├── README.md ├── pidgin ├── .gitignore ├── COPYING ├── Makefile ├── README.md ├── cpim.c ├── cpim.h ├── gpg.c ├── gpg.h ├── kontalk.c ├── kontalk.h ├── tunnel.c └── tunnel.h └── tunnel ├── README.md └── ssl_bridge.py /README.md: -------------------------------------------------------------------------------- 1 | Kontalk client adapters 2 | ======================= 3 | 4 | This is a collection of some client adapters for Kontalk (mainly because of 5 | the need for client certificate authentication). 6 | 7 | It includes: 8 | 9 | * generic SSL tunnel script 10 | * Pidgin plugin 11 | 12 | If you want to use Pidgin on the Kontalk network please refer to the 13 | Wiki page [How to configure Pidgin for Kontalk](//github.com/kontalk/client-adapters/wiki/Configure-Pidgin-for-Kontalk) 14 | -------------------------------------------------------------------------------- /pidgin/.gitignore: -------------------------------------------------------------------------------- 1 | *.so 2 | *.o 3 | -------------------------------------------------------------------------------- /pidgin/COPYING: -------------------------------------------------------------------------------- 1 | 2 | GNU GENERAL PUBLIC LICENSE 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The GNU General Public License is a free, copyleft license for 12 | software and other kinds of works. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 614 | 615 | If the disclaimer of warranty and limitation of liability provided 616 | above cannot be given local legal effect according to their terms, 617 | reviewing courts shall apply local law that most closely approximates 618 | an absolute waiver of all civil liability in connection with the 619 | Program, unless a warranty or assumption of liability accompanies a 620 | copy of the Program in return for a fee. 621 | 622 | END OF TERMS AND CONDITIONS 623 | 624 | How to Apply These Terms to Your New Programs 625 | 626 | If you develop a new program, and you want it to be of the greatest 627 | possible use to the public, the best way to achieve this is to make it 628 | free software which everyone can redistribute and change under these terms. 629 | 630 | To do so, attach the following notices to the program. It is safest 631 | to attach them to the start of each source file to most effectively 632 | state the exclusion of warranty; and each file should have at least 633 | the "copyright" line and a pointer to where the full notice is found. 634 | 635 | 636 | Copyright (C) 637 | 638 | This program is free software: you can redistribute it and/or modify 639 | it under the terms of the GNU General Public License as published by 640 | the Free Software Foundation, either version 3 of the License, or 641 | (at your option) any later version. 642 | 643 | This program is distributed in the hope that it will be useful, 644 | but WITHOUT ANY WARRANTY; without even the implied warranty of 645 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 646 | GNU General Public License for more details. 647 | 648 | You should have received a copy of the GNU General Public License 649 | along with this program. If not, see . 650 | 651 | Also add information on how to contact you by electronic and paper mail. 652 | 653 | If the program does terminal interaction, make it output a short 654 | notice like this when it starts in an interactive mode: 655 | 656 | Copyright (C) 657 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 658 | This is free software, and you are welcome to redistribute it 659 | under certain conditions; type `show c' for details. 660 | 661 | The hypothetical commands `show w' and `show c' should show the appropriate 662 | parts of the General Public License. Of course, your program's commands 663 | might be different; for a GUI interface, you would use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or school, 666 | if any, to sign a "copyright disclaimer" for the program, if necessary. 667 | For more information on this, and how to apply and follow the GNU GPL, see 668 | . 669 | 670 | The GNU General Public License does not permit incorporating your program 671 | into proprietary programs. If your program is a subroutine library, you 672 | may consider it more useful to permit linking proprietary applications with 673 | the library. If this is what you want to do, use the GNU Lesser General 674 | Public License instead of this License. But first, please read 675 | . 676 | 677 | -------------------------------------------------------------------------------- /pidgin/Makefile: -------------------------------------------------------------------------------- 1 | # Makefile for Kontalk Pidgin plugin 2 | 3 | PACKAGE_NAME = "kontalk" 4 | PACKAGE_VERSION = "0.2" 5 | 6 | PREFIX = "/usr" 7 | LOCALEDIR = "$(PREFIX)/locale" 8 | 9 | BIN = kontalk.so 10 | OBJS = gpg.o cpim.o tunnel.o kontalk.o 11 | PKGCONFIG_DEPS = pidgin 12 | CC = gcc -c 13 | LD = gcc 14 | CFLAGS = -Wall -fPIC \ 15 | -DPACKAGE_NAME=\"$(PACKAGE_NAME)\" \ 16 | -DPACKAGE_VERSION=\"$(PACKAGE_VERSION)\" \ 17 | -DENABLE_NLS \ 18 | -DGETTEXT_PACKAGE=\"$(PACKAGE_NAME)\" \ 19 | -DLOCALEDIR=\"$(LOCALEDIR)\" \ 20 | -D_FILE_OFFSET_BITS=64 \ 21 | -D_GNU_SOURCE \ 22 | `pkg-config --cflags $(PKGCONFIG_DEPS)` \ 23 | `gpgme-config --cflags` 24 | LDFLAGS = -shared -fPIC `pkg-config --libs $(PKGCONFIG_DEPS)` `gpgme-config --libs` 25 | 26 | 27 | all: $(BIN) 28 | 29 | install: all 30 | strip $(BIN) 31 | install $(BIN) ~/.purple/plugins 32 | 33 | clean: 34 | rm -f $(BIN) $(OBJS) 35 | 36 | $(BIN): $(OBJS) 37 | $(LD) -o $(BIN) $(OBJS) $(LDFLAGS) 38 | 39 | .c.o: 40 | $(CC) $(CFLAGS) -o $@ $< 41 | -------------------------------------------------------------------------------- /pidgin/README.md: -------------------------------------------------------------------------------- 1 | Pidgin plugin 2 | ============= 3 | 4 | This is a plugin for Pidgin. It provides support for: 5 | 6 | - [x] Authentication (provided by tunnel script) 7 | - [x] Encryption 8 | - [x] Key retrieval 9 | - [x] Rename users using name from key 10 | - [x] Media support (receive only) 11 | - [ ] Picture thumbnail 12 | - [ ] Registration 13 | 14 | ## Build 15 | 16 | The command below will install the plugin in your home directory under 17 | `~/.purple/plugins`. You'll need Pidgin and GPGME development headers to compile it. 18 | 19 | ``` 20 | make install 21 | ``` 22 | 23 | 24 | ## Usage 25 | 26 | By activating this plugin you will have automatic encryption/decryption for 27 | both incoming and outgoing messages plus automatic public key retrieval and 28 | import into your GnuPG keyring. Buddies with unset name will be renamed with 29 | the name found in the public key. 30 | 31 | To enable encryption for outgoing messages, you need to import your personal 32 | key pair (`kontalk-public.asc` and `kontalk-private.asc` from your personal key 33 | archive exported from the app) into GnuPG. 34 | Take note of the main key ID and paste it into the plugin preferences window. 35 | From that point on, Pidgin will start to encrypt outgoing messages, where 36 | possible, and decrypt incoming messages. 37 | 38 | 39 | ## Authentication support 40 | 41 | Kontalk authentication is not supported by Pidgin. We provide two ways to support it. 42 | 43 | The first and most compatible way is the Python script hosted in this repository 44 | in the `tunnel` directory. Please refer to its README file for instructions. 45 | 46 | The second and more easy way relies on the sole plugin. The plugin itself is able 47 | to create a tunnel internally much like the Python script does, but without starting 48 | any other program. Unfortunately, our dependency GLib is linked against GnuTLS which 49 | has issues with our login certificate. Therefore, you'll need to compile 50 | [another GLib module with OpenSSL support](https://github.com/GNOME/glib-openssl). 51 | After that, it's just a matter of telling the plugin where to take the certificate 52 | and the private key, host and port to connect to and the port to listen for 53 | connections from Pidgin (pretty much what the Python script asks). 54 | 55 | You can disable the internal tunnel of the plugin by setting the listening port 56 | to 0 (default). 57 | 58 | 59 | ## Additional features 60 | 61 | You can have support for delivery receipts using another plugin also forked here: [pidgin-xmpp-receipts](//github.com/kontalk/pidgin-xmpp-receipts) 62 | -------------------------------------------------------------------------------- /pidgin/cpim.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #include "cpim.h" 20 | #include "kontalk.h" 21 | 22 | #include 23 | #include 24 | #include 25 | 26 | #define HEADER_CONTENT_TYPE "Content-type" 27 | #define MESSAGE_CONTENT_TYPE "Message/CPIM" 28 | #define TEXT_CONTENT_TYPE "text/plain" 29 | 30 | #define CPIM_MESSAGE_TEMPLATE \ 31 | HEADER_CONTENT_TYPE ": " MESSAGE_CONTENT_TYPE "\n" \ 32 | "\n" \ 33 | "From: %s\n" \ 34 | "To: %s\n" \ 35 | "DateTime: %s\n" \ 36 | "\n" \ 37 | HEADER_CONTENT_TYPE ": %s%s\n" \ 38 | "\n" \ 39 | "%s" 40 | 41 | 42 | static char * 43 | readline(char *text, char **next) 44 | { 45 | char *newline = strchr(text, '\n'); 46 | if (newline != NULL) { 47 | *newline = '\0'; 48 | *next = newline + 1; 49 | } 50 | return text; 51 | } 52 | 53 | static char * 54 | parse_header(const char *header, char **name) 55 | { 56 | char *sep = strchr(header, ':'); 57 | if (sep != NULL) { 58 | *name = g_strndup(header, sep-header); 59 | return g_strstrip(g_strdup(sep+1)); 60 | } 61 | 62 | return NULL; 63 | } 64 | 65 | void 66 | cpim_message_free(cpim_message *msg) 67 | { 68 | if (msg != NULL) { 69 | g_free(msg->from); 70 | g_free(msg->to); 71 | g_free(msg->timestamp); 72 | g_free(msg->type); 73 | g_free(msg->body); 74 | g_free(msg); 75 | } 76 | } 77 | 78 | cpim_message * 79 | cpim_parse_message(const char *text, size_t len) 80 | { 81 | cpim_message *msg = g_malloc0(sizeof(cpim_message)); 82 | 83 | char *buf = g_strndup(text, len); 84 | char *ptr = buf; 85 | char *key = NULL; 86 | char *value; 87 | char *line; 88 | int parse_ok; 89 | 90 | line = readline(ptr, &ptr); 91 | value = parse_header(line, &key); 92 | 93 | parse_ok = (value != NULL && !strcasecmp(key, HEADER_CONTENT_TYPE) && !strcasecmp(value, MESSAGE_CONTENT_TYPE)); 94 | g_free((gpointer) value); 95 | g_free((gpointer) key); 96 | 97 | if (parse_ok) { 98 | line = readline(ptr, &ptr); 99 | if (!strlen(g_strstrip(line))) { 100 | do { 101 | value = parse_header(line, &key); 102 | if (value != NULL) { 103 | if (!strcasecmp(key, "from")) { 104 | msg->from = value; 105 | } 106 | else if (!strcasecmp(key, "to")) { 107 | msg->to = value; 108 | } 109 | else if (!strcasecmp(key, "datetime")) { 110 | msg->timestamp = value; 111 | } 112 | else { 113 | // useless header 114 | g_free(value); 115 | } 116 | 117 | g_free(key); 118 | } 119 | line = readline(ptr, &ptr); 120 | 121 | } while (strlen(g_strstrip(line))); 122 | 123 | // content type here must be plain text 124 | line = readline(ptr, &ptr); 125 | key = NULL; 126 | value = parse_header(line, &key); 127 | msg->type = value; 128 | 129 | parse_ok = (value != NULL && !strcasecmp(key, HEADER_CONTENT_TYPE)); 130 | g_free((gpointer) key); 131 | 132 | if (parse_ok) { 133 | // read the empty line 134 | line = readline(ptr, &ptr); 135 | if (!strlen(g_strstrip(line))) { 136 | msg->body = g_strdup(ptr); 137 | } 138 | 139 | return msg; 140 | } 141 | } 142 | } 143 | 144 | //fail: 145 | g_free(buf); 146 | cpim_message_free(msg); 147 | return NULL; 148 | } 149 | 150 | char * 151 | cpim_message_create_text(const char *body, const char *from, const char *to, const char *timestamp) 152 | { 153 | return g_strdup_printf(CPIM_MESSAGE_TEMPLATE, 154 | from, 155 | to, 156 | timestamp, 157 | TEXT_CONTENT_TYPE, 158 | "; charset=utf-8", 159 | body); 160 | } 161 | -------------------------------------------------------------------------------- /pidgin/cpim.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #ifndef _CPIM_H_ 20 | #define _CPIM_H_ 21 | 22 | #include 23 | 24 | typedef struct { 25 | char *from; 26 | char *to; 27 | char *timestamp; 28 | char *type; 29 | 30 | char *body; 31 | } cpim_message; 32 | 33 | void cpim_message_free(cpim_message *msg); 34 | 35 | cpim_message *cpim_parse_message(const char *text, size_t len); 36 | 37 | char *cpim_message_create_text(const char *body, const char *from, const char *to, const char *timestamp); 38 | 39 | #endif /* _CPIM_H_ */ 40 | -------------------------------------------------------------------------------- /pidgin/gpg.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #include 20 | 21 | #include 22 | 23 | #include "gpg.h" 24 | #include "kontalk.h" 25 | 26 | 27 | static gpgme_ctx_t ctx; 28 | 29 | 30 | gboolean 31 | gpg_init() 32 | { 33 | gboolean check = gpgme_check_version(GPGME_REQUIRED_VERSION) != NULL; 34 | if (check) { 35 | gpgme_error_t err = gpgme_new(&ctx); 36 | if (err) { 37 | purple_debug_fatal(PACKAGE_NAME, "cannot allocate GPGME context!\n"); 38 | return FALSE; 39 | } 40 | } 41 | 42 | return check; 43 | } 44 | 45 | void 46 | gpg_free() 47 | { 48 | gpgme_release(ctx); 49 | } 50 | 51 | static gpgme_error_t 52 | gpg_get_key(const char *pattern, gpgme_key_t *key, int secret_only) 53 | { 54 | gpgme_error_t err; 55 | 56 | err = gpgme_op_keylist_start(ctx, pattern, secret_only); 57 | if (err) 58 | goto end; 59 | 60 | err = gpgme_op_keylist_next(ctx, key); 61 | if (err) 62 | goto end; 63 | 64 | end: 65 | gpgme_op_keylist_end(ctx); 66 | return err; 67 | } 68 | 69 | char * 70 | gpg_get_userid(const char *pattern, int secret_only) 71 | { 72 | gpgme_error_t err; 73 | gpgme_key_t key = NULL; 74 | char *uid = NULL; 75 | 76 | err = gpg_get_key(pattern, &key, secret_only); 77 | if (err) 78 | goto end; 79 | 80 | if (key->uids->uid != NULL) 81 | uid = strdup(key->uids->uid); 82 | 83 | end: 84 | if (key != NULL) 85 | gpgme_key_unref(key); 86 | return uid; 87 | } 88 | 89 | // TODO this should return an error like gpg_encrypt 90 | char * 91 | gpg_decrypt(void *data, size_t size, size_t *out_size) 92 | { 93 | gpgme_data_t cipher, plain; 94 | gpgme_data_new_from_mem(&cipher, data, size, 0); 95 | gpgme_data_new(&plain); 96 | 97 | gpgme_error_t err = gpgme_op_decrypt_verify(ctx, cipher, plain); 98 | gpgme_data_release(cipher); 99 | if (err) { 100 | purple_debug_error(PACKAGE_NAME, "cannot decrypt data!\n"); 101 | gpgme_data_release(plain); 102 | return NULL; 103 | } 104 | 105 | return gpgme_data_release_and_get_mem(plain, out_size); 106 | } 107 | 108 | void 109 | gpg_data_free(void *data) 110 | { 111 | if (data != NULL) 112 | gpgme_free(data); 113 | } 114 | 115 | gpgme_error_t 116 | gpg_encrypt(const char *rcpt, const char *signer, char *data, size_t size, char **out, size_t *out_size) 117 | { 118 | gpgme_key_t key_sign = NULL, key_encrypt = NULL; 119 | gpgme_data_t cipher = NULL, plain = NULL; 120 | gpgme_error_t err; 121 | 122 | // clear any previous signers 123 | gpgme_signers_clear(ctx); 124 | 125 | // find our signing key 126 | err = gpg_get_key(signer, &key_sign, 1); 127 | if (err) { 128 | purple_debug_warning(PACKAGE_NAME, "cannot find secret key!\n"); 129 | goto end; 130 | } 131 | 132 | gpgme_signers_add(ctx, key_sign); 133 | 134 | // find encryption key 135 | err = gpg_get_key(rcpt, &key_encrypt, 0); 136 | if (err) { 137 | purple_debug_warning(PACKAGE_NAME, "cannot find encryption key!\n"); 138 | goto end; 139 | } 140 | 141 | // prepare buffers 142 | gpgme_data_new_from_mem(&plain, data, size, 0); 143 | gpgme_data_new(&cipher); 144 | 145 | gpgme_key_t recp[] = { key_encrypt, NULL }; 146 | // WARNING working around trust 147 | err = gpgme_op_encrypt_sign(ctx, recp, GPGME_ENCRYPT_ALWAYS_TRUST, plain, cipher); 148 | if (err) { 149 | gpgme_data_release(cipher); 150 | purple_debug_warning(PACKAGE_NAME, "encryption error!\n"); 151 | goto end; 152 | } 153 | 154 | *out = gpgme_data_release_and_get_mem(cipher, out_size); 155 | return GPG_ERR_NO_ERROR; 156 | 157 | end: 158 | if (plain != NULL) 159 | gpgme_data_release(plain); 160 | if (key_sign != NULL) 161 | gpgme_key_unref(key_sign); 162 | if (key_encrypt != NULL) 163 | gpgme_key_unref(key_encrypt); 164 | return err; 165 | } 166 | 167 | const char * 168 | gpg_import_key(void *keydata, size_t size) 169 | { 170 | gpgme_data_t dh; 171 | gpgme_data_new_from_mem(&dh, keydata, size, 0); 172 | 173 | gpgme_error_t err = gpgme_op_import(ctx, dh); 174 | gpgme_data_release(dh); 175 | if (err) { 176 | purple_debug_error(PACKAGE_NAME, "cannot import key!\n"); 177 | return NULL; 178 | } 179 | 180 | gpgme_import_result_t result = gpgme_op_import_result(ctx); 181 | if (result != NULL && (result->imported > 0 || result->unchanged > 0)) { 182 | return result->imports->fpr; 183 | } 184 | 185 | return NULL; 186 | } 187 | -------------------------------------------------------------------------------- /pidgin/gpg.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #ifndef _GPG_H_ 20 | #define _GPG_H_ 21 | 22 | #include 23 | #include 24 | 25 | #define GPGME_REQUIRED_VERSION "1.4.3" 26 | 27 | gboolean gpg_init(); 28 | void gpg_free(); 29 | 30 | char *gpg_get_userid(const char *pattern, int secret_only); 31 | 32 | char *gpg_decrypt(void *data, size_t size, size_t *out_size); 33 | 34 | gpgme_error_t gpg_encrypt(const char *rcpt, const char *signer, char *data, size_t size, char **out, size_t *out_size); 35 | 36 | void gpg_data_free(void *data); 37 | 38 | const char *gpg_import_key(void *keydata, size_t size); 39 | 40 | #endif /* _GPG_H_ */ 41 | -------------------------------------------------------------------------------- /pidgin/kontalk.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #define PURPLE_PLUGINS 20 | 21 | #include 22 | 23 | #include 24 | #include 25 | 26 | #include 27 | #include 28 | #include 29 | #include 30 | #include 31 | 32 | #include "kontalk.h" 33 | #include "gpg.h" 34 | #include "cpim.h" 35 | #include "tunnel.h" 36 | 37 | 38 | #define SECRET_KEY_PREF "/plugins/gtk/" PACKAGE_NAME "/secret_key" 39 | #define TUN_PORT_PREF "/plugins/gtk/" PACKAGE_NAME "/tun_port" 40 | #define TUN_RELAY_HOST_PREF "/plugins/gtk/" PACKAGE_NAME "/tun_relay_host" 41 | #define TUN_RELAY_PORT_PREF "/plugins/gtk/" PACKAGE_NAME "/tun_relay_port" 42 | #define TUN_CERTIFICATE_PREF "/plugins/gtk/" PACKAGE_NAME "/tun_certificate" 43 | #define TUN_PRIVATE_KEY_PREF "/plugins/gtk/" PACKAGE_NAME "/tun_private_key" 44 | 45 | // this is completely safe since Pidgin is not multithread 46 | #define TIMESTAMP_LEN 25 47 | static char timestamp_buffer[TIMESTAMP_LEN+1] = {0, }; 48 | #define TIMESTAMP_FORMAT "%Y-%m-%dT%H:%M:%S%z" 49 | 50 | static char * 51 | extract_oob_url(xmlnode *message) 52 | { 53 | xmlnode *oob = xmlnode_get_child_with_namespace(message, "x", "jabber:x:oob"); 54 | if (oob != NULL) { 55 | xmlnode *url = xmlnode_get_child(oob, "url"); 56 | if (url != NULL) { 57 | return xmlnode_get_data(url); 58 | } 59 | } 60 | 61 | return NULL; 62 | } 63 | 64 | static xmlnode * 65 | parse_xmpp_stanza(const char *text, gssize size) 66 | { 67 | xmlnode *child = NULL; 68 | xmlnode *doc = xmlnode_from_str(text, size); 69 | if (doc != NULL && 70 | !strcmp(doc->name, XMPP_ELEMENT) && 71 | !strcmp(xmlnode_get_namespace(doc), XMPP_NAMESPACE)) { 72 | 73 | child = doc->child; 74 | while (child != NULL) { 75 | if (child->name != NULL) { 76 | child = xmlnode_copy(child); 77 | break; 78 | } 79 | child = child->next; 80 | } 81 | } 82 | 83 | if (doc != NULL) { 84 | xmlnode_free(doc); 85 | } 86 | 87 | return child; 88 | } 89 | 90 | static char * 91 | jabber_get_bare_jid(const char *in) 92 | { 93 | if (in != NULL) { 94 | char *out = g_strdup(in); 95 | char *sep = strstr(out, "/"); 96 | if (sep != NULL) { 97 | *sep = '\0'; 98 | } 99 | return out; 100 | } 101 | 102 | return NULL; 103 | } 104 | 105 | static char * 106 | jabber_get_domain(const char *in) 107 | { 108 | if (in != NULL) { 109 | char *sep = strstr(in, "@"); 110 | if (sep != NULL) { 111 | sep = g_strdup(sep+1); 112 | char *end = strstr(sep, "/"); 113 | if (end != NULL) { 114 | *end = '\0'; 115 | } 116 | return sep; 117 | } 118 | } 119 | 120 | return NULL; 121 | } 122 | 123 | 124 | static char* 125 | generate_next_id() 126 | { 127 | static guint32 index = 0; 128 | 129 | if (index == 0) { 130 | do { 131 | index = g_random_int(); 132 | } while (index == 0); 133 | } 134 | 135 | return g_strdup_printf("purple%x", index++); 136 | } 137 | 138 | static void 139 | request_public_key(PurpleConnection *pc, const char *jid) 140 | { 141 | char *id = generate_next_id(); 142 | 143 | xmlnode *iq = xmlnode_new("iq"); 144 | xmlnode_set_attrib(iq, "type", "get"); 145 | xmlnode_set_attrib(iq, "to", jid); 146 | xmlnode_set_attrib(iq, "id", id); 147 | g_free(id); 148 | 149 | xmlnode *pubkey = xmlnode_new_child(iq, PUBKEY_ELEMENT); 150 | xmlnode_set_namespace(pubkey, PUBKEY_NAMESPACE); 151 | 152 | purple_signal_emit(purple_connection_get_prpl(pc), "jabber-sending-xmlnode", 153 | pc, &iq); 154 | 155 | xmlnode_free(iq); 156 | } 157 | 158 | static void 159 | append_to_tooltip(PurpleBlistNode *node, GString *text, gboolean full) 160 | { 161 | if (full) { 162 | const gchar *note = purple_blist_node_get_string(node, "fingerprint"); 163 | 164 | if ((note != NULL) && (*note != '\0')) { 165 | char *tmp, *esc; 166 | purple_markup_html_to_xhtml(note, NULL, &tmp); 167 | esc = g_markup_escape_text(tmp, -1); 168 | g_free(tmp); 169 | g_string_append_printf(text, _("\nFingerprint: %s"), esc); 170 | g_free(esc); 171 | } 172 | } 173 | } 174 | 175 | static void 176 | request_key_cb(PurpleBlistNode *node, gpointer data) 177 | { 178 | if (PURPLE_BLIST_NODE_IS_BUDDY(node)) { 179 | PurpleBuddy *b = (PurpleBuddy *) node; 180 | request_public_key(purple_account_get_connection(purple_buddy_get_account(b)), 181 | purple_buddy_get_name(b)); 182 | } 183 | } 184 | 185 | static void 186 | extended_menu_cb(PurpleBlistNode *node, GList **m) 187 | { 188 | PurpleMenuAction *bna = NULL; 189 | 190 | if (purple_blist_node_get_flags(node) & PURPLE_BLIST_NODE_FLAG_NO_SAVE) 191 | return; 192 | 193 | if (PURPLE_BLIST_NODE_IS_BUDDY(node)) { 194 | *m = g_list_append(*m, bna); 195 | bna = purple_menu_action_new(_("Request key"), PURPLE_CALLBACK(request_key_cb), NULL, NULL); 196 | *m = g_list_append(*m, bna); 197 | } 198 | } 199 | 200 | static void 201 | xmlnode_replace_data(xmlnode *node, const char *text, size_t len) 202 | { 203 | xmlnode *c; 204 | 205 | for(c = node->child; c; c = c->next) { 206 | if(c->type == XMLNODE_TYPE_DATA) { 207 | g_free(c->data); 208 | size_t text_len = (len == -1) ? strlen(text) : len; 209 | c->data = g_memdup(text, text_len); 210 | c->data_sz = text_len; 211 | break; 212 | } 213 | } 214 | } 215 | 216 | static gboolean 217 | jid_localpart_equal(const char* jid, const char* localpart) 218 | { 219 | gboolean ret = FALSE; 220 | char* jid2 = NULL; 221 | char* domain = jabber_get_domain(jid); 222 | if (domain != NULL) { 223 | jid2 = g_strdup_printf("%s@%s", localpart, domain); 224 | g_assert(jid2 != NULL); 225 | 226 | ret = (strcasecmp(jid, jid2) == 0); 227 | } 228 | 229 | g_free(domain); 230 | g_free(jid2); 231 | return ret; 232 | } 233 | 234 | static const char * 235 | gpg_userid_get_name(const char* uid) 236 | { 237 | char *sep = strstr(uid, " <"); 238 | if (sep != NULL) { 239 | *sep = '\0'; 240 | return uid; 241 | } 242 | 243 | return NULL; 244 | } 245 | 246 | static gboolean 247 | rename_user_from_key(PurpleAccount *account, const char *jid, const char *fingerprint) 248 | { 249 | gboolean ret = FALSE; 250 | 251 | // lookup contact in blist 252 | PurpleBuddy *buddy = purple_find_buddy(account, jid); 253 | if (buddy != NULL) { 254 | const char* alias = purple_buddy_get_alias(buddy); 255 | 256 | // server could automatically set the name to the JID or to its localpart 257 | if (alias == NULL || !strcasecmp(jid, alias) || jid_localpart_equal(jid, alias)) { 258 | // extract UID from key 259 | char *uid = gpg_get_userid(fingerprint, 0); 260 | if (uid != NULL) { 261 | // modifies the string in place 262 | const char *name = gpg_userid_get_name(uid); 263 | 264 | if (name != NULL) { 265 | // set local alias 266 | purple_blist_alias_buddy(buddy, name); 267 | serv_alias_buddy(buddy); 268 | purple_debug_misc(PACKAGE_NAME, "user %s renamed to \"%s\"\n", 269 | jid, name); 270 | ret = TRUE; 271 | } 272 | 273 | free(uid); 274 | } 275 | } 276 | } 277 | 278 | return ret; 279 | } 280 | 281 | static gboolean 282 | jabber_iq_received(PurpleConnection *pc, const char *type, const char *id, 283 | const char *from, xmlnode *iq) 284 | { 285 | xmlnode *pubkey; 286 | if (from != NULL && !g_strcmp0(type, "result") && 287 | (pubkey = xmlnode_get_child_with_namespace(iq, PUBKEY_ELEMENT, PUBKEY_NAMESPACE)) != NULL) { 288 | 289 | // just import the key for now 290 | char* keydata = xmlnode_get_data(pubkey); 291 | if (keydata != NULL && *(g_strchomp(keydata)) != '\0') { 292 | size_t len; 293 | g_base64_decode_inplace(keydata, &len); 294 | 295 | if (len > 0) { 296 | const char* fingerprint = gpg_import_key((void*) keydata, len); 297 | if (fingerprint == NULL) { 298 | purple_debug_warning(PACKAGE_NAME, "error importing public key for %s\n", 299 | from); 300 | } 301 | else { 302 | // create a copy of the string since this appears to go somewhere 303 | fingerprint = g_strdup(fingerprint); 304 | purple_debug_misc(PACKAGE_NAME, "public key for %s imported (fingerprint %s)\n", 305 | from, fingerprint ? fingerprint : "(null)"); 306 | // rename the user if necessary 307 | rename_user_from_key(purple_connection_get_account(pc), from, fingerprint); 308 | g_free((char *) fingerprint); 309 | } 310 | } 311 | } 312 | 313 | g_free((gpointer) keydata); 314 | 315 | // packet was processed 316 | return TRUE; 317 | } 318 | 319 | // continue processing 320 | return FALSE; 321 | } 322 | 323 | static gboolean 324 | jabber_message_received(PurpleConnection *pc, const char *type, const char *id, 325 | const char *from, const char *to, xmlnode *message) 326 | { 327 | xmlnode *e2e, *body; 328 | if (from != NULL && !g_strcmp0(type, "chat") && 329 | (e2e = xmlnode_get_child_with_namespace(message, E2E_ELEMENT, E2E_NAMESPACE)) != NULL) { 330 | 331 | // extract and decode e2e content 332 | char *data = xmlnode_get_data(e2e); 333 | if (data != NULL && *(g_strchomp(data)) != '\0') { 334 | size_t len, out_len; 335 | g_base64_decode_inplace(data, &len); 336 | 337 | if (len > 0) { 338 | // decrypt! 339 | char *text = gpg_decrypt((void *) data, len, &out_len); 340 | if (text != NULL && (body = xmlnode_get_child(message, "body")) != NULL) { 341 | char *body_text, *url = NULL; 342 | size_t body_len; 343 | 344 | // parse Message/CPIM 345 | cpim_message *msg = cpim_parse_message(text, out_len); 346 | if (msg != NULL) { 347 | // TODO check security status 348 | body_text = msg->body; 349 | body_len = strlen(msg->body); 350 | 351 | if (msg->type != NULL && g_str_has_prefix(msg->type, XMPP_CONTENT_TYPE)) { 352 | xmlnode *stanza = parse_xmpp_stanza(body_text, body_len); 353 | if (stanza != NULL && !strcmp(stanza->name, "message")) { 354 | // look for out-of-band 355 | url = extract_oob_url(stanza); 356 | if (url != NULL) { 357 | body_text = url; 358 | body_len = strlen(url); 359 | } 360 | } 361 | } 362 | } 363 | else { 364 | body_text = text; 365 | body_len = out_len; 366 | } 367 | 368 | // inject into body 369 | // WARNING accessing xmlnode internals 370 | xmlnode_replace_data(body, body_text, body_len); 371 | 372 | // free cpim data 373 | cpim_message_free(msg); 374 | // free url 375 | free(url); 376 | } 377 | 378 | gpg_data_free(text); 379 | } 380 | } 381 | 382 | g_free(data); 383 | } 384 | 385 | // continue processing 386 | return FALSE; 387 | } 388 | 389 | static gboolean 390 | jabber_presence_received(PurpleConnection *pc, const char *type, 391 | const char *from, xmlnode *presence) 392 | { 393 | if (from != NULL) { 394 | // store fingerprint regardless of presence type 395 | char* fingerprint = NULL; 396 | xmlnode *pubkey = xmlnode_get_child_with_namespace(presence, PUBKEY_ELEMENT, PUBKEY_NAMESPACE); 397 | if (pubkey != NULL) { 398 | xmlnode *fpr_node = xmlnode_get_child(pubkey, "print"); 399 | if (fpr_node != NULL) { 400 | fingerprint = xmlnode_get_data(fpr_node); 401 | if (fingerprint != NULL && *(g_strchomp(fingerprint)) != '\0') { 402 | purple_debug_misc(PACKAGE_NAME, "public key fingerprint for %s: %s\n", 403 | from, fingerprint); 404 | 405 | // retrieve buddy from name 406 | PurpleBuddy *buddy = purple_find_buddy(purple_connection_get_account(pc), from); 407 | if (buddy != NULL) { 408 | char* uid = NULL; 409 | 410 | // is the fingerprint changed? 411 | const char* old_fingerprint = purple_blist_node_get_string 412 | (&buddy->node, "fingerprint"); 413 | char* jid = jabber_get_bare_jid(from); 414 | 415 | // ...or maybe the key doesn't exist? 416 | if (g_strcmp0(old_fingerprint, fingerprint) || !(uid = gpg_get_userid(fingerprint, 0))) { 417 | // fingerprint changed or key not found, request key 418 | request_public_key(pc, jid); 419 | } 420 | else { 421 | // do we need to rename the user? 422 | rename_user_from_key(purple_connection_get_account(pc), jid, fingerprint); 423 | } 424 | 425 | g_free(jid); 426 | free(uid); 427 | 428 | // store fingerprint 429 | purple_blist_node_set_string(&buddy->node, "fingerprint", fingerprint); 430 | } 431 | else { 432 | purple_debug_warning(PACKAGE_NAME, "buddy %s not found!\n", from); 433 | } 434 | 435 | } 436 | 437 | g_free((gpointer) fingerprint); 438 | } 439 | } 440 | } 441 | 442 | // continue processing 443 | return FALSE; 444 | } 445 | 446 | static xmlnode * 447 | create_encryption_node(const char *cipher, size_t cipher_len) 448 | { 449 | xmlnode *node = xmlnode_new(E2E_ELEMENT); 450 | xmlnode_set_namespace(node, E2E_NAMESPACE); 451 | 452 | // encode data 453 | char *encoded = g_base64_encode((unsigned char *) cipher, cipher_len); 454 | if (encoded) { 455 | xmlnode_insert_data(node, encoded, -1); 456 | return node; 457 | } 458 | 459 | xmlnode_free(node); 460 | return NULL; 461 | } 462 | 463 | static const char * 464 | get_current_timestamp() 465 | { 466 | time_t ts = time(NULL); 467 | strftime(timestamp_buffer, TIMESTAMP_LEN, TIMESTAMP_FORMAT, gmtime(&ts)); 468 | return timestamp_buffer; 469 | } 470 | 471 | static gboolean 472 | jabber_xmlnode_sending(PurpleConnection *pc, xmlnode **packet) 473 | { 474 | xmlnode *body; 475 | char *cpim, *text; 476 | const char *to; 477 | char *cipher; 478 | const char *fingerprint = NULL; 479 | size_t cipher_len; 480 | 481 | // create CPIM message from body node 482 | if (!strcmp((*packet)->name, "message") && (body = xmlnode_get_child(*packet, "body")) != NULL) { 483 | to = xmlnode_get_attrib(*packet, "to"); 484 | 485 | // retrieve fingerprint for user 486 | PurpleBuddy *buddy = purple_find_buddy(pc->account, to); 487 | if (buddy != NULL) { 488 | // is the fingerprint changed? 489 | fingerprint = purple_blist_node_get_string 490 | (&buddy->node, "fingerprint"); 491 | 492 | if (fingerprint == NULL) { 493 | purple_debug_warning(PACKAGE_NAME, "buddy %s has no fingerprint!\n", to); 494 | return FALSE; 495 | } 496 | } 497 | else { 498 | purple_debug_warning(PACKAGE_NAME, "buddy %s not found!\n", to); 499 | return FALSE; 500 | } 501 | 502 | if (fingerprint != NULL) { 503 | text = xmlnode_get_data(body); 504 | 505 | const char *secret_key = purple_prefs_get_string(SECRET_KEY_PREF); 506 | 507 | char *sender = gpg_get_userid(secret_key, 1); 508 | char *recipient = gpg_get_userid(fingerprint, 0); 509 | if (sender == NULL) { 510 | purple_debug_error(PACKAGE_NAME, "unable to find secret key!\n"); 511 | free(text); 512 | return FALSE; 513 | } 514 | if (recipient == NULL) { 515 | purple_debug_warning(PACKAGE_NAME, "unable to find public key for %s!\n", to); 516 | free(text); 517 | return FALSE; 518 | } 519 | 520 | cpim = cpim_message_create_text(text, sender, recipient, get_current_timestamp()); 521 | free(text); 522 | free(sender); 523 | free(recipient); 524 | 525 | if (!gpg_encrypt(fingerprint, secret_key, cpim, strlen(cpim), &cipher, &cipher_len)) { 526 | xmlnode *child = create_encryption_node(cipher, cipher_len); 527 | gpg_data_free(cipher); 528 | 529 | if (child != NULL) { 530 | // replace body with a dummy 531 | // WARNING accessing xmlnode internals 532 | xmlnode_replace_data(body, _("(encrypted)"), -1); 533 | // add the encrypted part 534 | xmlnode_insert_child(*packet, child); 535 | } 536 | } 537 | 538 | g_free(cpim); 539 | } 540 | } 541 | 542 | // continue processing 543 | return FALSE; 544 | } 545 | 546 | static PurplePluginPrefFrame * 547 | pref_frame(PurplePlugin *plugin) 548 | { 549 | PurplePluginPref *pref; 550 | PurplePluginPrefFrame *frame = purple_plugin_pref_frame_new(); 551 | 552 | pref = purple_plugin_pref_new_with_name_and_label(SECRET_KEY_PREF, 553 | _("Secret key")); 554 | purple_plugin_pref_frame_add(frame, pref); 555 | 556 | pref = purple_plugin_pref_new_with_name_and_label(TUN_CERTIFICATE_PREF, 557 | _("Certificate file")); 558 | purple_plugin_pref_frame_add(frame, pref); 559 | 560 | pref = purple_plugin_pref_new_with_name_and_label(TUN_PRIVATE_KEY_PREF, 561 | _("Private key file")); 562 | purple_plugin_pref_frame_add(frame, pref); 563 | 564 | pref = purple_plugin_pref_new_with_name_and_label(TUN_PORT_PREF, 565 | _("Tunnel listen port")); 566 | purple_plugin_pref_set_bounds(pref, 0, 65536); 567 | purple_plugin_pref_frame_add(frame, pref); 568 | 569 | pref = purple_plugin_pref_new_with_name_and_label(TUN_RELAY_HOST_PREF, 570 | _("Server host")); 571 | purple_plugin_pref_frame_add(frame, pref); 572 | 573 | pref = purple_plugin_pref_new_with_name_and_label(TUN_RELAY_PORT_PREF, 574 | _("Server port")); 575 | purple_plugin_pref_set_bounds(pref, 0, 65536); 576 | purple_plugin_pref_frame_add(frame, pref); 577 | 578 | return frame; 579 | } 580 | 581 | static gboolean 582 | plugin_load(PurplePlugin *plugin) 583 | { 584 | // init gpgme 585 | if (!gpg_init()) { 586 | purple_notify_message(plugin, PURPLE_NOTIFY_MSG_ERROR, PACKAGE_TITLE, 587 | // TODO i18n 588 | "GPGME >= " GPGME_REQUIRED_VERSION " is required.", NULL, NULL, NULL); 589 | return FALSE; 590 | } 591 | 592 | void *jabber_handle = purple_plugins_find_with_id("prpl-jabber"); 593 | 594 | if (jabber_handle) { 595 | // init signals 596 | purple_signal_connect(jabber_handle, "jabber-receiving-presence", 597 | plugin, PURPLE_CALLBACK(jabber_presence_received), NULL); 598 | // TODO convert to jabber-register-namespace-watcher? 599 | purple_signal_connect(jabber_handle, "jabber-receiving-iq", 600 | plugin, PURPLE_CALLBACK(jabber_iq_received), NULL); 601 | purple_signal_connect(jabber_handle, "jabber-receiving-message", 602 | plugin, PURPLE_CALLBACK(jabber_message_received), NULL); 603 | purple_signal_connect(jabber_handle, "jabber-sending-xmlnode", 604 | plugin, PURPLE_CALLBACK(jabber_xmlnode_sending), NULL); 605 | 606 | purple_signal_connect(pidgin_blist_get_handle(), "drawing-tooltip", 607 | plugin, PURPLE_CALLBACK(append_to_tooltip), NULL); 608 | purple_signal_connect(purple_blist_get_handle(), "blist-node-extended-menu", 609 | plugin, PURPLE_CALLBACK(extended_menu_cb), NULL); 610 | 611 | const guint16 tun_port = purple_prefs_get_int(TUN_PORT_PREF); 612 | if (tun_port > 0 && tun_port <= 65536) { 613 | const gchar* relay_host = purple_prefs_get_string(TUN_RELAY_HOST_PREF); 614 | const guint16 relay_port = purple_prefs_get_int(TUN_RELAY_PORT_PREF); 615 | const gchar* certificate = purple_prefs_get_string(TUN_CERTIFICATE_PREF); 616 | const gchar* private_key = purple_prefs_get_string(TUN_PRIVATE_KEY_PREF); 617 | if ((certificate != NULL && strlen(certificate) == 0) || 618 | (private_key != NULL && strlen(private_key) == 0)) { 619 | certificate = private_key = NULL; 620 | } 621 | 622 | // TODO we should use SRV discovery and host/port as fallback 623 | // TODO extract service name from account (host property) 624 | TunnelError tun_err = tunnel_start(tun_port, relay_host, relay_host, relay_port, 625 | certificate, private_key); 626 | if (tun_err == TUN_ERR_LISTEN) { 627 | purple_notify_message(plugin, PURPLE_NOTIFY_MSG_WARNING, PACKAGE_TITLE, 628 | _("Unable to create tunnel service. Is the configured port already used?"), NULL, NULL, NULL); 629 | } 630 | else if (tun_err == TUN_ERR_CERTIFICATE) { 631 | purple_notify_message(plugin, PURPLE_NOTIFY_MSG_WARNING, PACKAGE_TITLE, 632 | _("Unable to load certificate for Kontalk."), NULL, NULL, NULL); 633 | } 634 | } 635 | 636 | return TRUE; 637 | } 638 | 639 | return FALSE; 640 | } 641 | 642 | static gboolean 643 | plugin_unload(PurplePlugin *plugin) 644 | { 645 | purple_signals_disconnect_by_handle(plugin); 646 | gpg_free(); 647 | tunnel_stop(); 648 | 649 | return TRUE; 650 | } 651 | 652 | static PurplePluginUiInfo prefs_info = { 653 | pref_frame, 654 | 0, 655 | NULL, 656 | NULL, 657 | NULL, 658 | NULL, 659 | NULL 660 | }; 661 | 662 | static PurplePluginInfo info = { 663 | PURPLE_PLUGIN_MAGIC, 664 | PURPLE_MAJOR_VERSION, 665 | PURPLE_MINOR_VERSION, 666 | PURPLE_PLUGIN_STANDARD, 667 | PIDGIN_PLUGIN_TYPE, 668 | 0, 669 | NULL, 670 | PURPLE_PRIORITY_DEFAULT, 671 | 672 | PLUGIN_ID, 673 | NULL, 674 | PACKAGE_VERSION, 675 | 676 | NULL, 677 | NULL, 678 | PLUGIN_AUTHOR, 679 | PLUGIN_WEBSITE, 680 | 681 | plugin_load, 682 | plugin_unload, 683 | NULL, 684 | 685 | NULL, 686 | NULL, 687 | &prefs_info, 688 | NULL, 689 | NULL, 690 | NULL, 691 | NULL, 692 | NULL 693 | }; 694 | 695 | static void 696 | init_plugin(PurplePlugin *plugin) 697 | { 698 | #ifdef ENABLE_NLS 699 | bindtextdomain(GETTEXT_PACKAGE, LOCALEDIR); 700 | bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8"); 701 | #endif /* ENABLE_NLS */ 702 | 703 | info.name = _("Kontalk integration"); 704 | info.summary = _("Provides support for features used by a Kontalk server."); 705 | info.description = _("Provides support for encryption, key management, media exchange," 706 | " registration and authentication for a Kontalk server"); 707 | 708 | purple_prefs_add_none("/plugins"); 709 | purple_prefs_add_none("/plugins/gtk"); 710 | purple_prefs_add_none("/plugins/gtk/" PACKAGE_NAME); 711 | 712 | purple_prefs_add_string(SECRET_KEY_PREF, ""); 713 | // TODO until a checkbox is implemented, make this zero to disable internal tunnel 714 | purple_prefs_add_int(TUN_PORT_PREF, 0 /*DEFAULT_TUNNEL_PORT*/); 715 | purple_prefs_add_string(TUN_RELAY_HOST_PREF, DEFAULT_RELAY_HOST); 716 | purple_prefs_add_int(TUN_RELAY_PORT_PREF, DEFAULT_RELAY_PORT); 717 | purple_prefs_add_string(TUN_CERTIFICATE_PREF, ""); 718 | purple_prefs_add_string(TUN_PRIVATE_KEY_PREF, ""); 719 | } 720 | 721 | PURPLE_INIT_PLUGIN(kontalk, init_plugin, info) 722 | -------------------------------------------------------------------------------- /pidgin/kontalk.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #ifndef _KONTALK_H_ 20 | #define _KONTALK_H_ 21 | 22 | // this is not translatable 23 | #define PACKAGE_TITLE "Kontalk" 24 | 25 | #define PLUGIN_ID "gtk-" PACKAGE_NAME 26 | #define PLUGIN_AUTHOR "Kontalk devteam " 27 | #define PLUGIN_WEBSITE "http://www.kontalk.org/" 28 | 29 | #define PUBKEY_ELEMENT "pubkey" 30 | #define PUBKEY_NAMESPACE "urn:xmpp:pubkey:2" 31 | 32 | #define DEFAULT_TUNNEL_PORT 5224 33 | #define DEFAULT_RELAY_HOST "beta.kontalk.net" 34 | #define DEFAULT_RELAY_PORT 5222 35 | 36 | #define E2E_ELEMENT "e2e" 37 | #define E2E_NAMESPACE "urn:ietf:params:xml:ns:xmpp-e2e" 38 | 39 | #define XMPP_CONTENT_TYPE "application/xmpp+xml" 40 | #define XMPP_ELEMENT "xmpp" 41 | #define XMPP_NAMESPACE "jabber:client" 42 | 43 | #endif /* _KONTALK_H_ */ 44 | -------------------------------------------------------------------------------- /pidgin/tunnel.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #include "tunnel.h" 20 | 21 | #include 22 | #include 23 | #include 24 | 25 | // data key in client connection for getting the connection to the server 26 | #define DATA_RELAY "connection_relay" 27 | // data key in server (relay) connection for getting the connection to the client 28 | #define DATA_CLIENT "connection_client" 29 | // data key in server (relay) connection for the TLS connection 30 | #define DATA_TLS "connection_tls" 31 | // data key for input buffer 32 | #define DATA_BUFFER_IN "buffer_in" 33 | // data key for output buffer (temporary - will be destroyed when operation is finished) 34 | #define DATA_BUFFER_OUT "buffer_out" 35 | 36 | #define BUF_LEN 8192 37 | 38 | #define TEXT_INIT "" 39 | #define TEXT_STARTTLS "" 40 | #define TEXT_SSL_REPLY1 "" 41 | #define TEXT_SSL_REPLY2 "" 42 | #define TEXT_MECH_EXT "EXTERNAL" 43 | #define TEXT_MECH_PLAIN "PLAIN" 44 | #define TEXT_PLAIN "PLAIN" 45 | #define TEXT_EXTERNAL "EXTERNAL" 46 | #define REGEX_AUTH "(.*)$" 47 | 48 | static GSocketService *main_service = NULL; 49 | static gchar *relay_service_name = NULL; 50 | static gchar *relay_server_host = NULL; 51 | static guint16 relay_server_port; 52 | static GTlsCertificate *user_certificate = NULL; 53 | static GSocketClient *relay_client = NULL; 54 | // compiled at first usage 55 | static GRegex *auth_regex = NULL; 56 | 57 | // https://ubuntuforums.org/showthread.php?t=1309881&p=8216359#post8216359 58 | // adapted for GLib 59 | static gchar * 60 | str_replace(const gchar *orig_str, const gchar *old_token, const gchar *new_token) 61 | { 62 | gchar *new_str = NULL; 63 | const gchar* pos = strstr(orig_str, old_token); 64 | 65 | if (pos) { 66 | new_str = g_malloc0(strlen(orig_str) - strlen(old_token) + strlen(new_token) + 1); 67 | 68 | strncpy(new_str, orig_str, pos - orig_str); 69 | strcat(new_str, new_token); 70 | strcat(new_str, pos + strlen(old_token)); 71 | } 72 | 73 | return new_str; 74 | } 75 | 76 | static gboolean 77 | regex_match(const gchar *buf, gsize len, const gchar *regex) 78 | { 79 | if (auth_regex == NULL) { 80 | GError *err = NULL; 81 | auth_regex = g_regex_new(REGEX_AUTH, 0, 0, &err); 82 | if (err != NULL) { 83 | purple_debug_warning(PACKAGE_NAME, "error compiling regex: %s\n", 84 | err->message); 85 | g_error_free(err); 86 | return FALSE; 87 | } 88 | } 89 | 90 | GError *err = NULL; 91 | GMatchInfo *match = NULL; 92 | gboolean ret = g_regex_match_full(auth_regex, buf, len, 0, 0, &match, &err); 93 | 94 | if (err != NULL) { 95 | purple_debug_warning(PACKAGE_NAME, "error matching regex: %s\n", 96 | err->message); 97 | g_error_free(err); 98 | return FALSE; 99 | } 100 | if (match != NULL) { 101 | g_match_info_free(match); 102 | } 103 | 104 | return ret; 105 | } 106 | 107 | static void 108 | relay_read_cb(GInputStream *relay_in, GAsyncResult *res, GSocketConnection *relay_conn); 109 | 110 | static void 111 | close_stream(void *stream) 112 | { 113 | g_io_stream_close(G_IO_STREAM(stream), NULL, NULL); 114 | g_object_unref(G_OBJECT(stream)); 115 | } 116 | 117 | static void 118 | stream_write_async(GIOStream *conn, gchar *buf, gsize len, GAsyncReadyCallback callback, gpointer user_data) 119 | { 120 | GOutputStream *out = g_io_stream_get_output_stream(conn); 121 | g_assert(out != NULL); 122 | 123 | g_object_set_data(G_OBJECT(out), DATA_BUFFER_OUT, buf); 124 | g_output_stream_write_all_async(out, buf, len, 125 | G_PRIORITY_DEFAULT, NULL, callback, 126 | user_data != NULL ? user_data : conn); 127 | } 128 | 129 | static void 130 | client_event(GSocketClient *client, GSocketClientEvent event, GSocketConnectable *connectable, 131 | GIOStream *connection, gpointer user_data) 132 | { 133 | // TODO 134 | purple_debug_misc(PACKAGE_NAME, "relay connection event: %d\n", event); 135 | } 136 | 137 | static void 138 | relay_write_cb(GOutputStream *relay_out, GAsyncResult *res, GSocketConnection *relay_conn) 139 | { 140 | // sent data can be destroyed now 141 | gchar *buf = g_object_get_data(G_OBJECT(relay_out), DATA_BUFFER_OUT); 142 | g_free(buf); 143 | 144 | GError *err = NULL; 145 | if (!g_output_stream_write_all_finish(relay_out, res, NULL, &err)) { 146 | purple_debug_warning(PACKAGE_NAME, "error writing to server: %s\n", 147 | err->message); 148 | g_error_free(err); 149 | 150 | // disconnect client 151 | GSocketConnection *client_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_CLIENT); 152 | if (client_conn != NULL) 153 | close_stream(client_conn); 154 | 155 | // disconnect server 156 | close_stream(relay_conn); 157 | } 158 | } 159 | 160 | static void 161 | client_read_cb(GInputStream *client_in, GAsyncResult *res, GSocketConnection *client_conn) 162 | { 163 | GSocketConnection *relay_conn = g_object_get_data(G_OBJECT(client_conn), DATA_RELAY); 164 | if (relay_conn == NULL) { 165 | // object has been destroyed 166 | return; 167 | } 168 | 169 | GError *err = NULL; 170 | gssize buf_len = g_input_stream_read_finish(client_in, res, &err); 171 | 172 | // error 173 | if (buf_len < 0) { 174 | purple_debug_warning(PACKAGE_NAME, "error reading from client: %s\n", 175 | err->message); 176 | g_error_free(err); 177 | // disconnect both sides 178 | close_stream(relay_conn); 179 | close_stream(client_conn); 180 | } 181 | // connection closed from client 182 | else if (buf_len == 0) { 183 | purple_debug_info(PACKAGE_NAME, "connection from client closed.\n"); 184 | // disconnect server 185 | close_stream(relay_conn); 186 | } 187 | else { 188 | gchar *buf = g_object_get_data(G_OBJECT(client_conn), DATA_BUFFER_IN); 189 | if (buf != NULL) { 190 | #ifdef DEBUG 191 | purple_debug_misc(PACKAGE_NAME, "client: \"%.*s\"\n", (int) buf_len, buf); 192 | #endif 193 | 194 | // forward data to server 195 | GIOStream *tls_relay_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_TLS); 196 | g_assert(tls_relay_conn != NULL); 197 | 198 | gchar *out; 199 | 200 | // check for PLAIN auth and replace it with EXTERNAL to fool the server 201 | if (regex_match(buf, buf_len, REGEX_AUTH)) { 202 | // replace PLAIN with EXTERNAL 203 | // we are doing string operation so it's better to stringify the buffer 204 | // TODO this could be avoided by modifying str_replace to accept length 205 | out = g_memdup(buf, buf_len); 206 | gchar *buf_str = g_strndup(buf, buf_len); 207 | gchar *buf_fixed = str_replace(buf_str, TEXT_PLAIN, TEXT_EXTERNAL); 208 | g_free(buf_str); 209 | 210 | out = buf_fixed; 211 | buf_len = strlen(buf_fixed); 212 | } 213 | else { 214 | out = g_memdup(buf, buf_len); 215 | } 216 | 217 | stream_write_async(G_IO_STREAM(tls_relay_conn), out, buf_len, (GAsyncReadyCallback) relay_write_cb, relay_conn); 218 | 219 | // read again 220 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(client_conn)), 221 | buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) client_read_cb, client_conn); 222 | } 223 | } 224 | } 225 | 226 | static void 227 | relay_tls_handshake_cb(GTlsClientConnection *tls_relay_conn, GAsyncResult *res, GSocketConnection *relay_conn) 228 | { 229 | GSocketConnection *client_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_CLIENT); 230 | 231 | GError *err = NULL; 232 | if (!g_tls_connection_handshake_finish(G_TLS_CONNECTION(tls_relay_conn), res, &err)) { 233 | purple_debug_warning(PACKAGE_NAME, "error handshaking TLS with server: %s\n", 234 | err->message); 235 | g_error_free(err); 236 | 237 | // disconnect client 238 | if (client_conn != NULL) 239 | close_stream(client_conn); 240 | 241 | // disconnect server 242 | close_stream(relay_conn); 243 | 244 | return; 245 | } 246 | 247 | purple_debug_misc(PACKAGE_NAME, "TLS handshake with server completed.\n"); 248 | 249 | // we got TLS from the relay server 250 | // now we need to flush out data from the client 251 | // so start reading from the client socket (i.e. from Pidgin) 252 | void *client_buf = g_malloc0(BUF_LEN); 253 | // this will release the buffer on object destruction 254 | g_object_set_data_full(G_OBJECT(client_conn), DATA_BUFFER_IN, client_buf, g_free); 255 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(client_conn)), 256 | client_buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) client_read_cb, client_conn); 257 | 258 | // also resume reading from the server 259 | void *relay_buf = g_object_get_data(G_OBJECT(relay_conn), DATA_BUFFER_IN); 260 | g_assert(relay_buf != NULL); 261 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(tls_relay_conn)), 262 | relay_buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) relay_read_cb, relay_conn); 263 | } 264 | 265 | static void 266 | start_tls(GSocketConnection *relay_conn) 267 | { 268 | // TODO server identity? 269 | GTlsClientConnection *tls_relay_conn = G_TLS_CLIENT_CONNECTION 270 | (g_tls_client_connection_new(G_IO_STREAM(relay_conn), NULL, NULL)); 271 | g_assert(tls_relay_conn != NULL); 272 | 273 | // load client certificate 274 | g_tls_connection_set_certificate(G_TLS_CONNECTION(tls_relay_conn), 275 | user_certificate); 276 | 277 | // store our TLS connection object 278 | g_object_set_data(G_OBJECT(relay_conn), DATA_TLS, tls_relay_conn); 279 | 280 | // start the handshake 281 | g_tls_client_connection_set_validation_flags(tls_relay_conn, 282 | G_TLS_CERTIFICATE_UNKNOWN_CA); 283 | g_tls_connection_handshake_async(G_TLS_CONNECTION(tls_relay_conn), 284 | G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) relay_tls_handshake_cb, relay_conn); 285 | } 286 | 287 | static void 288 | client_write_cb(GOutputStream *client_out, GAsyncResult *res, GSocketConnection *client_conn) 289 | { 290 | // sent data can be destroyed now 291 | gchar *buf = g_object_get_data(G_OBJECT(client_out), DATA_BUFFER_OUT); 292 | g_free(buf); 293 | 294 | GError *err = NULL; 295 | if (!g_output_stream_write_all_finish(client_out, res, NULL, &err)) { 296 | purple_debug_warning(PACKAGE_NAME, "error writing to client: %s\n", 297 | err->message); 298 | g_error_free(err); 299 | 300 | // disconnect server 301 | GSocketConnection *relay_conn = g_object_get_data(G_OBJECT(client_conn), DATA_RELAY); 302 | if (relay_conn != NULL) 303 | close_stream(relay_conn); 304 | 305 | // disconnect client 306 | close_stream(client_conn); 307 | } 308 | } 309 | 310 | static void 311 | relay_read_cb(GInputStream *relay_in, GAsyncResult *res, GSocketConnection *relay_conn) 312 | { 313 | GSocketConnection *client_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_CLIENT); 314 | if (client_conn == NULL) { 315 | // object has been destroyed 316 | return; 317 | } 318 | 319 | GError *err = NULL; 320 | gssize buf_len = g_input_stream_read_finish(relay_in, res, &err); 321 | 322 | // error 323 | if (buf_len < 0) { 324 | purple_debug_warning(PACKAGE_NAME, "error reading from relay server: %s\n", 325 | err->message); 326 | g_error_free(err); 327 | // disconnect both sides 328 | close_stream(relay_conn); 329 | close_stream(client_conn); 330 | } 331 | // connection closed from server 332 | else if (buf_len == 0) { 333 | purple_debug_info(PACKAGE_NAME, "connection from server closed.\n"); 334 | // disconnect client 335 | close_stream(client_conn); 336 | } 337 | else { 338 | gchar *buf = g_object_get_data(G_OBJECT(relay_conn), DATA_BUFFER_IN); 339 | if (buf != NULL) { 340 | #ifdef DEBUG 341 | purple_debug_misc(PACKAGE_NAME, "server: \"%.*s\"\n", (int) buf_len, buf); 342 | #endif 343 | 344 | GTlsClientConnection *tls_relay_conn = g_object_get_data 345 | (G_OBJECT(relay_conn), DATA_TLS); 346 | 347 | // in relay mode 348 | if (tls_relay_conn != NULL) { 349 | gchar *out; 350 | 351 | // check for EXTERNAL mechanism and replace it with PLAIN to fool Pidgin 352 | if (memmem(buf, buf_len, TEXT_MECH_EXT, strlen(TEXT_MECH_EXT))) { 353 | // replace EXTERNAL with PLAIN 354 | // we are doing string operation so it's better to stringify the buffer 355 | // TODO this could be avoided by modifying str_replace to accept length 356 | gchar *buf_str = g_strndup(buf, buf_len); 357 | gchar *buf_fixed = str_replace(buf_str, TEXT_MECH_EXT, TEXT_MECH_PLAIN); 358 | g_free(buf_str); 359 | 360 | out = buf_fixed; 361 | buf_len = strlen(buf_fixed); 362 | } 363 | else { 364 | out = g_memdup(buf, buf_len); 365 | } 366 | 367 | // forward data to client 368 | stream_write_async(G_IO_STREAM(client_conn), out, buf_len, 369 | (GAsyncReadyCallback) client_write_cb, NULL); 370 | 371 | // read again 372 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(tls_relay_conn)), 373 | buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) relay_read_cb, relay_conn); 374 | 375 | } 376 | // in autonomous mode 377 | else { 378 | // check for starttls proceed command and start TLS against the relay server 379 | if (memmem(buf, buf_len, TEXT_SSL_REPLY1, strlen(TEXT_SSL_REPLY1)) || 380 | memmem(buf, buf_len, TEXT_SSL_REPLY1, strlen(TEXT_SSL_REPLY2))) { 381 | start_tls(relay_conn); 382 | } 383 | else { 384 | // read again 385 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(relay_conn)), 386 | buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) relay_read_cb, relay_conn); 387 | } 388 | } 389 | } 390 | } 391 | } 392 | 393 | static void 394 | relay_write_starttls_cb(GOutputStream *relay_out, GAsyncResult *res, GSocketConnection *relay_conn) 395 | { 396 | // data is static, no need to free 397 | 398 | GError *err = NULL; 399 | if (!g_output_stream_write_all_finish(relay_out, res, NULL, &err)) { 400 | purple_debug_warning(PACKAGE_NAME, "error writing to server: %s\n", 401 | err->message); 402 | g_error_free(err); 403 | 404 | // disconnect client 405 | GSocketConnection *client_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_CLIENT); 406 | if (client_conn != NULL) 407 | close_stream(client_conn); 408 | 409 | // disconnect server 410 | close_stream(relay_conn); 411 | } 412 | 413 | // reading part will catch the "proceed" and start TLS handshake 414 | } 415 | 416 | static void 417 | relay_write_init_cb(GOutputStream *relay_out, GAsyncResult *res, GSocketConnection *relay_conn) 418 | { 419 | // sent data can be destroyed now 420 | gchar *buf = g_object_get_data(G_OBJECT(relay_out), DATA_BUFFER_OUT); 421 | g_free(buf); 422 | 423 | GError *err = NULL; 424 | if (!g_output_stream_write_all_finish(relay_out, res, NULL, &err)) { 425 | purple_debug_warning(PACKAGE_NAME, "error writing to server: %s\n", 426 | err->message); 427 | g_error_free(err); 428 | 429 | // disconnect client 430 | GSocketConnection *client_conn = g_object_get_data(G_OBJECT(relay_conn), DATA_CLIENT); 431 | if (client_conn != NULL) 432 | close_stream(client_conn); 433 | 434 | // disconnect server 435 | close_stream(relay_conn); 436 | return; 437 | } 438 | 439 | // request starttls 440 | stream_write_async(G_IO_STREAM(relay_conn), TEXT_STARTTLS, strlen(TEXT_STARTTLS), 441 | (GAsyncReadyCallback) relay_write_starttls_cb, NULL); 442 | } 443 | 444 | /** 445 | * Callback for relay server connection event. 446 | * @param connection the connection from Pidgin 447 | */ 448 | static void 449 | relay_connected_cb(GSocketClient *client, GAsyncResult *res, GSocketConnection *client_conn) 450 | { 451 | GError *err = NULL; 452 | GSocketConnection *relay_conn = g_socket_client_connect_to_host_finish(client, res, &err); 453 | if (relay_conn == NULL) { 454 | purple_debug_warning(PACKAGE_NAME, "unable to connect to relay server: %s\n", 455 | err->message); 456 | g_error_free(err); 457 | 458 | // close connection from Pidgin 459 | close_stream(client_conn); 460 | return; 461 | } 462 | 463 | // store a cross-reference to the each other 464 | g_object_set_data(G_OBJECT(client_conn), DATA_RELAY, relay_conn); 465 | g_object_set_data(G_OBJECT(relay_conn), DATA_CLIENT, client_conn); 466 | 467 | // start reading from relay connection (connection to server) 468 | void *relay_buf = g_malloc0(BUF_LEN); 469 | // this will release the buffer on object destruction 470 | g_object_set_data_full(G_OBJECT(relay_conn), DATA_BUFFER_IN, relay_buf, g_free); 471 | g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(relay_conn)), 472 | relay_buf, BUF_LEN, G_PRIORITY_DEFAULT, NULL, (GAsyncReadyCallback) relay_read_cb, relay_conn); 473 | 474 | // begin communication with server 475 | gchar *init_out = g_strdup_printf(TEXT_INIT, relay_service_name); 476 | stream_write_async(G_IO_STREAM(relay_conn), init_out, strlen(init_out), 477 | (GAsyncReadyCallback) relay_write_init_cb, NULL); 478 | } 479 | 480 | static gboolean 481 | connect_to_relay_server(GSocketConnection *connection) 482 | { 483 | g_socket_client_connect_to_host_async(relay_client, relay_server_host, relay_server_port, 484 | NULL, (GAsyncReadyCallback) relay_connected_cb, connection); 485 | return TRUE; 486 | } 487 | 488 | static gboolean 489 | socket_incoming(GSocketService *service, GSocketConnection *connection, GObject *source_object, gpointer user_data) 490 | { 491 | GSocketAddress *addr = g_socket_connection_get_remote_address(connection, NULL); 492 | g_assert(addr != NULL); 493 | 494 | gchar *addr_str = g_socket_connectable_to_string(G_SOCKET_CONNECTABLE(addr)); 495 | purple_debug_info(PACKAGE_NAME, "incoming connection from %s\n", addr_str); 496 | g_free(addr_str); 497 | 498 | // we intend to use our connection object 499 | g_object_ref(connection); 500 | 501 | // connect to the relay server and go on 502 | connect_to_relay_server(connection); 503 | return TRUE; 504 | } 505 | 506 | static gboolean 507 | load_client_certificate(const gchar *cert_file, const gchar *key_file, GError **error) 508 | { 509 | user_certificate = g_tls_certificate_new_from_files(cert_file, key_file, error); 510 | return user_certificate != NULL; 511 | } 512 | 513 | TunnelError 514 | tunnel_start(guint16 listen_port, const gchar *service_name, 515 | const gchar *server_host, guint16 server_port, 516 | const gchar* cert_file, const gchar *key_file) 517 | { 518 | if (cert_file == NULL || key_file == NULL) { 519 | // configuration error 520 | return TUN_ERR_CONFIG; 521 | } 522 | 523 | GError *err = NULL; 524 | 525 | // load certificate 526 | if (!load_client_certificate(cert_file, key_file, &err)) { 527 | purple_debug_warning(PACKAGE_NAME, "unable to load client certificate: %s\n", 528 | err->message); 529 | g_error_free(err); 530 | return TUN_ERR_CERTIFICATE; 531 | } 532 | 533 | main_service = g_socket_service_new(); 534 | g_assert(main_service != NULL); 535 | relay_client = g_socket_client_new(); 536 | g_assert(relay_client != NULL); 537 | // client event handler is global so connect it now 538 | g_signal_connect(G_OBJECT(relay_client), "event", G_CALLBACK(client_event), NULL); 539 | 540 | if (!g_socket_listener_add_inet_port(G_SOCKET_LISTENER(main_service), listen_port, NULL, &err)) { 541 | purple_debug_warning(PACKAGE_NAME, "unable to listen on port %d: %s\n", 542 | listen_port, err->message); 543 | g_error_free(err); 544 | return TUN_ERR_LISTEN; 545 | } 546 | 547 | g_signal_connect(G_OBJECT(main_service), "incoming", G_CALLBACK(socket_incoming), NULL); 548 | relay_service_name = g_strdup(service_name); 549 | relay_server_host = g_strdup(server_host); 550 | relay_server_port = server_port; 551 | return TUN_ERR_OK; 552 | } 553 | 554 | void 555 | tunnel_stop() 556 | { 557 | if (main_service != NULL) { 558 | g_socket_service_stop(main_service); 559 | g_socket_listener_close(G_SOCKET_LISTENER(main_service)); 560 | g_object_unref(main_service); 561 | g_object_unref(relay_client); 562 | g_free(relay_server_host); 563 | relay_server_host = NULL; 564 | g_free(relay_service_name); 565 | relay_service_name = NULL; 566 | main_service = NULL; 567 | } 568 | } 569 | -------------------------------------------------------------------------------- /pidgin/tunnel.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Kontalk Pidgin plugin 3 | * Copyright (C) 2017 Kontalk Devteam 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #ifndef _TUNNEL_H_ 20 | #define _TUNNEL_H_ 21 | 22 | #include 23 | 24 | typedef enum { 25 | TUN_ERR_OK = 0, 26 | TUN_ERR_LISTEN, 27 | TUN_ERR_CERTIFICATE, 28 | TUN_ERR_CONFIG, 29 | } TunnelError; 30 | 31 | TunnelError 32 | tunnel_start(guint16 listen_port, const gchar *service_name, 33 | const gchar *server_host, guint16 server_port, 34 | const gchar* cert_file, const gchar *key_file); 35 | 36 | 37 | void tunnel_stop(); 38 | 39 | #endif /* _TUNNEL_H_ */ 40 | -------------------------------------------------------------------------------- /tunnel/README.md: -------------------------------------------------------------------------------- 1 | Generic SSL tunnel bridge 2 | ========================= 3 | 4 | This script can be used with any standard XMPP client. 5 | It creates a listening socket (defaults on port 5224) which clients can 6 | connect to. 7 | 8 | To use this script, you need to export your personal key from the Android 9 | app. You will find a zip file called `kontalk-keys.zip` in your external 10 | storage. You need these two files: 11 | 12 | * `kontalk-login.crt` 13 | * `kontalk-login.key` 14 | 15 | 16 | ## Installation 17 | 18 | You can install the script in any directory you like. 19 | You will need: 20 | 21 | * Python >= 2.7 22 | * [Twisted](http://twistedmatrix.com/) >= 13.x 23 | 24 | 25 | ## Usage 26 | 27 | This scripts will listen on a port that your preferred XMPP client will connect 28 | to. Here is an example command line: 29 | 30 | ``` 31 | ./ssl_bridge.py -d \ 32 | --domain beta.kontalk.net \ 33 | -c kontalk-login.crt \ 34 | -k kontalk-login.key \ 35 | beta.kontalk.net:5222 36 | ``` 37 | 38 | The script will listen on the default port 5224 for connections and create a 39 | bridge to `beta.kontalk.net` on port 5222, doing the SSL handshake for you. 40 | Setup your XMPP client to make an **unencrypted connection and to use plain 41 | authentication** (credentials don't matter, they will be discarded by the script, 42 | however you will need to use the domain you passed to `--domain`). 43 | The `-p` parameter is optional and indicates the port it will listen for 44 | incoming connections. 45 | The `-d` parameter is also optional and instructs the script to print debugging 46 | information along with a complete dump of the XMPP traffic between client and 47 | server. 48 | 49 | For more information, please refer to the built-in guide by running: 50 | 51 | ``` 52 | ./ssl_bridge.py -h 53 | ``` 54 | -------------------------------------------------------------------------------- /tunnel/ssl_bridge.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | # SSL bridge for XMPP STARTTLS 3 | # This code is in the public domain 4 | 5 | import argparse 6 | import re 7 | 8 | from twisted.internet.protocol import Protocol, Factory 9 | from twisted.internet.endpoints import TCP4ClientEndpoint, connectProtocol 10 | from twisted.internet import ssl, reactor, error 11 | 12 | 13 | PORT = 5222 14 | LISTEN_PORT = 5224 15 | 16 | 17 | class XMPPClient(Protocol): 18 | debug = False 19 | INIT = '' 20 | SSL_INIT = '' 21 | SSL_REPLY = re.compile("$") 22 | SASL_MECHS = re.compile("EXTERNALKONTALK-TOKEN") 23 | SASL_EXTERNAL = re.compile("EXTERNAL") 24 | 25 | def __init__(self, client, domain, cert_file, pkey_file): 26 | self.client = client 27 | self.domain = domain 28 | self.cert_file = cert_file 29 | self.pkey_file = pkey_file 30 | self._buf = '' 31 | 32 | def write(self, data): 33 | """Writes data to the XMPP server.""" 34 | if self.transport and self.transport.TLS: 35 | if self.debug: 36 | print 'SEND: %s' % (data, ) 37 | self.transport.write(data) 38 | else: 39 | self._buf += data 40 | 41 | def connectionMade(self): 42 | """Connected to XMPP server.""" 43 | init = self.INIT % self.domain 44 | if self.debug: 45 | print 'SEND: %s' % (init, ) 46 | self.transport.write(init) 47 | reactor.callLater(0.5, self._init2) 48 | 49 | def _init2(self): 50 | self.transport.write(self.SSL_INIT) 51 | 52 | def dataReceived(self, data): 53 | if self.debug: 54 | print 'RECV: %s' % (data, ) 55 | if self.SASL_MECHS.search(data): 56 | if self.debug: 57 | print 'filtering SASL mechanisms' 58 | data = self.SASL_MECHS.sub('', data) 59 | elif self.SASL_EXTERNAL.search(data): 60 | if self.debug: 61 | print 'filtering SASL mechanisms' 62 | data = self.SASL_EXTERNAL.sub('PLAIN', data) 63 | 64 | if self.transport.TLS: 65 | self.client.transport.write(data) 66 | elif self.SSL_REPLY.search(data): 67 | if self.debug: 68 | print 'starting TLS' 69 | 70 | with open(self.pkey_file) as keyFile: 71 | with open(self.cert_file) as certFile: 72 | clientCert = ssl.PrivateCertificate.loadPEM( 73 | keyFile.read() + certFile.read()) 74 | 75 | ctx = clientCert.options() 76 | self.transport.startTLS(ctx) 77 | if self._buf: 78 | if self.debug: 79 | print 'SEND: %s' % (self._buf, ) 80 | self.transport.write(self._buf) 81 | self._buf = None 82 | 83 | 84 | class BridgeProtocol(Protocol): 85 | debug = False 86 | AUTH_INIT = re.compile("(.*)$") 87 | 88 | def __init__(self, addr, domain, host, port, cert_file, pkey_file): 89 | self.addr = addr 90 | self.domain = domain 91 | self.host = host 92 | self.port = port 93 | self.cert_file = cert_file 94 | self.pkey_file = pkey_file 95 | self._endpoint = None 96 | self._buf = '' 97 | 98 | def _connected(self, p): 99 | self._endpoint = None 100 | 101 | def _error(self, fail=None): 102 | self.connectionLost(fail) 103 | 104 | def dataReceived(self, data): 105 | if self.AUTH_INIT.search(data): 106 | data = data.replace('PLAIN', 'EXTERNAL') 107 | 108 | self.client.write(data) 109 | if '' in data: 110 | if self.client.transport: 111 | self.client.transport.loseConnection() 112 | self.transport.loseConnection() 113 | 114 | def connectionMade(self): 115 | if self.debug: 116 | print 'got connection from %s' % (self.addr, ) 117 | print 'connecting to %s:%d' % (self.host, self.port) 118 | point = TCP4ClientEndpoint(reactor, self.host, self.port) 119 | self.client = XMPPClient(self, self.domain, self.cert_file, self.pkey_file) 120 | d = connectProtocol(point, self.client) 121 | d.addCallback(self._connected) 122 | d.addErrback(self._error) 123 | self._endpoint = d 124 | 125 | def connectionLost(self, reason=error.ConnectionDone): 126 | if not isinstance(reason, error.ConnectionDone): 127 | print 'lost connection from %s (%s)' % (self.addr, reason) 128 | if self.client.transport: 129 | self.client.transport.loseConnection() 130 | if self._endpoint: 131 | self._endpoint.cancel() 132 | self._endpoint = None 133 | 134 | 135 | class BridgeFactory(Factory): 136 | debug = False 137 | 138 | def __init__(self, domain, host, port, cert_file, pkey_file): 139 | self.domain = domain 140 | self.host = host 141 | self.port = port 142 | self.cert_file = cert_file 143 | self.pkey_file = pkey_file 144 | 145 | def buildProtocol(self, addr): 146 | return BridgeProtocol(addr, self.domain, self.host, self.port, 147 | self.cert_file, self.pkey_file) 148 | 149 | 150 | if __name__ == '__main__': 151 | 152 | parser = argparse.ArgumentParser(description='An XMPP bridge for clients not supporting SSL client certificate authentication.') 153 | parser.add_argument('-d', '--debug', help='enable debug output', action='store_true') 154 | parser.add_argument('-p', '--port', help='listen for local connections on this port (default: %d)' % LISTEN_PORT, default=LISTEN_PORT) 155 | parser.add_argument('--domain', help='use this domain for stream initialization', required=True) 156 | parser.add_argument('-c', '--certificate', help='X.509 certificate file', required=True) 157 | parser.add_argument('-k', '--privatekey', help='X.509 private key file', required=True) 158 | parser.add_argument('address', help='forward connections to this host (host:port)') 159 | 160 | args = parser.parse_args() 161 | 162 | if ':' in args.address: 163 | host, port = args.address.split(':') 164 | port = int(port) 165 | else: 166 | host, port = args.address, PORT 167 | 168 | BridgeFactory.debug = BridgeProtocol.debug = XMPPClient.debug = args.debug 169 | 170 | print 'listening on port %d, forwarding to %s:%d' % (int(args.port), host, port) 171 | reactor.listenTCP(int(args.port), BridgeFactory(args.domain, host, port, args.certificate, args.privatekey)) 172 | reactor.run() 173 | --------------------------------------------------------------------------------