if (status<0)
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return status;
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return rhizome_add_manifest(m, 1);
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}
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int rhizome_manifest_check_sanity(rhizome_manifest *m)
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{
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/* Ensure manifest meets basic sanity checks. */
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int ret = 0;
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if (m->version == 0)
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ret = WHY("Manifest must have a version number");
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if (m->filesize == RHIZOME_SIZE_UNSET)
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ret = WHY("Manifest missing 'filesize' field");
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else if (m->filesize && rhizome_filehash_t_is_zero(m->filehash))
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ret = WHY("Manifest 'filehash' field has not been set");
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if (m->service == NULL)
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ret = WHY("Manifest missing 'service' field");
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else if (strcasecmp(m->service, RHIZOME_SERVICE_FILE) == 0) {
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if (m->name == NULL)
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ret = WHY("Manifest with service='" RHIZOME_SERVICE_FILE "' missing 'name' field");
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} else if (strcasecmp(m->service, RHIZOME_SERVICE_MESHMS) == 0
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|| strcasecmp(m->service, RHIZOME_SERVICE_MESHMS2) == 0) {
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if (!m->has_sender)
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ret = WHYF("Manifest with service='%s' missing 'sender' field", m->service);
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if (!m->has_recipient)
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ret = WHYF("Manifest with service='%s' missing 'recipient' field", m->service);
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}
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else if (!rhizome_str_is_manifest_service(m->service))
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ret = WHYF("Manifest invalid 'service' field %s", alloca_str_toprint(m->service));
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if (!m->has_date)
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ret = WHY("Manifest missing 'date' field");
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return ret;
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}
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/* Sets the bundle key "BK" field of a manifest. Returns 1 if the field was set, 0 if not.
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*
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* This function must not be called unless the bundle secret is known.
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*
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* @author Andrew Bettison <andrew@servalproject.com>
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*/
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int rhizome_manifest_add_bundle_key(rhizome_manifest *m)
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{
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IN();
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assert(m->haveSecret);
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switch (m->authorship) {
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case ANONYMOUS: // there can be no BK field without an author
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case AUTHOR_UNKNOWN: // we already know the author is not in the keyring
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case AUTHENTICATION_ERROR: // already tried and failed to get Rhizome Secret
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break;
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case AUTHOR_NOT_CHECKED:
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case AUTHOR_LOCAL:
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case AUTHOR_AUTHENTIC:
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case AUTHOR_IMPOSTOR: {
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/* Set the BK using the provided author. Serval Security Framework defines BK as being:
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* BK = privateKey XOR sha512(RS##BID)
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* where BID = cryptoSignPublic,
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* 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)
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* so the same function can be used to encrypt and decrypt the BK field.
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*/
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const unsigned char *rs;
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size_t rs_len = 0;
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enum rhizome_secret_disposition d = find_rhizome_secret(&m->author, &rs_len, &rs);
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switch (d) {
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case FOUND_RHIZOME_SECRET: {
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rhizome_bk_t bkey;
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if (rhizome_secret2bk(&m->cryptoSignPublic, rs, rs_len, bkey.binary, m->cryptoSignSecret) == 0) {
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rhizome_manifest_set_bundle_key(m, &bkey);
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m->authorship = AUTHOR_AUTHENTIC;
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RETURN(1);
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} else
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m->authorship = AUTHENTICATION_ERROR;
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}
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break;
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case IDENTITY_NOT_FOUND:
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m->authorship = AUTHOR_UNKNOWN;
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break;
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case IDENTITY_HAS_NO_RHIZOME_SECRET:
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m->authorship = AUTHENTICATION_ERROR;
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break;
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default:
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FATALF("find_rhizome_secret() returned unknown code %d", (int)d);
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break;
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}
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}
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break;
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default:
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FATALF("m->authorship = %d", (int)m->authorship);
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}
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rhizome_manifest_del_bundle_key(m);
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switch (m->authorship) {
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case AUTHOR_UNKNOWN:
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WHYF("Cannot set BK because author=%s is not in keyring", alloca_tohex_sid_t(m->author));
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break;
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case AUTHENTICATION_ERROR:
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WHY("Cannot set BK due to error");
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break;
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default:
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break;
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}
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RETURN(0);
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}
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int rhizome_add_manifest(rhizome_manifest *m, int ttl)
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{
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if (config.debug.rhizome)
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DEBUGF("rhizome_add_manifest(m=%p, ttl=%d)",m, ttl);
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if (m->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->ttl = ttl < 0 ? 0 : ttl > 254 ? 254 : ttl;
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if (rhizome_manifest_check_sanity(m))
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return -1;
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assert(m->filesize != RHIZOME_SIZE_UNSET);
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if (m->filesize > 0 && !rhizome_exists(&m->filehash))
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return WHY("File has not been imported");
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/* If the manifest already has an ID */
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if (rhizome_bid_t_is_zero(m->cryptoSignPublic))
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return WHY("Manifest does not have an 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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int64_t storedversion = -1;
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switch (sqlite_exec_int64(&storedversion, "SELECT version FROM MANIFESTS WHERE id = ?;", RHIZOME_BID_T, &m->cryptoSignPublic, END)) {
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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 (config.debug.rhizome) DEBUG("No existing manifest");
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break;
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case 1:
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if (config.debug.rhizome)
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DEBUGF("Found existing version=%"PRId64", new version=%"PRId64, storedversion, m->version);
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if (m->version < storedversion)
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return WHY("Newer version exists");
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if (m->version == storedversion)
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return WHYF("Already have %s:%"PRId64", not adding", alloca_tohex_rhizome_bid_t(m->cryptoSignPublic), m->version);
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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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/* Okay, it is written, and can be put directly into the rhizome database now */
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return rhizome_store_bundle(m);
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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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