--- /dev/null
+/*
+ * keydb_hkp.c - Routines to store and fetch keys from another keyserver.
+ *
+ * Copyright 2013 Jonathan McDowell <noodles@earth.li>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <curl/curl.h>
+
+#include "build-config.h"
+
+#include "armor.h"
+#include "charfuncs.h"
+#include "keydb.h"
+#include "keystructs.h"
+#include "log.h"
+#include "mem.h"
+#include "onak-conf.h"
+#include "parsekey.h"
+
+struct onak_hkp_dbctx {
+ struct onak_db_config *config; /* Our DB config info */
+ CURL *curl;
+ char hkpbase[512];
+};
+
+static int hkp_parse_url(struct onak_hkp_dbctx *privctx, const char *url)
+{
+ char proto[6], host[256];
+ unsigned int port;
+ int matched;
+ int ret = 1;
+
+ proto[0] = host[0] = 0;
+ port = 0;
+
+ matched = sscanf(url, "%5[a-z]://%256[a-zA-Z0-9.-]:%u", proto, host,
+ &port);
+ if (matched < 2) {
+ proto[0] = 0;
+ sscanf(url, "%256[a-zA-Z0-9.-]:%u", host, &port);
+ }
+
+ if (host[0] == 0) {
+ logthing(LOGTHING_CRITICAL, "Couldn't parse HKP host: %s",
+ url);
+ ret = 0;
+ goto out;
+ }
+
+ if (proto[0] == 0 || !strcmp(proto, "hkp")) {
+ if (port == 0) {
+ port = 11371;
+ }
+ snprintf(privctx->hkpbase, sizeof(privctx->hkpbase),
+ "http://%s:%u/pks", host, port);
+ } else if (!strcmp(proto, "hkps")) {
+ if (port == 0) {
+ port = 11372;
+ }
+ snprintf(privctx->hkpbase, sizeof(privctx->hkpbase),
+ "https://%s:%u/pks", host, port);
+ } else if (strcmp(proto, "http") && strcmp(proto, "https")) {
+ logthing(LOGTHING_CRITICAL, "Unknown HKP protocol: %s",
+ proto);
+ ret = 0;
+ goto out;
+ } else if (port == 0) {
+ snprintf(privctx->hkpbase, sizeof(privctx->hkpbase),
+ "%s://%s/pks", proto, host);
+ } else {
+ snprintf(privctx->hkpbase, sizeof(privctx->hkpbase),
+ "%s://%s:%u/pks", proto, host, port);
+ }
+
+out:
+ return ret;
+}
+
+/**
+ * Receive data from a CURL request and process it into a buffer context.
+ */
+static size_t hkp_curl_recv_data(void *buffer, size_t size, size_t nmemb,
+ void *ctx)
+{
+ buffer_putchar(ctx, nmemb * size, buffer);
+
+ return (nmemb * size);
+}
+
+static int hkp_fetch_key_url(struct onak_dbctx *dbctx,
+ char *url,
+ struct openpgp_publickey **publickey,
+ bool intrans)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+ struct openpgp_packet_list *packets = NULL;
+ CURLcode res;
+ struct buffer_ctx buf;
+ int count = 0;
+
+ buf.offset = 0;
+ buf.size = 8192;
+ buf.buffer = malloc(8192);
+
+ curl_easy_setopt(privctx->curl, CURLOPT_URL, url);
+ curl_easy_setopt(privctx->curl, CURLOPT_WRITEFUNCTION,
+ hkp_curl_recv_data);
+ curl_easy_setopt(privctx->curl, CURLOPT_WRITEDATA, &buf);
+ res = curl_easy_perform(privctx->curl);
+
+ if (res == 0) {
+ buf.offset = 0;
+ dearmor_openpgp_stream(buffer_fetchchar, &buf, &packets);
+ count = parse_keys(packets, publickey);
+ free_packet_list(packets);
+ packets = NULL;
+ } else {
+ logthing(LOGTHING_ERROR, "Couldn't find key: %s (%d)",
+ curl_easy_strerror(res), res);
+ }
+
+ free(buf.buffer);
+ buf.offset = buf.size = 0;
+ buf.buffer = NULL;
+
+ return count;
+}
+
+/**
+ * hkp_fetch_key_id - Given a keyid fetch the key from HKP server.
+ */
+static int hkp_fetch_key_id(struct onak_dbctx *dbctx,
+ uint64_t keyid,
+ struct openpgp_publickey **publickey,
+ bool intrans)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+ char keyurl[1024];
+
+ snprintf(keyurl, sizeof(keyurl),
+ "%s/lookup?op=get&search=0x%08" PRIX64,
+ privctx->hkpbase, keyid);
+
+ return (hkp_fetch_key_url(dbctx, keyurl, publickey, intrans));
+}
+
+/**
+ * hkp_fetch_key_fp - Given a fingerprint fetch the key from HKP server.
+ */
+static int hkp_fetch_key_fp(struct onak_dbctx *dbctx,
+ struct openpgp_fingerprint *fingerprint,
+ struct openpgp_publickey **publickey,
+ bool intrans)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+ char keyurl[1024];
+ int i, ofs;
+
+ if (fingerprint->length > MAX_FINGERPRINT_LEN) {
+ return 0;
+ }
+
+ ofs = snprintf(keyurl, sizeof(keyurl),
+ "%s/lookup?op=get&search=0x", privctx->hkpbase);
+
+ if ((ofs + fingerprint->length * 2 + 1)> sizeof(keyurl)) {
+ return 0;
+ }
+
+ for (i = 0; i < fingerprint->length; i++) {
+ ofs += sprintf(&keyurl[ofs], "%02X", fingerprint->fp[i]);
+ }
+
+ return (hkp_fetch_key_url(dbctx, keyurl, publickey, intrans));
+}
+
+/**
+ * fetch_key_text - Tries to find the keys that contain the supplied text.
+ * @search: The text to search for.
+ * @publickey: A pointer to a structure to return the key in.
+ *
+ * This function searches for the supplied text and returns the keys that
+ * contain it.
+ *
+ * TODO: Write for flat file access. Some sort of grep?
+ */
+static int hkp_fetch_key_text(struct onak_dbctx *dbctx,
+ const char *search,
+ struct openpgp_publickey **publickey)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+ char keyurl[1024];
+
+ snprintf(keyurl, sizeof(keyurl),
+ "%s/lookup?op=get&search=%s",
+ privctx->hkpbase, search);
+
+ return (hkp_fetch_key_url(dbctx, keyurl, publickey, false));
+}
+
+/**
+ * store_key - Takes a key and stores it.
+ * @publickey: A pointer to the public key to store.
+ * @intrans: If we're already in a transaction.
+ * @update: If true the key exists and should be updated.
+ *
+ */
+static int hkp_store_key(struct onak_dbctx *dbctx,
+ struct openpgp_publickey *publickey, bool intrans,
+ bool update)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+ struct openpgp_packet_list *packets = NULL;
+ struct openpgp_packet_list *list_end = NULL;
+ char keyurl[1024];
+ CURLcode res;
+ struct buffer_ctx buf;
+ char *addform;
+
+ buf.offset = 0;
+ buf.size = 8192;
+ buf.buffer = malloc(8192);
+ buf.offset = snprintf(buf.buffer, buf.size, "keytextz");
+
+ flatten_publickey(publickey, &packets, &list_end);
+ armor_openpgp_stream(buffer_putchar, &buf, packets);
+ addform = curl_easy_escape(privctx->curl, buf.buffer, buf.offset);
+ addform[7] = '=';
+
+ snprintf(keyurl, sizeof(keyurl), "%s/add", privctx->hkpbase);
+
+ curl_easy_setopt(privctx->curl, CURLOPT_URL, keyurl);
+ curl_easy_setopt(privctx->curl, CURLOPT_POSTFIELDS, addform);
+ curl_easy_setopt(privctx->curl, CURLOPT_WRITEFUNCTION,
+ hkp_curl_recv_data);
+ buf.offset = 0;
+ curl_easy_setopt(privctx->curl, CURLOPT_WRITEDATA, &buf);
+ res = curl_easy_perform(privctx->curl);
+
+ if (res != 0) {
+ logthing(LOGTHING_ERROR, "Couldn't send key: %s (%d)",
+ curl_easy_strerror(res), res);
+ }
+
+ curl_free(addform);
+
+ /* TODO: buf has any response text we might want to parse. */
+ free(buf.buffer);
+ buf.offset = buf.size = 0;
+ buf.buffer = NULL;
+
+ return (res == 0) ? 1 : 0;
+}
+
+/**
+ * delete_key - Given a keyid delete the key from storage.
+ * @fp: The fingerprint of the key to delete.
+ * @intrans: If we're already in a transaction.
+ *
+ * No op for HKP.
+ */
+static int hkp_delete_key(struct onak_dbctx *dbctx,
+ struct openpgp_fingerprint *fp, bool intrans)
+{
+ return -1;
+}
+
+/**
+ * iterate_keys - call a function once for each key in the db.
+ * @iterfunc: The function to call.
+ * @ctx: A context pointer
+ *
+ * Not applicable for HKP backend.
+ */
+static int hkp_iterate_keys(struct onak_dbctx *dbctx,
+ void (*iterfunc)(void *ctx, struct openpgp_publickey *key),
+ void *ctx)
+{
+ return 0;
+}
+
+/**
+ * starttrans - Start a transaction.
+ *
+ * This is just a no-op for HKP access.
+ */
+static bool hkp_starttrans(struct onak_dbctx *dbctx)
+{
+ return true;
+}
+
+/**
+ * endtrans - End a transaction.
+ *
+ * This is just a no-op for HKP access.
+ */
+static void hkp_endtrans(struct onak_dbctx *dbctx)
+{
+ return;
+}
+
+/*
+ * Include the basic keydb routines.
+ */
+#define NEED_KEYID2UID 1
+#define NEED_GETKEYSIGS 1
+#define NEED_UPDATEKEYS 1
+#include "keydb.c"
+
+/**
+ * cleanupdb - De-initialize the key database.
+ *
+ * We cleanup CURL here.
+ */
+static void hkp_cleanupdb(struct onak_dbctx *dbctx)
+{
+ struct onak_hkp_dbctx *privctx = (struct onak_hkp_dbctx *) dbctx->priv;
+
+ if (privctx->curl) {
+ curl_easy_cleanup(privctx->curl);
+ privctx->curl = NULL;
+ }
+ curl_global_cleanup();
+ free(privctx);
+ free(dbctx);
+}
+
+/**
+ * initdb - Initialize the key database.
+ *
+ * We initialize CURL here.
+ */
+struct onak_dbctx *keydb_hkp_init(struct onak_db_config *dbcfg, bool readonly)
+{
+ struct onak_dbctx *dbctx;
+ struct onak_hkp_dbctx *privctx;
+ curl_version_info_data *curl_info;
+
+ dbctx = malloc(sizeof(struct onak_dbctx));
+ if (dbctx == NULL) {
+ return NULL;
+ }
+
+ dbctx->config = dbcfg;
+ dbctx->priv = privctx = malloc(sizeof(*privctx));
+ dbctx->cleanupdb = hkp_cleanupdb;
+ dbctx->starttrans = hkp_starttrans;
+ dbctx->endtrans = hkp_endtrans;
+ dbctx->fetch_key_id = hkp_fetch_key_id;
+ dbctx->fetch_key_fp = hkp_fetch_key_fp;
+ dbctx->fetch_key_text = hkp_fetch_key_text;
+ dbctx->store_key = hkp_store_key;
+ dbctx->update_keys = generic_update_keys;
+ dbctx->delete_key = hkp_delete_key;
+ dbctx->getkeysigs = generic_getkeysigs;
+ dbctx->cached_getkeysigs = generic_cached_getkeysigs;
+ dbctx->keyid2uid = generic_keyid2uid;
+ dbctx->iterate_keys = hkp_iterate_keys;
+
+ if (!hkp_parse_url(privctx, dbcfg->location)) {
+ exit(EXIT_FAILURE);
+ }
+ logthing(LOGTHING_INFO, "Using %s as HKP forwarding URL.",
+ privctx->hkpbase);
+ curl_global_init(CURL_GLOBAL_DEFAULT);
+ privctx->curl = curl_easy_init();
+ if (privctx->curl == NULL) {
+ logthing(LOGTHING_CRITICAL, "Could not initialize CURL.");
+ hkp_cleanupdb(dbctx);
+ dbctx = NULL;
+ exit(EXIT_FAILURE);
+ }
+ curl_easy_setopt(privctx->curl, CURLOPT_USERAGENT,
+ "onak/" ONAK_VERSION);
+
+ if (strncmp(privctx->hkpbase, "https://", 8) == 0) {
+ curl_info = curl_version_info(CURLVERSION_NOW);
+ if (! (curl_info->features & CURL_VERSION_SSL)) {
+ logthing(LOGTHING_CRITICAL,
+ "CURL lacks SSL support; cannot use HKP url: %s",
+ privctx->hkpbase);
+ hkp_cleanupdb(dbctx);
+ dbctx = NULL;
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ return dbctx;
+}
projects / onak.git / blobdiff