X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Ftincctl.c;h=9687ba4b7db81259be782678b64cebae16ae5103;hp=2fe4e790839a301e4a8cca7821523a1626c56b4f;hb=c2dc3784f127ef6db6e9960a4abecc1aab6f4e31;hpb=a1f4f14c6c5e269c901e6e019418fb8f789cf96b diff --git a/src/tincctl.c b/src/tincctl.c index 2fe4e790..9687ba4b 100644 --- a/src/tincctl.c +++ b/src/tincctl.c @@ -1,6 +1,6 @@ /* tincctl.c -- Controlling a running tincd - Copyright (C) 2007-2013 Guus Sliepen + Copyright (C) 2007-2015 Guus Sliepen 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 @@ -31,6 +31,7 @@ #include "control_common.h" #include "crypto.h" #include "ecdsagen.h" +#include "fsck.h" #include "info.h" #include "invitation.h" #include "names.h" @@ -38,11 +39,10 @@ #include "utils.h" #include "tincctl.h" #include "top.h" +#include "version.h" -#ifdef HAVE_MINGW -#define SCRIPTEXTENSION ".bat" -#else -#define SCRIPTEXTENSION "" +#ifndef MSG_NOSIGNAL +#define MSG_NOSIGNAL 0 #endif static char **orig_argv; @@ -67,16 +67,16 @@ char line[4096]; static int code; static int req; static int result; -static bool force = false; +bool force = false; bool tty = true; bool confbasegiven = false; bool netnamegiven = false; - -#ifdef HAVE_MINGW -static struct WSAData wsa_state; -#endif +char *scriptinterpreter = NULL; +char *scriptextension = ""; +static char *prompt; static struct option const long_options[] = { + {"batch", no_argument, NULL, 'b'}, {"config", required_argument, NULL, 'c'}, {"net", required_argument, NULL, 'n'}, {"help", no_argument, NULL, 1}, @@ -88,8 +88,8 @@ static struct option const long_options[] = { static void version(void) { printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE, - VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR); - printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n" + BUILD_VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR); + printf("Copyright (C) 1998-2015 Ivo Timmermans, Guus Sliepen and others.\n" "See the AUTHORS file for a complete list.\n\n" "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n" "and you are welcome to redistribute it under certain conditions;\n" @@ -102,9 +102,11 @@ static void usage(bool status) { } else { printf("Usage: %s [options] command\n\n", program_name); printf("Valid options are:\n" + " -b, --batch Don't ask for anything (non-interactive mode).\n" " -c, --config=DIR Read configuration options from DIR.\n" " -n, --net=NETNAME Connect to net NETNAME.\n" " --pidfile=FILENAME Read control cookie from FILENAME.\n" + " --force Force some commands to work despite warnings.\n" " --help Display this help and exit.\n" " --version Output version information and exit.\n" "\n" @@ -119,15 +121,20 @@ static void usage(bool status) { " restart [tincd options] Restart tincd.\n" " reload Partially reload configuration of running tincd.\n" " pid Show PID of currently running tincd.\n" - " generate-keys [bits] Generate new RSA and ECDSA public/private keypairs.\n" +#ifdef DISABLE_LEGACY + " generate-keys Generate a new Ed25519 public/private keypair.\n" +#else + " generate-keys [bits] Generate new RSA and Ed25519 public/private keypairs.\n" " generate-rsa-keys [bits] Generate a new RSA public/private keypair.\n" - " generate-ecdsa-keys Generate a new ECDSA public/private keypair.\n" +#endif + " generate-ed25519-keys Generate a new Ed25519 public/private keypair.\n" " dump Dump a list of one of the following things:\n" " [reachable] nodes - all known nodes in the VPN\n" " edges - all known connections in the VPN\n" " subnets - all known subnets in the VPN\n" " connections - all meta connections with ourself\n" " [di]graph - graph of the VPN in dotty format\n" + " invitations - outstanding invitations\n" " info NODE|SUBNET|ADDRESS Give information about a particular NODE, SUBNET or ADDRESS.\n" " purge Purge unreachable nodes\n" " debug N Set debug level\n" @@ -140,11 +147,15 @@ static void usage(bool status) { " log [level] Dump log output [up to the specified level]\n" " export Export host configuration of local node to standard output\n" " export-all Export all host configuration files to standard output\n" - " import [--force] Import host configuration file(s) from standard input\n" - " exchange [--force] Same as export followed by import\n" - " exchange-all [--force] Same as export-all followed by import\n" + " import Import host configuration file(s) from standard input\n" + " exchange Same as export followed by import\n" + " exchange-all Same as export-all followed by import\n" " invite NODE [...] Generate an invitation for NODE\n" - " join INVITATION Join a VPN using an INVITIATION\n" + " join INVITATION Join a VPN using an INVITATION\n" + " network [NETNAME] List all known networks, or switch to the one named NETNAME.\n" + " fsck Check the configuration files for problems.\n" + " sign [FILE] Generate a signed version of a file.\n" + " verify NODE [FILE] Verify that a file was signed by the given NODE.\n" "\n"); printf("Report bugs to tinc@tinc-vpn.org.\n"); } @@ -159,6 +170,10 @@ static bool parse_options(int argc, char **argv) { case 0: /* long option */ break; + case 'b': + tty = false; + break; + case 'c': /* config file */ confbase = xstrdup(optarg); confbasegiven = true; @@ -211,6 +226,29 @@ static bool parse_options(int argc, char **argv) { return true; } +/* Open a file with the desired permissions, minus the umask. + Also, if we want to create an executable file, we call fchmod() + to set the executable bits. */ + +FILE *fopenmask(const char *filename, const char *mode, mode_t perms) { + mode_t mask = umask(0); + perms &= ~mask; + umask(~perms); + FILE *f = fopen(filename, mode); + + if(!f) { + fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno)); + return NULL; + } + +#ifdef HAVE_FCHMOD + if((perms & 0444) && f) + fchmod(fileno(f), perms); +#endif + umask(mask); + return f; +} + static void disable_old_keys(const char *filename, const char *what) { char tmpfile[PATH_MAX] = ""; char buf[1024]; @@ -225,33 +263,25 @@ static void disable_old_keys(const char *filename, const char *what) { snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename); - w = fopen(tmpfile, "w"); - -#ifdef HAVE_FCHMOD - /* Let the temporary file have the same permissions as the original. */ - - if(w) { - struct stat st = {.st_mode = 0600}; - fstat(fileno(r), &st); - fchmod(fileno(w), st.st_mode); - } -#endif + struct stat st = {.st_mode = 0600}; + fstat(fileno(r), &st); + w = fopenmask(tmpfile, "w", st.st_mode); while(fgets(buf, sizeof buf, r)) { if(!block && !strncmp(buf, "-----BEGIN ", 11)) { - if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) { + if((strstr(buf, " ED25519 ") && strstr(what, "Ed25519")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) { disabled = true; block = true; } } - bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA"); + bool ed25519pubkey = !strncasecmp(buf, "Ed25519PublicKey", 16) && strchr(" \t=", buf[16]) && strstr(what, "Ed25519"); - if(ecdsapubkey) + if(ed25519pubkey) disabled = true; if(w) { - if(block || ecdsapubkey) + if(block || ed25519pubkey) fputc('#', w); if(fputs(buf, w) < 0) { error = true; @@ -298,17 +328,16 @@ static void disable_old_keys(const char *filename, const char *what) { unlink(tmpfile); } -static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) { +static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) { FILE *r; - char *directory; + char directory[PATH_MAX] = "."; char buf[PATH_MAX]; char buf2[PATH_MAX]; /* Check stdin and stdout */ if(ask && tty) { /* Ask for a file and/or directory name. */ - fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename); - fflush(stdout); + fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename); if(fgets(buf, sizeof buf, stdin) == NULL) { fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno)); @@ -329,7 +358,7 @@ static FILE *ask_and_open(const char *filename, const char *what, const char *mo if(filename[0] != '/') { #endif /* The directory is a relative path or a filename. */ - directory = get_current_dir_name(); + getcwd(directory, sizeof directory); snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename); filename = buf2; } @@ -338,7 +367,7 @@ static FILE *ask_and_open(const char *filename, const char *what, const char *mo /* Open it first to keep the inode busy */ - r = fopen(filename, mode); + r = fopenmask(filename, mode, perms); if(!r) { fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno)); @@ -349,15 +378,15 @@ static FILE *ask_and_open(const char *filename, const char *what, const char *mo } /* - Generate a public/private ECDSA keypair, and ask for a file to store + Generate a public/private Ed25519 keypair, and ask for a file to store them in. */ -static bool ecdsa_keygen(bool ask) { +static bool ed25519_keygen(bool ask) { ecdsa_t *key; FILE *f; - char *pubname, *privname; + char fname[PATH_MAX]; - fprintf(stderr, "Generating ECDSA keypair:\n"); + fprintf(stderr, "Generating Ed25519 keypair:\n"); if(!(key = ecdsa_generate())) { fprintf(stderr, "Error during key generation!\n"); @@ -365,48 +394,46 @@ static bool ecdsa_keygen(bool ask) { } else fprintf(stderr, "Done.\n"); - xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase); - f = ask_and_open(privname, "private ECDSA key", "a", ask); - free(privname); + snprintf(fname, sizeof fname, "%s" SLASH "ed25519_key.priv", confbase); + f = ask_and_open(fname, "private Ed25519 key", "a", ask, 0600); if(!f) - return false; - -#ifdef HAVE_FCHMOD - /* Make it unreadable for others. */ - fchmod(fileno(f), 0600); -#endif + goto error; if(!ecdsa_write_pem_private_key(key, f)) { fprintf(stderr, "Error writing private key!\n"); - ecdsa_free(key); - fclose(f); - return false; + goto error; } fclose(f); if(name) - xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name); + snprintf(fname, sizeof fname, "%s" SLASH "hosts" SLASH "%s", confbase, name); else - xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase); + snprintf(fname, sizeof fname, "%s" SLASH "ed25519_key.pub", confbase); - f = ask_and_open(pubname, "public ECDSA key", "a", ask); - free(pubname); + f = ask_and_open(fname, "public Ed25519 key", "a", ask, 0666); if(!f) return false; char *pubkey = ecdsa_get_base64_public_key(key); - fprintf(f, "ECDSAPublicKey = %s\n", pubkey); + fprintf(f, "Ed25519PublicKey = %s\n", pubkey); free(pubkey); fclose(f); ecdsa_free(key); return true; + +error: + if(f) + fclose(f); + ecdsa_free(key); + return false; } +#ifndef DISABLE_LEGACY /* Generate a public/private RSA keypair, and ask for a file to store them in. @@ -414,7 +441,16 @@ static bool ecdsa_keygen(bool ask) { static bool rsa_keygen(int bits, bool ask) { rsa_t *key; FILE *f; - char *pubname, *privname; + char fname[PATH_MAX]; + + // Make sure the key size is a multiple of 8 bits. + bits &= ~0x7; + + // Force them to be between 1024 and 8192 bits long. + if(bits < 1024) + bits = 1024; + if(bits > 8192) + bits = 8192; fprintf(stderr, "Generating %d bits keys:\n", bits); @@ -424,50 +460,46 @@ static bool rsa_keygen(int bits, bool ask) { } else fprintf(stderr, "Done.\n"); - xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase); - f = ask_and_open(privname, "private RSA key", "a", ask); - free(privname); + snprintf(fname, sizeof fname, "%s" SLASH "rsa_key.priv", confbase); + f = ask_and_open(fname, "private RSA key", "a", ask, 0600); if(!f) - return false; - -#ifdef HAVE_FCHMOD - /* Make it unreadable for others. */ - fchmod(fileno(f), 0600); -#endif + goto error; if(!rsa_write_pem_private_key(key, f)) { fprintf(stderr, "Error writing private key!\n"); - fclose(f); - rsa_free(key); - return false; + goto error; } fclose(f); if(name) - xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name); + snprintf(fname, sizeof fname, "%s" SLASH "hosts" SLASH "%s", confbase, name); else - xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase); + snprintf(fname, sizeof fname, "%s" SLASH "rsa_key.pub", confbase); - f = ask_and_open(pubname, "public RSA key", "a", ask); - free(pubname); + f = ask_and_open(fname, "public RSA key", "a", ask, 0666); if(!f) - return false; + goto error; if(!rsa_write_pem_public_key(key, f)) { fprintf(stderr, "Error writing public key!\n"); - fclose(f); - rsa_free(key); - return false; + goto error; } fclose(f); rsa_free(key); return true; + +error: + if(f) + fclose(f); + rsa_free(key); + return false; } +#endif char buffer[4096]; size_t blen = 0; @@ -480,7 +512,7 @@ bool recvline(int fd, char *line, size_t len) { while(!(newline = memchr(buffer, '\n', blen))) { int result = recv(fd, buffer + blen, sizeof buffer - blen, 0); - if(result == -1 && errno == EINTR) + if(result == -1 && sockerrno == EINTR) continue; else if(result <= 0) return false; @@ -506,7 +538,7 @@ bool recvdata(int fd, char *data, size_t len) { while(blen < len) { int result = recv(fd, buffer + blen, sizeof buffer - blen, 0); - if(result == -1 && errno == EINTR) + if(result == -1 && sockerrno == EINTR) continue; else if(result <= 0) return false; @@ -537,8 +569,8 @@ bool sendline(int fd, char *format, ...) { blen++; while(blen) { - int result = send(fd, p, blen, 0); - if(result == -1 && errno == EINTR) + int result = send(fd, p, blen, MSG_NOSIGNAL); + if(result == -1 && sockerrno == EINTR) continue; else if(result <= 0) return false; @@ -687,14 +719,6 @@ bool connect_tincd(bool verbose) { fclose(f); -#ifdef HAVE_MINGW - if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { - if(verbose) - fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); - return false; - } -#endif - #ifndef HAVE_MINGW struct sockaddr_un sa; sa.sun_family = AF_UNIX; @@ -726,7 +750,7 @@ bool connect_tincd(bool verbose) { if(getaddrinfo(host, port, &hints, &res) || !res) { if(verbose) - fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno)); + fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, sockstrerror(sockerrno)); return false; } @@ -757,6 +781,11 @@ bool connect_tincd(bool verbose) { freeaddrinfo(res); #endif +#ifdef SO_NOSIGPIPE + static const int one = 1; + setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&one, sizeof one); +#endif + char data[4096]; int version; @@ -807,17 +836,39 @@ static int cmd_start(int argc, char *argv[]) { int nargc = 0; char **nargv = xzalloc((optind + argc) * sizeof *nargv); - nargv[nargc++] = c; + char *arg0 = c; +#ifdef HAVE_MINGW + /* + Windows has no real concept of an "argv array". A command line is just one string. + The CRT of the new process will decode the command line string to generate argv before calling main(), and (by convention) + it uses quotes to handle spaces in arguments. + Therefore we need to quote all arguments that might contain spaces. No, execvp() won't do that for us (see MSDN). + If we don't do that, then execvp() will run fine but any spaces in the filename contained in arg0 will bleed + into the next arguments when the spawned process' CRT parses its command line, resulting in chaos. + */ + xasprintf(&arg0, "\"%s\"", arg0); +#endif + nargv[nargc++] = arg0; for(int i = 1; i < optind; i++) nargv[nargc++] = orig_argv[i]; for(int i = 1; i < argc; i++) nargv[nargc++] = argv[i]; #ifdef HAVE_MINGW - execvp(c, nargv); - fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno)); - return 1; + int status = spawnvp(_P_WAIT, c, nargv); + if (status == -1) { + fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno)); + return 1; + } + return status; #else + int pfd[2] = {-1, -1}; + if(socketpair(AF_UNIX, SOCK_STREAM, 0, pfd)) { + fprintf(stderr, "Could not create umbilical socket: %s\n", strerror(errno)); + free(nargv); + return 1; + } + pid_t pid = fork(); if(pid == -1) { fprintf(stderr, "Could not fork: %s\n", strerror(errno)); @@ -825,8 +876,15 @@ static int cmd_start(int argc, char *argv[]) { return 1; } - if(!pid) + if(!pid) { + close(pfd[0]); + char buf[100] = ""; + snprintf(buf, sizeof buf, "%d", pfd[1]); + setenv("TINC_UMBILICAL", buf, true); exit(execvp(c, nargv)); + } else { + close(pfd[1]); + } free(nargv); @@ -834,12 +892,33 @@ static int cmd_start(int argc, char *argv[]) { #ifdef SIGINT signal(SIGINT, SIG_IGN); #endif + + // Pass all log messages from the umbilical to stderr. + // A nul-byte right before closure means tincd started succesfully. + bool failure = true; + char buf[1024]; + ssize_t len; + + while((len = read(pfd[0], buf, sizeof buf)) > 0) { + failure = buf[len - 1]; + if(!failure) + len--; + write(2, buf, len); + } + + if(len) + failure = true; + + close(pfd[0]); + + // Make sure the child process is really gone. result = waitpid(pid, &status, 0); + #ifdef SIGINT signal(SIGINT, SIG_DFL); #endif - if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) { + if(failure || result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) { fprintf(stderr, "Error starting %s\n", c); return 1; } @@ -910,6 +989,65 @@ static int cmd_reload(int argc, char *argv[]) { } +static int dump_invitations(void) { + char dname[PATH_MAX]; + snprintf(dname, sizeof dname, "%s" SLASH "invitations", confbase); + DIR *dir = opendir(dname); + if(!dir) { + if(errno == ENOENT) { + fprintf(stderr, "No outstanding invitations.\n"); + return 0; + } + + fprintf(stderr, "Cannot not read directory %s: %s\n", dname, strerror(errno)); + return 1; + } + + struct dirent *ent; + bool found = false; + + while((ent = readdir(dir))) { + char buf[MAX_STRING_SIZE]; + if(b64decode(ent->d_name, buf, 24) != 18) + continue; + + char fname[PATH_MAX]; + snprintf(fname, sizeof fname, "%s" SLASH "%s", dname, ent->d_name); + FILE *f = fopen(fname, "r"); + if(!f) { + fprintf(stderr, "Cannot open %s: %s\n", fname, strerror(errno)); + fclose(f); + continue; + } + + buf[0] = 0; + if(!fgets(buf, sizeof buf, f)) { + fprintf(stderr, "Invalid invitation file %s", fname); + fclose(f); + continue; + } + fclose(f); + + char *eol = buf + strlen(buf); + while(strchr("\t \r\n", *--eol)) + *eol = 0; + if(strncmp(buf, "Name = ", 7) || !check_id(buf + 7)) { + fprintf(stderr, "Invalid invitation file %s", fname); + continue; + } + + found = true; + printf("%s %s\n", ent->d_name, buf + 7); + } + + closedir(dir); + + if(!found) + fprintf(stderr, "No outstanding invitations.\n"); + + return 0; +} + static int cmd_dump(int argc, char *argv[]) { bool only_reachable = false; @@ -930,6 +1068,9 @@ static int cmd_dump(int argc, char *argv[]) { return 1; } + if(!strcasecmp(argv[1], "invitations")) + return dump_invitations(); + if(!connect_tincd(true)) return 1; @@ -978,11 +1119,14 @@ static int cmd_dump(int argc, char *argv[]) { break; char node[4096]; + char id[4096]; char from[4096]; char to[4096]; char subnet[4096]; char host[4096]; char port[4096]; + char local_host[4096]; + char local_port[4096]; char via[4096]; char nexthop[4096]; int cipher, digest, maclength, compression, distance, socket, weight; @@ -993,8 +1137,8 @@ static int cmd_dump(int argc, char *argv[]) { switch(req) { case REQ_DUMP_NODES: { - int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change); - if(n != 16) { + int n = sscanf(line, "%*d %*d %s %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, id, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change); + if(n != 17) { fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line); return 1; } @@ -1017,14 +1161,14 @@ static int cmd_dump(int argc, char *argv[]) { } else { if(only_reachable && !status.reachable) continue; - printf("%s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n", - node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu); + printf("%s id %s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n", + node, id, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu); } } break; case REQ_DUMP_EDGES: { - int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight); - if(n != 6) { + int n = sscanf(line, "%*d %*d %s %s %s port %s %s port %s %x %d", from, to, host, port, local_host, local_port, &options, &weight); + if(n != 8) { fprintf(stderr, "Unable to parse edge dump from tincd.\n"); return 1; } @@ -1036,7 +1180,7 @@ static int cmd_dump(int argc, char *argv[]) { else if(do_graph == 2) printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w); } else { - printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight); + printf("%s to %s at %s port %s local %s port %s options %x weight %d\n", from, to, host, port, local_host, local_port, options, weight); } } break; @@ -1279,7 +1423,7 @@ char *get_my_name(bool verbose) { continue; if(*value) { fclose(f); - return strdup(value); + return replace_name(value); } } @@ -1289,6 +1433,29 @@ char *get_my_name(bool verbose) { return NULL; } +static ecdsa_t *get_pubkey(FILE *f) { + char buf[4096]; + char *value; + while(fgets(buf, sizeof buf, f)) { + int len = strcspn(buf, "\t ="); + value = buf + len; + value += strspn(value, "\t "); + if(*value == '=') { + value++; + value += strspn(value, "\t "); + } + if(!rstrip(value)) + continue; + buf[len] = 0; + if(strcasecmp(buf, "Ed25519PublicKey")) + continue; + if(*value) + return ecdsa_set_base64_public_key(value); + } + + return NULL; +} + const var_t variables[] = { /* Server configuration */ {"AddressFamily", VAR_SERVER}, @@ -1296,12 +1463,14 @@ const var_t variables[] = { {"BindToAddress", VAR_SERVER | VAR_MULTIPLE}, {"BindToInterface", VAR_SERVER}, {"Broadcast", VAR_SERVER | VAR_SAFE}, + {"BroadcastSubnet", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE}, {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE}, {"DecrementTTL", VAR_SERVER}, {"Device", VAR_SERVER}, + {"DeviceStandby", VAR_SERVER}, {"DeviceType", VAR_SERVER}, {"DirectOnly", VAR_SERVER}, - {"ECDSAPrivateKeyFile", VAR_SERVER}, + {"Ed25519PrivateKeyFile", VAR_SERVER}, {"ExperimentalProtocol", VAR_SERVER}, {"Forwarding", VAR_SERVER}, {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE}, @@ -1309,6 +1478,7 @@ const var_t variables[] = { {"IffOneQueue", VAR_SERVER}, {"Interface", VAR_SERVER}, {"KeyExpire", VAR_SERVER}, + {"ListenAddress", VAR_SERVER | VAR_MULTIPLE}, {"LocalDiscovery", VAR_SERVER}, {"MACExpire", VAR_SERVER}, {"MaxConnectionBurst", VAR_SERVER}, @@ -1328,8 +1498,17 @@ const var_t variables[] = { {"ScriptsInterpreter", VAR_SERVER}, {"StrictSubnets", VAR_SERVER}, {"TunnelServer", VAR_SERVER}, + {"UDPDiscovery", VAR_SERVER}, + {"UDPDiscoveryKeepaliveInterval", VAR_SERVER}, + {"UDPDiscoveryInterval", VAR_SERVER}, + {"UDPDiscoveryTimeout", VAR_SERVER}, + {"MTUInfoInterval", VAR_SERVER}, + {"UDPInfoInterval", VAR_SERVER}, {"UDPRcvBuf", VAR_SERVER}, {"UDPSndBuf", VAR_SERVER}, + {"UPnP", VAR_SERVER}, + {"UPnPDiscoverWait", VAR_SERVER}, + {"UPnPRefreshPeriod", VAR_SERVER}, {"VDEGroup", VAR_SERVER}, {"VDEPort", VAR_SERVER}, /* Host configuration */ @@ -1338,8 +1517,8 @@ const var_t variables[] = { {"ClampMSS", VAR_SERVER | VAR_HOST}, {"Compression", VAR_SERVER | VAR_HOST}, {"Digest", VAR_SERVER | VAR_HOST}, - {"ECDSAPublicKey", VAR_HOST}, - {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST}, + {"Ed25519PublicKey", VAR_HOST}, + {"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST}, {"IndirectData", VAR_SERVER | VAR_HOST}, {"MACLength", VAR_SERVER | VAR_HOST}, {"PMTU", VAR_SERVER | VAR_HOST}, @@ -1489,11 +1668,11 @@ static int cmd_config(int argc, char *argv[]) { } // Open the right configuration file. - char *filename; + char filename[PATH_MAX]; if(node) - xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node); + snprintf(filename, sizeof filename, "%s" SLASH "%s", hosts_dir, node); else - filename = tinc_conf; + snprintf(filename, sizeof filename, "%s", tinc_conf); FILE *f = fopen(filename, "r"); if(!f) { @@ -1501,11 +1680,11 @@ static int cmd_config(int argc, char *argv[]) { return 1; } - char *tmpfile = NULL; + char tmpfile[PATH_MAX]; FILE *tf = NULL; if(action >= -1) { - xasprintf(&tmpfile, "%s.config.tmp", filename); + snprintf(tmpfile, sizeof tmpfile, "%s.config.tmp", filename); tf = fopen(tmpfile, "w"); if(!tf) { fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno)); @@ -1568,6 +1747,11 @@ static int cmd_config(int argc, char *argv[]) { } set = true; continue; + // Add + } else if(action > 0) { + // Check if we've already seen this variable with the same value + if(!strcasecmp(bvalue, value)) + found = true; } } @@ -1600,7 +1784,7 @@ static int cmd_config(int argc, char *argv[]) { } // Add new variable if necessary. - if(action > 0 || (action == 0 && !set)) { + if((action > 0 && !found)|| (action == 0 && !set)) { if(fprintf(tf, "%s = %s\n", variable, value) < 0) { fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; @@ -1608,9 +1792,12 @@ static int cmd_config(int argc, char *argv[]) { } if(action < -1) { - if(!found) + if(found) { + return 0; + } else { fprintf(stderr, "No matching configuration variables found.\n"); - return 0; + return 1; + } } // Make sure we wrote everything... @@ -1623,7 +1810,7 @@ static int cmd_config(int argc, char *argv[]) { if(action < 0 && !removed) { remove(tmpfile); fprintf(stderr, "No configuration variables deleted.\n"); - return *value; + return 1; } // Replace the configuration file with the new one @@ -1645,20 +1832,8 @@ static int cmd_config(int argc, char *argv[]) { return 0; } -bool check_id(const char *name) { - if(!name || !*name) - return false; - - for(int i = 0; i < strlen(name); i++) { - if(!isalnum(name[i]) && name[i] != '_') - return false; - } - - return true; -} - static bool try_bind(int port) { - struct addrinfo *ai = NULL; + struct addrinfo *ai = NULL, *aip; struct addrinfo hint = { .ai_flags = AI_PASSIVE, .ai_family = AF_UNSPEC, @@ -1666,24 +1841,30 @@ static bool try_bind(int port) { .ai_protocol = IPPROTO_TCP, }; + bool success = true; char portstr[16]; snprintf(portstr, sizeof portstr, "%d", port); if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) return false; - while(ai) { + for(aip = ai; aip; aip = aip->ai_next) { int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP); - if(!fd) - return false; + if(!fd) { + success = false; + break; + } + int result = bind(fd, ai->ai_addr, ai->ai_addrlen); closesocket(fd); - if(result) - return false; - ai = ai->ai_next; + if(result) { + success = false; + break; + } } - return true; + freeaddrinfo(ai); + return success; } int check_port(char *name) { @@ -1695,11 +1876,11 @@ int check_port(char *name) { for(int i = 0; i < 100; i++) { int port = 0x1000 + (rand() & 0x7fff); if(try_bind(port)) { - char *filename; - xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name); + char filename[PATH_MAX]; + snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", confbase, name); FILE *f = fopen(filename, "a"); - free(filename); if(!f) { + fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno)); fprintf(stderr, "Please change tinc's Port manually.\n"); return 0; } @@ -1727,8 +1908,7 @@ static int cmd_init(int argc, char *argv[]) { } else if(argc < 2) { if(tty) { char buf[1024]; - fprintf(stdout, "Enter the Name you want your tinc node to have: "); - fflush(stdout); + fprintf(stderr, "Enter the Name you want your tinc node to have: "); if(!fgets(buf, sizeof buf, stdin)) { fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno)); return 1; @@ -1756,17 +1936,17 @@ static int cmd_init(int argc, char *argv[]) { return 1; } - if(mkdir(confdir, 0755) && errno != EEXIST) { - fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno)); + if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) { + fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno)); return 1; } - 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 1; } - 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 1; } @@ -1780,24 +1960,26 @@ static int cmd_init(int argc, char *argv[]) { fprintf(f, "Name = %s\n", name); fclose(f); - if(!rsa_keygen(2048, false) || !ecdsa_keygen(false)) +#ifndef DISABLE_LEGACY + if(!rsa_keygen(2048, false)) + return 1; +#endif + + if(!ed25519_keygen(false)) return 1; check_port(name); #ifndef HAVE_MINGW - char *filename; - xasprintf(&filename, "%s" SLASH "tinc-up", confbase); + char filename[PATH_MAX]; + snprintf(filename, sizeof filename, "%s" SLASH "tinc-up", confbase); if(access(filename, F_OK)) { - FILE *f = fopen(filename, "w"); + FILE *f = fopenmask(filename, "w", 0777); if(!f) { fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); return 1; } - mode_t mask = umask(0); - umask(mask); - fchmod(fileno(f), 0755 & ~mask); - fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit!'\n\n#ifconfig $INTERFACE netmask \n"); + fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE netmask \n"); fclose(f); } #endif @@ -1807,7 +1989,11 @@ static int cmd_init(int argc, char *argv[]) { } static int cmd_generate_keys(int argc, char *argv[]) { +#ifdef DISABLE_LEGACY + if(argc > 1) { +#else if(argc > 2) { +#endif fprintf(stderr, "Too many arguments!\n"); return 1; } @@ -1815,9 +2001,18 @@ static int cmd_generate_keys(int argc, char *argv[]) { if(!name) name = get_my_name(false); - return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true)); +#ifndef DISABLE_LEGACY + if(!rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true)) + return 1; +#endif + + if(!ed25519_keygen(true)) + return 1; + + return 0; } +#ifndef DISABLE_LEGACY static int cmd_generate_rsa_keys(int argc, char *argv[]) { if(argc > 2) { fprintf(stderr, "Too many arguments!\n"); @@ -1829,8 +2024,9 @@ static int cmd_generate_rsa_keys(int argc, char *argv[]) { return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true); } +#endif -static int cmd_generate_ecdsa_keys(int argc, char *argv[]) { +static int cmd_generate_ed25519_keys(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; @@ -1839,7 +2035,7 @@ static int cmd_generate_ecdsa_keys(int argc, char *argv[]) { if(!name) name = get_my_name(false); - return !ecdsa_keygen(true); + return !ed25519_keygen(true); } static int cmd_help(int argc, char *argv[]) { @@ -1886,12 +2082,12 @@ static int cmd_edit(int argc, char *argv[]) { return 1; } - char *filename = NULL; + char filename[PATH_MAX] = ""; if(strncmp(argv[1], "hosts" SLASH, 6)) { for(int i = 0; conffiles[i]; i++) { if(!strcmp(argv[1], conffiles[i])) { - xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]); + snprintf(filename, sizeof filename, "%s" SLASH "%s", confbase, argv[1]); break; } } @@ -1899,8 +2095,8 @@ static int cmd_edit(int argc, char *argv[]) { argv[1] += 6; } - if(!filename) { - xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]); + if(!*filename) { + snprintf(filename, sizeof filename, "%s" SLASH "%s", hosts_dir, argv[1]); char *dash = strchr(argv[1], '-'); if(dash) { *dash++ = 0; @@ -1918,6 +2114,7 @@ static int cmd_edit(int argc, char *argv[]) { xasprintf(&command, "edit \"%s\"", filename); #endif int result = system(command); + free(command); if(result) return result; @@ -1929,8 +2126,8 @@ static int cmd_edit(int argc, char *argv[]) { } static int export(const char *name, FILE *out) { - char *filename; - xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name); + char filename[PATH_MAX]; + snprintf(filename, sizeof filename, "%s" SLASH "%s", hosts_dir, name); FILE *in = fopen(filename, "r"); if(!in) { fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno)); @@ -2017,7 +2214,7 @@ static int cmd_import(int argc, char *argv[]) { char buf[4096]; char name[4096]; - char *filename = NULL; + char filename[PATH_MAX] = ""; int count = 0; bool firstline = true; @@ -2033,8 +2230,7 @@ static int cmd_import(int argc, char *argv[]) { if(out) fclose(out); - free(filename); - xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name); + snprintf(filename, sizeof filename, "%s" SLASH "%s", hosts_dir, name); if(!force && !access(filename, F_OK)) { fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename); @@ -2087,6 +2283,301 @@ static int cmd_exchange_all(int argc, char *argv[]) { return cmd_export_all(argc, argv) ?: cmd_import(argc, argv); } +static int switch_network(char *name) { + if(fd >= 0) { + close(fd); + fd = -1; + } + + free(confbase); + confbase = NULL; + free(pidfilename); + pidfilename = NULL; + free(logfilename); + logfilename = NULL; + free(unixsocketname); + unixsocketname = NULL; + free(tinc_conf); + free(hosts_dir); + free(prompt); + + free(netname); + netname = strcmp(name, ".") ? xstrdup(name) : NULL; + + xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase); + xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase); + xasprintf(&prompt, "%s> ", identname); + + return 0; +} + +static int cmd_network(int argc, char *argv[]) { + if(argc > 2) { + fprintf(stderr, "Too many arguments!\n"); + return 1; + } + + if(argc == 2) + return switch_network(argv[1]); + + DIR *dir = opendir(confdir); + if(!dir) { + fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno)); + return 1; + } + + struct dirent *ent; + while((ent = readdir(dir))) { + if(*ent->d_name == '.') + continue; + + if(!strcmp(ent->d_name, "tinc.conf")) { + printf(".\n"); + continue; + } + + char fname[PATH_MAX]; + snprintf(fname, sizeof fname, "%s/%s/tinc.conf", confdir, ent->d_name); + if(!access(fname, R_OK)) + printf("%s\n", ent->d_name); + } + + closedir(dir); + + return 0; +} + +static int cmd_fsck(int argc, char *argv[]) { + if(argc > 1) { + fprintf(stderr, "Too many arguments!\n"); + return 1; + } + + return fsck(orig_argv[0]); +} + +static void *readfile(FILE *in, size_t *len) { + size_t count = 0; + size_t alloced = 4096; + char *buf = xmalloc(alloced); + + while(!feof(in)) { + size_t read = fread(buf + count, 1, alloced - count, in); + if(!read) + break; + count += read; + if(count >= alloced) { + alloced *= 2; + buf = xrealloc(buf, alloced); + } + } + + if(len) + *len = count; + + return buf; +} + +static int cmd_sign(int argc, char *argv[]) { + if(argc > 2) { + fprintf(stderr, "Too many arguments!\n"); + return 1; + } + + if(!name) { + name = get_my_name(true); + if(!name) + return 1; + } + + char fname[PATH_MAX]; + snprintf(fname, sizeof fname, "%s" SLASH "ed25519_key.priv", confbase); + FILE *fp = fopen(fname, "r"); + if(!fp) { + fprintf(stderr, "Could not open %s: %s\n", fname, strerror(errno)); + return 1; + } + + ecdsa_t *key = ecdsa_read_pem_private_key(fp); + + if(!key) { + fprintf(stderr, "Could not read private key from %s\n", fname); + fclose(fp); + return 1; + } + + fclose(fp); + + FILE *in; + + if(argc == 2) { + in = fopen(argv[1], "rb"); + if(!in) { + fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno)); + ecdsa_free(key); + return 1; + } + } else { + in = stdin; + } + + size_t len; + char *data = readfile(in, &len); + if(in != stdin) + fclose(in); + if(!data) { + fprintf(stderr, "Error reading %s: %s\n", argv[1], strerror(errno)); + ecdsa_free(key); + return 1; + } + + // Ensure we sign our name and current time as well + long t = time(NULL); + char *trailer; + xasprintf(&trailer, " %s %ld", name, t); + int trailer_len = strlen(trailer); + + data = xrealloc(data, len + trailer_len); + memcpy(data + len, trailer, trailer_len); + free(trailer); + + char sig[87]; + if(!ecdsa_sign(key, data, len + trailer_len, sig)) { + fprintf(stderr, "Error generating signature\n"); + free(data); + ecdsa_free(key); + return 1; + } + b64encode(sig, sig, 64); + ecdsa_free(key); + + fprintf(stdout, "Signature = %s %ld %s\n", name, t, sig); + fwrite(data, len, 1, stdout); + + free(data); + return 0; +} + +static int cmd_verify(int argc, char *argv[]) { + if(argc < 2) { + fprintf(stderr, "Not enough arguments!\n"); + return 1; + } + + if(argc > 3) { + fprintf(stderr, "Too many arguments!\n"); + return 1; + } + + char *node = argv[1]; + if(!strcmp(node, ".")) { + if(!name) { + name = get_my_name(true); + if(!name) + return 1; + } + node = name; + } else if(!strcmp(node, "*")) { + node = NULL; + } else { + if(!check_id(node)) { + fprintf(stderr, "Invalid node name\n"); + return 1; + } + } + + FILE *in; + + if(argc == 3) { + in = fopen(argv[2], "rb"); + if(!in) { + fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno)); + return 1; + } + } else { + in = stdin; + } + + size_t len; + char *data = readfile(in, &len); + if(in != stdin) + fclose(in); + if(!data) { + fprintf(stderr, "Error reading %s: %s\n", argv[1], strerror(errno)); + return 1; + } + + char *newline = memchr(data, '\n', len); + if(!newline || (newline - data > MAX_STRING_SIZE - 1)) { + fprintf(stderr, "Invalid input\n"); + return 1; + } + + *newline++ = '\0'; + + char signer[MAX_STRING_SIZE] = ""; + char sig[MAX_STRING_SIZE] = ""; + long t = 0; + + if(sscanf(data, "Signature = %s %ld %s", signer, &t, sig) != 3 || strlen(sig) != 86 || !t || !check_id(signer)) { + fprintf(stderr, "Invalid input\n"); + return 1; + } + + if(node && strcmp(node, signer)) { + fprintf(stderr, "Signature is not made by %s\n", node); + return 1; + } + + if(!node) + node = signer; + + char *trailer; + xasprintf(&trailer, " %s %ld", signer, t); + int trailer_len = strlen(trailer); + + data = xrealloc(data, len + trailer_len); + memcpy(data + len, trailer, trailer_len); + free(trailer); + + char fname[PATH_MAX]; + snprintf(fname, sizeof fname, "%s" SLASH "hosts" SLASH "%s", confbase, node); + FILE *fp = fopen(fname, "r"); + if(!fp) { + fprintf(stderr, "Could not open %s: %s\n", fname, strerror(errno)); + free(data); + return 1; + } + + ecdsa_t *key = get_pubkey(fp); + if(!key) { + rewind(fp); + key = ecdsa_read_pem_public_key(fp); + } + if(!key) { + fprintf(stderr, "Could not read public key from %s\n", fname); + fclose(fp); + free(data); + return 1; + } + + fclose(fp); + + if(b64decode(sig, sig, 86) != 64 || !ecdsa_verify(key, newline, len + trailer_len - (newline - data), sig)) { + fprintf(stderr, "Invalid signature\n"); + free(data); + ecdsa_free(key); + return 1; + } + + ecdsa_free(key); + + fwrite(newline, len - (newline - data), 1, stdout); + + free(data); + return 0; +} + static const struct { const char *command; int (*function)(int argc, char *argv[]); @@ -2097,6 +2588,7 @@ static const struct { {"restart", cmd_restart}, {"reload", cmd_reload}, {"dump", cmd_dump}, + {"list", cmd_dump}, {"purge", cmd_purge}, {"debug", cmd_debug}, {"retry", cmd_retry}, @@ -2113,8 +2605,10 @@ static const struct { {"set", cmd_config}, {"init", cmd_init}, {"generate-keys", cmd_generate_keys}, +#ifndef DISABLE_LEGACY {"generate-rsa-keys", cmd_generate_rsa_keys}, - {"generate-ecdsa-keys", cmd_generate_ecdsa_keys}, +#endif + {"generate-ed25519-keys", cmd_generate_ed25519_keys}, {"help", cmd_help}, {"version", cmd_version}, {"info", cmd_info}, @@ -2126,6 +2620,10 @@ static const struct { {"exchange-all", cmd_exchange_all}, {"invite", cmd_invite}, {"join", cmd_join}, + {"network", cmd_network}, + {"fsck", cmd_fsck}, + {"sign", cmd_sign}, + {"verify", cmd_verify}, {NULL, NULL}, }; @@ -2252,7 +2750,6 @@ static char **completion (const char *text, int start, int end) { #endif static int cmd_shell(int argc, char *argv[]) { - char *prompt; xasprintf(&prompt, "%s> ", identname); int result = 0; char buf[4096]; @@ -2356,11 +2853,12 @@ int main(int argc, char *argv[]) { program_name = argv[0]; orig_argv = argv; orig_argc = argc; + tty = isatty(0) && isatty(1); if(!parse_options(argc, argv)) return 1; - make_names(); + make_names(false); xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase); xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase); @@ -2374,11 +2872,18 @@ int main(int argc, char *argv[]) { return 0; } +#ifdef HAVE_MINGW + static struct WSAData wsa_state; + + if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { + fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); + return false; + } +#endif + srand(time(NULL)); crypto_init(); - tty = isatty(0) && isatty(1); - if(optind >= argc) return cmd_shell(argc, argv);