/*
- conf.c -- configuration code
- Copyright (C) 1998 Robert van der Meulen
- 1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
- 2000 Cris van Pelt <tribbel@arise.dhs.org>
+ econf.c -- configuration code
+ Copyright (C) 2018 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
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: conf.c,v 1.9.4.38 2001/01/07 17:08:55 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
+#include "system.h"
+#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <syslog.h>
+#include "conf.h"
+#include "crypto.h"
+#include "logger.h"
+#include "meshlink_internal.h"
+#include "xalloc.h"
+#include "packmsg.h"
+
+/// Generate a path to the main configuration file.
+static void make_main_path(meshlink_handle_t *mesh, char *path, size_t len) {
+ snprintf(path, len, "%s" SLASH "meshlink.conf", mesh->confbase);
+}
-#include <xalloc.h>
-#include <utils.h> /* for cp */
+/// Generate a path to a host configuration file.
+static void make_host_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
+ snprintf(path, len, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+}
-#include "conf.h"
-#include "netutl.h" /* for strtoip */
+/// Generate a path to an unused invitation file.
+static void make_invitation_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
+ snprintf(path, len, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, name);
+}
-#include "system.h"
+/// Generate a path to a used invitation file.
+static void make_used_invitation_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
+ snprintf(path, len, "%s" SLASH "invitations" SLASH "%s.used", mesh->confbase, name);
+}
-config_t *config = NULL;
-int debug_lvl = 0;
-int timeout = 0; /* seconds before timeout */
-char *confbase = NULL; /* directory in which all config files are */
-char *netname = NULL; /* name of the vpn network */
+/// Remove a directory recursively
+static void deltree(const char *dirname) {
+ DIR *d = opendir(dirname);
-/* Will be set if HUP signal is received. It will be processed when it is safe. */
-int sighup = 0;
+ if(d) {
+ struct dirent *ent;
-/*
- These are all the possible configurable values
-*/
-static internal_config_t hazahaza[] = {
-/* Main configuration file keywords */
- { "ConnectTo", config_connectto, TYPE_NAME },
- { "Hostnames", config_hostnames, TYPE_BOOL },
- { "Interface", config_interface, TYPE_NAME },
- { "InterfaceIP", config_interfaceip, TYPE_IP },
- { "KeyExpire", config_keyexpire, TYPE_INT },
- { "MyVirtualIP", config_dummy, TYPE_IP },
- { "MyOwnVPNIP", config_dummy, TYPE_IP },
- { "Name", config_name, TYPE_NAME },
- { "PingTimeout", config_pingtimeout, TYPE_INT },
- { "PrivateKey", config_privatekey, TYPE_NAME },
- { "PrivateKeyFile", config_privatekeyfile, TYPE_NAME },
- { "TapDevice", config_tapdevice, TYPE_NAME },
- { "VpnMask", config_dummy, TYPE_IP },
-/* Host configuration file keywords */
- { "Address", config_address, TYPE_NAME },
- { "IndirectData", config_indirectdata, TYPE_BOOL },
- { "Port", config_port, TYPE_INT },
- { "PublicKey", config_publickey, TYPE_NAME },
- { "PublicKeyFile", config_publickeyfile, TYPE_NAME },
- { "RestrictAddress", config_restrictaddress, TYPE_BOOL },
- { "RestrictHosts", config_restricthosts, TYPE_BOOL },
- { "RestrictPort", config_restrictport, TYPE_BOOL },
- { "RestrictSubnets", config_restrictsubnets, TYPE_BOOL },
- { "Subnet", config_subnet, TYPE_IP }, /* Use IPv4 subnets only for now */
- { "TCPonly", config_tcponly, TYPE_BOOL },
- { NULL, 0, 0 }
-};
+ while((ent = readdir(d))) {
+ if(ent->d_name[0] == '.') {
+ continue;
+ }
-/*
- Add given value to the list of configs cfg
-*/
-config_t *
-add_config_val(config_t **cfg, int argtype, char *val)
-{
- config_t *p;
- char *q;
-cp
- p = (config_t*)xmalloc(sizeof(*p));
- p->data.val = 0;
-
- switch(argtype)
- {
- case TYPE_INT:
- p->data.val = strtol(val, &q, 0);
- if(q && *q)
- p->data.val = 0;
- break;
- case TYPE_NAME:
- p->data.ptr = xmalloc(strlen(val) + 1);
- strcpy(p->data.ptr, val);
- break;
- case TYPE_IP:
- p->data.ip = strtoip(val);
- break;
- case TYPE_BOOL:
- if(!strcasecmp("yes", val))
- p->data.val = stupid_true;
- else if(!strcasecmp("no", val))
- p->data.val = stupid_false;
- else
- p->data.val = 0;
- }
-
- p->argtype = argtype;
-
- if(p->data.val)
- {
- p->next = *cfg;
- *cfg = p;
-cp
- return p;
- }
- else
- {
- free(p);
-cp
- return NULL;
- }
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
+
+ if(unlink(filename)) {
+ deltree(filename);
+ }
+ }
+
+ closedir(d);
+ }
+
+ rmdir(dirname);
}
-/*
- Read exactly one line and strip the trailing newline if any. If the
- file was on EOF, return NULL. Otherwise, return all the data in a
- dynamically allocated buffer.
-
- If line is non-NULL, it will be used as an initial buffer, to avoid
- unnecessary mallocing each time this function is called. If buf is
- given, and buf needs to be expanded, the var pointed to by buflen
- will be increased.
-*/
-char *readline(FILE *fp, char **buf, size_t *buflen)
-{
- char *newline = NULL;
- char *p;
- char *line; /* The array that contains everything that has been read
- so far */
- char *idx; /* Read into this pointer, which points to an offset
- within line */
- size_t size, newsize; /* The size of the current array pointed to by
- line */
- size_t maxlen; /* Maximum number of characters that may be read with
- fgets. This is newsize - oldsize. */
-
- if(feof(fp))
- return NULL;
-
- if((buf != NULL) && (buflen != NULL))
- {
- size = *buflen;
- line = *buf;
- }
- else
- {
- size = 100;
- line = xmalloc(size);
- }
-
- maxlen = size;
- idx = line;
- *idx = 0;
- for(;;)
- {
- errno = 0;
- p = fgets(idx, maxlen, fp);
- if(p == NULL) /* EOF or error */
- {
- if(feof(fp))
- break;
-
- /* otherwise: error; let the calling function print an error
- message if applicable */
- free(line);
- return NULL;
+/// Create a fresh configuration directory
+bool config_init(meshlink_handle_t *mesh) {
+ if(mkdir(mesh->confbase, 0700) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
+ return false;
}
- newline = strchr(p, '\n');
- if(newline == NULL)
- /* We haven't yet read everything to the end of the line */
- {
- newsize = size << 1;
- line = xrealloc(line, newsize);
- idx = &line[size - 1];
- maxlen = newsize - size + 1;
- size = newsize;
+ char path[PATH_MAX];
+
+ // Remove meshlink.conf
+ snprintf(path, sizeof(path), "%s" SLASH "meshlink.conf", mesh->confbase);
+ unlink(path);
+
+ // Remove any host config files
+ snprintf(path, sizeof(path), "%s" SLASH "hosts", mesh->confbase);
+ deltree(path);
+
+ if(mkdir(path, 0700) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", path, strerror(errno));
+ return false;
}
- else
- {
- *newline = '\0'; /* kill newline */
- break; /* yay */
+
+ // Remove any invitation files
+ snprintf(path, sizeof(path), "%s" SLASH "invitations", mesh->confbase);
+ deltree(path);
+
+ if(mkdir(path, 0700) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", path, strerror(errno));
+ return false;
}
- }
-
- if((buf != NULL) && (buflen != NULL))
- {
- *buflen = size;
- *buf = line;
- }
- return line;
+
+ return true;
}
-/*
- Parse a configuration file and put the results in the configuration tree
- starting at *base.
-*/
-int read_config_file(config_t **base, const char *fname)
-{
- int err = -2; /* Parse error */
- FILE *fp;
- char *buffer, *line;
- char *p, *q;
- int i, lineno = 0;
- config_t *cfg;
- size_t bufsize;
-
-cp
- if((fp = fopen (fname, "r")) == NULL)
- {
- syslog(LOG_ERR, _("Cannot open config file %s: %m"), fname);
- return -1;
- }
-
- bufsize = 100;
- buffer = xmalloc(bufsize);
-
- for(;;)
- {
-
- if((line = readline(fp, &buffer, &bufsize)) == NULL)
- {
- err = -1;
- break;
+/// Wipe an existing configuration directory
+bool config_destroy(const char *confbase) {
+ char path[PATH_MAX];
+
+ // Remove meshlink.conf
+ snprintf(path, sizeof(path), "%s" SLASH "meshlink.conf", confbase);
+
+ if(unlink(path)) {
+ if(errno == ENOENT) {
+ meshlink_errno = MESHLINK_ENOENT;
+ return false;
+ } else {
+ logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", path, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
}
- if(feof(fp))
- {
- err = 0;
- break;
+ deltree(confbase);
+ return true;
+}
+
+/// Check the presence of the main configuration file.
+bool main_config_exists(meshlink_handle_t *mesh) {
+ char path[PATH_MAX];
+ make_main_path(mesh, path, sizeof(path));
+
+ return access(path, F_OK) == 0;
+}
+
+/// Lock the main configuration file.
+bool main_config_lock(meshlink_handle_t *mesh) {
+ char path[PATH_MAX];
+ make_main_path(mesh, path, sizeof(path));
+
+ mesh->conffile = fopen(path, "r");
+
+ if(!mesh->conffile) {
+ logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", path, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
}
- lineno++;
+#ifdef FD_CLOEXEC
+ fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC);
+#endif
- if((p = strtok(line, "\t =")) == NULL)
- continue; /* no tokens on this line */
+#ifdef HAVE_MINGW
+ // TODO: use _locking()?
+#else
- if(p[0] == '#')
- continue; /* comment: ignore */
+ if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) {
+ logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", path, strerror(errno));
+ fclose(mesh->conffile);
+ mesh->conffile = NULL;
+ meshlink_errno = MESHLINK_EBUSY;
+ return false;
+ }
+
+#endif
- for(i = 0; hazahaza[i].name != NULL; i++)
- if(!strcasecmp(hazahaza[i].name, p))
- break;
+ return true;
+}
- if(!hazahaza[i].name)
- {
- syslog(LOG_ERR, _("Invalid variable name `%s' on line %d while reading config file %s"),
- p, lineno, fname);
- break;
+/// Unlock the main configuration file.
+void main_config_unlock(meshlink_handle_t *mesh) {
+ if(mesh->conffile) {
+ fclose(mesh->conffile);
+ mesh->conffile = NULL;
}
+}
- if(((q = strtok(NULL, "\t\n\r =")) == NULL) || q[0] == '#')
- {
- syslog(LOG_ERR, _("No value for variable `%s' on line %d while reading config file %s"),
- hazahaza[i].name, lineno, fname);
- break;
+/// Read a configuration file from a FILE handle.
+bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config) {
+ (void)mesh;
+ long len;
+
+ if(fseek(f, 0, SEEK_END) || !(len = ftell(f)) || fseek(f, 0, SEEK_SET)) {
+ logger(mesh, MESHLINK_ERROR, "Cannot get config file size: %s\n", strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ fclose(f);
+ return false;
}
- cfg = add_config_val(base, hazahaza[i].argtype, q);
- if(cfg == NULL)
- {
- syslog(LOG_ERR, _("Invalid value for variable `%s' on line %d while reading config file %s"),
- hazahaza[i].name, lineno, fname);
- break;
+ uint8_t *buf = xmalloc(len);
+
+ if(fread(buf, len, 1, f) != 1) {
+ logger(mesh, MESHLINK_ERROR, "Cannot read config file: %s\n", strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ fclose(f);
+ return false;
}
- cfg->which = hazahaza[i].which;
- if(!config)
- config = cfg;
- }
+ if(mesh->config_key) {
+ uint8_t *decrypted = xmalloc(len);
+ size_t decrypted_len = len;
+ chacha_poly1305_ctx_t *ctx = chacha_poly1305_init();
+ chacha_poly1305_set_key(ctx, mesh->config_key);
+
+ if(len > 12 && chacha_poly1305_decrypt_iv96(ctx, buf, buf + 12, len - 12, decrypted, &decrypted_len)) {
+ free(buf);
+ config->buf = decrypted;
+ config->len = decrypted_len;
+ return true;
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Cannot decrypt config file\n");
+ meshlink_errno = MESHLINK_ESTORAGE;
+ free(decrypted);
+ free(buf);
+ return false;
+ }
+ }
- free(buffer);
- fclose (fp);
-cp
- return err;
+ config->buf = buf;
+ config->len = len;
+
+ return true;
}
-int read_server_config()
-{
- char *fname;
- int x;
-cp
- asprintf(&fname, "%s/tinc.conf", confbase);
- x = read_config_file(&config, fname);
- if(x == -1) /* System error */
- {
- syslog(LOG_ERR, _("Failed to read `%s': %m"),
- fname);
- }
- free(fname);
-cp
- return x;
+/// Write a configuration file to a FILE handle.
+bool config_write_file(meshlink_handle_t *mesh, FILE *f, const config_t *config) {
+ if(mesh->config_key) {
+ uint8_t buf[config->len + 16];
+ size_t len = sizeof(buf);
+ uint8_t seqbuf[12];
+ randomize(&seqbuf, sizeof(seqbuf));
+ chacha_poly1305_ctx_t *ctx = chacha_poly1305_init();
+ chacha_poly1305_set_key(ctx, mesh->config_key);
+ bool success = false;
+
+ if(chacha_poly1305_encrypt_iv96(ctx, seqbuf, config->buf, config->len, buf, &len)) {
+ success = fwrite(seqbuf, sizeof(seqbuf), 1, f) == 1 && fwrite(buf, len, 1, f) == 1;
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Cannot encrypt config file\n");
+ meshlink_errno = MESHLINK_ESTORAGE;
+ }
+
+ chacha_poly1305_exit(ctx);
+ return success;
+ }
+
+ if(fwrite(config->buf, config->len, 1, f) != 1) {
+ logger(mesh, MESHLINK_ERROR, "Cannot write config file: %s", strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ return true;
}
-/*
- Look up the value of the config option type
-*/
-const config_t *get_config_val(config_t *p, which_t type)
-{
-cp
- for(; p != NULL; p = p->next)
- if(p->which == type)
- break;
-cp
- return p;
+/// Free resources of a loaded configuration file.
+void config_free(config_t *config) {
+ free((uint8_t *)config->buf);
+ config->buf = NULL;
+ config->len = 0;
}
-/*
- Remove the complete configuration tree.
-*/
-void clear_config(config_t **base)
-{
- config_t *p, *next;
-cp
- for(p = *base; p != NULL; p = next)
- {
- next = p->next;
- if(p->data.ptr && (p->argtype == TYPE_NAME))
- {
- free(p->data.ptr);
- }
- free(p);
- }
- *base = NULL;
-cp
+/// Check the presence of a host configuration file.
+bool config_exists(meshlink_handle_t *mesh, const char *name) {
+ char path[PATH_MAX];
+ make_host_path(mesh, name, path, sizeof(path));
+
+ return access(path, F_OK) == 0;
}
-int isadir(const char* f)
-{
- struct stat s;
+/// Read a host configuration file.
+bool config_read(meshlink_handle_t *mesh, const char *name, config_t *config) {
+ char path[PATH_MAX];
+ make_host_path(mesh, name, path, sizeof(path));
+
+ FILE *f = fopen(path, "r");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
+ }
- if(stat(f, &s) < 0)
- return 0;
- else
- return S_ISDIR(s.st_mode);
+ if(!config_read_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+ return true;
}
-int is_safe_path(const char *file)
-{
- char *p;
- const char *f;
- char x;
- struct stat s;
- char l[MAXBUFSIZE];
-
- if(*file != '/')
- {
- syslog(LOG_ERR, _("`%s' is not an absolute path"), file);
- return 0;
- }
-
- p = strrchr(file, '/');
-
- if(p == file) /* It's in the root */
- p++;
-
- x = *p;
- *p = '\0';
-
- f = file;
-check1:
- if(lstat(f, &s) < 0)
- {
- syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
- f);
- return 0;
- }
-
- if(s.st_uid != geteuid())
- {
- syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
- f, s.st_uid, geteuid());
- return 0;
- }
-
- if(S_ISLNK(s.st_mode))
- {
- syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
- f);
-
- if(readlink(f, l, MAXBUFSIZE) < 0)
- {
- syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
- return 0;
- }
-
- f = l;
- goto check1;
- }
-
- *p = x;
- f = file;
-
-check2:
- if(lstat(f, &s) < 0 && errno != ENOENT)
- {
- syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
- f);
- return 0;
- }
-
- if(errno == ENOENT)
- return 1;
-
- if(s.st_uid != geteuid())
- {
- syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
- f, s.st_uid, geteuid());
- return 0;
- }
-
- if(S_ISLNK(s.st_mode))
- {
- syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
- f);
-
- if(readlink(f, l, MAXBUFSIZE) < 0)
- {
- syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
- return 0;
- }
-
- f = l;
- goto check2;
- }
-
- if(s.st_mode & 0007)
- {
- /* Accessible by others */
- syslog(LOG_ERR, _("`%s' has unsecure permissions"),
- f);
- return 0;
- }
-
- return 1;
+/// Write a host configuration file.
+bool config_write(meshlink_handle_t *mesh, const char *name, const config_t *config) {
+ char path[PATH_MAX];
+ make_host_path(mesh, name, path, sizeof(path));
+
+ FILE *f = fopen(path, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
+ }
+
+ if(!config_write_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+ return true;
}
-FILE *ask_and_safe_open(const char* filename, const char* what)
-{
- FILE *r;
- char *directory;
- char *fn;
-
- /* Check stdin and stdout */
- if(!isatty(0) || !isatty(1))
- {
- /* Argh, they are running us from a script or something. Write
- the files to the current directory and let them burn in hell
- for ever. */
- fn = xstrdup(filename);
- }
- else
- {
- /* Ask for a file and/or directory name. */
- fprintf(stdout, _("Please enter a file to save %s to [%s]: "),
- what, filename);
- fflush(stdout);
-
- if((fn = readline(stdin, NULL, NULL)) == NULL)
- {
- fprintf(stderr, _("Error while reading stdin: %m\n"));
- return NULL;
+/// Read the main configuration file.
+bool main_config_read(meshlink_handle_t *mesh, config_t *config) {
+ char path[PATH_MAX];
+ make_main_path(mesh, path, sizeof(path));
+
+ FILE *f = fopen(path, "r");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
+ }
+
+ if(!config_read_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+ return true;
+}
+
+/// Write the main configuration file.
+bool main_config_write(meshlink_handle_t *mesh, const config_t *config) {
+ char path[PATH_MAX];
+ make_main_path(mesh, path, sizeof(path));
+
+ FILE *f = fopen(path, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
+ }
+
+ if(!config_write_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+ return true;
+}
+
+/// Read an invitation file, and immediately delete it.
+bool invitation_read(meshlink_handle_t *mesh, const char *name, config_t *config) {
+ char path[PATH_MAX];
+ char used_path[PATH_MAX];
+ make_invitation_path(mesh, name, path, sizeof(path));
+ make_used_invitation_path(mesh, name, used_path, sizeof(used_path));
+
+ // Atomically rename the invitation file
+ if(rename(path, used_path)) {
+ if(errno == ENOENT) {
+ logger(mesh, MESHLINK_ERROR, "Peer tried to use non-existing invitation %s\n", name);
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Error trying to rename invitation %s\n", name);
+ }
+
+ return false;
+ }
+
+ FILE *f = fopen(used_path, "r");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
}
- if(strlen(fn) == 0)
- /* User just pressed enter. */
- fn = xstrdup(filename);
- }
-
- if((strchr(fn, '/') == NULL) || (fn[0] != '/'))
- {
- /* The directory is a relative path or a filename. */
- char *p;
-
- directory = get_current_dir_name();
- asprintf(&p, "%s/%s", directory, fn);
- free(fn);
- free(directory);
- fn = p;
- }
-
- umask(0077); /* Disallow everything for group and other */
-
- /* Open it first to keep the inode busy */
- if((r = fopen(fn, "w")) == NULL)
- {
- fprintf(stderr, _("Error opening file `%s': %m\n"),
- fn);
- free(fn);
- return NULL;
- }
-
- /* Then check the file for nasty attacks */
- if(!is_safe_path(fn)) /* Do not permit any directories that are
- readable or writeable by other users. */
- {
- fprintf(stderr, _("The file `%s' (or any of the leading directories) has unsafe permissions.\n"
- "I will not create or overwrite this file.\n"),
- fn);
- fclose(r);
- free(fn);
- return NULL;
- }
-
- free(fn);
-
- return r;
+ // Check the timestamp
+ struct stat st;
+
+ if(fstat(fileno(f), &st)) {
+ logger(mesh, MESHLINK_ERROR, "Could not stat invitation file %s\n", name);
+ fclose(f);
+ unlink(used_path);
+ return false;
+ }
+
+ if(time(NULL) > st.st_mtime + mesh->invitation_timeout) {
+ logger(mesh, MESHLINK_ERROR, "Peer tried to use an outdated invitation file %s\n", name);
+ fclose(f);
+ unlink(used_path);
+ return false;
+ }
+
+ if(!config_read_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
+ fclose(f);
+ unlink(used_path);
+ return false;
+ }
+
+ fclose(f);
+ unlink(used_path);
+ return true;
+}
+
+/// Write an invitation file.
+bool invitation_write(meshlink_handle_t *mesh, const char *name, const config_t *config) {
+ char path[PATH_MAX];
+ make_invitation_path(mesh, name, path, sizeof(path));
+
+ FILE *f = fopen(path, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+ return false;
+ }
+
+ if(!config_write_file(mesh, f, config)) {
+ logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+ return true;
+}
+
+/// Purge old invitation files
+size_t invitation_purge_old(meshlink_handle_t *mesh, time_t deadline) {
+ char path[PATH_MAX];
+ make_invitation_path(mesh, "", path, sizeof(path));
+
+ DIR *dir = opendir(path);
+
+ if(!dir) {
+ logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", path, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return 0;
+ }
+
+ errno = 0;
+ size_t count = 0;
+ struct dirent *ent;
+
+ while((ent = readdir(dir))) {
+ if(strlen(ent->d_name) != 24) {
+ continue;
+ }
+
+ char invname[PATH_MAX];
+ struct stat st;
+
+ if(snprintf(invname, sizeof(invname), "%s" SLASH "%s", path, ent->d_name) >= PATH_MAX) {
+ logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", path, ent->d_name);
+ continue;
+ }
+
+ if(!stat(invname, &st)) {
+ if(mesh->invitation_key && deadline < st.st_mtime) {
+ count++;
+ } else {
+ unlink(invname);
+ }
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
+ errno = 0;
+ }
+ }
+
+ if(errno) {
+ logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", path, strerror(errno));
+ closedir(dir);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return 0;
+ }
+
+ closedir(dir);
+
+ return count;
}