Fix: copyright notices

Fix: add user input validation in backend

CMakeLists.txt

@@ -32,6 +32,7 @@ set(SOURCES
     src/mympd.c
     src/mpd_client.c
     src/list.c
+    src/validate.c
     dist/src/mongoose/mongoose.c
     dist/src/frozen/frozen.c
     dist/src/inih/ini.c

src/list.c

@@ -1,3 +1,23 @@
+/* myMPD
+   (c) 2018 Juergen Mang <mail@jcgames.de>
+   This project's homepage is: https://github.com/jcorporation/mympd
+   
+   This linked list implementation is based on: https://github.com/joshkunz/ashuffle
+   
+   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, write to the Free Software Foundation, Inc.,
+   Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>

src/list.h

@@ -1,3 +1,23 @@
+/* myMPD
+   (c) 2018 Juergen Mang <mail@jcgames.de>
+   This project's homepage is: https://github.com/jcorporation/mympd
+   
+   This linked list implementation is based on: https://github.com/joshkunz/ashuffle
+   
+   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, write to the Free Software Foundation, Inc.,
+   Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 struct node {
     char *data;
     long value;

src/mpd_client.c

@@ -33,6 +33,7 @@
 #include <mpd/client.h>
 
 #include "mpd_client.h"
+#include "validate.h"
 #include "config.h"
 #include "../dist/src/frozen/frozen.h"
 
@@ -449,6 +450,8 @@ void callback_mympd(struct mg_connection *nc, const struct mg_str msg) {
                 //rename smart playlist
                 char old_pl_file[400];
                 char new_pl_file[400];
+                sanitize_string(p_charbuf1);
+                sanitize_string(p_charbuf2);
                 snprintf(old_pl_file, 400, "%s/smartpls/%s", config.varlibdir, p_charbuf1);
                 snprintf(new_pl_file, 400, "%s/smartpls/%s", config.varlibdir, p_charbuf2);
                 if (access(old_pl_file, F_OK ) != -1) {
@@ -623,6 +626,7 @@ void callback_mympd(struct mg_connection *nc, const struct mg_str msg) {
             if (je == 1) {
                 //remove smart playlist
                 char pl_file[400];
+                sanitize_string(p_charbuf1);
                 snprintf(pl_file, 400, "%s/smartpls/%s", config.varlibdir, p_charbuf1);
                 if (access(pl_file, F_OK ) != -1 )
                     unlink(pl_file);
@@ -1353,6 +1357,7 @@ bool mympd_state_get(char *name, char *value) {
     size_t n = 0;
     ssize_t read;
     
+    sanitize_string(name);
     snprintf(cfgfile, 400, "%s/state/%s", config.varlibdir, name);
     FILE *fp = fopen(cfgfile, "r");
     if (fp == NULL) {
@@ -1374,6 +1379,8 @@ bool mympd_state_get(char *name, char *value) {
 bool mympd_state_set(const char *name, const char *value) {
     char tmpfile[400];
     char cfgfile[400];
+    
+    sanitize_string(name);
     snprintf(cfgfile, 400, "%s/state/%s", config.varlibdir, name);
     snprintf(tmpfile, 400, "%s/tmp/%s", config.varlibdir, name);
         
@@ -1395,6 +1402,7 @@ int mympd_syscmd(char *buffer, char *cmd, int order) {
     size_t n = 0;
     ssize_t read;
     
+    sanitize_string(cmd);
     snprintf(filename, 400, "%s/syscmds/%d%s", config.etcdir, order, cmd);
     FILE *fp = fopen(filename, "r");    
     if (fp == NULL) {
@@ -1878,6 +1886,7 @@ int mympd_put_browse(char *buffer, char *path, unsigned int offset, char *filter
                     ) {
                         if (entities_returned++) 
                             len += json_printf(&out, ",");
+                        sanitize_string(plName);
                         snprintf(smartpls_file, 400, "%s/smartpls/%s", config.varlibdir, plName);
                         if (access(smartpls_file, F_OK ) != -1)
                             smartpls = true;
@@ -2050,6 +2059,7 @@ int mympd_put_playlists(char *buffer, unsigned int offset, char *filter) {
                 if (entities_returned++)
                     len += json_printf(&out, ", ");
                 snprintf(smartpls_file, 400, "%s/smartpls/%s", config.varlibdir, plpath);
+                sanitize_string(plpath);
                 if (access(smartpls_file, F_OK ) != -1)
                     smartpls = true;
                 else
@@ -2116,6 +2126,7 @@ int mympd_put_playlist_list(char *buffer, char *uri, unsigned int offset, char *
         }
         mpd_entity_free(entity);
     }
+    sanitize_string(uri);
     snprintf(smartpls_file, 400, "%s/smartpls/%s", config.varlibdir, uri);
     if (access(smartpls_file, F_OK ) != -1)
         smartpls = true;
@@ -2392,6 +2403,7 @@ int mympd_smartpls_put(char *buffer, char *playlist) {
     int len = 0;
     struct json_out out = JSON_OUT_BUF(buffer, MAX_SIZE);
     
+    sanitize_string(playlist);
     snprintf(pl_file, 400, "%s/smartpls/%s", config.varlibdir, playlist);
     char *content = json_fread(pl_file);
     je = json_scanf(content, strlen(content), "{type: %Q }", &smartpltype);
@@ -2436,6 +2448,7 @@ int mympd_smartpls_put(char *buffer, char *playlist) {
 int mympd_smartpls_save(char *smartpltype, char *playlist, char *tag, char *searchstr, int maxentries, int timerange) {
     char tmp_file[400];
     char pl_file[400];
+    sanitize_string(playlist);
     snprintf(tmp_file, 400, "%s/tmp/%s", config.varlibdir, playlist);
     snprintf(pl_file, 400, "%s/smartpls/%s", config.varlibdir, playlist);
     if (strcmp(smartpltype, "sticker") == 0) {

src/validate.c

@@ -0,0 +1,55 @@
+/* myMPD
+   (c) 2018 Juergen Mang <mail@jcgames.de>
+   This project's homepage is: https://github.com/jcorporation/mympd
+   
+   myMPD ist fork of:
+   
+   ympd
+   (c) 2013-2014 Andrew Karpow <andy@ndyk.de>
+   This project's homepage is: http://www.ympd.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
+   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, write to the Free Software Foundation, Inc.,
+   Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <stdio.h>
+#include "validate.h"
+
+void sanitize_string(const char *data) {
+    static char ok_chars[] = "abcdefghijklmnopqrstuvwxyz"
+                             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                             "1234567890_-. ";
+    char *cp = data;
+    const char *end = data + strlen(data);
+    for (cp += strspn(cp, ok_chars); cp != end; cp += strspn(cp, ok_chars))
+        *cp = '_';
+}
+
+int validate_path(char *path, const char *basepath) {
+    char *rpath = NULL;
+    char *ptr;
+    ptr = realpath(path, rpath);
+    if (ptr == NULL)
+        return 1;
+    if (strncmp(basepath, ptr, strlen(basepath)) == 0) {
+        free(rpath);
+        return 0;
+    }
+    else {
+        free(rpath);
+        return 1;
+    }
+}

src/validate.h

@@ -0,0 +1,26 @@
+/* myMPD
+   (c) 2018 Juergen Mang <mail@jcgames.de>
+   This project's homepage is: https://github.com/jcorporation/mympd
+   
+   myMPD ist fork of:
+   
+   ympd
+   (c) 2013-2014 Andrew Karpow <andy@ndyk.de>
+   This project's homepage is: http://www.ympd.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
+   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, write to the Free Software Foundation, Inc.,
+   Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+void sanitize_string(const char *data);
+int validate_path(char *path, const char *basepath);