Allow Cipher and Digest "none".

[tinc] / src / protocol_auth.c

diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 1623e75..b8d4ee8 100644 (file)
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -1,7 +1,7 @@
 /*
     protocol_auth.c -- handle the meta-protocol, authentication
     Copyright (C) 1999-2005 Ivo Timmermans,
-                  2000-2013 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2014 Guus Sliepen <guus@tinc-vpn.org>
 
     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
@@ -26,6 +26,7 @@
 #include "control_common.h"
 #include "cipher.h"
 #include "crypto.h"
+#include "device.h"
 #include "digest.h"
 #include "ecdsa.h"
 #include "edge.h"
@@ -39,6 +40,7 @@
 #include "prf.h"
 #include "protocol.h"
 #include "rsa.h"
+#include "script.h"
 #include "sptps.h"
 #include "utils.h"
 #include "xalloc.h"
@@ -170,10 +172,28 @@ static bool finalize_invitation(connection_t *c, const char *data, uint16_t len)
                return false;
        }
 
-       fprintf(f, "ECDSAPublicKey = %s\n", data);
+       fprintf(f, "Ed25519PublicKey = %s\n", data);
        fclose(f);
 
        logger(DEBUG_CONNECTIONS, LOG_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
+
+       // Call invitation-accepted script
+       char *envp[7] = {NULL};
+       char *address, *port;
+
+       xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
+        xasprintf(&envp[1], "DEVICE=%s", device ? : "");
+        xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
+        xasprintf(&envp[3], "NODE=%s", c->name);
+       sockaddr2str(&c->address, &address, &port);
+       xasprintf(&envp[4], "REMOTEADDRESS=%s", address);
+       xasprintf(&envp[5], "NAME=%s", myself->name);
+
+       execute_script("invitation-accepted", envp);
+
+       for(int i = 0; envp[i] && i < 7; i++)
+               free(envp[i]);
+
        sptps_send_record(&c->sptps, 2, data, 0);
        return true;
 }
@@ -190,8 +210,19 @@ static bool receive_invitation_sptps(void *handle, uint8_t type, const char *dat
        if(type != 0 || len != 18 || c->status.invitation_used)
                return false;
 
+       // Recover the filename from the cookie and the key
+       digest_t *digest = digest_open_by_name("sha256", 18);
+       if(!digest)
+               abort();
+       char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
+       char hashbuf[18 + strlen(fingerprint)];
        char cookie[25];
-       b64encode_urlsafe(data, cookie, 18);
+       memcpy(hashbuf, data, 18);
+       memcpy(hashbuf + 18, fingerprint, sizeof hashbuf - 18);
+       digest_create(digest, hashbuf, sizeof hashbuf, cookie);
+       b64encode_urlsafe(cookie, cookie, 18);
+       digest_close(digest);
+       free(fingerprint);
 
        char filename[PATH_MAX], usedname[PATH_MAX];
        snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
@@ -348,13 +379,14 @@ bool id_h(connection_t *c, const char *request) {
                }
 
                if(experimental)
-                       read_ecdsa_public_key(c);
+                       if(!read_ecdsa_public_key(c))
+                               return false;
        } else {
                if(c->protocol_minor && !ecdsa_active(c->ecdsa))
                        c->protocol_minor = 1;
        }
 
-       /* Forbid version rollback for nodes whose ECDSA key we know */
+       /* Forbid version rollback for nodes whose Ed25519 key we know */
 
        if(ecdsa_active(c->ecdsa) && c->protocol_minor < 2) {
                logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
@@ -482,14 +514,22 @@ bool metakey_h(connection_t *c, const char *request) {
 
        /* Check and lookup cipher and digest algorithms */
 
-       if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
-               logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
-               return false;
+       if(cipher) {
+               if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
+                       logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
+                       return false;
+               }
+       } else {
+               c->incipher = NULL;
        }
 
-       if(!(c->indigest = digest_open_by_nid(digest, -1))) {
-               logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
-               return false;
+       if(digest) {
+               if(!(c->indigest = digest_open_by_nid(digest, -1))) {
+                       logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
+                       return false;
+               }
+       } else {
+               c->indigest = NULL;
        }
 
        c->status.decryptin = true;
@@ -597,7 +637,7 @@ bool chal_reply_h(connection_t *c, const char *request) {
 }
 
 static bool send_upgrade(connection_t *c) {
-       /* Special case when protocol_minor is 1: the other end is ECDSA capable,
+       /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
         * but doesn't know our key yet. So send it now. */
 
        char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
@@ -641,7 +681,8 @@ bool send_ack(connection_t *c) {
        if(choice)
                c->options |= OPTION_CLAMP_MSS;
 
-       get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
+       if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight))
+               get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
 
        return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
 }
@@ -685,12 +726,12 @@ static bool upgrade_h(connection_t *c, const char *request) {
        }
 
        if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(c)) {
-               logger(DEBUG_ALWAYS, LOG_INFO, "Already have ECDSA public key from %s (%s), not upgrading.", c->name, c->hostname);
+               logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
                return false;
        }
 
-       logger(DEBUG_ALWAYS, LOG_INFO, "Got ECDSA public key from %s (%s), upgrading!", c->name, c->hostname);
-       append_config_file(c->name, "ECDSAPublicKey", pubkey);
+       logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
+       append_config_file(c->name, "Ed25519PublicKey", pubkey);
        c->allow_request = TERMREQ;
        return send_termreq(c);
 }