From fc3ce91cf4c367d6fb867e0ae29d6102c903cd2c Mon Sep 17 00:00:00 2001
From: Michael Raitza <spacefrogg-devel@meterriblecrew.net>
Date: Sat, 5 Sep 2015 22:04:10 +0200
Subject: [PATCH] Added encrypted profile storage.

 New profile string config option .passphrase. Can contain valid weechat
 expressions such as references to secure data storage, e.g.
 "${sec.data.}", or the environment "${env:*}". Uses
 libtoxencryptsave.so for full interoperability with other clients.
---
 src/twc-config.c  |  6 +++++
 src/twc-profile.c | 61 +++++++++++++++++++++++++++++++++++++++++++----
 src/twc-profile.h |  1 +
 3 files changed, 63 insertions(+), 5 deletions(-)

diff --git a/src/twc-config.c b/src/twc-config.c
index 0d7e3f6..45e794f 100644
--- a/src/twc-config.c
+++ b/src/twc-config.c
@@ -48,6 +48,7 @@ char *twc_profile_option_names[TWC_PROFILE_NUM_OPTIONS] =
     "proxy_type",
     "udp",
     "ipv6",
+    "passphrase",
 };
 
 /**
@@ -210,6 +211,11 @@ twc_config_init_option(struct t_config_section *section,
             min = 0; max = INT_MAX;
             default_value = "100";
             break;
+        case TWC_PROFILE_OPTION_PASSPHRASE:
+            type = "string";
+            description = "passphrase for encrypted profile";
+            null_allowed = true;
+            break;
         case TWC_PROFILE_OPTION_PROXY_ADDRESS:
             type = "string";
             description = "proxy address";
diff --git a/src/twc-profile.c b/src/twc-profile.c
index 8676b41..b41b30a 100644
--- a/src/twc-profile.c
+++ b/src/twc-profile.c
@@ -24,6 +24,7 @@
 
 #include <weechat/weechat-plugin.h>
 #include <tox/tox.h>
+#include <tox/toxencryptsave.h>
 
 #include "twc.h"
 #include "twc-list.h"
@@ -83,14 +84,34 @@ twc_profile_save_data_file(struct t_twc_profile *profile)
 
   // save Tox data to a buffer
   size_t size = tox_get_savedata_size(profile->tox);
-  uint8_t *data = malloc(size);
+  uint8_t data[size];
+  uint8_t enc_data[size + TOX_PASS_ENCRYPTION_EXTRA_LENGTH];
+  uint8_t *d = data;
   tox_get_savedata(profile->tox, data);
 
+  char *pw = weechat_config_string(profile->options[TWC_PROFILE_OPTION_PASSPHRASE]);
+
+  if (pw)
+    pw = weechat_string_eval_expression(pw, NULL, NULL, NULL);
+
+  if (pw)
+    {
+      if (!tox_pass_encrypt(data, size, (uint8_t *)pw, strlen(pw), enc_data, NULL))
+        {
+          free(pw);
+          weechat_printf(profile->buffer, "error encrypting data");
+          return -1;
+        }
+      free(pw);
+      d = enc_data;
+      size += TOX_PASS_ENCRYPTION_EXTRA_LENGTH;
+    }
+
   // save buffer to a file
   FILE *file = fopen(full_path, "w");
   if (file)
     {
-      size_t saved_size = fwrite(data, 1, size, file);
+      size_t saved_size = fwrite(d, 1, size, file);
       fclose(file);
 
       return saved_size == size;
@@ -274,8 +295,8 @@ twc_profile_load(struct t_twc_profile *profile)
     // create Tox options object
     struct Tox_Options options;
 
-    tox_options_default(&options);
-    //twc_profile_set_options(options, profile);
+    //tox_options_default(&options);
+    twc_profile_set_options(&options, profile);
 
     // print a proxy message
     if (options.proxy_type != TOX_PROXY_TYPE_NONE)
@@ -300,6 +321,7 @@ twc_profile_load(struct t_twc_profile *profile)
         data_size = ftell(file);
     }
     uint8_t data[data_size];
+    uint8_t dec_data[data_size];
 
     if (file) {
         rewind(file);
@@ -311,8 +333,33 @@ twc_profile_load(struct t_twc_profile *profile)
         }
         fclose(file);
     }
+    if (data_size && tox_is_data_encrypted(data))
+    {
+        char *pw = weechat_config_string(profile->options[TWC_PROFILE_OPTION_PASSPHRASE]);
+        if (pw)
+        {
+            // evaluate password option and duplicate as tox_*_decrypt wipes it
+            pw = weechat_string_eval_expression(pw, NULL, NULL, NULL);
+        }
+
+        if (pw)
+        {
+            if (!tox_pass_decrypt(data, data_size, (uint8_t *)pw, strlen(pw), dec_data, NULL))
+            {
+                free(pw);
+                weechat_printf(profile->buffer, "%scould not decrypt Tox data file, aborting",
+                               weechat_prefix("error"));
+                return TWC_RC_ERROR;
+            }
+            free(pw);
+            data_size -= TOX_PASS_ENCRYPTION_EXTRA_LENGTH;
+        }
+        options.savedata_data = dec_data;
+    }
+    else
+        options.savedata_data = data;
+
     options.savedata_type = (data_size == 0)? TOX_SAVEDATA_TYPE_NONE: TOX_SAVEDATA_TYPE_TOX_SAVE;
-    options.savedata_data = data;
     options.savedata_length = data_size;
 
     // create Tox
@@ -321,6 +368,7 @@ twc_profile_load(struct t_twc_profile *profile)
     if (rc != TOX_ERR_NEW_OK)
     {
         twc_tox_new_print_error(profile, &options, rc);
+        profile->tox = NULL;
         return rc == TOX_ERR_NEW_MALLOC ? TWC_RC_ERROR_MALLOC : TWC_RC_ERROR;
     }
 
@@ -509,6 +557,9 @@ twc_profile_delete(struct t_twc_profile *profile,
 {
     char *data_path = twc_profile_expanded_data_path(profile);
 
+    for (size_t i = 0; i < TWC_PROFILE_NUM_OPTIONS; ++i)
+        weechat_config_option_free(profile->options[i]);
+
     twc_profile_free(profile);
 
     if (delete_data)
diff --git a/src/twc-profile.h b/src/twc-profile.h
index dbfc5ab..6518578 100644
--- a/src/twc-profile.h
+++ b/src/twc-profile.h
@@ -36,6 +36,7 @@ enum t_twc_profile_option
     TWC_PROFILE_OPTION_PROXY_TYPE,
     TWC_PROFILE_OPTION_UDP,
     TWC_PROFILE_OPTION_IPV6,
+    TWC_PROFILE_OPTION_PASSPHRASE,
 
     TWC_PROFILE_NUM_OPTIONS,
 };