X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Finvitation.c;h=1fba77e15f3c1e4099ef2e7c6be33e0e8aef7b4f;hb=bd64dba29c465b016ac1d2fb53f2bf09f8feaddd;hp=bd1fb94022f95d1f470613b75e64219044fe3bd0;hpb=d6a67266c812a85f11c734503ae5560ab8983edb;p=meshlink

diff --git a/src/invitation.c b/src/invitation.c
index bd1fb940..1fba77e1 100644
--- a/src/invitation.c
+++ b/src/invitation.c
@@ -1,6 +1,6 @@
 /*
     invitation.c -- Create and accept invitations
-    Copyright (C) 2013 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
 
     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
@@ -24,65 +24,68 @@
 #include "ecdsa.h"
 #include "ecdsagen.h"
 #include "invitation.h"
-#include "names.h"
 #include "netutl.h"
-#include "rsagen.h"
 #include "sptps.h"
 #include "tincctl.h"
 #include "utils.h"
 #include "xalloc.h"
 
-#ifdef HAVE_MINGW
-#define SCRIPTEXTENSION ".bat"
-#else
-#define SCRIPTEXTENSION ""
-#endif
-
 int addressfamily = AF_UNSPEC;
 
+static void scan_for_hostname(const char *filename, char **hostname, char **port) {
+	if(!filename || (*hostname && *port))
+		return;
+
+	FILE *f = fopen(filename, "r");
+	if(!f)
+		return;
+
+	while(fgets(line, sizeof line, f)) {
+		if(!rstrip(line))
+			continue;
+		char *p = line, *q;
+		p += strcspn(p, "\t =");
+		if(!*p)
+			continue;
+		q = p + strspn(p, "\t ");
+		if(*q == '=')
+			q += 1 + strspn(q + 1, "\t ");
+		*p = 0;
+		p = q + strcspn(q, "\t ");
+		if(*p)
+			*p++ = 0;
+		p += strspn(p, "\t ");
+		p[strcspn(p, "\t ")] = 0;
+
+		if(!*port && !strcasecmp(line, "Port")) {
+			*port = xstrdup(q);
+		} else if(!*hostname && !strcasecmp(line, "Address")) {
+			*hostname = xstrdup(q);
+			if(*p) {
+				free(*port);
+				*port = xstrdup(p);
+			}
+		}
+
+		if(*hostname && *port)
+			break;
+	}
+
+	fclose(f);
+}
+
 char *get_my_hostname() {
 	char *hostname = NULL;
 	char *port = NULL;
 	char *hostport = NULL;
 	char *name = get_my_name(false);
-	char *filename = NULL;
+	char filename[PATH_MAX];
 
 	// Use first Address statement in own host config file
 	if(check_id(name)) {
-		xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
-		FILE *f = fopen(filename, "r");
-		if(f) {
-			while(fgets(line, sizeof line, f)) {
-				if(!rstrip(line))
-					continue;
-				char *p = line, *q;
-				p += strcspn(p, "\t =");
-				if(!*p)
-					continue;
-				q = p + strspn(p, "\t ");
-				if(*q == '=')
-					q += 1 + strspn(q + 1, "\t ");
-				*p = 0;
-				p = q + strcspn(q, "\t ");
-				if(*p)
-					*p++ = 0;
-				p += strspn(p, "\t ");
-				p[strcspn(p, "\t ")] = 0;
-				if(!port && !strcasecmp(line, "Port")) {
-					port = xstrdup(q);
-					continue;
-				}
-				if(strcasecmp(line, "Address"))
-					continue;
-				hostname = xstrdup(q);
-				if(*p) {
-					free(port);
-					port = xstrdup(p);
-				}
-				break;
-			}
-			fclose(f);
-		}
+		snprintf(filename,PATH_MAX, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+		scan_for_hostname(filename, &hostname, &port);
+		scan_for_hostname(tinc_conf, &hostname, &port);
 	}
 
 	if(hostname)
@@ -90,12 +93,14 @@ char *get_my_hostname() {
 
 	// If that doesn't work, guess externally visible hostname
 	fprintf(stderr, "Trying to discover externally visible hostname...\n");
-	struct addrinfo *ai = str2addrinfo("ifconfig.me", "80", SOCK_STREAM);
-	static const char request[] = "GET /host HTTP/1.0\r\n\r\n";
-	if(ai) {
-		int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+	struct addrinfo *ai = str2addrinfo("tinc-vpn.org", "80", SOCK_STREAM);
+	struct addrinfo *aip = ai;
+	static const char request[] = "GET http://tinc-vpn.org/host.cgi HTTP/1.0\r\n\r\n";
+
+	while(aip) {
+		int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
 		if(s >= 0) {
-			if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
+			if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
 				closesocket(s);
 				s = -1;
 			}
@@ -112,14 +117,20 @@ char *get_my_hostname() {
 					hostname = xstrdup(p + 1);
 			}
 			closesocket(s);
+			if(hostname)
+				break;
 		}
-		freeaddrinfo(ai);
+		aip = aip->ai_next;
+		continue;
 	}
 
+	if(ai)
+		freeaddrinfo(ai);
+
 	// Check that the hostname is reasonable
 	if(hostname) {
 		for(char *p = hostname; *p; p++) {
-			if(isalnum(*p) || *p == '-' || *p == '.')
+			if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
 				continue;
 			// If not, forget it.
 			free(hostname);
@@ -128,12 +139,19 @@ char *get_my_hostname() {
 		}
 	}
 
+	if(!tty) {
+		if(!hostname) {
+			fprintf(stderr, "Could not determine the external address or hostname. Please set Address manually.\n");
+			return NULL;
+		}
+		goto save;
+	}
+
 again:
-	printf("Please enter your host's external address or hostname");
+	fprintf(stderr, "Please enter your host's external address or hostname");
 	if(hostname)
-		printf(" [%s]", hostname);
-	printf(": ");
-	fflush(stdout);
+		fprintf(stderr, " [%s]", hostname);
+	fprintf(stderr, ": ");
 
 	if(!fgets(line, sizeof line, stdin)) {
 		fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
@@ -176,13 +194,14 @@ done:
 		else
 			xasprintf(&hostport, "%s:%s", hostname, port);
 	} else {
-		hostport = hostname;
-		hostname = NULL;
+		if(strchr(hostname, ':'))
+			xasprintf(&hostport, "[%s]", hostname);
+		else
+			hostport = xstrdup(hostname);
 	}
 
 	free(hostname);
 	free(port);
-	free(filename);
 	return hostport;
 }
 
@@ -218,14 +237,12 @@ int cmd_invite(int argc, char *argv[]) {
 		return 1;
 
 	// Ensure no host configuration file with that name exists
-	char *filename = NULL;
-	xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, argv[1]);
+	char filename [PATH_MAX];
+	snprintf(filename,PATH_MAX, "%s" SLASH "hosts" SLASH "%s", confbase, argv[1]);
 	if(!access(filename, F_OK)) {
-		free(filename);
 		fprintf(stderr, "A host config file for %s already exists!\n", argv[1]);
 		return 1;
 	}
-	free(filename);
 
 	// If a daemon is running, ensure no other nodes now about this name
 	bool found = false;
@@ -247,12 +264,11 @@ int cmd_invite(int argc, char *argv[]) {
 		}
 	}
 
-	char hash[25];
+	char hash[64];
 
-	xasprintf(&filename, "%s" SLASH "invitations", confbase);
+	snprintf(filename,PATH_MAX, "%s" SLASH "invitations", confbase);
 	if(mkdir(filename, 0700) && errno != EEXIST) {
 		fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno));
-		free(filename);
 		return 1;
 	}
 
@@ -260,7 +276,6 @@ int cmd_invite(int argc, char *argv[]) {
 	DIR *dir = opendir(filename);
 	if(!dir) {
 		fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno));
-		free(filename);
 		return 1;
 	}
 
@@ -272,9 +287,9 @@ int cmd_invite(int argc, char *argv[]) {
 	while((ent = readdir(dir))) {
 		if(strlen(ent->d_name) != 24)
 			continue;
-		char *invname;
+		char invname[PATH_MAX];
 		struct stat st;
-		xasprintf(&invname, "%s" SLASH "%s", filename, ent->d_name);
+		snprintf(invname,PATH_MAX, "%s" SLASH "%s", filename, ent->d_name);
 		if(!stat(invname, &st)) {
 			if(deadline < st.st_mtime)
 				count++;
@@ -284,21 +299,18 @@ int cmd_invite(int argc, char *argv[]) {
 			fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno));
 			errno = 0;
 		}
-		free(invname);
 	}
 
 	if(errno) {
 		fprintf(stderr, "Error while reading directory %s: %s\n", filename, strerror(errno));
 		closedir(dir);
-		free(filename);
 		return 1;
 	}
 		
 	closedir(dir);
-	free(filename);
 
 	ecdsa_t *key;
-	xasprintf(&filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
+	snprintf(filename,PATH_MAX, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 
 	// Remove the key if there are no outstanding invitations.
 	if(!count)
@@ -309,77 +321,100 @@ int cmd_invite(int argc, char *argv[]) {
 	if(!f) {
 		if(errno != ENOENT) {
 			fprintf(stderr, "Could not read %s: %s\n", filename, strerror(errno));
-			free(filename);
 			return 1;
 		}
 
 		key = ecdsa_generate();
 		if(!key) {
-			free(filename);
 			return 1;
 		}
 		f = fopen(filename, "w");
 		if(!f) {
 			fprintf(stderr, "Could not write %s: %s\n", filename, strerror(errno));
-			free(filename);
 			return 1;
 		}
 		chmod(filename, 0600);
 		ecdsa_write_pem_private_key(key, f);
+		fclose(f);
+
+		if(connect_tincd(false))
+			sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 	} else {
 		key = ecdsa_read_pem_private_key(f);
+		fclose(f);
 		if(!key)
 			fprintf(stderr, "Could not read private key from %s\n", filename);
 	}
-	fclose(f);
-	free(filename);
+
 	if(!key)
 		return 1;
 
 	// Create a hash of the key.
 	char *fingerprint = ecdsa_get_base64_public_key(key);
-	digest_t *digest = digest_open_by_name("sha256", 18);
-	if(!digest)
-		abort();
-	digest_create(digest, fingerprint, strlen(fingerprint), hash);
+	sha512(fingerprint, strlen(fingerprint), hash);
 	b64encode_urlsafe(hash, hash, 18);
 
 	// Create a random cookie for this invitation.
 	char cookie[25];
 	randomize(cookie, 18);
+
+	// Create a filename that doesn't reveal the cookie itself
+	char buf[18 + strlen(fingerprint)];
+	char cookiehash[64];
+	memcpy(buf, cookie, 18);
+	memcpy(buf + 18, fingerprint, sizeof buf - 18);
+	sha512(buf, sizeof buf, cookiehash);
+	b64encode_urlsafe(cookiehash, cookiehash, 18);
+
 	b64encode_urlsafe(cookie, cookie, 18);
 
 	// Create a file containing the details of the invitation.
-	xasprintf(&filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
+	snprintf(filename,PATH_MAX, "%s" SLASH "invitations" SLASH "%s", confbase, cookiehash);
 	int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
 	if(!ifd) {
 		fprintf(stderr, "Could not create invitation file %s: %s\n", filename, strerror(errno));
-		free(filename);
 		return 1;
 	}
-	free(filename);
 	f = fdopen(ifd, "w");
 	if(!f)
 		abort();
 
+	// Get the local address
+	char *address = get_my_hostname();
+
 	// Fill in the details.
 	fprintf(f, "Name = %s\n", argv[1]);
 	if(netname)
 		fprintf(f, "NetName = %s\n", netname);
 	fprintf(f, "ConnectTo = %s\n", myname);
-	// TODO: copy Broadcast and Mode
+
+	// Copy Broadcast and Mode
+	FILE *tc = fopen(tinc_conf, "r");
+	if(tc) {
+		char buf[1024];
+		while(fgets(buf, sizeof buf, tc)) {
+			if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
+					|| (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
+				fputs(buf, f);
+				// Make sure there is a newline character.
+				if(!strchr(buf, '\n'))
+					fputc('\n', f);
+			}
+		}
+		fclose(tc);
+	}
+
 	fprintf(f, "#---------------------------------------------------------------#\n");
 	fprintf(f, "Name = %s\n", myname);
 
-	xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, myname);
-	fcopy(f, filename);
+	char filename2[PATH_MAX];
+	snsprintf(filename2,PATH_MAX, "%s" SLASH "hosts" SLASH "%s", confbase, myname);
+	fcopy(f, filename2);
 	fclose(f);
 
 	// Create an URL from the local address, key hash and cookie
-	char *address = get_my_hostname();
-	printf("%s/%s%s\n", address, hash, cookie);
-	free(filename);
-	free(address);
+	char *url;
+	xasprintf(&url, "%s/%s%s", address, hash, cookie);
 
 	return 0;
 }
@@ -490,14 +525,10 @@ static bool finalize_join(void) {
 	if(!netname)
 		netname = grep(data, "NetName");
 
-make_names:
-	if(!confbasegiven) {
-		free(confbase);
-		confbase = NULL;
-	}
-
-	make_names();
+	bool ask_netname = false;
+	char temp_netname[32];
 
+make_names:
 	free(tinc_conf);
 	free(hosts_dir);
 
@@ -506,28 +537,22 @@ make_names:
 
 	if(!access(tinc_conf, F_OK)) {
 		fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
-		if(!tty || confbasegiven)
+		if(confbasegiven)
 			return false;
-ask_netname:
-		fprintf(stderr, "Enter a new netname: ");
-		if(!fgets(line, sizeof line, stdin)) {
-			fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
-			return false;
-		}
-		if(!*line || *line == '\n')
-			goto ask_netname;
 
-		line[strlen(line) - 1] = 0;
-		netname = line;
+		// Generate a random netname, ask for a better one later.
+		ask_netname = true;
+		snprintf(temp_netname, sizeof temp_netname, "join_%x", rand());
+		netname = temp_netname;
 		goto make_names;
 	}	
 
-	if(mkdir(confbase, 0755) && errno != EEXIST) {
+	if(mkdir(confbase, 0777) && errno != EEXIST) {
 		fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
 		return false;
 	}
 
-	if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
+	if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
 		fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
 		return false;
 	}
@@ -540,8 +565,8 @@ ask_netname:
 
 	fprintf(f, "Name = %s\n", name);
 
-	char *filename;
-	xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
+	char filename[PATH_MAX];
+	snprintf(filename,PATH_MAX, "%s" SLASH "%s", hosts_dir, name);
 	FILE *fh = fopen(filename, "w");
 	if(!fh) {
 		fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
@@ -601,7 +626,6 @@ ask_netname:
 	}
 
 	fclose(f);
-	free(filename);
 
 	while(l && !strcasecmp(l, "Name")) {
 		if(!check_id(value)) {
@@ -614,7 +638,7 @@ ask_netname:
 			return false;
 		}
 
-		xasprintf(&filename, "%s" SLASH "%s", hosts_dir, value);
+		snprintf(filename,PATH_MAX, "%s" SLASH "%s", hosts_dir, value);
 		f = fopen(filename, "w");
 
 		if(!f) {
@@ -642,7 +666,6 @@ ask_netname:
 		}
 
 		fclose(f);
-		free(filename);
 	}
 
 	// Generate our key and send a copy to the server
@@ -654,13 +677,8 @@ ask_netname:
 	if(!b64key)
 		return false;
 
-	xasprintf(&filename, "%s" SLASH "ecdsa_key.priv", confbase);
-	f = fopen(filename, "w");
-
-#ifdef HAVE_FCHMOD
-	/* Make it unreadable for others. */
-	fchmod(fileno(f), 0600);
-#endif
+	snprintf(filename,PATH_MAX, "%s" SLASH "ecdsa_key.priv", confbase);
+	f = fopenmask(filename, "w", 0600);
 
 	if(!ecdsa_write_pem_private_key(key, f)) {
 		fprintf(stderr, "Error writing private key!\n");
@@ -676,32 +694,40 @@ ask_netname:
 	sptps_send_record(&sptps, 1, b64key, strlen(b64key));
 	free(b64key);
 
+	ecdsa_free(key);
 
-	rsa_t *rsa = rsa_generate(2048, 0x1001);
-	xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
-	f = fopen(filename, "w");
+	check_port(name);
 
-#ifdef HAVE_FCHMOD
-	/* Make it unreadable for others. */
-	fchmod(fileno(f), 0600);
-#endif
+ask_netname:
+	if(ask_netname && tty) {
+		fprintf(stderr, "Enter a new netname: ");
+		if(!fgets(line, sizeof line, stdin)) {
+			fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
+			return false;
+		}
+		if(!*line || *line == '\n')
+			goto ask_netname;
 
-	rsa_write_pem_private_key(rsa, f);
-	fclose(f);
+		line[strlen(line) - 1] = 0;
 
-	rsa_write_pem_public_key(rsa, fh);
-	fclose(fh);
+		char *newbase;
+		xasprintf(&newbase, CONFDIR SLASH "tinc" SLASH "%s", line);
+		if(rename(confbase, newbase)) {
+			fprintf(stderr, "Error trying to rename %s to %s: %s\n", confbase, newbase, strerror(errno));
+			free(newbase);
+			goto ask_netname;
+		}
 
-	ecdsa_free(key);
-	rsa_free(rsa);
+		free(newbase);
+		netname = line;
+	}
 
-	fprintf(stderr, "Invitation succesfully accepted.\n");
-	shutdown(sock, SHUT_RDWR);
-	success = true;
+	fprintf(stderr, "Configuration stored in: %s\n", confbase);
 
 	return true;
 }
 
+
 static bool invitation_send(void *handle, uint8_t type, const char *data, size_t len) {
 	while(len) {
 		int result = send(sock, data, len, 0);
@@ -730,6 +756,12 @@ static bool invitation_receive(void *handle, uint8_t type, const char *msg, uint
 		case 1:
 			return finalize_join();
 
+		case 2:
+			fprintf(stderr, "Invitation succesfully accepted.\n");
+			shutdown(sock, SHUT_RDWR);
+			success = true;
+			break;
+
 		default:
 			return false;
 	}
@@ -747,9 +779,20 @@ int cmd_join(int argc, char *argv[]) {
 		return 1;
 	}
 
-	// Make sure confdir exists.
-	if(mkdir(confdir, 0755) && errno != EEXIST) {
-		fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
+	// Make sure confbase exists and is accessible.
+	if(mkdir(confbase, 0777) && errno != EEXIST) {
+		fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
+		return 1;
+	}
+
+	if(access(confbase, R_OK | W_OK | X_OK)) {
+		fprintf(stderr, "No permission to write in directory %s: %s\n", confbase, strerror(errno));
+		return 1;
+	}
+
+	// If a netname or explicit configuration directory is specified, check for an existing tinc.conf.
+	if((netname || confbasegiven) && !access(tinc_conf, F_OK)) {
+		fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
 		return 1;
 	}
 
@@ -759,10 +802,8 @@ int cmd_join(int argc, char *argv[]) {
 	if(argc > 1) {
 		invitation = argv[1];
 	} else {
-		if(tty) {
-			printf("Enter invitation URL: ");
-			fflush(stdout);
-		}
+		if(tty)
+			fprintf(stderr, "Enter invitation URL: ");
 		errno = EPIPE;
 		if(!fgets(line, sizeof line, stdin)) {
 			fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
@@ -851,14 +892,11 @@ int cmd_join(int argc, char *argv[]) {
 		return 1;
 	}
 
-	// Check if the hash of the key he have us matches the hash in the URL.
+	// Check if the hash of the key he gave us matches the hash in the URL.
 	char *fingerprint = line + 2;
-	digest_t *digest = digest_open_by_name("sha256", 18);
-	if(!digest)
-		abort();
-	char hishash[18];
-	if(!digest_create(digest, fingerprint, strlen(fingerprint), hishash)) {
-		fprintf(stderr, "Could not create digest\n%s\n", line + 2);
+	char hishash[64];
+	if(!sha512(fingerprint, strlen(fingerprint), hishash)) {
+		fprintf(stderr, "Could not create hash\n%s\n", line + 2);
 		return 1;
 	}
 	if(memcmp(hishash, hash, 18)) {